Rust-proof cleaning agent used after metal heat treatment

Abstract

The invention discloses an anti-rust cleaning agent used after metal heat treatment. The invention belongs to the technical field of metal surface treatment, and is characterized in that organic solvents including dipropylene glycol monomethyl ether, diethylene glycol monobutyl ether, dipropanol, alkyl-terminated block polyether, EDTA-2Na, potassium hydroxide, sodium gluconate, C10-12 dicarboxylic acid, monoethanolamine and boric acid ester are compounded, so that degreasing, oil removal and rust prevention are integrated; the problems of residues and rusting after the parts are washed are solved; the service life is long; the cleaning agent formula adopted by the invention not only has efficient cleaning capacity, but also can form a lasting antirust protective film on the metal surface, so that the problems that a traditional cleaning agent is short in antirust period and easy to lose efficacy are solved; through the synergistic effect of the functional auxiliary agents in the cleaning agent, the emulsifying capacity, the anti-rust performance and the stability of the cleaning agent are remarkably improved, and the cleaning agent is made to meet the cleaning and anti-rust requirements of various metal materials; in addition, the cleaning agent does not contain harmful substances such as sodium nitrite, meets the green and environment-friendly requirements, and has a wide application prospect.

Description

Technical Field

[0001] The present invention belongs to the technical field of metal surface treatment, and specifically refers to an anti-rust cleaning agent for metal after heat treatment. Background Art

[0002] In the field of automobile manufacturing, key components such as gears and shafts in transmission parts need to undergo heat treatment processes to improve their hardness and wear resistance to meet the high requirements in actual use. However, during the heat treatment quenching process, a large amount of quenching oil remains on the surface of the parts. The cleaning of these oil stains is difficult, which directly affects the subsequent processing and use performance. Currently, the industry generally uses a combined formula of strong alkali, inorganic salts, and sodium nitrite to clean and anti-rust the parts after heat treatment. Although this method can achieve the effects of degreasing and short-term anti-rust to a certain extent, it has many significant defects.

[0003] Firstly, the extensive use of strong alkali and inorganic salts will result in residues that are difficult to remove on the surface of the parts after cleaning. These residues are prone to cause white spot phenomena during the tempering process, which not only increases the difficulty of subsequent cleaning but also leads to an increase in production costs. Secondly, although sodium nitrite as an anti-rust agent has a certain effect, it has potential safety hazards and may generate carcinogenic nitrosamine compounds, posing a threat to the health of operators and environmental safety. In addition, the anti-rust period of the sodium nitrite aqueous solution is relatively short and it is prone to failure, resulting in rust problems for the parts during storage or transportation, affecting product quality. Finally, the service life of the existing cleaning agents is short. Usually, the bath solution will age and fail in about one month, requiring frequent replacement, further increasing the production maintenance cost and resource waste.

[0004] Therefore, developing an efficient, environmentally friendly and good anti-rust performance cleaning agent to solve the problems of cleaning residues, poor anti-rust effect, short service life, etc. existing in the prior art has become an urgent technical problem to be solved in the current field of metal cleaning after heat treatment. Summary of the Invention

[0005] The object of the present invention is to provide an anti-rust cleaning agent for metal after heat treatment. The present invention realizes the combination of degreasing, oil removal and anti-rust by compounding organic solvents such as dipropylene glycol methyl ether, diethylene glycol butyl ether, dipropanol, alkyl-capped block polyether, EDTA-2Na, potassium hydroxide, sodium gluconate, C10-12 dicarboxylic acid, monoethanolamine, and borate ester, solves the problems of residue and rusting after parts are washed, and has a long service life. The cleaning agent formula adopted by the present invention not only has high cleaning ability, but also can form a durable anti-rust protective film on the metal surface, solving the problems of short anti-rust period and easy failure of traditional cleaning agents; the functional auxiliaries in the cleaning agent significantly improve the emulsifying ability, anti-rust performance and stability of the cleaning agent through synergistic effects, making it suitable for the cleaning and anti-rust requirements of various metal materials; in addition, the cleaning agent does not contain harmful substances such as sodium nitrite, meets the requirements of green environmental protection, and has broad application prospects.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is as follows: An anti-rust cleaning agent for metal after heat treatment, the anti-rust cleaning agent comprising the following components in parts by weight: 5-20% of dipropylene glycol methyl ether; 5-20% of diethylene glycol butyl ether; 5-10% of dipropanol; 3-10% of alkyl-capped block polyether; 1-5% of EDTA-2Na; 5-10% of potassium hydroxide; 5-10% of sodium gluconate; 3-10% of C10-12 dicarboxylic acid; 5-10% of monoethanolamine; 5-10% of borate ester; and the balance of water.

