Composite board and solar photovoltaic module

Abstract

This disclosure relates to a composite panel and a solar photovoltaic module. The composite panel includes a weather-resistant coating, a first light-transmitting layer, and a second light-transmitting layer. The weather-resistant coating is applied above the first light-transmitting layer, and the second light-transmitting layer is disposed below the first light-transmitting layer. The weather-resistant coating is an organic-inorganic hybrid layer containing oligomeric silsesquioxanes, the first light-transmitting layer is a polymethyl methacrylate layer, and the second light-transmitting layer is a polycarbonate layer. The refractive indices of the weather-resistant coating, the first light-transmitting layer, and the second light-transmitting layer increase sequentially. The composite panel has a weather-resistant coating on its surface, providing good weather resistance. Furthermore, because each material layer has a suitable refractive index and thickness, and the refractive indices of each material layer increase sequentially, light reflection is effectively reduced, thus the composite panel also has good light transmittance.

Description

Technical Field

[0001] This disclosure relates to the field of solar photovoltaic technology, specifically to a composite sheet material and a solar photovoltaic module. Background Technology

[0002] With the establishment of carbon peaking and carbon neutrality environmental goals, energy-efficient buildings have developed rapidly, and photovoltaic (PV) modules are a crucial product for achieving this. PV modules typically include bifacial and monofacial PV modules, with bifacial PV modules offering better performance and thus finding wider application.

[0003] In related technologies, the front and back panels of bifacial photovoltaic modules are typically made of glass, which has disadvantages such as high installation costs, fragility, and heavy weight. To solve this problem, the industry usually uses polymer materials such as polymethyl methacrylate (PMMA), polycarbonate (PC), and polyethylene terephthalate to replace glass in the preparation of the front and back panels of bifacial photovoltaic modules.

[0004] However, in the process of developing this disclosure, the inventors discovered that existing photovoltaic module polymer materials for the front and / or back panels suffer from poor weather resistance and poor light transmittance. For example, polyethylene terephthalate (PET) has poor weather resistance, making it difficult to meet the requirements for long-term outdoor use; polymethyl methacrylate (PMMA) has poor temperature resistance, making it difficult to use at high temperatures for extended periods, especially under the limited heat dissipation conditions after the photovoltaic module is integrated with the building. Polycarbonate materials are prone to yellowing under ultraviolet radiation, affecting light transmittance and consequently impacting the power generation efficiency of the photovoltaic module. Although conventional composite PMMA / PC co-extrusion materials can improve wear resistance and impact resistance, their UV resistance remains insufficient. Summary of the Invention

[0005] The purpose of this disclosure is to solve the problems of poor weather resistance and poor light transmittance of existing photovoltaic module polymer material front and / or back panels, and to provide a composite material and a solar photovoltaic module.

[0006] To achieve the above objectives, this disclosure provides a composite material for solar photovoltaic modules. The composite material includes a weather-resistant coating, a first light-transmitting layer, and a second light-transmitting layer. The weather-resistant coating is applied above the first light-transmitting layer, and the second light-transmitting layer is disposed below the first light-transmitting layer. The weather-resistant coating is an organic-inorganic hybrid layer containing oligomeric silsesquioxanes, the first light-transmitting layer is a polymethyl methacrylate layer, and the second light-transmitting layer is a polycarbonate layer. The refractive indices of the weather-resistant coating, the first light-transmitting layer, and the second light-transmitting layer increase sequentially.

[0007] Optionally, the weather-resistant coating has a refractive index of less than 1.48, preferably 1.38 to 1.48, and a thickness of 0.1 μm to 1 μm; the first light-transmitting layer has a refractive index of 1.48 to 1.50 and a thickness of 20 μm to 1000 μm; the second light-transmitting layer has a refractive index of 1.56 to 1.61 and a thickness of 150 μm to 3000 μm.

[0008] Optionally, the weather-resistant coating contains oligomeric silsesquioxane, acrylate prepolymer, multifunctional acrylic monomer, and curing agent. Based on the total weight of the weather-resistant coating, the content of the oligomeric silsesquioxane is 1-20 wt%, the content of the acrylate prepolymer is 15-50 wt%, the content of the multifunctional acrylic monomer is 20-60 wt%, and the content of the curing agent is 0.1-1.5 wt%. Preferably, based on the total weight of the weather-resistant coating, the content of the oligomeric silsesquioxane is 5-20 wt%, the content of the acrylate prepolymer is 20-50 wt%, the content of the multifunctional acrylic monomer is 25-60 wt%, and the content of the curing agent is 0.5-1.5 wt%.

