Color-coated sheet for photovoltaic water chute

Abstract

The utility model provides a color-coated plate for a photovoltaic water chute, and belongs to the field of color steel plates. The color-coated sheet comprises a steel base plate, and a composite finish paint coating and a back varnish coating which are coated on two opposite sides of the steel base plate along the thickness direction of the steel base plate, the color-coated sheet further comprises a first pretreatment layer arranged between the composite finish paint coating and the steel substrate and / or a second pretreatment layer arranged between the back varnish coating and the steel substrate. The structure of the color-coated plate for the photovoltaic water chute is reasonably designed, the metal texture and zinc patterns of the coating can be reserved through the single-layer varnish, part of sunlight is reflected, and the generating capacity of a solar cell panel is improved; and the attractive appearance and the weather resistance are provided through the composite finishing coat coating. Therefore, the requirements for corrosion resistance, surface effect, water conductivity and trimming protectiveness of the photovoltaic water chute can be met, and meanwhile spraying for corrosion prevention after installation is not needed.

Description

Technical Field

[0001] This utility model relates to the field of colored steel plate technology, and in particular to a colored steel plate for photovoltaic water guiding channels. Background Technology

[0002] Photovoltaic solar panels have poor waterproofing. During the rainy season, if water cannot be drained in time, it can lead to a decrease in the power generation efficiency of the solar panels or even damage, and cause leaks in the user's roof. Therefore, a large number of drainage channels are needed in the process of photovoltaic roof integration. At the same time, GB50797-2012 "Design Code for Photovoltaic Power Stations" requires that the design service life of photovoltaic brackets be 25 years. However, the service life of conventional photovoltaic accessory drainage channels is currently insufficient, or the coating thickness needs to be increased to achieve the long service life requirement, which brings about increased costs, increased weight, and installation inconvenience.

[0003] The current traditional process for processing photovoltaic water channels involves uncoiling cold-rolled steel sheets, punching, roll forming, on-site assembly, coating, and drying. Traditional photovoltaic water channels generate significant amounts of hazardous waste during the coating process, while also increasing labor and time costs. Furthermore, the protection around the punched areas is inadequate, and the coating's appearance and corrosion resistance are poor. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a color-coated plate for photovoltaic water guiding channels, which can meet the requirements of corrosion resistance, surface effect, water guiding performance and edge protection of photovoltaic water guiding channels, and at the same time, it eliminates the need for anti-corrosion spraying after installation.

[0005] The solution to achieve the technical objective of this utility model is a color-coated plate for photovoltaic water guiding channels, the color-coated plate comprising: a steel substrate and a composite topcoat coating and a back varnish coating coated on opposite sides of the steel substrate along the thickness direction of the steel substrate.

[0006] The color-coated plate further includes: a first pretreatment layer disposed between the composite topcoat coating and the steel substrate and / or a second pretreatment layer disposed between the back clear coat coating and the steel substrate.

[0007] In some embodiments, the color-coated sheet includes: a first pretreatment layer and a second pretreatment layer, both of which are chemical passivation layers, and the thickness of the chemical passivation layer is 0.7 μm to 1.5 μm.

[0008] In some embodiments, the thickness of the back varnish coating is 4 μm to 11 μm.

[0009] In some embodiments, the steel substrate includes: a cold-rolled sheet and a high-aluminum-zinc-aluminum-magnesium hot-dip galvanized layer coated on opposite sides of the cold-rolled sheet along the thickness direction of the cold-rolled sheet.

[0010] In some embodiments, the macroscopic morphology of the high-aluminum-zinc-aluminum-magnesium hot-dip coating is a micro-three-dimensional zinc flower texture, with 70 to 115 zinc flowers per 10cm length.

[0011] In some embodiments, the composite topcoat coating includes: a primer layer coated on the first pretreatment layer, a topcoat layer coated on the primer layer, a cold-coating adhesive layer coated on the topcoat layer, and a cold-coating film coated on the cold-coating adhesive layer.

[0012] In some embodiments, the primer layer is a polyurethane primer layer or an epoxy polyester primer layer, and the thickness of the primer layer is 3μm to 10μm.

