An extreme pressure anti-wear self-healing lubricating oil additive, its preparation method, and its application in lubricating oils.

Abstract

This invention provides an extreme pressure anti-wear self-healing lubricating oil additive, its preparation method, and its application in lubricating oil. The extreme pressure anti-wear self-healing lubricating oil additive is composed of the following components in parts by weight: 5-15 parts modified graphene oxide, 30-50 parts antioxidant, 10-30 parts anti-wear agent, and 10-30 parts extreme pressure agent. The modified graphene oxide is obtained by reacting carboxylated graphene oxide loaded with nano-silica with linoleamide borate, and then copolymerizing it with acrylate. This invention employs in-situ hydrolysis of tetraethoxysilane to graft nano-silica onto the surface of graphene oxide, followed by carboxylation modification with KH550 and succinic anhydride to obtain carboxyl active sites on the RGO-S surface, which is then grafted with linoleamide borate to form a composite structure with both extreme pressure film-forming and self-healing functions. Polymer chains are constructed on the surface of the composite through free radical polymerization to enhance component compatibility and triboelectric film-forming properties.

Description

Technical Field

[0001] This invention relates to the field of lubricating oil additives, specifically to an extreme pressure anti-wear self-healing lubricating oil additive, its preparation method, and its application in lubricating oils. Background Technology

[0002] In the context of rapid development in industrial equipment, lubricating oil, as a key medium for reducing mechanical friction and wear, directly determines the service life and energy efficiency of equipment. Statistics show that energy consumption due to friction accounts for approximately 30% of global energy consumption, while the proportion of mechanical parts scrapped due to wear is as high as 80%. With the increasing prevalence of extreme operating conditions (such as high load, high temperature, and high speed), traditional lubricating oils are unable to meet continuous lubrication needs. There is an urgent need to enhance their extreme pressure anti-wear properties and endow them with self-healing capabilities through additives to address the dynamic repair requirements of micro-damage on metal surfaces.

[0003] Currently, common extreme pressure anti-wear self-healing additives mainly include sulfur-phosphorus compounds (such as zinc dialkyl dithiophosphate), organoboroates, nano-metal particles (such as copper and molybdenum compounds), and layered materials (such as molybdenum disulfide and graphite). For example, through the synergistic effect of borate esters and copper salts, a boron-reinforced layer and a copper repair film can be formed on the friction surface; while the dispersion of nano-sulfides depends on surfactants or mechanical mixing processes. Existing preparation methods mostly employ physical mixing of components or high-temperature reactions, such as compounding chloroalkanes, dialkyl dithiocarbamates with antioxidants, or dispersing nanoparticles in base oil and improving stability through microwave-ultrasonic treatment. However, these methods often rely on the chemical action of a single active element or achieve functional superposition through simple compounding of multiple components, lacking a systematic synergistic mechanism design.

[0004] The shortcomings of existing technologies are mainly reflected in the limitations of their anti-wear and self-healing capabilities. First, although sulfur and phosphorus additives can form extreme pressure films, they are easily consumed rapidly under high loads, leading to a shortened oil life, and sulfides are prone to causing metal corrosion; while chlorinated compounds are resistant to high temperatures, they pose a risk of hydrolysis, limiting their application scenarios. Second, although nanomaterials (such as MoS2) can enhance anti-wear properties, their dispersion stability is poor, they are prone to agglomeration forming abrasive particles that exacerbate wear, and their preparation process is complex and costly. In addition, self-healing functions mostly rely on metal deposition or physical adsorption films. These films have weak adhesion to the substrate and are easily detached under dynamic shear, making it difficult to achieve continuous repair. For example, the protective film formed by the combination of traditional borate esters and copper salts is prone to oxidation and failure at high temperatures, and the phase separation problem caused by poor compatibility between additive components has not been solved, further weakening the long-term stability of the lubrication system.

[0005] In conclusion, it is necessary to develop a new technical solution to address the problems existing in the current technology. Summary of the Invention

[0006] This invention provides an extreme pressure anti-wear self-healing lubricant additive. The invention utilizes in-situ hydrolysis of tetraethoxysilane to graft nano-silica onto the surface of graphene oxide, inhibiting graphene sheet aggregation through structural support while simultaneously exerting a synergistic lubrication effect. Carboxylation modification with KH550 and succinic anhydride creates carboxyl active sites on the RGO-S surface, which are then grafted with linoleamide borate ester to form a composite structure possessing both extreme pressure film-forming and self-healing functions. Free radical polymerization constructs polymer chains on the composite surface, enhancing component compatibility and triboelectric film-forming properties. Furthermore, this invention combines the extreme pressure anti-wear self-healing lubricant additive with polyacrylic acid-modified molybdenum disulfide, significantly improving the friction-reducing and anti-wear performance of the lubricant system through the synergistic effect of layered materials and organic molecules.

