Environment-friendly water-based mechanical part cleaning agent and preparation method thereof

Abstract

The application discloses an environment-friendly water-based mechanical part cleaning agent and a preparation method thereof. The environment-friendly water-based mechanical part cleaning agent is prepared from the following raw materials in parts by weight: dispersing chelating agent 5-20 parts, alkaline auxiliary agent 1-10 parts, thickening agent 5-20 parts, non-ionic surfactant 20-60 parts, and deionized water 20-60 parts. The non-ionic surfactant is polyoxyethylene type and / or fatty acid ester type non-ionic surfactant. The environment-friendly water-based mechanical part cleaning agent prepared by the application does not contain harmful chemical components such as phosphate, strong acid, strong base and aluminum salt, is friendly to the environment, has excellent cleaning capacity, good rust prevention performance, good high-low temperature stability and long service life.

Description

Technical Field

[0001] This invention belongs to the field of cleaning technology, classified as C11D1 / 72, and specifically relates to an environmentally friendly water-based cleaning agent for mechanical parts and its preparation method. Background Technology

[0002] Currently in industry, before surface treatments such as phosphating, coating, and electroplating, metal parts must first be thoroughly cleaned of surface oil. Cleaning mechanical parts typically involves using volatile oil-based cleaning products, such as gasoline, solvent oil, kerosene, and diesel oil. These products are primarily composed of toluene, dichloromethane, methanol, and other highly toxic and environmentally damaging ingredients. While this method offers strong degreasing capabilities and prevents rusting, its disadvantages include: 1. Low flash point, flammability, posing a production safety hazard; 2. Strong odor, highly toxic to humans; 3. Environmentally unfriendly, with waste oil difficult to dispose of and polluting the environment; 4. High usage volume, significant loss of volatile products, and high costs; 5. Safety hazards during production and use. While ordinary water-based cleaning agents offer strong cleaning capabilities and are relatively safe, they can easily cause rusting in the cleaned parts.

[0003] Chinese patent CN103510100B discloses a metal cleaning agent prepared from components such as anionic surfactants, cationic surfactants, and nonionic surfactants. The metal cleaning agent has good degreasing effect and excellent anti-corrosion performance at low temperatures. However, it does not solve the problem of high-temperature stability of the cleaning agent, and it contains phosphate components, which will cause certain harm to the environment.

[0004] Chinese patent CN1117141C discloses a high-efficiency metal cleaning agent, which is prepared by using alkylphenol polyoxyethylene ether, dodecyl diethanolamide, triethanolamine and other components to produce a cleaning agent with good rust prevention properties. However, its cleaning rate is only 91.7%. Although it does not pollute the environment, its cleaning rate still needs to be further improved. Summary of the Invention

[0005] To address the aforementioned problems, the first aspect of this invention provides an environmentally friendly water-based cleaning agent for mechanical parts, comprising, by weight, the following raw materials: 5-20 parts of dispersing and chelating agent, 1-10 parts of alkaline additive, 5-20 parts of thickener, 20-60 parts of nonionic surfactant, and 20-60 parts of deionized water; wherein the nonionic surfactant is a polyoxyethylene type and / or a fatty acid ester type nonionic surfactant.

[0006] More preferably, the environmentally friendly water-based mechanical parts cleaning agent, by weight, comprises the following raw materials: 10-15 parts of dispersing and chelating agent, 3-5 parts of alkaline additive, 10-15 parts of thickener, 28-40 parts of nonionic surfactant, and 20-40 parts of deionized water; the polyoxyethylene nonionic surfactant includes at least one of fatty alcohol polyoxyethylene ether, fatty acid polyoxyethylene ester, alkylphenol polyoxyethylene ether, polyoxyethylene amide, polyoxyethylene fatty amine, and Tween, wherein the fatty acid ester nonionic surfactant is an isomeric fatty acid ester ethyl compound.

