Nanometer anti-wear lubricating oil for super-high speed racing engine and preparation method thereof

Abstract

The application relates to the field of lubricating oil, and more particularly to a kind of nano anti-wear lubricating oil for super high speed racing engine and a preparation method thereof.The nano anti-wear lubricating oil for super high speed racing engine comprises, by mass fraction, at least: base combined oil 50-80 parts, nano additive 2-4 parts, dispersant 1-2 parts, anti-wear agent 3-8 parts, antioxidant 1-3 parts, and viscosity index improver 3-6 parts.The nano anti-wear lubricating oil prepared by the application not only can maintain excellent wear resistance, but also has good thermal stability and long-term lubrication durability, and greatly reduces the probability of lubricating film rupture and long-time use failure under extreme working conditions, greatly meeting the quality and service life requirements of existing high-speed racing for lubricating oil.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of lubricating oil, and more particularly to a kind of nanometer anti-wear lubricating oil for super-high speed racing engine and its preparation method. BACKGROUND

[0002] In the field of racing sports, the limit breakthrough of engine performance directly determines the track competitiveness. Modern racing engines generally adopt the design concept of small displacement and high strengthening, and its speed often reaches the super-high level of 18000-22000 rpm, the average speed of piston exceeds 30 m / s, and it runs under the working condition of continuous high temperature and extreme shear force. Such harsh environment puts strict requirements on the lubricating system, and the lubricating oil needs to form a stable anti-wear protective film in a very short time, while maintaining low viscosity to reduce high-speed stirring loss.

[0003] At present, the traditional racing engine lubricating oil is mainly based on mineral oil or synthetic base oil, and adds various functional additives, such as antioxidants, detergents, dispersants and extreme pressure anti-wear agents. These lubricating oils can reduce friction and wear, reduce working temperature and prevent metal surface corrosion to a certain extent. However, under the condition of super-high speed, the carrying capacity of traditional lubricating oil film is limited, and it is easy to break due to high temperature and high pressure, which leads to direct contact of metal surface, aggravates wear and even causes component failure. In addition, the viscosity characteristics of traditional lubricating oil are difficult to maintain stable under extreme working conditions, resulting in a decrease in lubrication efficiency, affecting the power output and fuel economy of the engine; for example, patent CN109825354A provides a kind of racing special lubricating oil and its preparation method, the composition mainly includes synthetic base oil, viscosity index modifier, corrosion inhibitor, antioxidant, anti-wear agent and other raw materials, it claims that the racing special lubricating oil has good lubricating performance, thermal stability and antioxidant performance, the lubricating oil prepared by mixing it with other raw materials has excellent low-temperature fluidity, high-temperature viscosity, wear resistance and antioxidant performance, the oil film strength is high, the lubricity is good, and it is suitable for the requirements of racing for rapid start and rapid acceleration, but in actual application, it is insufficient to respond to the application environment under extreme conditions, and it cannot realize effective application under super-high speed.

[0004] In recent years, with the development of nanomaterial science, some studies have attempted to introduce nanoparticles as lubricating oil additives into the lubricating system. For example, carbon nanotubes, graphene, molybdenum disulfide nanosheets, zinc oxide and copper nanoparticles are widely studied for improving the performance of lubricating oil due to their excellent friction and wear reduction performance, good thermal conductivity and chemical stability. These nano additives can form a physical barrier or chemical reaction film on the surface of the friction pair, thereby significantly reducing the friction coefficient and reducing the amount of wear. However, there are still many challenges in the existing technology for the dispersion stability, concentration control, and compatibility with base oil and other additives of nanoparticles in lubricating oil, which limits their large-scale application in ultra-high speed racing engine.

