A special structural adhesive for photovoltaic aluminum alloy fixture and its preparation method

Abstract

The present invention discloses a special structural adhesive for photovoltaic aluminum alloy fixtures and a preparation method thereof. The special structural adhesive for photovoltaic aluminum alloy fixtures is composed of component A and component B. Component A includes the following raw materials by mass percentage: 20-40% room temperature vulcanized methyl silicone rubber; 5-15% polysilicone polymer; 15-25% aluminum hydroxide; 5-15% silicon dioxide; the balance is silicon carbide; and component B includes the following raw materials by mass percentage: 15-25% black pigment; 5-15% 3-aminopropyltrimethoxysilane; 2-4% dibutyltin dilaurate; 15-25% silicon dioxide; 15-25% methyltributylanoxime silane; the balance is vinyltributylanoxime silane. The special structural adhesive for photovoltaic aluminum alloy fixtures of the present invention has excellent bonding performance, weather resistance, aging resistance, temperature resistance and environmental protection, and the preparation process is simple, which is conducive to the installation and fixation of aluminum alloy fixtures widely used in photovoltaic modules.

Description

Technical Field

[0001] The present invention relates to the photovoltaic industry, and in particular to a special structural adhesive for photovoltaic aluminum alloy fixtures and a preparation method thereof. Background Art

[0002] With the rapid development of the photovoltaic industry, the technology used in the installation and fixing of photovoltaic modules has become increasingly important. In order to ensure that photovoltaic modules can maintain stability and have a long service life in various harsh environments, it is particularly important to select high-performance structural adhesives.

[0003] Given that photovoltaic modules need to maintain stable operation in various harsh environments, the bonding strength of structural adhesives is crucial to ensure the stability of photovoltaic modules under these harsh conditions. Therefore, when developing structural adhesives specifically for photovoltaic aluminum alloy fixtures, bonding strength is a performance indicator that requires special attention.

[0004] At the same time, photovoltaic modules are exposed to the natural environment for a long time and are subject to erosion by natural factors such as ultraviolet rays, temperature fluctuations, wind and rain. This places extremely high demands on the weather resistance and anti-aging properties of structural adhesives to ensure that photovoltaic modules can maintain good performance during long-term use.

[0005] In addition, photovoltaic modules may face challenges in high-temperature environments during operation, so structural adhesives need to have excellent high-temperature resistance to ensure that they can still perform their bonding and fixing functions under high-temperature conditions.

[0006] While various structural adhesives are available on the market, they often struggle to meet the harsh operating conditions of photovoltaic modules. Therefore, developing a superior structural adhesive specifically designed for photovoltaic aluminum alloy fixtures is of great practical significance. This structural adhesive must meet requirements for bond strength, weather resistance, aging resistance, and high-temperature resistance while also offering advantages in production costs and environmental performance, enabling widespread application in the photovoltaic industry. Summary of the Invention

[0007] In view of the deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a special structural adhesive for photovoltaic aluminum alloy clamps and a preparation method thereof.

[0008] The present invention provides a special structural adhesive for photovoltaic aluminum alloy fixtures, which consists of component A and component B.

[0009] The A component includes the following raw materials in percentage by weight:

[0010] Room temperature vulcanized methyl silicone rubber 20-40%;

[0011] Polysilicon polymer 5-15%;

[0012] Aluminum hydroxide 15-25%;

[0013] Silicon dioxide 5-15%;

[0014] The balance is silicon carbide;

[0015] The B component includes the following raw materials in percentage by weight:

[0016] Black pigment 15-25%

[0017] 3-Aminopropyltrimethoxysilane 5-15%;

[0018] Dibutyltin dilaurate 2-4%;

[0019] Silicon dioxide 15-25%;

[0020] Methyl tributyl ketoxime silane 15-25%;

[0021] The balance is vinyltributylanoxime silane;

[0022] The mass ratio of component A to component B is (5-15):1.

