Graphite-based high-temperature lubricant composition and preparation method thereof

Abstract

The invention relates to a graphite-based high-temperature lubricant composition and a preparation method thereof, and belongs to the technical field of lubricants. The composition is prepared from the following components: 30 to 38 weight percent of graphite powder, 4.2 to 5.5 weight percent of interface modifier, 1.9 to 2.6 weight percent of thickening agent, 0.3 to 0.4 weight percent of defoaming agent, 0.12 to 0.17 weight percent of antirust agent and the balance of water, according to the interface modifier, 3-chloropropyltriethoxysilane and diallylamine are substituted to prepare an intermediate, then the intermediate, divinyltetramethyldisiloxane and bis (2-mercaptoethyl) thioether are subjected to an addition reaction to prepare a modified matrix, and finally, the modified matrix is subjected to quaternization treatment through 3-bromo-1-propanol. The introduction of the interface modifier overcomes the problems of dispersibility and surface adaptability of the water-based graphite lubricant, and provides key technical support for green manufacturing.

Description

Technical Field

[0001] The present invention belongs to the technical field of lubricants, and in particular, relates to a graphite-based high-temperature lubricant composition and a preparation method thereof. Background Art

[0002] Graphite is widely used in hot rolling, drawing, and other semi-finished metal processing due to its layered structure and high-temperature stability. Water-based graphite lubricants are gradually replacing oil-based systems due to their environmental friendliness and excellent cooling properties. However, existing technologies have two core drawbacks: Insufficient dispersibility: The smaller the graphite particle size, the easier it is to form a uniform lubricating layer. However, the use of micron-sized graphite powder will lead to severe agglomeration due to its large specific surface area. Uneven lubrication: The surface roughness of metal semi-finished products is relatively large, with a large number of protrusions and depressions. Graphite particles find it difficult to penetrate into defective areas, resulting in insufficient local lubrication, which leads to direct metal contact during processing and causes adhesive wear.

[0003] In the existing technology, ionic dispersants (such as cationic quaternary ammonium salts and anionic sulfonates) are generally used to improve the dispersibility of graphite particles and thus enhance the uniformity of the lubricating layer. However, existing ionic dispersants can only enhance the overall electrostatic repulsion of the lubricant, resulting in a large dosage. Moreover, under the influence of the electrostatic repulsion, the graphite particles have difficulty forming a stable lubricating layer on the substrate surface, which weakens the advantages brought by the improved uniformity and seriously restricts the development of graphite-based high-temperature lubricants. Summary of the Invention

[0004] In order to solve the technical problems mentioned in the background technology, the purpose of the present invention is to provide a graphite-based high-temperature lubricant composition and a preparation method thereof.

[0005] The purpose of the present invention can be achieved through the following technical solutions: A graphite-based high-temperature lubricant composition comprises the following components: 30-38 wt% graphite powder, 4.2-5.5 wt% interfacial modifier, 1.9-2.6 wt% thickener, 0.3-0.4 wt% defoamer, 0.12-0.17 wt% rust inhibitor, and the balance water.

[0006] The interface modifier is prepared by the following method: Step A1: 3-chloropropyltriethoxysilane was mixed with diallylamine and anhydrous toluene, and dry nitrogen was introduced. Potassium iodide was added and mixed again. The mixture was heated to 60-70°C and stirred for 4-5.5 hours. After the reaction was completed, the toluene was removed by vacuum rotary evaporation to obtain an intermediate. Furthermore, the usage ratio of 3-chloropropyltriethoxysilane, diallylamine, potassium iodide and anhydrous toluene is 0.1 mol: 0.11-0.12 mol: 0.15-0.2 g: 220-280 mL. Potassium iodide is used as a catalyst to promote the substitution reaction between 3-chloropropyltriethoxysilane and diallylamine. The specific reaction route is:

[0007] Step A2: Mix the intermediate, divinyltetramethyldisiloxane, photoinitiator and anhydrous tetrahydrofuran, pass dry nitrogen gas into the mixture, and apply 30-40 mW / cm 2 Under ultraviolet irradiation, slowly add bis(2-mercaptoethyl) sulfide diluted in acetone and stir to react for 8-10 hours. After the reaction is completed, remove tetrahydrofuran by rotary evaporation to obtain a modified matrix; Furthermore, the amount ratio of bis(2-mercaptoethyl) sulfide, intermediate, divinyltetramethyldisiloxane, photoinitiator and anhydrous tetrahydrofuran is 0.1 mol: 25-40 mmol: 60-80 mmol: 0.17-0.21 g: 350-420 mL. Under photoinitiation, the intermediate reacts with divinyltetramethyldisiloxane and bis(2-mercaptoethyl) sulfide to form a block polymer. The specific reaction route is:

