Wäßriges Zweikomponenten-Polyurethan-Beschichtungsmittel, Verfahren zu seiner Herstellung und seine Verwendung als Decklack oder Klarlack sowie seine Verwendung zur Beschichtung von Kunststoffen

摘要

The invention concerns an aqueous two-component polyurethane coating agent containing: (I) a component (I) which contains as binder: (A1) at least one water-soluble or water-dispersible polyester resin (A1) containing hydroxyl groups and acid groups which can be transformed into the corresponding acid anion groups, the polyester resin having an OH number of between 30 and 250 mgKOH/g and an acid number of between 5 and 150 mgKOH/g; (A2) at least one water-soluble or water-dispersible polyurethane resin (A2) containing hydroxyl groups and acid groups which can be transformed into the corresponding acid anion groups, the polyurethane resin having an OH number of between 20 and 200 mgKOH/g and an acid number of between 5 and 150 mgKOH/g; (A3) at least one water-soluble or water-dispersible acrylate copolymer, containing hydroxyl groups and acid groups which can be transformed into the corresponding acid anion groups, and/or an acrylated polyester and/or an acrylated polyurethane with an OH number of between 40 and 200 mgKOH/g and an acid number of between 5 and 150 mgKOH/g; and (A4) optionally at least one further polymer (A4); and (II) a component (II) which contains a polyisocyanate component (F1) as crosslinking agent. The invention is characterized in that the mixing ratio of the polyester resin (A1) to the polyurethane resin (A2), expressed as parts by weight, is between 95 : 5 and 5 : 95.