Solar insulation backboard and preparation method thereof

Abstract

The invention relates to the technical field of solar cell panels, and discloses a solar insulation backboard and a preparation method thereof.The solar insulation backboard comprises a base material layer, an EB layer, a thin film layer and a protection layer, the EB layer is a polymer coating layer obtained after radiation curing through the EB curing technology, and the EB layer and the thin film layer are compounded through a bonding layer. The polymer coating layer is obtained through the EB curing technology, then the polymer coating layer is compounded with the bonding layer, the thin film layer and the protective layer to form the solar insulation backboard, and the obtained solar insulation backboard has excellent mechanical strength, electrical insulation performance, lightweight characteristic, sustainability and environmental protection performance, and is simple in structure, relatively low in preparation cost and suitable for popularization and application. The invention is suitable for solar panels and other fields.

Description

Technical Field

[0001] The present invention relates to the technical field of solar cell panels, and in particular to a solar cell insulating back panel and a preparation method thereof. Background Art

[0002] A solar panel is a photoelectric semiconductor sheet that uses sunlight to directly generate electricity. The backplane, as a very important part of the solar panel assembly, needs to provide mechanical support and electrical insulation to protect the internal circuits and devices, thereby achieving solar energy conversion. In addition, the solar backplane, as the outer layer material on the back of the solar cell, needs to have good weather resistance so that the assembly can operate outdoors for a long time.

[0003] At present, traditional solar backsheets have some limitations in terms of durability and weight. The traditional backsheet materials mainly improve the weather resistance, corrosion resistance, hardness and adhesion of the backsheet by adding fluorine-containing coatings, thereby increasing its service life. However, these fluorine-containing coatings often contain halogen elements, and the recycling and treatment of the backsheets is difficult. Conventional landfill and incineration methods will cause serious environmental pollution. In addition, solar backsheets need to be lightweight to reduce the weight of the solar panel itself. In order to take into account multiple performance requirements, conventional solar backsheets are mostly designed with a multi-layer structure, which increases the thickness of the backsheet and reduces production efficiency. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a solar insulating back sheet and a preparation method thereof. The solar back sheet in the present invention has excellent mechanical strength, electrical insulation performance and light weight, and is environmentally friendly and has a simple structure.

[0005] In order to solve the above technical problems, the first aspect of the present invention provides a solar insulation backplane, including a substrate layer, an EB layer, a film layer and a protective layer, wherein the EB layer is a polymer coating layer obtained by radiation curing through EB (electron beam) curing technology, and the EB layer and the film layer are composited through an adhesive layer.

[0006] As an improvement of the above solution, the thickness of the EB layer is 20 to 100 μm.

[0007] As an improvement of the above scheme, the voltage of the EB radiation curing is 100-150 kV, the irradiation dose is 20 KGy-100 kGy, and the oxygen content is 80-600 ppm.

[0008] As an improvement of the above solution, a reflective structure is provided on the EB layer, and the reflective structure is a grating pattern.

[0009] As an improvement of the above solution, the width of the grating pattern is 3 to 70 μm, and the spacing between two adjacent grating patterns is 5 to 90 μm;

[0010] The method for preparing the grating pattern is as follows: the grating pattern is prepared on the EB layer by adopting an embossing technology.

[0011] As an improvement of the above solution, the polymer coating adopts a coating process, and the coating process is direct coating, in which the polymer coating is directly coated on the surface of the substrate layer, and then radiation cured by EB curing technology.

[0012] As an improvement of the above scheme, the polymer coating is a fluorine-free polymer coating, and the raw materials for preparing the polymer coating include, by weight: 30 to 90 parts of prepolymer, 10 to 40 parts of active diluent and 0.1 to 15 parts of auxiliary agent, wherein the prepolymer is selected from one or more of epoxy acrylate, polyurethane acrylate, polyester acrylate, polyacrylate, and polyether acrylate.

[0013] As an improvement of the above solution, the adhesive layer is one or more of a polyester coating and a polyurethane coating, and the thickness of the adhesive layer is 1 to 2 μm.

[0014] The substrate layer is made of one or more of PET and PUE, and the thickness of the substrate layer is 50 to 300 μm;

[0015] The film layer is made of PET (polyethylene terephthalate), and the thickness of the film layer is 250-350 μm;

[0016] The protective layer is made of polyester material, and the thickness of the protective layer is 20-50 μm.