[0007] More preferably, the environmentally friendly water-based mechanical parts cleaning agent, by weight, comprises the following raw materials: 12 parts of dispersing and chelating agent, 4 parts of alkaline additive, 13 parts of thickener, 36 parts of nonionic surfactant, and 35 parts of deionized water; wherein the nonionic surfactant is an alkylphenol polyoxyethylene ether and an isomeric fatty acid ester ethyl compound.

[0008] Preferably, the dispersing chelating agent is a carboxylic acid compound.

[0009] Preferably, the alkaline additive is an inorganic base.

[0010] Preferably, the inorganic base is at least one of sodium silicate, sodium carbonate, sodium hydroxide, sodium metasilicate, sodium citrate, potassium hydroxide, and ammonia.

[0011] More preferably, the inorganic base is sodium silicate.

[0012] Preferably, the thickener is a polymer containing terminal hydroxyl groups.

[0013] More preferably, the polymer containing terminal hydroxyl groups is polyethylene glycol.

[0014] Preferably, the polymer containing terminal hydroxyl groups has an average molecular weight of <1000.

[0015] More preferably, the polymer containing terminal hydroxyl groups has an average molecular weight of 200-800.

[0016] More preferably, the polymer containing terminal hydroxyl groups has an average molecular weight of 200-600.

[0017] More preferably, the polymer containing terminal hydroxyl groups has an average molecular weight of 400.

[0018] Preferably, the nonionic surfactant further includes a nonionic surfactant containing fatty amides.

[0019] More preferably, the specific components of the fatty amide-containing nonionic surfactant are fatty amide ethyl oxides, fatty acids, isomeric branched amines, and ethoxylated alcohol ethers.

[0020] This application incorporates a nonionic surfactant containing fatty amides. The presence of amide bonds facilitates the formation of hydrogen bonds, reduces the critical micelle concentration, and improves the stability of the system to some extent. In addition, the presence of a small amount of fatty acids, together with sodium silicate, further enhances the rust-preventive properties of the cleaning agent.

[0021] Preferably, the HLB values ​​of the polyoxyethylene type, fatty acid ester type nonionic surfactant, and fatty amide type nonionic surfactant are all less than 18.

[0022] More preferably, the HLB values ​​of the polyoxyethylene type, fatty acid ester type nonionic surfactant, and fatty amide type nonionic surfactant are all less than 15.

[0023] More preferably, the HLB values ​​of the polyoxyethylene type, fatty acid ester type nonionic surfactant and fatty amide type nonionic surfactant are all 11-14.5.

[0024] Preferably, the nonionic surfactant is a fatty amide-type nonionic surfactant, a polyoxyethylene type, and a fatty acid ester type, with a mass ratio of (15-20):(3-5):(10-15).

[0025] This application specifies that the mass ratio of fatty amide nonionic surfactant, alkylphenol polyoxyethylene ether, and isomeric fatty acid ethyl compound is (15-20):(3-5):(10-15). Under the combined action of carboxylic acid compounds, the three compounds can improve the cleaning rate to 99.9%. At the same time, the alkyl carbon chain of alkylphenol polyoxyethylene ether can not only effectively dissolve nonpolar substances and has good detergency, but also has certain corrosion inhibition properties. The isomeric ester structure of isomeric fatty acid ethyl compound can improve the water-vapor permeability of the system, further improving the wetting performance and stability of the cleaning agent. Under the combined action of polyethylene glycol with an average molecular weight of 400, the molecules in the system can form a balanced and stable spatial sequence, resulting in high stability.

[0026] More preferably, the nonionic surfactant is a fatty amide nonionic surfactant, a polyoxyethylene type and a fatty acid ester, with a mass ratio of (16-19):(3-5):(12-15).

[0027] More preferably, the nonionic surfactant is a fatty amide-type nonionic surfactant, a polyoxyethylene type, and a fatty acid ester-type nonionic surfactant, with a mass ratio of 18:4:14.