[0009] Optionally, the oligomeric silsesquioxane has at least one functional group capable of reacting with the resin; the acrylate prepolymer is selected from at least one of polyurethane acrylate prepolymers, epoxy acrylate prepolymers, silicone acrylate prepolymers, and fluorinated acrylate prepolymers; the multifunctional acrylic monomer includes trifunctional acrylic monomers; and the curing agent is selected from at least one of benzoyl peroxide (BPO), azobisisobutyronitrile (AIBN), dimethyl azobisisobutyrate, diisopropyl peroxide, and dicyclohexyl peroxide.

[0010] Optionally, an adhesive layer is further provided between the first light-transmitting layer and the second light-transmitting layer, wherein the refractive index of the adhesive layer is 1.48 to 1.57 and the thickness is 5 μm to 150 μm; preferably, the refractive index of the adhesive layer is 1.5 to 1.56 and the thickness is 50 μm to 150 μm.

[0011] Optionally, the adhesive layer contains polyurethane, an ultraviolet absorber, and an ultraviolet stabilizer, wherein, based on the total weight of the adhesive layer, the polyurethane content is 95-99 wt%, the ultraviolet absorber content is 0.1-2 wt%, and the ultraviolet stabilizer content is 0.1-1 wt%.

[0012] Optionally, an adhesive layer is provided below the second light-transmitting layer, the thickness of which is 20μm to 100μm.

[0013] Optionally, the tackifying layer contains maleic anhydride-modified polyolefin and / or ethylene vinyl acetate.

[0014] This disclosure also provides a solar photovoltaic module, the solar photovoltaic module including a front panel, a front encapsulation layer, a power generation unit layer, a rear encapsulation layer and a rear panel, the front encapsulation layer being disposed between the front panel and the power generation unit layer, and the rear encapsulation layer being disposed between the rear panel and the power generation unit layer; wherein, the front panel and / or the rear panel are made of composite material as described in any one of the above.

[0015] Optionally, the front encapsulation layer is selected from at least one of EVA layer, POE layer, PVB layer, TPU layer, PDMS layer or ionomer layer; the rear encapsulation layer is selected from at least one of EVA layer, POE layer, PVB layer, PDMS layer, TPU layer or ionomer layer.

[0016] Through the above technical solution, the composite board provided by this disclosure includes a weather-resistant coating, a first light-transmitting layer and a second light-transmitting layer, which has good weather resistance and impact resistance; at the same time, since each material layer has a suitable refractive index and thickness, and the refractive index of each material layer is in an increasing relationship, it can effectively reduce light reflection, so the composite board also has good light transmittance.

[0017] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings:

[0019] Figure 1 This is a structural schematic diagram of a composite board provided in an embodiment of this disclosure;

[0020] Figure 2 This is a schematic diagram of another composite material provided in an embodiment of this disclosure;

[0021] Figure 3 This is a schematic diagram of the structure of a solar photovoltaic module according to a specific embodiment of this disclosure.

[0022] Explanation of reference numerals in the attached figures

[0023] 1. Weather-resistant coating

[0024] 2. First light-transmitting layer

[0025] 3. Second light-transmitting layer

[0026] 4. Adhesive layer

[0027] 5. Tackifying layer

[0028] 6. Front panel material

[0029] 7. Front encapsulation material layer

[0030] 8. Power generation unit layer

[0031] 9. Post-encapsulation material layer

[0032] 10. Back panel material Detailed Implementation

[0033] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0034] This disclosure provides a composite material for solar photovoltaic modules. The composite material includes a weather-resistant coating, a first light-transmitting layer, and a second light-transmitting layer. The weather-resistant coating is applied above the first light-transmitting layer, and the second light-transmitting layer is disposed below the first light-transmitting layer. The weather-resistant coating is an organic-inorganic hybrid layer containing oligomeric silsesquioxanes, the first light-transmitting layer is a polymethyl methacrylate layer, and the second light-transmitting layer is a polycarbonate layer. The refractive indices of the weather-resistant coating, the first light-transmitting layer, and the second light-transmitting layer increase sequentially.