[0005] In summary, the conventional lubricating oil used in the prior art has problems such as easy rupture of the lubricating film, insufficient wear resistance, poor thermal stability, and the like under the extreme working conditions of the ultra-high speed racing engine, and it is difficult to effectively meet the demand of the engine for high-efficiency and long-life lubrication. At the same time, although the nano additives bring new possibilities for the improvement of the performance of lubricating oil, they still face technical bottlenecks such as poor dispersibility, high cost, and unclear action mechanism in practical application. Therefore, it is urgent to develop a new type of nano lubricating oil with excellent wear resistance, thermal stability and long-term lubrication durability to meet the development needs of the ultra-high speed racing engine. SUMMARY

[0006] In summary, how to prepare a new type of nano lubricating oil with excellent wear resistance, thermal stability and long-term lubrication durability to meet the lubrication needs of the existing ultra-high speed racing engine has become an important research topic for those skilled in the art. Through in-depth research in the field of lubricating oil, the applicant finally proposes a nano anti-wear lubricating oil for ultra-high speed racing engine and a preparation method thereof. The nano anti-wear lubricating oil finally prepared not only can maintain excellent wear resistance, but also has good thermal stability and long-term lubrication durability, and greatly reduces the probability of easy rupture of the lubricating film and failure of long-term use under extreme working conditions, greatly meeting the quality and service life requirements of the existing high-speed racing for lubricating oil.

[0007] A nano anti-wear lubricating oil for ultra-high speed racing engine, by mass fraction, the raw materials at least include: base combined oil 50-80 parts, nano additive 2-4 parts, dispersant 1-2 parts, anti-wear agent 3-8 parts, antioxidant 1-3 parts, viscosity index improver 3-6 parts.

[0008] Preferably, the mass ratio of the base combined oil, the nano additive and the viscosity index improver is (60-75):(2.5-3.5):(4-5.2).

[0009] More preferably, the mass ratio of the base combination oil, nano additive and viscosity index improver is (68-72):(3-3.3):(4.4-4.8).

[0010] Preferably, the base combination oil is a combination of polyalkylene glycol and polyol ester and polymeric ester.

[0011] Preferably, the viscosity of the polyalkylene glycol is 30-40 cSt at 40°C.

[0012] More preferably, the viscosity of the polyalkylene glycol is 32-35 cSt at 40°C.

[0013] More preferably, the polyol ester is pentaerythritol tetra(2-ethylhexanoate) Priolube 3970.

[0014] More preferably, the polymeric ester is trimethylolpropane-adipic acid polymeric ester Priolube 1435.

[0015] In this application, polyalkylene glycol is combined with a specific type of polyol ester and polymeric ester as the main agent combination, which builds a molecular level synergistic protection system for the lubrication system of ultra-high speed racing engine. Its core advantage lies in solving the anti-wear failure problem of traditional lubricating oil under extreme working conditions above 20,000 rpm through multi-scale rheological control and interface energy optimization.

[0016] The ethylene oxide-propylene oxide block structure of polyalkylene glycol forms a rigid skeleton, which maintains the stability of the viscosity index in a high temperature shear field. The lone pair electrons of oxygen atoms between the molecular chains form a strong dipole with the metal surface, so that the basic adsorption layer of the lubricating oil film remains ≥1.8 nm at a high temperature of more than 200°C; the branched alkyl chain of pentaerythritol tetra(2-ethylhexanoate) provides an ultra-low friction interface, and the ethyl group at the β-carbon position produces a steric hindrance effect, reducing the boundary friction coefficient to below 0.03. At the same time, the carbonyl oxygen atoms of the ester group are connected with the anti-wear agent, generating a thin film in situ on the surface of the friction pair for repair; and the polymeric ester plays a molecular viscosity increasing function, and its suitable molecular weight and structure can form a tangled network with alkyl naphthalene base oil, still retaining good viscosity retention rate under ultra-high shear rate, and effectively blocking the corrosion and erosion of acidic wear debris to bearing alloy through the formation of ionic bonds.

[0017] Preferably, the mass ratio of the polyalkylene glycol, polyol ester and polymeric ester is (4-6):(1-2):(1-1.5).

