Paint & Coating
In water-based emulsion paint stabilization of foam derives mainly from the surfactants and polymeric stabilizers used in 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 employ water cosolvent 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 hyrophobed silica and polydimethylsiloxanes were once considered to satisfy this criterion.
Air can be incorporated into a coating:
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.