CN110776975A - Titanate modified graphene oxide slurry, lubricating oil composition and preparation method thereof - Google Patents
Titanate modified graphene oxide slurry, lubricating oil composition and preparation method thereof Download PDFInfo
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- 238000002360 preparation method Methods 0.000 title abstract description 15
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- 238000001132 ultrasonic dispersion Methods 0.000 claims abstract description 22
- 239000007822 coupling agent Substances 0.000 claims abstract description 18
- 239000003921 oil Substances 0.000 claims description 39
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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
- C10M159/00—Lubricating compositions characterised by the additive being of unknown or incompletely defined constitution
- C10M159/12—Reaction products
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/15—Nano-sized carbon materials
- C01B32/182—Graphene
- C01B32/194—After-treatment
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/15—Nano-sized carbon materials
- C01B32/182—Graphene
- C01B32/198—Graphene oxide
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07F—ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAINING ELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN, SULFUR, SELENIUM OR TELLURIUM
- C07F7/00—Compounds containing elements of Groups 4 or 14 of the Periodic Table
- C07F7/28—Titanium compounds
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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
- C10M141/00—Lubricating compositions characterised by the additive being a mixture of two or more compounds covered by more than one of the main groups C10M125/00 - C10M139/00, each of these compounds being essential
- C10M141/12—Lubricating compositions characterised by the additive being a mixture of two or more compounds covered by more than one of the main groups C10M125/00 - C10M139/00, each of these compounds being essential at least one of them being an organic compound containing atoms of elements not provided for in groups C10M141/02 - C10M141/10
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- C07—ORGANIC CHEMISTRY
- C07B—GENERAL METHODS OF ORGANIC CHEMISTRY; APPARATUS THEREFOR
- C07B2200/00—Indexing scheme relating to specific properties of organic compounds
- C07B2200/11—Compounds covalently bound to a solid support
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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
- C10M2201/14—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
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2227/00—Organic non-macromolecular compounds containing atoms of elements not provided for in groups C10M2203/00, C10M2207/00, C10M2211/00, C10M2215/00, C10M2219/00 or C10M2223/00 as ingredients in lubricant compositions
- C10M2227/06—Organic compounds derived from inorganic acids or metal salts
- C10M2227/065—Organic compounds derived from inorganic acids or metal salts derived from Ti or Zr
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- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Lubricants (AREA)
Abstract
The invention provides titanate modified graphene oxide slurry, a lubricating oil composition and a preparation method thereof, and belongs to the technical field of graphene oxide modified lubrication. The method comprises the steps of carrying out ultrasonic dispersion on graphene oxide and a titanate coupling agent, and taking upper-layer slurry to obtain the titanate modified graphene oxide slurry. The modified graphene oxide slurry provided by the invention directly modifies graphene oxide under ultrasound by taking titanate coupling agent as modifying agent, improves the grafting efficiency of graphene oxide and protects the intrinsic structure and performance of graphene materials. In addition, the composition formed by mixing the titanate modified graphene oxide slurry with the lubricating oil has excellent dispersibility, stability and abrasion resistance, and the data of the examples show that: the titanate modified graphene oxide lubricating oil composition can keep stable and non-settling for 0 day in a high-temperature settling performance test at 120 ℃, and does not settle for 180 days at normal temperature.
Description
Technical Field
The invention relates to the technical field of graphene oxide modified lubrication, in particular to titanate modified graphene oxide slurry, a lubricating oil composition and a preparation method thereof.
Background
Graphene is a two-dimensional planar honeycomb lattice structure with a large specific surface area and chemical inertness. After the graphene is used as a lubricating additive and added into base oil, the antifriction and abrasion resistance of the lubricating oil can be greatly enhanced; meanwhile, the extreme pressure performance and the bearing capacity of the lubricating oil are improved. However, due to the fact that the unique structure of graphene is weak in binding property with base oil and easy to agglomerate and settle, the service performance of graphene is affected. Therefore, graphene needs to be added into base oil after being subjected to organic treatment to ensure dispersion stability so as to fully exert the friction reduction and wear resistance of the graphene. The method for maintaining good dispersion stability of graphene is generally a chemical modification method, that is, a modifying agent is adopted to modify a graphene precursor (graphene oxide) and reduce the graphene precursor (graphene oxide) to obtain modified graphene, and the method can improve the surface performance of graphene, so that the dispersibility and stability of the graphene and base oil are improved. In the existing titanate modified graphene oxide technology, graphene oxide is usually mixed with titanate and hydrazine hydrate, and then the titanate is grafted to graphene while reducing the graphene oxide, but water in the hydrazine hydrate can influence the reaction activity of monoalkoxy titanate, so that the grafting rate of the prepared modified graphene is low, and the hydrazine hydrate is an application that a highly toxic substance is not beneficial to industrial production.
