摘要
The blocking reaction of polyisocyanates with active hydrogen containing subs tances and the deblocking of the reaction products have been investigated by IR and TGA. The results showed that the initial deblocking temperature of the blocked polyisocyanates were mainly determined by active hydrogen substances. The deblocking temperature of toluene diisocyanate blocked with methylethylketoxime was 110 ℃ and this temperature could be more or less reduced by using organic tin catalyst at deblocking reaction.
The blocking reaction of polyisocyanates with active hydrogen containing subs tances and the deblocking of the reaction products have been investigated by IR and TGA. The results showed that the initial deblocking temperature of the blocked polyisocyanates were mainly determined by active hydrogen substances. The deblocking temperature of toluene diisocyanate blocked with methylethylketoxime was 110 ℃ and this temperature could be more or less reduced by using organic tin catalyst at deblocking reaction.
出处
《应用化学》
CAS
CSCD
北大核心
2000年第2期222-223,共2页
Chinese Journal of Applied Chemistry
关键词
多异氰酸酯
活泼氢物质
封闭
解封闭
交联剂
polyisocyanate,active hydrogen substance,blocking,deblocking,organic tin com-pound
