A metal cleaning agent, its preparation method and application

Abstract

This application relates to a metal cleaning agent, its preparation method, and its application. The metal cleaning agent comprises the following raw materials: an organic alkali, a rust inhibitor, a dispersant, a surfactant, a defoamer, and water. Based on the total weight of the metal cleaning agent (100%), the content of each raw material is as follows: organic alkali 10-20 wt%, rust inhibitor 10-20 wt%, dispersant 0.5-3.0 wt%, surfactant 0.5-2.0 wt%, defoamer 0.05-0.2 wt%, and water as the balance. The metal cleaning agent provided by this application has advantages such as high cleaning efficiency, good biological stability, and good rust prevention effect, and the preparation method is simple and low-cost.

Description

Technical Field

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

[0002] Cutting oils with good lubricity are often used in metal machining. However, because cutting oils have high viscosity, they tend to adhere to the surface of the workpiece and are difficult to clean. Therefore, cleaning agents are needed for cleaning. The cleaning agent must not cause corrosion or damage to the metal. This requires the cleaning agent to: (1) have a high cleaning rate and clean the surface of the workpiece in a short time; (2) have low corrosivity to avoid chemical damage to the surface of the workpiece; and (3) have good rust prevention properties to improve the machining accuracy.

[0003] Commonly used cleaning agents include acidic cleaning agents, alkaline cleaning agents, water-based cleaning agents, semi-aqueous cleaning agents, and solvent-based cleaning agents. Currently, existing metal cleaning agents have the following problems: (1) poor cleaning effect, the lower the concentration of the diluted solution, the worse the effect; (2) solvent-based cleaning agents are prone to spoilage and deterioration, and oil-liquid mixing easily leads to poor biological stability, significantly shortening the service life, increasing the cost of use, and increasing the pressure on emission standards; (3) water-based metal cleaning agents have poor rust prevention effect. Under high temperature and high humidity conditions, it is necessary to ensure that no rust appears on the surface of the workpiece within several days after the cleaning process is completed, but current water-based cleaning agents are difficult to meet the requirements.

[0004] Therefore, it is essential to develop a new metal cleaning agent. Summary of the Invention

[0005] To address the aforementioned technical problems, this application provides a metal cleaning agent, its preparation method, and its application. The metal cleaning agent has advantages such as high cleaning rate, good biological stability, and good rust prevention effect, and its preparation method is simple and low-cost.

[0006] In a first aspect, this application provides a metal cleaning agent, the raw materials of which include: organic alkali, rust inhibitor, dispersant, surfactant, defoamer and water;

[0007] Based on the total weight of the metal cleaning agent as 100%, the content of each component raw material in the metal cleaning agent is as follows:

[0008] Organic base 10-20 wt%

[0009] Rust inhibitor 10-20 wt%

[0010] Dispersant 0.5-3.0 wt%;

[0011] Surfactant 0.5-2.0 wt%

[0012] Defoamer 0.05-0.2 wt%;

[0013] Water balance.

[0014] The content of the organic base can be 12 wt%, 14 wt%, 16 wt%, 18 wt%, etc.

[0015] The content of the rust inhibitor can be 12 wt%, 14 wt%, 16 wt%, 18 wt%, etc.

[0016] The content of the dispersant can be 0.6 wt%, 0.8 wt%, 1.0 wt%, 1.2 wt%, 1.4 wt%, 1.6 wt%, 1.8 wt%, 2.0 wt%, 2.2 wt%, 2.4 wt%, 2.6 wt%, 2.8 wt%, etc.

[0017] The content of the surfactant can be 0.6 wt%, 0.8 wt%, 1.0 wt%, 1.2 wt%, 1.4 wt%, 1.6 wt%, 1.8 wt%, etc.

[0018] The content of the defoamer can be 0.06 wt%, 0.08 wt%, 0.1 wt%, 0.12 wt%, 0.14 wt%, 0.16 wt%, 0.18 wt%, etc.

[0019] The metal cleaning agent provided in this application, through the synergistic effect of organic alkali, rust inhibitor, dispersant, and surfactant, can effectively clean heavy oil stains on the surface of workpieces, providing long-lasting rust prevention while also maintaining biological stability. It boasts advantages such as high cleaning efficiency, good biological stability, excellent rust prevention effect, and low cost. Specifically:

[0020] The metal cleaning agent provided in this application is a water-based metal cleaning agent, which dissolves very easily and evenly, and has a better cleaning effect on heavy oil stains, while protecting the workpiece surface from contamination. The organic alkali and rust inhibitor in the metal cleaning agent can be effectively dispersed in water, forming a uniform and continuous passivation layer on the metal surface during use, forming a dense protective film, thus having good rust prevention performance. It protects the product from corrosion and rust during processing, and the pH can be maintained between 9.0 and 10.0 during use, which can effectively slow down the corrosion of workpieces and copper-containing molds and inhibit the growth of bacteria. The metal cleaning agent provided in this application can be diluted with 5.0% to 10.0% water, effectively reducing the cost of use.

