An industrial lubricating oil extreme pressure anti-wear agent containing self-healing materials and its preparation method

Abstract

This invention belongs to the field of lubricant additive technology and provides an industrial lubricant extreme pressure anti-wear agent containing self-healing materials and its preparation method. First, a solution containing multi-metal complexes and a phosphate precursor solution are prepared. Through the synergistic effect of the multi-metal compounds, an active component with anti-wear properties is formed. This is introduced into a phosphate system, where the multi-metal complex solution and the phosphate precursor solution are mixed to form a core phase. A shell phase is formed using a resin precursor and a modifier. Further emulsification prepares a microcapsule structure containing multi-metal and phosphate components, releasing active substances under operating conditions to reduce friction and wear. Subsequently, MOF materials are functionalized to acquire anti-wear properties. By introducing modifiers and composite components containing multifunctional groups, a MOF composite material with lubrication-enhancing properties is prepared. Finally, the microcapsules are mixed with the functionalized MOF composite material to obtain an industrial lubricant extreme pressure anti-wear agent containing self-healing materials.

Description

Technical Field

[0001] This invention belongs to the field of lubricating oil additive technology, and relates to an industrial lubricating oil extreme pressure anti-wear agent containing self-healing materials and its preparation method. Background Technology

[0002] Industrial lubricants play a crucial role in modern industry, serving as the core guarantee for the normal operation of mechanical equipment. Their main functions are to reduce friction and wear between mechanical parts, extend equipment lifespan, and protect equipment's stable operation under harsh conditions such as high temperature, high pressure, heavy load, and high speed. However, relying solely on the basic lubricating properties of lubricants is insufficient to meet the demands of modern industry for high efficiency, long lifespan, and high reliability. Especially under extreme conditions, such as in gear transmission systems, bearings, hydraulic equipment, or metal processing scenarios, high loads, high temperatures, and high speeds can cause the lubricating oil film to rupture, leading to direct contact between metal surfaces and resulting in severe wear, seizing, or even equipment failure. Therefore, to further improve lubricant performance and meet the stringent requirements of industrial equipment, extreme pressure anti-wear agents have emerged as important functional additives for lubricants.

[0003] The essential function of extreme pressure (EPP) anti-wear agents is to impart anti-wear and anti-seize properties to lubricating oils under extreme operating conditions. They effectively reduce the coefficient of friction by forming a protective film on the metal surface, minimizing direct contact between mechanical parts and preventing wear and plastic deformation of the metal. Especially under high load conditions, when the lubricating oil film ruptures due to immense pressure, the EPP anti-wear agent interacts with the metal surface through physical adsorption or chemical reaction, generating a protective film with high shear strength, thus continuing to protect metal parts even if the lubricating oil fails. This protective film may consist of metal sulfides, phosphates, borides, or oxides, exhibiting high stability and low friction characteristics. This property makes EPP anti-wear agents an important component of high-load industrial equipment and metalworking fluids.

[0004] In practical applications, extreme pressure anti-wear agents are widely used in various lubricant products such as industrial gear oils, hydraulic oils, cutting fluids, and engine oils. For example, in gear transmission systems, extreme pressure anti-wear agents can effectively reduce wear at gear meshing points and improve gear transmission efficiency; in hydraulic equipment, they can extend equipment life and reduce operating costs; in the metal processing field, extreme pressure anti-wear agents can reduce friction between tools and workpieces, improve machining accuracy, and extend tool life. With the continuous advancement of industrial automation and equipment precision, the market demand for extreme pressure anti-wear agents continues to grow, placing higher demands on the performance of lubricants. Therefore, the research and development of extreme pressure anti-wear agents has significant industrial value. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide an extreme pressure anti-wear agent for industrial lubricating oils containing self-healing materials and its preparation method. Through the synergistic effect of multifunctional microencapsulation technology and metal-organic framework (MOF) composite materials, the anti-wear performance and high-temperature stability of lubricating oil are improved. First, microcapsules are prepared using emulsification technology with multimetal complexes and phosphate precursors. The core contains multimetallic active components, and the outer shell is coated with resin material to ensure its dispersibility and stability in the lubricating oil. Second, functionalized MOF materials are used, and by introducing active groups containing sulfur and phosphorus, as well as composite modifying components, MOF composite materials with enhanced lubrication and anti-wear properties are prepared. Finally, the microcapsules are mixed with the functionalized MOF composite materials to obtain the extreme pressure anti-wear agent, thereby meeting the needs of actual production.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] In a first aspect, the present invention provides a method for preparing an industrial lubricating oil extreme pressure anti-wear agent containing a self-healing material, the preparation method comprising:

[0008] A1. Ammonium molybdate is dispersed in the first part of deionized water, sodium tungstate is dispersed in the second part of deionized water, and cerium ammonium nitrate is dispersed in the third part of deionized water. The ammonium molybdate solution is added to the sodium tungstate solution, followed by the cerium ammonium nitrate solution. Citric acid is added to adjust the pH to 6 to obtain a multi-metal complex solution.

[0009] A2, dispersing phosphoric acid and boric acid in deionized water, adjusting the temperature to 60℃ and stirring to obtain a phosphate solution, then dispersing boron nitride in anhydrous ethanol and adding it to the phosphate solution, adjusting the pH to 7 to obtain the phosphate precursor;

[0010] S1, a multi-metal complex solution, phosphate precursor, butylated hydroxytoluene and isopropanol are mixed, the temperature is adjusted to the first temperature and stirred to obtain the core phase solution. Urea and formaldehyde solutions are dispersed in deionized water, the pH is adjusted to 7, heated to 70°C, benzaldehyde oxime is added and stirred to obtain urea-formaldehyde resin precursor. Urea-formaldehyde resin precursor and melamine-formaldehyde resin are dispersed in deionized water, 1% ammonium chloride solution is added and the pH is adjusted to 4.5 to obtain the shell phase solution. The core phase solution, shell phase solution and emulsifier are then mixed, the temperature is adjusted to the second temperature and stirred, centrifuged, washed and vacuum dried to obtain microcapsules.

[0011] S2, MOF is kept at a third temperature to obtain activated MOF. The activated MOF and 1,2-ethylenedithiol are dispersed in the first part of DMF. After standing at room temperature, it is centrifuged and dried to obtain the anti-wear component MOF. 1-Ethyl-3-methylimidazoline bis(trifluoromethylsulfonyl)imide, bismaleimide and ammonium persulfate are dispersed in the second part of DMF. After mixing evenly, the anti-wear component MOF is added. The temperature is adjusted to the second temperature under a nitrogen atmosphere and stirred. Zinc ion solution is added and stirring is continued. After the reaction is completed, it is centrifuged, washed and dried to obtain MOF@PIL composite powder. Microcapsules are mixed with MOF@PIL composite powder to obtain an industrial lubricating oil extreme pressure anti-wear agent containing self-healing materials.

