粉末丁腈橡胶改性软质PVC的研究

用粉末丁腈橡胶Ｃｈｅｍｇｉｕｍ Ｐ８３改性软质ＰＶＣ,使其拉伸强度、斯裂强度、脆性温度、压缩永久形变等物理性能得到明显改善,尤其是耐油性能得到了显著提高。     

鞋底料用粉末丁腈橡胶改性PVC

用大粒径粉末丁腈橡胶（ＰＮＢＲ）改性ＰＶＣ并制备了鞋底专用料,研究了ＰＮＢＲ、增塑剂、填料及加工工艺对共混物性能的影响。结果表明,ＰＶＣ１００份（质量份,下同）,大粒径ＰＮＢＲ１０～３０份,邻苯二甲酸二辛酯５０～７０份,高芳烃油１０～３０份,超细碳酸钙２０份及适量助剂,用混炼－挤出或挤出－挤出加工工艺可以制得性能达到ＧＢ４４９２－８４指标的鞋底专用料。     

粉末丁腈橡胶改性软质聚氯乙烯的应用试验

就粉末丁腈橡胶改性软质聚氯乙烯进行应用试验配方设计、样条制备及性能测试。讨论了不同含量的丁腈橡胶（NBR）、增塑剂DOP、填充剂C aCO3对共混物性能的影响,并确定了最佳配方。     

PVC和白炭黑对NBR／PVC共混体耐磨和耐疲劳性的作用

研究了ＰＶＣ和白炭和黑对热力学不相容的ＮＢＲ／ＰＶＣ并有耐磨和耐疲劳性的影响，并探讨了其相应机理，借助扫描电镜（ＳＥＭ）观察了并用体系的屈挠疲劳断面，发现随ＰＶＣ用量增加和白炭黑用量减少，疲劳断面由原来的粗糙孔洞（Ｃｏａｒｓｅ－ｈｏｌｅ）裂纹型变成了波浪河流（Ｗａｖｅ－ｒｉｖｅｒ）型，并用体系优异的耐磨和耐疲劳性是由其相容性和界面过渡层结构等决定的。     

粉末丁腈橡胶P83改性PVC软质鞋用粒料的开发

本文介绍进口粉末丁腈橡胶Ｐ８３改性ＰＶＣ软质鞋用粒料的开发试制工作，探讨了Ｐ８３用量及其加入时体系温度对改性体系性能的影响，测定了改性料的耐磨性、耐寒性、拉伸强度、断裂伸长率、冲击回弹性等方面性能，表明了适当控制Ｐ８３用量及加工条件，改性料的上述性能毕有明显改进。     

粉末丁腈橡胶改性软质PVC的性能研究

以粉末丁腈橡胶作为改性剂,通过正交实验的方法,研究了增塑剂邻苯二甲酸二辛酯(DOP)、粉末丁腈橡胶P83、轻质CaCO3对软质聚氯乙烯(PVC)力学性能和加工性能的影响。结果表明:DOP在常温和热老化的情况下,对伸长率影响最大;P83对常温下拉伸强度、耐油情况下的扯断伸长率影响最大;CaCO3不论是在什么条件下对性能的影响都不是最主要的。综合考虑力学性能和加工性能,3种因素的最佳水平组合应为A2B2C2,即DOP 60份、P83 20份、CaCO320份时最好。     

粉末丁腈橡胶P83改性PVC软质鞋用粒料的开发

本文介绍进口粉末丁腈橡胶Ｐ８３改性ＰＶＣ软质鞋用粒料的开发试制工作，探讨了Ｐ８３用量及其加入时体系温度对改性体系性能的影响，测定了改性料的耐磨性、耐寒性、拉伸强度 、断裂伸长率、冲击回弹性等方面性能，表明了适当控制Ｐ８３用量及加工条件、改性料的上述性能皆有明显改进。     

拜耳NBR／PVC（丁腈橡胶／聚氯乙烯）共混胶特性及应用

一、NBR/PVC的研究发展NBR是耐油橡胶中最重要的品种之一。市场需求量为 2 0 0 0 0吨 /年 (中国 )。这是机械密封、流体输送所用之主体材料。NBR的耐热、耐油、耐天候老化性一直是人们最关注的性能和研究重点。对 NBR的研究包括 :1、采用镉镁硫化体系提高 NBR的耐热性 ,由 1 2 0°C→ 1 3 5°C。2、采用不易挥发高分子的聚酯、聚醚类增塑剂 (如 Vulkanol OT) ,减少增塑剂的抽出性 ,提高耐热性。3、采用高促低硫和过氧化物硫化体系 ,改善胶料的压缩永久变形性能。4、采用高 ACN(丙烯腈 )含量提高胶料耐油性。5、采用特殊防老剂 ,…     

化学微交联聚氯乙烯的结构和性能

通过氯乙烯/邻苯二甲酸二烯丙酯(VC/DAP)悬浮共聚,合成了含部分凝胶结构的化学微交联PVC树脂,对微交联PVC的玻璃化转变行为、加工性能、消光性能、加热-形变行为和力学性能进行了研究。当DAP用量在0.25%mol以下时,PVC的玻璃化温度变动不大。凝胶含量的增加将导致交联PVC_d~T的光泽度下降,消光性能提高;塑化时间和加工扭矩均增加,加工性能急剧变差;加热变形值下降,最高使用温度提高。凝胶对PVC拉伸性能的影响较为复杂,但压缩永久变形则随凝胶含量的增加而下降,材料的弹性性能逐渐提高。     

