Metal surface cleaning degumming agent with antirust function

Abstract

The invention discloses a metal surface cleaning degumming agent with an antirust function, which belongs to the technical field of metal surface treatment and comprises an organic solvent, a surfactant, a corrosion inhibitor, an alkaline compound, a chelating agent and deionized water. Adhesive residues, oil stains and oxides on the metal surface can be effectively removed, meanwhile, a protective film is formed on the metal surface, and secondary oxidation corrosion is prevented.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metal surface treatment, in particular to a metal surface cleaning degreasing agent with rust prevention function. BACKGROUND

[0002] In the production, processing and use of metal materials, various adhesive, adhesive tape, label and protective film and other bonding materials are often used. These materials often leave adhesive residues on the metal surface after use, which affects the subsequent processing and use effect. The commonly used degreasing methods mainly include mechanical scraping, organic solvent cleaning, alkaline degreasing agent treatment, etc.

[0003] Although the mechanical scraping method is simple and direct, it is easy to damage the surface of the metal substrate, especially for precision parts and surface treated metal materials, which will cause irreversible damage. The organic solvent cleaning method, such as using acetone and xylene, has good solubility for adhesives, but has the safety hazards of high volatility, strong toxicity, flammability and explosion, and no rust protection effect on the metal surface. The metal surface is easy to oxidize and rust after cleaning.

[0004] Alkaline degreasing agent is a kind of degreasing product widely used in industry, which mainly realizes degreasing through the saponification of alkali to adhesive, but the traditional alkaline degreasing agent has the following disadvantages: (1) Low degreasing efficiency, poor removal effect on high crosslinking degree adhesives such as acrylic pressure sensitive adhesive and epoxy adhesive; (2) Strong alkaline easily corrodes the metal substrate, especially the amphoteric metal such as aluminum and zinc; (3) The metal surface is easy to rust after cleaning, and needs to be additionally treated for rust prevention; (4) Phosphorus component easily causes eutrophication of water body, poor environmental protection. SUMMARY

[0005] The present application provides a metal surface cleaning degreasing agent with rust prevention function to solve the above problems.

[0006] In order to achieve the above purpose, the technical scheme of the present application is as follows: A metal surface cleaning degreasing agent with rust prevention function, the metal surface cleaning degreasing agent is composed of the following components by mass percentage: Organic solvent 15-40%; Surfactant 5-15%; Corrosion inhibitor 3-10%; Alkaline compound 2-8%; Chelating agent 1-5%; Rust inhibitor 0.5-5%; The balance is deionized water.

[0007] In a preferred embodiment of the present application, the organic solvent is selected from a mixture of at least two of dimethyl sulfoxide, N-methyl pyrrolidone, ethylene glycol phenyl ether, and propylene glycol methyl ether acetate.

[0008] In a preferred embodiment of the present application, the surfactant is a complex of an anionic surfactant and a non-ionic surfactant, with a mass ratio of 1:0.5-1:2.

[0009] In a preferred embodiment of the present application, the corrosion inhibitor is a mixture of benzotriazole and sodium molybdate, with a mass ratio of 1:1-1:3.

[0010] In a preferred embodiment of the present application, the basic compound is selected from at least one of monoethanolamine, diethanolamine, triethanolamine, and potassium hydroxide.

[0011] In a preferred embodiment of the present application, the chelating agent is a mixture of disodium ethylenediaminetetraacetate and sodium citrate, with a mass ratio of 1:1-1:2.

[0012] In a preferred embodiment of the present application, the anti-rust additive is a mixture of alkyl succinic anhydride and triazine anti-rust agent, with a mass ratio of 1:0.5-1:1.

