An anti-wear corrosion-resistant lubricating oil and a method for preparing the same

Abstract

The application provides an anti-wear and corrosion-resistant lubricating oil and a preparation method thereof, which is prepared from the following raw materials in parts by weight: base oil 88-92 parts, phosphate ester and phosphoric amine co-grafted graphene oxide 3-6 parts, cleaning dispersant 0.5-1 part, antioxidant 2-4 parts, defoaming agent 0.5-1 part and pour point depressant 0.5-1 part. Through co-grafting of phosphate ester and phosphoric amine on graphene oxide, the synergistic effect of phosphate ester groups and phosphoric amine groups and the 'nanometer bearing' effect of graphene oxide are utilized to improve the anti-wear property and corrosion resistance of the lubricating oil. Meanwhile, the ability of the phosphoric amine groups to neutralize acidic substances and the chelation effect of the phosphate ester groups are utilized, and the high specific surface area and barrier property of graphene oxide are combined to further enhance the corrosion resistance and oxidation resistance. Through the multifunctional synergistic effect, the application solves the problem of single function of traditional additives, and significantly prolongs the service life of the lubricating oil under high temperature, high load and extreme environment.

Description

Technical Field

[0001] This invention relates to the field of lubricating oils, and more specifically to an anti-wear and corrosion-resistant lubricating oil and its preparation method. Background Technology

[0002] Existing technologies primarily address four methods for reducing friction: reducing pressure between objects, reducing roughness between two objects, replacing sliding friction with rolling friction, and adding lubricants. Common lubricants include greases, lubricating oils, and solid lubricants. Among these, lubricating oils are widely used due to their high cost-effectiveness.

[0003] Lubricating oil is mainly composed of base oil and additives. Base oil is the main component of lubricating oil and determines its basic properties. Additives are generally used to improve certain performance defects of the base oil, and mainly include extreme pressure agents, anti-wear agents, antioxidants, and rust inhibitors, which can respectively improve the extreme pressure, anti-wear, anti-oxidation, and rust prevention properties of lubricating oil.

[0004] Traditional lubricating oils typically achieve a single function by adding anti-wear agents (such as ZDDP) or corrosion inhibitors (such as amine compounds), but these two types of additives are prone to performance conflicts. For example, anti-wear agents may accelerate metal corrosion, while corrosion inhibitors may reduce lubrication performance. In addition, existing composite additive systems suffer from poor compatibility and insufficient high-temperature stability, leading to a decline in lubricating oil performance under complex operating conditions.

[0005] Graphene oxide (GO) is an ideal matrix for lubricant additives due to its high specific surface area and excellent mechanical properties. Patent CN1175887499A discloses a high-temperature resistant, environmentally friendly lubricating oil and its preparation method, comprising the following components by mass percentage: 90-98% base oil, 0.01-0.05% graphene composite, and 1.99-9.95% auxiliary additives; wherein the graphene composite is a composite of modified sheet graphene and modified graphene microspheres, with a mass ratio of modified sheet graphene to modified graphene microspheres of 2:1-3:1. The modified graphene microspheres are long-chain alkyl acid-modified graphene microspheres, and the long-chain alkyl acid is oleic acid and / or stearic acid. This graphene composite mainly improves wear resistance, but the overall improvement in wear resistance is not significant. Generally, lubricating oils with anti-wear properties should have a wear scar diameter of ≤0.4 mm. This graphene composite has failed to achieve this goal, and due to the presence of long-chain alkyl acids, it will cause iron corrosion to some extent.

