Preparation method of efficient dispersing type graphene composite lubricating oil additive

Abstract

The invention relates to the technical field of preparation of a graphene lubricating oil additive through a graphene uniform dispersion technology, and discloses a preparation method of an efficient dispersion type graphene composite lubricating oil additive, which comprises the following steps: a) carrying out surface modification on graphene by utilizing plasma treatment; b) mixing the modified graphene with a surfactant; c) uniformly mixing the graphene dispersion liquid with poly-alpha-olefin (PAO) base oil with specific molecular weight distribution on a nanoscale by adopting a microfluidic technology to form a premix; d) adding a custom-formulated antioxidant, an extreme pressure additive and nanoscale silicon dioxide particles and / or metal oxide into the premix; through plasma treatment and ultrasonic treatment conditions, the compatibility of graphene and base oil is remarkably enhanced, the comprehensive performance of the lubricating oil is improved, meanwhile, the antioxidant, the extreme pressure additive and the nano material are introduced, and the wear resistance, oxidation resistance and extreme pressure performance of the composite additive are remarkably improved.

Description

Technical Field

[0001] The invention relates to the technical field of preparing graphene lubricating oil additives by using graphene uniform dispersion technology, and specifically to a method for preparing a highly efficient dispersed graphene composite lubricating oil additive. Background Art

[0002] In the field of lubricants, traditional additives often fail to meet the needs of modern mechanical equipment for high-performance lubricants under extreme working conditions. With the advancement of science and technology, graphene, as a new type of two-dimensional carbon material, has attracted much attention due to its unique physical and chemical properties. Graphene has a high specific surface area, excellent mechanical properties, good thermal conductivity and electrical conductivity, but in practical applications, how to evenly disperse it in lubricants and how to enhance its compatibility with base oils have always been challenges faced by the industry. Traditional dispersion techniques often lead to the agglomeration of graphene sheets, limiting their application in lubricants.

[0003] In addition, in order to improve the comprehensive performance of lubricants, various additives such as antioxidants and extreme pressure additives are usually added, but the interactions and synergistic effects between these additives have not been fully utilized, especially in the preparation of graphene composite additives. Traditional preparation methods also often ignore the deep mixing and interaction of additive components, resulting in the performance of composite additives failing to achieve the best. Summary of the invention

[0004] The object of the present invention is to provide a method for preparing a highly efficient dispersed graphene composite lubricant additive to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: A method for preparing a highly efficient dispersed graphene composite lubricant additive comprises the following steps: a) Surface modification of graphene using plasma treatment to enhance its lipophilicity and introduce specific functional groups to improve compatibility with base oil; b) mixing the modified graphene with a surfactant under an ultrasonic environment to form a graphene dispersion with high stability and low viscosity; The ultrasonic treatment conditions are as follows: temperature 30°C to 80°C, frequency 30kHz to 80kHz, and treatment time 2 hours to 4 hours; c) using microfluidics technology to uniformly mix the graphene dispersion with a poly-alpha-olefin (PAO) base oil with a specific molecular weight distribution at the nanoscale to form a premix; d) adding a customized antioxidant, an extreme pressure additive, and nano-sized silica particles and / or metal oxides to the premix, and simultaneously performing high-speed shear stirring under the assistance of a magnetic field to form a composite additive, and finally adding a friction modifier to form a lubricating film on the metal surface; The magnetic field induction intensity is 0.1T to 1.0T, the stirring speed is 2000 to 4000 revolutions per minute, the stirring time is 1 hour to 2 hours, and a reverse shear cycle is adopted.

[0006] Preferably, the surfactant comprises at least two different types of surfactants.

[0007] Preferably, the plasma treatment uses an inert gas such as nitrogen or argon as a working gas, and is used to control the chemical modification of the graphene surface by adjusting the gas pressure and the treatment time.

[0008] Preferably, the base oil comprises poly-alpha-olefin (PAO) with a specific molecular weight distribution, a narrow molecular weight distribution and a specific branched structure.

[0009] Preferably, the combination of the antioxidant and the extreme pressure additive can act synergistically to form a stable protective film.

