A continuous photovoltaic reinforced panel and a preparation method and application thereof

Abstract

This invention relates to the field of photovoltaic panel technology, and discloses a continuous photovoltaic reinforced panel, its preparation method, and its application. The continuous photovoltaic reinforced panel comprises a thin-film substrate and a composite reinforcing material layer; the composite reinforcing material layer is an integral continuous composite structure formed by impregnating a glass fiber layer with unsaturated polyester resin and then curing it; the glass fiber layer is glass fiber cloth or glass fiber mat; the raw material formulation of the unsaturated polyester resin material is: 90-98 parts unsaturated polyester resin matrix, 1-5 parts curing agent, 0.5-2 parts ultraviolet absorber, 0.5-3 parts hydrolysis resistant agent, and 1-4 parts diluent; the curing agent is a curing agent capable of generating free radicals; the diluent is methyl methacrylate and / or polyethylene glycol diacrylate. This continuous photovoltaic reinforced panel is lightweight and exhibits excellent flexural strength, impact strength, scratch resistance, abrasion resistance, light transmittance, light transmittance after PCT48H, resistance to PCT48H yellowing, and resistance to UV yellowing.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic panel technology, specifically to a continuous photovoltaic enhancement panel, its preparation method, and its application. Background Technology

[0002] In recent years, with the increasing emphasis on environmental governance and the growing public awareness of environmental protection, the photovoltaic industry, represented by solar power generation, has experienced rapid development. As the photovoltaic industry continues to develop, major photovoltaic companies are actively researching and developing bifacial photovoltaic modules in pursuit of higher power generation efficiency. Currently, there are two main encapsulation methods for bifacial photovoltaic modules on the market: one where the front of the solar cell is glass and the back is a transparent backsheet; and the other where both sides of the solar cell (front and back) are glass.

[0003] Bifacial photovoltaic (PV) modules with single-sided glass and transparent backsheets, due to the use of thicker glass (typically 3.2mm), significantly increase the weight of the PV modules, limiting their use in applications such as rooftop distributed generation. Of course, to adapt to the trend of larger PV module sizes, glass manufacturers are gradually reducing the thickness of the glass, reducing it to 2.5mm or 2.0mm, and even introducing 1.6mm glass. However, the reduction in glass thickness places higher demands on the mechanical load capacity of the transparent backsheet. The encapsulation method of 2.0mm thick glass with a conventional transparent backsheet for solar cells cannot meet the load testing requirements; glass must still be encapsulated on the back of the solar cells to pass the load test. This back-encapsulation of glass undoubtedly increases the weight of the PV module. Furthermore, both types of bifacial PV modules use glass, which is fragile, inevitably leading to breakage and installation difficulties during transportation and installation.

[0004] To address the existing problems in photovoltaic modules and broaden their application range, there is an urgent need for a photovoltaic reinforcement panel that can replace glass, offering superior overall performance such as lightweight, high mechanical strength, and excellent light transmittance, and capable of generating electricity from both sides. Lightweight, high-strength photovoltaic panels hold significant market potential and represent one of the future development trends.

[0005] In the prior art, such as the composite layer for resisting damp heat aging disclosed in publication number CN114434891A, the preparation method and application of the same, it includes at least one fiber fabric layer, and a first thermoplastic film layer and a second thermoplastic film layer laminated on the upper and lower surfaces of the fiber fabric layer by an impregnation melt composite molding process. Each thermoplastic film layer is made of a thermoplastic polymer, and the fiber fabric layer is woven from continuous fibers. In this invention, the fibers used are glass fiber, carbon fiber, or aramid fiber, and the thermoplastic layer is an opaque or poorly translucent copolymer of polypropylene, polyethylene, polystyrene, polyvinyl chloride, or ABS. Although the prepared backsheet has good resistance to damp heat aging, the light transmittance of the resulting backsheet is poor, which cannot meet the requirements of bi-sided power generation. Furthermore, the prepared sheet is relatively soft, and its bending resistance, scratch resistance, and abrasion resistance need further improvement.

