A green solvent-free water-based special cleaning agent for cold-rolled steel plates and its preparation method

Abstract

The present invention discloses a green, solvent-free, water-based, special cleaning agent for cold-rolled steel sheets and a preparation method thereof, belonging to the field of industrial cleaning technology. The cleaning agent comprises the following raw materials by weight: 0.4-1.0% green plant-based chelating agent, 5-12% green emulsifier, 2-3% penetrant, 0.05-0.2% rust inhibitor, and the balance is water. The cleaning agent prepared by the present invention has the characteristics of being green, low-foaming, highly alkali-resistant, and highly efficient in decontamination and rust prevention. It can be used as a cleaning agent for cleaning processes such as spraying and scrubbing.

Description

Technical Field

[0001] The invention belongs to the technical field of industrial cleaning, and in particular relates to a green solvent-free water-based special cleaning agent for cold-rolled steel plates and a preparation method thereof. Background Art

[0002] Steel is currently the most widely used alloy material. Cleaning after cold rolling is an essential step in its production process and a major factor influencing the quality of subsequent products. Dirt adhering to the surface of steel plates primarily includes rolling oil, anti-rust oil, and other oils, as well as rust. Industrial cleaning of steel plates is relatively fast, requiring only a short dwell time in the wash tank (approximately 1-6 seconds), making excellent cleaning performance a must for any cleaning agent.

[0003] Currently, commonly used metal cleaning agents include solvent-based cleaning agents, alkaline cleaning agents, and water-based metal cleaning agents. Although solvent-based cleaning agents can effectively remove and disperse oil stains on metal surfaces, most of them are flammable and volatile. In practice, they are very harmful to the human body and the environment and can cause metal to rust. Alkaline cleaning agents remove grease and oil stains on metal surfaces through saponification reactions under strong alkaline conditions. They have poor decontamination capabilities and are usually used for cleaning light oil stains. Water-based metal cleaning agents mainly use surfactants as solutes and add a certain amount of additives. They use the wetting, emulsification, penetration, and dispersion properties of surfactants to remove oil stains. They are the mainstream direction of the metal cleaning industry.

[0004] Alkylphenol polyoxyethylene, a surfactant commonly used in industry, has excellent detergency and emulsification properties, but its biodegradability is poor. Some countries and regions have begun to restrict its usage, so the use of green and safe surfactants is the only way for industrial cleaning. Summary of the Invention

[0005] In response to the problems existing in the above-mentioned prior art, the present invention provides a green solvent-free water-based special cleaning agent for cold-rolled steel plates and a preparation method thereof, which mainly uses natural, green surfactants and chelating agents as main raw materials. The cleaning agent product can be used for cleaning under process conditions such as spraying and brushing.

[0006] To achieve the above objectives, the present invention proposes the following technical solutions:

[0007] A green solvent-free water-based special cleaning agent for cold-rolled steel plates comprises the following raw materials in percentage by mass: 0.4-1.0% of a green plant-based chelating agent, 5-12% of a green emulsifier, 2-3% of a penetrant, 0.05-0.2% of a rust preventive, and the balance being water.

[0008] Furthermore, the green plant-based chelating agent is a mixture of carboxymethyl cellulose and other chelating agents, wherein the mass ratio of carboxymethyl cellulose to other chelating agents is (0.3-0.8):(0.1-0.2).

[0009] Furthermore, the other chelating agents are one or more of sodium gluconate, aminotriacetic acid and ethylenediaminetetraacetic acid.

[0010] Furthermore, the green emulsifier is one or more of alkyl glycoside surfactants, alkyl xyloside surfactants, chlorohydrin ether carboxylate surfactants and modified oil ethoxylates.

[0011] Furthermore, the mass ratio of the alkyl glycoside surfactant, the alkyl xyloside surfactant, the chlorohydrin ether carboxylate surfactant, and the modified oil ethoxylate is (1-3):(2-4):(1-3):(1-2).

[0012] Furthermore, the alkyl glycoside surfactant is one or more of APG08, APG10, APG12, APG0810 and APG1214.

[0013] The alkyl xyloside surfactant is C 10 -AX、C8-AX、C 810 -AX and one or more of octyldodecanol xyloside.

[0014] The chlorohydrin ether carboxylate surfactant is one or two of AEC-6H, AEC-7H, AEC-8H and AEC-9H.

[0015] The modified oil ethoxylate is one or two of SOE-N-60, SOE-C-60, FMEE and SNS-80.

