The Effect of Co-solvents on Pigment Dispersion in Water-borne Paints

摘要

The effect of co-solvents on pigment dispersion in water-borne paints was evaluated. We considered that the co-solvents interfered with the stabilization by adsorption of grinding resin on the pigment, especially their hydrophobic interaction. First, we found the organic solvents used in the ordinary water-borne paints decreased the pigment dispersibility. We adopted the interfacial tension (γhsw) between water and hexane under the existence of the concerned solvent as a parameter which exhibits the degree of the interference. It was elucidated that dispersion stability was poorer when the solvent with the higher γhsw value was used.