Lubricating oil composition with high and low temperature resistance and wear resistance and preparation method thereof

Abstract

The invention relates to the technical field of lubricating oil, in particular to a high and low temperature resistant and wear resistant lubricating oil composition and a preparation method thereof. The lubricating oil composition is prepared from the following raw material components in parts by weight: 60 to 90 parts of poly-alpha olefin, 20 to 30 parts of linseed oil, 0.5 to 1 part of antioxidant 168, 0.03 to 0.05 part of antirust agent T705, 2 to 3 parts of modified organic silicon polymer and 0.8 to 1.2 parts of modified SiO2.

Description

Technical Field

[0001] This invention relates to the field of lubricating oil technology, and more specifically to a high and low temperature resistant and wear-resistant lubricating oil composition and its preparation method. Background Technology

[0002] Lubricating oil is a liquid or semi-solid lubricant used in various types of automobiles and machinery to reduce friction and protect machinery and processed parts. Its main functions include lubrication, cooling, rust prevention, cleaning, sealing, and buffering. Lubricating oil generally consists of two parts: base oil and additives. Base oil is the main component of lubricating oil, determining its basic properties, while additives compensate for and improve the shortcomings of the base oil, imparting certain new properties and forming an important part of the lubricating oil composition. Lubricating oil base oils are mainly divided into three categories: mineral base oils, synthetic base oils, and bio-based base oils. With technological advancements, higher demands are placed on the performance of lubricating oils. Machinery generates a large amount of heat during operation, raising the operating temperature of the lubricating oil. However, existing lubricating oils, due to poor high-temperature dispersibility and other reasons, do not possess excellent high-temperature resistance and have poor lubricity at high temperatures, failing to meet the needs of high-temperature environments. Furthermore, in some special environments, such as low-temperature mechanical operation, traditional mineral lubricating oils, due to their excessively high viscosity at low temperatures, are difficult to form effective lubrication. Summary of the Invention

[0003] In view of the shortcomings of the prior art, the present invention proposes a high and low temperature resistant and wear-resistant lubricating oil composition and its preparation method.

[0004] This invention is achieved through the following technical solution: A high and low temperature resistant and wear-resistant lubricating oil composition is prepared by means of the following components in parts by weight: 60-90 parts of polyalphaolefin (PAO8), 20-30 parts of linseed oil, 0.5-1 parts of antioxidant 168, 0.03-0.05 parts of rust inhibitor T705, 2-3 parts of modified organosilicon polymer, and 0.8-1.2 parts of modified SiO2.

[0005] Furthermore, the preparation method of the modified organosilicon polymer includes the following steps: L1. Eugenol, triethylamine, and ethyl acetate were mixed in an ice-water bath and stirred under a nitrogen atmosphere to dissolve them, resulting in a mixture. Phenylphosphoryl dichloride was dissolved in ethyl acetate and added dropwise to the mixture. The addition was completed in 30 min. The mixture was kept at 0-5℃ for 1 h and reacted at 25℃ for 48 h. The mixture was filtered, and the filtrate was washed with 2 mol / L NaOH aqueous solution and deionized water. It was dried over anhydrous magnesium sulfate, filtered, and the ethyl acetate was removed by rotary evaporation. The mixture was dried to obtain the intermediate. L2. Take the intermediate obtained in step L1, Karstedt catalyst (3000 ppm) and toluene, mix them, stir for 30 min under nitrogen atmosphere, heat to 90℃, add 1,1,3,3-tetramethyldisiloxane dropwise, keep warm at 85℃ for 3-4 h, cool, add activated carbon powder at a ratio of 0.1 g / mL and stir for 1 h, filter, and evaporate under reduced pressure. L3. Take the product obtained in step L2, 2,2'-(1,2-ethylenedioxy)diethylthiol, benzoin dimethyl ether and tetrahydrofuran, mix them, stir and react under 365 nm ultraviolet light for 30 min, evaporate under reduced pressure, wash with methanol, dry, and obtain the modified organosilicon polymer.

[0006] Furthermore, in step L1, the molar ratio of eugenol, triethylamine, and phenylphosphodichloro is 2:2.4:1.

[0007] Furthermore, in step L1, the molar concentration of triethylamine in ethyl acetate is 1.6 mmol / mL.

