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Cathodic electrodeposition coating composition with improved appearance, improved edge coating and reduced craters
Cathodic electrodeposition coating composition with improved appearance, improved edge coating and reduced craters
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机译:具有改善的外观,改善的边缘涂层和减少的缩孔的阴极电沉积涂料组合物
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摘要
A cathodic electrocoating composition comprises an aqueous carrier, a film forming binder, comprising an epoxy-amine adduct and a blocked polyisocyanate crosslinking agent, dispersed in the carrier, and a novel additive comprising the reaction product of (1) a polyoxy alkylene di or monoamine; (2) a glycidoxy alkyl alkoxy silane; and (3) a glycidyl compound selected from the group consisting of a glycidyl ester of a carboxylic acid and an alkyl glycidyl ether, which reaction product is hydrolyzed in the presence of acid and water to convert alkoxysilane moieties to silanol moieties. The electrocoat composition produces coatings having a smoother appearance with better edge coverage and fewer craters.
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