Polymer dispersants stabilize paint, coating, and ink systems through a steric hindrance stabilization mechanism. They must have special anchoring groups that can strongly adsorb onto the surface of particles, and must contain polymer segments that can provide steric hindrance stability for the required solvent or resin solution.

Surfactant dispersant

Surfactants are traditional low molecular weight dispersants. Surfactant molecules can reduce the surface tension between pigments and resin solutions. The generation of this surface activity is due to the surfactant structure comprising two different groups of soluble or polar functional groups.

In aqueous systems, polar groups are referred to as hydrophilic groups, while non-polar groups are referred to as hydrophobic or oleophilic groups. In non-aqueous systems, polar groups are referred to as oleophobic and non-polar groups are referred to as lipophilic.

The most widely used surfactants for pigment dispersion in paint formulations are:

● Fatty acid derivatives

● phosphate

● Sodium polyacrylate/polyacrylic acid

● acetylene glycol

● Soy lecithin

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