Anti-wear composite hydraulic oil and preparation method thereof

Abstract

The invention relates to anti-wear composite hydraulic oil and a preparation method thereof, and belongs to the technical field of hydraulic oil. The wear-resistant composite hydraulic oil is prepared from the following components: base oil, polymethacrylate, modified molybdenum disulfide and other auxiliaries, the base oil is 350N base oil; the other auxiliary agent is polyvinyl alcohol; the preparation method of the modified molybdenum disulfide comprises the following steps: in a nitrogen atmosphere, putting molybdenum disulfide into a microwave generator for high-temperature pressure control treatment, introducing mixed gas for vapor deposition, adding isopropyl alcohol for uniform mixing, adding a phenol derivative for heating and stirring treatment, adding an auxiliary agent and an aniline derivative for heating and stirring treatment, cooling, filtering, washing with alcohol, and drying. And adding the magnolol and the initiator, stirring at a constant temperature, filtering, cleaning and drying to obtain the high-temperature-resistant epoxy resin. According to the wear-resistant composite hydraulic oil prepared by the preparation method disclosed by the invention, all the components are coordinated and matched, so that the hydraulic oil shows excellent oxidation resistance and stability and also has excellent wear resistance.

Description

Technical Field

[0001] The invention belongs to the technical field of hydraulic oil and relates to an anti-wear composite hydraulic oil and a preparation method thereof. Background Art

[0002] Anti-wear hydraulic oil, also known as HM hydraulic oil, can be traced back to the history of rust-proof and anti-oxidation hydraulic oil. This oil is made by carefully adding specific additives to mineral oil. Anti-wear hydraulic oil is designed for hydraulic systems that use liquid pressure energy as a hydraulic medium. It plays a variety of key roles in hydraulic systems, such as energy transmission, system lubrication, corrosion protection, rust prevention, and cooling. This oil is widely used in many fields such as automotive brake systems, lifting machinery, bulldozers, aircraft and ships.

[0003] Molybdenum disulfide is a material widely used in the lubrication field. Its unique layered structure and excellent lubrication properties make it an ideal additive for hydraulic oil. Molybdenum disulfide can significantly reduce the friction coefficient and enhance the anti-wear performance of hydraulic oil. Even under extreme conditions of high temperature and high pressure, it can still maintain excellent lubrication effect. However, the dispersibility of molybdenum disulfide will affect its performance in hydraulic oil. In addition, hydraulic oil is prone to oxidation during application, and this oxidation reaction will be accelerated under the influence of high temperature and metal catalysis. The oxidation of hydraulic oil will shorten its service life and affect the normal operation of mechanical devices. Summary of the invention

[0004] The purpose of the present invention is to provide an anti-wear composite hydraulic oil and a preparation method thereof. The anti-wear composite hydraulic oil prepared by the present invention has synergistic cooperation between various components, so that the hydraulic oil exhibits excellent antioxidant performance and stability, and also has excellent anti-wear performance.

[0005] The purpose of the present invention can be achieved through the following technical solutions: An anti-wear composite hydraulic oil comprises the following components by weight: 100-110 parts of base oil, 6-8 parts of polymethacrylate, 3-4 parts of modified molybdenum disulfide and 0.08-0.10 parts of other additives.

[0006] As a preferred technical solution of the present invention, the base oil is 350N base oil; the other additive is polyvinyl alcohol; The invention discloses a preparation method of the modified molybdenum disulfide, which comprises the following steps: Step 1: Under a nitrogen atmosphere, molybdenum disulfide is placed in a microwave generator for high temperature and pressure control treatment, and a mixed gas is introduced for vapor deposition to obtain composite particles; Step 2: After the composite particles and isopropanol are mixed, a phenol derivative is added, and the mixture is heated and stirred. After the auxiliary agent and the aniline derivative are added, the mixture is heated and stirred, and the mixture is cooled to room temperature, filtered, washed with alcohol, and vacuum dried to obtain an intermediate; Step 3: Place the intermediate in isopropanol, stir and mix, and then preheat. Add magnolol and an initiator and stir at a constant temperature. After filtering, wash repeatedly, place in an oven and dry under vacuum to obtain modified molybdenum disulfide.

