An epoxy resin coating material suitable for high load and high speed working conditions under lean oil lubrication, and a preparation method and application thereof

Abstract

The application discloses an epoxy resin coating material suitable for lean oil lubrication high-load high-speed working conditions, which is prepared by the following method: adding metal oxide with a particle size of 50-100 nm into hydroxyl silicone oil modified bisphenol A type epoxy resin, stirring uniformly, grinding, obtaining mixed slurry A; then adding solid lubricant with a particle size of 0.2-2 microns, stirring uniformly, grinding, obtaining mixed slurry B; then adding high-entropy alloy, stirring uniformly, grinding, and obtaining the epoxy resin coating material. The application also discloses the application of the epoxy resin coating material in preparing wear-resistant coatings. The epoxy resin coating material is a "macro-micron-submicron-nanometer" three-scale polymer coating composite material coupling high-entropy alloy particles, solid lubricant and metal compound particles in the hydroxyl silicone oil modified bisphenol A type epoxy resin. The epoxy resin coating material is coated on the surface of a workpiece and solidified to obtain a wear-resistant material, has excellent wear resistance and lubricating performance, and is suitable for lean oil lubrication high-load high-speed working conditions.

Description

Technical Field

[0001] This invention relates to an epoxy resin coating material suitable for lean oil lubrication under high load and high speed conditions, as well as its preparation method and application, belonging to the technical field of epoxy resin composite materials. Background Technology

[0002] With the continuous and rapid development of high-end equipment technology, technicians are raising increasingly stringent operating conditions for moving mechanisms. Boundary lubrication, lean lubrication, and even dry friction conditions are frequently encountered in the field of friction lubrication. These demanding conditions are more prevalent in large-scale high-end equipment fields such as aerospace and wind power generation. The service life of moving mechanisms faces significant challenges; conventional friction-reducing and wear-resistant technologies are insufficient to significantly extend their service life, and the reliability of moving mechanisms is becoming increasingly difficult to control. Based on these issues, polymer-based composite materials, due to their excellent self-lubricating properties, mature production methods, and convenient construction techniques, are beginning to be widely used on the surfaces of moving workpieces, especially in the field of sliding bearings, where they are seeing mass production applications.

[0003] Bisphenol A epoxy resin has been the subject of extensive modification studies by researchers due to its excellent stability, good processability, high bonding strength, low shrinkage, high mechanical strength, and excellent electrical insulation properties. For example, modifications have been carried out on bisphenol A epoxy resin using polyether, polyurethane, phenolic resin, and silicone resin.

[0004] High-entropy alloys are mixtures of multiple metallic elements in equiatomic or near-equiatomic ratios, and are typically prepared using methods such as arc melting, high-frequency induction welding, powder metallurgy, laser cladding, and 3D printing. Many researchers have discovered that high-entropy alloys have strong application potential in terms of strength, plasticity, wear resistance, corrosion resistance, high-temperature resistance, and radiation protection. In particular, high-entropy alloys with a single FCC phase structure coupled with multiple metallic elements can maintain high strength while possessing good plastic deformation capabilities.

[0005] Many studies have shown that transition metal elements can act as catalysts to promote the formation of carbon-based transfer films on the mating surfaces of polymer composites during friction. Ni can rapidly transfer to the mating surfaces, forming a dense NiO layer at the bottom of the friction pair, which further promotes the dehydrogenation and breakage of polyolefin molecules in the tribochemical reaction and accelerates the growth of other transfer films above the bottom transfer film.

[0006] Co (chromium) is an important catalyst widely used in organic synthesis, organometallic chemistry, chemical energy, and materials science, and has been proven to play a crucial role in promoting the growth of carbon-based materials. Under harsh conditions, with the synergistic effects of lubricating media, speed, pressure, and temperature, Cr can rapidly form compounds of different valence states. These compounds readily undergo redox reactions in catalytic processes, enabling chromium-based catalysts to effectively catalyze various redox reactions and further facilitating the rapid construction of transfer membranes.

[0007] Currently, the micro-nano dual-scale design of fillers has been widely used in the application of polymer self-lubricating composite materials, but the design of the three scales of "large micron-submicron-nano" is rarely mentioned. Summary of the Invention

[0008] In view of the above-mentioned prior art, the present invention provides an epoxy resin coating material suitable for high-load and high-speed working conditions with lean oil lubrication, as well as its preparation method and application.

