Abstract: A new preparation method of waterborne polyurethane acrylate was developed.With this method the hydrophilicity of polyurethane acrylate was improved by assembling ionic groups on the molecular structure of chain extender, and the immiscibility of polyurethane acrylate with water was resolved.The polyurethane acrylate prepared by this method was characterized by Fourior-transformed infrared spectroscopy（FTIR)and 1H nuclear magnetic resonance（¹H NMR).Its stability with water, viscosity, electron beam curing behavior and cured properties were studied.The results showed that the as-prepared product had water storage stability and the emulsion particle sizes decreased with increasing water content in the range from 0.50 to 0.75.The product properties cured by electron beam, such as thermal stability, hardness, adhesion, gloss, flexibility were excellent.

Key words: waterborne polyurethane acrylate, chain extender, electron beam curing

摘要： 研究了一种制备水性聚氨酯丙烯酸酯的新方法，通过在扩链剂分子结构中组装离子基团来改善亲水性，解决了聚氨酯丙烯酸酯与水难相溶的问题。采用这种方法制备了一种聚氨酯丙烯酸酯产物，使用FTIR和1H NMR对产物结构进行了表征。对产物与水的储存稳定性、黏度、电子束固化行为及固化后性能进行了研究。结果表明，分散乳液储存稳定性好，经电子束固化后性能(如硬度、附着力、光泽度、柔韧性、热稳定性)优良。

关键词: 水性聚氨酯丙烯酸酯, 扩链剂, 电子束固化