How to solve the problem of color drift when the pigment paste is added to the paint?

1. The surface tension difference between pigment paste and coating is too large. Coatings generally use anionic or ionic polyelectrolyte dispersants, while color pastes generally use nonionic or some anionic dispersants to make white pigments and colored pigments. The surface adsorbs different wetting and dispersing agents with different surface tensions.

2. Poor compatibility of color paste and paint The emulsifier outside the emulsion particles is not compatible with the surfactant outside the pigment and filler particles, resulting in the flocculation of the pigment.

3. The hydrophilic and lipophilic balance between the pigment paste and the coating does not match. The surface tension of the lipophilic end of the lipophilic substance is small, and it is easier to float to the surface.

4. The influence of thickeners Some pseudoplastic associative thickeners have a great affinity with surfactants with larger HLB values, causing them to desorb on the surface of the pigments, causing aggregation and flocculation of the pigments, resulting in floating color hair. flower. Solution: Selecting appropriate wetting and dispersing agent, adjusting particle surface properties and adjusting its movement balance is the best way to control floating color. No matter what the cause of colored pigment flocculation, whitening, pigment flocculation and floating color, wetting and dispersing agent can be used to deflocculate, improve the surface properties of particles to prevent or control floating color. Mutual transformation, control floating color. If it is the color of the color paste that floats, it means that the HLB value of the coating is relatively large and relatively hydrophilic. During the preparation of the base paint, adding lipophilic and low-property additives will reduce the HLB value of the coating. If the floating color is white, it means that The HLB value of the coating is relatively small, and it is relatively lipophilic. In the preparation process of the base paint, hydrophilic additives are added to increase the hydrophilicity of the coating.