CN113652292A - Preparation method of microemulsion cutting fluid for machining aluminum alloy of aircraft engine - Google Patents
Preparation method of microemulsion cutting fluid for machining aluminum alloy of aircraft engine Download PDFInfo
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- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
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- C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
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- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/02—Hydroxy compounds
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- C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
- C10M2209/10—Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
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- C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
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- C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
- C10M2219/04—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions containing sulfur-to-oxygen bonds, i.e. sulfones, sulfoxides
- C10M2219/044—Sulfonic acids, Derivatives thereof, e.g. neutral salts
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- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
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Abstract
The invention provides a preparation method of a micro-emulsion cutting fluid for processing an aluminum alloy of an aeroengine, which comprises the steps of pre-reducing graphene oxide, sulfonating, and reducing residual oxygen functional groups by hydrazine hydrate to obtain sulfonated graphene; dispersing sulfonated graphene into a dispersion liquid; adding molybdenum salt and sulfur powder into a mixed solution of hydrazine hydrate and N, N-dimethylformamide, adding the mixed solution into sulfonated graphene dispersion liquid, adding hydrogen peroxide, centrifuging, washing, and freeze-drying to obtain sulfonated graphene/MoS2A nanocage; ball milling, adding into ethylene glycol, adding dimethyl sulfate and sodium dodecyl sulfate, stirring, and performing ultrasonic treatment; adding an emulsifier, triethanolamine, polyethylene wax, a compound surfactant, an antirust agent and a defoaming agent into biodegradable base oil to obtain an oil-based mixed solution; taking deionized water, adding sulfonated graphene/MoS into the deionized water2Obtaining a water-based mixed solution by using the nano cage, glycerol and propylene glycol; mixing the oil-water base mixed solution, and stirring until the liquid is uniformAnd (4) uniformly and transparently obtaining the micro-emulsified cutting fluid for processing the aluminum alloy of the aero-engine.
Description
Technical Field
The invention relates to the technical field of cutting fluid, and particularly relates to a preparation method of a micro-emulsion cutting fluid for machining an aluminum alloy of an aero-engine.
Background
Cutting is the most important processing method in machine manufacturing, and a proper amount of cutting fluid needs to be added between a cutter and a workpiece in the cutting process to play various functions of cooling, lubricating, rust prevention, cleaning and the like. In particular, the cooling performance and the lubricating performance of the cutting fluid used for metal cutting determine the service life of the cutting tool and the cutting effect of the surface of a workpiece.
In the 50 s of the 20 th century, the fully synthetic metal working fluid appeared on the market for the first time. Compared with emulsion, the fully synthetic processing liquid has better cooling property and rust resistance, and better hard water stability and biological stability in processing, thereby bringing longer service life; but the lubricating property of the oil is not as good as that of emulsion, and the oil is difficult to adapt to heavy-load processing.
The microemulsion is a novel cutting fluid between emulsion and synthetic fluid, is a new generation product of water-based cutting fluid after the emulsion cutting fluid and the synthetic cutting fluid are emulsified, and is microemulsion and semitransparent liquid formed by diluting microemulsion oil with water at high times. The microemulsion overcomes the defects of easy putrefaction and poor cleaning performance of emulsion, corrosion of paint surface of a machine tool by synthetic cutting fluid, poor lubricating performance and the like, avoids the defects of oil pollution, mildewing and deterioration and the like, integrates the advantages of the emulsion and the synthetic fluid, has double oily and aqueous extreme pressure, lubricating, cooling, antirust and cleaning capabilities, and is a new generation of ideal machine-processing lubricating and cooling medium.