[0009] This invention is achieved through the following technical solution:

[0010] A method for preparing an epoxy resin coating material suitable for high-load, high-speed operation with lean oil lubrication includes the following steps:

[0011] (1) Add metal oxides (nanoscale) with a particle size of 50-100 nm to hydroxyl silicone oil modified bisphenol A epoxy resin. The amount added is 1-10% (weight percentage) of hydroxyl silicone oil modified bisphenol A epoxy resin. Stir evenly and grind to obtain mixed slurry A.

[0012] The metal oxide is selected from any one or more of titanium dioxide, aluminum nitride, and aluminum oxide, and its function is as a catalyst for the construction of a multilayer transfer film.

[0013] (2) Add a solid lubricant (submicron grade) with a particle size of 0.2 to 2 μm to the mixed slurry A. The amount added is 1 to 10% (weight percentage) of the hydroxyl silicone oil modified bisphenol A type epoxy resin. Stir evenly and grind to obtain mixed slurry B.

[0014] The solid lubricant is selected from any one or a combination of two or more of MoS2, BN, WS2, talc, and graphite;

[0015] (3) Add high-entropy alloy particles (micron-sized) to the mixed slurry B. The amount added is 5% to 50% (weight percentage) of the hydroxyl silicone oil modified bisphenol A epoxy resin. Stir evenly and grind to obtain epoxy resin coating material.

[0016] The high-entropy alloy is a CrFeCoNi single-phase FCC structure high-entropy alloy.

[0017] Furthermore, in step (1), the metal oxide is titanium dioxide with a particle size of 50 nm and an addition amount of 2.5%.

[0018] Furthermore, in step (2), the solid lubricant is graphite with a particle size of 1 μm and an addition amount of 2.5%.

[0019] Furthermore, in step (3), the amount of CrFeCoNi single-phase FCC structure high-entropy alloy added is 15%.

[0020] Furthermore, the CrFeCoNi single-phase FCC structure high-entropy alloy is prepared by the following method: Four metal powders, Cr, Fe, Co, and Ni, are taken in a molar ratio of 1:1:1:1; the metal powders are melted in an electric arc furnace: the furnace is evacuated until the vacuum degree reaches 1×10⁻⁶. -2 After Pa, the metal powder was melted at a temperature of 1900–2000 °C for 30 min; then, CrFeCoNi single-phase FCC structure high-entropy alloy powder was prepared using metal atomization technology.

[0021] Furthermore, the purity of the metal powder is ≥99.5%.

[0022] Furthermore, the specific method for preparing CrFeCoNi single-phase FCC structure high-entropy alloy powder using metal atomization technology is as follows: a nitrogen-argon mixed gas flow (the molar ratio of nitrogen to argon is 1:9) is used to impinge on the liquid metal, the superheat of the alloy is controlled at 100-250℃, and the pressure of the atomizing nozzle is 3-6MPa, thereby obtaining CrFeCoNi single-phase FCC structure high-entropy alloy powder.

[0023] Further, in step (1), the hydroxyl silicone oil modified bisphenol A epoxy resin is prepared by the following method: under a nitrogen atmosphere, the bisphenol A epoxy resin is heated to 100-180°C, stirred (1000-2000 r / min), and hydroxyl silicone oil is added during the stirring process. The mass ratio of bisphenol A epoxy resin to hydroxyl silicone oil is 4:1. Then, 0.1%-2.0% (by weight, based on the total weight of bisphenol A epoxy resin and hydroxyl silicone oil) of reaction catalyst is added, and the reaction is stirred for 0.5-12 h to obtain the hydroxyl silicone oil modified bisphenol A epoxy resin. The reaction catalyst is selected from dibutyltin dilaurate or stannous isooctanoate.

[0024] Furthermore, in steps (1), (2), and (3), the stirring speed is 1000–2000 r / min, and a vacuum high-speed mixer can be used. Even further, the stirring speed is 1500 r / min, and the stirring time is 10 min.