[0006] Patent CN117511639A discloses a composite lubricating oil comprising the following raw materials in parts by weight: 80-90 parts base oil, 1-3 parts rust inhibitor, 1-5 parts extreme pressure anti-wear agent, 1-3 parts antioxidant, 0.5-1.5 parts viscosity index improver, 1-5 parts detergent dispersant, 0.1-0.5 parts defoamer, and 1-2 parts naphthyl-containing methylimidazolium chloride. The preparation steps of the rust inhibitor are as follows: graphene oxide, hydrochloric acid, and 1-aminonaphthalene-4-sulfonic acid are mixed, stirred evenly, and reacted at 280-300℃ for 3-5 hours. Then, dimethylformamide is added to the reaction system, refluxed for 2-3 hours, and the pH is adjusted to 6.9-7.1 using sodium hydroxide solution. The mixture is then filtered, washed, and dried to obtain the rust inhibitor. The graphene composite in this patent is used as a rust inhibitor, but in order to achieve wear resistance and corrosion resistance, an extreme pressure anti-wear agent is still added. Summary of the Invention

[0007] This invention aims to provide an anti-wear and corrosion-resistant lubricating oil and its preparation method, with the goal of developing a lubricating oil that can provide both good anti-wear effect and effective corrosion resistance.

[0008] To achieve the technical objective of this invention, the following technical solution is adopted: an anti-wear and corrosion-resistant lubricating oil, composed of the following components: 88-92 parts base oil, 3-6 parts graphene oxide co-grafted with phosphate ester and phosphate amine, 0.5-1 parts detergent dispersant, 2-4 parts antioxidant, 0.5-1 parts defoamer, and 0.5-1 parts pour point depressant.

[0009] The preparation method of phosphate ester and phosphate amine grafted graphene oxide is as follows: (1) Graphene oxide (GO) is dispersed in deionized water and ultrasonically treated for 1-3 hours to obtain a uniform dispersion with a concentration of 1-10 mg / mL; sodium hydroxide is added to adjust the pH of the solution to 8-10.

[0010] (2) The phosphate esterification reagent and the imidazole ionic liquid catalyst are mixed at a mass ratio of 1:0.01-0.1; the mixed reagent is added dropwise to the graphene oxide dispersion, heated to 60-90℃ under nitrogen protection, and reacted for 6-24 hours; unreacted reagents are removed by centrifugation or dialysis to obtain phosphate ester-grafted graphene oxide (P-GO).

[0011] (3) Mix the phosphorylation reagent with triethylamine at a mass ratio of 1:0.05-0.2; add the mixed reagent to the P-GO dispersion and heat to 70-90℃ under nitrogen protection for 6-12 hours; remove unreacted reagent by centrifugation or dialysis, wash with anhydrous ethanol and deionized water 2-5 times respectively, and dry in a vacuum desiccator at 25-40℃ for 24-72 hours; obtain phosphate ester and phosphate ammonium co-grafted graphene oxide (PAP-GO).

[0012] Furthermore, the phosphoric acid esterification agent is one or more of isooctyl phosphate, isononyl phosphate, isodecanyl phosphate, and dodecyl phosphate; the phosphoric acid amination agent is one or more of decylamine phosphate, dodecylamine phosphate, tetradecylamine phosphate, octadecylamine phosphate, and eicosamine phosphate; the mass ratio of the phosphoric acid esterification agent to graphene oxide is (8-12):1; the mass ratio of the phosphoric acid amination agent to graphene oxide is (8-12):1; the imidazole ionic liquid catalyst is one or more of 1-butyl-3-methylimidazolium tetrafluoroborate, 1-ethyl-3-methylimidazolium tetrafluoroborate, and 1-butyl-3-methylimidazolium hexafluorophosphate.

[0013] Furthermore, the graphene oxide has 1-10 layers, a sheet thickness of 0.8-1.2 nm, and a particle size of 1-10 μm.

[0014] Preferably, the base oil is at least one of Group III hydrotreated base oil and polyalphaolefin (PAO).

[0015] Preferably, the cleaning and dispersing agent is one or more of polyisobutylene bis(succinimide), diene succinimide, and boronized polyisobutylene succinimide.

[0016] Preferably, the antioxidant is a combination of aromatic amine antioxidant and hindered phenolic antioxidant, wherein 1-2 parts are aromatic amine antioxidant and 1-2 parts are hindered phenolic antioxidant.

