Normal-temperature degreasing agent as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of metal surface treatment, and particularly relates to a normal-temperature degreasing agent and a preparation method and application thereof. The invention provides a normal-temperature degreasing agent. The normal-temperature degreasing agent comprises the following components in percentage by mass: 50-90% of water, 5-15% of an alkali reagent, 5-10% of an inorganic builder, 2-8% of an organic builder, 3-5% of a chelating agent, 1-3% of an antirust agent, 1-5% of a penetrant and 2-10% of a surfactant. According to the degreasing agent used at the normal temperature, grease can be effectively removed at the normal temperature, so that the energy consumption can be reduced, the production efficiency can be improved, and the application cost of customers can be reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of metal surface treatment, and particularly relates to a room-temperature degreasing agent, a preparation method thereof, and an application thereof. Background Art

[0002] With the rapid development of the automotive industry in China, aluminum alloy wheels (referred to as "aluminum wheels" for short) have also developed rapidly. The main material of aluminum wheels is aluminum alloy (commonly aluminum-silicon alloy), which has high strength, light weight, and good corrosion resistance. Appropriate amounts of elements such as silicon, magnesium, and copper are added during the smelting of aluminum alloy to improve the material properties.

[0003] The production and manufacturing process of aluminum wheels mainly includes the following process sections: casting (forging method, obtaining the preliminary shape of the wheel), heat treatment (improving the structure and performance of the aluminum wheel), machining (including turning, drilling, milling, polishing, etc., obtaining a high-precision shape of the aluminum wheel), and surface treatment (for the purpose of beauty and corrosion prevention).

[0004] Surface treatment is a very important process step, and its process can be further subdivided into: pretreatment (also called pre-treatment): cleaning the residues of the previous process, removing the oxide film, forming a passivation film, improving corrosion resistance and the adhesion of the subsequent paint. Spraying primer: improving the adhesion of the coating. Electrophoretic coating: further improving corrosion resistance. Spraying topcoat or electroplating: endowing the wheel with color and luster, or forming a mirror effect. Baking and curing: curing the coating at high temperature.

[0005] In the entire surface treatment process, the role of the first pretreatment is quite crucial. Its main role is to clean the impurities such as grease, aluminum powder, etc. remaining from the previous machining process, remove the oxide film on the surface, and at the same time form an inorganic passivation protective film to ensure the corrosion resistance of the aluminum wheel and improve the adhesion of the subsequent paint.

[0006] The pretreatment process consists of a series of process sections. The main role of degreasing (including pre-degreasing) is to clean the impurities such as grease, aluminum powder, and solid dust remaining from the previous machining process, and provide a clean surface for the subsequent process. The degreasing process usually uses an alkaline aqueous degreasing agent. The existing technology faces a major problem: the use temperature of the degreasing agent is relatively high, generally requiring 50-60°C, and for a few so-called low-temperature degreasing agents, it also requires about 40-50°C. Once the temperature decreases, the degreasing effect becomes poor, which results in high energy consumption of the production line and affects the application cost of customers. Summary of the Invention

[0007] The purpose of the present invention is to provide a room-temperature degreasing agent, a preparation method thereof, and an application thereof.

[0008] In order to achieve the above purpose, the present invention provides the following technical solutions:

[0009] The present invention provides a normal-temperature degreasing agent, comprising components with the following mass percentages:

[0010] Water 50 - 90%, alkali reagent 5 - 15%, inorganic co-washing agent 5 - 10%, organic co-washing agent 2 - 8%, chelating agent 3 - 5%, rust inhibitor 1 - 3%, penetrant 1 - 5% and surfactant 2 - 10%.

[0011] Preferably, the alkali reagent includes organic base and / or inorganic base;

[0012] The organic base includes at least one of monoethanolamine, triethanolamine and isopropanolamine;

[0013] The inorganic base includes at least one of potassium hydroxide, sodium hydroxide, sodium carbonate and potassium carbonate.

[0014] Preferably, the inorganic co-washing agent includes at least one of potassium pyrophosphate, sodium tripolyphosphate and potassium phosphate ester;

[0015] The organic co-washing agent includes at least one of isopropanol, propylene glycol, butylene glycol, tall oil acid diethanolamide, rapeseed oil monoethanolamide, dipropylene glycol phenyl ether and tripropylene glycol butyl ether.

