CN111961515B - Realization of Al 2 O 3 Method for long-time dispersion stabilization of nano particles in lubricating oil - Google Patents
Realization of Al 2 O 3 Method for long-time dispersion stabilization of nano particles in lubricating oil Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M125/00—Lubricating compositions characterised by the additive being an inorganic material
- C10M125/10—Metal oxides, hydroxides, carbonates or bicarbonates
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M177/00—Special methods of preparation of lubricating compositions; Chemical modification by after-treatment of components or of the whole of a lubricating composition, not covered by other classes
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
- C10M2201/06—Metal compounds
- C10M2201/062—Oxides; Hydroxides; Carbonates or bicarbonates
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
- C10M2201/14—Inorganic compounds or elements as ingredients in lubricant compositions inorganic compounds surface treated with organic compounds
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Abstract
The present application provides a method for realizing Al 2 O 3 A method for stabilizing dispersion of nanoparticles in a lubricating oil for an extended period of time, comprising: s1, adding oleic acid into lubricating oil, and stirring the oleic acid by a dispersion machine; s2, mixing Al 2 O 3 Adding the nanoparticles into a mixed oil solution composed of oleic acid and lubricating oil, and carrying out ultrasonic treatment on the mixed oil solution by using first ultrasonic equipment; s3, stirring the mixed oil solution by magnetic stirring; s4, fully performing ultrasonic treatment on the mixed oil solution in the step S3 by using second ultrasonic equipment, wherein a constant-temperature water bath is adopted in the ultrasonic treatment process to control the temperature range of the mixed oil solution to be 40-60 ℃, and Al is enabled to be contained 2 O 3 Modifying the surface of the nano particles, and uniformly dispersing the nano particles into the mixed oil solution; s5, after the ultrasonic treatment is finished and the mixed oil solution is stabilized for 30-300min, the mixed oil solution is subjected to ultrasonic treatment for 1-5min by the first ultrasonic equipment again to obtain the dispersed Al 2 O 3 Nano oil solution. The method is simple to operate, and can obtain Al with good dispersion and long-term stability 2 O 3 Nano oil solution.
Description
Technical Field
The application relates to the field of lubricating oil, in particular to a method for realizing Al 2 O 3 A method for stabilizing the dispersion of nanoparticles in a lubricating oil over a long period of time.
Background
Various oil solutions containing nanoparticles have been shown to have significant effects in reducing friction, increasing wear resistance and increasing thermal conductivity, such as containing Cu, CuO, Al 2 O 3 、TiO 2 、BN、 MoS 2 And lubricating oil of one or two nano-particles of the carbon material can obviously improve the antifriction and wear resistance of the lubricating oil. The dispersion stability of the nanoparticles in the oil base is maintained for a long period of timeThere remains a need for improvement.
Al 2 O 3 Nanoparticles, a typical inorganic nanoparticle, have gained wide attention and applications due to their simple preparation and low cost. Nishant Mohan, SAE Technical Paper series (2014), entitled "Tribocial Properties of automatic lubricating SAE 20W-40 continuous Nano-Al 2 O 3 The findings of the particles show that Al is contained in the oil-rich and lubrication-deficient cases compared to the base oil 2 O 3 The friction and the abrasion of the nano-particle lubricating oil are reduced. A publication entitled "Trilogical Properties of Al" by Luoting et Al in Ceramics International 2014, 40 7143- 2 O 3 Conclusion of the study of Nanoparticles as Lubricating Oil Additives "confirmed that Al is contained 2 O 3 After the four-ball wear test is completed under lubricating oil, the friction coefficient and the scar diameter are both effectively improved. Ali et Al, Journal of Tribology (2018, 140, TRIB-17-1329) published a study entitled "Friction and Wear Reduction Mechanisms of the lubricating Contact Using Nanolubricant Underder differential Loads and specifications" that showed Al content compared to lubricating oil without nanoparticles 2 O 3 The nano particle lubricating oil reduces the friction coefficient of the piston ring by 39-53 percent and reduces the wear rate by 25-33 percent.