[0017] Furthermore, the aromatic amine antioxidants are one or more of octyl diphenylamine, butyl diphenylamine, monononyl diphenylamine, α-naphthylamine, phenyl-α-naphthylamine, and butylphenyl-α-naphthylamine. The hindered phenols are 2,6-di-tert-butyl-4-methylphenol or 2,6-di-tert-butylphenol.

[0018] Preferably, the defoamer is one of polydimethylsiloxane defoamer or fluorinated polysiloxane defoamer.

[0019] Preferably, the pour point depressant is one or more of polymethacrylate, ethylene-vinyl acetate copolymer, and styrene-fumarate copolymer.

[0020] Furthermore, the present invention also provides a method for preparing an anti-wear and corrosion-resistant lubricating oil, comprising the following steps:

[0021] (1) Heat the base oil to 40-60℃, then add the detergent dispersant and antioxidant while stirring, and stir at 200-500 rpm for 20-40 min to obtain a mixture;

[0022] (2) Heat the mixture obtained in step (1) to 100-110℃, stir for 1-2 hours, cool down to 40-50℃, and then add phosphate ester and phosphate amine grafted graphene oxide, pour point depressant and defoamer while stirring in proportion, and continue stirring for 1-2 hours to obtain anti-wear and corrosion resistant lubricating oil.

[0023] In this invention, the phosphate ester groups in PAP-GO react chemically with the metal surface during friction to form a phosphate protective film. Simultaneously, the phosphate amine groups adsorb onto the metal surface to form a dense organic film, further reducing the coefficient of friction. This dual-film structure enhances the durability and strength of the protective film. The sheet structure of graphene oxide slips during friction, creating a "nano-bearing" effect that reduces direct metal contact. The two-dimensional structure of PAP-GO effectively fills surface microcracks and repairs worn areas. Therefore, the synergistic effect of the phosphate ester and phosphate amine groups, along with the unique structure of graphene oxide, further enhances the anti-wear performance.

[0024] Because the phosphate amine groups in PAP-GO are alkaline, they can neutralize acidic substances generated by lubricating oil during use, preventing corrosion of metal surfaces. Simultaneously, the phosphate ester groups have a chelating effect, adsorbing metal ions and inhibiting electrochemical corrosion. Furthermore, the phosphate ester and phosphate amine groups in PAP-GO react with the metal surface to form a stable passivation film, effectively preventing the penetration of moisture, oxygen, and corrosive media, further enhancing the anti-corrosion effect.

[0025] The phosphate ester and phosphate amine groups in PAP-GO can capture free radicals generated during lubricant oxidation, interrupting the chain reaction; the high specific surface area of ​​graphene oxide provides more active sites, enhancing the antioxidant effect. The phosphate ester groups possess flame-retardant, anti-wear, and metal-chelating properties, while the phosphate amine groups exhibit excellent anti-wear and extreme pressure properties. Grafting both onto the surface of graphene oxide imparts synergistic properties to the material.

[0026] Compared with the prior art, the present invention has the following technical advantages: PAP-GO has anti-wear, anti-corrosion and anti-oxidation properties at the same time, which solves the problem of single function of traditional additives; PAP-GO can maintain stable performance under high temperature, high load and extreme environment, which extends the service life of lubricating oil; and further improves the overall performance of lubricating oil.

[0027] Meanwhile, this invention utilizes the different mechanisms by which hindered phenolic antioxidants and aromatic amine antioxidants inhibit oxidation reactions, and combines the synergistic effect of PAP-GO and composite antioxidants to significantly extend the service life of lubricating oil. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention are further described below through specific embodiments. Those skilled in the art should understand that the embodiments described are merely for the purpose of helping to understand the technical content and effects of this invention and should not be considered as limitations on this invention.

[0029] The graphene oxide used in the manufacturing examples and embodiments of the present invention was purchased from Shandong Jinlite New Materials Co., Ltd.