聚氨酯丙烯酸酯紫外光固化PVC涂料的研制

通过对涂料不同组分的种类及配比进行调节,制备不同配方的PVC清漆。在测试附着力、硬度、耐温、耐水性能的基础上,优化涂料配方,并配制出性能优异的PVC清漆涂料。     

Properties of Blends Prepared from Surface-modified Low-density Polyethylene and Poly(vinyl chloride)

Improvement of adhesion between low-density polyethylene (LDPE) and poly(vinyl chloride) (PVC) in their blends was attempted by plasma modification of their surfaces. A series of different plasma treatments, vinyl chloride or carbon tetrachloride plasma for PE and acetylene plasma for PVC, were employed. In addition, an oligomeric copolymer of PE–VC was also tested in the blend. After modification, different degrees of improvement were obtained in mechanical properties, ranging from slight for acetylene plasma-modified samples to high for the vinyl chloride plasma-modified samples and samples with added oligomeric copolymer. © of SCI.     

马来酸酐接枝改性氯化聚氯乙烯的制备及其在PVC中的应用

采用固相法制备马来酸酐接枝氯化聚氯乙烯(CPVC-g-MAH),得到了接枝率达2.91 %的CPVC-g-MAH,并对其进行了性能测试,探讨了聚氯乙烯(PVC)/CPVC-g-MAH共混物的冲击性能和加工性能,与PVC/氯化聚氯乙烯(CPVC)共混物进行对比以观察改性效果。结果表明,CPVC-g-MAH的热性能较CPVC有较大提高;PVC/CPVC-g-MAH共混物的冲击性能比PVC/CPVC共混物有所提高,而平衡转矩有所降低,说明CPVC-g-MAH相比于CPVC对PVC共混物加工性能改善效果更加明显。     

Poly(vinyl chloride) and its fire properties

This work provides an up‐to‐date review of the fire properties of poly(vinyl chloride) (PVC) materials, both rigid (unplasticized) and flexible (plasticized). The fire properties addressed include ignitability, ease of extinction (oxygen index), flame spread (small scale and intermediate scale), heat release, smoke obscuration, smoke toxicity, hydrogen chloride emission and decay, and performance in real‐scale fires. This comprehensive review includes a wide selection of references and tables illustrating the properties of PVC materials in comparison with those of other polymeric materials, including, in many instances, wood materials. The work puts these fire properties in perspective, showing that the heat release rate (the key fire property) of rigid PVC (and that of properly flame‐retarded flexible PVC) are among the lower values found for combustible materials. This work also shows that the smoke toxicity and smoke obscuration resulting from burning PVC materials in real‐scale fires is in the same range as those of other materials.     

Thermal Degradation of Poly (vinyl chloride)-Stabilization Effect of Dichlorotin Dioxine

Abstract

Thermal degradation of polyvinyl chloride (PVC) and the effect of dichlorotin dioxine (DCTD) on this process have been investigated using dehydrochlorination (DHCl) and thermogravimetric techniques. A significant decrease in the rate of degradation was observed when PVC was mixed with a small amount which was maximum with 0.25 pph of DCTD and thermal decomposition temperature with DCTD was found to be higher than that of pure PVC. The value of apparent activation energy of the dehydrochlorination process has been calculated and a suitable mechanism for the stabilizing action of DCTD on PVC has been purposed.     

聚氯乙烯结皮发泡棒材生产技术

较详细地讨论了单螺杆挤出机生产聚氯乙烯结皮发泡棒材的有关技术问题,包括挤出机和模具的结构参数、最佳配方设计和关键工艺条件控制,认为采用长径比大于２５的普通单螺杆挤出机,在合理配方和工艺条件下,可生产高质量聚氯乙烯结皮发泡棒材,φ１０￣３８ｍｍ的棒材的生产可采用φ６５ｍｍ螺杆的挤出机。     

丙烯酸对废羧基丁腈橡胶/聚氯乙烯共混物性能的影响

以丙烯酸(AAc)接枝改性聚氯乙烯(PVC)和废羧基丁腈橡胶(WXNBR)共混物,在界面间生成化学键,增大两相界面间粘合力,改善了共混物的力学性能.结果表明加入少量丙烯酸,就能在不降低拉伸强度的条件下显著提高共混物的冲击强度,达到良好增韧效果.     

PVC辅助热稳定剂己二酸季戊四醇酯催化合成研究及应用

以己二酸、季戊四醇为原料,对甲苯磺酸作催化剂,采用直接酯化反应合成了己二酸季戊四醇酯,考查了温度、催化剂用量、原料配比和带水剂用量对己二酸季戊四醇酯收率的影响,确定了最佳工艺条件:醇酸物质的量比为3.4:1,带水剂用最为体系总质量的20%,催化剂用量为酸质量的2.2%,反应时间为1.5 h,己二酸季戊四醇酯收率可达99...     

Poly(vinyl chloride) (PVC) hollow fibre membranes for gas separation

Poly(vinyl chloride) (PVC) gas separation hollow fibre membranes were produced from multicomponent dopes using dry/wet forced convection spinning. Membranes spun from a low polymer content solution exhibited disappointing gas separation properties. Their low selectivities were indicative of thick skins and high surface porosities. In contrast, high polymer content spun fibres showed good gas separation properties. Selectivities were high, active layers relatively thin and surface porosities moderate. Coating with poly(dimethylsiloxane) nullified the surface pores. The favourable performance of the high polymer content spun fibres was also related to shear rate and forced convection residence time during spinning. To the knowledge of the authors, this work represents the first reported success in producing PVC hollow fibre membranes with morphologies suitable for gas separation. The development of PVC hollow fibres relates to the ultimate quest to produce membranes capable of reliably separating oxygen and ozone gas mixtures.