Preparation method of high-strength waterproof photovoltaic support

Abstract

The application relates to the field of photovoltaic supports, in particular to a high-strength waterproof photovoltaic support and a preparation method thereof. The photovoltaic support comprises the following components in percentage by mass: 0.02-0.08% of carbon, 0.2-0.5% of silicon, 0.4-1.2% of manganese, phosphorus less than or equal to 0.02%, sulfur less than or equal to 0.005%, 0.8-2.0% of chromium, 0.1-1.0% of molybdenum, 0.1-0.4% of vanadium, 0.2-0.4% of nickel, 0.1-0.3% of niobium, nitrogen less than or equal to 0.004%, and the rest is iron and inevitable impurities. The application melts manganese, chromium, molybdenum, vanadium, zirconium, rhenium and iron ore and the like to prepare the photovoltaic support through multiple processes; the surface of the photovoltaic support is sprayed with waterproof paint to obtain the high-strength waterproof photovoltaic support. The photovoltaic support not only has corrosion resistance and excellent strength, but also has waterproof performance.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic brackets, specifically a high-strength waterproof photovoltaic bracket and its manufacturing method. Background Technology

[0002] With the rapid development of the photovoltaic industry and the growth in demand, the performance requirements for photovoltaic (PV) mounting systems are also increasing. However, traditional PV mounting systems have some problems when facing harsh environments and complex climatic conditions. Traditional PV mounting systems are susceptible to water corrosion and rainwater immersion, leading to a decrease in their stability and durability. In addition, the strength of traditional PV mounting systems may not meet the safety requirements of large-scale PV power plants.

[0003] To meet the demands for strength, stability, and durability, high-strength waterproof photovoltaic (PV) brackets have been developed. By selecting weathering steel as the primary material, its corrosion resistance and excellent strength enhance the PV bracket's corrosion resistance and extend its service life. Compared to traditional ordinary steel, weathering steel not only possesses superior corrosion resistance but also outstanding strength and durability. Even under harsh environmental conditions, weathering steel maintains the stability of the bracket structure and withstands various pressures from strong winds, torrential rains, and other natural disasters, ensuring the bracket can reliably support the photovoltaic panels during long-term use. Simultaneously, a waterproof coating is applied to the bracket's surface, forming a reliable waterproof barrier that effectively prevents rainwater penetration and protects the bracket from moisture erosion.

[0004] Compared to traditional photovoltaic (PV) mounting systems, this high-strength, waterproof system effectively addresses their shortcomings in water corrosion and strength. It not only boasts durability and stability but also adapts to various harsh environmental conditions, such as high temperature, high humidity, and strong winds. Furthermore, its installation and adjustment are more flexible and convenient, suitable for diverse terrains and site conditions. The application of this technology can improve the safety and stability of PV power plants, extend the service life of PV mounting systems, reduce operation and maintenance costs, and promote the sustainable development of the PV industry.

[0005] Therefore, we propose a high-strength waterproof photovoltaic bracket and its fabrication method. Summary of the Invention

[0006] The purpose of this invention is to provide a high-strength waterproof photovoltaic support and its manufacturing method, so as to solve the problems mentioned in the background art.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0008] A method for manufacturing a high-strength waterproof photovoltaic support includes the following steps:

[0009] S1: Manganese, chromium, molybdenum, vanadium, nickel, niobium and iron ore are put into a blast furnace and smelted at a temperature of 1250-1450℃. Carbon and silicon are added and mixed evenly, and the temperature is raised to 1500-1580℃ to obtain molten iron. The molten iron is then subjected to pretreatment, converter smelting, LF refining and RH vacuum treatment to obtain molten steel.

[0010] S2: Molten steel is continuously cast to obtain slabs; the slabs are heated and hot-rolled to obtain steel billets; the steel billets are cooled, cut, and slowly cooled to obtain steel plates.

[0011] S3: The steel plate is heated, cold-bent, straightened and then cut to a fixed length to form a bracket-type steel billet; the bracket-type steel billet is stamped to form connecting holes to obtain a bracket-type component; multiple bracket-type components are assembled to form a photovoltaic bracket.

