Water-based metal cleaning agent as well as preparation method and application thereof

Abstract

The invention discloses a water-based metal cleaning agent as well as a preparation method and application thereof. The water-based metal cleaning agent comprises water, a preservative and the following preparation raw materials in percentage by mass: 0.1%-0.3% of a nonionic surfactant A, 4%-6% of a nonionic surfactant B, 0.2%-0.5% of isooctyl alcohol polyoxyethylene ether phosphate and 1%-3% of a chelating agent, the nonionic surfactant A is selected from at least one of nonylphenol polyoxyethylene ether and octylphenol polyoxyethylene ether, and the number of oxyethylene units in the molecular structure is 6-8; the nonionic surfactant B is selected from at least one of cocoanut fatty acid diethanolamide and cocoanut fatty acid monoethanolamide. The cleaning agent has excellent metal surface cleaning capability, good low-foaming property and easy rinsing property. The invention further provides a preparation method and application of the water-based metal cleaning agent.

Description

Technical Field

[0001] This invention relates to the field of metal cleaning technology, and in particular to a water-based metal cleaning agent, its preparation method, and its application. Background Technology

[0002] During the molding process of high-voltage / ultra-high-voltage epoxy insulation components, it is necessary to clean the surface of the internal metal inserts (mainly copper and aluminum) to prevent impurities from entering the epoxy resin material, which would reduce insulation performance, cause product breakdown failure, and line operation failure.

[0003] Currently, the metal cleaning agents commonly used in the industry are mainly organic solvent systems represented by chlorinated hydrocarbons. These cleaning agents have strong dissolving and cleaning capabilities, but they have the following problems: (1) They are highly volatile and pose potential hazards to the respiratory system and skin of operators. Long-term exposure may lead to occupational health risks; (2) The evaporation and emission of solvents will cause air pollution. Some chlorinated hydrocarbons also have the potential effect of destroying the ozone layer, which does not meet the requirements of current environmental protection policies; (3) The cleaning waste liquid cannot be directly discharged and needs to be professionally collected and treated as hazardous waste, which increases production costs and management burden.

[0004] While existing water-based systems offer advantages such as environmental friendliness and high safety, they often suffer from problems like high foaming volume and difficulty in rinsing while improving cleaning capabilities. This makes it difficult to achieve an effective balance between cleaning power and low foaming performance, and thus fails to meet the stringent cleanliness requirements of high-voltage / ultra-high-voltage insulation components.

[0005] Therefore, there is an urgent need to develop a water-based metal cleaning agent that combines excellent cleaning effect with low foaming properties. Summary of the Invention

[0006] This invention proposes a water-based metal cleaning agent that is environmentally friendly, non-toxic and harmless, has excellent cleaning effect on metal surfaces, and also has excellent low-foaming properties, making it easy to rinse clean.

[0007] The present invention also proposes a method for preparing the water-based metal cleaning agent.

[0008] The present invention also proposes the application of the water-based metal cleaning agent.

[0009] The first aspect of this invention relates to a water-based metal cleaning agent, comprising water, a preservative, and the following raw materials by mass percentage: nonionic surfactant A 0.1%~0.3%, nonionic surfactant B 4%~6%, isooctanol polyoxyethylene ether phosphate 0.2%~0.5%, and a chelating agent 1%~3%; wherein the nonionic surfactant A is selected from at least one of nonylphenol polyoxyethylene ether and octylphenol polyoxyethylene ether, and the number of oxyethylene units in the molecular structure is 6~8; wherein the nonionic surfactant B is selected from at least one of coconut oil fatty acid diethanolamide and coconut oil fatty acid monoethanolamide.

[0010] The water-based metal cleaning agent according to the first aspect of the present invention has at least the following beneficial effects: The molecular structure of nonionic surfactant A contains hydrophobic nonylphenol and / or octylphenol groups, as well as hydrophilic ethylene oxide segments, with 6 to 8 ethylene oxide units. While maintaining good water solubility, it can fully exert emulsification, dispersion and detergency during the cleaning process, thereby improving the cleaning ability of oil stains on metal surfaces.