In connection with the improvement of the thermal conductivity, Sezer et Al in Powder Technology (2019, 344, 404-431) published a research result entitled "A Comprehensive Review on Synthesis, Stablity, thermal Properties, and Characterisation of Nanofluids" which was compared to find Al containing particles in the size range of 5-80nm 2 O 3 The thermal conductivity of the nanoparticle lubricating oil fluid is improved by 0.3% to 38%. Lotfizadeh Dehkordi et Al in his work "Investigation of Viscosity and Thermal Conductivity of aluminum Nanofluids with Addition of SDBS" Heat and Mass Transfer (2013, 49, 1109-1115) found Al at a concentration of 0.01-0.75 vol% 2 O 3 Increase in thermal conductivity of nanofluid of about 0-4 percent. The above studies indicate that Al 2 O 3 As a lubricating oil additive, the anti-wear and anti-friction performance and the heat conduction performance of lubricating oil can be effectively improved, but nano-particle agglomeration and sedimentation are shown along with the passage of time, and the dispersion stability is difficult to keep for a long time, so that the application in industry is limited. How to realize Al 2 O 3 The problem that the nano particles can keep stable dispersion in oil for a long time is urgently needed to be solved at present.
The method for improving the dispersion stability of the nanofluid mainly comprises a physical method and a chemical method. Physical methods include mechanical stirring, ultrasonic dispersion, and the like; the chemical method mainly comprises the steps of adding a dispersing agent, modifying the surface of nanoparticles and the like. Therefore, it is difficult to increase Al 2 O 3 The dispersion stability of the nano particles in the oil solution is that effective combination of physical and chemical methods is not fully utilized, the preparation process is not sufficient, so that the agglomeration of the particles is not completely removed, and the decomposed partial particles do not form steric hindrance to overcome van der Waals force to cause settlement.
Therefore, the prepared nano oil solution with good dispersibility and long-term stability has important significance for improving wear resistance, reducing friction, improving heat transfer efficiency, saving energy and reducing emission.
Disclosure of Invention
It is an object of the present invention to provide a method for producing Al 2 O 3 A method for dispersing and stabilizing nano particles in lubricating oil for a long time aims to solve the problem that the existing nano oil solution is easy to agglomerate and settle.
The technical scheme of the application is as follows:
realization of Al 2 O 3 A method for stabilizing the dispersion of nanoparticles in a lubricating oil over an extended period of time, comprising the steps of:
s1, adding oleic acid into lubricating oil, and stirring the oleic acid at room temperature by a high-speed homogeneous disperser to uniformly disperse the oleic acid in the lubricating oil;
s2, mixing Al 2 O 3 Adding nanoparticles into a mixed oil solution composed of the oleic acid and the lubricating oil, and performing ultrasonication on the mixed oil solution by using first ultrasonic equipmentMaking sound to disperse the agglomerated particles formed in the mixed oil solution;
s3, sufficiently stirring the mixed oil solution in the step S2 through magnetic stirring, so that the oleic acid and the Al are mixed 2 O 3 The nanoparticles remain in contact;
s4, fully performing ultrasonic treatment on the mixed oil solution in the step S3 through a second ultrasonic device, and controlling the temperature range of the mixed oil solution to be 40-60 ℃ by adopting a constant-temperature water bath in the ultrasonic treatment process, so that the oleic acid and the Al are mixed 2 O 3 Reacting the surface of the nano-particles and making the Al 2 O 3 Modifying the surface of the nano particles, and uniformly dispersing the nano particles into the mixed oil solution;
s5, after the ultrasonic treatment is finished, after the mixed oil solution is stabilized for 30-300min, the mixed oil solution is subjected to ultrasonic treatment again for 1-5min by the first ultrasonic equipment to prepare the dispersed Al 2 O 3 Nano oil solution.
