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Grinding medium
Anchoring of the polymeric dispersant
to the pigment surface can be affected by competition between the resin
and dispersant for the surface of the particle. Once the anchor group
of the dispersant is attached to the pigment surface it will remain firmly
attached. Molecules of resin, however, are transiently adsorbed on the
surface of the pigment, and even though not firmly anchored they can hinder
the dispersant anchoring process.
Minimal-resin solids (or resin-free systems) can be used
in the dispersion, as long as good let-down stability is sufficiently
available. Dispersant technology is now more advanced, and in some systems
dispersing without resin is possible.
As an example SOLSPERSE 43000 polymeric dispersant would
be recommended for dispersing various pigments in resin-free dispersions
for general industrial and decorative water-based paints. A key benefit
of using this kind of product is the wide resin compatibility it offers
in various resin systems, including polyester, acrylic, polyurethane,
alkyd and epoxy.
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To select the most suitable dispersing agents for your coating
system, contact our experts via TechDirect |
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