Antirust cleaning agent and preparation method thereof

Abstract

The invention discloses an anti-rust cleaning agent which is prepared from the following components in percentage by mass based on the total mass of 100%: 5-15% of an organic acid amide anti-rust agent, 10-15% of organic alkali, 3-8% of fatty alcohol polyoxyethylene polyoxypropylene ether, 2-5% of potassium hydroxide, 2-5% of an ash removal auxiliary agent, 0.1-0.3% of ethylene diamine tetraacetic acid, 1-5% of a solubilizer and the balance of water. And the balance of deionized water. The preparation method of the organic acid amide antirust agent comprises the following steps: mixing dibasic acid and alcohol amine according to a mass ratio of (1.5-2.5): 3, heating to 50-70 DEG C, and reacting for 60-80 minutes to obtain the organic acid amide antirust agent. Compared with an existing steel part cleaning agent, the anti-rust cleaning agent has excellent cleaning capacity and anti-rust performance, is low in residue and free of corrosion, is particularly suitable for cleaning steel parts, does not contain alkali, sodium carbonate, sodium tripolyphosphate, sodium nitrite and the like, and is environmentally friendly.

Description

Technical Field

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

[0002] Steel is one of the most important basic materials in modern society. It has advantages such as high strength, good machinability, and cost-effectiveness, and is widely used in industries such as industry, construction, transportation, and energy. Steel parts can be divided into carbon steel and alloy steel according to their composition. Carbon steel is one of the most widely used materials in industry due to its low cost and high strength. However, its corrosion resistance is not as good as alloy steel, and it is usually necessary to apply anti-rust oil or perform surface treatment (galvanizing, spraying, passivation) to prevent rust. During the processing and transportation of steel parts, stains such as oil, dust, shavings, and hand sweat often form. If these stains are not removed, the subsequent processing of the workpiece will be affected, and corrosion will occur during storage, which affects the processing quality and service life of the product. In severe cases, it may directly lead to scrapping. Therefore, the surface of the steel parts needs to be cleaned and anti-rust treated.

[0003] Traditional steel cleaning requires a step-by-step process, typically: cleaning with a detergent (acid / alkaline cleaning) → water washing → passivation → rust prevention. This process is complex, energy-intensive, and can easily leave corrosive agents on the surface of the steel due to incomplete water washing. Furthermore, to improve the cleaning ability of the detergent, inorganic salts such as flake caustic soda, soda ash, and sodium tripolyphosphate are often added to the detergent formula, which can easily make it difficult to thoroughly rinse the workpiece. Furthermore, after subsequent rust prevention treatment and water rinsing, rust inhibitor residue remains on the workpiece, causing the workpiece surface to turn white and have watermarks after drying, affecting the workpiece's appearance and rust prevention performance. Furthermore, to ensure rust prevention performance, sodium nitrite is often used in detergents in combination with other additives, but sodium nitrite can cause serious environmental pollution.

[0004] Based on this, there is an urgent need to develop an anti-rust cleaning agent suitable for cleaning steel parts, which has excellent cleaning and anti-rust properties, can simplify the cleaning operation of steel parts, and has environmentally friendly ingredients, low residue and no corrosion. Summary of the Invention

[0005] The purpose of the present invention is to solve the deficiencies of the prior art and provide an anti-rust cleaning agent which has excellent cleaning ability and anti-rust performance, is low in residue and non-corrosive, and does not require the use of flake caustic soda, soda ash, sodium tripolyphosphate, sodium nitrite, etc., and is environmentally friendly.

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

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A rust-proof cleaning agent, based on 100% of its total mass, is composed of the following components in percentage by mass: 5-15% of an organic acid amide rust preventive, 10-15% of an organic base, 3-8% of a fatty alcohol polyoxyethylene polyoxypropylene ether, 2-5% of potassium hydroxide, 2-5% of a dust removal aid, 0.1-0.3% of disodium ethylenediaminetetraacetic acid, 1-5% of a solubilizer, and the balance being deionized water;

[0009] The preparation method of the organic acid amide rust inhibitor is as follows: dibasic acid and alcohol amine are mixed in a mass ratio of (1.5-2.5):3, heated to 50-70°C, and reacted for 60-80 minutes to obtain the product;

[0010] Furthermore, the dibasic acid is dodecanedioic acid, and the alcoholamine is a mixture of diethanolamine and triethanolamine in a mass ratio of 1:2.