[0006] Regarding the integrated glass fiber reinforced photovoltaic panel, its preparation method, and its application disclosed in publication number CN115230263A, the reinforcing composite material layer uses a surface-functionalized glass fiber layer and a polyester material layer on the basis of a surface-functionalized substrate layer to prepare the glass fiber reinforced photovoltaic panel. The polyester material layer is formed by mixing polyester resin, curing agent, chain extender, ultraviolet absorber, and other additives, placing the polyester material in a mold, and then heating and laminating it for curing. The polyester resin is a polyester polyol and / or polyether polyol with a viscosity of 1000-20000 cp.s, and the curing agent is a diisocyanate curing agent such as diphenylmethane diisocyanate. The photovoltaic panel prepared in this way has excellent properties such as lightweight, good light transmission, non-delamination, and resistance to yellowing. However, the flexural strength of this photovoltaic panel is relatively low, which will affect the load-bearing capacity of the photovoltaic module, causing the photovoltaic module to fail the load test, and therefore it is difficult to replace the photovoltaic glass used in existing photovoltaic modules. Furthermore, the photovoltaic panel exhibits a high number of air bubbles during its manufacturing process. This is because the high viscosity of polyester polyols and / or polyether polyols generates a large number of air bubbles during mixing. The high resin viscosity makes defoaming difficult. Additionally, the curing agent contains isocyanate groups, which react with moisture in the glass fiber and the environment, generating carbon dioxide and producing air bubbles. This ultimately leads to the formation of air bubbles in the panel. Consequently, the photovoltaic panel's resistance to PCT48H yellowing, UV yellowing, scratch resistance, and abrasion resistance still need improvement. Summary of the Invention

[0007] The purpose of this invention is to overcome the shortcomings of the prior art and provide a continuous photovoltaic enhancement board, its preparation method, and its application.

[0008] Based on this, the present invention discloses a continuous photovoltaic enhancement board, comprising a thin film substrate and a composite reinforcement material layer; the composite reinforcement material layer is an integral continuous composite structure formed by impregnating unsaturated polyester resin material from one surface of a glass fiber layer to the other surface of the glass fiber layer and then curing it.

[0009] The glass fiber layer is glass fiber cloth or glass fiber mat;

[0010] The unsaturated polyester resin material, by weight, has the following raw material formula:

[0011]

[0012]

[0013] The curing agent is a curing agent that can generate free radicals; the diluent is methyl methacrylate and / or polyethylene glycol diacrylate.

[0014] Preferably, the diluent is a mixture of methyl methacrylate and polyethylene glycol diacrylate in a mass ratio of 1:1; the molecular weight of the PEGDA is 250-10000.

[0015] More preferably, the molecular weight of the PEGDA is 250.

[0016] Preferably, the curing agent is one or more of tert-butyl peroxide, benzoyl peroxide, or cyclohexanone peroxide.

[0017] Preferably, the viscosity of the unsaturated polyester resin matrix at 25°C is 200-250 cps; the unsaturated polyester resin matrix is ​​one or more of orthophthalic unsaturated polyester resin, isophthalic unsaturated polyester resin, terephthalic unsaturated polyester resin, bisphenol A unsaturated polyester resin, or vinyl unsaturated polyester resin.

[0018] Preferably, the ultraviolet absorber is UV-329, UV-P, UV-328 or UV-571; the hydrolysis resistant agent is polycarbodiimide.

[0019] Preferably, the film substrate is a polycarbonate film, a polyethylene terephthalate film, or a polymethyl methacrylate film.

[0020] This invention also discloses a method for preparing a continuous photovoltaic enhancement board, comprising the following preparation steps:

[0021] S1. Corona treatment is applied to the thin film substrate;

[0022] S2. According to the raw material formula, weigh the raw materials of unsaturated polyester resin material, mix and stir the raw materials evenly, and then pour the unsaturated polyester resin material into the resin tank reserved in the continuous machine board production line.

[0023] S3. Turn on the power and lay the film substrate flat on the surface of the conveyor belt of the continuous machine-made board production line, so that the film substrate moves forward at a certain speed under the traction of the continuous machine-made board production line.

[0024] S4. When the film substrate is conveyed to the unsaturated polyester resin material, the unsaturated polyester resin material in the resin tank is applied to the surface of the film substrate by a scraper.

[0025] S5. Automatically unwind the glass fiber layer and lay it into the unsaturated polyester resin material on the surface of the film substrate, so that the unsaturated polyester resin material permeates the entire glass fiber layer.

[0026] S6. Then roll forming and curing are performed to obtain a continuous photovoltaic reinforced sheet.