[0007] One object of the present invention is to provide an extreme pressure anti-wear self-healing lubricating oil additive, wherein the extreme pressure anti-wear self-healing lubricating oil additive is composed of the following components in parts by weight:

[0008]

[0009] in,

[0010] The modified graphene oxide is obtained by reacting carboxylated graphene oxide loaded with nano-silica with linoleamide borate, and then copolymerizing it with acrylate.

[0011] Furthermore, the antioxidant is selected from one or more of 2,6-di-tert-butyl-p-cresol, 2,4,6-tri-tert-butylphenol, or 2,6-di-tert-butyl-4-nonylphenol.

[0012] Furthermore, the anti-wear agent is selected from one or more of phosphate ester derivatives, organosulfur and phosphorus compounds, amine phosphates, or polyphosphoric acid.

[0013] Furthermore, the extreme pressure agent is selected from one or more of sulfurized olefins, sulfurized fatty acids, or sulfurized fatty acid esters.

[0014] Another object of the present invention is to provide a method for preparing the above-mentioned extreme pressure anti-wear self-healing lubricating oil additive, comprising the following steps:

[0015] S1. Graphene oxide and tetraethoxysilane are blended and reacted under alkaline conditions to obtain graphene oxide loaded with nano-silica; silane coupling agent KH550 and succinic anhydride are blended and reacted under stirring, and then the graphene oxide loaded with nano-silica is added and the reaction is continued under stirring to obtain carboxylated graphene oxide loaded with nano-silica.

[0016] S2. Boric acid and diethanolamine are mixed and heated and stirred to obtain an intermediate; the intermediate is mixed with linoleic acid, a catalyst is added, and the mixture is heated to obtain linoleamide borate ester.

[0017] S3. The carboxylated graphene oxide supported on nano-silica and linoleamide borate are blended, a catalyst is added, and the mixture is heated to obtain an intermediate product; the intermediate product is blended with acrylate, an initiator is added, and the mixture is heated to obtain modified graphene oxide.

[0018] S4. Mix all components evenly to obtain extreme pressure anti-wear self-repairing lubricating oil additive.

[0019] Further, in step S1, the mass ratio of graphene oxide to tetraethoxysilane is 1:(5-15); the mass ratio of graphene oxide loaded with nano-silica, silane coupling agent KH550 and succinic anhydride is 1:(0.01-0.5):(0.01-0.5).

[0020] Further, in step S2, the molar ratio of boric acid to diethanolamine is 1:(2-3), and the heating temperature is 150-180℃; the molar ratio of the intermediate to linoleic acid is 1:(0.5-0.9).

[0021] Further, in step S3, the molar ratio of the carboxylated supported nano-silica graphene oxide to linoleamide borate is 1:(0.5-1.5); the molar ratio of the intermediate product to acrylate is 1:(0.1-1).

[0022] Another object of the present invention is to provide the application of the above-mentioned extreme pressure anti-wear self-healing lubricating oil additive in a lubricating oil, wherein the lubricating oil comprises the following components in parts by weight:

[0023] 80-100 parts base oil

[0024] Extreme pressure anti-wear self-healing lubricant additive 5-15 parts

[0025] 1-5 parts of modified molybdenum disulfide

[0026] 8-40 parts of auxiliary agent;

[0027] in,

[0028] The modified molybdenum disulfide is obtained by reacting hydroxylated molybdenum disulfide with polyacrylic acid.

[0029] Furthermore, the base oil is selected from one or more of mineral base oils, synthetic base oils, or bio-based base oils.

[0030] Furthermore, the preparation method of the modified molybdenum disulfide includes the following steps: mixing molybdenum disulfide and mercaptoethanol, sonicating, and then freeze-drying to obtain hydroxylated molybdenum disulfide; mixing the hydroxylated molybdenum disulfide and polyacrylic acid, and heating to react to obtain polyacrylic acid modified molybdenum disulfide.

[0031] Furthermore, the additive is selected from one or more of preservatives, rust inhibitors, dispersants, or defoamers.

