Anti-wear composite hydraulic oil and preparation method thereof

Abstract

The present invention relates to an anti-wear composite hydraulic oil and a preparation method thereof, and belongs to the technical field of hydraulic oil. An anti-wear composite hydraulic oil comprises the following components: base oil, polymethacrylate, modified molybdenum disulfide and other additives; the base oil is 350N base oil; the other additives are polyvinyl alcohol; the preparation of modified molybdenum disulfide comprises: in a nitrogen atmosphere, placing molybdenum disulfide in a microwave generator for high-temperature pressure control treatment, introducing a mixed gas for vapor deposition, adding isopropanol to mix, adding a phenol derivative for heating and stirring treatment, adding an additive and an aniline derivative for heating and stirring treatment, cooling, filtering, washing with alcohol, drying, placing in isopropanol for stirring and mixing, preheating, adding magnolol and an initiator for constant temperature stirring, filtering, washing, and drying. The anti-wear composite hydraulic oil prepared by the present invention has synergistic cooperation between the components, so that the hydraulic oil exhibits excellent antioxidant performance and stability, and has excellent anti-wear performance.

Description

Technical Field

[0001] This invention belongs to the technical field of hydraulic oil, and relates to an anti-wear composite hydraulic oil and its preparation method. Background Technology

[0002] Anti-wear hydraulic oil, also known as HM hydraulic oil, traces its history back to rust-preventive and oxidation-resistant hydraulic oils. This type of oil is made by carefully adding specific additives to mineral oil. Specifically designed for hydraulic systems that utilize fluid pressure energy as the hydraulic medium, anti-wear hydraulic oil plays multiple crucial roles in these systems, including energy transfer, system lubrication, corrosion prevention, rust prevention, and cooling. This oil is widely used in automotive braking systems, crane machinery, bulldozing equipment, aircraft, and ships, among other fields.

[0003] Molybdenum disulfide (MoS2) is a widely used material in the lubrication field. Its unique layered structure and excellent lubrication properties make it an ideal additive for hydraulic oils. MoS2 significantly reduces the coefficient of friction and enhances the anti-wear properties of hydraulic oils. Even under extreme conditions of high temperature and high pressure, it maintains excellent lubrication performance. However, the dispersibility of MoS2 affects its performance in hydraulic oils. Furthermore, hydraulic oils are prone to oxidation during application, and this oxidation reaction is accelerated under the influence of high temperature and metal catalysis. Oxidation of hydraulic oil shortens its service life and affects the normal operation of mechanical components. Summary of the Invention

[0004] The purpose of this invention is to provide an anti-wear composite hydraulic oil and its preparation method. The anti-wear composite hydraulic oil prepared by this invention has synergistic effects among its components, which makes the hydraulic oil exhibit excellent anti-oxidation properties and stability, as well as excellent anti-wear properties.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] An anti-wear composite hydraulic oil comprises the following components by weight: 100-110 parts base oil, 6-8 parts polymethyl methacrylate, 3-4 parts modified molybdenum disulfide, and 0.08-0.10 parts other additives.

[0007] In a preferred embodiment of the present invention, the base oil is 350N base oil; the other additives are polyvinyl alcohol.

[0008] This invention discloses a method for preparing the modified molybdenum disulfide, the method comprising the following steps:

[0009] Step 1: Under a nitrogen atmosphere, molybdenum disulfide is placed in a microwave generator for high-temperature and pressure-controlled treatment, and a mixed gas is introduced for vapor phase deposition to obtain composite particles.

[0010] Step 2: After mixing the composite particles and isopropanol, add the phenol derivative and heat and stir. Add the additives and aniline derivative, heat and stir, cool to room temperature, filter, wash with alcohol, and vacuum dry to obtain the intermediate.

[0011] Step 3: After mixing the intermediate in isopropanol and preheating, magnolol and initiator are added and stirred at a constant temperature. After filtration and repeated washing, the mixture is placed in an oven for vacuum drying to obtain modified molybdenum disulfide.

[0012] As a preferred embodiment of the present invention, in step one, the high-temperature pressure control treatment is carried out at a temperature of 700-720℃ and a pressure of 6.0 kPa; the flow rate of the mixed gas is 0.26-0.30 L / min; the ratio of molybdenum disulfide to the mixed gas is 5 g: 28-30 L; the mixed gas is composed of hydrogen and methane mixed at a volume ratio of 1.2: 10-11.