[0007] Preferably, the alkyl-capped block polyether is a non-ionic surfactant.

[0008] Preferably, the EDTA-2Na is used as a chelating agent to combine with trace metal ions on the metal surface to inhibit interference.

[0009] Preferably, the potassium hydroxide and sodium gluconate act synergistically to adjust the pH value of the system to 8.5-9.5.

[0010] Preferably, the C10-12 dicarboxylic acid has complexing ability and film-forming performance to form a protective film on the metal surface.

[0011] Preferably, the monoethanolamine is used as a corrosion inhibitor to adsorb on the metal surface to form a protective layer.

[0012] Preferably, the borate ester is used as a long-acting anti-rust additive to generate a chemical protective film on the metal surface.

[0013] The present invention also provides a preparation method for an anti-rust cleaning agent for metal after heat treatment, the preparation method comprising the following steps:

[0014] (1) Mix dipropylene glycol methyl ether, diethylene glycol butyl ether and alkyl-capped block polyether, and stir at room temperature for 10 - 30 minutes to form a preliminary emulsion system;

[0015] (2) Dissolve EDTA-2Na in an appropriate amount of water, slowly add potassium hydroxide solution, adjust the pH value to 8.5 - 9.5, and continue to stir for 10 - 20 minutes to form a chelating solution;

[0016] (3) Mix sodium gluconate and C10 - 12 dicarboxylic acid, heat to 40 - 60 °C, and stir for 10 - 20 minutes to form a complexing solution;

[0017] (4) Add monoethanolamine and borate ester to the above mixture, stir at 40 - 60 °C for 20 - 40 minutes, and finally add the remaining water. After stirring evenly, cool to room temperature to obtain the finished cleaning agent.

[0018] The beneficial effects achieved by the present invention with the above structure are as follows: (1) The cleaning agent formula adopted by the present invention not only has high cleaning ability, but also can form a long-lasting rust-proof protective film on the metal surface, solving the problems of short rust-proof period and easy failure of traditional cleaning agents; (2) The functional additives in the present invention significantly improve the emulsifying ability, rust-proof performance and stability of the cleaning agent through synergistic effects, making it suitable for the cleaning and rust-proof requirements of various metal materials; (3) The present invention does not contain harmful substances such as sodium nitrite, meets the requirements of green environmental protection, and has broad application prospects. Description of the Drawings

[0019] Figure 1 The oil removal rate of an anti-rust cleaning agent for metal after heat treatment.

[0020] The drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention, and do not constitute a limitation to the present invention. Detailed Embodiments

[0021] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments; based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0022] Unless otherwise defined, all professional and scientific terms used herein have the same meaning as those familiar to those skilled in the art. In addition, any methods and materials similar or equivalent to the described content can be applied to the present invention. The preferred implementation methods and materials described herein are only for illustrative purposes and do not limit the content of this application.

[0023] In the experimental methods in the following examples, unless otherwise specified, they are all conventional methods; the test materials and test strains used in the following examples, unless otherwise specified, are all purchased from commercial channels.

[0024] Example 1

[0025] An anti-rust cleaning agent for metal after heat treatment

[0026] The anti-rust cleaning agent comprises the following components in parts by weight: dipropylene glycol methyl ether 5%; diethylene glycol butyl ether 20%; dipropanol 5%; alkyl-capped block polyether 10%; EDTA-2Na 1%; potassium hydroxide 10%; sodium gluconate 5%; C10-12 dicarboxylic acid 10%; monoethanolamine 5%; boric acid ester 10%; the balance being water.

