Sample records for chloroprene

  1. Popcorn polymerisation of chloroprene. A kinetic investigation

    The project was sponsored by Du Font Dow Elastomers Ltd (Maydown, N. Ireland), in whose neoprene plant the popcorn polymers are found. The material itself has no commercial value, but grows rapidly and has the ability to block pipes and halt production. Therefore the production equipment containing monomers is all scheduled for 'popcorn search' inspections at intervals that differ according to the prevailing temperatures and monomer concentrations; a process which adds to costs. Prior work within the Queen's University of Belfast has identified the factors which affect the initiation of chlorobutadiene popcorn polymers, but available published and unpublished kinetic studies are in conflict concerning their rate of growth, and there is no data on the dichlorobutadiene popcorn polymer. In consequence, current relief system design procedures are based on a worst case scenario about popcorn growth rates and thus the design may be unduly expensive. The research obtained reliable kinetic data to allow these 'popcorn search' schedules to be rationalised and relief system designs to be improved and as a result to reduce the company's expenditure and improve operational safety margins. The proposed research was to investigate the kinetic behaviour of chlorinated butadiene monomers in the formation of omega- or 'popcorn' polymers. The growth rates of the chloroprene popcorn polymer were investigated at various temperatures in the liquid phase in the pure chloroprene monomer, mixed with other monomers and diluted with toluene in what we term 'Korean' type experiments. In these experiments the growth of popcorn polymer was terminated in a set of identically prepared ampoules after a fixed time. The growth rates of popcorn polymer seeds were obtained over various time periods, namely 24, 43 and 54 hours, at temperatures ranging from 10 deg C to 60 deg C. It was observed that the results differ greatly from those obtained by J.Op.Li. In particular, in the present work it was

  2. Naturally occurring amino acid: Novel curatives for chloroprene rubber

    Das, A.; Naskar, N.; Datta, R.N.; Bose, P.P.; Debnath, S.C.


    Polychloroprene is a diene rubber, but unlike other diene rubbers, its compounding with various additives and curing mechanisms is different. A derivative of thiourea, ethylene thiourea (ETU), is widely used to vulcanize chloroprene rubber (CR), and the vulcanizates thus obtained exhibit excellent m

  3. Inhalation developmental toxicology studies: Developmental toxicity of chloroprene vapors in New Zealand white rabbits. Final report

    Mast, T.J.; Evanoff, J.J.; Westerberg, R.B.; Rommereim, R.L.; Weigel, R.J.


    Chloroprene, 2-chloro-1,3-butadiene, is a colorless liquid with a pungent ethereal odor that is primarily used as an intermediate in the manufacture of neoprene rubber, and has been used as such since about 1930. This study addressed the potential for chloroprene to cause developmental toxicity in New Zealand white rabbits following gestational exposure to 0, 10, 40, or 175 ppm chloroprene vapors, 6h/dy, 7dy/wk. Each treatment group consisted of 15 artificially inseminated females exposed on 6 through 28 days of gestation (dg). Body weights were obtained throughout the study period, and uterine and fetal body weights were obtained at sacrifice on 29 dg. Implants were enumerated and their status recorded and live fetuses were examined for gross, visceral, skeletal, and soft-tissue craniofacial defects. There were no overt signs of maternal toxicity and the change in maternal body weight over the course of the study was not affected. Exposure of pregnant rabbits to chloroprene vapors on 6-28 dg had no effect on the number of implantation, the mean percent of live pups per litter, or on the incidence of resorptions per litter. The incidence of fetal malformations was not increased by exposure to chloroprene. Results of this study indicate that gestational exposure of New Zealand white rabbits to 10, 40, or 175 ppm chloroprene did not result in observable toxicity to either the dam or the offspring.

  4. Electrical conductivity of short carbon fibers and carbon black-reinforced chloroprene rubber

    Elastomers and plastics are intrinsically insulating materials, but by addition of some conductive particles such as conductive carbon black, carbon fibers and metals, they can change to conductive form. Conductivity of these composites are due to formation of the lattices of conductive filler particles in polymer chains. In this report, conductivity of chloroprene rubber filled with carbon black and carbon fibers as a function of temperature and pressure are studied. Electrical conductivity of chloroprene in a function of temperature and pressure are studied. Electrical conductivity of chloroprene in the presence of carbon black with proper mixing conditions increases to the conductivity level of semiconductors and even in the presence of carbon fibers it increases to the level of a conductor material. Meanwhile, the sensitivity of this compound to heat and pressure rises. Thus these composites have found various applications in the manufacture of heat and pressure sensitive sensors

  5. Newly developed chloroprene rubber composites based on electron-modified polytetrafluoroethylene powder

    Compatibility via chemical coupling between electron-modified polytetrafluoroethylene (PTFE) powder and poly-2-chlorobutadiene rubber is accomplished by activation of the radiation-induced carboxylic groups on the PTFE surface by zinc oxide. This is achieved both prior to and during reactive blending of zinc oxide with chloroprene rubber. Spectroscopic analysis of the reaction products reveals an increase in characteristic chloroprene absorption (∼1660 cm-1) due to the stretching of the C=C bond. Microscopic observations suggest that the PTFE dispersion is considerably improved, while the state of interphase between the PTFE particles and the chloroprene rubber indicates enhanced compatibility. The increase in the cross-link density determined by Mooney-Rivlin plots provides indirect evidence for the existence of chemical coupling. PTFE-based chloroprene composite exhibits a significant increase in modulus due to the strong reinforcement effect of the modified PTFE powder. Finally, we propose an explanation of the coupling mechanism based on the chemical activation of carboxylic groups in the PTFE powder in the presence of zinc oxide.

  6. Newly developed chloroprene rubber composites based on electron-modified polytetrafluoroethylene powder

    Sohail Khan, M., E-mail: [Leibniz Institute of Polymer Research Dresden, Hohe Strasse 6, 01069 Dresden (Germany); Lehmann, D.; Heinrich, G. [Leibniz Institute of Polymer Research Dresden, Hohe Strasse 6, 01069 Dresden (Germany)


    Compatibility via chemical coupling between electron-modified polytetrafluoroethylene (PTFE) powder and poly-2-chlorobutadiene rubber is accomplished by activation of the radiation-induced carboxylic groups on the PTFE surface by zinc oxide. This is achieved both prior to and during reactive blending of zinc oxide with chloroprene rubber. Spectroscopic analysis of the reaction products reveals an increase in characteristic chloroprene absorption ({approx}1660 cm{sup -1}) due to the stretching of the C=C bond. Microscopic observations suggest that the PTFE dispersion is considerably improved, while the state of interphase between the PTFE particles and the chloroprene rubber indicates enhanced compatibility. The increase in the cross-link density determined by Mooney-Rivlin plots provides indirect evidence for the existence of chemical coupling. PTFE-based chloroprene composite exhibits a significant increase in modulus due to the strong reinforcement effect of the modified PTFE powder. Finally, we propose an explanation of the coupling mechanism based on the chemical activation of carboxylic groups in the PTFE powder in the presence of zinc oxide.

  7. Chronic inhalation toxicity and carcinogenicity studies on β-chloroprene in rats and hamsters

    Trochimowicz, H.J.; Löser, E.; Feron, V.J.; Clary, J.J.; Valentine, R.


    Three groups of 100 Wistar rats and Syrian golden hamsters of each sex were exposed by inhalation to 0, 10, or 50 ppm (v/v) β-chloroprene for 6 h/day, 5 days a week for up to 24 and 18 too, respectively. To maintain the chemical integrity of this highly reactive material in the exposure chambers, β-

  8. DNA Interstrand Cross-Linking Activity of (1-Chloroethenyl)oxirane, a Metabolite of β-chloroprene

    Wadugu, Brian A.; Ng, Christopher; Bartley, Bethany L.; Rowe, Rebecca J.; Millard, Julie T.


    With the goal of elucidating the molecular and cellular mechanisms of chloroprene toxicity, we examined the potential DNA cross-linking of the bifunctional chloroprene metabolite, (1-chloroethenyl)oxirane (CEO). We used denaturing polyacrylamide gel electrophoresis to monitor possible formation of interstrand cross-links by CEO within synthetic DNA duplexes. Our data suggest interstrand cross-linking at deoxyguanosine residues within 5′-GC and 5′-GGC sites, with the rate of cross-linking depe...

  9. Study of properties of chloroprene rubber devulcanizate by radiation in microwave

    Scagliusi, Sandra R.; Araujo, Sumair G.; Landini, Liliane; Lugao, Ademar B., E-mail: scagliusi@usp.b [Instituto de Pesquisas Energeticas e Nucleares (IPEN/CNEN-SP), Sao Paulo, SP (Brazil)


    Among the vulcanized elastomers, the chloroprene rubber (DuPont Neoprene{sup R} - generic name) possesses a good performance, being one of the most used in the current days. However, this kind of polymer causes a serious environmental problem if it is not reprocessed or recycled. A worldwide method that has been used and that is an important tool in the rubber devulcanization is microwave irradiation at high temperature Elastomer waste may be devulcanized without depolymerization and allows a new vulcanization into a product having physical properties essentially equivalent to the original vulcanized. In this work, the chloroprene samples were irradiated in microwave generator equipment with 2,450 MHz (frequency) and 1,000 W to 3,000 W (power). The properties of samples (according to ASTM standards) were analyzed before and after irradiation. The degraded material after irradiation will be tested for re-use. (author)

  10. Study of properties of chloroprene rubber devulcanizate by radiation in microwave

    Among the vulcanized elastomers, the chloroprene rubber (DuPont NeopreneR - generic name) possesses a good performance, being one of the most used in the current days. However, this kind of polymer causes a serious environmental problem if it is not reprocessed or recycled. A worldwide method that has been used and that is an important tool in the rubber devulcanization is microwave irradiation at high temperature Elastomer waste may be devulcanized without depolymerization and allows a new vulcanization into a product having physical properties essentially equivalent to the original vulcanized. In this work, the chloroprene samples were irradiated in microwave generator equipment with 2,450 MHz (frequency) and 1,000 W to 3,000 W (power). The properties of samples (according to ASTM standards) were analyzed before and after irradiation. The degraded material after irradiation will be tested for re-use. (author)

  11. Three-dimensional modeling of chloroprene rubber surface topography upon composition

    Žukienė, Kristina, E-mail: [Department of Clothing and Polymer Products Technology, Kaunas University of Technology, Studentu St. 56, LT-51424 Kaunas (Lithuania); Jankauskaitė, Virginija [Department of Clothing and Polymer Products Technology, Kaunas University of Technology, Studentu St. 56, LT-51424 Kaunas (Lithuania); Petraitienė, Stase [Department of Applied Mathematics, Kaunas University of Technology, Studentu 50, LT-51368 Kaunas (Lithuania)


    In this study the effect of polymer blend composition on the surface roughness has been investigated and simulated. Three-dimensional modeling of chloroprene rubber film surface upon piperylene-styrene copolymer content was conducted. The efficiency of various surface roughness modeling methods, including Monte Carlo, surface growth and proposed method, named as parabolas, were compared. The required parameters for modeling were obtained from atomic force microscopy topographical images of polymer films surface. It was shown that experimental and modeled surfaces have the same correlation function. The quantitative comparison of function parameters was made. It was determined that novel parabolas method is suitable for three-dimensional polymer blends surface roughness description.

  12. 水性氯丁胶乳的制备、改性及应用%Synthesis,modification and application of water based chloroprene latexes

    李吉; 马文石; 胡维浦


    水性氯丁胶乳因其对环境友好、无毒、不可燃等优点而成为氯丁橡胶发展的一个重要分支.介绍了水性氧丁胶乳的制备方法、改性手段及其在水性胶粘剂领域中的应用.%The environmental friendly,nontoxic and incombustible water based chloroprene latexes had become an important branch of chloroprene rubber.The methods of synthesis and modification for water based chloroprene latexes were introduced. Simultaneously,the applications of water based chloroprene latexes were also summarized.

  13. Study of radiation-induced grafting of 2-hydroxyethyl methacrylate to chloroprene rubber membrane

    The radiation-induced grafting copolymerization of HEMA to chloroprene rubber membranes were studied by means of irradiation of cobalt-60 gamma ray. The structure and surface morphology of both grafted and ungrafted CR membranes were observed by FT-IR-PAS spectroscopy and scanning electron microscope (SEM), respectively. The experimental results showed that the change of the degree of grafting in a mixed solvent of water and ethanol is S-shaped curve. The degree of grafting increases with increasing pH values in grafting solution. The influences of dose, dose rate, monomer concentration and grafting temperature were investigated. The degree of grafting does not change with increasing membrane thickness. This result showed that the grafting of HEMA to CR membrane is surface grafting

  14. Interaction of Chloroprene and Nitrile- Butadiene Rubber with Lubricating Greases and Base Oils


    The present communication addresses compatibility of two synthetic rubber types, chloroprene and nitrilebutadiene ones, with a number of base oils of petroleum origin and lubricating greases produced thereof. Four base oils,including three naphthenic products with varying degrees of refining and one paraffinic product,were compared with each other in terms of their effect on the rubbers. Degenerative changes occurring in the rubbers on contact with the oils and greases were studied using accelerated ageing tests. Alterations in rubber parameters, such as hardness, weight and glass transition temperature, caused by interaction with oil were monitored. The main physicochemical mechanisms standing behind the changes observed in the rubber properties were found to be (i) migration of plasticizer from rubber into the oil phase, (ii) absorption of oil by rubber,and (iii) oxidation of rubber. An increase in glass transition temperature (Tg) of rubber aged in a base oil or grease was considered as an indirect indication that the plasticizer had migrated out of rubber;the plasticizer accumulation in the oil phase being directly confirmed by gas chromatography. In order to suppress the plasticizer migration, oil additivation with dioctyl adipate (DOA), a common plasticizer used in rubber formulations, was attempted. However, the BOA-additivated oils, while reducing plasticizer migration, were found to cause more swelling than the original oils in the case of chloroprene rubber. As an alternative, replacement of BOA by an alkylated aryl phosphate in nitrile- butadiene rubber formulations was considered, but it did not solve the problem either.The results of this study suggest conclusively that the type of rubber, the plasticizer, and the base oil are all the crucial parameters that should be considered when matching rubber with oil in real- life applications. Interaction of rubber with base oils and with greases produced thereof is largely controlled by (i) solvency of the

  15. An investigation on chloroprene-compatibilized acrylonitrile butadiene rubber/high density polyethylene blends

    Khalil Ahmed


    Full Text Available Blends of acrylonitrile butadiene rubber/high density polyethylene (NBR/HDPE compatibilized by Chloroprene rubber (CR were prepared. A fixed quantity of industrial waste such as marble waste (MW, 40 phr was also included. The effect of the blend ratio and CR on cure characteristics, mechanical and swelling properties of MW-filled NBR/HDPE blends was investigated. The results showed that the MW-filled NBR/HDPE blends revealed an increase in tensile strength, tear, modulus, hardness and cross-link density for increasing weight ratio of HDPE. The minimum torque (ML and maximum torque (MH of blends increased with increasing weight ratio of HDPE while scorch time (ts2 cure time (tc90, compression set and abrasion loss of blends decreased with increasing weight ratio of HDPE. The blends also showed a continuous reduction in elongation at break as well as swelling coefficient with increasing HDPE amount in blends. MW filled blends based on CR provided the most encouraging balance values of overall properties.

