Wear-resistant and corrosion-resistant lubricating oil and preparation method thereof

Abstract

The invention provides wear-resistant and corrosion-resistant lubricating oil and a preparation method thereof. The wear-resistant and corrosion-resistant lubricating oil is prepared from the following raw materials in parts by weight: 88-92 parts of base oil, 3-6 parts of phosphate and ammonium phosphate co-grafted graphene oxide, 0.5-1 part of a purification dispersant, 0.5-1 part of an antirust agent, 2-4 parts of an antioxidant, 0.5-1 part of a defoaming agent and 0.5-1 part of a pour point depressant. The phosphate and the ammonium phosphate are jointly grafted with the graphene oxide, and the wear resistance and the corrosion resistance of the lubricating oil are synergistically improved by utilizing the'nano bearing 'effect of a phosphate group, an ammonium phosphate group and the graphene oxide; meanwhile, by utilizing the capacity of ammonium phosphate groups for neutralizing acidic substances and the chelation of phosphate groups and combining the high specific surface area and barrier property of the graphene oxide, the anti-corrosion and anti-oxidation effects are further enhanced. Through a multifunctional synergistic effect, the problem that a traditional additive is single in function is solved, and the service life of the lubricating oil in high-temperature, high-load and extreme environments is remarkably prolonged.

Description

Technical Field:

[0001] The present invention relates to the field of lubricating oils, and more specifically to an anti-wear and corrosion-resistant lubricating oil and a preparation method thereof. Background Art:

[0002] There are mainly four ways in the prior art to reduce friction: reducing the pressure between objects, reducing the roughness between two objects, replacing sliding friction with rolling friction, and adding lubricants. Common lubricants mainly include grease, lubricating oil, and solid lubricants, etc. Among them, lubricating oil is widely used due to its relatively high economy.

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

[0004] Traditional lubricating oils usually achieve single functions by adding anti-wear agents (such as ZDDP) or anti-corrosion agents (such as amine compounds), but these two types of additives are prone to performance conflicts. For example, the anti-wear agent may accelerate metal corrosion, while the anti-corrosion agent may reduce the lubrication performance. In addition, there are problems such as poor compatibility and insufficient high-temperature stability in the composite additive system in the prior art, resulting in a decline in the performance of lubricating oil under complex working conditions.

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

[0006] Patent CN117511639A discloses a composite lubricating oil, which comprises the following raw materials in parts by weight: 80-90 parts of base oil, 1-3 parts of rust inhibitor, 1-5 parts of extreme pressure and anti-wear agent, 1-3 parts of antioxidant, 0.5-1.5 parts of viscosity index improver, 1-5 parts of detergent-dispersant, 0.1-0.5 parts of defoamer, and 1-2 parts of naphthalene-based methylimidazole chloride; The preparation steps of the rust inhibitor are as follows: Mix graphene oxide, hydrochloric acid, and 1-amino-naphthalene-4-sulfonic acid, stir evenly, react at 280-300 °C for 3-5 h, then add dimethylformamide to the reaction system, reflux for 2-3 h, and then adjust the pH to 6.9-7.1 with sodium hydroxide solution, filter, wash, and dry to obtain the rust inhibitor; The graphene composite of this patent is used as a rust inhibitor. In order to achieve the effect of wear resistance and corrosion prevention, it still needs to add an extreme pressure and anti-wear agent. Summary of the Invention:

[0007] The present invention aims to provide an anti-wear and corrosion-resistant lubricating oil and its preparation method, aiming to develop a lubricating oil that can not only achieve good anti-wear effect but also effectively resist corrosion.

[0008] To achieve the technical objectives of the present invention, the following technical solutions are adopted: An anti-wear and corrosion-resistant lubricating oil contains the following components: 88-92 parts of base oil, 3-6 parts of graphene oxide grafted with phosphate ester and phosphoric acid amide, 0.5-1 part of detergent-dispersant, 0.5-1 part of rust inhibitor, 2-4 parts of antioxidant, 0.5-1 part of defoamer, and 0.5-1 part of pour point depressant.

