An object of the present invention is to provide a coating composition that has excellent throwing power and electrodeposition coating applicability onto hot dip galvanized steel sheets, and that provides a cationic electrodeposition coating film having a superior finish and excellent anti-corrosion properties, and a multilayer coating film with a superior finish formed on the cationic electrodeposition coating film by a 3C1B process.
The present invention provides a cationic electrodeposition coating composition having amino group-containing epoxy resin (A) obtained by reacting epoxy resin (A1) having an epoxy equivalent of 500 to 2,500 with amine compound (A2); and blocked polyisocyanate curing agent (B).
本发明的目的是提供一种涂层组合物,具有良好的喷涂性能和电泳涂层适用性,可涂覆在热浸镀
锌钢板上,并提供一种阳离子电泳涂层膜,具有优异的光泽和防腐性能,以及通过3C1B工艺形成在阳离子电泳涂层膜上的优异光泽的多层涂层膜。本发明提供了一种含
氨基环氧
树脂(A)的阳离子电泳涂层组合物,所述
氨基环氧
树脂(A)是通过将环氧
树脂(A1)与胺化合物(A2)反应而得到的,其环氧当量为500至2500;以及阻化型聚
异氰酸酯固化剂(B)。