[0030] Manufacturing Example 1: Co-grafting of graphene oxide with phosphate ester and phosphate amine (PAP-GO-1)

[0031] (1) Graphene oxide was dispersed in deionized water and sonicated for 2 hours to obtain a uniform dispersion with a concentration of 2 mg / mL; sodium hydroxide solution was added to adjust the pH of the solution to 9.

[0032] (2) Isononyl phosphate and 1-butyl-3-methylimidazolium tetrafluoroborate were mixed at a mass ratio of 1:0.01; the mixed reagent was added dropwise to the graphene oxide dispersion (the mass ratio of isononyl phosphate to graphene oxide was 10:1), and heated to 70°C under nitrogen protection for 12 hours; unreacted reagents were removed by centrifugation or dialysis to obtain phosphate-grafted graphene oxide (P-GO-1).

[0033] (3) Mix dodecylamine phosphate and triethylamine at a mass ratio of 1:0.05; add the mixed reagent to the P-GO dispersion (the mass ratio of dodecylamine phosphate to graphene oxide is 10:1), heat to 70°C under nitrogen protection, and react for 12 hours; remove unreacted reagent by centrifugation or dialysis, wash three times with anhydrous ethanol and deionized water respectively, and dry in a vacuum desiccator at 40°C for 48 hours; obtain graphene oxide co-grafted with phosphate ester and phosphate amine (PAP-GO-1).

[0034] Manufacturing Example 2: Co-grafting of graphene oxide with phosphate ester and phosphate ammonium (PAP-GO-2)

[0035] (1) Graphene oxide was dispersed in deionized water and sonicated for 2 hours to obtain a uniform dispersion with a concentration of 4 mg / mL; sodium hydroxide solution was added to adjust the pH of the solution to 9.

[0036] (2) Mix isodecyl phosphate and 1-ethyl-3-methylimidazolium tetrafluoroborate at a mass ratio of 1:0.01; add the mixed reagent dropwise to the graphene oxide dispersion (the mass ratio of isodecyl phosphate to graphene oxide is 12:1), heat to 70°C under nitrogen protection, and react for 12 hours; remove unreacted reagent by centrifugation or dialysis to obtain phosphate-grafted graphene oxide (P-GO-2).

[0037] (3) Mix dodecylamine phosphate and triethylamine at a mass ratio of 1:0.05; add the mixed reagent to the P-GO dispersion (the mass ratio of dodecylamine phosphate to graphene oxide is 12:1), heat to 70°C under nitrogen protection, and react for 12 hours; remove unreacted reagent by centrifugation or dialysis, wash three times with anhydrous ethanol and deionized water respectively, and dry in a vacuum desiccator at 40°C for 48 hours; obtain graphene oxide co-grafted with phosphate ester and phosphate amine (PAP-GO-2).

[0038] Manufacturing Example 3: Phosphate Grafted Graphene Oxide (P-GO-3)

[0039] (1) Graphene oxide was dispersed in deionized water and sonicated for 2 hours to obtain a uniform dispersion with a concentration of 2 mg / mL; sodium hydroxide solution was added to adjust the pH of the solution to 9.

[0040] (2) Isononyl phosphate and 1-butyl-3-methylimidazolium tetrafluoroborate were mixed at a mass ratio of 1:0.01. The mixed reagent was added dropwise to the graphene oxide dispersion (the mass ratio of isononyl phosphate to graphene oxide was 20:1). The mixture was heated to 70°C under nitrogen protection and reacted for 12 hours. Unreacted reagents were removed by centrifugation or dialysis. The mixture was washed three times by centrifugation with anhydrous ethanol and deionized water, respectively, and dried in a vacuum desiccator at 40°C for 48 hours to obtain phosphate-grafted graphene oxide (P-GO-3).

[0041] Manufacturing Example 4: Ammonium phosphate grafted graphene oxide (AP-GO-4)

[0042] (1) Graphene oxide was dispersed in deionized water and sonicated for 2 hours to obtain a uniform dispersion with a concentration of 2 mg / mL; sodium hydroxide solution was added to adjust the pH of the solution to 9.

