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首先制备了PUD-SH[多巯基封端的PU(聚氨酯)水分散体]和水性EP(环氧树脂),然后将两者按n(巯基)∶n(环氧基)=1∶1复合,并在不同温度时成膜,制得厚度约100μm的复合固化涂层。研究结果表明:PUD-SH和水性EP之间发生了环氧基开环反应,固化后复合涂层透明柔韧,其凝胶量接近100%,涂层的吸水率<17.50%,硬度>6H,耐甲乙酮擦拭次数>1 600次;固化时叔胺促进剂的存在可有效提高复合固化涂层的固化度,缩短其固化时间,但对其他性能影响甚微。
First PUD-SH [poly-mercapto-terminated PU dispersion] and water-borne EP (epoxy resin) were prepared and then both were compounded with n (mercapto) And filming at different temperatures to obtain a composite cured coating with a thickness of about 100 μm. The results showed that the ring-opening reaction of epoxy between PUD-SH and water-borne EP occurred. After curing, the composite coating was transparent and flexible. The gel content was close to 100%. The water absorption of the coating was less than 17.50% Methyl ethyl ketone wipe times> 1 600 times; curing tertiary amine accelerator presence can effectively improve the cure rate of the composite cured coating, shorten the curing time, but little effect on other properties.