[0011] Nonionic surfactant B has good solubility. When used in conjunction with nonionic surfactant A, it can improve the wetting and stripping ability of the cleaning agent on oil stains, thereby increasing overall cleaning efficiency. Furthermore, nonionic surfactant B can reduce foam stability and foam formation, which facilitates subsequent rinsing and reduces the adverse effects of cleaning residue on electrical properties.

[0012] Isooctyl alcohol polyoxyethylene ether phosphate ester ionizes in water to generate negatively charged active ions, exhibiting excellent emulsifying, dispersing, wetting, and penetrating properties. Its polarized groups adsorb onto oil stains on metal surfaces, while its hydrophilic groups interact with the aqueous phase, gradually dispersing the oil stains and causing them to peel off from the metal surface. This phosphate ester anionic surfactant synergistically enhances the effect with two types of nonionic surfactants, further improving the interfacial tension of the solution, making it easier for the cleaning solution to wet the metal surface, and promoting the desorption of oil stains from the metal surface under external forces such as stirring and vibration.

[0013] Chelating agents can complex metal ions, enhance the stability of cleaning solutions, reduce dirt adhesion, and further improve cleaning performance.

[0014] Through the combination of the above components, the cleaning agent of the present invention not only has excellent metal surface cleaning ability, but also has good low foaming and easy rinsing properties, making it particularly suitable for cleaning metal inserts in high-voltage / ultra-high-voltage electrical insulation components where strict interface cleanliness requirements are required.

[0015] According to some embodiments of the present invention, the number of oxyethylene units in the isooctanol polyoxyethylene ether phosphate is 3 to 15, and more specifically 6 to 8, which can better balance solubility and cleaning ability.

[0016] According to some embodiments of the present invention, the isooctanol polyoxyethylene ether phosphate is prepared by the following method: under stirring conditions, phosphorus pentoxide is added to isooctanol polyoxyethylene ether, heated to react, and hydrolyzed to obtain the product. The molar ratio of isooctanol polyoxyethylene ether to phosphorus pentoxide is 2-3:1, for example, 2:1, 2.5:1, or 3:1. By controlling the raw material ratio, a product mainly composed of monoesters is generated, improving permeability and further enhancing the cleaning effect.

[0017] According to some embodiments of the present invention, the feeding rate of phosphorus pentoxide is 5-10 g / min, for example 5 g / min, 8 g / min or 10 g / min. By slowly feeding, the instantaneous local concentration of the raw material is reduced, side reactions are minimized, and the formation of the target product, mainly composed of monoesters, is facilitated.

[0018] According to some embodiments of the present invention, the feeding temperature of phosphorus pentoxide is 35~45°C, for example 35°C, 40°C or 45°C, to ensure that phosphorus pentoxide is fully dispersed while avoiding excessively high temperature that could lead to excessively rapid reaction or an increase in local side reactions.

[0019] According to some embodiments of the present invention, the temperature of the heating reaction is 65~75°C, for example 65°C, 70°C or 75°C.

[0020] According to some embodiments of the present invention, the heating reaction time is 3 to 5 hours, for example 3 hours, 4 hours or 5 hours.

[0021] According to some embodiments of the present invention, the amount of water added during hydrolysis is 2% to 5% of the mass of the isooctanol polyoxyethylene ether, for example, 2%, 3%, 4% or 5%. Hydrolysis can convert the polyphosphate ester formed in the reaction into a monoester.

[0022] According to some embodiments of the present invention, the hydrolysis temperature is 70~80°C, for example 70°C, 75°C or 80°C.

[0023] According to some embodiments of the present invention, the hydrolysis time is 1 to 2 hours, for example 1 hour, 1.5 hours or 2 hours.

[0024] According to some embodiments of the present invention, the chelating agent is selected from at least one of iminodisuccinic acid, aspartic acid diethoxysuccinic acid and N-carboxyethyl ethylenediamine triacetic acid, all of which are environmentally friendly chelating agents that are completely biodegradable. The degradation products are amino acids and nutrients, which are environmentally friendly.