[0009] The preparation method of graphene oxide grafted with phosphate ester and phosphoric acid amide is as follows: (1) Disperse graphene oxide (GO) in deionized water, and perform ultrasonic treatment 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.

[0010] (2) Mix the phosphoric acid esterification reagent and the imidazole-based ionic liquid catalyst in a mass ratio of 1:0.01-0.1; Dropwise add the mixed reagent into the graphene oxide dispersion, heat to 60-90 °C under nitrogen protection, and react for 6-24 hours; Remove the unreacted reagent by centrifugation or dialysis to obtain phosphate ester grafted graphene oxide (P-GO).

[0011] (3) Mix the phosphoric acid amination reagent and triethylamine in a mass ratio of 1:0.05-0.2; Add the mixed reagent to the P-GO dispersion, heat to 70-90 °C under nitrogen protection, and react for 6-12 hours; Remove the unreacted reagent by centrifugation or dialysis, and perform centrifugal cleaning with anhydrous ethanol and deionized water for 2-5 times respectively, and place it in a vacuum dryer at 25-40 °C for drying for 24-72 h; Obtain graphene oxide grafted with phosphate ester and phosphoric acid amide (PAP-GO).

[0012] Further, the phosphoric acid esterifying reagent is one or more of isooctyl phosphate, isononyl phosphate, isodecyl phosphate, dodecyl phosphate, and the phosphoric acid aminating reagent is one or more of decylamine phosphate, dodecylamine phosphate, tetradecylamine phosphate, octadecylamine phosphate, eicosylamine phosphate. The mass ratios of the phosphoric acid esterifying reagent, the phosphoric acid aminating reagent to graphene oxide are respectively (8 - 12):1. The imidazole-based ionic liquid catalyst is selected from one or more of 1-butyl-3-methylimidazolium tetrafluoroborate, 1-ethyl-3-methylimidazolium tetrafluoroborate, 1-butyl-3-methylimidazolium hexafluorophosphate.

[0013] Further, the number of layers of the graphene oxide is 1 - 10 layers, the sheet thickness is 0.8 - 1.2 nm, and the particle size is 1 - 10 μm.

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

[0015] Preferably, the detergent-dispersant is one or more of polyisobutylene bisuccinimide, diallyl succinimide, borated polyisobutylene succinimide.

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

[0017] Further, the aromatic amine antioxidant is one or more of octyldiphenylamine, butyldiphenylamine, monononyldiphenylamine, α-naphthylamine, phenyl-α-naphthylamine, butylphenyl-α-naphthylamine. The hindered phenol is 2,6-di-tert-butyl-4-methylphenol or 2,6-di-tert-butylphenol.

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

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

[0020] Further, the present invention also provides a preparation method of the anti-wear and corrosion-resistant lubricating oil, comprising the following steps:

[0021] (1) Heat the base oil to 40 - 60 °C, 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 °C, stir for 1 - 2 h, cool down to 40 - 50 °C, and then add phosphate ester and phosphoric acid amide to graft graphene oxide, pour point depressant, and defoamer while stirring according to the ratio, and continue to stir for 1 - 2 h to obtain an anti-wear and corrosion-resistant lubricating oil.

[0023] In the present invention, the phosphate ester groups in PAP-GO undergo chemical reactions with the metal surface during the friction process to form a phosphate protective film; at the same time, the phosphoric acid amide groups form a dense organic film on the metal surface through adsorption, further reducing the friction coefficient. The structure of the double film can enhance the durability and strength of the protective film. The lamellar structure of graphene oxide slips during the friction process to form a "nano-bearing" effect, reducing direct metal contact; the two-dimensional structure of PAP-GO can effectively fill surface microcracks and repair the worn area. Therefore, the anti-wear performance can be further improved through the synergistic effect of phosphate ester and phosphoric acid amide groups and the special structure of graphene oxide.