[0012] S4: Sandblast the photovoltaic bracket to obtain a pre-treated photovoltaic bracket; spray waterproof coating onto the surface of the pre-treated photovoltaic bracket to form a waterproof coating, and after curing, obtain a high-strength waterproof photovoltaic bracket.

[0013] Furthermore, the pretreatment process conditions in step S1 are: sulfur content in molten iron ≤ 0.003%.

[0014] Furthermore, the converter smelting process conditions in step S1 are: phosphorus ≤ 0.020% and nitrogen ≤ 25ppm when tapping steel from the converter.

[0015] Furthermore, the LF refining process conditions in step S1 are: temperature 1580~1650℃, white slag holding time 15~30min, and argon gas for soft stirring for 8~15min.

[0016] Furthermore, the RH vacuum treatment process conditions in step S1 are: vacuum degree 20-100 Pa, holding time 15-30 min.

[0017] Furthermore, the continuous casting process conditions in step S2 are: tundish superheat 20-30℃, casting machine speed 0.5-1.0m / min.

[0018] Furthermore, the slab thickness in step S2 is 210 mm.

[0019] Furthermore, the heating process conditions in step S2 are: temperature 1170~1240℃, time 180~220min.

[0020] Furthermore, the hot rolling process conditions in step S2 are as follows: rough rolling and finish rolling are performed sequentially, with the final rolling temperature of rough rolling being 1020-1080℃ and the final rolling temperature of finish rolling being 870-910℃.

[0021] Furthermore, the cooling process conditions for the steel billet in step S2 are as follows: the cooling medium is water, the water temperature is 20-50℃, and the cooling termination temperature is 560-650℃.

[0022] Furthermore, the temperature of the heat treatment in step S3 is 350–450°C.

[0023] Furthermore, the cold bending forming process conditions in step S3 are as follows: a photovoltaic bracket cold bending forming machine is used, and the pressure roller group consists of 30 groups.

[0024] Furthermore, the photovoltaic support structure in step S3 comprises the following components by mass percentage:

[0025] 0.02–0.08% carbon, 0.2–0.5% silicon, 0.4–1.2% manganese, phosphorus ≤0.02%, sulfur ≤0.01%, 0.8–2.0% chromium, 0.1–1.0% molybdenum, 0.1–0.4% vanadium, 0.2–0.4% nickel, 0.1–0.3% niobium, nitrogen ≤0.004%, with the remainder being iron and unavoidable impurities.

[0026] Furthermore, the preparation process of the waterproof coating in step S4 is as follows:

[0027] Step (1): Disperse nano-silica in tetrahydrofuran and ultrasonically disperse for 20-30 min. Under nitrogen protection, add 3-glycidyl etheroxypropyltriethoxysilane dropwise, heat to 75-85℃, and add dropwise over 1-2 h. Then add dodecafluoroheptylpropylmethyldimethoxysilane and mix evenly. Keep the reaction at this temperature for 2-4 h. After centrifugation and washing, dry under vacuum at 60-70℃ for 24-48 h to obtain modified nano-silica.

[0028] Step (2): Disperse the modified nano silica obtained in step (1) in ethanol, ultrasonically disperse for 10-15 min, add a mixed solution of xylene and epoxy resin, and stir for 20-40 min.

[0029] Step (3): Add sodium carboxymethyl cellulose and alumina, stir for 20-30 minutes, then add antioxidant, curing agent and deionized water and mix evenly. Perform ultrasonic treatment for 5-10 minutes to obtain waterproof coating.

[0030] Furthermore, the waterproof coating comprises the following components by weight: 6-10 parts of nano-silica, 40-60 parts of tetrahydrofuran, 2-4 parts of 3-glycidyl etheroxypropyltriethoxysilane, 3-5 parts of dodecafluoroheptylpropylmethyldimethoxysilane, 25-50 parts of ethanol, 60-90 parts of xylene, 10-15 parts of epoxy resin, 3-5 parts of sodium carboxymethyl cellulose, 1-3 parts of alumina, 0.1-0.3 parts of antioxidant, 3-7 parts of curing agent, and 50-60 parts of deionized water.

[0031] Furthermore, the antioxidant is antioxidant 1010.

[0032] Furthermore, the curing agent is polyamide 650.

