紫外光固化脂环族环氧丙烯酸酯涂料的制备及性能

摘要

UV curable cycloaliphatic epoxy acrylate resin（CEA） was synthesized by ring opening reaction of acrylic acid（AA） and cycloaliphatic epoxy resin.The product was characterized by FT-IR.The influences of reaction temperature and time on the conversion rate were discussed.Prepolymers of the coating were prepared with reactive diluents and CEA,viscosity of which was measured by viscometer.UV cured films of the prepolymers were analyzed by DSC,TG and pencil hardness tester.Results showed that when the molar ratio of acrylic acid and epoxy group was 1.03,the conversion rate of the reaction reached 96.58% at 120 °C for about 25.8 h.The glass transition temperature（Tg） of CEA cured film was 64 °C and the initial decomposition temperature was 314 °C.With the addition of reactive diluents,heat-resistance of the cured films was enhanced.Pencil hardness of the films could reach 6 H.%通过丙烯酸（AA）与脂环族环氧树脂的开环反应合成了可紫外光（UV）固化的脂环族环氧丙烯酸酯树脂（CEA）。采用红外光谱（FT-IR）对树脂结构进行了表征,研究了反应温度、反应时间对产率的影响。用活性稀释剂与CEA制备了涂料预聚物,用转板黏度计测定了预聚物的黏度,采用差示扫描量热（DSC）仪、综合热分析仪和铅笔硬度计对树脂固化膜进行了分析。结果表明：当丙烯酸与环氧基团摩尔比为1.03,120°C下反应25.8 h时,反应转化率可达96.58%。CEA固化膜的玻璃化转变温度为64°C,初始分解温度为314°C,活性稀释剂的加入增强了固化膜的耐热性,固化膜铅笔硬度可达6H。