  16. In situ monitoring of the ambient air around the chloroprene rubber industrial plant using the Tradescantia-stamen-hair mutation assay

    Arutyunyan, RM; Pogosyan, VS; Simonyan, EH; Atoyants, AL; Djigardjian, EM


    The city of Yerevan, the capital of Armenia, has been one of the heavily polluted cities since the earlier USSR era. A Chloroprene Rubber Industrial Plant has been the major contributor of air pollution in this city. The first attempt has been undertaken to detect the mutagenic effect of the ambient

  17. Research progress of modification of chloroprene rubber%氯丁橡胶的改性研究进展

    曾凤娟; 刘作华; 左赵宏; 杜军; 陶长元


    Chloroprene rubber (CR) is one of the most important synthetic rubbers. In this paper,filling modification,blending modification,graft modification and chemical modification of CR are reviewed. Besides,the technology progress in the field of modification of CR and the main characteristics and uses of modified CR are presented. Compared to filling modification,blending modification and graft modification,research on chemical modification is relatively few,mainly focused on hydrogenated modification. With respect to hydrogenated modification,halogenated modification is not only able to saturate residual double bond in chloroprene rubber,but also able to improve the activity of rubber vulcanization. Therefore,optimization of hydrogenated modification and exploration of halogenated modification of CR will be the future direction of modification of chloroprene rubber.%  氯丁橡胶是最重要的合成橡胶之一。本文综述了氯丁橡胶的填充改性、共混改性、接枝改性及化学改性,介绍了氯丁橡胶改性领域的技术进展和改性氯丁橡胶的主要特性及用途。相比于填充改性、共混改性和接枝改性,氯丁橡胶的化学改性研究相对较少,目前主要集中在氢化改性。相对于氢化,卤化改性不但能够饱和氯丁橡胶中的残余双键,而且可以提高橡胶的硫化活性,改善硫化困难的缺点,因此,优化氯丁胶的氢化改性工艺、探索氯丁橡胶的卤化改性、使其具有更好的综合性能将是今后氯丁橡胶改性的发展方向。

  18. Synthesis and characterization of NaA zeolite particle as intumescent flame retardant in chloroprene rubber system

    Wenhui Yuan; Huarong Chen; Ranran Chang; Li Li


    NaA zeolite with average particle size of 1 μm was successfully synthesized by microwave heating. Influences of pre-crystallization time, microwave power and microwave heating time on the synthesis of NaA zeolite were investigated. The as-synthesized sample was characterized by X-ray diffraction (XRD),scanning electron microscopy (SEM) and particle size distribution (PSD). Thermal and flame retardant properties as intumescent flame retardant (IFR) in chloroprene rubber (CR) system, such as thermogravimetry (TG), limiting oxygen index (LOI), burning rate (BR) and specific extinction area (SEA) were further investigated by adding NaA zeolite particles to CR. Experimental results show that the thermal stability and LOI value increased while BR and SEA decreased by adding 5 phr NaA zeolite into the 40 phr IFR filled CR system.

  19. Development status and prospect of chloroprene rubber at home%我国氯丁橡胶发展现状及展望

    李贺; 刘权毅


    氯丁橡胶是最先实现工业化生产的合成弹性体.本文综述了氯丁橡胶的发展现状及发展展望,着重论述了氯丁橡胶的生产发展现状、市场发展现状和技术发展现状,展望了氯丁橡胶未来的发展,并提出发展建议.%The production, technology and market status of chloroprene rubber at home were reviewed in this paper. The developing trend for future chloroprene rubber was prospected.

  20. 粘结型粉末氯丁橡胶的制备方法%Preparation of bonding powdered chloroprene rubber

    赵志超; 马朋高; 郑聚成; 李波; 胡育林; 秦传高


    采用直接凝聚法制备了粉末氯丁橡胶PCR244,并讨论了凝聚剂种类和用量、隔离剂种类和用量、凝聚温度以及凝聚体系的pH值对PCR244粉末化效果的影响.研究表明,在低温条件下凝聚所得粉末氯丁橡胶的成粉率高,溶解速率快,且粘结强度高.%Powdered chloroprene rubber PCR244 was prepared by direct coagulation process,and the effects of kind and amount of coagulating agent, kind and amount of separating agent,coagulation temperature and pH value of coagulating system on powdered ratio of chloroprene rubber PCR244 were studied. The results showed that powdered ratio and bond strength of powdered chloroprene rubber PCR244 obtained under low temperature were higher,and dissolution rate of that was faster.


    BIAN Xinsheng; HAN Xiaozu; WANG Xinren; ZHANG Qingyu


    A series of liquid chloroprene-methacrylic acid copolymer (CP-co-MAA) modified epoxy resin (ER)/poly (butyl methacrylate) (PBMA) semi-IPN were synthesised. Some physical properties were investigated. DSC diagrams showed two indistinct and inward endothermal transitions corresponding to the transitions of two networks in the semi-IPN system. By observing morphology with SEM technique it shows that there is a multiphase structure, in which CP-co-MAA's domain sizes are about 0.10-0.80μ. With increasing C/E ratio, the domain εizes are getting smaller, which is due to effect of mixing network of CP-co-MAA promoting entanglement and interpenetrating of PBMA and CP-co-MAA-ER network. In most of the semi-IPN's compositions, ER phase readily maintains its phase continuity while PBMA phase presents a hand shape structure. Consequently, crosslinking network keeps in its continuous phase more readily than uncrosslinking one, thus it influences dominantly on the physical properties.

  2. Synthesis of a flexible poly(chloroprene)/methyl red film dosimeter using an environment-benign shear compounding method

    The paper reports synthesis of a new film dosimeter based on a solvent-free route. Methyl red (MR) dye was introduced into poly(chloroprene) (PC) in various concentrations. The films were intensely red with λmax ~515 nm. The absorbance decreased linearly with absorbed radiation dose up to 30 kGy without a significant change in λmax. Color coordinates of the films were also analyzed. Optical micrographs of the films showed no signs of inhomogeneous distribution of MR in the PC matrix, which was attributed to the polarity of PC. Radiation sensitivity, dose response linearity, effects of irradiation temperature and humidity, as well as the rate of fading, were also investigated. - Highlights: • A new film dosimeter was developed through solvent free route. • The dispersion of dye was homogeneous. • The dose linearity was observed up to 30 kGy. • There was no dose rate or temperature dependence. • No significant dependence on humidity was observed till 75% RH

  3. 低硬度氯丁橡胶减震胶垫的研制%Research and Development of Chloroprene Rubber Damping Pad with Low Hardness



    The properties of mechanical and heat air aging and dimension stability of the chloroprene rubber were studied, as the damping pad in a air-condition compressor with the different chloroprene rubbers and the softeners. And the relationships between the three dimension stability and hardness of the damping pad and the used time were discussed. Research results show that the properties of chloroprene rubber compounds and products suffice the technical criterion of high performance the damping pad in a air-condition compressor. The three dimensional stability of the products is better than the one of same products of Japan.%通过考查不同牌号的氯丁橡胶和软化剂,研究了作为压缩机减震胶垫的氯丁橡胶胶料的力学性能、老化性能及尺寸稳定;并进行了6个月的装机对比实验,研究了装机应用时间与减震胶垫三维尺寸稳定性及硬度关系.研究结果表明:所研制的胶料及产品的性能完全满足日本高性能压缩机减震胶垫的技术要求.装机应用证明:其应用三维尺寸稳定性远好于日本同类产品.

  4. Influence of modified waste rubber powde on the properties of chloroprene rubber%改性废胶粉对氯丁橡胶性能的影响

    游建华; 高扬建树; 李乐凡; 汪军旗; 郑诗选; 汪志芬; 方林


    将经间苯二酚和六次甲基四胺改性的废胶粉与氯丁橡胶(CR)共混,制备改性废胶粉/CR共混物.研究了废胶粉的改性方法对共混物性能的影响,并探讨了废胶粉用量对共混物硫化特性和物机性能的影响.研究结果表明:废胶粉经间苯二酚和六次甲基四胺改性后,共混物的综合力学性能较未改性废胶粉的提高,Tg变化不大.%Waste rubber powde(WRP) was modified by resorcin and methenamine,and the WRP/chloroprene rubber (CR) blend was prepared by blending the modified WRP with chloroprene rubber.The effects of blending method and dosage of WRP on cure and mechanical properties of WRP/CR blend were investigated.The results showed the mechanical properties of WRP/CR blend increased after modification with WRP,but the Tg haven't changed much.

  5. Application of linear alkyl benzenesulfonic acid resin in chloroprene adhesives%烷基苯酸树脂在氯丁型胶粘剂中的应用

    凌辉; 钟锋; 李军; 陈亮; 刘根伸


    以烷基苯酸树脂部分取代酚醛树脂,探讨烷基苯酸树脂和酚醛树脂的混合比对氯丁型胶粘剂粘剂性能的影响。结果表明,当混合树脂中烷基苯酸树脂用量为20%~30%时,胶粘剂综合性能较优。%Using the alkyl benzenesulfonic acid resin partly instead of the phenolic resin, the effect of mixing proportion of benzenesulfonic acid resin and phenolic resin on the performance of chloroprene adhesives was discussed. The results showed that when the benzenesulfonic acid resin content was 20%~30%, the comprehensive performance of adhesives was optimal.

  6. Analysis and Solutions of Sealing Leakage of Chloroprene Rubber Sealing Ring%氯丁橡胶滚动密封圈密封不严及其解决措施

    易学平; 戴乐


    This paper analyzed the reason of sealing leakage ,and selects highly anti-crystallized chloroprene rubber DCR114 and DCR213 and (75/25) instead of the original chloroprene rubber CR232 .The experiment on the changes of hardness is carried out . There is no leakage of rolling sealing ring after improvement .%对水下振源体的滚动密封圈密封不严问题产生的原因进行了分析,选择高抗结晶性能的氯丁橡胶DCR114和DCR213并用(75/25)代替原来的氯丁橡胶CR232,通过了硬度变化试验,改进后的滚动密封圈未再出现漏水现象。

  7. Study on the Effect Factors of Lap-Shear Strength of Chloroprene Rubber Adhesive%氯丁型胶粘剂拉伸剪切强度的影响因素探讨

    凌辉; 朱明新; 梁银齐; 毛秋燕; 陈炳江; 陈炳耀


    The author studies on the test conditions of lap-shear strength of chloroprene rubber adhesive by considering the effect factors such as the contact area of adhesive test samples,the waiting-time after being brushed,drying and compression.Then search on the suitable condition for testing the lap-shear strength of chloroprene rubber adhesive.%主要从胶粘剂测试试件粘接面积、晾胶时间以及干燥和加压等影响因素着手,对氯丁型胶粘剂拉伸剪切强度的测试条件进行了研究与讨论。得出测试氯丁型胶粘剂拉伸剪切强度较为合适的条件。

  8. Synthesis and properties of iodoform-regulated chloroprene rubber%碘仿调节型氯丁橡胶的合成及性能

    谷巨明; 付志峰; 石艳; 傅涛


    The chloroprene rubber(CR) was synthesized according to the domestic traditional formula in large-scale industrial production and reaction conditions of adhesive type CR-244, with iodoform as a relative molecular mass regulator to replace the traditional dithiodiisopropyl xanthate, and the all-round properties of the CR and the effect of iodoform amount on the molecular mass distributions of CR were investigated. The results showed that with iodoform as the relative molecular mass regulator, the adhesive type CR could be prepared, which Mooney viscosity, peeling strength, solution rotary viscosity,and other performance indexes all identical to those of CR-244 and had good reproducibility. The emulsion polymerization of chloroprene was found to have the characteristics of living radical polymerization and the molecular mass distributions got narrower with the increase of iodoform amount.%用碘仿取代二硫化二异丙基黄原酸酯作相对分子质量调节剂,按照国内传统黏接型氯丁橡胶(CR)-244大生产配方及反应条件制备了CR,并考察了其综合性能以及碘仿用量对CR分子量分布的影响.结果表明,用碘仿作相对分子质量调节剂,可制备出门尼黏度、剥离强度、溶液旋转黏度等综合性能与CR-244橡胶一致、且重现性好的黏接型CR;氯丁二烯乳液聚合具有一定的活性自由基聚合特征,且随着碘仿用量的增大,CR的分子量分布有变窄的趋势.

  9. Determination of Chloroprene in Surface Water by Headspace Capillary GC%顶空-毛细管气相色谱法测定地表水中氯丁二烯

    刘志航; 戴晓莹; 张丰


    A method of headspace capillary GC for determination of chloroprene in surface water was establish.Chloroprene was separated by HP-INNOWAX capillary column.With optimal shunt ratio,chloroprene showed a good linear range from 1~90 μg/L(r=0.9994).The method detection limint(S/D=10) was 0.01 μg/L,recovery was in the range of 98.5 %~104.3 %,and RSD was 2.45 %.The established method is convenient,fast,sensitive and accurate,and can be used for determination of chloroprene in surface water.%建立了顶空-毛细管柱-FID气相色谱检测地表水中氯丁二烯的方法。采用HP-INNOWAX色谱柱分离,优化了分流比及顶空条件,氯丁二烯在1~90μg/L的范围内获得了良好的线性关系(r=0.9994),检出限(S/D=10)为0.01μg/L,地表水实际样品的加标回收率为98.5%~104.3%,相对标准偏差为2.45%。该方法操作简便、快速、灵敏度高,准确度和精密度均能满足检测要求,适用于地表水中氯丁二烯的检测。

  10. 烟火剂型底排药中氯丁橡胶和松脂酸钙测定方法研究%Determination of Chloroprene Rubber, Calcium Resinate in Pyrotechnic Composition BB Pellet

    王风清; 朴哲镐; 董男平; 周亚娟; 张华


    烟火剂型底排药成分分析用甲苯-乙酸乙酯混合溶剂溶解氯丁橡胶、松脂酸钙和六次甲基四胺,通过蒸馏水萃取除去六次甲基四胺组分,盛装于烧杯中蒸干的氯丁橡胶、松脂酸钙再用乙酸乙酯溶解松脂酸钙转移分离,从而实现氯丁橡胶和松脂酸钙定量分离检测研究.产品检测应用表明,甲苯-乙酸乙酯混合溶剂对单质氯丁橡胶、松脂酸钙、六次甲基四胺回收率在98%以上.试验研究和实际产品检验中,氯丁橡胶、松脂酸钙检测误差均在±1.5%内(相对误差小于10%).该方法也可应用于类似混合炸药的成分分析.%In the analysis of pyrotechnic composition BB pellet, toluene ethyl acetate mixed solvent used for dissolving chloroprene rubber, calcium resinate and six methyl four amine was extracted by distilled water. After the compound being dried, the left chloroprene rubber, calcium resinate were dissolved by toluene-ethyl acetate mixed solvent, thereby the quantitative separation and detection of chloroprene rubber and calcium resinate were realized. Product detection application showed that the recoveries of toluene-ethyl acetate mixed solvent to chloroprene rubber, calcium resinate amd six methyl four amine were more than 98%. The detection error of chloroprene rubber, calcium resinate in experiment and actual production was within ±1.5%(the relative error was less than 10%). This method also can be used in the similar mixed explosive composition.

