Aluminum alloy cleaning agent, preparation method and application thereof

Abstract

The present application relates to a kind of aluminum alloy cleaning agent and its preparation method and application, aluminum alloy cleaning agent includes by weight percentage: chelating agent 0.1-0.5%, surfactant 4-8%, cleaning additive 6-12%, monobasic acid 5-10%, solubilizing agent 3-5%, the rest is water;Its advantages are that, using different surfactant fatty acid methyl ester ethoxylate and C9-11 ethoxylated alcohol: coconut alkyl quaternary amine ethoxylate mixture compound use, give consideration to wetting, emulsification, oil removal etc., not only clean thoroughly to the oil dirt on the surface of aluminum alloy, and the cleaning agent of the present application does not add aluminum corrosion inhibitor, strong alkali additive, does not contain phosphorus and silicon, friendly to environment, no corrosion to aluminum alloy, no residue, will not affect the performance of aluminum alloy, reduce the harm to human body, and wastewater treatment pressure, in the application of cleaning oil dirt on the surface of aluminum alloy and improving the service life of aluminum alloy cleaning agent has important value.

Description

Technical Field

[0001] This invention relates to the field of cleaning agent technology, specifically to an aluminum alloy cleaning agent, its preparation method, and its application. Background Technology

[0002] Aluminum alloys are an important material widely used in aerospace, automotive manufacturing, and electronic equipment industries. However, aluminum alloys have relatively low hardness, and subsequent processing generally requires methods such as electroplating, anodizing, phosphating, and spraying to improve their hardness, wear resistance, and corrosion resistance. During the forming process of aluminum alloys, the surface can become contaminated with various oil stains. Therefore, it is necessary to clean the surface before post-processing to remove oil stains, oxide films, and other impurities.

[0003] The earliest cleaning methods used organic solvents to remove oil stains, but these solvents are flammable and harmful to human health and the environment. Other methods employed the saponification effect of strong alkaline solutions, but these solutions were ineffective at cleaning mineral oils, highly irritating to human skin, and corrosive to aluminum alloys. Therefore, current technologies have developed cleaning agents that primarily achieve cleaning through a combination of cleaning aids and surfactants.

[0004] Due to their amphoteric nature, aluminum alloys react with both strong acids and alkalis. Therefore, cleaning agents with weak alkalinity are typically used. However, existing alkaline additives can corrode aluminum, necessitating the addition of aluminum corrosion inhibitors during formulation. Commonly used aluminum alloy corrosion inhibitors are typically silicon-based or phosphate-based. However, because aluminum alloy surfaces have numerous micropores and voids, silicon-based inhibitors can easily adhere to these pores and remain on the surface, affecting subsequent performance improvements. Furthermore, adding phosphorus and silicon to cleaning agents increases the burden on wastewater treatment, while adding strong alkalis may pose health risks. Single surfactants are not ideal for cleaning, and some surfactants are not easily soluble in water-based formulations, impacting cleaning agent production efficiency.

[0005] There are currently no effective solutions to the problems existing in the relevant technologies, such as the damage to human skin caused by the addition of strong alkaline additives to cleaning agents, the impact on the performance of aluminum alloys caused by the addition of corrosion inhibitors to cleaning agents, the environmental hazards caused by the presence of phosphorus and silicon in cleaning agents and the increase in wastewater treatment pressure, the incomplete cleaning with a single surfactant, and the impact on the production efficiency of cleaning agents due to the poor solubility of surfactants. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of existing technologies by providing an aluminum alloy cleaning agent, its preparation method, and its application. This addresses the problems in related technologies, such as the harmful effects of adding strong alkaline additives to cleaning agents on human skin, the impact of adding corrosion inhibitors on aluminum alloy performance, the environmental hazards and increased wastewater treatment pressure caused by phosphorus and silicon in cleaning agents, incomplete cleaning with single surfactants, and the impact of surfactants on cleaning agent production efficiency due to poor solubility.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] In a first aspect, an aluminum alloy cleaning agent is provided, comprising, by weight percentage, the following components:

[0009] Chelating agent, 0.1-0.5%;

[0010] Surfactant, 4-8%;

[0011] Cleaning aid, 6-12%;

[0012] Monocarboxylic acid, 5-10%;

[0013] Solubilizer, 3-5%;

[0014] Water, remaining amount.

[0015] In some of these embodiments, the chelating agent includes one or more of disodium ethylenediaminetetraacetate, tetrasodium ethylenediaminetetraacetate, hydroxyethylidene diphosphonic acid, ethylenediaminetetramethylenephosphonic acid, and sodium gluconate.

[0016] In some embodiments, the surfactant includes one or more of nonionic surfactants, anionic surfactants, cationic surfactants, and nonionic / cationic amphoteric surfactants. The nonionic surfactants include fatty acid methyl ester ethoxylates, fatty alcohol EO-PO block polyethers, isomeric tridecyl alcohol polyoxyethylene ethers, and rosin-modified derivatives. The anionic surfactants include sodium dodecylbenzene sulfonate. The cationic surfactants include polyquaternary ammonium salts. The amphoteric surfactants include a mixture of C9-11 ethoxylated alcohols and coconut alkyl quaternary ammonium ethoxylates.

[0017] In some of these embodiments, the surfactant is composed of nonionic surfactants and amphoteric surfactants.

