以甲基丙烯酸-β-羟丙酯(HPMA)为羟基单体,采用种子乳液聚合、极性单体分段滴加工艺合成了高羟值(98.8 mgKOH/g)和高固含量(≥45.0%)的丙烯酸酯乳液,配制水性双组分丙烯酸酯聚氨酯涂料(2K-WPU),考查了羟值对聚合稳定性、乳液粒径和涂膜物理化学性能的影响,研究了水性双组分丙烯酸酯聚氨酯涂料合适的-NCO和-OH物质量的比.研究发现:羟值的提高会增加乳液聚合的凝胶率,降低单体的转化率,使乳液聚合稳定性下降,乳液粒径变大,分布变宽;涂膜硬度和交联度随羟值的增大而提高,涂膜光泽和耐介质性能分别在羟值为65.9 mgKOH/g和82.4 mgKOH/g时达到最佳;当n(-NCO)∶n(-OH)为1.5～1.8时,水性双组分丙烯酸酯聚氨酯涂膜的综合性能最佳.傅里叶红外光谱分析表明在涂膜形成过程中-NCO与-OH的固化反应完全需7 d,TGA分析了水性双组分聚氨酯涂膜的耐热性.
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