A method of forming a multilayered coating on a substrate involves the steps of:
(I) applying to the surface of a substrate an aqueous based film forming composition comprising color pigments and an aqueous polyurethane dispersion comprising the reaction product of:
(a) a substantially branched, isocyanate containing prepolymer; and
(b) a polyamine having primary and/or secondary amino groups;
(II) applying a clear film forming composition over the basecoat of step (I);
(III) allowing the clear composition of step (II) to at least partially dry or cure to form a transparent topcoat over said basecoat.
在基底上形成多层涂层的方法包括以下步骤:
(I) 将
水基成膜组合物涂于基底表面,该组合物包含彩色
颜料和
水基聚
氨酯分散体,后者包含以下物质的反应产物
(a) 基本上是支化的、含有
异氰酸酯的预聚物;和
(b) 具有伯
氨基和/或仲
氨基的
多胺;
(II) 在步骤(I)的底涂层上涂覆透明成膜组合物;
(III) 使步骤(II)的透明组合物至少部分干燥或固化,以在所述底漆上形成透明面漆。