Environment-friendly low-foam cleaning agent for spraying and cleaning low-carbon steel

Abstract

The invention belongs to the field of cleaning agents, and particularly relates to an environment-friendly low-foam cleaning agent for spraying and cleaning low-carbon steel. The invention discloses an environment-friendly low-foam cleaning agent for spraying and cleaning low-carbon steel. The cleaning agent is prepared from the following components in percentage by mass: 4.79%-6.62% of a surfactant, 15.1%-22.4% of a corrosion inhibitor, 1.8%-2.5% of a pH regulator and the balance of water. According to the invention, a plurality of nonionic surface active compounds are adopted to obviously reduce the interfacial tension so as to quickly remove oil; under the cooperation of a spraying cleaning machine, oil stains on workpieces can be quickly cleaned without residues, and the cleaning agent does not contain heavy metals, nitrite, phosphate and other harmful substances. No volatile pungent smell exists; and the prepared environment-friendly low-foam cleaning agent for spraying and cleaning the low-carbon steel is stable in finished product, is suitable for cleaning cast iron, steel and plastic parts, and has a good application prospect.

Description

Technical Field

[0001] The invention belongs to the field of cleaning agents, and in particular relates to an environmentally friendly low-foam cleaning agent for spray cleaning of low-carbon steel. Background Art

[0002] During metal processing, lubricating oil, cutting fluid and other oil stains often adhere to the surface of low carbon steel. These oil stains not only affect the appearance of low carbon steel, but also affect the quality and efficiency of subsequent processing procedures. Cleaning agents can effectively remove these oil stains, ensure the cleanliness of the surface of low carbon steel, and provide a good foundation for subsequent processes such as painting and welding.

[0003] Existing low carbon steel cleaning agents are mainly divided into metal water-based cleaning agents, water-based cleaning agents with strong acids and alkalis as the main ingredients, water-based cleaning agents with surfactants as the main ingredients, phosphate-type metal cleaning agents and hydrocarbon cleaning agents.

[0004] Water-based metal cleaning agents use water as a carrier and are formulated with surfactants and a variety of additives such as cleaning aids, rust inhibitors, corrosion inhibitors, defoamers, and fungicides. At present, water-based metal cleaning agents generally have the following problems: unstable products, easy stratification, insufficient cleaning ability, strong odor, a certain degree of rust on ferrous metals, discoloration of non-ferrous metals, and affect the quality and appearance of workpieces.

[0005] The disadvantage of water-based cleaning agents with strong acids and alkalis as the main components is that they use chemical reactions to form films, which affects the accuracy of the workpiece, is harmful to human health and the environment, and has high costs for treating the cleaning waste liquid.

[0006] Water-based cleaning agents with surfactants as the main component can effectively remove oil stains, but the ferrous metal workpieces after cleaning still have rust problems, which manifest as rust spots or rust stains.

[0007] Phosphates are mainly used as water softeners in metal cleaners, but they are the main cause of eutrophication (lack of oxygen) in water.

[0008] Hydrocarbon cleaning agents have a strong odor, are flammable, have limited drying speed, and have a low flash point. Attention should be paid to ventilation, fire prevention, and explosion prevention measures for cleaning equipment and surrounding areas. Anti-static measures are required if ultrasonic equipment is used. Prolonged contact with the skin can cause excessive degreasing.

[0009] Based on the above problems existing in the existing low carbon steel cleaning agents, there is an urgent need to develop an environmentally friendly low carbon steel cleaning agent with good cleaning effect, stable finished product, and good temporary anti-rust effect. It should also be safe to use, phosphate-free, and free of rust after cleaning. Summary of the invention

[0010] Based on the above technical problems, the present invention has developed an environmentally friendly low-foam cleaning agent for spray cleaning of low-carbon steel after a large amount of literature research, a large amount of component screening, and formula optimization test experiments. The environmentally friendly low-foam cleaning agent for spray cleaning of low-carbon steel has excellent cleaning effect, temporary anti-rust effect, is safe and environmentally friendly to use, does not contain phosphate, and does not rust after cleaning.