[0007] As a preferred technical solution of the present invention, in step one, the high temperature pressure controlled treatment is carried out at a temperature of 700-720°C and a pressure of 6.0 kPa; the flow rate of the mixed gas is 0.26-0.30 L / min; the amount ratio of molybdenum disulfide and the mixed gas is 5 g: 28-30 L; the mixed gas is a mixture of hydrogen and methane in a volume ratio of 1.2: 10-11.

[0008] As a preferred technical solution of the present invention, in step 2, the heating and stirring treatment is stirring at a temperature of 32-40°C for 30-40 minutes; the heating and stirring treatment is stirring at a temperature of 75-80°C for 4-5 hours; the alcohol washing is washing with anhydrous ethanol for 3 times; the vacuum drying is vacuum drying at a temperature of 80°C to constant weight; the mass ratio of the composite particles, phenol derivatives, auxiliary agents, aniline derivatives and isopropanol is 12-14: 2.4-3.0: 0.2-0.3: 2.2-2.4: 40-50; the phenol derivative is 3-(4-hydroxyphenyl) acrolein; the auxiliary agent is acetic acid; and the aniline derivative is 3,4-dimercaptoaniline.

[0009] As a preferred technical solution of the present invention, in step three, the stirring and mixing is stirring at a speed of 300-400r / min for 20-30min; the preheating is heating to 50°C at a speed of 2-3°C / min; the constant temperature stirring is stirring at a temperature of 60-70°C for 8-10h; the repeated washing is repeated washing with anhydrous ethanol for 3 times; the vacuum drying is vacuum drying at a temperature of 80°C to constant weight; the mass ratio of the intermediate, isopropanol, magnolol and initiator is 15-16:50-60:3.0-3.4:0.08-0.10; and the initiator is initiator AIBN.

[0010] A method for preparing an anti-wear composite hydraulic oil comprises the following steps: Add modified molybdenum disulfide to base oil, perform ultrasonic treatment at 50-60°C for 45-60 minutes, add polymethacrylate and polyvinyl alcohol, stir at 50-60°C for 1.5-2.0 hours to obtain the product.

[0011] Beneficial effects of the present invention: The anti-wear composite hydraulic oil prepared by the present invention has various components that cooperate with each other, so that the hydraulic oil exhibits excellent antioxidant performance and stability, and also has excellent anti-wear performance.

[0012] The present invention forms a complex between molybdenum disulfide and graphene, and then forms chemical grafting in sequence through phenol derivatives, aniline derivatives and magnolol to modify the composite particles formed by molybdenum disulfide and graphene, thereby giving molybdenum disulfide and graphene organic anti-oxidation properties, so that they work together through multiple mechanisms such as adsorption and coordination to form a dense protective film, thereby improving the corrosion resistance of the hydraulic oil and reducing friction and wear, thereby further improving the anti-wear performance of the hydraulic oil. DETAILED DESCRIPTION

[0013] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are described in detail below in combination with the embodiments. Example 1

[0014] An anti-wear composite hydraulic oil comprises the following components by weight: 100 parts of 350N base oil, 6 parts of polymethacrylate, 3 parts of modified molybdenum disulfide and 0.08 parts of polyvinyl alcohol; Wherein, the preparation method of the modified molybdenum disulfide comprises the following steps: Step 1: Under a nitrogen atmosphere, molybdenum disulfide is placed in a microwave generator for high-temperature controlled pressure treatment, and a mixed gas is introduced for vapor deposition to obtain composite particles; wherein the high-temperature controlled pressure treatment is carried out at a temperature of 700°C and a pressure of 6.0 kPa; the flow rate of the mixed gas is 0.26 L / min; the amount ratio of molybdenum disulfide to the mixed gas is 5 g: 28 L; the mixed gas is a mixture of hydrogen and methane in a volume ratio of 1.2: 10; Step 2: After mixing the composite particles and isopropanol, add the phenol derivative and stir at 32°C for 30 minutes, add the auxiliary agent and the aniline derivative and stir at 75°C for 4 hours, cool to room temperature and filter, wash with anhydrous ethanol for 3 times, and vacuum dry at 80°C to constant weight to obtain an intermediate; wherein the mass ratio of the composite particles, phenol derivatives, auxiliary agent, aniline derivative and isopropanol is 12:2.4:0.2:2.2:40; the phenol derivative is 3-(4-hydroxyphenyl)acrolein; the auxiliary agent is acetic acid; and the aniline derivative is 3,4-dimercaptoaniline; Step 3: Place the intermediate in isopropanol and stir at 300r / min for 20min, then heat to 50°C at a rate of 2°C / min, add magnolol and initiator and stir at 60°C for 8h, filter, wash repeatedly with anhydrous ethanol for 3 times, place in an oven and vacuum dry at 80°C to constant weight to obtain modified molybdenum disulfide; wherein the mass ratio of the intermediate, isopropanol, magnolol and initiator is 15:50:3.0:0.08; the initiator is initiator AIBN.

