Preparation method of photovoltaic coating material
By using nitric acid to adjust the pH value of ethanol during the preparation of photovoltaic coating materials, adding catalysts, stirring and heating, and ethanol replaces moisture in the wet gel, the problem of long aging time is solved, and the preparation of high-purity Tio2/Sio2 powder and high transmittance photovoltaic coating are achieved.
Patent Information
- Application Number
- CN202411874589.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-19
- Publication Date
- 2025-03-28
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
In the preparation process of photovoltaic coating materials, the aging time is usually 24 hours to 48 hours, resulting in a long time and affecting production efficiency.
The anhydrous ethanol was adjusted to pH 4-5 by using 5% nitric acid, and the deionized water formation solution was added, aniline and acetone formation catalyst was added, butyl titanate/ethyl silicate ethanol mixed solution was added, vigorously stirring and heating, the hydrolysis temperature was controlled at 20-30°C, and replaced with ethanol three times after the wet gel of Tio2/Sio2 was aged to remove residual solvents and by-products.
Through these steps, the aging time can be significantly shortened, the purity of Tio2/Sio2 powder and the transmittance of the photovoltaic coating can be improved, and the average transmittance of the coated glass in the visible light range can be ensured that the average transmittance of the coated glass in the visible light range is higher than 85%.
Smart Images
Figure CN119707310A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of photovoltaic coating, and in particular to a method for preparing a photovoltaic coating material. Background Art
[0002] The surface glass is located at the outermost layer of the photovoltaic panel. It is transparent and highly transmittance, and is used to cover and protect the internal solar cells. This type of glass is generally made of ultra-white tempered glass, which can prevent both sunlight reflection and hot spot effects. In order to improve the transmittance and self-cleaning properties of the surface glass, a coating is generally applied to the surface glass. Studies have shown that the TiO2-SiO2 nanostructure prepared by the sol-gel method can be used on the surface of photovoltaic glass to improve transmittance and achieve self-cleaning function, thereby improving the conversion efficiency of photovoltaic modules and their ability to adapt to complex environments.
[0003] TiO2-SiO2 sol is generally evenly applied on the glass surface using an extrusion wire rod coater. During the preparation of TiO2-SiO2 sol, butyl titanate and ethyl silicate need to be dissolved in appropriate amounts of ethanol respectively and aged to obtain Tio2 / Sio2 gel, and then the Tio2 / Sio2 gel is dried and ground to obtain Tio2 / Sio2 powder, and then the Tio2 / Sio2 powder is mixed into deionized water to obtain TiO2-SiO2 sol.
[0004] During the preparation process, butyl titanate and ethyl silicate are respectively dissolved in an appropriate amount of ethanol and aged. During the aging process, the mixed solution is sealed and aged at room temperature. The aging time is usually 24 to 48 hours, and the aging process takes a long time. Summary of the invention
[0005] The purpose of the present application is to solve the problem raised in the above-mentioned background technology that during the aging process, the mixed solution is sealed and aged at room temperature, and the aging time is usually 24 to 48 hours, and the aging process takes a long time. The present application provides a method for preparing a photovoltaic coating material.
[0006] In order to achieve the above-mentioned purpose, this application specifically adopts the following technical solutions:
[0007] A method for preparing a photovoltaic coating material, the preparation method is as follows:
[0008] S1: Preparation of Tio2-Sio2 sol, raw material preparation, butyl titanate (TBOT) and tetraethyl orthosilicate (TEOS) as main raw materials, ethanol, acetone, aniline, nitric acid as solvent and catalyst;
[0009] S2: dissolving butyl titanate and ethyl silicate in appropriate amounts of ethanol, and aging them to obtain a Tio2 / Sio2 gel;
[0010] S3: drying and grinding the obtained gel to obtain a composite oxide support of Tio2 / Sio2;
[0011] S4: then adding the oxide carrier into deionized water, and then stirring or ultrasonic treatment, so that the powder is initially wetted and dispersed to form a mixed sol of Tio2-Sio2;
[0012] S5: The Tio2-Sio2 mixed sol is then added into an extrusion wire rod coater, and then the Tio2-Sio2 mixed solution is evenly applied on the photovoltaic panel, and then air-dried to form a Tio2-Sio2 film.
[0013] Furthermore, the aniline, acetone and nitric acid are added to anhydrous ethanol in a certain proportion to form a corresponding catalyst, and the catalyst is added to the ethanol mixed solution of butyl titanate / ethyl silicate, thereby promoting the gelation process of the solution.