[0028] The second aspect of this invention provides a method for preparing an environmentally friendly water-based cleaning agent for mechanical parts, comprising the following steps: first, adding deionized water according to the weight ratio, heating at room temperature and then adding an alkaline additive, stirring and cooling, then adding a dispersing chelating agent, a thickener and a nonionic surfactant according to the weight ratio, stirring at a constant temperature and then cooling to obtain the cleaning agent.

[0029] Beneficial effects:

[0030] (1) The environmentally friendly water-based mechanical parts cleaning agent prepared by the present invention has no flash point, no safety hazards, mild odor, and is non-allergenic and does not harm the hands of operators. The waste liquid can be biodegraded and does not contain harmful chemical components such as phosphates, strong acids, strong alkalis and aluminum salts. It is environmentally friendly, requires less usage, has less loss and low cost, and meets the national RoHS testing requirements and CMA and CNAS standards.

[0031] (2) The environmentally friendly water-based mechanical parts cleaning agent prepared by the present invention has excellent cleaning ability, good rust prevention performance, good high and low temperature stability, and long service life. It solves the problem of poor rust prevention performance of water-based cleaning agents in the prior art. In addition, the cleaning agent is mainly used for non-ferrous metals, such as aluminum, magnesium alloys, copper alloys, etc., and has the best rust prevention performance for copper alloys.

[0032] (3) The preparation method of the present invention for preparing environmentally friendly water-based mechanical parts cleaning agent is simple and highly operable. Attached Figure Description

[0033] Figure 1 (Left) shows the copper alloy surface before cleaning, which is full of oil stains; (Right) shows the copper alloy surface after cleaning, which is bright and clean.

[0034] Figure 2 (Left) shows the steel surface before cleaning, and (Right) shows the steel surface after cleaning.

[0035] Figure 3 The die-cast aluminum surface was not cleaned, and white spots were present on the surface.

[0036] Figure 4 This is the surface of the die-cast aluminum after cleaning. Example

[0037] Example 1

[0038] An environmentally friendly water-based cleaning agent for mechanical parts, by weight, comprises the following raw materials: 12 parts of dispersing and chelating agent, 4 parts of alkaline additive, 13 parts of thickener, 36 parts of nonionic surfactant, and 35 parts of deionized water; wherein the nonionic surfactant is an alkylphenol polyoxyethylene ether and an isomeric fatty acid ester ethyl compound.

[0039] The dispersing and chelating agent is a carboxylic acid compound with an average molecular weight of 600-1200 g / mol and a pH value (1% aqueous solution) of 7.5-9.5. It was purchased from Shenzhen Rongqiang Technology Co., Ltd. and is model PA-9.

[0040] The alkaline additive is sodium silicate.

[0041] The thickener is polyethylene glycol with an average molecular weight of 360-440, purchased from Haian Petrochemical Plant in Jiangsu Province.

[0042] The nonionic surfactant is a nonionic surfactant containing fatty amide, alkylphenol polyoxyethylene ether and isomeric fatty acid ester ethyl compound, with a mass ratio of 18:4:14.

[0043] The specific components of the nonionic surfactant containing fatty amides are fatty amide ethyl oxides, fatty acids, isomeric branched amines and ethoxylated alcohols. Its HLB value is 12.5-14.5, cloud point (1% aqueous solution) is 61℃, freezing point is -4℃, pH value (1% aqueous solution) is 7.5-9.5, and it was purchased from Shenzhen Rongqiang Technology Co., Ltd., model RQ-223H.

[0044] The alkylphenol polyoxyethylene ether has an HLB value of 11-13, a cloud point (1% aqueous solution) of 39℃, a freezing point of 9.9℃, and a pH value (1% aqueous solution) of 6.5-8.0. It was purchased from Shenzhen Rongqiang Technology Co., Ltd., model RQ-8.

