Photovoltaic coating as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of photovoltaic coatings, and discloses a photovoltaic coating as well as a preparation method and application thereof. The photovoltaic coating is prepared from the following raw materials: a solvent, an ultraviolet light absorber, a wetting agent, an antistatic agent, modified hydrophilic silicon dioxide, nano magnesium fluoride and nano tin dioxide, the modified hydrophilic silicon dioxide is hydrophilic silicon dioxide modified by ethylenediamine and glacial acetic acid. A coating formed by the photovoltaic coating is high in adhesive force and resistant to aging, and the light transmittance, the self-cleaning property and the antistatic property of photovoltaic glass can be obviously improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of photovoltaic coatings, and in particular relates to a photovoltaic coating and a preparation method and application thereof. Background Art

[0002] Due to long-term exposure to the outdoors, especially in extreme climates such as high humidity, high salt fog and strong ultraviolet rays, traditional photovoltaic glass has poor weather resistance and durability, and is prone to surface contamination, corrosion and aging, resulting in decreased light transmittance and loss of power generation efficiency. Therefore, it needs to be cleaned and maintained regularly, but manual cleaning and maintenance are inefficient, costly and have the risk of damaging components.

[0003] There have been studies on improving the performance of photovoltaic glass through coating technology. However, the functions of existing surface coatings are relatively simple. In order to improve the weather resistance of photovoltaic glass, some manufacturers simply increase the amount of ultraviolet absorbers added to the coating, which can easily lead to a decrease in other properties such as the adhesion of the coating. Summary of the Invention

[0004] The present invention aims to address at least one of the technical problems existing in the above-mentioned prior art. To this end, the present invention provides a photovoltaic coating, a preparation method, and applications thereof. The coating formed by the photovoltaic coating of the present invention not only has high adhesion and is resistant to aging, but also significantly improves the light transmittance, self-cleaning, and antistatic properties of photovoltaic glass.

[0005] The first aspect of the present invention provides a photovoltaic coating, wherein the raw materials for preparing the photovoltaic coating include: a solvent, an ultraviolet absorber, a wetting agent, an antistatic agent, modified hydrophilic silica, nano-magnesium fluoride and nano-tin dioxide; the modified hydrophilic silica is hydrophilic silica modified with ethylenediamine and glacial acetic acid.

[0006] In some embodiments of the present invention, the solvent includes anhydrous ethanol and water.

[0007] In some embodiments of the present invention, the volume ratio of anhydrous ethanol to water is 3:(5-10).

[0008] In some embodiments of the present invention, the mass percentage of the ultraviolet absorber in the solvent is 0.5% to 2%; and / or the mass percentage of the wetting agent in the solvent is 0.5% to 2%; and / or the mass percentage of the antistatic agent in the solvent is 0.5% to 2%; and / or the mass percentage of the modified hydrophilic silica in the solvent is 5% to 15%; and / or the mass percentage of the nano-magnesium fluoride in the solvent is 0.01% to 1%; and / or the mass percentage of the nano-tin dioxide in the solvent is 0.01% to 1%.

[0009] In some embodiments of the present invention, the particle size of the nano-magnesium fluoride is 10 to 30 nm; and / or the particle size of the nano-tin dioxide is 10 to 30 nm.

[0010] The second aspect of the present invention provides a method for preparing the photovoltaic coating according to the first aspect of the present invention, comprising the following steps:

[0011] The prepared raw materials are mixed and stirred to obtain the photovoltaic coating.

[0012] In some embodiments of the present invention, the method for preparing the photovoltaic coating comprises the following steps:

[0013] Anhydrous ethanol, an ultraviolet absorber, a wetting agent and an antistatic agent are mixed and stirred to obtain a mixture A;

[0014] Mixing water, modified hydrophilic silicon dioxide, nano magnesium fluoride and nano tin dioxide, and stirring to obtain a mixture B;

[0015] The mixed material A and the mixed material B are mixed and stirred to obtain the photovoltaic coating.

[0016] In some embodiments of the present invention, the method for preparing the modified hydrophilic silica comprises the following steps:

[0017] The hydrophilic silica is dispersed in anhydrous ethanol, and then ethylenediamine and glacial acetic acid are added, stirred, filtered, and the solid is collected and dried to obtain the modified hydrophilic silica.

[0018] In some embodiments of the present invention, the pH after adding ethylenediamine and glacial acetic acid is 4-6.