[0013] In some embodiments, the topcoat layer is a pure acrylic water-based resin topcoat layer or a polyurethane-modified acrylic resin topcoat layer, and the thickness of the topcoat layer is 12μm to 23μm.

[0014] In some embodiments, the sum of the thicknesses of the primer layer and the topcoat layer is 15 μm to 33 μm.

[0015] In some embodiments, the thickness of the cold-coating film is 3 μm to 10 μm.

[0016] The technical solutions provided in this application have the following advantages compared with the prior art:

[0017] This application provides a color-coated steel sheet for photovoltaic water guiding channels. The structure of the color-coated steel sheet is rationally designed. A single layer of clear varnish preserves the metallic texture and zinc pattern of the plating, reflecting some sunlight and increasing the power generation of the solar panel. A composite topcoat provides an aesthetically pleasing appearance and weather resistance. A pretreatment layer enhances the adhesion between the composite topcoat and the back clear varnish coating and the steel substrate, improving the overall performance of the color-coated steel sheet. This satisfies the requirements of photovoltaic water guiding channels for corrosion resistance, surface finish, water conductivity, and edge protection, while eliminating the need for post-installation anti-corrosion coating. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a first structural schematic diagram of the color steel plate used for photovoltaic water guiding channels provided in an embodiment of this application;

[0021] Figure 2 This is a schematic diagram of the second structure of the color steel plate for the photovoltaic water guiding channel provided in the embodiments of this application;

[0022] Figure 3 A physical image of the color steel plate used for the photovoltaic water guiding channel provided in the embodiments of this application;

[0023] Figure 4 A physical image of an existing photovoltaic water channel provided for an embodiment of this application;

[0024] Figure label:

[0025] 10-Steel substrate, 101-Cold-rolled sheet, 102-High aluminum zinc aluminum magnesium hot-dip galvanized layer, 20-Pretreatment layer, 30-Back clear varnish coating, 40-Composite topcoat coating, 401-Primer layer, 402-Topcoat layer, 403-Cold laminating adhesive layer, 404-Cold laminating. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0027] Various embodiments of this application may exist in the form of a range; it should be understood that the description in the form of a range is merely for convenience and brevity and should not be construed as a hard limitation on the scope of this application; therefore, it should be considered that the range description has specifically disclosed all possible sub-ranges and single numerical values ​​within that range. For example, it should be considered that the range description from 1 to 6 has specifically disclosed sub-ranges such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., and single numbers within the range, such as 1, 2, 3, 4, 5, and 6, regardless of the range. Furthermore, whenever a numerical range is referred to herein, it means including any referenced number (fraction or integer) within the range referred to.

[0028] Furthermore, in the description of this application, the terms "comprising" and "including" mean "including but not limited to". In this document, relational terms such as "first" and "second" are used merely 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. In this document, "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Here, A and B can be singular or plural.

[0029] Unless otherwise specified, all raw materials, reagents, instruments and equipment used in this application can be purchased from the market or prepared by existing methods.

[0030] Figure 1 This is a first structural schematic diagram of the color steel plate used for photovoltaic water guiding channels provided in an embodiment of this application.

[0031] like Figure 1 As shown, this utility model provides a color-coated plate for photovoltaic water guiding channels. The color-coated plate includes: a steel substrate 10 and a composite topcoat coating 40 and a back clear varnish coating 30 coated on opposite sides of the steel substrate 10 along the thickness direction of the steel substrate 10.

[0032] The color-coated plate further includes: a first pretreatment layer 20 disposed between the composite topcoat coating 40 and the steel substrate 10 and / or a second pretreatment layer 20 disposed between the back clear coat coating 30 and the steel substrate 10.

[0033] In some embodiments, the back varnish coating 30 is a single-layer varnish coating rich in hydrophobic agents.

[0034] Composite topcoat coating 40: Coated on one side of the steel substrate 10, providing an attractive appearance and weather resistance.

[0035] Back clear varnish coating 30: Coated on the other side of the steel substrate 10, it can retain the metallic texture and zinc pattern of the plating. In actual use, it can reflect some sunlight and increase the power generation of the solar panel. At the same time, the hydrophobic additives in the paint can increase the crosslinking density of the paint film, reduce the surface free energy of the coating surface, and have excellent anti-fouling performance and good rainwater self-cleaning function.

