Metal organic framework modified lubricating material, preparation method thereof and solid lubricating coating

Abstract

The invention relates to a metal organic framework modified lubricating material, a preparation method thereof and a solid lubricating coating, and relates to the technical field of lubricating coatings. The lubricating material comprises a first metal organic framework layer, a two-dimensional layered material layer and a second metal organic framework layer which are sequentially stacked, the two-dimensional layered material layer comprises a two-dimensional layered material; each of the first metal organic framework layer and the second metal organic framework layer comprises a plurality of spherical metal organic framework materials, and the spherical metal organic framework materials are formed on the surface of the two-dimensional layered material layer. In the application process of the metal organic framework modified lubricating material provided by the invention, the friction coefficient can be greatly reduced, and the service life of the prepared lubricating coating is prolonged.

Description

Technical Field

[0001] The present disclosure relates to the technical field of lubricating coatings, and in particular to a metal organic framework modified lubricating material and a preparation method thereof, and a solid lubricating coating. Background Art

[0002] Friction and wear are the main causes of material failure and mechanical performance degradation. According to statistics, about 30% of the world's energy is consumed in friction. Therefore, reducing friction and wear is of great significance to improving the performance and reliability of mechanical equipment. However, traditional lubricating oil and grease systems have certain disadvantages in terms of lubrication failure, environmental adaptability, volatility, pollution and performance limitations. It is difficult to maintain stable lubrication performance under certain special working conditions (such as high temperature, high pressure, strong corrosion, etc.). For example, in the field of aerospace, high-temperature and high-speed bearings, gears, chains of spacecraft, launch vehicles, aircraft, etc., and pistons, piston rings and other components of engines are subject to alternating extreme environments of high / low temperature, dry / wet, strong radiation and atmosphere / vacuum, which place extremely high demands on lubricating materials. In the field of mechanical manufacturing, the lubrication of various mechanical parts, such as bolts, nuts, screws, lead screws, spline shafts, washers, gaskets and other fasteners, serve under harsh friction conditions such as high temperature, high load, and high speed, and require lubricants with high stability, good lubrication effect and strong wear resistance. In addition, many sliding parts with complex and changeable working conditions, as well as automobile engine bearings, pistons, locks, pins and other parts, generate heat due to friction, and the contact surface temperature increases significantly, which reduces the wear resistance of traditional lubricants and greases, making it difficult to achieve ideal lubrication effects.

[0003] Solid lubricating coatings can significantly reduce the friction coefficient and wear rate, thereby improving the performance and reliability of mechanical equipment. Applying solid lubricating coatings on key components such as engines, transmissions, and bearings can effectively reduce friction and wear, extend the service life of equipment, and reduce maintenance costs. In addition, solid lubricating coatings also have self-lubricating properties and can provide lubrication without an external lubrication source, further improving the reliability and stability of the equipment. At the same time, compared with traditional liquid lubricants, solid lubricating coatings have a lower degree of pollution and effectively reduce energy consumption. Therefore, the research and development of new solid lubricating coatings with excellent lubrication performance, high temperature resistance, wear resistance and other characteristics has become a current research hotspot.

[0004] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art and provide a metal-organic framework modified lubricating material and a preparation method thereof, and a solid lubricating coating. By using a metal-organic framework material to modify the two-dimensional layered material, the sliding friction in the friction process is converted into rolling friction, thereby greatly reducing the friction coefficient.

[0006] According to one aspect of the present disclosure, there is provided a metal organic framework modified lubricating material, comprising a first metal organic framework layer, a two-dimensional layered material layer, and a second metal organic framework layer stacked in sequence; The two-dimensional layered material layer comprises a two-dimensional layered material; The first metal organic framework layer and the second metal organic framework layer both include a plurality of spherical metal organic framework materials, and the spherical metal organic framework materials are both formed on the surface of the two-dimensional layered material layer.

[0007] In an exemplary embodiment of the present disclosure, the length dimension of the two-dimensional layered material is 3 to 5 μm; The particle size of the spherical metal organic framework material is 200-500nm.

[0008] According to another aspect of the present disclosure, a method for preparing the above-mentioned metal organic framework modified lubricating material is provided, comprising the following steps: S10, dispersing the two-dimensional layered material into an ethanol solution of a silane coupling agent for modification to obtain a modified two-dimensional layered material; Wherein, the mass ratio of the two-dimensional layered material to the silane coupling agent is (10-20):1; S20, mixing the modified two-dimensional layered material obtained in step S10 with nitrate and N,N-dimethylformamide to obtain a first mixed solution; Wherein, the molar ratio of the two-dimensional layered material to the nitrate is 10:(1-1.5); S30, adding N,N-dimethylformamide containing an organic ligand to the first mixed solution to obtain a second mixed solution; The molar ratio of organic ligand to nitrate is (1~2):1; S40, reacting the second mixed solution at 120-180° C. for 12-24 hours, filtering and drying to obtain a metal organic framework modified lubricating material.

[0009] In an exemplary embodiment of the present disclosure, in step S20, the nitrate is at least one of nickel nitrate hexahydrate, cobalt nitrate hexahydrate, and copper nitrate trihydrate; In step S30, the organic ligand is at least one of 3-indolecarboxylic acid and 1,3,5-benzenetricarboxylic acid.

[0010] In an exemplary embodiment of the present disclosure, in step S10, the mass percentage of the silane coupling agent in the ethanol solution of the silane coupling agent is 2-5%; The silane coupling agent is at least one of silane coupling agent KH550, silane coupling agent KH560 and silane coupling agent KH570.

[0011] In an exemplary embodiment of the present disclosure, in step S10, the two-dimensional layered material is at least one of molybdenum disulfide, tungsten disulfide, and graphene; The length dimension of the two-dimensional layered material is 3-5 μm.

[0012] In an exemplary embodiment of the present disclosure, in step S10, the two-dimensional layered material is tungsten disulfide, and the silane coupling agent is silane coupling agent KH550; the mass ratio of tungsten disulfide to silane coupling agent KH550 is 16.7:1; In step S20, the nitrate is nickel nitrate hexahydrate; the molar ratio of tungsten disulfide to nickel nitrate hexahydrate is 10:1.4; In step S30, the organic ligand is 3-indolecarboxylic acid, and the molar ratio of 3-indolecarboxylic acid to nickel nitrate hexahydrate is 2:1.