[0018] In some embodiments, the weight ratio of the nonionic surfactant to the amphoteric surfactant is 3-5:1.

[0019] In some of these embodiments, the weight ratio of the nonionic surfactant to the amphoteric surfactant is 3:1.

[0020] In some of these embodiments, the nonionic surfactant includes fatty acid methyl ester ethoxylates.

[0021] In some of these embodiments, the amphoteric surfactant comprises a mixture of C9-11 ethoxylated alcohols and coconut alkyl quaternary ammonium ethoxylates.

[0022] In some of these embodiments, the cleaning aid includes any two of sodium gluconate, sodium hydroxide, potassium carbonate, potassium hydroxide, triethanolamine, monoethanolamine, isopropanolamine, 2-amino-2-methyl-1-propanol, and dihydroxyethylcyclohexylamine.

[0023] In some of these embodiments, the cleaning aids include sodium gluconate and dihydroxyethylcyclohexylamine.

[0024] In some of these embodiments, the weight ratio of sodium gluconate to dihydroxyethylcyclohexylamine is 1-3:1.

[0025] In some of these embodiments, the weight ratio of sodium gluconate to dihydroxyethylcyclohexylamine is 2:1.

[0026] In some of these embodiments, the monocarboxylic acid includes one or more of gluconic acid, citric acid, boric acid, and aminosulfonic acid.

[0027] In some of these embodiments, the monocarboxylic acid is boric acid.

[0028] In some of these embodiments, the solubilizer comprises one or more of octanoic acid, isononanoic acid, neodecanoic acid, potassium polyether phosphate, and monosodium N-(2-hydroxyethyl)-N-(2-ethylhexyl)-β-alanine.

[0029] In some of the embodiments, the solubilizer is N-(2-hydroxyethyl)-N-(2-ethylhexyl)-β-alanine monosodium salt.

[0030] In a second aspect, a method for preparing an aluminum alloy cleaning agent is provided, for preparing the aluminum alloy cleaning agent as described in the first aspect, comprising:

[0031] S1: Heat half of the water to 20-70℃ according to the recipe;

[0032] S2: Add chelating agent and stir well;

[0033] S3: Add some surfactant, stir until completely dissolved, and continue stirring for 5-10 minutes to ensure the solution is homogeneous;

[0034] S4: Replenish with the remaining water;

[0035] S5: Add the remaining surfactant, cleaning aid, monobasic acid and solubilizer in sequence according to the formula. Stir for 5-10 minutes after each addition to ensure the solution is uniform and obtain a transparent solution, which is the cleaning agent.

[0036] In the above steps, the stirring speed is controlled at 1000-1500 r / min.

[0037] In some embodiments, the preparation method includes:

[0038] S1: Heat half of the water to 20-70℃ according to the recipe;

[0039] S2: Add chelating agent and stir well;

[0040] S3: Add nonionic surfactant, stir until completely dissolved, and continue stirring for 5-10 minutes to ensure the solution is homogeneous;

[0041] S4: Replenish with the remaining water;

[0042] S5: Add the amphoteric surfactant, cleaning aid, monobasic acid and solubilizer in sequence according to the formula. Stir for 5-10 minutes after each addition to ensure the solution is uniform and obtain a transparent solution, which is the cleaning agent.

[0043] In the above steps, the stirring speed is controlled at 1000-1500 r / min.

[0044] In some embodiments, the preparation method includes:

[0045] S1: Heat half of the water to 50-60℃ according to the recipe;

[0046] S2: Add disodium ethylenediaminetetraacetate and stir until well mixed;

[0047] S3: Add fatty acid methyl ester ethoxylate, stir until completely dissolved, and continue stirring for 5-10 minutes to ensure the solution is homogeneous;

[0048] S4: Replenish with the remaining water;

[0049] S5: Add C9-11 ethoxylated alcohols in sequence according to the formula: coconut alkyl quaternary ammonium ethoxylate mixture, sodium gluconate, dihydroxyethylcyclohexylamine, boric acid, and N-(2-hydroxyethyl)-N-(2-ethylhexyl)-β-alanine monosodium salt. Stir for 5-10 minutes after each addition to ensure the solution is uniform and obtain a transparent solution, which is the cleaning agent.

[0050] In the above steps, the stirring speed is controlled at 1000-1500 r / min.

[0051] Thirdly, an application is provided for an aluminum alloy cleaning agent as described in the first aspect or an aluminum alloy cleaning agent prepared by the preparation method as described in the second aspect, characterized in that the application is selected from at least one of the following applications: application in cleaning oil stains on solid surfaces of aluminum alloys, and application in improving the cleaning life of the cleaning agent.

