A highly weather-resistant and highly light-transmitting BIPV colored stone-like coating and its preparation method and application

Abstract

The present invention belongs to the field of photovoltaic building technology, and more particularly to C09D133 / 00, and more particularly to a highly weather-resistant and highly light-transmitting BIPV colored imitation stone coating, and a preparation method and application thereof. The raw materials for preparing the imitation stone coating include, by mass fraction, 25-60 parts of fluorinated hydroxyl acrylic emulsion, 10-60 parts of deionized water, 5-10 parts of polyols, 1-5 parts of dispersants, 0.1-2 parts of cellulose, 0.1-0.3 parts of pH regulators, 0.1-0.6 parts of defoamers, 2-5 parts of powders, 0.3-0.5 parts of preservatives, 1-5 parts of film-forming aids, 5-10 parts of protective glue solutions, and 0.1-2 parts of structural color pigments. The imitation stone coating has excellent weather resistance, and has a higher light transmittance, and can also cover the color difference of the battery sheet and backplane color and busbar inside the photovoltaic module, and the coating surface shows the same effect as stone, which is more in line with the aesthetic needs of the building and has excellent practical application effects.

Description

Technical Field

[0001] The present invention belongs to the field of photovoltaic building technology, and in particular to C09D133 / 00, and more particularly to a highly weather-resistant and highly light-transmitting BIPV colored stone-like paint, and a preparation method and application thereof. Background Art

[0002] Although China's photovoltaic industry has been at the forefront of the world, the development of building integrated photovoltaics (BIPV) has not kept pace, mainly because the aesthetic requirements of buildings are very high, higher than the power generation properties of photovoltaic modules. How to maintain the high power generation efficiency of photovoltaic modules and the safe and beautiful integration of photovoltaic modules into buildings is a technical issue. The development of beautiful and efficient solar photovoltaic modules integrated with buildings, presenting architectural beauty while giving power generation functions has received the focus of attention from all parties in recent years, and the national government has also introduced many BIPV support policies.

[0003] Most common building photovoltaic integration modules are based on thin-film solar cells (cadmium telluride, copper indium gallium selenide, perovskite). First, colored solar cells are prepared, connected in series and parallel, and then pressed into monochrome modules through transparent adhesive films. The materials of building photovoltaic integration are mostly double-glass substrates (both the front and rear panels are glass). This structure meets the safety characteristics of building glass curtain walls, outdoor durability, and easy installation. In recent years, building photovoltaic integration has also been achieved by painting the cover glass of the module, but pure monochrome is difficult to cover the color difference of the battery cells, back panel color, and busbars inside the module. While improving the covering power, it will sharply reduce the transmittance. For this reason, we have developed a highly weather-resistant and high-transmittance colored imitation stone coating that can effectively use the color of the battery cells as the background color, and can effectively cover the color difference inside the module, showing the same effect as stone, which is more in line with the aesthetic needs of the building.

[0004] The prior art is that the patent CN114854306A discloses a reflective coating, the raw materials of which include 30-45 parts of water-based polymer emulsion, 15-30 parts of water, 10-20 parts of pigments and fillers, 20-35 parts of reflective materials and 4-8 parts of additives. The reflectivity of the reflective layer to visible light reaches more than 85%, which effectively improves the reflectivity of the backboard, thereby increasing the amount of reflected light received by the back of the double-sided photovoltaic module including the backboard. However, the conventional acrylic polymer emulsion does not significantly improve the weather resistance of the product, and yellowing may occur after being used on the photovoltaic module. In addition, the choice of pigment also has a great influence on the light transmittance of the coating. Summary of the invention

[0005] The first aspect of the present invention provides a highly weather-resistant and highly light-transmittant BIPV colored stone-like paint, the raw materials for its preparation comprising, by weight: 25-60 parts of fluorine-containing hydroxyl acrylic emulsion, 10-60 parts of deionized water, 5-10 parts of polyol, 1-5 parts of dispersant, 0.1-2 parts of cellulose, 1-5 parts of film-forming aid, 0.1-0.3 parts of pH regulator, 0.1-0.6 parts of defoaming agent, 2-5 parts of powder, 0.3-0.5 parts of preservative, 5-10 parts of protective glue solution, and 0.1-2 parts of structural color pigment.