Disclosure of Invention
In view of this, the present invention aims to provide a titanate modified graphene oxide slurry, a lubricating oil composition and a preparation method thereof. The titanate modified graphene oxide slurry provided by the invention directly modifies graphene oxide by adopting a titanate coupling agent, has high grafting rate on graphene oxide, does not use highly toxic substances in the preparation process, is environment-friendly and green, and is beneficial to industrial production.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides titanate modified graphene oxide slurry, which is obtained by ultrasonically dispersing graphene oxide and a titanate coupling agent and taking upper-layer slurry;
the solid content of the titanate modified graphene oxide slurry is not less than 60%.
Preferably, the dosage ratio of the graphene oxide to the titanate coupling agent is 1-5 g: 100 mL.
Preferably, the titanate coupling agent comprises a monoalkoxy titanate.
Preferably, the temperature of the ultrasonic dispersion is 40-80 ℃, and the time is 4-8 h.
Preferably, the manner of taking the upper layer of slurry comprises standing or centrifuging; the standing time is 24-36 h.
Preferably, the rotation speed of the centrifugation is 8000 r/min.
The invention also provides a lubricating oil composition, which comprises the titanate modified graphene oxide slurry and lubricating oil.
Preferably, the content of the titanate modified graphene oxide in the lubricating oil composition is 0.04-0.1 wt%.
Preferably, the lubricating oil comprises transmission oil, lubricating grease oil, gear oil, static hydraulic oil or antiwear hydraulic oil.
The invention also provides a preparation method of the lubricating oil composition in the technical scheme, which comprises the following steps:
and ultrasonically dispersing the titanate modified graphene oxide slurry and lubricating oil for 5-10 min under the power of 200-500W to obtain the lubricating oil composition.
The invention provides titanate modified graphene oxide slurry which is obtained by ultrasonically dispersing graphene oxide and a titanate coupling agent and taking upper-layer slurry, wherein the solid content of the titanate modified graphene oxide slurry is not less than 60%. The modified graphene oxide slurry provided by the invention is prepared by directly modifying graphene oxide under ultrasound by using a titanate coupling agent as a modifying agent, and the modification mode can enable chemical grafting and physical grafting, so that the grafting efficiency of the graphene oxide is improved, and the intrinsic structure and performance of the graphene material are protected. Meanwhile, toxic substances are not used in the process of preparing the titanate modified graphene oxide slurry, so that the method is green and environment-friendly and is beneficial to industrial production.
Further, since the monoalkoxy titanate is greatly affected by the environment, the reactivity of the monoalkoxy titanate is reduced if water is added during the modification. Therefore, the modification mode of directly mixing the monoalkoxy titanate and the graphene oxide (without adding water) can improve the modification efficiency of the graphene oxide, so that the obtained titanate-modified graphene oxide has good dispersibility in the lubricating oil.
The invention also provides a lubricating oil composition, which comprises the titanate modified graphene oxide slurry and lubricating oil. The lubricating oil mixture provided by the invention has excellent dispersibility, stability and good wear resistance, and the wear rate is reduced by more than several orders of magnitude. The data of the examples show that: the lubricating oil composition provided by the invention can be kept stable and not settled for 30 days in a 120 ℃ high-temperature settlement performance test, and has excellent dispersion stability; meanwhile, the lubricating oil composition does not settle for 180 days at normal temperature, so that good dispersion stability is guaranteed, and the whole process flow is greatly simplified.
