Verfahren zur Herstellung von Mehrschichtlackierungen

摘要

A method of forming a multi-layer paint film comprises applying a cationic electrodeposition paint followed by a water based intermediate coat and heating to cure both the electrodeposited film and the intermediate film. A cross-linking curing reaction is controlled in the electrodeposited paint film such that it starts before a cross-linking curing reaction in the intermediate coat. A method of forming a multi-layer paint film (I) comprises applying a cationic electrodeposition paint (A) containing a block polyisocyanate as a cross-linking agent on a surface of a painted matter; applying a water based intermediate coat (B) containing a block polyisocyanate compound as a cross-linking agent on an electrodeposition paint film surface without curing to form an intermediate paint film followed by heating to cure both the electrodeposited film and the intermediate coat to form (I). (A) contains at least 10 pts.wt. of a tin base catalyst (w.r.t. 100 pts.w.t resin solids) and a cross-linking curing reaction is controlled in the electrodeposited paint film such that it starts before a cross-linking curing reaction in the intermediate paint film. An independent claim is included for an article coated by the method.