[0052] The present invention adopts the above technical solution and has the following technical effects compared with the prior art:

[0053] This invention discloses an aluminum alloy cleaning agent, its preparation method, and its application. The cleaning agent contains no aluminum corrosion inhibitors, is free of phosphorus and silicon, is environmentally friendly, non-corrosive to aluminum alloys, and leaves no residue. It avoids the risk of aluminum alloy corrosion after prolonged storage due to the failure of aluminum corrosion inhibitors. It solves the problems of adding corrosion inhibitors to cleaning agents affecting aluminum alloy performance, and the environmental hazards and increased wastewater treatment pressure caused by phosphorus and silicon in the cleaning agent. The cleaning agent of this invention does not contain strong alkaline additives, has a low pH, and is less harmful to the human body during cleaning, thus solving the problem of cleaning agents posing a health hazard to humans. By using a compound of different surfactants FMEE and 226SA, it takes into account wetting, emulsification, and degreasing effects, greatly improving the cleaning effect and the service life of the cleaning solution. Furthermore, by using water heating treatment, the dissolution of fatty acid methyl ester ethoxylate (FMEE) is accelerated, solving the problem of surfactants being difficult to dissolve during the production of the cleaning agent, and greatly improving the production efficiency of the cleaning agent. Attached Figure Description

[0054] Figure 1 These are the dyne pen test results of Comparative Example 4 and Example 7 according to embodiments of the present invention;

[0055] Figure 2 The corrosion test results are those of Comparative Example 7 and Example 7 according to embodiments of the present invention;

[0056] Figure 3 The results are from oil dissolution tests of Comparative Example 10 and Example 7 according to embodiments of the present invention. Detailed Implementation

[0057] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Experimental methods in the following embodiments that do not specify specific conditions are generally determined according to national standards. Experimental materials in the following embodiments that do not specify their source are all commercially available raw materials. The equipment used in each step of the following embodiments is conventional equipment. If there is no corresponding national standard, it is carried out according to general international standards, conventional conditions, or conditions recommended by the manufacturer. Unless otherwise stated, all parts are parts by weight, and all percentages are percentages by mass. Unless otherwise defined or stated, all professional and scientific terms used in the present invention have the same meaning as those skilled in the art. In addition, any methods and materials similar or equivalent to those described can be applied to the methods of the present invention.

[0058] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the scope of the invention.

[0059] Example 1

[0060] This embodiment relates to the aluminum alloy cleaning agent of the present invention.

[0061] An aluminum alloy cleaning agent, by weight percentage, comprises 0.1-0.5% chelating agent, 4-8% surfactant, 8-12% cleaning aid, 5-10% monobasic acid, 3-5% solubilizer, and the balance being water.

[0062] Preferably, the chelating agent includes one or more of the following: disodium ethylenediaminetetraacetate (EDTA·2Na), tetrasodium ethylenediaminetetraacetate (EDTA·4Na), hydroxyethylidene diphosphonic acid (HEDP), ethylenediaminetetramethylenephosphonic acid (EDTMPA), and sodium gluconate.

[0063] Preferably, the surfactant includes one or more of nonionic surfactants, anionic surfactants, cationic surfactants, and nonionic / cationic amphoteric surfactants. Among them, the nonionic surfactant includes fatty acid methyl ester ethoxylate (FMEE), fatty alcohol EO-PO block polyether (LF305), isomeric tridecyl alcohol polyoxyethylene ether (TO-8), and rosin modified derivative (MSC); the anionic surfactant includes sodium dodecylbenzene sulfonate (LAS); the cationic surfactant includes polyquaternary ammonium salt (WT); and the amphoteric surfactant includes a mixture of C9-11 ethoxylated alcohol: coconut alkyl quaternary ammonium ethoxylate (226SA).

[0064] Furthermore, the surfactants are composed of nonionic surfactants and amphoteric surfactants.

[0065] Furthermore, the weight ratio of the nonionic surfactant to the amphoteric surfactant is 3-5:1.

[0066] Furthermore, the weight ratio of the nonionic surfactant to the amphoteric surfactant is 3:1.

[0067] Furthermore, nonionic surfactants include fatty acid methyl ester ethoxylates.

[0068] Furthermore, the amphoteric surfactants include a mixture of C9-11 ethoxylated alcohols: coconut alkyl quaternary ammonium ethoxylates.

[0069] Furthermore, the cleaning aids include any two of sodium gluconate, sodium hydroxide, potassium carbonate, potassium hydroxide, triethanolamine, monoethanolamine, isopropanolamine, 2-amino-2-methyl-1-propanol, and dihydroxyethylcyclohexylamine.

[0070] Furthermore, the cleaning aids include sodium gluconate and dihydroxyethylcyclohexylamine.

[0071] Furthermore, the weight ratio of sodium gluconate to dihydroxyethylcyclohexylamine is 1-3:1.

[0072] Furthermore, the weight ratio of sodium gluconate to dihydroxyethylcyclohexylamine is 2:1.

[0073] Furthermore, monocarboxylic acids include one or more of gluconic acid, citric acid, boric acid, and aminosulfonic acid.

[0074] Furthermore, the monocarboxylic acid is boric acid.

[0075] Furthermore, the solubilizer includes one or more of the following: octanoic acid, isononanoic acid, neodecanoic acid, potassium salt of polyether phosphate, and monosodium salt of N-(2-hydroxyethyl)-N-(2-ethylhexyl)-β-alanine.

[0076] Furthermore, the solubilizer is N-(2-hydroxyethyl)-N-(2-ethylhexyl)-β-alanine monosodium salt.

[0077] Traditional aluminum alloy cleaning agents have the following drawbacks: the addition of strong alkaline additives can damage human skin; the addition of corrosion inhibitors can affect the performance of aluminum alloys; the presence of phosphorus and silicon in the cleaning agents can harm the environment and increase the pressure on wastewater treatment; and the cleaning is not thorough with a single surfactant.

