Quasi-isotropic composite material, photovoltaic composite material and photovoltaic frame

Abstract

The invention relates to a quasi-isotropic composite material, a photovoltaic composite material and a photovoltaic frame, and belongs to the technical field of composite materials. The quasi-isotropic composite material comprises a long glass fiber skeleton and a resin matrix A; the long glass fiber framework comprises at least two layers of long glass fibers A, and each layer of long glass fibers A is arranged according to an equal regular angle. According to the invention, the long glass fibers are arranged according to the equal regular angles, and the mechanical properties of the composite material in the direction perpendicular to the long glass fibers and in different angle directions are enhanced on the basis of retaining the mechanical property advantages of the composite material in the reinforcing direction of the long glass fibers, so that the prepared composite material has the characteristic of quasi-isotropy.

Description

Technical Field

[0001] This invention relates to the field of composite material technology, and more particularly to a quasi-isotropic composite material, a photovoltaic composite material, and a photovoltaic frame. Background Technology

[0002] Solar power generation is a device that uses photovoltaic (PV) modules to directly convert solar energy into electrical energy. The PV module is the core and most important component of a solar power generation system. The overall structure of a PV module consists of a frame, solar photovoltaic glass mounted on the frame, solar cells (also called silicon wafers or silicon panels) located beneath the solar photovoltaic glass, a hot-melt adhesive layer, a junction box, and an insulating backsheet. Currently, existing frames are generally made of metal materials, especially aluminum alloys. However, aluminum frames generally have low connection strength and poor load-bearing capacity, which to some extent affects the performance of the solar photovoltaic module.

[0003] Currently, existing technologies also disclose solutions for improving the strength of frame materials by adding reinforcing glass fibers to the resin matrix (such as CN115863462A). However, due to the long glass fiber and resin blending-pultrusion preparation process used, the resulting frame material exhibits significant differences in mechanical properties in different directions. When installing with matching screw holes, the force direction is not completely consistent with the reinforcement direction, making it prone to tearing and delamination at the hole location, thus failing to completely replace aluminum alloy frames in various applications. Some manufacturers choose to add pressure blocks when installing with matching screw holes, which not only increases costs but also complicates the installation process, hindering the widespread application of photovoltaic composite materials and their adaptation to conventional usage scenarios.

[0004] Therefore, how to achieve an isotropic composite material has become an urgent problem to be solved. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a quasi-isotropic composite material, a photovoltaic composite material, and a photovoltaic frame. By arranging long glass fibers at equal and regular angles, the mechanical properties of the composite material are enhanced in the direction of the long glass fiber reinforcement, while also improving the mechanical properties of the composite material perpendicular to the direction of the long glass fiber and in different angle directions, thus giving the composite material quasi-isotropic characteristics.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] In a first aspect, the present invention provides a quasi-isotropic composite material, the quasi-isotropic composite material comprising a long glass fiber skeleton and a resin matrix A;

[0008] The long glass fiber skeleton comprises at least two layers of long glass fibers, and each layer of long glass fibers A is arranged at equal angles.

[0009] Because glass fiber is an axially isotropic cylinder with dense atomic arrangement and strong chemical bonds in the axial direction, it has high tensile modulus and strength. However, its radial atomic arrangement is sparse and chemical bonds are weak, resulting in significantly lower modulus and strength. During composite material molding, glass fibers are typically aligned in one direction, leading to anisotropy in different directions. Furthermore, the bonding strength between the resin matrix and glass fibers is limited, making interfacial debonding prone to occur, further exacerbating the anisotropy of the composite material. This invention provides a quasi-isotropic composite material containing a long glass fiber skeleton. By adjusting the orientation distribution of each layer of long glass fibers in the skeleton, with each layer arranged at equal angles, the resulting composite material exhibits quasi-isotropic properties.

[0010] The long glass fiber skeleton described in this invention comprises at least two layers of long glass fibers, such as two, three, four, five, or six layers, preferably four layers.