[0015] A method for preparing an anti-wear composite hydraulic oil comprises the following steps: The modified molybdenum disulfide is added to the base oil, and the mixture is ultrasonically treated at 50°C for 45 minutes. Polymethacrylate and polyvinyl alcohol are added and stirred at 50°C for 1.5 hours to obtain the product. Example 2

[0016] An anti-wear composite hydraulic oil comprises the following components by weight: 102 parts of 350N base oil, 6.5 parts of polymethacrylate, 3.2 parts of modified molybdenum disulfide and 0.09 parts of polyvinyl alcohol; Wherein, the preparation method of the modified molybdenum disulfide comprises the following steps: Step 1: Under a nitrogen atmosphere, molybdenum disulfide is placed in a microwave generator for high-temperature controlled pressure treatment, and a mixed gas is introduced for vapor deposition to obtain composite particles; wherein the high-temperature controlled pressure treatment is carried out at a temperature of 705°C and a pressure of 6.0 kPa; the flow rate of the mixed gas is 0.27 L / min; the amount ratio of molybdenum disulfide to the mixed gas is 5 g: 28.5 L; the mixed gas is a mixture of hydrogen and methane in a volume ratio of 1.2: 10.2; Step 2: After mixing the composite particles and isopropanol, add the phenol derivative and stir at 34°C for 32 minutes, add the auxiliary agent and the aniline derivative and stir at 76°C for 4.2 hours, cool to room temperature and filter, wash with anhydrous ethanol for 3 times, and vacuum dry at 80°C to constant weight to obtain an intermediate; wherein the mass ratio of the composite particles, the phenol derivative, the auxiliary agent, the aniline derivative and the isopropanol is 12.5:2.6:0.22:2.3:42; the phenol derivative is 3-(4-hydroxyphenyl)acrolein; the auxiliary agent is acetic acid; and the aniline derivative is 3,4-dimercaptoaniline; Step 3: Place the intermediate in isopropanol and stir at 320r / min for 22 minutes, then heat to 50°C at a rate of 2.5°C / min, add magnolol and initiator and stir at 62°C for 8.5 hours, filter, wash repeatedly with anhydrous ethanol for 3 times, place in an oven and vacuum dry at 80°C to constant weight to obtain modified molybdenum disulfide; wherein the mass ratio of the intermediate, isopropanol, magnolol and initiator is 15.2:52:3.1:0.09; the initiator is initiator AIBN.

[0017] A method for preparing an anti-wear composite hydraulic oil comprises the following steps: The modified molybdenum disulfide was added to the base oil, and the mixture was ultrasonically treated at 52° C. for 49 min. Polymethacrylate and polyvinyl alcohol were added and stirred at 52° C. for 1.6 h to obtain the product. Example 3

[0018] An anti-wear composite hydraulic oil comprises the following components by weight: 105 parts of 350N base oil, 7 parts of polymethacrylate, 3.5 parts of modified molybdenum disulfide and 0.09 parts of polyvinyl alcohol; Wherein, the preparation method of the modified molybdenum disulfide comprises the following steps: Step 1: Under a nitrogen atmosphere, molybdenum disulfide is placed in a microwave generator for high-temperature controlled pressure treatment, and a mixed gas is introduced for vapor deposition to obtain composite particles; wherein the high-temperature controlled pressure treatment is carried out at a temperature of 710°C and a pressure of 6.0 kPa; the flow rate of the mixed gas is 0.28 L / min; the amount ratio of molybdenum disulfide to the mixed gas is 5 g: 29 L; the mixed gas is a mixture of hydrogen and methane in a volume ratio of 1.2: 10.5; Step 2: After mixing the composite particles and isopropanol, add the phenol derivative and stir at 36°C for 35 minutes, add the auxiliary agent and the aniline derivative and stir at 78°C for 4.5 hours, cool to room temperature and filter, wash with anhydrous ethanol for 3 times, and vacuum dry at 80°C to constant weight to obtain an intermediate; wherein the mass ratio of the composite particles, phenol derivatives, auxiliary agent, aniline derivative and isopropanol is 13:2.7:0.25:2.3:45; the phenol derivative is 3-(4-hydroxyphenyl)acrolein; the auxiliary agent is acetic acid; and the aniline derivative is 3,4-dimercaptoaniline; Step 3: Place the intermediate in isopropanol and stir at 350r / min for 25 minutes, then heat to 50°C at a rate of 2.5°C / min, add magnolol and initiator and stir at 65°C for 9 hours, filter, wash repeatedly with anhydrous ethanol for 3 times, place in an oven and vacuum dry at 80°C to constant weight to obtain modified molybdenum disulfide; wherein the mass ratio of the intermediate, isopropanol, magnolol and initiator is 15.5:55:3.2:0.09; the initiator is initiator AIBN.