[0017] The second aspect of the present invention also provides a method for preparing the solar insulating back sheet, comprising:

[0018] (1) preparing a film layer, and respectively providing an adhesive layer and a protective layer on both sides of the film layer;

[0019] (2) preparing a polymer coating in the EB layer, applying it to the surface of the substrate layer, curing it by electron beam, and setting a grating pattern;

[0020] (3) Compounding the EB layer obtained in (2) with the adhesive layer to obtain a solar insulation back sheet.

[0021] The implementation of the present invention has the following beneficial effects:

[0022] In the present invention, a polymer coating layer is obtained on the surface of the substrate layer by EB curing technology, and then a solar insulating backboard is formed by compounding the adhesive layer, the film layer and the protective layer. The obtained solar insulating backboard has excellent mechanical strength, electrical insulation performance, light weight, sustainability and environmental protection, and has a simple structure and relatively low preparation cost, and is suitable for fields such as solar panels. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 : A schematic structural diagram of a solar insulating backplane in the present invention;

[0024] Figure 2 : A schematic structural diagram of the reflective structure in the present invention.

[0025] Description of the drawings: 1-substrate layer; 2-EB layer; 21-reflective structure; 3-adhesive layer; 4-film layer; 5-protective layer. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail with specific embodiments below.

[0027] To solve the above problems, Figure 1 As shown, the first aspect of the present invention provides a solar insulation back panel, including a substrate layer 1, an EB layer 2, a film layer 4 and a protective layer 5, wherein the EB layer 2 is a polymer layer obtained by radiation curing a polymer coating through an EB curing technology, and the EB layer 2 and the film layer 4 are compounded by an adhesive layer 3.

[0028] In the present invention, the EB layer 2 is prepared on the substrate layer 1 using EB curing technology, which can increase the hardness and mechanical strength of the solar insulation backplane, and also has certain corrosion resistance and thermal stability, and can maintain stability in a high temperature environment, so that the backplane has better durability and higher work efficiency. It is compounded with the film layer, combined with the setting of the protective layer, to achieve protection of the film layer, improve the electrical insulation performance of the solar backplane, improve the water resistance, stability, weather resistance, etc. of the backplane, and can adapt to various environmental conditions. However, when the EB layer 2 is compounded with other layer materials, there is a problem of poor adhesion, which easily leads to interlayer peeling or poor bonding performance. Therefore, the EB layer 2 and the film layer 4 are compounded by the adhesive layer 3 to improve the adhesion between the EB layer and the film layer.

[0029] In addition, when the front solar cell module fails, the solar insulation back sheet obtained in the present invention can continue to receive solar radiation as the front side and continue to perform photoelectric conversion.

[0030] The material of the substrate layer 1 in the present invention is a conventional substrate layer material used for solar back panels. Preferably, the substrate layer 1 is a layer made of one or more of PET or PUE, and the thickness of the substrate layer 1 is 50 to 300 μm.

[0031] Preferably, the polymer coating is applied by a coating process, which may be a conventional method such as direct coating, spraying, roller coating, or scraping. In the present invention, the polymer coating is applied by direct coating, and the polymer coating is directly applied to the surface of the substrate layer, and then radiation curing is performed by EB curing technology, which can effectively avoid delamination or peeling of the EB layer on the substrate layer, improve the yield, and reduce the backplane composite process and save costs.

[0032] Preferably, the polymer coating is a fluorine-free polymer coating. In the present invention, a fluorine-free oligomer is selected to ensure the environmental friendliness of the backplane. At the same time, combined with the use of EB curing technology, the backplane can also have good mechanical strength and weather resistance, and avoid the use of photoinitiators, thereby avoiding the problems of oxidation yellowing and poor stability of the coating. The raw materials for preparing the polymer coating include, by weight: 30 to 90 parts of prepolymer, 10 to 40 parts of active diluent and 0.5 to 15 parts of auxiliary agent. The obtained polymer coating has high tensile strength, heat resistance and weather resistance.

[0033] Furthermore, the prepolymer is an oligomer containing double bonds, and the prepolymer is selected from one or more of epoxy acrylate, polyurethane acrylate, polyester acrylate, polyacrylate, and polyether acrylate.