[0011] Wherein, when the long glass fiber skeleton comprises 2 layers of long glass fibers A, the orientation degree of each layer of long glass fibers A is 0° and 90°; when the long glass fiber skeleton comprises 3 layers of long glass fibers A, the orientation degree of each layer of long glass fibers A is 0°, 60° and 120°; when the long glass fiber skeleton comprises 4 layers of long glass fibers A, the orientation degree of each layer of long glass fibers A is 0°, 90°, 45° and -45°, or it can be 60°, 15°, -75° and -30°; when the long glass fiber skeleton comprises 5 layers of long glass fibers A, the orientation degree of each layer of long glass fibers A is 0°, 36°, 72°, -18° and -54°; when the long glass fiber skeleton comprises 6 layers of long glass fibers A, the orientation degree of each layer of long glass fibers A is 0°, 30°, 60°, 90°, -30° and -60°; or other arrangements with the same angle difference as the above angles. In this invention, the orientation of each layer of long glass fiber A is based on the 0° reference of the production direction of the quasi-isotropic composite material.

[0012] Preferably, the linear density of the long glass fiber A is 1000-2400 Tex, for example, it can be 1000 Tex, 1200 Tex, 1400 Tex, 1500 Tex, 1600 Tex, 1800 Tex, 2000 Tex, 2200 Tex or 2400 Tex, etc.

[0013] Preferably, the resin matrix A includes any one or a combination of at least two of epoxy resin, polyurethane resin, acrylic resin, or vinyl resin.

[0014] Preferably, the degree of crosslinking of the quasi-isotropic composite material is 30-80%, for example, it can be 30%, 40%, 50%, 60%, 70% or 80%, etc., preferably 40%.

[0015] The present invention preferably uses a crosslinking degree of 40% for the quasi-isotropic composite material. If the degree of crosslinking is lower than this, the surface viscosity of the quasi-isotropic material will be high, which is not conducive to subsequent cutting. If the degree of crosslinking is higher than this, there may be a risk of delamination after the quasi-isotropic material and the resin matrix B are crosslinked and cured.

[0016] Preferably, the quasi-isotropic composite material further includes short glass fibers.

[0017] Preferably, the short glass fibers are mixed in resin matrix A.

[0018] Preferably, the short glass fiber has a length of 1-5 mm, for example, it can be 1 mm, 2 mm, 3 mm, 4 mm or 5 mm, etc.

[0019] Preferably, the diameter of the short glass fiber is 5-15 mm, for example, it can be 5 mm, 6 mm, 8 mm, 10 mm, 12 mm, 14 mm or 15 mm, etc.

[0020] Preferably, the outermost side of the quasi-isotropic composite material is provided with glass fiber mat A.

[0021] Preferably, the glass fiber mat A comprises continuous glass fiber mat and / or chopped glass fiber mat.

[0022] Preferably, the weight of the glass fiber mat A is 200-500 g / m. 2 For example, it could be 200 g / m 2 300 g / m 2 400 g / m 2 Or 500 g / m 2 wait.

[0023] Preferably, the quasi-isotropic composite material comprises, by mass percentage, 30-90% long glass fiber A, 0.01-30% short glass fiber, 0.01-30% glass fiber mat A, and 9-40% resin matrix A.

[0024] Among them, "30-90%" can be 30%, 40%, 50%, 60%, 70%, 80% or 90%, etc., "0.01-30%" can be 0.01%, 5%, 10%, 15%, 20%, 25% or 30%, etc., and "9-40%" can be 9%, 10%, 15%, 20%, 25%, 30%, 35% or 40%, etc.

[0025] Preferably, the quasi-isotropic composite material comprises, by mass percentage, 60% long glass fiber A, 10% short glass fiber, 10% glass fiber mat A, and 20% resin matrix A.

[0026] In a second aspect, the present invention provides a method for preparing a quasi-isotropic composite material as described in the first aspect, the method comprising the following steps:

[0027] (1) The long glass fiber A is pulled and arranged to obtain a long glass fiber skeleton;

[0028] (2) The long glass fiber skeleton, optionally short glass fiber, and resin matrix B are mixed and molded to obtain the quasi-isotropic composite material.

[0029] This invention uses a traction machine to pull and arrange long glass fibers A to obtain a long glass fiber skeleton.

[0030] Preferably, the mixing temperature in step (2) is the melting temperature of the resin matrix A used.

