Method for enhancing paint spraying adhesive force of metal material of aircraft composite packaging box

Abstract

The invention discloses a method for enhancing paint spraying adhesive force of a metal material of an aircraft composite material packaging box, and belongs to the field of composite material packaging boxes. The method comprises the steps that the metal surface of the aircraft composite packaging box is pretreated; a metal adhesion promoter is diluted, then the pretreated metal surface is coated with the metal adhesion promoter, a protective film is formed on the metal surface, and then baking and curing are conducted; and after baking and curing are completed, paint spraying operation is conducted, primer is sprayed firstly, and then finish paint is sprayed. The paint spraying adhesive force of the metal material of the aircraft composite material packaging box can be effectively improved.

Description

Technical Field

[0001] The invention belongs to the field of composite material packaging boxes, and in particular relates to a method for enhancing the adhesion of metal material spray paint of an aircraft composite material packaging box. Background Art

[0002] Methods for improving the adhesion of metal paint include phosphating, electrochemical treatment, sandblasting, etc. Phosphating and electrochemical treatment methods can improve the adhesion of the coating on the substrate by increasing the roughness of the metal surface, but there are problems such as affecting the appearance of the metal surface and reducing the coating efficiency. For the sandblasting method, the metal surface is roughened by shot blasting before the mechanical processing of metal parts, which can enhance the adhesion of the paint, but it will also affect the appearance of the metal surface. Summary of the invention

[0003] The purpose of the present invention is to provide a method for enhancing the paint adhesion of metal materials of aircraft composite packaging boxes, so as to effectively improve the paint adhesion of metal materials of aircraft composite packaging boxes.

[0004] The technical solution adopted by the present invention to achieve its purpose is as follows:

[0005] A method for enhancing the adhesion of metal material spray paint of an aircraft composite packaging box, comprising the following steps:

[0006] Pre-treat the metal surface of aircraft composite packaging boxes;

[0007] The metal adhesion promoter is diluted and then coated on the pre-treated metal surface to form a protective film on the metal surface, which is then baked and cured;

[0008] After baking and curing, the painting operation is carried out, first spraying the primer and then spraying the topcoat.

[0009] Further, the step of pre-treating the metal surface includes:

[0010] Use sandpaper to clean the metal surface, and then wipe the metal surface with acetone;

[0011] Grind the metal surface to increase the roughness;

[0012] Cover the metal surface with a wet cotton cloth soaked in pyruvic acid, let it sit for a while, and then wipe it to remove oxides and stains on the metal surface.

[0013] Further, let it stand for 15-20 minutes.

[0014] Furthermore, the dilution ratio of the metal adhesion promoter is 1:2.

[0015] Furthermore, the metal adhesion promoter is applied by brushing or spraying.

[0016] Furthermore, after coating the metal adhesion promoter on the metal surface, wait for 5-10 minutes to form a protective film on the metal surface.

[0017] Furthermore, the curing conditions are as follows: baking at 60-70° C. for 5-6 minutes.

[0018] Further, the specific steps of the painting operation include:

[0019] Spray the primer in the order of facade first and then inner corner;

[0020] Apply topcoat after the primer has dried.

[0021] The working principle of the metal adhesion promoter used in the present invention is:

[0022] 1. Formation of chemically bonded film: Metal adhesion promoter forms a film with chemical bonding properties on the metal surface. The film forms chemical bonds with metal atoms and combines with the coating material to establish a stable bridge. This not only enhances the adhesion between the metal and the coating, but also prevents oxygen and moisture from entering the metal by sealing the metal's shrinkage structure, thereby effectively improving the firmness of the coating.

[0023] 2. Physical adsorption enhancement: In addition to chemical bonding, metal adhesion promoter molecules can also generate strong forces with the metal surface through physical adsorption, further increasing the surface roughness, making the bonding between the coating and the substrate tighter and improving the adhesion performance.

