摘要
本文研究了硅烷接枝聚乙烯的水解交联反应.所得交联产物是以LDPE、过氧化物和不饱和硅烷为基本原料,首先通过挤出熔融法将不饱和硅烷接枝到聚乙烯分子链上,然后将接枝物进行水解交联反应制得.通过实验,研究了接枝率、水解时间、水解温度、交联促进剂、试样厚度对交联度的影响.当接枝率(用吸光度比表示)在0.5以内时,接枝物在100℃水乳液中水解交联可得到凝胶量(表示交联度)在80%以下的任何产物;凝胶含量在水解初期随时间的增长而增加,当水解反应进行3h后,凝胶含量不再有明显增加;交联反应速度在高温下比在低温下快,水温控制在60～80℃为宜;本交联反应以丁基锡为促进剂,它起到了良好的交联促进作用;试样厚度对交联速度有一定的影响,要达到相同的凝胶含量,厚制品比薄制品需要更长的水解反应时间.
The hydrolytic crosslinking reaction of silane-g-PE is studied in this paper. With LDPE as basic material and peroxide and unsaturated silane as additives,the silane was grafted onto PE molecular chain by melt extrusion,and then a crosslinked product was prepared by means of the hydrolitic crosslinking reaction of the graft product. The effects of the graft ratio,hydrolysis time and temperature,the catalyst and sample thickness on the degree of crosslinking were studied. When the graft ratio (absorbance ratio) was within 0. 5, the crosslinked product with a gelation(gegree of crosslinking) <80% could be prepared by the hydrolytic crosslinking reaction of the graft product in an aqueous emulsion at 100℃ ;the gelation increased with the increase of the time at the beginning of the hydrolysis,and did not increase obviously with the increase of the time 3 hours after the beginning; the crosslinking reaction at high temperature was more rapidly than that at low temperature,and it was better to keep the water temperature at 60~80℃. In the crosslinking reaction butyl tin was used as promoter, and it had a good promotion for the crosslinking;the thickness of the sample had effect on the velocity of the crosslinking,and for a same gelation the hydrolysis time for thick product was longer than that for thin product.
出处
《塑料工业》
CAS
CSCD
北大核心
1996年第1期56-58,共3页
China Plastics Industry
