CN112899054B - Graphene-polymer nano composite water-based lubricating additive and preparation method and application thereof - Google Patents
Graphene-polymer nano composite water-based lubricating additive and preparation method and application thereof Download PDFInfo
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M125/00—Lubricating compositions characterised by the additive being an inorganic material
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M177/00—Special methods of preparation of lubricating compositions; Chemical modification by after-treatment of components or of the whole of a lubricating composition, not covered by other classes
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- 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
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- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2217/00—Organic macromolecular compounds containing nitrogen as ingredients in lubricant compositions
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- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2221/00—Organic macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
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Abstract
The invention provides a graphene-polymer nano composite water-based lubricating additive, and a preparation method and application thereof, and relates to the technical field of water-based lubricating additives. The graphene-polymer nano composite water-based lubricating additive provided by the invention has the effective components formed by non-covalent self-assembly compounding of graphene oxide and brush-type chitosan graft copolymer. In the invention, the brush-type chitosan graft copolymer can be assembled on the surface of graphene to form a non-covalent nano-composite by utilizing the hydrogen bond and electrostatic interaction between the brush-type chitosan graft copolymer and the oxygen-containing functional group on the surface of graphene oxide; the assembly of the brush-type chitosan graft copolymer can enhance the dispersion stability of graphene on one hand, and enhance the adsorption of the graphene on a friction interface and improve the stability of a carbon friction reaction film through the synergistic effect between the brush-type chitosan graft copolymer and the graphene on the other hand, so that the brush-type chitosan graft copolymer has excellent antifriction and antiwear performances.
Description
Technical Field
The invention relates to the technical field of water-based lubricating additives, in particular to a graphene-polymer nano composite water-based lubricating additive and a preparation method and application thereof.
Background
Friction and wear are among the main causes of failure of mechanical equipment and increased energy consumption, and lubrication is considered to be one of the most effective ways to save energy and extend the useful life of equipment. Conventional oil-based lubricants may form an oil film on the friction surfaces to avoid direct contact between the two sliding surfaces to reduce friction and wear. However, oil-based lubricants of petroleum origin are often limited due to their low flash point, flammability and low thermal conductivity properties, which make them unsuitable for use in special operating conditions where there is a risk of explosion and rapid heat dissipation is required. Also, due to the increasing severity of environmental problems and resource shortages, the use of water as a lubricating fluid has attracted extensive attention in the field of tribology in recent years. The water-based lubricant has the advantages of low cost, good environmental compatibility, no toxicity, high heat conductivity coefficient and the like. However, compared with oil-based lubricants, water has low viscosity, is easy to evaporate and corrode, and cannot form an oil film on the surface of a friction pair like oil to effectively reduce friction and wear, which greatly limits the application range of water as a lubricant. Therefore, there is a need to develop efficient water-based lubricant additives that improve the lubricity of water, reduce the coefficient of friction, and reduce wear.
Graphene is considered to be one of the nano additives with great development prospects due to its unique mechanical properties, electrical conductivity, high thermal conductivity and low surface energy. The addition of a small amount of graphene oxide in water can significantly reduce the coefficient of friction, but the strong van der waals and pi-pi interactions between graphene sheets cause them to easily agglomerate during shearing. Therefore, how to maintain the excellent tribological properties of graphene while improving the dispersibility of graphene in water is the key of using graphene as a water-based lubricant additive. For example, patent CN108130159A reports that a carboxylated graphene is covalently modified by using aminated polyethylene glycol, so as to obtain a graphene additive with good water dispersibility, and also significantly improve the tribological properties of graphene oxide. However, the preparation process of the modification method is complex, a plurality of toxic chemical reagents are needed, and covalent modification can destroy the conjugated structure of graphene to a certain extent and influence the tribological performance of graphene.
Disclosure of Invention
The invention aims to provide a graphene-polymer nano composite water-based lubricating additive, and a preparation method and application thereof.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a graphene-polymer nano composite water-based lubricating additive, which is prepared by compounding the effective components of graphene oxide and brush-type chitosan graft copolymer in a non-covalent self-assembly manner.
