High temperature wheel belt lubricating oil and method of making same

Abstract

The application relates to the technical field of lubricating oil, in particular to high-temperature wheel belt lubricating oil and a preparation method thereof.The raw materials of the high-temperature wheel belt lubricating oil include the following components in parts by mass: poly-alpha-olefin 60-100 parts, nano-molybdenum disulfide 5-15 parts, dopamine hydrochloride 1-4 parts, oleylamine treated graphene 1-3 parts, polyhydric alcohol high-viscosity composite ester 5-15 parts, metal soap 10-20 parts, tungsten disulfide 1-2 parts, combustion-resistant agent 1-2 parts, antioxidant 1-2 parts and antifoaming agent 0.1-0.5 parts.The high-temperature wheel belt lubricating oil can maintain stable lubricating performance under extreme working conditions such as high temperature and high load, the raw materials are reasonably matched, the preparation method is simple, the lubricating oil is convenient to use, the application range is wide, and the lubricating oil is suitable for large-scale popularization and application.

Description

Technical Field

[0001] This invention relates to the field of lubricating oil technology, and in particular to a high-temperature tire lubricating oil and its preparation method. Background Technology

[0002] Rotary kilns are core equipment in the cement production industry and are also used in metallurgical applications such as magnetized roasting of lean iron ore. As high-temperature, heavy-duty equipment, its tire components need to operate continuously at 250-370℃, involving processes such as gas flow, fuel combustion, heat transfer, and material movement. The rotary kiln ensures complete fuel combustion, effectively transferring the heat from combustion to the material. Upon receiving this heat, the material undergoes a series of physicochemical changes, ultimately forming the finished clinker. The tire, as a key supporting component of the rotary kiln, plays a crucial role in stabilizing the kiln body and transmitting torque within this complex operating system.

[0003] However, due to the difference in thermal expansion coefficients and rigidity between the kiln body and the tire, there is a design gap between them, which leads to rolling displacement during operation. If lubrication is not done properly, it can easily cause seizing or slippage, resulting in abnormal friction between the pad and the tire, kiln vibration, and even damage to refractory bricks and kiln shutdown accidents. Therefore, tire lubrication is crucial.

[0004] Traditional gear oils or hydraulic oils, due to their low flash point and susceptibility to oxidation and coking at high temperatures, cannot meet the requirements of tire and belt operating conditions above 250°C. This not only exacerbates component wear but also causes severe smoke emission, polluting the environment and failing to meet lubrication needs. Existing tire-specific lubricants combine synthetic base oils with solid additives, which, while improving high-temperature volatilization and environmental friendliness, suffer from poor heat resistance at high temperatures, making them unsuitable for even higher-temperature conditions and leading to accelerated performance degradation. Furthermore, solid additives are prone to sedimentation and agglomeration during long-term storage, forming clumps that not only weaken lubrication but also increase the risk of component wear.

[0005] The aforementioned problems currently limit the long-term reliability and environmental performance of tire lubricants. Especially under harsh operating conditions of high temperature and heavy load, sedimentation and agglomeration and poor heat resistance have become key factors restricting their application. Developing a tire lubricant with high temperature resistance and strong anti-settling properties is of great significance for improving the operating efficiency of rotary kilns, reducing equipment wear and environmental pollution. Summary of the Invention

[0006] The purpose of this invention is to address the shortcomings of existing technologies by proposing a high-temperature tire lubricating oil and its preparation method.

[0007] A high-temperature tire lubricant, the raw materials of which, by weight, include: 60-100 parts of polyα-olefin, 5-15 parts of nano-molybdenum disulfide, 1-4 parts of dopamine hydrochloride, 1-3 parts of oleylamine-treated graphene, 5-15 parts of high-viscosity polyol composite ester, 10-20 parts of metal soap, 1-2 parts of tungsten disulfide, 1-2 parts of flame retardant, 1-2 parts of antioxidant, and 0.1-0.5 parts of antifoaming agent.

[0008] Preferably, the kinematic viscosity of the polyα-olefin at 100°C is 30-45 mm. 2 / s.

[0009] Preferably, the metal soap is at least one of calcium stearate, zinc stearate, and barium stearate.

[0010] Preferably, the particle size of tungsten disulfide is 1-10 μm.

[0011] Preferably, the antioxidant is at least one of dialkyldiphenylamine and hindered phenolic antioxidants.

[0012] Preferably, the antifoaming agent is a polyether-modified siloxane.

