以二羟甲基丁酸(DMBA)、二羟基聚氧乙烯醚作亲水单体,醛酮树脂(KFR)、聚己二酸新戊二醇酯(PNA)、异佛尔酮二异氰酸酯(IPDI)为主要原料,采用预聚体法合成了阴/非离子型聚氨酯分散体(PUD).研究表明,PUD的ζ电位均大于-30 mV,具有良好的乳液稳定性,阴/非离子型PUD具有较低的表面张力和更好的钙离子稳定性.亲水基团含量(HGC)的增加,阴/非离子摩尔比、醛酮树脂用量、NCO/OH摩尔比的减少使胶粒平均粒径减小,乳液黏度增大.醛酮树脂改性PUD粒径呈现双峰分布.透射电镜显示分散体胶粒呈球形结构.醛酮树脂改性的PUD配制成水性涂料后,涂膜铅笔硬度可达4H,且涂膜具有优异的附着力、柔韧性和耐水性.
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