[0025] According to some embodiments of the present invention, the chelating agent is 2% to 3% by mass, for example, 2%, 2.5% or 3%.

[0026] According to some embodiments of the present invention, the preservative is selected from sodium metavanadate. Compared with commonly used benzotriazole organic preservatives, sodium metavanadate has lower skin irritation and is more environmentally friendly and safer.

[0027] According to some embodiments of the present invention, the preservative is present in a mass percentage of 0.005% to 0.05%, for example 0.005% to 0.02%, more specifically 0.005%, 0.01%, 0.015% or 0.02%.

[0028] According to some embodiments of the present invention, the water mass percentage is 90.5% to 94%, for example 90.5%, 91%, 91.5%, 92%, 92.5%, 93%, 93.5% or 94%.

[0029] According to some embodiments of the present invention, the nonionic surfactant A is 0.15% to 0.25% by mass, for example 0.15%, 0.2% or 0.25%.

[0030] According to some embodiments of the present invention, the nonionic surfactant B has a mass percentage of 5% to 6%, for example 5%, 5.5% or 6%.

[0031] According to some embodiments of the present invention, the water-based metal cleaning agent meets the following conditions, and the test standard is JB / T 4323-2019: Cleaning ability for artificial oil stains ≥93%; Cleaning capacity for hydraulic oil contaminants ≥96%; Defoaming capacity ≤1mm.

[0032] The second aspect of the present invention relates to a method for preparing the water-based metal cleaning agent, comprising: mixing all the raw materials to obtain the cleaning agent.

[0033] This invention does not limit the specific mixing method. For example, two nonionic surfactants can be dissolved in water first, and then the remaining components can be added and mixed. During the mixing process, stirring or appropriate heating can be used as needed to improve the dissolution and dispersion efficiency. Specific operating conditions can be adjusted according to actual process requirements and experience.

[0034] The third aspect of this invention relates to the application of the aforementioned water-based metal cleaning agent in metal cleaning. Specifically, this cleaning agent is particularly suitable for cleaning metal inserts in high-voltage / ultra-high-voltage electrical insulation components to remove surface oil and impurities and improve interface cleanliness.

[0035] In this article, the numerical ranges mentioned include the endpoints and any subsets within that range.

[0036] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Detailed Implementation

[0037] The embodiments of the present invention are described in detail below. These embodiments are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0038] The raw materials used in the following examples and comparative examples are described below: Nonylphenol polyoxyethylene ether and octylphenol polyoxyethylene ether: ethylene oxide number 6-8, purchased from Sasol (China) Chemical Co., Ltd.

[0039] Coconut oil fatty acid diethanolamide (C 11 H 23 CON(CH2CH2OH)2), coconut oil fatty acid monoethanolamide (C 11 H 23 CONHCH2CH2OH was purchased from Hubei Zhongnuo Yaxing Biotechnology Co., Ltd.

[0040] Isooctyl alcohol polyoxyethylene ether is prepared according to the following method: Isooctyl alcohol polyoxyethylene ether (oxyethylene number 6) at approximately 35°C was placed on a stirring table. Phosphorus pentoxide was added at a rate of 8 ± 2 g / min under stirring at 300 rpm, resulting in a molar ratio of isooctyl alcohol polyoxyethylene ether to phosphorus pentoxide of 2:1. After the addition was complete, the temperature was raised to approximately 75°C, and the esterification reaction was carried out for 5 hours. Subsequently, 3%–4% water (by weight of isooctyl alcohol polyoxyethylene ether) was added, and the temperature was controlled at 75 ± 5°C for a reaction time of 1.5 hours to obtain the final product.

[0041] Unless otherwise specified, all raw materials or equipment mentioned are commercially available and readily available.

[0042] Example 1 The water-based cleaning agent in this embodiment comprises, by weight, 0.25 parts of nonylphenol polyoxyethylene ether, 5 parts of coconut oil fatty acid diethanolamide, 0.2 parts of isooctanol polyoxyethylene ether phosphate, 2 parts of iminodisuccinic acid, 0.01 parts of sodium metavanadate, and 92.54 parts of deionized water.

