High-temperature corrosion resistant lubricating oil and preparation method thereof

Abstract

The present application relates to the technical field of lubricating oil, and particularly relates to a high-temperature corrosion resistant lubricating oil and a preparation method thereof.The raw materials of the high-temperature corrosion resistant lubricating oil include, by mass fraction, base oil 130-190 parts, extreme pressure anti-wear agent 1-5 parts, amino-modified graphene 1-5 parts, antirust agent 0.1-1 part, antioxidant 1-3 parts, defoaming agent 0.1-1 part, trioctyl trimellitate 5-15 parts, sodium lignosulfonate 1-5 parts, and sodium bentonite 1-5 parts.The high-temperature corrosion resistant lubricating oil can not only meet the use requirements of bearings under the working conditions of high speed, high temperature and heavy load, effectively improve the anti-wear and friction-reducing properties of the lubricating oil under high temperature, but also has a simple preparation method and 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 corrosion resistant lubricating oil and its preparation method. Background Technology

[0002] As an indispensable functional fluid in modern industrial systems, lubricating oil is widely used in automotive engines, industrial machinery and equipment, and precision instruments. It forms a protective medium on the surface of friction pairs in liquid or semi-solid form, playing a key role in reducing mechanical wear, conducting heat, keeping components clean, enhancing sealing performance, and buffering impact loads.

[0003] The quality of lubricating oil directly affects the operating efficiency, energy consumption, and service life of mechanical equipment. With the acceleration of industrialization and the development of machinery and equipment towards higher power density, lubrication systems face the challenges of harsh operating conditions such as high temperature, heavy load, and long cycle operation, which places higher demands on the comprehensive performance of lubricating oils.

[0004] Currently, lubricating oils mainly consist of two parts: base oil and functional additives. Base oil, as the system carrier, determines the basic properties of the lubricating oil, such as viscosity-temperature characteristics and oxidation stability, through its molecular structure and physicochemical properties. Functional additives include extreme pressure anti-wear agents, antioxidants, dispersants, and other functional components, which can specifically compensate for the performance shortcomings of the base oil under specific operating conditions.

[0005] When machinery is subjected to high temperature and high pressure environments, the viscosity of the base oil decreases significantly with increasing temperature, leading to a thinning or even rupture of the oil film, resulting in direct contact between metal surfaces and causing severe friction. To address this boundary lubrication condition, the industry has long relied on sulfur, phosphorus, and chlorine-based extreme pressure anti-wear agents. These compounds undergo thermal decomposition reactions at the friction interface, forming protective layers of metal salts such as iron sulfide and iron phosphate with the metal matrix. Although these reaction films have high hardness, their brittle nature causes them to continuously peel off during actual friction, leading to multiple negative effects: the acidic substances generated by the reaction corrode the metal surface, shortening the service life of critical components; wear debris contamination exacerbates oil deterioration, creating a vicious cycle of performance degradation; and frequent lubricant changes increase maintenance costs and generate significant hazardous waste disposal issues.

[0006] Traditional lubrication systems have shown significant limitations in adaptability. Providing a lubricant that can maintain anti-wear performance under extreme pressure, possess corrosion resistance under high-temperature conditions, and also has self-adaptive repair properties is of strategic significance for promoting the development of high-end equipment manufacturing. Summary of the Invention

[0007] The purpose of this invention is to address the shortcomings of existing technologies by proposing a high-temperature corrosion resistant lubricating oil and its preparation method.

[0008] A high-temperature corrosion resistant lubricating oil, the raw materials of which include, by weight: 130-190 parts base oil, 1-5 parts extreme pressure anti-wear agent, 1-5 parts amino-modified graphene, 0.1-1 parts rust inhibitor, 1-3 parts antioxidant, 0.1-1 parts defoamer, 5-15 parts trioctyl trimellitate, 1-5 parts sodium lignosulfonate, and 1-5 parts sodium bentonite.

[0009] Preferably, the base oil includes: polyalphaolefin and hydrogenated palm oil; the mass ratio of polyalphaolefin to hydrogenated palm oil is 100-150:30-40.