[0013] According to another aspect of the present disclosure, a solid lubricating coating is provided, which comprises, by weight, 15 to 25 parts of a composite binder, 3 to 5 parts of an additive, 35 to 50 parts of a solvent, and 20 to 35 parts of a metal organic framework modified lubricating material prepared by the above preparation method; The composite adhesive comprises acrylic modified epoxy resin and polyimide resin; The auxiliary agent includes one or more of a dispersant, a defoamer, a leveling agent, and an anti-settling agent.

[0014] In an exemplary embodiment of the present disclosure, in the composite adhesive, the mass ratio of the acrylic modified epoxy resin to the polyimide resin is 2:(1-1.5).

[0015] In an exemplary embodiment of the present disclosure, it further includes a wear-resistant filler; The wear-resistant filler is fibrous calcium sulfate, the whisker length of the fibrous calcium sulfate is 5-8 μm, and the whisker diameter is 0.5-2 μm.

[0016] The present invention uses a spherical metal organic framework material to modify a two-dimensional layered material, so that the metal organic framework modified lubricating material has a sandwich layered structure of a first metal organic framework layer / a two-dimensional layered material layer / a second metal organic framework layer. In this way, the spherical metal organic framework material in the metal organic framework layer can convert the sliding friction in the friction process into rolling friction, greatly reducing the friction coefficient.

[0017] The use of metal organic framework modified lubricating materials, supplemented with composite binders, additives, etc. to prepare solid lubricating coatings can significantly reduce the friction coefficient during the friction process. The test results of the embodiment show that the solid lubricating coating provided by the present disclosure is used to prepare a solid lubricating coating on the surface of bearing steel GCr15, and the average friction coefficient is reduced to 0.054~0.057, and the comprehensive friction coefficient is reduced by 60%.

[0018] The nanoparticle metal frame material worn during the friction process can be filled into the tiny defects formed on the friction surface to repair the friction surface, further increasing the lubrication effect and reducing the amount of wear. The solid lubricating coating provided by the present disclosure has high heat resistance, thereby improving the lubrication performance under extreme conditions such as high temperature and high pressure. The test results of the embodiment show that the mass wear of the solid lubricating coating is only about 12 mg, and the temperature resistance reaches 450°C.

[0019] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the specification are used to explain the principles of the present disclosure. Obviously, the accompanying drawings described below are only some embodiments of the present disclosure, and for ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0021] Figure 1 This is a schematic diagram of the structure of a metal organic framework modified lubricating material in one embodiment of the present disclosure.

[0022] Figure 2 The present invention is a schematic diagram of the preparation process of a metal organic framework modified lubricating material in one embodiment of the present invention.

[0023] Figure 3 This is a SEM image of the solid lubricating coating formed by the solid lubricating coating prepared in Example 1 of the present disclosure.

[0024] Figure 4 This is a SEM image of the solid lubricating coating formed by the solid lubricating coating prepared in Example 2 of the present disclosure.

[0025] Figure 5 Schematic diagram of the test results of the friction coefficient of the solid lubricating coating formed by the solid lubricating coating prepared in Example 1 of the present disclosure.

[0026] Figure 6Schematic diagram of the test results of the friction coefficient of the solid lubricating coating formed by the solid lubricating coating prepared in Example 2 of the present disclosure.

[0027] Figure 7 This is a schematic diagram of the test results of the friction coefficient of the solid lubricating coating formed by the solid lubricating coating prepared in Comparative Example 1 of the present disclosure.

[0028] The reference numerals are as follows: 10. First metal organic framework layer; 20. Two-dimensional layered material layer; 30. Second metal organic framework layer. DETAILED DESCRIPTION

[0029] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present disclosure will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted. In addition, the drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale.

[0030] The terms "a", "an", "the", "said" and "at least one" are used to indicate the presence of one or more elements / components / etc.; the terms "including" and "having" are used to express an open-ended inclusion and mean that additional elements / components / etc. may exist in addition to the listed elements / components / etc.; the terms "first", "second", etc. are used merely as labels and are not intended to limit the quantity of their objects.

[0031] The term "two-dimensional layered material" refers to a crystalline material composed of orderly stacked structural units of a single layer or a few layers of atomic thickness, which has the characteristics of ultra-thinness, large surface area and quantum size effect. The thickness of two-dimensional layered materials is usually between a few nanometers and hundreds of nanometers, and may even reach tens of nanometers to hundreds of nanometers. The basic structure of two-dimensional layered materials includes two extended planes, in which atoms are arranged along the direction parallel to the surface of the material; atoms within the layer are bound by strong covalent bonds, while the layers interact with each other through weak van der Waals forces. Two-dimensional layered materials can overlap each other in three-dimensional space to form various structural forms, such as single-layer sheets, double-layer sheets, multi-layer sheets, etc.

[0032] The present disclosure provides a metal organic framework modified lubricating material, such as Figure 1As shown, it includes a first metal organic framework layer 10, a two-dimensional layered material layer 20 and a second metal organic framework layer 30 which are stacked in sequence. The two-dimensional layered material layer 20 includes a two-dimensional layered material; the first metal organic framework layer 10 and the second metal organic framework layer 30 both include a plurality of spherical metal organic framework materials, and the spherical metal organic framework materials are all formed on the surface of the two-dimensional layered material layer 20.

[0033] Metal-organic framework materials (MOFs) are nanoporous materials composed of metal clusters / ions and organic ligands. The diversity of types and coordination modes of metal elements and organic ligands determines that MOFs have rich structures and functionality. The inorganic-organic hybrid properties of MOFs can fill the blank area between inorganic and organic materials in mechanical properties, and can combine the advantages of inorganic and organic materials, transcending traditional "soft" materials and "hard" materials. The metal-organic framework-modified lubricating material provided in this embodiment is a metal-organic framework layer formed on two extended planes of a two-dimensional layered material; the metal-organic framework layer is a layer of spherical metal-organic framework material. In this way, when the metal-organic framework-modified lubricating material is used, multiple Figure 1 The stacked structure shown, based on the "ball bearing" effect of the spherical metal-organic framework material, converts sliding friction into rolling friction, which can greatly reduce the friction coefficient. At the same time, the spherical metal-organic framework material can also fill in the worn area and repair the worn surface, further improving the lubrication effect. Therefore, the metal-organic framework modified lubricating material provided in this embodiment can effectively reduce the friction coefficient, reduce wear, and thus extend the service life of the device and reduce maintenance costs.

