Anti-rust metal cleaning agent and preparation method thereof

Abstract

The invention discloses an anti-rust metal cleaning agent which comprises the following components in parts by weight: 10-15 parts of a composite anti-rust agent, 3-6 parts of an anti-rust auxiliary agent, 4-8 parts of an amine compound, 4-8 parts of a cleaning auxiliary agent, 3-6 parts of a surfactant, 4-8 parts of a solubilizer and 55-70 parts of water, the composite antirust agent is composed of alcohol amine and organic acid according to the weight ratio of 1: (0.1-0.5), the alcohol amine is monoethanolamine or diethanolamine, and the organic acid is selected from undecanedioic acid, decanedioic acid, neodecanedioic acid, sebacic acid or triazine polycarboxylic acid. The anti-rust metal cleaning agent has excellent cleaning capacity and anti-rust effect, can clean away oil stains on the surface of a metal workpiece, enables the workpiece to have excellent inter-process anti-rust effect, and can effectively solve the problem that the anti-rust capacity and the cleaning capacity of an existing anti-rust metal cleaning agent cannot be considered at the same time. The rust-proof metal cleaning agent is especially suitable for rust-proof cleaning of steel parts.

Description

Technical Field

[0001] The invention relates to an anti-rust metal cleaning agent and a preparation method thereof, belonging to the technical field of industrial cleaning. Background Art

[0002] During production, processing, transportation, use, and storage, metal parts are often exposed to oxygen, moisture, and other corrosive media in the air. These substances can easily cause electrochemical corrosion on the metal surface, leading to rust. This not only affects the metal's appearance but also weakens its strength and durability. Therefore, rust prevention is crucial for metal products. Furthermore, during production, processing, and transportation, metal parts often acquire stains such as oil, dust, and shavings. Failure to remove these stains can affect subsequent processing, impacting the product's quality and lifespan. Therefore, surface cleaning and rust prevention are essential for metal parts.

[0003] Traditional metal cleaning requires a step-by-step process, typically: cleaning with detergent → washing → passivation → rust prevention. This process is complex, energy-intensive, and can easily lead to residual corrosive agents on the metal surface due to incomplete washing. Therefore, developing a rust-proof metal cleaning agent that combines excellent cleaning and rust prevention capabilities is crucial.

[0004] An ideal anti-rust metal cleaner needs to have sufficient cleaning power to remove rust, oil, and dirt, while also forming a protective film on the metal surface to prevent further rust. Currently, anti-rust metal cleaners on the market generally lack the ability to balance cleaning and anti-rust capabilities. Furthermore, most anti-rust metal cleaners contain corrosive and toxic ingredients, such as chlorides and acids, which are harmful to the environment, especially if improperly handled and disposed of, resulting in environmental pollution and health risks. Some anti-rust metal cleaners can also corrode or damage metal surfaces, leading to excessive oxidation or deterioration. Summary of the Invention

[0005] The purpose of the present invention is to solve the problem that the existing anti-rust metal cleaning agents cannot take into account both rust prevention and cleaning capabilities, and to provide an anti-rust metal cleaning agent with environmentally friendly ingredients and excellent cleaning and anti-rust capabilities.

[0006] Another object of the present invention is to provide a method for preparing the above-mentioned rust-proof metal cleaning agent.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions: A rust-proof metal cleaning agent, which is composed of the following components in parts by weight: 10-15 parts of composite rust inhibitor, 3-6 parts of rust inhibitor, 4-8 parts of amine compound, 4-8 parts of cleaning agent, 3-6 parts of surfactant, 4-8 parts of solubilizer, 55-70 parts of water; The composite rust preventive agent is composed of alcohol amine and organic acid in a weight ratio of 1: (0.1-0.5); The alcoholamine is one of monoethanolamine or diethanolamine or a combination of the two in any proportion; The organic acid is selected from one or a combination of two or more of undecanedioic acid, decanoic acid, neodecanoic acid, sebacic acid or triazine polycarboxylic acid in any proportion, and more preferably a composition of undecanedioic acid, sebacic acid and triazine polycarboxylic acid in a mass ratio of 1:1:1.