[0011] Specifically, the present invention provides an environmentally friendly low-foam cleaning agent for spray cleaning of low-carbon steel, which is composed of 4.79%-6.62% of a surfactant, 15.1%-22.4% of a corrosion inhibitor, 1.8%-2.5% of a pH regulator, and the remainder is water in mass percentage.

[0012] Furthermore, in the environmentally friendly low-foam cleaning agent for spray cleaning of low-carbon steel, the surfactant is composed of 0.84%-1.27% of non-ionic surfactant, 3.6%-4.3% of non-ionic surfactant and 0.35%-1.05% of low-foam surfactant in terms of mass percentage.

[0013] Furthermore, in the environmentally friendly low-foam cleaning agent for spray cleaning of low-carbon steel, the corrosion inhibitor is composed of 0.05%-0.2% of benzotriazole, 0.05%-0.2% of IRGACOR L 190plus and 15%-22% of triethanolamine in terms of mass percentage.

[0014] Furthermore, in the environmentally friendly low-foam cleaning agent for spray cleaning of low-carbon steel, the corrosion inhibitors benzotriazole and IRGACOR L 190plus also have an anti-rust effect.

[0015] 5. The environmentally friendly low-foam cleaning agent for spray cleaning of low-carbon steel according to claim 1, characterized in that the pH regulator is an organic acid.

[0016] Furthermore, in the environmentally friendly low-foam cleaning agent for spray cleaning of low-carbon steel, the organic acid also has a solubilizing effect.

[0017] Furthermore, in the environmentally friendly low-foam cleaning agent for spray cleaning of low-carbon steel, the triethanolamine also has an emulsifying effect in an alkaline environment.

[0018] On the other hand, the present invention provides a method for preparing an environmentally friendly low-foam cleaning agent for spray cleaning of low-carbon steel, the method for preparing an environmentally friendly low-foam cleaning agent for spray cleaning of low-carbon steel comprising the following steps:

[0019] Step 1: weigh the raw materials of various components of the environmentally friendly low-foam cleaning agent for spray cleaning of low-carbon steel according to mass percentage and set aside.

[0020] Step 2: Add water, triethanolamine and IRGACOR L 190plus into a container and stir at a low speed to dissolve. Step 3: Add benzotriazole to the solution prepared in step 2, continue stirring, add surfactant and remaining raw materials, stir at a low speed until it becomes a transparent and uniform liquid, and obtain an environmentally friendly low-foaming cleaning agent for spray cleaning of low-carbon steel.

[0021] In addition, the present invention also provides the use of the environmentally friendly low-foam cleaning agent for spray cleaning low-carbon steel in cleaning cast iron, steel and plastic parts.

[0022] Compared with the prior art, the present invention has at least the following advantages or beneficial effects:

[0023] The environmentally friendly low-foam cleaning agent for spray cleaning of low-carbon steel provided by the invention has excellent cleaning effect and temporary anti-rust effect, is safe to use, does not contain phosphates, and does not rust after cleaning. In addition, the present invention adopts a combination of multiple non-ionic surfactants to significantly reduce interfacial tension and thus quickly remove oil; with the cooperation of a spray cleaning machine, the oil stains on the workpiece can be quickly cleaned without residue, and does not contain heavy metals, nitrites, phosphates and other harmful substances. There is no volatile irritating odor; no defoaming agent needs to be added, and the prepared environmentally friendly low-foam cleaning agent for spray cleaning of low-carbon steel is stable and suitable for cleaning cast iron, steel and plastic parts. DETAILED DESCRIPTION

[0024] The technical solution of the present invention is described below in conjunction with embodiments; however, the present invention is not limited to the following embodiments.

[0025] The experimental methods and detection methods in the following embodiments are all conventional methods unless otherwise specified; the raw materials and materials are all commercially available unless otherwise specified; the index data are all conventional measurement methods unless otherwise specified.

