A neutral water-based cleaning agent for wire drawing oil and a preparation method thereof

Abstract

The present application relates to the technical field of cleaning agent, more particularly, it relates to a neutral water-based cleaning agent for drawing oil and a preparation method thereof.The neutral water-based cleaning agent for drawing oil is composed of the following components in mass percentage: 3-16% of penetrating emulsifier, 18-32% of polyhydric alcohol ether coupling agent, 0.4-2.8% of composite corrosion inhibitor, 0.2-1.5% of sodium citrate, 0.06-0.6% of chelating stabilizer, and the balance of deionized water.The neutral water-based cleaning agent for drawing oil is suitable for ultrasonic and 50-60 DEG C medium-temperature soaking, deep oil removal, water washing without residue, and the workpiece after cleaning is without white film and loss of luster, the metal luster is completely reserved, and the anodic coloring is not disturbed.

Description

Technical Field

[0001] This invention relates to the field of cleaning agent technology, and more specifically, to a neutral water-based cleaning agent for wire drawing oil and its preparation method. Background Technology

[0002] Aluminum alloys possess excellent plasticity and are widely used in drawing and forming processes such as photovoltaic profiles, aluminum doors and windows, automotive aluminum structural parts, aluminum wires, and aluminum tubes. After wire drawing, the workpiece surface develops fine brushed lines, tubular interlayers, and deep, narrow gaps in the profile. The industry widely employs ultrasonic cleaning combined with 50-60°C medium-temperature immersion to effectively remove oil and grime. However, the wire drawing process leaves a mixture of high-viscosity mineral oil, extreme-pressure synthetic grease, and micron-sized aluminum powder adhering to the workpiece surface, forming a sludge. If the oil and aluminum sludge are not thoroughly cleaned, subsequent annealing, spraying, or anodizing processes are highly susceptible to defects such as oil spots, coating peeling, poor conductivity, and surface flaking.

[0003] Commercially available aluminum cleaning agents can be categorized into hydrocarbon organic solvent cleaners, alkaline water-based cleaners, and neutral water-based cleaners. Hydrocarbon organic solvent cleaners have high volatile organic compound content, are flammable and explosive, and experience significant volatilization losses under ultrasonic and medium-temperature conditions. Even trace amounts of residue can hinder uniform oxide film growth, leading to uneven coloring and noticeable color differences in the profiles. Furthermore, they are subject to strict environmental regulations. Alkaline water-based degreasers have a pH greater than 10 and rapidly corrode aluminum under heating (50-60℃) and ultrasonic conditions, resulting in a white oxide haze on the surface, severe loss of gloss, uneven anodic oxide film thickness, and inconsistent color depth. They also have high energy consumption during high-temperature operation. Existing conventional neutral water-based cleaners also have several shortcomings. (1) When using linear alcohol ether surfactants, foaming is severe under high temperature and ultrasonic conditions. The foam will shield the ultrasonic cavitation energy, and additional defoamer needs to be added. The defoamer residue adheres to the aluminum surface and forms a white fog and white film. After anodizing, large areas of white spots appear. Ordinary linear surfactants have weak penetration, and the sludge in the fine cracks is difficult to clean.

[0004] (2) If a special corrosion inhibition system is not used or the corrosion inhibition system is inappropriate, the resulting corrosion inhibition film is thick and dense, and it is difficult to completely remove it by high-temperature water washing. The residual film will block the sulfuric acid electrolyte, resulting in mottled color difference in anodizing. Commercially available phosphate esters have poor heat resistance. Under working conditions of 50-60℃, their emulsification and corrosion inhibition performance will be greatly reduced, and the workpiece will easily turn white and have dull luster.

[0005] (3) When the oil and water separate under the immersion condition of 50-60℃, the oil stains and ultrafine aluminum mud are re-adheded to the workpiece after peeling, and the aluminum gray white fog remains on the board surface, and the metallic luster is greatly reduced; the emulsification and dispersion performance is poor, the heavy wire drawing oil and ultrafine aluminum powder have insufficient suspension ability, and the oil fog white mark remains on the board surface after drying, and the anodizing and dyeing are uneven.