[0014] Furthermore, 5% nitric acid is used to adjust the pH of anhydrous ethanol to between 4 and 5, and then deionized water is added to form a solution, thereby improving the properties of the final sol, such as particle size, stability, etc.
[0015] Furthermore, the catalyst is added to a mixed solution of butyl titanate / ethyl silicate and ethanol, and stirred vigorously, while the hydrolysis temperature is controlled at 20-30° C. This allows the hydrolysis to be faster and the sol-gel reaction to be maintained at a suitable reaction condition.
[0016] Furthermore, the molar ratio of the butyl titanate to the ethanol is 1:40, and the molar ratio of the ethyl orthosilicate to the ethanol is 1:4, so as to obtain a composite material with desired properties.
[0017] Furthermore, after aging the wet Tio2 / Sio2 gel for 2 days, the gel was replaced with ethanol 3 times, each time for 12 hours, to remove residual solvent and byproducts, thereby reducing the surface tension of the liquid in the gel pores and facilitating the subsequent drying process.
[0018] Furthermore, the Tio2 / Sio2 gel is dried and then calcined in a resistance furnace to obtain high-purity Tio2 / Sio2 powder, and the ratio of TiO2 to SiO2 is adjusted so that the molar fraction of SiO2 is greater than 50%. Thus, high-purity TiO2 / SiO2 powder can be prepared, and the average transmittance of the coated glass in the visible light range can be higher than 85%.
[0019] In summary, the present application includes at least one of the following beneficial effects:
[0020] 1. In the present application, 5% nitric acid is used to adjust anhydrous ethanol to a pH between 4 and 5, and then deionized water is added to form a solution, and then aniline and acetone are added to the solution to form a catalyst, and then the catalyst is added to an ethanol mixed solution of butyl titanate / ethyl silicate. During the mixing process, the solution is continuously stirred, and the solution is heated by a heating device to maintain the solution at 20-30°C, thereby achieving the purpose of making aging faster, keeping the sol-gel reaction under suitable reaction conditions, allowing it to fully react, and obtaining a Tio2 / Sio2 powder with higher purity.
[0021] 2. In the present application, after the wet gel of Tio2 / Sio2 has been aged for 2 days, ethanol is used to replace the water in the wet gel. Each replacement lasts for 12 hours, and a total of 3 replacements are required. During the replacement process, the wet gel is immersed in a container filled with ethanol, and the ethanol is replaced at least twice during the period. This achieves the purpose of reducing the surface tension of the liquid in the pores of the gel, which is helpful for the subsequent drying process. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 It is a schematic diagram of the preparation method in this application. DETAILED DESCRIPTION
[0023] The following is combined with Figure 1 This application is described in further detail.
[0024] The embodiment of the present application discloses a method for preparing a photovoltaic coating material.
[0025] A method for preparing a photovoltaic coating material, the preparation method is as follows:
[0026] S1: Preparation of Tio2-Sio2 sol, raw material preparation, butyl titanate (TBOT) and tetraethyl orthosilicate (TEOS) as main raw materials, ethanol, acetone, aniline, nitric acid as solvent and catalyst;
[0027] S2: dissolving butyl titanate and ethyl silicate in appropriate amounts of ethanol, and aging them to obtain a Tio2 / Sio2 gel;
[0028] S3: drying and grinding the obtained gel to obtain a composite oxide support of Tio2 / Sio2;
[0029] S4: then adding the oxide carrier into deionized water, and then stirring or ultrasonic treatment, so that the powder is initially wetted and dispersed to form a mixed sol of Tio2-Sio2;
[0030] S5: The Tio2-Sio2 mixed sol is then added into an extrusion wire rod coater, and then the Tio2-Sio2 mixed solution is evenly applied on the photovoltaic panel, and then air-dried to form a Tio2-Sio2 film.
[0031] Aniline, acetone, and nitric acid are added to anhydrous ethanol in a certain proportion to form a corresponding catalyst, and the catalyst is added to an ethanol mixed solution of butyl titanate / ethyl silicate. A mixed solution of aniline, acetone, nitric acid, and ethanol is added to the above solution, and the sol-gel process is promoted by the in-situ water generation method of aniline, acetone, and nitric acid. By mixing aniline, acetone, nitric acid, and ethanol to form a catalyst, the solution gel process can be promoted.
