CN116042291A - Lubricating oil composite additive containing graphene molybdenum disulfide of ionic liquid and preparation and application thereof - Google Patents
Lubricating oil composite additive containing graphene molybdenum disulfide of ionic liquid and preparation and application thereof Download PDFInfo
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- CN116042291A CN116042291A CN202310017904.4A CN202310017904A CN116042291A CN 116042291 A CN116042291 A CN 116042291A CN 202310017904 A CN202310017904 A CN 202310017904A CN 116042291 A CN116042291 A CN 116042291A
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- lubricating oil
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- ionic liquid
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 73
- 229910021389 graphene Inorganic materials 0.000 title claims abstract description 70
- 239000010687 lubricating oil Substances 0.000 title claims abstract description 57
- 239000000654 additive Substances 0.000 title claims abstract description 47
- 230000000996 additive effect Effects 0.000 title claims abstract description 39
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 title claims abstract description 32
- 229910052982 molybdenum disulfide Inorganic materials 0.000 title claims abstract description 32
- 239000002608 ionic liquid Substances 0.000 title claims abstract description 16
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- 239000002131 composite material Substances 0.000 title description 6
- 239000002086 nanomaterial Substances 0.000 claims abstract description 12
- 239000002270 dispersing agent Substances 0.000 claims abstract description 10
- 238000004519 manufacturing process Methods 0.000 claims abstract description 7
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 28
- 238000000498 ball milling Methods 0.000 claims description 24
- 239000000463 material Substances 0.000 claims description 16
- 239000003795 chemical substances by application Substances 0.000 claims description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 239000000706 filtrate Substances 0.000 claims description 5
- 229920002367 Polyisobutene Polymers 0.000 claims description 4
- 229960002317 succinimide Drugs 0.000 claims description 4
- BSWXAWQTMPECAK-UHFFFAOYSA-N 6,6-diethyloctyl dihydrogen phosphate Chemical compound CCC(CC)(CC)CCCCCOP(O)(O)=O BSWXAWQTMPECAK-UHFFFAOYSA-N 0.000 claims description 3
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 3
- 239000002202 Polyethylene glycol Substances 0.000 claims description 3
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 3
- -1 alkenyl succinimide Chemical compound 0.000 claims description 3
- 229910052787 antimony Inorganic materials 0.000 claims description 3
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 claims description 3
- KZNICNPSHKQLFF-UHFFFAOYSA-N dihydromaleimide Natural products O=C1CCC(=O)N1 KZNICNPSHKQLFF-UHFFFAOYSA-N 0.000 claims description 3
- 229910002804 graphite Inorganic materials 0.000 claims description 3
- 239000010439 graphite Substances 0.000 claims description 3
- 229910052750 molybdenum Inorganic materials 0.000 claims description 3
- 239000011733 molybdenum Substances 0.000 claims description 3
- 229920001223 polyethylene glycol Polymers 0.000 claims description 3
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims description 3
- 229920002554 vinyl polymer Polymers 0.000 claims description 3
- 229910052725 zinc Inorganic materials 0.000 claims description 3
- 239000011701 zinc Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 2
- 238000003801 milling Methods 0.000 claims description 2
- LDVVTQMJQSCDMK-UHFFFAOYSA-N 1,3-dihydroxypropan-2-yl formate Chemical compound OCC(CO)OC=O LDVVTQMJQSCDMK-UHFFFAOYSA-N 0.000 claims 1
- 239000002064 nanoplatelet Substances 0.000 claims 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims 1
- 238000005299 abrasion Methods 0.000 description 7
- 239000002105 nanoparticle Substances 0.000 description 7
- KXDHJXZQYSOELW-UHFFFAOYSA-M Carbamate Chemical compound NC([O-])=O KXDHJXZQYSOELW-UHFFFAOYSA-M 0.000 description 6
- 235000019441 ethanol Nutrition 0.000 description 6
- 239000002135 nanosheet Substances 0.000 description 6
- 238000011160 research Methods 0.000 description 6
- 239000002199 base oil Substances 0.000 description 5
- 230000001050 lubricating effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000002114 nanocomposite Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 229910019142 PO4 Inorganic materials 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- VBICKXHEKHSIBG-UHFFFAOYSA-N beta-monoglyceryl stearate Natural products CCCCCCCCCCCCCCCCCC(=O)OCC(O)CO VBICKXHEKHSIBG-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 229910052976 metal sulfide Inorganic materials 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 2