[0019] In some embodiments of the present invention, the mass ratio of the hydrophilic silica, ethylenediamine and glacial acetic acid is (1-3):1:1.

[0020] In some embodiments of the present invention, the drying is vacuum freeze-drying.

[0021] A third aspect of the present invention provides a photovoltaic glass, wherein a coating is provided on the surface of the photovoltaic glass, and the coating is formed by curing the photovoltaic coating according to the first aspect of the present invention.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] In the photovoltaic coating provided by the present invention, the modified hydrophilic silica used is hydrophilic silica modified with ethylenediamine and glacial acetic acid, and a layer of NH 3+, where ethylenediamine can form hydrogen bonds with the silanol groups on the surface of photovoltaic glass through its amino groups to achieve attachment. At the same time, under acidic conditions, the amino groups of ethylenediamine are protonated to form NH3 + , which can generate electrostatic attraction with the negatively charged groups on the surface of photovoltaic glass, thereby improving the adhesion ability of photovoltaic coatings; at the same time, under the joint action of ultraviolet absorbers, wetting agents, antistatic agents, nano-magnesium fluoride and nano-tin dioxide raw material components, the coating formed by the photovoltaic coating not only has high adhesion and aging resistance, but also can significantly improve the light transmittance, self-cleaning and antistatic properties of photovoltaic glass. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a photo of a water drip test performed on a glass slide coated with the photovoltaic coating of Example 1. DETAILED DESCRIPTION

[0025] The present invention is further described in detail below by way of specific examples. Unless otherwise specified, the raw materials, reagents, or devices used in the examples are all commercially available or can be obtained by conventional methods. Unless otherwise specified, all experiments or testing methods are conventional methods in the art.

[0026] Example 1

[0027] A photovoltaic coating, the preparation raw materials of which include: anhydrous ethanol, deionized water, ultraviolet absorber UV-1130, wetting agent SN-WET 996, antistatic agent RT-808 (a product of Shandong Juli Antistatic Technology Co., Ltd.), modified hydrophilic silicon dioxide, nano-magnesium fluoride with a particle size of 10 to 30 nm, and nano-tin dioxide with a particle size of 10 to 30 nm.

[0028] The preparation method of the modified hydrophilic silica comprises the following steps:

[0029] Disperse the hydrophilic silica powder in anhydrous ethanol, add ethylenediamine, stir for 30 minutes, then add glacial acetic acid, continue stirring for 30 minutes, filter and collect the solid;

[0030] The collected solid was placed in a vacuum freeze dryer and dried for 10 min to obtain modified hydrophilic silica powder;

[0031] The mass ratio of hydrophilic silica powder, ethylenediamine and glacial acetic acid is 1:1:1.

[0032] The preparation method of the photovoltaic coating comprises the following steps:

[0033] To anhydrous ethanol, 1% of the total mass of the alcohol and water was added an ultraviolet absorber UV-1130, 1% of the total mass of the alcohol and water was added a wetting agent SN-WET 996, and 1% of the total mass of the alcohol and water was added an antistatic agent RT-808, and the mixture was thoroughly mixed by magnetic stirring at room temperature (25° C.) for 30 minutes to obtain a mixture A;

[0034] Adding 10% of the total mass of the alcohol water to the modified hydrophilic silica powder, 0.5% of the total mass of the alcohol water to the nano-magnesium fluoride, and 0.5% of the total mass of the alcohol water to the nano-tin dioxide to the deionized water, and magnetically stirring for 30 minutes at room temperature to fully mix, to obtain a mixture B;

[0035] Mixture A and mixture B were mixed, and magnetically stirred at room temperature for 5 minutes to fully mix them to obtain a photovoltaic coating.

[0036] The total mass of alcohol-water refers to the total mass of two solvents, anhydrous ethanol and deionized water; the volume ratio of anhydrous ethanol to water is 3:7.

[0037] Example 2

[0038] A photovoltaic coating, the preparation raw materials of which include: anhydrous ethanol, deionized water, ultraviolet absorber UV-1130, wetting agent SN-WET 996, antistatic agent RT-808, modified hydrophilic silicon dioxide, nano magnesium fluoride with a particle size of 10 to 30 nm, and nano tin dioxide with a particle size of 10 to 30 nm.

