Pigment paste is widely used in various interior and exterior wall architectural coatings (latex paint), water-based industrial coatings, water-based wood coatings, etc. The use of color paste in latex paint is a mixture of two dispersion systems. The pigment in the color paste is dispersed in water under the action of surfactant A. The performance and quantity of the surfactant determine the pigment content, degree of dispersion, and stability; Dispersed in water under the action of agent B, the nature and quantity of surfactant determine the average particle size, gloss and stability of latex paint. If the compatibility of the two dispersion systems is not good, the following problems will occur:
① If the type of dispersant used in the color paste does not match, the dispersant will react with each other and break the emulsion
②If the amount of dispersant used in the color paste is not enough, it will lead to poor stability of architectural coatings;
③ If the amount of dispersant used in the color paste is too large, it will make the coating film poor in water resistance and drying performance;
④ If the pigment agglomerates, it will result in a decrease in the coloring power of the paint, a change in hue, a decrease in hiding power, a decrease in gloss, poor fluidity, and poor leveling.