[0078] Compared with the above-mentioned cleaning agents, the aluminum alloy cleaning agent of the present invention uses nonionic surfactants and amphoteric surfactants. The two surfactants work synergistically to ensure the cleaning efficiency of the cleaning agent. The chelating agent, cleaning aid, monobasic acid and solubilizer used do not contain strong alkaline additives, which reduces the harm to human skin. No corrosion inhibitors are added, so they will not affect the performance of aluminum alloys. It does not contain phosphorus and silicon, so it will not harm the environment or increase the pressure on wastewater treatment.

[0079] Example 2

[0080] This embodiment relates to the preparation method of the present invention.

[0081] A method for preparing an aluminum alloy cleaning agent, comprising:

[0082] S1: Heat half of the water to 20-70℃ according to the recipe;

[0083] S2: Add chelating agent and stir well;

[0084] S3: Add some surfactant, stir until completely dissolved, and continue stirring for 5-10 minutes to ensure the solution is homogeneous;

[0085] S4: Replenish with the remaining water;

[0086] S5: Add the remaining surfactant, cleaning aid, monobasic acid and solubilizer in sequence according to the formula. Stir for 5-10 minutes after each addition to ensure the solution is uniform and obtain a transparent solution, which is the cleaning agent.

[0087] In the above steps, the stirring speed is controlled at 1000-1500 r / min.

[0088] Preferably, in step S1, the heating temperature is 50-60°C.

[0089] In some of these embodiments, in step S1, the heating is performed at atmospheric pressure.

[0090] In some of these embodiments, in step S1, heating is carried out in a temperature-controlled reaction vessel.

[0091] In some of these embodiments, the surfactant in step S3 is a nonionic surfactant.

[0092] In some of these embodiments, the surfactant in step S5 is an amphoteric surfactant.

[0093] In related technologies, when preparing aluminum alloy cleaning agents, the surfactants are not easily dissolved, which affects the production efficiency of the cleaning agents.

[0094] Compared with existing cleaning agent preparation methods, the aluminum alloy cleaning agent preparation method of this embodiment uses a method of heating half of the formula water, which enables the surfactant to dissolve quickly without affecting the production efficiency of the cleaning agent. In addition, the preparation method of this embodiment uses simple equipment, controllable conditions, and simple and easy operation steps.

[0095] Example 3

[0096] This embodiment is a specific implementation of the present invention.

[0097] An aluminum alloy cleaning agent, as shown in Table 1, comprises the following raw materials in the following mass ratios: 0.1 parts disodium ethylenediaminetetraacetate (EDTA·2Na), 6 parts fatty acid methyl ester ethoxylate (FMEE), 2 parts C9-11 ethoxylated alcohol: coconut alkyl quaternary ammonium ethoxylate mixture (226SA), 5 parts sodium gluconate, 2 parts dihydroxyethylcyclohexylamine (CH020), 6 parts boric acid, 3 parts N-(2-hydroxyethyl)-N-(2-ethylhexyl)-β-alanine monosodium salt (LF70), and 75.9 parts water.

[0098] The preparation steps for this aluminum alloy cleaning agent are as follows:

[0099] 1) According to the formula, heat half of the water to 50-60℃ in a temperature-controlled reactor under normal pressure;

[0100] 2) Add the chelating agent disodium ethylenediaminetetraacetate (EDTA·2Na) and stir until homogeneous;

[0101] 3) Add fatty acid methyl ester ethoxylate (FMEE), stir until completely dissolved, and continue stirring for 5-10 minutes to ensure the solution is homogeneous;

[0102] 4) Replenish with the remaining water;

[0103] 5) Add C9-11 ethoxylated alcohols in sequence according to the formula: coconut alkyl quaternary ammonium ethoxylate mixture (226SA), sodium gluconate, dihydroxyethylcyclohexylamine (CH020), boric acid, and N-(2-hydroxyethyl)-N-(2-ethylhexyl)-β-alanine monosodium salt (LF70). Stir for 5-10 minutes after each addition to ensure the solution is uniform and obtain a transparent solution, which is the cleaning agent.

[0104] In the above steps, the stirring speed is controlled at 1000-1500 r / min.

[0105] Furthermore, the preferred stirring speed is 1300 r / min.

[0106] Example 4

[0107] This embodiment is a specific implementation of the present invention.

[0108] An aluminum alloy cleaning agent, as shown in Table 1, comprises the following raw materials in the following mass ratios: 0.1 parts disodium ethylenediaminetetraacetate (EDTA·2Na), 5 parts fatty acid methyl ester ethoxylate (FMEE), 2 parts C9-11 ethoxylated alcohol: coconut alkyl quaternary ammonium ethoxylate mixture (226SA), 4 parts sodium gluconate, 2 parts dihydroxyethylcyclohexylamine (CH020), 6 parts boric acid, 3 parts N-(2-hydroxyethyl)-N-(2-ethylhexyl)-β-alanine monosodium salt (LF70), and 77.9 parts water.

[0109] The preparation steps are the same as in Example 1.

[0110] Example 5

[0111] This embodiment is a specific implementation of the present invention.

[0112] An aluminum alloy cleaning agent, as shown in Table 1, comprises the following raw materials in parts by mass: 0.1 parts of disodium ethylenediaminetetraacetate (EDTA·2Na), 4 parts of fatty acid methyl ester ethoxylate (FMEE), 3 parts of C9-11 ethoxylated alcohol: coconut alkyl quaternary ammonium ethoxylate mixture (226SA), 8 parts of sodium gluconate, 4 parts of dihydroxyethylcyclohexylamine (CH020), 8 parts of boric acid, 5 parts of N-(2-hydroxyethyl)-N-(2-ethylhexyl)-β-alanine monosodium salt (LF70), and 67.9 parts of water.

