以季戊四醇为核、2，2-二羟甲基丙酸为臂，采用一步熔融法合成了含16个端羟基的超支化聚酯（HBPE）。利用异佛尔酮二异氰酸酯和丙烯酸-2-羟乙酯的半加成产物改性HBPE，制备了一系列末端含有不同数量CC的超支化聚氨酯丙烯酸酯（HBPUA），并对HBPUA涂料固化过程和固化膜性能进行研究。结果表明，HBPUA改性度越大、用量越多，涂料固化时间越短，CC转化率增大，固化膜的硬度增强，柔韧性和抗冲击性能减弱；当HBPUA质量分数超过60%时，涂料固化速度快，CC转化率大于90%，固化膜综合性能优异。

By using one-step molten polycondensation,hyperbranched polyester (HBPE) with 16 terminal hydroxyl groups is synthesized with pentaerythritol as core and 2,2-bis(hydroxymethyl) propionic acid as arm.A series of hyperbranched polyurethane acrylates (HBPUA) that contains different numbers of C=C at chain end are successfully prepared through further modifying the synthesized HBPE with the semi-addition product of isophorone diisocyanate and hydroxy-ethyl acrylate.The conversion of NCO group reaches 97.8%,and the synthesized HBPUA exhibits low viscosity and good thermal stability.UV-curing behaviors of HBPUA coatings and the mechanical properties of cured films are investigated.It is indicated that higher dosage and modification degree of HBPUA can shorten the curing time of HBPUA coatings,improve the conversion of C=C and the hardness of cured films,while the flexibility and impact strength decrease.If the content of HBPUA exceeds 60wt.%,the coatings cure rapidly,C=C conversion surpasses 90% and the cured films show excellent overall properties.

黎汉生(1972-),男,博士,副教授,研究方向为新型催化材料设计、绿色合成过程与工艺、能源化工,hanshengli@bit.edu.cn