[0025] Furthermore, in steps (1), (2), and (3), a three-roll mill is used for grinding. In step (1), the grinding spacing is 5-10 μm and the rotation speed is 300 r / min; in step (2), the grinding spacing is 5-10 μm and the rotation speed is 300 r / min; in step (3), the grinding spacing is 40-60 μm and the rotation speed is 300 r / min.

[0026] The epoxy resin coating material prepared by the above method is used in the preparation of wear-resistant coatings. In specific applications, it is coated on the surface of the workpiece and cured.

[0027] Furthermore, in specific applications, an epoxy resin low-temperature curing agent is added to the epoxy resin coating material, followed by dilution with a thinner, and then it is applied to the surface of the workpiece.

[0028] Furthermore, the epoxy resin low-temperature curing agent is selected from any one of amine curing agents, acid anhydride curing agents, or amide curing agents, and its content is determined according to the actual amount of epoxy resin.

[0029] Furthermore, the diluent is selected from any one or more of acetone, ethanol, n-butanol, and xylene.

[0030] The epoxy resin coating material of this invention is a three-scale polymer coating composite material of "large micron-submicron-nano" coupled with high-entropy alloy particles, solid lubricant and metal compound particles in hydroxyl silicone oil modified bisphenol A type epoxy resin. The hydroxyl silicone oil modified bisphenol A type epoxy resin can provide friction reduction and wear resistance under lean oil or even dry friction conditions by relying on the self-lubricating properties of the epoxy resin itself and the dual lubrication mode of releasing silicone oil. The addition of micron-level high-entropy alloy can significantly improve the reinforcing effect of bisphenol A type epoxy resin. The addition of submicron-level solid lubricant and nano-level metal oxide particles can synergistically improve the wear resistance and lubrication performance of the composite material, and solve the friction and wear problems under lean oil and dry friction conditions before the transfer film is formed.

[0031] The method for preparing the epoxy resin coating material of this invention involves chemically grafting and modifying bisphenol A type epoxy resin, coupling high-entropy alloy particles, solid lubricants, and metal compound particles into the modified matrix to prepare a three-scale epoxy resin composite material of "large micron-submicron-nano". The filler is uniformly dispersed in the resin matrix to form a polymer slurry through vacuum high-speed stirring and three-roll milling techniques. In practical applications, the slurry is coated onto the surface of a workpiece and cured to obtain an epoxy resin-based wear-resistant material with a low coefficient of friction and wear rate, exhibiting excellent wear resistance and lubrication properties, suitable for high-speed, high-load conditions with lean oil lubrication. Attached Figure Description

[0032] Figure 1: Bar chart of friction coefficient under high speed and high load conditions with lean oil.

[0033] Figure 2 Wear rate bar chart under high speed and high load conditions with lean oil. Detailed Implementation

[0034] The present invention will be further described below with reference to embodiments. However, the scope of the present invention is not limited to the following embodiments. Those skilled in the art will understand that various changes and modifications can be made to the present invention without departing from the spirit and scope thereof.

[0035] Unless otherwise specified, the instruments, reagents, and materials used in the following embodiments are all conventional instruments, reagents, and materials already available in the prior art and can be obtained through legitimate commercial channels. Unless otherwise specified, the experimental methods and detection methods used in the following embodiments are all conventional experimental methods and detection methods already available in the prior art.

[0036] The bisphenol A type epoxy resin used in this invention is readily available through commercial purchase and is sourced from Nantong Xingchen WSR6101.

[0037] The PA650 curing agent used in this invention is readily available through commercial purchase and was purchased from Dingyuan County Danbao Resin Co., Ltd.

[0038] The hydroxyl silicone oil used in this invention is commercially available and is purchased from Dow Corning PMX-0156.

[0039] Comparative Example 1: Preparation of Bisphenol A Type Epoxy Resin Coating

[0040] Bisphenol A type epoxy resin and PA650 curing agent were mixed at a mass ratio of 5:4, and diluted with a n-butanol-xylene mixed solution (the mass ratio of n-butanol to xylene was 4:1) to a viscosity of 1000 cps.