[0006] Preferably, the average molecular weight of the fluorine-containing hydroxyl acrylic emulsion is 10,000-50,000, the fluorine content is not less than 10%, and the hydroxyl content is not less than 1%.

[0007] Further preferably, the average molecular weight of the fluorine-containing hydroxyl acrylic emulsion is 13000-25000, the fluorine content is not less than 13%, and the hydroxyl content is not less than 1.8%; as an implementable case, the model of the fluorine-containing hydroxyl acrylic emulsion can be ZT-9608 or ZT-9632, purchased from Changshu Zhitai.

[0008] Preferably, the polyol includes one or more of ethylene glycol, 1,2-propylene glycol, glycerol, 1,4-butanediol, neopentyl glycol, diethylene glycol, and trimethylolpropane.

[0009] More preferably, the polyol includes 1,2-propylene glycol.

[0010] Preferably, the cellulose includes one or more of ethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxypropyl methyl cellulose and ascidian cellulose.

[0011] Further preferably, the cellulose comprises hydroxyethyl cellulose.

[0012] Further preferably, the hydroxyethyl cellulose includes hydrophobically modified hydroxyethyl cellulose and high molecular weight hydroxyethyl cellulose.

[0013] More preferably, the mass ratio of the hydrophobically modified hydroxyethyl cellulose to the high molecular weight hydroxyethyl cellulose is (1-5):(2-10).

[0014] Preferably, the average molecular weight of the high molecular weight hydroxyethyl cellulose is 50,000-150,000.

[0015] More preferably, the average molecular weight of the high molecular weight hydroxyethyl cellulose is 100,000; as an implementable case, the high molecular weight hydroxyethyl cellulose may be German Shin-Etsu HS100000YP2.

[0016] Preferably, the viscosity of the hydrophobically modified hydroxyethyl cellulose is greater than 5000 cps at 25°C.

[0017] More preferably, the viscosity of the hydrophobically modified hydroxyethyl cellulose is 9000-16000 cps at 25° C.; as an implementable case, the hydrophobically modified hydroxyethyl cellulose may be Natrosol HE10K produced by Ashland Cellulose of the United States.

[0018] Preferably, the dispersant includes one or more of sodium polycarboxylate, polyethylene glycol, modified polyurethane, and lignin.

[0019] Further preferably, the dispersant includes sodium polycarboxylate. As an implementable case, the dispersant may be SN5040 from Japan Nopco.

[0020] The present invention does not further limit the type of pH adjuster, and any substance that can play a role in pH adjustment can be used, including but not limited to 2-amino-2-methyl-1-propanol.

[0021] The film-forming aid is selected from at least one of alcohols, alcohol esters, alcohol ethers and alcohol ether esters.

[0022] More preferably, the film-forming aid includes alcohol esters. As an practicable example, the alcohol ester includes dodecyl alcohol ester, which may be Eastman TEXANOL ester alcohol.

[0023] Preferably, the powder comprises kaolin, calcium carbonate, barium sulfate, zinc oxide, titanium dioxide, and has a particle size of 1000-4000 mesh.

[0024] Preferably, the preparation raw materials further include: one or more of a silane coupling agent, a defoaming agent, and a preservative.

[0025] Preferably, the silane coupling agent includes but is not limited to Momentive silane coupling agent A-187.

[0026] Preferably, the structural color pigment includes one or more of KC9504-SW, KC820-SW, KC9215-SW, KC1303Z-SW, KC4303Z-SW, KC9835C-SW, KC9300-SW, and KC4303Z-SW, which can be purchased from Kuncai Technology.

