In this paper, a series of UV-curable waterborne polyurethane–acrylate (WPUA) emulsions were synthesized by using isophorone diisocyanate (IPDI) as the hard segment, polybutylene adipate glycol (PBAG) and different dosages of hydroxyl-terminated polydimethylsiloxane (HTPDMS) as the soft segment, 2,2-dimethylolpropionic acid (DMPA) as hydrophilic chain extender, and pentaerythritol triacrylate (PETA) as the blocking agents. The properties of the WPUA emulsions were then characterized by using Fourier transform infrared spectrometry, Zeta potential analysis, dynamic light scattering, and UV-cured films were characterized through Fourier transform infrared spectrometry, X-ray photoelectron spectroscopy, scanning electron microscope, UV–vis spectrophotometer, and thermogravimetric analysis, as well as by measuring the contact angle of water, testing the water absorption. The results indicated that with increasing HTPDMS content in the WPUA, the particle size of the emulsion was increased significantly, while the absolute value of Zeta potential was increased slightly. The resistance of WPUA cured film to water was increased. The ultimate water absorption declined from 11.12 % to 6.81 % and the equilibrium time of water absorption extended from 50 h to more than 100 h. When the HTPDMS content of WPUA was 10.0 wt%, the water contact angle of the cured film was the largest at 114°, which indicated that the surface of the cured film has been changed from a hydrophilic surface to a hydrophobic one. Thermogravimetric analysis results showed that the initial decomposition temperature of WPUA film gradually increased with adding of HTPDMS, performing better thermal stability.

本文以异佛尔酮二异氰酸酯（IPDI）为硬链段，聚己二酸己二酸丁二醇酯（PBAG）和不同剂量的羟基封端的聚二甲基硅氧烷（HTPDMS）为原料，合成了一系列紫外光固化水性聚氨酯-丙烯酸酯（WPUA）乳液。软链段中，2,2-二羟甲基丙酸（DMPA）作为亲水性扩链剂，季戊四醇三丙烯酸酯（PETA）作为封闭剂。然后，通过傅里叶变换红外光谱法，Zeta电位分析，动态光散射来表征WPUA乳液的性能，并通过傅里叶变换红外光谱法，X射线光电子能谱，扫描电子显微镜，UV-vis表征UV固化膜。分光光度计，热重分析以及通过测量水的接触角，测试吸水率。结果表明，随着WPUA中HTPDMS含量的增加，乳液的粒径明显增加，而Zeta电位的绝对值略有增加。WPUA固化膜对水的抵抗力增加。最终吸水率从11.12％下降到6.81％，平衡吸水时间从50h延长到100h以上。当WPUA的HTPDMS含量为10.0重量％时，固化膜的水接触角最大为114°，这表明固化膜的表面已经从亲水性表面变为疏水性表面。热重分析结果表明，随着HTPDMS的加入，WPUA膜的初始分解温度逐渐升高，具有较好的热稳定性。