When the content of the substrate pigment is high, the thixotropy is obvious, the fluidity is poor, and the film is easy to protruding. However, if PVP and other leveling agents are added to the styrene acrylic emulsion, a coating with high pigment content (non-volatile content of more than 70%), high viscosity, good leveling and smooth film can be obtained, and a smooth coating can be obtained by pressing, and the paint amount is less, the luster is good, and the pollution resistance.
In recent years, the use of microencapsulation technology can further improve the dispersion stability of pigments, improve the covering ability and anti-fouling properties of coatings. In this paper, vinylpyrrolidone was polymerized in a suspension system composed of pigment and water, the solid particles were dispersed at the same time, and then vinyl acetate monomer and butyl acrylate were introduced to polymerize on the surface of solid particles to form a film, and finally a stable coating dispersion was obtained. The coating obtained by this coating can prevent food contamination.