[0026] Example 1

[0027] This embodiment is to prepare an environmentally friendly low-foam cleaning agent for spray cleaning of low-carbon steel.

[0028] Weigh, by mass percentage, 0.84% ​​of LKD FK916 nonionic surfactant, 3.6% of LKD 775 alkaline surfactant, 0.35% of Clariant Genapol EP 0244 low-foaming surfactant, 0.05% of benzotriazole, 0.05% of BASFIRGACOR L 190plus, 15% of triethanolamine, 1.8% of LKD YR4 organic acid from Shanghai Lingjie New Material Technology Co., Ltd., and the balance of water for later use.

[0029] Add the water, triethanolamine and IRGACOR L 190plus weighed above into the container and stir at low speed to obtain a solution. Then add benzotriazole to the obtained solution, continue stirring, add surfactant and remaining raw materials, stir at low speed until it becomes a transparent and uniform liquid, and obtain an environmentally friendly low-foam cleaning agent for spray cleaning of low-carbon steel. Mark it as 1# environmentally friendly low-foam cleaning agent for spray cleaning of low-carbon steel for standby use.

[0030] Triethanolamine assists in rust prevention, has emulsification function in alkaline environment, and is inexpensive; surfactants have good cleaning ability, and the modified special structure non-ionic surfactants have extremely low foaming. No defoamer is required for low-pressure spray degreasing and cleaning; benzotriazole forms a multi-layer protective film on the copper surface, which prevents the copper surface from undergoing redox reactions and plays an anti-corrosion role. It can be combined with a variety of corrosion inhibitors to improve the corrosion inhibition effect. IRGACOR L 190plus has good biodegradability, is compatible with hard water, and has an extremely low foaming tendency. Organic acids are less corrosive and rely on chelation at high temperatures to enhance the descaling ability.

[0031] Example 2

[0032] This embodiment is to prepare an environmentally friendly low-foam cleaning agent for spray cleaning of low-carbon steel.

[0033] Weigh, by mass percentage, 0.95% of LKD FK916 nonionic surfactant, 4.0% of LKD 775 alkaline surfactant, 0.5% of Clariant Genapol EP 0244 low-foaming surfactant, 0.1% of benzotriazole, 0.15% of BASFIRGACOR L 190plus, 25% of triethanolamine, 2.0% of LKD YR4 organic acid (Shanghai Lingjie New Material Technology Co., Ltd.), and the balance of water for later use.

[0034] Add the water, triethanolamine and IRGACOR L 190plus weighed above into a container and stir at low speed to dissolve to obtain a solution. Then add benzotriazole to the obtained solution, continue stirring, add surfactant and remaining raw materials, stir at low speed until it becomes a transparent and uniform liquid, and obtain an environmentally friendly low-foam cleaning agent for spray cleaning of low-carbon steel. Mark it as 2# environmentally friendly low-foam cleaning agent for spray cleaning of low-carbon steel for use.

[0035] Example 3

[0036] This embodiment is to prepare an environmentally friendly low-foam cleaning agent for spray cleaning of low-carbon steel.

[0037] Weigh, by mass percentage, 1.27% of LKD FK916 nonionic surfactant, 4.3% of LKD 775 alkaline surfactant, 1.05% of Clariant Genapol EP 0244 low-foaming surfactant, 0.2% of benzotriazole, 0.2% of BASFIRGACOR L 190plus, 22% of triethanolamine, 2.5% of LKD YR4 organic acid (Shanghai Lingjie New Material Technology Co., Ltd.), and the balance of water for later use.

[0038] Add the water, triethanolamine and IRGACOR L 190plus weighed above into a container and stir at low speed to dissolve to obtain a solution. Then add benzotriazole to the obtained solution, continue stirring, add surfactant and remaining raw materials, stir at low speed until it becomes a transparent and uniform liquid, and obtain an environmentally friendly low-foam cleaning agent for spray cleaning of low-carbon steel. Mark it as 3# environmentally friendly low-foam cleaning agent for spray cleaning of low-carbon steel for standby use.