[0006] (4) The corrosion inhibition system has insufficient heat resistance and stability. When the aluminum material is soaked for a long time at 50-60℃, it is easy to turn yellow, turn white and lose its gloss. It cannot be adapted to the medium-temperature continuous cleaning production line of high-gloss aluminum material.

[0007] (5) The formula has poor temperature stability during storage, is prone to stratification and crystallization, and inorganic salt impurities adhere to the aluminum surface to form a permanent white haze, resulting in pitting defects after anodizing.

[0008] Therefore, developing a neutral water-based cleaning agent specifically for wire drawing processes that is compatible with ultrasonic and medium-temperature immersion conditions of 50-60℃, thoroughly removes oil, leaves no residue after water rinsing, leaves no white film or loss of gloss on the workpiece after cleaning, fully preserves the metallic luster, does not interfere with anodizing coloring, is heat-resistant and stable, and is environmentally friendly is an urgent technical problem to be solved in this field. Summary of the Invention

[0009] To address the shortcomings of existing technologies, this invention provides a neutral water-based cleaning agent for wire drawing oil and its preparation method.

[0010] A neutral water-based cleaning agent for wire drawing oil, comprising the following components by weight percentage: Penetrating emulsifier 3%–16%; Polyol ether coupling agent 18%–32%; Composite corrosion inhibitor 0.4%–2.8%; Sodium citrate 0.2%–1.5%; Chelating stabilizer 0.06%–0.6%; Deionized water balance; The penetrating emulsifier is a compound of C12-C14 fatty alcohol polyoxyethylene ether, isomeric tridecyl alcohol polyoxyethylene ether 1310, surfactant LF-221 and penetrant JFC. The composite corrosion inhibitor is composed of aluminum corrosion inhibitor DX521, lauryl phosphate MA24P, and benzotriazole.

[0011] Preferably, in the penetrating emulsifier, the mass ratio of C12-C14 fatty alcohol polyoxyethylene ether, isomeric tridecyl alcohol polyoxyethylene ether 1310, surfactant LF-221 to penetrant JFC is (3-4):(2-3):(2-3):(1.5-3).

[0012] Preferably, the polyol ether coupling agent is at least two of diethylene glycol butyl ether, dipropylene glycol methyl ether, propylene glycol methyl ether, dipropylene glycol butyl ether, and dipropylene glycol propyl ether.

[0013] Preferably, in the composite corrosion inhibitor, the mass ratio of aluminum corrosion inhibitor DX521, lauryl phosphate MA24P and benzotriazole is (2.5-3):(1.4-2):(0.3-0.45).

[0014] Preferably, the chelating stabilizer is at least one of sodium gluconate, disodium ethylenediaminetetraacetate, and hydroxyethylidene diphosphonic acid.

[0015] Preferably, at 25°C, the pH of this wire drawing oil neutral water-based cleaning agent is stably controlled between 6.5 and 7.5.

[0016] A method for preparing a neutral water-based cleaning agent for wire drawing oil includes the following steps: (1) At room temperature, deionized water is added to a reactor with stirring and temperature control functions, followed by chelating stabilizer, sodium citrate and composite corrosion inhibitor, and stirred until the solution system in the reactor is completely transparent and free of solid particles. (2) Next, add polyol ether coupling agent to the above reaction vessel, stir and mix evenly, then add penetrating emulsifier, and stir at a constant speed until the solution system in the reaction vessel is uniform and transparent to obtain a mixed solution; (3) Filter to remove trace impurities from the mixed solution, discharge the material, and obtain a neutral water-based cleaning agent for wire drawing oil.