[0043] The preparation method of the above-mentioned water-based cleaning agent includes the following steps: 1) Weigh 92.54 wt% of 35~40℃ deionized water and place it on a magnetic stirring table. Set the speed to 100 r / min. Add 0.25 wt% nonylphenol polyoxyethylene ether and 5 wt% coconut oil fatty acid diethanolamide in sequence. Increase the stirring speed to 150~200 r / min and stir until uniform. 2) Reduce the stirring speed to 100 r / min, and add 0.2 wt% isooctyl alcohol polyoxyethylene ether phosphate, 2 wt% iminodisuccinic acid, and 0.01 wt% sodium metavanadate in sequence, and stir at 150~200 r / min until uniform.

[0044] Example 2 The water-based cleaning agent of this embodiment comprises, by weight, 0.25 parts of octylphenol polyoxyethylene ether, 3 parts of coconut oil fatty acid diethanolamide, 2 parts of coconut oil fatty acid monoethanolamide, 0.3 parts of isooctanol polyoxyethylene ether phosphate, 2 parts of iminodisuccinic acid, 0.01 parts of sodium metavanadate, and 92.44 parts of deionized water.

[0045] The preparation method of the above-mentioned water-based cleaning agent includes the following steps: 1) Weigh 92.44 wt% of 35~40℃ deionized water and place it on a magnetic stirring table. Set the speed to 100 r / min. Add 0.25 wt% octylphenol polyoxyethylene ether, 3 wt% coconut oil fatty acid diethanolamide, and 2 wt% coconut oil fatty acid monoethanolamide in sequence. Increase the stirring speed to 150~200 r / min and stir until uniform. 2) Reduce the stirring speed to 100 r / min, and add 0.3 wt% isooctyl alcohol polyoxyethylene ether phosphate, 2 wt% iminodisuccinic acid, and 0.01 wt% sodium metavanadate in sequence, and stir at 150~200 r / min until uniform.

[0046] Example 3 The water-based cleaning agent of this embodiment comprises, by weight, 0.1 parts of nonylphenol polyoxyethylene ether, 0.1 parts of octylphenol polyoxyethylene ether, 3 parts of coconut oil fatty acid diethanolamide, 2 parts of coconut oil fatty acid monoethanolamide, 0.4 parts of isooctanol polyoxyethylene ether phosphate, 3 parts of aspartic acid diethoxysuccinic acid, 0.01 parts of sodium metavanadate, and 91.39 parts of deionized water.

[0047] The preparation method of the above-mentioned water-based cleaning agent includes the following steps: 1) Weigh 91.39 wt% of 35~40℃ deionized water and place it on a magnetic stirring table. Set the speed to 100 r / min. Add 0.1 wt% nonylphenol polyoxyethylene ether, 0.1 wt% octylphenol polyoxyethylene ether, 3 wt% coconut oil fatty acid diethanolamide, and 2 wt% coconut oil fatty acid monoethanolamide in sequence. Increase the stirring speed to 150~200 r / min and stir until uniform. 2) Reduce the stirring speed to 100 r / min, and add 0.4 wt% isooctyl alcohol polyoxyethylene ether phosphate, 3 wt% aspartic acid diethoxysuccinic acid, and 0.01 wt% sodium metavanadate in sequence, and stir at 150~200 r / min until uniform.

[0048] Example 4 The water-based cleaning agent of this embodiment comprises, by weight, 0.1 parts of nonylphenol polyoxyethylene ether, 0.1 parts of octylphenol polyoxyethylene ether, 3 parts of coconut oil fatty acid diethanolamide, 3 parts of coconut oil fatty acid monoethanolamide, 0.4 parts of isooctanol polyoxyethylene ether phosphate, 3 parts of N-carboxyethyl ethylenediamine triacetic acid, 0.01 parts of sodium metavanadate, and 90.39 parts of deionized water.