[0012] Ammonium molybdate and sodium tungstate are the core precursor materials in this invention, which, upon dissolution, form molybdate and tungstate anions, respectively. These anions are the basic building blocks of polyoxometalate clusters. Molybdenum and tungsten, as transition metals in the same group, have highly similar chemical properties, particularly their ability to aggregate through oxygen bridges in solution to form complex polyoxometalate clusters. The formation of these clusters is a dynamic chemical process. By adjusting the pH of the system to 6, a weakly acidic environment is provided. This environment both inhibits the dissociation of polyoxometalate clusters and promotes their polymerization, thus ensuring that molybdate and tungstate anions can form stable polyoxometalate clusters. The oxide framework of polyoxometalate clusters possesses very high thermal stability, which is the basis for their function in extreme pressure wear-resistant lubricants. Extreme pressure environments are typically accompanied by high temperature and pressure; at local contact points on metal surfaces, the temperature can instantly rise to several hundred degrees Celsius or even higher. Under such extreme conditions, most organic lubricants undergo thermal decomposition or oxidation. However, the oxide skeleton of polyoxometalate clusters, due to the energy of their strong MO bonds (M being molybdenum or tungsten) and the stability of their bridging oxygen structures, can withstand these extreme conditions well, ensuring the continued function of the lubricant. Furthermore, the oxygen cluster structure of polyoxometalate clusters provides abundant active oxygen sites, especially bridging oxygen and surface boundary oxygen. These active oxygens can chemically adsorb onto the metal surface under frictional conditions, forming an anti-wear protective film. The formation mechanism of this lubricating film is multifaceted: firstly, polyoxometalate clusters adhere to the metal surface through physical adsorption or chemical bonding, forming a boundary lubricating film; secondly, under the influence of friction and high temperature, some metal oxides in the oxygen clusters react chemically with the metal surface to generate an in-situ metal oxide film, which possesses high hardness and lubrication performance. In addition, the unique molecular structure of polyoxometalate clusters gives them a certain degree of dynamic adaptability. When the lubricating film is damaged under shear stress, the oxygen clusters can reform a new protective film through intermolecular rearrangement, achieving a self-repair function. This self-repairing property is particularly crucial in extreme pressure and wear-resistant environments, significantly extending the service life of the lubricant.

[0013] The addition of cerium ammonium nitrate further optimizes the chemical and lubricating properties of the polymetallic oxo cluster. Cerium ammonium nitrate is a cerium-containing oxidant, its oxidizing power derived from the unique redox properties of cerium ions. Cerium ions can interact with molybdate or tungstate ions to form a cerium-containing polymetallic oxo cluster composite structure. The presence of this composite oxo cluster improves its chemical stability and adsorption capacity. During friction, cerium ions can capture or release oxygen free radicals through redox cycles, acting as an antioxidant. Oxygen free radicals are the main cause of lubricant degradation and metal surface oxidative damage in lubrication systems, and the presence of cerium ions can effectively neutralize these free radicals, thereby protecting the integrity of the lubricant and the stability of the metal surface. Furthermore, the introduction of cerium ions enhances the density and stability of the lubricating film. Through coordination with molybdate and tungstate ions, cerium ions form a denser composite film on the metal surface. This film not only exhibits excellent thermal stability but also maintains its integrity under high pressure conditions, significantly reducing contact stress on the metal surface and extending the life of the lubricating film. Citric acid, as a tricarboxylic acid molecule, forms polydentate coordination with molybdenum, tungsten, and cerium ions in polyoxometalate clusters through its carboxyl and hydroxyl groups. The introduction of citric acid further stabilizes the structure of the oxygen clusters, preventing dissociation or precipitation in aqueous solutions. The polydentate coordination of citric acid enables the formation of more stable complexes of the polyoxometalate clusters, which adhere better to metal surfaces under frictional conditions, forming an anti-wear protective film. Furthermore, the carboxyl and hydroxyl groups of citric acid can be released and activated during friction, further enhancing the shear resistance of the lubricating film. Citric acid also has a buffering effect, maintaining the system in a weakly acidic range by adjusting the pH of the solution, thereby promoting the stabilization and uniform dispersion of the polyoxometalate clusters.

[0014] In the preparation of phosphate precursors, the synergistic effect of phosphoric acid and boric acid is key to achieving high-performance lubricating films. Phosphate is a highly chemically active anion that can react with metal surfaces under frictional conditions to generate an anti-wear phosphate lubricating film in situ. This lubricating film exhibits significantly high load stability and can maintain its integrity under high pressure, thereby effectively reducing contact stress on the metal surface. Another key characteristic of phosphate films is their self-healing ability. Under high shear forces, the lubricating film may crack or wear, but phosphate ions in the system can be re-adsorbed onto the metal surface, repairing the damaged film and thus extending the effective service life of the lubricant.

[0015] Boric acid exists in solution as B(OH)3, and its unique chemical properties make it an important component in lubrication systems. Boric acid molecules can reduce friction by forming slip planes (similar to a layered structure), which act as solid lubricants between friction surfaces, reducing the coefficient of friction. Furthermore, the synergistic effect of boric acid and phosphoric acid can generate a denser, more wear-resistant composite lubricating film. The combination of phosphoric acid and boric acid not only improves the shear resistance of the lubricating film but also enhances its thermal stability, allowing it to remain stable under extreme pressure conditions. Boric acid also has a certain adsorption capacity; its molecules can form weak chemical bonds or hydrogen bonds with metal surfaces, further enhancing the adhesion of the lubricating film. Boron nitride, as a layered two-dimensional material, has significant advantages in lubrication systems due to its chemical and physical properties. Boron nitride's layered structure is similar to graphite, but its chemical stability is higher, thus maintaining its integrity under more severe friction conditions. In lubrication systems, the layered structure of boron nitride can form a low-friction slip layer on the metal surface. This slip layer can significantly reduce the coefficient of friction under high pressure conditions, reducing direct contact between metal surfaces. Furthermore, boron nitride can adsorb phosphates on its surface, which further enhances the shear resistance of the lubricating material. Boron nitride also exhibits excellent high-temperature stability, maintaining its structural integrity under extreme pressure environments and not failing due to thermal decomposition or chemical degradation.