[0016] Furthermore, the penetrant is one or more of JFC, OEP-70, AEP-98, fast penetrant T and low-foaming penetrant SF.

[0017] Furthermore, the rust inhibitor is one or more of monoethanolamine, diethanolamine and triethanolamine.

[0018] The present invention also provides a preparation method of a green solvent-free water-based special cleaning agent for cold-rolled steel plates. The raw materials are weighed according to mass, and a green plant-based chelating agent, a green emulsifier penetrant and a rust inhibitor are added to water in sequence and stirred to obtain a green solvent-free water-based special cleaning agent for cold-rolled steel plates.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present invention uses a green surfactant, enabling the prepared cleaning agent to effectively remove dirt such as cold rolling oil and rust-proof oil. The addition of the rust-proof agent and chelating agent not only chelates calcium and magnesium ions, improving cleaning performance and effectively protecting the metal surface from oxidation, but also effectively disperses dirt and prevents redeposition. Furthermore, the cleaning agent prepared by the present invention does not contain an added solvent, resulting in low foaming and easy rinsing. The raw materials used are all biodegradable materials, making it a green, efficient, and safe cleaning agent specifically for steel.

[0021] The cleaning agent prepared by the invention has the characteristics of being green, low-foaming, and highly effective in decontamination and rust prevention, and can be used as a cleaning agent in cleaning processes such as spraying and scrubbing. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings, which constitute part of this application, are intended to provide a further understanding of this application. The exemplary embodiments and descriptions of this application are intended to explain this application and do not constitute an improper limitation on this application. In the accompanying drawings:

[0023] Figure 1 The results of hand rubbing before and after washing the steel plate. DETAILED DESCRIPTION

[0024] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as limiting the present invention, but rather as a more detailed description of certain aspects, features, and embodiments of the present invention.

[0025] It should be understood that the terms described herein are intended only to describe particular embodiments and are not intended to limit the present invention. In addition, for numerical ranges herein, it should be understood that each intermediate value between the upper and lower limits of the range is also specifically disclosed. Each smaller range between any intermediate value within a stated value or stated range and any other stated value or intermediate value within the stated range is also encompassed by the present invention. The upper and lower limits of these smaller ranges may be independently included or excluded within the scope.

[0026] Unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art. Although only preferred methods and materials are described herein, any methods and materials similar or equivalent to those described herein may also be used in the practice or testing of the present invention. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or materials associated with the documents. In the event of any conflict with any incorporated document, the contents of this specification shall prevail.

[0027] It will be apparent to those skilled in the art that various modifications and variations may be made to the specific embodiments of the present invention without departing from the scope or spirit of the invention. Other embodiments will be apparent to those skilled in the art from the present invention. The present description and examples are intended to be illustrative only.

[0028] The words “include,” “including,” “have,” “contain,” etc. used in this document are open-ended terms, meaning including but not limited to.

[0029] Unless otherwise specified, the "parts" described in the present invention are based on mass parts.

[0030] The surfactants used in the present invention are all from China Daily Chemical Research Institute Co., Ltd.

[0031] A green solvent-free water-based special cleaning agent for cold-rolled steel plates comprises the following raw materials in percentage by mass: 0.4-1.0% green plant-based chelating agent (preferably 0.4-0.7%), 5-12% green emulsifier, 2-3% penetrant, 0.05-0.2% rust inhibitor (preferably 0.05-0.1%), and the balance is water.

[0032] In some preferred embodiments, the green plant-based chelating agent is a mixture of carboxymethyl cellulose and other chelating agents, wherein the mass ratio of carboxymethyl cellulose to other chelating agents is (0.3-0.8):(0.1-0.2). Carboxymethyl cellulose is used as a flocculant and is more effective than sodium gluconate in removing calcium ions. It is also an excellent anti-redeposition agent, providing chelation and rust prevention.

[0033] In some preferred embodiments, the other chelating agent is one or more of sodium gluconate, aminotriacetic acid and ethylenediaminetetraacetic acid.

[0034] In some preferred embodiments, the green emulsifier is one or more of an alkyl glycoside surfactant, an alkyl xyloside surfactant, a chlorohydrin ether carboxylate surfactant, and a modified oil ethoxylate. The alkyl glycoside surfactant is used in an amount of 1-3%, the alkyl xyloside surfactant is used in an amount of 2-4%, the chlorohydrin ether carboxylate surfactant is used in an amount of 1-3%, and the modified oil ethoxylate is used in an amount of 1-2%.

