Abstract: A waterbome UV curable polyurethane acrylate resin (UV-WPUA) was synthesized by multistep method using toluene diisocyanate(TDI), polyethylene glycol(PEG)with different molecular weight, 1, 4-butanediol (1 4-BDO), 2, 2-dimethylol propionic acid(DMPA),hydroxyethyl methacrylate (HEMA) and triethylamine(TEA)as raw materials, and characterized by FT-IR. The resulted resin showed good transparent and appearance, high solid content and excellent water solubility. The optimal photoinitiator system and drying process were determined viareal-time FT-IR monitoring double bond conversion. The effect of polyethylene glycol with different molecular weight on performance of the cured film was studied. The results showed that a Uv-WPUA comprising photoinitiator (Irgacurel1173)5% and PEG with molecular weight 800 gave a higher double bond conversion and the best properties of the cured film thereof.

Key words: waterbome resin, UV curing, polyurethane acrylate, realtime FT-IR

摘要： 采用甲苯二异氰酸酯（TDI）、不同相对分子质量的聚乙二醇（PEG）、1,4－丁二醇（1,4-BDO）、2,2－二羟甲基丙酸（DMPA）、甲基丙烯酸羟乙酯（HEMA）、三乙胺（TEA）等为原料，以分步法合成环保型水性紫外光固化聚氨酯丙烯酸酯树脂（UV-WPUA），并通过红外表征其结构，合成的 UV-WPUA 树脂具有良好的外观透明性、较高的固含量和优异的水溶性。 通过实时红外（FT-IR）跟踪双键转化率确定较优的光引发体系和干燥工艺，并研究不同相对分子质量的聚乙二醇对固化涂膜性能的影响，结果表明当光引发剂 Irgacure1173 的用量为树脂用量的 5%，PEG 相对分子质量为 800 时，双键达到较高转化率且涂膜的综合性能最优。

关键词: 水性树脂, 紫外光固化, 聚氨酯丙烯酸, 实时红外