Abstract: An UV curable epoxy prepolymer(EA)containing more hydrophilic groups was synthesized with DMPA, acrylic acid(AA)and epoxy resin(E-51), which was reacted with maleic anhydride and neutralized with alkali to form a waterborne UV curable epoxy prepolymer(M-EA). The influence of reaction conditions such as reaction temperature, catalyst content on the reaction rate and the influence of the molar ratio of DMPA on the viscosity of the EA and water solubility of the product were disscussed. The results showed that the optimumreaction conditions of EA were as follows: DMPA: AA mole ratio was 3: 7, reaction temperature 100 ℃, BDMA 1.0%, reacting time 200 min. The optimum reaction temperature of MEA was 90 ℃/150 min. And finally prepolymer provided good comprehensive performance with water solubility 16. 2%, film curing time 37 s and the hardness 2 H.

Key words: UV curing, waterborne epoxy prepolymer, synthesis

摘要： 利用 2,2－二羟甲基丙酸（DMPA）与丙烯酸（AA）、环氧树脂（E-51）进行反应，合成具有较多羟基基团的 EA，再利用顺丁烯二酸酐（MA）与前述羟基反应引入尽可能多的亲水基团合成M-EA，中和成盐后制得水溶性 UV固化环氧预聚物。讨论了反应温度、催化剂用量对反应速率的影响；DMPA含量对 ＥＡ黏度、预聚物的水溶性以及涂膜固化时间的影响。并通过红外光谱（FT-IR）对EA结构进行表征。结果表明：合成 EA的最佳工艺条件为：n（DMPA）∶n（AA）为 3∶7，反应温度100℃，N,N－二甲基苄胺（BDMA）用量 1%，反应时间为 200min。合成 M-EA的反应温度为 90℃，反应时间为 150min。获得的预聚物含水量为 16.2%；涂膜光固化时间为 37s，硬度为 2H，综合性能较好。

关键词: 光固化, 水溶性环氧预聚物, 合成