As one solution of the present application, in step S1, the lubricating oil includes a base oil, a mineral oil, a synthetic oil, or a mixture of a mineral oil and a synthetic oil.
As an embodiment of the present invention, in step S1, the oleic acid is the Al 2 O 3 The surface modifier in the nano oil solution, wherein the content of the oleic acid accounts for the Al 2 O 3 0.4-6 wt% of the total mass of the nano oil solution.
As a technical scheme of the application, in step S1, the working rotating speed of the dispersion machine is 5000-10000r/min, and the stirring dispersion time is 2-10 min.
As an embodiment of the present application, in step S2, the Al is 2 O 3 The nanoparticles are spherical, rod-shaped or needle-shaped, the average particle diameter is 5-100nm, and the Al is 2 O 3 The content of the nano particles accounts for 0.01 to 0.6 weight percent of the total weight of the lubricating oil.
As a technical solution of the present application, in step S2, the first ultrasonic device is an ultrasonic probe device, the frequency is 20 to 45Hz, the ultrasonic output power is 45 to 180W, and the ultrasonic time is 1 to 3 min.
As a technical scheme of the application, in step S3, the frequency of magnetic stirring is 50Hz, the set temperature in the stirring process is 30-60 ℃, and the stirring time is 30-360 min.
As one technical scheme of the application, in step S4, the second ultrasonic device is composed of an ultrasonic probe device and an ultrasonic bath device, the frequency is 20-45Hz, the ultrasonic output power is 45-180W, and the ultrasonic time is 30-540 min.
The beneficial effect of this application:
realization of Al of the present application 2 O 3 In the method for long-time dispersion and stabilization of the nano-particles in the lubricating oil, oleic acid is mainly used as a nano-particle surface modifier, agglomerated particles are broken by a physicochemical combination method and efficient combination of magnetic stirring and an ultrasonic mode, the ultrasonic frequency and the ultrasonic temperature are optimized, the optimal matching result of ultrasonic power and ultrasonic duration is used, and the preparation process flow is further optimized, so that Al which is well dispersed and can be stable for a long time is obtained 2 O 3 Nano oil solution. The method in the application solves the problem of Al 2 O 3 The technical problems of poor dispersion and poor stability of the nano material in the oil solution are solved, and Al which can be stably dispersed for a long time is obtained 2 O 3 Nano oil solution. The above aims are achieved by selecting the optimal preparation temperature and the appropriate concentration of the oleic acid surface modifier, optimizing the matching between the ultrasonic time and the ultrasonic power and optimizing the preparation process flow. Since oleic acid contains a carboxyl group on one side, Al 2 O 3 The oxides contain hydroxyl groups, so that the oxides can perform chemical reaction, reaction products are connected together in an ionic bond mode, and a monomolecular coating layer is formed on the surface of the nano particles to form a microcell form and form steric hindrance, so that the contact of the nano particles can be effectively avoided, the influence of Van der Waals force among the nano particles is reduced, the agglomeration of the particles is prevented, and a large amount of settlement is avoided; the alkyl chain on the other side of the oleic acid molecule is easy to dissolve in an oily solution, so that the oleic acid modified nano particles have lipophilicity and can be well dissolved in lubricating oil. Next, this applicationThe preparation process is simple, the cost is low, and the manufacturing cost can be effectively reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some examples of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also derive other related drawings based on these drawings without inventive effort.
