| 摘要 |
[Problem] In a coating method of a two-coat one-bake system where a clear coat paint is coated after a base coat paint is coated, then these two coated layers are simultaneously hardened, adhesive strength between the two coated layers is to increase in comparison with the conventional method.;[Solution] Provided is a coating method; A specific hardener is used in the clear coat paint. The hardener is one containing a polyisocyanate derived from 1,6-hexamethylene diisocyanate, satisfying all the following conditions:
1) Hardener does not virtually include diisocyanate monomer,2) Viscosity of hardener is not more than 1000 mPa·s/23° C.,3) Content of HDI trimer in hardener is not less than 60 weight %, and4) Content of HDI dimer in hardener is less than 10 weight %. |