[0039] Example 4

[0040] This embodiment is a performance test experiment of an environmentally friendly low-foam cleaning agent for spray cleaning of low-carbon steel.

[0041] This embodiment uses the environmentally friendly low-foam cleaning agents 1#-3# prepared in Examples 1 to 3 for spray cleaning of low-carbon steel as the test group, and the comparison agent is the ES-521 cleaning agent purchased from Heze Haichuang Cleaning Materials Co., Ltd.

[0042] Dilute the environmentally friendly low-foam cleaning agent for spray cleaning of low-carbon steel 1#-3# with pure water at a volume ratio of 1:14, and dilute the contrast agent with pure water at a volume ratio of 1:14. Refer to JB / T 4323.1-1999 water-based metal cleaning agent test method, pressure 5 bar, 50℃ for 5 minutes, and clean and rinse twice each.

[0043] The test results show that the environmentally friendly low-foam cleaning agent for spray cleaning of low-carbon steel 1#-3# has a good cleaning effect. The surface of the workpiece is smooth and does not change color. The workpiece is bright and rust-free. The foam in the tank is low during the cleaning process. The cleanliness test of the workpiece after drying refers to the "United Power Cleanliness Test Specification" VDA19.1 and passed. 1# scheme takes 5 pieces to test the cleanliness, the filter membrane is 5um, and the weight of impurities in a single piece is ≤0.15mg to pass

[0044] Laboratory Parts Cleanliness Test Report

[0045] project 1# Weight of blank filter membrane before filtration G1_1 (g) 40.20268 Weight of blank filter membrane after filtration G1_2 (g) 40.20282 Blank pollutant weight G1 = G1_1-G1_2 (mg) 0.14 Membrane weight before filtration G2_1 (g) 40.31310 Filter membrane weight after filtration G2_2 (g) 40.31385 Total weight of pollutants after filtration G2 = G2_2-G2_1 (mg) 0.75 Total weight of pollutants on parts G = G2-G1 (mg) 0.61 Weight of impurities per piece (mg) 0.122

[0046] After cleaning with the comparative agent ES-521, the surface of the workpiece did not change color, there were uniform rust spots, and there was a lot of foam in the liquid tank during the cleaning process.

[0047] The cleaning agent stability is set at room temperature and high and low temperature stability. The prepared cleaning agent is placed at room temperature (25°C), high and low temperature (50°C and 5°C) to observe whether there is turbidity, stratification or precipitation.

[0048] For rust resistance, refer to JB / T 9189-2016 Water-based Material Anti-Rust Test Method. Dilute the cleaning agent 20 times with tap water to do a cast iron chips immersion test (room temperature for 4h) to observe whether there are rust spots.

[0049] The test results of stability, pH value and anti-rust performance of different cleaning agents are shown in Tables 1 to 4.

[0050] Table 1.1 Test results of environmentally friendly low-foaming cleaning agent for spray cleaning of low-carbon steel

[0051]

[0052] Table 2.2# Test results of environmentally friendly low-foam cleaning agent for spray cleaning of low-carbon steel

[0053]

[0054]

[0055] Table 3.3# Test results of environmentally friendly low-foam cleaning agent for spray cleaning of low-carbon steel

[0056] Test date pH Room temperature stability Rust resistance High and low temperature stability 2023.12.19 8.60 Stablize Level 0 Stablize 2024.1.18 8.63 Stablize Level 0 Stablize 2024.2.19 8..66 Stablize Level 0 Stablize 2024.3.18 8.60 Stablize Level 0 Stablize 2024.4.17 8.61 Stablize Level 0 Stablize 2024.5.17 8.61 Stablize Level 0 Stablize 2024.6.17 8.62 Stablize Level 0 Stablize 2024.7.16 8.66 Stablize Level 0 Stablize 2024.8.15 8.61 Stablize Level 0 Stablize 2024.9.16 8.64 Stablize Level 0 Stablize 2024.10.16 8.63 Stablize Level 0 Stablize 2024.11.15 8.68 Stablize Level 0 Stablize 2024.12.16 8.68 Stablize Level 0 Stablize