[0010] Preferably, in the ultrasonic treatment conditions: The temperature is preferably 50°C to 70°C; The frequency is preferably 40kHz to 60kHz; The treatment time is preferably about 3 hours.

[0011] Preferably, in the magnetic field assisted stirring condition: The magnetic field induction intensity is preferably about 0.3T to 0.6T; The stirring speed is preferably about 3000 revolutions per minute; The stirring time is preferably about 1.5 hours.

[0012] Preferably, the composite additive further contains nano-scale silicon dioxide particles.

[0013] Preferably, a corrosion inhibitor is added to the composite additive, and the corrosion inhibitor can form a thin and dense protective film on the metal surface.

[0014] Preferably, one or more nano-scale metal oxides are added to the composite additive, and the nano-scale metal oxide is aluminum oxide or zinc oxide.

[0015] The present invention has at least the following beneficial effects: (1) This scheme significantly enhances the compatibility of graphene with base oil through plasma treatment and specific ultrasonic treatment conditions, ensures the uniform dispersion of graphene in lubricating oil, reduces agglomeration, and thus improves the comprehensive performance of lubricating oil. At the same time, antioxidants, extreme pressure additives and nanomaterials are introduced. By controlling the preparation conditions, such as high-speed shear stirring assisted by a magnetic field, the deep mixing and synergistic effect between the additives are promoted, and the anti-wear, antioxidant and extreme pressure properties of the composite additives are significantly improved.

[0016] (2) This solution improves the thermal stability and fluidity of the composite additives in a wide temperature range by selecting PAO base oils with a specific molecular weight distribution and branched structure, so that the lubricant can still maintain a good lubrication effect at extreme temperatures. In addition, due to the high performance of the composite additives, it can effectively reduce friction losses and reduce wear of mechanical parts, thereby extending the service life of mechanical equipment and reducing maintenance costs.

[0017] (3) By adjusting the preparation conditions, such as temperature, frequency and magnetic field strength, this scheme can prepare composite additives suitable for different working conditions, such as high temperature, high frequency or corrosive environment, thus broadening the application range of lubricating oil.

[0018] (4) By adding corrosion inhibitors and nano-scale metal oxides, the composite additive not only has excellent anti-wear and anti-oxidation properties, but also has multiple functions such as anti-corrosion, thermal conductivity and electrical insulation, which improves its applicability in the lubrication field of electronic equipment and high-precision mechanical equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0020] Figure 1 The present invention is a flow chart of the preparation method. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] Example 1 See also Figure 1The present invention provides a technical solution: a method for preparing a highly efficient dispersed graphene composite lubricant additive, comprising the following steps: a) Surface modification of graphene by plasma treatment to enhance its lipophilicity and introduce specific functional groups to improve compatibility with base oil; b) mixing the modified graphene with a surfactant under an ultrasonic environment to form a graphene dispersion with high stability and low viscosity; The ultrasonic treatment conditions are as follows: temperature of 30°C to 80°C, frequency of 30kHz to 80kHz, treatment time of 2 hours to 4 hours, and pulse mode to avoid graphene agglomeration; c) using microfluidics technology to uniformly mix the graphene dispersion with a poly-alpha-olefin (PAO) base oil of a specific molecular weight distribution at the nanoscale to form a premix to ensure a monolayer dispersion of the graphene; d) adding a customized antioxidant, an extreme pressure additive, and nano-sized silica particles and / or a metal oxide to the premix while performing high-speed shear stirring with the assistance of a magnetic field to form a composite additive; The magnetic field induction intensity is 0.1T to 1.0T, the stirring speed is 2000 to 4000 revolutions per minute, the stirring time is 1 hour to 2 hours, and a reverse shear cycle is adopted.