[0016] Preferably, the chelating agent includes at least one of sodium polyaspartate and aminotrimethylene phosphonic acid.

[0017] Preferably, the rust inhibitor includes a water-based methyl benzotriazole derivative.

[0018] Preferably, the penetrant includes at least one of sodium dioctyl sulfosuccinate, sodium polynaphthalene sulfonate and sodium dimethyl benzene sulfonate.

[0019] Preferably, the surfactant includes a cyclic amino acid surfactant;

[0020] The cyclic amino acid surfactant includes 1-aminocyclopropanecarboxylic acid.

[0021] The present invention also provides a preparation method of the normal-temperature degreasing agent according to the above technical solution, comprising the following steps:

[0022] Mix water and the alkali reagent for the first time to obtain a first mixed solution;

[0023] Mix the first mixed solution, the inorganic co-washing agent, the chelating agent and the rust inhibitor for the second time to obtain a second mixed solution;

[0024] Add the organic co-washing agent, the penetrant and the surfactant into the second mixed solution, and conduct first stirring, temperature reduction and second stirring in sequence to obtain the normal-temperature degreasing agent.

[0025] Preferably, the temperature of the first mixing is 50 - 60°C, the first mixing is carried out under stirring conditions, and the stirring time is 10 - 30 min;

[0026] The process of the second mixing is as follows: adding an inorganic builder, a chelating agent, and a rust inhibitor into the first mixed solution and stirring, the stirring temperature is 50 - 60°C, and the time is 10 - 30 min;

[0027] The temperature of the first stirring is 40 - 45°C, and the time is 30 - 60 min;

[0028] The temperature reduction is to room temperature;

[0029] The time of the second stirring is 30 - 60 min.

[0030] The present invention also provides the application of the room-temperature degreasing agent described in the above technical solution or the room-temperature degreasing agent prepared by the preparation method described in the above technical solution in the pretreatment of aluminum wheels.

[0031] The present invention provides a room-temperature degreasing agent, comprising the following components in mass percentage: 50 - 90% of water, 5 - 15% of an alkali reagent, 5 - 10% of an inorganic builder, 2 - 8% of an organic builder, 3 - 5% of a chelating agent, 1 - 3% of a rust inhibitor, 1 - 5% of a penetrant, and 2 - 10% of a surfactant.

[0032] The present invention provides a degreasing agent for use at room temperature, which can effectively remove grease at room temperature, thereby reducing energy consumption, improving production efficiency, and reducing the application cost of customers. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a test flow chart for the cleaning ability of grease in performance testing;

[0034] Figure 2 It is a test flow chart for the cleaning ability of aluminum powder in performance testing. DETAILED DESCRIPTION OF THE INVENTION

[0035] The present invention provides a room-temperature degreasing agent, comprising the following components in mass percentage:

[0036] 50 - 90% of water, 5 - 15% of an alkali reagent, 5 - 10% of an inorganic builder, 2 - 8% of an organic builder, 3 - 5% of a chelating agent, 1 - 3% of a rust inhibitor, 1 - 5% of a penetrant, and 2 - 10% of a surfactant.

[0037] The room-temperature degreasing agent provided by the present invention comprises water with a mass percentage content of 50-90%, specifically 50%, 60%, 70%, 75%, 80%, 85%, 90%. In the present invention, the water is preferably deionized water. In the present invention, the water serves as a solvent carrier for the degreasing agent.

[0038] The room-temperature degreasing agent provided by the present invention comprises an alkali reagent with a mass percentage content of 5-15%, specifically 5%, 8%, 10%, 12%, 15%. In the present invention, the alkali reagent preferably comprises an organic base and / or an inorganic base; the organic base preferably comprises at least one of monoethanolamine, triethanolamine, and isopropanolamine; the inorganic base preferably comprises at least one of potassium hydroxide, sodium hydroxide, sodium carbonate, and potassium carbonate. In the present invention, the alkali reagent provides an alkaline environment and improves the degreasing and decontamination ability.