[0023] The present invention also provides a method for preparing a special structural adhesive for photovoltaic aluminum alloy fixtures, comprising the following steps:

[0024] Step 1: Mix room temperature vulcanized methyl silicone rubber, polysilicon polymer, aluminum hydroxide, silicon dioxide, and silicon carbide to prepare component A;

[0025] Step 2: Mix black pigment, 3-aminopropyltrimethoxysilane, dibutyltin dilaurate, silicon dioxide, methyltributylanoxime silane, and vinyltributylanoxime silane to prepare component B;

[0026] Step 3: Mix component A and component B to obtain the special structural adhesive for photovoltaic aluminum alloy fixtures.

[0027] Preferably, a method for preparing a special structural adhesive for photovoltaic aluminum alloy fixtures comprises the following steps:

[0028] Step 1: Mix room temperature vulcanized methyl silicone rubber, polysilicon polymer, aluminum hydroxide, silicon dioxide, and silicon carbide, stir, grind, remove bubbles, and filter to obtain component A;

[0029] Step 2: Mix black pigment, 3-aminopropyltrimethoxysilane, dibutyltin dilaurate, silicon dioxide, methyltributylanoximesilane, and vinyltributylanoximesilane, stir, and filter under vacuum conditions to obtain component B;

[0030] Step 3: Mix component A and component B to obtain the special structural adhesive for photovoltaic aluminum alloy fixtures.

[0031] In the present invention, the role of each raw material is briefly introduced as follows:

[0032] Component A:

[0033] 1.1 Vulcanized methyl silicone rubber: As a silicone rubber base material, it has excellent weather resistance, UV resistance and thermal stability, and can improve the bonding performance and anti-aging performance of structural adhesives.

[0034] 1.2 Silicone polymers: Serving as silicone rubber curing agents, they improve the temperature resistance of the silicone rubber cross-linked network. Silicone polymers are a broad class of polymers with silicon atoms as a main chain component. These polymers can be at least one of polydimethylsiloxane (PDMS), polysilazanes, polysilicates, polysilanes, polysilazanes, polysilathianes, polysilimides, and polysiloxanes.

[0035] Preferably, the polysiloxane may be tetramethyltetraphenyl trisiloxane, polydimethylsiloxane, polysilicone-15, cyclodimethylpolysiloxane, poly(methyl 3,3,3-trifluoropropyl)siloxane, polymethylphenylpolysiloxane, polydimethylsiloxane, or polymethylvinylsiloxane.

[0036] The polysilazane may be a branched structure polysilazane, an ethylenediamine-modified polysilazane, or a meta-xylylenediamine-modified polysilazane.

[0037] Preferably, the polysilicone polymer is poly(methyl 3,3,3-trifluoropropyl)siloxane and / or meta-xylylenediamine-modified polysilazane.

[0038] Poly(trifluoropropyl(methyl)siloxane] (CAS No. 63148-56-1) has the following characteristics:

[0039] Strong hydrophobicity: Since poly (methyl 3,3,3-trifluoropropyl) siloxane contains trifluoropropyl groups in its structure, this group has strong hydrophobicity, so it can significantly improve the water resistance of the polymer and reduce the impact of water molecules on the material.

[0040] Good chemical resistance: The carbon-fluorine bond in the trifluoropropyl group has a high bond energy, so poly(methyl 3,3,3-trifluoropropyl)siloxane has good chemical resistance. This means that this material can maintain good stability in some chemically corrosive environments.

[0041] Good thermal stability: Due to the high bond energy of the carbon-fluorine bond, poly(methyl 3,3,3-trifluoropropyl)siloxane has good thermal stability. This allows it to maintain good performance in high temperature environments.

[0042] Low surface tension: Poly(methyl 3,3,3-trifluoropropyl) siloxane has low surface tension, which helps improve the material's wettability and adhesion, resulting in better performance in applications.