[0013] The present application also provides a preparation method of the metal surface cleaning and degreasing agent described above, comprising the following steps: Add deionized water to the reaction kettle and heat to 40-50°C Add the basic compound and stir to dissolve Add the surfactant and continue stirring for 10-15 minutes Add the organic solvent and maintain the temperature at 40-50°C, and stir to mix Add the chelating agent, corrosion inhibitor, and anti-rust additive, and continue stirring for 20-30 minutes Cool to room temperature and filter to obtain the finished product The present application also provides a metal surface treatment method, which uses the metal surface cleaning and degreasing agent described above for treatment, comprising: (1) Spray or brush the degreasing agent on the metal surface; (2) Act at 25-40°C for 5-15 minutes; (3) Remove the residue by high-pressure water flushing or mechanical wiping; The present application provides a metal surface cleaning and degreasing agent with anti-rust function to solve the above problems.

[0014] To achieve the above purpose, the technical solution of the present application is as follows: A metal surface cleaning degreasing agent with rust-proof function, the metal surface cleaning degreasing agent is composed of the following components in mass percentage: Organic solvent 15-40%; Surfactant 5-15%; Corrosion inhibitor 3-10%; Alkaline compound 2-8%; Chelating agent 1-5%; Rust inhibitor 0.5-5%; The balance is deionized water.

[0015] In a preferred embodiment of the present application, the organic solvent is selected from a mixture of at least two of dimethyl sulfoxide, N-methyl pyrrolidone, ethylene glycol phenyl ether, propylene glycol methyl ether acetate.

[0016] In a preferred embodiment of the present application, the surfactant is a complex of anionic surfactant and nonionic surfactant, with a mass ratio of 1:0.5-1:2.

[0017] In a preferred embodiment of the present application, the corrosion inhibitor is a mixture of benzotriazole and sodium molybdate, with a mass ratio of 1:1-1:3.

[0018] In a preferred embodiment of the present application, the alkaline compound is selected from at least one of monoethanolamine, diethanolamine, triethanolamine, potassium hydroxide.

[0019] In a preferred embodiment of the present application, the chelating agent is a mixture of ethylenediaminetetraacetic acid disodium and sodium citrate, with a mass ratio of 1:1-1:2.

[0020] In a preferred embodiment of the present application, the rust inhibitor is a mixture of alkyl succinic anhydride and triazine rust inhibitor, with a mass ratio of 1:0.5-1:1.

[0021] The present application also provides a preparation method of the above-mentioned metal surface cleaning degreasing agent, comprising the following steps: Add deionized water to the reaction kettle and heat to 40-50℃ Add alkaline compound and stir to dissolve Add surfactant and continue to stir for 10-15 minutes Add organic solvent and keep the temperature at 40-50℃, stir and mix Add chelating agent, corrosion inhibitor and rust inhibitor, continue to stir for 20-30 minutes Cool to room temperature, filter to get the finished product The present application also provides a metal surface treatment method, using the above-mentioned metal surface cleaning degreasing agent for treatment, comprising: (1) spray or brush the degreasing agent on the metal surface; (2) act for 5-15 minutes at 25-40℃; (3) remove the residues by high-pressure water flushing or mechanical wiping; Performance index Example 1 Example 2 Comparative example Pressure-sensitive adhesive removal rate (%) 99.2 98.7 85.3 Epoxy adhesive removal rate (%) 96.8 95.2 72.6 Rust prevention period (days) >30 >30 <7 Carbon steel corrosion rate (mm / a) 0.008 0.009 0.152 Aluminum alloy corrosion None None Obvious VOC content (g / L) 128 135 210 Treatment cost (yuan / m2) 0.85 0.92 1.20 The treatment effects on different metal surfaces by using the above examples are as follows: Metal type Adhesive removal rate (%) Surface state Rust prevention period (days) Q235 carbon steel 99.2 Clean, no residue >30 304 stainless steel 98.5 Clean, no residue >30 6061 aluminum alloy 96.8 Clean, no white spot >30 H62 brass 97.5 Clean, no discoloration >30 ZL102 cast aluminum 95.6 Clean, no corrosion >30 Based on the above examples: The present application provides rust protection by the penetration and swelling effect of the organic solvent on the adhesive, the wetting and penetration function of the surfactant, the peeling of the adhesive from the metal surface, the promotion of the hydrolytic cleavage of the adhesive molecular chain by the alkaline component, the prevention of the re-deposition of metal ions by the chelating agent, and the formation of a self-assembled monolayer on the cleaned metal surface by the rust inhibitor, thereby providing rust protection; The present application provides comprehensive and long-term rust protection by the directional arrangement of the hydrophobic alkyl chain in the alkyl succinic anhydride molecule on the metal surface to form a dense hydrophobic layer, the formation of a coordination bond protection film by the coordination of the heterocyclic nitrogen atom of the triazine rust inhibitor with the metal surface, the formation of a MoO2 protection film on the metal surface by the molybdate, and the formation of a Cu(I)-BTA polymer protection film on the copper surface by the benzotriazole, through the synergistic effect of multiple rust prevention mechanisms. The biodegradability of the present application is more than 85%, which is much higher than that of traditional solvent-based degreasing agents. The acute toxicity test on zebrafish shows that the 96-hour LC 50 >100 mg / L, which belongs to a low-toxicity product.

