Energy-increasing water-based paint for photovoltaic module and preparation method of energy-increasing water-based paint

Abstract

The invention relates to energy-increasing water-based paint for a photovoltaic module. The energy-increasing water-based paint is prepared from the following raw materials in parts by weight: 40 to 60 parts of water-based FEVE type fluorocarbon resin, 20 to 40 parts of hydroxyl acrylate emulsion, 3 to 10 parts of water-based blocked isocyanate cross-linking agent, 10 to 20 parts of silica sol, 0.5 to 2 parts of wetting flatting agent, 0.5 to 2 parts of dispersing agent, 3 to 8 parts of coalescing agent, 3 to 8 parts of thickening agent, 10 to 15 parts of filler and 10 to 20 parts of deionized water. According to the energy-increasing water-based paint for the photovoltaic module, the adhesive force of a system to a base material and the contact angle of the paint are effectively improved, and the hydrophobic self-cleaning capacity of the paint is improved.

Description

Technical Field

[0001] The present invention relates to the field of organic-inorganic hybrid functional nanomaterials, and more specifically, to an energy-enhancing water-based paint for photovoltaic modules and a preparation method thereof. Background Art

[0002] Solar energy, one of the most important renewable energy sources, is widely sought after for its safety, environmental friendliness, pollution-free nature, and inexhaustible supply. However, current solar energy conversion is far from satisfactory, leading to the global focus of scientists on improving the photovoltaic and photothermal conversion efficiency of solar panels and modules. The interfaces between air and optical components, the significant light reflection caused by smooth substrate surfaces, and dust contamination of optical modules placed outdoors can reduce the transmittance of incident sunlight, leading to lower photovoltaic and photothermal conversion efficiency. Improving the hydrophobic self-cleaning properties and the transmittance of incident sunlight are crucial for optical module protective glass exposed to long-term outdoor environments. Prior art approaches to improving the conversion efficiency of optical modules primarily utilize antireflection coatings or inorganic coatings to achieve self-cleaning and antireflection properties. However, the preparation of antireflection coatings is demanding and expensive, while inorganic coatings face challenges in durability due to their poor adhesion, leading to a decrease in photothermal conversion efficiency over time. Summary of the Invention

[0003] The object of the present invention is to provide an energy-enhancing water-based paint for photovoltaic modules and a preparation method thereof, so as to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solution: an energy-enhancing water-based paint for photovoltaic modules, the energy-enhancing paint comprising the following raw materials in parts by weight: 40-60 parts of water-based FEVE-type fluorocarbon resin, 20-40 parts of hydroxy acrylate emulsion, 3-10 parts of water-based blocked isocyanate crosslinker, 10-20 parts of silica sol, 0.5-2 parts of wetting and leveling agent, 0.5-2 parts of dispersant, 3-8 parts of film-forming aid, 3-8 parts of thickener, 10-15 parts of filler, and 10-20 parts of deionized water.

[0005] Preferably, the water-based FEVE-type fluorocarbon resin is a chlorotrifluoroethylene copolymer or a chlorotetrafluoroethylene copolymer, and the latex particle size thereof is in the range of 100-160 nm.

[0006] Preferably, the hydroxy acrylate emulsion has a latex particle size range of 80-120 nm.

[0007] Preferably, the silica sol is alkaline silica sol, and its particle size range is 30-80 nm.

[0008] Preferably, the filler is one or a combination of hydrophobic hollow SiO2 nanoparticles, mesoporous SiO2 nanoparticles, SiO2 aerogel, and gas-phase SiO2, and its particle size ranges from 5 to 60 nm.

[0009] Preferably, the thickener is one or a combination of hydroxymethyl cellulose ether and associative polyurethane.

[0010] The present invention also provides a method for preparing an energy-enhancing water-based paint for photovoltaic modules, which is characterized by comprising the following specific steps:

[0011] Step S1: mixing a water-based FEVE type fluorocarbon resin, silica sol, a wetting and leveling agent, a dispersant, a film-forming aid, a thickener, a filler, and deionized water, and fully mixing them at 1000-2500 r / min for 15-30 minutes using a high-speed disperser to obtain a water-based FEVE type fluorocarbon resin mixed solution;

[0012] Step S2: mixing the hydroxyacrylate emulsion, silica sol, wetting and leveling agent, dispersant, film-forming aid, thickener, filler, and deionized water, and fully mixing them at 1000-2500 r / min for 15-30 minutes using a high-speed disperser to obtain a hydroxyacrylate mixed solution;