[0034] Furthermore, the reactive diluent is an acrylate monomer containing a double bond, and the acrylate monomer includes a monofunctional acrylate monomer, a difunctional acrylate monomer, and a multifunctional acrylate monomer. Examples of the monofunctional acrylate monomer include hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxybutyl acrylate, hydroxyethyl methacrylate, hydroxypropyl methacrylate, hydroxybutyl methacrylate, isobornyl acrylate, isobornyl methacrylate, etc.; examples of the difunctional acrylate monomer include neopentyl glycol diacrylate, hexanediol diacrylate, dipropylene glycol diacrylate, tripropylene glycol diacrylate, tripropylene glycol dimethacrylate, diethylene glycol diacrylate, triethylene glycol dimethacrylate, 1,4-butanediol dimethacrylate, , neopentyl glycol dimethacrylate, neopentyl glycol dipropoxy diacrylate, neopentyl glycol dipropoxy dimethacrylate, 2-methyl-1,3-propanediol diacrylate, etc.; the multifunctional acrylate monomers include trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, pentaerythritol triacrylate, pentaerythritol trimethacrylate, dipentaerythritol hexaacrylate, propoxylated trimethylolpropane trimethacrylate, propoxylated glycerol triacrylate, propoxylated glycerol trimethacrylate, triallyl triisocyanate, trimethylallyl triisocyanate, etc.

[0035] Furthermore, the auxiliary agents include but are not limited to dispersants, leveling agents, defoamers, antioxidants, adhesion promoters, heat stabilizers, fillers, and pigments.

[0036] In some preferred embodiments, the dispersant is a dispersant commonly used in the art, including but not limited to N,N'-ethylenebisstearamide, EFKA-4560, BYK-110, BYK-111, BYK-112, BYK-116. The leveling agent includes but is not limited to BYK-350, BYK331, BYK333, AFCONA3034. The defoamer is a defoamer commonly used in the art, including but not limited to BYK-1790, BYK052, BYK055, AFCONA2022. The antioxidant includes but is not limited to 1010. The adhesion promoter includes but is not limited to silane coupling agent, titanate silane coupling agent, Dow Corning 6030, FM135. The heat stabilizer is a heat stabilizer commonly used in the art, including but not limited to rare earth / calcium / zinc composite heat stabilizer, dibutyltin dilaurate, zinc stearate, aluminum stearate, aluminum distearate. The filler includes but is not limited to inorganic particles that absorb ultraviolet rays.

[0037] Preferably, the voltage of the EB radiation curing is 100-150 kV, exemplary of which is 100 kV, 110 kV, 120 kV, 130 kV, 140 kV, and 150 kV, but not limited thereto; the dosage is 20 KGy-100 kGy, exemplary of which is 20 KGy, 30 KGy, 40 KGy, 50 KGy, 60 KGy, 70 KGy, 80 KGy, 90 KGy, and 10 KGy, but not limited thereto; the oxygen content is 80-600 ppm, exemplary of which is 80 ppm, 100 ppm, 150 ppm, 200 ppm, 250 ppm, 300 ppm, 350 ppm, 400 ppm, 450 ppm, 500 ppm, 550 ppm, and 600 ppm, but not limited thereto. By controlling the energy and time during the EB radiation curing process, it is possible to ensure that the polymer coating is fully combined with the substrate layer. The synergistic effect of voltage, dosage, oxygen content and other conditions can also ensure that the resulting EB layer has excellent wear resistance, scratch resistance and high hardness within the shortest possible curing time, thereby avoiding the generation of more oxidized groups during the curing process, which would result in reduced long-term stability and weather resistance of the resulting EB layer.

[0038] Preferably, the thickness of the EB layer 2 is 20 to 100 μm, exemplarily 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, but not limited thereto. In the present invention, the EB layer 1 is obtained by EB curing technology, which not only plays a certain mechanical support role compared with the traditional method, but also has high double bond conversion efficiency and good curing effect, which can further improve the weather resistance and thermal stability of the EB layer and better protect the film layer. If the hardness of the EB layer is too high and the thickness is too thick, it will easily delaminate between it and the PET layer, thereby reducing the stability of the solar backplane and increasing the performance requirements of the adhesive in the adhesive layer. In addition, if the EB layer is too thick, its light transmittance will be reduced.

