聚氨酯改性环氧树脂耐磨涂料的研制

以2,4-甲苯二异氰酸酯和蓖麻油为原料,合成了聚氨酯预聚体。使用该聚氨酯预聚体对环氧树脂进行了改性。对各种固化剂进行了筛选。最后研制了一种双组分常温固化耐磨涂料。通过正交实验和单因素实验确定了涂料的最佳配方:聚氨酯5 g,环氧树脂10 g,填料3 g,固化剂2．3 g。由此获得的耐磨性优良的涂膜性能为:表干时间10 h,实干时间不到40 h;耐磨性实验中,磨痕弦长5．4 mm;附着力0级,硬度5 H。

Preparation of polyurethane modified epoxy resin wear-resistant coatings

The performed polymer of polyurethane was synthesized with 2, 4-tolylene diisocyanate and castor oil as materials. The epoxy resin was modified by the polyurethane. Various curing agents used for the coatings were selected. The two- component wear-resistant coating was eventually prepared which was cured at environmental temperature. The optimized formula of coatings was ascertained by the orthogonal test and single factor test as follows: 5 g of polyurethane, 10 g of epoxy resin,3 g of filling and 2.3 g of curing agent. The film gained from the formula has excellent wear-resistant properties as follows: surface drying time of 10 h, actual drying time less than 40 h, chord length of wear trace of 5.4 mm in the wearresistant test, adhesion of grade 0 and 5 H of hardness.