[0027] The second aspect of the present invention provides a method for preparing a highly weather-resistant and highly light-transmitting BIPV colored stone-like coating, comprising the following steps:

[0028] S1. Preparation of base paint: deionized water, polyol, defoamer, cellulose are added to a stirring tank, pH regulator, dispersant, powder, film-forming aid, preservative, protective glue solution are added during high-speed stirring, and stirred at high speed for 30-90 minutes, and the material fineness is controlled to be below 40 μm to obtain a base paint;

[0029] S2. Color matching: Add structural color pigments to the base paint to achieve stone-like effect color matching, and control the light transmittance of the 400μm color point to be no less than 65%;

[0030] S3, Cutting point granulation: Use high-precision digital display speed agitator for cutting point granulation to ensure the consistency and reproducibility of batch color dots;

[0031] S4. Preparation of continuous phase: Add fluorinated hydroxyl acrylic emulsion and silane coupling agent, and stir at medium speed for 1-2 hours.

[0032] The third aspect of the present invention provides an application of a highly weather-resistant and highly light-transmittant BIPV colored stone-like paint, which is applied to photovoltaic modules. The application steps include: evenly spraying the highly weather-resistant and highly light-transmittant BIPV colored stone-like paint onto the photovoltaic glass cover plate, and drying and curing at 120-200°C for 15-45 minutes. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic diagram of the structure of the highly weather-resistant and highly light-transmitting BIPV colored stone-like coating prepared in Example 1.

[0034] Figure 2 This is a real-life rendering of the highly weather-resistant and highly light-transmittance BIPV colored stone-like paint prepared in Example 1.

[0035] Figure 3 The weather resistance effect diagram of the highly weather-resistant and highly light-transmittance BIPV colored stone-like coating prepared in Example 1 and Comparative Example 1, wherein serial number 1 refers to Comparative Example 1, and serial number 2 refers to Example 1.

[0036] Figure 4 Schematic diagram of the difference in light transmittance of the highly weather-resistant and highly light-transmittant BIPV colored stone-like coatings prepared in Example 1 and Comparative Example 2.

[0037] Beneficial Effects

[0038] (I) The present invention selects a specific fluorinated hydroxyl acrylic emulsion, specifically a fluorinated hydroxyl acrylic emulsion with an average molecular weight of 13000-25000, a fluorine content of not less than 13%, and a hydroxyl content of not less than 1.8%, which can effectively improve the weather resistance and adhesion performance of the high weather resistance and high light transmittance BIPV color stone-like coating. After DH1000 / UV 60KWH.m 2After the aging test, the product hardly turns yellow. The inventors speculate that the fluorinated hydroxyl acrylic emulsion is formed by graft copolymerization of acrylate monomers, special hydroxyl monomers and organic fluorine monomers. Its C-F bond energy is very strong, and the alternating structural units of the fluorocarbon resin structure protect the easily oxidized olefinic structural units. Therefore, the stone-like coating has excellent UV aging resistance.

[0039] (ii) The fluorine-containing hydroxyl acrylic emulsion in the present invention can also form a dense cross-linked network structure with the hydrophobically modified hydroxyethyl cellulose and high molecular weight hydroxyethyl cellulose in the system, and can firmly adhere to the surface of the photovoltaic device. The prepared coating film has excellent adhesion and excellent chemical stability, and its chemical bonds will not be oxidized and cracked by free radicals in the air. Even without the addition of antioxidants and anti-UV agents, it can still have excellent weather resistance. If a conventional fluorine-free hydroxyl acrylic emulsion is selected, the weather resistance of the imitation stone coating will be significantly reduced, and yellowing will occur after being left at room temperature for a long time.

