| 摘要 |
PURPOSE:To enhance scratch resistance and chipping resistance, by forming a cationic electrodeposition paint film, a barrier coat film, an intermediate coat film and a top coat film, each of which has specific film capacity, to a steel plate. CONSTITUTION:A cationic electrodeposition paint, wherein 40-150pts.wt. of pigment is compounded with 100pts.wt. of a resin solid, is applied to a steel plate subjected to chemical forming treatment and cured under heating. Thereafter, a composition based on a modified polyolefin resin, of which the static glass transition temp. of a foamed film is -30--60 deg.C and the tensile breaking strength elongation is 200-1,000% in an atmosphere of -20 deg.C, is applied to the cured paint film as barrier coat. Subsequently, an intermediate coat comprising org. solvent type thermosetting resin is applied to the barrier coat surface and, thereafter, a top coat forming an ultra-hard paint film excellent in finishing appearance and weatherability and having good scratch resistance is applied.
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