[0013] Step S3: Mix the aqueous FEVE-type fluorocarbon resin mixed solution obtained in step S1 and the hydroxy acrylate mixed solution obtained in step S2, add an aqueous blocked isocyanate crosslinker, and use a high-speed disperser to fully mix at 500-1000 r / min for 15-30 minutes to obtain an energy-enhancing paint for photovoltaics.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The present invention simultaneously introduces a water-based FEVE-type fluorocarbon resin and a hydroxy acrylate emulsion organic coating of different particle sizes into an energy-enhancing water-based paint system for photovoltaic modules. Silica sols of different particle sizes and a hydrophobic SiO2 filler are further introduced into the organic coating. When the water-based paint is applied to the surface of an optical module substrate, due to the compatibility of the organic coating, the silica sol, and the different SiO2 particle sizes, phase separation occurs spontaneously on the substrate, resulting in two continuous gradient composite coating systems with different functions. In the gradient composite coating system, the water-based FEVE-type fluorocarbon resin with a larger particle size is located on the coating surface, providing good weather resistance and durability. The hydroxy acrylate emulsion located in the lower layer provides good adhesion to the substrate.

[0016] At the same time, this gradient composite coating system forms a gradient refractive index. The nanoporous structure formed by silica sols of different particle sizes and nanoporous SiO2 in the system further reduces the refractive index of the system, thereby effectively achieving the substrate's anti-reflection effect on incident light and increasing the transmittance of incident light.

[0017] In addition, in the organic coating, a water-based blocked isocyanate crosslinker is introduced on the basis of simultaneously introducing water-based FEVE-type fluorocarbon resin and hydroxy acrylate emulsion organic coatings of different particle sizes. The introduction of the water-based blocked isocyanate crosslinker increases the crosslinking density of FEVE-type fluorocarbon resin and hydroxy acrylate, further improving the durability and adhesion of the system.

[0018] Furthermore, the silica sol and hydrophobic SiO2 filler added to the system form a nanoporous structure that also enhances the hydrophobicity of the material, giving the water-based paint a certain self-cleaning ability. DETAILED DESCRIPTION

[0019] The invention discloses an energy-enhancing water-based paint for photovoltaic modules, comprising the following raw materials in parts by weight: 50 parts of water-based FEVE-type fluorocarbon resin, 30 parts of hydroxy acrylate emulsion, 8 parts of water-based blocked isocyanate crosslinking agent, 15 parts of alkaline silica sol, 0.5 parts of BYK355 wetting and leveling agent, 2 parts of D045 dispersant, 6 parts of dodecyl alcohol ester film-forming aid, 1 part of thickener hydroxymethyl cellulose ether, 3 parts of associative polyurethane thickener, 8 parts of mesoporous SiO2 nanoparticles, 6 parts of SiO2 aerogel, and 15 parts of deionized water.

[0020] Example 1

[0021] An energy-enhancing water-based paint for photovoltaic modules, comprising the following raw materials in parts by weight: 40 parts of water-based FEVE-type fluorocarbon resin, 40 parts of hydroxy acrylate emulsion, 5 parts of water-based blocked isocyanate crosslinking agent, 20 parts of alkaline silica sol, 1 part of BYK355 wetting and leveling agent, 1 part of D045 dispersant, 5 parts of lauryl ester film-forming aid, 1 part of hydroxymethyl cellulose ether thickener, 2 parts of associative polyurethane thickener, 10 parts of mesoporous SiO2 nanoparticles.

[0022] parts, 5 parts of SiO2 aerogel, and 20 parts of deionized water.

[0023] The preparation method comprises the following steps:

[0024] Step S1: Add 0.5 parts of wetting and leveling agent BYK355, 0.5 parts of dispersant D045, 0.5 parts of thickener hydroxymethyl cellulose ether, 40 parts of water-based FEVE fluorocarbon resin, 10 parts of alkaline silica sol, 5 parts of mesoporous SiO2 nanoparticles, 2.5 parts of SiO2 aerogel, 2.5 parts of film-forming aid lauryl ester, and 1 part of associative polyurethane thickener to 10 parts of water and mix thoroughly at 1500 r / min for 15 minutes.

[0025] Step S2: Add 0.5 parts of wetting and leveling agent BYK355, 0.5 parts of dispersant D045, 0.5 parts of hydroxymethyl cellulose ether, 40 parts of hydroxyacrylate emulsion, 10 parts of alkaline silica sol, 5 parts of mesoporous SiO2 nanoparticles, 2.5 parts of SiO2 aerogel, 2.5 parts of film-forming aid lauryl ester, and 1 part of associative polyurethane thickener to 10 parts of water and mix thoroughly at 1500 r / min for 15 minutes.