[0039] The room-temperature degreasing agent provided by the present invention comprises an inorganic co-cleaning agent with a mass percentage content of 5-10%, specifically 5%, 6%, 7%, 8%, 9%, 10%. In the present invention, the inorganic co-cleaning agent preferably comprises at least one of potassium pyrophosphate, sodium tripolyphosphate, and potassium phosphate ester. In the present invention, the inorganic co-cleaning agent further improves the overall cleaning effect by assisting in dissolving grease.

[0040] The room-temperature degreasing agent provided by the present invention comprises an organic co-cleaning agent with a mass percentage content of 2-8%, specifically 2%, 3%, 4%, 5%, 6%, 7%, 8%. In the present invention, the organic co-cleaning agent preferably comprises at least one of isopropanol, propylene glycol, butylene glycol, tall oil acid diethanolamide, rapeseed oil monoethanolamide, dipropylene glycol phenyl ether, and tripropylene glycol butyl ether. The EO value of the tall oil acid diethanolamide is preferably greater than 7, and the EO value of the rapeseed oil monoethanolamide is preferably greater than 10. In the present invention, the organic co-cleaning agent is soluble in both water and grease, and further improves the overall cleaning effect by assisting in dissolving grease.

[0041] The room-temperature degreasing agent provided by the present invention comprises a chelating agent with a mass percentage content of 3-5%, specifically 3%, 4%, 5%. In the present invention, the chelating agent preferably comprises at least one of sodium polyaspartate and aminotrimethylene phosphonic acid. The weight-average molecular weight of the sodium polyaspartate is preferably 7000-8000. In the present invention, the chelating agent achieves the purpose of cleaning through dissolution and chelation.

[0042] The room-temperature degreasing agent provided by the present invention comprises a rust inhibitor with a mass percentage content of 1-3%, specifically 1%, 2%, 3%. In the present invention, the rust inhibitor preferably comprises a water-based methylbenzotriazole derivative. In a specific embodiment of the present invention, the methylbenzotriazole derivative is specifically BASF IRGAMET 42.

[0043] The room-temperature degreasing agent provided by the present invention comprises a penetrant with a mass percentage content of 1-3%, specifically 1%, 2%, or 3%. In the present invention, the penetrant preferably comprises at least one of sodium succinate octyl sulfonate, sodium polynaphthalene sulfonate, and sodium dimethyl benzene sulfonate. In the present invention, the penetrant can rapidly penetrate to the interface between the grease and the aluminum surface, reduce the adhesion of the grease to the aluminum surface, and make the grease easier to be cleaned.

[0044] The room-temperature degreasing agent provided by the present invention comprises a surfactant with a mass percentage content of 2-10%, specifically 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, or 10%. In the present invention, the surfactant preferably comprises a cyclic amino acid surfactant; the cyclic amino acid surfactant preferably comprises 1-aminocyclopropanecarboxylic acid. In the present invention, the surfactant has both cationic and anionic properties and can rapidly penetrate, capture, and disperse oil stains.

[0045] The present invention also provides a preparation method of the room-temperature degreasing agent according to the above technical solution, comprising the following steps:

[0046] First mix water and an alkali reagent to obtain a first mixed solution;

[0047] Second mix the first mixed solution, an inorganic auxiliary detergent, a chelating agent, and a rust inhibitor to obtain a second mixed solution;

[0048] Add an organic auxiliary detergent, a penetrant, and a surfactant to the second mixed solution, and perform first stirring, cooling, and second stirring in sequence to obtain the room-temperature degreasing agent.

[0049] In the present invention, water and an alkali reagent are first mixed to obtain a first mixed solution. In the present invention, the temperature of the first mixing is preferably 50-60°C, the first mixing is preferably carried out under stirring conditions, and the stirring time is preferably 10-30 min.

[0050] After obtaining the first mixed solution, in the present invention, the first mixed solution, an inorganic auxiliary detergent, a chelating agent, and a rust inhibitor are second mixed to obtain a second mixed solution. In the present invention, the process of the second mixing is preferably: adding the inorganic auxiliary detergent, the chelating agent, and the rust inhibitor to the first mixed solution and stirring, the stirring temperature is preferably 50-60°C, and the time is preferably 10-30 min.