[0035] In some preferred embodiments, the alkyl glycoside surfactant is one or more of APG08 (isooctyl glucoside), APG10 (decyl glucoside), APG12 (dodecyl glucoside), APG0810 and APG1214;

[0036] The alkyl xyloside surfactant is C 10-AX、C8-AX、C 810 -One or more of AX and octyldodecyl xyloside;

[0037] The chlorohydrin ether carboxylate surfactant is one or two of AEC-6H, AEC-7H, AEC-8H and AEC-9H;

[0038] The modified oil ethoxylate is one or two of SOE-N-60, SOE-C-60, FMEE and SNS-80.

[0039] In some preferred embodiments, the penetrant is one or more of JFC (fatty alcohol polyoxyethylene ether), OEP-70 (penetrant OEP-70), AEP-98, fast penetrant T and low foaming penetrant SF.

[0040] In some preferred embodiments, the rust inhibitor is one or more of monoethanolamine, diethanolamine, and triethanolamine. Triethanolamine oleate, formed by reacting triethanolamine with oleic acid, is an excellent corrosion inhibitor that effectively protects metal surfaces from oxidation. Adding triethanolamine to liquid detergents improves the removal of oily stains, particularly non-polar sebum, while also enhancing detergency by increasing alkalinity.

[0041] The present invention also provides a preparation method of a green solvent-free water-based special cleaning agent for cold-rolled steel plates. The raw materials are weighed according to mass, and a green plant-based chelating agent, a green emulsifier penetrant and a rust inhibitor are added to water in sequence. Each time a raw material is added, the next raw material is added after it is completely dissolved, and the mixture is stirred evenly to obtain a green solvent-free water-based special cleaning agent for cold-rolled steel plates.

[0042] Example 1

[0043] The invention discloses a green solvent-free water-based special cleaning agent for cold-rolled steel plates, which is composed of the following raw materials in the following mass percentages: 0.5% green plant-based chelating agent, 8% green emulsifier, 2% penetrant, 0.1% rust inhibitor, and the balance water.

[0044] Among them, the green plant-based chelating agent is a mixture of carboxymethyl cellulose and sodium gluconate with a mass ratio of 4:1;

[0045] Green emulsifier is APG08, C 10 -AX, AEC-6H and SOE-N-60;

[0046] The penetrant is OEP-70;

[0047] The rust inhibitor is triethanolamine.

[0048] Preparation of green solvent-free water-based special cleaning agent for cold-rolled steel plates:

[0049] Weigh 894g of distilled water, add 5g of green plant-based chelating agent (carboxymethyl cellulose mass is 4g, sodium gluconate mass is 1g) and stir for 20min until the chelating agent is completely dissolved; add 80g of green emulsifier (APG08 mass is 20g, C 10 -AX mass is 30g, AEC-6H mass is 20g, SOE-N-60 mass is 10g), and 20g penetrant OEP-70 are added, stirred for 1h, and fully dissolved; finally, 1g of rust inhibitor triethanolamine is added, and stirring is continued for 1h to obtain 1# green solvent-free water-based special cleaning agent for cold-rolled steel plates.

[0050] Example 2

[0051] The invention discloses a green solvent-free water-based special cleaning agent for cold-rolled steel plates, which is composed of the following raw materials in the following mass percentages: 0.4% green plant-based chelating agent, 10% green emulsifier, 3% penetrant, 0.2% rust inhibitor, and the balance water.

[0052] Among them, the green plant-based chelating agent is a mixture of carboxymethyl cellulose and ethylenediaminetetraacetic acid with a mass ratio of 3:1;

[0053] Green emulsifier is APG0810, C 10 -AX, octyldodecanol xyloside, AEC-8H, SNS-80;

[0054] The penetrant was penetrant JFC;

[0055] The rust inhibitor is diethanolamine.

[0056] Preparation of green solvent-free water-based special cleaning agent for cold-rolled steel plates:

[0057] Weigh 864g of distilled water, add 4g of green chelating agent (carboxymethyl cellulose mass is 3g, ethylenediaminetetraacetic acid mass is 1g) and stir for 20min until the chelating agent is completely dissolved; add 100g of green emulsifier (APG0810 mass is 25g, C 10 -AX mass is 10g, octyldodecanol xyloside mass is 30g, AEC-8H mass is 20g, SNS-80 mass is 15g), and 30g penetrant OEP-70 mass are stirred for 1 hour to fully dissolve; finally, 2g of rust inhibitor diethanolamine is added and stirring is continued for 1 hour to obtain 2# green solvent-free water-based special cleaning agent for cold-rolled steel plates.