[0013] As a preferred embodiment of the present invention, in step two, the heating and stirring treatment is performed by stirring at 32-40℃ for 30-40 minutes; the heating and stirring treatment is performed by stirring at 75-80℃ for 4-5 hours; the alcohol washing is performed by washing three times with anhydrous ethanol; the vacuum drying is performed by vacuum drying at 80℃ to constant weight; the mass ratio of the composite particles, phenol derivative, auxiliaries, aniline derivative 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)propenal; the auxiliaries are acetic acid; and the aniline derivative is 3,4-dimercaptoaniline.

[0014] As a preferred embodiment of the present invention, in step three, the stirring and mixing is carried out at a speed of 300-400 r / min for 20-30 min; the preheating is carried out at a rate of 2-3 °C / min to 50 °C; the constant temperature stirring is carried out at a temperature of 60-70 °C for 8-10 h; the repeated washing is carried out by repeatedly washing with anhydrous ethanol 3 times; the vacuum drying is carried out by 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 AIBN.

[0015] A method for preparing an anti-wear composite hydraulic oil includes the following steps:

[0016] Modified molybdenum disulfide is added to the base oil and ultrasonically treated at 50-60℃ for 45-60 min. Polymethyl methacrylate and polyvinyl alcohol are then added and stirred at 50-60℃ for 1.5-2.0 h to obtain the final product.

[0017] The beneficial effects of this invention are:

[0018] The anti-wear composite hydraulic oil prepared by this invention exhibits excellent antioxidant and stability properties, as well as excellent anti-wear properties, due to the synergistic effect of its components.

[0019] This invention modifies the composite particles of molybdenum disulfide and graphene by forming a composite with molybdenum disulfide and graphene, followed by chemical grafting with phenol derivatives, aniline derivatives, and magnolol. This process imparts antioxidant properties to the organic matter in molybdenum disulfide and graphene, allowing them to form a dense protective film through adsorption and coordination mechanisms. This improves the corrosion resistance of hydraulic oil while reducing friction and wear, further enhancing the anti-wear performance of the hydraulic oil. Detailed Implementation

[0020] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with embodiments, is provided below. Example 1

[0021] An anti-wear composite hydraulic oil comprises the following components by weight: 100 parts of 350N base oil, 6 parts of polymethyl methacrylate, 3 parts of modified molybdenum disulfide, and 0.08 parts of polyvinyl alcohol;

[0022] The method for preparing the modified molybdenum disulfide includes the following steps:

[0023] Step 1: Under a nitrogen atmosphere, molybdenum disulfide is placed in a microwave generator for high-temperature and pressure controlled treatment, and a mixed gas is introduced for vapor phase deposition to obtain composite particles; wherein, the high-temperature and pressure controlled treatment is carried out at 700℃ and 6.0kPa; the flow rate of the mixed gas is 0.26L / min; the ratio of molybdenum disulfide to mixed gas is 5g:28L; the mixed gas is composed of hydrogen and methane mixed at a volume ratio of 1.2:10.

[0024] Step 2: After mixing the composite particles and isopropanol, add the phenol derivative and stir at 32°C for 30 min. Add the auxiliaries and aniline derivative and stir at 75°C for 4 h. After cooling to room temperature, filter, wash three times with anhydrous ethanol, and vacuum dry at 80°C to constant weight to obtain the intermediate. The mass ratio of the composite particles, phenol derivative, auxiliaries, aniline derivative, and isopropanol is 12:2.4:0.2:2.2:40. The phenol derivative is 3-(4-hydroxyphenyl)propenal; the auxiliaries are acetic acid; and the aniline derivative is 3,4-dimercaptoaniline.

[0025] Step 3: The intermediate was placed in isopropanol and stirred at 300 r / min for 20 min. The temperature was then increased to 50 °C at a rate of 2 °C / min. Magnolol and the initiator were added and stirred at 60 °C for 8 h. After filtration, the mixture was washed three times with anhydrous ethanol and then vacuum dried in an oven at 80 °C until constant weight was obtained to obtain modified molybdenum disulfide. The mass ratio of the intermediate, isopropanol, magnolol, and initiator was 15:50:3.0:0.08. The initiator was AIBN.