  11. Synthesis of iodoform-mediated general-purpose chloroprene rubber%碘仿调节通用型氯丁橡胶的合成

    谷巨明; 闫新华; 石艳; 赵珏; 安粒; 果辰; 付志峰


    With iodoform as the relative molecular mass mediator, the chloroprene rubber ( CR) was successfully synthesized by emulsion polymerization of chloroprene according to the domestic traditional industrial large-scale production formula and processing conditions of general-purpose CR-232. The effects of iodoform amount on the all-round properties and number-average molecular weight and molecular weight distribution of synthesized CR were investigated, and the iodoform mediated CR was compared with those regulated by traditional regulator D. The results showed that the CR prepared achieved qualified property indexes of traditional regulator D including Mooney viscosity, tensile properties, volatile and ashes except shorter Mooney scorch time when the amount of iodoform was 0. 38% ,0. 40% ,0. 42% . The number-average molecular weight of CR increased linearly with monomer conversion, and the more the iodoform was added , the lower the number-average molecular weight was.%以碘仿为相对分子质量调节剂,按照国内传统通用型氯丁橡胶(CR)(牌号为CR - 232)的生产配方及工艺条件,对氯丁二烯进行乳液聚合制得CR,考察了碘仿用量对CR综合性能及数均分子量、分子量分布的影响,并与传统调丁型CR - 232的性能加以对比.结果表明,当碘仿质量分数为0.38%,0.40%,0.42%时,除门尼焦烧时间稍短外,CR的门尼黏度、拉伸性能及挥发分、灰分均能达到传统调丁型CR - 232的指标;CR的数均分子量随着单体转化率的提高基本呈线性增长;在相同转化率下,碘仿用量越大,CR的数均分子量越小.

  12. 基于酸腐蚀的板式氯丁橡胶支座受压试验研究%Compression Tests of Plain Chloroprene Rubber Bearings U nder Acid Corrosion Condition

    张延年; 马良; 刘宁; 郑怡; 沈小俊; 高飞


    Plain chloroprene rubber bearings of highway bridge are more vulnerable to corrosion of acid precipitation .In order to research on the various mechanics performance of plain chloroprene rubber bearings of highway bridge under different acid corrosion condition .The chloroprene rubber bearings were dealt with 3 .0% sulfuric acid for 20d ,40d ,60d and 80d ,and the compressive behavior of those were tested with pressure testing machine .The apparent ,dimension ,ultimate compressive strength , vertical stiffness and elastic modulus of compression were analyzed comparatively .The results show that local deformations of plain chloroprene rubber bearings of highway bridge become more obvious and brittle failures can happen more easily with the increase of contact time with acid corrosion .The attenuation law of the ultimate compressive strength of plain chloroprene rubber bearings of highway bridge under acid corrosion condition is analyzed ,and the parameters of the degradation model are es-timated by the least square method .Moreover ,the ultimate compressive strength ,vertical stiffness and elastic modulus of compression are more significantly decreased . The ultimate compressive strength ,vertical stiffness and elastic modulus of compression cannot meet the engineering require-ment while acid corrosion to a certain degree .Thus ,some preventive measures should be taken to pre-vente plain chloroprene rubber bearings of highway bridge corroding .%公路桥梁板式橡胶支座比其他橡胶支座更容易受到酸雨的影响,为了研究不同腐蚀时间下公路桥梁板式氯丁橡胶支座经过酸腐蚀后的各项力学性能变化,采用3.0%的硫酸溶液对公路桥梁氯丁橡胶支座分别进行20,40,60和80 d的酸腐蚀处理,并采用5000 kN压力试验机进行轴心受压试验研究.分别对其表观、外形尺寸、极限抗压强度、竖向刚度和抗压弹性模量等进行对比分析.结果表明腐蚀时间越长,公

  13. Effect of blend ratio on aging, oil and ozone resistance of silica-filled chloroprene rubber/natural rubber (CR/NR blends


    Full Text Available The effect of blend ratio on properties of chloroprene rubber/natural rubber (CR/NR blends was investigated. In addition to the mechanical properties, attention was also given to the resistance to thermal aging, oil and ozone of the blends. Silica was selected as a reinforcing filler in this study due to its unique characteristic to interact with CR. The results reveal that, due to the better filler dispersion and the greater crosslink density, the silica-filled CR possesses lower compound viscosity and better mechanical properties, compared to the silica-filled NR. The aging properties, oil and ozone resistance of the silica-filled CR are also significantly better than those of the silica-filled NR. The mechanical properties and the resistance to degradation of the silica-filled CR/NR blends are mainly governed by the blend morphology. It is found that good mechanical properties in association with adequately high resistance to degradation from thermal aging and oil are obtained when CR remains the matrix in the blends. Even though the ozone cracks are found in all blends, a thorough look at the results reveals that considerable improvement in ozone resistance is achieved with increasing CR content.

  14. Research on Sulfur-modified Chloroprene SN12X%SN12X型氯丁橡胶的研制及性能研究

    黄毅; 李俊


    Sulfur-modified chloroprene SN12X is researched and produced by Shanna synthetic rubber group.SN12X has good tensile strength,excellent processing performance and long scorch time,and mooney viscosity of SN12X is stable.The comprehensive performance of SN12X reached the level of GNA and PM40A produced by DuPont and Denka respectively.SN12 X can replace similar foreign products in many fields.%SN12X是山纳合成橡胶集团公司研发、生产的硫磺调节型系列氯丁橡胶,该产品具有门尼黏度稳定、拉伸强度大、焦烧时间长、加工性能好、产品质量稳定等特点,其综合性能基本达到GNA、PM40A等国外同类产品水平,在绝大多数领域可以替代国外同类产品.

  15. 基于PCA-BP网络的氯丁橡胶门尼黏度预测%Prediction of Mooney Viscosity of Chloroprene Rubber Based on PCA-BP NN

    马为霞; 赵国新; 任来红


    为了准确预测氯丁橡胶门尼黏度,采用氯丁橡胶生产工艺机理及数据分析结果相结合的方法,选取影响门尼黏度的主要因素,提出了一种基于 PCA-BP 神经网络的氯丁橡胶门尼黏度的软测量预测方法,建立了双隐含层的神经预测网络模型。通过训练,确定网络结构为6-5-13-1。仿真显示,最大相对误差为4.1%,平均相对误差为1.8%,最大绝对误差为4.389,误差在允许的范围内,满足生产要求。%In order to predict chloroprene rubber Mooney viscosity exactly,method of finding the main factors influencing Mooney viscosity is found combining production process mechanism of chloroprene rubber with the results of data analysis. A method of prediction of chloroprene rubber Mooney viscosity based on PCA and BP neural network is proposed and a double-hidden layer model of ANN is built. The network structure is proved to be 6-5-13-1 by training. The simulation shows that the maximum relative error is 4. 1%,the average relative error is 1. 8% and the maximum absolute error is 4. 389 which is in the permission range,and it can be used for conducting production.

  16. Properties of Chloroprene Rubber SN121%氯丁橡胶SN121基本性能的研究



    The basic properties of chloroprene rubber SN121 was investigated and compared with Shanna CR121 and similar foreign products GW and GS. The processing property of SN121 in two roll mill and inner mixer was good, similar to GW and GS, and better than CR121. The product quality was uniform and stable. The Mooney scorch time and t10 were long, indicating good processing safety, and the curing speed was moderate. The Mooney viscosity was similar to CR121 and GW. The tensile strength of the vulcanizates was similar to GW and GS, and higher than CR121. Overall, the comprehensive physical properties of SN121 were close to foreign products GW and GS, and better than domestic product CR121.%研究氯丁橡胶SN121的基本性能,并与国内同类产品山纳CR121及国外同类产品GW和GS进行对比。结果表明:SN121在开炼机上的包辊性能和在密炼机中的混炼性能良好,与GW和GS相近,优于CR121,内在质量均匀、稳定;门尼焦烧时间和t10较长,具有较好的加工安全性,硫化速度适中;门尼粘度与CR121和GW相当;拉伸强度与GW和GS相近,高于CR121。SN121的综合物理性能与GW和GS相近,优于CR121。

  17. Shear tests of plain chloroprene rubber bearings of highway bridge under thermal aging condition%热老化条件下公路桥梁板式氯丁橡胶支座抗剪试验

    张延年; 单春红; 郑怡; 沈小俊; 高飞; 熊卫士


    The thermal aging process was simulated by the high temperature chamber.The plain chloroprene rubber bearings were processed by thermal aging treatment for 20,40,60 or 80 days,and then the shear tests were conducted.Compared with the standard piece,the impacts of thermal aging treatment on shear carrying capacity,ultimate shear strength,horizontal equivalent stiffness and shear elastic modulus were investigated.The test results show that the plain chloroprene rubber bearings are more prone to brittle failure under thermal aging treatment than the standard piece,and the shear failure of plate exposure,lamellar damage and cracks are more serious.The shear carrying capacity,ultimate shear strength,horizontal equivalent stiffness and shear elastic modulus of plain chloroprene rubber bearings are decreased with the increase of thermal aging degree.The shear strength and compressive elastic modulus for 50 years were investigated by the least squares method.According to the decay curve and the attenuation function,the trend is consistent with the law of exponential function.%利用高温试验箱模拟热老化过程,对氯丁橡胶支座进行20,40,60和80 d的热老化处理,进行抗剪试验.通过对比分析,研究热老化对氯丁橡胶支座的抗剪承载力、极限抗剪强度、水平等效刚度以及抗剪弹性模量的影响.结果表明:氯丁橡胶支座在热老化处理后,比标准试件更易发生脆性破坏,且钢板外露、层状破坏、裂缝等剪切破坏现象更为严重.随着热老化程度加深,氯丁橡胶支座抗剪承载力、极限抗剪强度、水平等效刚度和抗剪弹性模量逐渐降低.采用最小二乘法对50年的抗剪强度和抗压弹性模量进行了分析,由其衰减曲线和衰减函数可知,衰减变化趋势基本符合指数函数规律.

  18. Compression Tests of the Rectangular Plain Chloroprene Rubber Bearings in Salty Frozen Condition%盐冻条件下矩形氯丁橡胶支座受压性能试验

    沈小俊; 陈伯奎; 高飞; 谢应爽; 郑怡; 马良


    为了研究矩形氯丁橡胶支座在盐冻条件下的各项力学性能指标变化,将矩形氯丁橡胶支座分别进行20,40,60,80 d盐冻处理,并采用压力试验机对其进行轴心受压试验,研究盐冻对矩形氯丁橡胶支座的承载力、极限抗压强度、竖向刚度、抗压弹性模量的影响.试验结果表明:在盐冻条件下,矩形氯丁橡胶支座更易发生脆性破坏,弹性阶段缩短,发生钢板外露、裂缝、层状破坏等现象更严重;承载力、极限抗压强度、竖向刚度、抗压弹性模量随盐冻程度的加深而逐渐降低.采用最小二乘法对试验结果进行回归得到盐冻条件下矩形氯丁橡胶支座50 a抗压强度及抗压弹性模量衰减曲线和衰减模型,统计分析表明衰减曲线和衰减模型符合实际情况.%In order to do the research on the change of the mechanical indexes of the rectangular plain chloroprene rubber bearings,the rectangular plain chloroprene rubber bearings were processed under salty frozen condition for 20,40,60 and 80 days.Moreover,the axial compression tests were also carried out by pressure testing machine.The effect of the salt-frost on bearing capacity,ultimate compressive strength,vertical stiffness,and compressive elastic modulus of the rectangular plain chloroprene rubber bearings was also studied.The results showed that in salty frozen condition,brittle fracture of the plain chloroprene rubber bearings was easier to appear; the elastic stage was shorten and the phenomenon of steel plate exposure,cracks and layered destruction were more serious; the bearing capacities,ultimate compressive strength,vertical stiffness,and elastic modulus of compression decreased with the deepening of the salty frozen degree.The attenuation curve of compressive strength and compressive elastic modulus and the attenuation model were acquired in 50 years by regression analysis with the least square method.The statistical analysis result shows that the

  19. Determination of Chloroprene in Source Water by Headspace Capillary Gas Chromatography%毛细管顶空气相色谱法测定水源水中的氯丁二烯

    胡彬; 周倩如; 杨长晓


    Objective To establish capillary GC method for the determination of chloroprene in source water. Methods After the sample was equilibrated in a water bath of 60 ℃ for 20 min, the headspace gas was injected into the chromatograph, and the analyte was detected by a FID and quantified by external standard method. Results The limit of detection ( LOD) of the method was 0. 53μg/L, the spiked recoveries were 91. 2% - 102. 8% , and the relative standard deviation ( RSD) were 4. 2% -8. 5% . The linear range of method was 0. 002 - 0. 40 mg/L. Conclusion This method is applicable to determine chloroprene in source water.%目的 建立水源水中氯丁二烯的毛细管气相色谱检测方法.方法 样品在60℃水浴中平衡20 min后,采用抽气顶空进样法,GC-火焰离子化检测器(FID)检测,外标法定量.结果 方法检出限为0.53μg/L,加标回收率为91.2%-102.8%,相对标准偏差(RSD)为4.2%-8.5%.线性范围为0.002-0.40 mg/L.结论 该法可用于水源水中氯丁二烯的检测.