[0010] Preferably, the extreme pressure anti-wear agent comprises: isobutylene sulfide, triisooctyl borate, nano-tungsten disulfide, and chelated zinc; the mass ratio of isobutylene sulfide, triisooctyl borate, nano-tungsten disulfide, and chelated zinc is 1-3:1:0.1-1:0.1-1.

[0011] Preferably, the chelated zinc is zinc dialkyl dithiophosphate.

[0012] Preferably, the rust inhibitor is barium petroleum sulfonate and / or calcium dinonylnaphthalene sulfonate.

[0013] Preferably, the antioxidant includes: diphenylamine, alkyl diphenylamine, and 2,6-di-tert-butyl-p-cresol; the mass ratio of diphenylamine, alkyl diphenylamine, and 2,6-di-tert-butyl-p-cresol is 0.5-1:0.5-1:1-2.

[0014] Preferably, the defoamer is a polyether-modified siloxane.

[0015] Preferably, amino-modified graphene is prepared by the following steps: adding graphene oxide to an aqueous ethanol solution and sonicating for 10-30 min, adjusting the pH of the system to 5-6, adding tetrabutyl titanate, continuing sonication at 60-70℃ for 1-4 h, adding a silane coupling agent, stirring at 70-80℃ for 1-2 h, filtering, washing, and vacuum drying.

[0016] More preferably, the mass ratio of graphene oxide, tetrabutyl titanate, and silane coupling agent is 1-5:1-3:0.1-1.

[0017] The preparation method of the above-mentioned high-temperature corrosion resistant lubricating oil includes the following steps:

[0018] S1. Preheat hydrogenated palm oil to a molten state; mix polyalphaolefin, molten hydrogenated palm oil, and amino-modified graphene under nitrogen protection, and ultrasonically treat at 80-90℃ for 1-2 hours to obtain a premix.

[0019] S2. Add extreme pressure anti-wear agent to premix, stir at 80-88℃ for 1-2 hours, add the remaining raw materials and stir evenly, then grind.

[0020] Beneficial effects:

[0021] This invention uses a blend of polyalphaolefin and hydrogenated palm oil as the base oil, which is not only widely available but also significantly improves the biodegradability of the lubricating oil. At the same time, when blended with amino-modified graphene, it can form an adsorption film on the metal surface, thereby isolating the metal from corrosive substances and achieving the effect of inhibiting corrosion. Combined with the effect of trioctyl trimellitate, the lubricating oil exhibits excellent viscosity and high performance retention in high-temperature environments.

[0022] This invention involves exfoliating graphene oxide and depositing a nano-titanium dioxide layer on its sheet structure to enhance thermal conductivity. The surface is treated with KH550 coupling agent, and the organic segments of amino functional groups on the surface improve the compatibility of graphene in base oil, enabling the amino-modified graphene to form a stable dispersion system in the oil phase. At the same time, it facilitates the formation of oriented interlayer slip structures during lubrication. Combined with the ball bearing-like effect of nanoparticles and the synergistic effect of sodium-based bentonite, a layered composite structure is formed through ion exchange. The combined effect results in excellent anti-wear and self-repair performance under high-temperature conditions.

[0023] In high-temperature environments, extreme pressure anti-wear agents decompose isobutylene sulfide to generate iron sulfide, which, together with triisooctyl borate, forms a boron-containing protective film. This film, combined with amino-modified graphene, adsorbs onto metal active sites, synergistically enhancing extreme pressure performance.

[0024] This invention not only meets the requirements of bearings in high-speed, high-temperature, and high-load conditions in terms of high-temperature resistance and viscosity-temperature properties, effectively improving the anti-wear and friction-reducing properties of lubricating oil at high temperatures, but also has a simple preparation method, making it suitable for large-scale application. Attached Figure Description

[0025] Figure 1 The image shows a comparison of the load-bearing capacity of the four balls before and after heat treatment for the lubricating oils obtained in Example 5 and Comparative Examples 1-2.

[0026] Figure 2 This is a comparison chart of the coking quality and viscosity index of the lubricating oils obtained in Example 5 and Comparative Examples 1-2. Detailed Implementation

[0027] The present invention will be further explained below with reference to specific embodiments.

