二氧化钛对聚氯乙烯热稳定性能的影响

通过刚果红法实验研究了不同种类和用量的二氧化钛（TiO2）对使用复合铅盐稳定剂的硬质聚氯乙烯（PVC—U）脱氯化氢反应的影响，同时研究了不同用量的TiO2对使用不同热稳定剂的PVC—U脱氯化氢反应的影响。结果表明：①在复合铅盐稳定体系中，金红石型TiO2会导致PVC—U的热稳定性的下降，而锐钛型TiO2会提高PVC—U的热稳定性；②金红石型TiO2后期的包覆处理也对PVC—U的热稳定性有影响；③金红石型TiO2（R930）在复合铅盐热稳定体系中会导致PVC—U的热稳定性下降，而在Ca／Zn热稳定体系中，则能提高PVC—U的热稳定性。

Influences of titanium dioxide on the thermal stability of PVC

Influences of different types and concentrations of titanium dioxide（TiO2） on the dehydrochlorination of unplasticized polyvinyl chloride （PVC-U） stabilized by composite lead stabilizer were studied through Congo red test. The influences of different concentrations of TiO2 on the dehydrochlorination of PVC-U stabilized by different stabilizers were also studied. The results showed that： （1） for PVC-U stabilized by composite lead stabilizer, the rutile type TiO2 could decrease the thermal stability, while the anatase TiO2 could improve the thermal stability; （2） The post coating process of rutile type TiO2 could also influence the thermal stability of PVC-U; （3） rutile type TiO2 （R930） could decrease the heat stability of PVC-U stabilized by composite lead stabilizer and increase the heat stability of PVC-U stabilized by Ca/Zn stabilizer.