Aluminum plate with double-color structure

Abstract

The embodiment of the utility model provides an aluminum plate with a double-color structure, and relates to the technical field of coating. The aluminum plate with the double-color structure comprises an aluminum substrate, the first color layer is arranged on the upper surface of the aluminum substrate; the second color layer is arranged on part of the upper surface of the first color layer, and the included angle between at least one end face of the second color layer and the top face of the second color layer is an obtuse angle; the finish paint layer is arranged on the upper surface of the second color layer and the upper surface, not provided with the second color layer, of the first color layer; and the second protective layer is arranged on the lower surface of the aluminum substrate. At least one end face of the second color layer is obliquely arranged, so that a progressive contact interface is formed between the second color layer and the first color layer, physical transition is achieved, meanwhile, the slope structure can enable the light reflection angle to continuously change, a visual boundary line is eliminated, uniform coating and smoothing are conducted through the finish paint layer, and the light reflection effect is improved. And the overall attractiveness of the aluminum plate with the double-color structure is ensured.

Description

Technical Field

[0001] This application relates to the field of coating technology, and more particularly to an aluminum plate with a two-color structure. Background Technology

[0002] Aluminum strip surface coating technology imparts excellent weather resistance, decorative properties, and functionality to aluminum materials through a multi-layer coating structure, and is widely used in architectural decoration, home appliance panels, automotive parts, and other fields. Among them, two-color or multi-color aluminum strips can enhance the aesthetics of products and also achieve functional zoning through color differentiation.

[0003] In related technologies, the main method for two-color aluminum strips is to first apply a base color coating to the substrate, and then apply a second color locally through mask spraying or printing processes.

[0004] However, due to positioning deviations and coating diffusion effects during secondary processing, the edges of the two colors of the color strips will appear jagged or irregular, resulting in an unsatisfactory transition effect at the edges of the color strips, forming obvious dividing lines and affecting the overall aesthetics. Utility Model Content

[0005] This application provides an aluminum plate with a two-color structure to solve the problem that the edges of the two colors in a two-color aluminum strip will be jagged or irregular, resulting in an unsatisfactory transition effect at the edges of the strips, forming obvious dividing lines, and affecting the overall aesthetics.

[0006] This application provides an aluminum plate with a two-color structure, comprising:

[0007] Aluminum base;

[0008] The first color layer is disposed on the upper surface of the aluminum substrate;

[0009] A second color layer is disposed on a portion of the upper surface of the first color layer, wherein the angle between at least one end face of the second color layer and the top surface of the second color layer is an obtuse angle.

[0010] A topcoat layer is disposed on the upper surface of the second color layer and on the upper surface of the first color layer where the second color layer is not disposed.

[0011] In one possible implementation, the thickness of the first color layer is 10~15μm.

[0012] In one possible implementation, the thickness of the second color layer is 10~15μm, and the angle between the end face and the top face is 140~165°.

[0013] In one possible implementation, the thickness of the topcoat layer is 10~15μm.

[0014] In one possible implementation, a first protective layer is further included, which is disposed between the aluminum substrate and the first color layer. The first protective layer includes a primer layer and a first chemical conversion layer. The first chemical conversion layer is disposed on the upper surface of the aluminum substrate, and the primer layer is disposed on the upper surface of the first chemical conversion layer.

[0015] In one possible implementation, the thickness of the primer layer is 8~12μm.

[0016] In one possible implementation, the thickness of the first chemical conversion layer is 0.2~1 μm.

[0017] In one possible implementation, a second protective layer is further included, which includes a back coating layer and a second chemical conversion layer. The second chemical conversion layer is disposed on the lower surface of the aluminum substrate, and the back coating layer is disposed on the lower surface of the second chemical conversion layer.

[0018] In one possible implementation, the thickness of the back coating layer is 8~10μm.

[0019] In one possible implementation, the thickness of the second chemical conversion layer is 0.2~1 μm.