FIG. 1 shows Al provided in examples of the present application 2 O 3 Fourier infrared spectroscopy of nanoparticles surface-modified with oleic acid;
FIG. 2 shows Al provided in examples of the present application 2 O 3 A graph of absorbance of the nano-oil solution as a function of time;
FIG. 3a shows Al provided in the examples of the present application 2 O 3 TEM images of the nano oil solution after preparation completion day 90;
FIG. 3b shows Al provided in the examples of the present application 2 O 3 TEM images of the nano oil solution after preparation completion on day 140.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
Example (b):
referring to fig. 1 and fig. 2 to 3, the present application provides a method for implementing Al 2 O 3 A method for stabilizing the dispersion of nanoparticles in a lubricating oil over an extended period of time, comprising the steps of:
s1, adding a proper amount of oleic acid into the lubricating oil, and uniformly stirring and dispersing the oleic acid into the lubricating oil at room temperature by using a high-speed homogeneous disperser;
s2, adding proper Al 2 O 3 Adding the nano particles into the mixed oil solution, and performing ultrasonic treatment by using first ultrasonic equipment to disperse agglomerated particles in the mixed oil solution;
s3, fully stirring the mixed oil solution by magnetic stirring to ensure that the oleic acid and the Al are mixed 2 O 3 The nano particles are kept in full contact, so that modification of particle surface modification is facilitated; wherein the magnetic stirring frequency is 50Hz, the set temperature in the stirring process is kept at 30-60 ℃, and the stirring time is 30-360 min;
s4, fully performing ultrasound on the mixed oil solution by adopting second ultrasonic equipment, and controlling the temperature of the oil solution to be between 40 and 60 ℃ by adopting constant-temperature water bath in the ultrasound process so that the oleic acid and Al are mixed 2 O 3 The surface of the nano-particles is fully reacted, so that Al is generated 2 O 3 Fully modifying the surface of the nano particles, and uniformly dispersing the nano particles into the mixed oil solution; wherein, the second ultrasonic equipment can adopt equipment formed by combining ultrasonic probe equipment and ultrasonic bath equipment, the frequency of the second ultrasonic equipment is 20-45Hz, the ultrasonic output power is 45-180W, and the ultrasonic time is 30-540 min;
s5, after the ultrasonic treatment is finished and the mixed oil solution is stabilized for 30-300min, the mixed oil solution is subjected to ultrasonic treatment for 1-5min by an ultrasonic probe device again, so that the well-dispersed milky Al is prepared 2 O 3 Nano oil solution.
In this embodiment, in step S1, the lubricant oil includes base oil, mineral oil, synthetic oil, or a mixture of mineral oil and synthetic oil; oleic acid (C) 18 H 34 O 2 ) Is the surface modifier in the nano oil solution, and the content of the surface modifierAccounting for 0.4-6 wt% of the total mixed oil solution; the working speed of the high-speed homogenizing dispersion machine is 5000 plus 10000r/min, and the stirring dispersion time is 2-10 min.
In this embodiment, Al is used in step S2 2 O 3 The nanoparticles are spherical, rod-shaped or needle-shaped, have an average particle diameter of 5-100nm, and are made of Al 2 O 3 The content of the nano particles accounts for 0.01 to 0.6 weight percent of the total weight of the lubricating oil; meanwhile, the first ultrasonic equipment can adopt ultrasonic probe equipment, the frequency of the ultrasonic probe equipment is 20-45Hz, the ultrasonic output power is 45-180W, and the ultrasonic time is 1-3 min.