[0033] Furthermore, the thickness of the waterproof coating in step S4 is 60–80 μm.

[0034] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0035] 1. This invention discloses a high-strength waterproof photovoltaic bracket and its manufacturing process. The process involves smelting manganese, chromium, molybdenum, vanadium, nickel, niobium, and iron ore, then adding carbon and silicon to obtain molten iron. This molten iron is then subjected to pretreatment, converter smelting, LF refining, and RH vacuum treatment to obtain molten steel. These processes remove impurities and non-metallic substances, improving the quality and purity of the molten steel, and enhancing its mechanical properties and corrosion resistance. The molten steel is then continuously cast, heated, and hot-rolled to obtain steel billets, allowing for adjustments to the width, thickness, and mechanical properties of the material. The steel billets are then cooled. The process involves cutting, slow cooling, and preparing steel plates to further improve surface quality and dimensional accuracy. The steel plates are then heat-treated, cold-bent, straightened, and cut to length to form support-type steel billets. These processes ensure the billet's shape and dimensions meet design requirements, guaranteeing the structural stability and assemblability of the photovoltaic support system. The support-type steel billets are then stamped to create connecting holes, producing support-type modules. Multiple support-type modules are assembled to form the photovoltaic support system. Finally, a waterproof coating is applied to the photovoltaic support system surface to improve its hydrophobicity and corrosion resistance. This photovoltaic support system possesses high strength and waterproof performance, providing stable support and protection for the photovoltaic modules, maintaining long-term stable operation under various environmental conditions.

[0036] 2. This invention discloses a high-strength waterproof photovoltaic bracket and its preparation process. The process involves grafting epoxy groups of 3-glycidyl etheroxypropyltriethoxysilane onto the surface of nano-silica, followed by reaction with dodecylfluoroheptylpropylmethyldimethoxysilane to introduce hydrophobic groups, thus obtaining hydrophobic modified nano-silica. Next, epoxy resin is used as a binder, sodium carboxymethyl cellulose and alumina as fillers, and antioxidant 1010, polyamide 650 curing agent, and deionized water are added to prepare a waterproof coating. These components work together to improve the coating's performance. Simultaneously, the polyamide 650 curing agent can undergo epoxy ring-opening reactions with both the epoxy resin and the epoxy groups on the nano-silica, forming an organic-inorganic composite nanonetwork, further improving the coating's corrosion resistance, adhesion, and hydrophobic properties. Detailed Implementation

[0037] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] In this embodiment, manganese is sourced from: electrolytic manganese flakes with a manganese content ≥99.9%, sourced from Suzhou Rongqian Rare Metals Products Co., Ltd.; chromium is sourced from: chromium blocks with a chromium content ≥99.9%, sourced from Beijing Xingrongyuan Technology Co., Ltd.; molybdenum is sourced from: molybdenum granules with a molybdenum content ≥99.95%, sourced from Beijing Xingrongyuan Technology Co., Ltd.; vanadium is sourced from: vanadium blocks with a vanadium content ≥99.5%, sourced from Qinghe Benyu Metal Materials Co., Ltd.; nickel is sourced from: nickel beads with a nickel content ≥99.9%, sourced from Beijing Xingrongyuan Technology Co., Ltd.; niobium is sourced from: niobium rods with a niobium content ≥99.95%, sourced from Shaanxi Xinbaoying Metal Materials Co., Ltd.; iron ore is sourced from: iron content ≥60%, sourced from Henan Denuo Metallurgical Materials Co., Ltd.; and carbon is sourced from: graphite with a fixed carbon content of 99.99%, item number 42, sourced from Taizhou Hongnaide Carbon Products Co., Ltd. Company; Silicon: Silicon blocks, silicon content ≥99.9%, sourced from Qinghe County Chuangying Metal Materials Co., Ltd.; Nano-silica: content ≥99.9%, particle size 20-50nm, sourced from Shanghai Naio Nanotechnology Co., Ltd.; Epoxy resin: Phoenix 6101 epoxy resin, epoxy equivalent 210-230g / mol, sourced from Jiangyin Wanqian Chemical Co., Ltd.; Sodium carboxymethyl cellulose: MV-CMC, particle size 80 mesh, sourced from Sichuan Lanyang Daily Chemical Co., Ltd.; Alumina: High-purity ultrafine alumina powder, content ≥99.9%, particle size 100 mesh, sourced from Hebei Ruixiang Alloy Materials Co., Ltd.; Antioxidant: Antioxidant 1010, sourced from Shijiazhuang Taisheng Chemical Co., Ltd.; Curing agent: Polyamide 650, sourced from Guangzhou Haihong Chemical Co., Ltd.