[0041] Preparation of 2-hydroxyl silicone oil modified bisphenol A type epoxy resin coating (comparative example)

[0042] The steps are as follows:

[0043] (1) Take bisphenol A type epoxy resin and put it into a four-necked flask containing a constant pressure feeding funnel, thermometer and condenser. Under nitrogen atmosphere, heat the bisphenol A type epoxy resin to 160℃ and stir at 1000r / min. During the stirring process, add hydroxyl silicone oil. The mass ratio of bisphenol A type epoxy resin to hydroxyl silicone oil is 4:1. After stirring evenly, add 0.3% dibutyltin dilaurate as a reaction catalyst (0.3% means that the amount of reaction catalyst added is 0.3% of the total weight of bisphenol A type epoxy resin and hydroxyl silicone oil). Stir and react for 4h to obtain hydroxyl silicone oil modified bisphenol A type epoxy resin.

[0044] (2) The hydroxyl silicone oil modified bisphenol A epoxy resin and PA650 curing agent were mixed at a mass ratio of 5:4 and diluted with n-butanol-xylene mixed solution to a viscosity of 1000cps.

[0045] Comparative Example 3: Preparation of Bisphenol A Type Epoxy Resin Coating Modified with High-Entropy Alloy Filled with Hydroxyl Silicone Oil

[0046] The steps are as follows:

[0047] (1) Preparation of hydroxyl silicone oil modified bisphenol A type epoxy resin

[0048] Same as step (1) of Comparative Example 2.

[0049] (2) Preparation of CrFeCoNi single-phase FCC structure high-entropy alloy

[0050] Four metal powders—Cr, Fe, Co, and Ni (with a purity ≥ 99.5%)—were used, with a molar ratio of 1:1:1:1. The metal powders were then smelted in an electric arc furnace. The furnace was evacuated until the vacuum level reached 1 × 10⁻⁶. -2 After Pa, the metal powder was melted at 1950℃ for 30 min. Then, CrFeCoNi single-phase FCC structure high-entropy alloy powder was prepared using metal atomization technology: a nitrogen-argon mixed gas flow (nitrogen and argon molar ratio of 1:9) was used to impinge the molten metal, the superheat of the alloy was controlled at 150℃, and the pressure of the atomizing nozzle was 5 MPa, thus obtaining CrFeCoNi single-phase FCC structure high-entropy alloy powder. The particle size was measured to be 20-25 μm.

[0051] (3) Add micron-sized high-entropy alloy particles (i.e., the CrFeCoNi single-phase FCC structure high-entropy alloy prepared above) to the hydroxyl silicone oil modified bisphenol A type epoxy resin. The amount of micron-sized high-entropy alloy particles added is 15% of the mass of the hydroxyl silicone oil modified bisphenol A type epoxy resin. Stir at 1500 r / min for 10 min using the dispersion disc of a vacuum high-speed mixer. The micron-sized high-entropy alloy particles and the resin matrix form a uniform mixed slurry.

[0052] The mixed slurry was poured into a three-roll mill for dispersion and grinding, with a grinding spacing of 50 μm and a rotation speed of 300 r / min.

[0053] (4) Mix the above-ground slurry with PA650 curing agent at a mass ratio of 5:4, and dilute with n-butanol-xylene mixed solution to a viscosity of about 1000cps.

[0054] Example 1: Preparation of a high-entropy alloy / graphite-filled hydroxyl silicone oil-modified bisphenol A epoxy resin coating

[0055] The steps are as follows:

[0056] (1) Preparation of hydroxyl silicone oil modified bisphenol A type epoxy resin

[0057] Same as step (1) of Comparative Example 2.

[0058] (2) Preparation of CrFeCoNi single-phase FCC structure high-entropy alloy

[0059] Same as step (2) of Comparative Example 3.

[0060] (3) Add graphite with a particle size of 1 μm to the hydroxyl silicone oil modified bisphenol A epoxy resin. The amount of graphite added is 5% of the mass of the hydroxyl silicone oil modified bisphenol A epoxy resin. Use the dispersion plate of a vacuum high-speed mixer to stir at a speed of 1500 r / min for 10 min. The graphite and the resin matrix form a uniform mixed slurry.

[0061] The mixed slurry was poured into a three-roll mill for dispersion and grinding, with a grinding spacing of 10 μm and a rotation speed of 300 r / min.

