Abstract
This paper presents a study that underlines the importance of the choice of polymer dispersions in the composition of an exterior emulsion paint in order to improve its quality with respect to the action of external factors. All these properties which facilitate the application and increase the durability are due to the homogeneous distribution of inorganic particles in an organic binder. In order to emphasize this influence, various types of polymer latexes were used: a dispersion of an acrylic copolymer and methacrylic ester, but also combinations thereof with a potassium silicate solution, with silicone latex, with a colloidal suspension containing an alkyd resin with 70% solids dissolved in White Spirit, by comparison with a dispersion of nano silica particles in an organic polymer. All these types of paints which were obtained were analyzed by measuring their hardness, contact angle, elasticity, dirt pickup and chalking resistance, color retention during accelerated (artificial) aging, water vapor diffusion and water permeability, thus proving the existence and efficiency of the inorganic particles of the paint composition. Keywords: acrylic dispersion, silicone paints, -acrylic-silicon, solvent based alkyd resins, accelerated aging resistance