| 摘要 |
PROBLEM TO BE SOLVED: To provide a coating method by which a laminated coating film can be obtained with its uppermost layer having a surface of slight unevenness even if the uppermost layer and one or more of lower layer(s) are cured by baking after laminating two or more species of paint by a wet-on-wet method. SOLUTION: The coating method for forming a laminated coating film comprising at least a lower layer and an uppermost layer formed on a substrate includes: a step of preparing, as paint for forming the uppermost layer, thermosetting paint that has a curing temperature T<SB>T</SB>of≥40°C and≤200°C and does not generate a volatile matter upon being subjected to a heat treatment, and further preparing thermosetting paint for the lower layer, which has a curing temperature T<SB>U</SB>satisfying the following equation (1): T<SB>U</SB>≤T<SB>T</SB>-30 (wherein T<SB>U</SB>is a curing temperature [°C] of the paint for the lower layer, and T<SB>T</SB>is a curing temperature [°C] of the paint for the uppermost layer) as at least one of the paint for forming the lower layer; a step of forming an uncured laminated coating film by laminating the paint for the lower layer and the paint for the uppermost layer on the substrate using a wet-on-wet method; a step of setting T<SB>L</SB>(a temperature [°C] for lower-temperature heating) and T<SB>H</SB>(a temperature [°C] for higher-temperature heating) so that T<SB>L</SB>and T<SB>H</SB>are each within respective specific temperature ranges; and a step of subjecting the uncured laminated film to a heat treatment at the temperature T<SB>L</SB>and at least curing the paint for the lower layer to form a laminated coating film where the paint for the uppermost layer is uncured, and further subjecting the resulting uncured laminated coating film where the uppermost layer is uncured to a heat treatment at the temperature T<SB>H</SB>to cure the paint for the uppermost layer. COPYRIGHT: (C)2009,JPO&INPIT
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