The invention provides a multilayer coating film-forming method that allows formation of a multilayer coating film with excellent smoothness, sharpness and water resistance, and which avoids or minimizes pinhole popping. The multilayer coating film-forming method of the invention has the following construction. A multilayer coating film-forming method comprising the following steps (1) to (4): step (1): coating an article to be coated with an aqueous first pigmented coating composition (X), step (2): coating the article to be coated, with an aqueous second pigmented coating composition (Y), step (3): coating the article to be coated, with a clear coating composition (Z), and step (4): heating an uncured first pigmented coating film, uncured second pigmented coating film and uncured clear coating film to cure them, wherein the aqueous first pigmented coating composition (X) contains a blocked polyisocyanate compound with a specific blocked isocyanate group.
本发明提供了一种多层涂膜成膜方法,该方法可形成光滑度、锐利度和耐
水性极佳的多层涂膜,并可避免或尽量减少针孔爆裂。本发明的多层涂膜成膜方法具有以下结构。一种多层涂膜成膜方法,包括以下步骤(1)至(4): 步骤(1):用
水性第一
颜料涂层组合物(X)涂覆待涂覆的物品; 步骤(2):用
水性第二
颜料涂层组合物(Y)涂覆待涂覆的物品; 步骤(3):用
水性第二
颜料涂层组合物(Y)涂覆待涂覆的物品:步骤 (4):加热未固化的第一
颜料涂膜、未固化的第二
颜料涂膜和未固化的透明涂膜,使其固化,其中
水性第一
颜料涂膜组合物 (X) 包含具有特定封端
异氰酸酯基团的封端多
异氰酸酯化合物。