[0019] A method for preparing an anti-wear composite hydraulic oil comprises the following steps: The modified molybdenum disulfide was added to the base oil, and the mixture was ultrasonically treated at 55°C for 52 minutes. Polymethacrylate and polyvinyl alcohol were added and stirred at 55°C for 1.8 hours to obtain the product. Example 4

[0020] An anti-wear composite hydraulic oil comprises the following components by weight: 108 parts of 350N base oil, 7.5 parts of polymethacrylate, 3.8 parts of modified molybdenum disulfide and 0.09 parts of polyvinyl alcohol; Wherein, the preparation method of the modified molybdenum disulfide comprises the following steps: Step 1: Under a nitrogen atmosphere, molybdenum disulfide is placed in a microwave generator for high-temperature controlled pressure treatment, and a mixed gas is introduced for vapor deposition to obtain composite particles; wherein the high-temperature controlled pressure treatment is carried out at a temperature of 715°C and a pressure of 6.0 kPa; the flow rate of the mixed gas is 0.29 L / min; the amount ratio of molybdenum disulfide to the mixed gas is 5 g: 29.5 L; the mixed gas is a mixture of hydrogen and methane in a volume ratio of 1.2: 10.8; Step 2: After mixing the composite particles and isopropanol, add the phenol derivative and stir at 38°C for 38 minutes, add the auxiliary agent and the aniline derivative and stir at 79°C for 4.8 hours, cool to room temperature and filter, wash with anhydrous ethanol for 3 times, and vacuum dry at 80°C to constant weight to obtain an intermediate; wherein the mass ratio of the composite particles, the phenol derivative, the auxiliary agent, the aniline derivative and isopropanol is 13.5:2.8:0.28:2.3:48; the phenol derivative is 3-(4-hydroxyphenyl)acrolein; the auxiliary agent is acetic acid; and the aniline derivative is 3,4-dimercaptoaniline; Step 3: Place the intermediate in isopropanol and stir at 370r / min for 28 minutes, then heat to 50°C at a rate of 2.5°C / min, add magnolol and initiator and stir at 68°C for 9.5h, filter, wash repeatedly with anhydrous ethanol for 3 times, place in an oven and vacuum dry at 80°C to constant weight to obtain modified molybdenum disulfide; wherein the mass ratio of the intermediate, isopropanol, magnolol and initiator is 15.8:58:3.3:0.09; the initiator is initiator AIBN.

[0021] A method for preparing an anti-wear composite hydraulic oil comprises the following steps: The modified molybdenum disulfide was added to the base oil, and the mixture was ultrasonically treated at 58° C. for 56 min. Polymethacrylate and polyvinyl alcohol were added and stirred at 58° C. for 1.9 h to obtain the product. Example 5

