Glass fiber prepreg as well as preparation method and application thereof

Abstract

The invention relates to a glass fiber prepreg as well as a preparation method and application thereof. The glass fiber prepreg comprises modified glass fiber cloth and a resin matrix; the mass percentage content of the modified glass fiber cloth is 55%-65% and the mass percentage content of the resin matrix is 35%-45% by taking the mass percentage content of the glass fiber prepreg as 100%; the preparation raw materials of the modified glass fiber cloth comprise amino-modified glass fiber cloth, benzophenone and a polymeric monomer; the polymeric monomer comprises acrylic acid and / or maleic anhydride. The glass fiber cloth is subjected to surface treatment, so that the surface chemical property and physical structure of the glass fiber cloth are improved, the wettability of the glass fiber cloth and a resin matrix is improved, the interface bonding strength of the glass fiber cloth and the resin matrix is remarkably improved, and finally the mechanical property and durability of the composite material are improved.

Description

Technical Field

[0001] This invention relates to the field of polymer materials technology, and in particular to a glass fiber prepreg, its preparation method, and its application. Background Technology

[0002] Interfacial bonding strength is a key indicator of glass fiber prepregs, directly determining the mechanical properties, durability, and processing reliability of the composite material. Improving interfacial bonding strength is a crucial technological approach for preparing high-performance glass fiber prepregs.

[0003] For example, CN115891329A discloses a lightweight backing plate for glass fiber reinforced polyurethane composite materials. Pre-impregnation of glass fibers improves the interfacial bonding strength between the fiber and resin, ensuring the overall mechanical strength of the composite material. CN117550816A discloses a glass fiber impregnating agent. Glass fiber yarns produced using this agent exhibit high tensile strength, high interfacial bonding strength, and high-temperature stability; moreover, the yarns have good smoothness, low fuzziness, and excellent compatibility with epoxy resin. CN117774387A discloses a production process for plastic pre-impregnated fiber mats. Surface modification of ultrafine glass fibers enhances their bonding strength with resin, thereby improving the strength and durability of the pre-impregnated fiber mat.

[0004] Current technologies suffer from drawbacks such as low interfacial bonding strength between glass fiber cloth and resin matrix, and low transmittance of glass fiber prepreg. Therefore, developing a glass fiber prepreg with high interfacial bonding strength and high transmittance has become an urgent problem to be solved. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a glass fiber prepreg, its preparation method, and its application. By surface-treating the glass fiber cloth, its surface chemical properties and physical structure are improved, enhancing the wettability between the glass fiber cloth and the resin matrix, significantly increasing the interfacial bonding strength between the glass fiber cloth and the resin matrix, and ultimately improving the mechanical properties and durability of the composite material.

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

[0007] In a first aspect, the present invention provides a glass fiber prepreg comprising modified glass fiber cloth and a resin matrix; based on the mass percentage of the glass fiber prepreg being 100%, the mass percentage of the glass fiber cloth is 55%-65% (e.g., 56%, 57%, 58%, 59%, 60%, 61%, 62%, 63%, or 64%, etc.), and the mass percentage of the resin matrix is ​​35%-45% (e.g., 36%, 37%, 38%, 39%, 40%, 41%, 42%, 43%, or 44%, etc.); the raw materials for preparing the modified glass fiber cloth include amino-modified glass fiber cloth, benzophenone, and polymeric monomers; the polymeric monomers include acrylic acid and / or maleic anhydride.

[0008] In this invention, under the initiation of benzophenone and ultraviolet light irradiation, the double bonds of acrylic acid open, and a free radical graft polymerization reaction occurs on the surface of the glass fiber, introducing carboxyl groups onto the glass fiber surface. The amino groups on the surface of the amino-modified glass fiber cloth can react with maleic anhydride, increasing the content of carboxyl and / or anhydride groups on the surface of the glass fiber cloth. The carboxyl and / or anhydride groups can form chemical bonds, hydrogen bonds, and other interactions with the resin matrix, thereby improving the compatibility between the glass fiber and the resin matrix.

[0009] Preferably, the raw materials for preparing the modified glass fiber cloth include the following components in parts by weight: 100 parts of amino-modified glass fiber cloth, 3-6 parts of photosensitizer, and 15-30 parts of polymer monomer.