[0039] In the following examples and comparative examples, 1 part equals 10g.

[0040] Example 1: A method for manufacturing a high-strength waterproof photovoltaic bracket, comprising the following processes:

[0041] S1: Manganese, chromium, molybdenum, vanadium, nickel, niobium and iron ore are put into a blast furnace and smelted at 1250℃. Carbon and silicon are added and mixed evenly, and the temperature is raised to 1500℃ to obtain molten iron. The molten iron is then subjected to pretreatment (sulfur ≤0.003% in molten iron), converter smelting (phosphorus ≤0.020% and nitrogen ≤25ppm when tapping steel from the converter), LF refining (temperature 1580℃, white slag holding time 15min, soft stirring with argon gas for 8min), and RH vacuum treatment (vacuum degree 20Pa, holding time 15min) to obtain molten steel.

[0042] S2: Molten steel is continuously cast (tundish superheating 20℃, casting machine speed 0.5m / min) to obtain slabs; the slabs are then heated (temperature 1170℃, time 180min) and hot rolled (rough rolling and finish rolling in sequence, rough rolling final rolling temperature 1020℃, finish rolling final rolling temperature 870℃) to obtain steel billets; the steel billets are then cooled (cooling medium is water, water temperature is 20℃, cooling termination temperature is 560℃), cut, and slowly cooled to obtain steel plates;

[0043] S3: The steel plate is heated (at 350℃), then straightened after cold bending, and then cut to a fixed length to form a bracket-type steel billet; the bracket-type steel billet is stamped to form connecting holes to obtain a bracket-type component; multiple bracket-type components are assembled to form a photovoltaic bracket.

[0044] The photovoltaic mounting system comprises the following components by weight percentage:

[0045] 0.02% carbon, 0.2% silicon, 0.4% manganese, 0.02% phosphorus, 0.01% sulfur, 0.8% chromium, 0.1% molybdenum, 0.1% vanadium, 0.2% nickel, 0.1% niobium, 0.004% nitrogen, the remainder being iron and unavoidable impurities;

[0046] S4: Sandblast the photovoltaic bracket to obtain a pre-treated photovoltaic bracket; spray waterproof coating onto the surface of the pre-treated photovoltaic bracket to form a waterproof coating, and after curing, obtain a high-strength waterproof photovoltaic bracket;

[0047] The preparation process of the waterproof coating in step S4 is as follows:

[0048] Step (1): Disperse 6 parts of nano silica in 40 parts of tetrahydrofuran, sonicate for 20 min, add 2 parts of 3-glycidyl etheroxypropyltriethoxysilane dropwise under nitrogen protection, heat to 75℃, dropwise for 1 h, then add 3 parts of dodecafluoroheptylpropylmethyldimethoxysilane and mix evenly, keep warm for 2 h, centrifuge and wash, then vacuum dry at 60℃ for 24 h to obtain modified nano silica;

[0049] Step (2): Disperse the modified nano silica obtained in step (1) in 25 parts of ethanol, ultrasonically disperse for 10 min, add 60 parts of xylene and 10 parts of epoxy resin mixed solution, and stir for 20 min.

[0050] Step (3): Add 3 parts sodium carboxymethyl cellulose and 1 part alumina, stir for 20 minutes, then add 0.1 parts antioxidant 1010, 3 parts polyamide 650 curing agent and 50 parts deionized water and mix evenly. Perform ultrasonic treatment for 5 minutes to obtain waterproof coating.