[0034] In one example, the length dimension of the two-dimensional layered material is 3 to 5 μm. In this embodiment, the spherical metal-organic framework material at the overlapping contact position of the metal-organic framework-modified lubricating material can reduce the friction coefficient by rolling friction. In this way, if the length of the two-dimensional layered material is too large or too small, it will affect the uniform distribution of the spherical metal-organic framework material in the metal-organic framework layer. For example, if the length of the two-dimensional layered material is too small, the area of ​​the overlapping contact position of the metal-organic framework-modified lubricating material is reduced, which may result in the inability to form more effective rolling friction, thereby affecting the friction coefficient and reducing the lubrication performance.

[0035] In an exemplary embodiment, the particle size of the spherical metal organic framework material is 200-500 nm. In the metal organic framework modified lubricating material, the smaller the particle size of the spherical metal organic framework material, the smaller the friction coefficient generated by rolling friction, thereby improving the lubricity of the metal organic framework modified lubricating material. At the same time, the spherical metal organic framework material with a small particle size is more conducive to filling and repairing the worn surface.

[0036] The present disclosure also provides a method for preparing the metal organic framework modified lubricating material. Figure 2 As shown, the method comprises the following steps: S10, dispersing the two-dimensional layered material into an ethanol solution of a silane coupling agent for modification to obtain a modified two-dimensional layered material, wherein the mass ratio of the two-dimensional layered material to the silane coupling agent is (10-20):1.

[0037] S20, mixing the modified two-dimensional layered material obtained in step S10 with nitrate and N,N-dimethylformamide to obtain a first mixed solution, wherein the molar ratio of the two-dimensional layered material to the nitrate is 10:(1-1.5).

[0038] S30, adding N,N-dimethylformamide containing an organic ligand to the first mixed solution to obtain a second mixed solution, wherein the molar ratio of the organic ligand to the nitrate is (1-2):1.

[0039] S40, reacting the second mixed solution at 120-180° C. for 12-24 hours, filtering and drying to obtain a metal organic framework modified lubricating material.

[0040] In the preparation method provided in this embodiment, a silane coupling agent is used to modify the surface of a two-dimensional layered material, and then nitrate and an organic ligand are added to prepare a spherical metal organic framework material by a solvent thermal method, and the spherical metal organic framework material is allowed to grow in situ on the surface of the two-dimensional layered material to form a metal organic framework layer, thereby forming a sandwich structure having a metal organic framework layer / two-dimensional layered material layer / metal organic framework layer. In other words, Figure 1 As shown, the spherical metal organic framework material is in situ grown on the surface of the two-dimensional layered material through the auxiliary modification of the silane coupling agent, and a metal organic framework layer having a layer of spherical metal organic framework material is formed on both extended surfaces of the two-dimensional layer material. In this way, the "ball bearing" effect of the metal organic framework modified lubricating material in the friction process can be utilized to convert sliding friction into rolling friction, significantly reducing the friction coefficient. At the same time, during the friction process, after the spherical metal organic framework layer is worn, the detached spherical metal organic framework material can also fill and repair the tiny defects on the friction surface, further reducing the friction coefficient of the friction surface, achieving the synergistic effect of enhancing lubrication performance and improving self-healing properties, reducing environmental pollution, reducing energy consumption, and significantly improving the lubrication performance of the metal organic framework modified lubricating material under extreme conditions such as high temperature and high pressure.

[0041] This embodiment uses a silane coupling agent to assist in the modification of the two-dimensional layered material. The silane coupling agent forms a bond between the surface of the two-dimensional layered material and the spherical metal-organic framework material through hydrolysis, so that spherical metal-organic framework materials with uniform size and appropriate distribution are formed on the surface of the two-dimensional layered material, thereby improving the lubrication performance of the metal-organic framework modified lubricating material.

[0042] In this embodiment, the mass ratio of the two-dimensional layered material to the silane coupling agent is in the range of (10~20):1, and the silane coupling agent can uniformly modify the two-dimensional layered material, which is conducive to forming a uniform and consistent spherical metal organic framework material on the surface of the two-dimensional layered material. If the amount of the two-dimensional layered material added is too small, the solubility of the silane coupling agent is too large, which is easy to cause the silane coupling agent to agglomerate and is not conducive to the formation of a spherical metal organic framework material on the surface of the two-dimensional layered material. If the amount of the two-dimensional layered material added is too large, the concentration of the silane coupling agent is reduced, the modification of the two-dimensional layered material is incomplete, and the formation of the spherical metal organic framework material on the surface of the two-dimensional layered material is reduced, thereby reducing the spherical structure used to achieve sliding friction and reducing the lubrication performance.

[0043] Exemplarily, the mass ratio of the two-dimensional layered material to the silane coupling agent can be, but is not limited to, 10:1 or 11:1 or 12:1 or 14:1 or 15:1 or 16:1 or 16.7:1 or 18:1 or 20:1.

[0044] In this embodiment, by controlling the molar ratio of the organic ligand to the nitrate in the range of (1~2):1, the prepared metal organic framework material is spherical in shape and uniform in size. Through the spherical metal organic framework material, during the friction process, the sliding friction between the two-dimensional layered material and the friction surface or between two adjacent layers of the two-dimensional layered material is converted into the rolling friction of the spherical metal organic framework material, thereby greatly reducing the friction coefficient and improving the lubricity of the lubricant containing the metal organic framework modified lubricating material.

[0045] Exemplarily, the molar ratio of the organic ligand to the nitrate can be, but is not limited to, 1:1 or 1.1:1 or 1.2:1 or 1.3:1 or 1.4:1 or 1.5:1 or 1.6:1 or 1.7:1 or 1.8:1 or 1.9:1 or 2:1.