[0043] (2) Mix dodecylamine phosphate and triethylamine at a mass ratio of 1:0.05; add the mixed reagent to the graphene oxide dispersion (the mass ratio of dodecylamine phosphate to graphene oxide is 20:1), heat to 70°C under nitrogen protection, and react for 12 hours; remove unreacted reagents by centrifugation or dialysis, wash three times with anhydrous ethanol and deionized water respectively, and dry in a vacuum desiccator at 40°C for 48 hours; obtain ammonium phosphate grafted graphene oxide (AP-GO-4).

[0044] This invention comprises three embodiments and three comparative examples.

[0045] Example 1:

[0046] (1) Heat 900g PAO4 to 60℃, then add 10g polyisobutylene bis(succinimide), 10g octyl diphenylamine and 10g 2,6-di-tert-butylphenol while stirring. Stir at 300rpm for 30min to obtain a mixture.

[0047] (2) Heat the mixture obtained in step (1) to 100°C, stir for 1.5 h, cool down to 40°C, and then add 60 g PAP-GO-1 (manufacturing example 1), 5 g polydimethylsiloxane defoamer and 5 g polymethyl methacrylate while stirring according to the proportion, and continue stirring for 2 h to obtain composite lubricating oil.

[0048] Example 2:

[0049] (1) Heat 900g PAO6 to 60℃, then add 10g diene succinimide, 10g butyl diphenylamine and 10g 2,6-di-tert-butyl-4-methylphenol while stirring. Stir at 400rpm for 30min to obtain a mixture.

[0050] (2) Heat the mixture obtained in step (1) to 110°C, stir for 2 hours, cool down to 50°C, and then add 40g PAP-GO-2 (manufacturing example 2), 5g polydimethylsiloxane defoamer, and 5g ethylene-vinyl acetate copolymer while stirring in proportion. Continue stirring for 1.5 hours to obtain composite lubricating oil.

[0051] Example 3:

[0052] (1) Heat 900g PAO4 to 50℃, then add 8g polyisobutylene bis(succinimide), 15g octyl diphenylamine and 15g 2,6-di-tert-butylphenol while stirring. Stir at 300rpm for 30min to obtain a mixture.

[0053] (2) Heat the mixture obtained in step (1) to 100°C, stir for 2 hours, cool down to 40°C, and then add 50g PAP-GO-1 (manufacturing example 1), 5g polydimethylsiloxane defoamer and 5g polymethyl methacrylate while stirring according to the proportion, and continue stirring for 2 hours to obtain composite lubricating oil.

[0054] Comparative Example 1:

[0055] The only difference from Example 1 is that 60g of P-GO-3 (Manufacturing Example 3) is used instead of PAP-GO-1.

[0056] Comparative Example 2:

[0057] The only difference from Example 2 is that 40g AP-GO-4 (Manufacturing Example 4) is used instead of PAP-GO-2.

[0058] Comparative Example 3:

[0059] The only difference from Example 3 is that 25g of isononyl phosphate and 25g of dodecylamine phosphate are used instead of PAP-GO-1.

[0060] The lubricating oils obtained in Examples 1-3 and Comparative Examples 1-3 of this invention were subjected to the following tests, and the results are shown in Table 1:

[0061] Wear resistance test: According to GB / T 12583-2018, the top ball of a four-ball machine was used to rotate three steel balls under a fixed pressure of 392 N at a speed of 1200 r / min. The test temperature was 75 ℃, and each test lasted for 60 min. The measured wear scar diameter was used as the basis for wear resistance.

[0062] Corrosion resistance test: According to ASTM D130, the cleaned copper sheet is vertically immersed in the lubricating oil in the test tube; ensure that the copper sheet is completely submerged, place the test tube in a constant temperature bath, and heat at 100°C for 3 hours. After heating, remove the copper sheet, clean it, and compare it with the corrosion standard color chart, recording the color change of the copper sheet; evaluate the corrosion level (1a-4c) based on the color change; the copper sheet should be electrolytic copper with a purity of 99.9% or higher, with a size of 75 mm * 12.5 mm * 1.5 mm.