[0028] The polyalphaolefins used below were purchased from Hubei Moufeng Chemical Co., Ltd., CAS No. 68037-01-4.

[0029] Example 1

[0030] A high-temperature corrosion resistant lubricating oil, the raw materials of which include: 100g of polyalphaolefin, 30g of hydrogenated palm oil, 1g of extreme pressure anti-wear agent, 1g of amino-modified graphene, 0.1g of barium petroleum sulfonate, 1g of antioxidant, 0.1g of BYK024 defoamer, 5g of trioctyl trimellitate, 1g of sodium lignosulfonate, and 1g of sodium bentonite.

[0031] The extreme pressure anti-wear agent is composed of isobutylene sulfide, triisooctyl borate, nano-tungsten disulfide, and zinc dialkyl dithiophosphate in a mass ratio of 1:1:0.1:0.1. The antioxidant is composed of diphenylamine, alkyl diphenylamine, and 2,6-di-tert-butyl-p-cresol in a mass ratio of 0.5:0.5:1.

[0032] Amino-modified graphene was prepared by the following steps: 1g of graphene oxide was added to 30g of 40% ethanol aqueous solution and ultrasonically treated for 10min at a frequency of 30kHz. The pH of the system was adjusted to 5-6 using 1mol / L acetic acid solution. 1g of tetrabutyl titanate was added and ultrasonic treatment was continued at 60℃ for 1h. 0.1g of KH550 coupling agent was added and stirred at 70℃ for 1h at a stirring speed of 100r / min. The mixture was then filtered, washed, and vacuum dried.

[0033] The preparation method of the above-mentioned high-temperature corrosion resistant lubricating oil includes the following steps:

[0034] S1. Preheat hydrogenated palm oil to a molten state; under nitrogen protection, add polyalphaolefin, molten hydrogenated palm oil, and amino-modified graphene into a reactor, and sonicate at 80°C for 1 hour at a frequency of 30kHz to obtain a premix.

[0035] S2. Add extreme pressure anti-wear agent to premix, stir at 80℃ for 1 hour at a stirring speed of 500 r / min, add the remaining raw materials and stir evenly, with a stirring vacuum degree of -0.08 MPa, and then grind.

[0036] Example 2

[0037] A high-temperature corrosion resistant lubricating oil, the raw materials of which include: 150g of polyalphaolefin, 40g of hydrogenated palm oil, 5g of extreme pressure anti-wear agent, 5g of amino-modified graphene, 1g of calcium dinonylnaphthalene sulfonate, 3g of antioxidant, 1g of BYK024 defoamer, 15g of trioctyl trimellitate, 5g of sodium lignosulfonate, and 5g of sodium bentonite.

[0038] The extreme pressure anti-wear agent is composed of isobutylene sulfide, triisooctyl borate, nano-tungsten disulfide, and zinc dialkyl dithiophosphate in a mass ratio of 3:1:1:1. The antioxidant is composed of diphenylamine, alkyl diphenylamine, and 2,6-di-tert-butyl-p-cresol in a mass ratio of 1:1:2.

[0039] Amino-modified graphene was prepared by the following steps: 5g of graphene oxide was added to 50g of 60% ethanol aqueous solution and ultrasonically treated for 30min at a frequency of 50kHz. The pH of the system was adjusted to 5-6 using 2mol / L acetic acid solution. 3g of tetrabutyl titanate was added and ultrasonic treatment was continued at 70℃ for 4h. 1g of KH550 coupling agent was added and stirred at 80℃ for 2h at a stirring speed of 400r / min. The mixture was then filtered, washed, and vacuum dried.

[0040] The preparation method of the above-mentioned high-temperature corrosion resistant lubricating oil includes the following steps:

[0041] S1. Preheat hydrogenated palm oil to a molten state; under nitrogen protection, add polyalphaolefin, molten hydrogenated palm oil, and amino-modified graphene into a reactor, and sonicate at 90°C for 2 hours at a frequency of 50kHz to obtain a premix.

[0042] S2. Add extreme pressure anti-wear agent to premix, stir at 88℃ for 2 hours at a stirring speed of 1500 r / min, add the remaining raw materials and stir evenly, with a stirring vacuum degree of -0.1 MPa, and then grind.