[0031] Preferably, the molding temperature in step (2) is 200-300℃, for example, 200℃, 220℃, 240℃, 260℃, 280℃ or 300℃, and the time is 10-200 s, for example, 10 s, 50 s, 100 s, 150 s or 200 s.

[0032] Preferably, the molding process includes pultrusion molding, compression molding, or in-mold injection molding.

[0033] Preferably, the preparation method further includes wrapping glass fiber mat A before molding.

[0034] The quasi-isotropic composite material provided by this invention is prepared by uniformly wrapping glass fiber mat on the profile along the molding direction. After curing, when preparing photovoltaic composite materials, the glass fiber mat, as the outer layer of fiber reinforcement material, is simultaneously impregnated with resin. The final photovoltaic composite material is mainly composed of a resin layer.

[0035] When the quasi-isotropic composite material provided by the present invention includes short glass fibers, step (2) is to first mix the short glass fibers with the resin matrix A, and then add the long glass fiber skeleton for mixing.

[0036] When the quasi-isotropic composite material provided by this invention contains short glass fibers or coated glass fiber mats, since the long glass fibers are basically continuous long fibers, the material after being impregnated with resin is equivalent to a continuous material, and its anisotropic mechanical properties are enhanced on the basis of long fibers. However, the fibers in short glass fibers and glass fiber mats are mostly short fibers, which only enhance the mechanical properties of the existing resin and do not play a role in improving the mechanical properties of long fibers. Although adding short fibers to continuous long fibers can improve the isotropy of the material, short fibers may be stress concentration points and are more prone to microcracks, which will lead to a decrease in the mechanical properties of the material.

[0037] Thirdly, the present invention provides a photovoltaic composite material, the composite material comprising the quasi-isotropic composite material as described in the first aspect and a resin matrix B.

[0038] Preferably, each of the resin matrices B independently comprises any one or a combination of at least two of epoxy resin, polyurethane resin, acrylic resin, or vinyl resin.

[0039] Preferably, the photovoltaic composite material further includes long glass fibers B.

[0040] Preferably, the linear density of the long glass fiber B is 1000-2400 Tex, for example, it can be 1000 Tex, 1200 Tex, 1400 Tex, 1500 Tex, 1600 Tex, 1800 Tex, 2000 Tex, 2200 Tex or 2400 Tex, etc.

[0041] Preferably, the outermost side of the photovoltaic composite material is provided with glass fiber mat B.

[0042] Preferably, the glass fiber mat B comprises continuous glass fiber mat and / or chopped glass fiber mat.

[0043] Preferably, the weight of the glass fiber mat B is 200-500 g / m. 2 For example, it could be 200 g / m 2 300 g / m 2 400 g / m 2 Or 500 g / m 2 wait.

[0044] Preferably, the photovoltaic composite material comprises, by mass percentage, 40-80% quasi-isotropic composite material, 1-20% long glass fiber B, 1-10% glass fiber mat B, and 10-30% resin matrix B.

[0045] Among them, "40-80%" can be 40%, 50%, 60%, 65%, 70%, 75%, or 80%, etc.; "1-20%" can be 1%, 5%, 10%, 15%, or 20%, etc.; "1-10%" can be 1%, 2%, 4%, 5%, 6%, 8%, or 10%, etc.; and "10-30%" can be 10%, 15%, 20%, 25%, or 30%, etc.

[0046] Preferably, the photovoltaic composite material comprises, by mass percentage, 60% quasi-isotropic composite material, 10% long glass fiber B, 5% glass fiber mat B, and 25% resin matrix B.

[0047] Preferably, the resin matrix A is the same as the resin matrix B.

[0048] In this invention, resin matrix A and resin matrix B are made of the same resin matrix, which makes the quasi-isotropic composite material and resin matrix A have excellent compatibility and improves the isotropy of the photovoltaic composite material.

[0049] Fourthly, the present invention provides a method for preparing a photovoltaic composite material as described in the third aspect, the method comprising the following steps:

[0050] The photovoltaic composite material is obtained by mixing and molding the quasi-isotropic composite material as described in the first aspect, optionally long glass fiber B, and resin matrix B.

[0051] Preferably, the mixing temperature is the melting temperature of the resin matrix B used.

