Multifunctional coated glass for photovoltaic module

Abstract

According to the multifunctional coated glass for the photovoltaic module, the coated glass comprises a glass plate and a multifunctional coating fixedly connected with the glass plate, and the multifunctional coating comprises a bottom coating attached to the surface of the glass plate and a surface coating attached to the bottom coating; blade coating lines of the bottom coating and the surface coating are perpendicular to each other; the multifunctional coating is formed by mixing a component A, a component B and nanoparticles, the component A is a curing agent, the component B is functional resin, and the component A and the component B are mixed according to the ratio of 1: 9; the functional resin is a tetrafluoroethylene and vinyl monomer copolymerization product; the nanoparticles comprise silicon oxide or titanium oxide; and the bottom coating and the surface coating on the light receiving surface of the glass plate are distributed on the glass plate in a latticed manner or fully cover the glass plate. The corrosion resistance and wear resistance of the photovoltaic glass plate to acidic materials are improved.

Description

Technical Field

[0001] The present application relates to the technical field of photovoltaic glass, and in particular to a multifunctional coated glass for photovoltaic modules. Background Art

[0002] Photovoltaic modules are common basic modules in the existing new energy field that convert light energy into electrical energy. They include solar cells that absorb sunlight to generate electricity, wires connecting the solar cells, light-transmitting glass that encapsulates the solar cells, and aluminum frames arranged around the projection glass. They work outdoors for a long time without any shelter. Basic natural factors such as impurities in the air and rain have an impact on the glass and aluminum frame on their surface. The most serious are photovoltaic modules near chemical plants, because the exhaust gas of chemical plants may contain more sulfides, fluorides, nitrides, etc. These components will produce acidic substances when they come into contact with water, such as sulfuric acid, hydrochloric acid, hydrofluoric acid, nitric acid, etc. These acidic substances will not only corrode the aluminum frame of the photovoltaic module, but also corrode the glass over time, because the main component of glass is silicon oxide, which can react with hydrofluoric acid to produce a white mixture of fluorosilicic acid and orthosilicic acid that is insoluble in water, which has a serious corrosive effect on photovoltaic glass.

[0003] In order to protect photovoltaic glass from corrosion, the conventional method in the prior art is to glaze the glass surface. However, this glazed glass will crack or explode due to the internal stress of the coating, and the coating will turn yellow due to oxidation due to light over time, which seriously affects the light absorption effect of the photovoltaic glass and also increases the reflectivity of the glass. Summary of the invention

[0004] The embodiment of the present invention provides a multifunctional coated glass for a photovoltaic module. The coated glass has the characteristics of corrosion resistance and wear resistance, and can solve the shortcomings of the prior art.

[0005] The present invention provides a multifunctional coated glass for a photovoltaic module, wherein the coated glass comprises a glass plate and a multifunctional coating fixedly connected to the glass plate, wherein the multifunctional coating comprises a base coating bonded to the surface of the glass plate and a top coating bonded to the base coating; the scraping lines of the base coating and the top coating are perpendicular to each other;

[0006] The multifunctional coating is formed by mixing component A, component B and nanoparticles, wherein component A is a curing agent, component B is a functional resin, and the components A and B are mixed in a ratio of 1:9; the functional resin is a copolymer of tetrafluoroethylene and a vinyl monomer; the nanoparticles include silicon oxide or titanium oxide;

[0007] The base coating and the top coating on the light-receiving surface of the glass plate are distributed in a grid pattern or fully cover the glass plate.

[0008] Optionally, the multifunctional coating has a thickness range of 80-120 nm.

[0009] Optionally, the glass plate in contact with the battery unit further includes a conductive layer, and the conductive layer is disposed between the base coating and the glass plate.

[0010] Optionally, the distribution area of ​​the grid-shaped distribution avoids the light-receiving area of ​​the battery unit.

[0011] Optionally, the curing agent includes: one or more of an imidazole curing agent, an amine curing agent, and an isocyanate curing agent.