[0013] Preferably, the graphene treated with oleylamine is prepared by the following steps: dispersing graphene oxide in an aqueous ethanol solution by ultrasonication until uniform dispersion, adding oleylamine while stirring, stirring at 60-80℃ for 2-4 hours, cooling to room temperature, centrifuging, washing, and vacuum drying.

[0014] More preferably, the mass ratio of graphene oxide to oleylamine is 1-3:1-2.

[0015] The preparation method of the above-mentioned high-temperature tire lubricating oil includes the following steps: S1. Add nano-molybdenum disulfide to a Tris-HCl buffer solution with a pH of 8-9 and stir for 10-30 min. Add dopamine hydrochloride and treat with ultrasonication for 5-10 h while stirring. Centrifuge, wash, vacuum dry, and pulverize to obtain pretreated molybdenum disulfide. S2. Heat the poly-α-olefin to 70-80℃, add pretreated molybdenum disulfide and oleylamine-treated graphene while stirring, and continue stirring for 1-2 hours to obtain the preform. S3. Cool the preform to 50-60℃, add polyol high viscosity composite ester, metal soap, and tungsten disulfide and stir for 1-4 hours. Cool to 30-40℃, add flame retardant, antioxidant, and antifoaming agent and stir evenly to remove gas.

[0016] Preferably, in S1, the ultrasonic frequency is 70-90kHz. Beneficial effects

[0017] This invention utilizes the polymerization of dopamine hydrochloride on the surface of molybdenum disulfide to form a polydopamine-modified layer, which can not only effectively inhibit the aggregation of nanoparticles, but also enhance the compatibility with base oil by treating the long-chain alkyl structure of graphene with oleylamine. The synergistic effect of the two makes the solid additive uniformly dispersed in the system, and there is no sedimentation or agglomeration phenomenon after long-term storage.

[0018] In a high-temperature environment, dopamine forms a stable coating layer on the surface of molybdenum disulfide through intermolecular forces, inhibiting high-temperature agglomeration and preventing the oxidation failure of molybdenum disulfide. At the same time, the pretreated molybdenum disulfide and oleylamine-treated graphene fill the microcracks on the metal surface during friction, forming a stable lubricating film. The integrity of the lubricating film can still be maintained under high temperature and high load conditions, significantly reducing the coefficient of friction.

[0019] This invention maintains stable lubrication performance even under extreme working conditions such as high temperature and high load. Moreover, the raw materials are reasonably matched, the preparation method is simple, easy to use, and has a wide range of applications, making it suitable for large-scale promotion and application. Attached Figure Description

[0020] Figure 1 The graph shows a comparison of the kinematic viscosity and sintering load at 100°C of the high-temperature tire lubricating oils obtained in Example 5 and Comparative Examples 1-2.

[0021] Figure 2 The graph shows a comparison of the maximum non-seizure load and the maximum non-seizure load at 70°C for the high-temperature tire lubricating oils obtained in Example 5 and Comparative Examples 1-2. Detailed Implementation

[0022] The present invention will be further explained below with reference to specific embodiments.

[0023] The polyalphaolefin used below was purchased from Shenzhen Derun Petroleum Technology Co., Ltd., and its kinematic viscosity at 100°C was 39 mm. 2 / s. The polyether-modified siloxane used below was purchased from Hubei Sheng Sihai New Materials Co., Ltd., model SH-G1045, with a viscosity (25℃) of 15000-35000cp. The high-viscosity polyol composite ester used below was purchased from a certain petroleum (Yingkou) Co., Ltd., model GD2000A.

[0024] Example 1 A high-temperature tire lubricant, the raw materials of which include: 600g of polyα-olefin, 50g of nano molybdenum disulfide, 10g of dopamine hydrochloride, 10g of oleylamine-treated graphene, 50g of polyol high viscosity composite ester, 50g of calcium stearate, 50g of zinc stearate, 10g of tungsten disulfide powder, 10g of tricresyl phosphate, 10g of 2,6-di-tert-butyl-p-cresol, and 1g of polyether-modified siloxane.

[0025] The graphene treated with oleylamine was prepared by the following steps: 10g of graphene oxide was dispersed in 300g of 50% ethanol aqueous solution and ultrasonically dispersed evenly. 10g of oleylamine was added to the solution while stirring. The solution was stirred at 60℃ for 2h at a stirring speed of 400r / min. After cooling to room temperature, the solution was centrifuged, washed with anhydrous ethanol, and vacuum dried.