[0017] Compared with the prior art, the present invention has at least the following advantages: 1. The penetrating emulsifier in this invention is a compound of C12-C14 fatty alcohol polyoxyethylene ether, isomeric tridecyl alcohol polyoxyethylene ether 1310, surfactant LF-221, and penetrant JFC. C12-C14 fatty alcohol polyoxyethylene ether can quickly wet and spread on the aluminum surface, penetrant JFC can provide deep capillary penetration, and isomeric tridecyl alcohol polyoxyethylene ether 1310 can enhance high-temperature emulsification and foam suppression, and reduce dynamic surface tension. The three work together to inhibit and stabilize foam generation. Surfactant LF-221 is a low-foaming nonionic surfactant. Under ultrasonic and medium-temperature cleaning conditions of 50-60℃, the foam is minimal and quickly self-dissipates. At the same time, it synergistically emulsifies drawing oil, assists in dispersing ultrafine aluminum powder, and has excellent rinsing performance, without leaving any residue on the aluminum surface to form white mist.

[0018] 2. The polyol ether coupling agent in this invention can harmonize the oil and water phases, broaden the applicable temperature range of the formula, dissolve and solidify aged wire drawing oil at room temperature without heating, reduce the heating energy consumption of the production line, and prevent crystallization precipitation during high and low temperature storage, thus avoiding the whitening of aluminum materials caused by precipitates.

[0019] 3. The composite corrosion inhibitor in this invention is composed of aluminum corrosion inhibitor DX521, lauryl phosphate MA24P, and benzotriazole. It has excellent heat resistance and stability. The pH fluctuation during continuous cycling at 50-60℃ is ≤0.3. The system does not separate or crystallize. Long-term immersion at medium temperature can protect aluminum from oxidation, whitening, and loss of gloss. Furthermore, the corrosion inhibitor film formed can be completely rinsed off after two countercurrent rinsings, leaving no organic matter or inorganic salt residue. It will not form a passivation white fog on the surface of the aluminum material, nor will it block the anodizing electrolyte. After cleaning, the profile is bright and transparent with uniform coloring and no defects.

[0020] 4. The sodium citrate in this invention can act as a buffer in the neutral water-based cleaning agent for wire drawing oil, offsetting pH fluctuations caused by heating and oil saponification, and maintaining a stable pH in the range of 6.5 to 7.5 over the long term, thus avoiding pitting corrosion of aluminum materials and white spots and white fog caused by inorganic salts during water washing, and making the downstream wastewater treatment simple and low-cost. Detailed Implementation

[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. 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 of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0022] All raw materials, stirred reaction vessels, and ultrasonic cleaning equipment used in the specific implementation are commercially available conventional products, and all formula components are expressed as mass percentages.

[0023] Example 1 A neutral water-based cleaning agent for wire drawing oil, comprising the following components by weight percentage: Penetrating emulsifier: 11%; Polyol ether coupling agent: 26%; Composite corrosion inhibitor: 1.4%; Sodium citrate: 0.8%; Sodium gluconate: 0.25%; Deionized water: 60.55%; In the penetrating emulsifier, the mass ratio of C12-C14 fatty alcohol polyoxyethylene ether, isomeric tridecyl alcohol polyoxyethylene ether 1310, surfactant LF-221 and penetrant JFC is 3:2:2:1.5; In the composite corrosion inhibitor, the mass ratio of aluminum corrosion inhibitor DX521, lauryl phosphate MA24P, and benzotriazole is 2.5:1.6:0.35. The polyol ether coupling agent is prepared by compounding diethylene glycol butyl ether, dipropylene glycol methyl ether, and propylene glycol methyl ether in a mass ratio of 1:2:3.

[0024] The preparation method of this neutral water-based cleaning agent for wire drawing oil specifically includes the following steps: Weigh the required raw materials according to the mass percentage of each component in the neutral water-based cleaning agent for wire drawing oil; (1) At 25°C, add 60.55g of deionized water to the reactor with stirring and temperature control functions, and then add 0.25g of sodium gluconate, 0.8g of sodium citrate and 1.4g of composite corrosion inhibitor in sequence. Stir for 15 minutes until the solution system in the reactor is completely transparent and free of solid particles. (2) Next, add 26g of polyol ether coupling agent to the above reaction vessel, stir for 10min, mix evenly, then add 11g of penetrating emulsifier, stir for 30min until the solution system in the reaction vessel is uniform and transparent, and obtain a mixed solution; (3) Filter to remove trace impurities from the mixed solution, discharge the material to obtain a neutral water-based cleaning agent for wire drawing oil. At 25°C, the pH of the neutral water-based cleaning agent for wire drawing oil is 7.05.