Molybdenum disulfide is added into the cutting fluid, so that the cutting fluid has better lubricating property, but researches show that the molybdenum disulfide is easily carbonized and loses efficacy at high temperature, so that the lubricating property of the cutting fluid is lost at high temperature, the service life of a cutter is prolonged, and the cutting effect of the surface of a workpiece is reduced. In addition, the cutting fluid is oil-based cutting fluid, the cooling performance is poor, and heat on a cutter and a workpiece is not easy to dissipate during cutting, so that the cutting tool is required to have higher high temperature resistance, and the service life of the cutting tool is greatly shortened. Therefore, in order to overcome the defects that the conventional cutting fluid is easy to lose the lubricity and the self-cooling performance when being used for cutting metal, the invention of the high-quality cutting fluid for solving the technical problems is a technical problem to be solved.
Therefore, the preparation method of the microemulsion cutting fluid for machining the aluminum alloy of the aero-engine is provided. The preparation of sulfonated graphene @ molybdenum disulfide nanocages based on a reductive sulfur solution and an oxidized sulfonated graphene dispersion was developed for the first time through a template-free self-sealing method. According to the invention, the sulfonated graphene is compounded with the molybdenum disulfide, and the sulfonated graphene is coated on the surface of the molybdenum disulfide, so that the molybdenum disulfide is not easily carbonized at high temperature, the molybdenum disulfide keeps better lubricity, and the reduction of the service life of a cutter due to the influence of high temperature in the metal cutting process can be effectively avoided; meanwhile, the cutting and disinfecting liquid is water-oil-based mixed and sulfonated graphene has good thermal conductivity, so that the cooling performance of the cutting and disinfecting liquid is improved.
Disclosure of Invention
The invention aims to provide a preparation method of a micro-emulsion cutting fluid for machining an aluminum alloy of an aircraft engine. The sulfonated graphene @ molybdenum disulfide nanocage is prepared on the basis of a reducing sulfur solution and an oxidized sulfonated graphene dispersion body, so that molybdenum disulfide and sulfonated graphene are combined through chemical bonds and are completely coated by the sulfonated graphene, and the molybdenum disulfide is not easily carbonized at high temperature and keeps good lubricity; the digestion solution is water-oil-based mixture, and the sulfonated graphene has better thermal conductivity, so that the cooling performance of the sulfonated graphene is improved.
In order to achieve the purpose, the invention provides the following technical scheme: a method for preparing microemulsion cutting fluid for processing aluminum alloy of an aeroengine comprises the following steps,
1) preparing sulfonated graphene: (1) pre-reducing graphene oxide: weighing graphene oxide, dissolving the graphene oxide in deionized water, and performing ultrasonic dispersion for 2-3 hours to form a brown dispersion solution; regulating the pH value to 9-10 by using a carbonate solution, and slowly adding sodium borohydride into the carbonate solution at the temperature of 60-80 ℃ and stirring for 1-3 hours; then, re-dispersing the partially reduced graphene oxide into deionized water, and centrifuging and washing with the deionized water for 3-5 times to enable the pH value to be neutral 7; (2) sulfonation: dissolving ammonium sulfonate and nitrate in a hydrochloric acid solution, wherein the mass ratio of the ammonium sulfonate to the nitrate is 23: 9, slowly adding the mixture into the dispersion solution with the pH value of 7 in the step (1), and magnetically stirring for 4-6 hours under the ice bath condition; dispersing the product into deionized water again for dispersion, and then centrifuging and washing with deionized water for 3-5 times; (3) hydrazine hydrate reduces the remaining oxygen functional groups: adding hydrazine hydrate into the dispersion liquid obtained in the step (2), magnetically stirring for 24-36 hours at 100 ℃, and then centrifuging and washing with deionized water for 3-5 times to obtain sulfonated graphene;