[0008] Step A3: Mix the modified substrate, 3-bromo-1-propanol, tetrabutylammonium bromide, and anhydrous dioxane, introduce dry nitrogen protection, heat to 90-100°C, and reflux for 12-15 hours. After the reaction is complete, remove the dioxane by rotary evaporation. Cool to room temperature, add ice water to wash, separate the aqueous phase, and vacuum dry to obtain an interfacial modifier. Furthermore, the modified substrate, 3-bromo-1-propanol, tetrabutylammonium bromide and anhydrous dioxane are used in a ratio of 50 g:14-22 mL:0.3-0.4 g:110-150 mL, and 3-bromo-1-propanol undergoes a quaternization reaction with the tertiary amine in 3-bromo-1-propanol. The specific reaction route is:

[0009] Preferably, the graphite powder is a micron-sized powder with an average particle size controlled within the range of 1-5 μm. Graphite powder of this specification has excellent lubricity and can be effectively dispersed under the action of an interfacial modifier to achieve a good lubrication effect.

[0010] Preferably, the thickener is sodium carboxymethyl cellulose, which has a good dispersing and thickening effect in an aqueous system, is suitable for adjusting the state of the composition, and is conducive to the lubrication of the lubricant matching different processing surfaces.

[0011] Preferably, the defoaming agent is polyether-modified silicone oil, which has a good defoaming effect on aqueous systems and has good thermal stability.

[0012] A method for preparing a graphite-based high-temperature lubricant composition comprises the following steps: premixing an interface modifier, a defoamer, and water, adding graphite powder, mixing, and heating, grinding and dispersing the mixture, and then sequentially adding a rust inhibitor and a thickener and mixing evenly to obtain the lubricant composition.

[0013] Beneficial effects of the present invention: The present invention uses graphite as a lubricating material and introduces an interface modifier to prepare a water-based composition. The interface modifier is substituted by 3-chloropropyltriethoxysilane and the secondary amine in diallylamine to form an intermediate containing a double branched double bond. Then, the intermediate, divinyltetramethyldisiloxane and bis(2-mercaptoethyl)sulfide are added under ultraviolet light through the double bond and the mercapto group to form a chain polymer, which is a modified matrix. Finally, 3-bromo-1-propanol is reacted with the tertiary amine structure in the modified matrix for quaternization. Compared with existing graphite-based lubricants, the present invention has the following advantages: 1. The quaternary ammonium structure containing hydroxyl groups in the interface modifier molecule has good hydrophilicity and can have good dispersibility in the aqueous matrix, and is suitable for environmentally friendly aqueous systems; 2. The interface modifier has a macromolecular structure, and an organic silicon structure is introduced into the chain, which has good thermal stability and is compatible with high-temperature lubrication environments. Matching; 3. The ethoxysilane on the side chain of the interface modifier molecule is coupled with graphite. On the one hand, surface cationic modification is introduced to avoid the agglomeration of graphite particles in the water-based system. On the other hand, the sulfur-nitrogen chain segments obtained by addition to the molecular chain form a chelating effect, thereby carrying the graphite particles to closely adhere to the surface of the workpiece, especially at the surface defects of the workpiece, with more active chelating sites, thereby ensuring sufficient lubrication at the defects. In addition, the low rotation barrier of the sulfide segment causes it to undergo conformational transition under the action of friction shear force, absorb vibration energy, and reduce interfacial stress concentration. During local high-temperature friction, the sulfur atoms in the sulfide structure react with the metal surface to form sulfide derivatives, which cooperate with graphite to form a "graphite-sulfide derivative" gradient transfer film, significantly reducing shear resistance and forming a synergistic lubrication effect, thereby ensuring stable lubrication effect at high temperatures. DETAILED DESCRIPTION

[0014] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0015] Example 1: Preparation of a graphite-based high-temperature lubricant composition. The specific implementation process is as follows: (1) Preparation of interfacial modifier Step A1: Mix 3-chloropropyltriethoxysilane with diallylamine and anhydrous toluene, introduce dry nitrogen protection, add potassium iodide and mix again, heat to 70°C and stir to react for 4 hours, wherein the amount ratio of 3-chloropropyltriethoxysilane, diallylamine, potassium iodide and anhydrous toluene is 0.1 mol: 0.12 mol: 0.2 g: 280 mL. After the reaction is completed, remove toluene by vacuum rotary evaporation to obtain an intermediate.