[0021] As a preferred embodiment of this application, the content of the organic base is 10-13 wt%.

[0022] As a preferred embodiment of this application, the content of the dispersant is 1-1.5 wt%.

[0023] As a preferred embodiment of this application, the content of the surfactant is 0.8-1 wt%.

[0024] As a preferred embodiment of this application, the content of the defoamer is 0.2-0.25 wt%.

[0025] As a preferred technical solution of this application, the rust inhibitor is selected from any one or a combination of at least two of dibasic acids, tribasic acids, or tetrabasic acids.

[0026] Rust inhibitors work by forming a dense passivation layer on the metal surface, isolating the metal from air and moisture in the atmosphere, thereby reducing the activity of the metal and slowing down the rate of oxidation and corrosion.

[0027] As a preferred technical solution of this application, the rust inhibitor is selected from a combination of dibasic acid, tribasic acid and tetrabasic acid.

[0028] As a preferred technical solution of this application, the mass ratio of the dicarboxylic acid, tricarboxylic acid and tetracarboxylic acid is (4-7):(5-6):(5-7), such as 4:5:5, 4:6:5, 4:5:6, 4:5:7, 5:5:5, etc., preferably 4:5:5.

[0029] When the mass ratio of dibasic acid, tribasic acid and tetrabasic acid in the rust inhibitor is within the range of this application, the resulting metal cleaner can play a rust-preventing role with multiple passivation layer protective films, and the effect is longer and better.

[0030] This application's metal cleaning agent incorporates a combination of multiple rust inhibitors to ensure the rust-proof performance of the metal surface. However, the rust inhibitor in this application is a polybasic acid, which will release H+ ions in the aqueous solution. + Ions, reactive H + Since these substances react with metals, they cannot be directly used to prevent rust. This application utilizes an organic alkali for neutralization, forming a corresponding acid salt, which then adheres an insoluble passivation film or reactive film to the metal surface, thereby achieving a rust-preventive effect.

[0031] As a preferred embodiment of this application, the organic base is selected from monoethanolamine and / or triethanolamine.

[0032] As a preferred embodiment of this application, the organic alkali is selected from a combination of monoethanolamine and triethanolamine, and preferably the mass ratio of monoethanolamine to triethanolamine is (1-1.6):1.

[0033] The organic alkali provided in this application has high safety and works better with rust inhibitors.

[0034] As a preferred technical solution of this application, the dispersant is selected from ethylenediamine polyoxyethylene polyoxypropylene ether and / or sodium polyacrylate.

[0035] In this application, the dispersant is used as a water quality stabilizer. When the concentration of calcium and magnesium ions is high, scale is easily precipitated. The presence of the dispersant can be adsorbed on the crystal surface, hindering the aggregation of crystals, making the scale layer loose and easy to clean, thereby achieving the purpose of preventing and eliminating scale, with a significant scale prevention effect.

[0036] As a preferred embodiment of this application, the dispersant is selected from a combination of ethylenediamine polyoxyethylene polyoxypropylene ether and sodium polyacrylate, and more preferably, the mass ratio of ethylenediamine polyoxyethylene polyoxypropylene ether and sodium polyacrylate is 1:1.

[0037] As a preferred technical solution of this application, the surfactant is selected from any one or a combination of at least two of fatty alcohol polyoxyethylene ether (AEO), branched or semi-branched alcohol polyoxyethylene ether (e.g., SAFOL EN), or fatty alcohol alkoxy compounds (e.g., MARLOX FK57).

[0038] In this application, the surfactant can be adsorbed at the gas-liquid interface to reduce the surface tension of the liquid, or it can be adsorbed between the liquid interfaces to reduce the interfacial tension between oil and water, or it can aggregate in the bulk solution to form aggregates, and has a series of excellent physicochemical properties such as wetting, anti-adhesion, solubilization, dispersion, washing, and corrosion prevention.

[0039] As a preferred technical solution of this application, the surfactant is selected from a combination of fatty alcohol polyoxyethylene ether and fatty alcohol alkoxy compound.

[0040] As a preferred technical solution of this application, the mass ratio of the fatty alcohol polyoxyethylene ether to the fatty alcohol alkoxy compound is (1-4):(1-4), more preferably 1:1.