  20. 热老化条件下公路桥梁板式氯丁橡胶支座受压试验%Compression Tests of Plain Chloroprene Rubber Bearings of l Highway Bridge Under Thermal Aging Condition

    张延年; 单春红; 郑怡; 沈小俊; 高飞; 熊卫士


    The impact of climate is more serious to highway bridge rubber bearings than to building rubber bearings. In order to investi- gate the changes of the mechanical properties of plain chloroprene rubber bearings of highway bridge in high temperature of summer, the plain chloroprene rubber bearings were processed in 20, 40, 60, 80 days by high-temperature chamber, and then the axial compression tests were carried by pressure testing machine. The impact of thermal aging in carrying capacity, ultimate compressive strength, vertical stiffness, and elastic modulus of compression was analyzed. The results showed that, under thermal aging, the plain chloroprene rubber bearings was easier to brittle failure, the elastic stage was shorten, and the phenomenon which plate exposure, cracks and layered damage was more serious. With deepening of degree in thermal aging, the carrying capacities, ultimate compressive strength, vertical stiffness, and elastic modulus of compression were decreased. The dates of compressive strength and elastic modulus of compression in 50 years were analyzed using the least square method, and the results showed that the decay function and decay curve were basically in line with variation of power function.%公路桥梁橡胶支座比建筑橡胶支座更容易受到气候的影响。为了研究公路桥梁板式氯丁橡胶支座在热老化条件下的各项力学性能指标变化,将氯丁橡胶支座在高温试验箱中进行热老化处理20、40、60、80d,并采用压力试验机对其进行轴心受压试验。研究热老化对氯丁橡胶支座的承载力、极限抗压强度、竖向刚度、抗压弹性模量的影响。试验结果表明,在热老化条件下,氯丁橡胶支座更易发生脆性破坏,弹性阶段缩短,发生钢板外露、裂缝、层状破坏等现象更严重;承载力、极限抗压强度、竖向刚度、抗压弹性模量随热老化程度的加深而逐渐降低;采用最小二乘法对50年抗


    任庆海; 马养民; 张天福


    杜仲胶作为热塑性材料具有优异的低温可塑加工性和优良的耐水、耐寒、耐酸碱、高绝缘等特性,同时还具有高阻尼性,并且利用其高阻尼性可制作隔音设备与减震材料.作者将杜仲胶与氯丁橡胶共混,加入发泡剂,制备了具有良好吸声和隔音性能的杜仲胶/氯丁橡胶复合材料,并研究了复合材料各组分的最佳配比、发泡剂的最佳用量及其硫化特性.%Gutta-percha as low-temperature thermoplastic materials has excellent processing of plastic, excellent water resistance, cold resistance, acid and alkali resistance, high insulation and high damping.Gutta-percha can be used for insulation and damping materials due to its high damping of the system.In this paper, gutta-percha and chloroprene rubber were blended, and foaming agent was added into composite.Meanwhile, we studied the optimum proportion of the composite, the optimum amount of foaming agent and the curing characteristics of the composite.

  2. 白炭黑用量对氯丁橡胶/天然橡胶共混物性能的影响%Influence of silica loading on performance of chloroprene rubber/natural rubber blends



    研究了不同用量的沉淀法白炭黑填充质量比75/25的氯丁橡胶/天然橡胶共混物的物理机械性能、耐热老化性能和耐油性能,并用扫描电镜研究了共混物的结构.结果显示,白炭黑的加入改善了共混硫化物的拉伸强度、100%定伸应力和邵尔A硬度.压缩永久变形减小,黏度增大,从而导致在形变的过程中天然橡胶分散相占有率相对减少.相关性能也证明随着白炭黑用量的增加,硫化胶的耐热和耐油性能显著提高.%Blends of 75/25 ( mass ratio) chloroprene rubber ( CR )/natural rubber ( NR ) filled with various loadings of precipitated silica were prepared, and their mechanical properties as well as the resistances to thermal aging and oil were studied. The blend morphology was also studied by scanning electron microscope. The results show that the tensile strength, modulus and Shore A hardness of the blend vulcanizates are found to be improved noticeably with increasing silica loading, the compression set is impaired with increasing silica loading. In terms of phase morphology, the size of NR dispersed phase decreases with increasing silica loading due to the increase of compound viscosity. The results also demonstrate that both thermal aging resistance and oil resistance of the blend vulcanizates, as represented by the relative properties, are remarkably enhanced with increasing silica loading.

  3. Research on Wearability of nano-Attapulgite/Chloroprene Rubber Composites%纳米凹凸棒土/氯丁橡胶复合材料耐磨性的研究

    宋帅帅; 姚亮; 吴友平


    Attapulgite(AT)/chloroprene rubber(CR) composites was prepared by using mechnical mixing technology,and effects of AT content, modifier kinds and content and curing systems on wear-ability of the composites were discussed,and the surface morphology of Akron abrasion of the composites having the different modifiers was observed, too. The results showed that the wearability of the composites was the best when the amount of AT was 30 phr; Modifier KH —550 was an effective coupling agent in increasing the wearability of the composites,and the optimal content was 3% of AT content; The wearability was different by using different curing systems. The wearability of the composites was the best when curing agents MgO/ZnO/DCP mass ratio was 4/5/1.%采用机械共混法制备了凹凸棒土(AT)/氯丁橡胶(CR)纳米复合材料,探讨了AT用量、改性剂种类及用量和硫化剂体系等对复合材料耐磨性能的影响,还观察了使用不同改性剂制备的复合材料阿克隆磨耗表面形态.结果表明,AT用量为30份时复合材料耐磨性最好;改性剂KH-550能显著提高硫化胶耐磨性,其最佳用量为AT用量的3%;硫化体系不同时复合材料的耐磨性有所不同,采用MgO/ZnO/DCP(质量比为4/5/1)并用硫化体系时复合材料耐磨性最好.

  4. Mechanical Tests of Tetrafluoride Skateboard Plain Chloroprene Rubber Bearings of Highway Bridge under Freeze-Thaw Cycle Condition%冻融条件下公路桥梁四氟滑板氯丁橡胶支座力学性能试验

    张延年; 单春红; 郑怡; 熊卫士; 沈小俊; 高飞


    目的 研究公路桥梁四氟滑板氯丁橡胶支座经过冻融循环后的承载力变化情况,为各项公路桥梁的施工提供依据.方法 将四氟滑板氯丁橡胶支座放入标准冻融试验箱中进行100次的冻融循环处理,而后进行轴心受压及抗剪试验.与标准试件进行对比分析,研究承载力、极限抗压和抗剪强度、竖向刚度、水平等效刚度、弹性模量等各项性能指标的变化.结果 四氟滑板氯丁橡胶支座经过冻融循环处理,更易发生脆性破坏,且钢板外露、裂缝等破坏现象较标准试件更为严重.经处理的四氟滑板氯丁橡胶支座的承载力、极限抗压及抗剪强度、抗压及抗剪弹性模量小于标准试件.结论 经冻融循环处理,公路桥梁四氟滑板氯丁橡胶支座的各项力学性能指标均明显降低,建议提高四氟滑板氯丁橡胶支座的最低使用温度,严格控制其温度适用范围,在寒冷地区尽量采用天然橡胶支座.%In order to provide the basis for the construction of the highway bridge,we study the changes of capacity of the tetrafluoride skateboard plain chloroprene rubber bearings of highway bridge under freeze-thaw cycle condition. The tetrafluoride skateboard plain chloroprene rubber bearings were processed 100 times by freeze-thaw cycle in the standard freeze-thaw chamber,and then the axial compression and shear tests were carried. Compared with the standard test pieces, studied the changes of the performance indicators in the bearing capacity,the ultimate compressive strength and shear strength,vertical stiffness,horizontal e-quivalent stiffness, and elastic modulus. The results show that the tetrafluoride skateboard plain chloroprene rubber bearings which after the freeze-thaw cycle were more prone to brittle failure,the steel plate exposed, cracks and other damage phenomenon were more serious than the standard test pieces. The bearing capacity, ultimate compressive strength and shear

  5. Physical properties of blended and vulcanizednitrile-butadiene rubber/chloroprene rubber%共混硫化丁腈橡胶-氯丁橡胶的物理性能



    将丁腈橡胶(NBR)和氯丁橡胶(CR)按不同质量分数共混并硫化,研究了硫化橡胶在自然环境、热空气老化、热油老化等条件下的物理性能,并测定了硫化橡胶与镀铜钢丝的粘合性能.结果表明,随着 CR 质量分数的增大,混炼胶的焦烧时间逐渐缩短.经热空气老化后,NBR 的硬度增加幅度比 CR 的硬度增加幅度大,拉断强度降低幅度则比 CR 的小得多.此外,NBR 的耐油性能优于 CR.就物理性能以及与镀铜钢丝的粘合性能而言,单一 NBR 和单一 CR 优于共混 NBR/CR.%Nitrile-butadiene rubber (NBR)and chloroprene rubber (CR)were blended at differ-ent mass fractions and vulcanized,followed by aging at various conditions.The physical prop-erties of the vulcanized rubbers aged at ambient condition as well as in hot air and hot oil were determined,and their adhesion to Cu-coated steel wires was measured as well.Results indicate that,with the increase of the mass fraction of CR,the scorch time of the gross rubber tends to decline gradually.After being aged in hot air,the hardness of vulcanized NBR tends to rise more noticeably than that of vulcanized CR,while the tensile strength of the vulcanized NBR reduces at a much less extent than that of the vulcanized CR.Moreover,vulcanized NBR exhib-its better resistance against oil than vulcanized CR,while mono NBR and mono CR are advan-tageous over blended NBR/CR in terms of the physical properties and adhesion to Cu-coated steel wire.

  6. Compósitos de borracha natural ou policloropreno e celulose II: influência do tamanho de partícula Natural rubber or chloroprene rubber and cellulose II composites: influence of particle size

    Bruno de A. Napolitano


    Full Text Available O objetivo deste trabalho foi o desenvolvimento de compósitos claros com propriedades de interesse tecnológico utilizando elastômeros com diferentes polaridades. Para que este objetivo fosse atingido, celulose II em pó foi usada como carga, em borracha natural (NR ou policloropreno (CR. A celulose II foi obtida por coagulação da solução de xantato de celulose em meio ácido, sob agitação constante e à temperatura ambiente, constituindo uma nova forma de obtenção deste tipo de carga. Compósitos com 10 phr de celulose II com NR e CR, respectivamente, foram desenvolvidos tendo como variável o tamanho de partícula da carga. As propriedades mecânicas e os aspectos microscópicos dos diferentes compósitos foram avaliados e comparados com aqueles das formulações sem carga. Os resultados permitiram identificar o compósito como o de melhor resultado, influenciado pela polaridade da matriz elastomérica e pelo tamanho de partícula da carga, conseqüência das condições de moagem usadas.The aim of this work was to develop light composites with properties of technological interest by using elastomers of different polarities. This was achieved by employing cellulose II, in the powder form, as filler in natural rubber (NR and chloroprene (CR. Cellulose II was obtained by coagulation of cellulose xanthate solution, in acid medium, under stirring and at room temperature, which represents, to our knowledge, a new way of obtaining this type of filler. Composites with 10phr of cellulose II and NR or CR were prepared having the particle size as variable. The mechanical properties and the microscopic aspect of the different composites were evaluated and compared with compounds without filler. The results indicated best results for the CR composite, influenced by the polarity of the elastomeric matrix and by the particle size, as a consequence of the milling conditions of the filler used.

  7. Propriedades Mecânicas e Dinâmico-mecânicas de Composições de Policloropreno com Negro de Fumo Mechanical and Dynamic Mechanical Properties of Chloroprene Rubber Compositions with Carbon Black

    Agnes F. Martins


    Full Text Available As cargas são fundamentais em composições elastoméricas sendo classificadas, segundo desempenho mecânico, em reforçadoras ou não. O negro de fumo é a carga de reforço mais utilizada nessas composições, não só pelas excelentes propriedades que confere ao artefato, mas também pelo baixo preço e facilidade de processamento. As propriedades dinâmico-mecânicas de sistemas poliméricos são modificadas pela adição de cargas, o que acarreta mudanças nos módulos elástico (E' e viscoso (E", bem como na razão entre eles, isto é, a tangente de perda (tan delta. Neste trabalho, são estudadas as propriedades mecânicas e dinâmico-mecânicas de composições de policloropreno (CR com negro de fumo (NF. O teor de negro de fumo incorporado variou entre 0 e 45 phr. A composição contendo 40 phr de carga apresentou o melhor conjunto das propriedades estudadas.Often used in elastomeric compositions, fillers can be classified, according to their mechanical performance, as reinforcing or non-reinforcing fillers. Carbon black is the most used reinforcing filler in rubber compositions, either because of the excellent properties it confers to the rubber article, or due to its low cost and easy processing. When added to polymer systems, fillers are known to cause a considerable change in both dynamic moduli, viscous (E" and elastic (E', and also in the loss factor (tan delta, which is the ratio between those two parameters. In this work, the mechanical and dynamic mechanical properties of compositions of chloroprene rubber (CR with carbon black (CB were investigated. The filler content varied from 0 to 45 phr. The composition containing 40 phr of carbon black showed the best set of results.

  8. 氯丁橡胶胶黏剂对多层胶合板韧性的影响%Effects of Chloroprene Rubber Adhesive on Impact Toughness of Multi-Layer Plywood

    连海兰; 赵丽艳; 程明娟


    The impact toughness of multi-layer plywood was improved by the mixtures of urea formaldehyde resin ( UF) and chloroprene rubber adhesive ( CR) in wood industry. The effects of the ratio of CR to UF (0/6, 1/5, and 2/4) , lay-up structure (UF313, CR151, and UF511) and load direction (UF61 , CR16, UF511, and CR115 ) on the mechanical properties were studied. Results showed that the impact strength of multi-layer plywood increased with increasing content of CR, while the emission of formaldehyde from plywood reduced. However, the addition of CR could decrease the bonding strength and bending properties. The multi-layer plywood had the optimum mechanical strength when CR was applied to tensile load, and UF to compress load.%采用木材工业常用的脲醛树脂(UF)胶黏剂和氯丁橡胶(CR)胶黏剂复合压制多层胶合板,用以改善胶合板的冲击韧性.主要探讨在7层胶合板中不同的CR与UF比例(CR、UF胶层比分别为0/6,1/5和2/4),相同CR与UF比例时(2/4),CR胶在板材结构中所处位置的不同(UF313,CR151和UF511)以及不同受力状态(UF61和CR16,UF511和CR115)等对多层胶合板性能的影响.结果表明:使用CR胶可以提高胶合板的冲击强度,同时能降低板材的甲醛释放量,且CR胶用量越大,板材的冲击强度越高,甲醛释放量越低,但对板材的胶合强度和弯曲性能则有负面影响.将CR胶层侧作为板材的拉伸面,UF胶层侧作为受压面,有利于充分发挥两种胶黏剂各自的优势,使复合板材的性能达到最佳.

