Method of making paint composition for concrete and masonry surfaces

摘要

The present invention is directed to a water-based paint composition for concrete and masonry surfaces, a method of coating a concrete or masonry surface, and a corresponding method of preparing a coated concrete or masonry surface. The paint composition includes about 10-50% by weight water, about 5-40% by weight colloidal silica particles, about 40-85% by weight of an inorganic pigment, and about 1-10% by weight of a polymer binder. The paint composition provides the coated surfaces with excellent resistance to a wide variety of weather conditions, and alleviates health and safety concerns associated with long-term exposure to conventional organic-based paints.

主权项

1. A method of making an environmentally safe paint composition for coating concrete and masonry surfaces, comprising the steps of:
providing an aqueous colloidal silica suspension consisting essentially of colloidal silica particles and water; and mixing the aqueous colloidal silica suspension with sufficient amounts of an inorganic pigment, a polymer binder, an anti-fungal ingredient and water to form a paint composition comprising about 10-50% by weight water, about 5-40% by weight colloidal silica particles, about 40-85% by weight of the inorganic pigment, about 1 to 9% by weight of the polymer binder and about 0.1-5% by weight of the anti-fungal ingredient, based on the weight of the paint composition; wherein the polymer binder is selected from the group consisting of polymers and copolymers of acrylic, acrylamide, vinyl ethers, vinyl esters, urethanes, methacrylates and epoxy esters, and a sum total of organic components does not exceed 9% by weight, inclusive of the polymer binder, and the paint composition is substantially free of Group I and Group II metal oxides.