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Industries > Antifoam Solutions > Paint & Coating

Paint & Coating

In water-based emulsion paints, stabilization of foam derives mainly from the surfactants and polymeric stabilizers used during the manufacture of the paint. Thus, high-foaming anionic surfactants are used in the preparation of emulsion polymers from which synthetic water-based emulsion paints are made. Industrial paints, on the other hand, often use water/co-solvent mixtures so that the polymeric binder is rendered soluble. This combination of ingredients can yield relatively stable foam irrespective of the presence of surfactant contaminants.

Antifoams consisting of mixtures of hydrophobic silica and polydimethylsiloxanes were once considered to satisfy this criterion.

Air can be incorporated into a coating:

  • By mixing during the polymer/pigment grinding and let-down steps,
  • By pumping during package filling or
  • By shear or spraying during application

Silicone-based antifoams have progressed markedly since the first use of PDMS fluids in solvent-borne coatings and inks. Keeping pace with formulation changes and environmental drivers, silicone antifoams have evolved to comprise a variety of delivery systems and polymer types to meet the specific requirements of diverse formulations.

For waterborne coatings and inks, the product offerings have been expanded to include novel silicone polyether-based antifoams that offer effective foam control balanced against ease of incorporation and well-coated surface appearance in several coating and ink systems.