  9. Effect of DB-MgO Crosslinking System on Properties for Poly(vinyl chloride)/Chloroprene Rubber Thermoplastic Elastomer%DB-MgO交联体系对PVC/CR共混型热塑性弹性体性能的影响

    张莉琼; 涂志刚; 刘晓艳; 赵素芬; 李彭


    With the use of 2-dibutylamino-4,6-dithiol-s-triazine(DB) which was synthesized by homemade,the poly(vinyl chloride)/chloroprene rubber thermoplastic elastomer(PVC/CR-TPE) could be synthesized.The crosslinking characteristics of PVC and CR,rubber and plastic ratio,crosslinking agent dosage on the properties of materials influence was investigated.The results showed that crosslinking agent DB could make PVC and CR produce common cross-linking effect,the compatibility of the two was improved and the good performance of PVC/CR-TPE was prepared.The optimal rubber and plastic ratio of PVC/ CR was 25/75,crosslinking agent was 2-3 copies.%使用自制交联剂2-二正丁基胺基4,6-二硫醇均三嗪(DB)制备了热塑性弹性体PVC/CR,并对用DB交联PVC、CR共聚物的交联特性、橡塑比、交联剂用量对材料的性能影响进行了考察,结果表明:由于共交联剂DB能使PVC与CR产生共交联作用,改善了两者的相容性,可以制备性能良好的PVC/CR-TPE.最优橡塑比PVC/CR以25/75左右为宜,交联剂用量以2~3份为宜.

  10. Preparation of powdered adhesiVe type chloroprene rubber

    朱家顺; 王炼石; 梁启浩


    研究了包覆剂对黏接型氯丁胶乳(CR 244)包覆性能的影响,并通过扫描电子显微镜研究了所得粉末橡胶的微观结构.结果表明,包覆剂用量大于15份(质量)时,粒径不大于0.9 mm的试样质量分数大于99%.粉末CR 244中存在许多孔洞,使得试样易于干燥和溶解.

  11. 环保型氯丁胶粘剂%Environmental Protection Chloroprene Adhesive

    李广宇; 何红波; 于敏; 李子东



  12. 某氯丁橡胶厂氯丁二烯无组织排放情况调查%Investigation on Fugitive Emission of Chloroprene in a Chloroprene Rubber Plant

    邹立海; 孔凡玲; 隋少峰; 张华东; 周敏


    [目的]了解氯丁橡胶厂氯丁二烯无组织排放情况,提出修订卫生防护距离标准目的 建议.[方法]2010年3月11~12日,在重庆市长寿区某公司对氯J橡胶生产装置进行调查和监测,采用地面浓度反推法估算该厂氯丁二烯无组织排放量.[结果]该厂年生产氯丁橡胶30 000 t,氯丁二烯无组织排放量为8.32 kg/h,相当于生产1 t氯丁橡胶排放2.43 kg,其卫生防护距离理论计算值为1754 m.[结论]生产规模30000t目的 氯丁橡胶厂最小风速下卫生防护距离建议为1800 m.

  13. Chloroprene rubber-based adhesive formula with low toxicity%低毒型氯丁胶配方

    胡维甫; 杨晓文; 张平君


    @@ 1低毒氯丁胶制备工艺 氯丁胶的毒性主要来自溶剂,特别是传统的苯类溶剂,其毒性更大.降低毒性首先从减少混合溶剂中苯类溶剂开始.经试验,确定了以下溶剂.

  14. 氯丁橡胶中组分含量分析%Determination of Composition in Chloroprene Rubber

    周淑华; 刘懿莉; 周志诚; 王进



  15. 氯丁橡胶热老化性能的研究%Study on heat ageing of chloroprene rubber

    姚印华; 黄瑞民; 高超锋


    研究了生胶品种、硫化体系、防护体系等对氯丁胶料热老化性能的影响.结果表明,CR232氯丁橡胶具有较好的耐老化及压缩变形性,NA-22的用量为0.5 份时,可获得最佳的耐热及焦烧性能的硫化胶.

  16. Application of vulcanized chloroprene rubber particulate%氯丁橡胶硫化胶粉的应用

    段敏; 谭义阳; 李荣早; 赫俊



  17. Application of cation chloroprene latex cement mortar%阳离子氯丁胶乳水泥砂浆的应用与施工




  18. 氯丁橡胶热分解动力学研究%Study on the thermal degradation kinetics of chloroprene rubber

    杨性坤; 胡付欣


    对国产和进口氯丁橡胶(CR)热分解动力学进行研究,结果表明,CR的热降解过程分3步进行,N2气氛下的明显起始分解温度为260 ℃,推得热分解反应级数为一级,热分解反应活化能为148 kJ·mol-1,分解反应的频率因子为2×10-11.

  19. 氯丁胶乳乳化沥青稀浆封层的初探%The Study on Chloroprene Rubber Latex Emulsified Bitumen Slurry Seal




  20. Overview of studies on human health damage caused by chloroprene%氯丁二烯对人体健康损害研究概况

    胡训军; 李思惠



  1. 抗氧剂TNP在氯丁橡胶中的应用%Application of Phosphite Ester Antioxidants to Chloroprene Rubber




  2. Preparation of powdered CR244 adhesive type chloroprene rubber%CR244粘接型粉末氯丁橡胶的制备

    朱家顺; 王炼石; 梁启浩



  3. 过氧化物硫化氯丁橡胶的研究%Study on Chloroprene Rubber cured with Peroxide

    陈焜盛; 罗权焜



  4. The effect of nano particle in the chloroprene rubber%纳米粒子在氯丁橡胶中的作用

    魏元生; 汪艳; 戚欢



  5. 三元接枝改性氯丁橡胶胶粘剂的研究%Study on Ternary Graft Modification Chloroprene Rubber Adhesive

    李璐; 王晓立; 丁保宏


    氯丁橡胶(CR)、甲基丙烯酸甲酯(MMA)和丙烯酸(AA) 在低毒溶剂中接枝成胶.研究合成的反应温度、反应时间、引发剂的用量、第一单体(MMA)的用量及溶剂的选择和投料的方式对接枝共聚反应黏度和固含量的影响,确定了最佳反应条件和配方组成.

  6. Application of Scorch Retarder P-X in Chloroprene Rubber Production%防焦剂P-X在氯丁橡胶生产中的应用




  7. Application of Sericite Powders on Chloroprene Rubber%绢云母微粉在氯丁胶中应用技术研究

    张银年; 田敏; 郭保万; 李洪潮



  8. GMA改性耐黄变强力接枝胶的研制%Synthesis of powerful and anti-yellowing grafted chloroprene adhesive modified with GMA




  9. 接枝氯丁橡胶热分解动力学研究%Study on the thermal degradation kinetics of grafted chloroprene rubber

    胡付欣; 张永萍



  10. Synthesis of powenful and polymolecular grafted chloroprene rubbor adhesive%强力多元接枝氯丁胶的研制




  11. Study on grafted chloroprene rubber adhesives of environmental benefits%环保型接枝氯丁胶的研究

    朱军; 龚巍华; 潘文玲


    以氯丁橡胶DCR-10,甲基丙烯酸甲酯为主料,在甲苯/甲乙酮混合溶剂中,通过引发剂过氧化二苯甲酰,先接枝共聚生成高粘度的接枝共聚物,再用120#汽油稀释,并加入萜烯酚醛树脂.讨论了原料配比、聚合工艺对接枝氯丁胶性能的影响.使用上述方法制成接枝氯丁胶粘剂中有害物质限量完全达到GB 19340-2003国家标准.


    张一甫; 谭淑珍



  13. Improvement of the shade of chloroprene rubber solution%粘接型氯丁橡胶胶液色泽的改进

    杨素芬; 彭瑞彬



  14. Determination of chloroprene in drinking water by headspace gas chromatography%顶空气相色谱法测定水中氯丁二烯

    王月红; 潘小萍; 鄢敏林



  15. 氯丁胶粘剂中溶剂的危害的探讨%Harm of Solvent Vapor in Chloroprene Rubber Adhesives




  16. 溴化氯丁橡胶中溴含量的测定%Determination of Bromine Content in the Brominated Chloroprene rubber

    曾凤娟; 鲁万卿; 魏金桥; 杨松强



  17. Current situation and development trend of chloroprene rubber adhesives%氯丁胶粘剂的现状与发展趋势

    李子东; 李广宇; 孟瑶; 李春惠



  18. 阻燃氯丁橡胶的无焰燃烧与阻燃性能%Flameless combustion and flame retardant properties of retardant chloroprene rubber

    李森; 李洪成; 周兵; 李荣勋


    将十溴二苯乙烷(DBDPE)、成碳剂(CTJ)、化学膨胀剂(IFR)复配阻燃氯丁橡胶,利用氧指数(LOI)和锥形量热仪(CONE)探讨了十溴二苯乙烷与CTJ、IFR复配阻燃氯丁橡胶的协同效应,通过扫描电镜研究表征样品的断面形貌.结果表明,当三者共用15份,且DBDPE∶CTJ∶IFR比例为7∶2∶6时,阻燃CR体系的无焰燃烧时间为7 s,同时LOI达到了40%,热释放速率只有纯CR的11.4%,生烟速率为纯CR的30.8%,表现出一定的协同作用;从样品燃烧后的断面扫描电镜照片看出,兼有了物理成炭和化学成炭的优点,提高了阻燃性能.

  19. 梯矩形立体连续传质塔板在氯丁二烯精馏塔中的应用%The application of LLC-Tray in the chloroprene distillation

    丁少峰; 陆丁丁; 张红卫; 杜佩衡


    氯丁橡胶生产中氯丁二烯(CP)单体的纯度直接影响产品质量,且氯丁二烯在精馏过程中易自聚而堵塞塔盘,采用梯矩形立体连续传质塔板(LLC-Tray)对旧塔(穿流筛板塔)进行改造后性能优异,高沸物含量由1 000ppm降至200ppm以下,全塔压降约降低5kPa,处理量增加30%以上,且无自聚堵塞塔盘的现象.本文对LLC-Tray的结构、操作原理及在氯丁二烯精馏塔中应用进行了详细介绍,该技术在氯丁橡胶行业应用前景广阔.

  20. The Feasibility for the Project of Introducing 25 kt/a Butadiene - Based Chloroprene Rubber (CR) Plant%引进25 kt/a丁二烯法氯丁橡胶(CR)项目可行性探讨



    The project of introducing 25 kt/a butadiene - based CR plant is to the advantage of any chloro - alkali enterprise at or near a petrochemical complex. But the introduction of the technology for CR is a key for the project, then the success of the project is entirely dependent on whether marketable and high - tech grades for CR to be produced.%上25 kt/a CR新项目对石化厂或靠近石化厂的氯碱企业有利;但技术引进难度高,引进后能否生产出适销对路且技术含量高的CR品种,决定项目的前途。

  1. Determination of Chloroprene in Surface Water by Purge and Trap-GC/MS%吹扫捕集-气相色谱/质谱联用法测定地表水中氯丁二烯

    王荟; 李娟; 章勇


    采用吹扫捕集-气相色谱/质谱联用法测定地表水中氯丁二烯.当进样体积为20 mL时,方法在0.100μg/L~50.0 μg/L范围内线性良好,检出限为0.05μg/L,标准溶液平行测定的RSD≤3.7%,地表水样加标回收率为91.0%~101%,方法可用于地表水中卤代烃、苯系物等其他21种挥发性有机物的同时测定.

  2. 立体连续传质塔板在氯丁二烯精馏中的应用%Application of Three-dimensional Spraying Continuous Mass-transfer Tray in Chloroprene Rectification



    介绍了立体连续传质塔板的结构、原理、特性,并经设计后应用于氯丁二烯-二氯丁烯精馏过程中.改进后的精馏塔,塔顶和塔底高沸物二氯丁烯的质量分数分别降为0.14×10-3~16×10-3和1%~3%,最高产量达2.175 m3/h,塔板压降减小为10 kPa,且操作弹性大、防自聚能力好、传质效率高、能耗低.优于传统的筛板塔.

  3. 船用电缆用低烟低卤阻燃氯丁橡皮护套研究%Research on the formulation of the low smoke and low halogen chloroprene rubber sheathing compound for shipboard cable




  4. Preparation of water-borne polyurethane-chloroprene hybrID latex%水性聚氨酯-氯丁二烯杂化胶乳的制备

    张雯; 袁荞龙; 马东柱; 郝喜庆



  5. Effect of added methyl acrylate on the polymerization of carboxylic chloroprene emulsion%丙烯酸甲酯对羧基氯丁胶乳聚合体系的影响

    李德永; 石艳; 付志峰



  6. Application of dimethyl carbonate in chloroprene rubber and SBS based adhesives%碳酸二甲酯在氯丁和SBS型胶粘剂中的应用



    @@ 1 前言 自GB18583-2001强制性国家标准实施以后,氯丁胶粘剂绝对禁用苯溶剂,甲苯也被限制使用(每吨胶液中甲苯含量小于200 kg),但是对同样有毒的氯化溶剂没有限制,致使具有相当大毒性并会破坏大气臭氢层的二氯乙烷被滥用.

  7. 硝酸腐蚀条件下公路桥梁氯丁橡胶支座抗剪试验%Shearing Tests of Plain Chloroprene Rubber Bearings of Highway Bridge under Acid Corrosion Condition

    司月华; 王桂玲; 刘铭


    本研究将氯丁橡胶支座完全浸泡在pH为4.5的硝酸溶液中,对5组试件分别浸泡20d、40d、60d、80d、100d,将浸泡试件与标准件进行抗剪试验,将腐蚀试件与标准件的抗剪承载力、极限抗剪强度、水平等效刚度、抗剪弹性模量的数据进行对比分析,结果表明,氯丁橡胶支座在硝酸溶液浸泡后,其抗剪弹性阶段明显缩短,破坏程度更严重;从数据分析得,浸泡天数越多,其抗剪承载力、极限抗剪强度、抗剪弹性模量越小.%The neoprene bearings are completely soaked in nitric acid solution with pH=4.5, the five groups of speci-mens are soaked respectively for 20 d, 40 d, 60 d, 80 d, 80 d, thesoaked specimen andstandard partsare arried out with shear test.The data of shear bearing capacity,ultimate shear strength, equivalent stiffness and shear modulus of elasticity for the corrosion specimens are compared and analyzed with thoseof standard parts.The results show that af-ter soaking in nitric acid solution,neoprene bearing has significantly reduced shear elastic stage, and more serious damage. From the data analysis, it can be obtained that the more days it is soaked, itsshear bearing capacity, ultimate shear strength, shear elastic modulus become smaller .

