梳型紫外光快速固化聚氨酯的制备及涂层性能

以1,3-丙二醇、甲基丙烯酸缩水甘油酯为主要原料,无水四氯化锡为催化剂,三氟乙酸为助催化剂,合成了一种具有光化学活性的聚醚(PGMA)。此聚醚以碳氧键为主链,以甲基丙烯酸酯基为梳型侧链,端基为羟基。将上述具有光化学活性的聚醚(PMGA)与异佛尔酮二异氰酸酯(IPDI)反应,制得具有光化学活性的聚氨酯Poly(PGMA-IPDI)]。采用FTIR和~1HNMR对PGMA和Poly(PGMA-IPDI)进行表征。在上述聚氨酯中加入活性稀释剂和光引发剂,制备出一种能够快速光固化的树脂,固化时间可以达到1 s,柔韧性达到0.5 mm、附着力为最高级级,同时固化涂层在盐溶液、水溶液、碱溶液中浸泡无脱落,在酸性水溶液中脱落时间也达到36 h,涂层具有优异的性能。

Synthesis of the Comb-like Rapid UV-cured Polyurethane and Its Film Properties

Abstract: Using cationic polymerization method, the photoactive polyether ( PGMA ) was synthesized by 1,3-propanediol reacted with glycidyl methacrylate at presence of tin tetrachloride and trifluoroacetic acid as catalyst. The photoactive polyether was composed of the main chain of C-O-C band and comb-like side chain (glycidyl methacrylate), terminated by hydroxyl. The as-prepared PGMA reacted with isophorone diisocyanate to form the photoactive polyurethane (poly(PGMA-IPDI)). Finaly, adding active diluent and photoinitiator into poly(PGMA-IPDI) can produce a kind of UV resin, which exhibited the ability of rapid curing and excellent properties, such as flexibility, adhesion, water resistance, salt resistance, alkali resistance and high curing speed up to one second.