Environment-friendly drawing oil and preparation method thereof

Abstract

The invention belongs to the technical field of metal processing oil, and particularly relates to environment-friendly drawing oil and a preparation method thereof. The drawing oil is prepared from the following components in parts by weight: 100 parts of base oil, 5 to 20 parts of polydopamine modified metal disulfide, 1 to 10 parts of an antirust agent, 1 to 10 parts of an emulsifier and 0.5 to 5 parts of molybdenum dialkyldithiocarbamate. The environment-friendly drawing oil disclosed by the invention has excellent lubrication, wear resistance and cleaning property.

Description

Technical Field

[0001] The present invention belongs to the technical field of metalworking oils, and particularly relates to an environmentally friendly drawing oil and a preparation method thereof. Background Art

[0002] Metal drawing forming is a core technology in processes such as automobile manufacturing and household appliance housing processing. It mainly applies pressure to a metal sheet in a mold to cause plastic deformation to form complex geometric shapes. In the metal drawing process, drawing oil is used to reduce the friction between the material and the mold, protect the surface of the workpiece, extend the mold life, and ensure the stability and efficiency of the processing process.

[0003] The drawing oil needs to have extreme pressure lubricity, cooling and antioxidant properties. Traditional drawing oils are mostly based on mineral oils or synthetic esters, and sulfur, phosphorus, and chlorine-based extreme pressure additives are added. However, sulfur and chlorine additives decompose at high temperatures to produce corrosive gases, resulting in insufficient environmental protection; and there is a problem that high-viscosity mineral oils and solid additives (such as graphite and molybdenum disulfide) are likely to remain on the surface of the workpiece, and strong alkaline cleaning agents need to be used, increasing production costs.

[0004] CN115595197A discloses a drawing oil for a new energy battery housing and a preparation method thereof, which can effectively reduce the friction force during the drawing process, improve the strength and lubrication performance of the material, prevent scratching, and ensure the stability and protection effect of the battery housing during the drawing process. However, it contains the nano-additive tin disulfide, and particle agglomeration or precipitation may occur during long-term storage, and it is necessary to stir regularly or add a dispersant to maintain its performance. Summary of the Invention

[0005] In a first aspect of the present invention, an environmentally friendly drawing oil is provided. By weight, the drawing oil includes: 100 parts of base oil, 5-20 parts of polydopamine-modified metal disulfide, 1-10 parts of rust inhibitor, 1-10 parts of emulsifier, and 0.5-5 parts of molybdenum dialkyldithiocarbamate.

[0006] The environmentally friendly drawing oil in the present invention has excellent lubricating wear resistance and detergency. It is speculated that the polydopamine-modified metal disulfide in polydopamine can be better dispersed in the system, and can form a uniform lubricating film on the metal or non-metal surface and maintain lubrication continuity by acting with other components, and can endow the drawing oil with surface water clarity, reducing the adhesion force between the oil film and pollutants.

[0007] As a more preferred technical solution of the present invention, by weight, the drawing oil includes: 100 parts of base oil, 8-12 parts of polydopamine-modified metal disulfide, 4-6 parts of rust inhibitor, 4-6 parts of emulsifier, and 1.5-2.5 parts of molybdenum dialkyldithiocarbamate.

[0008] As a more preferred technical solution of the present invention, by weight, the stretching oil comprises: 100 parts of base oil, 10 parts of polydopamine-modified metal disulfide, 5 parts of rust inhibitor, 5 parts of emulsifier, and 2 parts of molybdenum dialkyldithiocarbamate.

[0009] As a preferred technical solution of the present invention, the base oil contains GTL base oil.

[0010] The GTL base oil in the base oil of the present invention contains almost no sulfur, nitrogen and aromatic compounds. Compared with traditional mineral oils, it has a certain biodegradability and can reduce the risk of environmental residues. Moreover, the GTL base oil is prepared by Fischer-Tropsch synthesis from natural gas, and its molecular structure is highly saturated. Its antioxidant ability is significantly better than that of mineral oils, and it can extend the service life of the stretching oil.

[0011] In the present invention, it was found in the research that when the stretching oil only contains GTL base oil, the obtained stretching oil has good stamping wear resistance and detergency, but it was found that the stability of the obtained stretching oil is poor, which may be due to the fact that the GTL base oil may still have too high viscosity at extremely low temperatures. As a more preferred technical solution of the present invention, the base oil also contains epoxidized soybean oil.