[0058] Example 3

[0059] The invention discloses a green solvent-free water-based special cleaning agent for cold-rolled steel plates, which is composed of the following raw materials in the following mass percentages: 0.5% green plant-based chelating agent, 11% green emulsifier, 2.5% penetrant, 0.1% rust inhibitor, and the balance being water.

[0060] Among them, the green plant-based chelating agent is a mixture of carboxymethyl cellulose and aminotriacetic acid with a mass ratio of 4:1;

[0061] Green emulsifier is APG1214, C 810 -AX, C 10 -AX, AEC-9H, SOE-C-60;

[0062] The penetrants were penetrant JFC and OEP-70;

[0063] The rust inhibitor is triethanolamine.

[0064] Preparation of green solvent-free water-based special cleaning agent for cold-rolled steel plates:

[0065] Weigh 869g of distilled water, add 5g of green chelating agent (4g of carboxymethyl cellulose and 1g of aminotriacetic acid) and stir for 20min until the chelating agent is completely dissolved; add 110g of green emulsifier (30g of APG1214 and 1g of C 810 -AX mass is 20g, C 10 -AX mass is 20g, AEC-9H mass is 20g, SOE-C-60 mass is 20g), and 25g penetrant (penetrant JFC mass is 10g, OEP-70 mass is 15g), stir for 1 hour, and fully dissolve; finally, add 1g of rust inhibitor triethanolamine, continue stirring for 1 hour, and obtain 3# green solvent-free water-based special cleaning agent for cold-rolled steel plate.

[0066] Example 4

[0067] A green solvent-free water-based special cleaning agent for cold-rolled steel plates is composed of the following raw materials in percentage by mass: 0.4% green plant-based chelating agent, 9% green emulsifier, 2.1% penetrant, 0.2% rust inhibitor, and the balance water.

[0068] Among them, the green plant-based chelating agent is a mixture of carboxymethyl cellulose and aminotriacetic acid with a mass ratio of 3:1;

[0069] Green emulsifiers are APG1214, APG10, C8-AX, octyldodecanol xyloside, AEC-9H, FMEE, and SOE-N-60;

[0070] The penetrants were penetrant JFC and AEP-98;

[0071] The rust inhibitor is triethanolamine.

[0072] Preparation of green solvent-free water-based special cleaning agent for cold-rolled steel plates:

[0073] Weigh 894g of distilled water, add 4g of green chelating agent (4g of carboxymethyl cellulose and 1g of aminotriacetic acid) and stir for 20min until the chelating agent is completely dissolved; add 90g of green emulsifier (12g of APG1214, 12g of APG10, 12g of C8-AX, 12g of octyldodecanol xyloside, 17g of AEC-9H, 8g of FMEE, and 17g of SOE-N-60), and 21g of penetrant (10g of penetrant JFC and 11g of AEP-98), stir for 1h, and fully dissolve; finally, add 2g of rust inhibitor triethanolamine and continue stirring for 1h to obtain 4# green solvent-free water-based special cleaning agent for cold-rolled steel plates.

[0074] Example 5

[0075] A green solvent-free water-based special cleaning agent for cold-rolled steel plates is composed of the following raw materials in percentage by mass: 0.45% green plant-based chelating agent, 9.5% green emulsifier, 2% penetrant, 0.05% rust inhibitor, and the balance is water.

[0076] Among them, the green plant-based chelating agent is a mixture of carboxymethyl cellulose and aminotriacetic acid with a mass ratio of 0.3:0.15;

[0077] Green emulsifiers are APG10, octyldodecanol xyloside, AEC-9H, SNS-80, and SOE-N-60;

[0078] The penetrants were penetrant JFC, AEP-98, and OEP-70;

[0079] The rust inhibitor is monoethanolamine.

[0080] Preparation of green solvent-free water-based special cleaning agent for cold-rolled steel plates:

[0081] Weigh 881g of distilled water, add 0.45g of green chelating agent (carboxymethyl cellulose with a mass of 0.3g and aminotriacetic acid with a mass of 0.15g) and stir for 20min until the chelating agent is completely dissolved; add 95g of green emulsifier (APG10 with a mass of 30g, octyldodecanol xyloside with a mass of 25g, AEC-9H with a mass of 20g, SNS-80 with a mass of 12g, SOE-N-60 with a mass of 8g), and 20g of penetrant (penetrant JFC with a mass of 5g, AEP-98 with a mass of 5g, OEP-70 with a mass of 10g), stir for 1h, and fully dissolve; finally, add 0.5g of rust inhibitor monoethanolamine and continue stirring for 1h to obtain 5# green solvent-free water-based special cleaning agent for cold-rolled steel plates.