[0052] Preferably, the molding temperature is 200-300℃, for example, 200℃, 220℃, 240℃, 260℃, 280℃ or 300℃, and the time is 100-600 s, for example, 100 s, 200 s, 300 s, 400 s, 500 s or 600 s.

[0053] Preferably, the preparation method further includes wrapping glass fiber mat B before molding.

[0054] Preferably, the molding process includes pultrusion molding, compression molding, or in-mold injection molding.

[0055] Fifthly, the present invention provides a photovoltaic frame including at least one reinforcing surface, the reinforcing surface comprising a photovoltaic composite material as described in the fourth aspect.

[0056] Preferably, the unreinforced surface of the photovoltaic frame comprises, by weight percentage, 60-90% long glass fiber (C) and 10-40% resin matrix (C).

[0057] Preferably, the resin matrix C includes any one or a combination of at least two of epoxy resin matrix, polyurethane resin, acrylic resin or vinyl resin matrix.

[0058] Preferably, the linear density of the long glass fiber C is 1000-2400 Tex, for example, it can be 1000 Tex, 1200 Tex, 1400 Tex, 1500 Tex, 1600 Tex, 1800 Tex, 2000 Tex, 2200 Tex or 2400 Tex, etc.

[0059] The photovoltaic composite material provided by this invention can be used as a material for the reinforcing surface of a photovoltaic frame. The reinforcing surface is usually the main load-bearing beam (B-side) and the mounting beam (C-side) of the photovoltaic frame.

[0060] The photovoltaic frame is obtained by assembling the reinforced surface and the non-reinforced surface, and the photovoltaic module is obtained by drilling holes in the reinforced surface or assembling it with single-glass, double-glass, non-glass, or other components using pressure blocks.

[0061] Compared with the prior art, the present invention has at least the following beneficial effects:

[0062] (1) By arranging long glass fibers at equal and regular angles, this invention retains the mechanical properties of the composite material in the direction of long glass fiber reinforcement while enhancing the mechanical properties of the composite material in the direction perpendicular to the long glass fiber and in different angle directions, so that the composite material has quasi-isotropic characteristics.

[0063] (2) The present invention provides a photovoltaic composite material containing quasi-isotropic composite material, wherein the glass fiber in the photovoltaic composite material has good compatibility with the resin matrix, and the photovoltaic composite material prepared has excellent long-term reliability.

[0064] (3) The photovoltaic composite material prepared by the present invention can be used as the reinforcing material of photovoltaic frame, and is compatible with single glass, double glass and non-glass modules. The photovoltaic modules assembled are not limited by the installation method, which solves the problems of tearing, delamination and poor strength of the frame when the photovoltaic module is installed by drilling, and improves the application range of photovoltaic frame. Detailed Implementation

[0065] The technical solution of the present invention will be further illustrated below through specific embodiments. However, the examples below are merely simplified examples of the present invention and do not represent or limit the scope of protection of the present invention. The scope of protection of the present invention is determined by the claims.

[0066] The specific information of the materials used in the following specific embodiments of the present invention is as follows:

[0067] Long glass fiber A and long glass fiber B were purchased from Taishan Glass Fiber Co., Ltd., model T911, linear density 2400Tex;

[0068] Short glass fiber, purchased from Taishan Glass Fiber Co., Ltd., model T436, length 3 mm, diameter 11 μm;

[0069] Fiberglass mat A and fiberglass mat B were purchased from Taishan Fiberglass Co., Ltd., model EMK450, weighing 450g / m. 2 ;

[0070] Polyurethane resin, model Urepul2112, purchased from Nanjing Jufeng New Materials Co., Ltd.

[0071] Epoxy resin, model WD3616, purchased from Nanjing Jufeng New Materials Co., Ltd.

[0072] Example 1

[0073] This embodiment provides a quasi-isotropic composite material, a photovoltaic composite material, and a method for preparing the same. The quasi-isotropic composite material comprises, by mass percentage, 60% long glass fiber A, 10% short glass fiber, 10% glass fiber mat A, and 20% polyurethane resin.

[0074] Long glass fibers A with orientations of 0°, 90°, 45°, and -45° constitute a long glass fiber skeleton with a 4-layer structure.