[0012] In the present invention, further research found that the synergistic effect of using GTL base oil and epoxidized soybean oil in the present invention not only makes the stretching have better stamping wear resistance and detergency, but also the stretching oil has good stability. It is speculated that the polar epoxy groups in epoxidized soybean oil can interact with the isoparaffins in the GTL base oil through hydrogen bonds or van der Waals forces, inhibit the formation of wax crystal networks, and reduce the risk of possible solidification.

[0013] As a preferred technical solution of the present invention, the weight ratio of the GTL base oil to the epoxidized soybean oil is (3-8):1, such as 3:1, 4:1, 5:1, 6:1, 7:1 or 8:1, and preferably (4-5):1.

[0014] As a more preferred technical solution of the present invention, the metal disulfide in the polydopamine-modified metal disulfide is selected from tungsten disulfide and / or molybdenum disulfide, and preferably a combination of tungsten disulfide and molybdenum disulfide.

[0015] In the present invention, it was found in the research that the synergistic effect of using tungsten disulfide and molybdenum disulfide can better improve the lubricating wear resistance of the stretching oil. It is speculated that the polydopamine-modified tungsten disulfide and molybdenum disulfide can better form a composite layered structure, alternately slide during the friction process, reduce the shear resistance, reduce the energy loss, and at the same time, the two can form a denser FeS-WS2-MoS2 gradient film.

[0016] As a more preferred technical solution of the present invention, the mass ratio of tungsten disulfide to molybdenum disulfide is 1:(0.3 - 0.8), such as 1:0.3, 1:0.4, 1:0.5, 1:0.6, 1:0.7 or 1:0.8, and preferably 1:(0.5 - 0.6).

[0017] As a preferred technical solution of the present invention, the average particle size of each of tungsten disulfide and molybdenum disulfide is 1 - 5 microns.

[0018] In the present invention, the mass ratio of tungsten disulfide to molybdenum disulfide in the polydopamine-modified metal disulfide is based on the raw material ratio during its preparation.

[0019] As a preferred technical solution of the present invention, the preparation method of the polydopamine-modified metal disulfide includes:

[0020] (1) Dispersing the metal disulfide in water to obtain a dispersion;

[0021] (2) Mixing dopamine hydrochloride and Tris buffer until the dopamine hydrochloride is completely dissolved, and then adding the dispersion in step (1) for contact reaction to obtain a reaction mixture;

[0022] (3) Centrifuging the reaction mixture to collect the solid material, and then alternately washing the solid material with water and ethanol and drying to obtain the polydopamine-modified metal disulfide.

[0023] As a preferred technical solution of the present invention, in step (1), the dosage ratio of the metal disulfide to the water is (0.5 - 2) mg:1 mL, such as 0.5 mg:1 mL, 0.7 mg:1 mL, 0.8 mg:1 mL, 0.9 mg:1 mL, 1 mg:1 mL, 1.2 mg:1 mL, 1.3 mg:1 mL, 1.5 mg:1 mL, 1.6 mg:1 mL, 1.8 mg:1 mL or 2 mg:1 mL, and preferably (0.8 - 1) mg:1 mL.

[0024] There is no special limitation on the dispersion method in step (1) of the present invention, and it can be a conventional dispersion method in the art, which will not be elaborated herein.

[0025] As a preferred technical solution of the present invention, in step (2), the dosage ratio of dopamine hydrochloride to Tris buffer is (1.5 - 3) mg:1 mL, such as 1.5 mg:1 mL, 1.8 mg:1 mL, 2 mg:1 mL, 2.2 mg:1 mL, 2.5 mg:1 mL or 3 mg:1 mL, and preferably (1.8 - 2) mg:1 mL.

[0026] In the present invention, the main component of the Tris buffer is tris(hydroxymethyl)aminomethane (Tris), and its main function is to maintain the pH value of the system within a specific range by adjusting the ratio of Tris base (weak base) to its conjugate acid (Tris-H+) in the solution. Generally, the pH is adjusted with HCl. In the present invention, the pH value of the Tris buffer is 8.5.