[0027] Preferably, in step S1, the power of the corona treatment is 5000-15000W;

[0028] In step S3, the forward speed of the thin film substrate is 5-10 m / min.

[0029] Preferably, in step S6, the curing temperature is 120-150℃ and the time is 3-5 minutes.

[0030] The present invention also discloses an application of a continuous photovoltaic enhancement sheet, which is used as a transparent front sheet and a transparent back sheet for photovoltaic modules.

[0031] Compared with the prior art, the present invention has at least the following beneficial effects:

[0032] In the continuous photovoltaic enhancement panel of this embodiment, the unsaturated polyester resin used is inexpensive and has low viscosity, resulting in excellent wettability with glass fiber cloth or glass fiber mat. The wetting speed of the low-viscosity unsaturated polyester resin is significantly better than that of other resins (such as polyurethane, acrylic resin, epoxy resin, etc.). Moreover, this wettability is further enhanced by the addition of a low-viscosity, cross-linkable curable diluent (i.e., methyl methacrylate and / or polyethylene glycol diacrylate), allowing the unsaturated polyester resin to penetrate the glass fiber cloth or glass fiber mat in a very short time. Under the action of a curing agent that can generate free radicals, it is rapidly cured and molded to form a macromolecular cross-linked network structure of glass fiber cloth or glass fiber mat impregnated with unsaturated polyester resin and diluent. Therefore, when the aforementioned unsaturated polyester resin, cross-linkable curable diluent, glass fiber layer, free radical-generating curing agent, and other raw materials are composited, an integrated continuous composite structure (i.e., composite reinforcing material layer) with the advantages of being lightweight and high-strength can be formed. When combined with a thin film substrate, a continuous photovoltaic reinforcing sheet with the advantages of being lightweight and having excellent bending strength, impact strength, scratch resistance, wear resistance, 400-1100nm light transmittance, light transmittance after PCT48H (400-1100nm), resistance to PCT48H yellowing, and resistance to UV yellowing can be prepared. Moreover, the production efficiency of this continuous photovoltaic reinforcing sheet is high.

[0033] Using this continuous photovoltaic reinforcement sheet as a transparent front panel and transparent back panel of a photovoltaic module can replace the traditional photovoltaic glass in the photovoltaic module. This reduces the weight of the photovoltaic module while meeting the standard requirements for performance testing of the photovoltaic front panel and photovoltaic back panel, such as load testing. To a certain extent, it greatly expands the application scenarios of photovoltaic modules and is particularly suitable for use in ultra-thin and lightweight photovoltaic modules. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the cross-sectional structure of a continuous photovoltaic enhancement plate according to the present invention.

[0035] Reference numerals: 1. Thin film substrate; 2-1. Glass fiber layer; 2-2. Unsaturated polyester resin material. Detailed Implementation

[0036] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] Example 1

[0038] This embodiment describes a continuous photovoltaic enhancement panel, see [link / reference]. Figure 1The system comprises a thin film substrate 1 and a composite reinforcing material layer. The thin film substrate 1 is one of a polycarbonate (PC) film, a polyethylene terephthalate (PET) film, or a polymethyl methacrylate (PMMA) film, preferably a polyethylene terephthalate (PET) film. The thickness of the thin film substrate 1 is 0.15 mm to 0.31 mm, preferably 0.31 mm.

[0039] The composite reinforcing material layer is an integral continuous composite structure formed by impregnating unsaturated polyester resin material 2-2 from one surface (such as the rear surface) of glass fiber layer 2-1 to the other surface (such as the front surface) of glass fiber layer 2-1 and then curing it.

[0040] Among them, the glass fiber layer 2-1 is glass fiber cloth or glass fiber mat. The unsaturated polyester resin material 2-2 is prepared by mixing and stirring unsaturated polyester resin matrix, curing agent, ultraviolet absorber, hydrolysis resistant agent and diluent, and then curing at high temperature.

[0041] The viscosity of the unsaturated polyester resin matrix is ​​200-250 cps (25℃), and the type is one or more of orthophthalic unsaturated polyester resin, isophthalic unsaturated polyester resin, terephthalic unsaturated polyester resin, bisphenol A unsaturated polyester resin or vinyl unsaturated polyester resin, preferably terephthalic unsaturated polyester resin.

