镁铝水滑石及其复合体系对PVC热稳定性能的调控  

Retardation of Thermo-oxidative Degradation of Paste PVC Resin by Mg-Al Layered Double Hydroxides

作　　者：张莉[1] 乔辉[1] 高翔[1] 刘忠磊[1] 吴立峰[1] 

机构地区：[1]北京化工大学材料科学与工程学院,北京100029

出　　处：《中国塑料》2005年第5期79-83,共5页China Plastics

基　　金：北京化工大学可控化学反应科学与技术基础教育部重点实验室开放课题

摘　　要：采用比色法、热失重法等研究了不同镁铝摩尔比的水滑石(LDHs)对PVC糊热稳定性能的影响。结果表明,在镁铝比分别为2、3、4的样品中,镁铝比为2的LDHs对PVC的热稳定效果最佳;将其与传统的铅盐、有机锡稳定剂复配,均具有良好的协同效应,可以实现对PVC糊热稳定性能的控制。其中,PVC/Mg-AlLDHs/Sn以100∶1.5∶1.5(质量份数,下同)比例复合后的体系,不仅热稳定性能优于传统的的铅盐体系,而且具有较低的糊黏度及较好加工流变性能。The effect of molar ratio of Mg^(2+)/Al^(3+) in hydrotalcites (LDHs), a layered double hydroxide, on the thermal stability of paste PVC resin was investigated using colorimeter and TGA. It was found that the molar ratio Mg^(2+)/Al^(3+)=2 constituted the optimum one. When the hydrotalcite was used together with lead salt or organotin, a synergistic effect on the thermal stability was observed. A system with weight ratios of PVC/LDHs/organotin=100/1.5/1.5, better higher tensile strength and lower viscosity were achieved in addition to excellent thermal stability.

关 键 词：镁铝水滑石 聚氯乙烯 热稳定性 协同效应 

分 类 号：TQ325.3[化学工程—合成树脂塑料工业]