[0010] The photosensitizer is present in 3-6 parts by weight, for example, 3.5 parts, 4 parts, 4.5 parts, 5 parts or 5.5 parts, etc.

[0011] The polymer monomer is in the form of 15-30 parts by weight, for example, 17 parts, 20 parts, 23 parts, 25 parts or 28 parts, etc.

[0012] Preferably, the photosensitizer includes any one or a combination of at least two of benzophenone, 4-methylbenzophenone, or 4-tert-butylbenzophenone, and more preferably benzophenone.

[0013] Preferably, the raw material for preparing the glass fiber cloth includes glass fiber, and the glass fiber includes twisted single yarn of alkali-free E-glass fiber.

[0014] Preferably, the diameter of the glass fiber monofilament is 5-8 μm, for example, it can be 5.5 μm, 6 μm, 6.5 μm, 7 μm or 7.5 μm.

[0015] Preferably, the basis weight of the glass fiber cloth is 110-160 g / m². 2 For example, it can be 120g / m 2130g / m 2 135g / m 2 140g / m 2 Or 150g / m 2 wait.

[0016] Preferably, the weaving linear density of the glass fiber is 13-14 bundles / cm in the warp direction (e.g., 13.2 bundles / cm, 13.4 bundles / cm, 13.5 bundles / cm, 13.6 bundles / cm or 13.8 bundles / cm, etc.) and 13-15 bundles / cm in the weft direction (e.g., 13.2 bundles / cm, 13.5 bundles / cm, 14 bundles / cm, 14.3 bundles / cm or 14.5 bundles / cm, etc.).

[0017] Preferably, the thickness of the glass fiber cloth is 0.1-0.2 mm, for example, it can be 0.12 mm, 0.14 mm, 0.15 mm, 0.16 mm or 0.18 mm.

[0018] Preferably, the fiberglass cloth is woven in a plain weave.

[0019] Preferably, the resin matrix comprises epoxy resin.

[0020] Preferably, the raw materials for preparing the resin matrix include epoxy resin and methyl methacrylate.

[0021] In this invention, by using methyl methacrylate and epoxy resin to adjust the refractive index of the resin matrix, the refractive index difference between the resin matrix and the glass fiber cloth is reduced, thereby increasing the transmittance of the glass fiber prepreg.

[0022] Preferably, the mass ratio of epoxy resin to methyl methacrylate is (0.6-1):1, for example, it can be 0.65:1, 0.7:1, 0.8:1, 0.9:1 or 0.95:1, etc.

[0023] In this invention, when the mass ratio of epoxy resin to methyl methacrylate is (0.6-1):1, the refractive index of the cured resin matrix is ​​optimal, and the transmittance of the glass fiber prepreg is highest.

[0024] Preferably, the refractive index n of the epoxy resin is... d 25 It is 1.54-1.56, for example, it can be 1.542, 1.545, 1.549, 1.553, 1.555 or 1.558, etc.

[0025] Preferably, the refractive index n of the methyl methacrylate is... d 25It is between 1.46 and 1.48, for example, it can be 1.465, 1.468, 1.469, 1.472, 1.475 or 1.478, etc.

[0026] Preferably, the refractive index n of the glass fiber cloth is... d 25 It is between 1.55 and 1.57, for example, it can be 1.552, 1.555, 1.558, 1.563, 1.565 or 1.568, etc.

[0027] Preferably, the refractive index n of the resin matrix is... d 25 It is between 1.55 and 1.57, for example, it can be 1.555, 1.558, 1.559, 1.563, 1.565 or 1.568, etc.

[0028] In this invention, the refractive index n d 25 The test method is as follows: the test is conducted in accordance with the test method for refractive index and dispersion coefficient in colorless optical glass in GB-T 7962.1-2010 standard.

[0029] In a second aspect, the present invention provides a method for preparing a glass fiber prepreg as described in the first aspect, the method comprising the following steps:

[0030] The modified glass fiber cloth is impregnated with a resin matrix solution and then pressed to obtain the glass fiber prepreg.

[0031] Preferably, the impregnation process further includes a pretreatment step, wherein the pretreatment method includes degumming, sizing, and drying of the modified glass fiber cloth.

[0032] Preferably, the pressure forming process further includes a post-processing step, wherein the post-processing method includes drying, film application, and winding.