The preparation of Al is illustrated below by way of practical example in accordance with the above-described preparation scheme 2 O 3 Nano oil solution:
(1) adding 1.6g of oleic acid into 38.38g of base oil poly-alpha-olefin (PAO6), and continuously stirring for 10min by using a high-speed homogenizing dispersion machine at the rotating speed of 10000 r/min;
(2) 0.02g of spherical Al 2 O 3 Adding the nanoparticles into the oil solution, and performing ultrasonic treatment for 3min by using an ultrasonic probe device; wherein the ultrasonic output power is 120W, and the ultrasonic frequency is 20 Hz;
(3) stirring the oil solution with magnetic stirring at 1000r/min for 300min, and maintaining the temperature of the oil solution at about 30 deg.C to make oleic acid and Al 2 O 3 The surfaces of the nano particles are fully contacted and reacted;
(4) after magnetic stirring, the oil solution is placed in a constant temperature water bath, the temperature is controlled to be about 60 ℃, and then ultrasonic probe equipment is adopted for uninterrupted ultrasonic treatment for 120min to enable Al to be in contact with the oil solution 2 O 3 The nano particles are de-agglomerated; wherein the ultrasonic output power is 120W, and the ultrasonic frequency is 25 Hz;
(5) continuing to perform ultrasonic treatment on the oil solution for 360min by adopting an ultrasonic bath, and further breaking agglomeration; wherein the ultrasonic temperature is controlled to be about 60 ℃, the ultrasonic output power is 100W, and the ultrasonic frequency is 37 Hz;
(6) after the ultrasonic treatment is finished, after the oil solution is stabilized for 240min, the probe is adopted again for ultrasonic treatment for 4min, so that 0.05 wt% of well-dispersed milky Al is prepared 2 O 3 Nano meterAn oil solution.
It should be noted that Al is shown in FIG. 1 by the Ft-IR test spectrum 2 O 3 The surface of the nanoparticles was fully modified with oleic acid.
After the preparation is finished, the dispersion condition of the nanoparticles in the oil solution is represented by periodically adopting a UV ultraviolet spectrum and a TEM electron microscope, and the change of the extinction coefficient from the time when the preparation is finished to the time when the preparation is carried out for 170 days is represented in a figure 2; FIG. 3a is a TEM image of nanoparticles in oil solution prepared on 90 th day, and FIG. 3b is a TEM image of nanoparticles in oil solution prepared on 140 th day, comparing the two images to find part of Al in oil solution on 140 th day 2 O 3 The nanoparticles begin to agglomerate. Further, Al according to day 90 and day 140 after preparation 2 O 3 The photo of the nano oil solution shows that although the bottom of the test tube is partially settled, Al in the oil solution 2 O 3 The nano particles still keep better dispersion stability.
In summary, the present application realizes Al 2 O 3 In the method for long-time dispersion and stabilization of the nano-particles in the lubricating oil, oleic acid is mainly used as a nano-particle surface modifier, agglomerated particles are broken by a physicochemical combination method and efficient combination of magnetic stirring and an ultrasonic mode, the ultrasonic frequency and the ultrasonic temperature are optimized, the optimal matching result of ultrasonic power and ultrasonic duration is used, and the preparation process flow is further optimized, so that Al which is well dispersed and can be stable for a long time is obtained 2 O 3 Nano oil solution. The method in the application solves the problem of Al 2 O 3 The technical problems of poor dispersion and poor stability of the nano material in the oil solution are solved, and Al which can be stably dispersed for a long time is obtained 2 O 3 Nano oil solution. The above aims are achieved by selecting the optimal preparation temperature and the appropriate concentration of the oleic acid surface modifier, optimizing the matching between the ultrasonic time and the ultrasonic power and optimizing the preparation process flow. Magnetic stirring and ultrasound are effective methods for breaking nanoparticle agglomeration, but the duration of magnetic stirring and the sequence of ultrasound combination, ultrasound mode selection, ultrasound duration, ultrasound power, and the likeThe optimal matching among the above factors and the preparation process flow are important factors influencing the dispersion quality of the nano particles in the oil solution.