[0043] Low friction coefficient: The presence of trifluoropropyl groups makes poly (methyl 3,3,3-trifluoropropyl) siloxane have a lower friction coefficient, thereby improving the wear resistance of the material.

[0044] In summary, poly(methyl 3,3,3-trifluoropropyl) siloxane shows good effects in the special structural adhesive for photovoltaic aluminum alloy fixtures of the present invention, which may be due to the many advantages brought by its unique trifluoropropyl group, such as hydrophobicity, chemical corrosion resistance, thermal stability, low surface tension and low friction coefficient.

[0045] Meta-phenylenediamine modified polysilazane has the following characteristics:

[0046] Molecular structure: During the preparation process, meta-xylylenediamine-modified polysilazane is introduced as an acid-binding agent, resulting in a unique molecular structure. This modified structure imparts improved thermal stability, chemical resistance, and mechanical properties to the polysilazane.

[0047] Aromatic ring groups: The introduction of m-xylylenediamine adds a special aromatic ring group to the polysilazane molecular chain. The aromatic ring structure has high thermal stability and rigidity, which can improve the thermal stability of the polysilazane itself and the cross-linked silicone rubber network.

[0048] Improved adhesion: The introduction of m-phenylenediamine gives polysilazane better polarity, which helps improve its adhesion to the aluminum alloy surface, thereby improving the performance of the entire structural adhesive.

[0049] Enhanced crosslink density: During the curing process, m-xylenediamine-modified polysilazane undergoes a dehydration crosslinking reaction with the silanol groups in silicone rubber, forming a stable three-dimensional network structure. The introduction of aromatic ring groups enhances the crosslink density, giving the silicone rubber higher mechanical properties.

[0050] Improved weather resistance: Due to the introduction of m-phenylenediamine groups, modified polysilazane has better UV absorption ability, which can improve the weather resistance of silicone rubber and make it perform better in outdoor applications.

[0051] In summary, m-phenylenediamine-modified polysilazane shows good effects in the special structural adhesive for photovoltaic aluminum alloy fixtures, which may be due to its special molecular structure, the introduction of aromatic ring groups and the corresponding performance improvement.

[0052] The inventors have discovered through experiments that poly(methyl 3,3,3-trifluoropropyl)siloxane and meta-xylenediamine-modified polysilazane exhibit a certain degree of synergistic effect. Optimally, the polysilicone polymer is composed of poly(methyl 3,3,3-trifluoropropyl)siloxane and meta-xylenediamine-modified polysilazane in a mass ratio of (1-2):(1-2).

[0053] Poly(methyl 3,3,3-trifluoropropyl)siloxane and m-phenylenediamine-modified polysilazane exhibit synergistic effects to a certain extent. The inventors speculate that this may be related to the following factors:

[0054] Molecular structure complementarity: Poly(methyl 3,3,3-trifluoropropyl) siloxane has strong hydrophobicity and low surface energy, and can produce a molecular structure complementary effect with meta-phenylenediamine-modified polysilazane, thereby improving the overall performance of the colloid.

[0055] Crosslink Density: During the mixing process, the two polymers undergo crosslinking reactions with the silicone rubber. Poly(3,3,3-trifluoropropylmethyl)siloxane undergoes an addition reaction with the silicon-hydrogen bonds in the silicone rubber, while the m-xylylenediamine-modified polysilazane undergoes a dehydration crosslinking reaction with the silanol groups in the silicone rubber. These two interactions increase the crosslink density of the silicone rubber, thereby enhancing its overall mechanical properties.

[0056] Compatibility: Poly(methyl 3,3,3-trifluoropropyl)siloxane and m-xylenediamine-modified polysilazane exhibit good compatibility within the silicone rubber matrix. This compatibility helps reduce the mutual repulsion between the two polymers, allowing them to be evenly distributed within the silicone rubber matrix, improving overall performance.