[0082] Test Example 1

[0083] The green solvent-free water-based special cleaning agent for cold-rolled steel plates of the present invention is used as follows: dilute it according to needs, adjust the concentration as needed, generally 3-10%, and adjust the use temperature as needed, generally 50-70°C.

[0084] The cleaning power and corrosiveness of the five green solvent-free water-based cold-rolled steel plate cleaning agents prepared in Examples 1-5 were tested. The test methods are as follows:

[0085] Cleaning power test method:

[0086] 1. Prepare artificial oil pollution according to QB / T2117-95.

[0087] 2. Coating of artificial oil pollution:

[0088] Prepare the stainless steel test piece as specified. Place the test piece holder in an oven at 40 ± 2°C and dry for 30 minutes. Then, transfer it to a desiccator and, after cooling, weigh it to an accuracy of ±0.2 mg. Place the weighed test piece flat on clean filter paper. Use a small scraper to scrape the artificial oil stain and evenly apply it to the designated area on one side of the test piece, leaving the rest of the surface uncoated. Wipe off any excess oil on the sides and bottom of the test piece with filter paper. The amount of oil applied should be between 0.08 and 0.19 g.

[0089] Then hang the oil-coated test piece on the test piece rack with an S-shaped hook and put it into a constant temperature drying oven controlled at (40±2℃). Take it out after drying for 30 minutes, wipe off the oil on the bottom edge with filter paper, and cool and weigh it in a desiccator.

[0090] 3. Washing:

[0091] Pour 400 mL of detergent solution into a 500 mL beaker, then place the beaker in a (60 ± 2) °C water bath to maintain the detergent solution temperature at (60 ± 2) °C. Clamp the oil-stained test piece onto the swing rack of the swing washer, with the test piece surface perpendicular to the swing direction. Soak in the detergent solution for 3 minutes, then immediately start the swing washer and swing for 3 minutes. After the swing wash is complete, remove the test piece along with the hook and swing wash it in 400 mL of RO water at (60 ± 2) °C for 30 seconds. Hang it on the test piece rack and place it in a constant temperature drying oven at (40 ± 2) °C. Dry it for 2 hours, cool it to room temperature, weigh it, and calculate the cleaning power according to the following formula (1).

[0092] The results show that:

[0093] The cleaning power X1 is expressed as the mass fraction of oil removed and is calculated according to the formula:

[0094]

[0095] In the formula: X1——cleaning power, %

[0096] m0——mass of test piece, g;

[0097] m1——mass of the oil-coated test piece before cleaning, g;

[0098] m2——The mass of the oil-coated test piece after cleaning, g.

[0099] The cleaning power obtained from the parallel experiments of three test pieces should have a value of no more than 3% for at least two of them. The average value is used as the final result.

[0100] Rust resistance test method:

[0101] Place the medicine tank containing 400mL of cleaning agent in a constant temperature water bath to keep the test solution temperature at 80℃, hang the prepared test piece with an S hook and place it in the test solution for 30 seconds and then take it out. Use filter paper to absorb the liquid at the bottom and hole of the test piece, hang it vertically on the test piece rack, place the test piece and the rack in a 35℃ oven to dry for 15 minutes, then move the test piece and the rack into a humidifier that has been placed in a 35±2℃ oven to maintain a constant temperature and relative humidity of (90±2)%, and place it for 24 hours. The oven temperature is always kept at 35℃. After the test period, the 45# steel sheet and Z 30 Cast iron sheet, H 62 Producer, LY 12 Rinse the slide with steamed water first, then wipe it dry with absorbent gauze or cotton wool and check its appearance.

[0102] Test method of hand rubbing before and after washing steel plate:

[0103] Prepare 400mL of cleaning solution, adjusting the concentration as desired. Place the test solution in a 70°C waterbath. Cut the steel plate to be tested into 8cm x 6cm rectangles, labeling the front with plates 1 and 2. Hand-rub a 3cm x 6cm area of the plate on a piece of paper. The area that appears colored indicates the pre-wash area. Soak the lower half of the plate in the test solution. Start the oscillating washer and oscillate for 10 seconds. Rinse with Ro water for 30 seconds. Remove the plate and rub the same area on the back. The area that appears colored indicates the post-wash area. Compare the color depth before and after washing to determine the cleaning effect.