[0022] Compared with the traditional process such as degreasing + water washing + rust treatment, the use of the degreasing agent of the present application can reduce 2 processes, save 50% of water, reduce the treatment cost by about 30%, and improve the production efficiency by more than 40%.

[0023] The basic principles and main features of the present application and the advantages of the present application are shown and described. It should be understood by those skilled in the art that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A metal surface cleaning and degumming agent with rust-preventing function, characterized in that, The metal surface cleaning degreasing agent is composed of the following components by mass percentage: Organic solvent 15-40%; Surfactant 5-15%; Corrosion inhibitor 3-10%; Alkaline compound 2-8%; Chelating agent 1-5%; Rust inhibitor 0.5-5%; The balance is deionized water.

2. The metal surface cleaning and degreasing agent with rust-proof function according to claim 1, characterized in that, The organic solvent is selected from a mixture of at least two of dimethyl sulfoxide, N-methyl pyrrolidone, ethylene glycol phenyl ether, and propylene glycol methyl ether acetate.

3. The metal surface cleaning and degreasing agent with anti-rust function according to claim 1, characterized in that, The surfactant is a complex of anionic surfactant and non-ionic surfactant, with a mass ratio of 1:0.5-1:

2.

4. The metal surface cleaning and degreasing agent with rust-proof function according to claim 1, characterized in that, The corrosion inhibitor is a mixture of benzotriazole and sodium molybdate, with a mass ratio of 1:1-1:

3.

5. The metal surface cleaning and degreasing agent with rust-proof function according to claim 1, characterized in that, The alkaline compound is selected from at least one of monoethanolamine, diethanolamine, triethanolamine, and potassium hydroxide.

6. The metal surface cleaning and degreasing agent with rust-proof function according to claim 1, characterized in that, The chelating agent is a mixture of disodium ethylenediaminetetraacetate and sodium citrate, with a mass ratio of 1:1-1:

2.

7. The metal surface cleaning and degreasing agent with anti-rust function according to claim 1, characterized in that, The rust inhibitor is a mixture of alkyl succinic anhydride and triazine rust inhibitor, with a mass ratio of 1:0.5-1:

1.

8. A process for the preparation of the metal surface cleaning and degreasing agent according to any one of claims 1 to 7, characterized in that, The method comprises the following steps: Add deionized water to the reaction kettle and heat to 40-50℃ Add alkaline compound, stir to dissolve Add surfactant, continue to stir for 10-15 minutes Add organic solvent, keep the temperature at 40-50℃, stir and mix Add chelating agent, corrosion inhibitor and rust inhibitor, continue to stir for 20-30 minutes Cool to room temperature, filter to obtain the finished product.

9. A method for treating a metal surface, characterized by, The metal surface cleaning degreasing agent of any one of claims 1-7 is used for treatment, which comprises: (1) Spray or brush the degreasing agent on the metal surface; (2) Act at 25-40℃ for 5-15 minutes; (3) Remove the residue by high-pressure water washing or mechanical wiping; (4) Dry the metal surface.

10. The metal surface treatment method according to claim 9, characterized by, The treated metal surface forms a 0.5-2μm thick rust protection film.