[0018] More preferably, the mass ratio of the polyalkylene glycol, polyol ester and polymeric ester is (4.5-5.2):(1.5-1.6):(1.1-1.3).

[0019] Most preferably, the mass ratio of the polyalkylene glycol, the polyol ester and the polymeric ester is 4.6:1.5:1.3.

[0020] Preferably, the nano-additive is at least one of graphdiyne nanosheets, nano cerium oxide, nano lanthanum zirconate and molybdenum boron nitride nanotubes.

[0021] More preferably, the nano-additive is nano cerium oxide and / or nano lanthanum zirconate.

[0022] Most preferably, the nano-additive is a combination of nano cerium oxide and nano lanthanum zirconate.

[0023] Preferably, the mass ratio of the nano cerium oxide and the nano lanthanum zirconate is (5-7):(0.8-1.5).

[0024] More preferably, the mass ratio of the nano cerium oxide and the nano lanthanum zirconate is (5.5-6.3):(1-1.2).

[0025] Preferably, the dispersant is polyether-modified polysiloxane or perfluoroalkyl acrylate.

[0026] More preferably, the dispersant is polyether-modified polysiloxane.

[0027] Preferably, the anti-wear agent is at least one of sulfurized alkenyl cottonseed oil, trimcresyl phosphate, titanium naphthenate, boronized succinimide and chlorinated paraffin wax.

[0028] More preferably, the anti-wear agent is a combination of sulfurized alkenyl cottonseed oil and titanium naphthenate.

[0029] Preferably, the mass ratio of the sulfurized alkenyl cottonseed oil and the titanium naphthenate is (3-5):(0.5-0.8).

[0030] More preferably, the mass ratio of the sulfurized alkenyl cottonseed oil and the titanium naphthenate is (4-4.5):(0.5-0.6).

[0031] Preferably, the antioxidant is alkyl diphenylamine or dinonyl diphenylamine.

[0032] More preferably, the antioxidant is alkyl diphenylamine.

[0033] Preferably, the viscosity index improver is at least one of hydrogenated styrene-isoprene copolymer, ethylene-propylene copolymer, polyisobutylene and aminated polymethacrylate.

[0034] More preferably, the viscosity index improver is hydrogenated styrene-isoprene copolymer or polyisobutylene.

[0035] Most preferably, the viscosity index improver is polyisobutylene.

[0036] Preferably, the nanometer anti-wear lubricating oil for the ultra-high speed racing engine further comprises, in parts by mass, 4-14 parts of a functional complex agent, 0.5-1.5 parts of an antifoaming agent, 1.5-3 parts of a pour point depressant, and 2-4 parts of a corrosion inhibitor.

[0037] Preferably, the mass ratio of the base combined oil to the functional complex agent is (60-75):(7-12).

[0038] More preferably, the mass ratio of the base combined oil to the functional complex agent is (68-72):(9-11).

[0039] Preferably, the functional complex agent is a combination of di(4-tert-butylphenyl) selenide, triisooctyl vanadate, and tetrabutylammonium phosphotungstate heteropoly acid.

[0040] Preferably, the mass ratio of di(4-tert-butylphenyl) selenide, triisooctyl vanadate, and tetrabutylammonium phosphotungstate heteropoly acid is (1.5-2.5):(2.2-3):(1-1.6).

[0041] More preferably, the mass ratio of di(4-tert-butylphenyl) selenide, triisooctyl vanadate, and tetrabutylammonium phosphotungstate heteropoly acid is (1.8-2):(2.5-2.7):(1.3-1.4).