[0051] After obtaining the second mixed solution, the present invention adds an organic co-washing agent, a penetrant, and a surfactant to the second mixed solution, and performs first stirring, cooling, and second stirring in sequence to obtain the room-temperature degreasing agent. In the present invention, the temperature of the first stirring is preferably 40-45°C, and the time is preferably 30-60 minutes. In the present invention, the cooling is preferably to room temperature; the time of the second stirring is preferably 30-60 minutes.

[0052] The present invention also provides the application of the room-temperature degreasing agent described in the above technical solution or the room-temperature degreasing agent prepared by the preparation method described in the above technical solution in the pretreatment of aluminum wheels.

[0053] Unless otherwise specified, the materials and equipment used in the present invention are all commercially available products in the art.

[0054] Next, the technical solutions in the present invention will be clearly and completely described in conjunction with the embodiments in the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0055] Examples 1-6

[0056] The formulations of the room-temperature degreasing agents provided in Examples 1-6 are shown in Table 1;

[0057] Table 1 Formulations of the Room-Temperature Degreasing Agents in Examples 1-6

[0058]

[0059] Preparation method: Heat water to 60°C and start stirring, add an alkali reagent and stir for 20 minutes to obtain a first mixed solution;

[0060] Add an inorganic co-washing agent, a chelating agent, and a rust inhibitor to the first mixed solution, and stir for 20 minutes to obtain a second mixed solution;

[0061] Lower the temperature of the second mixed solution to 45°C, add an organic co-washing agent, a penetrant, and a surfactant, stir for 60 minutes and then cool to room temperature, and continue to stir for 60 minutes to obtain the room-temperature degreasing agent.

[0062] Performance test

[0063] Perform performance tests on the room-temperature degreasing agents obtained in the examples; use the commercially available degreasing agent UNICHEMCOAT 229 as a comparison;

[0064] 1. pH value test: Take the room-temperature degreaser obtained in the example as a sample, mix 3 g of the sample with 97 g of water, and dilute to obtain a dilution with a mass concentration of 3% for testing;

[0065] 2. Cleaning ability for grease. The specific process schematic diagram is as Figure 1 shown;

[0066] (1) Special test substrate - standard aluminum plate (Q-Panel Bare Aluminium Panel Type A, Q-lab Corporation, USA);

[0067] (2) Special test grease - a mixture of No. 22 naphthenic mineral oil and trimethylolpropane oleate in a ratio of 1:1;

[0068] (3) Test process:

[0069] 3.1. Use a glass rod wrapped with dust-free paper to evenly coat the special grease on the special substrate, control the oil film thickness between 500 - 600 mg / m 2 and try to be as close as possible to 550 mg / m 2 . Let the substrate stand horizontally for 48 hours and then set aside for use;

[0070] 3.2. Prepare a 3% concentration degreaser solution in a 2L glass beaker and place it in an ultrasonic bath as the cleaning agent;

[0071] 3.3. Immerse the substrate coated with grease in the glass beaker, turn on the ultrasonic wave, take out the substrate every 0.5 min to observe the water film. If the water film is discontinuous, it means the grease has not been cleaned thoroughly, then put it back into the glass beaker and continue ultrasonic cleaning. Until the water film is continuous, it means the grease has been cleaned thoroughly, and record the required time. The shorter the time, the better the performance effect of the cleaning agent.

[0072] 3. Cleaning ability for aluminum powder. The specific test process schematic diagram is as Figure 2 shown;

[0073] (1) Special test aluminum powder: Aluminum powder with a mesh size of 100 - 200, Shanghai Test, Sinopharm Group;

[0074] (2) Test process:

[0075] 2.1. Prepare a 3% concentration room-temperature degreaser solution in a 100 mL stoppered graduated cylinder as the cleaning agent;

[0076] 2.2. Take 5 g of aluminum powder and add it to the above cleaning agent;

[0077] 2.3. Invert the graduated cylinder up and down and shake it 30 times to fully mix the aluminum powder. Then let it stand still. The aluminum powder will gradually sink under the action of gravity. After standing still for 30 minutes (accurately timed), proceed to the next step;

[0078] 2.4. Use a 10 mL pipette to take out the top 10 mL from the graduated cylinder and place it in a crucible (previously weighed);

[0079] 2.5. Bake the crucible in step 2.4 in a muffle furnace at 300 °C for 24 hours, weigh it, and thus calculate the amount of aluminum powder.