[0035] In this disclosure, specifically, the first and second light-transmitting layers can be prepared using a co-extrusion process, or the first and second light-transmitting layers can be prepared separately and then hot-pressed together. Before hot-pressing, the lower surface of the first and upper surfaces of the second light-transmitting layers can be pre-treated with surface treatments such as corona treatment or plasma treatment. The weather-resistant coating can be formed by curing a weather-resistant coating applied to the surface of the first light-transmitting layer. The curing method can be room temperature curing, heat curing, or ultraviolet light curing, preferably ultraviolet light curing. Before coating, the upper surface of the first light-transmitting layer can be pre-treated with surface treatments such as corona treatment or plasma treatment.

[0036] The composite sheet provided in this disclosure has excellent impact resistance, and the surface of the composite sheet is coated with a weather-resistant coating, which has good weather resistance. At the same time, since each material layer has a suitable refractive index and thickness, and the refractive index of each material layer is in an increasing relationship, it can effectively reduce light reflection. Therefore, the composite sheet also has good light transmittance.

[0037] In a preferred embodiment of this disclosure, the weather-resistant coating has a refractive index of less than 1.48, more preferably 1.38–1.48, and a thickness of 0.1 μm–1 μm; the first light-transmitting layer has a refractive index of 1.48–1.50 and a thickness of 20 μm–1000 μm; the second light-transmitting layer has a refractive index of 1.56–1.61 and a thickness of 150 μm–3000 μm. Under these preferred conditions, the refractive index and thickness of each material layer are more rationally matched, and the light transmittance of the composite board is more prominent.

[0038] In this disclosure, specifically, a polymethyl methacrylate (PMMA) layer and a polycarbonate (PC) layer are used in combination, with the PMMA layer disposed on the outer side of the PC layer. This effectively overcomes the problems of the PMMA layer's brittleness and poor impact resistance, and also effectively solves the problems of the PC layer's poor wear resistance and yellowing under ultraviolet irradiation. In this preferred embodiment, the composite board provided by this disclosure also has good impact resistance and wear resistance. Furthermore, the inorganic portion of the weather-resistant coating can effectively block the propagation of ultraviolet rays, thereby improving the composite board's UV resistance and further preventing the yellowing of the PC layer under ultraviolet irradiation from affecting the composite board's light transmittance.

[0039] According to this disclosure, the weather-resistant coating can vary within a certain range. For example, the weather-resistant coating may contain oligomeric silsesquioxane, acrylate prepolymer, multifunctional acrylic monomer, and curing agent. Based on the total weight of the weather-resistant coating, the content of the oligomeric silsesquioxane may be 1–20 wt%, the content of the acrylate prepolymer may be 15–50 wt%, the content of the multifunctional acrylic monomer may be 20–60 wt%, and the content of the curing agent may be 0.1–1.5 wt%.

[0040] Preferably, based on the total weight of the weather-resistant coating, the content of the oligomeric silsesquioxane can be 5-20 wt%, the content of the acrylate prepolymer can be 20-50 wt%, the content of the polyfunctional acrylic monomer can be 25-60 wt%, and the content of the curing agent can be 0.5-1.5 wt%.

[0041] According to this disclosure, in a preferred embodiment, the oligomeric silsesquioxane has at least one functional group capable of reacting with the resin, such as an epoxy functional group. The acrylate prepolymer can be selected from a certain range; for example, the acrylate prepolymer can be selected from at least one of polyurethane acrylate prepolymers, epoxy acrylate prepolymers, silicone acrylate prepolymers, and fluorinated acrylate prepolymers. The functionality of the multifunctional acrylic monomer can vary within a certain range; for example, the multifunctional acrylic monomer can include a trifunctional acrylic monomer. The curing agent can be selected from a certain range; for example, the curing agent can be selected from at least one of benzoyl peroxide (BPO), azobisisobutyronitrile (AIBN), dimethyl azobisisobutyrate, diisopropyl peroxide, and dicyclohexyl peroxide.

