CN108102762B - Functionalized graphene-attapulgite composite nanomaterial, and preparation method and application thereof - Google Patents
Functionalized graphene-attapulgite composite nanomaterial, and preparation method and application thereof Download PDFInfo
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- CN108102762B CN108102762B CN201711422889.2A CN201711422889A CN108102762B CN 108102762 B CN108102762 B CN 108102762B CN 201711422889 A CN201711422889 A CN 201711422889A CN 108102762 B CN108102762 B CN 108102762B
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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
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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
- C10M125/02—Carbon; Graphite
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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
- C10M125/26—Compounds containing silicon or boron, e.g. silica, sand
- C10M125/30—Clay
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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
- C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
- C10M2201/04—Elements
- C10M2201/041—Carbon; Graphite; Carbon black
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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
- C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
- C10M2201/10—Compounds containing silicon
- C10M2201/102—Silicates
- C10M2201/103—Clays; Mica; Zeolites
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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
- 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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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/06—Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
Abstract
The invention discloses a functionalized graphene-attapulgite nano composite material, a preparation method and application thereof. The method comprises the following steps: modifying and treating graphene oxide by using a silane coupling agent to obtain functionalized graphene oxide; mixing the functionalized graphene oxide with the attapulgite nano particles, and heating for reaction to obtain a functionalized graphene-attapulgite nano composite material; the composite material is used as a lubricating oil additive to be mixed with lubricating oil according to a certain proportion for friction and wear experiments, the friction coefficient can be reduced by a very small addition amount, the effects of friction reduction and wear resistance are achieved, and meanwhile, the composite material also has an intelligent repairing effect. The invention has excellent long-term stability and dispersibility in lubricating oil, simple process, high cost performance and easily obtained raw materials; the lubricating oil additive prepared by the invention has good antifriction and antiwear lubricating performance and repairing function, and meanwhile, the high thermal conductivity of graphene can also generate beneficial influence on the lubricating effect.
Description
Technical Field
The invention relates to a functionalized graphene-attapulgite nano composite material, a preparation method and application thereof as a lubricating oil additive, belonging to the technical field of lubricating oil.
Background
Severe wear of friction components often results in major accidents, and the occurrence of wear accidents generally starts with early mild surface micro-damage and progresses to severe surface damage leading to eventual failure of the device. With the development of the nano powder preparation technology and the surface modification technology, researchers have adopted physical or chemical methods to prepare different kinds of nano self-repairing materials, mainly comprising nano elemental powder, hydroxides, oxides, chalcogen compounds, borates, silicates, high molecular compounds and the like.
The graphene is formed by passing carbon atoms through sp2A novel carbon material in a hexagonal honeycomb two-dimensional network structure, which is formed by hybridization, has excellent electric conduction, heat conduction and mechanical properties and is considered to be a targetThe front material boundary is the hardest material. Due to the excellent mechanical property of the graphene and the shearing force between the micro-sheets, the graphene has a lower friction coefficient than graphite and excellent antifriction lubricity. Meanwhile, the surface of the graphene oxide is rich in oxygen-containing functional groups, so that the shearing force between the sheets is larger, and the possibility of introducing new substances to obtain new materials with more excellent performance is provided.
Attapulgite clay is a clay mineral containing water magnesium aluminum silicate, and the crystal is mostly needle-shaped fiber, the diameter of the single crystal is mostly 10-100 nm, the length is 0.1-1 μm, and the attapulgite clay is a natural one-dimensional nano material. The literature reports that attapulgite nano powder can be directly used as a lubricating oil additive (Nanfeng, Xiyi, high flying, Xushun, Heilong, Wuyi male, the tribological performance of the attapulgite powder used as the lubricating oil additive, silicate academic report, 2013,41(06): 836-841.) and the condition for forming a self-repairing layer on the worn surface of metal is not severe. However, inorganic nano powder is easy to agglomerate, is very easy to settle in a medium, and is not ideal particularly in long-term stability.
Disclosure of Invention
The invention aims to provide a functionalized graphene-attapulgite nano composite material, a preparation method and application thereof; the composite material can reduce the friction coefficient of lubricating oil on a mechanical contact surface and improve the lubricating performance of the lubricating oil; and a self-repairing film is formed on the friction surface through the friction mechanical and/or chemical reaction in the friction and wear process, so that the intelligent repairing effect is achieved, and the service life of the machine is further prolonged.