[0041] The surfactant provided in this application has better application performance.

[0042] As a preferred technical solution of this application, the defoamer is selected from a combination of silica and mineral oil (e.g., DAPRODF-21) and / or organosilicon.

[0043] In this application, the defoamer can reduce the surface tension of water, solution, suspension, etc., to prevent foam generation, or reduce or eliminate existing foam. The addition of defoamer in this application can prevent the cleaning agent from generating bubbles during use, thereby avoiding damage to stamping parts or molds.

[0044] As a preferred technical solution of this application, the defoamer is selected from organosilicon.

[0045] When silicone is used as a defoamer, it can be well dispersed in water and has excellent defoaming properties. Only a small amount is needed to meet the performance and usage requirements of the cleaning agent.

[0046] Secondly, this application provides a method for preparing the metal cleaning agent described in the first aspect, the method comprising the following steps:

[0047] (1) Mix the organic base, rust inhibitor and water to obtain a mixed solution;

[0048] (2) Add dispersant, surfactant and defoamer to the mixed solution to obtain the metal cleaning agent.

[0049] As a preferred technical solution of this application, the reaction temperature in the preparation method is 30-35℃.

[0050] The preparation method provided in this application is simple, utilizing the organic alkali and acidic rust inhibitor to fully convert them into a water-soluble metal cleaning agent, thereby enabling it to be evenly dispersed in water for better performance.

[0051] In the preparation method of this application, it is necessary to stir thoroughly until the solution is clear and transparent. The resulting metal cleaning agent is a transparent liquid. When using it, it can be diluted with water, and the amount of water added is 5-10 wt% of the metal cleaning agent.

[0052] Thirdly, this application provides the application of the metal cleaning agent described in the first aspect in metal cleaning, preferably in the cleaning of chromium-manganese alloys.

[0053] Chromium-manganese alloys are important alloy materials in the industrial field, possessing excellent wear resistance and impact resistance. They are mainly used in various wear-prone equipment parts in industries such as building materials machinery, power machinery, and mining machinery, such as mill liners, mixer blades, and fan blades. Chromium-manganese alloys are difficult to clean with cutting oil during machining. The metal cleaning agent provided in this application can effectively clean heavy oil stains on the workpiece surface, providing long-lasting rust prevention and good biocompatibility. This makes the machining process of high-chromium-manganese alloys safer, more environmentally friendly, lower in cost, and more effective.

[0054] The technical solution provided in this application has the following advantages compared with the prior art:

[0055] 1. High cleaning efficiency: The metal cleaning agent provided in this application is a water-based metal cleaning agent, which is very easy to dissolve and uniformly. It has a better cleaning effect on heavy oil stains and protects the surface of the workpiece from contamination.

[0056] 2. Excellent rust prevention effect: The organic alkali and rust inhibitor in the metal cleaning agent of this application can be effectively dispersed in water. When used, they can form a uniform and continuous passivation layer on the metal surface, forming a dense protective film, thus having good rust prevention and corrosion resistance, protecting the product from corrosion and rust during processing.

[0057] 3. Good biological stability: The pH of the metal cleaning agent of this application can be maintained between 9.0 and 10.0 during use, which effectively slows down the corrosion of workpieces and copper-containing molds and inhibits the growth of bacteria;

[0058] 4. Low cost: The metal cleaning agent of this application can be diluted with 5-10 wt% water, which effectively reduces the cost of use. Detailed Implementation

[0059] To better understand the above-mentioned objectives, features, and advantages of this application, the solution of this application will be further described below. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0060] Many specific details are set forth in the following description in order to provide a full understanding of this application, but this application may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of this application, and not all embodiments.

[0061] The sources of some of the raw materials involved in the embodiments of this application are shown below:

[0062] Monoethanolamine: Junyan New Material Technology (Shanghai) Co., Ltd.; Triethanolamine: Junyan New Material Technology (Shanghai) Co., Ltd.; Tribasic acid: Tianjin Haoruisen Chemical Trade Co., Ltd.; Dibasic acid: Shandong Kaisai Biotechnology Materials Co., Ltd.; Tetrabasic acid: Nuotai Biotechnology (Hefei) Co., Ltd.; Ethylenediamine polyoxyethylene polyoxypropylene ether (poloxam 407): BASF (China) Co., Ltd.; Sodium polyacrylate (PA25): BASF (China) Co., Ltd.; Natural fatty alcohol polyoxyethylene ether (AEO): Sasol (China) Chemical Co., Ltd.; Branched and semi-branched alcohol polyoxyethylene ether (SAFOL EN): Sasol (China) Chemical Co., Ltd.; Natural fatty alcohol alkoxy compound (MARLOX FK57): Sasol (China) Chemical Co., Ltd.; DAPRODF-21 defoamer: Tianjin Haoruisen Chemical Trade Co., Ltd.; Organosilicon defoamer (MS-575): Mengqingxin Additives Trade (Shanghai) Co., Ltd.