[0026] The preparation method of the above-mentioned high-temperature tire lubricating oil includes the following steps: S1. Add nano molybdenum disulfide to 500g of Tris-HCl buffer solution with pH 8, stir at 500r / min for 10min, add dopamine hydrochloride, and perform ultrasonic treatment for 5h with stirring at a frequency of 70kHz. Centrifuge, wash, vacuum dry, and pulverize to obtain pretreated molybdenum disulfide. S2. Add polyα-olefin to the reactor and heat to 70°C. Add pretreated molybdenum disulfide and oleylamine-treated graphene while stirring. Continue stirring for 1 hour at a stirring speed of 100 r / min to obtain the preform. S3. Cool the pre-made material to 50°C, add polyol high viscosity composite ester, calcium stearate, zinc stearate, and tungsten disulfide powder and stir for 1 hour. Cool the material to 30°C, add tricresyl phosphate, 2,6-di-tert-butyl-p-cresol, and polyether-modified siloxane and stir evenly. Start the vacuum pump to extract the gas from the material in the reactor.

[0027] Example 2 A high-temperature tire lubricant, the raw materials of which include: 1000g of polyα-olefin, 150g of nano molybdenum disulfide, 40g of dopamine hydrochloride, 30g of oleylamine-treated graphene, 150g of polyol high viscosity composite ester, 200g of barium stearate, 20g of tungsten disulfide powder, 20g of tricresyl phosphate, 20g of 2,6-di-tert-butyl-p-cresol, and 5g of polyether-modified siloxane.

[0028] The graphene treated with oleylamine was prepared by the following steps: 30g of graphene oxide was dispersed in 500g of 60% ethanol aqueous solution and ultrasonically dispersed evenly. 20g of oleylamine was added to the solution while stirring. The solution was stirred at 80℃ for 4h at a stirring speed of 600r / min. After cooling to room temperature, the solution was centrifuged, washed with anhydrous ethanol, and vacuum dried.

[0029] The preparation method of the above-mentioned high-temperature tire lubricating oil includes the following steps: S1. Add nano-molybdenum disulfide to 1000g of Tris-HCl buffer solution with pH 8.5, stir at 1200r / min for 30min, add dopamine hydrochloride, and perform ultrasonic treatment for 10h with stirring at a frequency of 90kHz. Centrifuge, wash, vacuum dry, and pulverize to obtain pretreated molybdenum disulfide. S2. Add polyα-olefin to the reactor and heat to 80°C. Add pretreated molybdenum disulfide and oleylamine-treated graphene while stirring. Continue stirring for 2 hours at a stirring speed of 200 r / min to obtain the preform. S3. Cool the pre-made material to 60°C, add high-viscosity polyol composite ester, barium stearate, and tungsten disulfide powder and stir for 4 hours. Cool the material to 40°C, add tricresyl phosphate, 2,6-di-tert-butyl-p-cresol, and polyether-modified siloxane and stir until homogeneous. Start the vacuum pump to extract the gas from the material in the reactor.

[0030] Example 3 A high-temperature tire lubricant, the raw materials of which include: 700g of polyα-olefin, 120g of nano molybdenum disulfide, 20g of dopamine hydrochloride, 25g of oleylamine-treated graphene, 80g of polyol high-viscosity composite ester, 100g of calcium stearate, 70g of barium stearate, 13g of tungsten disulfide powder, 17g of tricresyl phosphate, 12g of 2,6-di-tert-butyl-p-cresol, and 4g of polyether-modified siloxane.

[0031] The graphene treated with oleylamine was prepared by the following steps: 15g of graphene oxide was dispersed in 450g of 52% ethanol aqueous solution and ultrasonically dispersed evenly. 18g of oleylamine was added to the solution while stirring. The solution was stirred at 65℃ for 3.5h at a stirring speed of 450r / min. After cooling to room temperature, the solution was centrifuged, washed with anhydrous ethanol, and vacuum dried.