[0033] Preferably, the method for preparing the modified glass fiber cloth includes the following steps:

[0034] Benzene was added to the monomer solution, and the amino-modified glass fiber cloth was immersed in the monomer solution. The grafting reaction was carried out by ultraviolet irradiation to obtain the modified glass fiber cloth.

[0035] Preferably, the process further includes a pretreatment step before immersing the amino-modified glass fiber cloth into the monomer solution. The pretreatment method includes surface cleaning and high-temperature heat treatment of the amino-modified glass fiber cloth. The high temperature is 300-400℃, for example, 310℃, 320℃, 330℃, 340℃, 350℃, 360℃, 370℃, 380℃, or 390℃.

[0036] Preferably, the method for preparing the resin matrix solution includes the following steps:

[0037] Epoxy resin and methyl methacrylate are dissolved in an organic solvent and mixed to carry out a polymerization reaction to obtain the resin matrix solution.

[0038] Preferably, the polymerization reaction time is 2-3 hours, for example, 2.1 hours, 2.3 hours, 2.5 hours, 2.6 hours or 2.8 hours.

[0039] Preferably, the reaction temperature of the polymerization reaction is 100-130℃, for example, it can be 105℃, 110℃, 115℃, 120℃ or 125℃.

[0040] Thirdly, the present invention provides an application of the glass fiber prepreg as described in the first aspect in photovoltaic modules.

[0041] Compared with the prior art, the present invention has at least the following beneficial effects:

[0042] (1) The present invention improves the compatibility between glass fiber cloth and resin matrix by grafting acrylic acid and / or maleic anhydride onto the surface of glass fiber, thereby generating chemical bonds, hydrogen bonds and other interactions between glass fiber and resin matrix, and thus improving the mechanical properties and durability of glass fiber prepreg.

[0043] (2) By optimizing the ratio of methyl methacrylate (MMA) to epoxy resin, the present invention improves the refractive index difference between the resin matrix and the glass fiber cloth, reduces light refraction at the interface between the resin matrix and the glass fiber cloth, thereby increasing light transmission, increasing the transmittance of the glass fiber prepreg, and thus improving the power generation of the photovoltaic module. Attached Figure Description

[0044] Figure 1 This is a diagram of the encapsulation structure of the photovoltaic module of the present invention, wherein 201 is a transparent fluorine film material (ETFE / PVDF / PVF), 202 is an encapsulating film EVA, 203 is the glass fiber prepreg of the present invention, 204 is the encapsulating film POE, 205 is a solar cell, 206 is the encapsulating film POE, 207 is the glass fiber prepreg of the present invention, 208 is the encapsulating film EVA, and 209 is a transparent fluorine film material (ETFE / PVDF / PVF). Detailed Implementation

[0045] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments. However, the following examples 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.

[0046] Some of the raw materials used in this invention are as follows:

[0047] Fiberglass cloth (fiber weight 110g / m²) 2 Purchased from Hubei Zhuoran New Materials Co., Ltd., product name EWT100;

[0048] Fiberglass cloth (fiber weight 160g / m²) 2 Purchased from Hubei Zhuoran New Materials Co., Ltd., product name EWT160;

[0049] Fiberglass cloth (fiber weight 210g / m²) 2 Purchased from Hubei Zhuoran New Materials Co., Ltd., product name EWT210;

[0050] The terpolymer random copolymer of styrene-acrylonitrile-glycidyl methacrylate was purchased from Fine-Blend Ltd., brand name Fine- SAG-002.

[0051] Example 1

[0052] This embodiment provides a glass fiber prepreg and its preparation method. The glass fiber prepreg comprises modified glass fiber cloth and a resin matrix. Taking the glass fiber prepreg as 100% by mass, the modified glass fiber cloth comprises 55% by mass, and the resin matrix comprises 45% by mass. The raw materials for preparing the modified glass fiber cloth include 100 parts of amino-modified glass fiber cloth (fiber weight 110 g / m²). 2 The resin comprises 5 parts benzophenone and 20 parts acrylic acid. The resin matrix is ​​epoxy resin.