[0042] According to this disclosure, in order to increase the stability of the composite board, in a preferred embodiment, an adhesive layer may be provided between the first light-transmitting layer and the second light-transmitting layer, wherein the refractive index of the adhesive layer may be 1.48 to 1.57 and the thickness may be 5 μm to 150 μm; preferably, the refractive index of the adhesive layer is 1.5 to 1.56 and the thickness is 50 μm to 150 μm.

[0043] Specifically, an adhesive layer material can be placed between the first and second light-transmitting layers, and then hot-pressed to form an adhesive layer between the first and second light-transmitting layers. The adhesive layer can increase the adhesion between the first and second light-transmitting layers, thereby increasing the stability of the composite board.

[0044] According to this disclosure, the adhesive layer can be selected within a certain range. For example, the adhesive layer may contain a resin matrix, an ultraviolet absorber, and an ultraviolet stabilizer. Based on the total weight of the adhesive layer, the content of the resin matrix may be 95-99 wt%, the content of the ultraviolet absorber may be 0.1-2 wt%, and the content of the ultraviolet stabilizer may be 0.1-1 wt%.

[0045] The ultraviolet light absorber and ultraviolet light stabilizer can be selected within a certain range. For example, the ultraviolet light absorber can be selected from at least one of benzophenone or benzotriazole, and the ultraviolet light stabilizer can be selected from at least one of hindered amines.

[0046] According to this disclosure, an adhesive layer may be provided below the second light-transmitting layer, the thickness of which may be 20 μm to 100 μm. Optionally, the adhesive layer may contain maleic anhydride-modified polyolefin and / or ethylene vinyl acetate.

[0047] In this disclosure, specifically, when the composite sheet provided in this disclosure is used to manufacture the front or back panel of a solar photovoltaic module, the side closest to the photovoltaic module encapsulation material is a PC layer. However, the adhesion between the PC layer and the encapsulation material is poor, and it is easy to fall off under conditions such as high temperature and high humidity. The composite sheet of this disclosure has an adhesive layer underneath, which can significantly improve the adhesion between the PC layer and the encapsulation material.

[0048] Alternatively, the tackifying layer material can be coated onto the lower surface of the second light-transmitting layer, which has undergone surface treatment such as corona treatment or plasma treatment, to form the tackifying layer. Or, the tackifying layer can be prepared in advance and then pressed onto the lower surface of the second light-transmitting layer using methods such as hot pressing.

[0049] This disclosure also provides a solar photovoltaic module, such as Figure 3 As shown, the solar photovoltaic module may include a front panel, a front encapsulation layer, a power generation unit layer, a rear encapsulation layer, and a rear panel. The front encapsulation layer is disposed between the front panel and the power generation unit layer, and the rear encapsulation layer is disposed between the rear panel and the power generation unit layer. The front panel and / or the rear panel are made of composite materials as described above.

[0050] In the solar photovoltaic module provided in this disclosure, the thickness of the front panel can be 100μm to 5mm, and the light transmittance can be ≥85%. The back panel can be made of the composite material provided in this disclosure, or a conventional solar transparent back panel can be selected, such as a TPC back panel, a TPO back panel, a KPE back panel, a KPC back panel, or a CPC back panel.

[0051] According to this disclosure, the front encapsulation layer and the rear encapsulation layer can be selected from a certain range. For example, the front encapsulation layer can be selected from at least one of EVA layer, POE layer, PVB layer, TPU layer, PDMS layer, or ionomer layer; the rear encapsulation layer can be selected from at least one of EVA layer, POE layer, PVB layer, PDMS layer, TPU layer, or ionomer layer. Further, the light transmittance of the front encapsulation layer can be ≥90%, and the light transmittance of the rear encapsulation layer can be ≥90%.

[0052] Optionally, the power generation unit layer can be composed of double-sided power generation cells. Specifically, the positive and negative electrodes of adjacent cells can be connected in series using interconnecting strips or conductive adhesive to form a battery string. Then, multiple battery strings can be connected together using busbars and arranged according to preset circuit requirements to form the power generation unit layer.

[0053] The present disclosure is further illustrated below by means of examples, but the present disclosure is not limited thereto. Unless otherwise specified, the raw materials, reagents, instruments and equipment involved in the embodiments of the present disclosure can all be obtained by purchase.