[0057] Heat resistance: Poly(methyl 3,3,3-trifluoropropyl)siloxane and m-xylylenediamine-modified polysilazane both have good heat resistance. They can maintain good stability at high temperatures, thereby improving the performance of silicone rubber in high temperature environments.

[0058] Synergistic effect: The composite application of poly (methyl 3,3,3-trifluoropropyl) siloxane and meta-xylylenediamine modified polysilazane produces a synergistic effect in cross-linking, mechanical properties, heat resistance, weather resistance, etc., thereby improving the overall performance of silicone rubber.

[0059] Hydrophobicity: The introduction of trifluoropropyl groups enhances the hydrophobicity of poly(methyl 3,3,3-trifluoropropyl)siloxane. This hydrophobicity helps improve the silicone rubber's resistance to hydrolysis and moisture. Furthermore, the m-xylylenediamine-modified polysilazane itself exhibits excellent heat and weather resistance. When these two polymers work together, they complement each other's strengths, enhancing the stability and durability of the silicone rubber in harsh environmental conditions.

[0060] In summary, the synergistic effect of poly(methyl 3,3,3-trifluoropropyl)siloxane and m-xylenediamine-modified polysilazane in silicone rubber may be related to multiple factors, including molecular structural complementarity, crosslink density, compatibility, heat resistance, synergistic effects, and hydrophobicity. The combined effect of these two polymers significantly improves the mechanical properties, heat resistance, weathering resistance, and hydrolysis resistance of silicone rubber. Therefore, using these two polymers in structural adhesives specifically designed for photovoltaic aluminum alloy fixtures can provide an effective solution for improving the overall performance of the colloid.

[0061] 1.3 Aluminum hydroxide: As a high-temperature resistant filler, it can improve the high-temperature resistance, thermal conductivity and mechanical strength of structural adhesives.

[0062] 1.4 Silica: As a reinforcing filler, it can improve the mechanical strength, wear resistance, corrosion resistance and aging resistance of structural adhesives.

[0063] 1.5 Silicon carbide: As a filler, it helps to improve the viscosity, hardness, compression resistance and wear resistance of structural adhesives.

[0064] Component B:

[0065] 2.1 Black pigment: provides uniform coloring effect for structural adhesive and increases its aesthetics.

[0066] 2.23-Aminopropyltrimethoxysilane: As a silane coupling agent, it helps improve the adhesion between the filler and the silicone rubber substrate and enhance the bonding performance of the structural adhesive.

[0067] 2.3 Dibutyltin dilaurate: As a catalyst, it can accelerate the vulcanization reaction of silicone rubber substrate and improve the hardness and weather resistance of structural adhesive.

[0068] 2.4 Silica: Same as the silica in component A, it acts as a reinforcing filler to improve the mechanical strength, wear resistance, corrosion resistance and aging resistance of the structural adhesive.

[0069] 2.5 Methyl tributyl ketoxime silane: As a crosslinking agent, it can improve the heat resistance, weather resistance, aging resistance and bonding properties of structural adhesives.

[0070] 2.6 Vinyl trisbutyl ketoxime silane: Also used as a crosslinker, it helps improve the elasticity, heat resistance, weather resistance, anti-aging properties, and bonding properties of structural adhesives. When used in combination with methyl trisbutyl ketoxime silane, it can achieve better crosslinking effect and performance balance.

[0071] In summary, these raw materials together impart the excellent properties required of the structural adhesive for photovoltaic aluminum alloy fixtures, such as high-temperature resistance, weather resistance, aging resistance, and bond strength. Their synergistic effect enables this structural adhesive to adapt to the harsh operating conditions of photovoltaic modules, thereby improving the installation stability and service life of photovoltaic modules.

[0072] The advantages of the present invention are as follows:

[0073] Excellent bonding performance: The special structural adhesive for photovoltaic aluminum alloy fixtures of the present invention can effectively improve the bonding strength by selecting specific raw materials and proportions, thereby ensuring the stability of photovoltaic modules in harsh environments.