[0008] Furthermore, the anti-rust additive is selected from any one of polycarboxylic acid organic amine, alkyl phosphate, potassium dichromate, sodium molybdate, trisodium phosphate, lauric acid monoethanolamide or benzotriazole.

[0009] Furthermore, the amine compound is selected from one or a combination of two or more of monoethanolamine, triethanolamine, MDEA (N-methyldiethanolamine) or DMEA (dimethylethanolamine) in any proportion. The main function of the amine compound is to increase and maintain the pH value of the system and adjust the pH value of the system to above 9.5. However, the amount used should not be too high. If the pH value of the system is too high, it will endanger the safety of the operator.

[0010] Furthermore, the cleaning aid is selected from one or a combination of two or more of potassium pyrophosphate, sodium citrate or sodium gluconate in any proportion.

[0011] Furthermore, the surfactant is selected from one of PSO-100 (Nanjing Gutian Chemical Co., Ltd.), AEO-7, OP-10 or linear alkylbenzene sulfonate.

[0012] Furthermore, the solubilizing agent is selected from one of sodium toluenesulfonate, diethylene glycol monobutyl ether, urea, PEG-400 or 3-aminopropyltriethoxysilane.

[0013] The preparation method of the above-mentioned rust-proof metal cleaning agent comprises the following steps: adding the composite rust-proof agent to water, stirring and mixing evenly, then sequentially adding the rust-proof auxiliary agent, amine compound, cleaning auxiliary agent, surfactant and solubilizer, stirring evenly, to obtain the rust-proof metal cleaning agent.

[0014] Beneficial effects of the present invention: (1) The rust-proof metal cleaning agent of the present invention contains a composite rust-proof agent, which is composed of an alcohol amine and an organic acid. The two react to form an amide compound. The amide group has both ion-bonding physical adsorption and covalent-bonding chemical adsorption, so it can be adsorbed on the surface of the workpiece, blocking the contact between the workpiece and water, and achieving a good rust-proof effect.

[0015] (2) The rust-proof metal cleaning agent of the present invention contains amine compounds, which can not only maintain a high pH value of the system, but also have good buffering properties for the pH of the system, thereby increasing the durability of pH stability.

[0016] (3) The rust-proof metal cleaning agent of the present invention has excellent cleaning ability and rust-proof effect. When applied to metal workpieces that need to be cleaned and rust-proofed between processes, it can clean the oil stains on the surface of the workpiece while enabling the workpiece to have very good rust-proof effect between processes. The rust-proof metal cleaning agent of the present invention is particularly suitable for rust-proof cleaning of steel parts. DETAILED DESCRIPTION

[0017] The technical solution of the present invention is further described below in conjunction with specific embodiments.

[0018] Example 1 A rust-proof metal cleaning agent, comprising the following components in parts by weight: 13 parts of a composite rust preventive agent, 4 parts of a rust-proofing auxiliary agent, 5 parts of an amine compound, 5 parts of a cleaning auxiliary agent, 4 parts of a surfactant, 5 parts of a solubilizing agent, and 64 parts of water; The composite rust inhibitor consists of an alcohol amine and an organic acid in a mass ratio of 1:0.3, the alcohol amine is monoethanolamine, and the organic acid consists of undecanedioic acid, sebacic acid and triazine polycarboxylic acid in a mass ratio of 1:1:1.

[0019] The anti-rust additive is a polycarboxylic acid organic amine (brand DX320, purchased from Dexu New Materials Co., Ltd.).

[0020] The amine compound is triethanolamine.

[0021] The cleaning aid is potassium pyrophosphate.

[0022] The surfactant is AEO-7.

[0023] The solubilizing agent is 3-aminopropyltriethoxysilane.

[0024] The preparation method of the above-mentioned rust-proof metal cleaning agent is as follows: a composite rust preventive is added to water, stirred at a speed of 600 r / min for 30 minutes, and then a rust preventive agent, an amine compound, a cleaning aid, a surfactant and a solubilizer are added in sequence, and stirred at a speed of 600 r / min for 30 minutes to obtain the rust-proof metal cleaning agent.