[0016] The core phase solution mainly comprises multi-metal complexes and phosphate precursors, which are crucial for providing a lubricating film and anti-wear protection in the lubrication system. The multi-metal complexes, through their redox properties and the chemisorption of oxygen clusters, provide an antioxidant and lubricating protective film to the friction surface. The phosphate precursors, on the other hand, can chemically react with the metal surface to generate a self-healing wear-resistant film. Butylated hydroxytoluene (BHT), a commonly used antioxidant, is also added to the core components to prevent oxidative degradation under high temperature and pressure conditions, thus extending the effective service life of the lubricant. The outer shell phase solution encapsulates and protects the core while enabling the controlled release of the core components. The main components of the outer shell solution are urea-formaldehyde resin and melamine-formaldehyde resin. These two cross-linked polymers possess high mechanical strength and heat resistance, maintaining the integrity of the microcapsules under high pressure. Urea-formaldehyde resin exhibits good film-forming properties and chemical stability, making it suitable for use under high temperature and pressure conditions, while melamine-formaldehyde resin has higher hardness, enhancing the mechanical strength of the microcapsules and preventing premature rupture during storage or use. The combination of these two elements creates a shell material that combines flexibility and rigidity, ensuring the microcapsules can withstand extreme pressure environments. Emulsifiers play a crucial role in the microencapsulation process. By reducing the interfacial tension between the core and shell solutions, emulsifiers promote the formation of uniform droplet structures. Under heating conditions, the resin in the shell solution undergoes a cross-linking reaction, solidifies, and encapsulates the core. The resulting microcapsules can gradually release the core components during friction; this controlled release mechanism ensures that the lubricating film can be rapidly formed and repair wear under increased pressure and temperature. Simultaneously, microencapsulation technology extends the lubricant's service life because the core components are effectively protected during storage and use. Through the synergistic design of polyoxometalate clusters, phosphates, and boron nitride, multiple functions are provided for extreme pressure and wear-resistant environments, including the formation of a lubricating protective film, reduction of the coefficient of friction, and enhanced oxidation resistance. Furthermore, microencapsulation technology further optimizes the release behavior of these functional materials, ensuring the core components exert maximum effectiveness under frictional conditions.

[0017] MOFs (Metal-Organic Filaments) are a class of porous materials with high specific surface area, tunable pores, and abundant active sites. Their structure is formed by the self-assembly of metal ions or metal clusters with organic ligands through coordination bonds. After synthesis, unreacted organic ligands or solvent molecules often remain in the pores of MOFs. These residues hinder the exposure of active sites, reducing their chemical reactivity and lubrication properties. Therefore, MOFs must undergo activation treatment to release their potential functions. Activation of MOFs through heat treatment removes residual substances from the pores and exposes the surface metal centers and functional groups (such as carboxyl and hydroxyl groups). Activated MOFs exhibit significantly enhanced chemisorption capacity and higher specific surface area, and their porous structure provides an ideal carrier for lubrication design. The role of activated MOFs in lubrication systems is mainly reflected in two aspects. First, the exposed metal centers can chemically adsorb onto lubricant components or metal surfaces, forming a stable lubricating film and reducing wear at the frictional contact interface. Second, the open pore structure endows MOFs with high material storage capacity, enabling the loading of functional additives within the pores and providing ideal reaction space and bonding interfaces for subsequent chemical modification. Furthermore, the thermal stability of MOFs is further enhanced during activation, allowing them to maintain structural integrity and functional stability under harsh conditions such as high temperature and extreme pressure. After MOF activation, it is surface functionalized using 1,2-ethanedithiol. 1,2-ethanedithiol is a small molecule compound containing dithiol groups; its -SH groups can chemically bond with the metal centers on the MOF surface, generating surface-modified MOF materials. This modification process significantly enhances the anti-wear performance of MOFs. Thiol groups possess excellent interfacial lubrication properties, forming a chemically adsorbed film on the metal surface under frictional conditions, reducing direct contact between metals and thus lowering the coefficient of friction and wear rate. Furthermore, thiol groups may decompose at high temperatures to form metal sulfides, which further optimize the anti-wear properties of the material due to their excellent solid lubrication performance. Through surface modification, the lubrication function of MOF is significantly improved, and its surface chemical properties are also more diversified, providing a more stable and active bonding interface for subsequent composite with ionic liquids.

[0018] In this invention, a polyionic liquid (PIL) was synthesized via a free radical polymerization reaction of 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide, bismaleimide, and ammonium persulfate. During this process, ammonium persulfate acts as a free radical initiator, decomposing to generate free radicals that initiate the polymerization of bismaleimide, forming a cross-linked polymer network. Simultaneously, the ionic liquid is embedded into the polymer backbone through electrostatic interactions. This structural design endows the polyionic liquid with excellent lubrication properties and thermal stability. The low shear viscosity and polarity of the ionic liquid enable it to form a dense lubricating film on friction surfaces, significantly reducing the coefficient of friction. Furthermore, the high-temperature resistance and oxidation resistance of the ionic liquid ensure the stability of the lubrication system under extreme conditions. After the polyionic liquid is synthesized, it is composited with functionalized MOFs to form MOF@PIL composite powder. The core of this composite process lies in the effective filling and bonding of the polyionic liquid to the surface and pores of the MOF. PIL molecules are loaded onto the MOF surface and pores through interactions such as electrostatic adsorption, hydrogen bonding, and chemical bonding. This loading not only enhances the lubrication performance of the MOF but also further optimizes the interfacial chemistry of the composite material through the fluidity and polarity of the polyionic liquid. The high specific surface area and porous structure of the MOF provide ideal physical support for the dispersion of the polyionic liquid, while the lubrication properties of the polyionic liquid compensate for the shortcomings of the MOF in tribological performance. The combination of the two achieves synergistic enhancement of lubrication function. In the final optimization stage of the composite material, zinc ions were added to further improve its lubrication performance. As a functional additive, zinc ions can coordinate with imidazole cations in the polyionic liquid and active sites on the MOF surface to form stable zinc complexes. These complexes react with the metal surface under frictional conditions to generate zinc phosphide or zinc oxide lubricating films. These lubricating films significantly improve the wear resistance of the composite material due to their high hardness and high chemical stability. In addition, the zinc phosphide film exhibits excellent wear resistance under high pressure conditions, effectively dispersing frictional stress and reducing local damage to the metal surface.

[0019] The functional optimization of MOF@PIL composite powder is not only reflected at the microscopic level of material design, but also demonstrates a significant synergistic effect in its actual performance under friction conditions. During friction, PIL, through its fluidity and lubrication properties, forms a dense lubricating film on the metal surface, reducing shear stress and friction coefficient at the friction interface. Simultaneously, MOF, due to its surface active sites and porous structure, can capture oxygen free radicals generated at the friction interface, inhibiting oxidation reactions from damaging the lubricating film. Furthermore, the high mechanical strength and chemical stability of MOF ensure the structural integrity of the lubricating film under high-pressure environments, while the dynamic lubrication properties of polyionic liquids further enhance the self-healing ability of the lubricating film. This multi-layered synergistic effect enables MOF@PIL composite materials to exhibit excellent performance under extreme pressure and wear-resistant environments. Combined with microencapsulation technology, MOF@PIL composite powder works synergistically with other lubricating additives to further improve the overall performance of the lubricant. Microcapsules can delay the release of active components, ensuring the stability of the lubricant during long-term use. MOF@PIL, as the functional core component, provides continuous lubrication protection at the friction interface. Through the synergistic effect of polyoxometalate clusters, phosphates, and MOF@PIL, the lubricant forms a multi-layered protective film on the friction surface.

