Production of decorative and functional surface coatings comprise initial irradiation of paint and lacquer layers with a monochromatic short wavelength UV light

摘要

A process for the production of decorational functional surface coatings comprises initial irradiation of paint and lacquer layers of acrylate, epoxide, vinyl ether, and/or styrene with a monochromatic short wavelength UV light. A process for the production of decorative and functional surfaces by electron beam or UV curing paint and lacquer layers of acrylate, epoxide, vinyl ether, and/or styrene or other radiation curable components on rigid or flexible substrates comprises application of monochromatic short wave UV light to form polymer radicals at the surface and in near surface layers from the monomeric and/or oligomeric system that comprises the wet coating layer. The total thickness of the wet layer is significantly greater than the penetration depth of the UV radiation. The resulting polymerization and cross-linking leads to the formation of micro-imperfections by shrinkage whereby by choice of the monomer/oligomer system, layer thickness, UV wavelength, substrate, pigmentation and coating technique the degree of imperfection may be varied. The layer is fully hardened provided that photoinitiator is present in the system or by means of electron beam irradiation. The formation of micro-imperfections of the required technical properties are controlled by means of the choice of processing parameters such as UV wavelength dosage/transport properties of the lacquer layer, oxygen concentration in the irradiation zone, coating thickness, viscosity, substrate, pigmentation, additives and coating technique and is reproducible by replication of defined parameters.