[0036] First pretreatment layer 20 and second pretreatment layer 20: These two pretreatment layers 20 can exist alone or simultaneously. Their main function is to enhance the bonding force between the composite topcoat coating 40 and the back clear varnish coating 30 and the steel substrate 10, thereby improving the overall performance of the color-coated plate.

[0037] In some embodiments, the color-coated plate includes: a first pretreatment layer 20 and a second pretreatment layer 20, both of which are chemical passivation layers, and the thickness of the chemical passivation layer is 0.7 μm to 1.5 μm.

[0038] When the pretreatment layer 20 is a chemical passivation layer, it can form a dense oxide film on the surface of the steel substrate 10, enhancing the adhesion between the composite topcoat coating 40 and the back clear coat coating 30 and the steel substrate 10, while further improving the corrosion resistance and weather resistance of the color-coated steel sheet. The thickness of the chemical passivation layer is 0.7 μm to 1.5 μm. This range ensures the effectiveness of the pretreatment layer 20 while avoiding increased cost and performance degradation due to excessive thickness. For example, the thickness of the chemical passivation layer can be 0.7 μm, 0.9 μm, 1.0 μm, 1.2 μm, 1.4 μm, 1.5 μm, etc.

[0039] In some embodiments, the thickness of the back varnish coating 30 is 4 μm to 11 μm.

[0040] The thickness of the back clear coat 30 is limited to 4μm to 11μm, which ensures the functionality of the clear coat layer while avoiding increased costs and processing difficulties caused by excessive thickness. At the same time, it also provides sufficient water repellency and stain resistance. For example, the thickness of the back clear coat 30 can be 4μm, 6μm, 8μm, 10μm, 11μm, etc.

[0041] In some embodiments, the steel substrate 10 includes: a cold-rolled sheet 101 and a high-aluminum-zinc-aluminum-magnesium hot-dip galvanized layer 102 coated on opposite sides of the cold-rolled sheet 101 along the thickness direction of the cold-rolled sheet 101.

[0042] High-aluminum zinc-aluminum-magnesium hot-dip galvanized coating 102 is an alloy coating formed by adding a certain amount of magnesium and other elements to hot-dip aluminum-zinc galvanized coating. Its main components include zinc (Zn), aluminum (Al), and magnesium (Mg), with aluminum content typically higher, generally above 50%, while the magnesium content is adjusted according to specific requirements. This coating not only possesses the corrosion resistance of zinc but also combines the excellent properties of aluminum and magnesium, resulting in a significant improvement in overall performance.

[0043] In some embodiments, the high-aluminum zinc-aluminum-magnesium hot-dip coating 102 is composed of the following chemical composition by weight percentage: Al: 53%–57%, Mg: 0.8%–2.0%, Si: 1.4%–1.8%, with the remainder being Zn and unavoidable impurities.

[0044] The synergistic effect of elements such as Al, Mg, and Si in the coating composition improves the corrosion resistance of the coating. In particular, the Mg element improves the corrosion resistance of the plane and reduces the generation of Fe2O3 at the cut, thus extending the service life of the color-coated sheet.

[0045] In some embodiments, the macroscopic morphology of the high-aluminum-zinc-aluminum-magnesium hot-dip coating 102 is a micro-three-dimensional zinc flower texture, with 70 to 115 zinc flowers per 10cm length.

[0046] The micro-three-dimensional zinc flower texture is not only aesthetically pleasing, but also enhances the adhesion between the primer layer 401 and the substrate, reduces the risk of corrosion products spreading from the substrate surface, and improves the overall performance of the color-coated sheet. For example, based on a length of 10cm, the number of zinc flowers can be 70, 80, 85, 95, 105, 115, etc.

[0047] In some embodiments, the composite topcoat coating 40 includes: a primer layer 401 coated on the first pretreatment layer 20, a topcoat layer 402 coated on the primer layer 401, a special adhesive layer 403 for cold lamination 404 coated on the topcoat layer 402, and a cold lamination 404 coated on the special adhesive layer 403 for cold lamination 404.