  8. 浅谈氯丁胶乳防水砂浆在地铁工程中的应用%Discusses Chloroprene Liquid Rubber Waterproof Mortar Shallowly in the Subway Project Application




  9. 电石法氯丁橡胶的生产工艺与技术经济分析%Production process of chloroprene rubber via calcium carbide route and techno-economic analysis

    唐勇; 邓科; 张定明




    王成国; 王瑞华



  11. On recycling of sewage advanced treatment of chloroprene rubber sewage plant and its application fruit%氯丁橡胶污水厂污水深度处理回用与应用成果

    邢国强; 杨云龙



  12. Influence of Ultrasonic Vibrations on the Static Friction Characteristics of a Rubber/Aluminum Couple

    A novel ultrasonic vibration approach is introduced into a chloroprene rubber/aluminum friction couple for improving the static friction properties between rubber and metal. Compared to the test results without vibrations, the static friction force of a chloroprene rubber/aluminum couple decreases observably, leading to the ultimate displacement of rubber. The values of the static friction force and ultimate displacement can be ultimately reduced to 23.1% and 50% of those without ultrasonic vibrations, respectively. (fundamental areas of phenomenology(including applications))

  13. Application and computer simulation of trapezoidal-rectangular three-dimensional spraying continuous mass-transfer tray in chloroprene distillation%梯矩形立体连续传质塔板在氯丁二烯精馏中的应用和计算机模拟

    陈耘; 张阜东



  14. Influence factors on thermal aging resistance of unsaturated polyether polyurethane rubber/chloroprene rubber blends%不饱和聚醚型聚氨酯橡胶/氯丁橡胶共混物耐热老化性能的影响因素

    邓华; 陈焜盛; 罗权焜



  15. Environmental tests of electric cables for nuclear power plants

    The evaluation of the materials for flame retardation of cables for nuclear power plants and the tests of their environmental resistivity are reported. Several cables to meet the severe requirements for these cables have been produced for trial, which have been subjected to the simulated environment test including Loss of Coolant Accident. The results are summarized as follows: (a) the ethylene-proylene rubber-insulated, chloroprene-sheathed cable has the sufficient properties to use in BWR containment vessels, such as radiation resistance and flame resistance. (b) It is the same in the chloroprene-sheathed cable, that has glass braids on the outermost layer and around each core, and the insulation layer of the silicone rubber electrically stable but mechanically low in radiation resistivity. (c) The flame-resistant cross-linking polyethylene-insulated, low hydrochloric acid vinyl-sheathed cable is usable near but outside BWR containment vessels. (d) The flame-resistant cross-linking polyethylene-insulated, chloroprene-sheathed cable having the insulating layer of polyethylene for each core can be used in PWR containment vessels. (e) Chloroprene and polyvinyl chloride, the flame-resistant sheath materials, deteriorate owing to heat aging alone. Only the insulating layers mainly contribute to the environmental resistivity of cables. (f) The environmental conditions are severer when heat aging is carried out prior to irradiation. The influence of dose rate is rather little. (Wakatsuki, Y.)

  16. Influence of Ultrasonic Vibrations on the Static Friction Characteristics of a Rubber/Aluminum Couple

    程廷海; 高焓; 包钢


    A novel ultrasonic vibration approach is introduced into a chloroprene rubber/aluminum friction couple for improving the static friction properties betwesn rubber and metal.Compared to the test results without vibrations,the static friction force of a chloroprene rubber/aluminum couple decreases observably,leading to the ultimate displacement of rubber.The values of the static friction force and ultimate displacement can be ultimately reduced to 23.1% and 50% of those without ultrasonic vibrations,respectively.%A novel ultrasonic vibration approach is introduced into a chioroprene rubber/aluminum friction couple for improving the static friction properties between rubber and metal. Compared to the test results without vibrations, the static friction force of a chioroprene rubber/aluminum couple decreases observably, leading to the ultimate displacement of rubber. The values of the static friction force and ultimate displacement can be ultimately reduced to 23.1% and 50% of those without ultrasonic vibrations, respectively.

  17. 商务部公告氯丁橡胶反倾销期终复审裁定


    据商务部消息:2010年5月9日,应国内氯丁橡胶产业申请,商务部公告决定对原产于日本、美国和欧盟的进口氯丁橡胶(英文名称:Chloroprene Rubber)所适用的反倾销措施进行期终复审调查。

  18. [Preliminaries to a study of epidemiology of occupational cancer among workers of shoe factories].

    Mironov, A I; Shan'gina, O V; Bul'bulian, M A


    Data presented in literature proves frequent malignancies of various localizations in workers engaged into footwear production, which could result from exposure to leather, rubber dust and some chemicals (polyvinylchloride, chloroprene and others). Hygienic studies of air at footwear production demonstrate that the workers at their workplaces are exposed to such occupational hazards as dust, chemicals. Epidemiologic research to reveal possible correlation between work conditions and the workers' health are expedient. PMID:7881862

  19. Evaluation of an artificial intelligence program for estimating occupational exposures.

    Johnston, Karen L; Phillips, Margaret L; Esmen, Nurtan A; Hall, Thomas A


    Estimation and Assessment of Substance Exposure (EASE) is an artificial intelligence program developed by UK's Health and Safety Executive to assess exposure. EASE computes estimated airborne concentrations based on a substance's vapor pressure and the types of controls in the work area. Though EASE is intended only to make broad predictions of exposure from occupational environments, some occupational hygienists might attempt to use EASE for individual exposure characterizations. This study investigated whether EASE would accurately predict actual sampling results from a chemical manufacturing process. Personal breathing zone time-weighted average (TWA) monitoring data for two volatile organic chemicals--a common solvent (toluene) and a specialty monomer (chloroprene)--present in this manufacturing process were compared to EASE-generated estimates. EASE-estimated concentrations for specific tasks were weighted by task durations reported in the monitoring record to yield TWA estimates from EASE that could be directly compared to the measured TWA data. Two hundred and six chloroprene and toluene full-shift personal samples were selected from eight areas of this manufacturing process. The Spearman correlation between EASE TWA estimates and measured TWA values was 0.55 for chloroprene and 0.44 for toluene, indicating moderate predictive values for both compounds. For toluene, the interquartile range of EASE estimates at least partially overlapped the interquartile range of the measured data distributions in all process areas. The interquartile range of EASE estimates for chloroprene fell above the interquartile range of the measured data distributions in one process area, partially overlapped the third quartile of the measured data in five process areas and fell within the interquartile range in two process areas. EASE is not a substitute for actual exposure monitoring. However, EASE can be used in conditions that cannot otherwise be sampled and in preliminary

  20. Study on NR/CR Blends Technology%NR/CR并用胶共混性能研究

    黄庆; 白健


    Natural rubber and chloroprene rubber blends technology was developed and the effect of ratio between NR/CR on the property of the rubber was studied. The results showed that natural rubber and chloroprene rubber blends has the better mechanical properties. With more natural rubber in composition, the blend cures fast, and the flame resistance and weather aging performances of the rubber are poor,while with more chloroprene rubber in composition solvent resistance and flame resistance of the rubber are better.%研究了天然橡胶和氯丁橡胶的共混工艺,并研究了NR/CR二者之间并用比例对并用胶性能的影响.结果显示,天然橡胶和氯丁橡胶分别加填料混炼均匀后再共混在一起,共混胶的各项物理力学性能较好,并用胶组成中,天然橡胶比重大时,硫化速度较快,但耐天候老化及阻燃性差.氯丁橡胶比重大时,耐溶剂性和阻燃性较好.

  1. Incineration technology of plutonium contaminated solid waste generated from MOX fuel fabrication facilities

    Plutonium-contaminated solid wastes have been generated during MOX fuel fabrication in the Japan Atomic Energy Agency (JAEA). Chlorine contained solid wastes such as PVC bags and chloroprene rubber gloves have been steadily generated because MOX fuel fabrication equipments are installed in glove boxes. Incinerations of chlorinated wastes cause the problems such as corrosion of the equipments and dust load against the exhaust system. The JAEA had designed and manufactured a new type incineration system for chlorine contained wastes and combustible wastes based on past experience gained by the operation of the Plutonium contaminated Waste Treatment Facility (PWTF) to solve the problems. (author)

  2. Surface modification of synthetic rubbers by UV, ion-etching, and low energy EB irradiation

    Surface modification processing of two kinds of synthetic rubbers (ethylene-propylene, and chloroprene) by ultraviolet (UV), sputter ion etching, and electron beam (EB) irradiation treatments has been studied in relation to the modification mechanisms. The most remarkable effect of these treatments was (1) the rapid increase of adhesion properties and (2) simultaneously decrease of self-stickiness. This non-sticking effect was particularly important for the rapid production of thin rubber sheet articles. The effectiveness was in the following order: ion etching>UV>EB. The surface modification mechanism was studied by use of SEM, ESCA, FT-IR, and related interfacial analytical procedures

  3. Degradation mechanisms of organic rubber and glass flake/vinyl ester linings in flue gas desulphurization plants

    Weber, R. [Allianz-Centre for Technology GmbH, Ismaning (Germany)


    In recent years, there have been reports in numerous publications about damage to rubber and glass flake coatings in flue gas desulphurization plants. The pattern of damage has been described and attempts have frequently been made to determine and explain the cause of the damage. Oxidation/hydrolytic changes were generally observed as the damage mechanisms. In addition, blistering occurs in both the chloroprene coatings in the absorbers and in the glass flake coatings in clean gas ducts. This blistering may be considered as the end of the useful life and leads to cost-intensive and time-intensive repair and restoration measures. The present state of knowledge suggests that the blistering is mainly due to osmotic processes preceded by permeation processes and with permeation processes superimposed on them. Among other things, the reports describe the permeation behaviour of water and other flue gas constituents; the blistering in chloroprene rubber coatings and glass flake coatings is explained by means of the knowledge gained. (au) 16 refs.

  4. Accelerated radiation aging of polymer materials by γ-irradiation in oxygen under pressure

    As an accelerated test of radiation aging of polymer materials at low level radiation environment, the degradation of various polymer materials for electric cable insulation was studied by Co-60 γ-ray irradiation in oxygen under pressure at high dose rate. By this method, the oxidation induced by radiation proceeded throughout the specimens in the same way as at irradiation at low dose rate. The degradation was found to be nearly the same as obtained by the long-term radiation aging at 5 krad/h in air for specially formulated materials. In the combination of radiation-thermal aging, the synergistic effect was remarkable when the sequential aging of radiation oxidation followed by thermal aging was carried out. The tested polymers were polyethylene, ethylene-propylene-diene rubber, chloroprene rubber (Neoprene) and chlorosulfonated polyethylene (Hypalon)

  5. Progress on qualification testing methodology study of electric cables

    Sequential testing methodologies were discussed by examining amount of oxygen consumed in organic materials in simultaneous and sequential environments of heat and irradiation, effects of pre-conditioning methods on degradation of material and test conditions on water sorption of materials in steam/spray environments of simulated LOCA in order to assure the validity of the short term sequential method for qualification of electric wires and cables for nuclear uses. The degradation behavior of various jacketing and insulation materials such as chloro-sulfonated polyethylene, ethylene-propylene rubber, cross-linked polyethylene, chloroprene, and silicone rubber were investigated. From these experimental results, it is concluded that the irradiation conditions such as sequential ordering of irradiation and thermal aging, dose rate and irradiation temperature, and presence of air in the LOCA stream/spray environments are important factors in the qualification testing methodology. 22 figures

  6. Application of intumescent flame retardant in rubber%膨胀型阻燃剂在橡胶中的应用

    杨娜; 王雪飞; 王进


    The composition and functional modification of intumescent flame retardant were introduced briefly, and an overview of the application of intumescent flame retardant in natural rubber, ethyl-ene-propylene-diene monomer, styrene-butadiene rubber and chloroprene rubber was presented with 26 references, the developing trend of the flame retardant were proposed.%介绍了膨胀型阻燃剂的组成及功能改进,总结了膨胀型阻燃剂在天然橡胶、三元乙丙橡胶、丁苯橡胶及氯丁橡胶中的应用进展,并对膨胀型阻燃剂的发展方向做了展望.

  7. 镍转鼓表面处理磨光机的优化设计及制造%The Optimization Design and Manufacture of Nickel Drum Surface Treatment Polishing Machine

    罗耿波; 耿建; 孙振华


    The research of polishing machine is to solve the pitting issue on the surface of frozen nickel drum in the production line of chloroprene rubber and to increase its output. Through selecting proper grinding materials and improving the polishing machine, solves the existing problems with manual polishing and enhances the maintenance efficiency of the drum.%研制磨光机是为了解决氯丁橡胶生产线上冷冻镍转鼓表面的点蚀问题,从而提高氯丁橡胶的产量。通过选用适当的磨削材料并对磨光机进行改进,解决了手工磨光存在的问题,提高了转鼓的维修效率。

  8. Reviews of environmental contamination and toxicology

    Ware, G. (ed.)


    Review of Environmental Contamination and Toxicology attempts to provide concise, critical reviews of timely advances, philosophy and significant areas of accomplished or needed endeavour in the total field of xenobiotics, in any segment of the environment, as well as toxicological implications. This edition contains a paper 'Health effects of arsenic, fluorine and selenium from indoor burning of Chinese coal, by Liu Guijian, Zheng Liugen, Nurdan S. Duzgoren-Aydin, Gao Lianfen, Liu Junhua, and Peng Zicheng. Other papers are: Chemistry and fate of simazine; Ethanol production: energy, economic, and environmental losses; Arsenic behaviour from groundwater and soil to crops: impacts on agriculture and food safety; Mercury content of hair in different populations relative to fish consumption; and Toxicology of 1,3-butadiene, chloroprene, and isoprene. 15 ills.

  9. Oxidation of 1,4-dichloro-2-butene by aqueous sodium hypochlorite under phase transfer conditions

    Grigoryan, G.S.; Karoyan, I.L.; Malkhasyan, A.Ts.; Martirosyan, G.T.; Artamkina, G.A.; Beletskaya, I.P.


    In the industrial process for the production of chloroprene from butadiene, the problem of reducing the organic impurities in the waste water to 2000 mg/liter has not yet been solved. A method has been patented for the oxidation of organic compounds by sodium hypochlorite at high temperatures and high pressure but this method is limited by the oxidation of soluble organic compounds. The oxidation of 1,4-dichloro-2-butene by aqueous sodium hypochlorite was studied. A sharp increase in the reaction rate was found in the presence of phase transfer catalysts and surfactants. The involvement of oxygen as a cooxiant and the effect of surfactants on the absorption of atmospheric oxygen by the reaction system were demonstrated.

  10. Acid digestion of chlorine-containing wastes, (2)

    In the Plutonium Fuel Fabrication Facility, about 40% of the alpha-contaminated solid wastes contains organic chlorides, mainly PVC sheets and chloroprene rubber gloves. Acid digestion has been developed to reduce the volume of alpha-contaminated wastes, while converting the wastes into stable nonreactive residue. Based on the results of the basic studies on the acid digestion for nonradioactive chlorine-containing wastes, a non-radioactive pilot plant equipped with a 200 l digester was designed and constructed to confirm the performance in scaled-up process and the engineering problems. The following matters are described: the pilot plant of nonradioactive acid digestion and the experiments performed with it to confirm the reproducibility of the results of basic studies and to verify the safety of the processes. Many useful results were able to be obtained for the nitric acid oxidation processes. (J.P.N.)