[0020] The aluminum plate with a two-color structure provided in this application includes an aluminum substrate; a first color layer disposed on the upper surface of the aluminum substrate; a second color layer disposed on a portion of the upper surface of the first color layer, wherein at least one end face of the second color layer and the top surface of the second color layer form an obtuse angle; and a topcoat layer disposed on the upper surface of the second color layer and the upper surface of the first color layer where the second color layer is not disposed. By tilting at least one end face of the second color layer, a gradual contact interface is formed between the second color layer and the first color layer. This achieves a physical transition while the tilted structure allows for continuous changes in the light reflection angle, thereby eliminating the visual boundary line. The topcoat layer provides uniform coverage and smoothing, ensuring the overall aesthetics of the aluminum plate with a two-color structure. Attached Figure Description

[0021] 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.

[0022] Figure 1 This is a schematic diagram of the structure of the two-color aluminum strip provided in an embodiment of this application.

[0023] Explanation of reference numerals in the attached figures:

[0024] 100-aluminum matrix;

[0025] 200 - First color layer;

[0026] 300 - Second color layer;

[0027] 400 - Topcoat layer;

[0028] 500 - First protective layer; 510 - Primer layer; 520 - First chemical conversion layer;

[0029] 600 - Second protective layer; 610 - Backing paint layer; 620 - Second chemical conversion layer.

[0030] The accompanying drawings have illustrated specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to specific embodiments. Detailed Implementation

[0031] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of the embodiments of this application.

[0032] In the embodiments of this application, the terms "upper," "lower," "inner," "middle," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are mainly for better describing the embodiments of this application and their implementations, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation. Furthermore, some of the above terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may also be used in some cases to indicate a certain dependency or connection relationship. For those skilled in the art, the specific meaning of these terms in the embodiments of this application can be understood according to the specific circumstances.

[0033] Furthermore, the terms "set up," "connect," and "fix" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0034] The terms "first," "second," "third," "fourth," etc. (if present) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the present application described herein can be implemented, for example, in orders other than those illustrated or described herein.

[0035] In this application, the terms "exemplarily" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplarily" or "for example" in this application should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "exemplarily" or "for example" is intended to present the relevant concepts in a specific manner.

[0036] First, let's explain the terms used in this application:

[0037] PE coating: Polyethylene Coating;

[0038] FEVE coating: Fluorocarbon Resin Coating.

[0039] Unless otherwise stated, the term "multiple" means two or more.

[0040] As described in the background section, aluminum strip surface coating technology imparts excellent weather resistance, decorative properties, and functionality to aluminum materials through a multi-layer coating structure, and is widely used in architectural decoration, home appliance panels, automotive parts, and other fields. Among these applications, two-color or multi-color aluminum strips can enhance product aesthetics and also achieve functional zoning through color differentiation.

[0041] In related technologies, the main method for two-color aluminum strips is to first apply a base color coating to the substrate, and then apply a second color locally through mask spraying or printing processes.

[0042] However, due to positioning deviations and coating diffusion effects during secondary processing, the edges of the two colors of the color strips will appear jagged or irregular, resulting in an unsatisfactory transition effect at the edges of the color strips, forming obvious dividing lines and affecting the overall aesthetics.

[0043] The aluminum plate with a two-color structure provided in this application includes an aluminum substrate; a first color layer disposed on the upper surface of the aluminum substrate; a second color layer disposed on a portion of the upper surface of the first color layer, wherein the angle between at least one end face of the second color layer and the top surface of the second color layer is an obtuse angle; and a topcoat layer disposed on the upper surface of the second color layer and the upper surface of the first color layer where the second color layer is not disposed. By tilting at least one end face of the second color layer, a gradual contact interface is formed between the second color layer and the first color layer. This achieves a physical transition while the tilted structure allows for a continuous change in the angle of light reflection, thereby eliminating the visual boundary line. The topcoat layer provides a uniform coating and smoothing, ensuring the overall aesthetics of the aluminum plate with a two-color structure.

[0044] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will be described below with reference to the accompanying drawings.

[0045] Figure 1 This is a schematic diagram of the structure of the two-color aluminum strip provided in an embodiment of this application.

