以聚乙二醇、环氧树脂E20、间苯二甲胺(MXDA)为原料、过硫酸钾为催化剂,合成了一种非离子型常温固化自乳化型水性环氧固化剂。系统优化了反应温度、时间、催化剂用量以及原料配比对固化剂性能的影响,利用红外光谱对固化剂进行结构表征,测试了基于该固化剂乳化固化环氧树脂E44所得涂层的性能。结果表明:当过硫酸钾用量占环氧树脂和聚乙二醇总量的0.75%、n(环氧树脂)∶n(聚乙二醇)∶n(MXDA)=1∶1∶4,反应温度为180℃、时间为4 h时,所得涂膜的机械性能、耐腐蚀性能优异。

In this paper,a non-ionic room temperature self-emulsifying waterborne epoxy curing agent was synthesized using polyethylene glycol,epoxy resin E20,M-Xylylenediamine(MXDA)as raw materials and potassium persulfate as catalyst.The effects of synthesis reaction temperature,time,catalyst dosage and raw material ratio on the performance of the curing agent were systematically optimized.The structural character-ization of the curing agent was carried out using infrared spectroscopy,and the performance of the coating based on the emulsion curing of epoxy resin E44 with this curing agent was systematically tested.When the dosage of potassium persulfate accounted for 0.75%of the total epoxy resin and polyethylene glycol,the mo-lar ratio of epoxy resin,polyethylene glycol and MXDA was 1:1:4,and the reaction temperature was 180°C and the time was 4 h,the mechanical properties and chemical resistance of the obtained coating were excellent.