[0113] The preparation steps are the same as in Example 1.

[0114] Example 6

[0115] This embodiment is a specific implementation of the present invention.

[0116] An aluminum alloy cleaning agent, as shown in Table 1, comprises the following raw materials in the following mass ratios: 0.1 parts disodium ethylenediaminetetraacetate (EDTA·2Na), 3 parts fatty acid methyl ester ethoxylate (FMEE), 3 parts C9-11 ethoxylated alcohol: coconut alkyl quaternary ammonium ethoxylate mixture (226SA), 7 parts sodium gluconate, 5 parts dihydroxyethylcyclohexylamine (CH020), 7 parts boric acid, 5 parts N-(2-hydroxyethyl)-N-(2-ethylhexyl)-β-alanine monosodium salt (LF70), and 69.9 parts water.

[0117] The preparation steps are the same as in Example 1.

[0118] Example 7

[0119] This embodiment is a specific implementation of the present invention.

[0120] An aluminum alloy cleaning agent, as shown in Table 1, comprises the following raw materials in the following mass ratios: 0.1 parts disodium ethylenediaminetetraacetate (EDTA·2Na), 6 parts fatty acid methyl ester ethoxylate (FMEE), 2 parts C9-11 ethoxylated alcohol: coconut alkyl quaternary ammonium ethoxylate mixture (226SA), 6 parts sodium gluconate, 3 parts dihydroxyethylcyclohexylamine (CH020), 5 parts boric acid, 4 parts N-(2-hydroxyethyl)-N-(2-ethylhexyl)-β-alanine monosodium salt (LF70), and 73.9 parts water.

[0121] The preparation steps are the same as in Example 1.

[0122] Cleaning agents for Comparative Examples 1 to 10 were prepared using the same preparation steps as control groups. The content of each raw material in the cleaning agent formulations of Comparative Examples 1 to 10 is shown in Table 2.

[0123] Table 1 shows the content of each raw material in the cleaning agent formulations of Examples 3 to 7.

[0124]

[0125] Table 2 shows the content of each raw material in the cleaning agent formulations of Comparative Examples 1 to 10.

[0126]

[0127] Example 8

[0128] Cleaning ability test

[0129] The performance of the cleaning agents prepared in Examples 3-7 and Comparative Examples 1-10 was determined according to the test methods in the industry standard JB / T 4323.2-1999 "Water-based Metal Cleaning Agents".

[0130] Gravimetric method for measuring cleaning ability

[0131] The test results represent the cleaning efficiency of the cleaning agent on oil stains. The higher the cleaning efficiency, the better the cleaning effect of the cleaning agent on oil stains, and the cleaner the stains.

[0132] The testing steps are as follows:

[0133] 1. Prepare a 5% working solution:

[0134] The cleaning agents prepared in Examples 3 to 7 and Comparative Examples 1 to 10 were diluted with water at a ratio of 1:19 to obtain a 5% concentration cleaning agent working solution. The 5% concentration cleaning agent working solution was heated to 60±2℃ in a constant temperature water bath, while distilled water was also placed in the constant temperature water bath for heating.

[0135] 2. Testing

[0136] Weigh the three polished test pieces and record the weight as P1. Immerse them in the standard hydraulic oil for 5 minutes, remove them and drain for 20 minutes. Scrape off the oil droplets at the bottom and weigh them again and record the weight as P2. P2-P1 is the amount of oil stains immersed in the coating.

[0137] The oil-coated test pieces were fixed vertically on the washing machine and immersed in the 5% concentration cleaning agent working solution prepared in step 1 at 60±2℃. They were left to stand for 3 minutes, then swung and washed for 3 minutes at a swung and washed speed of once per second. After removal, they were rinsed 10 times in distilled water at 60±2℃ and dried in an oven at 70±2℃ for 30 minutes. After being removed and cooled to room temperature, they were weighed and recorded as P3.

[0138] 3. Cleaning rate calculation

[0139] The weight change is calculated as P2 - P3, which represents the weight of the oil removed during cleaning.

[0140] The cleaning efficiency is calculated using the following formula:

[0141] Cleaning efficiency = (P2-P3) / (P2-P1) × 100%

[0142] The cleaning efficiency of the cleaning agents prepared in Examples 3 to 7 and Comparative Examples 1 to 10 in the gravimetric cleaning ability test is shown in Table 3.

[0143] Cleanliness test with dyne pen

[0144] A dyne pen, also known as a surface tension tester, is a commonly used cleanliness testing method in industrial settings. It can analyze minute changes in surface tension, hydrophilicity, and other properties of solid surfaces. In this embodiment, a dyne pen with a value of 34 dynes is used to draw lines on the surface of a workpiece cleaned with different cleaning agents using the same cleaning method. If the lines do not shrink, it indicates that the surface condition is consistent and there is no oil residue. If the edges shrink or the lines break into circular droplets, it indicates that there is oil residue on the solid surface.

[0145] like Figure 1 As shown in the diagram, the dyne pen test results of Comparative Example 4 and Example 7 show that the lines in Comparative Example 4 shrank into dots due to oil residue, while the cleaning agent in Example 7 thoroughly cleaned the oil stains on the aluminum alloy surface, and the lines did not shrink.

