Color-coated aluminum coil with antistatic and corrosion-resistant dual functions

Abstract

The utility model belongs to the technical field of aluminum coil processing, particularly relates to a color-coated aluminum coil with dual functions of static resistance and corrosion resistance, and provides the following scheme aiming at the problem that the conventional color-coated aluminum coil is difficult to have good static resistance and corrosion resistance at the same time: the color-coated aluminum coil comprises an aluminum alloy body, a surface layer is adhered to the upper portion of the aluminum alloy body, and a pretreatment layer is adhered to the position, located at the bottom of the surface layer, of the top of the aluminum alloy body. According to the anti-static aluminum alloy coating, through the anti-static layer, the surface resistance of the coating can be effectively reduced, accumulated static electricity can be quickly conducted and removed, and harm caused by the static electricity is avoided; according to the aluminum coil, the corrosion medium is effectively prevented from making contact with the aluminum alloy matrix, the aluminum coil is prevented from being corroded, the anti-static capacity of the aluminum coil is further enhanced, and the breathable layer effectively discharges gas and moisture generated in the coating due to temperature change, the curing process and the like, so that the overall stability and durability of the coating are improved.

Description

Technical Field

[0001] This utility model relates to the field of aluminum coil processing technology, and in particular to a color-coated aluminum coil with dual functions of antistatic and corrosion resistance. Background Technology

[0002] In modern industrial production and daily life, color-coated aluminum coils are widely used in the construction, decoration and electronics industries due to their good processing performance, lightweight and high strength. Color-coated aluminum coils are composite materials made of aluminum alloy plates as the base material, which are pretreated (such as degreasing and chemical conversion treatment) and coated with one or more layers of organic coatings, and then baked and cured.

[0003] Existing color-coated aluminum coils often struggle to simultaneously achieve good antistatic and corrosion resistance properties, failing to meet the growing and diversified demands. Some coatings with antistatic properties have poor corrosion resistance, while some corrosion-resistant coatings have unsatisfactory antistatic effects. Therefore, we propose a color-coated aluminum coil with dual functions of antistatic and corrosion resistance to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing color-coated aluminum coils, which often fail to simultaneously achieve good antistatic and corrosion resistance properties, and to propose a color-coated aluminum coil with both antistatic and corrosion resistance functions.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A color-coated aluminum coil with dual functions of antistatic and corrosion resistance includes an aluminum alloy body, a surface layer bonded to the top of the aluminum alloy body, a pretreatment layer bonded to the top of the aluminum alloy body at the bottom of the surface layer, and a corrosion-resistant layer, a breathable layer, and an antistatic layer bonded sequentially between the surface layer and the pretreatment layer.

[0007] In one possible design, the top of the aluminum alloy body is roughened.

[0008] In one possible design, the surface layer is made of fluorocarbon resin with good anti-aging and corrosion resistance.

[0009] In one possible design, the corrosion-resistant layer is made of epoxy coating.

[0010] In one possible design, the breathable layer is made of polytetrafluoroethylene coating.

[0011] In one possible design, the antistatic layer is made of a polyester coating.

[0012] In one possible design, the pretreatment layer is made of a chromium-free conversion film.

[0013] In this application, firstly, the polyester coating in the antistatic layer serves as the matrix, with carbon nanotubes or conductive carbon black uniformly dispersed therein. The carbon nanotubes, due to their unique tubular structure, are interconnected within the coating to form a conductive network. The conductive carbon black particles also come into contact with or are close to each other, forming conductive pathways. When static electricity is generated on the surface of the aluminum coil, the static charge can be rapidly conducted to the ground or other grounded parts through these conductive pathways, thereby achieving the antistatic function. At the same time, the antistatic agent added to the surface layer forms a conductive adsorption film on the surface, which works synergistically with the antistatic layer to further improve the antistatic effect and reduce static electricity accumulation.