[0053] The method for preparing the glass fiber prepreg includes the following steps:

[0054] (1) Preparation of modified glass fiber cloth: The glass fiber cloth was ultrasonically cleaned with acetone; the amino-modified glass fiber cloth was heat-treated at 300°C; acrylic acid was dissolved in 80 parts of butyl acetate organic solvent, benzophenone was added, the amino-modified glass fiber cloth was immersed in the monomer solution, and ultraviolet irradiation was used to initiate the grafting reaction. Acrylic acid monomer was grafted onto the surface of the amino-modified glass fiber cloth in combination with benzophenone. The grafting reaction time was 1 hour and the temperature was 25°C to obtain the modified glass fiber cloth.

[0055] (2) Preparation of glass fiber prepreg: Modified glass fiber cloth is drawn into a traction roller, and the modified glass fiber cloth is degummed, sized, and dried at high temperature; the glass fiber cloth is impregnated with a resin matrix solution in an impregnation tank, pressurized, dried, covered with a release film, and wound up to obtain the glass fiber prepreg. The solvent of the resin matrix solution is n-butanol, and the concentration of the epoxy resin in the n-butanol is 30%wt.

[0056] Example 2

[0057] This embodiment provides a glass fiber prepreg and its preparation method. The glass fiber prepreg comprises modified glass fiber cloth and a resin matrix. Taking the glass fiber prepreg as 100% by mass, the modified glass fiber cloth comprises 55% by mass, and the resin matrix comprises 45% by mass. The raw materials for preparing the modified glass fiber cloth include 100 parts of glass fiber cloth (fiber weight 110 g / m²). 2 The resin matrix is ​​prepared from 5 parts benzophenone and 20 parts acrylic acid. The raw materials for preparing the resin matrix include epoxy resin and methyl methacrylate, wherein the mass ratio of epoxy resin to methyl methacrylate is 2:1.

[0058] The method for preparing the glass fiber prepreg includes the following steps:

[0059] (1) Preparation of modified glass fiber cloth: The glass fiber cloth was ultrasonically cleaned with acetone; the amino-modified glass fiber cloth was heat-treated at 300°C; acrylic acid was dissolved in 80 parts of butyl acetate organic solvent, benzophenone was added, the amino-modified glass fiber cloth was immersed in the monomer solution, and ultraviolet irradiation was used to initiate the grafting reaction. Acrylic acid monomer was grafted onto the surface of the amino-modified glass fiber cloth in combination with benzophenone. The grafting reaction time was 1 hour and the temperature was 25°C to obtain the modified glass fiber cloth.

[0060] (2) Preparation of resin matrix solution: Epoxy resin and methyl methacrylate are dissolved in n-butanol, wherein the concentration of epoxy resin and methyl methacrylate in n-butanol is 30%wt, and the mixture is subjected to polymerization reaction. The polymerization reaction time is 2.5h and the temperature is 100℃ to obtain the resin matrix solution.

[0061] (3) Preparation of glass fiber prepreg: The modified glass fiber cloth is drawn into the traction roller, and the modified glass fiber cloth is degummed, sized and dried at high temperature; the glass fiber cloth is impregnated with resin matrix solution in the impregnation tank, pressurized and formed, dried, release film is attached and wound up to obtain the glass fiber prepreg.

[0062] Example 3

[0063] This embodiment provides a glass fiber prepreg and its preparation method. The only difference from Example 2 is that the mass ratio of epoxy resin to methyl methacrylate is 1.25:1.

[0064] Example 4

[0065] This embodiment provides a glass fiber prepreg and its preparation method. The only difference from Example 2 is that the mass ratio of epoxy resin to methyl methacrylate is 0.8:1.

[0066] Example 5

[0067] This embodiment provides a glass fiber prepreg and its preparation method. The only difference from Example 2 is that the mass ratio of epoxy resin to methyl methacrylate is 0.5:1.

[0068] Example 6

[0069] This embodiment provides a glass fiber prepreg and its preparation method. The only difference from Embodiment 2 is that, based on a 100% mass percentage of the glass fiber prepreg, the modified glass fiber cloth has a mass percentage of 60%, and the resin matrix has a mass percentage of 40%; the raw materials for preparing the modified glass fiber cloth include 100 parts of glass fiber cloth (fiber weight 160 g / m²). 2 The resin matrix is ​​prepared from epoxy resin and methyl methacrylate, with a mass ratio of epoxy resin to methyl methacrylate of 3:1. (The original text contains 6 parts of benzophenone and 30 parts of maleic anhydride.)