[0042] The curing agent is a curing agent that can generate free radicals, specifically one or more of tert-butyl peroxide (TBPB), benzoyl peroxide (BPO), or cyclohexanone peroxide (CHP), preferably BPO.

[0043] The ultraviolet absorber is one of UV-329, UV-P, UV-328 or UV-571, preferably UV-P.

[0044] The hydrolysis resistant agent is polycarbodiimide (PCD).

[0045] The diluent is methyl methacrylate (MMA) and / or polyethylene glycol diacrylate (PEGDA), preferably MMA and PEGDA. The molecular weight of PEGDA is 250-10000, for example 250, 1000, 6000 or 10000, preferably 250.

[0046] Among them, the unsaturated polyester resin material 2-2, by weight, has the following raw material formula:

[0047] 90-98 parts of unsaturated polyester resin matrix

[0048] 1-5 parts of curing agent

[0049] 0.5-2 parts of ultraviolet absorber

[0050] Hydrolysis resistant agent 0.5-3 parts

[0051] Diluent 1-4 parts.

[0052] In the continuous photovoltaic enhancement panel of this embodiment, the unsaturated polyester resin used in the unsaturated polyester resin material 2-2 has the advantage of low price and low viscosity, which gives it good wettability with glass fiber cloth or glass fiber mat. The wetting speed of the low-viscosity unsaturated polyester resin is significantly better than that of other resins (such as polyurethane, acrylic resin, epoxy resin, etc.). Moreover, this wettability is further enhanced by the addition of a low-viscosity, cross-linkable curable diluent (i.e., methyl methacrylate and / or polyethylene glycol diacrylate), which allows the unsaturated polyester resin to penetrate the glass fiber cloth or glass fiber mat in a very short time. Under the action of a curing agent that can generate free radicals, it is cured and formed in a short time, creating a macromolecular cross-linked network structure of glass fiber cloth or glass fiber mat impregnated with unsaturated polyester resin and diluent. Therefore, when unsaturated polyester resin, a cross-linkable curable diluent (preferably a mixture of MMA and PEGDA in a 1:1 mass ratio), glass fiber layer 2-1, a curing agent capable of generating free radicals, and other raw materials are composited, an integrated continuous composite structure (i.e., a composite reinforcing material layer) with the advantages of lightweight and high strength is formed. Combined with film substrate 1, a continuous photovoltaic reinforcing panel with the advantages of lightweight, and excellent bending strength, impact strength, scratch resistance, wear resistance, 400-1100nm light transmittance, light transmittance after PCT48H (400-1100nm), PCT48H yellowing resistance, and UV yellowing resistance can be prepared. Therefore, this continuous photovoltaic reinforcing panel effectively overcomes the problems of poor bending strength, poor scratch resistance, poor wear resistance, low light transmittance, and easy yellowing due to aging that exist in current lightweight photovoltaic panels.

[0053] This embodiment of a method for preparing a continuous photovoltaic enhancement board includes the following preparation steps:

[0054] 1. First, corona treatment is performed on the thin film substrate 1 at a power of 5000-15000W (preferably 10000W).

[0055] 2. The film substrate 1 is placed at the front end of an existing continuous machine-made board production line (e.g., the machine-made board production line of Changli County Tiantuo Machinery Equipment Co., Ltd.).

[0056] 3. Place the fiberglass cloth or fiberglass mat on the air shaft of the continuous machine-made board production line.

[0057] 4. Weigh each raw material according to the raw material formula of the unsaturated polyester resin material, and mix and stir them evenly for later use.

[0058] 5. Pour the unsaturated polyester resin material into the resin tank reserved in the continuous machine-made board production line.

[0059] 6. Connect the power supply to the continuous machine-made board production line, lay the film substrate 1 flat on the surface of the conveyor belt of the continuous machine-made board production line, and the film substrate 1 moves forward at a speed of 5-10m / min (e.g., 7m / min) under the traction of the continuous machine-made board production line.

[0060] 7. When the film substrate 1 is conveyed to the unsaturated polyester resin material, the unsaturated polyester resin 2-2 with a thickness of 0.30mm-0.7mm (preferably 0.40mm) is precisely applied to the surface of the film substrate 1 by the scraper of the continuous mechanical plate production line.

[0061] 8. The glass fiber cloth or glass fiber mat on the air expansion shaft is laid in the unsaturated polyester resin material 2-2 through the automatic unwinding device. Since the viscosity of the unsaturated polyester resin material 2-2 is low, the unsaturated polyester resin material 2-2 can quickly impregnate the glass fiber cloth or glass fiber mat.