[0046] Please refer to Figure 1 This embodiment provides an aluminum plate with a two-color structure, including an aluminum substrate 100; a first color layer 200 disposed on the upper surface of the aluminum substrate 100; a second color layer 300 disposed on a portion of the upper surface of the first color layer 200, wherein at least one end face of the second color layer 300 and the top surface of the second color layer 300 form an obtuse angle; a topcoat layer 400 disposed on the upper surface of the second color layer 300 and the upper surface of the first color layer 200 where the second color layer 300 is not disposed; and a second protective layer 600 disposed on the lower surface of the aluminum substrate 100.

[0047] Specifically, in this embodiment, the aluminum substrate 100 is an aluminum plate substrate made of aluminum alloy material, so as to provide a stable support base for subsequent coating.

[0048] The first color layer 200 is uniformly applied to the upper surface of the aluminum substrate 100, serving as the base color layer for the entire aluminum plate with a dual-color structure. It is applied using a full-coating process to ensure uniform color and to provide a background for the subsequent overlay of the second color layer 300.

[0049] The second color layer 300 is disposed on a portion of the upper surface of the first color layer 200, and the placement of the second color layer 300 can be adaptively selected according to actual needs. The angle between at least one end face of the second color layer 300 and its top surface is an obtuse angle, meaning at least one end face of the second color layer 300 is inclined in a direction away from the other end face. This avoids the jagged edges found in existing aluminum plates with a two-color structure, resulting in a smoother and more natural transition between the two colors of the first color layer 200 and the second color layer 300.

[0050] In addition, the angles between the two end faces of the second color layer 300 and the top face of the second color layer 300 can both be obtuse angles, so that both ends of the second color layer 300 can present a smooth transition effect, making the transition between the two colors of the first color layer 200 and the second color layer 300 softer and more natural.

[0051] In this embodiment, both the first color layer 200 and the second color layer 300 are coated with PE, where PE coating refers to a coating system with polyethylene resin as the main film-forming substance. By using a PE coating, the first color layer 200 and the second color layer 300 possess good flexibility and ductility, making them less prone to cracking during bending or forming of the aluminum substrate 100. Simultaneously, the PE coating exhibits excellent chemical corrosion resistance, effectively resisting the erosion of environmental factors such as acid rain and salt spray.

[0052] In addition, the first color layer 200, as the base color layer, uses a PE coating to ensure the consistency of the base color. The second color layer 300 uses the same PE coating material as the first color layer 200, thereby ensuring the compatibility of the interface between the first color layer 200 and the second color layer 300 and avoiding the problem of interlayer peeling caused by different coating systems.

[0053] In other embodiments, the materials of the first color layer 200 and the second color layer 300 can be selected adaptively according to actual needs, and this embodiment does not impose any restrictions on this.

[0054] In this embodiment, the topcoat layer 400 covers both the second color layer 300 and the exposed first color layer 200 to protect the first color layer 200 and the second color layer 300 from external environmental erosion, while also weakening the visual difference between the edges of the first color layer 200 and the second color layer 300, further improving the overall aesthetics of the aluminum plate with the two-color structure.

[0055] In this embodiment, the topcoat layer 400 is a PE coating or a FEVE coating.

[0056] Specifically, in this embodiment, when the aluminum plate with the two-color structure needs to be used in an indoor environment, the topcoat layer 400 is a PE coating. The PE coating can effectively wrap the first color layer 200 and the second color layer 300, weakening the visual difference between the edges of the first color layer 200 and the second color layer 300.

[0057] When aluminum panels with a two-tone structure are intended for outdoor use, the topcoat layer 400 is a FEVE coating. FEVE coatings offer superior protection because their molecular structure contains numerous fluorocarbon bonds with bond energies far exceeding those of ordinary carbon-carbon bonds, resulting in better weather resistance. Furthermore, FEVE coatings possess excellent self-cleaning properties; their low surface energy makes it difficult for contaminants to adhere, and rainwater can easily clean the surface.