[0062] (4) Add micron-sized high-entropy alloy particles to the mixed slurry ground in (3) above. The amount of micron-sized high-entropy alloy particles added is 15%. Use the dispersion disc of a vacuum high-speed mixer to stir at a speed of 1500 r / min for 10 min. The micron-sized high-entropy alloy particles and the resin matrix form a uniform mixed slurry.

[0063] The mixed slurry was poured into a three-roll mill for dispersion and grinding, with a grinding spacing of 50 μm and a rotation speed of 300 r / min.

[0064] (5) Mix the ground slurry from (4) above with PA650 curing agent at a mass ratio of 5:4, and dilute with n-butanol-xylene mixed solution to a viscosity of 1000cps.

[0065] Example 2: Preparation of a high-entropy alloy / titanium dioxide-filled hydroxyl silicone oil-modified bisphenol A epoxy resin coating

[0066] The steps are as follows:

[0067] (1) Preparation of hydroxyl silicone oil modified bisphenol A type epoxy resin

[0068] Same as step (1) of Comparative Example 2.

[0069] (2) Preparation of CrFeCoNi single-phase FCC structure high-entropy alloy

[0070] Same as step (2) of Comparative Example 3.

[0071] (3) Add titanium dioxide with a particle size of 50 nm to the hydroxyl silicone oil modified bisphenol A epoxy resin. The amount of titanium dioxide added is 5% of the mass of the hydroxyl silicone oil modified bisphenol A epoxy resin. Use the dispersion plate of a vacuum high-speed mixer to stir at a speed of 1500 r / min for 10 min. The titanium dioxide and the resin matrix form a uniform mixed slurry.

[0072] The mixed slurry was poured into a three-roll mill for dispersion and grinding, with a grinding spacing of 10 μm and a rotation speed of 300 r / min.

[0073] (4) Add micron-sized high-entropy alloy particles to the mixed slurry ground in (3) above. The amount of micron-sized high-entropy alloy particles added is 15%. Use the dispersion disc of a vacuum high-speed mixer to stir at a speed of 1500 r / min for 10 min. The micron-sized high-entropy alloy particles and the resin matrix form a uniform mixed slurry.

[0074] The mixed slurry was poured into a three-roll mill for dispersion and grinding, with a grinding spacing of 50 μm and a rotation speed of 300 r / min.

[0075] (5) Mix the ground slurry from (4) above with PA650 curing agent at a mass ratio of 5:4, and dilute with n-butanol-xylene mixed solution to a viscosity of 1000cps.

[0076] Example 3: Preparation of a high-entropy alloy / graphite / titanium dioxide-filled hydroxyl silicone oil-modified bisphenol A type epoxy resin coating

[0077] The steps are as follows:

[0078] (1) Preparation of hydroxyl silicone oil modified bisphenol A type epoxy resin

[0079] Same as step (1) of Comparative Example 2.

[0080] (2) Preparation of CrFeCoNi single-phase FCC structure high-entropy alloy

[0081] Same as step (2) of Comparative Example 3.

[0082] (3) Add titanium dioxide with a particle size of 50 nm to hydroxyl silicone oil modified bisphenol A epoxy resin. The amount of titanium dioxide added is 2.5% of the mass of hydroxyl silicone oil modified bisphenol A epoxy resin. Use the dispersion plate of a vacuum high-speed mixer to stir at a speed of 1500 r / min for 10 min. The titanium dioxide and the resin matrix form a uniform mixed slurry A.

[0083] The mixed slurry A was poured into a three-roll mill for dispersion and grinding, with a grinding spacing of 10 μm and a rotation speed of 300 r / min.

[0084] (4) Add graphite with a particle size of 1 μm to the mixed slurry A after grinding in (3) above. The amount of graphite added is 2.5% of the mass of hydroxyl silicone oil modified bisphenol A type epoxy resin. Use the dispersion plate of a vacuum high-speed mixer to stir at a speed of 1500 r / min for 10 min. The graphite and the resin matrix form a uniform mixed slurry B.

[0085] The mixed slurry B was poured into a three-roll mill for dispersion and grinding, with a grinding spacing of 10 μm and a rotation speed of 300 r / min.