The technical solution for realizing the purpose of the invention is as follows:
a functionalized graphene-attapulgite nano composite material is prepared by modifying graphene oxide by adopting an aminosilane coupling agent to prepare functionalized graphene oxide, bonding attapulgite by a chemical method, and heating and reducing.
Wherein the aminosilane coupling agent is any one of A-1100, A-1110, A-1120 and KBM-602.
Further, the mass ratio of the attapulgite to the graphene oxide is 0.5-8: 1.
The technical solution for realizing the purpose of the invention is as follows: the functionalized graphene-attapulgite nano composite material is prepared by the following steps:
the first step is as follows: preparing a dispersion liquid of graphene oxide by adopting graphene oxide prepared by an improved Hummers method as a raw material, adding an aminosilane coupling agent, stirring at room temperature for 0.5-2 h, heating at 60-95 ℃ for reaction for 1-3 h, cooling to room temperature, performing centrifugal separation, and cleaning to obtain functionalized graphene oxide;
the second step is that: weighing a certain amount of attapulgite powder, dispersing the attapulgite powder in the functionalized graphene oxide dispersion liquid, stirring for 30-90 min, heating and reacting at 100-180 ℃ for 0.5-2 h, standing and cooling; and (4) performing centrifugal separation and cleaning to obtain the functionalized graphene-attapulgite nano composite material.
Furthermore, in the first step, the adding amount of the silane coupling agent is 25-200 mL, and the silane coupling agent corresponds to each gram of graphene oxide; the dispersing agent in the dispersion liquid of the graphene oxide is water or ethanol; the heating mode can be water bath reflux, hydrothermal or solvent heat.
Further, in the second step, the dispersing agent in the functionalized graphene oxide dispersion liquid is water or ethanol; the heating mode is hydrothermal or solvent heat.
The functionalized graphene-attapulgite nano composite material is applied as a lubricating oil additive, and the additive accounts for 0.01-0.5% of the lubricating oil by mass. The lubricating oil can be any brand of lubricating oil, such as Kunlun Scorpio F5000, SF15W-40 type lubricating oil and great wall SJ10W-40 lubricating oil; it may also be a base oil like a mineral base oil or a synthetic base oil.
Compared with the prior art, the invention has the following advantages: (1) the graphene and the attapulgite nano particles are assembled together by chemical bonding of a coupling agent, so that the obtained material components are uniformly dispersed and stable, and have the excellent performances of the graphene, such as antifriction, wear resistance, high stability, thermal conductivity and mechanical property, and the excellent comprehensive performances of the attapulgite, such as antifriction, wear resistance and repair property; (2) the preparation process of the composite additive is environment-friendly and simple, the raw materials are easy to obtain, and the cost is low; (3) the obtained nano additive has excellent long-term dispersibility and stability in lubricating oil; (4) the obtained additive can obviously reduce the friction coefficient of lubricating oil and has obvious intelligent repairing effect on the wear surface of metal.
Drawings
FIG. 1 is a comparison of infrared spectra of functionalized graphene oxide (6 mL-A/GO and 3 mL-A/GO) obtained from the use of Graphene Oxide (GO) and different coupling agents of examples I and II.
FIG. 2 is a plot of the infrared spectrum of a single pure physical hybrid (before) and 120 ℃ post hydrothermal (after) composite in example one.
FIG. 3 is an SEM image of a lower sample after a fretting wear test, with the flat within the box being the wear scar area after self-healing.
Detailed Description
The present invention will be described in detail below with reference to specific examples, but the present invention is not limited thereto in any way.
According to the invention, the functionalized graphene and the attapulgite nano particles are chemically compounded together through the silane coupling agent, so that the dispersion stability of the nano particles and the graphene can be increased, the advantages of the nano particles and the graphene can be combined, and the lubricating property of the lubricating oil can be improved to a greater extent. The effects of abrasion resistance and friction reduction are achieved, and meanwhile, the intelligent repairing effect can be achieved. At present, the functional graphene-attapulgite nano powder lubricating oil additive is not reported.