[0046] In this embodiment, the molar ratio of the two-dimensional layered material to the nitrate is limited to 10: (1~1.5) to avoid too much or too little two-dimensional layered material after modification, which affects the uniformity of the metal organic framework material grown on the surface of the two-dimensional layered material, and further affects the lubricity of the prepared metal organic framework modified lubricating material. For example, if the molar ratio of the two-dimensional layered material is too large, the metal organic framework material grown on the surface of the two-dimensional layered material will be unevenly distributed, for example, spherical metal organic framework materials will not grow locally on the surface of the two-dimensional layered material, thereby affecting the lubrication performance; if the molar ratio of the two-dimensional layered material is too small, the metal organic framework material grown on the surface of the two-dimensional layered material may accumulate and stack, so that rolling friction cannot be well achieved, and the lubricity of the metal organic framework modified lubricating material is reduced.

[0047] Exemplarily, the molar ratio of the two-dimensional layered material to the nitrate may be, but is not limited to, 10:1 or 10:1.1 or 10:1.2 or 10:1.3 or 10:1.4 or 10:1.5.

[0048] Exemplarily, in step S40, the reaction conditions of the second mixed solution may be, but are not limited to, reaction at 120°C for 16 h, or reaction at 120°C for 20 h, or reaction at 120°C for 24 h, or reaction at 120°C for 12 h, or reaction at 140°C for 18 h, or reaction at 140°C for 16 h, or reaction at 140°C for 22 h, or reaction at 160°C for 12 h, or reaction at 160°C for 18 h, or reaction at 160°C for 20 h, or reaction at 180°C for 12 h, or reaction at 180°C for 18 h, or reaction at 180°C for 22 h, or reaction at 180°C for 24 h.

[0049] In one embodiment of the present disclosure, the mass percentage of the silane coupling agent in the ethanol solution of the silane coupling agent in step S10 is 2-5%. Within this mass percentage range, the silane coupling agent can better modify the surface of the two-dimensional layered material. The mass percentage of the silane coupling agent is too small, the surface modification of the two-dimensional layered material is incomplete, and the metal organic framework material in the subsequent steps cannot grow well on the surface of the two-dimensional layered material. It also makes the spherical metal organic framework material formed on the surface of the two-dimensional layered material have a small density or uneven distribution, and the lubrication performance is reduced. The mass percentage of the silane coupling agent is too large and the concentration is too high, and the silane coupling agent molecules are prone to agglomeration, which hinders the further combination of other functional molecules and cannot achieve effective modification of the two-dimensional layered material. In this way, using a silane coupling agent ethanol solution with a mass percentage of 2-5%, the silane coupling agent itself can be avoided from agglomerating, and the surface of the two-dimensional layered material can be completely modified, and the uniformity of the formed spherical metal organic framework layer can be improved.

[0050] In one embodiment of the present disclosure, the silane coupling agent may be at least one of silane coupling agent KH550, silane coupling agent KH560 or silane coupling agent KH570. Taking silane coupling agent KH550 as an example, silane coupling agent KH550 is aminosilane, and its structural formula is as follows:

[0051] When aminosilane is used to modify the two-dimensional layered material, the three alkoxy groups of the aminosilane are hydrolyzed and combined with the surface of the two-dimensional layered material. The amino end of the aminosilane can couple with the metal ions in the metal-organic framework material, assisting the in-situ growth of the metal-organic framework material on the surface of the two-dimensional layered material.

[0052] In one embodiment of the present disclosure, in step S10, the two-dimensional layered material is one or two of molybdenum disulfide, tungsten disulfide, and graphene.

[0053] In one example, the length of the two-dimensional layered material is 3-5 μm. In this way, the length of the two-dimensional layered material is prevented from being too large or too small, which affects the rolling friction effect and thus reduces the lubricity.

[0054] In one embodiment of the present disclosure, in step S20, the nitrate is one or more of nickel nitrate hexahydrate, cobalt nitrate hexahydrate or copper nitrate trihydrate; in step S30, the organic ligand is one or two of 3-indolecarboxylic acid and 1,3,5-benzenetricarboxylic acid. In this way, the above-mentioned nitrate and the above-mentioned ligand are reacted in a molar ratio of 1: (1~2) in N, N-dimethylformamide solvent by solvothermal method, and uniform spherical metal organic framework materials can be grown on the surface of the two-dimensional layered material under the action of silane coupling agent, and the spherical metal organic framework materials with high uniformity and small particle size can further reduce the friction coefficient during the friction process. For example, spherical Cu-MOFs can be formed on the surface of the two-dimensional layered material using copper nitrate trihydrate, 1,3,5-benzenetricarboxylic acid and solvent N, N-dimethylformamide.

[0055] In one example, in step S10, the two-dimensional layered material is tungsten disulfide, the silane coupling agent is silane coupling agent KH550, and the mass ratio of tungsten disulfide to silane coupling agent KH550 is 16.7:1. In step S20, the nitrate is nickel nitrate hexahydrate; the molar ratio of the two-dimensional layered material to nickel nitrate hexahydrate is 10:1.4. In step S30, the organic ligand is 3-indolecarboxylic acid, and the molar ratio of 3-indolecarboxylic acid to nickel nitrate hexahydrate is 2:1.

[0056] The disclosed embodiment also provides a solid lubricating coating, including 15-25 parts of a composite binder, 3-5 parts of an additive, 35-50 parts of a solvent, and 20-35 parts of a metal organic framework modified lubricating material prepared by the preparation method described in any of the above embodiments. In this way, the metal organic framework modified lubricating material is mixed with a composite binder, an additive and a mixed solvent to form a solid lubricating coating, which can convert sliding friction into rolling friction through the "ball bearing" effect during the friction process, significantly reduce the friction coefficient, and can fill and repair tiny defects on the friction surface, achieve a synergistic effect of enhanced lubrication, and significantly improve the lubrication performance of the solid lubricating coating under extreme conditions such as high temperature and high pressure, effectively reducing friction and wear.

[0057] In one example, the composite adhesive comprises acrylic modified epoxy resin and polyimide resin. Exemplarily, in the composite adhesive, the mass ratio of acrylic modified epoxy resin to polyimide resin is 2: (1-1.5).

[0058] In one example, the additive includes one or more of a dispersant, a defoamer, a leveling agent or an anti-settling agent. Among them, the leveling agent and the anti-settling agent can improve the stability of the solid lubricating coating and extend the storage time. Exemplarily, the additive includes at least a dispersant and a defoamer.

