不同催化剂对硅烷接枝LLDPE水解交联反应的影响

摘要

The silane grafting linear low density polyethylene ( LLDPE) was basic material, threerndifferent catalysts, dibutyltin dilaurate (DBTDL) , stannous octoate and organo-titanate chelates (ZL-928)rnwas selected. Effects of content of the three catalysts and the time of hydrolysis on the gelation, heatrnextension properties and mechanical properties of the crosslinked LLDPE were studied. It was found that therngelation increased with the contents of catalysts, and did not change obviously with the contents reachingrn1. 6 g. The gelation, heat extension properties and mechanical properties increased with the contents ofrncatalysts and increased slowly after a certain value. Compared with the gelation, heat extension propertiesrnand mechanical properties, catalyst efficiency of the three catalyst was; stannousoctoate > DBTDL > ZL-928.%以硅烷接枝线性低密度聚乙烯(LLDPE)为基体,通过考察二月桂酸二丁基锡(DBTDL)、辛酸亚锡、有机钛螯合物(ZL-928)三种不同催化剂的用量以及水解交联时间对交联的线性低密度聚乙烯的凝胶率、热延伸及力学性能的变化规律,来研究不同催化剂对体系水解交联反应的影响.结果表明:凝胶率随着催化剂用量的增长而增加,当其用量增加到1.6g后,凝胶率不再有明显变化.交联后基体的凝胶率、热延伸和力学性能随水解时间的增加而增加,但是在一定时间之后增加趋势变缓.同时综合比较不同催化剂体系的的凝胶率、热延伸和力学性能发现,三种催化剂催化效率:辛酸亚锡＞ DBTDL＞ ZL-928.