  11. 汽车用橡胶减震材料新型环保配方研究%Study on the Formula of new Environmental Protection Rubber Damping Material for Automobile



    笔者研究了氯丁橡胶、三元乙丙橡胶共混胶:防老剂4020、防老剂RD、防老剂NBC,硫化促进剂TATD在橡胶减震材料中的应用,从经济环保的角度进行了新的配方设计,并进行了性能(邵尔A型硬度、拉伸强度、扯断伸长率、老化系数和耐久性)测试。通过对实验结果分析,确定氯丁橡胶、三元乙丙橡胶共混胶的在橡胶减震材料配方的壤佳比例及防老刑4020、防老荆RD、防老剂NBC的优化配伍比例。通过对比实验.结果表明:问等条件下,生产相同的橡胶减震材料产晶,使用硫化促进剂TATD的制品综合性能要优于使用硫化促进剂TMTD的制品.且用量少。%The author studied the application of chloroprene rubber, ethylene propylene diene monomer (EPDM) rubber blends, antioxidant 4020, antioxidant RD, antioxidant NBC and vulcanization accelerator TATD in the rubber damping material product, made the new formulation design from the economic and environmental protection angle, and tested properties (Shore A hardness, tensile strength, elongation at break, aging coeffcient and durability). The author through the analysis of experimental results, found out the best proportion of chloroprene rubber and EPDM rubber in the rubber damping material formula. The author also found out the optimized compatibility proportion of antioxidant 4020, anti0xidant RD and antioxidant NBC in the formula. By comparing the experimental results, the properties use vulcanization accelerator TATD were better than which use vulcanization accelerator TMTD in the same conditions producing rubber damping material. Also the used quantity was less.

  12. Development of cables for nuclear power generating station

    Results of LOCA simulation test and vertical tray combustion test of cables for nuclear power plant are reported. Radiation resistance of polyethylene, crosslinked polyethylene and ethylene-propylene (EP) rubber was tested. The crosslinked polyethylene and the ethylene-propylene rubber showed a good resistance. The first step heat aging temperature was determined as 1500C-3 days for 800C-40 years of ethylene-propylene rubber by Arrhenius's method in the case of PWR, and determined by the method specified in IPCEA-S-66-524 in the case of BWR. The irradiation test was performed at about 0.7 x 106 Rad/hr with Co-60 gamma radiations. Deterioration of elongation of EP rubber, flame retarded EP rubber and silicon rubber after irradiation in the test of PWR was very large, but they could resist to bending test, so there seemed no problem for practical use. Silicon rubber for sheath cracked at bending test. Flame retarded chlorosulfonpolyethylene showed better characteristics than the flame retarded chloroprene rubber. In the vertical tray test, the conventional cables burned after 5 to 6 minutes, but the flame retarded cables was not burned. In the LOCA test, a simultaneous testing of both irradiation and high temperature-high pressure exposure is desired. (Iwakiri, K.)

  13. Microwave Absorption Properties of Double-Layer RADAR Absorbing Materials Based on Doped Barium Hexaferrite/TiO2/Conducting Carbon Black

    Sukanta Das


    Full Text Available In this report, we demonstrate microwave absorption properties of barium hexaferrite, doped barium hexaferrite, titanium dioxide and conducting carbon black based RADAR absorbing material for stealth application. Double-layer absorbers are prepared with a top layer consisting of 30% hexaferrite and 10% titanium dioxide while the bottom layer composed of 30% hexaferrite and 10% conducting carbon black, embedded in chloroprene matrix. The top and bottom layers are prepared as impedance matching layer and conducting layer, respectively, with a total thickness of 2 mm. Microwave absorption properties of all the composites were analyzed in X-band region. Maximum reflection loss of −32 dB at 10.64 GHz was observed for barium hexaferrite based double-layer absorber whereas for doped barium hexaferrite based absorber the reflection loss was found to be −29.56 dB at 11.7 GHz. A consistence reflection loss value (>−24 dB was observed for doped barium hexaferrite based RADAR absorbing materials within the entire bandwidth.

  14. Adesivos poliméricos à base de SBR: influência de diferentes tipos de agentes promotores de adesão SBR-based polymeric adhesives: influence of different types of adhesion promoting agents

    Mauro E. C. B. Pinto


    Full Text Available Neste trabalho, foi desenvolvido um novo adesivo não estrutural à base de copolímero de SBR com alto teor em estireno (SBR-53. O objetivo deste novo produto é avaliar a possibilidade de sua utilização no segmento moveleiro, em substituição ao adesivo de policloropreno (CR-M, cujo polímero-base é importado. Diferentes formulações de adesivos foram desenvolvidas, específicas para a indústria moveleira, e o desempenho do elastômero SBR-53 foi comparado ao dos elastômeros SBR-23 comercial (SBR tradicional - baixo teor de estireno e CR-M, quanto à estabilidade em solução, viscosidade e propriedades mecânicas.In this work a new non-structural adhesive based on a high styrene content SBR copolymer (SBR-53 was developed. This new product is intended to be used in the furniture segment, to replace the chloroprene rubber (CR-M adhesive, whose base polymer is imported. Different adhesive formulations were developed specifically for the furniture industry, and the performance of the elastomer SBR-53 was compared to that of commercial elastomers SBR-23 (low-styrene traditional SBR and CR-M, as for solution stability, viscosity and mechanical properties.

  15. 氯丁橡胶的老化和寿命预测研究%Study on neoprene rubber aging and shelf-life predictions

    王锋; 董玉华; 郭文娟; 丁晓东; 周琼


    The thermal oxidative aging properties of neoprene at 55 ℃ ,70 ℃ ,85 ℃, 100 ℃ were determined by using accelerated aging method at laboratory. The aging mechanism of chloroprene rubber was determined by IR: thermal aging on the C = C;85 ℃ ,100 ℃ the side groups Cl was away from the main chain. The relationship between properties and aging time of neoprene was established, and predicted at 25 ℃ neoprene storage life is twenty years.%通过对氯丁橡胶在55℃、70℃、85℃、100℃下热空气加速老化的实验,研究了氯丁橡胶的老化机理并进行了寿命预测.红外分析结果说明氯丁橡胶的老化机理为:热氧老化在C=C上进行;85℃、100℃侧基Cl脱离主链.以扯断伸长率为指标进行寿命预测,可知氯丁橡胶在本实验条件下的贮存寿命约为20 a.

  16. Improvements of natural rubber for flame resistance

    Orasa Patarapaiboolchai


    Full Text Available The present invention provides a process for treating natural rubber to increase its flame retardant capability. Theprocess comprises a mixture of a natural rubber with, (a halogenated free flame retardant agent (zinc hydroxystannate;STORFLAM ZHS and (b halogenated flame retardant agent (decabromodiphenyl; Great Lake DE-83R and chlorinatedparaffins; Plastoil 152 and another material like antimony trioxide and aluminium hydroxide in appropriate amount, with ratio of halogenated flame retardant agent: antimony trioxide 3:1. In the resulting product with halogen flame retardant showed a more efficient flame retardant property than halogen free flame retardant, i.e. brominated flame retardant provide higher efficiency than chlorinated and ZHS, respectively. The minimum requirement ratio for being flame retardant of antimonytrioxide: brominated or chlorinated agent is 7:21 or 10:30 phr while aluminium hydroxide: ZHS is 10: 150 phr. It was found thatburning rate was zero for brominated and chlorinated agent used but not for zinc hydroxyl stannate system. Average time of burning (ATB was 135, 118 and 41 second for brominated, chlorinated and ZHS flame retardant, respectively. Average extent of burning (AEB was 24, 19 and 14 millimeters, respectively. An advantage of this invention is that chemicals (antimony trioxide and either brominated or chlorinated agent added to natural rubber have the effect of rendering the natural rubber flame-resistant like synthetic rubbers, chloroprene.

  17. Development of low hydrogen-chloride rubber material for nuclear power plants

    Conventional chlorosulfonated polyethylene (CSM) and chloroprene (CR) have been used as the sheath materials of cables, but these material release harmful gas such as hydrogen chloride on burning, hence the compounds of CSM and CR which release the limited amount of hydrogen chloride on burning and withstand the environmental test of various conditions have been developed. Various amounts of calcium carbonate and other additives were added to CSM and CR to prepare the compounds, and sample cables were fabricated. The generation of hydrogen chloride, oxygen index, and water swelling of the sheath materials were measured, and the sample cables were subjected to the environmental test and flame-resisting test. As the experimental results the compounds, the performance of which are shown in the following, were able to be obtained. 1) The generation of hydrogen chloride was reduced by 37 % and 43 % in CSM and CR, respectively, 2) the capability withstanding the environmental test and the flame resistivity were at the same level as those of conventional flame-resisting cables, 3) the CSM withstood the new environmental test (MSLB/LOCA combined condition). (Yoshitake, I.)

  18. Cavitation erosion of low-density polyethylene coatings for pipe liners

    Hattori, S.; Benitani, E.; Ruan, W.; Suda, Y.; Takeuchi, R.; Iwata, T.


    The relationship between mechanical properties and the erosion rate was examined for chloroprene rubber and a number of polyethylene materials produced by different methods. As electric power plants are in operation over long periods of time, the effect of aging was also examined by testing material intended for use in pipes in electric power plants. Cavitation erosion tests were carried out by using a flowing apparatus as specified in the American Society for Testing Materials G134-95 standard. A flow velocity of 150 m/s and a test time of 24hours, were the experimental conditions used for a cavitating liquid jet test on polyethylene. The maximum depth of erosion rate (MaxDER) of polyethylene was found to decrease with the increase in hardness. Among all the tested materials, the relatively high molecular weight polyethylene with low density (m-LLDPE-H), showed the best resistance to cavitation erosion in terms of MaxDER. The effect of aging on the erosion rate of polyethylene was limited.

  19. Diffusion and solubility of oxygen in γ-ray irradiated polymer insulation materials

    The effects of 60Co γ-rays irradiation on diffusion and solubility of oxygen in polymer materials for electric cable insulation materials were investigated. The polymers were polyethylene, ethylene-propylene rubber, chlorinated polyethylene, chlorosulphonated polyethylene, and chloroprene rubber. They were pure grade and several types of formulation grade. The sheets of these polymers were irradiated up to 5 - 200 Mrad under vacuum or in oxygen under pressure of 3 - 15 atm at room temperature or at 70 deg C. By a method of gas desorption, the diffusion coefficient (D) and solubility coefficient (S) of oxygen or argon in polymer materials were determined at various temperatures of 10 - 80 deg C. The D and S decreased with increase of dose, and the decrease by irradiation with oxidation was more remarkable than that by irradiation without oxidation. However, the decreases of D and S by irradiation were reduced by the formulation of polymers. The additives in formulated polymers would reduce the reactions of crosslinking or oxidation by γ-ray irradiation. The activation energy of D was scarcely changed by irradiations with and without oxidation. (author)

  20. Loss-of-coolant accident (LOCA) simulation tests on polymers: the importance of including oxygen

    Experiments were performed to survey the effects on material degradation of both aging conditions and the oxygen concentration during a LOCA simulation. Changes for a number of commercial materials commonly used as electric cable jackets and insulations in nuclear power plant applications were monitored in terms of weight, mechanical properties, solubility measurements and infrared spectroscopy. For a number of these materials (an EPR insulation, a chloroprene jacket and a PVC jacket), the concentration of oxygen during LOCA simulation was found to be an important parameter. For the first two materials, more degradation occurred when oxygen was present; for PVC, substantially increased swelling occurred as the oxygen concentration was lowered. Aging conditions were also found to have a very substantial influence. In particular, for a number of the materials, lowering the radiation dose rate used for aging led to enhanced degradation after both the aging and the LOCA simulation. The different materials examined showed very different behaviors in terms of the degradation resulting from aging and from LOCA simulation

  1. BD monomer and elastomer production processes.

    Lynch, J


    The monomer 1,3 butadiene (BD) is a product of the petrochemical industry. It is used to make several elastomers including the very high volume styrene butadiene rubber (SBR) that comprises the bulk of automobile tires. It is also used to make polybutadiene rubber that is used in parts of tires, coatings, composites and other products. The monomer can be converted to chlorobutadiene (chloroprene) and used to make polychloroprene (neoprene). BD is one of the several olefins created by cracking hydrocarbons in the presence of steam. A mixed C4 stream from the steam cracker is then sent to a BD monomer extraction unit. Modern units typically use dimethyl formamide as the extraction solvent. SBR is commonly made by the copolymerization of BD and styrene, along with various additives to control the reaction, in a water emulsion. The reaction proceeds in a continuous chain of reactors until it is 'shortstopped' by a strong reducing agent. After removing unreacted monomers from the stabilized latex, it is blended, coagulated and dewatered. The resulting dry rubber crumb is bailed, film wrapped and stored in crates. The polymerization of BD to make polybutadiene rubber can be conducted as a water suspension type polymerization similar to SBR or in a solvent system followed by solvent recovery and transfer into water suspension. PMID:11397387

  2. Contact dermatitis from a prosthesis.

    Munoz, Carla A; Gaspari, Anthony; Goldner, Ronald


    Patients wearing a prosthesis face a wide variety of medical problems. Skin complications have long been recognized, but their prevalence is still unknown. The most frequently reported disorders are allergic contact dermatitis (ACD), acroangiodermatitis, epidermoid cysts, epidermal hyperplasia, follicular hyperkeratosis, verrucous hyperplasia, bullous diseases, hyperhidrosis, infections, malignancies, and ulcerations. Contact dermatitis represents one-third of the dermatoses in amputees wearing prostheses. All patients who are suspected of having ACD should be patch tested with standard allergen series as well as materials from the patient's own prosthesis, topical medicaments, moisturizers, and cosmetics. We report a patient with an ACD to mixed dialkyl thiourea present in the rubber parts of his below-the-knee prosthesis. Thiourea derivates are used as accelerators in the manufacture of chloroprene rubber and as fixatives in photography and photocopy paper. Allergy to thiourea is relatively uncommon; different studies have shown a prevalence of 0.7% up to 2.4% in patch-tested patients. Thiourea derivates are often the allergic sources in ACD involving high-grade rubber products made of neoprene such as diving suits, protective goggles, knee braces, and continuous positive airway pressure masks. They are also present in the rubber material of prostheses, as in the case of our patient. PMID:18413115

  3. Effect of zinc oxide nanoparticles synthesized by a precipitation method on mechanical and morphological properties of the CR foam

    Rudeerat Suntako


    ZnO nanoparticles were synthesized by a precipitation method in aqueous media from zinc nitrate hexahydrate and sodium hydroxide. The synthesized ZnO nanoparticles exhibited a crystalline structure with hexagonal structure of the wurtzite. The morphology of the synthesized ZnO nanoparticles presented a spherical shape with the average primary size of 54.53 nm and the specific surface area of 20.28 m2 g−1. The effect of the synthesized ZnO nanoparticles by the precipitation method as a crosslinking agent for chloroprene rubber foam (CR foam) on cure characteristics, mechanical properties and morphologies was investigated. The aim of this study is to vary the synthesized ZnO nanoparticles’ level in the range of 0.5–5 parts per hundred parts of rubber (phr) compared with the conventional ZnO at 5 phr. The rheological characterization showed that the maximum torque (H), the minimum torque (L), the differential torque (H–L) and Mooney viscosity increased with the increase in synthesized ZnO nanoparticles’ content, whereas the optimum cure time (90) and scorch time (5) decreased. On the other hand, the mechanical properties such as hardness, tensile strength and specific gravity were improved. For CR foam, the results compared to the amount of conventional ZnO, only 60 wt% (3 phr) nano-ZnO was enough to obtain similar cure characteristics and mechanical properties. The synthesized ZnO nanoparticles showed the mechanical properties higher than conventional ZnO because of small particle size and large specific surface area which led to the increase in the degree of crosslinking.

