Wäßrige Bindemitteldispersion für kationische Elektrotauchlacke

摘要

The present invention relates to an aqueous binding agent dispersion for cathodically precipitable electro-dipcoat paint based on modified epoxide resins containing ammonium groups, obtainable by A) reaction of I) a precursor which can preferably be produced at temperatures of 120 to 180 DEG C, and even more preferably between 125 and 150 DEG C, from a) a diepoxide compound or a mixture of diepoxide compounds and b) an aromatic or aliphatic compound, preferably containing hydroxyl, carboxyl, phenyl and/or thiol groups or a mixture of such compounds by reacting the phenolic hydroxyl groups with epoxide groups, II) with at least one organic amine or a mixture of organic amines at reduced addition temperatures of 60 to 130 DEG C, preferably between 90 and 115 DEG C, to obtain an epoxide amine adduct, B) by subsequent or simultaneous reaction of the secondary hydroxyl groups with epoxide groups of the epoxide amine adduct obtained in step A) at a temperature of 110 to 150 DEG C, preferably at 130 DEG C with optional addition of a catalyzer, C) by adding a preferably solvent-free cross-linking agent or a mixture of various cross-linking agents at a temperature of 150 DEG C, preferably at 90 to 130 DEG C, D) optionally by neutralizing preferably by adding acids at temperatures of 90 to 110 DEG C, E) by dispersing the mixture obtained in steps A to D using water. The invention further relates to a method for the production and use of said dispersion.