Preparation method and application of novel efficient light-touch transparent hybrid coating

Abstract

The invention discloses a preparation method and application of a novel efficient light-touch transparent hybrid coating, and belongs to the field of photocatalysis. The preparation method of the efficient light-touch transparent hybrid coating comprises the following steps: S1, respectively preparing a titanium peroxide complex solution and silicon dioxide sol; and S2, mixing the titanium peroxide complex solution with the silicon dioxide sol, and aging to obtain the titanium peroxide-silicon dioxide sol composite coating. According to the coating, the surface of a photovoltaic panel is coated with a titanium peroxide complex and silicon dioxide sol in a composite mode, the coating is cured through irradiation of ultraviolet rays, visible light or sunlight, the titanium peroxide complex in the coating generates titanium dioxide nano-particles on silicon dioxide particles in situ, and therefore the coating has excellent adhesive force and durability; therefore, the energy conversion efficiency of the photovoltaic panel is improved. Under simulated sunlight irradiation, the coating can realize efficient photocatalytic reaction and quickly decompose pollutants on the surface of the photovoltaic panel.

Description

Technical Field

[0001] The present application relates to a preparation method and application of a novel high-efficiency photosensitive transparent hybrid coating, belonging to the field of photocatalysis. Background Art

[0002] Photocatalytic technology has been widely applied in environmental protection and energy. Titanium dioxide, as an excellent photocatalyst, is widely used in wastewater treatment, air purification, and energy conversion. In recent years, titanium dioxide has also been incorporated into solar photovoltaic technology, serving as a coating or catalyst to enhance the energy conversion efficiency and pollution resistance of photovoltaic panels.

[0003] However, commercially available titanium dioxide coatings have problems such as poor stability and easy falling off in practical applications due to uneven dispersion of titanium dioxide particles in the coating and weak bonding with the substrate. Summary of the Invention

[0004] The present invention aims to provide a method for preparing a novel, highly efficient, photosensitive, transparent hybrid coating for use in solar photovoltaic panel coatings, thereby addressing the poor stability and flaking issues of conventional titanium dioxide coatings. By combining a titanium peroxide complex with silica sol, the present invention provides a coating with enhanced adhesion and durability. This coating, particularly when used in photovoltaic panel coatings, can improve the panels' energy conversion efficiency and pollution resistance.

[0005] According to a first aspect of the present application, a method for preparing a high-efficiency photosensitive transparent hybrid coating is provided.

[0006] A method for preparing a titanium peroxide-silicon dioxide sol composite coating with high efficiency and photocatalytic activity, comprising:

[0007] S1 prepares titanium peroxide complex solution and silica sol respectively;

[0008] S2: mixing the titanium peroxide complex solution and the silica sol, and aging them to obtain a titanium peroxide-silica sol composite coating.

[0009] Optionally, in step S2, the mass ratio of the silica sol to the titanium peroxide complex solution is 0.5 to 4:1.

[0010] Optionally, in step S2, the aging temperature is 80° C. to 100° C., and the aging time is 1 to 3 hours.

[0011] The titanium peroxide complex is obtained by hydrolyzing a titanium source with deionized water, adjusting the pH value of the hydrolyzate, and reacting the hydrolyzate with hydrogen peroxide.

[0012] Optionally, in step S1, the method for preparing the titanium peroxide complex solution includes:

[0013] A titanium source and water are mixed and hydrolyzed to obtain a hydrolyzate, and then the pH value of the hydrolyzate is adjusted to 7-12, separated to obtain a white solid, which is washed and redispersed in water, and a hydrogen peroxide solution is added and heated for reaction to obtain the titanium peroxide complex solution.

[0014] Optionally, the titanium source is selected from at least one of tetraethyl titanate, tetrabutyl titanate or tetraisopropyl titanate.

[0015] Optionally, the hydrolysis time is 0.5 h to 2 h.

[0016] Optionally, a sodium hydroxide solution is used to adjust the pH value of the hydrolyzate to 7-12.

[0017] Optionally, the volume ratio of the titanium source to the hydrogen peroxide solution is 1:10-30.

[0018] Optionally, the mass concentration of the hydrogen peroxide solution is 3-30%.

[0019] Optionally, the heating reaction temperature is 80° C. to 100° C., and the heating reaction time is 1 to 5 hours.

[0020] The silica sol is formed by dissolving a silicon source under the action of an acid or an alkali, and the pH value of the silica sol is adjusted to be in the range of 7 to 12.

[0021] Optionally, in step S1, the method for preparing the silica sol includes:

[0022] The silicon source is dissolved in water or an organic solvent, and an acid or a base is added to adjust the pH value to 7 to 12, and the reaction is carried out to obtain the silica sol.