[0062] 9. The thickness of the continuous photovoltaic reinforcing panel after laying glass fiber cloth or glass fiber mat is adjusted by controlling the gap between the paint roller and the metering roller, and then cured and molded to obtain a continuous photovoltaic reinforcing panel product with a thickness of 0.30mm-1.01mm (preferably 0.80mm).

[0063] 10. Then, it is placed in an oven at 120-150℃ for 3-5 minutes to cure (for example, 135℃ for 4 minutes). After curing, the release film is removed and the continuous photovoltaic enhancement board is rolled up.

[0064] The existing integrated fiberglass reinforced photovoltaic panel (CN115230263A) uses a heated lamination process for molding. This process requires the use of molds, and the size of the molds must be designed strictly according to the product size. Otherwise, the produced products will be non-compliant. At the same time, when using molds for curing, only one product can be made at a time, resulting in low production efficiency and making it unsuitable for the current requirements of rapid industrialization.

[0065] The continuous photovoltaic enhancement panel of this embodiment can greatly improve production efficiency and reduce costs through the above-mentioned continuous flat panel production process.

[0066] This embodiment describes the application of a continuous photovoltaic (PV) reinforcement sheet, specifically, using this continuous PV reinforcement sheet as the transparent front and back panels of a PV module to replace traditional PV glass. This reduces the weight of the PV module while meeting the standard requirements for performance testing of the PV front and back panels, such as load testing. This significantly expands the application scenarios of PV modules, making it particularly suitable for ultra-thin and lightweight PV modules.

[0067] Example 2

[0068] This embodiment describes a continuous photovoltaic enhancement panel (such as...). Figure 1 The preparation method and application of the above (as shown) are all based on Example 1. The difference between this example and Example 1 is that:

[0069] The unsaturated polyester resin material 2-2 in this embodiment, by weight, has the following raw material formula:

[0070]

[0071] Example 3

[0072] This embodiment describes a continuous photovoltaic enhancement panel (such as...). Figure 1 The preparation method and application of the above (as shown) are all based on Example 2. The difference between this example and Example 2 is that:

[0073] In this embodiment, the unsaturated polyester resin material 2-2 contains 1.5 parts BPO and 0.5 parts CHP. The remaining raw materials and their weight proportions are the same as in Example 2.

[0074] Example 4

[0075] This embodiment describes a continuous photovoltaic enhancement panel (such as...). Figure 1 The preparation method and application of the above (as shown) are all based on Example 2. The difference between this example and Example 2 is that:

[0076] In this embodiment, UV-P is 1.0 part in the unsaturated polyester resin material 2-2, and the remaining raw materials and weight parts are the same as in Example 2.

[0077] Example 5

[0078] This embodiment describes a continuous photovoltaic enhancement panel (such as...). Figure 1 The preparation method and application of the above (as shown) are all based on Example 2. The difference between this example and Example 2 is that:

[0079] In this embodiment, the unsaturated polyester resin material 2-2 has a PCD content of 2.0 parts, and the remaining raw materials and weight parts are the same as in Example 2.

[0080] Example 6

[0081] This embodiment describes a continuous photovoltaic enhancement panel (such as...). Figure 1 The preparation method and application of the above (as shown) are all based on Example 2. The difference between this example and Example 2 is that:

[0082] In this embodiment, the unsaturated polyester resin material 2-2 has a molecular weight of PEGDA of 1000. The raw materials and weight parts of this unsaturated polyester resin material 2-2 are the same as those in Example 2.

[0083] Example 7

[0084] This embodiment describes a continuous photovoltaic enhancement panel (such as...). Figure 1 The preparation method and application of the above (as shown) are all based on Example 2. The difference between this example and Example 2 is that:

[0085] In this embodiment, the unsaturated polyester resin material 2-2 has a molecular weight of 6000 for PEGDA. The raw materials and weight parts of this unsaturated polyester resin material 2-2 are the same as those in Example 2.

[0086] Example 8

[0087] This embodiment describes a continuous photovoltaic enhancement panel (such as...). Figure 1 The preparation method and application of the above (as shown) are all based on Example 2. The difference between this example and Example 2 is that:

[0088] In this embodiment, the unsaturated polyester resin material 2-2 has a molecular weight of PEGDA of 10,000. The raw materials and weight parts of this unsaturated polyester resin material 2-2 are the same as those in Example 2.