[0026] Step S3: Add 5 parts of a water-based blocked isocyanate crosslinker to the water-based FEVE fluorocarbon coating obtained in the above step S1 and the hydroxy acrylate coating obtained in step S2, and mix them thoroughly at 1000 r / min for 15 minutes using a high-speed disperser to obtain an energy-enhancing paint for photovoltaics.

[0027] Example 2

[0028] An energy-enhancing water-based paint for photovoltaic modules, comprising the following raw materials in parts by weight: water-based

[0029] 50 parts of FEVE type fluorocarbon resin, 30 parts of hydroxy acrylate emulsion, 8 parts of water-based blocked isocyanate crosslinker, 15 parts of alkaline silica sol, 0.5 parts of BYK355 wetting and leveling agent, 2 parts of D045 dispersant, 6 parts of dodecyl ester film-forming aid, 1 part of thickener hydroxymethyl cellulose ether, 3 parts of associative polyurethane thickener, 8 parts of mesoporous SiO2 nanoparticles, 6 parts of SiO2 aerogel, and 15 parts of deionized water.

[0030] The preparation method comprises the following steps:

[0031] Step S21: Add 0.25 parts of wetting and leveling agent BYK355, 1 part of dispersant D045, and 0.5 parts of hydroxymethyl cellulose ether to 7.5 parts of water, and further add 50 parts of water-based FEVE fluorocarbon resin, 7.5 parts of alkaline silica sol, 4 parts of mesoporous SiO2 nanoparticles, 3 parts of SiO2 aerogel, 3 parts of film-forming aid lauryl ester, and 1.5 parts of associative polyurethane thickener and mix thoroughly at 1500 r / min for 15 minutes.

[0032] Step S22: Add 0.25 parts of wetting and leveling agent BYK355, 1 part of dispersant D045, 0.5 parts of hydroxymethyl cellulose ether, 30 parts of hydroxyacrylate emulsion, 7.5 parts of alkaline silica sol, 4 parts of mesoporous SiO2 nanoparticles, 3 parts of hollow SiO2 nanoparticles, 3 parts of film-forming aid lauryl ester, and 1.5 parts of associative polyurethane thickener to 7.5 parts of water and mix thoroughly at 1500 r / min for 15 minutes.

[0033] Step S23: Add 8 parts of a water-based blocked isocyanate crosslinker to the water-based FEVE fluorocarbon coating obtained in the above step S21 and the hydroxy acrylate coating obtained in step S22, and mix them thoroughly at 1000 r / min for 15 minutes using a high-speed disperser to obtain an energy-enhancing paint for photovoltaics.

[0034] Example 3

[0035] An energy-enhancing water-based paint for photovoltaic modules, comprising the following raw materials in parts by weight: water-based

[0036] 60 parts of FEVE type fluorocarbon resin, 20 parts of hydroxy acrylate emulsion, 3 parts of water-based blocked isocyanate crosslinker, 10 parts of alkaline silica sol, 2 parts of BYK355 wetting and leveling agent, 0.5 parts of D045 dispersant, 4 parts of dodecyl ester film-forming aid, 2 parts of hydroxymethyl cellulose ether, 3 parts of associative polyurethane thickener, 5 parts of mesoporous SiO2 nanoparticles, SiO2

[0037] 5 parts of aerogel and 10 parts of deionized water.

[0038] The preparation method comprises the following steps:

[0039] Step S31: Add 1 part of wetting and leveling agent BYK355, 0.25 part of dispersant D045, 1 part of hydroxymethyl cellulose ether, 60 parts of water-based FEVE fluorocarbon resin, 5 parts of alkaline silica sol, 2.5 parts of mesoporous SiO2 nanoparticles, 2.5 parts of SiO2 aerogel, 2 parts of film-forming aid lauryl ester, and 1.5 parts of associative polyurethane thickener to 5 parts of water and rotate at 1500 r / min.

[0040] Mix thoroughly for 15 minutes.

[0041] Step S32: Add 1 part of wetting and leveling agent BYK355, 0.25 part of dispersant D045, 1 part of hydroxymethyl cellulose ether, 20 parts of hydroxy acrylate emulsion, 5 parts of alkaline silica sol, 2.5 parts of hollow SiO2 nanoparticles, 2.5 parts of SiO2 aerogel, 2 parts of film-forming aid lauryl ester, and 1.5 parts of associative polyurethane thickener to 5 parts of water and mix thoroughly at 1500 r / min for 15 minutes.