[0039] The preparation method of the modified hydrophilic silica comprises the following steps:

[0040] Disperse the hydrophilic silica powder in anhydrous ethanol, add ethylenediamine, stir for 30 minutes, then add glacial acetic acid, continue stirring for 30 minutes, filter and collect the solid;

[0041] The collected solid was placed in a vacuum freeze dryer and dried for 10 min to obtain modified hydrophilic silica powder;

[0042] The mass ratio of hydrophilic silica powder, ethylenediamine and glacial acetic acid is 1:1:1.

[0043] The preparation method of the photovoltaic coating comprises the following steps:

[0044] Adding 2% of the total mass of the alcohol and water to the anhydrous ethanol, an ultraviolet absorber UV-1130, 2% of the total mass of the alcohol and water to the anhydrous ethanol, a wetting agent SN-WET 996, and 2% of the total mass of the alcohol and water to the anhydrous ethanol, and magnetically stirring for 30 minutes at room temperature (25° C.) to fully mix the mixture to obtain a mixture A;

[0045] Adding 15% of the total mass of the alcohol water to the modified hydrophilic silica powder, 1% of the total mass of the alcohol water to the nano-magnesium fluoride, and 1% of the total mass of the alcohol water to the nano-tin dioxide to the deionized water, and magnetically stirring for 30 minutes at room temperature to fully mix, to obtain a mixture B;

[0046] Mixture A and mixture B were mixed, and magnetically stirred at room temperature for 5 minutes to fully mix them to obtain a photovoltaic coating.

[0047] Example 3

[0048] A photovoltaic coating, the preparation raw materials of which include: anhydrous ethanol, deionized water, ultraviolet absorber UV-1130, wetting agent SN-WET 996, antistatic agent RT-808, modified hydrophilic silicon dioxide, nano magnesium fluoride with a particle size of 10 to 30 nm, and nano tin dioxide with a particle size of 10 to 30 nm.

[0049] The preparation method of the modified hydrophilic silica comprises the following steps:

[0050] Disperse the hydrophilic silica powder in anhydrous ethanol, add ethylenediamine, stir for 30 minutes, then add glacial acetic acid, continue stirring for 30 minutes, filter and collect the solid;

[0051] The collected solid was placed in a vacuum freeze dryer and dried for 10 min to obtain modified hydrophilic silica powder;

[0052] The mass ratio of hydrophilic silica powder, ethylenediamine and glacial acetic acid is 1:1:1.

[0053] The preparation method of the photovoltaic coating comprises the following steps:

[0054] To anhydrous ethanol, 0.5% of the total weight of the alcohol and water was added an ultraviolet absorber UV-1130, 0.5% of the total weight of the alcohol and water was added a wetting agent SN-WET 996, and 0.5% of the total weight of the alcohol and water was added an antistatic agent RT-808, and the mixture was thoroughly mixed by magnetic stirring at room temperature (25° C.) for 30 minutes to obtain a mixture A;

[0055] Add 5% of the total mass of the alcohol water to the modified hydrophilic silica powder, 0.01% of the total mass of the alcohol water to the nano-magnesium fluoride, and 0.01% of the total mass of the alcohol water to the nano-tin dioxide, and stir magnetically for 30 minutes at room temperature to fully mix to obtain a mixture B;

[0056] Mixture A and mixture B were mixed, and magnetically stirred at room temperature for 5 minutes to fully mix them to obtain a photovoltaic coating.

[0057] Comparative Example 1 (modification process lacks ethylenediamine)

[0058] A photovoltaic coating, the preparation raw materials of which include: anhydrous ethanol, deionized water, ultraviolet absorber UV-1130, wetting agent SN-WET 996, antistatic agent RT-808, modified hydrophilic silicon dioxide, nano magnesium fluoride with a particle size of 10 to 30 nm, and nano tin dioxide with a particle size of 10 to 30 nm.

[0059] The preparation method of the modified hydrophilic silica comprises the following steps:

[0060] Disperse the hydrophilic silica powder in anhydrous ethanol, add glacial acetic acid, continue stirring for 30 minutes, filter and collect the solid;

[0061] The collected solid was placed in a vacuum freeze dryer and dried for 10 min to obtain modified hydrophilic silica powder;

[0062] The mass ratio of hydrophilic silica powder to glacial acetic acid is 1:1.