Preferably, the side chain of the brush-type chitosan graft copolymer is polyacrylamide, poly-N-isopropylacrylamide, poly-3-sulfopropyl methacrylate potassium salt or poly-sulfobetaine methacrylate.
Preferably, the mass ratio of chitosan to the polymerized monomer in the brush-type chitosan graft copolymer is 1: 5-20.
Preferably, the graphene oxide is flaky, and the thickness of a lamella is 0.8-5 nm.
Preferably, the mass ratio of the graphene oxide to the brush-type chitosan graft copolymer is 1: 0.1-5.
Preferably, the graphene-polymer nanocomposite water-based lubricant additive is an aqueous dispersion; the graphene oxide-polymer nano composite water-based lubricating additive comprises graphene oxide and a water dispersion liquid, wherein the concentration of the graphene oxide in the water dispersion liquid is 0.5-2 mg/mL.
The invention provides a preparation method of the graphene-polymer nano composite water-based lubricating additive in the technical scheme, which comprises the following steps:
and mixing the brush-type chitosan graft copolymer and the graphene oxide aqueous dispersion to obtain the graphene-polymer nano composite water-based lubricating additive.
Preferably, the mass concentration of the graphene oxide aqueous dispersion is 0.5-2 mg/mL.
Preferably, the mixing comprises stirring and sonication performed sequentially; the stirring time is 6-12 h; the ultrasonic time is 0.5-1 h.
The invention provides an application of the graphene-polymer nano composite water-based lubricating additive in the technical scheme or the graphene-polymer nano composite water-based lubricating additive prepared by the preparation method in the technical scheme in the water-based lubricating field.
The invention provides a graphene-polymer nano composite water-based lubricating additive, which is prepared by compounding the effective components of graphene oxide and brush-type chitosan graft copolymer in a non-covalent self-assembly manner. In the invention, the brush-type chitosan graft copolymer can be assembled on the surface of graphene to form a non-covalent nano-composite by utilizing the hydrogen bond and electrostatic interaction between the brush-type chitosan graft copolymer and the oxygen-containing functional group on the surface of graphene oxide; the assembly of the brush-type chitosan graft copolymer can enhance the dispersion stability of graphene on one hand, and enhance the adsorption of the graphene on a friction interface and improve the stability of a carbon friction reaction film through the synergistic effect between the brush-type chitosan graft copolymer and the graphene on the other hand, so that the brush-type chitosan graft copolymer has excellent antifriction and antiwear performances.
The invention also provides a preparation method of the graphene-polymer nano composite water-based lubricating additive, which has the advantages of simple preparation process and easy operation, and does not need any post-treatment and purification separation process after the preparation; the graphene-polymer nano composite water-based lubricating additive is environment-friendly and green, an organic solvent and a toxic chemical reagent are not used in the whole preparation process, and the adopted chitosan is a sustainable biological macromolecule.
The graphene-polymer nano composite water-based lubricating additive has excellent antifriction and antiwear performances and has wide application prospect in the field of water-based lubrication.
Drawings
FIG. 1 is an optical photograph of Graphene Oxide (GO) aqueous dispersion, Chitosan-grafted poly-N-isopropylacrylamide (Chitosan-g-PNIPAM) aqueous solution, and the GO/Chitosan-g-PNIPAM nanocomposite water-based lubricant additive prepared in example 1;
FIG. 2 is a plot of the coefficient of friction of pure water, aqueous GO dispersion, aqueous Chitosan-g-PNIPAM solution, and the GO/Chitosan-g-PNIPAM nanocomposite water-based lubricant additive prepared in example 1;
FIG. 3 is a schematic diagram of the synthesis of Chitosan-g-PNIPAM;
FIG. 4 is a schematic diagram of the preparation of GO/Chitosan-g-PNIPAM nanocomposite water-based lubricant additive.
Detailed Description
The invention provides a graphene-polymer nano composite water-based lubricating additive, which is prepared by compounding the effective components of graphene oxide and brush-type chitosan graft copolymer in a non-covalent self-assembly manner.