[0058] Carbon-carbon bonds are covalent bonds formed between carbon atoms in chemistry. Generally, the bond energy of a carbon-carbon bond is approximately 348 kJ / mol, meaning that breaking one mole of carbon-carbon bonds requires absorbing about 348 kilojoules of energy. In contrast, the fluorocarbon bonds in FEVE coatings have a higher bond energy, approximately 485 kJ / mol. This makes the fluorocarbon bonds more stable and less susceptible to damage from external factors (such as ultraviolet radiation and high temperatures), thus enhancing the weather resistance of the FEVE coating.

[0059] In other embodiments, the specific material of the topcoat layer 400 can be selected adaptively according to actual needs, and this embodiment does not impose any restrictions on this.

[0060] By using the aluminum plate with a two-color structure provided in this embodiment, at least one end face of the second color layer 300 is tilted to form a progressive contact interface between the second color layer 300 and the first color layer 200. This achieves a physical transition while the tilted structure allows the light reflection angle to change continuously, thereby eliminating the visual dividing line. The topcoat layer 400 provides a uniform coating and smoothing, ensuring the overall aesthetics of the aluminum plate with the two-color structure.

[0061] In an optional embodiment, the thickness of the first color layer 200 is 10~15μm.

[0062] Specifically, in this embodiment, the thickness of the first color layer 200 is between 10 and 15 μm, so as to cover the aluminum substrate 100, avoid the problem of transparent background and color spots, and ensure the uniformity and consistency of the background color.

[0063] Specifically, when the thickness of the first color layer 200 is less than 10 μm, the first color layer 200 is prone to cracking. When the thickness of the first color layer 200 exceeds 15 μm, although the bending resistance of the first color layer 200 is improved, it will affect the adhesion between the first color layer 200 and the aluminum substrate 100, thus affecting the overall aesthetics.

[0064] In an optional embodiment, the thickness of the second color layer 300 is 10~15μm, and the angle between the end face and the top face is 140~165°.

[0065] Specifically, in this embodiment, the thickness of the second color layer 300 is 10~15μm, thereby ensuring that the second color layer 300 can cover the color of the first color layer 200 while maintaining the overall flexibility of the second color layer 300, and preventing the aluminum plate with the two-color structure from cracking during subsequent processing.

[0066] When the thickness of the second color layer 300 is less than 10μm, its insufficient hiding power will cause the color of the first color layer 200 to show through, thus affecting the aesthetics. At the same time, if the thickness of the second color layer 300 is too thin, cracks are likely to occur during subsequent bending or stamping processes, and it will be impossible to form an effective edge transition with the first color layer 200.

[0067] When the thickness of the second color layer 300 exceeds 15μm, the increased thickness of the second color layer 300 makes the coating prone to sagging during curing, thus affecting the accuracy of the edge contour of the second color layer 300. At the same time, the excessively thick second coating has higher internal stress, which can easily cause the aluminum plate with the two-color structure to warp and deform when the temperature changes.

[0068] Meanwhile, in this embodiment, the angle between the end face and the top face of the second color layer 300 is 140~165°, that is, the angle between the end face and the first color layer 200 is between 15° and 40°, so as to ensure that a natural and smooth transition is formed between the second color layer 300 and the first color layer 200, and to weaken the visual effect of the edge.

[0069] When the angle between the end face and the top face is less than 140°, the transition zone is too steep, which makes it impossible to completely eliminate the boundary between the first color layer 200 and the second color layer 300. Under certain lighting conditions, obvious edge shadows will appear, resulting in an unsatisfactory visual effect.

[0070] When the angle between the end face and the top face is greater than 165°, the edge of the second color layer 300 spreads excessively, which can easily lead to an unclear outline of the second color layer 300, while also consuming extra paint and increasing production costs. In addition, an excessively large transition area can make it impossible to accurately control the width of the second color layer 300, thus affecting the design accuracy.

[0071] In an optional embodiment, the thickness of the topcoat layer 400 is 10~15μm.