[0104] The main technical indicators are shown in Table 1. Figure 1 The results of hand rubbing before and after washing the steel plate.

[0105] Table 1

[0106]

[0107] Note: "0" and "1" in the table represent the anti-rust level.

[0108] It can be seen from Table 1 that the anti-rust performance and cleaning power of the samples meet the national standard requirements.

[0109] from Figure 1 It can be seen that the sample has a strong decontamination ability, and the steel plate has obvious differences before and after washing.

[0110] Comparative Example 1

[0111] The same as Example 2, except that the amount of green plant-based chelating agent added is 2%, and the specific composition ratio remains unchanged. The cleaning agent prepared by this comparative example has a cleaning power of 90% and a rust-proof property of 0 for 45# steel.

[0112] Comparative Example 2

[0113] The same as Example 2, except that the amount of green emulsifier added is 15%, and the specific composition ratio remains unchanged. The cleaning agent prepared by this comparative example has a cleaning power of 88% and an anti-rust property of 1 for 45# steel.

[0114] Comparative Example 3

[0115] The cleaning agent prepared in this comparative example has a cleaning power of 91% and a rust-proof property of 0 on 45# steel.

[0116] Comparative Example 4

[0117] The cleaning agent prepared in this comparative example has a cleaning power of 89% and a rust-proof property of 0 on 45# steel.

[0118] Comparative Example 5

[0119] Same as Example 2, except that the mass ratio of carboxymethyl cellulose to other chelating agents in the green plant-based chelating agent is 1:1.

[0120] The cleaning agent prepared by this comparative example has a cleaning power of 85% and an anti-rust property of 1 for 45# steel.

[0121] Comparative Example 6

[0122] The same as Example 2, except that the green emulsifiers are 30g APG0810, 30g AEC-8H, and 40g SNS-80. The cleaning agent prepared by this comparative example has a cleaning power of 86% and an anti-rust property of 1 for 45# steel.

[0123] The above are merely preferred embodiments of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A green solvent-free water-based special cleaning agent for cold-rolled steel plates, characterized in that: The invention comprises the following raw materials in percentage by weight: 0.4-1.0% green plant-based chelating agent, 5-12% green emulsifier, 2-3% penetrant, 0.05-0.2% rust inhibitor, and the balance is water; The green plant-based chelating agent is a mixture of carboxymethyl cellulose and other chelating agents, wherein the mass ratio of carboxymethyl cellulose to other chelating agents is (0.3-0.8):(0.1-0.2); The other chelating agents are one or more of sodium gluconate, aminotriacetic acid and ethylenediaminetetraacetic acid; The green emulsifier is composed of an alkyl glycoside surfactant, an alkyl xyloside surfactant, a chlorohydrin ether carboxylate surfactant, and a modified oil ethoxylate; The mass ratio of the alkyl glycoside surfactant, the alkyl xyloside surfactant, the chlorohydrin ether carboxylate surfactant, and the modified oil ethoxylate is (1-3):(2-4):(1-3):(1-2).

2. The green solvent-free water-based special cleaning agent for cold-rolled steel plates according to claim 1, characterized in that: The alkyl glycoside surfactant is one or more of APG08, APG10, APG12, APG0810 and APG1214; The alkyl xyloside surfactant is C 10 -AX、C8-AX、C 810 -One or more of AX and octyldodecyl xyloside; The chlorohydrin ether carboxylate surfactant is one or two of AEC-6H, AEC-7H, AEC-8H and AEC-9H; The modified oil ethoxylate is one or two of SOE-N-60, SOE-C-60, FMEE and SNS-80.

3. The green solvent-free water-based special cleaning agent for cold-rolled steel plates according to claim 1, characterized in that: The penetrant is one or more of JFC, OEP-70, AEP-98, fast penetrant T and low-foaming penetrant SF.

4. The green solvent-free water-based special cleaning agent for cold-rolled steel plates according to claim 1, characterized in that: The rust inhibitor is one or more of monoethanolamine, diethanolamine and triethanolamine.

5. A method for preparing the green solvent-free water-based special cleaning agent for cold-rolled steel sheets according to any one of claims 1 to 4, characterized in that: Weigh the raw materials by mass, add a green plant-based chelating agent, a green emulsifier, a penetrant and a rust inhibitor into water in sequence, and stir to obtain a green solvent-free water-based special cleaning agent for cold-rolled steel plates.

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