[0074] Good weather resistance and aging resistance: The structural adhesive of the present invention adopts specific raw materials, such as room temperature vulcanized methyl silicone rubber and polysilicone polymers, which provides good weather resistance and aging resistance, allowing the product to withstand the erosion of the natural environment for a long time.

[0075] High temperature resistance: Raw materials such as aluminum hydroxide in the structural adhesive of the present invention help to improve the high temperature resistance of the product, enabling it to work stably under different climatic conditions.

[0076] Good environmental protection: The structural adhesive of the present invention adopts environmentally friendly raw materials and contains no harmful substances, which is beneficial to protecting the environment and human health.

[0077] The preparation process is simple: the preparation method provided by the present invention is simple and easy to implement, can realize batch production, and reduce production costs.

[0078] In summary, the present invention provides a special structural adhesive for photovoltaic aluminum alloy clamps and a preparation method thereof, which has excellent bonding performance, weather resistance, aging resistance, temperature resistance and environmental protection, and the preparation process is simple, which is conducive to the installation and fixation of aluminum alloy clamps widely used in photovoltaic modules. DETAILED DESCRIPTION

[0079] The black pigment is carbon black N330 supplied by Tianjin Huayuan.

[0080] Meta-phenylenediamine modified polysilazane was prepared according to the method provided in 2.3.3(3) of the paper "Study on the Effect of Different Structural Polysilazane Curing Systems on the Properties of Room Temperature Vulcanized Silicone Rubber". Specifically, 48 mL of dimethyldichlorosilane and 55 mL of methyltrichlorosilane were dissolved in 0.8 L of tetrahydrofuran solvent, and mixed uniformly by medium-speed magnetic stirring for 10 min. The temperature of the reaction system was lowered to -20 °C by liquid nitrogen-ethanol system. 126 mL of meta-phenylenediamine and 175 mL of pyridine were dissolved in 0.2 L of tetrahydrofuran solvent as acid binding agents. The meta-phenylenediamine solution was slowly dripped into the reaction system using a constant pressure dropping funnel. Continuous magnetic stirring and a low temperature of -20 °C were maintained during the process. After the solution was added, magnetic stirring was maintained and the reaction was continued at 0 °C for 3 h before the reaction was terminated. After centrifugation and filtration, the precipitate was removed to obtain a light yellow liquid. The tetrahydrofuran solvent in the product was then removed by rotary evaporation and vacuum pump.

[0081] Example 1

[0082] A special structural adhesive for photovoltaic aluminum alloy clamps, consisting of component A and component B.

[0083] The A component includes the following raw materials in percentage by weight:

[0084] Room temperature vulcanized methyl silicone rubber 30%

[0085] Poly(methyl 3,3,3-trifluoropropyl)siloxane 10%

[0086] Aluminum hydroxide 20%

[0087] Silicon dioxide 10%

[0088] Silicon carbide 30%;

[0089] The B component includes the following raw materials in percentage by weight:

[0090] Black pigment 20%

[0091] 3-Aminopropyltrimethoxysilane 10%

[0092] Dibutyltin dilaurate 3%

[0093] Silicon dioxide 20%

[0094] Methyl tributyl ketoxime silane 20%

[0095] Vinyl trisbutyl ketoxime silane 27%;

[0096] The present invention also provides a method for preparing a special structural adhesive for photovoltaic aluminum alloy fixtures, comprising the following steps:

[0097] Step 1: At room temperature, room temperature vulcanized methyl silicone rubber, poly (methyl 3,3,3-trifluoropropyl) siloxane, aluminum hydroxide, silicon dioxide, and silicon carbide are mixed, stirred, ground, defoamed, and filtered to obtain component A;

[0098] Step 2: Mix black pigment, 3-aminopropyltrimethoxysilane, dibutyltin dilaurate, silicon dioxide, methyltributylanoximesilane, and vinyltributylanoximesilane, stir, and filter under vacuum conditions to obtain component B;

[0099] Step 3: Mix component A and component B in a mass ratio of 10:1 to obtain the special structural adhesive for photovoltaic aluminum alloy fixtures.

