摘要:
The present invention relates to an aqueous clearcoat material for producing a waterborne urethane-based two-coat coating system, which comprises at least one secondary polyacrylate dispersion having a polyacrylate glass transition temperature Tg≧20° C. and at least one hybrid polyacrylate-polyurethane dispersion with a weight ratio of the polyacrylate fraction of the secondary dispersion to the polyacrylate-polyurethane fraction of the hybrid dispersion of 1:1 to 4:1, preferably 2:1 to 3:1, more preferably 2.25:1 to 2.75:1, and as curing agent at least one low-viscosity aminosulfonic polyisocyanate and an aqueous basecoat material for producing a waterborne two-coat coating system which comprises at least one polyurethane dispersion, at least one hybrid polyacrylate-polyurethane dispersion, and at least one melamine resin. The present invention additionally relates to a waterborne two-coat coating system comprising the aqueous clearcoat material and the aqueous basecoat material, to a process for producing it, to its use to coat a substrate, and to substrates coated with it.
摘要:
Disclosed is an aqueous clearcoat material for producing a waterborne urethane-based two-coat coating system, comprising at least one secondary polyacrylate dispersion having a polyacrylate glass transition temperature Tg≧20° C. and at least one hybrid polyacrylate-polyurethane dispersion with a weight ratio of the polyacrylate fraction of the secondary dispersion to the polyacrylate-polyurethane fraction of the hybrid dispersion of 1:1 to 4:1, and as curing agent at least one low-viscosity aminosulfonic polyisocyanate and an aqueous basecoat material for producing a waterborne two-coat coating system comprising at least one polyurethane dispersion, at least one hybrid polyacrylate-polyurethane dispersion, and at least one melamine resin. Also disclosed are a waterborne two-coat coating system comprising the clearcoat material and the basecoat material, a process for producing it, its use to coat a substrate, and substrates coated with it.
摘要:
The use of aqueous, physically curable, pseudoplastic or thixotropic, polyurethane-based coating materials as adhesion primers for coatings, and a process for coating uncoated plastics surfaces and old coatings by applying at least one coating material to the uncoated plastics surfaces or the old coatings and curing the resulting coating film(s), which comprises applying an aqueous, physically curable, pseudoplastic or thixotropic, polyurethane-based adhesion primer to the uncoated plastics surfaces or the old coatings and overcoating it with at least one further coating material.