[0025] Example 2 A neutral water-based cleaning agent for wire drawing oil, comprising the following components by weight percentage: Penetrating emulsifier: 16%; Polyol ether coupling agent: 30%; Composite corrosion inhibitor: 2%; Sodium citrate: 1.2%; Disodium ethylenediaminetetraacetate: 0.12%; Deionized water: 50.68%; In the penetrating emulsifier, the mass ratio of C12-C14 fatty alcohol polyoxyethylene ether, isomeric tridecyl alcohol polyoxyethylene ether 1310, surfactant LF-221 and penetrant JFC is 4:3:3:3; In the composite corrosion inhibitor, the mass ratio of aluminum corrosion inhibitor DX521, lauryl phosphate MA24P, and benzotriazole is 2.8:1.4:0.3. The polyol ether coupling agent is prepared by compounding diethylene glycol butyl ether, dipropylene glycol butyl ether, and propylene glycol methyl ether in a mass ratio of 1:2.8:3.2.

[0026] The preparation method of this neutral water-based cleaning agent for wire drawing oil specifically includes the following steps: Weigh the required raw materials according to the mass percentage of each component in the neutral water-based cleaning agent for wire drawing oil; (1) At 25°C, 50.68g of deionized water was added to the reactor with stirring and temperature control functions, followed by 0.12g of disodium ethylenediaminetetraacetate, 1.2g of sodium citrate and 2g of composite corrosion inhibitor. The mixture was stirred for 15 minutes until the solution in the reactor was completely transparent and free of solid particles. (2) Next, add 30g of polyol ether coupling agent to the above reaction vessel, stir for 10min, mix evenly, then add 16g of penetrating emulsifier, stir for 30min until the solution system in the reaction vessel is uniform and transparent, and obtain a mixed solution. (3) Filter to remove trace impurities from the mixed solution, discharge the material to obtain a neutral water-based cleaning agent for wire drawing oil. At 25°C, the pH of the neutral water-based cleaning agent for wire drawing oil is 7.32.

[0027] Example 3 A neutral water-based cleaning agent for wire drawing oil, comprising the following components by weight percentage: Penetrating emulsifier: 12%; Polyol ether coupling agent: 28%; Composite corrosion inhibitor: 2.6%; Sodium citrate: 1.4%; Hydroxyethylidene diphosphonic acid: 0.4%; Deionized water: 55.6%; In the penetrating emulsifier, the mass ratio of C12-C14 fatty alcohol polyoxyethylene ether, isomeric tridecyl alcohol polyoxyethylene ether 1310, surfactant LF-221 and penetrant JFC is 3.5:2:2:2.5; In the composite corrosion inhibitor, the mass ratio of aluminum corrosion inhibitor DX521, lauryl phosphate MA24P and benzotriazole is 3:2:0.45. The polyol ether coupling agent is prepared by compounding diethylene glycol butyl ether, dipropylene glycol methyl ether, and dipropylene glycol propyl ether in a mass ratio of 1:2.4:3.1.

[0028] The preparation method of this neutral water-based cleaning agent for wire drawing oil specifically includes the following steps: Weigh the required raw materials according to the mass percentage of each component in the neutral water-based cleaning agent for wire drawing oil; (1) At 25°C, 55.6g of deionized water was added to the reactor with stirring and temperature control functions, followed by 0.4g of hydroxyethylidene diphosphonic acid, 1.4g of sodium citrate and 2.6g of composite corrosion inhibitor. The mixture was stirred for 15 minutes until the solution in the reactor was completely transparent and free of solid particles. (2) Next, add 28g of polyol ether coupling agent to the above reaction vessel, stir for 10min, mix evenly, then add 12g of penetrating emulsifier, stir for 30min until the solution system in the reaction vessel is uniform and transparent, and obtain a mixed solution. (3) Filter to remove trace impurities from the mixed solution, discharge the material to obtain a neutral water-based cleaning agent for wire drawing oil. At 25°C, the pH of the neutral water-based cleaning agent for wire drawing oil is 7.18.