[0063] The preparation method of the photovoltaic coating comprises the following steps:

[0064] To anhydrous ethanol, 1% of the total mass of the alcohol and water was added an ultraviolet absorber UV-1130, 1% of the total mass of the alcohol and water was added a wetting agent SN-WET 996, and 1% of the total mass of the alcohol and water was added an antistatic agent RT-808, and the mixture was thoroughly mixed by magnetic stirring at room temperature (25° C.) for 30 minutes to obtain a mixture A;

[0065] Adding 10% of the total mass of the alcohol water to the modified hydrophilic silica powder, 0.5% of the total mass of the alcohol water to the nano-magnesium fluoride, and 0.5% of the total mass of the alcohol water to the nano-tin dioxide to the deionized water, and magnetically stirring for 30 minutes at room temperature to fully mix, to obtain a mixture B;

[0066] Mixture A and mixture B were mixed, and magnetically stirred at room temperature for 5 minutes to fully mix them to obtain a photovoltaic coating.

[0067] Comparative Example 2 (Lack of Glacial Acetic Acid in Modification Process)

[0068] A photovoltaic coating, the preparation raw materials of which include: anhydrous ethanol, deionized water, ultraviolet absorber UV-1130, wetting agent SN-WET 996, antistatic agent RT-808, modified hydrophilic silicon dioxide, nano magnesium fluoride with a particle size of 10 to 30 nm, and nano tin dioxide with a particle size of 10 to 30 nm.

[0069] The preparation method of the modified hydrophilic silica comprises the following steps:

[0070] Disperse the hydrophilic silica powder in anhydrous ethanol, add ethylenediamine, stir for 30 minutes, filter and collect the solid;

[0071] The collected solid was placed in a vacuum freeze dryer and dried for 10 min to obtain modified hydrophilic silica powder;

[0072] The mass ratio of hydrophilic silica powder to ethylenediamine is 1:1.

[0073] The preparation method of the photovoltaic coating comprises the following steps:

[0074] To anhydrous ethanol, 1% of the total mass of the alcohol and water was added an ultraviolet absorber UV-1130, 1% of the total mass of the alcohol and water was added a wetting agent SN-WET 996, and 1% of the total mass of the alcohol and water was added an antistatic agent RT-808, and the mixture was thoroughly mixed by magnetic stirring at room temperature (25° C.) for 30 minutes to obtain a mixture A;

[0075] Adding 10% of the total mass of the alcohol water to the modified hydrophilic silica powder, 0.5% of the total mass of the alcohol water to the nano-magnesium fluoride, and 0.5% of the total mass of the alcohol water to the nano-tin dioxide to the deionized water, and magnetically stirring for 30 minutes at room temperature to fully mix, to obtain a mixture B;

[0076] Mixture A and mixture B were mixed, and magnetically stirred at room temperature for 5 minutes to fully mix them to obtain a photovoltaic coating.

[0077] Comparative Example 3

[0078] The photovoltaic coating on the market is manufactured by Huaxia Jiahe and its product is Dashu Q100.

[0079] Product performance testing

[0080] The glass slide was cleaned with clean water. After the water dried, the glass slide was cleaned again with isopropyl alcohol. After the isopropyl alcohol dried, the photovoltaic coatings of Examples 1-3 and Comparative Examples 1-3 were respectively applied to one side of the glass slide by roller coating. After natural drying and curing to form a coating, relevant performance tests were performed.

[0081] The performance test results are shown in Tables 1-4; the blank control group is a glass slide that has been cleaned but not coated with photovoltaic coating.

[0082] Table 1

[0083] Group Transmittance / % Example 1 93.5 Example 2 93.8 Example 3 93.6 Comparative Example 1 92.9 Comparative Example 2 93.2 Comparative Example 3 90.2 Blank control group 90.5

[0084] Table 2

[0085]

[0086]

[0087] Table 3

[0088] Group Surface resistance / Ω Example 1 <![CDATA[1.2×10 6 ]]> Example 2 <![CDATA[1.31×10 6 ]]> Example 3 <![CDATA[1.16×10 6 ]]> Comparative Example 1 <![CDATA[1.82×10 9 ]]> Comparative Example 2 <![CDATA[1.72×10 8 ]]> Comparative Example 3 <![CDATA[1.59×10 12 ]]> Blank control group <![CDATA[1.58×10 12 ]]>

[0089] Table 4

[0090] Group Adhesion (wet friction) Example 1 >15,000 times, no effect on hydrophilicity and permeability Example 2 >15,000 times, no effect on hydrophilicity and permeability Example 3 >15,000 times, no effect on hydrophilicity and permeability Comparative Example 1 >10,000 times Comparative Example 2 >10,000 times Comparative Example 3 >9000 times

[0091] As can be seen from Table 1, the transmittance of the glass slide coated with the photovoltaic coating of Examples 1-3 is significantly greater than that of the glass slide coated with the traditional photovoltaic coating (Comparative Example 3) and the glass slide itself (blank control group), indicating that the photovoltaic coating of the present invention has anti-transmittance and can improve the transmittance of photovoltaic glass.