In the present invention, unless otherwise specified, the starting components used are all commercially available products well known to those skilled in the art.
In the present invention, the side chain of the brush-type chitosan graft copolymer is preferably polyacrylamide, poly-N-isopropylacrylamide, poly-3-sulfopropyl methacrylate potassium salt or poly-sulfobetaine. In the invention, the mass ratio of chitosan to the polymerized monomer in the brush-type chitosan graft copolymer is preferably 1: 5-20, and more preferably 1: 10-15. In the present invention, the deacetylation degree of chitosan in the brush-type chitosan graft copolymer is preferably greater than 70%, and the average molecular weight is preferably 1 to 100 ten thousand.
In the present invention, the preparation method of the brush-type chitosan graft copolymer preferably comprises the steps of: and (3) taking acetic acid aqueous solution as a solvent, ammonium persulfate as an initiator, and chitosan and a polymerization monomer to perform graft polymerization reaction to obtain the brush-type chitosan graft copolymer. In the present invention, the volume concentration of the aqueous acetic acid solution is preferably 1%; the dosage ratio of the chitosan to the acetic acid aqueous solution is preferably 0.1g: 20-60 mL, and more preferably 0.1g:40 mL; the mass ratio of the chitosan to the ammonium persulfate is preferably 1: 0.1-1, and more preferably 1: 0.5. In the present invention, the polymerized monomer is preferably acrylamide, N-isopropylacrylamide or sulfobetaine methacrylate or potassium 3-sulfopropyl methacrylate; the temperature of the graft polymerization reaction is preferably 45-80 ℃, and more preferably 60 ℃; the time of the graft polymerization reaction is preferably 6-15 h, and more preferably 12 h. In the present invention, the graft polymerization reaction is preferably carried out in a nitrogen atmosphere. In the invention, preferably, after the graft polymerization reaction, small molecular substances are removed by dialysis, concentrated and freeze-dried to obtain the brush-type chitosan graft copolymer. In the invention, in the process of the graft polymerization reaction, the amino group of the chitosan side chain generates a free radical to initiate monomer polymerization to form a graft copolymer taking chitosan as a main chain, and the graft copolymer is a brush type or comb type macromolecule.
In the invention, the brush-type chitosan graft copolymer can increase the stability of the graphene oxide, especially the stability of a formed tribochemical reaction film, and can enhance the adsorption effect of the graphene oxide on an interface; in addition, the brush-type chitosan graft copolymer plays a role in lubrication mainly through a hydration effect, and therefore, the brush-type chitosan graft copolymer and graphene oxide have a synergistic lubrication effect.
In the invention, the graphene oxide is preferably flaky, and the thickness of a lamella is preferably 0.8-5 nm, and more preferably 0.8-1.2 nm. In the invention, the diameter of the graphene oxide is preferably 0.5-5 micrometers. In the invention, after the brush-type chitosan grafted copolymer is assembled by graphene oxide, the morphology of graphene is basically not changed, and the graphene is still a nanosheet.
In the invention, the mass ratio of the graphene oxide to the brush-type chitosan graft copolymer is preferably 1: 0.1-5, and more preferably 1: 0.2-1.
In the present invention, the graphene-polymer nanocomposite water-based lubricant additive is preferably an aqueous dispersion; the concentration of the graphene oxide in the aqueous dispersion liquid is preferably 0.5-2 mg/mL, and more preferably 1-1.5 mg/mL, based on the mass of the graphene oxide in the graphene-polymer nano composite water-based lubricating additive.
The invention also provides a preparation method of the graphene-polymer nano composite water-based lubricant additive in the technical scheme, which comprises the following steps:
and mixing the brush-type chitosan graft copolymer and the graphene oxide aqueous dispersion to obtain the graphene-polymer nano composite water-based lubricating additive.
In the present invention, the specific composition and structure of the brush-type chitosan graft copolymer and graphene oxide are the same as those described above, and are not described herein again.
