Lubricating oil having antioxidant and wear resistance properties and method for its preparation

Abstract

The application relates to the technical field of lubricating oil, and particularly discloses a lubricating oil with antioxidant and wear-resistant properties and a preparation method thereof, which comprises the following raw materials in parts by weight: 100-108 parts of functionalized base oil, 10-14 parts of temperature-resistant reinforcing components, 0.6-1 part of a viscosity index improver, 0.4-0.8 parts of an antioxidant, 1.2-1.6 parts of a dispersant and 0.8-1.2 parts of p-toluene sulfonic acid; the functionalized base oil and the temperature-resistant reinforcing components are added in the application, the functionalized base oil contains hydroxyl groups, pyrimidine groups, pyridine groups and -Si-O-Si- bonds, active hydroxyl groups can produce hydrogen bond interaction with the temperature-resistant reinforcing components, the pyrimidine groups and the pyridine groups can form hydrogen bond interaction with graphene oxide in the temperature-resistant reinforcing components, and the -Si-O-Si- bonds can produce entanglement and knotting with flexible structures in the epoxy soybean oil; through the synergistic effect of the structures, the high-temperature stability, corrosion resistance, shear resistance and wear resistance of the lubricating oil are improved.

Description

Technical Field

[0001] This invention relates to the field of lubricating oil technology, and more specifically, to a lubricating oil with antioxidant and wear-resistant properties and its preparation method. Background Technology

[0002] Plant-based lubricants are widely used in various fields such as industry, transportation, and oil drilling due to their excellent lubricity, good viscosity-temperature characteristics, and low volatility.

[0003] However, because vegetable oils contain a large number of unsaturated bonds, they are easily oxidized, resulting in poor thermal and hydrolytic stability. Therefore, improving product quality and upgrading product grade are urgent needs for improving the vegetable oil-based lubricant industry. At the same time, existing lubricants also have problems such as poor corrosion resistance, low shear resistance, and average wear resistance.

[0004] Therefore, providing a lubricating oil with strong high-temperature stability, good wear resistance, excellent corrosion resistance, and superior shear resistance is a key technical problem that needs to be solved. Summary of the Invention

[0005] To address the problems mentioned in the background section, this invention provides a lubricating oil with antioxidant and wear-resistant properties and its preparation method.

[0006] A lubricating oil with antioxidant and wear-resistant properties comprises the following raw materials in parts by weight: 100-108 parts functionalized base oil, 10-14 parts temperature-resistant enhancing component, 0.6-1 part viscosity index improver, 0.4-0.8 parts antioxidant, 1.2-1.6 parts dispersant and 0.8-1.2 parts p-toluenesulfonic acid;

[0007] A method for preparing a lubricating oil with antioxidant and wear-resistant properties includes the following steps:

[0008] Weigh out the raw materials by weight, add the temperature-enhancing component, viscosity index improver, antioxidant, dispersant and p-toluenesulfonic acid to the functionalized base oil, heat to 90-94℃, stir and react for 16-20 minutes, cool to room temperature, and obtain a lubricating oil with antioxidant and wear-resistant properties.

[0009] Furthermore, the viscosity index improver is viscosity index improver T614 or viscosity index improver LHT7016.

[0010] Furthermore, the antioxidant is at least one selected from 2,6-di-tert-butyl-p-cresol, alkyl diphenylamine, and phytic acid.

[0011] Furthermore, the dispersant is Span-80 or Tween-85.

[0012] Furthermore, the functionalized base oil is prepared by the following steps:

[0013] Step A1: Under nitrogen protection, epoxidized soybean oil, 2,6-diaminopyrimidine-4-ol, and triphenylphosphine were added to anhydrous DMF. The mixture was heated to 66-70°C, stirred until homogeneous, heated to reflux, and stirred for 2.6-3 hours. After cooling to room temperature, the mixture was rotary evaporated, washed, and dried to obtain a pyrimidine monomer. The mass ratio of epoxidized soybean oil, 2,6-diaminopyrimidine-4-ol, triphenylphosphine, and anhydrous DMF was 5-6:1:0.02-0.03:50-60. In the above reaction process, triphenylphosphine was used as a catalyst, and 2,6-diaminopyrimidine-4-ol and epoxidized soybean oil underwent a ring-opening reaction to obtain the pyrimidine monomer.