[0086] (5) Add micron-sized high-entropy alloy particles to the mixed slurry B after grinding in (4) above. The amount of micron-sized high-entropy alloy particles added is 15%. Use the dispersion plate of a vacuum high-speed mixer to stir at a speed of 1500r / min for 10min. The micron-sized high-entropy alloy particles and the resin matrix form a uniform mixed slurry C.

[0087] The mixed slurry C was poured into a three-roll mill for dispersion and grinding, with a grinding spacing of 50 μm and a rotation speed of 300 r / min.

[0088] (6) Mix the ground slurry C from (5) with PA650 curing agent at a mass ratio of 5:4, and dilute with n-butanol-xylene mixed solution to a viscosity of 1000cps.

[0089] Experiment 1 Performance Testing

[0090] The epoxy resin coating slurries obtained from Comparative Examples 1, 2, 3, 1, 2, and 3 were diluted with PA650 curing agent to a viscosity of 1000 cps. The diluted coating was then sprayed onto the surface of an aluminum alloy (GB5052) sheet using a spray gun. The compressed air pressure of the spray gun was 0.3 MPa. The thickness of the cured coating was 80 μm, the curing temperature was 65°C, and the curing time was 4 h.

[0091] The friction and wear performance was verified using a ring-block friction and wear testing machine, specifically a high-speed ring-block testing machine. The mating component was a GCr15 steel ring (the surface of the GCr15 steel ring was pre-polished with 1000-grit wet sandpaper to remove the oxide layer), with a radius of 30 mm and a height of 25 mm. The coated aluminum block measured 50 mm × 10 mm × 4 mm. The test conditions were: load 300 N, speed 1 m / s, test duration 120 min, and lubricating medium 1 mL of PAO4 base lubricating oil.

[0092] After the friction and wear test, the width of the wear track was measured using an optical microscope, and the wear rate was calculated using a formula.

[0093] The formula for calculating the wear rate is:

[0094]

[0095] Where L′ is the width of the sample (mm), R is the diameter of the paired steel ring (mm), W is the width of the wear mark (mm), F is the force applied in the normal direction (N), and L is the sliding distance (m).

[0096] Three parallel experiments were conducted, and the average value of the results was taken. The histogram of friction coefficients under lean oil conditions at high speed and high load is shown below. Figure 1 As shown in the bar chart, the wear rate under high speed and high load conditions with lean oil is as follows: Figure 2 As shown in Table 1, the data is as follows.

[0097] Table 1. Coefficient of kinetic friction and wear rate

[0098]

[0099]

[0100] Referring to Table 1, it can be seen from Comparative Examples 1, 2, and 3 that modification with hydroxyl silicone oil and the addition of high-entropy alloy powder can effectively reduce the friction coefficient and wear rate of epoxy resin. The reason for this may be that silicone oil-modified bisphenol A epoxy resin can provide friction reduction and wear resistance under lean or even dry friction conditions by relying on the self-lubricating properties of the epoxy resin itself and the dual lubrication mechanism of releasing silicone oil. Furthermore, the addition of micron-sized high-entropy alloy can significantly enhance the reinforcing effect of bisphenol A epoxy resin.

[0101] Examples 1, 2, and 3, using Comparative Example 3 as a reference, investigated the tribological properties of bisphenol A epoxy resin coatings modified with hydroxyl silicone oil filled with high-entropy alloys when graphite, titanium dioxide, and graphite / titanium dioxide were added individually or simultaneously. It can be seen that adding graphite alone only slightly reduces the coefficient of friction and wear rate of the coating; adding titanium dioxide alone does not significantly change the wear rate, but the coefficient of friction increases to some extent; while adding graphite / titanium dioxide simultaneously further reduces both the coefficient of friction and wear rate. This indicates that the addition of submicron-sized solid lubricants and nano-sized metal oxide particles can synergistically improve the wear resistance and lubrication performance of the composite material, solving the tribological wear problems of lean oil and dry friction conditions before the transfer film forms.

[0102] In summary, the "large micron-submicron-nano" three-scale epoxy resin coating of the present invention exhibits excellent performance. By coupling high-entropy alloy particles, solid lubricants, and metal compound particles in the modified matrix, the friction and wear performance of the coated product can be greatly improved.