[0040] (III) In the present invention, a compound of hydrophobically modified hydroxyethyl cellulose and high molecular weight hydroxyethyl cellulose in a mass fraction ratio of (1-5): (2-10) is selected as a thickener for the stone-like coating, which can effectively improve the adhesion. In addition, the thickener of the compound of hydrophobically modified hydroxyethyl cellulose and high molecular weight hydroxyethyl cellulose can also cooperate with structural color pigments and fluorinated hydroxyl acrylic emulsions, which can not only improve the hydrophobicity of the stone-like coating, but also improve the weather resistance and color retention of the coating.

[0041] (IV) The present invention selects specific structural color pigments, which can not only effectively protect the surface of photovoltaic modules and improve their weather resistance, but also can work together with dispersants, thickeners, and polyols to make the fluorinated hydroxyl acrylic emulsion and cellulose more evenly dispersed in the preparation system. More importantly, the specific structural color pigments will not have a significant effect on the light transmittance of the photovoltaic peeling cover sprayed with stone-like paint. The light transmittance at a wavelength of 350-1100nm can reach more than 75%, so that the photovoltaic modules can efficiently utilize light energy, thereby achieving a higher photoelectric conversion efficiency. If the commonly used colored metal oxide raw materials on the market are used, the raw materials will be unevenly dispersed, and the light transmittance of the stone-like paint will be significantly affected, which will cause a decrease in energy conversion efficiency after actual application.

[0042] (V) The highly weather-resistant and highly light-transmittance BIPV colored imitation stone coating obtained by the present invention has a simple preparation method, which can not only effectively improve the weather resistance of photovoltaic modules, but also cover the color difference of the battery cells, back panel colors and bus bars inside the photovoltaic modules, while improving the covering power without significantly reducing the light transmittance. The surface of the auxiliary material coating shows the same effect as stone, which is more in line with the aesthetic requirements of the building and has excellent practical application effects. DETAILED DESCRIPTION

[0043] Example 1

[0044] The first aspect of the present embodiment provides a highly weather-resistant and highly light-transmitting BIPV colored imitation stone coating, the raw materials for its preparation are calculated by weight as follows: 30 parts of fluorinated hydroxyl acrylic emulsion (model ZT-9608, purchased from Jiangsu Zhitai Technology Development Co., Ltd.), 50 parts of deionized water, 5.5 parts of propylene glycol (purchased from Dow, USA), 1.5 parts of film-forming aid (model: Eastman TEXANOL ester alcohol), 0.35 parts of hydrophobically modified hydroxyethyl cellulose (model: American Ashland Cellulose Natrosol HE10K), 0.85 parts of high molecular weight hydroxyethyl cellulose (model: Germany Shin-Etsu HS100000YP2), 0.2 parts of pH adjuster (model: American Dow AMP-95), 0.2 parts of dispersant (model: Japan Nopco sn5040), 0.2 parts of defoamer (model: BASF FoamStarST2410), 7.5 parts of calcined kaolin (model: Shanxi Jufeng 1250 mesh), 0.3 parts of antiseptic benzoisothiazolinone fungicide (purchased from Wenke Chemical), 5 parts of 6wt% protective glue solution (made by adding deionized high-speed dispersion of Changshu Zhitai Technology ZT-535 protective glue powder), 2 parts of structural color pigment (model: Kuncai Technology KC9504-SW, Kuncai Technology KC1303Z-SW, Kuncai Technology KC9300-SW, the mass ratio of the three components is 1:1:1), and 2 parts of silane coupling agent (Maitu silane coupling agent A-187).

[0045] The second aspect of the present embodiment provides a method for preparing a highly weather-resistant and highly light-transmitting BIPV colored stone-like coating, which specifically comprises the following steps:

[0046] S1. Preparation of base paint: deionized water, polyol, defoamer, hydrophobically modified hydroxyethyl cellulose, high molecular weight hydroxyethyl cellulose were added into a stirring tank, pH regulator, dispersant, film-forming aid, powder, preservative, protective glue solution were added under high-speed stirring at 1000 rpm, and the mixture was stirred at 1000 rpm for 60 min, and the material fineness was controlled to be below 40 μm to obtain base paint;

[0047] S2. Color matching: Add structural color pigments to the base paint to achieve stone-like effect color matching, and control the light transmittance of the 400μm color point to be no less than 65%;

[0048] S3, Cutting point granulation: Use high-precision digital display speed agitator for cutting point granulation to ensure the consistency and reproducibility of batch color dots;

[0049] S4. Preparation of continuous phase: adding fluorinated hydroxyl acrylic emulsion and silane coupling agent, stirring at a medium speed of 600 rpm for 1 hour.