[0092] As can be seen from Table 2, the photovoltaic coating of the present invention is a hydrophilic coating. The coating formed by it has excellent hydrophilicity and a water contact angle of less than 3°, thereby having good self-cleaning properties. Dust and dirt on it are easily washed away by rainwater, reducing the workload of cleaning and maintenance and lowering operating costs.

[0093] It can be seen from Tables 3 and 4 that the coating formed by the photovoltaic coating of the present invention also has excellent antistatic properties and adhesion properties.

[0094] The glass slide coated with the photovoltaic coating of Example 1 was further subjected to a water drop test. Figure 1 As shown, it can be seen that the coating is flat, smooth, colorless and transparent, and the water droplets spread out in the form of a liquid film on the coating surface of the slide, indicating good hydrophilicity.

[0095] In addition, the glass slides coated with the photovoltaic coatings of Examples 1-3 were placed in a constant temperature and humidity chamber (60° C., 60% humidity) for aging tests. After 100 hours, each sample maintained good hydrophilicity with a water contact angle of <5°.

[0096] The above specifically describes the preferred embodiments of the present invention, but the invention is not limited to the embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A photovoltaic coating, characterized in that: The raw materials for preparing the photovoltaic coating include: solvent, ultraviolet absorber, wetting agent, antistatic agent, modified hydrophilic silicon dioxide, nano magnesium fluoride and nano tin dioxide; the modified hydrophilic silicon dioxide is hydrophilic silicon dioxide modified with ethylenediamine and glacial acetic acid.

2. The photovoltaic coating according to claim 1, characterized in that The solvent includes anhydrous ethanol and water.

3. The photovoltaic coating according to claim 2, characterized in that: The volume ratio of the anhydrous ethanol to water is 3:(5-10).

4. The photovoltaic coating according to claim 1, characterized in that: The mass percentage of the ultraviolet absorber in the solvent is 0.5% to 2%; and / or the mass percentage of the wetting agent in the solvent is 0.5% to 2%; and / or the mass percentage of the antistatic agent in the solvent is 0.5% to 2%; and / or the mass percentage of the modified hydrophilic silicon dioxide in the solvent is 5% to 15%; and / or the mass percentage of the nano-magnesium fluoride in the solvent is 0.01% to 1%; and / or the mass percentage of the nano-tin dioxide in the solvent is 0.01% to 1%.

5. The photovoltaic coating according to claim 1, characterized in that: The particle size of the nano magnesium fluoride is 10 to 30 nm; and / or the particle size of the nano tin dioxide is 10 to 30 nm.

6. The method for preparing the photovoltaic coating according to any one of claims 1 to 5, characterized in that: The following steps are involved: The prepared raw materials are mixed and stirred to obtain the photovoltaic coating.

7. The preparation method according to claim 6, characterized in that The following steps are involved: Anhydrous ethanol, an ultraviolet absorber, a wetting agent and an antistatic agent are mixed and stirred to obtain a mixture A; Mixing water, modified hydrophilic silicon dioxide, nano magnesium fluoride and nano tin dioxide, and stirring to obtain a mixture B; The mixed material A and the mixed material B are mixed and stirred to obtain the photovoltaic coating.

8. The preparation method according to claim 7, characterized in that The preparation method of the modified hydrophilic silica comprises the following steps: The hydrophilic silica is dispersed in anhydrous ethanol, and then ethylenediamine and glacial acetic acid are added, stirred, filtered, and the solid is collected and dried to obtain the modified hydrophilic silica.

9. The preparation method according to claim 8, characterized in that The mass ratio of the hydrophilic silica, ethylenediamine and glacial acetic acid is (1-3):1:

1.

10. A photovoltaic glass, characterized in that: The surface of the photovoltaic glass is provided with a coating, and the coating is formed by curing the photovoltaic coating according to any one of claims 1 to 5.

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