A kind of novel water-soluble hyperbranched polyurethane acrylate was synthesized based upon the raw materials of toluene 2, 4-diisocyanate ( TDI), hydroxypropyl acrylate ( HPA), succinic anhydride and hyperbranched aliphatic polyester(HBPE). The transformations of different groups were characterized using Fourier transform infrared during the synthesis process. The thermal properties of the UV-curable films show that thermal degradation temperature increases from 171.0℃ to 238. 9℃ , and the glass transition temperature by 56. 2℃ up to 72. 8℃ with increasing acrylate group content in the polymers. The mechanical properties of the UV-curable films of the water-soluble hyperbranched polyurethane acrylates were measured. The results show that the pencil hardness increases with TDI · HPA content increasing in the polymers, but the flexibility and impact strength are degressive trend.%以甲苯-2,4-二异氰酸酯、丙烯酸羟丙酯、丁二酸酐、自制超支化聚酯为原料,合成了一种新型可紫外光固化的水性超支化聚氨酯丙烯酸酯,采用傅里叶变换红外光谱分析了其合成过程中基团的变化.固化膜热分析表明,随着超支化聚氨酯丙烯酸酯中端丙烯酸酯基含量的增加,热降解温度从171.0℃升高到238.9℃,玻璃化转变温由56.2℃升高到72.8℃；其力学性能测试表明,随着TDI· HPA含量的增加,硬度增加,而柔韧性和抗冲击强度都呈递减的趋势.
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