[0026] A method for preparing an anti-wear composite hydraulic oil includes the following steps:

[0027] Modified molybdenum disulfide was added to the base oil and ultrasonically treated at 50°C for 45 min. Polymethyl methacrylate and polyvinyl alcohol were then added and stirred at 50°C for 1.5 h to obtain the final product. Example 2

[0028] An anti-wear composite hydraulic oil comprises the following components by weight: 102 parts of 350N base oil, 6.5 parts of polymethyl methacrylate, 3.2 parts of modified molybdenum disulfide, and 0.09 parts of polyvinyl alcohol;

[0029] The method for preparing the modified molybdenum disulfide includes the following steps:

[0030] Step 1: Under a nitrogen atmosphere, molybdenum disulfide is placed in a microwave generator for high-temperature and pressure controlled treatment, and a mixed gas is introduced for vapor phase deposition to obtain composite particles; wherein, the high-temperature and pressure controlled treatment is carried out at a temperature of 705℃ and a pressure of 6.0 kPa; the flow rate of the mixed gas is 0.27 L / min; the ratio of molybdenum disulfide to mixed gas is 5 g: 28.5 L; the mixed gas is composed of hydrogen and methane mixed at a volume ratio of 1.2:10.2.

[0031] Step 2: After mixing the composite particles and isopropanol, add the phenol derivative and stir at 34°C for 32 min. Add the auxiliaries and aniline derivative and stir at 76°C for 4.2 h. After cooling to room temperature, filter, wash three times with anhydrous ethanol, and vacuum dry at 80°C to constant weight to obtain the intermediate. The mass ratio of the composite particles, phenol derivative, auxiliaries, aniline derivative, and isopropanol is 12.5:2.6:0.22:2.3:42. The phenol derivative is 3-(4-hydroxyphenyl)propenal; the auxiliaries are acetic acid; and the aniline derivative is 3,4-dimercaptoaniline.

[0032] Step 3: The intermediate was placed in isopropanol and stirred at 320 r / min for 22 min. The temperature was then increased to 50 °C at a rate of 2.5 °C / min. Magnolol and the initiator were added and stirred at 62 °C for 8.5 h. After filtration, the mixture was washed three times with anhydrous ethanol and then vacuum dried in an oven at 80 °C until constant weight was obtained to obtain modified molybdenum disulfide. The mass ratio of the intermediate, isopropanol, magnolol, and initiator was 15.2:52:3.1:0.09. The initiator was AIBN.

[0033] A method for preparing an anti-wear composite hydraulic oil includes the following steps:

[0034] Modified molybdenum disulfide was added to the base oil and ultrasonically treated at 52°C for 49 min. Polymethyl methacrylate and polyvinyl alcohol were then added and stirred at 52°C for 1.6 h to obtain the final product. Example 3

[0035] An anti-wear composite hydraulic oil comprises the following components by weight: 105 parts of 350N base oil, 7 parts of polymethyl methacrylate, 3.5 parts of modified molybdenum disulfide, and 0.09 parts of polyvinyl alcohol;

[0036] The method for preparing the modified molybdenum disulfide includes the following steps:

[0037] Step 1: Under a nitrogen atmosphere, molybdenum disulfide is placed in a microwave generator for high-temperature and pressure controlled treatment, and a mixed gas is introduced for vapor phase deposition to obtain composite particles; wherein, the high-temperature and pressure controlled treatment is carried out at a temperature of 710℃ and a pressure of 6.0 kPa; the flow rate of the mixed gas is 0.28 L / min; the ratio of molybdenum disulfide to mixed gas is 5 g: 29 L; the mixed gas is composed of hydrogen and methane mixed at a volume ratio of 1.2: 10.5.

[0038] Step 2: After mixing the composite particles and isopropanol, add the phenol derivative and stir at 36°C for 35 min. Add the auxiliaries and aniline derivative and stir at 78°C for 4.5 h. After cooling to room temperature, filter, wash three times with anhydrous ethanol, and vacuum dry at 80°C to constant weight to obtain the intermediate. The mass ratio of the composite particles, phenol derivative, auxiliaries, aniline derivative, and isopropanol is 13:2.7:0.25:2.3:45. The phenol derivative is 3-(4-hydroxyphenyl)propenal; the auxiliaries are acetic acid; and the aniline derivative is 3,4-dimercaptoaniline.

[0039] Step 3: The intermediate was placed in isopropanol and stirred at 350 r / min for 25 min. The temperature was then increased to 50 °C at a rate of 2.5 °C / min. Magnolol and the initiator were added and stirred at 65 °C for 9 h. After filtration, the mixture was washed three times with anhydrous ethanol and then vacuum dried in an oven at 80 °C until constant weight was obtained to obtain modified molybdenum disulfide. The mass ratio of the intermediate, isopropanol, magnolol, and initiator was 15.5:55:3.2:0.09. The initiator was AIBN.