[0016] Step A2: Mix the intermediate, divinyltetramethyldisiloxane, photoinitiator and anhydrous tetrahydrofuran, pass dry nitrogen gas into the mixture, and apply 40mW / cm 2 Under ultraviolet irradiation, bis(2-mercaptoethyl) sulfide and acetone were prepared into a dilution with a mass fraction of 10%, and the acetone dilution of bis(2-mercaptoethyl) sulfide was slowly added and stirred for reaction for 8 hours. Among them, the photoinitiator used was photoinitiator 1173, and the irradiation was carried out with a medium-pressure mercury lamp. The amount ratio of bis(2-mercaptoethyl) sulfide, intermediate, divinyltetramethyldisiloxane, photoinitiator and anhydrous tetrahydrofuran was 0.1 mol: 40 mmol: 60 mmol: 0.21 g: 420 mL. After the reaction was completed, the tetrahydrofuran was removed by rotary evaporation to obtain a modified matrix.

[0017] Step A3: Take the modified substrate, 3-bromo-1-propanol, tetrabutylammonium bromide and anhydrous dioxane, mix them, introduce dry nitrogen protection, heat to 100°C and reflux for 12 hours, wherein the amount ratio of the modified substrate, 3-bromo-1-propanol, tetrabutylammonium bromide and anhydrous dioxane is 50g:22mL:0.4g:150mL. After the reaction is completed, remove the dioxane by rotary evaporation, cool to room temperature, add ice water to wash, separate the aqueous phase and vacuum dry to obtain an interfacial modifier.

[0018] (2) Preparation of lubricant composition The raw materials are calculated by weight percentage: 38wt% graphite powder, using LF-SM-W003 type micron-grade powder with an average particle size of 3μm; 5.5wt% interface modifier, homemade in this embodiment; 2.6wt% thickener, using industrial-grade sodium carboxymethyl cellulose; 0.3wt% defoamer, using commercially available THIX-299 type polyether-modified silicone oil preparation; 0.12wt% rust inhibitor, using commercially available DX309 type water-based preparation; the balance is water; The above-mentioned interfacial modifier, defoamer and water were pre-mixed for 5 minutes, and graphite powder was added and stirred. At the same time, the mixed system was heated to 60°C, and then added to a grinder for grinding and dispersion. Finally, the rust inhibitor was added in sequence and stirred to obtain a lubricant composition.

[0019] Example 2: Preparation of a graphite-based high-temperature lubricant composition. The specific implementation process is as follows: (1) Preparation of interfacial modifier Step A1: Mix 3-chloropropyltriethoxysilane with diallylamine and anhydrous toluene, introduce dry nitrogen protection, add potassium iodide and mix again, heat to 60°C and stir to react for 5.5 hours, wherein the amount ratio of 3-chloropropyltriethoxysilane, diallylamine, potassium iodide and anhydrous toluene is 0.1 mol: 0.11 mol: 0.15 g: 220 mL. After the reaction is completed, remove toluene by vacuum rotary evaporation to obtain an intermediate.

[0020] Step A2: Mix the intermediate, divinyltetramethyldisiloxane, photoinitiator and anhydrous tetrahydrofuran, pass dry nitrogen gas into the mixture, and apply 30mW / cm 2 Under ultraviolet irradiation, bis(2-mercaptoethyl) sulfide and acetone were prepared into a dilution with a mass fraction of 10%, and the acetone dilution of bis(2-mercaptoethyl) sulfide was slowly added and stirred for 10 hours. Among them, the photoinitiator used was photoinitiator 1173, and the irradiation was carried out with a medium-pressure mercury lamp. The amount ratio of bis(2-mercaptoethyl) sulfide, intermediate, divinyltetramethyldisiloxane, photoinitiator and anhydrous tetrahydrofuran was 0.1 mol: 25 mmol: 80 mmol: 0.17 g: 350 mL. After the reaction was completed, the tetrahydrofuran was removed by rotary evaporation to obtain a modified matrix.