[0023] Optionally, the silicon source is selected from at least one of methyl silicate, ethyl silicate, propyl silicate and butyl silicate;

[0024] The organic solvent is selected from at least one of methanol, ethanol, and isopropanol;

[0025] The acid is selected from at least one of hydrochloric acid and sulfuric acid;

[0026] The alkali is selected from at least one of sodium hydroxide, potassium hydroxide and ammonia water.

[0027] Optionally, the reaction temperature is 20 to 60° C., and the reaction time is 2 to 24 hours.

[0028] As a preferred embodiment, the preparation method comprises:

[0029] Step 1: Preparation of titanium peroxide complex

[0030] The titanium source and deionized water are mixed in an ice-water bath and hydrolyzed for 30 minutes to 2 hours. After the hydrolysis is completed, the pH value of the hydrolyzate is adjusted to 8-12 using a sodium hydroxide solution. The hydrolyzate is then centrifuged to obtain a white solid, which is then washed multiple times with deionized water and ethanol. The washed white solid is redispersed in an appropriate amount of deionized water, 30 wt% hydrogen peroxide solution is added, and the reaction is heated at a temperature of 80°C to 100°C for 1 to 5 hours. Finally, a transparent and clear orange-yellow liquid is obtained, which is a titanium peroxide complex solution.

[0031] Step 2: Preparation of silica sol

[0032] Dissolve a silicon source in water or an organic solvent, add an acid or base, and adjust the pH to 8-12 to promote the formation of silica sol. The reaction temperature ranges from room temperature to 60°C, and the reaction time ranges from 2 to 24 hours. The resulting product is a clear, colorless liquid, which is the silica sol.

[0033] Step 3: Preparation of titanium peroxide and silica sol composite coating

[0034] A titanium peroxide complex solution is added to the silica sol, and the aging is carried out at 80° C. to 100° C. for 1 to 3 hours to obtain a titanium peroxide and silica sol composite coating.

[0035] According to a second aspect of the present application, a coating with high-efficiency photocatalytic activity is provided. This coating utilizes a titanium peroxide-silica sol composite coating, which effectively improves the coating's stability, adhesion, and anti-pollution capabilities. After the titanium peroxide complex solution is compounded with the silica sol, the resulting titanium dioxide nanoparticles form strong chemical bonds with the silica surface through a curing process irradiated by ultraviolet light, visible light, or sunlight. This improves the stability and adhesion of the resulting coating, effectively preventing it from falling off during long-term use, and utilizing its high-efficiency photocatalytic activity to enhance the coating's self-cleaning properties and anti-pollution capabilities.

[0036] A highly efficient photocatalytically active coating is obtained by coating a titanium peroxide-silicon dioxide sol composite coating on a substrate surface and curing the coating;

[0037] The titanium peroxide-silicon dioxide sol composite coating is prepared by the above-mentioned preparation method.

[0038] Optionally, the coating method is selected from at least one of spraying, dipping or brushing. The thickness of the coating and the drying time can be adjusted according to actual needs to ensure the uniformity and stability of the coating.

[0039] Optionally, the curing step is performed under ultraviolet light, visible light, or sunlight for a period of 1 to 48 hours. Under ultraviolet light, visible light, or sunlight, the titanium peroxide complex can serve as a precursor to in-situ generate titanium dioxide nanoparticles on the silicon dioxide surface. This curing process enhances the titanium dioxide's adhesion to the substrate, improving the coating's stability and the photovoltaic panel's anti-pollution capabilities.

[0040] Optionally, the substrate is selected from one of glass and solar photovoltaic panels. The coating is applied to the surface of the solar photovoltaic panel to improve the energy conversion efficiency and anti-pollution ability of the photovoltaic panel.

[0041] The beneficial effects of this application include:

[0042] The preparation method and application of a novel, highly efficient, photosensitive, transparent hybrid coating provided herein utilizes a titanium peroxide complex and silica sol to form the coating. The coating is cured by ultraviolet light, visible light, or sunlight. The titanium peroxide complex in the coating generates titanium dioxide nanoparticles in situ on the silica particles, resulting in excellent adhesion and durability, thereby improving the energy conversion efficiency of photovoltaic panels. Under simulated sunlight, the coating can achieve a highly efficient photocatalytic reaction, rapidly decomposing pollutants on the surface of the photovoltaic panel.

[0043] The coating exhibits strong weather resistance under ultraviolet radiation, temperature changes and environmental influences, and can work stably for a long time. It is suitable for equipment such as solar photovoltaic panels that are exposed to the natural environment for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 (a) An electron microscope image and (b) an energy dispersive X-ray spectrometer of the coating of Example 1.