[0023] It should be further explained that: a) using plasma treatment technology to modify the surface of graphene, by adjusting the power of plasma treatment (ranging from 50W to 300W), treatment time (ranging from 5 minutes to 30 minutes) and plasma working gas type (preferably argon or helium) to precisely control the surface functional group density of graphene and enhance its compatibility with base oil and dispersion stability; b) mixing the modified graphene with a specially prepared double-chain nonionic surfactant at a mass ratio of 1:10 to 1:20, and dispersing the mixture under an ultrasonic environment (the frequency is set at 50 kHz, the treatment temperature is controlled at 50°C to 60°C, and the treatment time is 3 hours) to form a highly stable graphene dispersion having a particle size distribution of less than 50 nanometers, so as to ensure the single-layer or multi-layer state of the graphene sheet and improve its dispersion uniformity and long-term stability in the lubricating oil; c) in a dust-free environment, injecting the graphene dispersion into a base oil preheated to 70° C. at a constant flow rate using a precision metering pump, wherein the base oil is preferably a synthetic PAO oil having a specific viscosity index (VI>100) to ensure that the composite additive has excellent fluidity in a wide temperature range; at the same time, applying a high-intensity magnetic field (magnetic field induction intensity of 0.5 T) during this process to promote uniform distribution of graphene sheets in the oil matrix to form a premix; d) Add a customized antioxidant (such as a mixture of phenolic antioxidant Irganox1010 and amine antioxidant Napvis30) and an extreme pressure additive (such as sulfur-phosphorus extreme pressure agent T405) to the premix, and perform high-speed shear stirring (stirring speed of 3000 revolutions per minute, stirring time of 1.5 hours) with the assistance of a magnetic field (magnetic field induction intensity of 0.3T to 0.7T) to ensure deep mixing and interaction of the additive components, and finally obtain a composite additive with excellent anti-wear, antioxidant and extreme pressure properties, which can still maintain a stable dispersion state under extreme working conditions, significantly improve the lubrication effect, reduce friction loss, and extend the service life of mechanical equipment. ), finally add a friction modifier (such as a sulfurized or phosphated compound) to form a lubricating film on the metal surface, thereby reducing friction and wear In some embodiments, the surfactant comprises at least two different types of surfactants, one for increasing the dispersibility of graphene and the other for improving the long-term stability of the additive.

[0024] In some embodiments, the plasma treatment uses an inert gas such as nitrogen or argon as a working gas, and is used to control the chemical modification of the graphene surface by adjusting the gas pressure and the treatment time, thereby minimizing the degree of oxidation and maximizing the retention of its excellent physical properties.

[0025] In some embodiments, the base oil comprises poly-alpha-olefin (PAO) with a specific molecular weight distribution, narrow molecular weight distribution and a specific branched structure to improve the low temperature fluidity and high temperature stability of the composite additive.

[0026] In some embodiments, the combination of the antioxidant and the extreme pressure additive can work synergistically to form a stable protective film, significantly improving the antioxidant capacity and load-carrying capacity of the lubricating oil, especially under extreme conditions.

[0027] In some embodiments, the ultrasonic treatment conditions include: The temperature is preferably 50° C. to 70° C.; this temperature range can provide sufficient heat to help graphene disperse better in the base oil, while also avoiding excessively high temperatures that may cause deterioration of the base oil or additives.

[0028] The frequency is preferably 40 kHz to 60 kHz; this frequency range is commonly used in ultrasonic processing and can effectively produce a cavitation effect to help disperse the graphene sheets without causing energy loss due to excessively high frequencies.

[0029] The treatment time is preferably about 3 hours; this allows sufficient time for the ultrasonic energy to be evenly distributed throughout the mixture, promoting dispersion of the graphene, while avoiding damage to the graphene or degradation of the base oil that may result from prolonged treatment.

[0030] In some embodiments, under magnetic field assisted stirring conditions: The magnetic field induction intensity is preferably about 0.3T to 0.6T; this intensity can effectively generate a rotating magnetic field to help the additives be evenly distributed in the mixture, while avoiding the adverse effects of excessively strong magnetic fields on certain additives (especially electronically sensitive additives).

[0031] The stirring speed is preferably about 3000 revolutions per minute; this speed can provide sufficient shear force to help uniformly mix the ingredients in the mixture, while avoiding increased energy consumption or additional wear on the equipment caused by excessively high speeds.

[0032] The stirring time is preferably about 1.5 hours; this allows sufficient time for all additives to be fully dispersed and mixed with the assistance of the magnetic field to form a uniform composite system.

[0033] In some embodiments, the composite additive further contains nano-sized silica particles to further enhance its anti-wear performance and thermal stability.