[0059] In one example, the solvent includes at least a solvent capable of dissolving acrylic modified epoxy resin and polyimide resin. Exemplarily, the solvent may include xylene, cyclohexanone, N,N-dimethylformamide and n-butanol; the combined use of the above solvents can fully dissolve the acrylic modified epoxy resin and the polyimide resin, providing a uniform binder for preparing the solid lubricating coating. Exemplarily, the solvent may also include isopropanol and n-butyl acetate, isopropanol can increase the antifreeze property of the solid lubricating coating, and n-butyl acetate can be used as a cosolvent to improve the solubility of each component in the solid lubricating coating and improve the uniformity of the prepared solid lubricating coating.

[0060] In one embodiment of the present disclosure, a wear-resistant filler is also included. In this way, the lubricating coating prepared can have high lubrication performance, high temperature resistance, and wear resistance, further extending the service life of the lubricating coating.

[0061] In one example, the wear-resistant filler can be fibrous calcium sulfate, and the whisker length of the fibrous calcium sulfate is 5-8 μm, and the whisker diameter is 0.5-2 μm. Fibrous calcium sulfate can grow in the form of a single crystal, with a uniform cross-section, a complete internal structure and a stable aspect ratio, so that the fibrous calcium sulfate has excellent mechanical properties, high temperature resistance, compatibility and wear resistance. As a wear-resistant filler, it can significantly improve the overall performance of the prepared solid lubricating coating.

[0062] The performance of the lubricating coating provided by the present disclosure is further illustrated below in conjunction with specific embodiments.

[0063] Example 1 Step 1: Preparation of metal organic framework modified lubricating material S10, take 50g of tungsten disulfide and disperse it in an ethanol solution of aminosilane (silane coupling agent KH550), stir at 600rpm, and stir at room temperature for 4h for modification. The total mass of the ethanol solution of aminosilane is 150g, and the mass percentage of aminosilane in the ethanol solution of aminosilane is 2%. After filtering, washing, and drying, the modified two-dimensional layered material is obtained.

[0064] S20. Add the modified two-dimensional layered material obtained in step S10 and 8.4 g of nickel nitrate hexahydrate into 200 mL of N,N-dimethylformamide solution, and stir until the mixture is uniform to obtain a first mixed solution.

[0065] S30, take 9.3 g of 3-indolecarboxylic acid and add it to 50 mL of N,N-dimethylformamide solution. After it is completely dissolved, slowly add it to the first mixed solution, stir and mix evenly, place it in an oven for reaction, the reaction temperature is 160°C, the reaction time is 12 h, after the reaction is completed, filter, wash and dry the product to obtain a metal organic framework modified lubricating material 1.

[0066] Step 2: Obtain the raw materials for lubricating coatings Weigh 25g of metal organic framework modified lubricating material 1, 12g of fibrous calcium sulfate, 14g of acrylic modified epoxy resin, 7g of polyimide resin, 2g of dispersant BYK-2013 (brand is BYK, model is BYK-2013), 1g of defoaming agent BYK-052N (brand is BYK, model is BYK-052N), 0.5g of leveling agent BYK-333 (brand is BYK, model is BYK-333), 0.5g of anti-settling agent BYK-410 (brand is BYK, model is BYK-410), 17g of xylene, 10g of cyclohexanone, 7g of N,N-dimethylformamide, 2g of n-butanol, 1g of isopropanol, and 1g of n-butyl acetate.

[0067] Step 3: Preparation of solid lubricating coating The solid lubricating coating is prepared according to the amount weighed in step 2, and the steps are as follows: S100, xylene, cyclohexanone, N,N-dimethylformamide, n-butanol, isopropanol, and n-butyl acetate are uniformly mixed, and then acrylic modified epoxy resin and polyimide resin are added, and stirred until completely dissolved to obtain a composite adhesive solution.

[0068] S200. Add dispersant BYK-2013 to the composite binder solution, stir at 600 rpm for 10 minutes, increase the stirring speed to 1500 rpm, add the metal organic framework modified lubricating material 1 and fibrous calcium sulfate in several times while stirring, stir for 20 minutes, add the defoaming agent BYK-052N and continue stirring for 10 minutes to obtain a lubricating coating prefabricated liquid.

[0069] S300, after ball milling and dispersing the lubricating coating pre-liquid for 2 hours in a ball mill, filtering with a 200-mesh filter, adding leveling agent BYK-333 and anti-settling agent BYK-410, and mixing, the lubricating coating obtained is defined as solid lubricating coating 1.

[0070] Example 2 Step 1: Preparation of metal organic framework modified lubricating material According to the preparation method provided in step 1 of Example 1, a metal organic framework modified lubricating material 2 is obtained.

[0071] Step 2: Obtain the raw materials for lubricating coatings Weigh 20 g of metal organic framework modified lubricating material 2, 15 g of fibrous calcium sulfate, 14.3 g of acrylic modified epoxy resin, 10.7 g of polyimide resin, 2 g of dispersant BYK-2013, 1 g of defoamer BYK-052N, 0.5 g of leveling agent BYK-333, 0.5 g of anti-settling agent BYK-410, 15 g of xylene, 12 g of cyclohexanone, 4 g of N, N-dimethylformamide, 2 g of n-butanol, 2 g of isopropanol, and 1 g of n-butyl acetate.

[0072] Step 3: Preparation of solid lubricating coating According to step 2 of this embodiment, the weight of each raw material is weighed to prepare a solid lubricating coating, and the steps are the same as step 3 in embodiment 1. The obtained lubricating coating is defined as solid lubricating coating 2.

[0073] Example 3 Step 1: Preparation of metal organic framework modified lubricating material S10, taking 50g of molybdenum disulfide and dispersing it in an ethanol solution of aminosilane, stirring at 600 rpm and stirring at room temperature for 4h for modification. The total mass of the ethanol solution of aminosilane is 250g, and the mass percentage of aminosilane in the ethanol solution of aminosilane is 2%. After filtering, washing and drying, the modified two-dimensional layered material is obtained.

[0074] S20. Add the modified two-dimensional layered material obtained in step S10 and 9.28 g of nickel nitrate hexahydrate into 200 mL of N,N-dimethylformamide solution, and stir until the mixture is uniform to obtain a first mixed solution.