[0043] Example 3

[0044] A high-temperature corrosion resistant lubricating oil, the raw materials of which include: 110g of polyalphaolefin, 37g of hydrogenated palm oil, 2g of extreme pressure anti-wear agent, 4g of amino-modified graphene, 0.3g of barium petroleum sulfonate, 2.5g of antioxidant, 0.2g of BYK024 defoamer, 12g of trioctyl trimellitate, 2g of sodium lignosulfonate, and 4g of sodium bentonite.

[0045] The extreme pressure anti-wear agent is composed of isobutylene sulfide, triisooctyl borate, nano-tungsten disulfide, and zinc dialkyl dithiophosphate in a mass ratio of 1.5:1:0.8:0.3. The antioxidant is composed of diphenylamine, alkyl diphenylamine, and 2,6-di-tert-butyl-p-cresol in a mass ratio of 0.9:0.6:1.7.

[0046] Amino-modified graphene was prepared by the following steps: 2g of graphene oxide was added to 45g of 45% ethanol aqueous solution and ultrasonically treated for 25min at a frequency of 35kHz. The pH of the system was adjusted to 5-6 using 1.8mol / L acetic acid solution. 1.5g of tetrabutyl titanate was added and ultrasonic treatment was continued at 68℃ for 2h. 0.8g of KH550 coupling agent was added and stirred at 73℃ for 100min at a stirring speed of 200r / min. The mixture was then filtered, washed, and vacuum dried.

[0047] The preparation method of the above-mentioned high-temperature corrosion resistant lubricating oil includes the following steps:

[0048] S1. Preheat hydrogenated palm oil to a molten state; under nitrogen protection, add polyalphaolefin, molten hydrogenated palm oil, and amino-modified graphene into a reactor, and sonicate at 88°C for 80 minutes at a frequency of 45kHz to obtain a premix.

[0049] S2. Add extreme pressure anti-wear agent to premix, stir at 82℃ for 100 min at a stirring speed of 800 r / min, add the remaining raw materials and stir evenly, with a stirring vacuum degree of -0.09 MPa, and then grind.

[0050] Example 4

[0051] A high-temperature corrosion resistant lubricating oil, the raw materials of which include: 130g of polyalphaolefin, 33g of hydrogenated palm oil, 4g of extreme pressure anti-wear agent, 2g of amino-modified graphene, 0.2g of barium petroleum sulfonate, 0.5g of calcium dinonylnaphthalene sulfonate, 1.5g of antioxidant, 0.8g of BYK024 defoamer, 8g of trioctyl trimellitate, 4g of sodium lignosulfonate, and 2g of sodium bentonite.

[0052] The extreme pressure anti-wear agent is composed of isobutylene sulfide, triisooctyl borate, nano-tungsten disulfide, and zinc dialkyl dithiophosphate in a mass ratio of 2.5:1:0.2:0.7. The antioxidant is composed of diphenylamine, alkyl diphenylamine, and 2,6-di-tert-butyl-p-cresol in a mass ratio of 0.7:0.8:1.3.

[0053] Amino-modified graphene was prepared by the following steps: 4g of graphene oxide was added to 35g of 55% ethanol aqueous solution and ultrasonically treated for 15min at a frequency of 45kHz. The pH of the system was adjusted to 5-6 using 1.2mol / L acetic acid solution. 2.5g of tetrabutyl titanate was added and ultrasonic treatment was continued at 62℃ for 3h. 0.2g of KH550 coupling agent was added and stirred at 77℃ for 80min at a stirring speed of 300r / min. The mixture was then filtered, washed, and vacuum dried.

[0054] The preparation method of the above-mentioned high-temperature corrosion resistant lubricating oil includes the following steps:

[0055] S1. Preheat hydrogenated palm oil to a molten state; under nitrogen protection, add polyalphaolefin, molten hydrogenated palm oil, and amino-modified graphene into a reaction vessel, and sonicate at 82°C for 100 min at an ultrasonic frequency of 35 kHz to obtain a premix.