[0020] This invention enhances the overall performance of the lubricant through the interaction of various materials and functional components. Firstly, the synergistic effect of polyoxometalate clusters (POCs) on the metal surface is crucial. POCs are highly polymeric oxides composed of molybdate or tungstate units linked by oxygen bridges, exhibiting highly active chemical properties, particularly demonstrating excellent thermal stability and chemical reactivity under extreme friction conditions. During friction, POCs adhere to the metal surface through chemisorption, undergoing interfacial reactions with metal atoms to form a dense metal oxide film. This oxide film has high hardness, effectively withstanding frictional loads while reducing direct metal-to-metal contact, thus reducing wear. However, the function of POCs is not singular; their synergistic effect with other components significantly enhances the stability and efficiency of this process. The introduction of cerium ammonium nitrate provides important chemical support for the lubricating performance of POCs. Cerium ions, through their unique redox properties, interact with POCs at the friction interface. Cerium ions can capture oxygen free radicals generated during friction, thereby inhibiting oxidation reactions from damaging the lubricating film. This not only protects the structural integrity of the POCs but also further enhances the chemical stability of the lubricating film. Furthermore, cerium ions react with the metal surface at the friction interface to form a cerium oxide film. This film, combined with the oxide film formed by polyoxometalate clusters, creates a multi-layered lubrication protection structure. The layered nature of the cerium oxide film further disperses frictional stress, improving the shear resistance and high-temperature resistance of the lubricating film. Polyoxometalate clusters also form an important synergistic effect with phosphate. Under frictional conditions, phosphate reacts with the metal surface to form an in-situ phosphate film, while the polyoxometalate clusters, through their highly reactive oxygen cluster structure, provide favorable conditions for the growth of the phosphate film. Specifically, the polyoxometalate clusters can capture highly reactive oxygen free radicals and metal ions at the friction interface, making the phosphate reaction more uniform. In addition, the combination of the chemical stability of the phosphate film and the hardness of the polyoxometalate cluster film effectively resists damage to the lubricating film under high pressure and high temperature environments. This composite protective film exhibits excellent shear resistance and self-healing capabilities. When the lubricating film is damaged, phosphate ions can be rapidly adsorbed onto the metal surface, filling the damaged area and maintaining the integrity of the lubricating film.

[0021] The combination of MOF and PIL in this invention is another key step in optimizing the lubrication system. MOF, with its high specific surface area, porous structure, and active sites, provides an ideal platform for loading PIL. After activation, the surface metal centers and ligand functional groups of MOF are exposed, exhibiting higher chemisorption and storage capabilities. During the composite process, PIL is loaded onto the surface and within the pores of MOF through electrostatic interactions, hydrogen bonds, and chemical bonds, forming a stable composite structure. This composite design significantly improves the stability and dynamic lubrication performance of the lubricating film. During friction, PIL plays a crucial lubrication role. The ionic liquid component in PIL can form a dense lubricating film on the friction surface, reducing shear stress at the friction interface. MOF, on the other hand, performs the functions of storage and interface protection. Its pores can capture oxygen free radicals generated during friction, inhibiting oxidation reactions from damaging the lubricating film. Simultaneously, MOF, with its high strength and chemical stability, provides additional mechanical support for the lubricating film. The fluidity and dynamic lubrication properties of PIL allow it to continuously cover the friction surface under frictional heat. Combined with the chemisorption capacity of MOF, this ensures the integrity of the lubricating film under high pressure conditions. This synergistic effect achieves multi-level optimization of the lubricating film function, not only reducing the coefficient of friction but also extending the service life of the lubricant.

[0022] Thiol-modified MOFs further enhance their lubrication performance. The MOF surface was chemically modified with 1,2-ethanedithiol to impart dithiol groups. This modification enhances the interfacial lubrication properties of the MOF. Under frictional conditions, the thiol groups can chemically adsorb onto the metal surface, forming a stable interfacial film. This adsorbed film effectively reduces direct metal-to-metal contact and lowers the wear rate. Furthermore, at high temperatures, the thiol groups may decompose to form a metal sulfide film. This sulfide film, with its excellent solid lubrication properties, further optimizes the anti-wear characteristics of the lubricating film. The thiol groups also form an important interfacial synergistic effect with the PIL (particulate liquid). The imidazole cations in the PIL can bind to the polar portion of the thiol groups through electrostatic interactions, enhancing the interfacial bonding strength between the MOF and the PIL. Under frictional heat, the thiol groups may also react with the ionic liquid components to generate an additional lubricating film. This interfacial reaction exhibits strong shear resistance under extreme pressure conditions, enabling the lubricating film to withstand higher frictional loads. The introduction of zinc ions in the experimental design further optimized the performance of the lubricating film. Zinc ions can coordinate with functional groups in PIL and MOF to form stable zinc complexes. These complexes react chemically with the metal surface under frictional conditions to form zinc phosphide or zinc oxide films. These films significantly enhance the anti-wear ability of the lubricating film due to their high hardness and high-temperature resistance. Furthermore, zinc phosphide films exhibit excellent wear resistance under high pressure, effectively dispersing frictional stress and reducing localized damage to the metal surface. Zinc ions also form complex synergistic effects with polyoxometalates and phosphates, further improving the stability and chemical protection of the lubricating film.

[0023] As a preferred technical solution of the present invention, in step A1, the mass-to-volume ratio of the ammonium molybdate to the first deionized water is 17g:60mL.

[0024] In some optional embodiments, the mass-to-volume ratio of the sodium tungstate to the second portion of deionized water is 13 g: 40 mL;

[0025] In some optional embodiments, the mass-to-volume ratio of the cerium ammonium nitrate to the third part of deionized water is 1 g: 4 mL;

[0026] In some optional embodiments, the mass ratio of ammonium molybdate, sodium tungstate, cerium ammonium nitrate, and citric acid is 17:13:10:4.

[0027] In a preferred embodiment of the present invention, in step A2, the mass ratio of phosphoric acid, boric acid and boron nitride is 50:5:1.

[0028] In some optional embodiments, the mass ratio of boric acid to deionized water is 1:30;

[0029] In some optional embodiments, the mass ratio of boron nitride to anhydrous ethanol is 1:15.

[0030] As a preferred technical solution of the present invention, in step S1, the mass ratio of the multi-metal complex solution, phosphate precursor, butylated hydroxytoluene and isopropanol is 300:150:1:50.