2) sulfonated graphene/MoS2Preparation of nanocages: dispersing sulfonated graphene into deionized water, and performing ultrasonic treatment for 2-3 hours to form a uniform dispersion liquid; adding soluble molybdenum salt and sulfur powder into hydrazine hydrate and N, N-dimethylformamide to form a brown mixed solution, wherein the volume ratio of the hydrazine hydrate to the N, N-dimethylformamide is 1: 1, dropwise adding the brown mixed solution into sulfonated graphene dispersion liquid under the condition of stirring rotating speed of 10000-15000 revs/min, simultaneously adding hydrogen peroxide, centrifuging the obtained product, washing the product with deionized water for 3-5 times, and freeze-drying the product for 12-24 hours to finally form sulfonated graphene/MoS2A nanocage;
3) ball-milled sulfonated graphene/MoS2Nano cage: the sulfonated graphene/MoS obtained in the step 2) is used2Putting the nano cage into a ball mill, ball-milling for 2-3 h at the rotating speed of 1200-1500 r/min, and then carrying out ball-milling on the sulfonated graphene/MoS2Putting a nano cage into ethylene glycol with the weight 4-6 times of that of the nano cage, adding 2-3 parts of dimethyl sulfate and 1-2 parts of sodium dodecyl sulfate, uniformly stirring, and carrying out ultrasonic treatment for 20-25 min for later use, wherein the ultrasonic frequency is 240-360 kHz;
4) preparing oil-based mixed liquid: taking 25-28 parts by weight of biodegradable base oil, adding 6-8 parts of OP-10NP emulsifier, uniformly stirring, adding 3-4 parts of triethanolamine, 2-4 parts of polyethylene wax, 2-3 parts of compound surfactant, 1-3 parts of barium petroleum sulfonate antirust agent and 1-2 parts of polyether defoaming agent, and uniformly stirring for later use;
5) preparing a water-based mixed solution: taking 110-135 parts by weight of deionized water, and adding 26-34 parts of sulfonated graphene/MoS obtained in step 2)2Uniformly stirring a nano cage, 6-9 parts of glycerol and 3-5 parts of propylene glycol for later use;
6) preparing a micro-emulsion cutting fluid: and (3) mixing the oil-based mixed solution and the water-based mixed solution obtained in the steps (4) and (5), and stirring at the rotating speed of 720-850 r/min until the liquid is uniform and transparent to obtain the micro-emulsified cutting fluid for processing the aluminum alloy.
Preferably, in the step 1), the carbonate is one or a combination of sodium carbonate, potassium carbonate and lithium carbonate; the nitrate is one or the combination of sodium nitrate, potassium nitrate or lithium nitrate; the mass concentration of the hydrogen peroxide is 0.6-1 wt%.
Preferably, in the step 2), the molybdenum salt is one or a combination of molybdenum acetate, molybdenum citrate or molybdenum chloride.
Preferably, in the step 4), the biodegradable base oil is prepared from palm oil, rapeseed oil and soybean oil according to a volume ratio of 1: 2-3: 3-6 mixing; the compound surfactant is prepared from tween 20 and fatty alcohol ether sodium sulfate according to the mass fraction of 5: 2-4.
Compared with the prior art, the invention has the following beneficial effects:
the sulfonated graphene @ molybdenum disulfide nanocage is added into the cutting fluid provided by the invention, and the lubricating property and the cooling property of the cutting fluid are improved by adopting a water-oil-based mixing mode. The sulfonated graphene @ molybdenum disulfide nanocage is prepared on the basis of a reducing sulfur solution and an oxidized sulfonated graphene dispersion body, so that molybdenum disulfide and sulfonated graphene are combined through chemical bonds and are completely coated by the sulfonated graphene, and the molybdenum disulfide is not easily carbonized at high temperature and keeps good lubricity; the digestion solution is water-oil-based mixture, and the sulfonated graphene has better thermal conductivity, so that the cooling performance of the sulfonated graphene is improved.