[0042] The functional composition of di(4-tert-butylphenyl) selenide, triisooctyl vanadate, and tetrabutylammonium phosphotungstate heteropoly acid salt realizes the comprehensive performance improvement of the lubricating oil through molecular-level joint action under extreme working conditions of the ultra-high speed racing engine. The phenyl selenol radicals generated by di(4-tert-butylphenyl) selenide combine with the hydroxyl radicals adsorbed on the friction interface to form a stable macromolecular passivation film, prolonging the oxidation induction period of the oil product, and the electrons released in the breaking process effectively inhibit the electrochemical corrosion of the electron-hole pairs at the tip of the micro-cracks. Triisooctyl vanadate undergoes thermal catalytic dissociation in the boundary lubrication zone, and the free vanadium ions are oxidized and deposited on the defect sites on the surface of the piston ring to generate a thin film with certain performance. On the other hand, the phosphotungstate heteropoly acid anion acts as a nanoscale charge carrier, capturing the metal debris generated by wear through the 3d empty orbit of the phosphorus atom in the high-speed shear field, catalyzing the oxidation of the metal debris to generate a repair layer with a layered structure, and self-assembling into a three-dimensional network conductive path through electrostatic force under the guidance of ions, thereby attenuating the static electric charge accumulation between the friction pairs and avoiding the oil film failure phenomenon.

[0043] Preferably, the antifoaming agent is at least one of the organic silicon antifoaming agents.

[0044] Preferably, the pour point depressant is at least one of polymethacrylate, alkyl naphthalene polymer, poly-alpha-olefin, and maleic anhydride-styrene copolymer.

[0045] More preferably, the pour point depressant is an alkyl naphthalene polymer and / or a polymethacrylate.

[0046] Preferably, the corrosion inhibitor is at least one of a thiadiazole derivative, a mercaptobenzimidazole, an alkyl succinic acid half ester, and barium dinonylnaphthalene sulfonate.

[0047] More preferably, the corrosion inhibitor is a mercaptobenzimidazole or an alkyl succinic acid half ester.

[0048] Most preferably, the corrosion inhibitor is a mercaptobenzimidazole.

[0049] A preparation method of the nano anti-wear lubricating oil for the ultra-high speed racing engine, comprising the following steps: S1: after preheating the base combined oil, a functional complexing agent is added for ultrasonic treatment, and then the temperature is raised to stirring to obtain a pre-activated liquid; S2: the pre-activated liquid is transferred to a high-pressure reaction kettle, and stirred and kept warm at a high temperature, after completion, the temperature is lowered, then gradiently lowered to 45℃, the remaining raw materials are sequentially added, finally a defoaming agent is added, after completion, the molecular sieve is dynamically adsorbed to ≤40ppm of moisture, then filtered, nitrogen-filled and packaged, and the nano anti-wear lubricating oil for the ultra-high speed racing engine is obtained.

[0050] More preferably, the preparation method of the nano anti-wear lubricating oil for the ultra-high speed racing engine, comprising the following specific steps: S1: the base combined oil is preheated at 40~50℃, then a functional complexing agent is added for ultrasonic treatment at 35~40kHz and 200~300W for 20~25min, then the temperature is raised to 80~85℃, and stirred at 80~100rpm for 60~80min to obtain a pre-activated liquid; S2: the pre-activated liquid is transferred to a high-pressure reaction kettle, and stirred and kept warm at 70~90rpm at 110~130℃ for 1.5~2h, after completion, the temperature is lowered to 70~80℃, then gradiently lowered to 45℃, the remaining raw materials are sequentially added, finally a defoaming agent is added, after completion, the molecular sieve is dynamically adsorbed for 6~8h to ≤40ppm of moisture, then filtered, nitrogen-filled and packaged, and the nano anti-wear lubricating oil for the ultra-high speed racing engine is obtained.

[0051] The present application has practical significance and beneficial effects:

[0052] 1、The nano anti-wear lubricating oil finally prepared in the present application not only can maintain excellent wear resistance, but also has good thermal stability and long-term lubrication durability, and greatly reduces the probability of easy rupture of the lubricating film and long-time use failure under extreme working conditions, greatly meeting the use quality and service life requirements of existing high-speed racing engines for lubricating oil.