[0008] Further, in step L1, the molar concentration of the phenylphosphodichloro in ethyl acetate is 0.5 mmol / mL.

[0009] Furthermore, in step L2, the mass concentration of the intermediate in toluene is 0.5 g / mL.

[0010] Furthermore, in step L2, the amount of the Karstedt catalyst is 1.2 wt% of the intermediate.

[0011] Further, in step L2, the mass ratio of the intermediate to 1,1,3,3-tetramethyldisiloxane is 7:1.

[0012] Further, in step L3, the ratio of the product obtained in L2, 2,2'-(1,2-ethylenedioxy)diethylthiol, benzoin dimethyl ether, and tetrahydrofuran is 6 g:1 g:0.2 g:10 mL.

[0013] Furthermore, the method for preparing the modified SiO2 includes the following steps: V1. Nano-SiO2 was ultrasonically dispersed in dichloromethane, chloroethyl isocyanate and stannous octoate were added, stirred evenly, reacted at 80℃ for 6-8 h, centrifuged, the precipitate was washed with dichloromethane, and dried under vacuum to obtain chloroethyl isocyanate-SiO2. V2. The chloroethyl isocyanate-SiO2 obtained in step V1 was added to acetonitrile and ultrasonically dispersed. N-methylimidazolium was added and stirred until homogeneous. The mixture was reacted at 85°C for 28-30 h under nitrogen protection. After centrifugation, the precipitate was washed and dried under vacuum to obtain modified SiO2.

[0014] Further, in step V1, the mass concentration of the nano-SiO2 in dichloromethane is 40-50 mg / mL.

[0015] Further, in step V1, the mass ratio of the chloroethyl isocyanate to nano-SiO2 is 1:1.5-2.

[0016] Further, in step V1, the amount of stannous octoate used is 0.8-1 wt% of chloroethyl isocyanate.

[0017] Further, in step V2, the mass concentration of the chloroethyl isocyanate-SiO2 in acetonitrile is 50 mg / mL.

[0018] Further, in step V2, the mass ratio of N-methylimidazolium to chloroethyl isocyanate-SiO2 is 1:2-3.

[0019] Furthermore, the present invention also provides a method for preparing the high and low temperature resistant and wear-resistant lubricating oil composition, comprising the following steps: at 50-60°C, polyalphaolefin (PAO8), linseed oil, antioxidant 16, rust inhibitor T705, modified organosilicon polymer, and modified SiO2 are mixed in parts by weight, dispersed evenly, and then restored to room temperature to obtain the high and low temperature resistant and wear-resistant lubricating oil composition.

[0020] Compared with the prior art, the present invention has the following beneficial effects: This invention provides a high and low temperature resistant and wear-resistant lubricating oil composition and its preparation method. Modified organosilicon polymer and modified SiO2 are introduced and compounded with base oil to achieve synergistic effect among the components. The final product has excellent lubrication and wear resistance, thermal stability and low temperature fluidity under extreme temperature conditions. This invention prepares a modified organosilicon polymer. The phenolic hydroxyl group of eugenol is reacted with phenylphosphodichloro to obtain an intermediate, introducing a double bond group from eugenol to provide a basis for subsequent reactions. The intermediate is then subjected to a hydrosilylation reaction with 1,1,3,3-tetramethyldisiloxane to obtain a product containing double bonds and siloxane segments. Subsequently, the modified organosilicon polymer is obtained by polymerization with 2,2'-(1,2-ethylenedioxy)bis(ethyl mercaptan) via an olefin-thiol click reaction. This invention introduces eugenol groups, siloxane segments, thioether bonds, and ether bonds through chemical bonds, which can effectively improve high and low temperature resistance. The modified organosilicon polymer contains siloxane segments and COC segments, exhibiting good flexibility. The molecular segments are not easily solidified at low temperatures. When added to oils, it can effectively interfere with the ordered arrangement and crystallization process of base oil molecules at low temperatures. The modified organosilicon polymer has a higher silicon-oxygen bond energy than a carbon-carbon bond, improving thermal stability and oxidation resistance. It is less prone to chain breakage and decomposition at high temperatures, allowing it to continuously perform its film-forming and lubricating functions. The modified organosilicon polymer incorporates phosphorus- and sulfur-containing groups, enhancing its adsorption on metal surfaces and reducing friction. This invention prepares modified SiO2 by reacting the isocyanate groups of chloroethyl isocyanate with the hydroxyl groups on the surface of nano-SiO2, introducing chlorine atoms onto the SiO2 surface. Subsequently, these chlorine atoms are reacted with N-methylimidazole to obtain modified SiO2. During lubrication, the nanoparticles can roll between friction pairs, reducing the coefficient of friction. They can fill microscopic pits on the metal surface, acting as a micro-bearing effect and providing repair and filling, further enhancing wear resistance. This invention's modified SiO2, through surface grafting of N-methylimidazole-based ionic liquid structures, endows SiO2 nanoparticles with excellent high-temperature stability and dispersion stability. Ionic liquids inherently possess low volatility, non-flammability, and high thermal stability, preventing nanoparticles from agglomerating at high temperatures and ensuring their uniform dispersion in oil, thus providing long-term anti-wear and viscosity-regulating effects. Modified SiO2 nanoparticles, due to the modification of their surface organic ionic liquid structure, exhibit good compatibility with base oils and do not form agglomeration nuclei that lead to oil gelation at low temperatures, further enhancing low-temperature fluidity. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only for this invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 The wear scar diameters are those of the lubricating oil compositions described in Examples 1-3 and Comparative Examples 1-5 of this invention. Figure 2 The flash point and pour point of the lubricating oil compositions described in Examples 1-3 and Comparative Examples 1-5 of this invention; Figure 3 The viscosity index is the viscosity index of the lubricating oil compositions described in Examples 1-3 and Comparative Examples 1-5 of this invention. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments. However, this invention is not limited to the following embodiments. It should be noted that, unless otherwise specified, all chemical reagents involved in this invention are purchased through commercial channels.