[0025] Example 2 A rust-proof metal cleaning agent, comprising the following components in parts by weight: 11 parts of a composite rust preventive agent, 4 parts of a rust-proofing auxiliary agent, 5 parts of an amine compound, 5 parts of a cleaning auxiliary agent, 4 parts of a surfactant, 5 parts of a solubilizing agent, and 66 parts of water; The composite rust inhibitor consists of an alcohol amine and an organic acid in a mass ratio of 1:0.375, the alcohol amine is monoethanolamine, and the organic acid consists of undecanedioic acid, sebacic acid and triazine polycarboxylic acid in a mass ratio of 1:1:1.

[0026] The anti-rust additive is a polycarboxylic acid organic amine (brand DX320, purchased from Dexu New Materials Co., Ltd.).

[0027] The amine compound is triethanolamine.

[0028] The cleaning aid is potassium pyrophosphate.

[0029] The surfactant is PSO-100, purchased from Nanjing Gutian Chemical Co., Ltd.

[0030] The solubilizing agent is 3-aminopropyltriethoxysilane.

[0031] The preparation method of the above-mentioned rust-proof metal cleaning agent is as follows: a composite rust preventive is added to water, stirred at a speed of 600 r / min for 30 minutes, and then a rust preventive agent, an amine compound, a cleaning aid, a surfactant and a solubilizer are added in sequence, and stirred at a speed of 600 r / min for 30 minutes to obtain the rust-proof metal cleaning agent.

[0032] Example 3 A rust-proof metal cleaning agent, comprising the following components in parts by weight: 13 parts of a composite rust preventive agent, 4 parts of a rust-proofing auxiliary agent, 5 parts of an amine compound, 5 parts of a cleaning auxiliary agent, 4 parts of a surfactant, 5 parts of a solubilizing agent, and 64 parts of water; The composite rust inhibitor consists of an alcohol amine and an organic acid in a mass ratio of 1:0.3, the alcohol amine is diethanolamine, and the organic acid consists of undecanedioic acid, sebacic acid and triazine polycarboxylic acid in a mass ratio of 1:1:1.

[0033] The anti-rust additive is a polycarboxylic acid organic amine (brand DX320, purchased from Dexu New Materials Co., Ltd.).

[0034] The amine compound is triethanolamine.

[0035] The cleaning aid is potassium pyrophosphate.

[0036] The surfactant is AEO-7.

[0037] The solubilizing agent is 3-aminopropyltriethoxysilane.

[0038] The preparation method of the above-mentioned rust-proof metal cleaning agent is as follows: a composite rust preventive is added to water, stirred at a speed of 600 r / min for 30 minutes, and then a rust preventive agent, an amine compound, a cleaning aid, a surfactant and a solubilizer are added in sequence, and stirred at a speed of 600 r / min for 30 minutes to obtain the rust-proof metal cleaning agent.

[0039] Comparative Example 1 A rust-proof metal cleaning agent, comprising the following components in parts by weight: 13 parts of a composite rust preventive, 5 parts of an amine compound, 5 parts of a cleaning aid, 4 parts of a surfactant, 5 parts of a solubilizer, and 68 parts of water; The composite rust inhibitor consists of an alcohol amine and an organic acid in a mass ratio of 1:0.3, the alcohol amine is monoethanolamine, and the organic acid consists of undecanedioic acid, sebacic acid and triazine polycarboxylic acid in a mass ratio of 1:1:1.

[0040] The amine compound is triethanolamine.

[0041] The cleaning aid is potassium pyrophosphate.

[0042] The surfactant is AEO-7.

[0043] The solubilizing agent is 3-aminopropyltriethoxysilane.

[0044] The preparation method of the above-mentioned rust-proof metal cleaning agent is as follows: a composite rust preventive is added to water, stirred at a speed of 600 r / min for 30 minutes, and then an amine compound, a cleaning aid, a surfactant and a solubilizer are added in sequence, and stirred at a speed of 600 r / min for 30 minutes to obtain the rust-proof metal cleaning agent.

[0045] Comparative Example 2 An anti-rust metal cleaning agent, comprising the following components in parts by weight: 8 parts of a rust inhibitor, 4 parts of an anti-rust auxiliary agent, 5 parts of an amine compound, 5 parts of a cleaning auxiliary agent, 4 parts of a surfactant, 5 parts of a solubilizer, and 69 parts of water; The rust inhibitor is monoethanolamine.