[0053] 2, The polyalkylene glycol is combined with a specific type of polyol ester and polymeric ester as a main agent in the application, which builds a molecular-level synergistic protection system for the lubricating system of a super-high-speed racing engine. The core advantage is to solve the anti-wear failure problem of traditional lubricating oil under extreme working conditions above 20,000 rpm through multi-scale rheological control and interface energy optimization.

[0054] 3, The application further comprises a functional composition composed of di(4-tert-butylphenyl) selenide, triisooctyl vanadate, and phosphotungstic heteropoly acid tetrabutylammonium salt to realize the comprehensive performance improvement of the lubricating oil through molecular-level interaction under extreme working conditions of the super-high-speed racing engine. BRIEF DESCRIPTION OF DRAWINGS

[0055] Figure 1 The product physical map of the nano anti-wear lubricating oil for the super-high-speed racing engine prepared in the embodiment of the application.

[0056] Figure 2 The detection report result map of the nano anti-wear lubricating oil for the super-high-speed racing engine prepared in the embodiment of the application.

[0057] Figure 3 The rapid aging test comparison map of the nano anti-wear lubricating oil for the super-high-speed racing engine prepared in the embodiment and the comparative example of the application.

[0058] Figure 3 Medium: (a) Example 1; (b) Comparative Example 1; (c) Comparative Example 3; (d) Comparative Example 4. DETAILED DESCRIPTION

[0059] Example 1

[0060] A nano anti-wear lubricating oil for a super-high-speed racing engine, by mass parts, the raw materials include: base combined oil 70.5 parts, nano additive 3.1 parts, dispersant 1.8 parts, anti-wear agent 5.5 parts, antioxidant 1.3 parts, viscosity index improver 4.5 parts, functional composite agent 10.2 parts, defoaming agent 0.8 parts, pour point depressant 2.2 parts, and corrosion inhibitor 2.6 parts.

[0061] The base combined oil is a composition of polyalkylene glycol and polyol ester and polymeric ester, with a mass ratio of 4.6:1.5:1.3.

[0062] The viscosity of the polyalkylene glycol is 33.5 cSt at 40°C, PLURACAST 600, BASF, Germany.

[0063] The polyol ester is pentaerythritol tetra(2-ethylhexanoate) Priolube 3970, Ineos, UK; and the polymeric ester is trimethylolpropane-adipic acid polymeric ester Priolube 1435, Croda, UK.

[0064] The nano additive is a combination of nano cerium oxide and nano lanthanum zirconate, with a mass ratio of 6:1; the average particle size of the nano cerium oxide is 40 nm; and the average particle size of the nano lanthanum zirconate is 110 nm.

[0065] The dispersant is polyether modified polysiloxane Dispers 755 from Germany Wacker; and the antioxidant is alkyl diphenylamine.

[0066] The anti-wear agent is a combination of vulcanized ene cottonseed oil and titanium naphthenate, with a mass ratio of 4.4:0.6.

[0067] The viscosity index improver is polyisobutylene PB2400 from China Hunan Jin Yu Fine Chemicals.

[0068] The functional complexing agent is a combination of di(4-tert-butylphenyl) selenide, triisooctyl vanadate and phosphotungstic heteropoly acid tetrabutylammonium, with a mass ratio of 2:2.7:1.3.

[0069] The defoaming agent is silicone defoaming agent BYK-066N.

[0070] The pour point depressant is a poly methacrylate of industrial grade from China Hubei Ruishengxiang Science and Technology.

[0071] The corrosion inhibitor is mercapto benzimidazole.

[0072] A preparation method of the nano anti-wear lubricating oil for the super-high speed racing engine, comprising the following specific steps: S1: preheat the base combined oil at 45℃, then add the functional complexing agent, and ultrasonically treat at 40 kHz and 300 W for 25 min, then heat to 80℃, and stir at 100 rpm for 70 min to obtain a pre-activated liquid; S2: transfer the pre-activated liquid to a high-pressure reaction kettle, and stir at 80 rpm at 125℃ for 2 h, then cool to 75℃, and then gradiently cool to 45℃, sequentially add the remaining raw materials, finally add the defoaming agent, complete the addition, and then dynamically adsorb with molecular sieves for 8 h until the moisture content is ≤40 ppm, then filter, nitrogen seal, and obtain the product.