[0040] A method for preparing an anti-wear composite hydraulic oil includes the following steps:

[0041] Modified molybdenum disulfide was added to the base oil and ultrasonically treated at 55°C for 52 min. Polymethyl methacrylate and polyvinyl alcohol were then added and stirred at 55°C for 1.8 h to obtain the final product. Example 4

[0042] An anti-wear composite hydraulic oil comprises the following components by weight: 108 parts of 350N base oil, 7.5 parts of polymethyl methacrylate, 3.8 parts of modified molybdenum disulfide, and 0.09 parts of polyvinyl alcohol;

[0043] The method for preparing the modified molybdenum disulfide includes the following steps:

[0044] Step 1: Under a nitrogen atmosphere, molybdenum disulfide is placed in a microwave generator for high-temperature and pressure controlled treatment, and a mixed gas is introduced for vapor phase deposition to obtain composite particles; wherein, the high-temperature and pressure controlled treatment is carried out at a temperature of 715℃ and a pressure of 6.0 kPa; the flow rate of the mixed gas is 0.29 L / min; the ratio of molybdenum disulfide to mixed gas is 5 g: 29.5 L; the mixed gas is composed of hydrogen and methane mixed at a volume ratio of 1.2: 10.8.

[0045] Step 2: After mixing the composite particles and isopropanol, add the phenol derivative and stir at 38°C for 38 min. Add the auxiliaries and aniline derivative and stir at 79°C for 4.8 h. After cooling to room temperature, filter, wash three times with anhydrous ethanol, and vacuum dry at 80°C to constant weight to obtain the intermediate. The mass ratio of the composite particles, phenol derivative, auxiliaries, aniline derivative, and isopropanol is 13.5:2.8:0.28:2.3:48. The phenol derivative is 3-(4-hydroxyphenyl)propenal; the auxiliaries are acetic acid; and the aniline derivative is 3,4-dimercaptoaniline.

[0046] Step 3: The intermediate was placed in isopropanol and stirred at 370 r / min for 28 min. The temperature was then increased to 50 °C at a rate of 2.5 °C / min. Magnolol and the initiator were added and stirred at 68 °C for 9.5 h. After filtration, the mixture was washed three times with anhydrous ethanol and then vacuum dried in an oven at 80 °C until constant weight was obtained to obtain modified molybdenum disulfide. The mass ratio of the intermediate, isopropanol, magnolol, and initiator was 15.8:58:3.3:0.09. The initiator was AIBN.

[0047] A method for preparing an anti-wear composite hydraulic oil includes the following steps:

[0048] Modified molybdenum disulfide was added to the base oil and ultrasonically treated at 58°C for 56 min. Polymethyl methacrylate and polyvinyl alcohol were then added and stirred at 58°C for 1.9 h to obtain the final product. Example 5

[0049] An anti-wear composite hydraulic oil comprises the following components by weight: 110 parts of 350N base oil, 8 parts of polymethyl methacrylate, 4 parts of modified molybdenum disulfide, and 0.10 parts of polyvinyl alcohol;

[0050] The method for preparing the modified molybdenum disulfide includes the following steps:

[0051] Step 1: Under a nitrogen atmosphere, molybdenum disulfide is placed in a microwave generator for high-temperature and pressure controlled treatment, and a mixed gas is introduced for vapor phase deposition to obtain composite particles; wherein, the high-temperature and pressure controlled treatment is carried out at 720℃ and 6.0kPa; the flow rate of the mixed gas is 0.30L / min; the ratio of molybdenum disulfide to mixed gas is 5g:30L; the mixed gas is composed of hydrogen and methane mixed at a volume ratio of 1.2:11.

[0052] Step 2: After mixing the composite particles and isopropanol, add the phenol derivative and stir at 40°C for 40 min. Add the auxiliaries and aniline derivative and stir at 80°C for 5 h. After cooling to room temperature, filter and wash three times with anhydrous ethanol. Dry under vacuum at 80°C to constant weight to obtain the intermediate. The mass ratio of the composite particles, phenol derivative, auxiliaries, aniline derivative and isopropanol is 14:3.0:0.3:2.4:50. The phenol derivative is 3-(4-hydroxyphenyl)propenal; the auxiliaries are acetic acid; and the aniline derivative is 3,4-dimercaptoaniline.