[0075] S30, take 10.3 g of 3-indolecarboxylic acid and add it to 50 mL of N,N-dimethylformamide solution. After it is completely dissolved, slowly add it to the first mixed solution, stir and mix evenly, place it in an oven for reaction, the reaction temperature is 180°C, the reaction time is 12 h, after the reaction is completed, filter, wash and dry the product to obtain metal organic framework modified lubricating material 3.

[0076] Step 2: Obtaining the raw materials of solid lubricating coating Weigh 35 g of metal organic framework modified lubricating material 3, 10 g of fibrous calcium sulfate, 12 g of acrylic modified epoxy resin, 6 g of polyimide resin, 1 g of dispersant BYK-2013, 1 g of defoamer BYK-052N, 0.5 g of leveling agent BYK-333, 0.5 g of anti-settling agent BYK-410, 12 g of xylene, 10 g of cyclohexanone, 6 g of N, N-dimethylformamide, 3 g of n-butanol, 2 g of isopropanol, and 1 g of n-butyl acetate.

[0077] Step 3: Preparation of solid lubricating coating According to step 2 of this embodiment, the weight of each raw material is weighed to prepare a solid lubricating coating, and the preparation steps are the same as step 3 in embodiment 1. The obtained lubricating coating is defined as solid lubricating coating 3.

[0078] Example 4 Step 1: Preparation of metal organic framework modified lubricating material S10, take 50g of tungsten disulfide and disperse it in the ethanol solution of aminosilane, stir it at 600 rpm and room temperature for 4h for modification. The total mass of the ethanol solution of aminosilane is 125g, and the mass percentage of aminosilane in the ethanol solution of aminosilane is 2%. After filtering, washing and drying, the modified two-dimensional layered material is obtained.

[0079] S20. Add the modified two-dimensional layered material obtained in step S10 and 7.5 g of cobalt nitrate hexahydrate into 200 mL of N,N-dimethylformamide solution, and stir until the mixture is uniform to obtain a first mixed solution.

[0080] S30, take 5.4 g of 1,3,5-benzenetricarboxylic acid and add it to 50 mL of N,N-dimethylformamide solution. After it is completely dissolved, slowly add it to the first mixed solution, stir and mix evenly, place it in an oven for reaction, the reaction temperature is 120°C, the reaction time is 20 h, after the reaction is completed, filter, wash and dry the product to obtain metal organic framework modified lubricating material 4.

[0081] Step 2: Obtaining the raw materials of solid lubricating coating Weigh 30 g of metal organic framework modified lubricating material 4, 13 g of fibrous calcium sulfate, 8.6 g of acrylic modified epoxy resin, 6.4 g of polyimide resin, 3 g of dispersant BYK-2013, 1 g of defoamer BYK-052N, 0.5 g of leveling agent BYK-333, 0.5 g of anti-settling agent BYK-410, 15 g of xylene, 11 g of cyclohexanone, 6 g of N, N-dimethylformamide, 2 g of n-butanol, 2 g of isopropanol, and 1 g of n-butyl acetate respectively.

[0082] Step 3: Preparation of solid lubricating coating According to step 2 of this embodiment, the weight of each raw material is weighed to prepare the solid lubricating coating. The preparation steps are the same as step 3 in embodiment 1. The obtained lubricating coating is defined as solid lubricating coating 4.

[0083] Example 5 Step 1: Preparation of metal organic framework modified lubricating material S10, take 50g of tungsten disulfide and disperse it in the ethanol solution of aminosilane, stir it at 600 rpm and room temperature for 4h for modification. The total mass of the ethanol solution of aminosilane is 150g, and the mass percentage of aminosilane in the ethanol solution of aminosilane is 2%. After filtering, washing and drying, the modified two-dimensional layered material is obtained.

[0084] S20, adding the modified two-dimensional layered material obtained in step S10 and 7.2 g of copper nitrate trihydrate into 200 mL of N,N-dimethylformamide solution, stirring until mixed evenly, to obtain a first mixed solution.

[0085] S30, take 6.3g of 1,3,5-benzenetricarboxylic acid and add it to 50mL N,N-dimethylformamide solution. After it is completely dissolved, slowly add it to the first mixed solution, stir and mix evenly, place it in an oven for reaction, the reaction temperature is 120℃, the reaction time is 24h, after the reaction is completed, filter, wash and dry the product to obtain metal organic framework modified lubricating material 5.

[0086] Step 2: Obtaining the raw materials of solid lubricating coating Weigh 20 g of metal organic framework modified lubricating material 5, 11 g of fibrous calcium sulfate, 10 g of acrylic modified epoxy resin, 5 g of polyimide resin, 2 g of dispersant BYK-2013, 1 g of defoamer BYK-052N, 0.5 g of leveling agent BYK-333, 0.5 g of anti-settling agent BYK-410, 20 g of xylene, 16 g of cyclohexanone, 7 g of N, N-dimethylformamide, 3 g of n-butanol, 3 g of isopropanol, and 1 g of n-butyl acetate.

[0087] Step 3: Preparation of solid lubricating coating According to step 2 of this embodiment, the weight of each raw material is weighed to prepare the solid lubricating coating. The preparation steps are the same as step 3 in embodiment 1. The obtained lubricating coating is defined as solid lubricating coating 5.

[0088] Comparative Example 1 Step 1: Obtain the raw materials of solid lubricating coating Weigh 25 g of tungsten disulfide, 11 g of fibrous calcium sulfate, 15 g of acrylic modified epoxy resin, 7.5 g of polyimide resin, 2 g of dispersant BYK-2013, 1 g of defoamer BYK-052N, 0.5 g of leveling agent BYK-333, 0.5 g of anti-settling agent BYK-410, 26 g of xylene, 11.5 g of cyclohexanone, 5 g of N, N-dimethylformamide, 3 g of n-butanol, 1 g of isopropanol, and 1 g of n-butyl acetate.

[0089] Step 2: Preparation of solid lubricating coating According to the weight of each raw material weighed in step 1, the solid lubricating coating is prepared as follows: S100, xylene, cyclohexanone, N,N-dimethylformamide, n-butanol, isopropanol, and n-butyl acetate are uniformly mixed, and then acrylic modified epoxy resin and polyimide resin are added, and stirred until completely dissolved to obtain a composite adhesive solution.