[0073] The product of the nano anti-wear lubricating oil for the super-high speed racing engine prepared in this embodiment is shown in Figure 1 .

[0074] The product testing report result of the nano anti-wear lubricating oil for the super-high speed racing engine prepared in this embodiment is shown in Figure 2 .

[0075] Example 2

[0076] The present example is identical with example 1 except for the following difference: A nano anti-wear lubricating oil for super high speed racing engine, raw materials include, by mass parts: base combined oil 65.5 parts, nano additive 2.8 parts, dispersant 1.8 parts, anti-wear agent 5.5 parts, antioxidant 1.3 parts, viscosity index improver 4.1 parts, functional complex agent 8.2 parts, defoaming agent 0.6 parts, pour point depressant 2.2 parts and corrosion inhibitor 2.6 parts.

[0077] The base combined oil is a composition of polyalkylene glycol and polyol ester and polymeric ester, mass ratio 5.5:1.2:1.5.

[0078] The other embodiments are identical.

[0079] Example 3

[0080] The present example is identical with example 1 except for the following difference: A nano anti-wear lubricating oil for super high speed racing engine, raw materials include, by mass parts: base combined oil 75 parts, nano additive 3.2 parts, dispersant 1.8 parts, anti-wear agent 5.5 parts, antioxidant 1.3 parts, viscosity index improver 5 parts, functional complex agent 11.8 parts, defoaming agent 0.8 parts, pour point depressant 2.2 parts and corrosion inhibitor 2.6 parts.

[0081] The functional complex agent is a composition of di(4-tert-butylphenyl) selenide, triisooctyl vanadate and phosphotungstic heteropoly acid tetrabutylammonium, mass ratio 2.4:2.2:1.

[0082] The other embodiments are identical.

[0083] Comparative Example 1

[0084] The present example is identical with example 1 except for the following difference: A nano anti-wear lubricating oil for super high speed racing engine, raw materials include, by mass parts: base combined oil 78.5 parts, nano additive 3.1 parts, dispersant 1.8 parts, anti-wear agent 5.5 parts, antioxidant 1.3 parts, viscosity index improver 4.5 parts, functional complex agent 2.2 parts, defoaming agent 0.8 parts, pour point depressant 2.2 parts and corrosion inhibitor 2.6 parts.

[0085] The other embodiments are identical.

[0086] Comparative Example 2

[0087] The present example is identical with example 1 except for the following difference: A nano anti-wear lubricating oil for super high speed racing engine, raw materials include, by mass parts: base combined oil 60.5 parts, nano additive 3.1 parts, dispersant 1.8 parts, anti-wear agent 5.5 parts, antioxidant 1.3 parts, viscosity index improver 4.5 parts, functional complex agent 20.5 parts, defoaming agent 0.8 parts, pour point depressant 2.2 parts and corrosion inhibitor 2.6 parts.

[0088] The further embodiments are identical.

[0089] Comparative Example 3

[0090] The present comparative example differs from Example 1 only in that the base combination oil is a composition of polyalkylene glycol and polyol ester and polymeric ester in a mass ratio of 7:0.5:0.5.

[0091] The further embodiments are identical.

[0092] Comparative Example 4

[0093] The present comparative example differs from Example 1 only in that the base combination oil is a composition of polyalkylene glycol and polyol ester and polymeric ester in a mass ratio of 2:4:1.

[0094] The further embodiments are identical.

[0095] Comparative Example 5

[0096] The present comparative example differs from Example 1 only in that the functional complexing agent is a composition of di(4-tert-butylphenyl) selenide and phosphotungstic heteropoly acid tetrabutylammonium in a mass ratio of 4:1.6.

[0097] The further embodiments are identical.

