PVC/ACS彩色共挤异型材的研究

制备了聚氯乙烯(PVC)/丙烯腈-氯化聚乙烯-苯乙烯塑料(ACS)彩色共挤异型材,研究了耐候层配方中的ACS含量对PVC/ACS彩色共挤异型材制品的力学性能及耐候性能的影响,考察了加工温度对所得共挤异型材耐候性能的影响,并与PVC/丙烯腈-苯乙烯-丙烯酸酯塑料(ASA)彩色共挤异型材进行对比.结果表明,ACS的耐老化性...     

芜湖化工厂800吨/年氯化聚乙烯装置 投入运行

氯化聚乙烯(CPE)是聚乙烯经氯化反应制得的一种新型合成材料。它具有一系列优良的特性,如抗冲击、抗撕裂强度较高;玻璃化温度和脆化温度较低;耐寒、耐候和耐老化性能较好,这些特点正好弥补PVC树脂的不足,两者掺合混匀后加工,可大幅度提高硬制品的抗冲击和耐撕裂强度,显著改善PVC硬制品的耐寒、耐     

耐候透明性MBS／PVC增韧体系力学和加工性能

在甲基丙烯酸甲酯-丁二烯-苯乙烯三元接枝共聚物(MBS)合成中加入耐候性单体取代部分丁二烯得到耐候透明MBS树脂,研究了耐候透明性MBS/PVC增韧体系的力学性能、流变行为、透明性和材料的热性能.结果表明,自制的耐候透明性MBS树脂是综合性能优良的抗冲击改性剂,可用于制备耐候性PVC制品.     

热熔型聚氨酯硬 PVC 粘结剂研制成功

聚氯乙烯(PVC)是我国通用塑料中的主要品种之一。目前我国 PVC 制品以软制品为主,而 PVC 硬制品有着更广阔的应用领域。因此,调整 PVC 软、硬制品的构成比例,扩大硬制品的比例,是 PVC 加工工业发展的必然趋势。研制出性能优异的硬 PVC 粘结剂,以解决     

不同碳酸钙对PVC制品机械性能的影响

介绍了不同类型的碳酸钙填充PVC制品（分硬制品和软制品）时，对制品机械性能的影响，为塑料加工行业提供了使用不同类型碳酸钙的依据，结果表明，经过表面处理的碳酸钙提高了PVC制品的机械性能。     

PVC润滑剂——VESTOWAX聚乙烯蜡的性能与应用

1 前言 PVC属于第一代塑料,被称为民用塑料,如不加于改性,性能一般。PVC制品分软制品和硬制品,其中软制品的比例高于硬制品,但以后硬制品的比例会上升,特别是在建筑上。PVC管材是消耗PVC树脂的大宗产品,重要的化学建材之一,它包括建     

硬PVC／交联PE／CPE三元共混物性能研究

交联 PE/CPE 并用改性硬 PVC,可得到综合性能较佳的增韧硬 PVC 制品,但交联度和改性剂用量应适度。实验结果表明,共混方法对改性效果的影响显著,其中分段共混法较一步法增容效果好,制品性能较好。     

氯醋树脂在PVC硬制品中的应用

考察了在PVC硬制品加工过程中加入氯醋树脂对加工工艺、产品性能的影响。结果表明:氯醋树脂可以促进PVC树脂塑化,产品综合性能有所提高。     

硬聚氯乙烯加工助剂——丙烯酸酯共聚物(ACR)

硬聚氯乙烯(PVC)的不良加工性是影响它扩大应用的重要障碍,美国Rohm·Haas公司(罗姆·哈斯公司)始创的丙烯酸酯类(ACR)是改善PVC加工性能的优良助剂,它具有改善加工性能而很少影响PVC制品物理性能的特点。这类高分子加工助剂的开拓和应用,使美国、日本的硬PVC制品获得迅速发展,广泛用来代替传统的木材和金属制品。     

PVC型材耐候性能研究进展

系统地介绍了聚氯乙烯(PVC)型材发生光氧老化的降解机理;分析了PVC型材耐候性能的影响因素,包括自身结构的内在因素和外部环境因素;例举了PVC型材在降解过程中出现的一些典型性能的变化;最后介绍了PVC型材耐候性能研究中常用的一些分析测试方法。     

硬质PVC发泡制品的配方设计

阐述了硬质PVC发泡制品配方中PVC树脂和热稳定剂、发泡剂、优泡剂、冲击改性剂、加工改性剂、填充剂、润滑剂及成核剂等助剂的选用原则,介绍了生产优质硬质PVC发泡制品的基础配方。     

Stress cracking of rigid polyvinyl chloride by plasticizer migration

Environmental stress cracking (ESC) (failure caused by crack and craze formation at a stress less than the yield stress) reduces the service life of many plastic products. This paper is concerned with ESC of rigid PVC products which are in contact with a plasticized PVC material. The ESC affect (as measured by elongation to break) is reduced at faster strain rates and by higher plasticizer viscosity, which suggests a mechanism requiring flow of plasticizer into a growing craze. Well fused (gelled) PVC made at a higher melt temperature slowed but did not eliminate environmental stress cracking. Rubber impact modifier added to the rigid PVC had no effect on ESC. Environmental stress cracking can be avoided by using flexible PVC that has a non-migrating plasticizer or by designing the product so that rigid PVC is not stressed while in contact with plasticized PVC.     

