Preparation method of metal water-based cleaning agent

Abstract

The invention relates to the technical field of metal cleaning agent preparation, in particular to a preparation method of a metal water-based cleaning agent. The technical problems that in a traditional water-based cleaning agent, a phosphorus-containing component cleaning agent seriously pollutes the environment, a hydrofluoric acid-containing water-based cleaning agent has large irritation to the human body, obvious spots are left on the treated metal surface, and strong alkaline substances have large harm to the human body are solved. According to the technical scheme, the preparation method of the metal water-based cleaning agent comprises the following steps: (1) compounding the water-based cleaning agent; and (2) micro-nano bubble assisted rapid cleaning and oil removal. The water-based cleaning agent is prepared from phosphorus-free and acid-free components, the influence on the environment and the human body is small, the requirement on equipment is low, and the equipment cost is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of metal cleaning agent preparation, and in particular to a method for preparing a metal water-based cleaning agent. Background Art

[0002] Metal cleaning agents can be divided into acidic cleaning agents, alkaline cleaning agents, oily cleaning agents and water-based cleaning agents according to their main components. Among them, acidic cleaning agents and alkaline cleaning agents are gradually eliminated due to their high environmental hazards. Oily cleaning agents have disadvantages such as high volatility and easy combustion. In comparison, water-based cleaning agents have the advantages of high ignition point and low volatility, which greatly improves the safety of metal cleaning agents and makes them the current mainstream cleaning agents. At present, water-based cleaning agents are mainly composed of surfactants, builders and deionized water. However, in traditional water-based cleaning agents, phosphorus-containing cleaning agents pollute the environment, while hydrofluoric acid-containing water-based cleaning agents are highly irritating to the human body, and obvious spots remain on the metal surface after treatment. Therefore, it is urgent to develop phosphorus-free and hydrofluoric acid-free water-based cleaning agents.

[0003] Patent CN114836267A discloses a water-based cleaning agent, which can achieve nearly 100% removal of oil stains on metal surfaces by compounding 2-4% sodium metasilicate, 3-4% OP-10, 2.8-3% sodium hydroxide, 3-4% penetrant, 3-4% isomeric alcohol ether, 3-4% TX-10 and 13-15% ethanol, but the patent uses strong alkaline compounds and has high requirements for production operations. Patent CN116855955A discloses a water-based cleaning agent for aluminum alloys, which can achieve an effective oil removal rate of more than 99% by compounding 25-40% weak acid, 10-20% hydrogen peroxide and 10-20% aluminum salt, but the water-based cleaning agent is acidic and has unfavorable factors such as etching the metal surface during the cleaning process. Patent CN117757575A also discloses a water-based cleaning agent, which is compounded by 5.5% N-methylpyrrolidone, 3% diethylene glycol monomethyl ether, 12% ethanol, 0.5% sodium secondary alkyl sulfonate, 1.8% Surfynol104, 5% quaternary ammonium salt, 6% triethanolamine, 0.5% sodium nitrite and 0.01% polyether F68. Although it is phosphorus-free and weakly alkaline, its oil removal rate is only 52.11%.

[0004] Therefore, it is very important to develop a water-based cleaning agent that is phosphorus-free, has low corrosiveness and strong cleaning performance. Summary of the invention

[0005] The object of the present invention is to provide a metal water-based cleaning agent in view of the deficiencies in the prior art.

[0006] The technical solution of the present invention is:

[0007] The cleaning agent is prepared by compounding weak acid and strong base salts, rust inhibitors and betaine surfactants, and then the cleaning agent is formed into micro-nano bubbles through a generator to quickly remove oil.

[0008] The preparation method of the metal water-based cleaning agent of the present invention comprises the following steps:

[0009] (1) Preparation process of water-based cleaning agent: add a certain amount of deionized water to a three-necked flask, stir, heat to a certain temperature and keep the temperature constant, weigh a certain amount of betaine surfactant, weak acid and strong base salt, and rust inhibitor, add them to the three-necked flask in turn, stir until the solution is clear, and let it stand to defoam to obtain the compounded water-based cleaning agent.