[0032] The preparation method of the above-mentioned high-temperature tire lubricating oil includes the following steps: S1. Add nano-molybdenum disulfide to 900g of Tris-HCl buffer solution with pH 9, stir at 1000r / min for 15min, add dopamine hydrochloride, and perform ultrasonic treatment for 7h with stirring at a frequency of 75kHz. Centrifuge, wash, vacuum dry, and pulverize to obtain pretreated molybdenum disulfide. S2. Add polyα-olefin to the reactor and heat to 77°C. Add pretreated molybdenum disulfide and oleylamine-treated graphene while stirring. Continue stirring for 80 minutes at a stirring speed of 180 r / min to obtain the preform. S3. Cool the pre-made material to 52°C, add polyol high viscosity composite ester, calcium stearate, barium stearate, and tungsten disulfide powder and stir for 3 hours. Cool the material to 33°C, add tricresyl phosphate, 2,6-di-tert-butyl-p-cresol, and polyether-modified siloxane and stir evenly. Start the vacuum pump to extract the gas from the material in the reactor.

[0033] Example 4 A high-temperature tire lubricant, the raw materials of which include: 900g of polyα-olefin, 80g of nano molybdenum disulfide, 30g of dopamine hydrochloride, 15g of oleylamine-treated graphene, 120g of high-viscosity polyol composite ester, 100g of zinc stearate, 30g of barium stearate, 17g of tungsten disulfide powder, 13g of tricresyl phosphate, 18g of 2,6-di-tert-butyl-p-cresol, and 2g of polyether-modified siloxane.

[0034] The graphene treated with oleylamine was prepared by the following steps: 25g of graphene oxide was dispersed in 350g of 58% ethanol aqueous solution and ultrasonically dispersed evenly. 12g of oleylamine was added to the solution while stirring. The solution was stirred at 75℃ for 2.5h at a stirring speed of 550r / min. After cooling to room temperature, the solution was centrifuged, washed with anhydrous ethanol, and vacuum dried.

[0035] The preparation method of the above-mentioned high-temperature tire lubricating oil includes the following steps: S1. Add nano-molybdenum disulfide to 700g of Tris-HCl buffer solution with pH 9, stir at 800r / min for 25min, add dopamine hydrochloride, and perform ultrasonic treatment for 8h with stirring at a frequency of 85kHz. Centrifuge, wash, vacuum dry, and pulverize to obtain pretreated molybdenum disulfide. S2. Add polyα-olefin to the reactor and heat to 73°C. Add pretreated molybdenum disulfide and oleylamine-treated graphene while stirring. Continue stirring for 100 minutes at a stirring speed of 120 r / min to obtain the preform. S3. Cool the pre-made material to 58°C, add polyol high viscosity composite ester, zinc stearate, barium stearate, and tungsten disulfide powder and stir for 2 hours. Cool the material to 37°C, add tricresyl phosphate, 2,6-di-tert-butyl-p-cresol, and polyether-modified siloxane and stir evenly. Start the vacuum pump to extract the gas from the material in the reactor.

[0036] Example 5 A high-temperature tire lubricant, the raw materials of which include: 800g of polyα-olefin, 100g of nano-molybdenum disulfide, 25g of dopamine hydrochloride, 20g of oleylamine-treated graphene, 100g of high-viscosity polyol composite ester, 60g of calcium stearate, 60g of zinc stearate, 30g of barium stearate, 15g of tungsten disulfide powder, 15g of tricresyl phosphate, 15g of 2,6-di-tert-butyl-p-cresol, and 3g of polyether-modified siloxane.

[0037] The graphene treated with oleylamine was prepared by the following steps: 20g of graphene oxide was dispersed in 400g of 55% ethanol aqueous solution and ultrasonically dispersed evenly. 15g of oleylamine was added to the solution while stirring. The solution was stirred at 70℃ for 3h at a stirring speed of 500r / min. After cooling to room temperature, the solution was centrifuged, washed with anhydrous ethanol, and vacuum dried.

[0038] The preparation method of the above-mentioned high-temperature tire lubricating oil includes the following steps: S1. Add nano-molybdenum disulfide to 800g of Tris-HCl buffer solution with pH 9, stir at 900r / min for 20min, add dopamine hydrochloride, and perform ultrasonic treatment for 7h with stirring at a frequency of 80kHz. Centrifuge, wash, vacuum dry, and pulverize to obtain pretreated molybdenum disulfide. S2. Add polyα-olefin to the reactor and heat to 75°C. Add pretreated molybdenum disulfide and oleylamine-treated graphene while stirring. Continue stirring for 90 minutes at a stirring speed of 150 r / min to obtain the preform. S3. Cool the pre-formed material to 55°C, add polyol high viscosity composite ester, calcium stearate, zinc stearate, barium stearate, and tungsten disulfide powder and stir for 2.5 hours. Cool the material to 35°C, add tricresyl phosphate, 2,6-di-tert-butyl-p-cresol, and polyether-modified siloxane and stir until homogeneous. Start the vacuum pump to extract the gas from the material in the reactor.

