一种黑色环氧聚氨酯阴极电泳漆

A kind of black epoxy-polyurethane cathodic electrophoretic coating

合成了3种封闭型多异氰酸酯固化剂并对其涂膜外观进行了比较。研究了各种封闭剂的解封温度及其对涂膜性能的影响。分别讨论了不同配比的固化剂与改性环氧树脂、颜料与基料以及各种分散剂等因素对涂膜性能的影响。按照最佳用量：m（固化剂）：m（改性环氧树脂）=1：4～5，m（颜料）：m（基料）=0．24：1：配合4560型润湿分散剂，运用封闭型异氰酸酯固化交联剂低温解封技术获得了一种烘烤温度较低、硬度达到3～4H、附着力达到1级且耐蚀性能优良的环氧聚氨酯型阴极电泳涂料。

Three kinds of blocked polyisocyanate curing agents were synthesized and their film＇s appearances were compared. The deblocking temperatureof various blocking agents and its influence on film＇s performance were studied. The influence of factors of different ratios between curing agent and modified epoxy resin, pigment and basic material, and various dispersants on film＇s performance was discussed. A kind of epoxy-polyurethane cathodic electrophoretic lacquer coating with low curing temperature, hard- ness of 3-4 H, adhesion of 1 grade and excellent corrosion resistantance performance was gained by low-temperature deblocking technique of blocked polyisocyanate crosslinking agent on the basis of the optimized dosage of m （curing agent） ： m （ modifiedepoxy resin） ： 1 ： 4-5, m （pigment）： m（ basic material） =0.24 ： 1 and using 4 560 wetting dispersant.