[0031] In some alternative embodiments, the first temperature is 40-50°C, for example, it can be 40°C, 41°C, 42°C, 43°C, 44°C, 45°C, 46°C, 47°C, 48°C, 49°C or 50°C, but is not limited to the listed values, other unlisted values ​​within this temperature range are also applicable.

[0032] The stirring time at the first temperature is 30-40 minutes, for example, it can be 30 minutes, 31 minutes, 32 minutes, 33 minutes, 34 minutes, 35 minutes, 36 minutes, 37 minutes, 38 minutes, 39 minutes or 40 minutes, but it is not limited to the listed time. Other unlisted times within this time range are also applicable.

[0033] In some optional embodiments, the mass-to-volume ratio of urea, formaldehyde solution, deionized water and benzaldehyde oxime is 30g:45mL:100mL:1g.

[0034] In some optional embodiments, the mass ratio of the urea-formaldehyde resin precursor, melamine-formaldehyde resin, and deionized water is 4:1:6;

[0035] In some optional embodiments, the mass ratio of the core phase solution, the shell phase solution, and the emulsifier is 100:100:1;

[0036] In some optional embodiments, the emulsifier is Tween-20;

[0037] In some alternative embodiments, the second temperature is 60-70°C, for example, it can be 60°C, 61°C, 62°C, 63°C, 64°C, 65°C, 66°C, 67°C, 68°C, 69°C or 70°C, but is not limited to the listed values, other unlisted values ​​within this temperature range are also applicable.

[0038] The stirring time at the second temperature is 1-2 hours, for example, it can be 1 hour, 1.1 hours, 1.2 hours, 1.3 hours, 1.4 hours, 1.5 hours, 1.6 hours, 1.7 hours, 1.8 hours, 1.9 hours or 2 hours, but it is not limited to the listed times. Other unlisted times within this time range are also applicable.

[0039] In a preferred embodiment of the present invention, in step S2, the MOF is ZIF-8;

[0040] In some alternative embodiments, the third temperature is 200-250°C, for example, it can be 200°C, 205°C, 210°C, 215°C, 220°C, 225°C, 230°C, 235°C, 240°C, 245°C or 250°C, but is not limited to the listed values, other unlisted values ​​within this temperature range are also applicable.

[0041] In some optional embodiments, the third temperature holding time is 5-6 hours, for example, it can be 5.0 hours, 5.1 hours, 5.2 hours, 5.3 hours, 5.4 hours, 5.5 hours, 5.6 hours, 5.7 hours, 5.8 hours, 5.9 hours or 6.0 hours, but it is not limited to the listed times. Other unlisted times within this time range are also applicable.

[0042] In some optional embodiments, the activated MOF to 1,2-ethylenedithiol mass ratio is 20:3;

[0043] In some optional embodiments, the mass-to-volume ratio of the activated MOF to the first DMF is 20 g: 10 mL;

[0044] In some optional embodiments, the room temperature settling time is 6-8 hours, for example, 6 hours, 6.2 hours, 6.4 hours, 6.6 hours, 6.8 hours, 7 hours, 7.2 hours, 7.4 hours, 7.6 hours, 7.8 hours or 8 hours, but is not limited to the listed times; other unlisted times within this time range are also applicable.

[0045] In some optional embodiments, the mass ratio of 1-ethyl-3-methylimidazoline bis(trifluoromethylsulfonyl)imide, bismaleimide, ammonium persulfate, and the anti-wear component MOF is 12:4:1:40;

[0046] In some optional embodiments, the mass-to-volume ratio of the 1-ethyl-3-methylimidazoline bis(trifluoromethylsulfonyl)imide to the second part of DMF is 1 g: 5 mL;

[0047] The stirring time at the second temperature is 2-3 hours, for example, it can be 2 hours, 2.1 hours, 2.2 hours, 2.3 hours, 2.4 hours, 2.5 hours, 2.6 hours, 2.7 hours, 2.8 hours, 2.9 hours or 3 hours, but it is not limited to the listed times. Other unlisted times within this time range are also applicable.

[0048] In some optional embodiments, the mass-to-volume ratio of the bismaleimide to the zinc ion solution is 2 g: 1 mL;

[0049] The continued stirring time is 1-2 hours, for example, it can be 1 hour, 1.1 hours, 1.2 hours, 1.3 hours, 1.4 hours, 1.5 hours, 1.6 hours, 1.7 hours, 1.8 hours, 1.9 hours or 2 hours, but it is not limited to the listed time. Other unlisted times within this time range are also applicable.

[0050] In some optional embodiments, the mass ratio of the microcapsules to the MOF@PIL composite powder is 2:1.

[0051] In a second aspect, the present invention provides an industrial lubricating oil extreme pressure anti-wear agent containing self-healing materials, prepared by the preparation method described in the first aspect.

[0052] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) By microencapsulation technology, multi-metal complexes and phosphate precursors are encapsulated in a resin shell to form a stable core-shell structure. The microcapsule shell is composed of urea-formaldehyde resin and melamine-formaldehyde resin, which has good chemical inertness and mechanical strength. It can be stably dispersed in lubricating oil for a long time. Under friction contact or high temperature and high pressure conditions, it can gradually release the active components in the core to generate a chemical reaction film on the metal surface, reduce the friction coefficient, and enhance the anti-wear performance; (2) The MOF composite material significantly improves the chemical reactivity and thermal stability of the anti-wear components through the sulfurization modification of 1,2-ethylenedithiol and the introduction of ionic liquid. The sulfurization modification process introduces active sulfur groups, which can react with metals at high temperatures. Surface reaction generates a dense metal sulfide protective film, thereby reducing direct contact between metals. In addition, the addition of ionic liquid gives MOF material excellent lubrication performance and thermal stability, which can maintain the integrity of the lubricating oil film under high temperature conditions and further reduce the coefficient of friction. (3) By combining multifunctional microcapsules and MOF composite materials, multi-level synergistic effect is achieved to enhance the comprehensive performance of lubricating oil. Microcapsules provide controllable release of anti-wear components, while MOF composite materials have high specific surface area and multifunctional active sites, which can further improve anti-wear efficiency. During the friction process, the multi-metal complexes and phosphates released by microcapsules work together with the active components of MOF composite materials to form a multi-layer protective film on the metal surface, thereby providing anti-wear and anti-oxidation performance. Attached Figure Description

[0053] Figure 1 TEM image of the microcapsule provided in Embodiment 1 of the present invention;

[0054] Figure 2 This is a SEM image of the MOF@PIL composite powder provided in Example 1 of the present invention. Detailed Implementation

[0055] The technical solutions of the present invention will be described in detail below with reference to specific embodiments and accompanying drawings. The embodiments described herein are specific implementations of the present invention, used to illustrate the concept of the present invention; these descriptions are explanatory and exemplary, and should not be construed as limiting the implementation methods or the scope of protection of the present invention. In addition to the embodiments described herein, those skilled in the art can employ other obvious technical solutions based on the content disclosed in the claims and specification of this application. These technical solutions include any obvious substitutions and modifications made to the embodiments described herein.