[0063] Oxidation stability test: Following ASTM D943, 300 mL of lubricating oil sample was poured into an oxidation tube; 60 mL of deionized water was added; a cleaned copper sheet was immersed in the lubricating oil sample; the oxidation tube was placed in a constant temperature bath and heated to 95°C; oxygen was introduced at a flow rate of 3 L / h; 1 g of lubricating oil sample was removed from the oxidation tube every 24 hours; the acid value of the lubricating oil was measured using a potentiometric titrator or manual titration; the change in acid value over time was recorded. Electrolytic copper with a purity of 99.9% or higher and dimensions of 75 mm * 12.5 mm * 1.5 mm was selected. The test was terminated when the acid value of the lubricating oil reached 2.0 mg KOH / g; the time from the start to the acid value reaching 2.0 mg KOH / g (oxidation induction period) was used as the basis for oxidation stability. The longer the time, the better the oxidation stability.

[0064] Table 1: Results of wear resistance, corrosion resistance and oxidation stability of the examples and comparative examples

[0065]

[0066] The results from Example 1 and Comparative Example 1 show that the phosphate amine groups can form a dense organic film on the metal surface through adsorption, significantly reducing the coefficient of friction and neutralizing acidic substances in the lubricating oil, thus inhibiting metal corrosion. Furthermore, the phosphate amine groups can capture free radicals, delaying the oxidation process of the lubricating oil. Therefore, P-GO-3 lacking phosphate amine groups cannot fully utilize these functions, resulting in a decrease in the anti-wear, anti-corrosion, and anti-oxidation properties of the lubricating oil.

[0067] The results from Example 2 and Comparative Example 2 show that the phosphate ester groups can chemically react with the metal surface during friction to form a phosphate protective film, effectively reducing direct metal contact and thus improving anti-wear performance. Simultaneously, the phosphate ester groups adsorb metal ions through chelation, inhibiting electrochemical corrosion. Furthermore, the phosphate ester groups can synergistically work with the phosphate amine groups to enhance the antioxidant properties of the lubricating oil. Therefore, AP-GO-4 lacking phosphate ester groups cannot form a complete protective film, leading to a decline in lubricating oil performance.

[0068] The results from Example 3 and Comparative Example 3 show that the two-dimensional structure of graphene oxide can act as a highly efficient carrier, uniformly dispersing phosphate ester and amine phosphate groups, and exerting a "nano-bearing" effect during friction, further reducing the coefficient of friction. Simultaneously, the high specific surface area of ​​graphene oxide provides more active sites, enhancing the antioxidant effect. In the comparative example, because phosphate esters and amine phosphates were directly added, lacking the carrier effect of graphene oxide, the additives easily agglomerated and could not be uniformly distributed in the lubricating oil, resulting in a significant decrease in anti-wear and antioxidant properties.

[0069] It should be noted that this application is not limited to the above-described embodiments. The above embodiments are merely examples, and any embodiments with the same structure and effect as the technical concept within the scope of this application are included in the technical scope of this application. Furthermore, various modifications that can be conceived by those skilled in the art to the embodiments, and other ways of constructing by combining some of the constituent elements of the embodiments, without departing from the spirit of this application, are also included in the scope of this application.