[0072] Specifically, in this embodiment, the thickness of the topcoat layer 400 is between 10 and 15 μm to ensure that the topcoat layer 400 provides good surface smoothness, encapsulates the first color layer 200 and the second color layer 300, and eliminates minor height differences. Furthermore, the topcoat layer 400 within this thickness range has good optical properties, enabling it to display the true colors of the first color layer 200 and the second color layer 300 while maintaining sufficient transparency, thus ensuring uniform gloss.

[0073] When the thickness of the topcoat layer 400 is less than 10μm, the coating of the topcoat layer 400 is too thin, resulting in insufficient hiding power and inability to effectively resist the erosion of the external environment. At the same time, an excessively thin topcoat layer 400 is prone to light and dark differences at certain angles, thus affecting the aesthetics.

[0074] When the thickness of the topcoat layer 400 exceeds 15μm, the increased thickness leads to higher costs and longer curing time, impacting production efficiency. Furthermore, an excessively thick topcoat layer 400 has lower flexibility, making it prone to cracking during bending processes.

[0075] In an optional embodiment, a first protective layer 500 is further included, which is disposed between the aluminum substrate 100 and the first color layer 200. The first protective layer 500 includes a primer layer 510 and a first chemical conversion layer 520. The first chemical conversion layer 520 is disposed on the upper surface of the aluminum substrate 100, and the primer layer 510 is disposed on the upper surface of the first chemical conversion layer 520.

[0076] Specifically, the first protective layer 500 is tightly disposed on the upper surface of the aluminum substrate 100, providing basic protection to the aluminum substrate 100 and preventing external corrosive media from eroding it. At the same time, the first protective layer 500 also improves the adhesion between the first protective layer 500 and the first color layer 200, ensuring the stability of the entire coating structure.

[0077] In this embodiment, the first protective layer 500 includes a primer layer 510 and a first chemical conversion layer 520, so as to protect the upper surface of the aluminum substrate 100 through the synergistic effect of the first chemical conversion layer 520 and the primer layer 510.

[0078] In this embodiment, the first chemical conversion layer 520 is a silane passivation layer. Through the chemical bonding of silane molecules, a dense protective film is formed on the upper surface of the aluminum substrate 100, reducing direct contact between the aluminum substrate 100 and the external environment, improving the corrosion resistance of the aluminum substrate 100, and providing an adhesion substrate for the primer layer 510. Furthermore, the molecular structure of the silane passivation layer gives it good permeability, allowing it to penetrate deep into the micropores on the upper surface of the aluminum substrate 100 and form strong chemical bonds, ensuring the stability of the connection between the first chemical conversion layer 520 and the aluminum substrate 100.

[0079] In other embodiments, the material of the first chemical conversion layer 520 may be selected adaptively according to actual needs, and this embodiment does not impose any restrictions on this.

[0080] In this embodiment, the primer layer 510 is disposed on the first chemical conversion layer 520. The presence of the primer layer 510 improves the adhesion of the overall coating, thereby enhancing the stability of the bond between the first color layer 200 and the primer layer 510. Simultaneously, the primer layer 510 also blocks corrosive agents that may penetrate the first chemical conversion layer 520, further improving the protective performance.

[0081] In an optional embodiment, the thickness of the primer layer 510 is 8~12 μm.

[0082] Specifically, in this embodiment, when the thickness of the primer layer 510 is between 8 and 12 μm, a continuous protective film can be formed, effectively blocking the penetration of corrosive media in the external environment. Simultaneously, it can improve surface smoothness, providing a good substrate for the subsequent application of the first color layer 200.

[0083] When the thickness of the primer layer 510 is less than 8μm, the coverage of the primer layer 510 may be incomplete, resulting in local weak points in protection. This makes it insufficient to fill the small defects on the surface of the first chemical conversion layer 520, thus affecting the smoothness of the surface.

[0084] When the thickness of the primer layer 510 exceeds 12μm, the material consumption of the primer layer 510 increases, and a longer curing time is required, thereby increasing production costs and reducing production efficiency. At the same time, the internal stress of the primer layer 510 increases, making it prone to deformation, and its low flexibility makes it susceptible to cracking during subsequent processing.

