采用二乙醇胺对双酚A型环氧树脂进行开环,再以甲乙酮肟为封闭剂,对聚氨酯预聚体的端-NCO基进行部分封闭,再结合开环后的环氧树脂,合成了一种稳定性良好、防腐性能优异的封闭型聚氨酯-环氧树脂复合乳液.研究了环氧树脂开环剂、聚氨酯预聚体的封闭程度以及环氧树脂用量对乳液和涂膜性能的影响,通过电化学方法和浸泡腐蚀实验研究了涂膜的防腐性能.结果表明:开环后的环氧树脂能显著提高乳液的稳定性,而耐腐蚀性变化不大;聚氨酯预聚体封闭程度为40％～43％时聚合物的交联度合适,乳液性能优异;随着环氧树脂用量增加,乳液粒径先减小后增大,涂膜防腐性能逐渐提高,且远优于非封闭型聚氨酯-环氧树脂成膜体系;环氧树脂用量可达24％左右.
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