[0045] The isomeric fatty acid ester ethyl compound has an HLB value of 12.8, a cloud point (1% aqueous solution) > 100℃, and a pH value (1% aqueous solution) of 6.0-8.5. It was purchased from Shenzhen Rongqiang Technology Co., Ltd., model X-6.

[0046] The second aspect of this invention provides a method for preparing an environmentally friendly water-based cleaning agent for mechanical parts, comprising the following steps: first, adding deionized water according to the weight ratio, heating the deionized water from 25°C to 90°C, adding an alkaline additive, stirring at a constant temperature for 30 minutes, cooling to 60°C, then adding a dispersing chelating agent, a thickener, and a nonionic surfactant according to the weight ratio, stirring at a constant temperature for 30 minutes, and then cooling to 25°C to obtain the cleaning agent.

[0047] Example 2

[0048] An environmentally friendly water-based cleaning agent for mechanical parts, by weight, comprises the following raw materials: 15 parts of dispersing and chelating agent, 5 parts of alkaline additive, 15 parts of thickener, 40 parts of nonionic surfactant, and 25 parts of deionized water; wherein the nonionic surfactant is an alkylphenol polyoxyethylene ether and an isomeric fatty acid ester ethyl compound.

[0049] The dispersing and chelating agent is a carboxylic acid compound with an average molecular weight of 600-1200 g / mol and a pH value (1% aqueous solution) of 7.5-9.5. It was purchased from Shenzhen Rongqiang Technology Co., Ltd. and is model PA-9.

[0050] The alkaline additive is sodium silicate.

[0051] The thickener is polyethylene glycol with an average molecular weight of 360-440, purchased from Haian Petrochemical Plant in Jiangsu Province.

[0052] The nonionic surfactant is a nonionic surfactant containing fatty amide, alkylphenol polyoxyethylene ether and isomeric fatty acid ester ethyl compound, with a mass ratio of 18:4:14.

[0053] The specific components of the nonionic surfactant containing fatty amides are fatty amide ethyl oxides, fatty acids, isomeric branched amines and ethoxylated alcohols. Its HLB value is 12.5-14.5, cloud point (1% aqueous solution) is 61℃, freezing point is -4℃, pH value (1% aqueous solution) is 7.5-9.5, and it was purchased from Shenzhen Rongqiang Technology Co., Ltd., model RQ-223H.

[0054] The alkylphenol polyoxyethylene ether has an HLB value of 11-13, a cloud point (1% aqueous solution) of 39℃, a freezing point of 9.9℃, and a pH value (1% aqueous solution) of 6.5-8.0. It was purchased from Shenzhen Rongqiang Technology Co., Ltd., model RQ-8.

[0055] The isomeric fatty acid ester ethyl compound has an HLB value of 12.8, a cloud point (1% aqueous solution) > 100℃, and a pH value (1% aqueous solution) of 6.0-8.5. It was purchased from Shenzhen Rongqiang Technology Co., Ltd., model X-6.

[0056] The second aspect of this invention provides a method for preparing an environmentally friendly water-based cleaning agent for mechanical parts, comprising the following steps: first, adding deionized water according to the weight ratio, heating the deionized water from 25°C to 90°C, adding an alkaline additive, stirring at a constant temperature for 30 minutes, cooling to 60°C, then adding a dispersing chelating agent, a thickener, and a nonionic surfactant according to the weight ratio, stirring at a constant temperature for 30 minutes, and then cooling to 25°C to obtain the cleaning agent.

[0057] Example 3

[0058] An environmentally friendly water-based cleaning agent for mechanical parts, by weight, comprises the following raw materials: 10 parts of dispersing and chelating agent, 3 parts of alkaline additive, 10 parts of thickener, 40 parts of nonionic surfactant, and 37 parts of deionized water; wherein the nonionic surfactant is an alkylphenol polyoxyethylene ether and an isomeric fatty acid ester ethyl compound.

