低温固化阴极电泳涂料的制备与性能

Preparation and properties of low temperature curable cathodic electrodeposition coatings

采用乳液聚合法将N-羟甲基丙烯酰胺(N-MAM)和丙烯酸酯类单体加入到改性的环氧树脂乳液中进行接枝共聚,制备了一种能低温固化的阴极电泳涂料。通过FT-IR,DSC和SEM等手段对树脂结构进行了表征与分析,并研究了自交联单体N-MAM对涂料性能的影响。结果表明:与传统的溶液接枝改性技术相比,此方法可以在低于90℃的低温条件下反应,将改性树脂中N-MAM的质量分数提高至10%,制得的漆膜可在130℃,30 min的条件下固化。

Novel cathodic electrodeposition （CED） coatings, which were self-curable without using any external/ additional cross-linking agent, have been developed from a modified epoxy resin emulsion grafted from N-hydroxymethyl acrylamide （N-MAM） and acrylic monomers through emulsion polymerization. The resin structure has been characterized by FT-IR, DSC and SEM. The effects of varying the dosage of self-crosslinking monomer N-MAM on the properties of the coating were investigated. The results showed that self-curing of the cathodically deposited films could be effected at a low temperature of 130 ℃ in 30 min. The reaction temperature can be reduced significantly to lower than 90 ℃ and the mass fraction of N-MAM in the modified resin can be increased to 10 %. Thus, the cross-linking degree of the coating can be increased and the physical and mechanical properties of the film improved compared to films prepared by traditional solution grafting techniques.