[0012] Optionally, the scraping process of the multifunctional coating includes:

[0013] Use a special cleaning agent for photovoltaic glass to complete a cleaning;

[0014] Use clean water to complete the secondary cleaning;

[0015] Check the pH value and determine whether it is 7. If it is, proceed to the next step, otherwise proceed to the previous step.

[0016] Applying a base coating by scraping, and curing the base coating by standing at room temperature;

[0017] The top coat was knife coated.

[0018] Optionally, the thickness ratio of the base coating to the top coating is 1:2.

[0019] The beneficial effects of the present invention are:

[0020] 1) Improved the corrosion resistance and wear resistance of photovoltaic glass panels;

[0021] 2) Replace the existing glaze design, reduce the occurrence of photovoltaic glass panel explosion, and increase the service life of photovoltaic glass. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic cross-sectional view showing a multifunctional coated glass for a photovoltaic module provided in an embodiment of the present application;

[0023] Figure 2 A front schematic diagram showing a grid-like distribution of a multifunctional coating on a glass plate in an embodiment of the present application;

[0024] Figure 3 An exploded view of a photovoltaic module related to the present application is shown.

[0025] In the figure:

[0026] 1: Glass plate; 2: Base coating; 3: Top coating. DETAILED DESCRIPTION

[0027] The technical solutions in the application embodiments will be described clearly and completely below in conjunction with the accompanying drawings in the application embodiments. In addition, the phrases "in one embodiment" or "in an embodiment" appearing in various places throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics may be combined in one or more embodiments in any suitable manner.

[0028] It should also be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity from another entity, and do not necessarily require or imply any such actual relationship or order between these entities. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that an article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such article or terminal device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the article or terminal device including the elements.

[0029] Reference Figures 1 to 3 As shown, the present invention provides a multifunctional coated glass for photovoltaic modules, the coated glass comprises a glass plate 1 and a multifunctional coating fixedly connected to the glass plate 1, the multifunctional coating comprises a primer layer 2 bonded to the surface of the glass plate 1, and a top coating layer 3 attached to the primer layer 2; the scraping lines of the primer layer 2 and the top coating layer 3 are perpendicular to each other; the multifunctional coating is formed by a mixture of component A, component B and nanoparticles, the component A is a curing agent, the component B is a functional resin, and the component A and the component B are mixed in a ratio of 1:9; the functional resin is a copolymer of tetrafluoroethylene and a vinyl monomer; the nanoparticles comprise silicon oxide or titanium oxide; the primer layer 2 and the top coating layer 3 on the light-receiving surface of the glass plate 1 are distributed in a grid shape or fully cover the glass plate 1.

[0030] The aforementioned curing agent includes one or more of an imidazole curing agent, an amine curing agent, and an isocyanate curing agent, and this embodiment does not impose any specific restrictions on this. In addition, the thickness range of the multifunctional coating is 80-120 nm. The thickness ratio of the base coating 2 to the top coating 3 is 1:2, which can maximize the guarantee that the top coating can be firmly attached to the surface of the glass plate 1.

[0031] In addition, as mentioned above, the multifunctional coating can be arranged on the glass plate 1 in a grid-like gap distribution, or the entire surface of the glass plate 1 can be completely covered, under the premise of improving the wear resistance and hardness of the glass plate 1. Figure 2As shown, the grid-shaped distribution can not only reduce the amount of multifunctional coating, but also reduce the stress on the surface of the glass plate 1, avoiding stress concentration on the glass plate 1 and cracking or bursting. It should also be noted that the distribution area of ​​the grid-shaped distribution avoids the light-receiving area of ​​the battery unit, and the light-receiving area of ​​the battery unit affects the power generation efficiency of the entire photovoltaic module. Compared with the light directly penetrating into the glass plate 1, the former may lose part of the sunlight and affect the power generation efficiency of the battery unit. Therefore, the distribution area of ​​the grid-shaped distribution avoids the light-receiving area of ​​the battery unit.

