A self-cleaning organic-inorganic hybrid composite coating and its preparation method and application

Abstract

The invention discloses a self-cleaning organic-inorganic hybrid composite coating, a preparation method and application thereof. The composite coating comprises the following components in parts by weight: 100 parts of inorganic silicate solution, 20 to 30 parts of silicon titanium sol, 10 to 60 parts of water, 10 to 80 parts of filler, 0 to 30 parts of colorant, and 0.5 parts of dispersant ~2 parts, 0.1~1 part of defoaming agent, 0.1~1 part of thickener; the present invention obtains organic-inorganic hybrid silicon-titanium sol through self-made silicon-acrylic emulsion with high silicon content through ternary system hybridization reaction, adding The organic-inorganic hybrid composite coating is obtained after the inorganic silicate coating system. The composite coating not only greatly improves the toughness of the coating, but also effectively prevents problems such as cracking, powder falling, and even falling off of the coating; it also reduces the surface energy of the coating. , improve the surface contact angle of the coating material; make the organic matter adsorbed on the surface of the wall coating decompose under the action of photocatalysis, achieve the self-cleaning effect, and improve the decoration and beautification of the coating.

Description

technical field [0001] The invention relates to the technical field of building interior and exterior wall coatings, in particular to a self-cleaning organic-inorganic hybrid composite coating and its preparation method and application. Background technique [0002] At present, economic development and people's lives attach great importance to low-carbon, energy-saving, environmental protection, and fire prevention. Therefore, the inorganicization of architectural coatings conforms to market demand; and most of the commercially available inorganic coatings use inorganic silicates as film-forming substances, silicon Salt is rich in raw materials, economical, strong film-forming ability, hard and wear-resistant, aging-resistant, durable and non-fading, good mildew resistance, good flame retardancy, and meets the requirements of contemporary architectural coatings for energy saving and environmental protection. However, inorganic silicate interior and exterior wall coatings wit...

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Problems solved by technology

However, inorganic silicate interior and exterior wall coatings with inorganic silicate as the main film-forming substance also have technical weaknesses such as brittleness, easy cracking, and powdering after long-term use; and after the inorganic silicate coating is formed into a film, Part of it penetrates into the substrate, leaving a lot of capillary pores during the film forming process, making the mineral coating film breathable, but its breathability is both an advantage and a disadvantage, especially for exterior wall coatings, which are exposed to the wind and sun over time. Under normal circumstances, dust and other particles will be adsorbed and accumulated in the capillary pores of the coating, and the dust will make the coating dirty, thus weakening the decorative and beautifying effect of the coating on the wall.

Patent CN108084751A discloses a fluorine-containing titanium sol, inorganic silicate coating and its preparation method. The surface contact angle can reach 110°-145°. Ideal; and in terms of performance, inorganic silicates are mainly used as film-forming substances, and the toughness of the coating film still needs to be further improved; in actual production and use, the market competition is fierce, and the price of fluorine-containing monomers is expensive, so the cost of fluorine-titanium sol is relatively high. higher

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