[0022] An anti-wear composite hydraulic oil comprises the following components by weight: 110 parts of 350N base oil, 8 parts of polymethacrylate, 4 parts of modified molybdenum disulfide and 0.10 parts of polyvinyl alcohol; Wherein, the preparation method of the modified molybdenum disulfide comprises the following steps: Step 1: Under a nitrogen atmosphere, molybdenum disulfide is placed in a microwave generator for high-temperature controlled pressure treatment, and a mixed gas is introduced for vapor deposition to obtain composite particles; wherein the high-temperature controlled pressure treatment is carried out at a temperature of 720°C and a pressure of 6.0 kPa; the flow rate of the mixed gas is 0.30 L / min; the amount ratio of molybdenum disulfide to the mixed gas is 5 g:30 L; the mixed gas is a mixture of hydrogen and methane in a volume ratio of 1.2:11; Step 2: After mixing the composite particles and isopropanol, add the phenol derivative and stir at 40°C for 40 minutes, add the auxiliary agent and the aniline derivative and stir at 80°C for 5 hours, cool to room temperature and filter, wash with anhydrous ethanol for 3 times, and vacuum dry at 80°C to constant weight to obtain an intermediate; wherein the mass ratio of the composite particles, the phenol derivative, the auxiliary agent, the aniline derivative and isopropanol is 14:3.0:0.3:2.4:50; the phenol derivative is 3-(4-hydroxyphenyl)acrolein; the auxiliary agent is acetic acid; and the aniline derivative is 3,4-dimercaptoaniline; Step 3: Place the intermediate in isopropanol and stir at 400r / min for 30min, then heat to 50°C at a rate of 3°C / min, add magnolol and initiator and stir at 70°C for 10h, filter, wash repeatedly with anhydrous ethanol for 3 times, place in an oven and vacuum dry at 80°C to constant weight to obtain modified molybdenum disulfide; wherein the mass ratio of the intermediate, isopropanol, magnolol and initiator is 16:60:3.4:0.10; the initiator is initiator AIBN.

[0023] A method for preparing an anti-wear composite hydraulic oil comprises the following steps: The modified molybdenum disulfide is added to the base oil, and the mixture is ultrasonically treated at 60°C for 60 minutes. Polymethacrylate and polyvinyl alcohol are added and stirred at 60°C for 2.0 hours to obtain the product.

[0024] Comparative Example 1 Compared with Example 4, the difference in Comparative Example 1 is that step 1 is not performed in Comparative Example 1, molybdenum disulfide is used instead of the composite particles, and the other components, preparation steps and parameters are the same.

[0025] Comparative Example 2 Compared with Example 4, Comparative Example 2 is different in that phenyl acrolein replaces the phenol derivative, and the other components, preparation steps and parameters are the same.

[0026] Comparative Example 3 Compared with Example 4, Comparative Example 3 is different in that no phenol derivative is used, and the remaining components, preparation steps and parameters are the same.

[0027] Comparative Example 4 Compared with Example 4, Comparative Example 4 is different in that aniline is used instead of the aniline derivative, and the other components, preparation steps and parameters are the same.

[0028] Comparative Example 5 Compared with Example 4, Comparative Example 5 is different in that magnolol is not used, and the other components, preparation steps and parameters are the same.

[0029] The hydraulic oils prepared in Examples 1-5 and Comparative Examples 1-5 were subjected to the following performance tests, respectively. The test results are shown in Table 1.

[0030] Copper sheet corrosion test: According to GB / T 5096-2017, test temperature 120℃, time 3h; Anti-wear performance test: According to NB / SH / T 0189-2017; parameters: 75℃ temperature, 1200r / min speed, 1h time, 300N load; Table 1 Copper corrosion (grade) Wear spot diameter (mm) Example 1 1a 0.40 Example 2 1a 0.43 Example 3 1a 0.44 Example 4 1a 0.38 Example 5 1a 0.41 Comparative Example 1 2c 0.68 Comparative Example 2 2b 0.61 Comparative Example 3 2c 0.67 Comparative Example 4 2b 0.57 Comparative Example 5 2b 0.55 It can be seen from the test results in Table 1 that, compared with comparative examples 1-5, embodiments 1-5 of the present invention have good corrosion resistance by adding modified molybdenum disulfide to the hydraulic oil, and at the same time reduce the wear spot diameter of the hydraulic oil, thereby having better wear resistance.