[0090] S200, add dispersant BYK-2013 to the composite binder solution, stir at 600 rpm for 10 minutes, increase the stirring speed to 1500 rpm, add tungsten disulfide and fibrous calcium sulfate in several times while stirring, stir for 20 minutes, add defoamer BYK-052N and continue stirring for 10 minutes to obtain a lubricating coating prefabricated liquid.

[0091] S300, after ball milling and dispersing the lubricating coating pre-liquid for 2 hours in a ball mill, filtering with a 200-mesh filter, adding leveling agent BYK-333 and anti-settling agent BYK-410, and mixing, the obtained lubricating coating is defined as solid lubricating coating 6.

[0092] Comparative Example 2 Step 1: Obtain the raw materials of solid lubricating coating Weigh 20 g of molybdenum disulfide, 14 g of fibrous calcium sulfate, 16 g of acrylic modified epoxy resin, 8 g of polyimide resin, 2 g of dispersant BYK-2013, 1 g of defoamer BYK-052N, 0.5 g of leveling agent BYK-333, 0.5 g of anti-settling agent BYK-410, 20 g of xylene, 10 g of cyclohexanone, 4 g of N, N-dimethylformamide, 2 g of n-butanol, 1 g of isopropanol, and 1 g of n-butyl acetate.

[0093] Step 2: Preparation of solid lubricating coating According to the weight of each raw material weighed in step 1, the solid lubricating coating is prepared as follows: S100, xylene, cyclohexanone, N,N-dimethylformamide, n-butanol, isopropanol, and n-butyl acetate are uniformly mixed, and then acrylic modified epoxy resin and polyimide resin are added, and stirred until completely dissolved to obtain a composite adhesive solution.

[0094] S200, add dispersant BYK-2013 to the composite binder solution, stir at 600 rpm for 10 minutes, increase the stirring speed to 1500 rpm, add molybdenum disulfide and fibrous calcium sulfate in multiple times while stirring, stir for 20 minutes, add defoamer BYK-052N and continue stirring for 10 minutes to obtain a lubricating coating prefabricated liquid.

[0095] S300, after ball milling and dispersing the lubricating coating pre-liquid for 2 hours in a ball mill, filtering with a 200-mesh filter, adding leveling agent BYK-333 and anti-settling agent BYK-410, and mixing, the obtained lubricating coating is defined as solid lubricating coating 7.

[0096] The solid lubricating coatings 1 to 7 prepared in the above-mentioned Examples 1 to 5 and Comparative Examples 1 to 2 were sprayed on the surface of bearing steel GCr15 to prepare solid lubricating coatings.

[0097] Spraying method: The nozzle diameter used is 1.0~1.5mm, and the spraying pressure is set to 0.3~0.5Mpa. During spraying, the distance between the nozzle and the bearing steel GCr15 is within the range of 20~30cm. After spraying, keep warm at 250~270℃ for 20~30min, and then keep warm at 120~150℃ for 15~20min. The thickness of the prepared solid lubricating coating is 20~30μm. The solid lubricating coating prepared on the surface of the bearing steel GCr15 was observed by SEM (scanning electron microscope). The SEM results of the solid lubricating coating formed after spraying the solid lubricating coating 1 prepared in Example 1 are shown in Figure 3 The SEM results of the solid lubricating coating formed after spraying the solid lubricating coating 2 prepared in Example 2 are shown in Figure 4 .Depend on Figure 3 and Figure 4 It can be seen that the solid lubricating coating formed after spraying the solid lubricating coating prepared in the embodiment of the present disclosure has a uniform and smooth surface, no bubbles, and excellent density.

[0098] The solid lubricating coatings formed by spraying the solid lubricating coatings 1 to 7 prepared in various embodiments and comparative examples were subjected to performance tests. The results are shown in Table 1.

[0099] Table 1. Performance test table of solid lubricating coatings formed by solid lubricating coatings 1 to 7

[0100] Adhesion: The adhesion rating was determined by the cross-hatch method, according to ISO classification: 0 (smooth cutting edge, no shedding) to 5 (shedding area exceeds 65%). The results are shown in Table 1, and solid lubricating coatings 1 to 5 are all 0, indicating that the lubricating material prepared by the preparation method provided by the present disclosure can be well adhered to the surface of the device after spraying, and is not easy to fall off, thereby improving the service life and lubrication effect of the formed solid lubricating coating.

[0101] Friction coefficient: The friction coefficient of the coating was tested using the reciprocating module of the friction and wear tester, with a load of 10 N (Newton), a time of 60 min, a test frequency of 0.5 Hz, and a length of 5 mm for the bearing steel GCr15 coated with a solid lubricant coating. Figure 5 , Figure 6 and Figure 7 As shown in Table 1, the friction coefficient of the solid lubricating coatings prepared by solid lubricating coatings 1 to 5 is much lower than the friction coefficient of the solid lubricating coatings prepared by solid lubricating coatings 6 and 7. This is because the solid lubricating coatings 1 to 5 contain the metal organic framework modified lubricating material provided by the present disclosure, and during the friction process, the spherical metal organic framework material converts the sliding friction into rolling friction, thereby greatly reducing the friction coefficient and improving the lubrication performance of the solid lubricating coating.

[0102] Wear amount: Referring to GB / T 1768 standard, a CS-10 rubber grinding wheel was used, loaded with a 1kg weight, the rotation speed was 60 rpm, and the mass loss after 1000 revolutions was recorded. The results are shown in Table 1. The wear amount of the solid lubricating coatings prepared by solid lubricating coatings 1 to 5 is much lower than the wear amount of the solid lubricating coatings prepared by solid lubricating coatings 6 and solid lubricating coatings 7. The metal organic framework nanoparticles in solid lubricating coatings 1 to 5 reduce the friction coefficient due to the "ball bearing" effect, which reduces the wear amount to a certain extent. At the same time, the nanoscale metal organic framework material in the worn solid lubricating coating can be filled into the tiny defects formed on the wear surface, achieving a synergistic effect of enhancing lubrication. In this way, the solid lubricating coating provided in the embodiment of the present disclosure has higher wear resistance than the solid lubricating coating prepared by the two-dimensional layered material without metal organic framework modification in the comparative example, thereby increasing the service life of the solid lubricating coating.