[0034] In some embodiments, a corrosion inhibitor is added to the composite additive, and the corrosion inhibitor can form a thin and dense protective film on the metal surface, effectively preventing acid and alkali erosion and electrochemical corrosion, and is particularly suitable for highly corrosive environments, significantly improving the corrosion resistance and service life of the equipment.

[0035] In some embodiments, one or more nano-scale metal oxides are added to the composite additive, and the nano-scale metal oxide is aluminum oxide (Al2O3) or zinc oxide (ZnO) to improve the tribological properties of the additive, reduce corrosion on the metal surface, and enhance its thermal conductivity and electrical insulation. It is particularly suitable for lubrication of electronic equipment and high-precision mechanical equipment that require high thermal conductivity and insulation properties.

[0036] Example 2 The present invention also provides a method for preparing a highly efficient dispersed graphene composite lubricant additive under high temperature and high frequency. Step a: Graphene was treated with argon plasma, the gas pressure was set to standard atmospheric pressure, and the treatment time was 3 hours to ensure that the graphene surface was sufficiently chemically modified to improve its lipophilicity and compatibility with PAO base oil.

[0037] Step b: The ultrasonic treatment conditions were set at a temperature of 70 °C, a frequency of 60 kHz, and a treatment time of 3 h, using two surfactants (anionic and nonionic) mixed in a 1:1 ratio to form a more stable graphene dispersion.

[0038] Step c: The graphene dispersion obtained in step b is mixed with a PAO base oil with a narrow molecular weight distribution by using microfluidic technology to ensure uniform dispersion at the nanoscale.

[0039] Step d: Antioxidants, extreme pressure additives and nano-scale silica particles were added, and the mixture was stirred at a speed of 3000 revolutions per minute for 1.5 hours under a magnetic field induction intensity of 0.6 T to complete the preparation of the composite additive.

[0040] Example 3 The present invention also provides a method for preparing a highly efficient dispersed graphene composite lubricant additive at medium temperature and medium frequency. Step a: The plasma treatment steps in Example 1 were repeated, but using nitrogen as the working gas.

[0041] Step b: The ultrasonic treatment conditions were adjusted to a temperature of 50°C, a frequency of 40 kHz, a treatment time of 3 hours, and two different types of surfactants (zwitterionic and cationic) were used to form a graphene dispersion with high stability.

[0042] Step c: Using microfluidics technology, the graphene dispersion is uniformly mixed with the PAO base oil with a specific branched structure at the nanoscale.

[0043] Step d: High-speed shear stirring is also performed under the assistance of a magnetic field, but the magnetic field induction intensity is adjusted to 0.3 T, the stirring speed is 3000 revolutions per minute, and the stirring time is 1.5 hours. Antioxidants, extreme pressure additives, and nano-scale metal oxides (such as alumina) are added to form the final composite additive.

[0044] Example 4 The present invention also protects a method for preparing a highly efficient dispersed graphene composite lubricating oil additive by introducing a corrosion inhibitor and a nano material. Step a: The plasma treatment was performed using argon gas under the same conditions as in Example 2.

[0045] Step b: The ultrasonic treatment conditions are the same as those in Example 3.

[0046] Step c: The mixing was performed using microfluidic technology, and the conditions were the same as in Example 3.

[0047] Step d: High-speed shear stirring is performed under the assistance of a magnetic field, and the conditions are the same as those in Example 3, but corrosion inhibitors and nano-scale metal oxides (zinc oxide) are added on this basis to further enhance the performance of the composite additive, especially its ability to form a protective film on the metal surface.

[0048] Based on the description of the above four embodiments, the effects of each embodiment are as follows: The effect of embodiment 1: Enhanced compatibility and dispersibility: Through plasma treatment and ultrasonic dispersion technology, the compatibility of graphene with base oil is improved, ensuring the uniform dispersion of graphene in the lubricant and reducing agglomeration.

[0049] Optimizing additive performance: By adding antioxidants, extreme pressure additives and nanomaterials, the anti-wear, anti-oxidation and extreme pressure properties of the composite additives are significantly improved, and their stability under extreme conditions is enhanced.