[0059] The dispersing and chelating agent is a carboxylic acid compound with an average molecular weight of 600-1200 g / mol and a pH value (1% aqueous solution) of 7.5-9.5. It was purchased from Shenzhen Rongqiang Technology Co., Ltd. and is model PA-9.

[0060] The alkaline additive is sodium silicate.

[0061] The thickener is polyethylene glycol with a molecular weight of 360-440, purchased from Haian Petrochemical Plant in Jiangsu Province.

[0062] The nonionic surfactant is a nonionic surfactant containing fatty amide, alkylphenol polyoxyethylene ether and isomeric fatty acid ester ethyl compound, with a mass ratio of 18:4:14.

[0063] The specific components of the nonionic surfactant containing fatty amides are fatty amide ethyl oxides, fatty acids, isomeric branched amines and ethoxylated alcohols. Its HLB value is 12.5-14.5, cloud point (1% aqueous solution) is 61℃, freezing point is -4℃, pH value (1% aqueous solution) is 7.5-9.5, and it was purchased from Shenzhen Rongqiang Technology Co., Ltd., model RQ-223H.

[0064] The alkylphenol polyoxyethylene ether has an HLB value of 11-13, a cloud point (1% aqueous solution) of 39℃, a freezing point of 9.9℃, and a pH value (1% aqueous solution) of 6.5-8.0. It was purchased from Shenzhen Rongqiang Technology Co., Ltd., model RQ-8.

[0065] The isomeric fatty acid ester ethyl compound has an HLB value of 12.8, a cloud point (1% aqueous solution) > 100℃, and a pH value (1% aqueous solution) of 6.0-8.5. It was purchased from Shenzhen Rongqiang Technology Co., Ltd., model X-6.

[0066] The second aspect of this invention provides a method for preparing an environmentally friendly water-based cleaning agent for mechanical parts, comprising the following steps: first, adding deionized water according to the weight ratio, heating the deionized water from 25°C to 90°C, adding an alkaline additive, stirring at a constant temperature for 30 minutes, cooling to 60°C, then adding a dispersing chelating agent, a thickener, and a nonionic surfactant according to the weight ratio, stirring at a constant temperature for 30 minutes, and then cooling to 25°C to obtain the cleaning agent.

[0067] Comparative Example 1

[0068] An environmentally friendly water-based cleaning agent for mechanical parts, by weight, comprises the following raw materials: 12 parts of dispersing and chelating agent, 4 parts of alkaline additive, 13 parts of thickener, 36 parts of nonionic surfactant, and 35 parts of deionized water; wherein the nonionic surfactant is an alkylphenol polyoxyethylene ether and an isomeric fatty acid ester ethyl compound.

[0069] The dispersing and chelating agent is a carboxylic acid compound with an average molecular weight of 600-1200 g / mol and a pH value (1% aqueous solution) of 7.5-9.5. It was purchased from Shenzhen Rongqiang Technology Co., Ltd. and is model PA-9.

[0070] The alkaline additive is sodium silicate.

[0071] The thickener is polyethylene glycol with a molecular weight of 360-440, purchased from Haian Petrochemical Plant in Jiangsu Province.

[0072] The nonionic surfactant is an alkylphenol polyoxyethylene ether and an isomeric fatty acid ester ethyl compound, with a mass ratio of 10:26.

[0073] The alkylphenol polyoxyethylene ether has an HLB value of 11-13, a cloud point (1% aqueous solution) of 39℃, a freezing point of 9.9℃, and a pH value (1% aqueous solution) of 6.5-8.0. It was purchased from Shenzhen Rongqiang Technology Co., Ltd., model RQ-8.