[0089] Comparative Example 1

[0090] This comparative example of a photovoltaic enhancement board, its preparation method, and its application are all based on Example 2. The difference between this comparative example and Example 2 is that:

[0091] In this comparative example, no 0.5 parts of UV-P were added to the unsaturated polyester resin material, and the remaining raw materials and weight parts were the same as in Example 2.

[0092] Comparative Example 2

[0093] This comparative example of a photovoltaic enhancement board, its preparation method, and its application are all based on Example 2. The difference between this comparative example and Example 2 is that:

[0094] In this comparative example, the unsaturated polyester resin material used does not contain 1.5 parts PCD, and the remaining raw materials and weight parts are the same as in Example 2.

[0095] Comparative Example 3

[0096] This comparative example of a photovoltaic enhancement board, its preparation method, and its application are all based on Example 2. The difference between this comparative example and Example 2 is that:

[0097] In this comparative example, the unsaturated polyester resin material used does not contain 2 parts MMA, and the remaining raw materials and weight parts are the same as in Example 2.

[0098] Comparative Example 4

[0099] This comparative example of a photovoltaic enhancement board, its preparation method, and its application are all based on Example 2. The difference between this comparative example and Example 2 is that:

[0100] In this comparative example, the unsaturated polyester resin material used did not contain 2 parts of PEGDA, and the remaining raw materials and weight parts were the same as in Example 2.

[0101] Comparative Example 5

[0102] This comparative example of a photovoltaic enhancement board, its preparation method, and its application are all based on Example 2. The difference between this comparative example and Example 2 is that:

[0103] In the preparation method of the photovoltaic enhancement board in this comparative example, the thin film substrate does not undergo the corona treatment in step 1, and the remaining preparation steps and the raw material formulation of the unsaturated polyester resin material are the same as in Example 2.

[0104] Performance testing

[0105] The performance of the continuous photovoltaic reinforced panels prepared in Examples 2-8 and Comparative Examples 1-5 was tested, and the test results are shown in Table 1 below:

[0106]

[0107]

[0108]

[0109] As shown in Table 1:

[0110] As can be seen from Examples 2-8, the continuous photovoltaic reinforced sheet of the present invention has good bending strength, impact strength, light transmittance of 400-1100nm, light transmittance after PCT48H (400-1100nm), resistance to PCT48H yellowing, and resistance to UV yellowing, which meet the high-quality requirements of the photovoltaic industry. In addition, the continuous photovoltaic reinforced sheet of the present invention has good scratch resistance (or abrasion resistance) and good hardness, thus having good wear resistance.

[0111] As can be seen from Comparative Example 1, Example 2 and Example 4, the addition of UV-P to unsaturated polyester resin material 2-2 can significantly improve the UV yellowing resistance of the board; however, excessive addition of UV-P will lead to a decrease in the light transmittance of the board at 400-1100nm, the light transmittance after PCT48H, the impact strength and scratch resistance.

[0112] As can be seen from Comparative Example 2, Example 2 and Example 5, the addition of PCD can improve the hydrolysis resistance of the board, thus improving the resistance to PCT48H yellowing, scratch resistance and hardness, and making the board more wear-resistant.

[0113] As can be seen from Example 2 and Comparative Example 3, the addition of diluent MMA to diluent PEGDA can effectively improve the overall performance of the board, especially greatly improving the light transmittance of the board at 400-1100nm, the light transmittance after PCT48H (400-1100nm), and the scratch resistance.

[0114] As can be seen from Comparative Example 4, Example 2, Example 6, Example 7, and Example 8, the addition of PEGDA to MMA can significantly improve the flexural strength and impact strength of the sheet, and effectively enhance its scratch resistance and hardness, thus giving the sheet excellent scratch resistance and abrasion resistance. Furthermore, the flexural strength and impact strength of the sheet increase with the increase of PGEDA molecular weight, indicating that the sheet has good rigidity. This is because MMA, PGEDA, and the unsaturated polyester resin matrix can cross-link and cure each other under the action of a curing agent to form a network structure. This cross-linked network structure greatly enhances the flexural strength and impact strength of the backing plate.