[0010] (2) Micro-nano bubble-assisted rapid cleaning and oil removal process: Take the cleaning agent prepared in step (1) in a beaker, use a micro-nano bubble generator to generate a large number of micro-nano bubbles in the solution, and take another steel sheet with the surface evenly impregnated with artificial oil and place it in the beaker for cleaning.

[0011] The betaine surfactant described in step (1) is one or more of dodecyl dimethyl betaine, 3-sulfopropyl tetradecyl dimethyl betaine, cocamidopropyl betaine, dodecyl dihydroxyethyl betaine, lauryl amide propyl betaine, and octadecyl amide propyl betaine. The mass concentration of the betaine surfactant is 0.5-5%.

[0012] The weak acid and strong base salt described in step (1) is one or more of sodium bicarbonate, sodium citrate, sodium oxalate, sodium acetate, and sodium alginate. The mass concentration of the weak acid and strong base salt is 1-20%.

[0013] The rust inhibitor described in step (1) is one or more of 1,2,3-benzotriazole and dodecenylsuccinic acid. The mass concentration of the rust inhibitor is 0.1-5%.

[0014] The heating temperature in step (1) is 20 to 40° C., preferably 25 to 35° C.;

[0015] The stirring speed in step (1) is 100 to 500 rpm, preferably 200 to 400 rpm;

[0016] The standing defoaming time in step (1) is 1 to 20 minutes, preferably 5 to 15 minutes;

[0017] The cleaning time in step (2) is 1 to 20 minutes, preferably 5 to 15 minutes.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] (1) The formula uses betaine surfactants, which are free of harmful ingredients such as phosphorus and aluminum, and have little impact on the ecological environment and human health;

[0020] (2) The cleaning process uses micro-nano bubble assisted cleaning technology, which removes oil quickly and effectively. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The contact angle of deionized water on the steel sheet before the implementation of the present invention;

[0022] Figure 2 The contact angle of deionized water on the steel sheet after the implementation of the present invention;

[0023] Figure 3 This is a real-life picture of a steel sheet before and after the implementation of the present invention;

[0024] Figure 4 This is a diagram showing the position of a water droplet sliding down at 0s before and after the implementation of the present invention;

[0025] Figure 5 The position diagram of the water droplet sliding down for 1 second before and after the implementation of the present invention;

[0026] Figure 6 The ultra-depth-of-field microscope images before and after the implementation of the present invention;

[0027] Figure 7 Polarization curves before and after the implementation of the present invention;

[0028] Figure 8 Electrochemical parameters of the steel sheet before and after cleaning obtained by fitting the polarization curve. DETAILED DESCRIPTION

[0029] The present invention is further described below in conjunction with the embodiments and drawings. However, the embodiments of the present invention are not limited thereto, and there may be many variations. If there are any details not particularly described below, they can be understood by those skilled in the art according to conventional expressions or implemented according to the prior art.