- 239000010452 phosphate Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 238000005411 Van der Waals force Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000007866 anti-wear additive Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 230000009347 mechanical transmission Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000002390 rotary evaporation Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
Classifications
-
- 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
- C10M163/00—Lubricating compositions characterised by the additive being a mixture of a compound of unknown or incompletely defined constitution and a non-macromolecular compound, each of these compounds being essential
-
- 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
-
- 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
- C10M2201/06—Metal compounds
- C10M2201/065—Sulfides; Selenides; Tellurides
- C10M2201/066—Molybdenum sulfide
-
- 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
- C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
- C10M2215/086—Imides
-
- 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
- C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
- C10M2215/28—Amides; Imides
-
- 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
- C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
- C10M2219/06—Thio-acids; Thiocyanates; Derivatives thereof
- C10M2219/062—Thio-acids; Thiocyanates; Derivatives thereof having carbon-to-sulfur double bonds
- C10M2219/066—Thiocarbamic type compounds
- C10M2219/068—Thiocarbamate metal salts
-
- 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
- C10M2223/00—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions
- C10M2223/02—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions having no phosphorus-to-carbon bonds
- C10M2223/04—Phosphate esters
- C10M2223/045—Metal containing thio derivatives
-
- 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
- C10N2030/04—Detergent property or dispersant property
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/54—Improvements relating to the production of bulk chemicals using solvents, e.g. supercritical solvents or ionic liquids
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Lubricants (AREA)
Abstract
The invention relates to a graphene-based lubricating oil additive, which comprises the following components in percentage by mass: 2-10% of graphene or graphene oxide, 1-20% of molybdenum disulfide nano material, 29-40% of ionic liquid and 40-59% of dispersing agent. The invention also relates to a preparation method and application of the lubricating oil additive. The lubricating oil additive has the advantages of stable dispersibility and good antifriction and antiwear properties. The preparation method is environment-friendly, is easy for mass production and has lower production cost.
Description
Technical Field
The invention relates to the technical field of lubricating materials, in particular to a graphene-based lubricating oil additive, and a preparation method and application thereof.
Background
Friction and abrasion are one of the serious problems encountered in production and life, and friction and abrasion can consume a large amount of energy, so that the abrasion failure of mechanical transmission parts can be caused, and the service life is reduced. With the development of modern industry and the increasing of mechanical manufacturing technology, a large number of high-speed and heavy-load working states appear, so that higher requirements on high-temperature bearing capacity and antifriction and antiwear performance of lubricating oil are put forward. Lubricating oil additives are critical to improving lubricating oil performance. In the current lubricating oil market, traditional lubricating oil still dominates, but cannot meet the current working demands due to the limited lubricating capacity. Therefore, research on novel lubricating oil additives is widely focused by a plurality of scholars at home and abroad, and research on nano materials as lubricating oil additives is gradually one of the hot spots of current research. The nano lubricating oil additive integrates the advantages of extreme pressure resistance, abrasion resistance and lubricity, can well adapt to conditions of high load and low rotation speed, and can reduce friction factors in the later friction stage, which is a difficult problem that cannot be solved by conventional load additives.
The graphene serving as a novel material has the advantages of unique two-dimensional nano layered structure, high mechanical strength, high heat conduction capacity and the like, and is considered as an excellent antifriction and antiwear additive. Graphene is a two-dimensional smooth nanomaterial with low surface energy, can be used for reducing the adhesive force and friction force of various surfaces instead of a solid film, and the super-strong mechanical strength of the graphene can also inhibit material abrasion, so that a friction adsorption film and a dual transfer film can be formed at a friction interface, and the direct contact of friction dual surfaces can be prevented, thereby improving the bearing capacity of the lubricant and ensuring better wear resistance.