[0042] Step S33: Add 3 parts of a water-based blocked isocyanate crosslinker to the water-based FEVE fluorocarbon coating obtained in the above step S31 and the hydroxy acrylate coating obtained in step S32, and mix them thoroughly at 1000 r / min for 15 minutes using a high-speed disperser to obtain an energy-enhancing paint for photovoltaics.

[0043] Comparative Example 1

[0044] The difference between Comparative Example 1 and Example 1 is that the raw materials of the photovoltaic module energy-enhancing water-based paint do not contain hydroxy acrylate emulsion.

[0045] Comparative Example 2

[0046] The difference between Comparative Example 2 and Example 2 is that the raw materials of the photovoltaic module energy-enhancing water-based paint do not contain a water-based blocked isocyanate cross-linking agent.

[0047] Comparative Example 3

[0048] The difference between Comparative Example 3 and Example 3 is that the raw materials of the photovoltaic module energy-enhancing water-based paint do not contain filler hollow SiO2 nanoparticles and SiO2 aerogel.

[0049] For Examples 1-3 and Comparative Examples 1-3, adhesion test, 500-hour aging test, contact angle, and visible-light near-infrared spectroscopy analysis were conducted. The results are shown in Table 1.

[0050] Table 1 Experimental test results

[0051]

[0052] As shown in Table 1, the PV module energy-enhancing water-based paint prepared in this application, composed of its hydroxyl acrylate emulsion and water-based blocked isocyanate crosslinker, effectively improves the system's adhesion to the substrate. The hydrophobic SiO2 filler significantly increases the paint's contact angle, thereby enhancing its hydrophobic self-cleaning ability. These three materials synergistically enhance the maximum transmittance of the PV module energy-enhancing water-based paint.

[0053] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An energy-enhancing water-based paint for photovoltaic modules, characterized in that: The energy-enhancing paint includes the following raw materials in parts by weight: 40-60 parts of water-based FEVE fluorocarbon resin, 20-40 parts of hydroxy acrylate emulsion, 3-10 parts of water-based blocked isocyanate crosslinking agent, 10-20 parts of silica sol, 0.5-2 parts of wetting and leveling agent, 0.5-2 parts of dispersant, 3-8 parts of film-forming aid, 3-8 parts of thickener, 10-15 parts of filler, and 10-20 parts of deionized water.

2. The energy-enhancing water-based paint for photovoltaic modules according to claim 1, characterized in that: Water-based FEVE type fluorocarbon resin is a chlorotrifluoroethylene copolymer or a chlorotetrafluoroethylene copolymer, and its latex particle size range is 100-160nm.

3. The energy-enhancing water-based paint for photovoltaic modules according to claim 1, characterized in that: The hydroxy acrylate emulsion has a latex particle size range of 80-120 nm.

4. The energy-enhancing water-based paint for photovoltaic modules according to claim 1, characterized in that: The silica sol is alkaline silica sol, and its particle size range is 30-80nm.

5. The energy-enhancing water-based paint for photovoltaic modules according to claim 1, characterized in that: The filler is hydrophobic hollow SiO2 nanoparticles, mesoporous SiO2 nanoparticles, SiO2 aerogel, One or a combination of two of the gas-phase SiO2, with a particle size range of 5-60nm.

6. The energy-enhancing water-based paint for photovoltaic modules according to claim 1, characterized in that: The thickener is one or a combination of hydroxymethyl cellulose ether and associative polyurethane.

7. A method for preparing an energy-enhancing water-based paint for photovoltaic modules according to any one of claims 1 to 6, characterized in that The specific steps include: Step S1: Add water-based FEVE type fluorocarbon resin, silica sol, wetting and leveling agent, dispersant, The film-forming agent, thickener, filler and deionized water are mixed and fully mixed at 1000-2500 r / min for 15-30 minutes using a high-speed disperser to obtain a water-based FEVE type fluorocarbon resin mixed solution; Step S2: mixing the hydroxyacrylate emulsion, silica sol, wetting and leveling agent, dispersant, film-forming aid, thickener, filler, and deionized water, and fully mixing them at 1000-2500 r / min for 15-30 minutes using a high-speed disperser to obtain a hydroxyacrylate mixed solution; Step S3: Mix the aqueous FEVE type fluorocarbon resin mixed solution and the hydroxy acrylate mixed solution, add the aqueous blocked isocyanate crosslinker, and use a high-speed disperser to fully mix at 500-1000 r / min for 15-30 minutes to obtain the energy-enhancing paint for photovoltaics.

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