[0085] In an optional embodiment, the thickness of the first chemical conversion layer 520 is 0.2~1 μm.

[0086] Specifically, in this embodiment, the thickness of the first chemical conversion layer 520 is between 0.2 and 1 μm, thereby forming a dense monomolecular protective film on the upper surface of the aluminum substrate 100, penetrating deep into the micropores on the upper surface of the aluminum substrate 100, achieving atomic-level bonding protection, effectively blocking the penetration of corrosive media, and without affecting the mechanical properties of the aluminum substrate 100.

[0087] When the thickness of the first chemical conversion layer 520 is less than 0.2 μm, the film continuity of the first chemical conversion layer 520 may be insufficient, and a complete protective layer cannot be formed. At the same time, the coverage of the aluminum substrate 100 surface decreases, which can easily lead to localized corrosion problems.

[0088] When the thickness of the first chemical conversion layer 520 is greater than 1 μm, it may cause an increase in the internal stress of the first chemical conversion layer 520, resulting in cracking problems, and at the same time affect the bonding between the aluminum substrate 100 and the primer layer 510.

[0089] In an optional embodiment, a second protective layer 600 is further included, which includes a back coating layer 610 and a second chemical conversion layer 620. The second chemical conversion layer 620 is disposed on the lower surface of the aluminum substrate 100, and the back coating layer 610 is disposed on the lower surface of the second chemical conversion layer 620.

[0090] Specifically, in this embodiment, a second protective layer 600 is further provided on the lower surface of the aluminum substrate 100. The second protective layer 600 can form symmetrical protection with the first protective layer 500 to block external environmental media such as rainwater and corrosive gases from corroding the back side of the aluminum substrate 100. At the same time, the second protective layer 600 can also balance stress. By controlling the thickness and thermal expansion coefficient of the second protective layer 600, the internal stress generated by multiple coatings on the upper surface of the aluminum substrate 100 can be offset, preventing the aluminum strip structure from warping and deforming when the temperature changes.

[0091] Specifically, in this embodiment, the second protective layer 600 includes a back coating layer 610 and a second chemical conversion layer 620, so as to protect the lower surface of the aluminum substrate 100 through the synergistic effect of the second chemical conversion layer 620 and the back coating layer 610.

[0092] In this embodiment, the second chemical conversion layer 620 is a silane passivation layer. Through the chemical bonding of silane molecules, a dense protective film is formed on the upper surface of the aluminum substrate 100, reducing direct contact between the aluminum substrate 100 and the external environment, thus improving the corrosion resistance of the aluminum substrate 100 and providing an adhesion substrate for the primer layer 510. Furthermore, the molecular structure of the silane passivation layer gives it excellent permeability, allowing it to penetrate deep into the micropores on the upper surface of the aluminum substrate 100 and form strong chemical bonds, ensuring the stability of the connection between the second chemical conversion layer 620 and the aluminum substrate 100.

[0093] In other embodiments, the material of the second chemical conversion layer 620 may be selected adaptively according to actual needs, and this embodiment does not impose any restrictions on this.

[0094] The back paint layer 610 is disposed on the lower surface of the second chemical conversion layer 620. The back paint layer 610 can block the penetration of corrosive factors such as moisture and oxygen in the environment, and at the same time balance the stress distribution on the upper and lower surfaces of the aluminum substrate 100, preventing warping and deformation caused by single-sided coating.

[0095] Furthermore, in this embodiment, the back coating layer 610 is a PE coating, which gives the back coating layer 610 good flexibility and ductility, making it less prone to cracking during the bending or forming process of the aluminum substrate 100. At the same time, the PE coating has excellent chemical corrosion resistance, effectively resisting the erosion of environmental factors such as acid rain and salt spray.

[0096] In an optional embodiment, the thickness of the back coating layer 610 is 8~10 μm.

[0097] Specifically, in this embodiment, the thickness of the back coating layer 610 is between 8 and 10 μm, thereby forming a continuous and dense protective film that effectively blocks the external environment from corroding the aluminum substrate 100, while maintaining excellent flexibility to ensure that no cracks occur during processing and installation.