[0030] Example 1

[0031] The total mass of the cleaning agent is 100%. Add 72% deionized water to a three-necked flask, set the speed to 300rpm, heat to 25°C and keep constant temperature. Then add 1.5% 3-sulfopropyltetradecyl dimethyl betaine, 15% sodium citrate, and 5% sodium bicarbonate respectively. After the solution is clarified, add 1% sodium oxalate, 1% sodium alginate, 0.4% 1,2,3-benzotriazole and 5% dodecenylsuccinic acid and stir until the solution is clarified. After standing and defoaming for 10 minutes, a water-based cleaning agent is obtained. Take the prepared cleaning agent in a beaker, use a micro-nano bubble generator to generate a large number of micro-nano bubbles in the solution, place the steel sheet impregnated with artificial oil in the cleaning agent for 10 minutes, and the oil removal rate can reach 99.97%. Figure 1, 2 The contact angle of deionized water on the steel sheet before and after the implementation of the present invention is 87.9° before the implementation and 33.45° after the implementation. This indicates that the hydrophilicity of the steel sheet increases after the implementation of the present invention; Figure 3 The actual situation of the steel sheet before and after the implementation of the present invention is shown in FIG. After the implementation, the surface of the steel sheet has a more metallic luster than before the implementation, indicating that the present invention can effectively remove oil after implementation; Figure 4 , 5 This is a 1s effect diagram of a water drop sliding down before and after the implementation of the present invention. The distance that a water drop slides down in 1s before the implementation is greater than the distance after the implementation, indicating that the adhesion of the steel sheet is improved after the implementation of the present invention; Figure 6 This is a comparison of the ultra-depth-of-field microscope images before and after the implementation of the present invention. The microscope image of the steel sheet after the implementation of the present invention changes from matte to bright light compared to the steel sheet before the implementation, indicating that the implementation of the present invention can achieve effective oil removal; Figure 7 The polarization curves before and after the implementation of the present invention. After the implementation of the present invention, the corrosion potential of the steel sheet shifted significantly negatively; Table 1 shows the electrochemical parameters of the steel sheet before and after cleaning fitted by the polarization curve. It can be seen from the table that the corrosion potential of the steel sheet after implementation is -0.748V, which is less than the corrosion potential of the steel sheet before implementation (-0.721V); the Log (corrosion current) of the steel sheet after implementation is -4.558, which is greater than the Log (corrosion current) of the steel sheet before implementation (-4.772), and the corrosion rate of the steel sheet increases. It shows that the present invention can effectively achieve degreasing of the steel sheet surface.

[0032] Example 2

[0033] The total mass of the cleaning agent is calculated as 100%. Add 94.5% deionized water to a three-necked flask, set the speed to 250rpm, heat to 30°C and maintain a constant temperature. Then add 0.5% dodecyl dihydroxyethyl betaine, 1% sodium oxalate, 5% sodium alginate, 0.5% 1,2,3-benzotriazole and 3% dodecenyl succinic acid respectively. After the solution is clarified, stand and defoam for 15 minutes to obtain a water-based cleaning agent. Take the prepared cleaning agent in a beaker, use a micro-nano bubble generator to generate a large number of micro-nano bubbles in the solution, place the steel sheet impregnated with artificial oil in the cleaning agent for 5 minutes, and the oil removal rate can reach 98.28%.

[0034] Example 3

[0035] The total mass of the cleaning agent is calculated as 100%. Add 93.9% deionized water to a three-necked flask, set the speed to 200rpm, heat to 35°C and maintain a constant temperature. Then add 2% dodecyl dimethyl betaine and 1% sodium citrate respectively. After the solution is clarified, add 1% sodium acetate, 1% sodium alginate, 5% sodium bicarbonate, 0.4% 1,2,3-benzotriazole and 2% dodecenyl succinic acid and stir until the solution is clarified. After standing and defoaming for 10 minutes, a water-based cleaning agent is obtained. Take the prepared cleaning agent in a beaker, use a micro-nano bubble generator to generate a large number of micro-nano bubbles in the solution, place the steel sheet impregnated with artificial oil in the cleaning agent for 15 minutes, and the oil removal rate can reach 97.98%.

[0036] Example 4

[0037] The total mass of the cleaning agent is calculated as 100%. Add 86% deionized water to a three-necked flask, set the speed to 400rpm, heat to 30°C and maintain a constant temperature. Then add 5% cocamidopropyl betaine, 1.5% 1,2,3-benzotriazole, and 3% sodium alginate respectively. After the solution is clarified, add 2.5% sodium oxalate and 2% dodecenylsuccinic acid and stir until the solution is clarified. After standing and defoaming for 10 minutes, a water-based cleaning agent is obtained. Take the prepared cleaning agent in a beaker, use a micro-nano bubble generator to generate a large number of micro-nano bubbles in the solution, place the steel sheet impregnated with artificial oil in the cleaning agent for 5 minutes, and the oil removal rate can reach 96.59%.