[0039] Preferably, a reflective structure 21 (such as Figure 2 As shown in the figure, the reflective structure 21 is a grating pattern. In the present invention, the EB layer 2 is nearly transparent. By setting the grating pattern on the EB layer 2, the solar backplane can have a certain reflective ability to the sunlight passing through the EB layer 2, and the reflected sunlight is reflected to the cell through the panel of the photovoltaic cell assembly, thereby improving the photoelectric conversion efficiency of the solar cell. In addition, the EB layer 2 is obtained by curing the polymer coating, which is conducive to the embossing process of the grating pattern, reduces the processing difficulty of the grating pattern on the high-hardness EB layer 2, and does not affect the hardness of the EB layer 2.

[0040] Furthermore, the preparation method of the grating pattern is: the grating pattern is prepared by processing on the EB layer 2 using an embossing technology. Specifically, a suitable grating texture can be first engraved on a mold, and then the mold is used to emboss and transfer the grating pattern to the EB layer before the EB layer is cured, and finally the EB layer with the grating pattern is cured.

[0041] The width of the grating pattern in the present invention can be determined according to specific designs and requirements, and the spacing between two adjacent grating patterns usually corresponds to the width of the grating patterns to ensure that the solar panel can effectively collect and convert light energy. Further, the width of the grating pattern is 3 to 70 μm, and the spacing between two adjacent grating patterns is 5 to 90 μm. By controlling the size of the grating pattern, the ability to reflect sunlight can be further improved.

[0042] Preferably, the material of the adhesive layer 3 includes polyester coating and polyurethane coating. The adhesive layer 3 provides excellent adhesive ability and can be directly attached to the EB layer 2 to ensure good bonding between the EB layer 2 and the film layer 4. If conventional adhesive materials such as conventional polycarbonate (PC) and ethylene-vinyl acetate copolymer (EVA) are selected to form the adhesive layer, its viscosity is easily affected by environmental conditions and is more prone to yellowing, resulting in poor weather resistance of the solar insulation backsheet.

[0043] Furthermore, the polyester includes but is not limited to PET, polytrimethylene terephthalate (PTT), polybutylene terephthalate (PBT), polybutylene succinate (PBS), and polyhydroxybutyrate (PHA).

[0044] Further, the thickness of the adhesive layer 3 is 1-2 μm, exemplarily 1 μm, 1.1 μm, 1.2 μm, 1.3 μm, 1.4 μm, 1.5 μm, 1.6 μm, 1.7 μm, 1.8 μm, 1.9 μm, and 2 μm, but not limited thereto.

[0045] Preferably, the film layer 4 is a film layer formed of PET, which has excellent electrical insulation performance and light weight. Using it as the core layer in the solar backplane can reduce the weight of the backplane while ensuring the insulation performance of the backplane.

[0046] Further, the film layer 4 has a thickness of 250-350 μm, exemplarily 250 μm, 275 μm, 300 μm, 325 μm, and 350 μm, but not limited thereto.

[0047] Preferably, the protective layer 5 is a protective layer formed of a polyester material, which is used to provide further protection for the film layer 4, further improve the stability of the back panel, and increase the weather resistance and chemical resistance of the solar back panel. The polyester material includes but is not limited to PET. The polyester material is selected as the protective layer, which has good compatibility with the film layer and strong adhesion, so that the two can be compounded through an adhesive layer, further improving the stability of the solar back panel, reducing the probability of its delamination, and reducing the compounding process, making the solar back panel lighter.

[0048] In some preferred embodiments, an anti-ultraviolet additive may be added to the polyester material to achieve a better protection effect and make the solar back panel more weather-resistant.

[0049] Further, the thickness of the protective layer 5 is 20-50 μm, exemplarily 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, but not limited thereto.

[0050] Accordingly, the present invention also provides a method for preparing the solar insulating back sheet, comprising:

[0051] (1) preparing a film layer, and respectively providing an adhesive layer and a protective layer on both sides of the film layer;

[0052] (2) preparing a polymer coating in the EB layer, applying it to the surface of the substrate layer, curing it by electron beam, and setting a grating pattern;

[0053] (3) Compounding the EB layer obtained in (2) with the adhesive layer to obtain a solar insulation back sheet.

