PVC／胶粉热塑性弹性体的制备与性能研究

以聚氯乙烯(PVC)和胶粉为主要原料,采用共混的方法制备了PVC／胶粉热塑性弹性体,研究了胶粉的改性剂、PVC的改性剂和胶粉的用量等对PVC／胶粉热塑性弹性体性能的影响,并与国标GB／T 18173.1–2012所要求的性能进行比对。研究结果表明,使用橡胶再生剂RV改性胶粉所制得的PVC／胶粉热塑性弹性体综合性能最优;使用乙烯–乙酸乙烯酯塑料(EVAC)、苯乙烯–丁二烯–苯乙烯塑料(SBS)改性PVC时,EVAC的改性效果优于SBS,使用15份EVAC所制得的PVC／胶粉热塑性弹性体具有更佳的力学性能、耐老化性能,且满足国标要求;随着胶粉用量的增加,PVC／胶粉热塑性弹性体的综合力学性能下降,耐老化性能提高,使用30份改性胶粉时性价比最高,同时满足国标GB／T 18173.1–2012要求。     

微纳层叠共挤对EPDM/PP热塑性弹性体力学性能的影响

利用自制的微纳层叠共挤成型装备预制EPDM/PP多层复合材料,通过动态硫化制备共挤和共混2种EPDM/PP热塑性弹性体,测试EPDM/PP热塑性弹性体的力学性能,并利用扫描电子显微镜观察EPDM/PP热塑性弹性体相态结构。结果表明:共挤法能够明显减小橡胶相颗粒粒径的大小,且粒径均匀,并提高了橡胶相颗粒的分散均匀性,共挤法制备的EPDM/PP热塑性弹性体的力学性能总体优于共混法。     

NBR/PVC热塑性弹性体的性能研究及应用

选用不同硫化体系,用动态硫化法制备了丁腈橡胶(NBR)/聚氯乙烯(PVC)热塑性弹性体,考察了硫化体系、增塑剂邻苯二甲酸二辛酯(DOP)用量、填料种类、NBR与PVC的质量比对热塑性弹性体性能的影响.结果表明,采用过氧化二异丙苯/硫磺复合硫化体系硫化的热塑性弹性体的性能较好;炭黑的增强效果优于白炭黑和轻质碳酸钙;DOP用量增加,热塑性弹性体的综合力学性能下降;NBR与PVC的质量比增加,热塑性弹性体的柔性增加.所研制的NBR/PVC经压延塑化造粒、注射成型可以制得某品牌汽车的油箱密封垫片,极大地提高了生产效率,提高了市场竞争力.     

聚氯乙烯热塑性弹性体的阻尼性能研究

研究了增塑剂、无机填料以及酚醛树脂对聚氯乙烯(PVC)热塑性弹性体(TPE)力学性能及动态力学性能的影响。结果表明:聚酯增塑PVC弹性体材料体系的tanδ峰值明显高于DOP、DOTP、TOTM三种增塑剂,且阻尼性能最优;随着聚酯用量的增加,PVC弹性体的tanδ峰值逐渐提高,tanδ峰逐渐向低温方向移动。PVC热塑性弹性体中加入适量无机填料可以提高其tanδ峰值;可以用酚醛树脂调整PVC弹性体阻尼材料tanδ峰所对应的温域,从而改善其阻尼性能。     

黑液-蒙脱土/聚氯乙烯/丁腈橡胶热塑性弹性体的制备及性能研究

采用蒙脱土对造纸黑液中的木质素进行絮凝沉淀,制备黑液-蒙脱土复合物(BL-MMT),然后将其应用于聚氯乙烯/丁腈橡胶(PVC/NBR)热塑性弹性体,并对其力学性能、耐老化性能及热降解性能进行测试。结果表明:随着BL-MMT中木质素蒙脱土比例增大,热塑性弹性体力学性能先增大后减小,适宜配比m(木质素)∶m(蒙脱土)=1∶1。BL-MMT份数增大,热塑性弹性体力学性能先增大后减小,20份时出现最大值。BL-MMT填充的PVC/NBR热塑性弹性体与添加炭黑和碳酸钙相比,力学性能和热性能相当,而耐老化性能更为优越。黑液-蒙脱土复合物可望用作PVC/NBR热塑性弹性体的补强剂。     

钢塑共挤门窗

北京众和智业科技发展公司等企业推出了新一代钢塑共挤门窗。钢塑共挤门窗型材是由耐腐精轧型钢和 PVC共挤成型 ,充分发挥各种组合材料优势 ,提高强度 ,可在高层建筑中使用。钢塑共挤门窗的成本低 ,主要材料为 PVC塑料和冷轧钢板 ,经核算每平方米标准用材量塑料和钢均为 6kg/m2 ,成本比目前高性能门窗降低较多。钢塑共挤门窗另一特点是易安装 ,它采用组角钢件联结工艺 ,组装后门窗的强度高 ,而且不需要专业设备 ,为钢塑共挤门窗的普及和推广带来极大的方便。北京中融永安环保建材有限公司在塑料型材生产品剔除铅、锌、镉等有害物质 ,加入…     