The application of the graphene in the field of friction and wear of lubricating oil has been widely reported and researched, and the research shows that the graphene is excellent in self-lubricity and has a friction coefficient close to zero. However, graphene is extremely easy to agglomerate in lubricating oil due to the existence of Van der Waals force, and the lubricating performance of the graphene is difficult to fully develop. In addition, in the initial research stage of graphene nanoparticle additives, most of the graphene nanoparticle additives are concentrated on the addition of a single graphene species, which improves the performance of the lubricating oil, but all advantages of graphene have not been fully exerted.
In recent years, research on composite nanoparticle additives has become a new hot spot, and the composite nanoparticles mean that two or more types of nanoparticles are stably and uniformly dispersed in lubricating oil, and the properties and action mechanisms of different particles are utilized, so that the performance of the lubricating oil can be remarkably improved. Numerous studies have shown that graphene is a good nanoparticle carrier, whereas graphene-based nanocomposites generally exhibit better lubrication properties than pure graphene. In addition, the nano composite material prepared by the graphene and the graphene-like layered metal sulfide shows remarkable physical and chemical properties, probably due to the compatibility and synergistic effect of the structures of the graphene and the graphene-like layered metal sulfide, so that the effect of the graphene composite material as the lubricating oil antiwear agent is discussed, and the nano composite material has very important significance for further improving the performance of the lubricating oil, solving the energy crisis and improving the energy use efficiency.
Disclosure of Invention
Based on the defects of insufficient dispersibility and abrasion resistance of the existing graphene additive, the invention provides the graphene-based lubricating oil additive which has the advantages of stable dispersibility, good antifriction and abrasion resistance.
The technical scheme adopted by the invention is as follows:
the lubricating oil additive based on graphene comprises the following components in percentage by mass: 2-10% of graphene or graphene oxide, 1-20% of molybdenum disulfide, 29-40% of ionic liquid, 40-59% of dispersing agent and 5-10% of antiwear agent.
According to the invention, graphene and molybdenum disulfide nano materials are compounded to obtain graphene-based nano molybdenum disulfide as a lubricating oil additive, so that the defects of the graphene-based nano molybdenum disulfide can be made up, the advantages of the graphene-based nano molybdenum disulfide and the molybdenum disulfide are fully reflected, and the wear resistance of lubricating oil is effectively improved. In the lubricating oil additive disclosed by the invention, graphene and molybdenum disulfide both show excellent wear resistance under a wet condition, and the loading of molybdenum disulfide nano particles on the surface of graphene can not only effectively inhibit (oxidize) graphene agglomeration, but also maintain the original performances of graphene and molybdenum disulfide, and can also generate a good synergistic effect; in addition, the ionic liquid can increase the lipophilicity of (oxidized) graphene, thereby increasing the stability of the additive in the lubricating oil.
The lubricating oil additive disclosed by the invention has the advantages of stable dispersibility and good antifriction and antiwear properties.
Preferably, the graphene or graphite oxide has a sheet diameter ranging from 1 to 10 mu m, and the number of layers is less than 10.
Preferably, the molybdenum disulfide nano material is a molybdenum disulfide nano sheet with a sheet diameter ranging from 5 nm to 15000nm. Similar to graphene oxide, the molybdenum disulfide nanosheets are typical lamellar compounds, have the advantages of extremely stable chemical properties, alkali resistance, acid resistance, high temperature resistance and the like, and are potential novel lubricating materials.
Preferably, the dispersing agent is any one or a mixture of at least two of polyisobutylene bissuccinimide, triethylhexyl phosphoric acid, vinyl bisstearamide, stearic acid monoglyceride, polyethylene glycol and mono alkenyl succinimide.
Preferably, the antiwear agent is any one or a mixture of at least two of zinc dithiodialkyl phosphate, molybdenum dithiodialkyl carbamate, lead dithiodialkyl carbamate and antimony dithiodialkyl carbamate.
Preferably, the lubricating oil additive is made by milling.
The invention also provides a preparation method of the lubricating oil additive, which comprises the following steps:
(1) Adding graphene or graphene oxide, molybdenum disulfide nano material, ionic liquid, a dispersing agent and an antiwear agent into a ball mill according to a proportion, adding ethanol, introducing liquid nitrogen into the ball mill for precooling, and then performing ball milling;
(2) And filtering the obtained material after ball milling, and removing ethanol in the filtrate to obtain the lubricating oil additive.