[0027] Among them, the alkyl-capped block polyether is a non-ionic surfactant.

[0028] Among them, the EDTA-2Na acts as a chelating agent to combine with trace metal ions on the metal surface to inhibit interference.

[0029] Among them, the potassium hydroxide and sodium gluconate act synergistically to adjust the pH value of the system to 8.5 - 9.5.

[0030] Among them, the C10-12 dicarboxylic acid has complexing ability and film-forming performance to form a protective film on the metal surface.

[0031] Among them, the monoethanolamine acts as a corrosion inhibitor and adsorbs on the metal surface to form a protective layer.

[0032] Among them, the boric acid ester acts as a long-acting anti-rust additive to generate a chemical protective film on the metal surface.

[0033] The present invention also provides a preparation method for an anti-rust cleaning agent for metal after heat treatment, and the preparation method comprises the following steps:

[0034] (1) Mix dipropylene glycol methyl ether, diethylene glycol butyl ether and alkyl-capped block polyether, and stir at room temperature for 10 - 30 minutes to form a preliminary emulsion system;

[0035] (2) Dissolve EDTA-2Na in an appropriate amount of water, slowly add a potassium hydroxide solution, adjust the pH value to 8.5 - 9.5, and continue stirring for 10 - 20 minutes to form a chelating solution;

[0036] (3) Mix sodium gluconate and C10-12 dicarboxylic acid, heat to 40 - 60 °C, and stir for 10 - 20 minutes to form a complexing solution;

[0037] (4) Add monoethanolamine and borate ester into the above-mentioned mixed solution, stir at 40 - 60 °C for 20 - 40 minutes, and finally add the remaining water. After stirring evenly, cool to room temperature to obtain the finished cleaning agent.

[0038] Example 2

[0039] An anti-rust cleaning agent for metal after heat treatment

[0040] The anti-rust cleaning agent comprises the following components in parts by weight: dipropylene glycol methyl ether 20%; diethylene glycol butyl ether 5%; dipropanol 10%; alkyl-capped block polyether 3%; EDTA-2Na 5%; potassium hydroxide 5%; sodium gluconate 10%; C10-12 dicarboxylic acid 3%; monoethanolamine 10%; borate ester 5%; the balance is water.

[0041] Among them, the alkyl-capped block polyether is a non-ionic surfactant.

[0042] Among them, the EDTA-2Na, as a chelating agent, combines with trace metal ions on the metal surface to inhibit interference.

[0043] Among them, the potassium hydroxide and sodium gluconate act synergistically to adjust the pH value of the system to 8.5 - 9.5.

[0044] Among them, the C10-12 dicarboxylic acid has complexing ability and film-forming performance to form a protective film on the metal surface.

[0045] Among them, the monoethanolamine, as a corrosion inhibitor, adsorbs on the metal surface to form a protective layer.

[0046] Among them, the borate ester, as a long-acting anti-rust additive, generates a chemical protective film on the metal surface.

[0047] The present invention also provides a preparation method for the anti-rust cleaning agent for metal after heat treatment, and the preparation method is carried out with reference to Example 1.

[0048] Example 3

[0049] An anti-rust cleaning agent for metal after heat treatment

[0050] The anti-rust cleaning agent comprises the following components in parts by weight: dipropylene glycol methyl ether 12%; diethylene glycol butyl ether 12%; dipropanol 8%; alkyl-capped block polyether 7%; EDTA-2Na 3%; potassium hydroxide 7%; sodium gluconate 7%; C10-12 dicarboxylic acid 7%; monoethanolamine 8%; borate ester 8%; the balance is water.

[0051] Among them, the alkyl-capped block polyether is a non-ionic surfactant.

[0052] Among them, the EDTA-2Na, as a chelating agent, binds to trace metal ions on the metal surface to inhibit interference.

[0053] Among them, the potassium hydroxide and sodium gluconate act synergistically to adjust the pH value of the system to 8.5 - 9.5.