[0014] Step A2: Add the pyrimidine monomer to anhydrous DMF, stir until homogeneous, and add mixture a dropwise, controlling the addition to be completed within 15 minutes. After the addition is complete, raise the temperature to 76-84℃ and stir the reaction for 3-3.6 hours. After the reaction is complete, centrifuge to precipitate, wash, and dry to obtain the mercapto monomer. The mass ratio of the pyrimidine monomer, anhydrous DMF, and mixture a is 3-5:70-80:30-40. Mixture a is composed of N,N-dicyclohexylcarbodiimide, 4-dimethylaminopyridine, 2-mercaptonicotinic acid, and anhydrous DMF in a mass ratio of 3-6:2.4-2.8:2.6-3.4:50-60. In the above reaction process, anhydrous DMF is used as the solvent, 4-dimethylaminopyridine as the catalyst, and N,N-dicyclohexylcarbodiimide as the dehydrating agent. The carboxyl group of 2-mercaptonicotinic acid can undergo amidation reaction with the amino group of the pyrimidine monomer to obtain the mercapto monomer.

[0015] Step A3: Under nitrogen protection, add the mercapto monomer to the vinyl-terminated dimethyl polysiloxane, heat to 60-70℃, add the photoinitiator, stir evenly, and irradiate with ultraviolet light for 10-20 minutes to obtain the functionalized base oil. The mass ratio of mercapto monomer, vinyl-terminated dimethyl polysiloxane and photoinitiator is 0.2-0.3:1-2:0.01-0.02. In the above reaction process, under the catalysis of the photoinitiator, the mercapto monomer and vinyl-terminated dimethyl polysiloxane undergo a free radical polymerization reaction to obtain the functionalized base oil.

[0016] Furthermore, in step A3, the photoinitiator is benzoin dimethyl ether.

[0017] Furthermore, in step A3, the peak wavelength of the ultraviolet irradiation is 365 nm and the intensity is 80 mw / cm². 2 .

[0018] Furthermore, the temperature-resistant reinforcing component is prepared by the following steps:

[0019] Graphene oxide was added to deionized water and ultrasonically dispersed to obtain a graphene oxide dispersion. This dispersion was then added dropwise to mixture b while stirring, with the addition completed within 10 minutes. After the addition was complete, the mixture was heated to 46-50℃ under nitrogen protection and stirred for 20-24 hours. The mixture was then washed, dried, ground, and sieved to obtain a heat-resistant enhanced component. The mass ratio of graphene oxide, deionized water, and mixture b was 0.6-0.8:200:50-60. Mixture b consisted of L-glutamic acid and sodium hydroxide aqueous solution in a mass ratio of 2.6-3:60. During the above reaction, the oxygen-containing functional groups on graphene oxide could undergo a ring-opening reaction with L-glutamic acid under alkaline conditions, resulting in the heat-resistant enhanced component.

[0020] Furthermore, the sodium hydroxide aqueous solution has a mass fraction of 36-40%.

[0021] Compared with existing technologies, the present invention has the following beneficial effects: To improve the high-temperature stability, corrosion resistance, shear resistance, and anti-wear properties of lubricating oil, the present invention addresses this issue from two aspects. First, it incorporates functionalized base oil, which contains active hydroxyl groups, pyrimidinyl groups, pyridinyl groups, and -Si-O-Si- bonds. The presence of active hydroxyl groups allows them to interact with the carboxyl groups in the temperature-resistant enhancement components through hydrogen bonding, thereby improving the shear resistance of the lubricating oil. The pyrimidinyl and pyridinyl groups not only form hydrogen bonds with the graphene oxide in the temperature-resistant enhancement components, improving the high-temperature stability of the lubricating oil, but they can also adsorb onto the metal surface through coordination bonds, forming a dense, monomolecular or multimolecular protective film that effectively isolates moisture, oxygen, and acidic substances, thus improving the corrosion resistance of the lubricating oil. Simultaneously, it reduces direct metal-to-metal contact, improving the wear resistance of lubricating oil. The -Si-O-Si- bonds not only work with rigid graphene oxide to improve the heat resistance of lubricating oil, but also entangle with the flexible structure in epoxidized soybean oil to form an interpenetrating molecular network structure, further improving the shear resistance of lubricating oil. Secondly, a temperature-resistant enhancement component is added. On the one hand, it leverages the stable chemical properties of graphene oxide to improve the corrosion resistance, shear resistance, and wear resistance of lubricating oil. On the other hand, the carboxyl groups contained in the temperature-resistant enhancement component can chemically bond with the hydroxyl groups on the functionalized base oil. Introducing it into the lubricating oil allows it to work synergistically with the functionalized base oil to jointly improve the high-temperature stability, corrosion resistance, shear resistance, and wear resistance of the lubricating oil. Detailed Implementation

