申请人:DeSOTO, INC.
公开号:EP0097777A1
公开(公告)日:1984-01-11
A pigmented, thermosetting organic solvent solution coating composition having improved capacity to resist acid rain is disclosed in which a resinous polyepoxide, a phenoplast resin cross-linking agent for said polyepoxide (preferably a xylolol-formaldehyde condensate), a phosphoric acid catalyst, a chromium-containing pigment providing resistance to corrosion, and a clay having the capacity to fix phosphate, are combined. For package stability, the catalyst is the reaction product of ortho phosphoric acid with an aliphatic diol, there being sufficient hydroxy in said diol to provide at least 1 equivalent of hydroxy for each acid equivalent in said phosphoric acid. These coatings are applied as a prime coating which is baked to remove solvents and provide a dry film without removing the phosphoric acid contained therein. The dry primer is then overcoated with a topcoat, and the doubly coated substrate is baked to cure the first coating.
本发明公开了一种颜料型热固性有机溶剂溶液涂料组合物,该组合物具有更强的抗酸雨能力,其中结合了树脂型聚环氧乙烷、用于所述聚环氧乙烷的酚醛树脂交联剂(最好是木酚-甲醛缩合物)、磷酸催化剂、具有抗腐蚀性的含铬颜料以及具有固定磷酸盐能力的粘土。为了保证包装的稳定性,催化剂是正磷酸与脂肪族二元醇的反应产物,二元醇中有足够的羟基,使磷酸中的每一个酸当量至少有 1 个羟基当量。这些涂料作为底层涂料使用,经过烘烤以去除溶剂并形成一层干燥的薄膜,但不会去除其中所含的磷酸。然后在干燥的底层上再涂一层面漆,并烘烤双重涂层的基底以固化第一层涂层。