[0070] Example 7

[0071] This embodiment provides a glass fiber prepreg and its preparation method. The only difference from Example 6 is that the mass ratio of epoxy resin to methyl methacrylate is 1.67:1.

[0072] Example 8

[0073] This embodiment provides a glass fiber prepreg and its preparation method. The only difference from Example 6 is that the mass ratio of epoxy resin to methyl methacrylate is 1:1.

[0074] Example 9

[0075] This embodiment provides a glass fiber prepreg and its preparation method. The only difference from Embodiment 1 is that the glass fiber prepreg includes a modified fiber cloth and a resin matrix. Taking the glass fiber prepreg as 100% by mass, the modified glass fiber cloth comprises 60% by mass, and the resin matrix comprises 40% by mass. The raw materials for preparing the modified glass fiber cloth include 100 parts of amino-modified glass fiber cloth (fiber weight 160 g / m²). 2 The resin comprises 6 parts benzophenone and 30 parts maleic anhydride. The resin matrix is ​​epoxy resin.

[0076] Example 10

[0077] This embodiment provides a glass fiber prepreg and its preparation method. The only difference from Embodiment 2 is that, based on a 100% mass percentage of the glass fiber prepreg, the modified glass fiber cloth has a mass percentage of 65%, and the resin matrix has a mass percentage of 35%; the raw materials for preparing the modified glass fiber cloth include 100 parts of amino-modified glass fiber cloth (fiber weight 220 g / m²). 2 The resin matrix comprises 3 parts benzophenone, 7.5 parts maleic anhydride, and 7.5 parts acrylic acid. The raw materials for preparing the resin matrix include epoxy resin and methyl methacrylate, wherein the mass ratio of epoxy resin to methyl methacrylate is 2.5:1.

[0078] Example 11

[0079] This embodiment provides a glass fiber prepreg and its preparation method. The only difference from Example 10 is that the mass ratio of epoxy resin to methyl methacrylate is 1.33:1.

[0080] Example 12

[0081] This embodiment provides a glass fiber prepreg and its preparation method. The only difference from Example 10 is that the mass ratio of epoxy resin to methyl methacrylate is 0.75:1.

[0082] Example 13

[0083] This embodiment provides a glass fiber prepreg and its preparation method. The only difference from Embodiment 1 is that the glass fiber prepreg includes a modified fiber cloth and a resin matrix. Taking the glass fiber prepreg as 100% by mass, the modified glass fiber cloth comprises 65% by mass, and the resin matrix comprises 35% by mass. The raw materials for preparing the modified glass fiber cloth include 100 parts of amino-modified glass fiber cloth (fiber weight 220 g / m²). 2 The resin composition is 3 parts benzophenone, 7.5 parts maleic anhydride, and 7.5 parts acrylic acid. The resin matrix is ​​epoxy resin.

[0084] Comparative Example 1

[0085] This comparative example provides a glass fiber prepreg and its preparation method. The only difference from Example 4 is that, instead of modifying the amino-modified glass fiber cloth, a compatibilizer is added.

[0086] Specifically, the glass fiber prepreg comprises amino-modified glass fiber cloth, a resin matrix, and a compatibilizer. Based on a 100% mass percentage of the glass fiber prepreg, the amino-modified glass fiber cloth comprises 53.9% by mass, the resin matrix comprises 44.1% by mass, and the compatibilizer comprises 2% by mass. The compatibilizer is a terpolymer of styrene-acrylonitrile-glycidyl methacrylate, brand name Fine- SAG-002. The raw materials for preparing the resin matrix include epoxy resin and methyl methacrylate, wherein the mass ratio of epoxy resin to methyl methacrylate is 0.8:1.

[0087] The method for preparing the glass fiber prepreg includes the following steps:

[0088] (1) Preparation of resin matrix solution: Epoxy resin and methyl methacrylate are dissolved in n-butanol, wherein the concentration of epoxy resin and methyl methacrylate in n-butanol is 30%wt, and the mixture is subjected to polymerization reaction. The polymerization reaction time is 2.5h and the temperature is 100℃ to obtain the resin matrix solution.

[0089] (2) Preparation of glass fiber prepreg: Add compatibilizer to resin matrix solution to obtain mixed solution; draw modified glass fiber cloth into traction roller, degumme, sizing and dry modified glass fiber cloth at high temperature; impregnate glass fiber cloth with mixed solution in impregnation tank, press and form, dry, apply release film and wind up to obtain glass fiber prepreg.