In the invention, the mass concentration of the graphene oxide aqueous dispersion liquid is preferably 0.5-2 mg/mL, and more preferably 1-1.5 mg/mL. In the present invention, the mixing preferably includes stirring and sonication performed sequentially; the stirring time is preferably 6-12 h, and more preferably 8-10 h; the ultrasonic time is preferably 0.5-1 h. In the present invention, the mixing is preferably performed at room temperature. The invention has no special requirements on the stirring speed and the ultrasonic power, and the stirring speed and the ultrasonic power which are conventional by the technicians in the field can be adopted. According to the invention, the graphene oxide is better dispersed by stirring and ultrasonic, and the assembly of the brush-type chitosan graft copolymer on the surface of the graphene oxide is accelerated.
The graphene-polymer nano composite water-based lubricating additive prepared by the invention has good dispersion stability, and no precipitate or insoluble substances are separated after standing for 30 days at room temperature.
The invention also provides the application of the graphene-polymer nano composite water-based lubricating additive in the technical scheme or the graphene-polymer nano composite water-based lubricating additive prepared by the preparation method in the technical scheme in the water-based lubricating field. The graphene-polymer nano composite water-based lubricating additive provided by the invention has good dispersion stability, stable friction coefficient and excellent antifriction and antiwear performances. The graphene-polymer nano composite water-based lubricating additive is directly used as a lubricant without any post-treatment and purification separation process.
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Preparing a graphene-Chitosan grafted poly N-isopropylacrylamide (GO/Chitosan-g-PNIPAM) nano composite water-based lubricating additive:
(1) synthesis of Chitosan-g-PNIPAM: weighing 0.1g of chitosan, adding 40mL of acetic acid solution with volume fraction of 1% into a beaker, and stirring to completely dissolve the chitosan; then pouring the solution into a three-neck flask, heating to 60 ℃, and adding 0.05g of ammonium persulfate under the protection of nitrogen; weighing 1.0g N-isopropyl acrylamide monomer after 25min, dissolving in 10mL distilled water, adding into a three-neck flask, carrying out graft polymerization for 12h, removing unreacted monomer, initiator and other low molecular weight substances by using a dialysis bag, and freeze-drying to obtain white flaky solid, namely brush-type Chitosan graft copolymer Chitosan-g-PNIPAM; the synthesis schematic diagram of Chitosan-g-PNIPAM is shown in FIG. 3;
(2) preparing a GO/Chitosan-g-PNIPAM nano composite water-based lubricating additive: taking 10mL of Graphene Oxide (GO) water dispersion of 1mg/mL, adding 2mg of Chitosan-g-PNIPAM into the graphene oxide water dispersion, stirring the mixed dispersion for 6 hours, and then carrying out ultrasonic treatment for 30min to uniformly disperse the dispersion to obtain the GO/Chitosan-g-PNIPAM nano composite water-based lubricating additive; a schematic diagram of the preparation of the GO/Chitosan-g-PNIPAM nanocomposite water-based lubricant additive is shown in FIG. 4.
The GO/Chitosan-g-PNIPAM nano composite water-based lubricating additive prepared by the embodiment has good stability, and no precipitate or precipitate appears after standing for 30 days, and a specific photo is shown in figure 1.
The friction performance evaluation of the GO/Chitosan-g-PNIPAM nano composite water-based lubricating additive is as follows: the friction performance evaluation was carried out using SRV-IV micro-vibration friction wear tester from optimol grease, germany, under the friction test conditions: the load is 100N, the temperature is 25 ℃, the frequency is 25Hz, the amplitude is 1mm, the test time is 30min, and the friction couple is a common steel ball with the diameter of 10mm and a 316L stainless steel substrate. The average friction coefficient is shown in Table 1, and the friction coefficient curve is shown in FIG. 2, wherein "GO" in FIG. 2 represents GO water dispersion with concentration of 1mg/mL, and "Chitosan-g-PNIPAM" represents Chitosan-g-PNIPAM water solution with concentration of 1 mg/mL.