Drawings
FIG. 1 is an SEM picture of microemulsion cutting fluid for machining aluminum alloy of an aeroengine in example 1
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
The first embodiment is as follows:
1) preparing sulfonated graphene: (1) pre-reducing graphene oxide: weighing 750mg of graphene oxide, dissolving in deionized water, and performing ultrasonic dispersion for 2 hours to form a brown dispersion solution; regulating the pH value to 9 by using a sodium carbonate solution, slowly adding sodium borohydride into the sodium carbonate solution at the temperature of 60 ℃, and stirring for 1 hour; then, re-dispersing the partially reduced graphene oxide into deionized water, and centrifuging and washing the graphene oxide with the deionized water for 5 times to enable the pH value to be neutral 7; (2) sulfonation: dissolving 1.38g of amine sulfonate and 0.54g of lithium nitrate in a hydrochloric acid solution, slowly adding the mixture into the dispersion solution with the pH value of 7 in the step (1), and magnetically stirring for 6 hours under ice bath conditions; dispersing the product into deionized water again for dispersion, and then centrifuging and washing with deionized water for 3 times; (3) hydrazine hydrate reduces the remaining oxygen functional groups: adding hydrazine hydrate into the dispersion liquid obtained in the step (2), magnetically stirring for 24 hours at the temperature of 100 ℃, and then centrifuging and washing with deionized water for 5 times to obtain sulfonated graphene;
2) sulfonated graphene/MoS2Preparation of nanocages: dispersing sulfonated graphene into deionized water, and performing ultrasonic treatment for 3 hours to form uniform dispersion liquid; adding soluble molybdenum nitrate and sulfur powder into hydrazine hydrate and N, N-dimethylformamide to form brown mixed liquor, wherein the volume ratio of the hydrazine hydrate to the N, N-dimethylformamide is 1: 1, dropwise adding the brown mixed solution into the sulfonated graphene dispersion liquid under the condition of stirring rotation speed of (10000revs/min), simultaneously adding hydrogen peroxide with the mass concentration of 0.6 wt%, centrifuging the obtained product, washing the product with deionized water for 5 times, and freeze-drying the product for 12 hours to finally form sulfonated graphene/MoS2A nanocage;
3) ball-milled sulfonated graphene/MoS2Nano cage: the sulfonated graphene/MoS obtained in the step 2) is used2Putting the nano cage into a ball mill, ball-milling for 2h at the rotating speed of 1200r/min, and then carrying out ball-milling on the sulfonated graphene/MoS2Putting the nano cage into ethylene glycol with the weight 4 times of that of the nano cage, adding 2 parts of dimethyl sulfate and 1 part of sodium dodecyl sulfate, uniformly stirring, and carrying out ultrasonic treatment for 20min for later use, wherein the ultrasonic frequency is 240 kHz;
4) preparing oil-based mixed liquid: taking a mixture of 25 parts by weight of palm oil, rapeseed oil and soybean oil, wherein the volume ratio of the palm oil, the rapeseed oil and the soybean oil is 1: 2: 3, adding 6 parts of OP-10NP emulsifier, uniformly stirring, then adding 3 parts of triethanolamine, 2 parts of polyethylene wax, 2 parts of compound surfactant Tween 20 and fatty alcohol ether sodium sulfate (the mass ratio of the two is 5: 2), 1 part of barium petroleum sulfonate antirust agent and 1 part of polyether defoamer, and uniformly stirring for later use;
5) preparing a water-based mixed solution: taking 110 parts by weight of deionized water, and adding 26 parts of sulfonated graphene/MoS obtained in the step 2)2Uniformly stirring a nano cage, 6 parts of glycerol and 3 parts of propylene glycol for later use;
6) preparing a micro-emulsion cutting fluid: and (3) mixing the oil-based mixed solution and the water-based mixed solution obtained in the steps (4) and (5), and stirring at the rotating speed of 720r/min until the liquid is uniform and transparent to obtain the micro-emulsified cutting fluid for processing the aluminum alloy.
