This invention relates to a hardener composition H for an aqueous epoxy resin based two-pack coating formulation wherein the hardener composition H comprises reaction products of at least difunctional epoxides H1, at least difunctional hydroxypoly-oxyalkylenes H2, at least difunctional hydroxyaromatic compounds H3, unsaturated fatty acids H42 having a carboxyl functionality of more one which comprise the so-called dimer fatty acids, secondary amines H5 having additional carbonylimine-blocked primary amino groups, obtained by reaction of amines H51 having at least one primary amino group and at least one secondary amino group with carbonyl compounds H52 which have an aldehyde or ketone carbonyl group, optionally, hydroxy-functional secondary amines H6 having at least one secondary amino group and at least one hydroxyl group, and further optionally, amines H7 having at least one primary, and at least one tertiary amino group, wherein the unsaturated fatty acids H42 are incorporated into the hardener in the form of beta-hydroxy esters. It also relates to a process for the preparation of the hardener H, to aqueous two-pack coating compositions with an epoxy resin E, and to the use of these coating compositions as first or primer layer to prepare multilayer coatings together with solvent-borne coating compositions for the upper layer.
本发明涉及一种用于基于环氧
树脂的
水性双组分涂料配方的固化剂组合物 H,其中固化剂组合物 H 包括至少双官能团
环氧化物 H1、至少双官能团羟基聚氧烷基 H2、至少双官能团羟基芳香族化合物 H3、具有一个以上羧基官能团(包括所谓的二聚
脂肪酸)的不饱和
脂肪酸 H42、具有额外的亚羰基伯
氨基的仲胺 H5 的反应产物、由具有至少一个伯
氨基和至少一个仲
氨基的胺 H51 与具有醛或酮羰基的羰基化合物 H52、可选的具有至少一个仲
氨基和至少一个羟基的羟基官能团仲胺 H6、以及可选的具有至少一个伯
氨基和至少一个叔
氨基的胺 H7 反应而得,其中不饱和
脂肪酸 H42 以β-羟基酯的形式掺入固化剂中。本发明还涉及固化剂 H 的制备工艺、含有环氧
树脂 E 的
水性双组分涂料组合物,以及将这些涂料组合物用作第一层或底层,与用于上层的溶剂型涂料组合物一起制备多层涂料。