[0098] When the thickness of the back coating layer 610 is less than 8μm, incomplete coverage is likely to occur, resulting in localized weak points. Furthermore, if the thickness of the back coating layer 610 is low, its protective performance is poor and it cannot withstand long-term environmental erosion.

[0099] When the thickness of the back coating layer 610 exceeds 10μm, it will increase material costs and prolong curing time, thereby reducing production efficiency. At the same time, an excessively thick back coating layer 610 has low flexibility and can easily affect the bending performance of the entire aluminum plate with a two-color structure.

[0100] In an optional embodiment, the thickness of the second chemical conversion layer 620 is 0.2~1 μm.

[0101] Specifically, in this embodiment, the thickness of the second chemical conversion layer 620 is between 0.2 and 1 μm, thereby forming a dense monomolecular protective film on the upper surface of the aluminum substrate 100, penetrating deep into the micropores on the surface of the aluminum substrate 100, achieving atomic-level bonding protection, effectively blocking the penetration of corrosive media, and without affecting the mechanical properties of the aluminum substrate 100.

[0102] When the thickness of the second chemical conversion layer 620 is less than 0.2 μm, the film continuity of the second chemical conversion layer 620 may be insufficient, and a complete protective layer cannot be formed. At the same time, the coverage of the lower surface of the aluminum substrate 100 decreases, which can easily lead to localized corrosion problems.

[0103] When the thickness of the second chemical conversion layer 620 is greater than 1 μm, it may cause an increase in the internal stress of the second chemical conversion layer 620, resulting in cracking problems, and at the same time affect the bonding between the aluminum substrate 100 and the back coating layer 610.

[0104] Finally, it should be noted that other embodiments of this utility model will readily occur to those skilled in the art upon consideration of the specification and practice of the utility model disclosed herein. This utility model is intended to cover any variations, uses, or adaptations of this utility model that follow the general principles of this utility model and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this utility model is limited only by the appended claims.

Claims

1. An aluminum plate with a two-color structure, characterized in that, include: Aluminum base; The first color layer is disposed on the upper surface of the aluminum substrate; A second color layer is disposed on a portion of the upper surface of the first color layer, wherein the angle between at least one end face of the second color layer and the top surface of the second color layer is an obtuse angle. A topcoat layer is disposed on the upper surface of the second color layer and on the upper surface of the first color layer where the second color layer is not disposed.

2. The aluminum plate with a two-color structure according to claim 1, characterized in that, The thickness of the first color layer is 10~15μm.

3. The aluminum plate with a two-color structure according to claim 1, characterized in that, The thickness of the second color layer is 10~15μm, and the angle between the end face and the top face is 140~165°.

4. The aluminum plate with a two-color structure according to claim 1, characterized in that, The thickness of the topcoat layer is 10~15μm.

5. The aluminum plate with a two-color structure according to any one of claims 1-4, characterized in that, It also includes a first protective layer, which is disposed between the aluminum substrate and the first color layer. The first protective layer includes a primer layer and a first chemical conversion layer. The first chemical conversion layer is disposed on the upper surface of the aluminum substrate, and the primer layer is disposed on the upper surface of the first chemical conversion layer.

6. The aluminum plate with a two-color structure according to claim 5, characterized in that, The thickness of the primer layer is 8~12μm.

7. The aluminum plate with a two-color structure according to claim 5, characterized in that, The thickness of the first chemical conversion layer is 0.2~1μm.

8. The aluminum plate with a two-color structure according to any one of claims 1-4, characterized in that, It also includes a second protective layer, which includes a back coating layer and a second chemical conversion layer. The second chemical conversion layer is disposed on the lower surface of the aluminum substrate, and the back coating layer is disposed on the lower surface of the second chemical conversion layer.

9. The aluminum plate with a two-color structure according to claim 8, characterized in that, The thickness of the back coating layer is 8~10μm.

10. The aluminum plate with a two-color structure according to claim 8, characterized in that, The thickness of the second chemical conversion layer is 0.2~1μm.

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