[0024] 3. Improved surface wettability: Metal adhesion promoters significantly improve the wettability of coatings or adhesives, allowing them to spread evenly on the metal surface. This optimized spreading effect not only improves the bonding strength between the coating and the substrate, but also helps reduce defects during the coating process and improve spraying quality.

[0025] 4. Multi-effect protection: Through the combined effects of chemical bonding and physical adsorption, the metal adhesion promoter establishes a multi-effect protection barrier on the metal surface, enhances the interaction between the metal substrate and the coating, and ensures the durability and protective performance of the coating on the substrate surface.

[0026] The technical effects achieved by the present invention are:

[0027] 1. Improve adhesion and coating firmness: Through the combination of chemical bonding and physical adsorption, the interlayer adhesion between the metal substrate and the coating is significantly enhanced, solving problems such as paint peeling and flaking of the coating, ensuring the long-term stability and firmness of the coating.

[0028] 2. Enhanced anti-corrosion performance: The chemical protective film formed closes the micropores on the metal surface, preventing oxygen and moisture from penetrating, and effectively improving the anti-corrosion performance of metal materials. When applied to metal materials of aircraft composite packaging boxes, the anti-corrosion performance can be improved by 80%.

[0029] 3. Wide range of applications: It has a significant effect on improving the adhesion of a variety of metal materials (such as aluminum alloy, zinc alloy, stainless steel and electroplated surfaces), and is especially suitable for the coating processing needs of non-ferrous metal substrates.

[0030] 4. Improve coating effect: optimize the distribution and combination of coating on the metal surface, improve the uniformity and thickness stability of the paint film, and the coating after painting has better appearance quality and performance.

[0031] 5. Improve product quality and durability: significantly enhance the durability and reliability of the coating, ensure the coating effect of metal hardware products and aircraft composite packaging boxes, thereby improving the overall product quality and market competitiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a test comparison chart of iron metal plates at different dilution ratios.

[0033] Figure 2 This is a test comparison chart of stainless steel plates at different dilution ratios. DETAILED DESCRIPTION

[0034] In order to make the various technical features and advantages or technical effects in the above technical solutions of the present invention more obvious and easy to understand, they are described in detail below with reference to the accompanying drawings.

[0035] The embodiment of the present invention specifically discloses a method for enhancing the adhesion of metal material spray paint of an aircraft composite packaging box, comprising the following steps:

[0036] 1. Metal surface pretreatment

[0037] (1) Cleaning: Before painting, use 60# sandpaper to thoroughly clean the metal surface to remove grease, dust, rust and other impurities; then wipe the metal surface with cotton cloth dipped in acetone to ensure that the surface is clean and free of pollution.

[0038] (2) Grinding: For smooth metal surfaces, moderate grinding is performed to increase the surface roughness, thereby improving the adhesion of the paint. Pay attention to grinding evenly to avoid excessive roughness that affects the appearance and uniformity of the paint.

[0039] (3) Chemical treatment: Soak cotton cloth in pyruvic acid and evenly cover the surface to be treated, leaving it for 15-20 minutes; then wipe the surface with a clean cotton cloth to effectively remove oxides and stains that are difficult to remove by physical means, further improving adhesion.

[0040] 2. Use metal adhesion promoter

[0041] (1) Promoter dilution: Based on verification, the metal adhesion promoter is diluted in a ratio of 1:2 to ensure that the promoter can fully penetrate into the tiny pores on the metal surface and enhance the adhesion effect.

[0042] The dilution ratio of the metal adhesion promoter is crucial to the final adhesion effect. Figure 1 The test results of iron metal plates at different dilution ratios are shown, where (a) is the blank control group without the use of metal adhesion promoter; (b) is the metal adhesion promoter dilution ratio of 1:3, which is the ratio control group; (c) is the metal adhesion promoter dilution ratio of 1:2. From the comparison of the figure, it can be seen that the adhesion effect of the metal adhesion promoter at a dilution ratio of 1:2 is better than that at a dilution ratio of 1:3, and even better than that without the use of metal adhesion promoter.