Example two:
1) preparing sulfonated graphene: (1) pre-reducing graphene oxide: weighing 750mg of graphene oxide, dissolving in deionized water, and performing ultrasonic dispersion for 3 hours to form a brown dispersion solution; adjusting the pH value to 9.4 by using a sodium carbonate solution, slowly adding sodium borohydride into the sodium carbonate solution at the temperature of 80 ℃, and stirring the mixture for 2 hours; then, re-dispersing the partially reduced graphene oxide into deionized water, and centrifuging and washing the graphene oxide with the deionized water for 3 times to enable the pH value to be neutral 7; (2) sulfonation: dissolving 0.69g of amine sulfonate and 0.27g of potassium nitrate in a hydrochloric acid solution, slowly adding the mixture into the dispersion solution with the pH value of 7 in the step (1), and magnetically stirring for 5 hours under ice bath conditions; dispersing the product into deionized water again for dispersion, and then centrifuging and washing with deionized water for 3 times; (3) hydrazine hydrate reduces the remaining oxygen functional groups: adding hydrazine hydrate into the dispersion liquid obtained in the step (2), magnetically stirring for 24 hours at the temperature of 100 ℃, and then centrifuging and washing for 3 times by using deionized water to obtain sulfonated graphene;
2) sulfonated graphene/MoS2Preparation of nanocages: dispersing sulfonated graphene into deionized water, and performing ultrasonic treatment for 2 hours to form uniform dispersion liquid; adding soluble molybdenum citrate and sulfur powder into hydrazine hydrate and N, N-dimethylformamide to form a brown mixed solution, wherein the volume ratio of the hydrazine hydrate to the N, N-dimethylformamide is 1: 1, dropwise adding the brown mixed solution into the sulfonated graphene dispersion liquid under the condition of stirring rotation speed of 12000revs/min, and simultaneously adding the mass concentrationHydrogen peroxide with the concentration of 1 wt%, centrifuging the obtained product, washing the product for 3 times by using deionized water, and freeze-drying the product for 24 hours to finally form sulfonated graphene/MoS2A nanocage.
3) Ball-milled sulfonated graphene/MoS2Nano cage: the sulfonated graphene/MoS obtained in the step 2) is used2Putting the nano cage into a ball mill, ball-milling for 2h at the rotating speed of 1500r/min, and then carrying out ball-milling on the sulfonated graphene/MoS2Putting the nano cage into glycol with the weight 5 times of that of the nano cage, adding 3 parts of dimethyl sulfate and 2 parts of sodium dodecyl sulfate, uniformly stirring, and carrying out ultrasonic treatment for 20min for later use, wherein the ultrasonic frequency is 260 kHz;
4) preparing oil-based mixed liquid: taking a mixture of 25 parts by weight of palm oil, rapeseed oil and soybean oil, wherein the volume ratio of the palm oil, the rapeseed oil and the soybean oil is 1: 3: 6, adding 6 parts of OP-10NP emulsifier, uniformly stirring, then adding 3 parts of triethanolamine, 3 parts of polyethylene wax, 3 parts of compound surfactant Tween 20 and fatty alcohol ether sodium sulfate (the mass ratio of the two is 5: 2), 2 parts of barium petroleum sulfonate antirust agent and 2 parts of polyether defoamer, and uniformly stirring for later use;
5) preparing a water-based mixed solution: 120 parts by weight of deionized water is taken, and 30 parts of sulfonated graphene/MoS obtained in the step 2) is added into the deionized water2Uniformly stirring a nano cage, 8 parts of glycerol and 5 parts of propylene glycol for later use;
6) preparing a micro-emulsion cutting fluid: and (3) mixing the oil-based mixed solution and the water-based mixed solution obtained in the steps (4) and (5), and stirring at the rotating speed of 800r/min until the liquid is uniform and transparent to obtain the micro-emulsified cutting fluid for processing the aluminum alloy.