[0050] Improve mechanical efficiency and life: Due to the high performance of graphene and its composite additives, friction loss and wear can be reduced, thereby extending the service life of mechanical equipment.

[0051] Improved thermal stability and fluidity: By selecting PAO base oil with a specific molecular weight distribution and optimizing processing conditions, the additive package exhibits better thermal stability and fluidity over a wide temperature range.

[0052] Synergistic effect: The synergistic effect between additives forms a more stable protective film, improving the overall performance of the lubricant, especially under extreme operating conditions.

[0053] The effect of embodiment 2: Enhanced surface modification: Ultrasonic treatment at high temperature (70°C) and high frequency (60kHz) helps to more deeply modify the surface properties of graphene, increase its oleophilicity, and improve compatibility with PAO base oils by introducing specific functional groups.

[0054] Highly stable dispersion: The use of two surfactants enables graphene to form a more stable dispersion system in oil, reducing agglomeration and improving lubrication efficiency.

[0055] Enhanced additive performance: The composite additive prepared under high-intensity magnetic field (0.6T) and high-speed stirring (3000rpm) can more effectively disperse various additive components, including nano-scale silica, to form a uniform protective layer, improve lubrication performance and extend mechanical life.

[0056] The effect of embodiment 3: Surface modification under mild conditions: Using nitrogen plasma and ultrasonic treatment at medium temperature (50°C) and medium frequency (40kHz) can avoid damage to the graphene structure that may be caused by high temperature and maintain its good physical properties.

[0057] Diverse Additive Compatibility: The combination of zwitterionic and cationic surfactants helps to form additive packages with broader applicability and suitability for different base oil types.

[0058] Optimized additive formula: adding antioxidants, extreme pressure additives and nano-scale metal oxides (such as alumina), stirring under a relatively low magnetic field (0.3T), can achieve the effect of balancing cost and performance, and is suitable for lubrication of mechanical equipment under normal working conditions.

[0059] The effect of embodiment 4: Comprehensive corrosion protection: The addition of corrosion inhibitors can form a thin and dense protective film on the metal surface, effectively preventing erosion by moisture, oxygen and other corrosive media, and extending the service life of the equipment.

[0060] Enhanced anti-wear performance: The use of nano-scale metal oxides (such as zinc oxide) can provide additional friction interface stability and wear resistance, especially in high temperature and high pressure environments.

[0061] Comprehensive performance improvement: By optimizing the additive formula, the composite additive of this embodiment can provide all-round lubrication protection, including anti-corrosion, anti-wear, anti-oxidation and extreme pressure performance, and is suitable for high-performance equipment under extreme working conditions.

[0062] Comparative Example 1 Provided are a preparation method of a graphene oxide composite lubricant and a composite lubricant, the preparation method comprising the following preparation steps: using lubricant as a surface modifier to prepare a graphene oxide lubricating additive; mixing the graphene oxide lubricating additive with the lubricating oil to prepare a graphene oxide composite lubricant; wherein the addition amount of the graphene oxide lubricating additive is 0.003wt%-0.006wt%. The composite lubricant prepared by the preparation method provided by the present invention has a simple and effective preparation process, uses the lubricating oil itself to perform surface modification on graphene oxide, and uses the lubricating oil as a lubricating additive to prepare the composite lubricant, which can make the lubricating additive better dispersed in the lubricating oil, significantly improve the lubricating performance of the lubricating oil, ensure the normal operation of the machine and reduce the wear of machine parts, and has important practical application value; Comparative Example 2 Provided are a method for preparing and applying a titanium dioxide-graphene oxide lubricating oil nano-additive with self-cleaning ability, which relates to a method for preparing and applying a lubricating oil nano-additive. The purpose of the present invention is to solve the problem that the existing lubricating oil additives do not have a self-cleaning function and are prone to accidents when used improperly. Method: 1. Prepare a titanium dioxide-graphene oxide nanocomposite; 2. Disperse. The titanium dioxide-graphene oxide lubricating oil nano-additive with self-cleaning ability is used as a lubricating oil additive. The titanium dioxide-graphene oxide lubricating oil nano-additive with self-cleaning ability is used as a photothermal conversion material. The titanium dioxide-graphene oxide lubricating oil nano-additive with self-cleaning ability is used as a self-cleaning material. The present invention can obtain a titanium dioxide-graphene oxide lubricating oil nano-additive with self-cleaning ability.