[0032] Further, the corrosion inhibitor is selected from one or more of zinc dialkyl dithiophosphate or zinc dialkyl dithiocarbamate, and the dosage is 1-10 parts; the rust inhibitor is selected from one or more of sodium carboxylate or sodium sulfonate, and the dosage is 5-10 parts; the dispersant is selected from one or more of succinate or succinimide, and the dosage is 3-8 parts; the defoamer is dimethyl silicone oil, and the dosage is 0.1-1 parts.

[0033] The present invention has the following beneficial effects:

[0034] (1) This invention first grafts nano-silica onto the surface of graphene oxide using a tetraethoxysilane in-situ hydrolysis method to obtain graphene oxide loaded with nano-silica (RGO-S). The nano-silica can support the sheet structure of graphene oxide, increase the interlayer spacing, effectively reduce the aggregation of graphene oxide, and improve its dispersion stability in lubricating oil additives. During friction, RGO-S can enter the friction contact surface to form a thin film, improving the tribological properties of the material. At the same time, it can reduce the coefficient of friction through the micro-rolling effect, improve the load-bearing capacity, and fill the wear positions such as microcracks and micro-pits on the surface of the friction pair, playing a self-repairing role. In addition, graphene oxide and nano-silica can play a synergistic lubricating role, which is conducive to the retention of RGO-S and enhances the self-repair effect. Subsequently, carboxyl groups were grafted onto the ends of KH550 by reacting it with succinic anhydride, and then introduced into RGO-S through condensation of siloxane groups with hydroxyl groups on the surface of RGO-S. This was followed by reaction with linoleamide borate ester, which has amino active sites, successfully introducing linoleamide borate ester into RGO-S. Linoleamide borate ester can form a heterogeneous extreme pressure film on the friction metal surface, providing friction reduction and anti-wear effects, while also protecting RGO-S, reducing its wear, and further enhancing its self-healing effect. Furthermore, this invention also involves free radical polymerization of the obtained RGO-S-linoleamide borate ester (intermediate product) with acrylate to form polymer chains on the surface of RGO-S-linoleamide borate ester. The formation of these polymer chains enhances the compatibility and dispersibility of RGO-S-linoleamide borate ester with other components, and also enhances its film-forming properties, further strengthening its friction reduction, anti-wear effect, and self-healing properties.

[0035] (2) The present invention also combines extreme pressure anti-wear self-healing lubricant additive with modified molybdenum disulfide and applies it to lubricant products. The modified molybdenum disulfide has polyacrylic acid segments grafted onto its surface, which is beneficial to improve its dispersibility, enhance its film-forming properties, and can work synergistically with extreme pressure anti-wear self-healing lubricant additive to further enhance the anti-wear and self-healing properties of lubricant products. Detailed Implementation

[0036] To more clearly illustrate the technical solution of the present invention, the following embodiments are provided. Unless otherwise stated, the raw materials, reactions, and post-processing methods appearing in the embodiments are all commercially available raw materials and technical methods well known to those skilled in the art.

[0037] The terms "preferred," "more preferably," and "more suitable" used in this invention refer to embodiments of the invention that provide certain beneficial effects under certain circumstances. However, other embodiments may also be preferred under the same or other circumstances. Furthermore, the description of one or more preferred embodiments does not imply that other embodiments are unavailable, nor is it intended to exclude other embodiments from the scope of this invention.

[0038] It should be understood that, except in any operational instance or otherwise indicated, the amounts or all figures representing ingredients used, for example, in the specification and claims, should be understood to be modified by the term "about" in all cases. Therefore, unless otherwise stated, the numerical parameters set forth in the following specification and appended claims are approximate values ​​varying according to the desired performance to be obtained according to the invention.

[0039] The present invention uses the following raw materials:

[0040] Antioxidant: 2,6-di-tert-butyl-p-cresol.

[0041] Anti-wear agent: Triphenyl phosphate.

[0042] Extreme pressure agent: trichlorophenyl thiophosphate.

[0043] Graphene oxide: grade M83920, purchased from Shanghai Mairui Biochemical Technology Co., Ltd.

[0044] Base oil: 500N mineral base oil.

[0045] Preservative: Zinc dialkyl dithiophosphate.

[0046] Rust inhibitor: Sodium carboxylate.

[0047] Dispersant: Succinimide.

[0048] Defoamer: Dimethyl silicone oil.