[0080] 2.6. The more aluminum powder there is, the better the cleaning performance of the cleaning agent on the aluminum powder.

[0081] 4. Stability test:

[0082] (1) Ambient temperature stability: Let it stand still at room temperature for 6 months;

[0083] (2) High temperature stability: Let it stand still in an oven at 40 °C for 3 months;

[0084] (3) Low temperature stability: Let it stand still in a refrigerator at 5 °C for 3 months;

[0085] The test results obtained are shown in Table 2, where the test of the cleaning ability for grease and the test of the cleaning ability for aluminum powder are both carried out at room temperature (25 °C);

[0086] Table 2 Performance test results of the ambient temperature degreaser obtained in the examples

[0087]

[0088] As can be seen from Table 1, the ambient temperature degreaser provided by the present invention has improved cleaning ability for grease and aluminum powder compared with the commercially available UNICHEMCOAT 229 degreaser, and has stable performance.

[0089] Although the above embodiments have described the present invention in detail, they are only a part of the embodiments of the present invention, not all embodiments. Other embodiments can also be obtained based on these embodiments without creative work, and these embodiments all fall within the protection scope of the present invention.

Claims

1. A room temperature degreasing agent, characterized in that: Includes the following components in percentage by mass: Water 50-90%, alkali reagent 5-15%, inorganic builder 5-10%, organic builder 2-8%, chelating agent 3-5%, rust inhibitor 1-3%, penetrant 1-5% and surfactant 2-10%.

2. The room temperature degreasing agent according to claim 1, characterized in that: The alkaline reagent includes an organic base and / or an inorganic base; The organic base comprises at least one of monoethanolamine, triethanolamine and isopropanolamine; The inorganic base includes at least one of potassium hydroxide, sodium hydroxide, sodium carbonate and potassium carbonate.

3. The room temperature degreasing agent according to claim 1, characterized in that: The inorganic builder comprises at least one of potassium pyrophosphate, sodium tripolyphosphate and potassium phosphate; The organic builder comprises at least one of isopropyl alcohol, propylene glycol, butylene glycol, tall oil acid diethanolamide, rapeseed oil monoethanolamide, dipropylene glycol phenyl ether and tripropylene glycol butyl ether.

4. The room temperature degreasing agent according to claim 1, characterized in that: The chelating agent includes at least one of sodium polyaspartate and aminotri(methylenephosphonic acid).

5. The room temperature degreasing agent according to claim 1, characterized in that: The rust inhibitor includes an aqueous toluene triazole derivative.

6. The room temperature degreasing agent according to claim 1, characterized in that: The penetrant includes at least one of sodium octyl succinate sulfonate, sodium polynaphthalene sulfonate and sodium dimethylbenzene sulfonate.

7. The room temperature degreasing agent according to claim 1, characterized in that: The surfactant includes a cyclic amino acid surfactant; The cyclic amino acid surfactant includes 1-aminocyclopropanecarboxylic acid.

8. The method for preparing the room temperature degreasing agent according to any one of claims 1 to 7, characterized in that: The following steps are involved: Firstly mixing water and an alkaline reagent to obtain a first mixed solution; The first mixed solution, the inorganic builder, the chelating agent and the rust inhibitor are mixed for the second time to obtain a second mixed solution; An organic builder, a penetrant and a surfactant are added to the second mixed liquid, and a first stirring, a cooling and a second stirring are performed in sequence to obtain the room temperature degreasing agent.

9. The preparation method according to claim 8, characterized in that: The temperature of the first mixing is 50-60° C., the first mixing is performed under stirring, and the stirring time is 10-30 min; The second mixing process is: adding an inorganic builder, a chelating agent and a rust inhibitor into the first mixed solution and stirring the mixture, wherein the stirring temperature is 50 to 60° C. and the stirring time is 10 to 30 minutes; The first stirring temperature is 40-45°C and the time is 30-60min; The cooling is to room temperature; The second stirring time is 30 to 60 minutes.

10. Use of the room temperature degreasing agent according to any one of claims 1 to 7 or the room temperature degreasing agent prepared by the preparation method according to claim 8 or 9 in the pretreatment of aluminum wheel hubs.

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