[0056] The chemical reagents used in the embodiments and comparative examples of this invention are all commercially available products and have not undergone any further purification treatment.

[0057] Example 1

[0058] This embodiment provides an industrial lubricating oil extreme pressure anti-wear agent containing self-healing materials and its preparation method. The preparation method specifically includes the following steps:

[0059] A1. Disperse 17g of ammonium molybdate in 60mL of deionized water, 13g of sodium tungstate in 40mL of deionized water, and 10g of cerium ammonium nitrate in 40mL of deionized water. Add the ammonium molybdate solution to the sodium tungstate solution, then add the cerium ammonium nitrate solution, and add 4g of citric acid to adjust the pH to 6 to obtain a multi-metal complex solution.

[0060] A2, disperse 50g of phosphoric acid and 5g of boric acid in 150mL of deionized water, adjust the temperature to 60℃ and stir to obtain a phosphate solution, then disperse 1g of boron nitride in 15g of anhydrous ethanol and add it to the phosphate solution, adjust the pH to 7 to obtain the phosphate precursor.

[0061] S1. Mix 300g of a multi-metal complex solution, 150g of a phosphate precursor, 1g of butylated hydroxytoluene, and 50g of isopropanol. Adjust the temperature to 44℃ and stir for 31 min to obtain the core phase solution. Disperse 60g of urea and 90mL of 37wt.% formaldehyde solution in 200mL of deionized water. Adjust the pH to 7, heat to 70℃, add 2g of benzaldehyde oxime and stir to obtain a urea-formaldehyde resin precursor. Disperse 200g of the urea-formaldehyde resin precursor and 50g of melamine-formaldehyde resin in 300g of deionized water. Add 1% ammonium chloride solution to adjust the pH to 4.5 to obtain the outer shell phase solution. Mix the core phase solution, the outer shell phase solution, and an emulsifier. Adjust the temperature to 68℃ and stir for 1.6h. Centrifuge, wash, and vacuum dry to obtain microcapsules.

[0062] S2, MOF was kept at 210℃ for 5.5h to obtain activated MOF. 200g of activated MOF and 30g of 1,2-ethylenedithiol were dispersed in 100mL of DMF. After standing at room temperature, the mixture was centrifuged and dried to obtain the anti-wear component MOF. 60g of 1-ethyl-3-methylimidazoline bis(trifluoromethanesulfonyl)imide, 20g of bismaleimide and 5g of ammonium persulfate were dispersed in 300mL of DMF. After mixing evenly, 200g of the anti-wear component MOF was added. The temperature was adjusted to 62℃ under a nitrogen atmosphere and stirred for 2.1h. Then 10mL of 20wt.% zinc ion solution was added and stirring was continued for 1.2h. After the reaction was completed, the mixture was centrifuged, washed and dried to obtain MOF@PIL composite powder. 50g of microcapsules were mixed with 25g of MOF@PIL composite powder to obtain an industrial lubricant extreme pressure anti-wear agent containing self-healing materials.

[0063] Figure 1 The TEM image of the microcapsules prepared in this embodiment clearly shows the uniform spherical structure of the microcapsules, with a smooth surface and no obvious collapse. Figure 2 This is a SEM image of the MOF@PIL composite powder prepared in this embodiment.

[0064] Example 2

[0065] This embodiment provides an industrial lubricating oil extreme pressure anti-wear agent containing self-healing materials and its preparation method. The preparation method specifically includes the following steps:

[0066] A1. Disperse 17g of ammonium molybdate in 60mL of deionized water, 13g of sodium tungstate in 40mL of deionized water, and 10g of cerium ammonium nitrate in 40mL of deionized water. Add the ammonium molybdate solution to the sodium tungstate solution, then add the cerium ammonium nitrate solution, and add 4g of citric acid to adjust the pH to 6 to obtain a multi-metal complex solution.

[0067] A2, disperse 50g of phosphoric acid and 5g of boric acid in 150mL of deionized water, adjust the temperature to 60℃ and stir to obtain a phosphate solution, then disperse 1g of boron nitride in 15g of anhydrous ethanol and add it to the phosphate solution, adjust the pH to 7 to obtain the phosphate precursor.

[0068] S1. Mix 300g of a multi-metal complex solution, 150g of a phosphate precursor, 1g of butylated hydroxytoluene, and 50g of isopropanol. Adjust the temperature to 49℃ and stir for 38min to obtain the core phase solution. Disperse 60g of urea and 90mL of 37wt.% formaldehyde solution in 200mL of deionized water. Adjust the pH to 7, heat to 70℃, add 2g of benzaldehyde oxime and stir to obtain a urea-formaldehyde resin precursor. Disperse 200g of the urea-formaldehyde resin precursor and 50g of melamine-formaldehyde resin in 300g of deionized water. Add 1% ammonium chloride solution to adjust the pH to 4.5 to obtain the outer shell phase solution. Mix the core phase solution, the outer shell phase solution, and an emulsifier. Adjust the temperature to 61℃ and stir for 1.1h. Centrifuge, wash, and vacuum dry to obtain microcapsules.

[0069] S2, MOF was kept at 240℃ for 5.1h to obtain activated MOF. 200g of activated MOF and 30g of 1,2-ethylenedithiol were dispersed in 100mL of DMF. After standing at room temperature, the mixture was centrifuged and dried to obtain the anti-wear component MOF. 60g of 1-ethyl-3-methylimidazoline bis(trifluoromethanesulfonyl)imide, 20g of bismaleimide and 5g of ammonium persulfate were dispersed in 300mL of DMF. After mixing evenly, 200g of the anti-wear component MOF was added. The temperature was adjusted to 67℃ under a nitrogen atmosphere and stirred for 2.8h. Then 10mL of 20wt.% zinc ion solution was added and stirring was continued for 1.9h. After the reaction was completed, the mixture was centrifuged, washed and dried to obtain MOF@PIL composite powder. 50g of microcapsules were mixed with 25g of MOF@PIL composite powder to obtain an industrial lubricant extreme pressure anti-wear agent containing self-healing materials.

[0070] Example 3

[0071] This embodiment provides an industrial lubricating oil extreme pressure anti-wear agent containing self-healing materials and its preparation method. The preparation method specifically includes the following steps:

[0072] A1. Disperse 17g of ammonium molybdate in 60mL of deionized water, 13g of sodium tungstate in 40mL of deionized water, and 10g of cerium ammonium nitrate in 40mL of deionized water. Add the ammonium molybdate solution to the sodium tungstate solution, then add the cerium ammonium nitrate solution, and add 4g of citric acid to adjust the pH to 6 to obtain a multi-metal complex solution.