[0063] In summary, the comparison between the examples and the comparative examples not only highlights the key role of plasma treatment, the combined use of surfactants and magnetic field-assisted stirring in the preparation of highly efficient dispersed graphene composite lubricant additives, but also emphasizes the decisive influence of precise control of parameters in each step on the performance of the final product. The examples achieve stable dispersion of graphene in lubricating oil and high performance of composite additives through a carefully designed preparation process, while the comparative examples intuitively demonstrate the indispensability of these steps for improving the performance of composite additives by removing or changing key steps.

[0064] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0065] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for preparing a highly efficient dispersed graphene composite lubricating oil additive, characterized in that: The following steps are involved: a) Surface modification of graphene using plasma treatment to enhance its lipophilicity and introduce specific functional groups to improve compatibility with base oil; b) mixing the modified graphene with a surfactant under an ultrasonic environment to form a graphene dispersion with high stability and low viscosity; The ultrasonic treatment conditions are as follows: temperature 30°C to 80°C, frequency 30kHz to 80kHz, and treatment time 2 hours to 4 hours; c) using microfluidics technology to uniformly mix the graphene dispersion with a poly-alpha-olefin (PAO) base oil with a specific molecular weight distribution at the nanoscale to form a premix; d) adding a customized antioxidant, an extreme pressure additive, and nano-sized silica particles and / or metal oxides to the premix, and simultaneously performing high-speed shear stirring under the assistance of a magnetic field to form a composite additive, and finally adding a friction modifier to form a lubricating film on the metal surface; The magnetic field induction intensity is 0.1T to 1.0T, the stirring speed is 2000 to 4000 revolutions per minute, the stirring time is 1 hour to 2 hours, and a reverse shear cycle is adopted.

2. The method for preparing a highly efficient dispersed graphene composite lubricating oil additive according to claim 1, characterized in that: The surfactant comprises at least two different types of surfactants.

3. The method for preparing a highly efficient dispersed graphene composite lubricating oil additive according to claim 1, characterized in that: The plasma treatment uses an inert gas such as nitrogen or argon as a working gas, and is used to control the chemical modification of the graphene surface by adjusting the gas pressure and the treatment time.

4. The method for preparing a highly efficient dispersed graphene composite lubricating oil additive according to claim 1, characterized in that: The base oil includes poly-alpha-olefin (PAO) of specific molecular weight distribution, which has narrow molecular weight distribution and specific branched structure.

5. The method for preparing a highly efficient dispersed graphene composite lubricating oil additive according to claim 1, characterized in that: The combination of the antioxidant and the extreme pressure additive can work synergistically to form a stable protective film.

6. The method for preparing a highly efficient dispersed graphene composite lubricating oil additive according to claim 1, characterized in that: In the ultrasonic treatment conditions: The temperature is preferably 50°C to 70°C; The frequency is preferably 40kHz to 60kHz; The treatment time is preferably about 3 hours.

7. The method for preparing a highly efficient dispersed graphene composite lubricating oil additive according to claim 1, characterized in that: In the magnetic field assisted stirring condition: The magnetic field induction intensity is preferably about 0.3T to 0.6T; The stirring speed is preferably about 3000 revolutions per minute; The stirring time is preferably about 1.5 hours.

8. The method for preparing a highly efficient dispersed graphene composite lubricating oil additive according to claim 1, characterized in that: The composite additive also contains nano-scale silicon dioxide particles.

9. The method for preparing a highly efficient dispersed graphene composite lubricating oil additive according to claim 1, characterized in that: A corrosion inhibitor is added to the composite additive, and the corrosion inhibitor can form a thin and dense protective film on the metal surface.

10. The method for preparing a highly efficient dispersed graphene composite lubricating oil additive according to claim 9, characterized in that: One or more nano-scale metal oxides are also added to the composite additive, and the nano-scale metal oxide is aluminum oxide or zinc oxide.

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