[0090] Application Example 1-13, Comparison with Application Example 1

[0091] Application Examples 1-13 and Comparative Application Example 1 each provide a photovoltaic module, the encapsulation structure of which is as follows: Figure 1 As shown, specifically:

[0092] (1) The front plate 201 of the encapsulation is a transparent PVDF film with a thickness of 35μm;

[0093] (2) The first encapsulating film 202 is made of EVA material with a thickness of 0.55mm;

[0094] (3) The first impact-resistant reinforcing layer 203 is made of glass fiber prepreg (from Examples 1-13 or Comparative Example 1) and has a thickness of 0.32 mm;

[0095] (4) The second encapsulating film 204 is made of POE film material with a thickness of 0.55mm;

[0096] (5) The battery string layer 205 uses XBC batteries, and the battery string adopts 1 / 2 slices. 12 1 / 2 slices of battery cells are connected in series to form a string, and a 3-string series arrangement design is adopted. The power range is between 100W and 110W.

[0097] (6) The third encapsulating film 206 is made of POE film material with a thickness of 0.45mm;

[0098] (7) The material used for the second impact-resistant reinforcement layer 207 is the same as that used for the first impact-resistant reinforcement layer 203, maintaining a symmetrical structure;

[0099] (8) The fourth encapsulating film 208 is made of EVA film material with a thickness of 0.55mm;

[0100] (9) The encapsulation backplate 209 is a transparent PVDF film with a thickness of 35μm;

[0101] The photovoltaic module is prepared by following conventional methods in the field, including slicing, stringing, stacking, laying, laminating, and cutting of the solar cells.

[0102] Test methods

[0103] Visible light transmittance T%: The test was conducted in accordance with the GB / T 29848-2013 test standard. Three parallel samples were tested in each group, and the effective values ​​were recorded and averaged.

[0104] Impact resistance: Using a 500g steel ball with a diameter of 49.7mm, the impact energy of a drop from a height of 0.5m is 2.5J. The steel ball was used to replace the ice hockey ball to conduct vertical impacts on 11 representative points on the component one by one. After the test, the product showed no obvious damage, whitening, or delamination, and the electrical performance was normal, with the maximum power attenuation not exceeding 10%.

[0105] Nominal power: The standard test condition for photovoltaic module performance refers to 1000W / m. 2 The irradiance, device temperature 25°C, and the spectrum of AM1.5G as defined by the IEC 60904-3 standard.

[0106] Bifaciality: also known as bifacial nameplate irradiance (BNPI): refers to the reference irradiance conditions given in IEC 61215 when calibrating bifacial modules on their nameplates, i.e., 1000 W / m² received on the front side of the module. 2 Irradiance, and simultaneously receives 135W / m on the back. 2 Irradiance, except for other test conditions, is the same as STC.

[0107] DH500 test: Set the temperature control chamber to a high temperature of 85℃ and a humidity of 85%RH. The temperature rises from 25℃ to 85℃ at a rate not exceeding 100℃ / H. Then start the test program. The test duration is DH500 / 21D+16H. Test IV and EL and record the relevant data. Compare with the initial power. The maximum power attenuation should not exceed 10%.

[0108] For TC100 testing, the temperature control chamber was set to a high temperature of 85℃, a humidity of 50% RH, and a low temperature of -40℃, maintained for 30 minutes each. The high and low temperature switching rate did not exceed 100℃ / hour, and each cycle did not exceed 6 hours. The test duration was TC100 / 21D+16 hours. After that, IV and EL were tested and recorded. The results were compared with the initial power, and the maximum power attenuation did not exceed 10%.

[0109] Test Results

[0110] Table 1

[0111]

[0112]

[0113] The test results show that:

[0114] (1) As can be seen from Examples 1-13, the present invention improves the surface chemical properties and physical structure of glass fiber cloth by surface treatment, improves the wettability of glass fiber cloth and resin matrix, significantly enhances the interfacial bonding strength between glass fiber cloth and resin matrix, and ultimately improves the mechanical properties and durability of composite material.

[0115] (2) By comparing Examples 2-8 and 10-12 with Examples 1, 9 and 13, it can be seen that the present invention improves the transmittance of glass fiber prepreg by further using methyl methacrylate and epoxy resin to adjust the refractive index of the resin matrix.