[0051] Example 2: A method for manufacturing a high-strength waterproof photovoltaic bracket, comprising the following processes:

[0052] S1: Manganese, chromium, molybdenum, vanadium, nickel, niobium and iron ore are put into a blast furnace and smelted at 1350℃. Carbon and silicon are added and mixed evenly, and the temperature is raised to 1550℃ to obtain molten iron. The molten iron is then subjected to pretreatment (sulfur ≤0.003% in molten iron), converter smelting (phosphorus ≤0.020% and nitrogen ≤25ppm when tapping steel from the converter), LF refining (temperature 1600℃, white slag holding time 20min, soft stirring with argon gas for 10min), and RH vacuum treatment (vacuum degree 60Pa, holding time 20min) to obtain molten steel.

[0053] S2: Molten steel is continuously cast (tundish superheating 25℃, casting machine speed 0.8m / min) to obtain slabs; the slabs are then heated (temperature 1200℃, time 200min) and hot rolled (rough rolling and finish rolling in sequence, rough rolling final rolling temperature 1060℃, finish rolling final rolling temperature 890℃) to obtain steel billets; the steel billets are then cooled (cooling medium is water, water temperature is 40℃, cooling termination temperature is 600℃), cut, and slowly cooled to obtain steel plates;

[0054] S3: The steel plate is heated (at 400℃), then cold-bent and straightened, and then cut to a fixed length to form a bracket-type steel billet; the bracket-type steel billet is stamped to form connecting holes to obtain a bracket-type component; multiple bracket-type components are assembled to form a photovoltaic bracket.

[0055] The photovoltaic mounting system comprises the following components by weight percentage:

[0056] 0.06% carbon, 0.3% silicon, 0.8% manganese, 0.01% phosphorus, 0.005% sulfur, 1.0% chromium, 0.5% molybdenum, 0.3% vanadium, 0.3% nickel, 0.2% niobium, 0.003% nitrogen, the remainder being iron and unavoidable impurities;

[0057] S4: Sandblast the photovoltaic bracket to obtain a pre-treated photovoltaic bracket; spray waterproof coating onto the surface of the pre-treated photovoltaic bracket to form a waterproof coating, and after curing, obtain a high-strength waterproof photovoltaic bracket;

[0058] The preparation process of the waterproof coating in step S4 is as follows:

[0059] Step (1): Disperse 8 parts of nano silica in 50 parts of tetrahydrofuran, sonicate for 25 min, add 3 parts of 3-glycidyl etheroxypropyltriethoxysilane dropwise under nitrogen protection, heat to 80℃, and dropwise for 1.5 h. Then add 4 parts of dodecafluoroheptylpropylmethyldimethoxysilane and mix evenly. Keep the reaction at the temperature for 3 h. After centrifugation and washing, dry under vacuum at 65℃ for 36 h to obtain modified nano silica.

[0060] Step (2): Disperse the modified nano silica obtained in step (1) in 40 parts of ethanol and ultrasonically disperse for 12 min; add a mixed solution of 80 parts of xylene and 13 parts of epoxy resin and stir for 30 min.

[0061] Step (3): Add 4 parts of sodium carboxymethyl cellulose and 2 parts of alumina, stir for 25 minutes, then add 0.2 parts of antioxidant 1010, 5 parts of polyamide 650 curing agent and 55 parts of deionized water, mix evenly, and perform ultrasonic treatment for 8 minutes to obtain waterproof coating.

[0062] Example 3: A method for manufacturing a high-strength waterproof photovoltaic bracket, comprising the following processes:

[0063] S1: Manganese, chromium, molybdenum, vanadium, nickel, niobium and iron ore are put into a blast furnace and smelted at 1450℃. Carbon and silicon are added and mixed evenly, and the temperature is raised to 1580℃ to obtain molten iron. The molten iron is then subjected to pretreatment (sulfur ≤0.003% in molten iron), converter smelting (phosphorus ≤0.020% and nitrogen ≤25ppm when tapping steel from the converter), LF refining (temperature 1650℃, white slag holding time 30min, soft stirring with argon gas for 15min), and RH vacuum treatment (vacuum degree 100Pa, holding time 30min) to obtain molten steel.