[0054] Example 1

[0055] Composite boards are prepared using the following method:

[0056] (1) A surface of a PMMA board is subjected to corona treatment, and a weather-resistant coating is applied to the treated surface. Then, ultraviolet light is used for curing so that the weather-resistant coating is cured on the surface of the PMMA board to form a weather-resistant coating, thus obtaining the first intermediate product.

[0057] The PMMA board has a refractive index of 1.49 and a thickness of 55 μm. The weather-resistant coating consists of 15 wt% oligomeric silsesquioxane, 45 wt% acrylate prepolymer (aliphatic polyurethane acrylate), 40 wt% polyfunctional acrylic monomers (dipropylene glycol diacrylate and trimethylolpropane triacrylate), and 1 wt% curing agent (TRIGONOX C-C75). The cured weather-resistant coating has a refractive index of 1.45 and a thickness of 0.1 μm.

[0058] (2) Flip the first intermediate product, perform corona treatment on the other surface of the PMMA board, and coat the treated surface with adhesive material. Then perform corona treatment on one surface of the PC board, and stack the treated surface face down on the adhesive material. Finally, perform hot pressing to form an adhesive layer between the PMMA board and the PC board to obtain the second intermediate product.

[0059] The PC board has a refractive index of 1.59 and a thickness of 1000 μm; the adhesive layer material includes 98 wt% polyurethane, 1 wt% UV absorber and 1 wt% UV stabilizer; the adhesive layer formed by lamination has a refractive index of 1.52 and a thickness of 100 μm.

[0060] (3) A corona treatment is performed on another surface of the PC board, and an adhesive layer material (maleic anhydride modified polyolefin) is coated on the treated surface to form an adhesive layer, thereby obtaining the composite board of this embodiment; wherein, the refractive index of the adhesive layer is 1.49 and the thickness is 150μm.

[0061] The composite board prepared in this embodiment is as follows: Figure 1 As shown.

[0062] Example 2

[0063] Composite boards are prepared using the following method:

[0064] (1) A composite plate of PMMA and PC was prepared by co-extrusion process to obtain the first intermediate product; wherein, the refractive index of PMMA plate is 1.49 and the thickness is 50 μm; the refractive index of PC plate is 1.59 and the thickness is 950 μm.

[0065] (2) The surface of the PMMA board of the first intermediate product is subjected to corona treatment, and a weather-resistant coating is applied to the treated surface. Then, ultraviolet light curing is performed to cure the weather-resistant coating on the surface of the PMMA board to form a weather-resistant coating, thus obtaining the second intermediate product.

[0066] The weather-resistant coating comprises 10 wt% oligomeric silsesquioxane, 45 wt% acrylate prepolymer (aliphatic polyurethane acrylate), 44 wt% multifunctional acrylic monomers (dipropylene glycol diacrylate and trimethylolpropane triacrylate), and 1 wt% curing agent (TRIGONOX C-C75); the cured weather-resistant coating has a refractive index of 1.47 and a thickness of 1 μm.

[0067] (3) Flip the second intermediate product and perform corona treatment on the PC board surface of the second intermediate product. Then, coat the treated surface with an tackifying layer material (EVA) to form an tackifying layer, thereby obtaining the composite board of this embodiment. The tackifying layer has a refractive index of 1.48 and a thickness of 100 μm.

[0068] The composite board prepared in this embodiment is as follows: Figure 2 As shown.

[0069] Test Example 1

[0070] The impact resistance of the composite boards prepared in Examples 1 and 2 was tested. The method for testing the impact resistance was ice hockey impact test, specifically, ice hockey balls with diameters of 25 mm, 35 mm, and 45 mm were impacted at an impact speed of 27.2 m / s. The test results are shown in Table 1.

[0071] Table 1

[0072] Composite boards 25mm 35mm 45mm Example 1 No cracks No cracks Slight breakage Example 2 No cracks No cracks Slight breakage

[0073] As can be seen from Table 1, the composite material provided in this disclosure has good impact resistance and can withstand the impact of a 35mm diameter ice puck at 27.2m / s without breaking.

