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Paint

Other Names: Many names are used to describe various types of paints or liquids used in various stages of the making of paints, e.g., primer, abrasive paint, hot bituminous paint, latex paint, water soluble, non-abrasive, Flocoat, paint paste, paint base, alkyd base, epoxy paint, acrylic paint, etc., etc.

Paint is a liquid mixture which can be applied to surfaces to form a dry, thin, protective or decorative film. Paint is composed of a solid (pigment) and a liquid vehicle. The vehicle consists of a binder which forms a film and usually a volatile solvent to improve the ease of application. Paints may be either water-base or oil-base. Oil-base paints have as the thinner organic liquids such as turpentine, naphtha, benzene, acetone or an alcohol.

Some paint binders form film by oxidation or polymerization. Examples of these are drying oils and phenolic or melamine resins. Other binders form films by evaporation of the thinner. Still other binders form a film when particles coagulate from a latex or dispersion of synthetic rubbers.

Paints also contain small amounts of plasticizers, driers, extenders, emulsifiers, stabilizers, etc.

Viscosity: Varies from 20 cPs. to 5,500 cPs. normally, with some of the paste-like materials going much higher

Remarks: Paints are used, in addition to the normally accepted applications of protective and decorative coatings, for such things as imparting resistance to corrosion, fire or mildew and fungus growth, providing electrical insulation, reduction of frictional resistance, etc.

Pumps are used for handling paints and their constituents at all stages of production. Pumps are used in feeding liquid to and taking it from sand grinders in preparation of the pigments, in the mixing and blending of the various paints when they are being compounded, for circulating, transferring and delivering directly to the point of application, such as a spray head or a striper.

Some paints are shear sensitive; the latex and emulsion type should be handled cautiously, particularly if they are recirculated. Many pumping systems are flushed when colors are changed or at the end of a run, so provision should be made for handling a thin solvent as well as for the paint itself.

Pump Notes: Cast iron construction is usually satisfactory but stainless steel may be required depending on the paint handled. Elastomer recommendations depend on the solvent used. Many paints or paint constituents are abrasive and must be handled with a pump designed to handle abrasives.

See also:  Paint