[0075] The photovoltaic composite material comprises, by weight percentage, 60% quasi-isotropic composite material, 10% long glass fiber B, 5% glass fiber mat B, and 25% polyurethane resin.

[0076] The quasi-isotropic composite material is prepared by the following preparation method, the preparation method comprising:

[0077] (1) The long glass fiber A is pulled and arranged according to the above orientation to obtain a long glass fiber skeleton;

[0078] (2) Short glass fibers are mixed with polyurethane resin (temperature 180°C), and then mixed with long glass fiber skeleton at the same temperature to obtain a premix. The surface of the premix is ​​covered with glass fiber felt A and then molded (molding temperature 220°C, molding time 100 s) to obtain the quasi-isotropic composite material with a crosslinking degree of 40%.

[0079] The photovoltaic composite material is prepared by the following preparation method, the preparation method comprising:

[0080] Quasi-isotropic composite material, long glass fiber B, and polyurethane resin are mixed (temperature 180°C) to obtain a premix. The surface of the premix is ​​coated with glass fiber mat B and then pultruded (molding temperature 240°C, molding time 300 s) to obtain the photovoltaic composite material.

[0081] The composite material for photovoltaics prepared in Example 1 of this invention has a longitudinal tensile strength of 840 MPa and a transverse tensile strength of 650 MPa. The difference between the longitudinal and transverse tensile strengths is only 22.6%, indicating excellent mechanical strength and quasi-isotropy.

[0082] Example 2

[0083] This embodiment provides a quasi-isotropic composite material, a photovoltaic composite material, and a method for preparing the same. The difference from Embodiment 1 is that the long glass fiber skeleton has 6 layers of long glass fibers A, and the orientation of each layer of long glass fibers A is 0°, 30°, 60°, 90°, -30°, and -60°.

[0084] The photovoltaic composite material prepared in Example 2 of this invention has a longitudinal tensile strength of 820 MPa and a transverse tensile strength of 580 MPa. The difference between the longitudinal and transverse tensile strengths is only 29.3%, indicating excellent mechanical strength and quasi-isotropy.

[0085] Example 3

[0086] This embodiment provides a quasi-isotropic composite material, a photovoltaic composite material, and a method for preparing the same. The difference from Embodiment 1 is that the long glass fiber skeleton has two layers of long glass fibers A, and the orientation of each layer of long glass fibers A is 0° and 90°.

[0087] The photovoltaic composite material prepared in Example 3 of this invention has a longitudinal tensile strength of 780 MPa and a transverse tensile strength of 580 MPa. The difference between the longitudinal and transverse tensile strengths is only 25.6%, indicating excellent mechanical strength and quasi-isotropy.

[0088] Example 4

[0089] This embodiment provides a quasi-isotropic composite material, a photovoltaic composite material and its preparation method, which differs from Embodiment 1 in that: the resin matrix A and resin matrix B are epoxy resin WD3616;

[0090] The quasi-isotropic composite material is prepared by the following preparation method, the preparation method comprising:

[0091] (1) The long glass fiber A is pulled and arranged according to the above orientation to obtain a long glass fiber skeleton;

[0092] (2) Short glass fibers are mixed with epoxy resin WD3616 (temperature 160℃), and then mixed with long glass fiber skeleton at the same temperature to obtain a premix. The surface of the premix is ​​covered with glass fiber mat A and then molded (molding temperature 220℃, molding time 100 s) to obtain the quasi-isotropic composite material with a crosslinking degree of 40%.

[0093] The photovoltaic composite material is prepared by the following preparation method, the preparation method comprising:

[0094] Quasi-isotropic composite material, long glass fiber B, and epoxy resin are mixed (temperature 160°C) to obtain a premix. The surface of the premix is ​​coated with glass fiber mat B and then pultruded (molding temperature 220°C, molding time 380 s) to obtain the photovoltaic composite material.

[0095] The photovoltaic composite material prepared in Example 4 of this invention has a longitudinal tensile strength of 650 MPa and a transverse tensile strength of 450 MPa. The difference between the longitudinal and transverse tensile strengths is only 30.8%, indicating excellent mechanical strength and quasi-isotropy.