[0014] After the epoxy coating of the corrosion-resistant layer is cured on the surface of the aluminum alloy body, it forms a dense protective film. The epoxy resin molecules in the epoxy coating undergo a cross-linking reaction with the curing agent to form a three-dimensional network structure that tightly wraps the aluminum alloy surface. This protective film can effectively block external corrosive media such as acids, alkalis, and salts from contacting the aluminum alloy substrate, preventing electrochemical reactions that lead to corrosion. The fluorocarbon resin in the surface layer has high chemical stability. Its molecular structure has high carbon-fluorine bond energy, and the fluorine atoms have a strong protective effect on the carbon atoms. The high electronegativity of the fluorine atoms makes the carbon-fluorine bonds very polar. The fluorine atoms surround the carbon atoms to form a stable structure that can resist the corrosion of ultraviolet rays, acid rain, etc., further protecting the aluminum coil surface and delaying the occurrence of corrosion.

[0015] The PTFE coating of the breathable layer has a microporous structure (PTFE forms numerous tiny pores during the preparation process). During the use of color-coated aluminum coils, when gas or moisture is generated inside the coating due to temperature changes, curing reactions, etc., these gases and moisture can diffuse to the outside through the micropores of the PTFE coating (gas molecules and water molecules move from the inside of the coating to the outside under the action of concentration difference), thereby avoiding the accumulation of bubbles inside the coating, reducing the risk of coating cracking and peeling due to bubbles and stress concentration, and improving the stability and service life of the coating.

[0016] The top of the aluminum alloy body is roughened, increasing the contact area with the pretreatment layer (the uneven structure of the roughened surface allows the pretreatment layer to be better embedded within it), thereby improving the mechanical interlocking force between the two. The chromium-free conversion film of the pretreatment layer reacts chemically with the aluminum alloy body to form a chemically bonded layer (the active components in the chromium-free conversion film react with the atoms on the aluminum alloy surface to form a metal-oxide-metal structure), enhancing the adhesion to the aluminum alloy body. At the same time, the surface of the pretreatment layer also provides a good foundation for the adhesion of subsequent corrosion-resistant layers, enabling the coatings to bond tightly and form a stable composite structure.

[0017] Beneficial effects: In this utility model, the color-coated aluminum coil with dual functions of antistatic and corrosion resistance can effectively reduce the surface resistance of the coating by mixing carbon nanotubes or conductive carbon black antistatic layer, quickly dissipate the accumulated static electricity, and avoid the harm caused by static electricity.

[0018] In this utility model, the color-coated aluminum coil with dual functions of antistatic and corrosion resistance, through the corrosion-resistant layer made of epoxy coating and the surface layer with added antistatic agent, not only effectively prevents corrosive media from contacting the aluminum alloy substrate, preventing the aluminum coil from corroding and extending its service life, but also further enhances the antistatic ability of the aluminum coil.

[0019] In this utility model, the color-coated aluminum coil with dual functions of antistatic and corrosion resistance is provided with a breathable layer between the corrosion-resistant layer and the antistatic layer. This effectively removes the gas and moisture generated inside the coating due to temperature changes and the curing process, avoids the generation of bubbles and stress concentration, and improves the overall stability and durability of the coating.

[0020] In this invention, the antistatic layer effectively reduces the surface resistance of the coating, quickly dissipates accumulated static electricity, and avoids the harm caused by static electricity. The surface layer with added antistatic agent not only effectively prevents corrosive media from contacting the aluminum alloy substrate and prevents the aluminum coil from corroding, but also further enhances the antistatic ability of the aluminum coil. The breathable layer effectively discharges the gas and moisture generated inside the coating due to temperature changes, curing process, etc., improving the overall stability and durability of the coating. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of a color-coated aluminum coil with dual functions of antistatic and corrosion resistance proposed in this utility model.

[0022] Figure 2 This is a partial cross-sectional three-dimensional structural diagram of a color-coated aluminum coil with dual functions of antistatic and corrosion resistance proposed in this utility model.

[0023] Figure 3 This is a three-dimensional structural diagram of an aluminum alloy body for a color-coated aluminum coil with dual functions of antistatic and corrosion resistance, as proposed in this utility model.

