非离子型自乳化水性环氧树脂的制备与性能

Preparation and Properties of Nonionic Self-Emulsified Waterborne Epoxy Resin

以对甲氧基聚乙二醇苯甲胺(p-MPEGBA)和双酚A环氧树脂E44为原料合成了非离子型自乳化水性环氧树脂(MPEGE44)。研究了聚乙二醇(PEG)链段分子量(M-PE)对MPEGE44水乳液分散相粒径和D230-MPEGE44固化产物力学性能和耐水性能的影响规律。结果表明,在环氧树脂分子结构中引入化学连接的PEG链段有利于提高MPEGE44的亲水性和交联网络中环氧树脂链段的应变松弛速率。增加-MPE,乳液分散相粒径变小、粒径分布变窄;D230-MPEGE44固化产物的玻璃化转变温度降低,柔韧性、耐冲击性和吸水率增加。-MPE=400时可制备出同时具有优异耐冲击性能和低吸水率的D230-MPEGE44环氧树脂。

A new kind of nonionic self-emulsified waterborne epoxy resin （MPEGE44） containing hydrophilic polyether segment was synthesized by using bisphenol A epoxy resin （E44） and p-methoxypolyethylene glycol benzylamine （p-MPEGBA）. The impact mechanical properties and water absorption of the D230-MPEGE44 cured products were investigated as functions of flexible PEG chain length （PE）. The results show that a waterborne epoxy resin is available by incorporating PEG segment into epoxy resin molecular structure via chemically linked with E44,beneficial for increasing hydrophilicity and strain relax rates. With the increase of PE,the average particle size of MPEGE44 emulsions decreases from 136.7 nm （PE=400） to 43.1 nm （PE=600）. The glass transition temperature decreases while the flexibility,impact resistance and water absorption increase. Consequently,the D230-MPEGE44 cured product exhibits good properties especially of low water absorption and excellent impact resistance when PE=400.