[0053] Step 3: The intermediate was placed in isopropanol and stirred at 400 r / min for 30 min. The temperature was then increased to 50°C at a rate of 3°C / min. Magnolol and the initiator were added and stirred at 70°C for 10 h. After filtration, the mixture was washed three times with anhydrous ethanol and then vacuum dried in an oven at 80°C until constant weight was obtained to obtain modified molybdenum disulfide. The mass ratio of the intermediate, isopropanol, magnolol, and initiator was 16:60:3.4:0.10. The initiator was AIBN.

[0054] A method for preparing an anti-wear composite hydraulic oil includes the following steps:

[0055] Modified molybdenum disulfide was added to the base oil and ultrasonically treated at 60°C for 60 min. Polymethyl methacrylate and polyvinyl alcohol were then added and stirred at 60°C for 2.0 h to obtain the final product.

[0056] Comparative Example 1

[0057] Compared with Example 4, Comparative Example 1 differs in that step one is omitted and molybdenum disulfide is used instead of composite particles, while the remaining components, preparation steps and parameters are the same.

[0058] Comparative Example 2

[0059] Compared with Example 4, Comparative Example 2 differs in that phenyl acrolein is used instead of phenol derivatives, while the other components, preparation steps and parameters are the same.

[0060] Comparative Example 3

[0061] Compared with Example 4, Comparative Example 3 differs in that it does not use phenol derivatives, while the remaining components, preparation steps and parameters are the same.

[0062] Comparative Example 4

[0063] Compared with Example 4, Comparative Example 4 differs in that aniline is used instead of aniline derivatives, while the other components, preparation steps and parameters are the same.

[0064] Comparative Example 5

[0065] Compared with Example 4, Comparative Example 5 differs in that it does not use magnolol, while the other components, preparation steps and parameters are the same.

[0066] The hydraulic oils prepared in Examples 1-5 and Comparative Examples 1-5 were tested for the following properties, and the test results are shown in Table 1.

[0067] Copper strip corrosion test: According to GB / T 5096-2017, the test temperature is 120℃ and the test time is 3h;

[0068] Wear resistance test: according to NB / SH / T 0189-2017; parameters: 75℃ temperature, 1200r / min rotation speed, 1h time, 300N load;

[0069] Table 1

[0070] Copper sheet corrosion (grade) Wear scar 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

[0071] As can be seen from the test results in Table 1, compared with Comparative Examples 1-5, the present invention has good anti-corrosion performance by adding modified molybdenum disulfide to hydraulic oil, and at the same time reduces the wear scar diameter of hydraulic oil, thus having better anti-wear properties.

[0072] Comparative analysis reveals that this invention improves the dispersibility of molybdenum disulfide in hydraulic oil by generating graphene on the surface of molybdenum disulfide through vapor deposition, preventing its agglomeration. The composite of the two forms a denser and more uniform two-dimensional protective layer, effectively isolating corrosive substances, reducing metal surface corrosion, and better exerting its lubrication and corrosion prevention functions. This invention modifies the composite particles of molybdenum disulfide and graphene by sequentially forming chemical grafts with phenol derivatives, aniline derivatives, and magnolol. The introduced catechol structure, imine group, biphenyl structure, and sulfur-containing group can work together through multiple mechanisms such as adsorption and coordination with active sites on the metal surface via phenolic hydroxyl groups and thiol groups to form a dense protective film, improving corrosion resistance while reducing friction and wear, further enhancing anti-wear performance. In addition, the modification of the composite particles effectively improves the dispersibility of molybdenum disulfide and graphene in the hydraulic oil system, allowing their anti-wear properties to be better exerted.

[0073] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any indirect modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. An anti-wear composite hydraulic oil, characterized in that: The composition is composed of 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; the base oil is 350N base oil; the other additives are 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; the amount ratio of the molybdenum disulfide and the mixed gas is 5g:28-30L; the mixed gas is a mixture of hydrogen and methane in a volume ratio of 1.2:10-11; the flow rate of the mixed gas is 0.26-0.30L / min; the high-temperature controlled pressure treatment is carried out at a temperature of 700-720°C and a pressure of 6.0kPa; 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: 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.

3. 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.

4. 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.

5. 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.

6. A method for preparing the anti-wear composite hydraulic oil according to any one of claims 1 to 5, 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.