摘要： 用甲基丙烯酸羟乙酯( HEMA) 与一水合柠檬酸反应生成柠檬酸酯，然后将其与环氧树脂E-51 或者甲基丙烯酸缩水甘油酯(GMA)反应，利用环氧开环形成的仲羟基将环氧树脂引入到聚氨酯的主链中，制备了基于柠檬酸架构的水性光固化环氧-聚氨酯。 采用纳米粒度仪、光学接触角仪、电子拉力机等对胶膜的结构与性能进行了测试。 研究了环氧树脂 E-51 或 GMA 的加入对聚氨酯胶膜的耐水性、力学性能、硬度、水接触角、热稳定性的影响。 结果表明:随着 E-51 和 GMA 的加入，乳液粒径逐渐增大、分布变宽，胶膜热稳定性增强、吸水率大幅度降低、接触角增加;胶膜的拉伸强度和断裂伸长率大幅度增大。

关键词: UV 固化, 水性聚氨酯, 乳液, 环氧树脂, 柠檬酸, 改性

Abstract: A citrate was prepared by reaction of hydroxyethyl methacrylate(HEMA), and citric acid monohydrate, and then was reacted with epoxy resin(E-51) or glycidyl methacrylate(GMA) to form a citrate-modified E-51 or GMA which was further reacted with polyurethane prepolymer to obtain a waterbome UV-curable expoy-polyurethane The structure and properties of the cured film were characterized by particle size analyzer, optical contact angle measuring instruments and electronic tensile machine. The influence of E-51 or GMA content on the water resistance, mechanical property, hardness, water contact angle and the thermal stability of WPU film was investigated. The results showed that the addition of E-51 or GMA could result in the increase of emulsion particle size and distribution, and enabled the cured film to show the improved thermal stability, the decreased water absorption and the increased water contact angle, tensile strength and elongation at break.

Key words: UV curable, waterborne polyurethane, epoxy, citric acid, modification