[0146] The results of the cleaning agents prepared in Examples 3 to 7 and Comparative Examples 1 to 10 using the dyne pen according to the above measurement method are shown in Table 3.

[0147] Table 3 Performance test results of the embodiments

[0148]

[0149]

[0150] Based on the cleaning efficiency of the test pieces and the dyne pen test results recorded in Table 3, data comparison revealed that:

[0151] (a) Cleaning efficiency

[0152] 1) The cleaning agent in Comparative Example 1, which does not contain surfactants FMEE and 226SA, has a cleaning efficiency of only 20.3%;

[0153] 2) The cleaning efficiency of Comparative Examples 2 and 3, which added one of the surfactants FMEE or 226SA, was significantly improved, reaching 76.4% and 84.6% respectively, indicating that the added surfactants FMEE or 226SA have a cleaning effect on oil stains on aluminum alloy surfaces.

[0154] 3) When two surfactants, FMEE and 226SA, were added simultaneously, as shown in Examples 3 to 7, the cleaning efficiency was further improved, reaching 94.4% to 99.4%, indicating that the two surfactants, FMEE and 226SA, have a synergistic effect. From the cleaning efficiency data of Examples 3 to 7, it can be seen that the cleaning agents of Examples 3 and 7 have better cleaning efficiencies, at 98.2% and 99.4% respectively, and the synergistic effect is more obvious. Among them, the cleaning agent of Example 7 has the best cleaning efficiency.

[0155] 4) Comparative Examples 4 and 5, which added a single surfactant (LF305 surfactant or LAS surfactant), had low cleaning efficiency and did not clean the oil stains thoroughly.

[0156] 5) Comparative Examples 6 to 9, which simultaneously added two surfactants, FMEE and 226SA, showed better cleaning efficiency, reaching 98.7% to 99.9%.

[0157] 6) Comparative Example 10 is an existing formula. The formula has better cleaning efficiency, but it contains phosphorus.

[0158] (II) Cleanliness test using a dyne pen

[0159] 1) When no surfactant is added or only one surfactant is added, such as Comparative Examples 1 to 5, the dyne pen test results all show shrinkage, indicating that the oil stains are not cleaned properly.

[0160] 2) When two surfactants (FMEE and 226SA) were added to the cleaning agent, as shown in Examples 3 to 7 and Comparative Examples 6 to 10, the dyne pen test results showed no shrinkage, indicating that there was no oil residue on the aluminum alloy surface, and that the two surfactants had a synergistic effect in cleaning oil stains on the aluminum alloy surface.

[0161] From the above results, we can conclude that:

[0162] 1) Surfactants FMEE and 226SA have a synergistic effect. The cleaning efficiency is better when the weight percentage of the two is 3 to 5:1, and the preferred ratio is 3:1.

[0163] 2) The cleaning aid can be sodium gluconate, CHO2O, potassium hydroxide, or monoethanolamine; however, when the cleaning aid is potassium hydroxide (as in Comparative Example 6) or monoethanolamine (as in Comparative Example 7), the cleaning agent will be strongly alkaline. If the same non-corrosive effect on aluminum alloy is achieved, more monobasic acid needs to be added to adjust the alkalinity, and the preparation cost of the cleaning agent is relatively high. Therefore, sodium gluconate and CHO2O are preferred cleaning aids.

[0164] 3) The monobasic acid can be boric acid or aminosulfonic acid. When aminosulfonic acid (such as Comparative Example 8) is used to adjust the alkalinity of the monobasic acid, the amount of solubilizer added is increased at the same time. When the monobasic acid is boric acid, the same effect of adjusting alkalinity is achieved, but the amount of solubilizer used is relatively low, which saves costs. Therefore, boric acid is preferred as the monobasic acid.

[0165] 4) The solubilizer can be LF70 or octanoic acid; when the solubilizer is octanoic acid (such as Comparative Example 9), more solubilizer needs to be added to achieve the same solubilizing effect as when using LF70, which increases the cost of cleaning agent preparation. Therefore, LF70 is preferred as the solubilizer.

[0166] 5) Although Comparative Examples 6 to 9 have better cleaning efficiency, the content of added monobasic acid or solubilizer is higher when achieving the same cleaning efficiency, and the cost of the formulation is relatively high.

[0167] 6) Comparative Example 10 contains phosphorus and corrosion inhibitors. Although the cleaning efficiency is better, the presence of phosphorus will put pressure on wastewater treatment and the aluminum corrosion inhibitor will become ineffective after long-term storage, which may easily lead to the risk of aluminum alloy corrosion.

[0168] 7) The cleaning agents prepared in Examples 3 to 7 do not contain strong alkalis, phosphorus, silicon, or corrosion inhibitors. Furthermore, the synergistic effect of the two surfactants exhibits excellent cleaning performance, solving the problems of strong alkali additives causing harm to human skin, corrosion inhibitors affecting aluminum alloy performance, phosphorus and silicon content causing environmental hazards and increasing wastewater treatment pressure, and the incomplete cleaning effect of a single surfactant. Moreover, the cost of preparing the cleaning agent is low, making it a superior aluminum alloy cleaning agent. Therefore, the cleaning agent prepared in this invention has significant value and importance in the application of cleaning oil stains on aluminum alloys.