[0024] Since the phosphoric acid amide groups in PAP-GO are alkaline, they can neutralize the acidic substances generated during the use of the lubricating oil to prevent corrosion of the metal surface; at the same time, the phosphate ester groups have a chelating effect to adsorb metal ions and inhibit electrochemical corrosion. In addition, the phosphate ester and phosphoric acid amide groups of PAP-GO react with the metal surface to form a stable passivation film, which can effectively prevent the penetration of moisture, oxygen, and corrosive media; further enhancing the anti-corrosion effect.

[0025] The phosphate ester and phosphoric acid amide groups in PAP-GO can capture the free radicals generated during the oxidation process of the lubricating oil and interrupt the chain reaction; the high specific surface area of graphene oxide provides more active sites, enhancing the antioxidant effect. The phosphate ester groups have flame retardant, anti-wear, and metal chelating properties, while the phosphoric acid amide groups have excellent anti-wear and extreme pressure properties. Grafting the two onto the surface of graphene oxide can endow the material with synergistic properties.

[0026] Compared with the prior art, the present invention has the following technical advantages: PAP-GO has anti-wear, anti-corrosion, and antioxidant properties at the same time, solving the problem of single function of traditional additives; PAP-GO can still maintain stable performance under high temperature, high load, and extreme environments, extending the service life of the lubricating oil; further improving the comprehensive performance of the lubricating oil.

[0027] At the same time, the present invention combines the different action mechanisms of hindered phenol antioxidants and aromatic amine antioxidants to inhibit oxidation reactions, and the synergistic effect of PAP-GO and composite antioxidants significantly extends the service life of the lubricating oil. Specific embodiments:

[0028] To make the objectives, technical solutions, and advantages of the present invention more clear, the following further illustrates the technical solutions of the present invention through specific embodiments. Those skilled in the art should understand that the embodiments are only for helping to understand the technical content and technical effects of the present invention and should not be regarded as a limitation to the present invention.

[0029] The graphene oxide 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 phosphate ester and phosphonic acid amide on graphene oxide (PAP-GO-1)

[0031] (1) Disperse graphene oxide in deionized water and ultrasonically treat for 2 hours to obtain a uniform dispersion with a concentration of 2 mg / mL; add sodium hydroxide solution to adjust the pH of the solution to 9.

[0032] (2) Mix isononyl phosphate and 1-butyl-3-methylimidazolium tetrafluoroborate in a mass ratio of 1:0.01; gradually add the mixed reagent dropwise to the graphene oxide dispersion (the mass ratio of isononyl phosphate to graphene oxide is 10:1), heat to 70 °C under nitrogen protection, and react for 12 hours; remove the unreacted reagent by centrifugation or dialysis to obtain phosphate ester grafted graphene oxide (P-GO-1).

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

[0034] Manufacturing Example 2: Co-grafting of phosphate ester and phosphonic acid amide on graphene oxide (PAP-GO-2)

[0035] (1) Disperse graphene oxide in deionized water and ultrasonically treat for 2 hours to obtain a uniform dispersion with a concentration of 4 mg / mL; add sodium hydroxide solution to adjust the pH of the solution to 9.

[0036] (2) Mix isodecyl phosphate and 1-ethyl-3-methylimidazolium tetrafluoroborate in a mass ratio of 1:0.01; gradually 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 the unreacted reagent by centrifugation or dialysis to obtain phosphate ester grafted graphene oxide (P-GO-2).

[0037] (3) Mix octadecylamine phosphate reagent 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 the unreacted reagent by centrifugation or dialysis, wash 3 times by centrifugation with absolute ethanol and deionized water respectively, and dry in a vacuum dryer at 40 °C for 48 h; obtain graphene oxide grafted with phosphate ester and phosphate amine (PAP-GO-2).

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

[0039] (1) Disperse graphene oxide in deionized water, ultrasonically treat for 2 hours to obtain a uniform dispersion with a concentration of 2 mg / mL; add sodium hydroxide solution to adjust the pH of the solution to 9.