For Al 2 O 3 The nano-particles and oleic acid are ideal surface modifiers and are important guarantees for achieving stability, and the dosage of the nano-particles is matched with the concentration of the nano-particles. Since oleic acid contains a carboxyl group on one side, Al 2 O 3 The nano particles contain hydroxyl groups, so that the hydroxyl groups can perform chemical reaction, reaction products are connected together in an ionic bond mode, a monomolecular coating layer is formed on the surface of the nano particles, a microcell form is formed, and steric hindrance is formed, so that the contact of the nano particles can be effectively avoided, the influence of Van der Waals force among the nano particles is reduced, the agglomeration of the particles is prevented, and a large amount of settlement is avoided; the alkyl chain on the other side of the oleic acid molecule is easy to dissolve in an oily solution, so that the oleic acid modified nano particles have lipophilicity and can be well dissolved in lubricating oil. Secondly, the preparation process is simple, the cost is low, and the manufacturing cost can be effectively reduced.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (6)
1. Realization of Al 2 O 3 A method for stabilizing the dispersion of nanoparticles in a lubricating oil over an extended period of time, comprising the steps of:
s1, adding oleic acid into lubricating oil, and stirring the oleic acid at room temperature by a high-speed homogeneous disperser to uniformly disperse the oleic acid in the lubricating oil;
s2, mixing Al 2 O 3 Adding nanoparticles into a mixed oil solution composed of the oleic acid and the lubricating oil, and performing ultrasonic treatment on the mixed oil solution by using first ultrasonic equipment to disperse agglomerated particles formed in the mixed oil solution; in step S2The first ultrasonic equipment is ultrasonic probe equipment, the frequency is 20-45Hz, the ultrasonic output power is 45-180W, and the ultrasonic time is 1-3 min;
s3, sufficiently stirring the mixed oil solution in the step S2 through magnetic stirring, so that the oleic acid and the Al are mixed 2 O 3 The nanoparticles remain in contact; in step S3, the frequency of magnetic stirring is 50Hz, the set temperature in the stirring process is 30-60 ℃, and the stirring time is 30-360 min;
s4, performing ultrasound on the mixed oil solution in the step S3 through a second ultrasonic device, wherein a constant-temperature water bath is adopted in the ultrasound process to control the temperature range of the mixed oil solution to be 40-60 ℃, so that the oleic acid and the Al are mixed 2 O 3 Reacting the surface of the nano-particles and making the Al 2 O 3 Modifying the surface of the nano particles, and uniformly dispersing the nano particles into the mixed oil solution;
s5, after the ultrasonic treatment is finished, after the mixed oil solution is stabilized for 30-300min, the mixed oil solution is subjected to ultrasonic treatment again for 1-5min by the first ultrasonic equipment to prepare the dispersed Al 2 O 3 Nano oil solution.
2. Realization Al according to claim 1 2 O 3 A method for stabilizing dispersion of nanoparticles in a lubricating oil for a long period of time, characterized in that, in step S1, the lubricating oil comprises a base oil, a mineral oil, a synthetic oil or a mixture of a mineral oil and a synthetic oil.
3. Realization Al according to claim 1 2 O 3 A method for stabilizing dispersion of nanoparticles in a lubricating oil for a long period of time, characterized in that, in step S1, the oleic acid is the Al 2 O 3 The surface modifier in the nano oil solution accounts for the content of the oleic acid in the Al 2 O 3 0.4-6 wt% of the total mass of the nano oil solution.
4. Realization Al according to claim 1 2 O 3 Nanoparticles in lubricating oilsThe method for stabilizing the medium-long time dispersion is characterized in that in step S1, the working rotating speed of the dispersion machine is 5000-10000r/min, and the stirring dispersion time is 2-10 min.
5. Realization Al according to claim 1 2 O 3 A method for stabilizing dispersion of nanoparticles in a lubricating oil for a long period of time, characterized in that, in step S2, the Al 2 O 3 The nanoparticles are spherical, rod-shaped or needle-shaped, the average particle diameter is 5-100nm, and the Al is 2 O 3 The content of the nano particles accounts for 0.01 to 0.6 weight percent of the total weight of the lubricating oil.
6. Realization Al according to claim 1 2 O 3 The method for stabilizing the long-time dispersion of the nanoparticles in the lubricating oil is characterized in that in step S4, the second ultrasonic device is composed of an ultrasonic probe device and an ultrasonic bath device, the frequency is 20-45Hz, the ultrasonic output power is 45-180W, and the ultrasonic time is 30-540 min.
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