[0063] The testing methods involved in the embodiments of this application are as follows:

[0064] In this application, the test samples are all diluted solutions of the metal cleaning agent obtained in the examples. The metal cleaning agent is taken, diluted with 5wt% water, and then tested.

[0065] (1) The methods for visual inspection, pH value, defoaming, hard water stability test, water insoluble matter test, high and low temperature stability test, and rinsing performance test shall be carried out in accordance with sections 4, 5, 10, 11, 12, 13 and 14 of JB / T4323.2-1999 Test Methods for Water-based Metal Cleaning Agents.

[0066] (2) The cleaning ability test method shall be carried out in accordance with Section 6 of JB / T4323.2-1999 Test Methods for Water-based Metal Cleaning Agents.

[0067] (3) The rust prevention test method shall be carried out in accordance with Section 8 of JB / T4323.2-1999 Test Methods for Water-based Metal Cleaning Agents.

[0068] (4) Corrosion test method shall be carried out in accordance with Section 9 of JB / T4323.2-1999 Test Methods for Water-based Metal Cleaning Agents.

[0069] Example 1

[0070] This embodiment provides a metal cleaning agent and its preparation method. The raw materials and their contents in the metal cleaning agent are shown in Table 1.

[0071] The preparation method includes the following steps:

[0072] (1) Mix organic alkali, rust inhibitor and deionized water, and stir at 30-35℃ until the solution is clear and transparent to obtain a mixed solution;

[0073] (2) Add dispersant and surfactant to the above mixed solution, stir until the solution is clear and transparent, add defoamer, stir evenly, and obtain the metal cleaning agent.

[0074] Table 1

[0075]

[0076] Performance Test 1

[0077] The metal cleaning agents obtained in Examples 1-1 to 1-5 were subjected to performance tests including appearance observation, hard water stability test, water insoluble matter test, and defoaming property test. The results are shown in Table 2.

[0078] Table 2

[0079]

[0080] As can be seen from Table 2, when the dosages of monoethanolamine and triethanolamine are within a suitable range, the pH in the system is around 9.8 - 9.9, and the obtained metal cleaning agent has a uniform appearance, qualified properties and remains stable. From the comparison between Example 1-2 and Example 1-5, it can be seen that the dosage of triethanolamine should not be too much, as excessive dosage will cause the appearance to become turbid. This is because triethanolamine has good stability and also has a certain anti-corrosion effect on metal materials, but a large proportion of the hydrocarbon group content in excessive triethanolamine will result in insufficient hydrophilicity, thus making the transparency not meet the requirements.

[0081] Example 2

[0082] This example provides a metal cleaning agent and its preparation method. The composition raw materials and their contents in the metal cleaning agent are shown in Table 3;

[0083] The preparation method is the same as that of Example 1.

[0084] Table 3

[0085]

[0086] Performance Test 2

[0087] Perform appearance observation and performance tests such as defoaming property on the metal cleaning agents obtained from Example 2-1 to Example 2-4. The results are shown in Table 4:

[0088] Table 4

[0089]

[0090] As can be seen from Table 4, according to the requirements of the JB / T4323.1-1999 water-based metal cleaning agent standard, a foam height ≤ 5 mm is qualified. Therefore, when the dosage of the defoaming agent is within the range of 0.2% - 0.25%, the defoaming effect is better. The working principle of the defoaming agent is to change the surface tension of the foam, making small bubbles combine into large bubbles and causing the bubbles to burst to achieve the defoaming effect. When the dosage of the defoaming agent is too low, the reduction of the surface tension of the liquid is small, and it cannot achieve a good defoaming effect.

[0091] Example 3

[0092] This example provides a metal cleaning agent and its preparation method. The composition raw materials and their contents in the metal cleaning agent are shown in Table 5;

[0093] The preparation method is the same as that of Example 1.

[0094] Table 5

[0095]

[0096] Performance Test 3

[0097] The metal cleaning agents obtained in Examples 3-1 to 3-5 were subjected to performance tests, including visual inspection and high / low temperature tests. The results are shown in Table 6.