PVC/NBR热塑性弹性体加工流变性能研究

采用反应挤出动态硫化法制备了聚氯乙烯／丁腈橡胶(PVC／NBR)热塑性弹性体，用锥板流变仪、毛细管流变仪和转矩流变仪研究了动态硫化的PVC／NBR热塑性弹性体的流交性能和塑化性能。实验结果表明，动态硫化的PVC／NBR热塑性弹性体的熔体属于剪切稀化的假塑性流体，具有良好的返炼性能，综合性能超过国外同类产品。     

吉力士热塑性弹性体推出电脑电源线和附件连接线用无卤阻燃热塑性弹性体 新型OnFlex~(TM)无卤阻燃材料为消费电子产品电源线中使用的软质PVC提供安全环保替代方案

本刊广州消息(2009年5月18日)全球领先的高性能定制热塑性弹性体制造商,普立万公司旗下吉力士热塑性弹性体部门今天宣布推出无卤阻燃(HFFR)热塑性弹性体(TPE)系列新品,可替代消费电子产品中使用的传统软质聚氯乙烯(PVC)电线皮和绝缘材料。吉力士全新的OnFlex     

PUR-T／PVC热塑性弹性体的制备及工艺探究

以热塑性聚氨酯弹性体(PUR–T)、聚氯乙烯(PVC)为主要原材料,通过熔融共混挤出制备PUR–T／PVC共混热塑性弹性体。讨论了PUR–T／PVC共混比、增塑剂用量、挤出共混温度、螺杆转速对共混弹性体性能的影响,利用万能试验机、扫描电子显微镜、转矩流变仪、旋转流变仪等研究了弹性体的加工性能及结构。结果表明,当PUR–T／PVC共混比为70／30,增塑剂邻苯二甲酸二辛酯用量为20份,挤出温度为160℃,螺杆转速为330 r／min时,弹性体材料的综合性能最佳;共混弹性体的表观黏度小于纯PUR–T,PVC含量在20%～50%时,PVC易形成网络结构。     

聚氯乙烯类热塑性弹性体的研究进展

概述了聚氯乙烯类热塑性弹性体(PVC—TPE)的最新研究进展。根据制备方法把其分为：与弹性体共混型、引入交联或歧化结构型、高相对分子质量聚氯乙烯增塑型3类。着重介绍了几种共混型热塑性弹性体，并对PVC—TPE发展前景进行了展望。     

可生物降解热塑性聚氨酯弹性体的合成与性能研究

以中等分子量聚碳酸亚丙酯多元醇作为软段,并与过量的甲苯二异氰酸酯生成预聚物,用1,4–丁二醇进行扩链制备热塑性聚氨酯弹性体,整个反应体系保持—NCO/—OH=1.2。研究了硬段含量变化对材料结构与性能的影响。结果表明,所得弹性体的拉伸性能随着硬段含量的增加而增大,这是微相分离变化的结果;弹性体具有较好的生物降解性,可用于潮湿恶劣环境。     

Performance benefits of TPE inter‐material substitution using metallocene ethylene elastomers

Thermoplastic elastomers (TPEs) are one of the fastest‐growing segments of the plastic compounding market and are projected to grow at an annual rate of 5%–6% (1). By offering additional options and benefits on the price‐performance curve, thermoplastic olefins (TPOs) are expected to grow at higher rates than many styrenics and thermoplastic vulcanizates (TPVs) in automotive, durables and construction market sectors. Traditionally, these markets initially specify materials that may be over‐engineered in an application to ensure they fully meet the required properties. Over time, however, specifiers are often forced to shift their focus to reduce costs via new material substitution, provided they can continue to meet the required properties. Likewise, inter‐material substitution is a common trend based on the product delivering improved performance over the incumbent material at comparable costs, such as the movement to replace f‐PVC compounds with soft TPOs in automotive interior thermoformed sheeting. The soft TPOs based on metallocene ethylene elastomers offer improved cold‐temperature‐impact performance, lower part weight, and extended lifetime durability over f‐PVC at essentially the same part cost. This paper offers a comparison of emerging soft TPO compounds based on metallocene ethylene elastomers with styrene tri‐block polymer (SEBS), TPVs and f‐PVC compounds. J. Vinyl Addit. Technol. 10:129–136, 2004. © 2004 Society of Plastics Engineers.     

Novel Segmented Thermoplastic Polyurethanes Elastomers Based on Tetrahydrofuran Ethylene Oxide Copolyethers as High Energetic Propellant Binders

Novel thermoplastic polyurethane (TPU) elastomers based on copolyether (tetrahydrofuran ethylene oxide) as soft segments, isophorone diisocyanate and 1,4‐butanediol as hard segments were synthesized for the purpose of using as propellant binders. In order to increase the miscibility of thermoplastic polyurethane elastomers with nitrate ester, polyethylene glycol (PEG) is incorporated in the co‐polyether (tetrahydrofuran ethylene oxide) as soft segment. When the molecular weight and content of polyethylene glycol are controlled to 4000 and 6% of soft segments, respectively, the properties of thermoplastic polyurethane elastomers are most perfect. If plasticizing ratio of nitrate ester to thermoplastic polyurethane elastomers exceeds 4 no crystallinities are determined at room temperature. The propellant samples were prepared by a conventional absorption‐rolling extrusion process and the mechanical and combustion properties evaluated afterwards. The maximum impulse reaches up to 265∼270 s which is a little bit higher than that of a HTPB propellant. The measured results reveal a promising TPE propellant candidate which shows good processing temperature (<393 K) and excellent mechanical properties. An attracting feature which can be pointed out is that the burning rate pressure exponent reaches as low as 0.36 without the addition of burning rate catalysts. This enables an easy control of propellant combustion.     