[0054] Among them, the C10-12 dibasic carboxylic acid has complexing ability and film-forming property to form a protective film on the metal surface.

[0055] Among them, the monoethanolamine, as a corrosion inhibitor, adsorbs on the metal surface to form a protective layer.

[0056] Among them, the borate ester, as a long-acting rust preventive additive, generates a chemical protective film on the metal surface.

[0057] The present invention also provides a preparation method for an anti-rust cleaning agent for metal after heat treatment, and the preparation method is carried out with reference to Example 1.

[0058] Test Example 1

[0059] Test on the cleaning effect of an anti-rust cleaning agent for metal after heat treatment

[0060] The anti-rust cleaning agents prepared in Examples 1 - 3 were used as experimental materials and divided into Example 1 group, Example 2 group, and Example 3 group, and the control group used a common anti-rust cleaning agent on the market. The workpieces were immersed in the cleaning agents of each group and ultrasonically cleaned at 50 °C for 10 minutes. The mass of the workpieces was weighed before and after cleaning, and the oil removal rate was calculated.

[0061] Result analysis: As Figure 1 shown, the oil removal rates of the groups of Examples 1 - 3 are all higher than those of the control group, and among them, the oil removal rate of the group of Example 3 is the highest.

[0062] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirits of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

[0063] The above has described the present invention and its embodiments, and this description is not restrictive. What is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Generally speaking, if those of ordinary skill in the art are inspired by it and, without departing from the gist of the present invention, design similar structural modes and embodiments without creative efforts, they shall fall within the protection scope of the present invention.

Claims

1. An anti-rust cleaning agent for metal after heat treatment, characterized in that: The rust-proof cleaning agent comprises the following components in parts by weight: dipropylene glycol methyl ether 5-20%; diethylene glycol butyl ether 5-20%; dipropanol 5-10%; alkyl-capped block polyether 3-10%; EDTA-2Na 1-5%; potassium hydroxide 5-10%; sodium gluconate 5-10%; C10-12 dicarboxylic acid 3-10%; monoethanolamine 5-10%; boric acid ester 5-10%; and the balance is water.

2. The rust-proof cleaning agent for metal heat treatment according to claim 1, characterized in that: The alkyl-capped block polyether is a non-ionic surfactant.

3. The rust-proof cleaning agent for metal after heat treatment according to claim 2, wherein: The EDTA-2Na acts as a chelating agent to combine with trace metal ions on the metal surface to inhibit interference.

4. The rust-proof cleaning agent for metal after heat treatment according to claim 3, characterized in that: The potassium hydroxide and sodium gluconate act synergistically to adjust the pH value of the system to 8.5-9.

5.

5. The rust-proof cleaning agent for metal heat treatment according to claim 4, characterized in that: The C10-12 dicarboxylic acid has complexing ability and film-forming performance to form a protective film on the metal surface.

6. The rust-proof cleaning agent for metal after heat treatment according to claim 5, wherein: The monoethanolamine acts as a corrosion inhibitor and adsorbs on the metal surface to form a protective layer.

7. An anti-rust cleaning agent for metal after heat treatment according to claim 6, characterized in that: The boric acid ester acts as a long-acting rust-proof additive to generate a chemical protective film on the metal surface.

8. A preparation method of the rust-proof cleaning agent for metal after heat treatment according to claim 7, characterized in that: The preparation method comprises the following steps: (1) Mix dipropylene glycol methyl ether, diethylene glycol butyl ether and alkyl-capped block polyether, and stir at room temperature for 10-30 minutes to form a preliminary emulsion system; (2) Dissolve EDTA-2Na in an appropriate amount of water, slowly add potassium hydroxide solution, adjust the pH value to 8.5-9.5, and continue to stir for 10-20 minutes to form a chelating solution; (3) Mix sodium gluconate and C10-12 dicarboxylic acid, heat to 40-60 °C, and stir for 10-20 minutes to form a complexing solution; (4) Add monoethanolamine and boric acid ester to the above mixture, stir at 40-60 °C for 20-40 minutes, and finally add the remaining water. After stirring evenly, cool to room temperature to obtain the finished cleaning agent.

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