[0054] Preferably, the surface of the film layer should be kept clean before the adhesive layer and the protective layer are provided.

[0055] Preferably, step (3) further includes quality inspection, cutting and packaging of the solar insulation backsheet.

[0056] Furthermore, the quality inspection indicators include surface quality, coating uniformity and bonding strength.

[0057] The present invention will be further described below with specific embodiments:

[0058] Example 1

[0059] This embodiment provides a solar insulation back sheet, including a substrate layer, an EB layer, an adhesive layer, a film layer and a protective layer.

[0060] The EB layer is a polymer coating layer obtained by radiation curing through EB curing technology, and the thickness of the EB layer is 60 μm. The EB layer is provided with grating patterns, the width of the grating patterns is 30 μm, and the spacing between two adjacent grating patterns is 40 μm.

[0061] The raw materials for preparing the polymer coating include, by weight: a prepolymer of 25 parts of epoxy acrylate, 25 parts of polyurethane acrylate, 25 parts of polyacrylate, 15 parts of hydroxyethyl methacrylate, 10 parts of trimethylolpropane triacrylate, 0.1 parts of an adhesion promoter (γ-glycidyloxypropyltrimethoxysilane), 0.1 parts of zinc stearate, and 0.2 parts of a leveling agent (BYK333).

[0062] The substrate layer is PET with a thickness of 70 μm; the adhesive layer is a polyurethane coating with a thickness of 1.5 μm; the film layer is a PET film layer with a thickness of 300 μm; and the protective layer is a PET protective layer with a thickness of 35 μm.

[0063] This embodiment also provides a method for preparing a solar insulating back sheet, comprising:

[0064] (1) preparing a PET film layer and ensuring that its surface is clean, and then coating an adhesive layer formed of polyester or polyurethane and a protective layer formed of PET on both sides of the PET film layer respectively;

[0065] (2) preparing a polymer coating in the EB layer, coating it evenly on the surface of the PET substrate film, and adjusting the thickness of the EB coating as required; and embossing the grating pattern onto the EB layer through a mold, and then sending it into an electron beam curing device for curing at a voltage of 120 kV, an irradiation dose of 60 kGy, and an oxygen content of 150 ppm;

[0066] (3) compounding the EB layer obtained in (3) with the adhesive layer to obtain a solar insulation backsheet;

[0067] (4) Conduct quality inspection on the cured solar insulation backsheet to check its surface quality, coating uniformity, bonding strength and other indicators to ensure that it meets the requirements;

[0068] (5) Cutting and packaging: Cut and package the prepared solar insulation backsheet as needed to facilitate subsequent solar cell panel production and assembly.

[0069] Example 2

[0070] This embodiment provides a solar insulation back sheet, which is basically the same as the embodiment 1, except that:

[0071] The thickness of the EB layer is 20 μm, and the adhesive layer is a polyester coating with a thickness of 1 μm.

[0072] Example 3

[0073] This embodiment provides a solar insulation back sheet, which is basically the same as the embodiment 1, except that:

[0074] The thickness of the EB layer was 100 μm, and the thickness of the adhesive layer was 2 μm.

[0075] Example 4

[0076] This embodiment provides a solar insulation back sheet, which is basically the same as the embodiment 1, except that:

[0077] The adhesive layer is a PC layer.

[0078] Example 5

[0079] This embodiment provides a solar insulation back sheet, which is basically the same as the embodiment 1, except that:

[0080] The adhesive layer is an EVA layer.

[0081] Comparative Example 1

[0082] This comparative example provides a solar insulation back sheet, which is basically the same as Example 1, except that:

[0083] It comprises an EB layer, a film layer and a protective layer, and its preparation method is as follows:

[0084] The EB layer and the film layer are compounded by an extrusion process, and then compounded with the protective layer by the same method as in Example 1 to obtain a solar insulation back sheet.

[0085] Comparative Example 2

[0086] This comparative example provides a solar insulation back sheet, which is basically the same as Example 1, except that:

[0087] The invention comprises a PET substrate layer, a polymer coating layer, an adhesive layer, a film layer and a layer. The polymer coating layer comprises a photoinitiator and is obtained by curing with ultraviolet radiation.

[0088] Performance Test:

[0089] The following tests were performed on the solar insulation backsheets obtained in the examples and comparative examples. The test results are shown in Table 1.