[0074] The isomeric fatty acid ester ethyl compound has an HLB value of 12.8, a cloud point (1% aqueous solution) > 100℃, and a pH value (1% aqueous solution) of 6.0-8.5. It was purchased from Shenzhen Rongqiang Technology Co., Ltd., model X-6. Comparative Example 2

[0075] An environmentally friendly water-based cleaning agent for mechanical parts, by weight, comprises the following raw materials: 12 parts of dispersing and chelating agent, 4 parts of alkaline additive, 13 parts of thickener, 36 parts of nonionic surfactant, and 35 parts of deionized water; wherein the nonionic surfactant is an alkylphenol polyoxyethylene ether and an isomeric fatty acid ester ethyl compound.

[0076] The dispersing and chelating agent is a carboxylic acid compound with an average molecular weight of 600-1200 g / mol and a pH value (1% aqueous solution) of 7.5-9.5. It was purchased from Shenzhen Rongqiang Technology Co., Ltd. and is model PA-9.

[0077] The alkaline additive is sodium silicate.

[0078] The thickener is polyethylene glycol with a molecular weight of 360-440, purchased from Haian Petrochemical Plant in Jiangsu Province.

[0079] The nonionic surfactant is a nonionic surfactant containing fatty amide, alkylphenol polyoxyethylene ether and isomeric fatty acid ester ethyl compound, with a mass ratio of 13:9:14.

[0080] The specific components of the nonionic surfactant containing fatty amides are fatty amide ethyl oxides, fatty acids, isomeric branched amines and ethoxylated alcohols. Its HLB value is 12.5-14.5, cloud point (1% aqueous solution) is 61℃, freezing point is -4℃, pH value (1% aqueous solution) is 7.5-9.5, and it was purchased from Shenzhen Rongqiang Technology Co., Ltd., model RQ-223H.

[0081] The alkylphenol polyoxyethylene ether has an HLB value of 11-13, a cloud point (1% aqueous solution) of 39℃, a freezing point of 9.9℃, and a pH value (1% aqueous solution) of 6.5-8.0. It was purchased from Shenzhen Rongqiang Technology Co., Ltd., model RQ-8.

[0082] The isomeric fatty acid ester ethyl compound has an HLB value of 12.8, a cloud point (1% aqueous solution) > 100℃, and a pH value (1% aqueous solution) of 6.0-8.5. It was purchased from Shenzhen Rongqiang Technology Co., Ltd., model X-6.

[0083] The second aspect of this invention provides a method for preparing an environmentally friendly water-based cleaning agent for mechanical parts, comprising the following steps: first, adding deionized water according to the weight ratio, heating the deionized water from 25°C to 90°C, adding an alkaline additive, stirring at a constant temperature for 30 minutes, cooling to 60°C, then adding a dispersing chelating agent, a thickener, and a nonionic surfactant according to the weight ratio, stirring at a constant temperature for 30 minutes, and then cooling to 25°C to obtain the cleaning agent.

[0084] Comparative Example 3

[0085] An environmentally friendly water-based cleaning agent for mechanical parts, by weight, comprises the following raw materials: 12 parts of dispersing and chelating agent, 4 parts of alkaline additive, 8 parts of thickener, 36 parts of nonionic surfactant, and 35 parts of deionized water; wherein the nonionic surfactant is an alkylphenol polyoxyethylene ether and an isomeric fatty acid ester ethyl compound.

[0086] The dispersing and chelating agent is a carboxylic acid compound with an average molecular weight of 600-1200 g / mol and a pH value (1% aqueous solution) of 7.5-9.5. It was purchased from Shenzhen Rongqiang Technology Co., Ltd. and is model PA-9.

[0087] The alkaline additive is sodium silicate.

[0088] The thickener is polyethylene glycol with a molecular weight of 900-1000, purchased from Haian Petrochemical Plant in Jiangsu Province.

[0089] The nonionic surfactant is a nonionic surfactant containing fatty amide, alkylphenol polyoxyethylene ether and isomeric fatty acid ester ethyl compound, with a mass ratio of 18:4:14.