[0011] Furthermore, the organic base is selected from monoethanolamine, triethanolamine or a combination of the two in any proportion.

[0012] Further, the molecular formula of the fatty alcohol polyoxyethylene ether is RO(CH2CH2O) m (CH2CH3CHO) n H, where R is C 12 ~C 14 wherein m is 3 to 7 and n is 2 to 5.

[0013] Furthermore, the dust removal aid is hydroxyethylidene diphosphate, which reacts with potassium hydroxide to generate potassium salt of hydroxyethylidene diphosphate. The potassium salt of hydroxyethylidene diphosphate forms a water-soluble complex with the metal ions on the workpiece, has an excellent dust removal effect, and has almost no residue compared to sodium salt and potassium salt.

[0014] Furthermore, the solubilizing agent is isomeric decanoic acid, n-octanoic acid or a combination of the two in any proportion.

[0015] The preparation method of the above-mentioned rust-proof cleaning agent is as follows: potassium hydroxide, organic acid amide rust inhibitor, organic base and disodium ethylenediaminetetraacetic acid are added to deionized water in sequence, and after stirring to dissolve, a dust removal agent is added, and after stirring evenly, fatty alcohol polyoxyethylene polyoxypropylene ether is added, and stirred thoroughly. Finally, a solubilizer is added, and stirred and mixed evenly to obtain the product.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] (1) The present invention uses an organic acid amide rust inhibitor as an anti-rust component, which can form a uniform adsorption layer on the surface of the steel workpiece, isolating the workpiece substrate from oxygen and moisture in the air, and effectively protecting the steel workpiece from corrosion; the anti-rust component of the present invention does not contain sodium nitrite, is environmentally friendly, and avoids harm to the health of operators.

[0018] (2) The present invention adopts organic alkali (monoethanolamine, triethanolamine) to provide alkalinity, thereby replacing traditional inorganic salt alkali such as flake caustic soda and potassium pyrophosphate, which can reduce white residue while providing cleaning and oil removal capabilities and improve rust prevention performance.

[0019] (3) The present invention uses hydroxyethylidene diphosphoric acid as a dust removal aid, which reacts with potassium hydroxide to generate a potassium salt of hydroxyethylidene diphosphoric acid. The potassium salt of hydroxyethylidene diphosphoric acid forms a water-soluble complex with the metal ions on the workpiece, and has an excellent dust removal effect. At the same time, compared with sodium salt and potassium salt, there is almost no residue.

[0020] (4) The present invention uses fatty alcohol polyoxyethylene polyoxypropylene ether surfactants to provide oil removal ability. The PO group at the end of the chain is oily, so the foam formed is easier to break, so it has low foaming characteristics and can be used in high-pressure spray cleaning conditions.

[0021] (5) The anti-rust cleaning agent of the present invention combines cleaning and rust prevention into one. After using it to clean steel parts, there is no need to perform anti-rust treatment, which simplifies the cleaning steps of steel parts. DETAILED DESCRIPTION

[0022] The technical solution of the present invention is described clearly and completely below in conjunction with specific embodiments. The following embodiments are provided to further illustrate the present invention, but are not intended to limit the present invention.

[0023] In the following examples, the molecular formula of the fatty alcohol polyoxyethylene polyoxypropylene ether used is: RO(CH2CH2O) m (CH2CH3CHO) n H, where R is C 12 ~C 14 alkyl, m is 5, n is 4; in the embodiment, the preparation method of the organic acid amide rust inhibitor adopted is: dodecane dicarboxylic acid and alcoholamine (a mixture of diethanolamine and triethanolamine with a mass ratio of 1:2) are mixed in a mass ratio of 2:3, heated to 65°C, and reacted for 60min to obtain.

[0024] Example 1

[0025] The invention discloses an anti-rust cleaning agent, which is composed of the following components in percentage by weight based on its total mass: 5% of an organic acid amide rust inhibitor, 14% of an organic base (12% of monoethanolamine and 2% of triethanolamine), 4% of fatty alcohol polyoxyethylene polyoxypropylene ether, 3.5% of potassium hydroxide, 4% of a dust removal aid (hydroxyethylidene diphosphonic acid, content 90%), 0.2% of disodium ethylenediaminetetraacetic acid, 2.4% of a solubilizer (isomeric decanoic acid), and 66.9% of deionized water.