[0024] Example 1: A lubricating oil composition with high and low temperature resistance and wear resistance, the raw materials for preparation include the following components in parts by weight: 90 parts of polyalphaolefin (PAO8), 30 parts of linseed oil, 1 part of antioxidant 168, 0.05 parts of rust inhibitor T705, 3 parts of modified organosilicon polymer, and 1.2 parts of modified SiO2.

[0025] A method for preparing modified organosilicon polymers includes the following steps: L1. In an ice-water bath, 0.2 mol of eugenol, 0.24 mol of triethylamine, and 150 mL of ethyl acetate were mixed and stirred under a nitrogen atmosphere to obtain a mixture. 0.1 mol of phenylphosphodichloroisocyanurate was dissolved in 200 mL of ethyl acetate and added dropwise to the mixture. The addition was completed in 30 min. The mixture was kept at 5 °C for 1 h and reacted at 25 °C for 48 h. After filtration, the filtrate was washed with 2 mol / L NaOH aqueous solution and deionized water, dried over anhydrous magnesium sulfate, filtered, and the ethyl acetate was removed by rotary evaporation. After drying, the intermediate was obtained. L2. Take 14 g of the intermediate obtained in step L1, 0.168 g of Karstedt catalyst (3000 ppm) and 28 mL of toluene, mix well, stir for 30 min under nitrogen atmosphere, heat to 90℃, add 2 g of 1,1,3,3-tetramethyldisiloxane dropwise, keep warm at 85℃ for 4 h, cool, add activated carbon powder at a ratio of 0.1 g / mL and stir for 1 h, filter, and evaporate under reduced pressure. L3. Take 12 g of the product obtained in step L2, 2 g of 2,2'-(1,2-ethylenedioxy)diethylthiol, 0.4 g of benzoin dimethyl ether and 20 mL of tetrahydrofuran, mix them well, stir and react for 30 min under 365 nm ultraviolet light, evaporate under reduced pressure, wash with methanol, and dry to obtain the modified organosilicon polymer.

[0026] The preparation method of modified SiO2 includes the following steps: V1. 2 g of nano-SiO2 was ultrasonically dispersed in 40 mL of dichloromethane, 1 g of chloroethyl isocyanate and 10 mg of stannous octoate were added, stirred evenly, reacted at 80 °C for 8 h, centrifuged, the precipitate was washed with dichloromethane and dried under vacuum to obtain chloroethyl isocyanate-SiO2. V2. Add 1.5 g of chloroethyl isocyanate-SiO2 obtained in step V1 to 30 mL of acetonitrile and disperse by ultrasonication. Add 0.5 g of N-methylimidazole and stir until homogeneous. React at 85 °C for 30 h under nitrogen protection. Centrifuge, wash the precipitate, and dry under vacuum to obtain modified SiO2.

