Corrosion-resistant color-coated aluminum coil

Abstract

The utility model discloses a corrosion-resistant color-coated aluminum coil, and relates to the technical field of color-coated aluminum coils. A through groove is formed in the top end of the base layer, the bottom end of the base layer is coated with a back paint layer, the top end of the base layer is sequentially coated with a chemical treatment layer, a primer layer and a finish paint layer, and the through groove is filled with a connecting body with the same characteristics as the chemical treatment layer. The top end of the base layer is provided with the through groove, and the through groove is filled with the connecting body with the same characteristics as the chemical treatment layer, so that the thickness of the corresponding position of the chemical treatment layer is increased, the overall thickness of the color-coated aluminum coil is not increased, and the thickness of the corresponding position of the chemical treatment layer is not increased; therefore, the coating thickness of the primer layer and the finish paint layer is reduced, and the problems that the overall strength is greatly reduced and the abrasion resistance and the impact resistance are poor due to the fact that the overall thickness of the aluminum coil is reduced are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of color-coated aluminum coils, in particular to a corrosion-resistant color-coated aluminum coil. Background Art

[0002] Plastic panels are made of multiple layers of materials. The upper and lower layers are high-purity aluminum alloy plates, and the middle layer is a non-toxic low-density polyethylene core plate. A protective film is also pasted on the front. For outdoor use, the front of the aluminum-plastic panel is coated with a fluorocarbon resin coating. Generally speaking, when aluminum-plastic panels are produced, color-coated aluminum coils with certain colors and functions need to be made first, and then the color-coated aluminum coils are compounded onto the core plate to form an aluminum-plastic panel;

[0003] As an outdoor aluminum-plastic panel, the fluorocarbon resin coating on its surface is applied when the color-coated aluminum coil is manufactured. In the conventional production of color-coated aluminum coils, the aluminum coils are discharged, cleaned, chemically formed, and then surface coated, cured, and rolled to form color-coated aluminum coils that meet the requirements. As color-coated aluminum coils for outdoor aluminum-plastic panels, fluorocarbon resin coatings are often used as coating coatings. The coatings have many comprehensive properties suitable for outdoor use conditions, such as good weather resistance and heat resistance, so they are widely used. However, in actual use, it is also found that due to the high hardness of fluorocarbon resin coatings after curing, when the aluminum coils are rolled, it is easy to cause problems such as peeling and cracking of the coating; and with the expansion of the application environment of aluminum-plastic panels, more and more functions are required, especially for many aluminum-plastic panels used in outdoor decoration, the demand for corrosion resistance is also increased, so it is necessary to use corrosion-resistant coatings to make new color-coated aluminum coils.

[0004] In the industrial field, corrosion-resistant coatings are generally applied to the surface of metal components used outdoors for surface treatment. Commonly used corrosion-resistant surface coatings include zinc-rich coatings, which slow down the corrosion of the substrate through sacrificial corrosion of metallic zinc. Conventionally used zinc-rich coatings have a zinc powder content of more than 85% and a single-layer coating thickness of more than 100 microns. To achieve effective corrosion protection, the coating must be more than 2 layers, so that after the metallic zinc on the surface is sacrificed, the zinc in the middle layer and the bottom layer can still play a role and play an effective anti-corrosion role. However, zinc-rich coatings are generally only suitable for anti-corrosion treatment of steel structures. On the one hand, these steel structures will be used outdoors for decades or even hundreds of years, and they need to be regularly re-coated with zinc-rich coatings for anti-corrosion protection; on the other hand, the coating thickness on steel structures will not affect their structural strength.

[0005] However, in the production of color-coated aluminum coils for aluminum-plastic panels, since the aluminum coils themselves are relatively thin, generally about 1-2 mm, if 2-3 layers of coating, each layer of 100 microns, are applied, it will seriously affect the winding of the color-coated aluminum coils. Therefore, for color-coated aluminum coils for outdoor aluminum-plastic panels, combined with the characteristics of existing zinc-rich coatings, it is necessary to improve the production process and develop a coating that is more in line with the use characteristics of color-coated aluminum coils, in order to meet the use needs of outdoor corrosion-resistant aluminum-plastic panels:

[0006] The existing Chinese patent publication number CN209352808U is a kind of corrosion-resistant color-coated aluminum coil: "The substrate is an aluminum skin, and both sides of the aluminum skin are chemical films; a primer, a middle coating, and a top coating are arranged in sequence outside the chemical film on one side of the aluminum skin, and the primer is provided with a number of holes that penetrate the coating, and the holes are penetration bodies consistent with the middle coating; the chemical film is an oxide film layer; the primer is a two-component epoxy primer film layer; the middle coating is a first zinc-containing polyester paint film layer; the top coating is a second zinc-containing polyester paint film layer. After multiple coatings on the surface of the base aluminum skin, a high-quality coating is formed, which improves the weather resistance of the color-coated aluminum coil, and metallic zinc is added to the middle coating and the top coating to form an electrochemically conductive anode protection with the base aluminum skin, so that the final product, the corrosion-resistant color-coated aluminum coil, has good corrosion resistance";

[0007] Although the purpose of reducing the overall thickness of the aluminum coil is achieved by opening holes and setting penetrating bodies consistent with the middle coating in the holes, its overall strength is greatly reduced, and its wear resistance and impact resistance are poor.

