WATER-BASED METALLIC COATING COMPOSITION AND METHOD OF FORMING MULTILAYERED COATING FILM

摘要

A water-based metallic coating composition which retains excellent properties of water-based metallic coating materials, such as coloration, adhesion in re-coating, unsusceptibility to chipping, and wet adhesion, and which, when applied by the two-coat one-bake coating method, gives a coating film less apt to suffer the disordering of brightening-pigment orientation through the application of a clear coating material. The coating film does not change in flip-flop effect and retains the excellent flip-flop effect. Also provided are: a method of two-coat one-bake coating which employs the coating composition; and a multilayered coating film which is obtained from the coating composition and has excellent flip-flop effect. The water-based metallic coating composition comprises a film-forming resin, a hardener, and a brightening pigment, and is characterized in that the film-forming resin comprises an acrylic resin emulsion, the acrylic resin emulsion being one obtained by two-stage emulsion polymerization, the solid resin ingredient in the emulsion having an acid value of 1-30 mg-KOH/g and a hydroxyl value of 10-150 mg-KOH/g, and the emulsion having a particle diameter of 20-140 nm and the hardener is an aqueous hydrophobic-melamine-resin dispersion having a particle diameter of 20-140 nm.