[0027] This embodiment also provides a method for preparing the high and low temperature resistant and wear-resistant lubricating oil composition, including the following steps: at 60°C, polyalphaolefin (PAO8), linseed oil, antioxidant 16, rust inhibitor T705, modified organosilicon polymer, and modified SiO2 are mixed in parts by weight, dispersed evenly, and then restored to room temperature to obtain the high and low temperature resistant and wear-resistant lubricating oil composition.

[0028] Example 2: A high and low temperature resistant and wear-resistant lubricating oil composition, the raw materials for preparation include the following components in parts by weight: 60 parts of polyalphaolefin (PAO8), 20 parts of linseed oil, 0.5 parts of antioxidant 168, 0.03 parts of rust inhibitor T705, 2 parts of modified organosilicon polymer, and 0.8 parts of modified SiO2.

[0029] A method for preparing modified organosilicon polymers includes the following steps: L1. In an ice-water bath, 0.2 mol of eugenol, 0.24 mol of triethylamine, and 150 mL of ethyl acetate were mixed and dissolved under a nitrogen atmosphere to obtain a mixture. 0.1 mol of phenylphosphodichloroisocyanurate was dissolved in 200 mL of ethyl acetate and added dropwise to the mixture. The addition was completed in 30 min. The mixture was kept at 0 °C for 1 h and reacted at 25 °C for 48 h. After filtration, the filtrate was washed with 2 mol / L NaOH aqueous solution and deionized water, dried over anhydrous magnesium sulfate, filtered, and the ethyl acetate was removed by rotary evaporation. After drying, the intermediate was obtained. L2. Take 14 g of the intermediate obtained in step L1, 0.168 g of Karstedt catalyst (3000 ppm) and 28 mL of toluene, mix well, stir for 30 min under nitrogen atmosphere, heat to 90℃, add 2 g of 1,1,3,3-tetramethyldisiloxane dropwise, keep warm at 85℃ for 3 h, cool, add activated carbon powder at a ratio of 0.1 g / mL and stir for 1 h, filter, and evaporate under reduced pressure. L3. Take 12 g of the product obtained in step L2, 2 g of 2,2'-(1,2-ethylenedioxy)diethylthiol, 0.4 g of benzoin dimethyl ether and 20 mL of tetrahydrofuran, mix them well, stir and react for 30 min under 365 nm ultraviolet light, evaporate under reduced pressure, wash with methanol, and dry to obtain the modified organosilicon polymer.

[0030] The preparation method of modified SiO2 includes the following steps: V1. 1.5 g of nano-SiO2 was ultrasonically dispersed in 37.5 mL of dichloromethane, 1 g of chloroethyl isocyanate and 8 mg of stannous octoate were added, stirred evenly, reacted at 80 °C for 6 h, centrifuged, the precipitate was washed with dichloromethane, and dried under vacuum to obtain chloroethyl isocyanate-SiO2. V2. Add 1 g of chloroethyl isocyanate-SiO2 obtained in step V1 to 20 mL of acetonitrile and disperse by ultrasonication. Add 0.5 g of N-methylimidazole and stir until homogeneous. React at 85 °C for 28 h under nitrogen protection. Centrifuge, wash the precipitate, and dry under vacuum to obtain modified SiO2.

[0031] This embodiment also provides a method for preparing the high and low temperature resistant and wear-resistant lubricating oil composition, including the following steps: at 50°C, polyalphaolefin (PAO8), linseed oil, antioxidant 16, rust inhibitor T705, modified organosilicon polymer, and modified SiO2 are mixed in parts by weight, dispersed evenly, and then restored to room temperature to obtain the high and low temperature resistant and wear-resistant lubricating oil composition.

[0032] Example 3: A high and low temperature resistant and wear-resistant lubricating oil composition, the raw materials for preparation include the following components in parts by weight: 75 parts of polyalphaolefin (PAO8), 25 parts of linseed oil, 0.8 parts of antioxidant 168, 0.04 parts of rust inhibitor T705, 2.5 parts of modified organosilicon polymer, and 1 part of modified SiO2.