[0049] The preparation method of modified molybdenum disulfide includes the following steps:

[0050] Using water as a solvent, molybdenum disulfide and mercaptoethanol were blended (molybdenum disulfide:mercaptoethanol = 1:3, m / m), sonicated for 48 h, and then freeze-dried at -50 °C for 24 h. After washing and drying, hydroxylated molybdenum disulfide was obtained. Using anhydrous ethanol as a solvent, the hydroxylated molybdenum disulfide and polyacrylic acid were blended (hydroxylated molybdenum disulfide:polyacrylic acid = 1:3, m / m), heated under reflux for 2 h, cooled, filtered, washed, and dried to obtain modified molybdenum disulfide.

[0051] Polyacrylic acid: average molecular weight 3000, purchased from Beijing Wokai Biotechnology Co., Ltd.

[0052] All water used in this invention is deionized water.

[0053] In this invention, "parts" refers to parts by mass.

[0054] Example 1

[0055] An extreme pressure anti-wear self-healing lubricating oil additive, wherein the extreme pressure anti-wear self-healing lubricating oil additive is composed of the following components in parts by weight:

[0056]

[0057] in,

[0058] The modified graphene oxide is obtained by reacting carboxylated graphene oxide loaded with nano-silica with linoleamide borate, and then copolymerizing it with methyl acrylate.

[0059] The preparation method of the above-mentioned extreme pressure anti-wear self-repairing lubricating oil additive includes the following steps:

[0060] S1. Add 0.3 parts of graphene oxide to 85 parts of anhydrous ethanol-water mixed solution (anhydrous ethanol:water = 24:1, v / v), and ultrasonically disperse for 30 min to form a suspension. Then add 6 parts of ammonia solution (25wt%), stir evenly, and then add 3 parts of tetraethoxysilane. Stir and react at room temperature for 24 h. Filter, wash, and dry to obtain graphene oxide loaded with nano-silica. Disperse it in DMF to prepare a suspension for later use. Using DMF as solvent, mix silane coupling agent KH550 and succinic anhydride and stir and react for 3 h. Then add the graphene oxide suspension loaded with nano-silica (graphene oxide loaded with nano-silica:silane coupling agent KH550:succinic anhydride = 1:0.1:0.1, m / m / m), and continue stirring and reacting for 5 h. Wash and dry to obtain carboxylated graphene oxide loaded with nano-silica.

[0061] S2. Using xylene as a solvent, boric acid and diethanolamine are blended (boric acid: diethanolamine = 1:2.5, n / n), and the mixture is stirred at 160°C. The reaction is stopped when the amount of water produced is close to the theoretical value. The mixture is then rotary evaporated and washed to obtain an intermediate. Using xylene as a solvent, the intermediate is blended with linoleic acid (intermediate: linoleic acid = 1:0.9, n / n), and the mixture is heated under reflux. The reaction is stopped when the amount of water produced no longer increases. The mixture is then distilled under reduced pressure and washed to obtain linoleamide borate ester.

[0062] S3. Using xylene as a solvent, the carboxylated graphene oxide supported on nano-silica and linoleamide borate ester (carboxylated graphene oxide supported on nano-silica: linoleamide borate ester = 1:1, n / n) are blended and heated under reflux until the amount of water discharged no longer increases. The reaction is then stopped, followed by vacuum distillation and washing to obtain an intermediate product. Using water as a solvent, the intermediate product is blended with methyl acrylate (intermediate product: methyl acrylate = 1:0.5, n / n), and 1 wt% sodium persulfate is added. The mixture is reacted at 80°C for 12 h, filtered, washed, and dried to obtain modified graphene oxide.

[0063] S4. Mix all components evenly according to the above mass fractions to obtain extreme pressure anti-wear self-repairing lubricating oil additive.

[0064] Example 2

[0065] An extreme pressure anti-wear self-healing lubricant additive, wherein the extreme pressure anti-wear self-healing lubricant additive is composed of the following components in parts by weight:

[0066]

[0067] in,

[0068] The modified graphene oxide is obtained by reacting carboxylated graphene oxide loaded with nano-silica with linoleamide borate, and then copolymerizing it with ethyl 2-methacrylate.

[0069] The preparation method of the above-mentioned extreme pressure anti-wear self-repairing lubricating oil additive is the same as that in Example 1.

[0070] Example 3

[0071] An extreme pressure anti-wear self-healing lubricant additive, wherein the extreme pressure anti-wear self-healing lubricant additive is composed of the following components in parts by weight:

[0072]

[0073] in,

[0074] The modified graphene oxide is obtained by reacting carboxylated graphene oxide loaded with nano-silica with linoleamide borate, and then copolymerizing it with methyl 2-methacrylate.

