Use of an aqueous preparation for the coating of wood surfaces to achieve a natural-touch effect

摘要

The present invention relates to the use of an aqueous preparation for the coating of wood surfaces, characterized in that the aqueous preparation comprises: a hydroxyl-functional polyurethane-polyacrylate dispersion, apolyurethane dispersion, an at least partially hydrophilicized polyisocyanate and ≧0 weight-% to ≦10 weight-% of a matting agent, wherein the combined hydroxyl content of the hydroxyl-functional polyacrylate dispersion and the polyurethane dispersion is ≧1% to ≦12%. The invention further relates to a method of producing a coated wood surface, comprising the step of coating a wood surface with such an aqueous preparation and to a coated wood surface comprising an aqueous preparation whose use has been recited in the context of the use according to the invention.

主权项

1. A method for coating a wood surface, comprising applying an aqueous preparation to the wood surface; wherein the aqueous preparation comprises:
≧20 weight-% to ≦50 weight-% of a hydroxyl-functional polyurethane-polyacrylate dispersion, ≧20 weight-% to ≦50 weight-% of a polyurethane dispersion comprising a hydroxyl-functional polyurethane, ≧5 weight-% to ≦20 weight-% of an at least partially hydrophilicized polyisocyanate and ≧0 weight-% to ≦10 weight-% of a matting agent, wherein the combined hydroxyl content of the hydroxyl-functional polyurethane-polyacrylate dispersion and the polyurethane dispersion is ≧1% to ≦12%, and wherein the hydroxyl-functional polyurethane-polyacrylate dispersion is a polyurethane-polyacrylate hybrid secondary dispersion prepared by a process comprising: preparing a polyurethane solution (A) having an average molecular weight Mn of ≧1100 g/mol to ≦10000 g/mol, which contains no polymerizable double bond, in a non-aqueous solution, optionally in the presence of an vinylically unsaturated monomer which carries no group that is reactive towards an isocyanate group, adding to the polyurethane solution (A), one or more vinylically unsaturated monomers (B) at least one selected from the group consisting of (B1) acid-functional monomers, (B2) hydroxyl- and/or amino-functional monomers, and (B3) other monomers different from (B1) and (B2), to form a mixture, subjecting the mixture to free-radical polymerization in a homogeneous, non-aqueous phase to provide a hybrid polymer, neutralizing at least one neutralizable group, and dispersing the hybrid polymer into the aqueous phase, wherein the neutralization can take place before or after the vinyl polymerization or during the dispersing step.