采用己二酸己二醇酯(POL-556t)、磺酸盐接枝聚酯多元醇(BY3305)、多亚甲基多苯基异氰酸酯(PM-200)和六亚甲基二异氰酸酯(HDI)为主要起始原料,以磺酸盐/二羟甲基丙酸(DMPA)为复合亲水改性剂,环氧树脂(E-44)为交联改性剂,合成了一种固含量为45％的水性聚氨酯乳液,并用于制备ABS塑料底漆.研究了软硬段分子结构、E-44用量等对涂层力学性能、吸水率等性能的影响,并通过傅里叶变换红外光谱(FT-IR)对其化学结构进行了表征.结果表明:当n(BY3305)∶n(POL-556t)=6∶4、n(PM-200)∶n(HDI)=1∶6、w(E-44)=2.0％、w(DMPA)=5.0％时,涂膜可在60℃下30 min实干,对ABS基材的附着力0级、铅笔硬度HB～1H、柔韧性2 mm、光泽95.
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