摘要
本实验通过刚果红法研究金属皂类热稳定剂硬脂酸钙、硬脂脂锌、硬脂酸钡在软质PVC体系中单独使用、两两混合、三者混合使用时的热管理性能以及协同稳定性能。重点研究热稳定剂的用量对软质PVC刚果红试纸初始变色时间和初始变色温度的影响。结果表明:在软质PVC体系中单独使用金属皂类热稳定剂时软质PVC的热稳定性能不好;两两混合时硬脂酸锌/硬脂酸钡按1∶2混合和硬脂酸锌/硬脂酸钙按1∶2混合时软质PVC体系热稳定性能比硬脂酸锌/硬脂酸钡按1∶1和2∶1以及硬脂酸锌/硬脂酸钙按1∶1、2∶1、1∶3、3∶1混合时要好;三者混合时硬脂酸钙/硬脂酸锌/硬脂酸钡按1∶1∶1混合时软质PVC体系热稳定性能较好,比两两混合使用时好,同时能有效的抑制软质PVC体系初期着色现象,是软质PVC体系的较佳热稳定剂。
The influence of metal soap thermal stabilizers on the dehydrochlorination of flexible PVC was studied in this paper. The stabilizers were mixtures of calcium stearate, zinc stearate and barium stearate with series of different ratios. Each formulation was evalvated by the Congo Red test in which both the temperature and the time for the dehydrochlorination of flexible PVC were measured as the sample was heated at 180% in a test tube. The resuits of the Congo Red test showed that calcium stearate, zinc stearate, or barium stearate which was used single is not a good thermal stabilizer for flexible PVC. However, zinc stearate/calcium stearate with 1：2 （mass ratio） as stabilizers for flexible PVC is more effective than which with 1： 1, 2： 1, 1： 3and 3： 1. At the same time, zinc stearate/barium stearate with 1： 2as stabilizers for flexible PVC is superior to which with 1： land 2： 1. The most effective stabilizer for flexible PVC is the mixture of calcium stearate, zinc stearate and barium stearate together with the mass ratio of 1 ： 1 ： 1, which can obviously restrain the early colour changes of flexible PVC.
出处
《合成材料老化与应用》
2005年第4期27-31,共5页
Synthetic Materials Aging and Application
关键词
聚氯乙烯
金属皂类热稳定剂
刚果红法
脱氯化氢
polyvinyl chloride, metal soap thermal stabilizers, Congo Red test, dehydrochlorination