[0038] Example 5

[0039] The total mass of the cleaning agent is 100%. Add 72.4% deionized water to a three-necked flask, set the speed to 250rpm, heat to 35°C and keep constant temperature. Then add 1.5% 3-sulfopropyltetradecyl dimethyl betaine, 10% sodium citrate, and 5% sodium bicarbonate respectively. After the solution is clarified, add 5% sodium oxalate, 5% sodium alginate, 1% 1,2,3-benzotriazole and 5% dodecenylsuccinic acid and stir until the solution is clarified. After standing and defoaming for 5 minutes, a water-based cleaning agent is obtained. Take the prepared cleaning agent in a beaker, use a micro-nano bubble generator to generate a large number of micro-nano bubbles in the solution, place the 304 stainless steel sheet impregnated with artificial oil in the cleaning agent for 10 minutes, and the oil removal rate can reach 99.93%.

[0040] Example 6

[0041] The total mass of the cleaning agent is 100%. Add 78.1% deionized water to a three-necked flask, set the speed to 200rpm, heat to 25°C and keep constant temperature. Then add 1% 3-sulfopropyltetradecyl dimethyl betaine, 10% sodium citrate, and 5% sodium bicarbonate respectively. After the solution is clarified, add 2% sodium oxalate, 1% sodium alginate, 1% 1,2,3-benzotriazole and 2.5% dodecenylsuccinic acid and stir until the solution is clarified. After standing and defoaming for 10 minutes, a water-based cleaning agent is obtained. Take the prepared cleaning agent in a beaker, use a micro-nano bubble generator to generate a large number of micro-nano bubbles in the solution, place the 316 stainless steel sheet impregnated with artificial oil in the cleaning agent for 10 minutes, and the oil removal rate can reach 99.96%.

[0042] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of those skilled in the art without departing from the spirit of the present invention.

Claims

1. A formula of a water-based metal cleaning agent, the preparation steps of which are as follows: (1) Preparation process of water-based cleaning agent: Add a certain amount of deionized water to the container and set the speed. Add betaine surfactant, weak acid and strong base salt, and rust inhibitor to the container and stir until the solution is clear. After standing and defoaming, the cleaning agent is obtained. (2) Micro-nano bubble-assisted rapid cleaning and degreasing process: Take the cleaning agent prepared in step (1) into a beaker, use a micro-nano bubble generator to generate a large number of micro-nano bubbles in the solution, and quickly clean the oil stains on the surface of the steel sheet.

2. The formula of a water-based metal cleaning agent according to claim 1, characterized in that: Betaine surfactants are used, including but not limited to dodecyl dimethyl betaine, 3-sulfopropyl tetradecyl dimethyl betaine, cocamidopropyl betaine, dodecyl dihydroxyethyl betaine, lauryl amide propyl betaine, and octadecyl amide propyl betaine. The mass concentration of betaine surfactants is 0.5-5%.

3. The formula of a water-based metal cleaning agent according to claim 1, characterized in that: Composite weak acid and strong base salts. Including but not limited to sodium bicarbonate, sodium citrate, sodium oxalate, sodium acetate, sodium alginate. The mass concentration of the weak acid and strong base salt is 1-20%.

4. The formula of a water-based metal cleaning agent according to claim 1, characterized in that: Compound rust inhibitor. Including but not limited to benzotriazole and dodecenylsuccinic acid. The mass concentration of the rust inhibitor is 0.1-5%.

5. The formula of a water-based metal cleaning agent according to claim 1, characterized in that: In step 1, the temperature of the cleaning agent is 20-40° C., preferably 25-35° C.; the stirring speed is 100-500 rpm, preferably 200-400 rpm; and the standing defoaming time is 1-20 min, preferably 5-15 min.

6. The formula of a water-based metal cleaning agent according to claim 1, characterized in that: In step 2, micro-nano bubbles are used to assist in rapid cleaning and oil removal technology.

7. The formula of a water-based metal cleaning agent according to claim 1, characterized in that: The cleaning time in step 2 is 1 to 20 minutes, preferably 5 to 15 minutes.

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