[0026] The preparation method of the above-mentioned anti-rust cleaning agent is as follows: potassium hydroxide, organic acid amide rust inhibitor, monoethanolamine, triethanolamine and disodium ethylenediaminetetraacetic acid are added to deionized water in sequence, and after stirring to dissolve, hydroxyethylidene diphosphoric acid is added in small amounts and multiple times, and after stirring evenly, fatty alcohol polyoxyethylene polyoxypropylene ether is added and stirred thoroughly, and finally isomeric decanoic acid is added and stirred to mix evenly to obtain a reddish-brown transparent liquid, which is the anti-rust cleaning agent.

[0027] Example 2

[0028] The invention discloses an anti-rust cleaning agent, which is composed of the following components in percentage by weight based on its total mass: 8% of an organic acid amide rust inhibitor, 14% of an organic base (12% of monoethanolamine and 2% of triethanolamine), 6% of fatty alcohol polyoxyethylene polyoxypropylene ether, 2.5% of potassium hydroxide, 3% of a dust removal aid (hydroxyethylidene diphosphonic acid, content 90%), 0.2% of disodium ethylenediaminetetraacetic acid, 2.8% of a solubilizer (isomeric decanoic acid), and 63.5% of deionized water.

[0029] The preparation method of the above-mentioned anti-rust cleaning agent is as follows: potassium hydroxide, organic acid amide rust inhibitor, monoethanolamine, triethanolamine and disodium ethylenediaminetetraacetic acid are added to deionized water in sequence, and after stirring to dissolve, hydroxyethylidene diphosphoric acid is added in small amounts and multiple times, and after stirring evenly, fatty alcohol polyoxyethylene polyoxypropylene ether is added and stirred thoroughly, and finally isomeric decanoic acid is added and stirred to mix evenly to obtain a reddish-brown transparent liquid, which is the anti-rust cleaning agent.

[0030] Example 3

[0031] The invention discloses an anti-rust cleaning agent, which is composed of the following components in percentage by weight based on its total mass: 12% of an organic acid amide rust inhibitor, 14% of an organic base (2% of monoethanolamine and 12% of triethanolamine), 4% of fatty alcohol polyoxyethylene polyoxypropylene ether, 2.5% of potassium hydroxide, 3% of a dust removal aid (hydroxyethylidene diphosphonic acid, content 90%), 0.2% of disodium ethylenediaminetetraacetic acid, 2.6% of a solubilizer (isomeric decanoic acid), and 61.7% of deionized water.

[0032] The preparation method of the above-mentioned anti-rust cleaning agent is as follows: potassium hydroxide, organic acid amide rust inhibitor, monoethanolamine, triethanolamine and disodium ethylenediaminetetraacetic acid are added to deionized water in sequence, and after stirring to dissolve, hydroxyethylidene diphosphoric acid is added in small amounts and multiple times, and after stirring evenly, fatty alcohol polyoxyethylene polyoxypropylene ether is added and stirred thoroughly, and finally isomeric decanoic acid is added and stirred to mix evenly to obtain a reddish-brown transparent liquid, which is the anti-rust cleaning agent.

[0033] Example 4

[0034] The invention discloses an anti-rust cleaning agent, which is composed of the following components in percentage by weight based on its total mass: 10% of an organic acid amide rust inhibitor, 14% of an organic base (12% of monoethanolamine and 2% of triethanolamine), 4% of fatty alcohol polyoxyethylene polyoxypropylene ether, 3.5% of potassium hydroxide, 4% of a dust removal aid (hydroxyethylidene diphosphonic acid, content 90%), 0.2% of disodium ethylenediaminetetraacetic acid, 3.2% of a solubilizer (isomeric decanoic acid), and 61.1% of deionized water.

[0035] The preparation method of the above-mentioned anti-rust cleaning agent is as follows: potassium hydroxide, organic acid amide rust inhibitor, monoethanolamine, triethanolamine and disodium ethylenediaminetetraacetic acid are added to deionized water in sequence, and after stirring to dissolve, hydroxyethylidene diphosphoric acid is added in small amounts and multiple times, and after stirring evenly, fatty alcohol polyoxyethylene polyoxypropylene ether is added and stirred thoroughly, and finally isomeric decanoic acid is added and stirred to mix evenly to obtain a reddish-brown transparent liquid, which is the anti-rust cleaning agent.