[0050] The third aspect of the present invention provides an application of a highly weather-resistant and highly light-transmittant BIPV colored stone-like paint, which is applied to photovoltaic modules. The application steps include: evenly spraying the highly weather-resistant and highly light-transmittant BIPV colored stone-like paint onto the photovoltaic glass cover plate, and drying and curing at 180°C for 30 minutes.

[0051] The structural schematic diagram of the highly weather-resistant and highly light-transmitting BIPV colored stone-like coating prepared in this embodiment is shown in FIG. Figure 1 shown.

[0052] The actual effect picture of the highly weather-resistant and highly light-transmitting BIPV colored stone-like coating prepared in this embodiment is as follows: Figure 2 shown.

[0053] The weather resistance effect diagram of the highly weather-resistant and highly light-transmitting BIPV colored imitation stone coating prepared in this embodiment and comparative example 1 is as follows: Figure 3 As shown, wherein serial number 1 is comparative example 1, and serial number 2 is embodiment 1.

[0054] The schematic diagram of the difference in light transmittance of the highly weather-resistant and highly light-transmitting BIPV colored stone-like coatings prepared in this embodiment and comparative example 2 is shown in FIG. Figure 4 shown.

[0055] Example 2

[0056] The first aspect of the present embodiment provides a highly weather-resistant and highly light-transmitting BIPV colored imitation stone coating, the raw materials for its preparation are calculated by weight: 55 parts of fluorinated hydroxyl acrylic emulsion (model ZT-9632, purchased from Jiangsu Zhitai Technology Development Co., Ltd.), 40 parts of deionized water, 5.5 parts of propylene glycol (purchased from Dow, USA), 1.5 parts of film-forming aid (model: Eastman TEXANOL ester alcohol), 0.25 parts of hydrophobically modified hydroxyethyl cellulose (model: American Ashland Cellulose Natrosol HE10K), 0.85 parts of high molecular weight hydroxyethyl cellulose (model: German Shin-Etsu HS100000YP2), 0.2 parts of pH regulator (model: American Dow AMP-95), 0.2 parts of dispersant (model: Japan Nopco sn5040), 0.2 parts of defoaming agent (model: BASF FoamStar ST2410), 7.5 parts of calcined kaolin (model: Shanxi Jufeng 1250 mesh), 0.3 parts of preservative benzisothiazolinone fungicide (purchased from Wenke Chemical), 5 parts of 6wt% protective glue solution (made by adding deionized high-speed dispersion of Changshu Zhitai Technology ZT-535 protective glue powder), 2 parts of structural color pigment (model: Kuncai Technology KC9504-SW), 2 parts of silane coupling agent (model: Maitu silane coupling agent A-187).

[0057] The second aspect of the present embodiment provides a method for preparing a highly weather-resistant and highly light-transmitting BIPV colored stone-like coating, which specifically comprises the following steps:

[0058] S1. Preparation of base paint: deionized water, polyol, defoamer, hydrophobically modified hydroxyethyl cellulose, high molecular weight hydroxyethyl cellulose were added into a stirring tank, pH regulator, dispersant, powder, preservative, film-forming aid, protective glue solution were added under high-speed stirring at 1000 rpm, and the mixture was stirred at 1000 rpm for 60 min, and the material fineness was controlled to be below 40 μm to obtain base paint;

[0059] S2. Color matching: Add structural color pigments to the base paint to achieve stone-like effect color matching, and control the light transmittance of the 400μm color point to be no less than 65%;

[0060] S3, Cutting point granulation: Use high-precision digital display speed agitator for cutting point granulation to ensure the consistency and reproducibility of batch color dots;

[0061] S4. Preparation of continuous phase: adding fluorinated hydroxyl acrylic emulsion and silane coupling agent, stirring at a medium speed of 600 rpm for 1 hour.