[0022] To make the embodiments of the present invention easier to understand, the present invention will be described in detail below with reference to specific embodiments. These embodiments are for illustrative purposes only and are not limited to the application scope of the present invention.

[0023] The present invention will be further described in detail below with reference to the embodiments.

[0024] The specific parameters of the raw materials used in this invention are as follows:

[0025] The epoxidized soybean oil was provided by Changzhou Senlang Chemical Co., Ltd., CAS No. 8013-07-8; the vinyl-terminated dimethyl polysiloxane was provided by Hubei Watson Chemical Technology Co., Ltd., CAS No. 68083-19-2; and the graphene oxide was provided by Advanced Institute (Shenzhen) Technology Co., Ltd., model YB-202, mesh number 600.

[0026] Examples 1-3 and Comparative Examples 1-4 provide lubricating oils with antioxidant and wear-resistant properties and their preparation methods.

[0027] Example 1

[0028] This embodiment provides a lubricating oil with antioxidant and wear-resistant properties, comprising the following raw materials in parts by weight: 100 parts functionalized base oil, 10 parts temperature-resistant enhancement component, 0.6 parts viscosity index improver T614, 0.4 parts 2,6-di-tert-butyl-p-cresol, 1.2 parts Span-80 and 0.8 parts p-toluenesulfonic acid;

[0029] A method for preparing a lubricating oil with antioxidant and wear-resistant properties includes the following steps:

[0030] Weigh out the raw materials by weight, add the heat resistance enhancement component, viscosity index improver T614, 2,6-di-tert-butyl-p-cresol, Span-80 and p-toluenesulfonic acid to the functionalized base oil, heat to 90°C, stir and react for 20 minutes at a speed of 640 rpm, and cool to room temperature to obtain a lubricating oil with antioxidant and wear-resistant properties.

[0031] Functionalized base oils are prepared by the following steps:

[0032] Step A1: Under nitrogen protection, epoxidized soybean oil, 2,6-diaminopyrimidine-4-ol, and triphenylphosphine were added to anhydrous DMF. The mixture was heated to 66°C and stirred at 640 rpm for 30 min until homogeneous. The mixture was then heated to reflux and stirred for 2.6 h while maintaining the stirring speed. After cooling to room temperature, the mixture was rotary evaporated at 80°C until the anhydrous DMF was removed. The mixture was washed three times each with anhydrous ethanol and deionized water, and dried at 65°C to constant weight to obtain the pyrimidine monomer. The mass ratio of epoxidized soybean oil, 2,6-diaminopyrimidine-4-ol, triphenylphosphine, and anhydrous DMF was 5:1:0.02:50.

[0033] Step A2: Add the pyrimidinyl monomer to anhydrous DMF and stir at 600 rpm for 30 min until homogeneous. Add mixture a dropwise, controlling the addition to be completed within 15 min, with a dropping rate of 3 drops / second. After the addition is complete, raise the temperature to 76℃ and stir the reaction for 3.6 h. After the reaction is complete, centrifuge the precipitate and wash it three times each with anhydrous ethanol and deionized water (each time the mass of anhydrous ethanol and deionized water removed is 35% of the mass of mixture a). Dry at 68℃ to constant weight to obtain the thiol monomer. The mass ratio of pyrimidinyl monomer, anhydrous DMF and mixture a is 3:70:30. Mixture a is composed of N,N-dicyclohexylcarbodiimide, 4-dimethylaminopyridine, 2-mercaptonicotinic acid and anhydrous DMF in a mass ratio of 3:2.4:2.6:50.