[0103] Heat resistance: Referring to GB / T 1735 standard, at a preset temperature, the color and gloss of the coating do not change significantly, and there is no blistering, cracking, shedding and other phenomena. The heat resistance test results are shown in Table 1. The heat resistance temperature of solid lubricating coatings 1~2 and 4~5 is higher than that of solid lubricating coatings 6~7. It shows that the use of tungsten disulfide as a two-dimensional layered material can improve the heat resistance of the prepared solid lubricating coating.

[0104] Compared with Example 1 and Example 2, Example 1 and Example 2 use tungsten disulfide as the two-dimensional layered material, and spherical Ni-MOFs are grown on the surface of tungsten disulfide. In Example 3, molybdenum disulfide is used as the two-dimensional layered material, and spherical Ni-MOFs are grown on the surface of molybdenum disulfide. Referring to the performance test results in Table 1, the friction coefficient of the solid lubricating coating 3 prepared by using molybdenum disulfide as the two-dimensional layered material is slightly increased compared with that of the solid lubricating coatings 1 and 2; at the same time, the heat resistance of the solid lubricating coating 3 prepared by using molybdenum disulfide is also reduced. It shows that the use of tungsten disulfide as the two-dimensional layered material can further enhance the lubrication performance of the prepared solid lubricating coating.

[0105] Therefore, the solid lubricating coating prepared by the metal organic framework modified lubricating material provided by the present invention can significantly reduce the friction coefficient and wear rate of the friction surface, improve the operating efficiency and reliability of mechanical equipment, and can solve the shortcomings of traditional lubricating oil and grease systems in terms of lubrication failure, environmental adaptability, volatilization, pollution, and performance limitations under high temperature and high pressure, and has more application scenarios.

[0106] It should be noted that, although the steps of the method for preparing the metal organic framework modified lubricating material in the present disclosure are described in a specific order in the accompanying drawings, this does not require or imply that the steps must be performed in this specific order, or that all the steps shown must be performed to achieve the desired results. Additionally or alternatively, some steps may be omitted, multiple steps may be combined into one step, and / or one step may be decomposed into multiple steps, etc.

[0107] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any modification, use or adaptation of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the appended claims.

Claims

1. A metal organic framework modified lubricating material, characterized in that: It comprises a first metal organic framework layer (10), a two-dimensional layered material layer (20) and a second metal organic framework layer (30) which are stacked in sequence; The two-dimensional layered material layer (20) comprises a two-dimensional layered material; The first metal-organic framework layer (10) and the second metal-organic framework layer (30) both comprise a plurality of spherical metal-organic framework materials, and the spherical metal-organic framework materials are both formed on the surface of the two-dimensional layered material layer (20).

2. The metal organic framework modified lubricating material according to claim 1, characterized in that: The length dimension of the two-dimensional layered material is 3-5 μm; The particle size of the spherical metal organic framework material is 200-500nm.

3. A method for preparing the metal organic framework modified lubricating material according to claim 1, characterized in that: The following steps are involved: S10, dispersing the two-dimensional layered material into an ethanol solution of a silane coupling agent for modification to obtain a modified two-dimensional layered material; Wherein, the mass ratio of the two-dimensional layered material to the silane coupling agent is (10-20):1; S20, mixing the modified two-dimensional layered material obtained in step S10 with nitrate and N,N-dimethylformamide to obtain a first mixed solution; Wherein, the molar ratio of the two-dimensional layered material to the nitrate is 10:(1-1.5); S30, adding N,N-dimethylformamide containing an organic ligand to the first mixed solution to obtain a second mixed solution; The molar ratio of organic ligand to nitrate is (1~2):1; S40, reacting the second mixed solution at 120-180° C. for 12-24 hours, filtering and drying to obtain a metal organic framework modified lubricating material.

4. The method for preparing the metal organic framework modified lubricating material according to claim 3, characterized in that: In step S20, the nitrate is at least one of nickel nitrate hexahydrate, cobalt nitrate hexahydrate, and copper nitrate trihydrate; In step S30, the organic ligand is at least one of 3-indolecarboxylic acid and 1,3,5-benzenetricarboxylic acid.

5. The method for preparing the metal organic framework modified lubricating material according to claim 3 or 4, characterized in that: In step S10, the mass percentage of the silane coupling agent in the ethanol solution of the silane coupling agent is 2-5%; The silane coupling agent is silane coupling agent KH550.

6. The method for preparing the metal organic framework modified lubricating material according to claim 3 or 4, characterized in that: In step S10, the two-dimensional layered material is at least one of molybdenum disulfide, tungsten disulfide, and graphene; The length dimension of the two-dimensional layered material is 3-5 μm.

7. The method for preparing the metal organic framework modified lubricating material according to claim 3, characterized in that: In step S10, the two-dimensional layered material is tungsten disulfide, and the silane coupling agent is silane coupling agent KH550; the mass ratio of tungsten disulfide to silane coupling agent KH550 is 16.7:1; In step S20, the nitrate is nickel nitrate hexahydrate; the molar ratio of tungsten disulfide to nickel nitrate hexahydrate is 10:1.4; In step S30, the organic ligand is 3-indolecarboxylic acid, and the molar ratio of 3-indolecarboxylic acid to nickel nitrate hexahydrate is 2:

1.

8. A solid lubricating coating, characterized in that: By weight, it comprises 15 to 25 parts of a composite binder, 3 to 5 parts of an additive, 35 to 50 parts of a solvent, and 20 to 35 parts of a metal organic framework modified lubricating material prepared by the preparation method according to any one of claims 3 to 7; The composite adhesive comprises acrylic modified epoxy resin and polyimide resin; The auxiliary agent includes one or more of a dispersant, a defoamer, a leveling agent, and an anti-settling agent.

9. The solid lubricating coating according to claim 8, characterized in that: In the composite adhesive, the mass ratio of acrylic modified epoxy resin to polyimide resin is 2:(1-1.5).

10. The solid lubricating coating according to claim 8 or 9, characterized in that: Also included are wear-resistant fillers; The wear-resistant filler is fibrous calcium sulfate, the whisker length of the fibrous calcium sulfate is 5-8 μm, and the whisker diameter is 0.5-2 μm.

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