[0039] Comparative Example 1: A high-temperature tire lubricant, the raw materials of which include: 800g of polyα-olefin, 125g of nano-molybdenum disulfide, 20g of oleylamine-treated graphene, 100g of high-viscosity polyol composite ester, 60g of calcium stearate, 60g of zinc stearate, 30g of barium stearate, 15g of tungsten disulfide powder, 15g of tricresyl phosphate, 15g of 2,6-di-tert-butyl-p-cresol, and 3g of polyether-modified siloxane.

[0040] The graphene treated with oleylamine was prepared by the following steps: 20g of graphene oxide was dispersed in 400g of 55% ethanol aqueous solution and ultrasonically dispersed evenly. 15g of oleylamine was added to the solution while stirring. The solution was stirred at 70℃ for 3h at a stirring speed of 500r / min. After cooling to room temperature, the solution was centrifuged, washed with anhydrous ethanol, and vacuum dried.

[0041] The preparation method of the above-mentioned high-temperature tire lubricating oil includes the following steps: S1. Add polyα-olefin to the reactor and heat to 75°C. Add nano-molybdenum disulfide and oleylamine-treated graphene while stirring. Continue stirring for 90 minutes at a stirring speed of 150 r / min to obtain the preform. S2. Cool the pre-made material to 55°C, add polyol high viscosity composite ester, calcium stearate, zinc stearate, barium stearate, and tungsten disulfide powder and stir for 2.5 hours. Cool the material to 35°C, add tricresyl phosphate, 2,6-di-tert-butyl-p-cresol, and polyether-modified siloxane and stir until homogeneous. Start the vacuum pump to extract the gas from the material in the reactor.

[0042] Comparative Example 2: A high-temperature tire lubricant, the raw materials of which include: 800g of polyalphaolefin, 100g of nano-molybdenum disulfide, 25g of dopamine hydrochloride, 20g of graphene oxide, 100g of high-viscosity polyol composite ester, 60g of calcium stearate, 60g of zinc stearate, 30g of barium stearate, 15g of tungsten disulfide powder, 15g of tricresyl phosphate, 15g of 2,6-di-tert-butyl-p-cresol, and 3g of polyether-modified siloxane.

[0043] The preparation method of the above-mentioned high-temperature tire lubricating oil includes the following steps: S1. Add nano molybdenum disulfide to 800g of Tris-HCl buffer solution with pH 9, stir at 900r / min for 20min, add dopamine hydrochloride, and perform ultrasonic treatment for 7h with stirring at a frequency of 80kHz. Centrifuge, wash, vacuum dry, and pulverize to obtain pretreated molybdenum disulfide. S2. Add polyα-olefin to the reactor and heat to 75°C. Add pretreated molybdenum disulfide and graphene oxide while stirring. Continue stirring for 90 minutes at a stirring speed of 150 r / min to obtain the preform. S3. Cool the pre-formed material to 55°C, add polyol high viscosity composite ester, calcium stearate, zinc stearate, barium stearate, and tungsten disulfide powder and stir for 2.5 hours. Cool the material to 35°C, add tricresyl phosphate, 2,6-di-tert-butyl-p-cresol, and polyether-modified siloxane and stir until homogeneous. Start the vacuum pump to extract the gas from the material in the reactor.

[0044] Take 100.0g of the high-temperature tire lubricating oil obtained in Example 5 and Comparative Examples 1-2 and place it in a glass beaker. Place it in an oven at 50℃ for 15 days or at room temperature for 12 months. Then observe whether the test oil separates into layers and whether there is sediment at the bottom of the beaker.

[0045] The high-temperature tire lubricating oil obtained in Example 5 did not show any stratification or precipitation in environments of 50°C or room temperature; the high-temperature tire lubricating oil obtained in Comparative Example 1 showed stratification and precipitation in both environments of 50°C and room temperature; while the high-temperature tire lubricating oil obtained in Comparative Example 2 did not show any stratification or precipitation in environments of room temperature, but showed stratification and precipitation in environments of 50°C.

[0046] The kinematic viscosity at 100°C of the high-temperature tire lubricating oils obtained in Example 5 and Comparative Examples 1-2 was determined in accordance with GB / T 265-1988 "Determination of kinematic viscosity and calculation of dynamic viscosity of petroleum products".