[0040] (2) Mix isononyl phosphate and 1-butyl-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 isononyl phosphate to graphene oxide is 20:1), heat to 70 °C under nitrogen protection, and react for 12 hours; remove the unreacted reagent by centrifugation or dialysis, wash 3 times by centrifugation with absolute ethanol and deionized water respectively, and dry in a vacuum dryer at 40 °C for 48 h; obtain phosphate ester grafted graphene oxide (P-GO-3).

[0041] Production Example 4: Phosphate Amine Grafted Graphene Oxide (AP-GO-4)

[0042] (1) Disperse graphene oxide in deionized water, ultrasonically treat for 2 hours to obtain a uniform dispersion with a concentration of 2 mg / mL; add sodium hydroxide solution 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 the unreacted reagent by centrifugation or dialysis, wash 3 times by centrifugation with absolute ethanol and deionized water respectively, and dry in a vacuum dryer at 40 °C for 48 h; obtain graphene oxide grafted with phosphate ester and phosphate amine (AP-GO-4).

[0044] A total of 3 examples and 3 comparative examples were carried out in the present invention.

[0045] Example 1:

[0046] (1) Heat 900 g of PAO4 to 60 °C, then add 10 g of polyisobutylene bis-succinimide, 10 g of octyldiphenylamine, and 10 g of 2,6-di-tert-butylphenol while stirring, and stir at 300 rpm for 30 min 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, then add 60 g of PAP-GO-1 (Production Example 1), 5 g of polydimethylsiloxane defoamer, and 5 g of polymethacrylate while stirring according to the ratio, and continue to stir for 2 h to obtain a composite lubricating oil.

[0048] Example 2:

[0049] (1) Heat 900 g of PAO6 to 60 °C, then add 10 g of diallyl succinimide, 10 g of butyldiphenylamine, and 10 g of 2,6-di-tert-butyl-4-methylphenol while stirring, and stir at 400 rpm for 30 min to obtain a mixture;

[0050] (2) Heat the mixture obtained in step (1) to 110 °C, stir for 2 h, cool down to 50 °C, then add 40 g of PAP-GO-2 (Production Example 2), 5 g of polydimethylsiloxane defoamer, and 5 g of ethylene-vinyl acetate copolymer while stirring according to the ratio, and continue to stir for 1.5 h to obtain a composite lubricating oil.

[0051] Example 3:

[0052] (1) Heat 900 g of PAO4 to 50 °C, then add 8 g of polyisobutylene bis-succinimide, 15 g of octyldiphenylamine, and 15 g of 2,6-di-tert-butylphenol while stirring, and stir at 300 rpm for 30 min to obtain a mixture;

[0053] (2) Heat the mixture obtained in step (1) to 100 °C, stir for 2 h, cool down to 40 °C, then add 50 g of PAP-GO-1 (Production Example 1), 5 g of polydimethylsiloxane defoamer, and 5 g of polymethacrylate while stirring according to the ratio, and continue to stir for 2 h to obtain a composite lubricating oil.

[0054] Comparative Example 1:

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

[0056] Comparative Example 2:

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

[0058] Comparative Example 3:

[0059] It is only different from Example 3 in that 25 g of isononyl phosphate and 25 g of dodecylamine phosphate are used to replace PAP-GO-1.

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

[0061] Wear resistance test: According to the method of GB / T 12583-2018, the top ball of a four-ball machine rotates against 3 steel balls under a fixed pressure of 392 N, the rotation speed is 1200 r / min, the experimental temperature is 75 °C at high temperature, and the time of each experiment is 60 min. The measured wear scar diameter is used as the basis for wear resistance.

[0062] Corrosion resistance test: According to the method of ASTM D130, the cleaned copper sheet is vertically immersed in the lubricating oil in the test tube; ensure that the copper sheet is completely immersed, put the test tube into a constant temperature bath, heat it at 100 °C for 3 hours, after the heating is completed, take out the copper sheet, and clean the copper sheet, compare the copper sheet with the corrosion standard colorimetric plate, record the color change of the copper sheet; evaluate the corrosion grade (1a-4c level) according to the color change; the copper sheet is made of electrolytic copper with a purity of more than 99.9% and a size of 75 mm * 12.5 mm * 1.5 mm.