[0036] Comparative Example 1

[0037] The invention discloses an anti-rust cleaning agent, which is composed of the following components in percentage by weight based on its total weight: 2% of sodium metasilicate pentahydrate, 3% of polytricarboxylic acid ester corrosion inhibitor H5768, 4% of carboxylic acid amine rust inhibitor (Clariant), 6% of fatty alcohol polyether LF-901 (BASF), 2% of polyacrylic acid, and 83% of deionized water.

[0038] The preparation method of the above-mentioned anti-rust cleaning agent is as follows: sodium metasilicate pentahydrate, polytricarboxylic acid ester corrosion inhibitor H5768, and carboxylic acid amine rust inhibitor are added to deionized water in sequence, stirred to dissolve, then polyacrylic acid is added and stirred evenly, and finally fatty alcohol polyether LF901 is added and stirred thoroughly to obtain a reddish-brown transparent liquid, which is the anti-rust cleaning agent.

[0039] 1. The anti-rust cleaning agents prepared in Examples 1-4 and Comparative Example 1 were tested for their oil and dust removal performance.

[0040] (1) Ultrasonic cleaning

[0041] Test method: Dilute the anti-rust cleaning agent with water to form a working solution according to the mass ratio of anti-rust cleaning agent: water = 1:19, transfer 4kg of the working solution to an ultrasonic instrument, heat it to 50℃ and set it aside. The ultrasonic parameters are set as follows: temperature: 50℃, ultrasonic frequency: 28kHz, cleaning time: 2min. Add the processed but uncleaned steel bearings with oil and dust (bearing specifications: outer diameter 14*inner diameter 5*width 5 (mm)) into the working solution, clean it according to the established process, rinse it with water after cleaning, and then observe the oil and dust removal on the surface of the steel bearing. Among them, the oil removal condition is characterized by the oil removal rate, and the oil removal rate is determined by the spread of the water film on the surface of the steel bearing. The calculation formula is:

[0042] Oil removal rate = (area of water film spread on the steel bearing surface after rinsing / total area of steel bearing surface) * 100%.

[0043] The dust removal condition can be judged by wiping the surface of the workpiece with qualitative filter paper and observing whether the surface of the filter paper turns gray or black.

[0044] The test results are shown in Table 1:

[0045] Table 1 Degreasing and dusting test results of the rust-proof cleaning agents of Examples 1-4 and Comparative Example 1 under ultrasonic cleaning

[0046]

[0047] (2) Spray cleaning

[0048] Test method: Dilute the anti-rust cleaning agent with water to form a working solution at a mass ratio of 1:19. Place the working solution in a spray machine (model JH-1000XP) and heat it to 50°C for later use. Fix the processed but uncleaned steel bearing (bearing specifications: outer diameter 14*inner diameter 5*width 5 (mm)) with oil and dust in the spray machine and spray clean it for 2 minutes (spray pressure is 0.6MPa, and the cleaning solution is circulated). After the spray cleansing, take out the steel bearing and rinse it with running tap water. Then observe the degreasing and de-dusting of the steel bearing surface. The degreasing condition is characterized by the degreasing rate, which is determined by the spreading of the water film on the steel bearing surface. The calculation formula is:

[0049] Oil removal rate = (area of water film spread on the steel bearing surface after rinsing / total area of steel bearing surface) * 100%.

[0050] The dust removal condition can be judged by wiping the surface of the workpiece with qualitative filter paper and observing whether the surface of the filter paper turns gray or black.

[0051] The test results are shown in Table 2:

[0052] Table 2 Degreasing and dusting test results of the anti-rust cleaning agents of Examples 1-4 and Comparative Example 1 under spray cleaning

[0053]

[0054] It can be seen from the test results in Table 1 and Table 2 that, whether ultrasonic cleaning or spray cleaning, the rust-proof cleaning agents of Examples 1-4 of the present invention have better degreasing and deashing effects on steel bearings than the rust-proof cleaning agent of Comparative Example 1.

[0055] 2. The anti-rust cleaning agents prepared in Examples 1-4 and Comparative Example 1 were tested for their anti-rust performance.