Example of implementation
(1) Graphene oxide prepared by an improved Hummers method is used as a raw material, and the obtained graphene oxide is modified by a silane coupling agent. Firstly, 1.6 g of 2.5 wt% graphene oxide aqueous solution is weighed, and 150mL deionized water is added for dilution and ultrasonic dispersion. Then, 6mL of the silane coupling agent (A-1100) was added dropwise thereto, and the mixture was magnetically stirred at room temperature for 1 hour. Finally, the mixture is transferred into a flask and is reacted for 2 hours in a water bath at 80 ℃. And standing, cooling, performing centrifugal separation, washing with water, and adding a proper amount of deionized water to obtain the functionalized graphene oxide dispersion liquid. Fig. 1 is an infrared spectrogram of Graphene Oxide (GO) and functionalized graphene oxide (6 mL-a/GO), and it can be seen from the spectrogram that functionalized graphene oxide is successfully prepared, and the coupling agent is successfully bonded with graphene oxide. .
(2) Weighing 0.08 g of attapulgite nano powder, and dissolving the attapulgite nano powder in the functionalized graphene oxide dispersion liquid; magnetically stirring for 60 min; transferring the mixture into a reaction kettle, carrying out hydrothermal reaction at 120 ℃ for 1 h, standing and cooling; and (4) performing centrifugal separation, washing with water and ethanol respectively, and drying to obtain the functionalized graphene-attapulgite lubricating oil additive. Fig. 2 is an infrared spectrogram of a purely physical mixing (before) and hydrothermal after 120 ℃ (after) functionalized graphene-attapulgite composite material, and the successful preparation of the functionalized graphene-attapulgite composite material can be seen from the spectrogram.
(3) Evaluation of tribological Properties
The prepared functionalized graphene-attapulgite lubricating oil additive is mixed with Kunlun scorpion F5000 lubricating oil in different proportions. Using HT-1000 high temperature friction abrasion tester, testing conditions are as follows: 1000 g of load, 3 mm of friction radius, 336 r/min of motor speed and 2 h of test time. The friction pair adopts a ball-disk contact mode, and the upper sample isΦ6 mm GCr15 steel ball with hardness of 770 HV; lower sample sizeΦ 45 steel of 25 mm x 8 mm and having a hardness of 250 to 300 HV. In the example, the friction and wear data of the functionalized graphene-attapulgite nano additive in the lubricating oil at different concentrations are shown in table 1, and the additive prepared by the friction coefficients at different concentrations has obvious anti-wear and anti-friction effects; FIG. 3 is an SEM image of the surface of a wear scar after friction and wear, and it can be seen from the SEM image that the width of the wear scar is about 170 μm, and the surface of the wear scar is obviously smooth compared with the side unworn part, and it can be seen that the functionalized graphene-attapulgite nano additive has an obvious intelligent repairing effect on the wear surface.
Example two
(1) Graphene oxide prepared by an improved Hummers method is used as a raw material, and the obtained graphene oxide is modified by a silane coupling agent. Firstly, 1.6 g of 2.5 wt% graphene oxide aqueous solution is weighed, and 150mL deionized water is added for dilution and ultrasonic dispersion. Then, 3 mL of the silane coupling agent (A-1100) was added dropwise thereto, and the mixture was magnetically stirred at room temperature for 1 hour. Finally, the mixture is transferred into a flask and is reacted for 2 hours in a water bath at 80 ℃. And standing, cooling, performing centrifugal separation, washing with water, and adding a proper amount of deionized water to obtain the functionalized graphene oxide dispersion liquid. Fig. 1 is an infrared spectrogram of Graphene Oxide (GO) and functionalized graphene oxide (3 mL-a/GO), and it can be seen from the spectrogram that the coupling agent is successfully bonded with the graphene oxide to obtain the functionalized graphene oxide.
(2) Weighing 0.08 g of attapulgite nano powder, and dissolving the attapulgite nano powder in the functionalized graphene oxide dispersion liquid; magnetically stirring for 60 min; transferring the mixture into a reaction kettle, carrying out hydrothermal reaction at 120 ℃ for 1 h, standing and cooling; and (4) performing centrifugal separation, washing with water and ethanol respectively, and drying to obtain the functionalized graphene-attapulgite lubricating oil additive.
(3) Evaluation of tribological Properties
Mixing the prepared functionalized graphene-attapulgite lubricating oil additive with Kunlun Scorpio F5000 lubricating oil at a certain ratio. Using HT-1000 high temperature friction abrasion tester, testing conditions are as follows: 1000 g of load, 3 mm of friction radius, 336 r/min of motor speed and 2 h of test time. The friction pair adopts a ball-disk contact mode, and the upper sample isΦ6 mm GCr15 steel ball with hardness of 770 HV; lower sample sizeΦ 45 steel of 25 mm x 8 mm and having a hardness of 250 to 300 HV. The frictional wear data are shown in table 1.