[0049] The preparation method of the above-mentioned water-based cleaning agent includes the following steps: 1) Weigh 90.39wt% of 35~40℃ deionized water and place it on a magnetic stirring table. Set the speed to 100r / min. Add 0.1wt% nonylphenol polyoxyethylene ether, 0.1wt% octylphenol polyoxyethylene ether, 3wt% coconut oil fatty acid diethanolamide, and 3wt% coconut oil fatty acid monoethanolamide in sequence. Increase the stirring speed to 150~200r / min and stir until uniform. 2) Reduce the stirring speed to 100 r / min, and add 0.4 wt% isooctyl alcohol polyoxyethylene ether phosphate, 3 wt% N-carboxyethyl ethylenediamine triacetic acid, and 0.01 wt% sodium metavanadate in sequence, and stir at 150~200 r / min until uniform.

[0050] Example 5 The water-based cleaning agent of this embodiment comprises, by weight, 0.1 parts of nonylphenol polyoxyethylene ether, 0.1 parts of octylphenol polyoxyethylene ether, 5 parts of coconut oil fatty acid monoethanolamide, 0.5 parts of isooctanol polyoxyethylene ether phosphate, 2 parts of N-carboxyethyl ethylenediamine triacetic acid, 0.01 parts of sodium metavanadate, and 92.29 parts of deionized water.

[0051] The preparation method of the above-mentioned water-based cleaning agent includes the following steps: 1) Weigh 92.29 wt% of 35~40℃ deionized water and place it on a magnetic stirring table. Set the speed to 100 r / min. Add 0.1 wt% nonylphenol polyoxyethylene ether, 0.1 wt% octylphenol polyoxyethylene ether, and 5 wt% coconut oil fatty acid monoethanolamide in sequence. Increase the stirring speed to 150~200 r / min and stir until uniform. 2) Reduce the stirring speed to 100 r / min, and add 0.5 wt% isooctyl alcohol polyoxyethylene ether phosphate, 2 wt% N-carboxyethyl ethylenediamine triacetic acid, and 0.01 wt% sodium metavanadate in sequence, and stir at a speed of 150~200 r / min until uniform.

[0052] Example 6 The water-based cleaning agent of this embodiment comprises, by weight, 0.1 parts of nonylphenol polyoxyethylene ether, 0.1 parts of octylphenol polyoxyethylene ether, 3 parts of coconut oil fatty acid diethanolamide, 2 parts of coconut oil fatty acid monoethanolamide, 0.5 parts of isooctanol polyoxyethylene ether phosphate, 2 parts of iminodisuccinic acid, 0.01 parts of sodium metavanadate, and 92.29 parts of deionized water.

[0053] The preparation method of the above-mentioned water-based cleaning agent includes the following steps: 1) Weigh 92.29 wt% of deionized water at 35~40℃ and place it on a magnetic stirring table. Set the speed to 100 r / min. Add 0.1 wt% nonylphenol polyoxyethylene ether, 0.1 wt% octylphenol polyoxyethylene ether, 3 wt% coconut oil fatty acid diethanolamide, and 2 wt% coconut oil fatty acid monoethanolamide in sequence. Increase the stirring speed to 150~200 r / min and stir until uniform. 2) Reduce the stirring speed to 100 r / min, and add 0.5 wt% isooctyl alcohol polyoxyethylene ether phosphate, 2 wt% iminodisuccinic acid, and 0.01 wt% sodium metavanadate in sequence, stirring at 150~200 r / min until uniform.

[0054] Example 7 This embodiment relates to a water-based metal cleaning agent, which comprises, by weight parts: 0.1 parts nonylphenol polyoxyethylene ether, 0.1 parts octylphenol polyoxyethylene ether, 3 parts coconut oil fatty acid diethanolamide, 2 parts coconut oil fatty acid monoethanolamide, 0.4 parts isooctanol polyoxyethylene ether phosphate, 3 parts ethylenediaminetetraacetic acid, 0.01 parts sodium metavanadate, and 91.39 parts deionized water.

[0055] The preparation method of the above-mentioned water-based metal cleaning agent includes the following steps: Weigh 91.39 wt% of deionized water at 35-40℃ and place it on a magnetic stirring table. Set the speed to 100 r / min. Add 0.1 wt% nonylphenol polyoxyethylene ether, 0.1 wt% octylphenol polyoxyethylene ether, 3 wt% coconut oil fatty acid diethanolamide, 2 wt% coconut oil fatty acid monoethanolamide, 0.4 wt% isooctyl alcohol polyoxyethylene ether phosphate, 3 wt% ethylenediaminetetraacetic acid, and 0.01 wt% sodium metavanadate in sequence. Stir at 150-200 r / min until homogeneous.