[0027] As a preferred technical solution of the present invention, in step (2), the mass ratio of the metal disulfide in the dispersion material to the mass of dopamine hydrochloride is 1:(3 - 5).

[0028] As a preferred technical solution of the present invention, in step (2), the conditions for the contact reaction include: reacting at room temperature for 18 - 30 hours.

[0029] In step (3) of the present invention, there is no special limitation on the means of centrifugation. For example, centrifugation is carried out at 10000 - 15000 rpm for 10 - 20 minutes.

[0030] In step (3) of the present invention, there is no special limitation on the means of drying. For example, vacuum drying is carried out at 50 - 70 °C for 12 - 20 hours.

[0031] The rust inhibitor in the present invention can be a conventional rust inhibitor in the art, such as zinc naphthenate, dodecenyl succinic acid T746, triethanolamine oleate soap, barium petroleum sulfonate T701, etc.

[0032] As a preferred technical solution of the present invention, the emulsifier is selected from non-ionic emulsifiers.

[0033] As a preferred technical solution of the present invention, the non-ionic emulsifier is selected from fatty alcohol polyoxyethylene ethers.

[0034] In the present invention, a specific model of fatty alcohol polyoxyethylene ether that can be listed is MOA-9.

[0035] The second aspect of the present invention provides a preparation method of the environment-friendly drawing oil described in the first aspect of the present invention. The preparation method includes: sequentially adding polydopamine-modified metal disulfide and a rust inhibitor to the base oil, stirring each step at 50 - 70 °C for 10 - 30 minutes until homogeneous, then adding molybdenum dialkyldithiocarbamate and an emulsifier, shearing and dispersing at 65 - 70 °C for 1 - 2 hours, and then filtering through a 5-micron filter element to obtain the environment-friendly drawing oil.

[0036] Compared with the prior art, the present invention has at least the following beneficial effects:

[0037] 1. The drawing oil in the present invention has the ability to provide effective lubrication, reduce friction and wear during the metal stamping process;

[0038] 2. The stretching oil in the present invention has excellent thermal and cold stability;

[0039] 3. It can be better cleaned after use in the present invention. Specific Embodiments

[0040] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0041] Example 1

[0042] Preparation of polydopamine-modified metal disulfide:

[0043] (1) Tungsten disulfide and molybdenum disulfide with a mass ratio of 1:0.6 are dispersed in water to obtain a dispersion material. The total amount of tungsten disulfide (average particle size of 3 microns) and molybdenum disulfide (average particle size of 3 microns) and the amount of water are in a ratio of 0.8 mg: 1 mL;

[0044] (2) Dopamine hydrochloride and Tris buffer solution (pH value of 8.5) are mixed until dopamine hydrochloride is completely dissolved, and then the dispersion material in step (1) is added (the total mass of tungsten disulfide and molybdenum disulfide in the dispersion material and the mass of dopamine hydrochloride are in a ratio of 1:4), and the reaction is carried out at room temperature for 24 hours to obtain a reaction material. The dosage of dopamine hydrochloride and the dosage of Tris buffer solution are in a ratio of 2 mg: 1 mL;

[0045] (3) The reaction material is centrifuged at 12,000 rpm for 15 minutes to collect the solid material, and then the solid material is alternately washed with water and ethanol and then vacuum dried at 60 °C for 18 hours to obtain polydopamine-modified metal disulfide.

[0046] Preparation of stretching oil:

[0047] S1 By weight, prepare 80 parts of GTL base oil, 20 parts of epoxy soybean oil, 10 parts of the above-prepared polydopamine-modified metal disulfide, 5 parts of dodecenyl succinic acid T746, 5 parts of fatty alcohol polyoxyethylene ether MOA-9, and 2 parts of molybdenum dialkyldithiocarbamate (Runze brand F1510);

[0048] S2 adds GTL base oil and epoxidized soybean oil to a blending kettle, stirs at a constant temperature of 60 °C for 30 minutes, then sequentially adds polydopamine-modified metal disulfide and dodecenyl succinic acid T746, and stirs for 20 minutes at each step at 60 °C until homogeneous; then adds molybdenum dialkyldithiocarbamate and fatty alcohol polyoxyethylene ether MOA-9, shears and disperses at 70 °C for 1.5 hours, and then obtains the drawing oil after filtering through a 5-micron filter element.