[0047] The sintering load, maximum non-seize load, and maximum non-seize load at 70°C of the high-temperature tire lubricating oils obtained in Example 5 and Comparative Examples 1-2 were determined according to GB / T 3142-2019 "Determination of Lubricant Load Capacity - Four-Ball Method".

[0048] like Figure 1 and Figure 2 As shown, the high-temperature tire lubricating oil obtained in Example 5 has the highest kinematic viscosity at 100°C, and also the highest sintering load, maximum non-seize load, and maximum non-seize load at 70°C, which is significantly better than the comparative example.

[0049] The reason for the above results is that this invention utilizes dopamine to polymerize on the surface of molybdenum disulfide to form a polydopamine-modified layer. The catechol and amino functional groups in this layer interact strongly with the poly-α-olefin molecular chains, effectively inhibiting nanoparticle aggregation. Meanwhile, the long-chain alkyl structure of the oleylamine-treated graphene further enhances its compatibility with base oils. The synergistic effect of both ensures uniform dispersion of the solid additive in the system, preventing sedimentation and agglomeration even after long-term storage. Under high-temperature conditions, dopamine forms a stable coating layer on the surface of molybdenum disulfide through intermolecular forces, inhibiting high-temperature aggregation and preventing oxidation failure of molybdenum disulfide. Simultaneously, the pretreated molybdenum disulfide and oleylamine-treated graphene fill microcracks on the metal surface during friction, forming a stable lubricating film. This lubricating film maintains its integrity even under high-temperature and high-load conditions, significantly reducing the coefficient of friction.

[0050] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A high-temperature tire lubricant, characterized in that, The raw materials, by weight, include: 60-100 parts of polyα-olefin, 5-15 parts of nano molybdenum disulfide, 1-4 parts of dopamine hydrochloride, 1-3 parts of oleylamine-treated graphene, 5-15 parts of high-viscosity polyol composite ester, 10-20 parts of metal soap, 1-2 parts of tungsten disulfide, 1-2 parts of flame retardant, 1-2 parts of antioxidant, and 0.1-0.5 parts of antifoaming agent.

2. The high-temperature tire lubricating oil according to claim 1, characterized in that, The kinematic viscosity of polyalphaolefin at 100℃ is 30-45 mm. 2 / s.

3. The high-temperature tire lubricating oil according to claim 1, characterized in that, Metallic soaps are at least one of calcium stearate, zinc stearate, and barium stearate.

4. The high-temperature tire lubricating oil according to claim 1, characterized in that, Tungsten disulfide has a particle size of 1-10 μm.

5. The high-temperature tire lubricating oil according to claim 1, characterized in that, The antioxidant is at least one of dialkyldiphenylamine and hindered phenolic antioxidants.

6. The high-temperature tire lubricating oil according to claim 1, characterized in that, The antifoaming agent is a polyether-modified siloxane.

7. The high-temperature tire lubricating oil according to claim 1, characterized in that, The oleylamine-treated graphene is prepared by the following steps: graphene oxide is dispersed in an ethanol aqueous solution by ultrasonic dispersion, oleylamine is added to it under stirring, and the mixture is stirred at 60-80℃ for 2-4 hours. After cooling to room temperature, it is centrifuged, washed, and vacuum dried.

8. The high-temperature tire lubricating oil according to claim 7, characterized in that, The mass ratio of graphene oxide to oleylamine is 1-3:1-2.

9. A method for preparing a high-temperature tire lubricating oil as described in any one of claims 1-8, characterized in that, Includes the following steps: S1. Add nano-molybdenum disulfide to a Tris-HCl buffer solution with a pH of 8-9 and stir for 10-30 min. Add dopamine hydrochloride and treat with ultrasonication for 5-10 h while stirring. Centrifuge, wash, vacuum dry, and pulverize to obtain pretreated molybdenum disulfide. S2. Heat the poly-α-olefin to 70-80℃, add pretreated molybdenum disulfide and oleylamine-treated graphene while stirring, and continue stirring for 1-2 hours to obtain the preform. S3. Cool the preform to 50-60℃, add polyol high viscosity composite ester, metal soap, and tungsten disulfide and stir for 1-4 hours. Cool to 30-40℃, add flame retardant, antioxidant, and antifoaming agent and stir evenly to remove gas.

10. The method for preparing the high-temperature tire lubricating oil according to claim 9, characterized in that, In S1, the ultrasonic frequency is 70-90kHz.

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