  4. CSR-coated PMMA panel and packing materials for glove box

    The panel and packing materials for glove box have been studied. The surface of the PMMA panel and the packing fitted to a glove box damages by the chemicals during long use. Both the PMMA panel and the packing are attacked chemically by chemical reagents such as strong acids, and swollen or resolved by some organic solvents used in a glove box, lowering the transparency of the panel and airtightness of the packing. The PMMA panel also suffers damages on the surface by scratching and striking with equipments or tools in the glove box. It is hard to renew the damaged panel and packing of glove box because of contamination by the poisonous species such as plutonium. Therefore, the selection of the materials of the panel and packing is very important. In this study, the recommendable materials for the panel and packing which have high resistance to chemicals have been searched by experimental test. The CSR (Coating for Scratching Resistance) coated PMMA plate, whose surface is strengthened by organopolysiloxane coating has been examined as the panel material of a glove box and compared with the present uncoated PMMA plate. Eight types of synthetic rubber, urethane rubber, acrylonitrile-butadiene rubber (NBR), epichlorohydrin rubber, fluoro rubber, chlorosulfonated polyethylene (CSM), halogenyzed isobutylene-isoprene rubber, silicone rubber and polysulfide rubber have been examined and compared with the presently used chloroprene rubber (CR). The CSR coated PMMA plate showed high resistance to chemical reagents and solvents, especially to strong inorganic acids. No chemical hazing or crazing appeared on the surface by the short contact with those chemicals. Also the hardness of the plate surface was strengthened up to the level of glass by the CSR coating. Gechron 2000, a kind of epichlorohydrin rubber, showed the most high resistance to chemical degradation and swelling of the tested samples. (author)

  5. Identification and degradation characterization of hexachlorobutadiene degrading strain Serratia marcescens HL1.

    Li, M T; Hao, L L; Sheng, L X; Xu, J B


    A bacterium (strain HL1) capable of growing with hexachlorobutadiene (HCBD) as sole carbon and energy sources was isolated from a mixture of soil contaminated with HCBD and activated sludge obtained from petrochemical plant wastewater treatment plant by using enrichment culture. Biochemical characteristics and phylogenetic analysis based on 16S rDNA sequence indicate that strain HL1 clearly belongs to Serratia marcescens sp. Resting cells of strain HL1 were found to remove HCBD from culture fluids with the concomitant release of chloride ion under aerobic conditions. The ranges of pH value and temperature for satisfactory growth of strain HL1 cells were from 7.0 to 8.0 and 25 to 30 degrees C, respectively. Capability of resting cells to degrade HCBD was induced by HCBD in the culture fluids. HCBD (20mg/l) was removed from culture fluids by resting cells in 4 d without lag phase, but for 50mg/l and 80mg/l HCBD 7 days were needed with lag phase. Growth of strain HL1 cells was inhibited by HCBD at the concentration up to 160mg/l. First order kinetics could be fitted to the biodegradation of HCBD by HL1 cells after lag phase at initial concentrations of 20, 50, and 80mg/l. Strain HL1 also showed strong capacity to degrade chloroprene, trichloroethylene, tetrachloroethylene, and vinyl chloride at solely initial concentration of 50mg/l. Results could offer useful information for the application of strain HL1 in bioremediation or control of HCBD-polluted environment. PMID:18337093

  6. Preparation and properties of magnetic rubber composites%磁性橡胶复合材料的制备及性能

    刘洋; 李旭日; 王娜; 杨凤; 方庆红


    A type of magnetic rubber composite that could decrease the surface tension of gasoline , enhance combustion efficiency and reduce the emis-sion of exhaust gas was prepared with nitrile rubber and chloroprene rubber as matrix , triiron dodecacar-bonyl as magnetic filler.The mechanical properties , oil resistance and aging resistance of the functional composite were studied , the magnetic property of the composite and its effect on the physical and chemical properties of gasoline and the effect mechanism were investigated.The results showed that the composite had good mechanical properties , oil resistance and aging resistance , and its all-round properties was the best at 1 phr magnetic filler.The composite could increase the combustion efficiency of gasoline by en-hancing the vibration and rotation of gasoline mole-cules to improve the atomization and gasification lev-els.%以丁腈橡胶和氯丁橡胶为基质,通过添加磁性材料十二羰基三铁制备了能够减小汽油表面张力、提高其燃烧效率,从而降低有害气体排放的磁性橡胶复合材料,研究了复合材料的力学性能、耐油和耐老化性能、磁性能以及对汽油理化性能的影响及其机理。结果表明,磁性橡胶复合材料具有良好的力学性能及耐油和耐老化性能,当磁性材料添加量为1份(质量)时其综合性能最佳。复合材料作用于汽油后,通过增强汽油中有机分子的振动和转动来改善其雾化和气化质量,进而提高燃烧效率。

  7. Hand protection from ultraviolet exposure

    Khazova, M.; O' Hagan, J.B. [Health Protection Agency, Radiation Protection Division, Chilton, Did cot (United Kingdom)


    Full text of publication follows: A number of industrial applications and public services involve exposure to ultraviolet radiation (U.V.R.) from a variety of lamps and lasers, for example, in forensic examination, biological trans-illuminators, dentistry, laser material processing, microelectronics, etc. The proposed European Union Directive on Optical Radiation would place specific requirements on employers to provide adequate safety measures to reduce exposure to U.V.R., including gloves for hand protection. The selection of gloves should be based on a risk assessment and on the performance characteristics of the gloves for the task. However, current International and national standards do not describe evaluation procedures of disposable gloves for hand protection against non-ionising radiation. A methodology for assessment of the UV protection level for disposable gloves and a simple measurement protocol are proposed, based on a common approach with UV protection by clothing and sunscreens. Glove Ultraviolet Protection Factor is defined as a time-scale increase in exposure permitted for the hand protected by a glove with respect to an unprotected hand. However, the wide variety of U.V.R. sources and the real-life conditions of glove use (stretching and wetting the surface by liquids) bring substantial challenges to the assessment method. Our study of {approx} 50 samples of widely used disposable gloves made of different materials (nitrile, vinyl, latex and chloroprene) showed that for all tested gloves a change in U.V.R. attenuation with stretching is characteristic for the type of glove material and can be included as a scaling factor in the definition of U.V.R. protection. Glove material has a bigger effect on U.V.R. protection level than variations in the glove thickness or its colour. The following approaches are suggested to overcome the problem of variable U.V.R. sources: - Worst case scenario minimal protection level, most restrictive case - Application

  8. Hand protection from ultraviolet exposure

    Full text of publication follows: A number of industrial applications and public services involve exposure to ultraviolet radiation (U.V.R.) from a variety of lamps and lasers, for example, in forensic examination, biological trans-illuminators, dentistry, laser material processing, microelectronics, etc. The proposed European Union Directive on Optical Radiation would place specific requirements on employers to provide adequate safety measures to reduce exposure to U.V.R., including gloves for hand protection. The selection of gloves should be based on a risk assessment and on the performance characteristics of the gloves for the task. However, current International and national standards do not describe evaluation procedures of disposable gloves for hand protection against non-ionising radiation. A methodology for assessment of the UV protection level for disposable gloves and a simple measurement protocol are proposed, based on a common approach with UV protection by clothing and sunscreens. Glove Ultraviolet Protection Factor is defined as a time-scale increase in exposure permitted for the hand protected by a glove with respect to an unprotected hand. However, the wide variety of U.V.R. sources and the real-life conditions of glove use (stretching and wetting the surface by liquids) bring substantial challenges to the assessment method. Our study of ∼ 50 samples of widely used disposable gloves made of different materials (nitrile, vinyl, latex and chloroprene) showed that for all tested gloves a change in U.V.R. attenuation with stretching is characteristic for the type of glove material and can be included as a scaling factor in the definition of U.V.R. protection. Glove material has a bigger effect on U.V.R. protection level than variations in the glove thickness or its colour. The following approaches are suggested to overcome the problem of variable U.V.R. sources: - Worst case scenario minimal protection level, most restrictive case - Application


    徐志强; 卢咏来; 张立群; 闫寿科


    橡胶拉伸取向和应变诱导结晶被公认为是天然橡胶和一些合成橡胶(如氯丁橡胶、丁基橡胶、氢化丁腈橡胶等)高效自增强的关键所在,研究该现象和行为规律对理解橡胶增强机理具有十分重要的意义.本文总结了常用于研究橡胶拉伸取向和应变诱导结晶的表征方法,对其原理、特点和适用范围进行了对比分析;综述了纳米填料(炭黑,二氧化硅,黏土,碳纳米管)增强橡胶的拉伸取向和应变诱导结晶以及热塑性弹性体拉伸取向的研究进展;并展望了该领域的未来发展方向.%Stretching orientation and strain-induced crystallization of rubber is widely recognized to play key role in the self-reinforcement of natural rubber and some synthetic rubbers (such as chloroprene rubber, butyl rubber and hydrogenated nitrile-butadiene rubber). Therefore, studying these phenomena and behavior has substantial significance for understanding the mechanism of the rubber reinforcing. In this review, various characterization methods concerning stretching orientation and strain-induced crystallization of polymer materials as well as principles, features and applicable scope of these methods were summarized and compared.Current progresses in the research about stretching orientation and strain-induced crystallization of nano-fillers (including carbon black, silica, nano clay and carbon nanotube) reinforced rubber composites as well as thermoplastic elastomers were surveyed. Finally, the future developing trend in this research field was prospected.

  10. Dynamic Mechanical Properties and Johnson-Cook Type Constitutive Equation of Wood Rubber Shock Absorber for Vehicle%车用木橡胶减震器动态力学性能及Johnson-Cook型本构方程

    齐英杰; 孙奇; 马岩


    [Objective]The main purposes of this paper is to analyze the mechanical properties of wood rubber shock absorber for vehicle,to obtain the Johnson-Cook constitutive equation and to check out whether the equation can exactly describe the relationships of stress and strain for wood rubber shock absorber for vehicle. [Method]We select the small Xing’an mountain Korean pine (Pinus koraiensis) wood with the density of 0. 439 g cm -3 and moisture content of 12%, chloroprene rubber which has good elasticity,high bonding strength,flexible layer,resistant to impact and vibration is also used as experimental materials. Micrometer-level fiber forging machine is applied to process the dried red pine wood into wood fiber,then put these wood fiber into the kneading machine,and obtain the micro wood fiber with width of 1 -2 mm,length of 15 -30 mm. The specimens of wood rubber shock absorber for vehicle were prepared by several processes including the preparation,weighing,mixing,molding,holding pressure,unloading,and so on. Dynamic compression tests on the specimens of wood rubber shock absorber for vehicle are performed by using Split Hopkinson pressure bar,and get the curves at the strain rate of 1 250 s -1 ,1 500 s -1 and 1 750 s -1 ,respectively. Finally,using the experimental data and Origin software to ascertain the parameters of Johnson-Cook constitutive equation,then the Johnson-Cook constitutive equation,and the experimental curve and the curve fitted by the Johnson-Cook constitutive equation is established and compared,respectively.[Result]Theφ10 mm × 10 mm specimens of wood rubber shock absorber for vehicle were made, the stress and strain curves at the strain rate of 1 250 s -1 ,1 500 s -1 and 1 750 s -1 were obtained by dynamic compression tests,and the Johnson-Cook constitutive equation ( σ = [21 +0.329(ε)1.16]×[1 +0.148ln(·ε* )]) of wood rubber shock absorber for vehicle are successfully established. [Conclusion]By analyzing the stress and strain curves of

  11. NTP Toxicology and Carcinogenesis Studies of 1,3-Butadiene (CAS No. 106-99-0) in B6C3F1 Mice (Inhalation Studies).


    1,3-Butadiene is used as an intermediate in the production of elastomers, polymers, and other chemicals. Of the 1,3-butadiene used in 1978, 44% was used to manufacture styrene-butadiene rubber (a substitute for natural rubber, produced by copolymerization of 1,3-butadiene with styrene), and 19% was used to produce polybutane elastomer (a substance that increases resistance of tire products to wear, heat degradation, and blowouts). Chloroprene monomer, derived from 1,3-butadiene, is used exclusively to manufacture neoprene elastomers for non-tire and latex applications. Commercial nitrile rubber, used largely in rubber hoses, seals, and gaskets for automobiles, is a copolymer of 1,3-butadiene and acrylonitrile. Acrylonitrile- butadiene- styrene resins, usually containing 20%-30% 1,3-butadiene by weight, are used to make parts for automobiles and appliances. Other polymer uses include specialty polybutadiene polymers, thermoplastic elastomers, nitrile barrier resins, and K resins(R). 1,3-Butadiene is used as an intermediate in the production of a variety of industrial chemicals, including two fungicides, captan and captofol. It is approved by the U.S. Food and Drug Administration for use in the production of adhesives used in articles for packaging, transporting, or holding food; in components of paper and paperboard that are in contact with dry food; and as a modifier in the production of semigrid and rigid vinyl chloride plastic food-contact articles. No information was located on the levels of monomer or on its elution rate from any of the commercially available polymers. It is not known if unreacted 1,3-butadiene migrated from packaging materials. Male and female B6C3F1 mice were exposed to air containing 1,3-butadiene (greater than 99% pure) at concentrations of 0-8,000 ppm in 15-day and 14-week inhalation studies. In the 15-day studies, survival was unaffected by dose, and no pathologic effects were observed; slight decreases in mean body weight occurred at the