[0103] The above embodiments are provided to those skilled in the art to fully disclose and describe how the claimed implementations can be carried out and used, and are not intended to limit the scope of the disclosure herein. Modifications that will be obvious to those skilled in the art will be within the scope of the appended claims.

Claims

1. A method for preparing an epoxy resin coating material suitable for high-load, high-speed operation under lean-oil lubrication conditions, characterized in that, Includes the following steps: (1) Add titanium dioxide with a particle size of 50 nm to hydroxyl silicone oil modified bisphenol A epoxy resin. The amount added is 2.5% of the hydroxyl silicone oil modified bisphenol A epoxy resin. Stir evenly and grind to obtain mixed slurry A. (2) Add graphite with a particle size of 1 μm to the mixed slurry A. The amount added is 2.5% of the hydroxyl silicone oil modified bisphenol A type epoxy resin. Stir evenly and grind to obtain mixed slurry B. (3) Add a high-entropy alloy with a particle size of 20-25 μm to the mixed slurry B. The amount added is 15% of the hydroxyl silicone oil modified bisphenol A type epoxy resin. Stir evenly and grind to obtain epoxy resin coating material. The high-entropy alloy is a CrFeCoNi single-phase FCC structure high-entropy alloy. The CrFeCoNi single-phase FCC high-entropy alloy was prepared by the following method: Four metal powders, Cr, Fe, Co, and Ni, were taken in a molar ratio of 1:1:1:1; the metal powders were melted in an electric arc furnace; the furnace was evacuated until the vacuum level reached 1×10⁻⁶. -2 After Pa, the metal powder was melted at a temperature of 1900–2000 °C for 30 min; then, CrFeCoNi single-phase FCC structure high-entropy alloy powder was prepared using metal atomization technology. In step (1), the hydroxyl silicone oil modified bisphenol A epoxy resin is prepared by the following method: under a nitrogen atmosphere, the bisphenol A epoxy resin is heated to 100-180°C, stirred, and hydroxyl silicone oil is added during the stirring process. The mass ratio of bisphenol A epoxy resin to hydroxyl silicone oil is 4:

1. Then, 0.1%-2.0% of the reaction catalyst is added, and the reaction is stirred for 0.5-12 h to obtain the hydroxyl silicone oil modified bisphenol A epoxy resin. The reaction catalyst is selected from dibutyltin dilaurate or stannous isooctanoate.

2. The method for preparing the epoxy resin coating material suitable for high-load, high-speed operation with lean oil lubrication according to claim 1, characterized in that: The purity of the metal powder is ≥99.5%; The specific method for preparing CrFeCoNi single-phase FCC structure high-entropy alloy powder using metal atomization technology is as follows: a nitrogen-argon mixed gas flow is used to impinge on the liquid metal, the superheat of the alloy is controlled at 100-250℃, and the pressure of the atomizing nozzle is 3-6 MPa, thereby obtaining CrFeCoNi single-phase FCC structure high-entropy alloy powder.

3. The method for preparing the epoxy resin coating material suitable for high-load, high-speed operation with lean oil lubrication according to claim 1, characterized in that: In steps (1), (2), and (3), the stirring speed is 1500 r / min and the stirring time is 10 min; In steps (1), (2), and (3), a three-roll mill is used for grinding. In step (1), the grinding spacing is 5-10 μm and the rotation speed is 300 r / min. In step (2), the grinding spacing is 5-10 μm and the rotation speed is 300 r / min. In step (3), the grinding spacing is 40-60 μm and the rotation speed is 300 r / min.

4. The epoxy resin coating material prepared by the preparation method of the epoxy resin coating material suitable for lean oil lubrication high load and high speed working conditions according to any one of claims 1 to 3.

5. The application of the epoxy resin coating material according to claim 4 in the preparation of wear-resistant coatings.

6. The application according to claim 5, characterized in that: In a specific application, an epoxy resin curing agent, specifically PA650 curing agent, is added to the epoxy resin coating material, then diluted with a diluent, and finally coated onto the surface of the workpiece.

7. The application according to claim 6, characterized in that: The diluent is selected from any one or more of acetone, ethanol, n-butanol, and xylene.

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