多官能度UV固化松节油基聚氨酯丙烯酸酯的研究

Study on the UV-curable multifunctional turpentine polyurethane acrylates

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%。

The polyester containing six terminal hydroxyl groups was prepared by trimethylolpropane（ TMP）,glycidol and self-made turpentine-maleic anhydride（ TMA）. The polyester was capped with toluene-2,4-diisocyanate（ TDI）. hydroxypropyl acrylate（ HPA） to obtain a UV-curable polyfunctional urethane acrylate（ PUA）.The prepared polyester and PUA were characterized by FT-IR. The effects of reactive diluent type and amount on the physical properties and thermal properties of the cured coating films were investigated by mechanical property testings and thermal gravimetric analysis. The results showed that the cured film has better overall performance using dipropylene glycol diacrylate（ DPGDA） and trimethylolpropane trimethacrylate（ TMPTMA） as complex reactive diluent,m（ DPGDA） ∶ m（ TMPTMA） = 4∶ 1 and mass fraction of 20 %. The cured film had good heat resistance. The initial decomposition temperature of was about 245 ℃ and the other decomposition temperature was about390 ℃. The light curing behavior studies by gel method showed that the final conversion rate of the unsaturate double bond was up to 92%.