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以三羟甲基丙烷(TMP)、环氧丙醇及自制的松节油-马来酸酐(TMA)为原料,制备含有6个端羟基的聚酯,再以甲苯-2,4二异氰酸酯(TDI)、丙烯酸羟丙酯(HPA)进行封端,得到可UV固化的多官能度聚氨酯丙烯酸酯(PUA)。采用红外光谱(FT-IR)分别对制备出的聚酯及PUA进行了表征,并应用力学性能测试、热重分析考察了活性稀释剂种类及用量对固化涂膜物理性能和热性能的影响。结果表明:采用二丙二醇二丙烯酸酯(DPGDA)和三羟甲基丙烷三甲基丙烯酸酯(TMPTMA)复配活性稀释剂,m(DPGDA)∶m(TMPTMA)=4∶1,添加质量分数为20%时,固化膜综合性能较佳,固化膜初始分解温度约为245℃,另1分解温度约为390℃,耐热性能较好;利用凝胶法研究PUA的光固化行为表明其不饱和双键的最终转化率高达92%。
Polyester with six terminal hydroxyl groups was prepared from trimethylolpropane (TMP), glycidol and homemade turpentine-maleic anhydride (TMA), then toluene-2,4 diisocyanate (TDI) , Hydroxypropyl acrylate (HPA) were terminated to give UV-curable polyfunctional urethane acrylate (PUA). The prepared polyester and PUA were characterized by FT-IR, and the mechanical properties were tested. The effects of the type and amount of reactive diluent on the physical and thermal properties of the cured coating were investigated. The results showed that m (DPGDA): m (TMPTMA) = 4:1 was prepared by dipropylene glycol diacrylate (DPGDA) and trimethylolpropane trimethacrylate (TMPTMA) 20%, the cured film has better overall performance, the initial decomposition temperature of the cured film is about 245 ℃, the other decomposition temperature is about 390 ℃, and the heat resistance is better. The photocurable behavior of the PUA by the gel method shows that it is not saturated The double bonds have a final conversion of up to 92%.