[0048] The primer layer 401, as the first layer of the composite topcoat coating 40, is directly applied to the first pretreatment layer 20. The primer layer 401 can significantly improve the adhesion between the coating and the substrate, ensuring that the subsequent coating can adhere firmly to the substrate. At the same time, the primer layer 401 can fill in minor defects on the surface of the substrate, making it smoother and providing a better foundation for the subsequent topcoat layer 402.

[0049] Topcoat layer 402 is the second layer of the composite topcoat coating 40, applied over primer layer 401. Topcoat layer 402 forms a dense protective film, preventing further erosion of primer layer 401 by the external environment. Simultaneously, topcoat layer 402 typically exhibits good weather resistance, resisting ultraviolet radiation, temperature changes, and chemical corrosion, thereby extending the service life of the coating. Furthermore, topcoat layer 402 offers a rich variety of colors and glosses, enhancing the aesthetics of the entire coating system.

[0050] The special adhesive layer 403 for cold lamination 404 is a special adhesive layer coated on top of the topcoat layer 402. Its main function is to ensure that the cold lamination 404 can firmly adhere to the topcoat layer 402. This adhesive layer usually has excellent adhesion, weather resistance and chemical resistance, and can adapt to various complex construction environments and requirements.

[0051] Cold laminating film 404 is the final layer of the composite topcoat coating 40, applied over a special adhesive layer 403. Cold laminating film 404 adheres tightly to the surface of the topcoat layer 402, forming a protective film to prevent wear or scratches during processing, transportation, and use. Simultaneously, cold laminating film 404 typically exhibits good abrasion resistance, extending the coating's service life. Furthermore, cold laminating film 404 can be applied directly to the coating surface without additional heating or curing treatment, simplifying the processing and reducing production costs.

[0052] In some embodiments, the primer layer 401 is a polyurethane primer layer 401 or an epoxy polyester primer layer 401, and the thickness of the primer layer 401 is 3μm to 10μm.

[0053] The primer layer 401 is either a polyurethane primer layer 401 or an epoxy polyester primer layer 401. Both primers have good adhesion and rust prevention properties and can adapt to different construction environments and requirements. The thickness of the primer layer 401 is limited to 3μm to 10μm to ensure that it can fully perform its function without being too thick and affecting the application and performance of subsequent coatings. For example, the thickness of the primer layer 401 can be 3μm, 4μm, 5μm, 6μm, 7μm, 9μm, 10μm, etc.

[0054] In some embodiments, the topcoat layer 402 is a topcoat layer 402 rich in scratch-resistant agents, and the coefficient of friction of the topcoat layer 402 is 0.08 to 0.25, which facilitates increasing the stacking capacity during transportation while reducing coating wear.

[0055] In some embodiments, the scratch-resistant agent composition is silicon dioxide:alumina:boron nitride in a ratio of 2:1:4 to 1:1:2.

[0056] In some embodiments, the topcoat layer 402 is a pure acrylic water-based resin topcoat layer 402 or a polyurethane modified acrylic resin topcoat layer 402, and the thickness of the topcoat layer 402 is 12μm to 23μm.

[0057] The topcoat layer 402 is either a pure acrylic water-based resin topcoat layer 402 or a polyurethane-modified acrylic resin topcoat layer 402. Both types of topcoats have good weather resistance and decorative properties. The thickness of the topcoat layer 402 is limited to 12μm to 23μm to ensure that it can fully perform its protective and decorative functions without being too thick and affecting the overall performance of the coating. For example, the thickness of the topcoat layer 402 can be 12μm, 15μm, 18μm, 20μm, 21μm, 23μm, etc.

[0058] In some embodiments, the sum of the thicknesses of the primer layer 401 and the topcoat layer 402 is 15 μm to 33 μm.

[0059] In some embodiments, the thickness of the cold-coated film 404 is 3 μm to 10 μm.

[0060] The thickness of the cold-coated film 404 is 3μm to 10μm. This range ensures that the cold-coated film 404 can fully exert its protective function without being too thick, which would affect the overall performance and appearance of the coating. For example, the thickness of the cold-coated film 404 can be 3μm, 4μm, 5μm, 6μm, 7μm, 9μm, 10μm, etc.

