Transparent protective coat for concrete

Abstract

The invention belongs to the technical field of anticorrosive materials and discloses a transparent protective coat for concrete. According to a three-layer matched scheme of a combined action principle of physical shielding and chemical sealing, the transparent protective coat for concrete comprises a base coat, a floating coat and a topcoat, wherein the base coat is alkyl alkoxy silane, the floating coat is a cationic acrylic polymer emulsion film-forming system; the topcoat is a water-based fluorocarbon resin and polyurethane associative thickener system with pH value of 8-9; the content of the water-based fluorocarbon resin is not less than 20%; the minimum film-forming temperature is not less than 27 DEG C. The transparent protective coat for the concrete has high permeability and excellent sealing property for the concrete, is simple and convenient to construct, transparent in coating and excellent in stain resistance, avoids water dampness and discoloration of the concrete, inhibits nonuniform absorption of the concrete, effectively prevents the concrete surface from blackening, keeps the natural surface effect of the concrete, and is suitable for the protection and application field of various reinforced concrete structures.

Description

technical field [0001] The invention belongs to the technical field of anti-corrosion materials, and relates to the technology of anti-corrosion materials, in particular to the technology of transparent anti-corrosion of concrete surfaces. Background technique [0002] There are two main ways in which concrete protective coatings work: physical and chemical. The physical method is to use the concrete protective coating itself to form a film to shield the corrosive medium from entering the interior of the concrete. The effectiveness of the concrete protective coating in this way is closely related to the properties of the formed film. The quality of the film will directly affect the durability of concrete. The other way is the chemical way, which means that the concrete protective agent penetrates into the concrete and undergoes complex physical and chemical changes with the cement hydration products in the cement stone pores to form new substances, which block the corrosion ...

AI Technical Summary

Problems solved by technology

The silicone polymer used in the primer of the coating has relatively insufficient permeability and sealability to the concrete substrate. The top coat is simply a mixture of fluorosilicone resin and water, which has poor workability and is difficult to adapt to the construction and decoration requirements of different applications.

Chinese patent CN101318832A discloses a concrete surface protection material and its preparation method. The film-forming material adopts polyaspartic acid ester polyurea, which overcomes the poor mechanical properties of concrete and withstands temperature changes, alternating dry and wet cycles, and freeze-thaw cycles. Poor ability, easy to be damaged and other shortcomings, but the film-forming material has fast curing reaction and difficult construction. At the same time, the weather resistance is not strong, easy to yellow, and cannot meet the long-life use requirements of concrete structures.