[0045] Figure 2 These are the wear resistance test diagrams of the coatings of Example 1 and Comparative Example 1.

[0046] Figure 3 The figures are acid resistance test diagrams of the coatings of Example 1 and Comparative Example 1.

[0047] Figure 4 These are the alkali resistance test diagrams of the coatings of Example 1 and Comparative Example 1.

[0048] Figure 5 These are the hot and cold cycle test diagrams of the coatings of Example 1 and Comparative Example 1.

[0049] Figure 6 The photocatalytic activity test diagram of the coating of Example 1 and Comparative Example 1. DETAILED DESCRIPTION

[0050] The present application is described in detail below with reference to embodiments, but the present application is not limited to these embodiments.

[0051] Unless otherwise specified, the raw materials in the examples of this application were purchased through commercial channels.

[0052] Unless otherwise specified, conventional methods were used for testing, and instrument settings were those recommended by the manufacturer.

[0053] The analysis method in the examples of this application is as follows:

[0054] The morphology of the coating was analyzed by scanning electron microscopy (SEM), using a JSM-6700F instrument.

[0055] The elemental analysis of the coating surface was performed by energy dispersive X-ray spectroscopy (Ti Kα1).

[0056] The wear resistance test of the coating is carried out under the test conditions according to the national standard GB / T30984.1-2015 "Solar Glass Part 1 Test Standard for Ultra-clear Patterned Glass".

[0057] The acid and alkali resistance test of the coating is carried out under the test conditions according to the national standard GB 9274-88 "Determination of resistance of paints and varnishes to liquid media".

[0058] The hot and cold cycle test of the coating is carried out according to the test conditions of the China Coatings Industry Association industry standard CNCIA-HG / T0004-2012 "Hot and Cold Cycle Test Method for Paint and Varnish Films".

[0059] The photocatalytic activity of the coating was tested under the following conditions: the coating was mixed with a 10 mmol / L methylene blue standard solution at a mass ratio of 1:1. The photodegradation of methylene blue was tested under simulated sunlight, and the absorbance change at the maximum absorption wavelength of methylene blue, 664 nm, was tracked.

[0060] Example 1

[0061] Step 1: Add 0.1 ml of tetrabutyl titanate to 40 ml of deionized water and stir to hydrolyze for 1 hour. Adjust the pH of the hydrolyzate to 7 with sodium hydroxide solution. Centrifuge the hydrolyzate to obtain a white solid. Wash the white solid with deionized water and ethanol, redisperse it in 49 ml of deionized water, add 2 ml of 30 wt% hydrogen peroxide solution, and heat at 90°C for 4 hours to obtain a transparent and clear titanium peroxide complex solution.

[0062] Step 2: Dissolve 4 g of tetraethyl silicate in 46 ml of ethanol, add ammonia water to adjust the pH to 12, and react at room temperature for 4 hours to obtain a transparent and clear silica sol.

[0063] Step 3: Add 10 g of titanium peroxide complex solution to 10 g of silica sol and age at 90° C. for 3 hours. The mass ratio of silica sol to titanium peroxide complex solution is 1:1.

[0064] Step 4: Evenly apply the titanium peroxide-silicon dioxide sol composite coating on the clean ultra-white glass surface by spraying.

[0065] Step 5: Curing with ultraviolet light of 365 nanometer wavelength for 24 hours to obtain a coating.

[0066] Example 2

[0067] The operation was the same as in Example 1, except that 10 g of the titanium peroxide complex solution was added to 5 g of the silica sol, and the mass ratio of the silica sol to the titanium peroxide complex solution was 0.5:1.

[0068] Example 3

[0069] The operation was the same as in Example 1, except that 5 g of the titanium peroxide complex solution was added to 20 g of the silica sol, and the mass ratio of the silica sol to the titanium peroxide complex solution was 4:1.

[0070] Comparative Example 1

[0071] The operation was the same as in Example 1, except that the step 1 of "adding 2 ml of 30 wt % hydrogen peroxide solution and heating at 90° C. for 4 hours" was omitted, and the rest remained unchanged.

[0072] Coating characterization and performance testing

[0073] The coatings prepared in the above examples were characterized and their performance tested, with Example 1 being used as a typical example.