The ionic liquid can react with graphene oxide in ball milling, so that the lipophilicity of the graphene oxide is increased, and the stability of the additive in lubricating oil is improved. The larger the sheet diameter of the graphene and molybdenum disulfide is, the longer the ball milling time is.
The invention is characterized in thatThe preparation method does not generate toxic H 2 S and other gases, is environment-friendly and safe to produce, and the prepared lubricating oil additive is black oily liquid, is convenient to add, and is beneficial to industrial production and use of the later-stage lubricating oil. In addition, the preparation method is simple, consists of two basic chemical unit operations of ball milling and filtering, is easy for mass production and has lower production cost.
Preferably, in the step (1), the volume ratio of the ionic liquid to the ethanol is 1:10-20, and the precooling time is 5-20 min.
Preferably, in the step (1), the ball mill is a planetary ball mill, and the ball milling conditions are: the ball material mass ratio is 2:0.2-1, the ball milling rotating speed is 100-1000 rpm/min, and the ball milling time is 0.5-2 h.
The invention also provides application of the lubricating oil additive in lubricating oil.
Detailed Description
The graphene-based lubricating oil additive disclosed by the invention comprises the following components in percentage by mass: 2-10% of graphene or graphene oxide, 1-20% of molybdenum disulfide nano material, 29-40% of ionic liquid, 40-59% of dispersing agent and 5-10% of antiwear agent.
Specifically, the graphene or graphite oxide has a sheet diameter ranging from 1 to 10 mu m, and the number of layers is less than 10. The molybdenum disulfide nano material can be a molybdenum disulfide nano sheet, and the sheet diameter range is 5-15000 nm.
The dispersing agent is specifically selected from any one or a mixture of at least two of polyisobutylene bissuccinimide, triethylhexyl phosphoric acid, vinyl bisstearamide, stearic acid monoglyceride, polyethylene glycol and mono alkenyl succinimide.
The antiwear agent is specifically selected from any one or a mixture of at least two of zinc dithiodialkyl phosphate, molybdenum dithiodialkyl carbamate, lead dithiodialkyl carbamate and antimony dithiodialkyl carbamate.
The preparation method of the lubricating oil additive comprises the following steps:
(1) Graphene or graphene oxide, molybdenum disulfide nano material, ionic liquid, a dispersing agent and an antiwear agent are added into a ball mill according to the proportion, ethanol is added, liquid nitrogen is introduced into the ball mill for precooling, and then ball milling is carried out.
In the step (1), adding ionic liquid and ethanol in a volume ratio of 1:10-20, and introducing liquid nitrogen for precooling for 5-20 min; the ball mill is a planetary ball mill, and the ball milling conditions are as follows: the ball material mass ratio is 2:0.2-1, the ball milling rotating speed is 100-1000 rpm/min, and the ball milling time is 0.5-2 h.
(2) Filtering the obtained material after ball milling, and removing ethanol in the filtrate by means of heating volatilization, rotary evaporation and the like to obtain the lubricating oil additive.
The lubricating oil additive can be compounded with conventional base oil to form lubricating oil.
Example 1
The graphene-based lubricating oil additive is prepared as follows:
(1) Adding 0.4g of double-layer graphene oxide with a sheet diameter of 5 mu m, 0.2g of molybdenum disulfide nano-sheet with a sheet diameter of 2 mu m, 3ml (2.67 g) of ionic liquid, 4g of polyisobutylene bissuccinimide, 0.5g of antiwear agent and 60ml of absolute ethyl alcohol into a planetary ball mill simultaneously, introducing liquid nitrogen into the ball mill for precooling for 10min, and then ball milling for 40min under the conditions of a ball material mass ratio of 20:1 and a ball milling rotating speed of 200 rpm/min.
(2) And after ball milling, mounting a stainless steel filter on a grinding bowl, filtering the obtained material, and volatilizing and removing absolute ethyl alcohol in the filtrate to obtain the graphene-based lubricating oil additive.