[0090] 1. Corrosion resistance: According to 6.14 of GB / T 31034-2014 "Insulating backsheet for crystalline silicon solar cell modules", the salt spray resistance is measured to observe whether the solar backsheet has abnormal phenomena such as blistering, cracking, powdering and obvious discoloration. It is specified that no delamination, blistering, cracking, powdering and obvious discoloration are qualified (OK).

[0091] 2. Thermal stability: The longitudinal and lateral shrinkage rates of the solar backsheet are measured according to 6.4 thermal shrinkage rate in GB / T 31034-2014 "Insulating backsheet for crystalline silicon solar cell modules".

[0092] 3. Weather resistance (UV aging test): Determine the yellowing index of the solar backsheet by UV treatment according to 6.20 in GB / T 31034-2014 "Insulating backsheet for crystalline silicon solar cell modules".

[0093] 4. Adhesion: Determined in accordance with GB / T 9286-1998 "Scratch test for paint and varnish films".

[0094] Table 1 Performance test results of embodiments and comparative examples

[0095]

[0096] From the above results, it can be seen that compared with the fluorine-free resin coating prepared by UV curing, the EB layer prepared by EB curing in the present invention can well improve the corrosion resistance, thermal stability and weather resistance of the solar backsheet, improve the durability of the solar backsheet, and the adhesion between the layers is good, which improves the mechanical properties of the obtained solar insulation backsheet. In addition, the use of fluorine-free technology meets environmental protection requirements and improves the sustainability of the solar backsheet.

[0097] The above disclosure is only a preferred embodiment of the present invention, which certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. A solar insulation back sheet, characterized in that: It comprises a substrate layer, an EB layer, a film layer and a protective layer. The EB layer is a polymer coating layer obtained by radiation curing through an EB curing technology. The EB layer and the film layer are compounded through an adhesive layer.

2. The solar insulation back sheet according to claim 1, characterized in that: The thickness of the EB layer is 20-100 μm.

3. The solar insulation back sheet according to claim 1, characterized in that: The voltage of the EB radiation curing is 100-150 kV, the irradiation dose is 20 KGy-100 kGy, and the oxygen content is 80-600 ppm.

4. The solar insulation back sheet according to claim 1, characterized in that: A reflective structure is arranged on the EB layer, and the reflective structure is a grating pattern.

5. The solar insulation back sheet according to claim 4, characterized in that: The width of the grating pattern is 3 to 70 μm, and the spacing between two adjacent grating patterns is 5 to 90 μm; The method for preparing the grating pattern is as follows: the grating pattern is prepared on the EB layer by adopting an embossing technology.

6. The solar insulation back sheet according to claim 1, characterized in that: The polymer coating is applied by a coating process, wherein the coating process is direct coating, wherein the polymer coating is directly applied to the surface of the substrate layer, and then radiation cured by EB curing technology.

7. The solar insulation back sheet according to claim 1, characterized in that: The polymer coating is a fluorine-free polymer coating, and the raw materials for preparing the polymer coating include, by weight, 30 to 90 parts of prepolymer, 10 to 40 parts of active diluent and 0.1 to 15 parts of auxiliary agent, wherein the prepolymer is selected from one or more of epoxy acrylate, polyurethane acrylate, polyester acrylate, polyacrylate and polyether acrylate.

8. The solar insulation back sheet according to claim 1, characterized in that: The adhesive layer is one or more of a polyester coating and a polyurethane coating, and the thickness of the adhesive layer is 1 to 2 μm.

9. The solar insulation back sheet according to claim 1, characterized in that: The substrate layer is made of one or more of PET and PUE, and the thickness of the substrate layer is 50 to 300 μm; The film layer is made of PET, and the thickness of the film layer is 250-350 μm; The protective layer is made of polyester material, and the thickness of the protective layer is 20-50 μm.

10. A method for preparing a solar insulating back sheet according to any one of claims 1 to 9, characterized in that: include: (1) preparing a film layer, and respectively providing an adhesive layer and a protective layer on both sides of the film layer; (2) preparing a polymer coating in the EB layer, applying it to the surface of the substrate layer, curing it by electron beam, and setting a grating pattern; (3) Compounding the EB layer obtained in (2) with the adhesive layer to obtain a solar insulation back sheet.

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