[0064] S2: Molten steel is continuously cast (tundish superheating 30℃, casting machine speed 1.0m / min) to obtain slabs; the slabs are then heated (temperature 1240℃, time 220min) and hot rolled (rough rolling and finish rolling in sequence, rough rolling final rolling temperature 1080℃, finish rolling final rolling temperature 910℃) to obtain steel billets; the steel billets are then cooled (cooling medium is water, water temperature is 50℃, cooling termination temperature is 650℃), cut, and slowly cooled to obtain steel plates;

[0065] S3: The steel plate is heated, cold-bent, straightened and then cut to a fixed length to form a bracket-type steel billet; the bracket-type steel billet is stamped to form connecting holes to obtain a bracket-type component; multiple bracket-type components are assembled to form a photovoltaic bracket.

[0066] The photovoltaic mounting system comprises the following components by weight percentage:

[0067] 0.08% carbon, 0.5% silicon, 1.2% manganese, 0.005% phosphorus, 0.004% sulfur, 2.0% chromium, 1.0% molybdenum, 0.4% vanadium, 0.4% nickel, 0.3% niobium, 0.002% nitrogen, the remainder being iron and unavoidable impurities;

[0068] S4: Sandblast the photovoltaic bracket to obtain a pre-treated photovoltaic bracket; spray waterproof coating onto the surface of the pre-treated photovoltaic bracket to form a waterproof coating, and after curing, obtain a high-strength waterproof photovoltaic bracket;

[0069] The preparation process of the waterproof coating in step S4 is as follows:

[0070] Step (1): Disperse 10 parts of nano silica in 60 parts of tetrahydrofuran, sonicate for 30 min, add 4 parts of 3-glycidyl etheroxypropyltriethoxysilane dropwise under nitrogen protection, heat to 85℃, dropwise for 2 h, then add 5 parts of dodecafluoroheptylpropylmethyldimethoxysilane and mix evenly, keep warm for 4 h, centrifuge and wash, then vacuum dry at 70℃ for 48 h to obtain modified nano silica;

[0071] Step (2): Disperse the modified nano-silica in 50 parts of ethanol and ultrasonically disperse for 15 min; add a mixed solution of 90 parts of xylene and 15 parts of epoxy resin and stir for 40 min;

[0072] Step (3): Add 5 parts sodium carboxymethyl cellulose and 3 parts alumina, stir for 30 minutes, then add 0.3 parts antioxidant 1010, 7 parts polyamide 650 curing agent and 60 parts deionized water and mix evenly. Perform ultrasonic treatment for 10 minutes to obtain waterproof coating.

[0073] Comparative Example 1: The photovoltaic mounting system comprises the following components by weight percentage:

[0074] 0.01% carbon, 0.1% silicon, 0.1% manganese, 0.05% phosphorus, 0.05% sulfur, 0.2% chromium, 0.05% molybdenum, 0.05% vanadium, 0.05% nickel, 0.05% niobium, 0.006% nitrogen, the remainder being iron and unavoidable impurities;

[0075] The other steps and processes are the same as in Example 1.

[0076] Comparative Example 2: The photovoltaic mounting system comprises the following components by weight percentage:

[0077] 0.06% carbon, 0.3% silicon, 0.8% manganese, 0.01% phosphorus, 0.005% sulfur, 1.0% copper, 0.5% magnesium, 0.3% vanadium, 0.3% nickel, 0.2% niobium, 0.003% nitrogen, the remainder being iron and unavoidable impurities;

[0078] Compared with Example 2, Comparative Example 2 replaced chromium with copper and molybdenum with magnesium, while other steps and processes were the same as in Example 2.

[0079] Comparative Example 3: The waterproof coating comprises the following components by weight: 8 parts nano silica, 50 parts tetrahydrofuran, 3 parts 3-glycidyl etheroxypropyltriethoxysilane, 4 parts dodecafluoroheptylpropylmethyldimethoxysilane, 40 parts ethanol, 80 parts xylene, 13 parts epoxy resin, 4 parts sodium carboxymethyl cellulose, 2 parts alumina, 5 parts curing agent, 0.2 parts antioxidant, and 55 parts deionized water;

[0080] Compared with Example 2, Comparative Example 3 did not add dodecafluoroheptylpropylmethyldimethoxysilane, but the other steps and processes were the same as in Example 2.