Example 3
1) Preparing sulfonated graphene: (1) pre-reducing graphene oxide: weighing 750mg of graphene oxide, dissolving in deionized water, and performing ultrasonic dispersion for 3 hours to form a brown dispersion solution; regulating the pH value to 9 by using a lithium carbonate solution, and slowly adding sodium borohydride into the lithium carbonate solution at the temperature of 80 ℃ and stirring the mixture for 1 hour; then, re-dispersing the partially reduced graphene oxide into deionized water, and centrifuging and washing the graphene oxide with the deionized water for 3 times to enable the pH value to be neutral 7; (2) sulfonation: dissolving 2.76g of amine sulfonate and 1.08g of lithium nitrate in a hydrochloric acid solution, slowly adding the mixture into the dispersion solution with the pH value of 7 in the step (1), and magnetically stirring for 5 hours under ice bath conditions; dispersing the product into deionized water again for dispersion, and then centrifuging and washing with deionized water for 3 times; (3) hydrazine hydrate reduces the remaining oxygen functional groups: adding hydrazine hydrate into the dispersion liquid obtained in the step (2), magnetically stirring for 24 hours at the temperature of 100 ℃, and then centrifuging and washing for 3 times by using deionized water to obtain sulfonated graphene;
2) sulfonated graphene/MoS2Preparation of nanocages: dispersing sulfonated graphene into deionized water, and performing ultrasonic treatment for 2 hours to form uniform dispersion liquid; adding soluble molybdenum chloride and sulfur powder into hydrazine hydrate and N, N-dimethylformamide to form brown mixed liquor, wherein the volume ratio of the hydrazine hydrate to the N, N-dimethylformamide is 1: 1, dropwise adding the brown mixed solution into the sulfonated graphene dispersion liquid under the condition of stirring rotation speed (15000revs/min), simultaneously adding hydrogen peroxide with the mass concentration of 1 wt%, centrifuging the obtained product, washing the product with deionized water for 3 times, and freeze-drying the product for 24 hours to finally form sulfonated graphene/MoS2A nanocage.
3) Ball-milled sulfonated graphene/MoS2Nano cage: the sulfonated graphene/MoS obtained in the step 2) is used2Putting the nano cage into a ball mill, ball-milling for 2h at the rotating speed of 1500r/min, and then carrying out ball-milling on the sulfonated graphene/MoS2Putting the nano cage into ethylene glycol with the weight 6 times of that of the nano cage, adding 2 parts of dimethyl sulfate and 2 parts of sodium dodecyl sulfate, uniformly stirring, and carrying out ultrasonic treatment for 20min for later use, wherein the ultrasonic frequency is 360 kHz;
4) preparing oil-based mixed liquid: taking a mixture of 28 parts by weight of palm oil, rapeseed oil and soybean oil, wherein the volume ratio of the palm oil, the rapeseed oil and the soybean oil is 1: 3: 6, adding 8 parts of OP-10NP emulsifier, uniformly stirring, adding 4 parts of triethanolamine, 4 parts of polyethylene wax, 3 parts of compound surfactant Tween 20 and fatty alcohol ether sodium sulfate (the mass ratio of the two is 5: 4), 1 part of barium petroleum sulfonate antirust agent and 1 part of polyether defoamer, and uniformly stirring for later use;
5) preparing a water-based mixed solution: 135 parts by weight of deionized water is taken, and 34 parts of sulfonated graphene/MoS obtained in the step 2) is added2Nano cage, 9 portions of glycerin and 5 portions of propylene glycol, stirringUniformly mixing for later use;
6) preparing a micro-emulsion cutting fluid: and (3) mixing the oil-based mixed solution and the water-based mixed solution obtained in the steps (4) and (5), and stirring at the rotating speed of 850r/min until the liquid is uniform and transparent to obtain the micro-emulsified cutting fluid for processing the aluminum alloy.
Table 1 shows the beneficial effects of the cooling performance of the microemulsified cutting fluid prepared by the invention.
| Cutting temperature/. degree.C | Temperature after adding cutting fluid for 4s | |
| Example 1 | 980 | 408 |
| Example 2 | 980 | 412 |
| Example 3 | 980 | 413 |
Table 2 shows the beneficial effect of high-temperature lubricity of the microemulsified cutting fluid prepared by the invention.