Example III
(1) Graphene oxide prepared by an improved Hummers method is used as a raw material, and the obtained graphene oxide is modified by a silane coupling agent. Firstly, 1.6 g of 2.5 wt% graphene oxide aqueous solution is weighed, and 150mL deionized water is added for dilution and ultrasonic dispersion. Then, 8 mL of the silane coupling agent (A-1110) was added dropwise thereto, and the mixture was magnetically stirred at room temperature for 0.5 h. Finally transferring the mixture into a flask, carrying out water bath reaction at 60 ℃ for 1 h, standing and cooling; and (4) performing centrifugal separation, washing with water, and adding a proper amount of absolute ethyl alcohol to obtain the functionalized graphene oxide dispersion liquid.
(2) Weighing 0.32 g of attapulgite nano powder, and dissolving the attapulgite nano powder in the functionalized graphene oxide dispersion liquid; magnetically stirring for 30 min; transferring to a reaction kettle, carrying out thermal reaction for 0.5 h by using a solvent (ethanol) at 100 ℃, standing and cooling; and (4) performing centrifugal separation, washing with water and ethanol respectively, and drying to obtain the functionalized graphene-attapulgite lubricating oil additive.
(3) Evaluation of tribological Properties
Mixing the prepared functionalized graphene-attapulgite lubricating oil additive with Kunlun Scorpio F5000 lubricating oil at a certain ratio. Using HT-1000 high temperature friction abrasion tester, testing conditions are as follows: 1000 g of load, 3 mm of friction radius, 336 r/min of motor speed and 2 h of test time. The friction pair adopts a ball-disk contact mode, and the upper sample isΦ6 mm GCr15 steel ball with hardness of 770 HV; lower sample sizeΦ 45 steel of 25 mm x 8 mm and having a hardness of 250 to 300 HV. The frictional wear data are shown in table 1.
Example four
(1) Graphene oxide prepared by an improved Hummers method is used as a raw material, and the obtained graphene oxide is modified by a silane coupling agent. Firstly, 1.6 g of 2.5 wt% graphene oxide aqueous solution is weighed, and 150mL of absolute ethyl alcohol is added for dilution and ultrasonic dispersion to be uniform. Then, 1mL of the silane coupling agent (A-1120) was added dropwise thereto, and the mixture was magnetically stirred at room temperature for 2 hours. Finally transferring the mixture into a reaction kettle, carrying out solvothermal reaction for 3 hours at the temperature of 95 ℃, standing and cooling; and (4) performing centrifugal separation, washing with water, and adding a proper amount of absolute ethyl alcohol to obtain the functionalized graphene oxide dispersion liquid.
(2) Weighing 0.02 g of attapulgite nano powder, and dissolving the attapulgite nano powder in the functionalized graphene oxide dispersion liquid; magnetically stirring for 90 min; transferring the mixture into a reaction kettle, carrying out thermal reaction for 2 hours by using a solvent (ethanol) at the temperature of 140 ℃, standing and cooling; and (4) performing centrifugal separation, washing with water and ethanol respectively, and drying to obtain the functionalized graphene-attapulgite lubricating oil additive.
(3) Evaluation of tribological Properties
Mixing the prepared functionalized graphene-attapulgite lubricating oil additive with Kunlun Scorpio F5000 lubricating oil at a certain ratio. Using HT-1000 high temperature friction abrasion tester, testing conditions are as follows: 1000 g of load, 3 mm of friction radius, 336 r/min of motor speed and 2 h of test time. The friction pair adopts a ball-disk contact mode, and the upper sample isΦ6 mm GCr15 steel ball with hardness of 770 HV; lower sample sizeΦ 45 steel of 25 mm x 8 mm and having a hardness of 250 to 300 HV. The frictional wear data are shown in table 1.
Example five
(1) Graphene oxide prepared by an improved Hummers method is used as a raw material, and the obtained graphene oxide is modified by a silane coupling agent. Firstly, 1.6 g of 2.5 wt% graphene oxide aqueous solution is weighed, and 150mL of absolute ethyl alcohol is added for dilution and ultrasonic dispersion to be uniform. Then, 3 mL of a silane coupling agent (KBM-602) was added dropwise thereto, and the mixture was magnetically stirred at room temperature for 1 hour. Finally, the mixture is transferred into a flask and refluxed in a water bath at the temperature of 75 ℃ for 2 hours. And standing, cooling, performing centrifugal separation, washing with water, and adding a proper amount of deionized water to obtain the functionalized graphene oxide dispersion liquid.