[0081] Comparative Example 4: A method for manufacturing a high-strength waterproof photovoltaic bracket, comprising the following processes:

[0082] Compared with Example 2, Comparative Example 4 omits the preparation process of the waterproof coating in step S4, and uses K11 polyurethane waterproof coating (from Fangmiao New Materials Development Group Co., Ltd.) to spray on the surface of the pretreated photovoltaic bracket. Other steps are the same as in Example 2.

[0083] experiment

[0084] Photovoltaic brackets obtained in Examples 1-3 and Comparative Examples 1-4 were used to prepare samples, and their performance was tested and the test results were recorded:

[0085] The tensile strength was tested according to GB / T 228.1-2010 "Metallic materials, tensile testing—Part 1: Test at room temperature". The experimental procedure was as follows: Cut a specimen with dimensions of 50 mm long × 10 mm wide × 3 mm thick. Mount the specimen on the tensile testing machine and apply a loading speed of 10 mm / min. Gradually increase the external force until the specimen fractures. Record the mechanical properties of the specimen using the testing machine.

[0086] The corrosion resistance was tested according to the ASTM B17-2011 salt spray test standard. The experimental procedure was as follows: 80mm × 100mm specimens were cut and placed in a salt spray test chamber for 72 hours. The corrosion condition of the sample surface was checked periodically, and any visible corrosion, rust, or coating damage was recorded to assess the corrosion resistance. The results were categorized as follows: No corrosion: No visible corrosion or changes on the sample surface; the material has good corrosion resistance. Minor corrosion: Slight corrosion appears on the sample surface, generally as small spots or oxidation. Significant corrosion: Obvious corrosion appears on the sample surface; there may be rusted areas or obvious color changes.

[0087] Following the standard test method of ASTM D5725-99 (2003) for determining the wettability and absorbency of a covering material surface using an automatic contact angle tester, the hydrophobic properties were tested. The experimental procedure was as follows: A water droplet was placed on the surface of the photovoltaic support. Before starting the measurement, the droplet was allowed to remain on the surface for a period of time to ensure that it reached equilibrium with the surface. The contact angle formed by the droplet and the surface was measured using a measuring instrument, and the data was recorded.

[0088] Tensile strength / MPa Corrosion Contact angle / ° Example 1 673 Non-corrosive 150 Example 2 678 Non-corrosive 152 Example 3 675 Non-corrosive 151 Comparative Example 1 552 Significant corrosion 148 Comparative Example 2 574 Micro corrosion 135 Comparative Example 3 655 Micro corrosion 94 Comparative Example 4 663 Micro corrosion 116

[0089] Based on the data in the table above, the following conclusions can be clearly drawn:

[0090] 1. Compared with Comparative Example 1, the tensile strength of the samples in Examples 1 to 3 increased, the corrosion resistance was better, and the contact angle was larger. This indicates that the performance of the photovoltaic bracket prepared by the present invention is affected by its component ratio. By selecting the component ratio within the range described above, the prepared product has excellent tensile strength, corrosion resistance, and excellent hydrophobic properties.

[0091] 2. Compared with Examples 1 to 3, the tensile strength, corrosion condition and contact angle of the sample in Comparative Example 2 decreased to varying degrees. It can be seen that the addition of molybdenum and chromium in the present invention can improve the performance of the product more than copper and magnesium. The contact angle of the sample in Comparative Example 3 decreased significantly. It can be seen that the addition of dodecafluoroheptylpropylmethyldimethoxysilane in the present invention introduces hydrophobic groups and improves the hydrophobic properties of the product.

[0092] 3. Compared with Examples 1 to 3, the contact angle of the product obtained in Comparative Example 4 decreased and the corrosion resistance decreased. It can be seen that, compared with K11 polyurethane waterproof coating, the waterproof coating prepared by the present invention has better corrosion resistance and hydrophobic properties.

[0093] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process method article or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process method article or apparatus.