[0098] Comparative Example 6

[0099] The present comparative example differs from Example 1 only in that the functional complexing agent is a composition of di(4-tert-butylphenyl) selenide, triisooctyl vanadate and phosphotungstic heteropoly acid tetrabutylammonium in a mass ratio of 1:3:2.

[0100] The further embodiments are identical.

[0101] Performance Test

[0102] 1. Wear resistance: FZG 340 / 1 gearbox, load level: Stage 1 to Stage 16, rotation speed: 1460 rpm, oil temperature: 90±2℃, test period: 15 minutes per stage, total time 4h; test method: gear immersed in 250 mL of lubricating oil to be tested in the example and comparative example, pre-wear 60 min (Stage 8 load), load gradually increased (each stage +1), vibration acceleration and temperature rise were monitored; the concentration peak of ferrography abrasive particles was taken as the result, and the result was recorded in Table 1 as the average of 10 tests.

[0103] 2. Thermal stability: reference standard ASTM D7097, temperature: 240°C, pressure: 3.5 MPa, catalytic medium: copper / iron / aluminum metal coil, time 50h; test method: 200 mL of oil sample was injected into the autoclave, the metal coil was inserted for catalysis, and oxygen was continuously passed at constant temperature and pressure, with a flow rate of 2 L / h, and the final viscosity change rate was taken, and the results were recorded in Table 1 as the average of 10 tests.

[0104] 3. Durability: the engine was a Chrysler 2.4L inline four-cylinder with a compression ratio of 11.3:1; the output torque was 135 N·m at a constant speed of 4000 rpm, and the oil temperature was 150±2°C for 150h; test method: the engine was assembled with new bearings / piston rings, and 5.7L of the test lubricating oil was added, and after the test, the weight loss of the crankshaft bearing was taken, and the results were recorded in Table 1 as the average of 10 tests.

[0105] 4. Extreme pressure test: the test was performed according to ISO 19291, and the SRV-4 high-frequency friction tester was used, with a load of 50 to 5000N in steps, a frequency of 50Hz, a stroke of 1.0mm, and a temperature of 100°C, and the average wear scar diameter at the limit load was recorded, and the results were recorded in Table 1 as the average of 10 tests.

[0106] 5. Rapid aging test: the rapid aging test was performed on Example 1, Comparative Example 1, Comparative Example 2, and Comparative Example 3, respectively, under the following conditions: 200°C, Chrysler 2.4L inline four-cylinder engine, 4000rpm constant speed, output torque 135N·m, test duration 150h, and the lubricating oil was collected and directly compared, and the results of the comparative examples are shown in Table 1. Figure 3

[0107] Table 1 Performance test results

[0108] Example Abrasive grain concentration peak (ppm) Viscosity change rate (%) Crankshaft bearing weight loss (mg) Abrasion spot diameter (mm) Example 1 68.6 3.41 8.2 0.282 Example 2 70.5 3.39 9.6 0.299 Example 3 69.1 3.58 8.9 0.295 Comparative Example 1 97.6 5.24 25.6 0.403 Comparative Example 2 90.6 4.97 22.4 0.384 Comparative Example 3 83.2 4.55 17.6 0.364 Comparative Example 4 84.1 4.68 15.5 0.342 Comparative Example 5 80.3 4.77 14.6 0.331 Comparative Example 6 81.7 4.70 15.2 0.358

[0109] From the final test and results, it can be seen that Examples 1-3 have achieved more excellent results in various performance aspects compared to Comparative Examples 1-6, and the comprehensive performance is much better than the test results of Comparative Examples 1-6. This is because Examples 1-3 use the appropriate amount and ratio of polyalkylene glycol, specific type of polyol ester, and polymeric ester as the main agent combination in the application, which forms a molecular-level synergistic protection system for the lubrication system of the super-high-speed racing engine, effectively enhancing the overall performance of the system. However, Comparative Examples 1 and 2 do not use the defined corresponding scheme ratio, which not only affects the synergistic protection system, but also further increases the instability of the internal molecules of the lubricating oil system, thereby causing a significant decrease in its own performance and storage, aging resistance, and ultimately quality problems.