[0073] A2, disperse 50g of phosphoric acid and 5g of boric acid in 150mL of deionized water, adjust the temperature to 60℃ and stir to obtain a phosphate solution, then disperse 1g of boron nitride in 15g of anhydrous ethanol and add it to the phosphate solution, adjust the pH to 7 to obtain the phosphate precursor.

[0074] S1. Mix 300g of a multi-metal complex solution, 150g of a phosphate precursor, 1g of butylated hydroxytoluene, and 50g of isopropanol. Adjust the temperature to 41℃ and stir for 34min to obtain the core phase solution. Disperse 60g of urea and 90mL of 37wt.% formaldehyde solution in 200mL of deionized water. Adjust the pH to 7, heat to 70℃, add 2g of benzaldehyde oxime and stir to obtain a urea-formaldehyde resin precursor. Disperse 200g of the urea-formaldehyde resin precursor and 50g of melamine-formaldehyde resin in 300g of deionized water. Add 1% ammonium chloride solution to adjust the pH to 4.5 to obtain the outer shell phase solution. Mix the core phase solution, the outer shell phase solution, and an emulsifier. Adjust the temperature to 64℃ and stir for 1.4h. Centrifuge, wash, and vacuum dry to obtain microcapsules.

[0075] S2, MOF was kept at 250℃ for 5.8h to obtain activated MOF. 200g of activated MOF and 30g of 1,2-ethylenedithiol were dispersed in 100mL of DMF. After standing at room temperature, the mixture was centrifuged and dried to obtain the anti-wear component MOF. 60g of 1-ethyl-3-methylimidazoline bis(trifluoromethanesulfonyl)imide, 20g of bismaleimide and 5g of ammonium persulfate were dispersed in 300mL of DMF. After mixing evenly, 200g of the anti-wear component MOF was added. The temperature was adjusted to 61℃ under a nitrogen atmosphere and stirred for 2.4h. Then 10mL of 20wt.% zinc ion solution was added and stirring was continued for 1.4h. After the reaction was completed, the mixture was centrifuged, washed and dried to obtain MOF@PIL composite powder. 50g of microcapsules were mixed with 25g of MOF@PIL composite powder to obtain an industrial lubricant extreme pressure anti-wear agent containing self-healing materials.

[0076] Example 4

[0077] This embodiment provides an industrial lubricating oil extreme pressure anti-wear agent containing self-healing materials and its preparation method. The preparation method specifically includes the following steps:

[0078] A1. Disperse 17g of ammonium molybdate in 60mL of deionized water, 13g of sodium tungstate in 40mL of deionized water, and 10g of cerium ammonium nitrate in 40mL of deionized water. Add the ammonium molybdate solution to the sodium tungstate solution, then add the cerium ammonium nitrate solution, and add 4g of citric acid to adjust the pH to 6 to obtain a multi-metal complex solution.

[0079] A2, disperse 50g of phosphoric acid and 5g of boric acid in 150mL of deionized water, adjust the temperature to 60℃ and stir to obtain a phosphate solution, then disperse 1g of boron nitride in 15g of anhydrous ethanol and add it to the phosphate solution, adjust the pH to 7 to obtain the phosphate precursor.

[0080] S1. Mix 300g of a multi-metal complex solution, 150g of a phosphate precursor, 1g of butylated hydroxytoluene, and 50g of isopropanol. Adjust the temperature to 43℃ and stir for 36min to obtain the core phase solution. Disperse 60g of urea and 90mL of 37wt.% formaldehyde solution in 200mL of deionized water. Adjust the pH to 7, heat to 70℃, add 2g of benzaldehyde oxime and stir to obtain a urea-formaldehyde resin precursor. Disperse 200g of the urea-formaldehyde resin precursor and 50g of melamine-formaldehyde resin in 300g of deionized water. Add 1% ammonium chloride solution to adjust the pH to 4.5 to obtain the shell phase solution. Then mix the core phase solution, shell phase solution, and emulsifier. Adjust the temperature to 66℃ and stir for 1.9h. Centrifuge, wash, and vacuum dry to obtain microcapsules.

[0081] S2. MOF was kept at 220℃ for 5.3h to obtain activated MOF. 200g of activated MOF and 30g of 1,2-ethylenedithiol were dispersed in 100mL of DMF. After standing at room temperature, the mixture was centrifuged and dried to obtain the anti-wear component MOF. 60g of 1-ethyl-3-methylimidazoline bis(trifluoromethanesulfonyl)imide, 20g of bismaleimide and 5g of ammonium persulfate were dispersed in 300mL of DMF. After mixing evenly, 200g of the anti-wear component MOF was added. The temperature was adjusted to 69℃ under a nitrogen atmosphere and stirred for 2.7h. Then 10mL of 20wt.% zinc ion solution was added and stirring was continued for 1.6h. After the reaction was completed, the mixture was centrifuged, washed and dried to obtain MOF@PIL composite powder. 50g of microcapsules were mixed with 25g of MOF@PIL composite powder to obtain an industrial lubricant extreme pressure anti-wear agent containing self-healing materials.

[0082] Comparative Example 1

[0083] This comparative example provides an industrial lubricating oil extreme pressure anti-wear agent containing self-healing materials and its preparation method. The difference between this example and Example 1 is that the mass of 1,2-ethylenedithiol in S2 is 60g, which is 30g more than in Example 1. Other process parameters and operating conditions are exactly the same as in Example 1.

[0084] Comparative Example 2

[0085] This comparative example provides an industrial lubricating oil extreme pressure anti-wear agent containing self-healing materials and its preparation method. The difference between this example and Example 1 is that the mass of 1,2-ethylenedithiol in S2 is 5g, which is 25g less than that in Example 1. Other process parameters and operating conditions are exactly the same as those in Example 1.

[0086] Comparative Example 3

[0087] This comparative example provides an industrial lubricating oil extreme pressure anti-wear agent containing self-healing materials and its preparation method. The difference between this example and Example 1 is that the mass of 1-ethyl-3-methylimidazoline bis(trifluoromethanesulfonyl)imide in S2 is 120g, which is 60g more than in Example 1. Other process parameters and operating conditions are exactly the same as in Example 1.

[0088] Comparative Example 4

[0089] This comparative example provides an industrial lubricating oil extreme pressure anti-wear agent containing self-healing materials and its preparation method. The difference between this example and Example 1 is that the mass of 1-ethyl-3-methylimidazoline bis(trifluoromethanesulfonyl)imide in S2 is 10g, which is 50g less than that in Example 1. Other process parameters and operating conditions are exactly the same as those in Example 1.