Example 2
The graphene-based lubricating oil additive is prepared as follows:
(1) Adding 0.4g of double-layer graphene oxide with the sheet diameter of 10 mu m, 0.3g of molybdenum disulfide nano-sheet with the sheet diameter of 5 mu m, 4ml (3.56 g) of ionic liquid, 7g of polyisobutylene-bis-succinimide, 1g of antiwear agent and 60ml of absolute ethyl alcohol into a planetary ball mill simultaneously, introducing liquid nitrogen into the ball mill for precooling for 15min, and then ball-milling for 90min under the conditions of a ball material mass ratio of 20:1 and a ball milling rotating speed of 400 rpm/min.
(2) And after ball milling, mounting a stainless steel filter on a grinding bowl, filtering the obtained material, and volatilizing and removing absolute ethyl alcohol in the filtrate to obtain the graphene-based lubricating oil additive.
In the lubricating oil additive disclosed by the invention, due to weak interface interaction between graphene and the molybdenum disulfide nanosheets, the addition of molybdenum disulfide can prevent aggregation of graphene to a certain extent, so that friction is very facilitated.
The following table shows the effect on the plaque diameter and coefficient of friction for the base oil, base oil with 0.05% graphene added, and base oil with 0.05% molybdenum disulfide/graphene added, respectively, as lubricating oil additives.
| Additive agent | Plaque diameter/. Mu.m | Coefficient of friction |
| Base oil (PAO 4) | 1134 | 0.148 |
| Graphene (content 0.05%) | 900 | 0.065 |
| Molybdenum disulfide/graphene (content 0.05%) | 700 | 0.050 |
From the table, compared with the method only adding graphene, the molybdenum disulfide/graphene composite can achieve better antifriction effect.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that several variations and modifications could be made by those skilled in the art without departing from the inventive concept.
Claims (10)
1. The graphene-based lubricating oil additive is characterized by comprising the following components in percentage by mass: 2-10% of graphene or graphene oxide, 1-20% of molybdenum disulfide nano material, 29-40% of ionic liquid, 40-59% of dispersing agent and 5-10% of antiwear agent.
2. The lubricating oil additive of claim 1, wherein the graphene or graphite oxide has a sheet diameter ranging from 1 to 10 μm and a number of layers less than 10 layers.
3. The lubricating oil additive of claim 1 wherein the molybdenum disulfide nanomaterials are molybdenum disulfide nanoplatelets having a platelet diameter in the range of 5 to 15000nm.
4. The lubricating oil additive of claim 1, wherein the dispersant is any one or a mixture of at least two of polyisobutylene bissuccinimide, triethylhexyl phosphoric acid, vinyl bisstearamide, monoglyceride stearate, polyethylene glycol, mono alkenyl succinimide.
5. The lubricating oil additive of claim 1 wherein the antiwear agent is any one or a mixture of at least two of zinc dithiodialkylphosphate, molybdenum dithiodialkylcarbamate, lead dithiodialkylcarbamate, antimony dithiodialkylcarbamate.
6. The lubricating oil additive of any one of claims 1 to 5, prepared by milling.
7. The method for preparing the lubricating oil additive according to claim 1, comprising the steps of:
(1) Adding graphene or graphene oxide, molybdenum disulfide nano material, ionic liquid, a dispersing agent and an antiwear agent into a ball mill according to a proportion, adding ethanol, introducing liquid nitrogen into the ball mill for precooling, and then performing ball milling;
(2) And filtering the obtained material after ball milling, and removing ethanol in the filtrate to obtain the lubricating oil additive.
8. The method of manufacturing according to claim 7, wherein: in the step (1), the volume ratio of the ionic liquid to the ethanol is 1:10-20, and the precooling time is 5-20 min.
9. The preparation method according to claim 7 or 8, characterized in that: in the step (1), the ball mill is a planetary ball mill, and the ball milling conditions are as follows: the ball material mass ratio is 2:0.2-1, the ball milling rotating speed is 100-1000 rpm/min, and the ball milling time is 0.5-2 h.
10. Use of the lubricating oil additive according to any one of claims 1 to 5 in lubricating oils.
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