[0110] ​The comparative examples 3-6 respectively use different base oil and functional complexing agent than the defined technical solution, which results in the decline of the molecular level synergistic protection inside the lubricating system, significantly reduces the performance, and leads to more obvious heat and aging resistance problems of the lubricating oil system.

[0111] Finally, in the comparison of the rapid aging test, it can be obviously observed that the lubricating oil prepared in example 1 can still maintain good lubricating oil quality in the rapid aging test, and no bubbles, condensation sedimentation and discoloration phenomenon occur. On the contrary, comparative example 1, comparative example 2 and comparative example 3 respectively use unsuitable raw material ratio and base oil phase ratio, which leads to the occurrence of bubbles, condensation sedimentation and discoloration, thereby directly affecting the application life and quality of the lubricating oil.

Claims

1. A nano-anti-wear lubricant for ultra-high speed racing car engines, characterized in that: The raw materials comprise at least, in mass parts, 50-80 parts of base combined oil, 2-4 parts of nano additive, 1-2 parts of dispersant, 3-8 parts of anti-wear agent, 1-3 parts of antioxidant, 3-6 parts of viscosity index improver, 4-14 parts of functional complexing agent, 0.5-1.5 parts of defoaming agent, 1.5-3 parts of pour point depressant and 2-4 parts of corrosion inhibitor; The base combined oil is a combination of polyalkylene glycol and polyol ester and polymeric ester, with a mass ratio of (4-6):(1-2):(1-1.5); The polyol ester is pentaerythritol tetra(2-ethylhexanoate) Priolube 3970, and the polymeric ester is trimethylolpropane-adipic acid polymeric ester Priolube 1435; The mass ratio of the base combined oil to the functional complexing agent is (60-75):(7-12); The functional complexing agent is a combination of di(4-tert-butylphenyl) selenide, triisooctyl vanadate and phosphotungstic acid tetrabutylammonium, with a mass ratio of (1.5-2.5):(2.2-3):(1-1.6).

2. The nanolubricant for use in ultra-high-rotation racing engines according to claim 1, characterized in that: The mass ratio of the base combined oil, the nano additive and the viscosity index improver is (60-75):(2.5-3.5):(4-5.2).

3. The nanolubricant for use in ultra-high-rotation racing engines according to claim 2, characterized in that: The nano additive is at least one of graphyne nanosheet, nano cerium oxide, nano lanthanum zirconate and molybdenum boron nitride nanotube.

4. The nano anti-wear lubricating oil for ultra-high speed racing engine according to claim 3, characterized in that: The dispersant is polyether-modified polysiloxane or perfluoroalkyl acrylate.

5. The nanolubricant for use in ultra-high-rotation racing engines according to claim 4, characterized in that: The anti-wear agent is at least one of sulfurized alkenyl cottonseed oil, trimethylphenyl phosphate, titanium naphthenate, boronized succinimide and chlorinated paraffin wax.

6. The nanolubricant for use in ultra-high-rotation racing engines according to claim 5, characterized in that: The pour point depressant is alkyl naphthalene polymer and / or polymethacrylate.

7. A method for preparing the nano-antiwear lubricating oil for ultra-high speed racing engine according to any one of claims 1-6, characterized in that: S1: After preheating the base combined oil, the functional complexing agent is added for ultrasonic treatment, and then the temperature is raised to stirring to obtain a pre-activated liquid; S2: The pre-activated liquid is transferred to a high-pressure reaction kettle, stirred and kept warm at high temperature, cooled after completion, then gradiently cooled to 45℃, the remaining raw materials are sequentially added, and finally the defoaming agent is added, after completion, the molecular sieve is dynamically adsorbed to the moisture ≤40ppm, then filtered, filled with nitrogen and packaged, and the product is obtained.

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