[0049] Example 2

[0050] Preparation of polydopamine-modified metal disulfide:

[0051] (1) Disperses tungsten disulfide and molybdenum disulfide with a mass ratio of 1:0.5 in water to obtain a dispersion. The total amount of tungsten disulfide (average particle size of 3 microns) and molybdenum disulfide (average particle size of 3 microns) and the amount of water are in a ratio of 1 mg:1 mL;

[0052] (2) Mixes dopamine hydrochloride and Tris buffer solution (pH value of 8.5) until dopamine hydrochloride is completely dissolved, and then adds the dispersion in step (1) (the total mass of tungsten disulfide and molybdenum disulfide in the dispersion and the mass of dopamine hydrochloride are in a ratio of 1:5), and reacts at room temperature for 24 hours to obtain a reaction material. The dosage of dopamine hydrochloride and the dosage of Tris buffer solution are in a ratio of 2 mg:1 mL;

[0053] (3) Centrifuges the reaction material at 15000 rpm for 20 minutes to collect the solid material, then alternately washes the solid material with water and ethanol, and then dries it under vacuum at 60 °C for 12 hours to obtain polydopamine-modified metal disulfide.

[0054] Preparation of drawing oil:

[0055] S1 By weight, prepare 82 parts of GTL base oil, 18 parts of epoxidized soybean oil, 12 parts of the above-prepared polydopamine-modified metal disulfide, 4 parts of dodecenyl succinic acid T746, 4 parts of fatty alcohol polyoxyethylene ether MOA-9, and 1.5 parts of molybdenum dialkyldithiocarbamate (Runze brand F1510);

[0056] S2 adds GTL base oil and epoxidized soybean oil to a blending kettle, stirs at a constant temperature of 60 °C for 30 minutes, then sequentially adds polydopamine-modified metal disulfide and dodecenyl succinic acid T746, and stirs for 20 minutes at each step at 60 °C until homogeneous; then adds molybdenum dialkyldithiocarbamate and fatty alcohol polyoxyethylene ether MOA-9, shears and disperses at 70 °C for 1.5 hours, and then obtains the drawing oil after filtering through a 5-micron filter element.

[0057] Example 3

[0058] Preparation of polydopamine-modified metal disulfide:

[0059] (1) Disperse tungsten disulfide in water to obtain a dispersion. The dosage ratio of tungsten disulfide (average particle size is 3 microns) to water is 0.8 mg: 1 mL;

[0060] (2) Mix dopamine hydrochloride with Tris buffer solution (pH value is 8.5) until dopamine hydrochloride is completely dissolved. Then add the dispersion in step (1) (the mass ratio of tungsten disulfide in the dispersion to the mass of dopamine hydrochloride is 1:4) and react at room temperature for 24 hours to obtain a reaction material. The dosage ratio of dopamine hydrochloride to Tris buffer solution is 2 mg: 1 mL;

[0061] (3) Centrifuge the reaction material at 12,000 rpm for 15 minutes to collect the solid material. Then wash the solid material alternately with water and ethanol and perform vacuum drying at 60 °C for 18 hours to obtain polydopamine-modified metal disulfide.

[0062] Preparation of drawing oil:

[0063] S1 By weight, prepare 80 parts of GTL base oil, 20 parts of epoxy soybean oil, 10 parts of the above-prepared polydopamine-modified metal disulfide, 5 parts of dodecenyl succinic acid T746, 5 parts of fatty alcohol polyoxyethylene ether MOA-9, and 2 parts of molybdenum dialkyldithiocarbamate (Runze brand F1510);

[0064] S2 Add GTL base oil and epoxy soybean oil to a blending kettle, stir at a constant temperature of 60 °C for 30 minutes. Then successively add polydopamine-modified metal disulfide and dodecenyl succinic acid T746, and stir for 20 minutes at each step at 60 °C until homogeneous; then add molybdenum dialkyldithiocarbamate and fatty alcohol polyoxyethylene ether MOA-9, shear and disperse at 70 °C for 1.5 hours, and then filter through a 5-micron filter element to obtain drawing oil.

