To achieve optimal pigment dispersion in coatings, multiple additives are often necessary. Two such additives are wetting agents and dispersants. But what's the difference between wetting agents and dispersants? The following should help explain.
What do Wetting Agents do?
- Used to help spread liquid over a solid surface
- Lowers the surface tension of a liquid
- Hydrophilic head and a hydrophobic tail
What do Dispersants do?
- Distributes dry pigments without flocculation
- Homogenous suspension homogeneously
- Absorbs onto the pigment surface
- Incorporates electrostatic repulsion and/or steric hindrance
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