辅助热稳定剂对钡锌复合体系性能的影响

Effect of Co-stabilizers on the Properties of Ba/Zn System

探讨异辛酸钡和异辛酸锌复合体系对聚氯乙烯(PVC)透明性能的影响,以此为基础考察辅助热稳定剂水滑石(LDH)、亚磷酸酯和β-二酮3种复合体系对PVC透明性能的影响.结果表明,LDH能显著改善PVC的各项热稳定性能,并且与Ba/Zn体系产生了显著的协同效应.3种不同的辅助热稳定剂都能有效改善PVC的初期热稳定性能.

The transparency of polyvinyl chloride（PVC） stabilized with barium isooctoate and zinc isooctoate（Ba/Zn） was discussed. Then formulations based on Ba/Zn with hydrotalcite（LDH）,phosphite ester andβ-diketone were fully characterized which showed good initial color and obvious increase in transparency respectively. Afterwards,the thermal stability of PVC in the presence of Ba/Zn and LDH was studied by testing the static and dynamic stabilities,thermalaging properties and conductivity. The results showed that LDH used as costabilizer could enhance the thermal stabilities of PVC significantly,which also indicated that a strong synergistic effct between Ba/Zn and LDH. Finally, evaluation of the use of three different co-stabilizers for PVC stabilization were carried out by thermogravimetric analysis. The curves presented that all of them could improve the primeval thermal stabilities of PVC.