[0032] In addition, the base coating 2 or the top coating 3 can be cured at room temperature, the surface can become dry in 10-20 minutes, and can be completely cured in 24 hours.

[0033] like Figure 3 The figure shows an exploded view of the components of a basic photovoltaic module. EVA is a hot-melt film, which is used to melt the welding strips connecting adjacent battery cells in the battery unit after heating and stick them on the battery cells. The backplane is the mounting base in the photovoltaic module. The electricity generated by the battery cell is led out and connected to the junction box. Encapsulated glass and aluminum frame are arranged on top of the battery cell. The light-receiving surface of the multifunctional coated glass provided by the present invention is opposite to the battery cell. The multifunctional coating on the light-receiving surface increases the corrosion resistance and wear resistance of the glass, thereby improving the life of the entire photovoltaic module.

[0034] In the examples, various parameters are tested and verified to demonstrate the performance of the present invention. Some inspection standards and performance test results in the experiments are specifically described below:

[0035] 1) The surface of the glass plate 1 needs to be cleaned before primer coating. Wipe the surface of the component vigorously with a clean dust-free paper towel. If there is no black or yellow mark on the surface of the paper towel, the dust is considered to be cleaned. In addition, pour clean water on the glass plate 1 to form a complete water film covering the panel. If it does not shrink, the oil stain is considered to be cleaned.

[0036] 2) Reflectivity test of glass plate 1 after coating with multifunctional coating

[0037] After the scraping and coating construction, the reflectivity of the surface of the glass plate 1 is tested, and the reflectivity of the component surface is tested with a reflectivity detector. Usually, the reflectivity of the corroded glass plate 1 is in the range of 3-4%. After the multifunctional coating is scraped and coated by the present application, the reflectivity is reduced to below 2.5, and the reflectivity of about 1.6 is regarded as a qualified glass plate 1.

[0038] 3) Appearance inspection of glass plate 1

[0039] Through equipment or human eye inspection, the inspector's vision is above 1.0, the human eye is 30cm away from the tested product, and it is observed with the naked eye. The surface of the photovoltaic glass after construction is not allowed to have scratches, bubbles, lumps, sand particles and other defects that affect the appearance. In order to avoid these defects, the wind speed in the environment during scraping and coating must be less than level 3, the temperature must be above 10℃, and the speed of spraying or scraping must be adapted to the wind speed of the environment.

[0040] 4) Acid resistance test

[0041] After the multifunctional coating is applied to the glass of the photovoltaic module, manually wipe it with a 0.01% hydrofluoric acid solution and leave it for 48 hours. If the coating does not peel or flake off and there is no corrosion, it is considered to be acid-resistant.

[0042] 5) Light transmittance test

[0043] Light transmittance shows the reflectivity of photovoltaic glass to light. The stronger the light transmittance, the lower its reflectivity to light, that is, the smaller the loss of light after passing through the photovoltaic glass. In the experiment, the light reflectivity of the multifunctional coated glass provided by the present invention was reduced to below 2.5.

[0044] It should be noted that the scraping process of the aforementioned multifunctional coating includes:

[0045] Step 1: Use a special cleaning agent for photovoltaic glass to complete a cleaning process;

[0046] Step 2: Use clean water to complete secondary cleaning;

[0047] Step 3: Check the pH value and determine whether it is 7. If it is, proceed to the next step, otherwise proceed to the previous step.

[0048] Step 4, scraping the base coating 2, and curing the base coating 2 at room temperature;

[0049] Step five: scrape and apply the top coating 3.

[0050] Before the multifunctional coating in this embodiment is applied, the glass plate 1 needs to be thoroughly cleaned and the surface of the glass plate 1 needs to be kept neutral to ensure that the multifunctional coating is applied effectively. First, the base coating 2 is applied to ensure that the glass plate 1 is applied smoothly. After the base coating 2 is solidified at room temperature, the top coating 3 is applied. The top coating 3 can be applied in a direction perpendicular to the base coating 2. This coating method can make up for the subtle places that the base coating 2 has not applied to the greatest extent, and can also make up for the deficiencies of the base coating 2.

