coating system for furnierholz based on polyurethane dispersions, processes for its production and its use

摘要

A flexible and/or postformable coating system for veneered wood and further coating materials based on at least one polyurethane dispersion is described, which is obtainable by reacting a) 25 to 250 parts by weight of a polyol component (A), b) 50 to 250 parts by weight of a polyisocyanate component (B), c) 2 to 50 parts by weight of a polyamine component (C), d) 0 to 100 parts by weight of a solvent component (D), e) 50 to 1500 parts by weight of water to give a solvent-free or low-solvent polyurethane dispersion and then further processing this by adding f) if required, 0.5 to 50 parts by weight of a photoinitiator component (E) and g) 0.5 to 500 parts by weight of a formulation component (F) to give the end product. By using the coating system according to the invention and based on (radiation-curable) polyurethane dispersions, not only can the production of industrially coated shaped articles and finished products be significantly simplified but also a plaster effect is achieved in the postforming method by plastifying the veneer or coating material, which effect, depending on the formability of the veneer or coating material, permits small bending radii and dispenses with the need for steam treatment or moistening.