GAP/PET嵌段型热塑性聚氨酯弹性体的低温力学性能

为改善聚叠氮缩水甘油醚(GAP)基黏合剂的低温力学性能,以GAP和环氧乙烷-四氢呋喃共聚醚(PET)为软段,甲苯-2,4-二异氰酸酯(TDI)偶联的丁二醇为硬段,通过扩链聚合反应合成GAP/PET嵌段型热塑性聚氨酯弹性体;分别采用红外光谱(FT-IR)、核磁共振(NMR)、差示扫描量热分析(DSC)、动态热机械分析(DMA)、热重分析(TGA)和万能材料试验机对其化学结构、玻璃化转变温度、热稳定性和低温拉伸性能进行表征。结果表明,随着PET含量的提高,GAP/PET嵌段型热塑性聚氨酯的T_g明显降低,当PET与GAP摩尔比为1∶1时,GAP/PET嵌段型热塑性聚氨酯的T_g为-37.7℃,在-40℃低温环境发生韧性断裂,断裂强度为25.78MPa,断裂伸长率为379.4%,具有优异的低温力学性能;同时TGA试验表明GAP/PET嵌段型热塑性聚氨酯T_d>220℃,热稳定性好。     

动态硫化NBR/PVC共混物性能的研究

介绍了以丁腈橡胶为主体材料,采用动态硫化法制备共混热塑性弹性体的方法,考查了橡塑比、动态硫化温度、填料用量等因素对热塑性弹性体力学性能的影响,研究了加入不同量白炭黑所得TPV的微观相态结构.     

Thermoplastic elastomers from NBR and polyvinyl chloride

This paper will discuss recently developed technology that demonstrates the effectiveness of a thermoplastic polyvinyl chloride/nitrile rubber alloy versus commercially available thermoplastic elastomers and conventionally cured rubbers. Compounding variations, mixing and processing of thermoplastic elastomers such as low temperature properties, compression set, heat resistance, flex properties, and oil and fuel resistance will be examined. Compounding variations of the PVC/NBR allows will be explored to show how recipe changes can affect these important properties.     

PVC/NBR热塑性弹性体热塑性能的研究

将动态硫化方式制备的PVC/NBR老化前后制品力学性能与重复加工后PVC/NBR制品老化前后力学性能进行对比，发现所制备的PVC/NBR共混体具有热塑性，同时对PVC/NBR热塑性弹性体有了比较深刻的了解。     

Elastomeric alloys of PVC

The performance standards for flexible PVC compounds continue to become more demanding as manufacturers pursue more value-added applications traditionally dominated by rubbers and thermoplastic elastomers. Blending of PVC with other polymers has proven to be a viable approach in developing higher performance flexible PVC-based materials. This paper will review some of the typical approaches to producing PVC-based elastomers, and show how these standard flexible PVC blends compare to a newly developed family of PVC alloys. The advantages of these materials will be discussed, and some examples of commercial materials and their application will also be reviewed.     

Influence of soft segment content and chain length on the physical properties of poly(ether ester) elastomers and fabrication of honeycomb pattern and electrospun fiber

Different series of poly(ether ester) (PEE) thermoplastic elastomers were synthesized using dimethyl-2,6-naphthalene dicarboxylate as hard segment, 1,4-butanediol as the chain extender, and three different soft segments of different molecular weights (MW), namely polycaprolactone diol (MW: 530 and 2000), poly(tetramethylene ether glycol) (MW: 1000 and 1800), and polycaprolactone-block-polytetrahydrofuran-block-polycaprolactone (MW: 2000). The composition of soft segment was changed from 30% to 50% with respect to the hard segment. The characteristic studies were focused to analyze the influence of the concentration and length of the soft segment content. In each series, 50:50 compositions of the hard and soft segments were found to show the best mechanical properties. In addition the physical properties of the elastomer were very sensitive to the type of soft segment. The elastomers prepared in this study were systematically characterized using various spectroscopic studies and thermal and mechanical analyses. As a means of discovering the feasibility of PEE elastomers as new functional materials honeycomb patterns and nanofibers have been fabricated by applying breath figures method and electrospinning, respectively, yielding uniform honeycomb structures and nanofibers of their diameter ranging from about 100 to 800 nm depending on the type of elastomer and the electrical potential employed .     

聚氯乙烯类热塑性弹性体

综述了聚氯乙烯类热塑性弹性体的种类、结构、性能和应用等,并介绍了国产高聚合度PVC的应用。