[0029] Comparative Example 1 Compared with Example 1, Comparative Example 1 is different in that it is a neutral aluminum cleaning agent sold by Dongguan Arctic Chemical Technology Co., Ltd., and is referred to as Comparative Example 1.

[0030] Comparative Example 2 Compared with Example 1, Comparative Example 2 differs in that the composite corrosion inhibitor in the neutral water-based cleaning agent for wire drawing oil is replaced with an equal mass of benzotriazole. The penetrating emulsifier in the neutral water-based cleaning agent for wire drawing oil is composed of C12-C14 fatty alcohol polyoxyethylene ether, isomeric tridecyl alcohol polyoxyethylene ether 1310, fatty alcohol polyoxyethylene ether and penetrant JFC in a mass ratio of 3:2:2:1.5. The remaining components and preparation steps remain unchanged. The neutral water-based cleaning agent for wire drawing oil is prepared and is referred to as Comparative Example 2.

[0031] Reference for core technical specifications of the product:

[0032] The performance of the neutral water-based brushing oil cleaners from Examples 1-3 and Comparative Example 2, and the neutral aluminum cleaner from Comparative Example 1, were tested to examine the technical indicators of each group of neutral water-based brushing oil cleaners and neutral aluminum cleaners (including foam performance, board appearance, anodizing compatibility, compatibility with medium-temperature substrates, and heat resistance stability). Test Example 1 The brushing oil neutral water-based cleaning agent of Examples 1-3 and Comparative Example 2, and the neutral aluminum cleaning agent of Comparative Example 1 were diluted in deionized water to obtain working solutions with a mass fraction of 5%. Test substrates of the same material and size were placed in the working solutions of each group and heated to 55°C for 5 minutes. The test substrates were 6063 high-gloss brushed aluminum profiles. Ultrasonic cleaning was carried out during the immersion process. The ultrasonic cleaning frequency was 40kHz. The foam performance under the conditions of heating immersion and ultrasonic cleaning was observed and recorded. Subsequently, the test substrate was removed from the working solution and subjected to two countercurrent rinsing and 80°C hot air drying. The cleanliness of the test substrate surface after rinsing and drying was observed and recorded. Finally, the dried test substrate was subjected to sulfuric acid anodizing staining. The coloring of the test substrate surface after anodizing was observed and recorded. The recorded results of the relevant performance are shown in Table 1.

[0033] Table 1:

[0034] Test Example 2 The brushing oil neutral water-based cleaning agent from Examples 1-3 and Comparative Example 2, and the neutral aluminum cleaning agent from Comparative Example 1, were diluted in deionized water to obtain working solutions with a mass fraction of 5%. Test substrates of the same material and size were placed in each working solution and heated to 55°C for 2 hours. The test substrates were 6063 high-gloss brushed aluminum profiles. Subsequently, the test substrates were removed from the working solutions and subjected to two counter-current rinsing cycles and 80°C hot air drying. The appearance of each group of test substrates after prolonged heating and immersion cleaning was observed. The results of the appearance effect are recorded in Table 2.

[0035] Table 2:

[0036] Test Example 3 The neutral water-based wire drawing oil cleaners from Examples 1-3 and Comparative Example 2, and the neutral aluminum cleaner from Comparative Example 1, were diluted in deionized water to obtain working solutions with a mass fraction of 5%. 200 mL of each working solution was taken as a test solution, and the initial pH value of each test solution was measured. Each test solution was then added to different reaction tanks of the same specifications and heated to 55°C, where it was held at this temperature for 72 hours. Subsequently, the pH value of the test solution in each reaction tank was measured, and the pH fluctuation was recorded. The solution condition of the test solution in each reaction tank after the continuous holding at medium temperature was observed and recorded. The medium-temperature heat resistance stability of the neutral water-based wire drawing oil cleaner and the neutral aluminum cleaner was determined by the pH fluctuation and solution condition. The recorded results of the relevant performance are shown in Table 3.