[0034] Step A3: Under nitrogen protection, add the mercapto monomer to vinyl-terminated dimethyl polysiloxane, heat to 60°C, then add benzoin dimethyl ether, and stir at 650 rpm for 36 minutes until homogeneous. Then place the mixture in a container with a wavelength peak of 365 nm and an intensity of 80 mw / cm². 2 The product was irradiated under ultraviolet light for 20 minutes to obtain a functionalized base oil, wherein the mass ratio of mercapto monomer, vinyl-terminated dimethyl polysiloxane and benzoin dimethyl ether was 0.2:1:0.01.

[0035] The heat-resistant reinforcing component is prepared by the following steps:

[0036] Graphene oxide was added to deionized water and sonicated for 42 minutes at an ultrasonic frequency of 35 kHz and an ultrasonic power of 500 W until homogeneous, resulting in a graphene oxide dispersion. The mixture b was added dropwise while stirring at a speed of 640 rpm, with the addition completed within 10 minutes at a dropping rate of 3 drops / second. Under nitrogen protection, the temperature was raised to 46°C, and the stirring speed was maintained for 24 hours. The mixture was washed three times each with anhydrous ethanol and deionized water (each time the mass of anhydrous ethanol and deionized water removed was 35% of the mass of mixture b). The mixture was dried at 48°C to constant weight, ground, and passed through a 300-mesh sieve to obtain a heat-resistant enhanced component. The mass ratio of graphene oxide, deionized water, and mixture b was 0.6:200:50. Mixture b consisted of L-glutamic acid and a 36% sodium hydroxide aqueous solution in a mass ratio of 2.6:60.

[0037] Example 2

[0038] This embodiment provides a lubricating oil with antioxidant and wear-resistant properties, comprising the following raw materials in parts by weight: 104 parts functionalized base oil, 12 parts temperature-resistant enhancement component, 0.8 parts viscosity index improver LHT7016, 0.6 parts alkyl diphenylamine, 1.4 parts Tween-85 and 1 part p-toluenesulfonic acid;

[0039] A method for preparing a lubricating oil with antioxidant and wear-resistant properties includes the following steps:

[0040] Weigh out the raw materials by weight, add the heat resistance enhancement component, viscosity index improver LHT7016, alkyl diphenylamine, Tween-85 and p-toluenesulfonic acid to the functionalized base oil, heat to 92°C, stir and react at 700 rpm for 18 minutes, cool to room temperature to obtain a lubricating oil with antioxidant and wear-resistant properties.

[0041] Functionalized base oils are prepared by the following steps:

[0042] Step A1: Under nitrogen protection, epoxidized soybean oil, 2,6-diaminopyrimidine-4-ol, and triphenylphosphine were added to anhydrous DMF. The mixture was heated to 68°C and stirred at 660 rpm for 28 min until homogeneous. The mixture was then heated to reflux and stirred for 2.8 h while maintaining the stirring speed. After cooling to room temperature, the mixture was rotary evaporated at 82°C until the anhydrous DMF was removed. The mixture was washed four times each with anhydrous ethanol and deionized water, and dried at 68°C to constant weight to obtain the pyrimidine monomer. The mass ratio of epoxidized soybean oil, 2,6-diaminopyrimidine-4-ol, triphenylphosphine, and anhydrous DMF was 5.5:1:0.025:55.

[0043] Step A2: Add the pyrimidinyl monomer to anhydrous DMF and stir at 640 rpm for 28 min until homogeneous. Add mixture a dropwise, controlling the addition to be completed within 15 min, with a dropping rate of 3 drops / second. After the addition is complete, raise the temperature to 80℃, maintain the stirring speed, and continue stirring for 3.3 h. After the reaction is complete, centrifuge the precipitate and wash it four times each with anhydrous ethanol and deionized water (each time the mass of anhydrous ethanol and deionized water removed is 35% of the mass of mixture b). Dry at 70℃ to constant weight to obtain the thiol monomer. The mass ratio of pyrimidinyl monomer, anhydrous DMF, and mixture a is 4:75:35. Mixture a is composed of N,N-dicyclohexylcarbodiimide, 4-dimethylaminopyridine, 2-mercaptonicotinic acid, and anhydrous DMF in a mass ratio of 4.5:2.6:3:55.

[0044] Step A3: Under nitrogen protection, add the mercapto monomer to the vinyl-terminated dimethyl polysiloxane, heat to 65°C, then add benzoin dimethyl ether, and stir at 670 rpm for 34 minutes until homogeneous. Then place the mixture in a container with a wavelength peak of 365 nm and an intensity of 80 mw / cm². 2 The product was irradiated under ultraviolet light for 15 minutes to obtain a functionalized base oil, wherein the mass ratio of mercapto monomer, vinyl-terminated dimethyl polysiloxane and benzoin dimethyl ether was 0.25:1.5:0.015.