[0032] 5% nitric acid is used to adjust the pH of anhydrous ethanol to between 4 and 5, and then deionized water is added to form a solution. By adjusting the pH value with nitric acid and adding deionized water, suitable conditions can be created for the subsequent sol-gel reaction, thereby improving the properties of the final sol, such as particle size, stability, etc.
[0033] The catalyst is added to the mixed solution of butyl titanate / ethyl silicate and ethanol, and stirred vigorously, while the hydrolysis temperature is controlled at 20-30°C. The catalyst is added to the mixed solution of butyl titanate / ethyl silicate and ethanol, and the solution is continuously stirred during the pouring process, and the solution is heated by a heating device to keep the solution at 20-30°C, so that the hydrolysis can be faster and the sol-gel reaction can be kept under suitable reaction conditions.
[0034] The molar ratio between butyl titanate and ethanol is 1:40, and the molar ratio between ethyl orthosilicate and ethanol is 1:4. By precisely controlling these ratios, the preparation process of TiO2 / SiO2 composite sol can be optimized to obtain a composite material with desired properties.
[0035] After aging for 2 days, the wet gel of Tio2 / Sio2 was replaced with ethanol three times, each time for 12 hours, to remove residual solvents and byproducts. The water in the wet gel was replaced with ethanol, each replacement time was 12 hours, and a total of 3 replacements were required. During the replacement process, the wet gel was immersed in a container filled with ethanol, and the ethanol was replaced at least twice, so as to reduce the surface tension of the liquid in the gel pores and help the subsequent drying process.
[0036] The Tio2 / Sio2 gel is dried and then calcined in a resistance furnace to obtain high-purity Tio2 / Sio2 powder. The gel after solvent replacement is placed at 100-120°C for 1-3 hours to remove moisture and some organic matter in the gel. The dried gel is calcined at 350°C for 2 hours to further remove residual organic matter and promote the transformation of the gel into high-purity TiO2 / SiO2 powder. The ratio of TiO2 and SiO2 can be adjusted to optimize the optical properties and wettability of the composite film. When the molar fraction of SiO2 is greater than 50%, high-purity TiO2 / SiO2 powder can be prepared, which can achieve an average transmittance of more than 85% in the visible light range of the coated glass.
Claims
1. A method for preparing a photovoltaic coating material, characterized in that: The preparation method is as follows: S1: Preparation of Tio2-Sio2 sol, raw material preparation, butyl titanate (TBOT) and tetraethyl orthosilicate (TEOS) as main raw materials, ethanol, acetone, aniline, nitric acid as solvent and catalyst; S2: dissolving butyl titanate and ethyl silicate in appropriate amounts of ethanol, and subjecting them to natural aging to obtain a Tio2 / Sio2 gel; S3: drying and grinding the obtained gel to obtain a composite oxide support of Tio2 / Sio2; S4: then adding the oxide carrier into deionized water, and then stirring or ultrasonic treatment, so that the powder is initially wetted and dispersed to form a mixed sol of Tio2-Sio2; S5: The Tio2-Sio2 mixed sol is then added into an extrusion wire rod coater, and then the Tio2-Sio2 mixed solution is evenly applied on the photovoltaic panel, and then air-dried to form a Tio2-Sio2 film.
2. The method for preparing a photovoltaic coating material according to claim 1, characterized in that: The aniline, acetone and nitric acid are added to anhydrous ethanol in a certain proportion to form a corresponding catalyst, and the catalyst is added to an ethanol mixed solution of butyl titanate / ethyl silicate.
3. The method for preparing a photovoltaic coating material according to claim 2, characterized in that: Anhydrous ethanol was adjusted to a pH between 4 and 5 using 5% nitric acid, and then deionized water was added to form a solution.
4. The method for preparing a photovoltaic coating material according to claim 3, characterized in that: The catalyst is added into the io2 / Sio2 ethanol mixed solution and stirred vigorously while the hydrolysis temperature is controlled at 20-30°C.
5. The method for preparing a photovoltaic coating material according to claim 1, characterized in that: The molar ratio of the butyl titanate to the ethanol is 28:27, and the molar ratio of the ethyl orthosilicate to the ethanol is 1:
5.
6. The method for preparing a photovoltaic coating material according to claim 1, characterized in that: The wet gel of Tio2 / Sio2 was aged for 2 days and then replaced with ethanol 3 times, each time for 12 hours, to remove residual solvent and by-products.
7. The method for preparing a photovoltaic coating material according to claim 1, characterized in that: The Tio2 / Sio2 gel is dried and then calcined in a resistance furnace to obtain high-purity Tio2 / Sio2 powder.