Aminosilane-modified pigments for spectrally selective paints, methodfor their preparation and application in paints

摘要

This invention relates to aminosilane-modified pigments, to a method for their preparation, to paints made of these pigments and to their production and application. More precisely, the invention relates to the procedure for application of aminosilanes for treatment of various black and coloured pigments with emphasis on changes of pigment surface properties, to procedures for preparation of appropriate dispersions and to their processing into colours and paints which exhibit a higher hiding power, which in turn enables the production of black or coloured thickness-sensitive spectrally-selective (TSSS) as well as thickness-insensitive spectrally- selective (TISS) paints, the procedures including methods of their preparation and application on metallic and non-metallic substrates. The procedure for the functionalization of inorganic pigments with aminosilanes for application in spectrally selective paints is characterized by dispersing the pigment in the solution of aminosilane in a solvent or a mixture of a solvent and a binder without addition of non-aminosilane dispersants, with or without milling, by using 0.05 to 30% (m/m) aminosilane on the pigment and/or by using aliphatic, cycloaliphatic, aromatic and heteroaromatic compounds, alcohols, ethers, esters or mixtures of these compounds as solvents and/or by using silicone-polyester, polyurethane and fluoropolymeric binders, where the procedure described is carried out either in situ, when preparing a paint/a pigment paste, or by isolation of the aminosilane-functionalized pigment.