[0094] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for manufacturing a high-strength waterproof photovoltaic bracket, characterized in that: Includes the following steps: S1: Manganese, chromium, molybdenum, vanadium, nickel, niobium and iron ore are placed in a blast furnace and smelted at a temperature of 1250-1450℃. Carbon and silicon are added and mixed evenly, and the temperature is raised to 1500-1580℃ to obtain molten iron. The molten iron is then subjected to pretreatment, converter smelting, LF refining and RH vacuum treatment to obtain molten steel. S2: Molten steel is continuously cast to obtain slabs; the slabs are heated and hot-rolled to obtain steel billets; the steel billets are cooled, cut, and slowly cooled to obtain steel plates. S3: The steel plate is heated, cold-bent, straightened and then cut to a fixed length to form a bracket-type steel billet; the bracket-type steel billet is stamped to form connecting holes to obtain a bracket-type component; multiple bracket-type components are assembled to form a photovoltaic bracket. S4: Sandblast the photovoltaic bracket to obtain a pre-treated photovoltaic bracket; spray waterproof coating onto the surface of the pre-treated photovoltaic bracket to form a waterproof coating, and after curing, obtain a high-strength waterproof photovoltaic bracket; The preparation process of the waterproof coating in step S4 is as follows: Step 1: Disperse nano-silica in tetrahydrofuran and sonicate for 20-30 min. Under nitrogen protection, add 3-glycidyl etheroxypropyltriethoxysilane dropwise, heat to 75-85℃, and add the mixture over 1-2 h. Then add dodecafluoroheptylpropylmethyldimethoxysilane and mix well. Keep the mixture warm for 2-4 h. After centrifugation and washing, dry under vacuum at 60-70℃ for 24-48 h to obtain modified nano-silica. Step 2: Disperse the modified nano-silica obtained in Step 1 in ethanol, ultrasonically disperse for 10-15 min, add a mixed solution of xylene and epoxy resin, and stir for 20-40 min. Step 3: Add sodium carboxymethyl cellulose and alumina, stir for 20-30 minutes, then add antioxidant, curing agent and deionized water and mix evenly. Perform ultrasonic treatment for 5-10 minutes to obtain waterproof coating.

2. The method for preparing a high-strength waterproof photovoltaic bracket according to claim 1, characterized in that: The RH vacuum treatment process conditions in step S1 are: vacuum degree 20-100 Pa, holding time 15-30 min.

3. The method for preparing a high-strength waterproof photovoltaic bracket according to claim 1, characterized in that: The heating process conditions in step S2 are: temperature 1170~1240℃, time 180~220min.

4. The method for preparing a high-strength waterproof photovoltaic bracket according to claim 1, characterized in that: The hot rolling process conditions in step S2 are as follows: rough rolling and finish rolling are performed sequentially, with the final rolling temperature of rough rolling being 1020-1080℃ and the final rolling temperature of finish rolling being 870-910℃.

5. The method for preparing a high-strength waterproof photovoltaic bracket according to claim 1, characterized in that: The cooling process conditions for the steel billet in step S2 are as follows: the cooling medium is water, the water temperature is 20-50℃, and the cooling termination temperature is 560-650℃.

6. The method for preparing a high-strength waterproof photovoltaic bracket according to claim 1, characterized in that: The cold bending forming process conditions in step S3 are as follows: a photovoltaic bracket cold bending forming machine is used, and the pressure roller group is 30 groups.

7. The method for preparing a high-strength waterproof photovoltaic bracket according to claim 1, characterized in that: The photovoltaic support structure in step S3 comprises the following components by mass percentage: 0.02–0.08% carbon, 0.2–0.5% silicon, 0.4–1.2% manganese, phosphorus ≤0.02%, sulfur ≤0.01%, 0.8–2.0% chromium, 0.1–1.0% molybdenum, 0.1–0.4% vanadium, 0.2–0.4% nickel, 0.1–0.3% niobium, nitrogen ≤0.004%, with the remainder being iron and unavoidable impurities.

8. The method for preparing a high-strength waterproof photovoltaic bracket according to claim 1, characterized in that: The waterproof coating comprises the following components by weight: 6-10 parts nano silica, 40-60 parts tetrahydrofuran, 2-4 parts 3-glycidyl etheroxypropyltriethoxysilane, 3-5 parts dodecylfluoroheptylpropylmethyldimethoxysilane, 25-50 parts ethanol, 60-90 parts xylene, 10-15 parts epoxy resin, 3-5 parts sodium carboxymethyl cellulose, 1-3 parts alumina, 0.1-0.3 parts antioxidant, 3-7 parts curing agent, and 50-60 parts deionized water.