Based on polyurethane acrylate ( PUA) as the binder, the formulation and film properties of UV curing coatings for PET has been developed. The PUA oligomer was screened and the effect of oligomer's structure on the adhesion, hardness and flexibility of the coatings was discussed. The effect of the type and amount of reactive diluent and the photoinitiator on film properties was studied. The appropriate formula of UV curing coating for PET protective film; oligomer 48. 0% (5# resin) ; TMPTA 24. 0% , TPGDA 24. 0% ; photoinitiator 3. 2% [m(Darocur 1173): m(Irgacure 184) =2:1]. The test results showed that the film hardness was 3H, adhesion was 100% , flexibility was 2 mm and the alcohol resistance was over 150 times, meeting the equirement of the PET protective film.%以聚氨酯甲基丙烯酸酯(PUA)为主体,进行了PET膜用UV固化涂料配制及涂层性能研究.对PUA低聚物进行了筛选,探讨了低聚物结构对涂层附着力、硬度、柔韧性等性能的影响,以及活性稀释剂、光引发剂的种类、配比、用量等因素对涂层性能的影响.获得了较适宜的PET膜用UV固化涂料配方:低聚物采用5#树脂,其用量为总量的48.0％；活性稀释剂组成为m(TMPTA)∶m(TPGDA)=1∶1,其用量为总量的48.0％；光引发剂组成为m(Darocur 1173)∶m(Irgacure 184)=2∶1,其用量为总量的3.2％.经测试,制得的涂膜附着力达100％,硬度3H,柔韧性2 mm,耐酒精擦拭大于150次,可满足PET保护膜硬化处理应用要求.
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