[0063] Oxidation stability test: According to the method of ASTM D943, pour 300 mL of the lubricating oil sample into the oxidation tube; add 60 mL of deionized water; immerse the cleaned copper sheet in the lubricating oil sample; put the oxidation tube into a constant temperature bath and heat it to 95 °C; introduce oxygen, and control the flow rate at 3 L / h; take out 1 g of the lubricating oil sample from the oxidation tube every 24 hours; use a potentiometric titrator or manual titration method to measure the acid value of the lubricating oil; record the change of the acid value with time. The copper sheet is made of electrolytic copper with a purity of more than 99.9% and a size of 75 mm * 12.5 mm * 1.5 mm. When the acid value of the lubricating oil reaches 2.0 mg KOH / g, the test is terminated; the time from the start to the acid value reaching 2.0 mg KOH / g (oxidation induction period) is used as the basis for oxidation stability. The longer the time, the better the oxidation stability.

[0064] Table 1: Wear resistance, corrosion resistance and oxidation stability results of examples and comparative examples

[0065] Number Wear scar diameter / mm Corrosion grade Oxidation induction period / h Example 1 0.376 1a 2232 Example 2 0.390 1a 2184 Example 3 0.384 1a 2064 Comparative example 1 0.472 2b 1728 Comparative example 2 0.459 2b 1968 Comparative example 3 0.536 1a 1920

[0066] From the results of Example 1 and Comparative Example 1, it can be seen that the phosphoamine group can form a dense organic film on the metal surface through adsorption, significantly reducing the friction coefficient, while neutralizing the acidic substances in the lubricating oil and inhibiting metal corrosion. In addition, the phosphoamine group can also capture free radicals and delay the oxidation process of the lubricating oil. Therefore, P-GO-3 lacking phosphoamine groups cannot fully exert these functions, and the anti-wear, anti-corrosion and anti-oxidation properties of the lubricating oil are all reduced.

[0067] From the results of Example 2 and Comparative Example 2, since the phosphate group can react chemically with the metal surface during the friction process to form a phosphate protective film, it effectively reduces direct metal contact, thereby improving the anti-wear performance. At the same time, the phosphate group adsorbs metal ions through chelation to inhibit electrochemical corrosion. In addition, the phosphate group can also synergize with the phosphate amine group to enhance the antioxidant properties of the lubricant. Therefore, AP-GO-4 lacking a phosphate group cannot form a complete protective film, resulting in a decrease in the performance of the lubricant.

[0068] From the results of Example 3 and Comparative Example 3, since the two-dimensional structure of graphene oxide can serve as an efficient carrier, the phosphate ester and phosphate amine groups are evenly dispersed, and the "nanobearing" effect is exerted during the friction process, further reducing the friction coefficient. At the same time, the high specific surface area of ​​graphene oxide provides more active sites, enhancing the antioxidant effect. Since phosphate ester and phosphate amine are directly added in the comparative example, the carrier effect of graphene oxide is lacking, and the additives are easily agglomerated and cannot be evenly distributed in the lubricating oil, resulting in a significant decrease in anti-wear and antioxidant properties.

[0069] It should be noted that the present application is not limited to the above-mentioned embodiments. The above-mentioned embodiments are only examples, and the embodiments having the same structure as the technical idea and exerting the same effect within the scope of the technical solution of the present application are all included in the technical scope of the present application. In addition, without departing from the scope of the main purpose of the present application, various modifications that can be thought of by those skilled in the art to the embodiments and other methods of combining some of the constituent elements in the embodiments are also included in the scope of the present application.

Claims

1. A wear-resistant and corrosion-resistant lubricating oil, characterized in that: The invention comprises the following components: 88-92 parts of base oil, 3-6 parts of graphene oxide grafted with phosphate ester and phosphate amine, 0.5-1 part of detergent dispersant, 0.5-1 part of rust inhibitor, 2-4 parts of antioxidant, 0.5-1 part of defoamer and 0.5-1 part of pour point depressant.

