Definition and Type of Wetting Dispersant Agent

Pigment is one of the main material in coating. Pigments need to be distributed in coating in order to achieve a bright, clean and attractive color. In order to do that, these pigments have to been stabilizing in small particles when the paint is in the can for long term.

Wetting dispersing agent has function to replace air and wetting the solid particle surface, disperse the agglomerate particles to it primary particle size, and then stabilized the solid particle in coating.

A good dispersing is needed to prevent flocculated pigment.

Flocculated pigment can cause many defect such as loss of gloss, loss of transparency to organic pigment, poor color stability, syneresis, flooding and floating, and reduce in tinting strength.

They are 2 types of wetting dispersing agent:

  • Conventional wetting and dispersing agent

Picture Courtesy of AFCONA

Conventional wetting and dispersing agent are low molecular weight material and usually used in inorganic pigment.

Conventional wetting and dispersing agent that has ionic structure mostly used in solvent base. While that has non-ionic structure mostly used in water-base system.

  • High molecular weight polymeric dispersant

Picture Courtesy of AFCONA

High molecular weight polymeric dispersant is high molecular weight dispersant that needed  to separate two pigment particles to a distance where it can reach the critical distance or where the attraction forces between them is near to zero.

This type of dispersant usually used with organic pigment.

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