[0090] The specific components of the nonionic surfactant containing fatty amides are fatty amide ethyl oxides, fatty acids, isomeric branched amines and ethoxylated alcohols. Its HLB value is 12.5-14.5, cloud point (1% aqueous solution) is 61℃, freezing point is -4℃, pH value (1% aqueous solution) is 7.5-9.5, and it was purchased from Shenzhen Rongqiang Technology Co., Ltd., model RQ-223H.

[0091] The alkylphenol polyoxyethylene ether has an HLB value of 11-13, a cloud point (1% aqueous solution) of 39℃, a freezing point of 9.9℃, and a pH value (1% aqueous solution) of 6.5-8.0. It was purchased from Shenzhen Rongqiang Technology Co., Ltd., model RQ-8.

[0092] The isomeric fatty acid ester ethyl compound has an HLB value of 12.8, a cloud point (1% aqueous solution) > 100℃, and a pH value (1% aqueous solution) of 6.0-8.5. It was purchased from Shenzhen Rongqiang Technology Co., Ltd., model X-6.

[0093] The second aspect of this invention provides a method for preparing an environmentally friendly water-based cleaning agent for mechanical parts, comprising the following steps: first, adding deionized water according to the weight ratio, heating the deionized water from 25°C to 90°C, adding an alkaline additive, stirring at a constant temperature for 30 minutes, cooling to 60°C, then adding a dispersing chelating agent, a thickener, and a nonionic surfactant according to the weight ratio, stirring at a constant temperature for 30 minutes, and then cooling to 25°C to obtain the cleaning agent.

[0094] Performance Evaluation

[0095] (1) Cleaning rate test: The cleaning agents prepared in the examples and comparative examples were tested according to JB / T4323.2-19996 (the metal is a copper alloy). The test results are shown in Table 1.

[0096] (2) Stability test: If no layering or precipitation occurs after the cleaning agent is placed for 6 months under high temperature of 60℃ and low temperature of 0℃, it is qualified; otherwise, it is unqualified.

[0097] (3) Rust prevention performance test: The test was conducted in accordance with the test standard GB / T61445.9 (the metal is a copper alloy), and the test results are shown in Table 1.

[0098] Table 1

[0099] Example Cleaning rate (%) stability Rust prevention time (days) Example 1 99.8 qualified 60 Example 2 99.7 qualified 60 Example 3 99.6 qualified 60 Comparative Example 1 85.2 Unqualified 40 Comparative Example 2 90.2 qualified 50 Comparative Example 3 95.2 Unqualified 55

Claims

1. An environmentally friendly water-based cleaning agent for mechanical parts, characterized in that, The raw materials for its preparation, by weight, include: 5-20 parts of dispersing and chelating agent, 1-10 parts of alkaline additive, 5-20 parts of thickener, 20-60 parts of nonionic surfactant, and 20-60 parts of deionized water. The nonionic surfactant is a fatty amide-based nonionic surfactant, an alkylphenol polyoxyethylene ether, and an isomeric fatty acid ester ethyl compound, in a mass ratio of (16-19):(3-5):(12-15); the HLB values ​​of the fatty amide-based nonionic surfactant, the alkylphenol polyoxyethylene ether, and the isomeric fatty acid ester ethyl compound are all 11-14.5; the thickener is a polymer containing terminal hydroxyl groups; the polymer containing terminal hydroxyl groups is polyethylene glycol; the average molecular weight of the polymer containing terminal hydroxyl groups is 200-600; The dispersing and chelating agent is a carboxylic acid compound; The alkaline additive is sodium silicate.

2. A method for preparing an environmentally friendly water-based cleaning agent for mechanical parts according to claim 1, characterized in that, The steps are as follows: First, heat deionized water and add alkaline additives, stir and then cool. Then add dispersing chelating agents, thickeners, and nonionic surfactants, stir at a constant temperature and then cool down to obtain the final product.

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