[0100] Example 2

[0101] A special structural adhesive for photovoltaic aluminum alloy clamps, consisting of component A and component B.

[0102] The A component includes the following raw materials in percentage by weight:

[0103] Room temperature vulcanized methyl silicone rubber 30%

[0104] Meta-phenylenediamine modified polysilazane 10%

[0105] Aluminum hydroxide 20%

[0106] Silicon dioxide 10%

[0107] Silicon carbide 30%;

[0108] The B component includes the following raw materials in percentage by weight:

[0109] Black pigment 20%

[0110] 3-Aminopropyltrimethoxysilane 10%

[0111] Dibutyltin dilaurate 3%

[0112] Silicon dioxide 20%

[0113] Methyl tributyl ketoxime silane 20%

[0114] Vinyl trisbutyl ketoxime silane 27%;

[0115] The present invention also provides a method for preparing a special structural adhesive for photovoltaic aluminum alloy fixtures, comprising the following steps:

[0116] Step 1: At room temperature, room temperature vulcanized methyl silicone rubber, meta-xylylenediamine-modified polysilazane, aluminum hydroxide, silicon dioxide, and silicon carbide are mixed, stirred, ground, defoamed, and filtered to obtain component A;

[0117] Step 2: Mix black pigment, 3-aminopropyltrimethoxysilane, dibutyltin dilaurate, silicon dioxide, methyltributylanoximesilane, and vinyltributylanoximesilane, stir, and filter under vacuum conditions to obtain component B;

[0118] Step 3: Mix component A and component B in a mass ratio of 10:1 to obtain the special structural adhesive for photovoltaic aluminum alloy fixtures.

[0119] Example 3

[0120] A special structural adhesive for photovoltaic aluminum alloy clamps, consisting of component A and component B.

[0121] The A component includes the following raw materials in percentage by weight:

[0122] Room temperature vulcanized methyl silicone rubber 30%

[0123] Meta-phenylenediamine modified polysilazane 5%

[0124] Poly(methyl 3,3,3-trifluoropropyl)siloxane 5%

[0125] Aluminum hydroxide 20%

[0126] Silicon dioxide 10%

[0127] Silicon carbide 30%;

[0128] The B component includes the following raw materials in percentage by weight:

[0129] Black pigment 20%

[0130] 3-Aminopropyltrimethoxysilane 10%

[0131] Dibutyltin dilaurate 3%

[0132] Silicon dioxide 20%

[0133] Methyl tributyl ketoxime silane 20%

[0134] Vinyl trisbutyl ketoxime silane 27%;

[0135] The present invention also provides a method for preparing a special structural adhesive for photovoltaic aluminum alloy fixtures, comprising the following steps:

[0136] Step 1: At room temperature, room temperature vulcanized methyl silicone rubber, meta-xylylenediamine-modified polysilazane, poly(methyl 3,3,3-trifluoropropyl)siloxane, aluminum hydroxide, silicon dioxide, and silicon carbide are mixed, stirred, ground, defoamed, and filtered to obtain component A;

[0137] Step 2: Mix black pigment, 3-aminopropyltrimethoxysilane, dibutyltin dilaurate, silicon dioxide, methyltributylanoximesilane, and vinyltributylanoximesilane, stir, and filter under vacuum conditions to obtain component B;

[0138] Step 3: Mix component A and component B in a mass ratio of 10:1 to obtain the special structural adhesive for photovoltaic aluminum alloy fixtures.