[0096] Comparative Example 1

[0097] This comparative example provides a photovoltaic composite material and its preparation method, wherein the photovoltaic composite material comprises, by mass percentage, 70% long glass fiber A, 5% glass fiber mat A, and 25% polyurethane resin;

[0098] The photovoltaic composite material is prepared by the following preparation method, the preparation method comprising:

[0099] Long glass fiber A and polyurethane resin were mixed (180°C) to obtain a premix. The surface of the premix was coated with glass fiber mat A and then pultruded (molding temperature 240°C, molding time 300 s) to obtain the photovoltaic composite material.

[0100] The photovoltaic composite material prepared in Comparative Example 1 of this invention has a longitudinal tensile strength of 890 MPa and a transverse tensile strength of only 50 MPa. The difference between the longitudinal and transverse tensile strengths is 94.3%, indicating that the material does not have quasi-isotropy.

[0101] Comparative Example 2

[0102] This comparative example provides a photovoltaic composite material and its preparation method. The photovoltaic composite material comprises, by mass percentage, 60% long glass fiber A, 10% short glass fiber, 10% glass fiber mat A, and 20% polyurethane resin.

[0103] The photovoltaic composite material is prepared by the following preparation method, the preparation method comprising:

[0104] Short glass fibers and polyurethane resin are mixed (180°C), and then mixed with long glass fibers A (which exist disordered in the photovoltaic composite material) at the same temperature to obtain a premix. The surface of the premix is ​​coated with glass fiber mat A and then pultruded (molding temperature is 240°C, molding time is 300 s) to obtain the photovoltaic composite material.

[0105] The photovoltaic composite material prepared in Comparative Example 2 of this invention has a longitudinal tensile strength of 860 MPa and a transverse tensile strength of only 70 MPa. The difference between the longitudinal and transverse tensile strengths is 91.8%, indicating that the material does not have quasi-isotropy.

[0106] Comparative Example 3

[0107] This comparative example provides a photovoltaic composite material and its preparation method. The difference from Example 1 is that the long glass fiber skeleton has only a single layer of long glass fiber A, and the orientation degree of the long glass fiber A is 0°, which is the same as that in Example 1.

[0108] Comparative Example 4

[0109] This comparative example provides a photovoltaic composite material as provided in Example 1 of CN115625909A.

[0110] Test methods

[0111] The photovoltaic composite materials provided in Examples 1-4 and Comparative Examples 1-4 were subjected to the following performance tests:

[0112] Tensile strength: Refer to GB / T 1447-2005 "Test Method for Tensile Properties of Fiber Reinforced Plastics" and use Type II specimen for testing.

[0113] The continuous production direction of photovoltaic composite materials is longitudinal, and the direction perpendicular to the longitudinal direction is transverse.

[0114] Crosslinking degree: The crosslinking degree of crosslinked epoxy resin was determined according to GB / T 41928-2022 "Determination of crosslinking degree of crosslinked epoxy resin by differential scanning calorimetry (DSC)".

[0115] The test results are shown in Table 1 below:

[0116] Table 1

[0117]

[0118] The test results show that:

[0119] (1) As can be seen from Examples 1 to 3, by adjusting the raw materials and preparation process of the photovoltaic composite material, the photovoltaic composite material prepared in Examples 1-3 of the present invention has the characteristics of quasi-isotropic, and the difference between the longitudinal tensile strength and the transverse tensile strength of the material is less than 30%.

[0120] (2) As can be seen from Examples 1 and 2-3, Example 1 of the present invention can achieve better isotropic technical effect by further optimizing the number of layers of long glass fiber skeleton to 4 layers.

[0121] (3) As can be seen from Examples 1 and 4, the present invention preferably uses polyurethane resin as the matrix resin, which has better compatibility with glass fiber materials, and the resulting photovoltaic composite material has better quasi-isotropic mechanical properties.

[0122] (4) As can be seen from Example 1 and Comparative Examples 1-2, compared with the existing technology of directly using the long glass fiber and resin blending-pultrusion preparation process, the photovoltaic composite material provided in Example 1 of the present invention has the characteristics of quasi-isotropy.

