Visible-light response self-cleaning coating and preparation method thereof

Abstract

The invention discloses a visible-light response self-cleaning coating and a preparation method thereof. The self-cleaning coating comprises the following components in percentage by mass: 5-10.5% of titanium dioxide doped with metal ions and added with a dispersing agent, 0.5-1% of polysiloxane and the balance of solvent and impurities, wherein the metal ions are one of W<6+> and V<4+> or a mixture of the two; the dispersing agent is PEG (polyethylene glycol). The preparation method comprises the following steps: A) preparing a titanium dioxide sol doped with metal ions and added with the dispersing agent; B) preparing polysiloxane; C) preparing the self-cleaning coating: mixing the titanium dioxide sol doped with metal ions and added with the dispersing agent with the polysiloxane sol at a proportion of (9-19):1 to obtain the visible-light response self-cleaning coating. The self-cleaning coating disclosed by the invention can respond to catalysis at the visible light band, and is convenient to coat without influencing the light transmission of glass; the preparation method has the characteristics of simple process, low production cost and the like.

Description

technical field [0001] The invention relates to a self-cleaning coating and a manufacturing method thereof, more specifically a visible light-responsive self-cleaning coating and a manufacturing method thereof, belonging to the technical field of functional materials. Background technique [0002] With the increasing development of the construction industry, more and more places use glass and ceramic tiles as decoration, and the cleaning method of glass and ceramic tiles has always been mainly manual cleaning, which is not safe and costly. In order to solve the above problems, many researchers have turned their attention to self-cleaning coatings. Self-cleaning coatings are applied to the surface of glass and ceramic tiles, and the cleaning effect can be achieved by washing with rainwater. Titanium dioxide in self-cleaning coatings is an ideal photocatalyst and hydrophilic agent. On the one hand, the photocatalysis of titanium dioxide semiconductor particles can be used to d...

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Problems solved by technology

Therefore, the coating must be exposed to sunlight, more precisely, it must be exposed to ultraviolet light in sunlight to be effective, so the self-cleaning effect of titanium dioxide self-cleaning coatings on exterior glass at night, on cloudy days or on backlit surfaces is not good. it is good;

[0005] The second is that the coating process of the coating is complicated. At present, the methods for applying self-cleaning coatings to the glass surface mainly include chemical vapor deposition, sol-pulling + high-temperature sintering, and high-pressure spray guns;

[0006] The third is to affect the light transmittance of the glass. After the self-cleaning paint is applied to the surface of the light-transmitting glass, the light transmittance of the glass becomes worse. According to tests, some cleaning paints reduce the light transmittance of the glass by 15%-20%.

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