Drawings
Fig. 1 is a Raman spectrum of titanate-modified graphene oxide and unmodified graphene oxide obtained in example 1;
fig. 2 is a transmission electron microscope image of titanate-modified graphene oxide obtained in this example 1 and unmodified graphene oxide at different magnifications;
FIG. 3 is an XPS spectrum of titanate-modified graphene oxide and unmodified graphene oxide obtained in example 1;
FIG. 4 is a graph showing the effect of the lubricating oil compositions obtained in examples 1 to 5 after standing for 180 days;
FIG. 5 is a graph showing the effects of the lubricating oil compositions obtained in examples 1 to 5 after standing at 120 ℃ for 30 days;
FIG. 6 is a graph of the effect of settling after 1 day of addition of unmodified graphene oxide to transmission oil, lubricating grease oil, gear oil, static hydraulic oil and antiwear hydraulic oil;
FIG. 7 is a graph of wear scar on a friction pair lubricated for 2 hours with a static hydraulic fluid and the lubricating oil composition of example 4;
FIG. 8 is a graph of wear scar on a friction pair lubricated with an antiwear hydraulic fluid and the lubricating oil composition from example 5.
Detailed Description
The invention provides titanate modified graphene oxide slurry, which is obtained by ultrasonically dispersing graphene oxide and a titanate coupling agent and taking upper-layer slurry; the solid content of the titanate modified graphene oxide slurry is not less than 60%.
In the invention, the preferable dosage ratio of the graphene oxide to the titanate coupling agent is 1-5 g: 100 mL. In the present invention, the titanate coupling agent is preferably a monoalkoxy type titanate. In the present invention, since the monoalkoxy titanate is greatly affected by the environment, the addition of water at the time of modification reduces the reactivity of the monoalkoxy titanate. Therefore, the modification mode (without adding water) of directly mixing the monoalkoxy titanate and the graphene oxide can improve the modification efficiency of the graphene oxide and improve the dispersibility of the graphene oxide in the lubricating oil.
The source of the graphene oxide is not particularly limited, and commercially available products or self-made products known to those skilled in the art can be adopted; the source of the titanate coupling agent is not particularly limited in the present invention, and commercially available products known to those skilled in the art may be used, specifically JTW-101 monoalkoxy titanate, NDZ-201 monoalkoxy titanate, TMC-101 monoalkoxy titanate.
In the invention, the temperature of ultrasonic dispersion is preferably 40-80 ℃, more preferably 50-70 ℃, and more preferably 60 ℃; the time for ultrasonic dispersion is preferably 4-8 h, and further preferably 5-7 h.
In the present invention, the manner of taking the upper layer slurry preferably includes standing or centrifugation; the standing time is preferably 24-36 h, and more preferably 24 h. In the invention, the ultrasonic dispersion liquid is kept stand for 24-36 h, which is beneficial to further improving the modification efficiency of the graphene oxide. In the present invention, the rotation speed of the centrifugation is preferably 8000 r/min.
In the invention, the modification mode of the titanate coupling agent on the graphene oxide comprises physical adsorption and chemical modification. During chemical modification, titanate is inserted into a layered structure of graphene oxide, the layered structure of the graphene oxide is stripped and chemically grafted, and the number of layers of the titanate modified graphene oxide is thinned, so that the titanate modified graphene oxide is separated from unmodified graphene oxide under the action of gravity, and the upper layer slurry and the lower layer precipitate are separated in a standing or centrifugal mode to obtain the titanate modified graphene oxide slurry.
In the invention, when the solid content of the titanate modified graphene oxide slurry obtained by taking the upper layer slurry does not meet the requirement, the taken upper layer slurry is preferably continuously centrifuged, and the lower layer slurry is taken, so that the obtained slurry meets the solid content requirement.
The titanate modified graphene oxide slurry provided by the invention directly modifies graphene oxide under ultrasound by taking a titanate coupling agent as a modifying agent, improves the grafting efficiency of the graphene oxide and protects the intrinsic structure and performance of the graphene material. Meanwhile, toxic substances are not used in the process of preparing the titanate modified graphene oxide slurry, so that the method is green and environment-friendly and is beneficial to industrial production.
The invention also provides a lubricating oil composition, which comprises the titanate modified graphene oxide slurry and lubricating oil.
