Preparation method of transparent thermal insulation self-cleaning coating

Abstract

The invention relates to a preparation method of a transparent thermal insulation self-cleaning coating. The method comprises the following steps: (1) preparation of a photocatalyst: evenly mixing tetrabutyl titanate, ethyl orthosilicate and anhydrous ethanol, adding the mixture into a mixed solution containing inorganic acid, water and acetylacetone, stirring at 40-80 DEG C for 5-15 h, and cooling; (2) preparation of a thermal insulation powder dispersion liquid: adding a thermal insulation powder into a solvent A added with a dispersant and a defoamer to form a mixed solution, dispersing the mixed solution by stirring at high speed for 0.5-2 h, and then dispersing the mixed solution with ultrasonic for 15-40 min; and (3) preparation of a transparent thermal insulation self-cleaning coating: evenly mixing the photocatalyst, the thermal insulation powder dispersion liquid, a silicon resin, a leveling agent and a solvent B at room temperature. The preparation method has simple process, and is convenient for construction; the method provided by the invention can prepare a uniform and stable transparent thermal insulation self-cleaning coating, which has good thermal insulation performance, excellent cleaning performance, and good use effect.

Description

technical field [0001] The invention belongs to the technical field of glass coatings, and in particular relates to a preparation method of a transparent heat-insulating self-cleaning coating. Background technique [0002] Coating one or more functional coatings on glass substrates to achieve different properties is a widely used technology at present. For example, for large-area exterior wall glass of buildings, transparent glass roofs, automobile glass, etc., the thermal radiation of sunlight will increase the utilization rate of air conditioners and waste energy. One of the solutions is to coat the outer layer of glass with a layer of transparent Heat insulation coating, the transparent heat insulation coating can absorb and reflect infrared rays to limit the passage of heat energy, achieve excellent heat insulation performance, and maintain a high transmittance for visible light. In addition, because the organic pollutants of the atmosphere or indoor air will adhere to ...

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Problems solved by technology

In addition, because the organic pollutants of the atmosphere or indoor air will adhere to the glass surface, the glass needs to be cleaned frequently, and the cost of cleaning high-rise buildings is very high, and the cleaning agent will also pollute the ground, so people think of coating the glass with transparent heat insulation. After the paint, apply a layer of self-cleaning paint. At this time, it is often necessary to apply at least two layers of paint on the glass, and sometimes even paint on both sides of the glass to achieve the desired effect, which is cumbersome to operate and inconvenient to use.

[0003] At present, there are few methods for producing transparent heat-insulating self-cleaning coatings. The reason is that the preparation of self-cleaning coatings requires the use of photocatalysts. There are many materials that can be used as photocatalysts in the world, including titanium dioxide (TiO 2 ), zinc oxide (ZnO), tin oxide (SnO 2 ), zirconium dioxide (ZrO2), cadmium sulfide (CdS) and other oxide sulfide semiconductors, among which titanium dioxide (Titanium Dioxide) has become the most popular nano photocatalyst material in the world because of its strong oxidation ability, stable chemical properties and non-toxicity. , but due to the current commercial nano-TiO 2 Small particles, small specific gravity and nano TiO 2 The surface is extremely active, so that they are easy to aggregate together to form larger aggregates with several weakly connected interfaces, which greatly reduces or even eliminates the practical application effect of nanoparticles. At the same time, due to the nano-TiO 2 The surface is hydrophilic and oleophobic, and it is difficult to disperse evenly in the organic polymer resin. There will be voids on the interface. When the moisture in the air enters the voids, it will cause degradation and embrittlement of the polymer at the interface, resulting in a decrease in material performance. TiO in powder suspension 2 The system is difficult to ensure the uniform stability of the coating; in addition, adding photocatalyst nano-TiO 2 Particles can affect the clarity of the paint

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