[0074] Figure 1 The electron microscope image (a) and energy dispersive X-ray spectrometer (b) of the coating of Example 1 are shown. Figure 1 (a) It can be seen that the coating surface is flat and smooth. Figure 1 (b) It can be seen that the results of energy dispersive X-ray spectroscopy analysis show that titanium dioxide has been successfully attached to the surface of silicon dioxide particles, indicating that the preparation method of the composite coating has good controllability and stability. Figure 2 The wear resistance test diagram of the coating of Example 1 and Comparative Example 1 shows the wear resistance of the coating. After 1000 friction tests, the water contact angle is still maintained at 20°, proving that the coating has excellent anti-friction ability. Figure 3 、 Figure 4The acid and alkali resistance test results of the coatings of Example 1 and Comparative Example 1 respectively show that under strong acid and strong alkali conditions, the water contact angle always remains less than 20°, showing the excellent corrosion resistance of the coating. Figure 5 The results of the hot and cold cycle tests of the coatings of Example 1 and Comparative Example 1 show that after 4 cycles, the water contact angle of the coatings is still below 20°, which verifies the good weather resistance of the coatings. In order to evaluate the photocatalytic activity of the coatings, their ability to degrade organic pollutants was tested. Figure 6 The following graphs show the photocatalytic activity of the coatings of Example 1 and Comparative Example 1. Under simulated sunlight, the coatings exhibited excellent catalytic degradation of a methylene blue solution. Within 120 seconds, the coatings achieved 90% degradation of the methylene blue solution, fully demonstrating their high photocatalytic activity.

[0075] These test results show that the prepared titanium peroxide-silica sol composite coating has excellent performance in wear resistance, corrosion resistance, weather resistance and photocatalytic performance.

[0076] The above descriptions are merely a few embodiments of the present application and do not constitute any form of limitation to the present application. Although the present application discloses the preferred embodiments as above, they are not intended to limit the present application. Any technical personnel familiar with the present profession, without departing from the scope of the technical solution of the present application, using the technical content disclosed above to make slight changes or modifications are equivalent to equivalent implementation cases and fall within the scope of the technical solution.

Claims

1. A method for preparing a high-efficiency photosensitive transparent hybrid coating, characterized in that: include: S1 prepares titanium peroxide complex solution and silica sol respectively; S2: mixing the titanium peroxide complex solution and the silica sol, and aging them to obtain a titanium peroxide-silica sol composite coating.

2. The preparation method according to claim 1, characterized in that In step S2, the mass ratio of the silica sol to the titanium peroxide complex solution is 0.5 to 4:

1.

3. The preparation method according to claim 1, characterized in that In the step S2, the aging temperature is 80° C. to 100° C., and the aging time is 1 to 3 hours.

4. The preparation method according to claim 1, characterized in that In step S1, the method for preparing the titanium peroxide complex solution includes: A titanium source and water are mixed and hydrolyzed to obtain a hydrolyzate, and then the pH value of the hydrolyzate is adjusted to 7-12, separated to obtain a white solid, which is washed and redispersed in water, and a hydrogen peroxide solution is added and heated for reaction to obtain the titanium peroxide complex solution.

5. The preparation method according to claim 4, characterized in that The titanium source is selected from at least one of tetraethyl titanate, tetrabutyl titanate or tetraisopropyl titanate; Preferably, the hydrolysis time is 0.5h to 2h; Preferably, the pH value of the hydrolyzate is adjusted to 7 to 12 using sodium hydroxide solution; Preferably, the volume ratio of the titanium source to the hydrogen peroxide solution is 1:10 to 30; Preferably, the mass concentration of the hydrogen peroxide solution is 3 to 30%.

6. The preparation method according to claim 4, characterized in that The temperature of the heating reaction is 80° C. to 100° C., and the time of the heating reaction is 1 to 5 hours.

7. The preparation method according to claim 1, characterized in that In step S1, the method for preparing the silica sol includes: The silicon source is dissolved in water or an organic solvent, and an acid or a base is added to adjust the pH value to 7 to 12, and the reaction is carried out to obtain the silica sol.

8. The preparation method according to claim 7, characterized in that The silicon source is selected from at least one of methyl silicate, ethyl silicate, propyl silicate and butyl silicate; The organic solvent is selected from at least one of methanol, ethanol, and isopropanol; The acid is selected from at least one of hydrochloric acid and sulfuric acid; The base is selected from at least one of sodium hydroxide, potassium hydroxide, and ammonia water; Preferably, the reaction temperature is 20-60° C., and the reaction time is 2-24 h.

9. A highly efficient photocatalytically active coating, characterized in that: Applying a titanium peroxide-silicon dioxide sol composite coating to the surface of a substrate and curing the coating to obtain the coating; The titanium peroxide-silicon dioxide sol composite coating is prepared by the preparation method according to any one of claims 1 to 8.

10. The coating according to claim 9, characterized in that The coating method is selected from at least one of spraying, dipping or brushing; Preferably, the substrate is selected from glass and solar photovoltaic panels.

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