[0033] A method for preparing modified organosilicon polymers includes the following steps: L1. In an ice-water bath, 0.2 mol of eugenol, 0.24 mol of triethylamine, and 150 mL of ethyl acetate were mixed and stirred under a nitrogen atmosphere to obtain a mixture. 0.1 mol of phenylphosphodichloroisocyanurate was dissolved in 200 mL of ethyl acetate and added dropwise to the mixture. The addition was completed in 30 min. The mixture was kept at 4 °C for 1 h and reacted at 25 °C for 48 h. After filtration, the filtrate was washed with 2 mol / L NaOH aqueous solution and deionized water, dried over anhydrous magnesium sulfate, filtered, and the ethyl acetate was removed by rotary evaporation. After drying, the intermediate was obtained. L2. Take 14 g of the intermediate obtained in step L1, 0.168 g of Karstedt catalyst (3000 ppm) and 28 mL of toluene, mix well, stir for 30 min under nitrogen atmosphere, heat to 90℃, add 2 g of 1,1,3,3-tetramethyldisiloxane dropwise, keep warm at 85℃ for 3.5 h, cool, add activated carbon powder at a ratio of 0.1 g / mL and stir for 1 h, filter, and evaporate under reduced pressure. L3. Take 12 g of the product obtained in step L2, 2 g of 2,2'-(1,2-ethylenedioxy)diethylthiol, 0.4 g of benzoin dimethyl ether and 20 mL of tetrahydrofuran, mix them well, stir and react for 30 min under 365 nm ultraviolet light, evaporate under reduced pressure, wash with methanol, and dry to obtain the modified organosilicon polymer.

[0034] The preparation method of modified SiO2 includes the following steps: V1. 1.8 g of nano-SiO2 was ultrasonically dispersed in 40 mL of dichloromethane, 1 g of chloroethyl isocyanate and 9 mg of stannous octoate were added, stirred evenly, reacted at 80 °C for 7 h, centrifuged, the precipitate was washed with dichloromethane, and dried under vacuum to obtain chloroethyl isocyanate-SiO2. V2. Add 1.5 g of chloroethyl isocyanate-SiO2 obtained in step V1 to 30 mL of acetonitrile and disperse by ultrasonication. Add 0.6 g of N-methylimidazole and stir until homogeneous. React at 85 °C for 29 h under nitrogen protection. Centrifuge, wash the precipitate, and dry under vacuum to obtain modified SiO2.

[0035] This embodiment also provides a method for preparing the high and low temperature resistant and wear-resistant lubricating oil composition, including the following steps: at 55°C, polyalphaolefin (PAO8), linseed oil, antioxidant 16, rust inhibitor T705, modified organosilicon polymer, and modified SiO2 are mixed in parts by weight, dispersed evenly, and then restored to room temperature to obtain the high and low temperature resistant and wear-resistant lubricating oil composition.

[0036] The only difference between Comparative Example 1 and Example 1 is that 1,7-octadiene is used instead of the intermediate.

[0037] The only difference between Comparative Example 2 and Example 1 is that the modified organosilicon polymer is replaced with the product obtained in step L2.

[0038] The only difference between Comparative Example 3 and Example 1 is that nano-SiO2 is used instead of modified SiO2.

[0039] The only difference between Comparative Example 4 and Example 1 is that no modified organosilicon polymer was added.

[0040] The only difference between Comparative Example 5 and Example 1 is that no modified SiO2 is added.

[0041] Example 1: Tribological properties were tested using a four-ball friction and wear testing machine. Test conditions: room temperature (25℃), load 392 N, rotational speed 1450 r / min, test time 30 min. The steel balls used were GCr15 steel balls, 12.7 mm in diameter, with a hardness of HRC59-61. The wear scar diameter of the steel balls was measured, and the results are as follows: Figure 1 As shown.

[0042] Figure 1 The results showed that the wear scar diameters of Examples 1-3 were significantly lower than those of Comparative Examples 1-5, indicating that the components of the lubricating oil prepared by this invention have a synergistic effect and high anti-wear performance. In Comparative Example 1, the modified organosilicon polymer was replaced with the product obtained in step L2; in Comparative Example 2, the intermediate was replaced with 1,7-octadiene; in Comparative Example 3, the modified SiO2 was replaced with nano-SiO2; in Comparative Example 4, no modified organosilicon polymer was added; and in Comparative Example 5, no modified SiO2 was added. In all these cases, the wear scar diameter increased, and the anti-wear performance decreased.