[0090] The lubricating oil composition is: 80 parts base oil, 5 parts extreme pressure anti-wear agent, 0.5 parts dimethyl silicone oil, 1 part demulsifier D114, 2 parts sodium sulfonate, 3 parts succinimide, and 1 part alkylphenol calcium sulfate. The maximum non-seize load of the lubricating oil (P...) B ) and sintering load (P) D The test method is GB / T 3142-2019, and the test results are shown in Table 1.

[0091] Table 1. Test results of an extreme pressure anti-wear agent for industrial lubricating oil containing self-healing materials in Examples 1-4 and Comparative Examples 1-4.

[0092] Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 <![CDATA[P B (N)]]> 1320 1340 1360 1370 980 1050 1000 950 <![CDATA[P D (N)]]> 3650 3500 3700 3550 2200 2350 2750 2150

[0093] As shown in Table 1, compared to Example 1, both the maximum non-seizure load and sintering load of Comparative Example 1 and Comparative Example 2 decreased. 1,2-Ethylenedithiol undergoes chemisorption on the metal active sites of the MOF surface through its thiol groups, forming a stable thiol-modified layer. Thiol groups possess strong metalophilic properties and can chemisorb onto the metal surface at the friction contact interface, forming a chemisorption film. In Comparative Example 1, the excess of 1,2-ethylenedithiol may shield the metal active sites of the MOF surface, weakening the MOF's ability to capture oxygen free radicals or synergize with other additives. Furthermore, an excessively thick adsorption layer may exhibit uneven distribution at the friction interface, leading to localized rupture or peeling of the lubricating film under high pressure, reducing its effectiveness. In Comparative Example 2, the insufficient amount of 1,2-ethylenedithiol results in incomplete thiol modification, reducing the coverage of the chemisorption film at the friction interface. This prevents the lubricating oil from effectively reducing direct contact between metal surfaces, leading to a decrease in both the maximum non-seizure load and sintering load.

[0094] As shown in Table 1, compared to Example 1, both the maximum non-seize load and sintering load of Comparative Example 3 and Comparative Example 4 decreased. The imidazole cation and bis(trifluoromethanesulfonyl)imide in 1-ethyl-3-methylimidazoline bis(trifluoromethanesulfonyl)imide interact through electrostatic and hydrogen bonding to form a dense lubricating film on the friction surface. This lubricating film exhibits low shear viscosity and high thermal stability. In Comparative Example 3, an excess of 1-ethyl-3-methylimidazoline bis(trifluoromethanesulfonyl)imide resulted in reduced adhesion of the lubricating film. Under high pressure, the lubricating film might be difficult to stably adhere to the metal surface, making it easily damaged under shear force. In Comparative Example 4, an insufficient amount of 1-ethyl-3-methylimidazoline bis(trifluoromethanesulfonyl)imide led to uneven distribution of the lubricating film at the friction interface, increasing the direct contact area on the metal surface and decreasing the maximum non-seize load and sintering load.

[0095] The above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Those skilled in the art should understand that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention fall within the protection and disclosure scope of the present invention.

Claims

1. A method for preparing an industrial lubricating oil extreme pressure anti-wear agent containing self-healing materials, characterized in that, The preparation method includes: S1, mix the multi-metal complex solution, phosphate precursor, butylated hydroxytoluene and isopropanol to obtain the core phase solution, disperse the urea-formaldehyde resin precursor and melamine-formaldehyde resin in deionized water, adjust the pH to 4.5 to obtain the shell phase solution, and then mix the core phase solution, shell phase solution and emulsifier to obtain microcapsules; S2, MOF is kept at a certain temperature to obtain activated MOF. The activated MOF and 1,2-ethylenedithiol are dispersed in the first part of DMF to obtain anti-wear component MOF. 1-ethyl-3-methylimidazoline bis(trifluoromethanesulfonyl)imide, bismaleimide and ammonium persulfate are dispersed in the second part of DMF. Then, the anti-wear component MOF and zinc ion solution are added to obtain MOF@PIL composite powder. Microcapsules are mixed with MOF@PIL composite powder to obtain an industrial lubricating oil extreme pressure anti-wear agent containing self-healing materials. The method for preparing the multi-metal complex solution includes: dispersing ammonium molybdate in a first part of deionized water, dispersing sodium tungstate in a second part of deionized water, dispersing cerium ammonium nitrate in a third part of deionized water, adding the ammonium molybdate solution to the sodium tungstate solution, then adding the cerium ammonium nitrate solution, adding citric acid, adjusting the pH to 6, and obtaining the multi-metal complex solution. The method for preparing the phosphate precursor includes: dispersing phosphoric acid and boric acid in deionized water, adjusting the temperature to 60°C and stirring to obtain a phosphate solution, then dispersing boron nitride in anhydrous ethanol and adding it to the phosphate solution, adjusting the pH to 7, and obtaining the phosphate precursor. The preparation method of the urea-formaldehyde resin precursor includes: dispersing urea and formaldehyde solution in deionized water, adjusting the pH to 7, heating to 70°C, and adding benzaldehyde oxime to obtain the urea-formaldehyde resin precursor.

2. The method for preparing an industrial lubricating oil extreme pressure anti-wear agent containing self-healing materials according to claim 1, characterized in that, In S1, The mass ratio of the polymetallic complex solution, phosphate precursor, butylated hydroxytoluene and isopropanol is 300:150:1:

50. The mass ratio of the urea-formaldehyde resin precursor to the melamine-formaldehyde resin is 4:

1.

3. The method for preparing an industrial lubricating oil extreme pressure anti-wear agent containing self-healing materials according to claim 1, characterized in that, In S2, The mass ratio of the activated MOF to 1,2-ethylenedithiol is 20:3; The mass ratio of 1-ethyl-3-methylimidazoline bis(trifluoromethylsulfonyl)imide, bismaleimide, ammonium persulfate and the anti-wear component MOF is 12:4:1:40; The mass ratio of the microcapsules to the MOF@PIL composite powder is 2:

1.

4. The method for preparing an industrial lubricating oil extreme pressure anti-wear agent containing self-healing materials according to claim 1, characterized in that, The mass ratio of ammonium molybdate, sodium tungstate, cerium ammonium nitrate, and citric acid is 17:13:10:

4.

5. The method for preparing an industrial lubricating oil extreme pressure anti-wear agent containing self-healing materials according to claim 1, characterized in that, The mass ratio of phosphoric acid, boric acid and boron nitride is 50:5:

1.

6. The method for preparing an industrial lubricating oil extreme pressure anti-wear agent containing self-healing materials according to claim 1, characterized in that, The mass-to-volume ratio of urea, formaldehyde solution and benzaldehyde oxime is 30g:45mL:1g.

7. An industrial lubricating oil extreme pressure anti-wear agent containing self-healing materials is obtained by the preparation method according to any one of claims 1-6.

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