[0045] The heat-resistant reinforcing component is prepared by the following steps:

[0046] Graphene oxide was added to deionized water and sonicated for 40 minutes at an ultrasonic frequency of 40 kHz and an ultrasonic power of 550 W until homogeneous, resulting in a graphene oxide dispersion. While stirring at 660 rpm, mixture b was added dropwise over 10 minutes at a rate of 3 drops / second. After addition, the mixture was heated to 48°C under nitrogen protection, and the stirring was continued for 22 hours while maintaining the stirring speed. The mixture was then washed four times each with anhydrous ethanol and deionized water (each time the mass of anhydrous ethanol and deionized water was 35% of the mass of mixture b). The mixture was dried at 50°C to constant weight, ground, and passed through a 320-mesh sieve to obtain a heat-resistant enhanced component. The mass ratio of graphene oxide, deionized water, and mixture b was 0.7:200:55. Mixture b consisted of L-glutamic acid and a 38% sodium hydroxide aqueous solution in a mass ratio of 2.8:60.

[0047] Example 3

[0048] This embodiment provides a lubricating oil with antioxidant and wear-resistant properties, comprising the following raw materials in parts by weight: 108 parts functionalized base oil, 14 parts temperature-resistant enhancement component, 1 part viscosity index improver T614, 0.8 parts phytic acid, 1.6 parts Span-80 and 1.2 parts p-toluenesulfonic acid;

[0049] A method for preparing a lubricating oil with antioxidant and wear-resistant properties includes the following steps:

[0050] Weigh out the raw materials by weight, add the temperature resistance enhancement component, viscosity index improver T614, phytic acid, Span-80 and p-toluenesulfonic acid to the functionalized base oil, heat to 94℃, stir and react for 16 minutes at a speed of 700 rpm, and cool to room temperature to obtain a lubricating oil with antioxidant and wear-resistant properties.

[0051] Functionalized base oils are prepared by the following steps:

[0052] Step A1: Under nitrogen protection, epoxidized soybean oil, 2,6-diaminopyrimidine-4-ol, and triphenylphosphine were added to anhydrous DMF. The mixture was heated to 70°C and stirred at 680 rpm for 26 minutes until homogeneous. The mixture was then heated to reflux and stirred for 3 hours while maintaining the stirring speed. After cooling to room temperature, the mixture was rotary evaporated at 84°C until the anhydrous DMF was removed. The mixture was washed five times each with anhydrous ethanol and deionized water, and dried at 71°C to constant weight. The mass ratio of epoxidized soybean oil, 2,6-diaminopyrimidine-4-ol, triphenylphosphine, and anhydrous DMF was 6:1:0.03:60.

[0053] Step A2: Add the pyrimidinyl monomer to anhydrous DMF and stir at 680 rpm for 26 min until homogeneous. Add mixture a dropwise, controlling the addition to be completed within 15 min, with a dropping rate of 3 drops / second. After the addition is complete, raise the temperature to 84℃, maintain the stirring speed, and continue stirring for 3 h. After the reaction is complete, centrifuge the precipitate and wash it 5 times each with anhydrous ethanol and deionized water (each time the mass of anhydrous ethanol and deionized water is 35% of the mass of mixture b). Dry at 72℃ to constant weight to obtain the thiol monomer. The mass ratio of pyrimidinyl monomer, anhydrous DMF, and mixture a is 5:80:40. Mixture a is composed of N,N-dicyclohexylcarbodiimide, 4-dimethylaminopyridine, 2-mercaptonicotinic acid, and anhydrous DMF in a mass ratio of 6:2.8:3.4:60.

[0054] Step A3: Under nitrogen protection, add the mercapto monomer to vinyl-terminated dimethyl polysiloxane, heat to 70°C, then add benzoin dimethyl ether, and stir at 690 rpm for 32 minutes until homogeneous. Then place the mixture in a container with a wavelength peak of 365 nm and an intensity of 80 mw / cm². 2 The product was irradiated under ultraviolet light for 10 minutes to obtain a functionalized base oil, wherein the mass ratio of mercapto monomer, vinyl-terminated dimethyl polysiloxane and benzoin dimethyl ether was 0.3:2:0.02.