[0021] Step A3: Take the modified substrate, 3-bromo-1-propanol, tetrabutylammonium bromide and anhydrous dioxane, mix them, introduce dry nitrogen protection, heat to 90°C and reflux for 15 hours, wherein the amount ratio of the modified substrate, 3-bromo-1-propanol, tetrabutylammonium bromide and anhydrous dioxane is 50g:14mL:0.3g:110mL. After the reaction is completed, remove the dioxane by rotary evaporation, cool to room temperature, add ice water to wash, separate the aqueous phase and vacuum dry to obtain an interfacial modifier.

[0022] (2) Preparation of lubricant composition The raw materials are taken in percentage by weight: 30wt% graphite powder, using LF-SM-W001 type micron-grade powder with an average particle size of 1μm; 4.2wt% interface modifier, homemade in this embodiment; 1.9wt% thickener, using industrial-grade sodium carboxymethyl cellulose; 0.4wt% defoamer, using commercially available THIX-299 type polyether-modified silicone oil preparation; 0.17wt% rust inhibitor, using commercially available DX309 type water-based preparation; the balance is water; The above-mentioned interfacial modifier, defoamer and water were pre-mixed for 5 minutes, and graphite powder was added and stirred. At the same time, the mixed system was heated to 60°C, and then added to a grinder for grinding and dispersion. Finally, the rust inhibitor was added in sequence and stirred to obtain a lubricant composition.

[0023] Example 3, preparing a graphite-based high-temperature lubricant composition, the specific implementation process is as follows: (1) Preparation of interfacial modifier Step A1: 3-chloropropyltriethoxysilane is mixed with diallylamine and anhydrous toluene, and dry nitrogen is introduced for protection. Potassium iodide is added and mixed again, and the mixture is heated to 70°C and stirred for 4.5 hours. The ratio of 3-chloropropyltriethoxysilane, diallylamine, potassium iodide and anhydrous toluene is 0.1 mol: 0.12 mol: 0.18 g: 260 mL. After the reaction is completed, the toluene is removed by vacuum rotary evaporation to obtain an intermediate.

[0024] Step A2: Mix the intermediate, divinyltetramethyldisiloxane, photoinitiator and anhydrous tetrahydrofuran, pass dry nitrogen gas into the mixture, and apply 40mW / cm 2 Under ultraviolet irradiation, bis(2-mercaptoethyl) sulfide and acetone were prepared into a dilution with a mass fraction of 10%, and the acetone dilution of bis(2-mercaptoethyl) sulfide was slowly added and stirred for reaction for 8.5 hours. Among them, the photoinitiator used was photoinitiator 1173, and the irradiation was performed with a medium-pressure mercury lamp. The amount ratio of bis(2-mercaptoethyl) sulfide, intermediate, divinyltetramethyldisiloxane, photoinitiator and anhydrous tetrahydrofuran was 0.1 mol: 30 mmol: 75 mmol: 0.2 g: 400 mL. After the reaction was completed, the tetrahydrofuran was removed by rotary evaporation to obtain a modified matrix.

[0025] Step A3: Take the modified substrate, 3-bromo-1-propanol, tetrabutylammonium bromide and anhydrous dioxane, mix them, introduce dry nitrogen protection, heat to 95°C and reflux for 13 hours, wherein the amount ratio of the modified substrate, 3-bromo-1-propanol, tetrabutylammonium bromide and anhydrous dioxane is 50g:18mL:0.4g:120mL. After the reaction is completed, remove the dioxane by rotary evaporation, cool to room temperature, add ice water to wash, separate the aqueous phase and vacuum dry to obtain an interfacial modifier.

[0026] (2) Preparation of lubricant composition The raw materials are taken in percentage by weight: 36wt% graphite powder, using LF-SM-W003 type micron-grade powder with an average particle size of 3μm; 5.2wt% interface modifier, homemade in this embodiment; 2.5wt% thickener, using industrial-grade sodium carboxymethyl cellulose; 0.3wt% defoamer, using commercially available THIX-299 type polyether-modified silicone oil preparation; 0.13wt% rust inhibitor, using commercially available DX309 type water-based preparation; the balance is water; The above-mentioned interfacial modifier, defoamer and water were pre-mixed for 5 minutes, and graphite powder was added and stirred. At the same time, the mixed system was heated to 60°C, and then added to a grinder for grinding and dispersion. Finally, the rust inhibitor was added in sequence and stirred to obtain a lubricant composition.