[0043] Figure 2 The test results of stainless steel plates at different dilution ratios are shown, where (a) is the blank control group without the use of metal adhesion promoter; (b) is the metal adhesion promoter dilution ratio of 1:2; (c) is the metal adhesion promoter dilution ratio of 1:3, as the ratio control group. From the comparison of the figures, it can be seen that the adhesion effect of the metal adhesion promoter at a dilution ratio of 1:2 is better than that at a dilution ratio of 1:3, and even better than that without the use of metal adhesion promoter.

[0044] (2) Coating operation: Brush or spray the metal adhesion promoter on the treated metal surface and wait for 5-10 minutes to form a protective film on the surface. This film can prevent oxygen and moisture from entering the metal and prevent oxidation and corrosion.

[0045] (3) Baking treatment: After coating the accelerator, the metal surface is placed in an environment of 60-70°C for baking for 5-6 minutes to accelerate the curing of the accelerator.

[0046] 3. Painting

[0047] (1) Primer spraying: Primer is the first layer of the paint system. When spraying, spray the vertical surface first and then the inner corners to avoid dripping or missing. Primer helps to improve the adhesion of the topcoat.

[0048] (2) Topcoat spraying: The topcoat is the second layer, matching the hardness and elasticity of the primer to improve the durability and adhesion of the overall paint film.

[0049] To further improve the adhesion effect, the following three aspects can be optimized:

[0050] (1) Painting environment: Ensure that the painting operation is carried out under appropriate temperature and humidity to avoid affecting the curing speed and adhesion of the paint due to poor environment.

[0051] (2) Painting skills: Control the viscosity and dilution of the paint to ensure uniform spraying; keep the spraying direction consistent, and spray the next layer after each layer is dry to improve the thickness and uniformity of the paint film.

[0052] (3) Dust prevention measures: Take effective dust prevention measures during the coating process to prevent dust and other debris from contaminating the coating surface and affecting the adhesion effect.

[0053] Although the present invention has been disclosed as above by way of embodiments, it is not intended to limit the present invention. Appropriate modifications or equivalent substitutions of the technical solutions of the present invention made by ordinary technicians in the field should all be included in the protection scope of the present invention. The protection scope of the present invention shall be based on what is defined in the claims.

Claims

1. A method for enhancing the adhesion of metal paint spraying of aircraft composite packaging boxes, characterized in that: The following steps are involved: Pre-treat the metal surface of aircraft composite packaging boxes; The metal adhesion promoter is diluted and then coated on the pre-treated metal surface to form a protective film on the metal surface, which is then baked and cured; After baking and curing, the painting operation is carried out, first spraying the primer and then spraying the topcoat.

2. The enhancement method according to claim 1, characterized in that: The steps for pre-treating the metal surface include: Use sandpaper to clean the metal surface, and then wipe the metal surface with acetone; Grind the metal surface to increase the roughness; Cover the metal surface with a wet cotton cloth soaked in pyruvic acid, let it sit for a while, and then wipe it to remove oxides and stains on the metal surface.

3. The enhancement method according to claim 2, characterized in that: Let sit for 15-20 minutes.

4. The enhancement method according to claim 1, characterized in that: The dilution ratio of metal adhesion promoter is 1:

2.

5. The enhancement method according to claim 1, characterized in that: The metal adhesion promoter is applied by brushing or spraying.

6. The enhancement method according to claim 1, characterized in that: Wait 5-10 minutes after applying the metal adhesion promoter on the metal surface to form a protective film on the metal surface.

7. The enhancement method according to claim 1, characterized in that: The curing conditions are as follows: baking at 60-70°C for 5-6 minutes.

8. The enhancement method according to claim 1, characterized in that: The specific steps of the painting operation include: Spray the primer in the order of facade first and then inner corner; Apply topcoat after the primer has dried.

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