[0123] (5) As can be seen from Example 1 and Comparative Example 3, when the long glass fiber A in the quasi-isotropic composite material does not have a multilayer ordered arrangement structure, it cannot exhibit the characteristics of quasi-isotropic.

[0124] (6) As can be seen from Example 1 and Comparative Example 4, compared with the photovoltaic module frame provided in the prior art, although it has better longitudinal tensile strength, its transverse tensile strength is much different. When the force direction is not completely consistent with the reinforcement direction, it is more likely to cause tearing and delamination.

[0125] The applicant declares that the above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention fall within the protection and disclosure scope of the present invention.

Claims

1. A quasi-isotropic composite material, characterized in that, The quasi-isotropic composite material comprises a long glass fiber skeleton and a resin matrix A; The long glass fiber skeleton comprises at least two layers of long glass fibers A, and each layer of long glass fibers A is arranged at equal angles.

2. The quasi-isotropic composite material according to claim 1, characterized in that, The linear density of the long glass fiber A is 1000-2400 Tex; Preferably, the resin matrix A comprises any one or a combination of at least two of epoxy resin, polyurethane resin, acrylic resin or vinyl resin; Preferably, the degree of crosslinking of the quasi-isotropic composite material is 30-80%.

3. The quasi-isotropic composite material according to claim 1 or 2, characterized in that, The resin matrix A also includes short glass fibers; Preferably, the short glass fiber has a length of 1-5 mm; Preferably, the diameter of the short glass fiber is 5-15 mm; Preferably, the outermost side of the quasi-isotropic composite material is provided with glass fiber mat A; Preferably, the glass fiber mat A comprises continuous glass fiber mat and / or chopped glass fiber mat; Preferably, the weight of the glass fiber mat A is 200-500 g / m. 2 ; Preferably, the quasi-isotropic composite material comprises, by mass percentage, 30-90% long glass fiber A, 0.01-30% short glass fiber, 0.01-30% glass fiber mat A, and 9-40% resin matrix A.

4. A method for preparing a quasi-isotropic composite material as described in any one of claims 1-3, characterized in that, The preparation method includes the following steps: (1) The long glass fiber A is pulled and arranged to obtain a long glass fiber skeleton; (2) The long glass fiber skeleton, optionally short glass fiber, and resin matrix B are mixed and molded to obtain the quasi-isotropic composite material.

5. The quasi-isotropic composite material according to claim 4, characterized in that, The molding temperature in step (2) is 200-300℃, and the molding time is 10-200 s; Preferably, the preparation method further includes wrapping glass fiber mat A before molding.

6. A composite material for photovoltaic applications, characterized in that, The composite material includes the quasi-isotropic composite material as described in any one of claims 1-3 and the resin matrix B.

7. The photovoltaic composite material according to claim 6, characterized in that, Each of the resin matrices B independently comprises any one or a combination of at least two of epoxy resin, polyurethane resin, acrylic resin, or vinyl resin. Preferably, the photovoltaic composite material further includes long glass fibers B; Preferably, the linear density of the long glass fiber B is 1000-2400 Tex; Preferably, the outermost side of the photovoltaic composite material is provided with glass fiber mat B; Preferably, the glass fiber mat B comprises continuous glass fiber mat and / or chopped glass fiber mat; Preferably, the weight of the glass fiber mat B is 200-500 g / m. 2 ; Preferably, the photovoltaic composite material comprises, by mass percentage, 40-80% quasi-isotropic composite material, 1-20% long glass fiber B, 1-10% glass fiber mat B, and 10-30% resin matrix B.

8. A method for preparing a photovoltaic composite material as described in claim 6 or 7, characterized in that, The preparation method includes the following steps: The photovoltaic composite material is obtained by mixing and molding the quasi-isotropic composite material as described in any one of claims 1-3, optionally long glass fiber B, and resin matrix B.

9. The preparation method according to claim 8, characterized in that, The molding temperature is 200-300℃, and the molding time is 100-600 s; Preferably, the preparation method further includes wrapping glass fiber mat B before molding.

10. A photovoltaic frame, characterized in that, The photovoltaic frame includes at least one reinforcing surface, the reinforcing surface being a photovoltaic composite material as described in claim 6 or 7.

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