[0098] Table 6

[0099]

[0100] As shown in Table 6, the metal cleaning agent is more stable when the amount of dispersant is between 1% and 1.5%, and the effect is best when PA25 and poloxamer 407 are used in combination. The more dispersant is added, the easier it is for the particles to stick together and aggregate, gradually forming large particle suspensions until a layered state is formed.

[0101] Example 4

[0102] This embodiment provides a metal cleaning agent and its preparation method. The raw materials and their contents in the metal cleaning agent are shown in Table 7.

[0103] The preparation method is the same as in Example 1.

[0104] Table 7

[0105]

[0106] Performance Test 4

[0107] The metal cleaning agents obtained in Examples 4-1 to 4-6 were subjected to performance tests, including appearance observation, cleaning performance, and rinsing performance. The results are shown in Table 8.

[0108] Table 8

[0109]

[0110] Table 8 shows that the metal cleaning agent performs best when the surfactant dosage is between 0.8% and 1%. Insufficient dosage fails to achieve optimal cleaning, while excessive dosage prevents the formation of an effective monomolecular film, resulting in the opposite effect. Furthermore, the optimal ratio of surfactants MARLOX FK57 and AEO is 1:1. It can also be seen that the synergistic effect of the compounded dispersant and surfactant ensures that the resulting metal cleaning agent possesses excellent cleaning and rinsing properties, achieving a balanced and favorable overall performance.

[0111] Example 5

[0112] This embodiment provides a metal cleaning agent and its preparation method. The raw materials and their contents in the metal cleaning agent are shown in Table 9.

[0113] The preparation method is the same as in Example 1.

[0114] Table 9

[0115]

[0116] Performance Test 5

[0117] The metal cleaning agents obtained in Examples 5-1 to 5-6 were tested for their rust-preventive and corrosion-resistant properties. The results are shown in Table 10.

[0118] Table 10

[0119]

[0120] As shown in Table 10, the metal cleaning agent exhibits the best rust and corrosion prevention effects when a mixture of dibasic, tribasic, and tetrabasic acids is used as a rust inhibitor. Furthermore, a good rust prevention effect is achieved when the ratio of dibasic, tribasic, and tetrabasic acids is between (4-7):(5-6):(5-7).

[0121] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0122] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A metal cleaning agent, characterized in that, The metal cleaning agent is composed of the following raw materials: organic alkali, rust inhibitor, dispersant, surfactant, defoamer and water; Based on the total weight of the metal cleaning agent as 100%, the content of each component raw material in the metal cleaning agent is as follows: Organic base 10-20 wt%; Rust inhibitor 10-20 wt%; Dispersant 0.5-3.0 wt%; Surfactant 0.5-2.0 wt%; Defoamer 0.2-0.25 wt%; Water balance; The rust inhibitor is selected from a combination of dibasic acid, tribasic acid and tetrabasic acid, and the mass ratio of the dibasic acid, tribasic acid and tetrabasic acid is (4-7):(5-6):(5-7); The organic base is selected from a combination of monoethanolamine and triethanolamine, wherein the mass ratio of monoethanolamine to triethanolamine is (1-1.6):

1.

2. The metal cleaning agent according to claim 1, characterized in that, The content of the organic base is 10-13 wt%. And / or, the content of the dispersant is 1-1.5 wt%; And / or, the content of the surfactant is 0.8-1 wt%.

3. The metal cleaning agent according to claim 1 or 2, characterized in that, The dispersant is selected from ethylenediamine polyoxyethylene polyoxypropylene ether and / or sodium polyacrylate; And / or, the surfactant is selected from any one or a combination of at least two of fatty alcohol polyoxyethylene ethers, branched or semi-branched alcohol polyoxyethylene ethers, or fatty alcohol alkoxy compounds; And / or, the defoamer is selected from a combination of silica and mineral oil and / or organosilicon.

4. The metal cleaning agent according to claim 3, characterized in that, The dispersant is selected from a combination of ethylenediamine polyoxyethylene polyoxypropylene ether and sodium polyacrylate; And / or, the surfactant is selected from a combination of fatty alcohol polyoxyethylene ether and fatty alcohol alkoxy compound, wherein the mass ratio of fatty alcohol polyoxyethylene ether to fatty alcohol alkoxy compound is (1-4):(1-4); And / or, the defoamer is selected from organosilicon.

5. The method for preparing the metal cleaning agent according to any one of claims 1-4, characterized in that, The preparation method includes the following steps: (1) Mix the organic base, rust inhibitor and water to obtain a mixed solution; (2) Add dispersant, surfactant and defoamer to the mixed solution to obtain the metal cleaning agent.

6. The application of the metal cleaning agent according to any one of claims 1-4 in metal cleaning.

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