A kind of photocatalytic exterior wall latex paint and preparation method thereof

Abstract

The invention relates to a photocatalytic exterior wall latex paint with the following mass percentages of components: 0.2-0.8% wetting agent, 1-4% dispersant, 0.3-0.8% water-soluble thickener, and 0.1-0.3% pH regulator , defoamer 0.5‑1%, titanium dioxide 10‑15%, kaolin 8‑12%, talcum powder 10‑15%, calcium carbonate 6‑10%, photocatalyst 3‑8%, silica sol 10‑15%. Membrane aid 1.2-2.2%, emulsion 20-35%, bactericide 0.1-0.3%, hydrophobic thickener 0.1-0.3%, the balance is deionized water, the sum of the mass percentages of the above components is 100 %. In the present invention, carbon-doped titanium dioxide coated with graphene oxide is selected as the photocatalyst, so that the cured paint film has a strong adsorption efficiency for the small molecules of the precursors of the secondary particles in the air, and is absorbed before the secondary aerosol is formed. The paint film is adsorbed and oxidized into a stable ion form, which is dissolved and washed by water on the surface of the paint film; the photocatalyst can micronize the cured paint film, exposing the new photocatalytic layer inside the paint film to maintain its long-term use Under the sustainable photocatalytic activity, prolong the service life.

Description

Technical field[0001]The invention relates to the technical field of coatings, in particular to a photocatalytic exterior wall latex paint and a preparation method thereof, in particular to a photocatalytic exterior wall latex paint that can inhibit the generation of haze, and can be used for air purification of buildings.Background technique[0002]Smog is a type of air pollutant that is extremely harmful, which has a serious impact and damage to the human respiratory system and the natural environment. According to the formation process, haze can be roughly divided into two categories: primary particulate matter and secondary particulate matter. Primary particulate matter is the particulate matter that is directly emitted during certain physical and chemical processes (such as dust and combustion). The formation of particulate matter and its physical occurrence in the atmosphere Or it has nothing to do with chemistry; secondary particles are particles formed by heterogeneous reactio...

AI Technical Summary

Problems solved by technology

[0005] However, to realize the effective suppression of secondary particles by photocatalytic materials, there are the following main problems and challenges: First, due to the insufficient adsorption and photocatalytic ability of gaseous small molecules of photocatalytic materials, the purification rate of small molecule precursors is slower than its nucleation Second, after the surface of the photocatalytic material absorbs pollutants, the photocatalytic activity decreases, and it is difficult to maintain a long-term photocatalytic active surface after the surface is polluted.

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