[0024] In the diagram: 1. Aluminum alloy body; 2. Surface layer; 3. Corrosion resistant layer; 4. Breathable layer; 5. Antistatic layer; 6. Pretreatment layer. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0026] Example 1: Refer to Figure 1-3 An aluminum coil includes an aluminum alloy body 1. The aluminum alloy body 1 serves as the substrate and possesses sufficient strength and good machinability.

[0027] First, the top of the aluminum alloy body 1 is surface-treated to create a rough surface. This treatment step can be performed by mechanical grinding, sandblasting, or other methods to roughen the surface and ensure that the surface roughness is within a suitable range. The purpose is to enhance the adhesion between the aluminum alloy body 1 and the subsequent coating.

[0028] Next, a pretreatment layer 6 is coated on top of the aluminum alloy body 1. The pretreatment layer 6 is made of a chromium-free conversion film, which can be formed on the aluminum alloy surface by methods such as chemical treatment or physical deposition. This conversion film not only improves the corrosion resistance of the aluminum alloy, but also provides a good foundation for the adhesion of subsequent coatings.

[0029] Then, a corrosion-resistant layer 3, a breathable layer 4, and an antistatic layer 5 are sequentially coated onto the pretreatment layer 6. The corrosion-resistant layer 3 is made of epoxy coating, forming a dense anti-corrosion layer through coating and drying processes, effectively isolating corrosive media from contact with the aluminum alloy body. The breathable layer 4 is made of polytetrafluoroethylene coating, possessing good breathability and chemical stability, ensuring coating breathability while preventing the penetration of corrosive gases or liquids. The antistatic layer 5 is made of polyester coating, mixed with carbon nanotubes or conductive carbon black. The addition of these conductive fillers significantly improves the conductivity of the coating, allowing static electricity to be quickly conducted away and preventing static accumulation.

[0030] This application can be used in the field of aluminum coil processing technology, or in other fields applicable to this application.

[0031] Example 2: Reference Figure 1-2 An improvement upon Example 1 is made to a color-coated aluminum coil with dual antistatic and corrosion-resistant functions, applied to the field of aluminum coil processing technology. Finally, a surface layer 2 is coated onto the antistatic layer 5. The surface layer 2 is made of fluorocarbon resin with good anti-aging and corrosion resistance, and an antistatic agent is added to the fluorocarbon resin. The fluorocarbon resin surface layer not only provides an aesthetically pleasing appearance and long-lasting weather resistance, but also further enhances the antistatic effect through the addition of the antistatic agent.

[0032] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A color-coated aluminum coil having both antistatic and corrosion resistance functions, comprising an aluminum alloy body (1), characterized in that, A surface layer (2) is bonded to the top of the aluminum alloy body (1). A pretreatment layer (6) is bonded to the top of the aluminum alloy body (1) at the bottom of the surface layer (2). A corrosion-resistant layer (3), a breathable layer (4), and an antistatic layer (5) are bonded sequentially between the surface layer (2) and the pretreatment layer (6). The antistatic layer (5) contains carbon nanotubes or conductive carbon black.

2. The color-coated aluminum coil with dual functions of antistatic and corrosion resistance according to claim 1, characterized in that, The top of the aluminum alloy body (1) is roughened.

3. The color-coated aluminum coil with double functions of antistatic and corrosion resistance according to claim 1, characterized in that, The surface layer (2) is made of fluorocarbon resin with good anti-aging and corrosion resistance.

4. The color-coated aluminum coil with double functions of antistatic and corrosion resistance according to claim 1, characterized in that, The corrosion-resistant layer (3) is made of epoxy coating.

5. The color-coated aluminum coil with double functions of antistatic and corrosion resistance according to claim 1, characterized in that, The breathable layer (4) is made of polytetrafluoroethylene coating.

6. The color-coated aluminum coil with double functions of antistatic and corrosion resistance according to claim 1, characterized in that, The antistatic layer (5) is made of polyester coating.

7. The color-coated aluminum coil with dual functions of antistatic and corrosion resistance according to claim 1, characterized in that, The pretreatment layer (6) is made of a chromium-free conversion film.

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