[0046] The anti-rust additive is a polycarboxylic acid organic amine (brand DX320, purchased from Dexu New Materials Co., Ltd.).

[0047] The amine compound is triethanolamine.

[0048] The cleaning aid is potassium pyrophosphate.

[0049] The surfactant is AEO-7.

[0050] The solubilizing agent is 3-aminopropyltriethoxysilane.

[0051] The preparation method of the above-mentioned rust-proof metal cleaning agent is as follows: add the rust-proof agent to water, stir at a speed of 600 r / min for 30 minutes, then add the rust-proof auxiliary agent, amine compound, cleaning auxiliary agent, surfactant and solubilizer in sequence, and stir at a speed of 600 r / min for 30 minutes to obtain the rust-proof metal cleaning agent.

[0052] Comparative Example 3 A rust-proof metal cleaning agent, comprising the following components in parts by weight: 3 parts of a composite rust preventive agent, 4 parts of a rust-proofing auxiliary agent, 5 parts of an amine compound, 5 parts of a cleaning auxiliary agent, 4 parts of a surfactant, 5 parts of a solubilizing agent, and 74 parts of water; The composite rust inhibitor consists of undecanedioic acid, sebacic acid and triazine polycarboxylic acid in a mass ratio of 1:1:1.

[0053] The anti-rust additive is a polycarboxylic acid organic amine (brand DX320, purchased from Dexu New Materials Co., Ltd.).

[0054] The amine compound is triethanolamine.

[0055] The cleaning aid is potassium pyrophosphate.

[0056] The surfactant is AEO-7.

[0057] The solubilizing agent is 3-aminopropyltriethoxysilane.

[0058] The preparation method of the above-mentioned rust-proof metal cleaning agent is as follows: a composite rust preventive is added to water, stirred at a speed of 600 r / min for 30 minutes, and then a rust preventive agent, an amine compound, a cleaning aid, a surfactant and a solubilizer are added in sequence, and stirred at a speed of 600 r / min for 30 minutes to obtain the rust-proof metal cleaning agent.

[0059] The rust-proof metal cleaning agents prepared in Examples 1-3 and Comparative Examples 1-3 were tested for physical and chemical indicators (density, refractive index, pH value, rust-proof performance), rust-proof performance, and cleaning ability: (1) Density The density is tested using the method of GB / T 1884-2000. The normal range of density is: 1.0000~1.1000g / cm 3 .

[0060] (2) Refractive index reading The refractive index reading is tested using the method of GB / T 614-2021. The normal range of refractive index reading is: 15-30.

[0061] (3) pH value Dilute the anti-rust metal cleaning agent with water to a 3% concentration, and then use a pH meter to test the pH. The normal pH range is 9.0 to 11.0.

[0062] (4) Anti-rust performance The test is conducted using the IP287 standard. Dilute the anti-rust metal cleaning agent with water to a 3% concentration by mass. Add 2g of iron filings to 20g of the dilution and mix thoroughly. Pour out the dilution and spread the soaked iron filings evenly on filter paper (within a 1cm x 1cm square). Place the filter paper in a watch glass, seal it with plastic wrap, and place it in an oven at 35°C ± 2°C. After 2 hours, remove the filter paper and assess the area of ​​rust. If there is no rust, the anti-rust performance is considered excellent. If the rust area accounts for less than 0.1% of the filter paper square area, the anti-rust performance is good. If the rust area accounts for 0.1%-1% of the filter paper square area, the anti-rust performance is acceptable. If the rust area accounts for 1%-5% of the filter paper square area, the anti-rust performance is fair. If the rust area accounts for more than 5% of the filter paper square area, the anti-rust performance is unacceptable.