[0051] In some embodiments, the surface of the glass plate 1 in contact with the battery unit further includes a conductive layer, and the conductive layer is disposed between the base coating 2 and the glass plate 1. The design of the conductive layer can omit the metal strips connecting the battery units, and directly use the conductive layer on the glass plate 1 to output the electricity generated by the battery unit. In this embodiment, there is no specific restriction on the composition and distribution of the conductive layer, which can be selected according to actual adaptability.

[0052] Finally, the present invention provides a multifunctional coated glass for photovoltaic modules, the coated glass comprises a glass plate 1 and a multifunctional coating fixedly connected to the glass plate 1, the multifunctional coating comprises a primer 2 bonded to the surface of the glass plate 1, and a topcoat 3 attached to the primer 2; the scraping lines of the primer 2 and the topcoat 3 are perpendicular to each other; the multifunctional coating is a mixture of component A, component B and nanoparticles, component A is a curing agent, component B is a functional resin, and component A and component B are mixed in a ratio of 1:9; the functional resin is a copolymer of tetrafluoroethylene and a vinyl monomer; the nanoparticles include silicon oxide or titanium oxide; the primer 2 and the topcoat 3 on the light-receiving surface of the glass plate 1 are distributed in a grid or fully covered on the glass plate 1. The present invention improves the corrosion resistance and wear resistance of the photovoltaic glass plate 1 to acidic substances.

[0053] It should be noted that the above embodiments all belong to the same inventive concept, and the descriptions of the embodiments have different focuses. For the parts not described in detail in the individual embodiments, reference can be made to the descriptions in other embodiments. The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referred to each other.

[0054] The above embodiments only express the implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A multifunctional coated glass for photovoltaic modules, characterized in that: The coated glass comprises a glass plate (1) and a multifunctional coating fixedly connected to the glass plate (1); the multifunctional coating comprises a base coating (2) bonded to the surface of the glass plate (1), and a top coating (3) attached to the base coating (2); the scraping lines of the base coating (2) and the top coating (3) are perpendicular to each other; The multifunctional coating is formed by mixing component A, component B and nanoparticles, wherein component A is a curing agent, component B is a functional resin, and component A and component B are mixed in a ratio of 1:9; The functional resin is a copolymer of tetrafluoroethylene and vinyl monomer; the nanoparticles include silicon oxide or titanium oxide; The base coating (2) and the top coating (3) on the light-receiving surface of the glass plate (1) are distributed in a grid pattern or fully cover the glass plate (1).

2. The multifunctional coated glass for photovoltaic modules according to claim 1, characterized in that: The thickness range of the multifunctional coating is 80-120 nm.

3. The multifunctional coated glass for photovoltaic modules according to claim 2, characterized in that: The surface of the glass plate (1) in contact with the battery unit also includes a conductive layer, and the conductive layer is arranged between the base coating (2) and the glass plate (1).

4. The multifunctional coated glass for photovoltaic modules according to claim 3, characterized in that: The distribution area of ​​the grid-shaped distribution avoids the light-receiving area of ​​the battery unit.

5. The multifunctional coated glass for photovoltaic modules according to claim 1, characterized in that: The curing agent includes: one or more of an imidazole curing agent, an amine curing agent, and an isocyanate curing agent.

6. The multifunctional coated glass for photovoltaic modules according to claim 1, characterized in that: The scraping process of the multifunctional coating comprises: Use a special cleaning agent for photovoltaic glass to complete a cleaning; Use clean water to complete the secondary cleaning; Check the pH value and determine whether it is 7. If it is, proceed to the next step, otherwise proceed to the previous step. Applying a base coating (2) by scraping, and curing the base coating (2) at room temperature; The topcoat (3) is applied by knife coating.

7. The multifunctional coated glass for photovoltaic modules according to claim 6, characterized in that: The thickness ratio of the base coating (2) to the top coating (3) is 1:2.

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