[0056] Comparative Example 1 The metal cleaning agent involved in this comparative example comprises, by weight parts: 0.1 parts nonylphenol polyoxyethylene ether, 0.1 parts octylphenol polyoxyethylene ether, 0.4 parts isooctanol polyoxyethylene ether phosphate, 2 parts iminodisuccinic acid, 0.01 parts sodium metavanadate, and 97.39 parts deionized water.

[0057] The preparation method of the above-mentioned metal cleaning agent includes the following steps: Weigh 97.39 wt% of deionized water at 35-40℃ and place it on a magnetic stirring table. Set the speed to 100 r / min. Add 0.1 wt% nonylphenol polyoxyethylene ether, 0.1 wt% octylphenol polyoxyethylene ether, 0.4 wt% isooctanol polyoxyethylene ether phosphate, 2 wt% iminodisuccinic acid, and 0.01 wt% sodium metavanadate in sequence. Increase the stirring speed to 150-200 r / min and stir until homogeneous. Comparative Example 2 The metal cleaning agent involved in this comparative example comprises, by weight parts: 3 parts coconut oil fatty acid diethanolamide, 2 parts coconut oil fatty acid monoethanolamide, 0.4 parts isooctyl alcohol polyoxyethylene ether phosphate, 2 parts iminodisuccinic acid, 0.01 parts sodium metavanadate, and 92.59 parts deionized water.

[0058] The preparation method of the above-mentioned metal cleaning agent includes the following steps: Weigh 92.59 wt% of deionized water at 35-40℃ and place it on a magnetic stirring table. Set the speed to 100 r / min. Add 3 wt% coconut oil fatty acid diethanolamide, 2 wt% coconut oil fatty acid monoethanolamide, 0.4 wt% isooctyl alcohol polyoxyethylene ether phosphate, 2 wt% iminodisuccinic acid, and 0.01 wt% sodium metavanadate in sequence. Increase the stirring speed to 150-200 r / min and stir until uniform.

[0059] Comparative Example 3 The metal cleaning agent involved in this comparative example comprises, by weight, 0.25 parts of nonylphenol polyoxyethylene ether, 5 parts of coconut oil fatty acid diethanolamide, 2 parts of iminodisuccinic acid, 0.01 parts of sodium metavanadate, and 92.74 parts of deionized water.

[0060] The preparation method of the above-mentioned metal cleaning agent includes the following steps: Weigh 92.74 wt% of 35-40℃ deionized water and place it on a magnetic stirring table. Set the speed to 100 r / min. Add 0.25 wt% nonylphenol polyoxyethylene ether, 5 wt% coconut oil fatty acid diethanolamide, 2 wt% iminodisuccinic acid, and 0.01 wt% sodium metavanadate in sequence. Increase the stirring speed to 150-200 r / min and stir until uniform. Comparative Example 4 This comparative example relates to a metal cleaning agent, which, by weight, comprises: 0.25 parts dodecyl alcohol polyoxyethylene ether, 3 parts coconut oil fatty acid diethanolamide, 2 parts coconut oil fatty acid monoethanolamide, 0.4 parts isooctyl alcohol polyoxyethylene ether phosphate, 3 parts aspartic acid diethoxysuccinic acid, 0.01 parts sodium metavanadate, and 91.34 parts deionized water. The dodecyl alcohol polyoxyethylene ether has an ethylene oxide number of 9 and was purchased from BASF AG.

[0061] The preparation method of the above-mentioned metal cleaning agent includes the following steps: Weigh 91.34 wt% of deionized water at 35-40℃ and place it on a magnetic stirring table. Set the speed to 100 r / min. Add 0.25 wt% dodecyl alcohol polyoxyethylene ether, 3 wt% coconut oil fatty acid diethanolamide, 2 wt% coconut oil fatty acid monoethanolamide, 0.4 wt% isooctyl alcohol polyoxyethylene ether phosphate, 3 wt% aspartic acid diethoxysuccinic acid, and 0.01 wt% sodium metavanadate in sequence. Stir at 150-200 r / min until homogeneous.