[0008] Therefore, the existing corrosion-resistant color-coated aluminum coils cannot meet the needs of actual use, so the market is in urgent need of improved technologies to solve the above problems. Utility Model Content

[0009] The utility model aims to provide a corrosion-resistant color-coated aluminum coil, which, by opening a through groove at the top of a base layer and filling a connector with the same properties as a chemical treatment layer in the through groove, increases the thickness of the corresponding position of the chemical treatment layer without increasing the overall thickness of the color-coated aluminum coil, and does not lead to an increase in the thickness of the corresponding position of the chemical treatment layer, thereby reducing the coating thickness of the primer layer and the topcoat layer, and solves the problem that although the overall thickness of the aluminum coil is reduced by opening a hole and arranging a penetrating body consistent with the middle coating in the hole, the overall strength is greatly reduced, and the wear resistance and impact resistance are poor.

[0010] In order to solve the above technical problems, the utility model is realized by the following technical solutions:

[0011] The utility model discloses a corrosion-resistant color-coated aluminum coil, comprising a base with a through groove at the top, the bottom of the base is coated with a back paint layer, the top of the base is coated with a chemical treatment layer, a primer layer and a top paint layer in sequence, the through groove is filled with a connector with the same properties as the chemical treatment layer, and the connector with the same properties as the chemical treatment layer filled in the through groove increases the thickness of the corresponding position of the chemical treatment layer without increasing the overall thickness of the color-coated aluminum coil, and does not increase the thickness of the corresponding position of the chemical treatment layer, thereby reducing the coating thickness of the primer layer and the top paint layer.

[0012] Furthermore, the base layer is made of high-quality aluminum material, and a coating protective film is movably sleeved on the outside of the base layer, and the coating protective film is used to protect the topcoat layer from being scratched or damaged during transportation and installation.

[0013] Furthermore, the thickness of the chemical treatment layer is 20-25 microns. The main purpose of the chemical treatment coating is to improve the adhesion of the coating and provide a good foundation for painting.

[0014] Furthermore, the thickness of the primer layer is 30-35 microns. The primer layer is located between the chemical treatment layer and the topcoat layer. Its main function is to enhance the adhesion of the topcoat, provide additional anti-corrosion protection, and improve the overall performance of the coating.

[0015] Furthermore, the thickness of the topcoat layer is 40-45 microns. The topcoat layer is the appearance layer of the color-coated aluminum coil, providing the required color and gloss, as well as weather resistance and corrosion resistance.

[0016] The utility model has the following beneficial effects:

[0017] The utility model opens a through groove at the top of the base layer and fills the through groove with a connector with the same properties as the chemical treatment layer. While increasing the thickness of the corresponding position of the chemical treatment layer, the overall thickness of the color-coated aluminum coil will not be increased, and the thickness of the corresponding position of the chemical treatment layer will not be increased, thereby reducing the coating thickness of the primer layer and the topcoat layer, and preventing the problem of a significant reduction in the overall strength of the aluminum coil due to a reduction in the overall thickness, and poor wear resistance and impact resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the base layer of the utility model.

[0019] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0020] 101. base layer; 102. through groove; 103. back paint layer. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0022] See also Figure 1 As shown, the utility model is a corrosion-resistant color-coated aluminum coil, comprising a base layer 101 with a through groove 102 at the top, a back paint layer 103 coated on the bottom of the base layer 101, a chemical treatment layer, a primer layer and a top paint layer coated in sequence on the top of the base layer 101, and a connector with the same properties as the chemical treatment layer is filled in the through groove 102. The connector with the same properties as the chemical treatment layer filled in the through groove 102 can increase the thickness of the corresponding position of the chemical treatment layer without increasing the overall thickness of the color-coated aluminum coil, and will not increase the thickness of the corresponding position of the chemical treatment layer, thereby reducing the coating thickness of the primer layer and the top paint layer.

[0023] Among them Figure 1 As shown, the base layer 101 is high-quality aluminum material, and the outer movable sleeve of the base layer 101 is provided with a coating protective film, which is used to protect the topcoat layer from being scratched or damaged during transportation and installation. The thickness of the chemical treatment layer is 20-25 microns. The main purpose of the chemical treatment coating is to improve the adhesion of the coating and provide a good foundation for painting. The thickness of the primer layer is 30-35 microns. The primer layer is located between the chemical treatment layer and the topcoat layer. Its main function is to enhance the adhesion of the topcoat, provide additional anti-corrosion protection, and improve the overall performance of the coating. The thickness of the topcoat layer is 40-45 microns. The topcoat layer is the appearance layer of the color-coated aluminum coil, providing the required color and gloss, while providing weather resistance and corrosion resistance.

[0024] The above are only preferred embodiments of the present invention and do not limit the present invention. Any modification to the technical solutions recorded in the aforementioned embodiments and any equivalent replacement of some of the technical features therein, any modification, equivalent replacement, and improvement made are all within the protection scope of the present invention.

Claims

1. A corrosion-resistant color-coated aluminum coil, characterized by: The invention comprises a base layer (101) with a through groove (102) at the top, the bottom of the base layer (101) is coated with a back paint layer (103), the top of the base layer (101) is coated with a chemical treatment layer, a primer layer and a top paint layer in sequence, and the through groove (102) is filled with a connector having the same properties as the chemical treatment layer.

2. The corrosion-resistant color-coated aluminum coil according to claim 1, characterized in that: The base layer (101) is made of high-quality aluminum material, and the base layer (101) is movably sleeved with a coating protective film on its exterior.

3. The corrosion-resistant color-coated aluminum coil according to claim 1, characterized in that: The thickness of the chemical treatment layer is 20-25 microns.

4. The corrosion-resistant color-coated aluminum coil according to claim 1, characterized in that: The thickness of the primer layer is 30-35 microns.

5. The corrosion-resistant color-coated aluminum coil according to claim 1, characterized in that: The thickness of the topcoat layer is 40-45 microns.

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