[0055] The heat-resistant reinforcing component is prepared by the following steps:

[0056] Graphene oxide was added to deionized water and sonicated for 36 minutes at an ultrasonic frequency of 45 kHz and an ultrasonic power of 600 W until homogeneous, resulting in a graphene oxide dispersion. The mixture b was added dropwise while stirring at a speed of 680 rpm, with the addition completed within 10 minutes. Under nitrogen protection, the temperature was raised to 50°C, and the stirring speed was maintained for 20 hours. The mixture was then washed five times each with anhydrous ethanol and deionized water (each time the mass of anhydrous ethanol and deionized water removed was 35% of the mass of mixture b). The mixture was dried at 52°C to constant weight, ground, and passed through a 340-mesh sieve to obtain a heat-resistant enhanced component. The mass ratio of graphene oxide, deionized water, and mixture b was 0.8:200:60. Mixture b consisted of L-glutamic acid and a 40% sodium hydroxide aqueous solution in a mass ratio of 3:60.

[0057] Comparative Example 1

[0058] The difference between this comparative example and Example 1 is that, in the preparation of the functionalized base oil, 2,6-diaminopyrimidine-4-ol was replaced by 2,6-diaminotoluene by mass, while the remaining steps and raw materials were the same as in Example 1.

[0059] Comparative Example 2

[0060] The difference between this comparative example and Example 1 is that, in the preparation of the functionalized base oil, 2-mercaptonicotinic acid was replaced with nicotinic acid by mass, while the remaining steps and raw materials were the same as in Example 1.

[0061] Comparative Example 3

[0062] The difference between this comparative example and Example 1 is that, in the preparation of the functionalized base oil, vinyl-terminated dimethyl polysiloxane was replaced by methyl acrylate in equal mass, while the remaining steps and raw materials were the same as in Example 1.

[0063] Comparative Example 4

[0064] The difference between this comparative example and Example 1 is that, in preparing the temperature-resistant enhanced component, L-glutamic acid was replaced with n-pentylamine by mass, while the remaining steps and raw materials were the same as in Example 1.

[0065] Performance testing

[0066] High-temperature thermal stability test: The thermal stability of the lubricating oils with antioxidant and wear-resistant properties prepared in Examples 1-3 and Comparative Examples 1-4 was tested according to GB / T 265-1988 "Determination of kinematic viscosity and dynamic viscosity of petroleum products".

[0067] Corrosion resistance test: According to the degree of copper strip corrosion: the corrosion resistance of the lubricating oils with antioxidant and wear-resistant properties prepared in Examples 1-3 and Comparative Examples 1-4 were tested according to GB / T 5096-2017 "Petroleum Products Copper Strip Corrosion Test Method". The degree of copper strip corrosion was divided into 1-4 levels, which are slight discoloration, moderate discoloration, deep discoloration and corrosion, respectively. The higher the level, the higher the degree of corrosion.

[0068] Shear resistance test: 1 wt% of the lubricating oils with antioxidant and wear-resistant properties prepared in Examples 1-3 and Comparative Examples 1-4 were tested at room temperature (25°C) for 170 seconds. -1 The apparent viscosity (η1) was measured after shearing at the shear rate for 4 hours using a six-speed rotational viscometer at room temperature (25°C) and 170 s. -1 The apparent viscosity is measured at the shear rate and defined as the apparent viscosity η0 in the initial state. The viscosity retention rate (%) is then calculated.

[0069]

[0070] Anti-wear performance test: The lubricating oils with anti-oxidation and anti-wear properties prepared in Examples 1-3 and Comparative Examples 1-4 were tested according to standard NB / SH / T 0189-2017. The specific parameters were: MRS-10A four-ball friction and wear tester, test conditions: load 392N, temperature 54℃, time 60min, speed 1800rpm. The anti-wear performance of the test samples was judged by the size of the wear scar diameter.