[0062] Comparative Example 5 The metal cleaning agent involved in this comparative example comprises, by weight, 0.2 parts of isooctanol polyoxyethylene ether phosphate, 6 parts of sodium dodecylbenzenesulfonate, 2 parts of ethylenediaminetetraacetic acid, 0.01 parts of sodium metavanadate, and 91.79 parts of deionized water.

[0063] The preparation method of the above-mentioned metal cleaning agent includes the following steps: Weigh 91.79 wt% of deionized water at 35-40℃ and place it on a magnetic stirring table. Set the speed to 100 r / min. Add 0.2 wt% dodecyl polyoxyethylene ether, 6 wt% sodium dodecylbenzenesulfonate, 2 wt% ethylenediaminetetraacetic acid, and 0.01 wt% sodium metavanadate in sequence. Increase the stirring speed to 150-200 r / min and stir until homogeneous. Test case I. Cleaning Capability Test (Mass Method) According to the mechanical industry standard JB / T 4323-2019, the cleaning ability of artificial oil stains and Kunlun brand L-HL46 anti-oxidation and anti-rust hydraulic oil was tested respectively. The composition and preparation method of artificial oil stains are as follows: 50wt% Kunlun brand L-HL32 anti-oxidation and anti-rust hydraulic oil, 25wt% industrial white petroleum jelly, and 25wt% barium petroleum sulfonate were stirred and mixed evenly at 120℃ and cooled to room temperature before use.

[0064] II. Corrosion Test According to the mechanical industry standard JB / T 4323-2019, the test piece is made of H62 brass and 2Al2 hard aluminum, with a size of 25*50*5mm.

[0065] III. Rust Resistance Test According to the mechanical industry standard JB / T 4323-2019, H62 brass and 2Al2 hard aluminum test pieces with dimensions of 50×50×5 mm were used. Sixteen 10×10 mm squares were drawn on the surface of the test piece using a special pencil. Then, a Φ4 round-tipped glass rod was used to accurately drop the test solution into three squares, one drop per square. Each drop was approximately 4-5 mm in diameter immediately after being dropped. The test piece was placed on a partition in a humidification tank, which was a glass desiccator with a diameter of approximately 300 mm, and 800-1000 mL of distilled water was poured into the bottom. After covering, the tank was placed at a constant temperature of 35±2℃ for 24 hours. The test piece was then removed to observe whether corrosion appeared in the droplet area.

[0066] IV. Defoaming performance test According to the mechanical industry standard JB / T 4323-2019, preheat the prepared test solution to 30±2℃, pour it into a 100mL stoppered graduated cylinder, with the liquid level 70mm from the bottom of the stopper. Stopper the cylinder and place it in a constant-temperature electric drying oven at 30±2℃ for 10 minutes. Immediately afterward, shake the cylinder up and down for 1 minute, with a shaking distance of approximately 0.33m and a frequency of approximately (100~110) times / min. After shaking, open the stopper and place the graduated cylinder containing the test solution in the constant-temperature electric drying oven at 30±2℃ for 10 minutes. Observe the disappearance of foam and record the height of residual foam (which should be the average of the high and low peak values).

[0067] The test results are shown in Table 1.

[0068] Table 1

[0069] As shown in Table 1, the water-based metal cleaning agents prepared in Examples 1 to 6 all have excellent cleaning effect, corrosion resistance and rust prevention properties, and low foaming characteristics. They can be effectively applied to actual metal cleaning, and are particularly suitable for cleaning metal inserts in high-voltage / ultra-high-voltage electrical insulation components where strict interface cleanliness requirements are required.

[0070] In Example 7, the chelating agent was replaced with a cleaning agent containing ethylenediaminetetraacetic acid. Its cleaning effect was comparable to that of Examples 1-6. However, the chelating agent used in Examples 1-6 was a completely biodegradable and environmentally friendly chelating agent. The degradation products were amino acids and nutrients, which were environmentally friendly.