[0062] Example 3

[0063] The first aspect of the present embodiment provides a highly weather-resistant and highly light-transmitting BIPV colored imitation stone coating, the raw materials for its preparation are calculated by weight: 25 parts of fluorinated hydroxyl acrylic emulsion (model ZT-9608, purchased from Jiangsu Zhitai Technology Development Co., Ltd.), 50 parts of deionized water, 5.5 parts of propylene glycol (purchased from Dow, USA), 1.5 parts of film-forming aid (model: Eastman TEXANOL ester alcohol), 0.4 parts of hydrophobically modified hydroxyethyl cellulose (model: American Ashland Cellulose Natrosol HE10K), 0.9 parts of high molecular weight hydroxyethyl cellulose (model: German Shin-Etsu HS100000YP2), 0.2 parts of pH regulator (model: American Dow AMP-95), 0.2 parts of dispersant (model: Japan Nopco sn5040), 0.2 parts of defoaming agent (model: BASF FoamStar ST2410), 7.5 parts of calcined kaolin (model: Shanxi Jufeng 1250 mesh), 0.3 parts of preservative benzisothiazolinone fungicide (purchased from Wenke Chemical), 5 parts of 6wt% protective glue solution (made by adding deionized high-speed dispersion of Changshu Zhitai Technology ZT-535 protective glue powder), 2 parts of structural color pigment (model: Kuncai Technology KC1303Z-SW), 2 parts of silane coupling agent (model: Maitu silane coupling agent A-187).

[0064] The second aspect of the present embodiment provides a method for preparing a highly weather-resistant and highly light-transmitting BIPV colored stone-like coating, which specifically comprises the following steps:

[0065] S1. Preparation of base paint: deionized water, polyol, defoamer, hydrophobically modified hydroxyethyl cellulose, high molecular weight hydroxyethyl cellulose were added into a stirring tank, pH regulator, dispersant, powder, preservative, protective glue solution were added under high-speed stirring at 1000 rpm, and the mixture was stirred at 1000 rpm for 60 min, and the material fineness was controlled to be below 40 μm to obtain base paint;

[0066] S2. Color matching: Add structural color pigments to the base paint to achieve stone-like effect color matching, and control the light transmittance of the 400μm color point to be no less than 65%;

[0067] S3, Cutting point granulation: Use high-precision digital display speed agitator for cutting point granulation to ensure the consistency and reproducibility of batch color dots;

[0068] S4. Preparation of continuous phase: adding fluorinated hydroxyl acrylic emulsion and silane coupling agent, stirring at a medium speed of 600 rpm for 1 hour.

[0069] Comparative Example 1

[0070] The specific implementation of this comparative example is the same as that of Example 1, except that the preparation raw material does not include fluorinated hydroxyl acrylic emulsion, but is replaced by an equal amount of pure acrylic emulsion (model: ZT-8110 of Jiangsu Zhitai Technology Development Co., Ltd.).

[0071] Comparative Example 2

[0072] The specific implementation manner of this comparative example is the same as that of Example 1, except that the structural color pigments are: iron red SM8811Y, carbon black SM6800Y, and iron yellow SM8810Y, the mass ratio of the three components is 1:1:1, and they are purchased from Suzhou Shiming Technology Co., Ltd.