[0075] The preparation method of the above-mentioned extreme pressure anti-wear self-repairing lubricating oil additive is the same as that in Example 1.

[0076] Comparative Example 1

[0077] An extreme pressure anti-wear self-healing lubricating oil additive, the difference between this comparative example and Example 1 is that step S1 is changed to:

[0078] Using DMF as a solvent, silane coupling agent KH550 and succinic anhydride were mixed and stirred for 3 hours. Then, a graphene oxide suspension (graphene oxide: silane coupling agent KH550: succinic anhydride = 1:0.1:0.1, m / m / m) was added, and the mixture was stirred for another 5 hours. After washing and drying, carboxylated graphene oxide was obtained.

[0079] In step S3, the equimolar mass of the carboxylated graphene oxide loaded with nano-silica is replaced with carboxylated graphene oxide, and the amounts of other components and the preparation method are the same as in Example 1.

[0080] Comparative Example 2

[0081] An extreme pressure anti-wear self-repairing lubricating oil additive. The difference between this comparative example and Example 1 is that step S2 is omitted. In step S3, the equimolar mass of the linoleamide borate ester is replaced with linoleamide. The dosage of other components and the preparation method are the same as in Example 1.

[0082] Comparative Example 3

[0083] An extreme pressure anti-wear self-repairing lubricating oil additive. The difference between this comparative example and Example 1 is that in step S3, the intermediate product and methyl acrylate are blended, but no copolymerization reaction is carried out. The dosage of other components and the preparation method are the same as in Example 1.

[0084] Application Example 1

[0085] A lubricating oil comprising the following components in parts by weight:

[0086]

[0087] in,

[0088] The extreme pressure anti-wear self-healing lubricating oil additive was prepared in Example 1.

[0089] The preparation method of the above-mentioned lubricating oil includes the following steps:

[0090] According to the above-mentioned mass proportions, heat the base oil to 50°C, add the corrosion inhibitor, rust inhibitor, and dispersant while continuously stirring, stir for 30 minutes, cool to 35°C, add the defoamer, continue stirring for 30 minutes, filter, and package to obtain the lubricating oil.

[0091] Application Example 2

[0092] A lubricating oil comprising the following components in parts by weight:

[0093]

[0094]

[0095] in,

[0096] The extreme pressure anti-wear self-healing lubricating oil additive was prepared in Example 2.

[0097] The preparation method of the above-mentioned lubricating oil is the same as that in application example 1.

[0098] Application Example 3

[0099] A lubricating oil comprising the following components in parts by weight:

[0100]

[0101] in,

[0102] The extreme pressure anti-wear self-healing lubricating oil additive was prepared in Example 3.

[0103] The preparation method of the above-mentioned lubricating oil is the same as that in application example 1.

[0104] Comparative Application Example 1

[0105] A lubricating oil, the difference between this comparative application example and application example 1 is that the extreme pressure anti-wear self-repairing lubricating oil additive is prepared by comparative example 1, and the dosage of other components and the preparation method are the same as those in application example 1.

[0106] Comparative Application Example 2

[0107] A lubricating oil, the difference between this comparative application example and application example 1 is that the extreme pressure anti-wear self-repairing lubricating oil additive is prepared by comparative example 2, and the dosage of other components and the preparation method are the same as those in application example 1.

[0108] Comparative Application Example 3

[0109] A lubricating oil, the difference between this comparative application example and application example 1 is that the extreme pressure anti-wear self-repairing lubricating oil additive is prepared by comparative example 3, and the dosage of other components and the preparation method are the same as those in application example 1.

[0110] Test case

[0111] Performance tests were conducted on the corresponding use cases 1-3 and the comparison application examples 1-3.

[0112] Test method:

[0113] Load-bearing capacity: Tested in accordance with GB / T 3142-2019;

[0114] Corrosion resistance: Tested according to GB / T 5096-2017;

[0115] Wear scar diameter: Refer to SH / T 0189-2017 and test under test condition A.

[0116] The test results are shown in Table 1.

[0117] Table 1 Performance Test Results

[0118]

[0119] The test results above show that the extreme pressure anti-wear self-repairing lubricating oil additive prepared in this invention exhibits excellent load-bearing capacity, good corrosion resistance, and a small wear scar diameter when applied to lubricating oil, indicating that this invention possesses excellent extreme pressure anti-wear self-repairing capabilities. In contrast, Comparative Example 1 lacked nano-silica loading, Comparative Example 2 lacked borate grafting, and Comparative Example 3 lacked free radical polymerization, resulting in varying degrees of decrease in its load-bearing capacity, corrosion resistance, and wear scar diameter.

