Nano-silica sol-modified outer wall paint and preparation method thereof

Abstract

The invention discloses nano-silica sol-modified outer wall paint and a preparation method thereof. The nano-silica sol-modified outer wall paint comprises, by weight, 10-25% of nano-silica sol, 0.1-0.2% of a coupling agent, 0.2-2.0% of a neutralizer, 10-30% of an acrylic emulsion or a styrene-acrylic emulsion, 10-15% of a pigment, 10-20% of a filler, 0.2-0.4% of a dispersant, 0.2-0.4% of a wetting agent, 0.3-2.0% of a thickening agent, 0.2-0.4% of an antifoaming agent, 0.4-0.6% of a mildew-resistant antiseptic, 0.6-1.4% of an antifreezing agent, 0.4-1.2% of a film forming assistant and 20-30% of deionized water. The invention also provides the preparation method of the nano-silica sol-modified outer wall paint. The nano-silica sol-modified outer wall paint has good storage stability and can form a paint film which does not effloresce and fall off easily, has good permeability, does not mildew easily, and has excellent water resistance and alkali resistance.

Description

technical field [0001] The invention relates to an exterior wall paint and a preparation method thereof, in particular to a nano-silica sol modified exterior wall paint and a preparation method thereof. Background technique [0002] Water-based coatings for building exterior walls can not only ensure non-toxic and harmless coating construction and use, but also have the advantages of convenient construction, and are generally valued by the coating industry. At present, most of the exterior walls of urban buildings are covered with glass curtain walls or ceramic tiles, which not only brings light pollution, but also increases the weight of buildings, posing safety hazards. Traditional exterior wall coatings are mostly water-based organic latex coatings, which generally have defects such as poor suspension stability, aging resistance, poor scrub resistance, poor finish, and poor stain resistance. The coating will blister and bleed after a short period of time. , discoloration...

AI Technical Summary

Problems solved by technology

At present, most of the exterior walls of urban buildings are covered with glass curtain walls or ceramic tiles, which not only brings light pollution, but also increases the weight of buildings, posing safety hazards

Traditional exterior wall coatings are mostly water-based organic latex coatings, which generally have defects such as poor suspension stability, aging resistance, poor scrub resistance, poor finish, and poor stain resistance. The coating will blister and bleed after a short period of time. , discoloration, shedding and other phenomena, often two or three years after the building is completed, its exterior wall paint will be covered with dust and rainwater flow marks or the coating will be powdered and faded or even fall off in a large area, which seriously affects the appearance of the building and also affects the appearance of the building. The landscape of the community and the city limits the widespread application of exterior wall coatings

[0003] CN102732079A disclosed on October 17, 2012 an exterior wall paint prepared by mixing water glass (aqueous solution of sodium silicate or potassium silicate) and emulsion. The pH value is high (pH value is about 14), and the compatibility with the pigments and fillers in the paint is poor. Although the viscosity stabilizer is added, the storage stability of the paint is still difficult to guarantee

[0004] CN102618136A disclosed an exterior wall paint prepared by mixing organosilane and acrylic emulsion on August 1, 2012. The exterior wall paint has improved hydrophobicity, air permeability and initial water discoloration resistance, but the coating film is not resistant to mildew, and Organosilanes drive up costs

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