聚甲基丙烯酸酯改性聚氨酯光固化水性体系研究  

Polymethacrylate Modified Polyurethane as Photocurable Waterborne Coatings

作　　者：杨建文[1] 曾兆华[1] 王志明[1] 陈用烈[1] 

机构地区：[1]中山大学高分子研究所,广州510275

出　　处：《应用化学》2001年第8期631-635,共5页Chinese Journal of Applied Chemistry

基　　金：广东省自然科学基金资助课题 ( 96 0 0 19)

摘　　要：通过二羟甲基丙酸、聚乙二醇、甲苯 -二异氰酸酯及甲基丙烯酸 -β-羟乙酯合成了可在水中自乳化分散的侧链带羧基的聚氨酯丙烯酸酯 ( PUA) .将 PUA接枝到甲基丙烯酸甲酯 /甲基丙烯酸缩水甘油酯共聚物上 ,经胺中和后得自乳化丙烯酸树脂接枝聚氨酯体系 ( g-PUA) .两类预聚物水分散系的表面张力均远小于纯水 . DSC研究显示 ,接枝体系具有较高的光聚合转化率 .考察了聚乙二醇分子量等因素对固化膜玻璃化转变。A conventional polyurethane acrylate(PUA) with carboxyl as pendant group was prepared from dimethylolpropionic acid, polyethylene glycol, tolylene 2,4 diisocyanate and hydroxyethyl methacrylate. A modified PUA( g PUA) with carboxyl group was obtained by grafting the PUA onto the copolymer of glycidyl methacrylate and methyl methacrylate through the reaction between the glycidyl and part of the carboxyl groups. The PUA and g PUA could be easily dispersed in water in the form of self emulsified latex after neutralization by triethylamine. The interfacial tension of the acquired dispersions was lower than that of deionized water. The investigation of photocuring on differential photocalorimeter showed that the g PUA could polymerize to a greater extent than the conventional PUA. The glass transition termperature, thermal stability and physical properties of the cured films from the conventional PUA and the g PUA dispersions were measured. The effects of molecular weight of polyethylene glycol used on the above properties were also investigated.

关 键 词：光固化 水性涂料 聚氨酯丙烯酸酯 丙烯酸酯共聚物 接枝共聚物 相容性 

分 类 号：TQ630.6[化学工程—精细化工]