[0169] Example 9

[0170] Corrosion performance test

[0171] The purpose of this experiment is to test the corrosion performance of the cleaning agents used in Examples 3 to 7 and Comparative Examples 1 to 10 on aluminum alloys. Generally, the corrosion level of aluminum alloy cleaning agents should be level 0 or 1. The corrosion performance rating standards for metals are shown in Table 4.

[0172] Table 4. Metal Corrosion Performance Rating Standards

[0173]

[0174] The testing steps are as follows:

[0175] 1. Prepare the cleaning solution:

[0176] The cleaning agents prepared in Examples 3 to 7 and Comparative Examples 1 to 10 were diluted with water at a ratio of 1:19 to prepare a 5% concentration cleaning working solution.

[0177] The 5% concentration cleaning working solution was placed into 500mL wide-mouth bottles.

[0178] Heat the 5% concentration cleaning working fluid to 70±2℃.

[0179] 2. Selecting and weighing test pieces

[0180] Weigh an aluminum alloy sample of conventional workpiece material on an analytical balance (accurate to 0.1 mg) and record the weight as m1.

[0181] 3. Testing

[0182] The test piece is suspended by a nylon rope and placed in a 5% concentration cleaning working solution in a wide-mouth bottle. The liquid level of the cleaning working solution is 10mm below the top of the test piece, that is, 10mm of the test piece is kept out of the working solution. The solution is kept at a constant temperature for 2 hours.

[0183] After the soaking time is over, take out the test piece and wash it in distilled water. Wipe the test piece with anhydrous ethanol and let it sit for several tens of seconds to allow it to evaporate completely naturally.

[0184] 4. Results Observation and Recording

[0185] The appearance of the part of the test piece immersed in the working solution and the part not immersed in the working solution were compared and the appearance changes were recorded. The observation results are shown in Table 5.

[0186] The dried test piece was weighed and recorded as m2. The mass change g = m1 - m2. The mass change results are shown in Table 5.

[0187] like Figure 2 As shown in the images of the corrosion tests of Comparative Example 7 and Example 7, Comparative Example 7 has a corrosion boundary line, and the lower part of the immersed test piece is white in color, which is obviously different from the upper part of the unimmersed test piece and the non-corroded Example 7.

[0188] The corrosion performance test results of the cleaning agents of Examples 3 to 7 and Comparative Examples 1 to 10 on the test pieces are shown in Table 5.

[0189] Table 5 Results of Metal Corrosion Performance Tests

[0190]

[0191]

[0192] Based on the weight and appearance changes of the test pieces recorded in Table 5, the following results were found through data comparison:

[0193] 1) The weight change of the aluminum alloy test pieces after cleaning agent treatment in Examples 3 to 7 was less than 2mg, and there was no change on the surface of the aluminum alloy, which belongs to level 0. This indicates that the components of the cleaning agents in Examples 3 to 7 are not corrosive to the aluminum alloy.

[0194] 2) No changes were observed on the surface of the aluminum alloy test pieces cleaned with the cleaning agents of Comparative Examples 1 to 5, indicating that the components of the cleaning agents of Comparative Examples 1 to 5 are not corrosive to aluminum alloys.

[0195] 3) The surfaces of Comparative Examples 6 and 7 are uneven or significantly discolored, and will corrode the aluminum alloy surface during cleaning, affecting the performance of the aluminum alloy.

[0196] 4) No changes were observed on the surface of the aluminum alloy test pieces cleaned with the cleaning agents of Comparative Examples 8 to 9, indicating that the components of the cleaning agents of Comparative Examples 8 to 9 are non-corrosive.

[0197] 5) The surface of the aluminum alloy test piece after cleaning with the cleaning agent of Comparative Example 10 showed no change, indicating that after adding aluminum corrosion inhibitor, the cleaning agent of Comparative Example 10 was not corrosive to the surface of the aluminum alloy, but Comparative Example 10 contained phosphorus.

[0198] As can be seen from the above, the components in the cleaning reagent formulations prepared in Examples 3 to 7, Comparative Examples 1 to 5, and Comparative Examples 8 to 9 are relatively safe. That is, when the chelating agent is EDTA·2Na, the nonionic surfactant is FMEE, LF305, or LAS, the amphoteric surfactant is 226SA, the cleaning aid is sodium gluconate or CHO20, the monobasic acid is boric acid or sulfamic acid, and the solubilizer is LF70 or octanoic acid, the cleaning agent will not corrode the aluminum alloy or affect its performance when cleaning aluminum alloys. This solves the problem of adding corrosion inhibitors affecting the performance of aluminum alloys and has important application significance and value in cleaning oil stains on solid surfaces of aluminum alloys.

[0199] Example 10

[0200] Cleaning agent oil solubility test

[0201] Emulsification performance represents the ability of surfactants to bind with oil stains on workpieces. Strong emulsification performance means a strong binding ability with oil stains, which can better remove oil stains from the workpiece surface and improve cleaning efficiency.

[0202] When the oil content in the cleaning agent's working fluid reaches a critical value, it will lose its cleaning effect. Therefore, it is necessary to add certain surfactants with oil-floating properties to increase the oil-floating performance of the cleaning agent. After the oil floats to the surface, it can be skimmed off by equipping an oil removal device to improve the life of the working fluid.