Process and material considerations in the industrial application of lubricants in rigid PVC extrusion

The proper lubrication of rigid PVC compounds often plays an important role in the successful operation of a rigid PVC extrusion plant. Changes in a particular lubricant system can have a substantial effect on the fusion rates of a rigid PVC compound and on the thermodynamics of the fusion process. Recently published research on the morphology of PVC resin and rigid PVC finished products has provided new insights into the morphological changes rigid PVC undergoes during processing. Lubricants can have a substantial impact on the rates and extent of morphological changes of rigid PVC during processing. Successful industrial optimization of a lubricant system involves balancing the rheological characteristics of the compound against the shearing and heating characteristics of the extruder and die tooling. Changes in the extruder and die tooling or lubricant system will result in changes in the work and energy balance. The impact of increases in fusion promoting lubricants, as well as increases in fusion delaying lubricants, on the work and energy balance for a twin screw extruder is explained.     

绿色建材专用PVC树脂R-1000的特性及其加工和应用

简述了上海氯碱化工股份有限公司开发的PVC树脂R—1000的合成工艺，并从PVC树脂的质量指标、颗粒特性、加工性能、VC脱吸速率及残留VC含量等方面对R—1000产品与国外同类样品进行了分析对比。分析结果表明，PVC树脂R—1000的性能已达到国际水平，充分体现出其用于硬制品挤出成型的优势。经加工应用，该公司开发的PVC树脂R一1000受到用户的欢迎和认可。     

Mathematical modeling of rigid poly(vinyl chloride) formulations: Fusion characteristics

A central composite design of experiment as used to study the effect of five additives on the fusion characteristics of a rigid PVC compound. The fusion characteristics evaluated were fusion time, fusion torque, and fusion temperature as measured by a torque rheometer. Mathematical models were constructed for the following five independent formulation variables: impact modifier, paraffin wax, calcium stearate, ester wax, and processing aid. Because of differences in the lubricating properties of these additives, mathematical modeling can help the manufacturers of rigid PVC products to understand and better formulate necessary changes to optimizes the performance requirements of their end use products. The ability to predict the fusion characteristics of a proposed formulation change will help minimize the number of required production evaluations.     

聚氯乙烯透明硬制品稳定性研究

讨论了润滑体系，加工助剂，加工设备对聚氯乙烯热稳定性的影响。     

改性碳酸钙在聚氯乙烯（PVC）消防管中的应用研究

研究了一种改性碳酸钙在聚氯乙烯(PVC)消防管中的应用情况。研究结果表明,这种经JL-G01型改性剂(Modifier)改性的碳酸钙与普通碳酸钙相比,颗粒以原生粒子状态均匀分布,不团聚,其中部分以纳米粒子状态存在,因此填充于聚氯乙烯(PVC)消防管中,不仅能改善体系的加工性能,而且赋予制品较好的物理机械性能,达到增韧补强的效果。     

我国硬质PVC低发泡挤出制品的发展概况

本文综述了我国硬质PVC低发泡挤出制品的现状和发展前景,分析了存在的问题,并提出了一些建议。     

Decomposition products of PVC for studies of fires

Approximately seventy-five organic materials have been detected by gas chromatography in the thermal decomposition products of PVC and are shown by mass spectrometry and retention studies to consist mainly of aromatic and aliphatic hydrocarbons. Weight-loss experiments and time-resolved chromatography indicate that these products are formed mainly during dehydrochlorination. The products are modified by the presence of oxygen but no oxygenated organic species have been detected. Experiments to specifically monitor the production of phosgene from the decomposition of both a rigid PVC sheet and a PVC polymer in air are recorded. Phosgene has not been detected and direct seeding techniques have been used to investigate the detection limits of this material. PVC is known to release the toxic gases, carbon monoxide and hydrogen chloride, when involved in fires. It is shown that the minor products, including phosgene, make little or no contribution to the overall toxicity of the decomposition products.     

改性碳酸钙在聚氯乙烯中的应用研究

研究了一种改性碳酸钙在聚氯乙烯(PVC)中的应用情况。研究结果表明,这种经JL G0 1型改性剂(Modifier)改性的碳酸钙与普通碳酸钙相比,颗粒以原生粒子状态均匀分布,不团聚,其中部分以纳米粒子状态存在,因此填充于聚氯乙烯(PVC)硬质、软质制品中,不仅能改善体系的加工性能,而且赋予制品较好的物理机械性能,达到增韧补强的效果