[0027] Example 4: Preparation of a graphite-based high-temperature lubricant composition. The specific implementation process is as follows: (1) Preparation of interfacial modifier Step A1: Mix 3-chloropropyltriethoxysilane with diallylamine and anhydrous toluene, introduce dry nitrogen protection, add potassium iodide and mix again, heat to 65°C and stir to react for 5 hours, wherein the amount ratio of 3-chloropropyltriethoxysilane, diallylamine, potassium iodide and anhydrous toluene is 0.1 mol: 0.12 mol: 0.16 g: 250 mL. After the reaction is completed, remove toluene by vacuum rotary evaporation to obtain an intermediate.

[0028] Step A2: Mix the intermediate, divinyltetramethyldisiloxane, photoinitiator and anhydrous tetrahydrofuran, introduce dry nitrogen protection, and apply 35mW / cm 2 Under ultraviolet irradiation, bis(2-mercaptoethyl) sulfide and acetone were prepared into a dilution with a mass fraction of 10%, and the acetone dilution of bis(2-mercaptoethyl) sulfide was slowly added and stirred for 9.5 hours. Among them, the photoinitiator used was photoinitiator 1173, and the irradiation was performed with a medium-pressure mercury lamp. The amount ratio of bis(2-mercaptoethyl) sulfide, intermediate, divinyltetramethyldisiloxane, photoinitiator and anhydrous tetrahydrofuran was 0.1 mol: 35 mmol: 70 mmol: 0.18 g: 380 mL. After the reaction was completed, the tetrahydrofuran was removed by rotary evaporation to obtain a modified matrix.

[0029] Step A3: Take the modified substrate, 3-bromo-1-propanol, tetrabutylammonium bromide and anhydrous dioxane, mix them, introduce dry nitrogen protection, heat to 95°C and reflux for 13 hours, wherein the amount ratio of the modified substrate, 3-bromo-1-propanol, tetrabutylammonium bromide and anhydrous dioxane is 50g:20mL:0.35g:130mL. After the reaction is completed, the dioxane is removed by rotary evaporation, and the mixture is cooled to room temperature and washed with ice water. The aqueous phase is separated and vacuum dried to obtain an interfacial modifier.

[0030] (2) Preparation of lubricant composition The raw materials are taken in percentage by weight: 33wt% graphite powder, using LF-SM-W001 micron-grade powder with an average particle size of 1μm; 4.8wt% interface modifier, homemade in this embodiment; 2.1wt% thickener, using industrial-grade sodium carboxymethyl cellulose; 0.4wt% defoamer, using commercially available THIX-299 polyether-modified silicone oil preparation; 0.16wt% rust inhibitor, using commercially available DX309 water-based preparation; the balance is water; The above-mentioned interfacial modifier, defoamer and water were pre-mixed for 5 minutes, and graphite powder was added and stirred. At the same time, the mixed system was heated to 60°C, and then added to a grinder for grinding and dispersion. Finally, the rust inhibitor was added in sequence and stirred to obtain a lubricant composition.

[0031] Comparative Example 1, referring to Example 4, the interface modifier was replaced by 1.6 wt% of silane coupling agent KH-580 and 3.2 wt% of DA-168 quaternary ammonium salt dispersant, and the implementation process was exactly the same.

[0032] In comparative example 2, commercially available GC805 graphite lubricant was selected and diluted with deionized water to the same graphite content.

[0033] The fine-rolled TC4 titanium alloy plate was used as the wear substrate. The above lubricant was fed at 0.2 g / cm2. The friction coefficient was tested at 300°C according to ASTM D5707-23, and the wear rate was tested at 600°C according to GB / T 12444-2006. The load-bearing lubrication performance of the lubricant was tested according to GB / T 3142-2019. The specific test results are shown in Table 1: Table 1 μ(300℃) Δm (600℃) / % <![CDATA[P B / N]]> <![CDATA[P D / N]]> WSD / mm Example 1 0.26 0.12 1130 2820 0.33 Example 2 0.18 0.10 1020 2350 0.26 Example 3 0.23 0.15 1070 2690 0.35 Example 4 0.14 0.07 1110 2410 0.22 Comparative Example 1 0.47 0.19 940 1960 0.71 Comparative Example 2 0.51 0.24 980 2130 0.63 Note: μ-average friction coefficient, Δm-wear rate, P B - Maximum no-seizure load, P D - sintering load, WSD-wear scar diameter.