In the invention, the content of titanate modified graphene oxide in the lubricating oil composition is preferably 0.04-0.1 wt%, more preferably 0.05-0.09 wt%, and even more preferably 0.06-0.08 wt%. In the present invention, the lubricating oil preferably includes transmission oil, lubricating grease oil, gear oil, static hydraulic oil or antiwear hydraulic oil; the gear oil is preferably prepared by blending one or more of refined hydrogenated mineral oil 150N, refined hydrogenated mineral oil 500N, common mineral oil HVI400 and common mineral oil 150BS according to any proportion.
The invention also provides a preparation method of the lubricating oil composition in the technical scheme, which comprises the following steps:
and ultrasonically dispersing the titanate modified graphene oxide slurry and lubricating oil for 5-10 min under the power of 200-500W to obtain the lubricating oil composition.
In the invention, the power of ultrasonic dispersion is preferably 300-400W, and the time of ultrasonic dispersion is preferably 6-9 min.
In the invention, the power and time of ultrasonic dispersion can uniformly disperse the titanate-modified graphene oxide in the lubricating oil without agglomeration, and can effectively prevent the titanate-modified graphene oxide agglomerated substance from existing and failing to realize good settling property in the lubricating oil, thereby ensuring the dispersibility and stability of the final lubricating oil composition.
The titanate-modified graphene oxide slurry, the lubricating oil composition and the preparation method thereof provided by the present invention are described in detail below with reference to examples, but they should not be construed as limiting the scope of the present invention.
Example 1
Preparation of titanate modified graphene oxide slurry
Mixing 1g of graphene oxide with 100mL of monoalkoxyl titanate (JTW-101) at room temperature, placing the obtained mixture in an ultrasonic device, heating to 40 ℃, continuously performing ultrasonic dispersion for 4h, standing the obtained ultrasonic dispersion liquid for 24h, centrifuging the upper layer slurry for 5min at 8000r/min, taking the lower layer slurry, and collecting to obtain titanate modified graphene oxide slurry with the solid content of about 68%;
and washing and drying part of the titanate modified graphene oxide slurry to obtain the titanate modified graphene oxide.
Fig. 1 is a Raman spectrum of the titanate-modified graphene oxide and unmodified graphene oxide obtained in this example, and it can be seen from fig. 1 that: d peak (I) in modified graphene oxide Raman spectrum
D) And G peak (I)
G) The strength of the carbon material is obviously improved compared with that before modification, namely the disorder degree (S) of the carbon material is obviously improved. It can be known that the chaos degree of the modified carbon material is increased, and the integrity and regularity are reduced, which indicates that the titanate coupling agent is inserted into the multilayer graphene oxide lamella in the reaction process, and is combined with the oxygen-containing group to be successfully grafted to the graphene oxide surface, and the disorder degree is increased.
Fig. 2 is transmission electron microscope images of the titanate-modified graphene oxide obtained in this embodiment and unmodified graphene oxide at different magnifications, where a and c are transmission electron microscope images of the titanate-modified graphene oxide, and b and d are transmission electron microscope images of the unmodified graphene oxide. As can be seen from fig. 2: the multilayer graphene oxide has thicker lamella, folds on the surface and is in an aggregation state, while the titanate-modified graphene oxide shows a transparent and thin layered structure with fewer lamellae.
Fig. 3 is an XPS spectrum of the titanate-modified graphene oxide and unmodified graphene oxide obtained in this embodiment, where GO is unmodified graphene oxide, T-GO is titanate-modified cured graphene, and Ti2p is a titanium fine spectrum. As can be seen from fig. 3: c, O two elements exist in the surface of unmodified graphene oxide, and the surface of the modified graphene oxide also has titanium element besides the two elements, which can be seen from the fine spectrum of titanium; and the C/O of the unmodified graphene oxide is 2.82, the C/O of the modified graphene oxide is 5.17, and the great increase of the C, O ratio shows that a great amount of oxygen-containing functional groups in the modified graphene oxide are consumed, titanate reacts with the graphene oxide, and the titanate is successfully grafted to the surface of the graphene oxide.
As can be seen in fig. 1 to 3: the titanate is successfully grafted to the surface of the graphene oxide, and a large number of titanate long-chain groups are grafted between the sheets due to the modification of the titanate, so that the interlayer spacing of the sheets becomes large, the peeling is caused to be higher, and the sheets become thinner.