[0203] The experimental steps are as follows:

[0204] 1. Preparation of a 10% cleaning agent working solution

[0205] Working solution 1: The cleaning agent in Example 7 was diluted with water at a ratio of 1:9 to obtain a 10% cleaning agent working solution 1;

[0206] Working solution 2: Dilute the cleaning agent of Comparative Example 10 with water at a ratio of 1:9 to obtain a 10% cleaning agent working solution 2.

[0207] 2. Testing

[0208] Take 90 mL each of the working solution 1 and working solution 2 prepared in step 1 and place them in clean test tubes;

[0209] Add 5 mL of hydraulic oil to each of the test tubes containing working fluid 1 and working fluid 2;

[0210] Heat working fluid 1 and working fluid 2, which contain hydraulic oil, to 60°C in a constant temperature water bath and then shake them 10 times.

[0211] Observe the appearance of working fluid 1 and working fluid 2.

[0212] 3. Observation Results

[0213] Observe the emulsification state of the cleaning agent in Example 7 and Comparative Example 4 after shaking.

[0214] from Figure 1 As can be seen, in Comparative Example 4, the oil layer was completely emulsified after shaking; in Example 7, the cleaning agent consisted of an oil layer on top, followed by an emulsion layer, and then a working fluid at the bottom. This demonstrates that the cleaning agent in Example 7 also suspends oil stains. This effect is beneficial in industrial production, allowing the removed oil stains to float to the surface, facilitating their skimming. The cleaning agent can continuously clean oil stains on aluminum alloy surfaces, extending its service life and saving cleaning costs. It has significant application value in improving the cleaning life of cleaning agents.

[0215] The results above show that the cleaning agent provided by this invention has high cleaning efficiency, safe ingredients, low reagent dosage, no corrosiveness to aluminum alloy surfaces during cleaning, and contains no strong alkalis, aluminum corrosion inhibitors, phosphorus, or silicon. It is harmless to the human body, has no impact on the performance of aluminum alloys, and is relatively environmentally friendly. Furthermore, the cleaning agent of this invention has low requirements for the preparation environment and equipment, and the preparation steps are simple and easy to implement. On the other hand, it can separate the oil layer during use, improve the service life of the cleaning agent, and further save costs. Therefore, it has important application significance in the field of cleaning agent technology.

[0216] The above description is merely a preferred embodiment of the present invention and does not limit the implementation and protection scope of the present invention. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present invention should be included within the protection scope of the present invention.

Claims

1. An aluminum alloy cleaning agent, characterized in that, By weight percentage, it includes the following components: Chelating agent, 0.1-0.5%; Surfactant, 4-8%; Cleaning aid, 6-12%; Monocarboxylic acid, 5-10%; Solubilizer, 3-5%; Water, remaining amount; The chelating agent includes one or more of the following: disodium ethylenediaminetetraacetate, tetrasodium ethylenediaminetetraacetate, hydroxyethylidene diphosphonic acid, ethylenediaminetetramethylenephosphonic acid, and sodium gluconate. The surfactant is composed of a nonionic surfactant and an amphoteric surfactant, which work synergistically. The weight ratio of the nonionic surfactant to the amphoteric surfactant is 3-5:

1. The nonionic surfactant includes fatty acid methyl ester ethoxylates, and the amphoteric surfactant includes a mixture of C9-11 ethoxylated alcohols and coconut alkyl quaternary ammonium ethoxylates. The cleaning aid includes sodium gluconate and dihydroxyethylcyclohexylamine, with a weight ratio of sodium gluconate to dihydroxyethylcyclohexylamine of 1-3:1; The monocarboxylic acid is boric acid; The solubilizer is N-(2-hydroxyethyl)-N-(2-ethylhexyl)-β-alanine monosodium salt.

2. The aluminum alloy cleaning agent according to claim 1, characterized in that, The weight ratio of the nonionic surfactant to the amphoteric surfactant is 3:1; and / or The weight ratio of sodium gluconate to dihydroxyethylcyclohexylamine is 2:

1.

3. A method for preparing an aluminum alloy cleaning agent, used to prepare the aluminum alloy cleaning agent as described in any one of claims 1 to 2, characterized in that, include: S1: Heat half of the water to 50-60℃ according to the recipe; S2: Add disodium ethylenediaminetetraacetate and stir until well mixed; S3: Add fatty acid methyl ester ethoxylate, stir until completely dissolved, and continue stirring for 5-10 minutes to ensure the solution is homogeneous; S4: Replenish with the remaining water; S5: Add the following ingredients in sequence according to the formula: C9-11 ethoxylated alcohol: mixture of coconut alkyl quaternary ammonium ethoxylate, sodium gluconate, dihydroxyethylcyclohexylamine, boric acid, and N-(2-hydroxyethyl)-N-(2-ethylhexyl)-β-alanine monosodium salt. Stir for 5-10 minutes after each addition to ensure the solution is uniform and obtain a transparent solution, which is the cleaning agent. In the above steps, the stirring speed is controlled at 1000-1500 r / min.

4. The application of an aluminum alloy cleaning agent as described in any one of claims 1 to 2 or an aluminum alloy cleaning agent prepared by the preparation method as described in claim 3, characterized in that, The application is selected from at least one of the following applications: application in cleaning oil stains on solid surfaces of aluminum alloys, and application in improving the cleaning life of cleaning agents.

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