阴极电泳清漆的制备及其在铝材上的应用研究

Preparation of Cathodic Electrodeposition Coating and Its Applica tion in Aluminum Substrate

将烯丙基缩水甘油醚与丙烯酸酯单体进行溶液共聚,甲基乙醇胺与分子主链中的环氧基开环引入含-N基团,与封闭聚氨酯和助剂混合,加入乳酸将其离子化,得到铝制工件用的阴极电泳清漆。通过对乳液的贮存稳定性和在铝制工件上的漆膜机械性能进行研究发现,当烯丙基缩水甘油醚占树脂质量的12%时,与以甲乙酮肟和3,5-二甲基吡唑为混合封闭剂、丙三醇枝化的异佛尔酮二异氰酸酯而制得的封闭聚氨酯混合,用乳酸中和至树脂中和度的49%时,可以得到稳定的电泳槽液。经电泳后,在140℃下烘烤30 min,得到的漆膜外观和综合性能最佳。

A cathodic electrodepositon coating for aluminum substrate was prepared via ionization of the composition by lactic acid which was prepared by blending of polyurethane and additives as well as the anionic acrylic resin obtained by copolymerization of allyl glycidyl ether and acrylate monomer wherein methylethanolamine conducted a ring-opening reaction with epoxy group.The storage stability of emulsion and its mechanical properties were investigated.The results showed that a stable electrodepostion solution could be prepared when the allyl glycidyl ether was 12%of the resin,methyl ethyl ketoxime and 3,5-dimethyl pyrazole were used as mixed sealing agent to be blended with the blocked polyurethane based on propanetriol-branched IPDI,and lactic acid was used to reach a neutralization degree 49%.The electrodepostion coating cured at 140℃for 30 min showed good film appearance and comprehensive performance