The wear rate of the GO/Chitosan-g-PNIPAM nano composite water-based lubricant additive is tested, the result is shown in the table 1, and the test method of the wear rate is as follows: the wear rate of the 316L stainless steel substrate was measured and calculated using an AEP corporation, us, non-contact, three-dimensional surface profiler.
TABLE 1 average coefficient of friction and wear rate for pure water, GO, Chitosan-g-PNIPAM and GO/Chitosan-g-PNIPAM
As can be seen from Table 1 and FIG. 2, the GO/Chitosan-g-PNIPAM nanocomposite water-based lubricant additive has a lower and more stable coefficient of friction and wear rate than pure water, GO water dispersion, and Chitosan-g-PNIPAM aqueous solution.
Example 2
Preparing a graphene-Chitosan grafted polymethacrylic acid betaine (GO/Chitosan-g-PSBMA) nano composite water-based lubricating additive:
(1) synthesis of Chitosan-g-PSBMA: weighing 0.1g of chitosan, adding 40mL of acetic acid solution with volume fraction of 1% into a beaker, and stirring to completely dissolve the chitosan; then pouring the solution into a three-neck flask, heating to 60 ℃, and adding 0.05g of ammonium persulfate under the protection of nitrogen; after 25min, weighing 1.0g of methacrylic acid sulfonic acid betaine monomer, dissolving in 10mL of distilled water, adding into a three-necked flask, carrying out graft polymerization for 12h, removing unreacted monomer, initiator and other low molecular weight substances by using a dialysis bag, and freeze-drying to obtain a white flaky solid, namely brush-type Chitosan graft copolymer Chitosan-g-PSBMA;
(2) preparing a GO/Chitosan-g-PSBMA nano composite water-based lubricating additive: and (2) adding 2mg of Chitosan-g-PSBMA into 10mL of 1mg/mL GO water dispersion, stirring the mixed dispersion for 6 hours, and then carrying out ultrasonic treatment for 30min to uniformly disperse the dispersion to obtain the GO/Chitosan-g-PSBMA nano composite water-based lubricating additive.
The friction performance of the GO/Chitosan-g-PSBMA nano composite water-based lubricating additive is detected according to the friction performance evaluation method in the embodiment 1, the result is shown in the table 2, and the GO/Chitosan-g-PSBMA nano composite water-based lubricating additive has lower friction coefficient and wear rate compared with pure water and a Chitosan-g-PSBMA water solution.
Example 3
Preparing a graphene-Chitosan grafted polymethyl methacrylate 3-propyl sulfonate potassium salt (GO/Chitosan-g-PSPMA) nano composite water-based lubricating additive:
(1) synthesis of Chitosan-g-PSPMA: weighing 0.1g of chitosan, adding 40mL of acetic acid solution with volume fraction of 1% into a beaker, and stirring to completely dissolve the chitosan; then pouring the solution into a three-neck flask, heating to 60 ℃, and adding 0.05g of ammonium persulfate under the protection of nitrogen; after 25min, weighing 1.0g of 3-sulfopropyl methacrylate potassium salt monomer, dissolving the monomer in 10mL of distilled water, adding the solution into a three-necked flask, carrying out graft polymerization for 12h, removing unreacted monomer, initiator and other low molecular weight substances by using a dialysis bag, and freeze-drying to obtain a white flaky solid, namely brush-type Chitosan graft copolymer Chitosan-g-PSPMA;
(2) preparing a GO/Chitosan-g-PSPMA nano composite water-based lubricating additive: taking 10mL of 1mg/mL GO water dispersion, adding 2mg of Chitosan-g-PSPMA into the GO water dispersion, stirring the mixed dispersion for 6 hours, and then carrying out ultrasonic treatment for 30min to uniformly disperse the mixture to obtain the GO/Chitosan-g-PSPMA nano composite water-based lubricating additive.
The friction performance of the GO/Chitosan-g-PSPMA nano composite water-based lubricant additive is detected according to the friction performance evaluation method in the embodiment 1, the result is shown in Table 2, and the GO/Chitosan-g-PSPMA nano composite water-based lubricant additive has lower friction coefficient and wear rate compared with pure water and a Chitosan-g-PSPMA water solution.