Claims

1. An anti-wear and corrosion-resistant lubricating oil, characterized in that, It is composed of the following components: 88-92 parts base oil, 3-6 parts graphene oxide grafted with phosphate ester and phosphate amine, 0.5-1 parts detergent dispersant, 2-4 parts antioxidant, 0.5-1 parts defoamer, and 0.5-1 parts pour point depressant. The preparation method of graphene oxide grafted with phosphate ester and phosphate amine is as follows: (1) Disperse graphene oxide in deionized water and sonicate for 1-3 hours to obtain a uniform dispersion with a concentration of 1-10 mg / mL; add sodium hydroxide to adjust the pH of the solution to 8-10. (2) The phosphate esterification reagent and the imidazole ionic liquid catalyst are mixed at a mass ratio of 1:0.01-0.1; the mixed reagent is added dropwise to the graphene oxide dispersion, heated to 60-90℃ under nitrogen protection, and reacted for 6-24 hours; the unreacted reagent is removed by centrifugation or dialysis to obtain phosphate ester-grafted graphene oxide P-GO. (3) Mix the phosphorylation reagent with triethylamine at a mass ratio of 1:0.05-0.2; add the mixed reagent to the P-GO dispersion, heat to 70-90℃ under nitrogen protection, and react for 6-12 hours; remove unreacted reagent by centrifugation or dialysis, wash with anhydrous ethanol and deionized water 2-5 times respectively, and dry in a vacuum desiccator at 25-40℃ for 24-72 hours; obtain graphene oxide co-grafted with phosphate ester and phosphate amine. The phosphorylation reagent is one or more of isooctyl phosphate, isononyl phosphate, isodecanyl phosphate, and dodecyl phosphate; the phosphorylation amination reagent is one or more of decylamine phosphate, dodecylamine phosphate, tetradecylamine phosphate, octadecylamine phosphate, and eicosamine phosphate; the mass ratio of the phosphorylation reagent to graphene oxide is (8-12):1; the mass ratio of the phosphorylation reagent to graphene oxide is (8-12):

1.

2. The anti-wear and corrosion-resistant lubricating oil according to claim 1, characterized in that, The imidazole ionic liquid catalyst is selected from one or more of 1-butyl-3-methylimidazolium tetrafluoroborate, 1-ethyl-3-methylimidazolium tetrafluoroborate, and 1-butyl-3-methylimidazolium hexafluorophosphate.

3. The anti-wear and corrosion-resistant lubricating oil according to claim 1, characterized in that, The graphene oxide has 1-10 layers, a sheet thickness of 0.8-1.2 nm, and a particle size of 1-10 μm.

4. The anti-wear and corrosion-resistant lubricating oil according to claim 1, characterized in that, The base oil is at least one of Group III hydrotreated base oil and polyalphaolefin (PAO).

5. The anti-wear and corrosion-resistant lubricating oil according to claim 1, characterized in that, The detergent dispersant is one or more of polyisobutylene bis(succinimide), diene succinimide, and boronized polyisobutylene succinimide; the defoamer is one of polydimethylsiloxane defoamer and fluorinated polysiloxane defoamer; and the pour point depressant is one or more of polymethyl methacrylate, ethylene-vinyl acetate copolymer, and styrene-fumarate copolymer.

6. The anti-wear and corrosion-resistant lubricating oil according to claim 1, characterized in that, The antioxidant is a blend of aromatic amine antioxidants and hindered phenolic antioxidants, with 1-2 parts of aromatic amine antioxidants and 1-2 parts of hindered phenolic antioxidants.

7. The anti-wear and corrosion-resistant lubricating oil according to claim 6, characterized in that, Aromatic amine antioxidants are one or more of octyl diphenylamine, butyl diphenylamine, monononyl diphenylamine, α-naphthylamine, phenyl-α-naphthylamine, and butylphenyl-α-naphthylamine; hindered phenolic antioxidants are 2,6-di-tert-butyl-4-methylphenol or 2,6-di-tert-butylphenol.

8. A method for preparing an anti-wear and corrosion-resistant lubricating oil according to any one of claims 1-7, characterized in that... Includes the following steps: (1) Heat the base oil to 40-60℃, then add the detergent dispersant and antioxidant while stirring, and stir at 200-500 rpm for 20-40 min to obtain a mixture; (2) Heat the mixture obtained in step (1) to 100-110℃, stir for 1-2 hours, cool down to 40-50℃, and then add phosphate ester and phosphate amine grafted graphene oxide, pour point depressant and defoamer while stirring in proportion, and continue stirring for 1-2 hours to obtain anti-wear and corrosion resistant lubricating oil.

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