[0116] (3) As can be seen from the comparison of Examples 2-5, the present invention improves the transmittance of glass fiber prepreg by further limiting the mass ratio of epoxy resin to methyl methacrylate.

[0117] (4) As can be seen from Example 4 and Comparative Example 1, if the glass fiber is not surface treated, the mechanical properties and durability of the glass fiber prepreg will decrease.

[0118] In summary, this invention improves the surface chemical properties and physical structure of glass fiber cloth by surface treatment, enhances the wettability of glass fiber cloth with resin matrix, significantly improves the interfacial bonding strength between glass fiber cloth and resin matrix, and ultimately improves the mechanical properties and durability of composite materials.

[0119] 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 glass fiber prepreg, characterized in that, The glass fiber prepreg comprises modified glass fiber cloth and a resin matrix; With the glass fiber prepreg having a mass percentage of 100%, the modified glass fiber cloth has a mass percentage of 55%-65%, and the resin matrix has a mass percentage of 35%-45%. The raw materials for preparing the modified glass fiber cloth include amino-modified glass fiber cloth, benzophenone, and polymer monomers. The polymer monomers include acrylic acid and / or maleic anhydride.

2. The glass fiber prepreg according to claim 1, characterized in that, The raw materials for preparing the modified glass fiber cloth include the following components in parts by weight: 100 parts of amino-modified glass fiber cloth, 3-6 parts of photosensitizer, and 15-30 parts of polymer monomer. Preferably, the photosensitizer includes any one or a combination of at least two of benzophenone, 4-methylbenzophenone, or 4-tert-butylbenzophenone, and more preferably benzophenone.

3. The glass fiber prepreg according to claim 1 or 2, characterized in that, The raw materials for preparing the glass fiber cloth include glass fibers, and the glass fibers include twisted single yarns of alkali-free E-glass fibers. Preferably, the diameter of the glass fiber monofilament is 5-8 μm.

4. The glass fiber prepreg according to any one of claims 1-3, characterized in that, The weight of the fiberglass cloth is 110-160 g / m². 2 ; Preferably, the weaving linear density of the glass fiber is 13-14 bundles / cm in the warp direction and 13-15 bundles / cm in the weft direction; Preferably, the thickness of the glass fiber cloth is 0.1-0.2 mm; Preferably, the fiberglass cloth is woven in a plain weave.

5. The glass fiber prepreg according to any one of claims 1-4, characterized in that, The raw materials for preparing the resin matrix include epoxy resin and methyl methacrylate; Preferably, the mass ratio of epoxy resin to methyl methacrylate is (0.6-1):

1.

6. A method for preparing a glass fiber prepreg as described in any one of claims 1-5, characterized in that, The preparation method comprises the following steps: The modified glass fiber cloth is impregnated with a resin matrix solution and then pressed to obtain the glass fiber prepreg.

7. The method for preparing glass fiber prepreg according to claim 6, characterized in that, The impregnation process also includes a pretreatment step, the pretreatment method of which includes degumming, sizing, and drying the modified glass fiber cloth; Preferably, the pressure forming process further includes a post-processing step, wherein the post-processing method includes drying, film application, and winding.

8. The method for preparing glass fiber prepreg according to claim 6 or 7, characterized in that, The method for preparing the modified glass fiber cloth includes the following steps: Benzene was added to the monomer solution, and the amino-modified glass fiber cloth was immersed in the monomer solution. The grafting reaction was carried out by ultraviolet irradiation to obtain the modified glass fiber cloth. Preferably, the process further includes a pretreatment step before immersing the amino-modified glass fiber cloth into the monomer solution. The pretreatment method includes surface cleaning and high-temperature heat treatment of the amino-modified glass fiber cloth, wherein the high temperature is 300-400°C.

9. The method for preparing glass fiber prepreg according to any one of claims 6-8, characterized in that, The method for preparing the resin matrix solution includes the following steps: Epoxy resin and methyl methacrylate are dissolved in an organic solvent, mixed and polymerized to obtain the resin matrix solution. Preferably, the polymerization reaction takes 2-3 hours. Preferably, the polymerization reaction temperature is 100-130℃.

10. The application of a glass fiber prepreg as described in any one of claims 1-5 in a photovoltaic module.

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