[0056] S2. Add extreme pressure anti-wear agent to premix, stir at 86℃ for 80 minutes at a stirring speed of 1200 r / min, add the remaining raw materials and stir evenly, with a stirring vacuum degree of -0.09 MPa, and then grind.

[0057] Example 5

[0058] A high-temperature corrosion resistant lubricating oil, the raw materials of which include: 120g of polyalphaolefin, 35g of hydrogenated palm oil, 3g of extreme pressure anti-wear agent, 3g of amino-modified graphene, 0.25g of barium petroleum sulfonate, 0.25g of calcium dinonylnaphthalene sulfonate, 2g of antioxidant, 0.5g of BYK024 defoamer, 10g of trioctyl trimellitate, 3g of sodium lignosulfonate, and 3g of sodium bentonite.

[0059] The extreme pressure anti-wear agent is composed of isobutylene sulfide, triisooctyl borate, nano-tungsten disulfide, and zinc dialkyl dithiophosphate in a mass ratio of 2:1:0.5:0.5. The antioxidant is composed of diphenylamine, alkyl diphenylamine, and 2,6-di-tert-butyl-p-cresol in a mass ratio of 0.8:0.7:1.5.

[0060] Amino-modified graphene was prepared by the following steps: 3g of graphene oxide was added to 40g of 50% ethanol aqueous solution and ultrasonically treated for 20min at a frequency of 40kHz. The pH of the system was adjusted to 5-6 using 1.5mol / L acetic acid solution. 2g of tetrabutyl titanate was added, and ultrasonic treatment was continued at 65℃ for 2.5h. 0.5g of KH550 coupling agent was added, and the mixture was stirred at 75℃ for 90min at a stirring speed of 240r / min. The mixture was then filtered, washed, and vacuum dried.

[0061] The preparation method of the above-mentioned high-temperature corrosion resistant lubricating oil includes the following steps:

[0062] S1. Preheat hydrogenated palm oil to a molten state; under nitrogen protection, add polyalphaolefin, molten hydrogenated palm oil, and amino-modified graphene into a reaction vessel, and sonicate at 85°C for 90 minutes at an ultrasonic frequency of 40kHz to obtain a premix.

[0063] S2. Add extreme pressure anti-wear agent to premix, stir at 84℃ for 90 min at a stirring speed of 1000 r / min, add the remaining raw materials and stir evenly, with a stirring vacuum of -0.09 MPa, and then grind.

[0064] Comparative Example 1

[0065] A high-temperature corrosion resistant lubricating oil, the raw materials of which include: 120g of polyalphaolefin, 35g of hydrogenated palm oil, 3g of extreme pressure anti-wear agent, 3g of amino-modified graphene, 0.25g of barium petroleum sulfonate, 0.25g of calcium dinonylnaphthalene sulfonate, 2g of antioxidant, 0.5g of BYK024 defoamer, 10g of trioctyl trimellitate, 3g of sodium lignosulfonate, and 3g of sodium bentonite.

[0066] The extreme pressure anti-wear agent is composed of isobutylene sulfide, triisooctyl borate, nano-tungsten disulfide, and zinc dialkyl dithiophosphate in a mass ratio of 2:1:0.5:0.5. The antioxidant is composed of diphenylamine, alkyl diphenylamine, and 2,6-di-tert-butyl-p-cresol in a mass ratio of 0.8:0.7:1.5.

[0067] Amino-modified graphene was prepared by the following steps: 3g of graphene oxide was added to 40g of 50% ethanol aqueous solution and ultrasonically treated for 20min at a frequency of 40kHz. The pH of the system was adjusted to 5-6 using 1.5mol / L acetic acid solution. 0.5g of KH550 coupling agent was added and stirred at 75℃ for 90min at a stirring speed of 240r / min. The mixture was then filtered, washed, and vacuum dried.

[0068] The preparation method of the above-mentioned high-temperature corrosion resistant lubricating oil includes the following steps:

[0069] S1. Preheat hydrogenated palm oil to a molten state; under nitrogen protection, add polyalphaolefin, molten hydrogenated palm oil, and amino-modified graphene into a reaction vessel, and sonicate at 85°C for 90 minutes at an ultrasonic frequency of 40kHz to obtain a premix.