[0073] Performance Testing

[0074] Test object: coatings obtained in Examples 1-3

[0075] 1. IEC 61215 test items and results:

[0076] 1. PCT test (high voltage accelerated aging life test): components have no abnormalities for 96 hours;

[0077] 2. Colored stone-like coating transmittance: 350nm-1100nm average transmittance ≥75%;

[0078] 3. Module weathering aging test: UV 60kWh·m 2 Yellowing index ΔY≤4, no change in appearance, and attenuation rate less than <0.5%.

[0079] 4. Adhesion test: Dry adhesion: 0 level by cross-cut method; Wet adhesion (PCT 48 hours - boiling water): no bulging, no falling off, 0 level by cross-cut method.

[0080] 5. Peel strength between colored imitation stone coating and adhesive film: ≥60N / cm.

[0081] 6. The CTM value of the imitation stone component is greater than 80%.

[0082] 2. Test object: coating obtained in comparative example 1

[0083] Module weathering aging test: UV 60kWh·m 2 Yellowing index ΔY ≥ 4, the appearance turns yellow.

[0084] 3. Test object: Test data of the coatings obtained in Example 1 and Comparative Example 2 after application to BIPV photovoltaic modules

[0085] Test content: light transmission performance, test results are shown in Table 1

[0086] Table 1

[0087]

[0088]

Claims

1. A highly weather-resistant and highly light-transmitting BIPV colored stone-like paint, characterized in that: The raw materials for preparation include, by weight: 25-60 parts of fluorine-containing hydroxyl acrylic emulsion, 10-60 parts of deionized water, 5-10 parts of polyol, 1-5 parts of dispersant, 0.1-2 parts of cellulose, 1-5 parts of film-forming aid, 0.1-0.3 parts of pH regulator, 0.1-0.6 parts of defoamer, 2-5 parts of powder, 0.3-0.5 parts of preservative, 5-10 parts of protective glue solution, and 0.1-2 parts of structural color pigment; The relative molecular weight of the fluorine-containing hydroxyl acrylic emulsion is 10000-50000, the fluorine content is not less than 10%, and the hydroxyl content is not less than 1%; The cellulose includes hydroxyethyl cellulose; The hydroxyethyl cellulose includes hydrophobically modified hydroxyethyl cellulose and high molecular weight hydroxyethyl cellulose; The mass ratio of the hydrophobically modified hydroxyethyl cellulose and the high molecular weight hydroxyethyl cellulose is (1-5): (2-10); The relative molecular weight of the high molecular weight hydroxyethyl cellulose is 50000-150000; The viscosity of the hydrophobically modified hydroxyethyl cellulose is greater than 5000 cps at 25°C.

2. The highly weather-resistant and highly light-transmitting BIPV colored stone-like paint according to claim 1, characterized in that: The preparation raw materials also include: one or more of a silane coupling agent, a defoaming agent, and a preservative.

3. A method for preparing the highly weather-resistant and highly light-transmitting BIPV colored stone-like coating according to claim 2, characterized in that: The following steps are involved: S1. Preparation of base paint: deionized water, polyol, defoamer, cellulose are added to a stirring tank, pH regulator, dispersant, powder, film-forming aid, preservative, protective glue solution are added during high-speed stirring, and the mixture is stirred at high speed for 30-90 minutes, and the material fineness is controlled to be below 40 μm to obtain a base paint; S2. Color matching: Add structural color pigments to the base paint to achieve stone-like effect color matching, and control the light transmittance of the 400μm color point to be no less than 65%; S3, Cutting point granulation: Use high-precision digital display speed agitator for cutting point granulation to ensure the consistency and reproducibility of batch color dots; S4. Preparation of continuous phase: Add fluorinated hydroxyl acrylic emulsion and silane coupling agent, and stir at medium speed for 1-2 hours.

4. An application of the highly weather-resistant and highly light-transmitting BIPV colored stone-like paint according to claim 2, characterized in that: Applied on photovoltaic modules, the application steps include: evenly spraying the highly weather-resistant and highly light-transmitting BIPV colored imitation stone paint onto the photovoltaic glass cover, and drying and curing at 120-200°C for 15-45 minutes.

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