The function of the water-based paint dispersant is to disperse the pigments and fillers very finely and evenly in the paint to prevent the occurrence of sedimentation, agglomeration and flocculation. Especially in water-based systems, affected by the viscosity, the pigments and fillers are affected by their own gravity. , is prone to sedimentation, so it is necessary to add a dispersant to improve storage stability.

The specific functions of dispersants are as follows:

  1. The main function of the dispersant is to disperse the particles that need to be dispersed in the water-based paint on the surface so that they have better stability.
  2. The dispersant can improve the gloss of the water-based paint, improve the smoothness of the surface of the water-based paint, and maintain a certain level of stability. In this way, when sunlight hits the wall, the water-based paint will emit a good gloss.
  3. It can prevent the color of the water-based paint surface from changing. If the dispersant is not used properly, the color will change.
  4. The dispersant can also reduce the viscosity of the paint, so that more pigment can be added.
  5. Dispersants can also increase the stability of water-based coatings. If the strength of the dispersant is not good, the stability of the water-based coatings will be destroyed, which is not easily visible from the surface.
  6. Dispersants can also increase the color transparency and saturation of water-based paints, and enhance the hiding ability of water-based paints.

There are three main stabilizing mechanisms of dispersion:

1) DLVO diffusion double layer mechanism;

The charges or adsorbed ions on the surface of the pigment particles in the dispersion system produce a diffusion double electric layer. When the pigment particles approach, the double electric layer generates electrostatic repulsion to achieve stable dispersion of the particles.

2) Steric hindrance stabilization mechanism;
Uncharged polymer compounds are adsorbed on the surface of pigment particles to form a thick steric hindrance layer, thereby achieving a stable effect.
3) Electrostatic space stabilization mechanism;
The electrostatic steric hindrance mechanism is a combination of the above two mechanisms. Electrostatic repulsion and steric hindrance work simultaneously to form a stable dispersion system.