[0037] Table 3:

[0038] As can be seen from the results of test examples 1-3, the neutral water-based cleaning agent for wire drawing oil prepared in this invention has advantages such as low foaming, good cleaning performance, and heat resistance and stability. It is not easy to accumulate foam under heating conditions, and it can thoroughly remove oil from deep layers. The aluminum material does not change color after long-term immersion at medium temperature. After cleaning, there is no white film or white fog, and the metallic luster is intact. In addition, the corrosion-inhibiting film formed is easy to rinse without residue and does not interfere with anodizing coloring at all. It solves the industry pain points of traditional neutral cleaning agents such as large amount of foam, whitening and loss of gloss due to medium-temperature corrosion, corrosion-inhibiting residue affecting anodizing, and incomplete cleaning of oil stains. It has the value of large-scale industrial application.

[0039] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims. Parts not described in detail in this specification are prior art known to those skilled in the art.

Claims

1. A neutral water-based cleaning agent for wire drawing oil, characterized in that, It consists of the following components by mass percentage: Penetrating emulsifier 3%–16%; Polyol ether coupling agent 18%–32%; Composite corrosion inhibitor 0.4%–2.8%; Sodium citrate 0.2%–1.5%; Chelating stabilizer 0.06%–0.6%; Deionized water balance; The penetrating emulsifier is a compound of C12-C14 fatty alcohol polyoxyethylene ether, isomeric tridecyl alcohol polyoxyethylene ether 1310, surfactant LF-221 and penetrant JFC. The composite corrosion inhibitor is composed of aluminum corrosion inhibitor DX521, lauryl phosphate MA24P, and benzotriazole.

2. The neutral water-based cleaning agent for wire drawing oil according to claim 1, characterized in that, In the penetrating emulsifier, the mass ratio of C12-C14 fatty alcohol polyoxyethylene ether, isomeric tridecyl alcohol polyoxyethylene ether 1310, surfactant LF-221 to penetrant JFC is (3-4):(2-3):(2-3):(1.5-3).

3. The neutral water-based cleaning agent for wire drawing oil according to claim 2, characterized in that, The polyol ether coupling agent is at least two of diethylene glycol butyl ether, dipropylene glycol methyl ether, propylene glycol methyl ether, dipropylene glycol butyl ether, and dipropylene glycol propyl ether.

4. The neutral water-based cleaning agent for wire drawing oil according to claim 3, characterized in that, In the composite corrosion inhibitor, the mass ratio of aluminum corrosion inhibitor DX521, lauryl phosphate MA24P and benzotriazole is (2.5~3):(1.4~2):(0.3~0.45).

5. The neutral water-based cleaning agent for wire drawing oil according to claim 1, characterized in that, The chelating stabilizer is at least one of sodium gluconate, disodium ethylenediaminetetraacetate, and hydroxyethylidene diphosphonic acid.

6. The neutral water-based cleaning agent for wire drawing oil according to claim 1, characterized in that, At 25°C, the pH of this wire drawing oil neutral water-based cleaning agent is stably controlled between 6.5 and 7.

5.

7. The method for preparing the neutral water-based cleaning agent for wire drawing oil according to claim 1, characterized in that, Includes the following steps: (1) At room temperature, deionized water is added to a reactor with stirring and temperature control functions, followed by chelating stabilizer, sodium citrate and composite corrosion inhibitor, and stirred until the solution system in the reactor is completely transparent and free of solid particles. (2) Next, add polyol ether coupling agent to the above reaction vessel, stir and mix evenly, then add penetrating emulsifier, and stir until the solution system in the reaction vessel is uniform and transparent to obtain a mixed solution; (3) Filter to remove trace impurities from the mixed solution, discharge the material, and obtain a neutral water-based cleaning agent for wire drawing oil.

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