热稳定剂对PVC抑烟作用及其机理研究  

Smoke Suppression of Thermal Stabilizers on PVC and Its Mechanism

作　　者：陈深情[1] 熊雷[1] 皮红[1] 陈光顺[1] 郭少云[1] 

机构地区：[1]高分子材料工程国家重点实验室四川大学高分子研究所,四川成都610065

出　　处：《高分子材料科学与工程》2007年第2期206-210,共5页Polymer Materials Science & Engineering

基　　金：国家高技术研究发展计划(863计划2003AA333010)

摘　　要：利用烟密度箱、TG、GC-MS等分析技术研究了钙锌、铅盐和有机锡热稳定剂对PVC的抑烟作用及对燃烧过程中主体凝聚相和释放的芳烃化合物的影响,并探讨了钙锌稳定剂的抑烟机理。结果表明:这三类热稳定剂对PVC均有一定的抑烟作用,其中钙锌稳定剂的抑烟作用更为明显。钙锌稳定剂通过燃烧过程中生成的ZnCl2改变PVC热降解历程:一方面抑制分子内环化反应,减少有害芳烃化合物的生成;另一方面能促进分子间交联反应,提高残炭量,起到抑烟作用。The gas phase and condensed phase of PVC and PVC/stabilizers systems during thermal decomposition were studied by means of smoke density chamber, thermogravimetry and gas chromatography-mass spectroscopy （GC-MS）, and discussed the mechanisms of smoke suppressant action. The experimental results demonstrate that the stabilizers have positive effect on smoke suppression of PVC. The activity of Ca-Zn stabilizers change the decomposition process of PVC via ZnCl2formed during decomposition： On one hand, ZnCl2 can restrain the intramolecular cyclization reactions, and reduce the total output of aromatic compounds during decomposition of PVC. On the other hand, it can promote the crosslinking reactions during decomposition and increase the char residue.

关 键 词：聚氯乙烯 热稳定剂 抑烟机理 气相色谱-质谱联用 热分析 

分 类 号：TQ325.3[化学工程—合成树脂塑料工业]