[0071] Comparative Example 1, which did not contain coconut oil fatty acid diethanolamide and coconut oil fatty acid monoethanolamide, had a poor cleaning effect and a high foaming amount; Comparative Example 2, which did not contain nonylphenol polyoxyethylene ether and octylphenol polyoxyethylene ether, had a poor cleaning effect on oil stains on metal surfaces; and Comparative Example 3, which did not contain anionic surfactants, had the worst cleaning effect.

[0072] Comparative Example 4 was a test in which nonionic surfactant B was replaced with dodecyl alcohol polyoxyethylene ether. The cleaning effect was significantly reduced, mainly because the increase in carbon chain and number of oxyethyl groups weakened the emulsification, dispersion and wetting effects.

[0073] Comparative Example 5 used sodium dodecylbenzenesulfonate as an anionic surfactant, resulting in a higher foam production.

[0074] The present invention has been described in detail above with reference to the embodiments. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A water-based metal cleaning agent, characterized in that, Includes water, preservatives, and the following raw materials by weight percentage: Nonionic surfactant A 0.1%~0.3%, nonionic surfactant B 4%~6%, isooctanol polyoxyethylene ether phosphate 0.2%~0.5%, chelating agent 1%~3%; The nonionic surfactant A is selected from at least one of nonylphenol polyoxyethylene ether and octylphenol polyoxyethylene ether, and the number of oxyethylene units in the molecular structure is 6 to 8. The nonionic surfactant B is selected from at least one of coconut oil fatty acid diethanolamide and coconut oil fatty acid monoethanolamide.

2. The water-based metal cleaning agent according to claim 1, characterized in that, The isooctanol polyoxyethylene ether phosphate has 3 to 15 oxyethylene units.

3. The water-based metal cleaning agent according to claim 1, characterized in that, The isooctanol polyoxyethylene ether phosphate is prepared by the following method: under stirring conditions, phosphorus pentoxide is added to isooctanol polyoxyethylene ether, heated to react, and hydrolyzed to obtain the product, wherein the molar ratio of isooctanol polyoxyethylene ether to phosphorus pentoxide is 2~3:

1.

4. The water-based metal cleaning agent according to claim 3, characterized in that, The feeding rate of phosphorus pentoxide is 5-10 g / min; and / or, the feeding temperature of phosphorus pentoxide is 35-45°C; and / or, the heating reaction temperature is 65-75°C; and / or, the heating reaction time is 3-5 h; and / or, the amount of water added for hydrolysis is 2%-5% of the mass of isooctanol polyoxyethylene ether; and / or, the hydrolysis temperature is 70-80°C; and / or, the hydrolysis time is 1-2 h.

5. The water-based metal cleaning agent according to claim 1, characterized in that, The chelating agent is selected from at least one of iminodisuccinic acid, aspartic acid diethoxysuccinic acid and N-carboxyethyl ethylenediamine triacetic acid; and / or, the chelating agent has a mass percentage of 2% to 3%.

6. The water-based metal cleaning agent according to claim 1, characterized in that, The preservative is selected from sodium metavanadate; and / or, the preservative has a mass percentage of 0.005% to 0.05%.

7. The water-based metal cleaning agent according to claim 1, characterized in that, The water comprises 90.5% to 94% by mass; and / or the nonionic surfactant A comprises 0.15% to 0.25% by mass; and / or the nonionic surfactant B comprises 5% to 6% by mass.

8. The water-based metal cleaning agent according to claim 1, characterized in that, The water-based metal cleaning agent meets the following conditions, and the test standard is JB / T 4323-2019: Cleaning ability for artificial oil stains ≥93%; Cleaning capacity for hydraulic oil contaminants ≥96%; Defoaming capacity ≤1mm.

9. A method for preparing the water-based metal cleaning agent according to any one of claims 1-8, characterized in that, include: Mix all the raw materials together to obtain the final product.

10. The application of the water-based metal cleaning agent according to any one of claims 1-8 in metal cleaning.

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