[0043] Experimental Example 2: The lubricating oil compositions prepared in Examples 1-3 and Comparative Examples 1-5 were subjected to high-temperature and low-temperature performance tests. The flash point of the lubricating oil compositions was determined according to GB / T3536 "Determination of Flash Point and Ignition Point of Petroleum Products - Cleveland Open Cup Method"; the pour point was determined according to GB / T3535 "Determination of Pour Point of Petroleum Products"; and the viscosity index of the lubricating oil compositions was determined according to GB / T2541-1981 "Violent Index Calculation Table of Petroleum Products". The test results are as follows: Figure 2 and Figure 3 As shown.

[0044] Figure 2 and Figure 3 The results showed that the flash point and pour point of the lubricating oil compositions in Examples 1-3 were better than those in Comparative Examples 1-5, and the high-temperature and low-temperature performance was better. The viscosity index of the lubricating oil compositions in Examples 1-3 was higher than that in Comparative Examples 1-5, indicating that the lubricating oil compositions of the present invention have higher resistance to high and low temperatures.

[0045] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the invention is limited to these examples; within the framework of the invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity.

Claims

1. A lubricating oil composition resistant to high and low temperatures and wear, characterized in that, The raw materials for preparation include the following components in parts by weight: 60-90 parts of polyalphaolefin, 20-30 parts of linseed oil, 0.5-1 parts of antioxidant 168, 0.03-0.05 parts of rust inhibitor T705, 2-3 parts of modified organosilicon polymer, and 0.8-1.2 parts of modified SiO2; The preparation method of the modified organosilicon polymer includes the following steps: L1. Eugenol, triethylamine and ethyl acetate were mixed and stirred to dissolve, and phenylphosphodichlorodichloride was dissolved in ethyl acetate and added to the mixture. The mixture was reacted, filtered, washed, dried, filtered again, rotary evaporated, and dried to obtain the intermediate. L2. Take the intermediate obtained in step L1, Karstedt catalyst and toluene, mix them, heat, add 1,1,3,3-tetramethyldisiloxane dropwise, keep warm, add activated carbon powder and stir, filter, and evaporate under reduced pressure. L3. Take the product obtained in step L2, 2,2'-(1,2-ethylenedioxy)diethyl mercaptan, benzoin dimethyl ether and tetrahydrofuran, mix them, irradiate with ultraviolet light, evaporate under reduced pressure, wash and dry to obtain the modified organosilicon polymer. The method for preparing the modified SiO2 includes the following steps: V1. Nano-SiO2 was ultrasonically dispersed in dichloromethane, chloroethyl isocyanate and stannous octoate were added, stirred evenly, reacted, centrifuged, washed, and dried to obtain chloroethyl isocyanate-SiO2. V2. The chloroethyl isocyanate-SiO2 obtained in step V1 was added to acetonitrile and ultrasonically dispersed. N-methylimidazolium was added and stirred until homogeneous. The mixture was reacted, centrifuged, washed, and dried to obtain modified SiO2.

2. The high and low temperature resistant and wear-resistant lubricating oil composition according to claim 1, characterized in that, In step L1, the molar ratio of eugenol, triethylamine, and phenylphosphodichloro is 2:2.4:

1.

3. The high and low temperature resistant and wear-resistant lubricating oil composition according to claim 2, characterized in that, In step L2, the mass ratio of the intermediate to 1,1,3,3-tetramethyldisiloxane is 7:

1.

4. The high and low temperature resistant and wear-resistant lubricating oil composition according to claim 3, characterized in that, In step L3, the ratio of the product obtained in L2, 2,2'-(1,2-ethylenedioxy)diethylthiol, benzoin dimethyl ether, and tetrahydrofuran is 6 g:1 g:0.2 g:10 mL.

5. The high and low temperature resistant and wear-resistant lubricating oil composition according to claim 4, characterized in that, In step V1, the mass ratio of the chloroethyl isocyanate to nano-SiO2 is 1:1.5-2.

6. The high and low temperature resistant and wear-resistant lubricating oil composition according to claim 5, characterized in that, In step V2, the mass ratio of N-methylimidazolium to chloroethyl isocyanate-SiO2 is 1:2-3.

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