Formulation for Efficient Matting in 100 UV-curable Coatings

摘要

A low gloss or matt effect is frequently a key feature or requirement of many coating materials applied to the surfaces of man-made objects or constructions. In traditional low to medium solids, solvent- and water-borne coatings film shrinkage resulting from the evaporation of volatile components and crosslinking or polymerisation reactions of the binder materials, together with a sufficient number of matting agent particles of a suitable size, enable the formation of a micro-rough film surface structure. This structure is necessary for the diffuse light-scattering responsible for creating the visual effect of reduced gloss (figure 1). Specially designed matting agents are available, to provide the "particles" required. Above all the micronised porous synthetic silica products, with their high purity, low particle density and well-defined particle size distribution represent ideal materials for this purpose.