Wäßrige Beschichtungsmittel auf Epoxid/Amin-Basis und ihre Verwendung bei Mehrschichtlackierungen

摘要

Aqueous coating agents containing A) one amine constituent made of aminourethanes A1) that are obtained by reacting compounds consisting of at least one cyclic carbonate group with amines consisting of at least one primary amino group, whereby the ratio of the number of cyclic carbonate groups to the number of primary amino groups ranges from 1:10 to 1:11, and which can be reacted with hydrophilic water-dilutable epoxide compounds A2), whereby the ratio of the number of amine hydrogen atoms of A1) to the epoxide groups of A2) ranges from 2:1 to 20:1 and B) an epoxide constituent consisting of epoxide compounds that contain urethane groups and which can be obtained by reacting one or several epoxide compounds c) with polyisocyanates d), whereby the amount of polyisocyanates used ranges from 0.1-50 wt. % in relation to the amount of the epoxide constituent.