[0061] In summary, this application has developed a color-coated sheet for photovoltaic roof drainage channels by streamlining the existing drainage channel processing flow. Compared with existing production methods, using a lightweight color-coated sheet for photovoltaic drainage channels instead of conventional drainage channels offers better corrosion resistance, surface finish, water conductivity, and edge protection. Furthermore, the coating of the color-coated sheet for photovoltaic drainage channels contains scratch-resistant particles, reducing scratches during transportation and installation and preventing coating damage. Additionally, it eliminates the need for post-installation anti-corrosion spraying, improving installation efficiency.

[0062] The present application is further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the application. Experimental methods in the following embodiments that do not specify specific conditions are generally determined according to industry standards. If there is no corresponding industry standard, then common international standards, conventional conditions, or conditions recommended by the manufacturer are followed.

[0063] Example

[0064] like Figure 2 and Figure 3 As shown, this embodiment provides a color-coated plate for a photovoltaic water channel with a 9-layer structure, including: a single-layer clear varnish layer (30) rich in hydrophobic factors, a chemical passivation layer (20), a high-aluminum zinc-aluminum-magnesium hot-dip galvanized layer (102), a cold-rolled plate (101), a high-aluminum zinc-aluminum-magnesium hot-dip galvanized layer (102), a chemical passivation layer (20), a chromium-free environmentally friendly primer layer (401), a brightly colored topcoat layer (402), a special adhesive layer for cold lamination (403), and a cold lamination film (404).

[0065] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A color coated sheet for photovoltaic water guide channel, the color coated sheet comprising: A steel base plate (10) and a composite top paint coating (40) and a back varnish coating (30) coated on opposite sides of the steel base plate (10) in a thickness direction of the steel base plate (10); The prepainted steel sheet further comprises a first pretreatment layer (20) arranged between the composite top paint coating (40) and the steel base plate (10) and / or a second pretreatment layer (20) arranged between the back varnish coating (30) and the steel base plate (10).

2. The color coated steel sheet according to claim 1, characterized by, The prepainted steel sheet comprises the first pretreatment layer (20) and the second pretreatment layer (20), and the first pretreatment layer (20) and the second pretreatment layer (20) are both chemical passivation layers, and the thickness of the chemical passivation layer is 0.7-1.5 μm.

3. The color coated steel sheet according to claim 1, wherein The thickness of the back varnish coating (30) is 4-11 μm.

4. The color coated steel sheet according to claim 1, wherein The steel base plate (10) comprises a cold-rolled plate (101) and a high-aluminum zinc-aluminum-magnesium hot-dip coating (102) coated on opposite sides of the cold-rolled plate (101) in a thickness direction of the cold-rolled plate (101).

5. The color coated steel sheet according to claim 4, wherein The high-aluminum zinc-aluminum-magnesium hot-dip coating (102) has a macro-morphology of micro-solid zinc flower texture, and the number of zinc flowers is 70-115 per 10 cm.

6. The color coated steel sheet according to claim 1, wherein The composite top paint coating (40) comprises a primer layer (401) coated on the first pretreatment layer (20), a top paint layer (402) coated on the primer layer (401), a cold-coated film (404) special adhesive layer (403) coated on the top paint layer (402), and a cold-coated film (404) coated on the cold-coated film (404) special adhesive layer (403).

7. The color coated steel sheet according to claim 6, wherein The primer layer (401) is a polyurethane primer layer or an epoxy polyester primer layer, and the thickness of the primer layer (401) is 3-10 μm.

8. The color coated steel sheet according to claim 6, wherein The top paint layer (402) is a pure acrylic water-based resin top paint layer or a polyurethane-modified acrylic resin top paint layer, and the thickness of the top paint layer (402) is 12-23 μm.

9. The color coated steel sheet according to claim 6, wherein The sum of the thicknesses of the primer layer (401) and the top paint layer (402) is 15-33 μm.

10. The color coated steel sheet according to claim 6, wherein The thickness of the cold-coated film (404) is 3-10 μm.

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