[0074] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0075] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0076] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A composite sheet for a solar photovoltaic module, characterized by, The composite board includes a weather-resistant coating, a first light-transmitting layer, and a second light-transmitting layer. The weather-resistant coating is applied above the first light-transmitting layer, and the second light-transmitting layer is disposed below the first light-transmitting layer. The weather-resistant coating is an organic-inorganic hybrid layer containing oligomeric silsesquioxane, the first light-transmitting layer is a polymethyl methacrylate layer, and the second light-transmitting layer is a polycarbonate layer; the refractive indices of the weather-resistant coating, the first light-transmitting layer, and the second light-transmitting layer increase sequentially.

2. The composite sheet material of claim 1, wherein The weather-resistant coating has a refractive index of less than 1.48 and a thickness of 0.1 μm to 1 μm; the first light-transmitting layer has a refractive index of 1.48 to 1.50 and a thickness of 20 μm to 1000 μm; the second light-transmitting layer has a refractive index of 1.56 to 1.61 and a thickness of 150 μm to 3000 μm.

3. The composite sheet material of claim 2, wherein, The refractive index of the weather-resistant coating is 1.38 to 1.

48.

4. The composite sheet material of claim 1, wherein The weather-resistant coating contains oligomeric silsesquioxane, acrylate prepolymer, multifunctional acrylic monomer, and curing agent; Based on the total weight of the weather-resistant coating, the content of the oligomeric silsesquioxane is 1-20 wt%, the content of the acrylate prepolymer is 15%-50 wt%, the content of the polyfunctional acrylic monomer is 20-60 wt%, and the content of the curing agent is 0.1-1.5 wt%.

5. The composite sheet material of claim 4, wherein, Based on the total weight of the weather-resistant coating, the content of the oligomeric silsesquioxane is 5-20 wt%, the content of the acrylate prepolymer is 20-50 wt%, the content of the polyfunctional acrylic monomer is 25-60 wt%, and the content of the curing agent is 0.5-1.5%.

6. The composite sheet material of claim 5, wherein, The oligomeric silsesquioxane has at least one functional group capable of reacting with the resin. The acrylate prepolymer is selected from at least one of polyurethane acrylate prepolymer, epoxy acrylate prepolymer, silicone acrylate prepolymer, and fluorinated acrylate prepolymer; The multifunctional acrylic monomers include trifunctional acrylic monomers; The curing agent is selected from at least one of benzoyl peroxide (BPO), azobisisobutyronitrile (AIBN), dimethyl azobisisobutyrate, diisopropyl peroxide, and dicyclohexyl peroxide.

7. The composite sheet according to any one of claims 1 to 6, wherein An adhesive layer is provided between the first light-transmitting layer and the second light-transmitting layer. The adhesive layer has a refractive index of 1.48 to 1.57 and a thickness of 5 μm to 150 μm.

8. The composite sheet material of claim 7, wherein, The adhesive layer has a refractive index of 1.50 to 1.56 and a thickness of 50 μm to 150 μm.

9. The composite sheet material of claim 8, wherein, The adhesive layer contains polyurethane, ultraviolet light absorber and ultraviolet light stabilizer. Based on the total weight of the adhesive layer, the polyurethane content is 95-99 wt%, the ultraviolet light absorber content is 0.1-2 wt%, and the ultraviolet light stabilizer content is 0.1-1 wt%.

10. The composite sheet according to any one of claims 1 to 6, wherein Below the second light-transmitting layer, there is also an adhesive layer with a thickness of 20μm to 100μm.

11. The composite sheet material of claim 10, wherein, The tackifying layer contains maleic anhydride-modified polyolefin and / or ethylene vinyl acetate.

12. A solar photovoltaic module, characterized by, The solar photovoltaic module includes a front panel, a front encapsulation layer, a power generation unit layer, a rear encapsulation layer, and a rear panel. The front encapsulation layer is disposed between the front panel and the power generation unit layer, and the rear encapsulation layer is disposed between the rear panel and the power generation unit layer. The front panel and / or the rear panel are made of the composite material as described in any one of claims 1 to 11.

13. The solar photovoltaic module of claim 12, wherein, The front encapsulation layer is selected from at least one of EVA layer, POE layer, PVB layer, TPU layer, PDMS layer or ionomer layer; The post-encapsulation layer is selected from at least one of EVA layer, POE layer, PVB layer, PDMS layer, TPU layer or ionomer layer.

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