[0034] It can be seen from the test data in Table 1 that under the simulated high-temperature processing state, the test group using the embodiment as the lubricant has a lower friction coefficient and wear rate, showing an excellent high-temperature lubrication effect. In addition, in the four-ball load-bearing lubrication test, the sintering load of the embodiment is significantly higher than that of the comparative example. It can be analyzed that under high temperature and high load, the lubricating layer between the friction materials is more stable. Combined with the wear scar diameter, it can be seen that the wear scar is smaller and more uniform.

[0035] Throughout the specification, references to terms such as "one embodiment," "example," or "specific example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0036] The above contents are merely examples and explanations of the present invention. Those skilled in the art may make various modifications or additions to the described specific embodiments or replace them in similar ways. As long as they do not deviate from the invention or exceed the scope defined by the claims, they should all fall within the scope of protection of the present invention.

Claims

1. A graphite-based high-temperature lubricant composition, characterized in that The specific components are: graphite powder 30-38wt%, interface modifier 4.2-5.5wt%, thickener 1.9-2.6wt%, defoamer 0.3-0.4wt% and rust inhibitor 0.12-0.17wt%, and the balance is water; The interface modifier is prepared by the following method: Step A1: 3-chloropropyltriethoxysilane was mixed with diallylamine and anhydrous toluene, and dry nitrogen was introduced. Potassium iodide was added and mixed again. The mixture was heated to 60-70°C and stirred for 4-5.5 hours to prepare an intermediate. Step A2: Mix the intermediate, divinyltetramethyldisiloxane, photoinitiator and anhydrous tetrahydrofuran, pass dry nitrogen gas into the mixture, and apply 30-40 mW / cm 2 UV irradiation, slowly adding bis(2-mercaptoethyl) sulfide diluted in acetone and stirring for 8-10 hours to prepare a modified matrix; Step A3: Mix the modified substrate, 3-bromo-1-propanol, tetrabutylammonium bromide and anhydrous dioxane, introduce dry nitrogen protection, heat to 90-100° C. and reflux for reaction for 12-15 hours to prepare an interfacial modifier.

2. The graphite-based high-temperature lubricant composition according to claim 1, characterized in that: The usage ratio of 3-chloropropyltriethoxysilane, diallylamine, potassium iodide and anhydrous toluene is 0.1 mol: 0.11-0.12 mol: 0.15-0.2 g: 220-280 mL.

3. The graphite-based high-temperature lubricant composition according to claim 2, characterized in that: The usage ratio of bis(2-mercaptoethyl)sulfide, intermediate, divinyltetramethyldisiloxane, photoinitiator and anhydrous tetrahydrofuran is 0.1 mol: 25-40 mmol: 60-80 mmol: 0.17-0.21 g: 350-420 mL.

4. The graphite-based high-temperature lubricant composition according to claim 3, characterized in that: The usage ratio of the modified matrix, 3-bromo-1-propanol, tetrabutylammonium bromide and anhydrous dioxane is 50 g: 14-22 mL: 0.3-0.4 g: 110-150 mL.

5. The graphite-based high-temperature lubricant composition according to claim 1, characterized in that: The graphite powder is micron-sized powder with an average particle size of 1-5 μm.

6. The graphite-based high-temperature lubricant composition according to claim 1, characterized in that: The thickener is sodium carboxymethyl cellulose.

7. The graphite-based high-temperature lubricant composition according to claim 1, characterized in that: The defoaming agent is polyether modified silicone oil.

8. A method for preparing a graphite-based high-temperature lubricant composition according to any one of claims 1 to 7, characterized in that: Specifically, the interfacial modifier, defoamer and water are premixed, and then graphite powder is added, mixed and heated. After grinding and dispersion, the rust inhibitor and thickener are added in sequence and mixed to obtain the lubricant composition.

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