2. The anti-wear and corrosion-resistant lubricating oil according to claim 1, characterized in that: The preparation method of graphene oxide grafted with phosphate ester and phosphate amine is as follows: (1) dispersing graphene oxide in deionized water, ultrasonically treating for 1-3 hours to obtain a uniform dispersion with a concentration of 1-10 mg / mL; adding sodium hydroxide to adjust the solution pH to 8-10; (2) mixing a phosphating agent and an imidazole ionic liquid catalyst in a mass ratio of 1:0.01-0.1; Adding the mixed reagent dropwise into the graphene oxide dispersion, heating to 60-90° C. under nitrogen protection, and reacting for 6-24 hours; removing the unreacted reagent by centrifugation or dialysis to obtain phosphate-grafted graphene oxide; (3) Mixing a phosphoric acid amination reagent and triethylamine in a mass ratio of 1:0.05-0.2; adding the mixed reagent to a P-GO dispersion, heating to 70-90°C under nitrogen protection, and reacting for 6-12 hours; removing unreacted reagents by centrifugation or dialysis, washing with anhydrous ethanol and deionized water by centrifugation for 2-5 times respectively, and drying in a vacuum dryer at 25-40°C for 24-72 hours; obtaining phosphate ester and phosphoric acid amine co-grafted graphene oxide.

3. The anti-wear and corrosion-resistant lubricating oil according to claim 2, characterized in that: The phosphating agent is one or more of isooctyl phosphate, isononyl phosphate, isodecyl phosphate, and dodecyl phosphate; the phosphating amination agent is one or more of decylamine phosphate, dodecylamine phosphate, tetradecylamine phosphate, octadecylamine phosphate, and eicosylamine phosphate; and the mass ratios of the phosphating agent, the phosphating amination agent, and the graphene oxide are (8-12):1, respectively.

4. The anti-wear and corrosion-resistant lubricating oil according to claim 2, 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.

5. The anti-wear and corrosion-resistant lubricating oil according to claim 2, characterized in that: The graphene oxide has 1 to 10 layers, a sheet thickness of 0.8 to 1.2 nm, and a particle size of 1 to 10 μm.

6. 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 hydrogenated base oil and poly alpha olefin PAO.

7. The anti-wear and corrosion-resistant lubricating oil according to claim 1, characterized in that: The detergent dispersant is one or more of polyisobutylene bissuccinimide, bis-alkenyl succinimide, and boronated polyisobutylene succinimide; the defoamer is one of polydimethylsiloxane defoamer and fluorinated polysiloxane defoamer; the pour point depressant is one or more of polymethacrylate, ethylene-vinyl acetate copolymer, and styrene-fumarate copolymer.

8. The anti-wear and corrosion-resistant lubricating oil according to claim 1, characterized in that: The antioxidant is a compound of an aromatic amine antioxidant and a hindered phenol antioxidant, wherein the aromatic amine antioxidant is 1-2 parts and the hindered phenol antioxidant is 1-2 parts.

9. The anti-wear and corrosion-resistant lubricating oil according to claim 8, characterized in that: The aromatic amine antioxidant is one or more of octyl diphenylamine, butyl diphenylamine, monononyl diphenylamine, α-naphthylamine, phenyl-α-naphthylamine, and butylphenyl-α-naphthylamine. The hindered phenol is 2,6-di-tert-butyl-4-methylphenol or 2,6-di-tert-butylphenol.

10. The method for preparing an anti-wear and corrosion-resistant lubricating oil according to any one of claims 1 to 9, characterized in that The following steps are involved: (1) heating the base oil to 40-60° C., then adding a detergent dispersant and an antioxidant while stirring, and stirring at 200-500 rpm for 20-40 minutes to obtain a mixture; (2) The mixture obtained in step (1) is heated to 100-110° C., stirred for 1-2 hours, cooled to 40-50° C., and then phosphate ester and phosphate amine are added in proportion while stirring to graft graphene oxide, pour point depressant, and defoamer, and stirring is continued for 1-2 hours to obtain a wear-resistant and corrosion-resistant lubricating oil.