[0139] Test Example 1: Adhesion Strength

[0140] Adhesive strength: Tested in accordance with GB / T 7124-2008, "Adhesives - Determination of tensile shear strength (rigid to rigid)." Two aluminum alloy sheets, 100 (±0.25) mm × 25 (±0.25) mm × 1.6 ± (0.1) mm, were used, with an overlap length of 12.5 ± 0.5 mm. The tensile testing machine grips were spaced 120 mm apart, at a speed of 5 mm / min, and at a temperature of 25°C.

[0141] Table 1 Bonding strength test results of special structural adhesive for photovoltaic aluminum alloy fixtures

[0142] Bond strength / MPa Example 1 6.36 Example 2 7.14 Example 3 8.57

[0143] Test Example 2: Light aging test

[0144] The performance of the special structural adhesive for photovoltaic aluminum alloy fixtures prepared in each example was tested after curing for 5 days. The curing and curing temperature was 23±2°C and the relative humidity was 50-80%. The curing time was 5 days. For positioning time verification, 60 double-sided double-glass modules and a 1250mm*15mm aluminum profile frame were used for testing, with a 2mm adhesive thickness. The tensile strength was tested in accordance with the standard GB / T 528-2009 "Determination of tensile stress-strain properties of vulcanized rubber or thermoplastic rubber." The testing equipment included a rubber cylinder, anodized aluminum, glass, and a tensile testing machine. The test conditions were: temperature (23±2)°C and relative humidity (50±5)%.

[0145] Then test them respectively at UV60kwh / m 2 Tensile strength under conditions.

[0146] Table 2 Light aging test results of special structural adhesive for photovoltaic aluminum alloy fixtures

[0147]

[0148] Test Example 3: High Temperature Resistance Test

[0149] The tensile strength test was conducted in accordance with the standard GB / T 528-2009 “Rubber, vulcanized or thermoplastic — Determination of tensile stress-strain properties”. The test instruments used were: rubber cylinder, anodized aluminum, glass, and tensile testing machine. The test conditions were: temperature 90°C.

[0150] Table 3 High temperature resistance test results of special structural adhesive for photovoltaic aluminum alloy fixtures

[0151]

[0152] The above embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and replacements made by technicians in this field on the basis of the present invention fall within the scope of protection required by the present invention.

Claims

1. A special structural adhesive for photovoltaic aluminum alloy fixtures, consisting of component A and component B. The A component is composed of the following raw materials in percentage by weight: Room temperature vulcanized methyl silicone rubber 20-40%; Polysilicon polymer 5-15%; Aluminum hydroxide 15-25%; Silicon dioxide 5-15%; The balance is silicon carbide; The B component is composed of the following raw materials in percentage by weight: Black pigment 15-25%; 3-aminopropyltrimethoxysilane 5-15%; Dibutyltin dilaurate 2-4%; Silicon dioxide 15-25%; Methyl tributyl ketoxime silane 15-25%; The balance is vinyltributylanoxime silane; The polysilicone polymer is composed of poly(methyl 3,3,3-trifluoropropyl)siloxane and meta-xylylenediamine-modified polysilazane in a mass ratio of (1-2):(1-2).

2. The special structural adhesive for photovoltaic aluminum alloy fixtures according to claim 1, characterized in that: The mass ratio of component A to component B is (5-15):

1.

3. The method for preparing the special structural adhesive for photovoltaic aluminum alloy fixtures according to claim 1 or 2, comprising the following steps: Step 1: Mix room temperature vulcanized methyl silicone rubber, polysilicon polymer, aluminum hydroxide, silicon dioxide, and silicon carbide to prepare component A; Step 2: Mix black pigment, 3-aminopropyltrimethoxysilane, dibutyltin dilaurate, silicon dioxide, methyltributylanoxime silane, and vinyltributylanoxime silane to prepare component B; Step 3: Mix component A and component B to obtain the special structural adhesive for photovoltaic aluminum alloy fixtures.

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