改性水滑石在钙锌复合稳定剂中的应用研究

Study on the Application of Modified LDHs in Ca/Zn Compound Heat Stabilizer

介绍了改性水滑石的结构、作用机理及改性的关键技术,并比较了改性水滑石、硬脂酸钙、硬脂酸锌、硬脂酸钡、三盐在PVC体系中的热稳定性能以及协同稳定性能。重点研究金属皂与改性水滑石类热稳定剂复配用量对PVC脱氯化氢反应的影响,同时比较了复配有改性水滑石的钙锌复合稳定剂与三盐的热稳定性,结果表明复配改性水滑石产品的钙锌系列不仅明显改善PVC初期着色性,而且长期热稳定性能也大幅提高,完全可以替代铅盐使PVC电缆料达到国标要求。

The structure, function mechanism and modification＇s key technology of modified hydrotalcite （LDHs） were introduced. The heat stabilities and synergism of modified LDHs, CaSt, ZnSt, BaSt and trlbasic lead sulphate （TLS） in the PVC composite were compared. The effect of the mass weight ratio of metal stearte and modified LDHs in compound stabilizer on dehydrohalogenation was researched emphatically, and the heat stabilites of Ca/Zn compound stabilizer containing modified LDHs and TLS were compared. The test results show that the former not only has better initial color-change property, but also has better long heat stability, so it can instead lead salts to use in PVC cable compound which reach the national standard.