[0070] S2. Add extreme pressure anti-wear agent to premix, stir at 84℃ for 90 min at a stirring speed of 1000 r / min, add the remaining raw materials and stir evenly, with a stirring vacuum of -0.09 MPa, and then grind.

[0071] Comparative Example 2

[0072] A high-temperature corrosion resistant lubricating oil, the raw materials of which include: 120g of polyalphaolefin, 35g of hydrogenated palm oil, 3g of extreme pressure anti-wear agent, 3g of amino-modified graphene, 0.25g of barium petroleum sulfonate, 0.25g of calcium dinonylnaphthalene sulfonate, 2g of antioxidant, 0.5g of BYK024 defoamer, 10g of trioctyl trimellitate, and 3g of sodium lignosulfonate.

[0073] The extreme pressure anti-wear agent is composed of isobutylene sulfide, triisooctyl borate, nano-tungsten disulfide, and zinc dialkyl dithiophosphate in a mass ratio of 2:1:0.5:0.5. The antioxidant is composed of diphenylamine, alkyl diphenylamine, and 2,6-di-tert-butyl-p-cresol in a mass ratio of 0.8:0.7:1.5.

[0074] Amino-modified graphene was prepared by the following steps: 3g of graphene oxide was added to 40g of 50% ethanol aqueous solution and ultrasonically treated for 20min at a frequency of 40kHz. The pH of the system was adjusted to 5-6 using 1.5mol / L acetic acid solution. 2g of tetrabutyl titanate was added, and ultrasonic treatment was continued at 65℃ for 2.5h. 0.5g of KH550 coupling agent was added, and the mixture was stirred at 75℃ for 90min at a stirring speed of 240r / min. The mixture was then filtered, washed, and vacuum dried.

[0075] The preparation method of the above-mentioned high-temperature corrosion resistant lubricating oil includes the following steps:

[0076] S1. Preheat hydrogenated palm oil to a molten state; under nitrogen protection, add polyalphaolefin, molten hydrogenated palm oil, and amino-modified graphene into a reaction vessel, and sonicate at 85°C for 90 minutes at an ultrasonic frequency of 40kHz to obtain a premix.

[0077] S2. Add extreme pressure anti-wear agent to premix, stir at 84℃ for 90 min at a stirring speed of 1000 r / min, add the remaining raw materials and stir evenly, with a stirring vacuum of -0.09 MPa, and then grind.

[0078] The four-ball load capacity of the lubricating oils obtained in Example 5 and Comparative Examples 1-2 was determined according to GB / T 3142-2019 "Determination of Load Capacity of Lubricants - Four-Ball Method". The lubricating oils obtained in Example 5 and Comparative Examples 1-2 were treated at 150°C for 8 hours, and their four-ball load capacity was measured again.

[0079] like Figure 1 As shown, the four-ball load capacity of the lubricating oil obtained in Example 5 was the highest before and after heat treatment, which was better than that of Comparative Examples 1-2 (P<0.05).

[0080] The copper strip corrosion grades of the lubricating oils obtained in Example 5 and Comparative Examples 1-2 were determined according to GB / T 5096-2017 "Test Method for Copper Strip Corrosion of Petroleum Products". The lubricating oils obtained in Example 5 and Comparative Examples 1-2 were treated at 150℃ for 8 hours, and their copper strip corrosion grades were determined again. The results are shown in Table 1.

[0081] Table 1. Corrosion ratings of copper sheets before and after heat treatment for the lubricating oils obtained in Example 5 and Comparative Examples 1-2.

[0082]

[0083] As shown in Table 1, the copper strip corrosion level of the lubricating oil obtained in Example 5 was optimal both before and after heat treatment.

[0084] The coking quality of the lubricating oils obtained in Example 5 and Comparative Examples 1-2 was tested at 150℃ for 20 hours using a high-temperature coking performance tester. The viscosity index of the lubricating oils obtained in Example 5 and Comparative Examples 1-2 was determined according to ASTM D 2270.

[0085] like Figure 2 As shown, the lubricating oil obtained in Example 5 had the lowest coking quality and the highest viscosity index, which was better than Comparative Examples 1-2 (P<0.05).