(2) Weighing 0.16 g of attapulgite nano powder, and dissolving the attapulgite nano powder in the functionalized graphene oxide dispersion liquid; magnetically stirring for 60 min; transferring the mixture into a reaction kettle, carrying out hydrothermal reaction at 180 ℃ for 1 h, standing and cooling; and (4) performing centrifugal separation, washing with water and ethanol respectively, and drying to obtain the functionalized graphene-attapulgite lubricating oil additive.
(3) Evaluation of tribological Properties
Mixing the prepared functionalized graphene-attapulgite lubricating oil additive with Kunlun Scorpio F5000 lubricating oil in a certain proportion. Using HT-1000 high temperature friction abrasion tester, testing conditions are as follows: 1000 g of load, 3 mm of friction radius, 336 r/min of motor speed and 2 h of test time. The friction pair adopts a ball-disk contact mode, and the upper sample isΦ6 mm GCr15 steel ball with hardness of 770 HV; lower sample sizeΦ 45 steel of 25 mm x 8 mm and having a hardness of 250 to 300 HV. The frictional wear data are shown in table 1.
TABLE 1 Friction and wear coefficient of functionalized graphene-Attapulgite lubricating oil additive in lubricating oil
Claims (9)
1. The functionalized graphene-attapulgite nano composite material is characterized in that the functionalized graphene oxide is prepared by modifying graphene oxide by adopting an aminosilane coupling agent, then the functionalized graphene oxide is bonded with attapulgite nano particles by a chemical method, and the nano composite material is obtained by heating and reducing;
the method specifically comprises the following steps:
firstly, preparing a dispersion liquid of graphene oxide by using the graphene oxide prepared by an improved Hummers method as a raw material, adding a silane coupling agent, stirring at room temperature for 0.5-2 h, heating at 60-95 ℃ for reaction for 1-3 h, cooling to room temperature, performing centrifugal separation, and cleaning to obtain functionalized graphene oxide;
secondly, dissolving the attapulgite nano powder into the functionalized graphene oxide dispersion liquid, stirring, heating and reacting at 100-180 ℃ for 0.5-2 h, standing and cooling; and carrying out centrifugal separation and cleaning to obtain the composite material.
2. The nanocomposite of claim 1, wherein the aminosilane coupling agent is any one of a-1100, a-1110, a-1120, and KBM-602.
3. The nanocomposite material of claim 1, wherein the mass ratio of attapulgite to graphene oxide is 0.5-8: 1.
4. The method for preparing the functionalized graphene-attapulgite nanocomposite material according to any one of claims 1 to 3, comprising the following steps:
firstly, preparing a dispersion liquid of graphene oxide by using the graphene oxide prepared by an improved Hummers method as a raw material, adding a silane coupling agent, stirring at room temperature for 0.5-2 h, heating at 60-95 ℃ for reaction for 1-3 h, cooling to room temperature, performing centrifugal separation, and cleaning to obtain functionalized graphene oxide;
secondly, dissolving the attapulgite nano powder into the functionalized graphene oxide dispersion liquid, stirring, heating and reacting at 100-180 ℃ for 0.5-2 h, standing and cooling; and carrying out centrifugal separation and cleaning to obtain the composite material.
5. The preparation method according to claim 4, wherein in the first step, the addition amount of the silane coupling agent is 25-200 mL per gram of graphene oxide; the dispersant in the dispersion of graphene oxide is water or ethanol.
6. The preparation method according to claim 4, wherein in the second step, the dispersant in the functionalized graphene oxide dispersion is water or ethanol; dissolving the attapulgite nano powder into the functionalized graphene oxide dispersion liquid, and stirring for 30-90 min.
7. The use of the functionalized graphene-attapulgite nanocomposite material according to any one of claims 1 to 3 as a lubricant additive, wherein the additive is present in the lubricant in an amount of 0.01 to 0.5% by mass.
8. Use according to claim 7, wherein the lubricating oil is a mineral base oil or a synthetic base oil.
9. The use as claimed in claim 7, wherein the lubricant is a Kunlun Scorpio type F5000, SF15W-40 or great wall SJ10W-40 lubricant.
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| CN105154170A (en) * | 2015-09-21 | 2015-12-16 | 西南石油大学 | Preparation method of nanometer boehmite composite oxidized graphene antiwear lubricant |
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