Preparing a titanate modified graphene oxide transmission oil composition:
mixing 13mg of titanate modified graphene oxide slurry with 20mL of transmission oil, and dispersing the obtained mixed oil in ultrasonic equipment for 30min to obtain the titanate modified graphene oxide transmission oil composition.
Example 2
Preparation of titanate modified graphene oxide slurry
Mixing 1g of graphene oxide with 100mL of monoalkoxyl titanate (JTW-101) at room temperature, placing the obtained mixed solution in an ultrasonic device, heating to 50 ℃, continuously performing ultrasonic dispersion for 4 hours, standing the obtained ultrasonic dispersion liquid for 24 hours, centrifuging the upper layer slurry for 5 minutes at 8000r/min, taking the lower layer slurry, and collecting to obtain titanate modified graphene oxide slurry with the solid content of 70%;
preparing a titanate modified graphene oxide lubricating grease oil composition:
and mixing 13mg of titanate modified graphene oxide slurry with 20mL of lubricating grease base oil, and placing the obtained mixed oil in ultrasonic equipment for ultrasonic dispersion for 30min to obtain the titanate modified graphene oxide lubricating grease oil composition.
Example 3
Preparation of titanate modified graphene oxide slurry
Mixing 1g of graphene oxide with 100mL of monoalkoxyl titanate (JTW-101) at room temperature, placing the obtained mixture in an ultrasonic device, heating to 60 ℃, continuously performing ultrasonic dispersion for 4h, standing the obtained ultrasonic dispersion liquid for 24h, centrifuging the upper layer slurry for 5min at 8000r/min, taking the lower layer slurry, and collecting to obtain titanate modified graphene oxide slurry with the solid content of 72%;
preparing a titanate modified graphene oxide gear oil composition:
and mixing 13mg of titanate modified graphene oxide slurry with 20mL of gear oil, and placing the obtained mixed oil in ultrasonic equipment for ultrasonic dispersion for 30min to obtain the titanate modified graphene oxide gear oil composition.
Example 4
Preparation of titanate modified graphene oxide slurry
Mixing 1g of graphene oxide with 100mL of monoalkoxyl titanate (JTW-101) at room temperature, placing the obtained mixture in an ultrasonic device, heating to 40 ℃, continuously performing ultrasonic dispersion for 4 hours, standing the obtained ultrasonic dispersion liquid for 24 hours, centrifuging the upper layer slurry for 5 minutes at 8000r/min, taking the lower layer slurry, and collecting to obtain titanate modified graphene oxide slurry with the solid content of 68%;
preparing a titanate modified graphene oxide hydrostatic oil composition:
and mixing 13mg of titanate modified graphene oxide slurry with 20mL of hydrostatic oil, and dispersing the obtained mixed oil in ultrasonic equipment at 200W for 30min to obtain the titanate modified graphene oxide hydrostatic oil composition.
Example 5
Preparation of titanate modified graphene oxide slurry
Mixing 1g of graphene oxide with 100mL of monoalkoxyl titanate (JTW-101) at room temperature, placing the obtained mixture in an ultrasonic device, heating to 40 ℃, continuously performing ultrasonic dispersion for 4 hours, standing the obtained ultrasonic dispersion liquid for 24 hours, centrifuging the upper layer slurry for 5 minutes at 8000r/min, taking the lower layer slurry, and collecting to obtain titanate modified graphene oxide slurry with the solid content of 68%;
the preparation method of the titanate modified graphene oxide anti-wear hydraulic oil composition comprises the following steps:
and mixing 13mg of titanate modified graphene oxide slurry with 20mL of antiwear hydraulic base oil, and placing the obtained mixed oil in ultrasonic equipment for ultrasonic dispersion for 30min to obtain the titanate modified graphene oxide antiwear hydraulic oil.
And (3) performance testing:
FIG. 4 is a graph showing the effect of the lubricating oil compositions obtained in examples 1 to 5, when left alone for 180 days, wherein: a. b, c, d and e are effect diagrams of the lubricating oil compositions obtained in examples 1 to 5 after standing for 180 days. As can be seen from fig. 4: the titanate modified graphene oxide does not settle after standing for 180 days in transmission oil, lubricating grease oil, gear oil, static hydraulic oil and anti-wear hydraulic oil, and the result shows that the graphene oxide is modified by titanate to show excellent stability in the transmission oil, the lubricating grease oil, the gear oil, the static hydraulic oil and the anti-wear hydraulic oil.