TABLE 2 average coefficient of friction for different graphene-polymer nanocomposite water-based lubricant additives
Example 4
The preparation method is basically the same as that of the example 1, except that the adding amount of the Chitosan-g-PNIPAM is adjusted from 2mg to 1mg when the GO/Chitosan-g-PNIPAM nano composite water-based lubricating additive is prepared; the friction properties of the obtained GO/Chitosan-g-PNIPAM nanocomposite water-based lubricant additive are shown in Table 3.
Example 5
The preparation method is basically the same as that of the example 1, except that the adding amount of the Chitosan-g-PNIPAM is adjusted from 2mg to 10mg when the GO/Chitosan-g-PNIPAM nano composite water-based lubricating additive is prepared; the friction properties of the obtained GO/Chitosan-g-PNIPAM nanocomposite water-based lubricant additive are shown in Table 3.
Example 6
The preparation method is basically the same as that of the example 1, except that the adding amount of the Chitosan-g-PNIPAM is adjusted from 2mg to 50mg when the GO/Chitosan-g-PNIPAM nano composite water-based lubricating additive is prepared; the friction properties of the obtained GO/Chitosan-g-PNIPAM nanocomposite water-based lubricant additive are shown in table 3.
TABLE 3 average Friction coefficient of GO/Chitosan-g-PNIPAM of different mass ratios
As can be seen from table 3, when the mass ratio of the graphene oxide to the brush-type chitosan graft copolymer is 1: when the friction coefficient of the GO/Chitosan-g-PNIPAM nano composite water-based lubricating additive is 0.1-5, the obtained GO/Chitosan-g-PNIPAM nano composite water-based lubricating additive has a low friction coefficient and excellent friction reduction and wear resistance.
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 (9)
1. A graphene-polymer nano composite water-based lubricating additive is characterized in that the effective component is formed by non-covalent self-assembly compounding of graphene oxide and brush type chitosan graft copolymer;
the side chain of the brush type chitosan graft copolymer is polyacrylamide, poly N-isopropyl acrylamide, poly 3-sulfopropyl methacrylate sylvite or poly sulfobetaine methacrylate.
2. The graphene-polymer nanocomposite water-based lubricating additive as claimed in claim 1, wherein the mass ratio of chitosan to polymerized monomer in the brush-type chitosan graft copolymer is 1: 5-20.
3. The graphene-polymer nanocomposite water-based lubricant additive of claim 1, wherein the graphene oxide is in a sheet shape and has a sheet thickness of 0.8 to 5 nm.
4. The graphene-polymer nanocomposite water-based lubricating additive as claimed in claim 1, wherein the mass ratio of the graphene oxide to the brush-type chitosan graft copolymer is 1: 0.1-5.
5. The graphene-polymer nanocomposite water-based lubricating additive of claim 4, wherein the graphene-polymer nanocomposite water-based lubricating additive is an aqueous dispersion; the graphene oxide-polymer nano composite water-based lubricating additive comprises graphene oxide and a water dispersion liquid, wherein the concentration of the graphene oxide in the water dispersion liquid is 0.5-2 mg/mL.
6. A method of preparing the graphene-polymer nanocomposite water-based lubricant additive of any one of claims 1 to 5, comprising the steps of:
and mixing the brush-type chitosan graft copolymer and the graphene oxide aqueous dispersion to obtain the graphene-polymer nano composite water-based lubricating additive.
7. The preparation method according to claim 6, wherein the mass concentration of the graphene oxide aqueous dispersion is 0.5-2 mg/mL.
8. The method of claim 6, wherein the mixing comprises stirring and sonication performed sequentially; the stirring time is 6-12 h; the ultrasonic time is 0.5-1 h.
9. The graphene-polymer nanocomposite water-based lubricant additive as defined in any one of claims 1 to 5 or the graphene-polymer nanocomposite water-based lubricant additive prepared by the preparation method as defined in any one of claims 6 to 8 is applied to the field of water-based lubrication.
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