[0065] Example 4

[0066] Preparation of polydopamine-modified metal disulfide:

[0067] (1) Disperse molybdenum disulfide in water to obtain a dispersion. The dosage ratio of molybdenum disulfide (average particle size is 3 microns) to water is 0.8 mg: 1 mL;

[0068] (2) Mix dopamine hydrochloride with Tris buffer solution (pH value is 8.5) until dopamine hydrochloride is completely dissolved. Then add the dispersion in step (1) (the mass ratio of molybdenum disulfide in the dispersion to the mass of dopamine hydrochloride is 1:4) and react at room temperature for 24 hours to obtain a reaction material. The dosage ratio of dopamine hydrochloride to Tris buffer solution is 2 mg: 1 mL;

[0069] (3) Centrifuge the reaction material at 12,000 rpm for 15 minutes to collect the solid material. Then, alternately wash the solid material with water and ethanol, and vacuum dry it at 60 °C for 18 hours to obtain polydopamine-modified metal disulfide.

[0070] Preparation of drawing oil:

[0071] S1 By weight, prepare 80 parts of GTL base oil, 20 parts of epoxidized soybean oil, 10 parts of the above-prepared polydopamine-modified metal disulfide, 5 parts of dodecenyl succinic acid T746, 5 parts of fatty alcohol polyoxyethylene ether MOA-9, and 2 parts of molybdenum dialkyldithiocarbamate (Runze brand F1510);

[0072] S2 Add the GTL base oil and epoxidized soybean oil to a blending kettle, stir at a constant temperature of 60 °C for 30 minutes, then sequentially add the polydopamine-modified metal disulfide and dodecenyl succinic acid T746, and stir for 20 minutes at each step at 60 °C until homogeneous; then add molybdenum dialkyldithiocarbamate and fatty alcohol polyoxyethylene ether MOA-9, shear and disperse at 70 °C for 1.5 hours, and then filter through a 5-micron filter element to obtain the drawing oil.

[0073] Example 5

[0074] Preparation of polydopamine-modified metal disulfide:

[0075] (1) Disperse tungsten disulfide and molybdenum disulfide with a mass ratio of 1:0.6 in water to obtain a dispersion material. The total amount of tungsten disulfide (average particle size of 3 microns) and molybdenum disulfide (average particle size of 3 microns) and the amount of water are in a ratio of 0.8 mg:1 mL;

[0076] (2) Mix dopamine hydrochloride with Tris buffer solution (pH value of 8.5) until the dopamine hydrochloride is completely dissolved, and then add the dispersion material in step (1) (the total mass of tungsten disulfide and molybdenum disulfide in the dispersion material and the mass of dopamine hydrochloride are in a ratio of 1:4), and react at room temperature for 24 hours to obtain a reaction material. The dosage of dopamine hydrochloride and the dosage of Tris buffer solution are in a ratio of 2 mg:1 mL;

[0077] (3) Centrifuge the reaction material at 12,000 rpm for 15 minutes to collect the solid material. Then, alternately wash the solid material with water and ethanol, and vacuum dry it at 60 °C for 18 hours to obtain polydopamine-modified metal disulfide.

[0078] Preparation of drawing oil:

[0079] S1. Prepare 100 parts by weight of GTL base oil, 10 parts of the polydopamine-modified metal disulfide prepared above, 5 parts of dodecyl succinic acid T746, 5 parts of fatty alcohol polyoxyethylene ether MOA-9, and 2 parts of molybdenum dialkyldithiocarbamate (Runze brand F1510);

[0080] S2. Add the GTL base oil to a blending kettle, and then successively add the polydopamine-modified metal disulfide and dodecyl succinic acid T746, and stir for 20 minutes at each step at 60 °C until homogeneous; then add molybdenum dialkyldithiocarbamate and fatty alcohol polyoxyethylene ether MOA-9, shear and disperse at 70 °C for 1.5 hours, and then filter through a 5-micron filter element to obtain the drawing oil.

[0081] Comparative Example 1

[0082] Preparation of drawing oil:

[0083] S1. Prepare 80 parts by weight of GTL base oil, 20 parts of epoxy soybean oil, 6 parts of tungsten disulfide, 4 parts of molybdenum disulfide, 5 parts of dodecyl succinic acid T746, 5 parts of fatty alcohol polyoxyethylene ether MOA-9, and 2 parts of molybdenum dialkyldithiocarbamate (Runze brand F1510);

[0084] S2. Add the GTL base oil and epoxy soybean oil to a blending kettle, stir at a constant temperature of 60 °C for 30 minutes, and then successively add tungsten disulfide, molybdenum disulfide, and dodecyl succinic acid T746, and stir for 20 minutes at each step at 60 °C until homogeneous; then add molybdenum dialkyldithiocarbamate and fatty alcohol polyoxyethylene ether MOA-9, shear and disperse at 70 °C for 1.5 hours, and then filter through a 5-micron filter element to obtain the drawing oil.