[0071] Table 1 Performance Tests of Lubricating Oils with Antioxidant and Wear-Resistant Properties

[0072] Testing items <![CDATA[Kinematic viscosity (at 100°C), mm 2 / s]]> Copper sheet corrosion (100℃, 3h) / grade Viscosity retention rate (%) Wear scar diameter / mm Example 1 18.67 1a 83 0.415 Example 2 19.56 1a 89 0.402 Example 3 19.15 1a 86 0.421 Comparative Example 1 17.58 1a 79 0.436 Comparative Example 2 16.34 2b 74 0.451 Comparative Example 3 15.17 2c 71 0.483 Comparative Example 4 15.43 1b 76 0.464

[0073] As shown in Table 1, compared with Comparative Examples 1-4, the lubricating oils with antioxidant and wear-resistant properties prepared in Examples 1-3 of the present invention have superior high-temperature stability, corrosion resistance, shear resistance and wear resistance.

[0074] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A lubricating oil with antioxidant and wear-resistant properties, characterized in that, It includes the following raw materials by weight: 100-108 parts functionalized base oil, 10-14 parts temperature-resistant enhancing component, 0.6-1 part viscosity index improver, 0.4-0.8 parts antioxidant, 1.2-1.6 parts dispersant and 0.8-1.2 parts p-toluenesulfonic acid; Weigh out the raw materials by weight, add the heat resistance enhancement component, viscosity index improver, antioxidant, dispersant and p-toluenesulfonic acid to the functionalized base oil, heat to 90-94℃, stir and react for 16-20 minutes, cool to room temperature, and obtain a lubricating oil with antioxidant and wear-resistant properties. The functionalized base oil is prepared by the following steps: Step A1: Under nitrogen protection, epoxidized soybean oil, 2,6-diaminopyrimidine-4-ol and triphenylphosphine were added to anhydrous DMF, heated to 66-70℃, stirred until homogeneous, heated to reflux, and stirred for 2.6-3 hours. The mixture was then cooled to room temperature, rotary evaporated, washed, and dried to obtain the pyrimidine monomer. Step A2: Add the pyrimidinyl monomer to anhydrous DMF, stir until homogeneous, and add mixture a dropwise. After the addition is complete, heat to 76-84℃ and stir for 3-3.6 hours. After the reaction is complete, centrifuge to precipitate, wash, and dry to obtain the mercapto monomer. Mixture a consists of N,N-dicyclohexylcarbodiimide, 4-dimethylaminopyridine, 2-mercaptonicotinic acid, and anhydrous DMF in a mass ratio of 3-6:2.4-2.8:2.6-3.4:50-60. Step A3: Under nitrogen protection, add mercapto monomer to vinyl-terminated dimethyl polysiloxane, heat to 60-70℃, add photoinitiator, stir evenly, and irradiate with ultraviolet light for 10-20 minutes to obtain functionalized base oil. The temperature-resistant enhancement component is prepared by a ring-opening reaction of graphene oxide and L-glutamic acid.

2. The lubricating oil with antioxidant and wear-resistant properties according to claim 1, characterized in that, In step A1, the mass ratio of epoxidized soybean oil, 2,6-diaminopyrimidine-4-ol, triphenylphosphine, and anhydrous DMF is 5-6:1:0.02-0.03:50-60.

3. The lubricating oil with antioxidant and wear-resistant properties according to claim 1, characterized in that, In step A2, the mass ratio of pyrimidinyl monomer, anhydrous DMF, and mixture a is 3-5:70-80:30-40.

4. The lubricating oil with antioxidant and wear-resistant properties according to claim 1, characterized in that, In step A3, the mass ratio of mercapto monomer, vinyl-terminated dimethyl polysiloxane, and photoinitiator is 0.2-0.3:1-2:0.01-0.

02.

5. The lubricating oil with antioxidant and wear-resistant properties according to claim 1, characterized in that, The heat-resistant reinforcing component is prepared by the following steps: Graphene oxide was added to deionized water and ultrasonically dispersed to obtain a graphene oxide dispersion. Mixture b was added dropwise while stirring. After the addition was complete, the mixture was heated to 46-50℃ under nitrogen protection and stirred for 20-24 hours. The mixture was then washed, dried, ground, and sieved to obtain the heat-resistant enhanced component.

6. The lubricating oil with antioxidant and wear-resistant properties according to claim 5, characterized in that, The mass ratio of graphene oxide, deionized water, and mixture b is 0.6-0.8:200:50-60, and mixture b is composed of L-glutamic acid and sodium hydroxide aqueous solution in a mass ratio of 2.6-3:60.

Images