[0115] As can be seen from Example 2, Comparative Example 4, and Comparative Example 5,

[0116] As can be seen from Example 2 and Comparative Example 5, corona treatment of the thin film substrate can improve the delamination phenomenon of the board.

[0117] In summary, considering the bending strength, impact strength, 400-1100nm transmittance, transmittance after PCT48H (400-1100nm), PCT48H yellowing resistance, UV yellowing resistance, scratch resistance, and abrasion resistance of the continuous photovoltaic reinforced sheet, the raw material formulation in Example 2 of this invention has the best overall performance.

[0118] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the embodiments of the present invention.

[0119] The technical solution provided by the present invention has been described in detail above. Specific examples have been used to illustrate the principle and implementation of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A continuous photovoltaic enhancement panel, characterized in that, It comprises a thin film substrate and a composite reinforcing material layer; the composite reinforcing material layer is an integral continuous composite structure formed by impregnating unsaturated polyester resin material from one surface of a glass fiber layer to the other surface of the glass fiber layer and then curing it. The glass fiber layer is glass fiber cloth or glass fiber mat; The unsaturated polyester resin material, by weight, has the following raw material formula: 90-98 parts of unsaturated polyester resin matrix 1-5 parts of curing agent 0.5-2 parts of ultraviolet absorber Hydrolysis resistant agent 0.5-3 parts 1-4 parts diluent; The curing agent is a curing agent capable of generating free radicals; the diluent is a mixture of methyl methacrylate and polyethylene glycol diacrylate in a mass ratio of 1:1; and the molecular weight of PEGDA is 250-10000. The viscosity of the unsaturated polyester resin matrix at 25°C is 200-250 cps.

2. The continuous photovoltaic enhancement sheet according to claim 1, characterized in that, The molecular weight of the PEGDA is 250.

3. The continuous photovoltaic enhancement sheet according to claim 1, characterized in that, The curing agent is one or more of tert-butyl peroxide, benzoyl peroxide, or cyclohexanone peroxide.

4. The continuous photovoltaic enhancement sheet according to claim 1, characterized in that, The unsaturated polyester resin matrix is ​​one or more of the following: orthophthalic unsaturated polyester resin, isophthalic unsaturated polyester resin, terephthalic unsaturated polyester resin, bisphenol A unsaturated polyester resin, or vinyl unsaturated polyester resin.

5. A continuous photovoltaic enhancement sheet according to claim 1, characterized in that, The ultraviolet absorber is UV-329, UV-P, UV-328, or UV-571; the hydrolysis resistant agent is polycarbodiimide.

6. The continuous photovoltaic enhancement sheet according to claim 1, characterized in that, The film substrate is a polycarbonate film, a polyethylene terephthalate film, or a polymethyl methacrylate film.

7. A method for preparing a continuous photovoltaic enhancement panel according to any one of claims 1-6, characterized in that, The preparation steps include the following: S1. Corona treatment is applied to the thin film substrate; S2. According to the raw material formula, weigh the raw materials of unsaturated polyester resin material, mix and stir the raw materials evenly, and then pour the unsaturated polyester resin material into the resin tank of the continuous machine-made board production line. S3. Turn on the power and lay the film substrate flat on the surface of the conveyor belt of the continuous machine-made board production line, so that the film substrate moves forward at a certain speed under the traction of the continuous machine-made board production line. S4. When the film substrate is conveyed to the unsaturated polyester resin material, the unsaturated polyester resin material in the resin tank is applied to the surface of the film substrate by a scraper. S5. Automatically unwind the glass fiber layer and lay it into the unsaturated polyester resin material on the surface of the film substrate, so that the unsaturated polyester resin material permeates the entire glass fiber layer. S6. Then roll forming and curing are performed to obtain a continuous photovoltaic reinforced sheet.

8. The method for preparing a continuous photovoltaic enhancement plate according to claim 7, characterized in that, In step S1, the power of the corona treatment is 5000-15000W; In step S3, the forward speed of the thin film substrate is 5-10 m / min.

9. The method for preparing a continuous photovoltaic enhancement plate according to claim 7, characterized in that, In step S6, the curing temperature is 120-150℃ and the time is 3-5 minutes.

10. The application of a continuous photovoltaic enhancement panel according to any one of claims 1-6, characterized in that, Continuous photovoltaic enhancement sheets are used as transparent front and transparent back sheets for photovoltaic modules.

Images