[0085] Performance test

[0086] 1. Stamping experiment: Pour the drawing oil onto the surface of a 1-mm-thick 304 stainless steel plate, and then continuously stamp the stainless steel plate using the same mold, and record the number of stampings before obvious wear of the mold;

[0087] 2. Cleanability: Coat the drawing oil on a steel plate (100×100 mm), then rinse with water at 70 °C for 5 minutes, and weigh after drying to calculate the cleaning rate;

[0088] 3. Stability: After storing the oil product at -20 °C for 30 days, continue to store it at 60 °C for 30 days and then take it out. Observe whether there is layering or precipitation. If there is no layering or precipitation, it is qualified; otherwise, it is unqualified.

[0089] The performance test results of the drawing oil are shown in Table 1.

[0090] Table 1 Performance test results of the drawing oil

[0091]

[0092]

[0093] From the test results in Table 1, the environment-friendly stretching oil in the present invention has excellent lubrication and wear resistance and cleaning performance.

[0094] The above are the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. An environmentally friendly stretching oil, characterized in that, By weight parts, the drawing oil comprises: 100 parts of base oil, 5 - 20 parts of polydopamine - modified metal disulfide, 1 - 10 parts of rust inhibitor, 1 - 10 parts of emulsifier, and 0.5 - 5 parts of molybdenum dialkyldithiocarbamate.

2. The stretching oil according to claim 1, characterized in that, The drawing oil comprises: 100 parts of base oil, 8 - 12 parts of polydopamine - modified metal disulfide, 4 - 6 parts of rust inhibitor, 4 - 6 parts of emulsifier, and 1.5 - 2.5 parts of molybdenum dialkyldithiocarbamate.

3. The stretching oil according to claim 1 or 2, characterized in that, The base oil contains GTL base oil.

4. The stretching oil according to claim 3, characterized in that, The base oil further contains epoxidized soybean oil.

5. The stretching oil according to claim 1 or 2, characterized in that, The metal disulfide in the polydopamine - modified metal disulfide is selected from tungsten disulfide and / or molybdenum disulfide.

6. The stretching oil according to claim 1 or 2, characterized in that, The preparation method of the polydopamine - modified metal disulfide comprises: (1) Dispersing the metal disulfide in water to obtain a dispersion; (2) Mixing dopamine hydrochloride with Tris buffer until dopamine hydrochloride is completely dissolved, and then adding the dispersion in step (1) for contact reaction to obtain a reaction mixture; (3) Centrifuging the reaction mixture to collect the solid material, then alternately washing the solid material with water and ethanol and then drying to obtain the polydopamine - modified metal disulfide.

7. The stretching oil according to claim 6, wherein, In step (1), the dosage ratio of the metal disulfide to the water is (0.5 - 2) mg: 1 mL.

8. The stretching oil according to claim 6, characterized in that, In step (1) and step (2), the dosage ratio of dopamine hydrochloride to Tris buffer is (1.5 - 3) mg: 1 mL; in step (2), the mass ratio of the metal disulfide in the dispersion to the mass of dopamine hydrochloride is 1: (3 - 5); in step (2), the conditions of the contact reaction include: reacting at room temperature for 18 - 30 hours.

9. The stretching oil according to claim 1 or 2, characterized in that, The emulsifier is selected from non - ionic emulsifiers.

10. A method for preparing the environmentally friendly stretching oil according to any one of claims 1-9, characterized in that The preparation method comprises: sequentially adding polydopamine - modified metal disulfide and rust inhibitor to the base oil, stirring each step at 50 - 70 °C for 10 - 30 minutes until homogeneous, then adding molybdenum dialkyldithiocarbamate and emulsifier, shearing and dispersing at 65 - 70 °C for 1 - 2 hours, and then filtering through a 5 - micron filter element to obtain the environment - friendly drawing oil.

Images