[0063] (5) Cleaning performance test The cleaning ability of a cleaning agent is evaluated by measuring the change in mass of contaminants on an object or surface before and after cleaning. The specific steps are as follows: 1) Ultrasonic cleaning of a standard metal sheet (low carbon steel AISI 1010, size: 50 mm × 50 mm × 1 mm) with acetone or ethanol for 10 minutes to remove surface grease, drying (105°C, 1 hour), cooling to room temperature, and weighing (denoted as W 空白 ); 2) Use a micro syringe to evenly apply 0.1-0.2g of engine oil to the surface of the test piece, let it stand at room temperature for 24 hours (or bake at 80℃ for 1 hour to accelerate curing), and measure the weight of the contaminated test piece (recorded as W 初始 ); 3) Dilute the rust-proof metal cleaning agents of the examples and comparative examples with water to a 5% by mass concentration of the cleaning agent diluent. Heat the solution to 60°C. Place the contaminated test piece in the cleaning agent diluent, ensuring that the cleaning agent diluent covers the standard test piece. Ultrasonic cleaning is then performed (40 kHz, 5 minutes). 4) Take out the test piece and rinse it with deionized water three times to remove the residual cleaning agent, place it in a desiccator to cool to room temperature, and weigh it (recorded as W 清洗后 ), the decontamination rate is calculated according to the following formula:

[0064] The test results are shown in Table 1: Table 1 Test results of the rust-proof metal cleaning agents of Examples 1-3 and Comparative Examples 1-3

[0065] As can be seen from the test results in Table 1, compared with the rust-proof metal cleaning agents of Comparative Examples 1-3, the rust-proof metal cleaning agents of the present invention have excellent cleaning ability and rust prevention performance, and all physical and chemical parameters are within the normal range. The present invention uses a combination of rust-proofing agents, alcoholamines, organic carboxylic acids, and other components, allowing the rust-proof metal cleaning agents to not only clean oil stains from the workpiece surface, but also provide excellent rust prevention for the workpiece.

[0066] The present application has been described in detail above with reference to specific embodiments and exemplary examples. However, these descriptions should not be construed as limiting the present application. Those skilled in the art will appreciate that, without departing from the spirit and scope of the present application, various equivalent substitutions, modifications, or improvements may be made to the technical solutions and implementations of the present application, all of which fall within the scope of the present application. The scope of protection of the present application shall be determined by the appended claims.

Claims

1. A rust-proof metal cleaning agent, characterized in that: The invention is composed of the following components in parts by weight: 10-15 parts of a composite rust preventive agent, 3-6 parts of a rust preventive auxiliary agent, 4-8 parts of an amine compound, 4-8 parts of a cleaning auxiliary agent, 3-6 parts of a surfactant, 4-8 parts of a solubilizer, and 55-70 parts of water; The composite rust preventive agent is composed of alcohol amine and organic acid in a weight ratio of 1: (0.1-0.5); The alcoholamine is one of monoethanolamine or diethanolamine or a combination of the two in any proportion; The organic acid is selected from one or a combination of two or more of undecanedioic acid, decanoic acid, neodecanoic acid, sebacic acid or triazine polycarboxylic acid in any proportion.

2. The rust-proof metal cleaning agent according to claim 1, characterized in that: The organic acid is a composition of undecanedioic acid, sebacic acid and triazine polycarboxylic acid in a mass ratio of 1:1:

1.

3. The rust-proof metal cleaning agent according to claim 1, characterized in that: The anti-rust additive is selected from any one of polycarboxylic acid organic amine, alkyl phosphate, potassium dichromate, sodium molybdate, trisodium phosphate, lauric acid monoethanolamide or benzotriazole.

4. The rust-proof metal cleaning agent according to claim 1, characterized in that: The amine compound is selected from one or a combination of two or more of monoethanolamine, triethanolamine, MDEA or DMEA in any proportion.

5. The rust-proof metal cleaning agent according to claim 1, characterized in that: The cleaning aid is selected from one or a combination of two or more of potassium pyrophosphate, sodium citrate or sodium gluconate in any proportion.

6. The rust-proof metal cleaning agent according to claim 1, characterized in that: The surfactant is selected from one of PSO-100, AEO-7, OP-10 or linear alkylbenzene sulfonate.

7. The rust-proof metal cleaning agent according to any one of claims 1 to 6, characterized in that: The solubilizing agent is selected from one of sodium toluenesulfonate, diethylene glycol monobutyl ether, urea, PEG-400 or 3-aminopropyltriethoxysilane.

8. The method for preparing the rust-proof metal cleaning agent according to any one of claims 1 to 7, characterized in that: Add the composite rust preventive into water, stir and mix evenly, then add the rust preventive agent, amine compound, cleaning agent, surfactant and solubilizer in sequence, stir evenly to obtain the rust preventive metal cleaning agent.

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