[0056] Test method: Dilute the anti-rust cleaning agent with water to make a working solution according to the mass ratio of anti-rust cleaning agent: water = 1:19, take several No. 45 steel sheets with a specification of 50mm*25mm*2mm, and manually polish both sides of the steel sheets to make the surface of the steel sheets uniform and flat. Place the polished steel sheets in anhydrous ethanol for cleaning and quickly dry them with a hair dryer, then place the steel sheets in the diluted working solution and soak them completely. Take out the steel sheets after 10 minutes and let them dry naturally. Then observe the time when large areas of rust begin to appear on the steel sheets regularly every day for 15 days. The whole process is carried out at room temperature.

[0057] The test results are shown in Table 3:

[0058] Table 3 Anti-rust performance test results of the anti-rust cleaning agents of Examples 1-4 and Comparative Example 1

[0059]

[0060] It can be seen from the test results in Table 3 that, compared with the rust-proof cleaning agent of Comparative Example 1, the rust-proof cleaning agents of Examples 1 to 4 of the present invention have better rust-proof performance on steel parts.

[0061] 3. The rust-proof cleaning agents prepared in Examples 1-4 and Comparative Example 1 were subjected to a residual test.

[0062] Test method: Dilute the anti-rust cleaning agent with water to make a working solution according to the mass ratio of anti-rust cleaning agent: water = 1:19. Take several 304 stainless steel sheets with a specification of 50mm*50mm and a roughness of 50±25nm. Clean the stainless steel sheets with pure water, blow them dry, and then immerse them completely in the working solution. Take them out after 2 minutes and let them dry naturally. Observe the residue on the surface of the stainless steel sheets.

[0063] The test results are shown in Table 4:

[0064] Table 4 Test results of the residual condition of the anti-rust cleaning agent of Examples 1-4 and Comparative Example 1

[0065]

[0066] It can be seen from the test results in Table 4 that after washing with the anti-rust cleaning agent of the embodiment of the present invention, there is no white residue on the workpiece, only a small amount of watermark, and the workpiece is dry and not sticky.

Claims

1. A rust-proof cleaning agent, characterized in that: Taking its total mass as 100%, it is composed of the following components in percentage by mass: 5-15% of an organic acid amide rust inhibitor, 10-15% of an organic base, 3-8% of a fatty alcohol polyoxyethylene polyoxypropylene ether, 2-5% of potassium hydroxide, 2-5% of a dust removal aid, 0.1-0.3% of disodium ethylenediaminetetraacetic acid, 1-5% of a solubilizer, and the balance being deionized water; The preparation method of the organic acid amide rust inhibitor is as follows: dibasic acid and alcohol amine are mixed in a mass ratio of (1.5-2.5):3, heated to 50-70° C., and reacted for 60-80 minutes to obtain the organic acid amide rust inhibitor.

2. The rust-proof cleaning agent according to claim 1, characterized in that The dibasic acid is dodecanedioic acid, and the alcoholamine is a mixture of diethanolamine and triethanolamine in a mass ratio of 1:

2.

3. The rust-proof cleaning agent according to claim 1, characterized in that The organic base is selected from monoethanolamine, triethanolamine or a combination of the two in any proportion.

4. The rust-proof cleaning agent according to claim 1, characterized in that The molecular formula of the fatty alcohol polyoxyethylene ether is RO(CH2CH2O) m (CH2CH3CHO) n H, where R is C 12 ~C 14 wherein m is 3 to 7 and n is 2 to 5.

5. The rust-proof cleaning agent according to claim 1, characterized in that The dust removal auxiliary agent is hydroxyethylidene diphosphonic acid.

6. The rust-proof cleaning agent according to any one of claims 1 to 5, characterized in that: The solubilizing agent is isomeric decanoic acid, n-octanoic acid or a combination of the two in any proportion.

7. The method for preparing the anti-rust cleaning agent according to any one of claims 1 to 6, characterized in that: Add potassium hydroxide, organic acid amide rust inhibitor, organic base and disodium ethylenediaminetetraacetic acid to deionized water in sequence, stir to dissolve, then add dust removal aid, stir evenly, add fatty alcohol polyoxyethylene polyoxypropylene ether, stir thoroughly, and finally add solubilizer, stir and mix evenly to obtain the product.

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