[0031] Through comparative analysis, it can be known that this is because the present invention generates graphene on the surface of molybdenum disulfide by vapor deposition method, which can improve the dispersibility of molybdenum disulfide in hydraulic oil and avoid its agglomeration. The composite of the two can form a more dense and uniform two-dimensional protective layer, effectively isolate corrosive substances, reduce corrosion on the metal surface, and better play its lubrication and anti-corrosion effects. The present invention forms chemical grafting in sequence through phenol derivatives, aniline derivatives and magnolol to modify the composite particles formed by molybdenum disulfide and graphene. The introduced catechol structure, imine group, biphenol structure and sulfur-containing group can work together through various mechanisms such as adsorption and coordination between phenolic hydroxyl groups and thiol groups and the active sites on the metal surface to form a dense protective film, which improves corrosion resistance while reducing friction and wear, and further improves wear resistance. In addition, the modification of the composite particles can effectively improve the dispersibility of molybdenum disulfide and graphene in the hydraulic oil system, so that the wear resistance can be better exerted.

[0032] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any indirect modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. An anti-wear composite hydraulic oil, characterized in that: The following components are included by weight: 100-110 parts of base oil, 6-8 parts of polymethacrylate, 3-4 parts of modified molybdenum disulfide and 0.08-0.10 parts of other additives; Wherein, the preparation method of the modified molybdenum disulfide comprises the following steps: Step 1: Under a nitrogen atmosphere, molybdenum disulfide is placed in a microwave generator for high temperature and pressure control treatment, and a mixed gas is introduced for vapor deposition to obtain composite particles; the molybdenum disulfide and the mixed gas are used in an amount ratio of 5g:28-30L; the mixed gas is a mixture of hydrogen and methane in a volume ratio of 1.2:10-11; Step 2: After the composite particles and isopropanol are mixed, a phenol derivative is added, and the mixture is heated and stirred. After the auxiliary agent and the aniline derivative are added, the mixture is heated and stirred, and the mixture is cooled to room temperature, filtered, washed with alcohol, and vacuum dried to obtain an intermediate. The mass ratio of the composite particles, the phenol derivative, the auxiliary agent, the aniline derivative, and the isopropanol is 12-14: 2.4-3.0: 0.2-0.3: 2.2-2.4: 40-50. The phenol derivative is 3-(4-hydroxyphenyl) acrolein; the auxiliary agent is acetic acid; and the aniline derivative is 3,4-dimercaptoaniline. Step 3: Place the intermediate in isopropanol, stir and mix, then preheat, add magnolol and initiator and stir at constant temperature, filter and wash repeatedly, place in an oven and vacuum dry to obtain modified molybdenum disulfide; the mass ratio of the intermediate, isopropanol, magnolol and initiator is 15-16:50-60:3.0-3.4:0.08-0.10; the initiator is initiator AIBN.

2. The anti-wear composite hydraulic oil according to claim 1, characterized in that: The base oil is 350N base oil; and the other additive is polyvinyl alcohol.

3. The anti-wear composite hydraulic oil according to claim 1, characterized in that: In step 1, the high temperature and pressure controlled treatment is carried out at a temperature of 700-720° C. and an air pressure of 6.0 kPa.

4. The anti-wear composite hydraulic oil according to claim 1, characterized in that: In step 1, the flow rate of the mixed gas is 0.26-0.30 L / min.

5. The anti-wear composite hydraulic oil according to claim 1, characterized in that: In step 2, the heating and stirring treatment is stirring at a temperature of 32-40° C. for 30-40 minutes; the alcohol washing is washing with anhydrous ethanol for 3 times; and the vacuum drying is vacuum drying at a temperature of 80° C. to constant weight.

6. The anti-wear composite hydraulic oil according to claim 1, characterized in that: In step 2, the heating and stirring treatment is stirring at 75-80° C. for 4-5 hours.

7. The anti-wear composite hydraulic oil according to claim 1, characterized in that: In step three, the stirring and mixing is stirring at a speed of 300-400 r / min for 20-30 minutes; the preheating is heating to 50°C at a speed of 2-3°C / min; the repeated washing is repeated washing with anhydrous ethanol for 3 times; and the vacuum drying is vacuum drying at a temperature of 80°C to constant weight.

8. The anti-wear composite hydraulic oil according to claim 1, characterized in that: In step three, the constant temperature stirring is stirring at 60-70° C. for 8-10 hours.

9. A method for preparing the anti-wear composite hydraulic oil according to any one of claims 1 to 8, characterized in that: The preparation method comprises the following steps: adding modified molybdenum disulfide to base oil, ultrasonically treating at 50-60°C for 45-60 minutes, adding polymethacrylate and polyvinyl alcohol and stirring at 50-60°C for 1.5-2.0 hours to obtain the product.