[0057] Table 4. Comparative agent ES-521 cleaning agent test results

[0058]

[0059]

[0060] The results in Tables 1 to 4 show that the pH value of the environmentally friendly low-foam cleaning agent for spray cleaning of low-carbon steel 1#-3# is in the range of 8.5-8.7, and the stability is good at room temperature, low temperature and high temperature, without precipitation and stratification, and the anti-rust performance is all level 0, with excellent anti-rust performance. The comparative agent ES-521 cleaning agent is severely rusted, with rust on more than 5% of the filter paper area.

[0061] In summary, this embodiment shows that the environmentally friendly low-foam cleaning agent for spray cleaning of low-carbon steel 1#-3# provided by the present invention has good stability under normal temperature and high and low temperature environments, and has a good cleaning effect. The surface of the workpiece is smooth and does not change color. The workpiece is bright and rust-free. The foam control during the cleaning process is good, which is better than the comparative agent ES-521 cleaning agent.

Claims

1. An environmentally friendly low-foam cleaning agent for spray cleaning of low-carbon steel, characterized in that: The environmentally friendly low-foam cleaning agent for spray cleaning low-carbon steel is composed of 4.79%-6.62% of a surfactant, 15.1%-22.4% of a corrosion inhibitor, 1.8%-2.5% of a pH regulator, and the remainder is water in terms of mass percentage.

2. The environmentally friendly low-foam cleaning agent for spray cleaning of low-carbon steel according to claim 1 is characterized in that: The surfactant consists of 0.84%-1.27% of non-ionic surfactant, 3.6%-4.3% of non-ionic surfactant and 0.35%-1.05% of low-foaming surfactant in terms of mass percentage.

3. The environmentally friendly low-foam cleaning agent for spray cleaning of low-carbon steel according to claim 1, characterized in that: The corrosion inhibitor consists of 0.05%-0.2% of benzotriazole, 0.05%-0.2% of IRGACOR L 190plus and 15%-22% of triethanolamine in terms of mass percentage.

4. The environmentally friendly low-foam cleaning agent for spray cleaning of low-carbon steel according to claim 3 is characterized in that: The corrosion inhibitors benzotriazole and IRGACOR L 190plus also have an anti-rust effect.

5. The environmentally friendly low-foam cleaning agent for spray cleaning of low-carbon steel according to claim 1, characterized in that: The pH regulator is an organic acid.

6. The environmentally friendly low-foam cleaning agent for spray cleaning of low-carbon steel according to claim 5, characterized in that: The organic acid also has a solubilizing effect.

7. The environmentally friendly low-foam cleaning agent for spray cleaning of low-carbon steel according to claim 3, characterized in that: The triethanolamine also has an emulsifying effect in an alkaline environment.

8. The method for preparing the environmentally friendly low-foam cleaning agent for spray cleaning of low-carbon steel according to claims 1-6, characterized in that: The steps include: Step 1: weigh the raw materials of various components of the environmentally friendly low-foam cleaning agent for spray cleaning of low-carbon steel according to mass percentage and set aside. Step 2: Add water, triethanolamine and IRGACOR L 190plus into a container and stir at low speed to dissolve. Step 3: Add benzotriazole to the solution obtained in step 2, add surfactant and remaining raw materials after continuous stirring, and stir evenly at a low speed until a transparent and uniform liquid is obtained to obtain an environmentally friendly low-foaming cleaning agent for spray cleaning of low-carbon steel.

9. Use of the environmentally friendly low-foam cleaning agent for spray cleaning of low-carbon steel as described in claims 1-7 in cleaning of cast iron, steel and plastic parts.

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