[0120] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

[0121] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An extreme pressure anti-wear self-repairing lubricating oil additive, characterized in that, The extreme pressure anti-wear self-healing lubricating oil additive is composed of the following components in parts by weight: 5-15 parts of modified graphene oxide 30-50 parts antioxidant 10-30 parts of anti-wear agent Extreme pressure agent 10-30 parts; in, The modified graphene oxide is obtained by reacting carboxylated graphene oxide loaded with nano-silica with linoleamide borate, and then copolymerizing it with acrylate. The preparation method of the extreme pressure anti-wear self-repairing lubricating oil additive includes the following steps: S1. Graphene oxide and tetraethoxysilane are blended and reacted under alkaline conditions to obtain graphene oxide loaded with nano-silica; silane coupling agent KH550 and succinic anhydride are blended and reacted under stirring, and then the graphene oxide loaded with nano-silica is added and the reaction is continued under stirring to obtain carboxylated graphene oxide loaded with nano-silica. S2. Boric acid and diethanolamine are mixed and heated and stirred to obtain an intermediate; the intermediate is mixed with linoleic acid, a catalyst is added, and the mixture is heated to obtain linoleamide borate ester. S3. The carboxylated graphene oxide supported on nano-silica and linoleamide borate are blended, a catalyst is added, and the mixture is heated to obtain an intermediate product; the intermediate product is blended with acrylate, an initiator is added, and the mixture is heated to obtain modified graphene oxide. S4. Mix all components evenly to obtain extreme pressure anti-wear self-repairing lubricating oil additive.

2. The extreme pressure anti-wear self-repairing lubricating oil additive according to claim 1, characterized in that, The antioxidant is selected from one or more of 2,6-di-tert-butyl-p-cresol, 2,4,6-tri-tert-butylphenol, or 2,6-di-tert-butyl-4-nonylphenol.

3. The extreme pressure anti-wear self-repairing lubricating oil additive according to claim 1, characterized in that, The anti-wear agent is selected from one or more of phosphate ester derivatives, organosulfur and phosphorus compounds, amine phosphates, or polyphosphoric acid.

4. The extreme pressure anti-wear self-repairing lubricating oil additive according to claim 1, characterized in that, The extreme pressure agent is selected from one or more of sulfurized olefins, sulfurized fatty acids, or sulfurized fatty acid esters.

5. The extreme pressure anti-wear self-repairing lubricating oil additive according to claim 1, characterized in that, In step S1, the mass ratio of graphene oxide to tetraethoxysilane is 1:(5-15); the mass ratio of graphene oxide loaded with nano-silica, silane coupling agent KH550 and succinic anhydride is 1:(0.01-0.5):(0.01-0.5).

6. The extreme pressure anti-wear self-repairing lubricating oil additive according to claim 1, characterized in that, In step S2, the molar ratio of boric acid to diethanolamine is 1:(2-3); the molar ratio of the intermediate to linoleic acid is 1:(0.5-0.9).

7. The extreme pressure anti-wear self-repairing lubricating oil additive according to claim 1, characterized in that, In step S3, the molar ratio of the carboxylated supported nano-silica graphene oxide to linoleamide borate is 1:(0.5-1.5); the molar ratio of the intermediate product to acrylate is 1:(0.1-1).

8. The application of the extreme pressure anti-wear self-healing lubricating oil additive according to any one of claims 1-7 in lubricating oil, characterized in that, The lubricating oil comprises the following components in parts by weight: 80-100 parts base oil Extreme pressure anti-wear self-healing lubricant additive 5-15 parts 1-5 parts of modified molybdenum disulfide 8-40 parts of auxiliary agent; in, The modified molybdenum disulfide is obtained by reacting hydroxylated molybdenum disulfide with polyacrylic acid.

9. The application of the extreme pressure anti-wear self-repairing lubricating oil additive according to claim 8 in lubricating oil, characterized in that, The preparation method of the modified molybdenum disulfide includes the following steps: Molybdenum disulfide and mercaptoethanol were blended, sonicated, and then freeze-dried to obtain hydroxylated molybdenum disulfide; the hydroxylated molybdenum disulfide was blended with polyacrylic acid and heated to react to obtain polyacrylic acid modified molybdenum disulfide.

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