FIG. 5 is a graph showing the effects of the lubricating oil compositions obtained in examples 1 to 5, after standing at 120 ℃ for 30 days, wherein: a. b, c, d and e are graphs showing the effects of the lubricating oil compositions obtained in examples 1 to 5 after standing at 120 ℃ for 30 days. As can be seen from fig. 5: the titanate modified graphene oxide does not settle after standing for 30 days in transmission oil, lubricating grease oil, gear oil, static hydraulic oil and anti-wear hydraulic oil, and the titanate modified graphene oxide shows excellent high-temperature stability in the transmission oil, the lubricating grease oil, the gear oil, the static hydraulic oil and the anti-wear hydraulic oil after being modified by titanate.
Fig. 6 is a graph of a 1-day sedimentation effect of unmodified graphene oxide added to transmission oil, lubricating grease oil, gear oil, static hydraulic oil and anti-wear hydraulic oil, wherein (a), (b), (c), (d) and (e) represent the effects of unmodified graphene oxide added to the transmission oil, lubricating grease oil, gear oil, static hydraulic oil and anti-wear hydraulic oil respectively. As can be seen from fig. 6: the unmodified graphene oxide is added into the transmission oil, and obvious sedimentation occurs after 1 day; unmodified graphene oxide settles in grease oil, gear oil, hydrostatic oil, and hydrostatic oil over a period of 1 day.
FIG. 7 is a graph of wear scar on a friction pair after 2h lubrication with a static hydraulic fluid and the lubricating oil composition of example 4, wherein: a is a chart of the wear scar of a friction pair after hydrostatic oil lubrication for 2 hours, and b is a chart of the wear scar of the friction pair after the lubricating oil composition obtained in example 4 is lubricated for 2 hours. As can be seen from fig. 7: the static hydraulic oil added with the titanate modified graphene oxide has obviously reduced grinding spot diameter and grinding crack depth.
FIG. 8 is a plot of wear scar of a friction pair lubricated by an antiwear hydraulic oil and the lubricating oil composition obtained in example 5, where a is a plot of wear scar of a friction pair lubricated by an antiwear hydraulic oil and b is a plot of wear scar of a friction pair lubricated by the lubricating oil composition obtained in example 5. As can be seen from fig. 8: the wear-resistant hydraulic oil added with the titanate modified graphene oxide has obviously reduced wear-scar diameter and wear-scar depth.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The titanate-modified graphene oxide slurry is characterized by being prepared by ultrasonically dispersing graphene oxide and a titanate coupling agent and taking upper-layer slurry;
the solid content of the titanate modified graphene oxide slurry is not less than 60%.
2. The titanate-modified graphene oxide slurry according to claim 1, wherein the dosage ratio of the graphene oxide to the titanate coupling agent is 1-5 g: 100 mL.
3. The titanate-modified graphene oxide slurry according to claim 1 or 2, wherein the titanate coupling agent comprises a monoalkoxy titanate.
4. The titanate-modified graphene oxide slurry according to claim 1, wherein the temperature of the ultrasonic dispersion is 40-80 ℃ and the time is 4-8 hours.
5. The titanate-modified graphene oxide slurry according to claim 1, wherein the manner of taking the upper layer slurry comprises standing or centrifuging; the standing time is 24-36 h.
6. The titanate-modified graphene oxide slurry according to claim 5, wherein the rotation speed of the centrifugation is 8000 r/min.
7. A lubricating oil composition, characterized by comprising the titanate-modified graphene oxide slurry according to any one of claims 1 to 6 and a lubricating oil.
8. The lubricating oil composition of claim 7, wherein the titanate-modified graphene oxide is present in the lubricating oil composition in an amount of 0.04 to 0.1 wt.%.
9. The lubricating oil composition of claim 7 or 8, wherein the lubricating oil comprises transmission oil, grease oil, gear oil, hydrostatic oil, or antiwear hydraulic oil.
10. A method of making a lubricating oil composition of any of claims 7 to 9, comprising the steps of:
and ultrasonically dispersing the titanate modified graphene oxide slurry and lubricating oil for 5-10 min under the power of 200-500W to obtain the lubricating oil composition.
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