[0086] The applicant believes that this invention uses a blend of polyalphaolefin and hydrogenated palm oil as the base oil, which is not only widely available but also significantly improves the biodegradability of the lubricating oil. Simultaneously, the blend with amino-modified graphene forms an adsorption film on the metal surface, isolating the metal from corrosive substances and inhibiting corrosion. Combined with the effect of trioctyl trimellitate, the lubricating oil exhibits excellent viscosity and high performance retention in high-temperature environments. Furthermore, after exfoliating graphene oxide, the invention deposits a nano-titanium dioxide layer on its sheet structure to enhance thermal conductivity. The surface is treated with KH550 coupling agent, which improves the compatibility of graphene with the amino functional groups in the base oil, allowing the amino-modified graphene to form a stable dispersion system in the oil phase. This facilitates the formation of oriented interlayer slip structures during lubrication. Combined with the ball bearing-like effect of nanoparticles and the synergistic effect of sodium-based bentonite through ion exchange, this results in a layered composite structure with excellent anti-wear and self-repairing performance in high-temperature environments. In high-temperature environments, extreme pressure anti-wear agents decompose isobutylene sulfide to generate iron sulfide, which, together with triisooctyl borate, forms a boron-containing protective film. This film, combined with amino-modified graphene, adsorbs onto metal active sites, synergistically enhancing extreme pressure performance.

[0087] 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 corrosion resistant lubricating oil, characterized by, The raw materials include, by mass fraction: base oil 130-190 parts, extreme pressure anti-wear agent 1-5 parts, amino-modified graphene 1-5 parts, anti-rust agent 0.1-1 part, antioxidant 1-3 parts, defoaming agent 0.1-1 part, tricresyl phosphate 5-15 parts, sodium lignosulfonate 1-5 parts, and sodium-based bentonite 1-5 parts; The base oil includes poly-alpha olefin and hydrogenated palm oil, and the mass ratio of poly-alpha olefin to hydrogenated palm oil is 100-150:30-40; The extreme pressure anti-wear agent includes sulfurized isobutylene, triisooctyl borate, nano tungsten disulfide, and chelated zinc, and the mass ratio of sulfurized isobutylene to triisooctyl borate to nano tungsten disulfide to chelated zinc is 1-3:1:0.1-1:0.1-1; The chelated zinc is zinc dialkyldithiophosphate; The amino-modified graphene is prepared by the following steps: adding graphene oxide into an ethanol aqueous solution and ultrasonically treating for 10-30 min, adjusting the pH value of the system to 5-6, adding tetrabutyl titanate thereto, and continuously ultrasonically treating at 60-70°C for 1-4 h, adding silane coupling agent, and stirring at 70-80°C for 1-2 h, filtering, washing, and vacuum drying.

2. The high temperature corrosion resistant lubricating oil of claim 1, wherein, The anti-rust agent is barium petroleum sulfonate and / or calcium dinonylnaphthalene sulfonate.

3. The high temperature corrosion resistant lubricating oil of claim 1, wherein the antioxidant is It includes: Diphenylamine, alkyl diphenylamine, and 2,6-di-tert-butyl-p-cresol, and the mass ratio of diphenylamine to alkyl diphenylamine to 2,6-di-tert-butyl-p-cresol is 0.5-1:0.5-1:1-2.

4. The high temperature corrosion resistant lubricating oil of claim 1, wherein, The defoaming agent is polyether-modified siloxane.

5. The high temperature corrosion resistant lubricating oil of claim 1, wherein, The mass ratio of graphene oxide to tetrabutyl titanate to silane coupling agent is 1-5:1-3:0.1-1.

6. A process for the preparation of a high temperature corrosion resistant lubricating oil as claimed in any one of claims 1 to 5, characterised in that, It includes the following steps: S1, preheat the hydrogenated palm oil to a molten state; mix poly-alpha olefin, hydrogenated palm oil in a molten state, and amino-modified graphene under nitrogen protection, ultrasonically treat at 80-90°C for 1-2 h, and obtain a premix; S2, add the extreme pressure anti-wear agent to the premix, stir at 80-88°C for 1-2 h, add the remaining raw materials, and stir uniformly, and grind.

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