| Maximum no-card bite load/N at normal temperature | Maximum no-card-biting load/N at 800 DEG C | |
| Example 1 | 1766 | 1637 |
| Example 2 | 1728 | 1668 |
| Example 3 | 1760 | 1677 |
Claims (4)
1. A preparation method of a microemulsion cutting fluid for processing an aluminum alloy of an aeroengine is characterized by comprising the following steps,
1) preparing sulfonated graphene: (1) pre-reducing graphene oxide: weighing graphene oxide, dissolving the graphene oxide in deionized water, and performing ultrasonic dispersion for 2-3 hours to form a brown dispersion solution; regulating the pH value to 9-10 by using a carbonate solution, and slowly adding sodium borohydride into the carbonate solution at the temperature of 60-80 ℃ and stirring for 1-3 hours; then, re-dispersing the partially reduced graphene oxide into deionized water, and centrifuging and washing with the deionized water for 3-5 times to enable the pH value to be neutral 7; (2) sulfonation: dissolving ammonium sulfonate and nitrate in a hydrochloric acid solution, wherein the mass ratio of the ammonium sulfonate to the nitrate is 23: 9, slowly adding the mixture into the dispersion solution with the pH value of 7 in the step (1), and magnetically stirring for 4-6 hours under the ice bath condition; dispersing the product into deionized water again for dispersion, and then centrifuging and washing with deionized water for 3-5 times; (3) hydrazine hydrate reduces the remaining oxygen functional groups: adding hydrazine hydrate into the dispersion liquid obtained in the step (2), magnetically stirring for 24-36 hours at 100 ℃, and then centrifuging and washing with deionized water for 3-5 times to obtain sulfonated graphene;
2) sulfonated graphene/MoS2Preparation of nanocages: dispersing sulfonated graphene into deionized water, and performing ultrasonic treatment for 2-3 hours to form a uniform dispersion liquid; adding soluble molybdenum salt and sulfur powder into hydrazine hydrate and N, N-dimethylformamide to form a brown mixed solution, wherein the volume ratio of the hydrazine hydrate to the N, N-dimethylformamide is 1: 1, dropwise adding the brown mixed solution into sulfonated graphene dispersion liquid under the condition of stirring rotating speed of 10000-15000 revs/min, simultaneously adding hydrogen peroxide, centrifuging the obtained product, washing the product with deionized water for 3-5 times, and freeze-drying the product for 12-24 hours to finally form sulfonated graphene/MoS2A nanocage;
3) ball-milled sulfonated graphene/MoS2Nano cage: the sulfonated graphene/MoS obtained in the step 2) is used2Putting the nano cage into a ball mill, ball-milling for 2-3 h at the rotating speed of 1200-1500 r/min, and then carrying out ball-milling on the sulfonated graphene/MoS2Putting a nano cage into ethylene glycol with the weight 4-6 times of that of the nano cage, adding 2-3 parts of dimethyl sulfate and 1-2 parts of sodium dodecyl sulfate, uniformly stirring, and carrying out ultrasonic treatment for 20-25 min for later use, wherein the ultrasonic frequency is 240-360 kHz;
4) preparing oil-based mixed liquid: taking 25-28 parts by weight of biodegradable base oil, adding 6-8 parts of OP-10NP emulsifier, uniformly stirring, adding 3-4 parts of triethanolamine, 2-4 parts of polyethylene wax, 2-3 parts of compound surfactant, 1-3 parts of barium petroleum sulfonate antirust agent and 1-2 parts of polyether defoaming agent, and uniformly stirring for later use;
5) preparing a water-based mixed solution: taking 110-135 parts by weight of deionized water, and adding 26-34 parts of sulfonated graphene/MoS obtained in step 2)2Uniformly stirring a nano cage, 6-9 parts of glycerol and 3-5 parts of propylene glycol for later use;
6) preparing a micro-emulsion cutting fluid: and (3) mixing the oil-based mixed solution and the water-based mixed solution obtained in the steps (4) and (5), and stirring at the rotating speed of 720-850 r/min until the liquid is uniform and transparent to obtain the micro-emulsified cutting fluid for processing the aluminum alloy.
2. The method for preparing the microemulsion cutting fluid for the machining of the aluminum alloy of the aircraft engine according to claim 1, wherein in the step 1), the carbonate is one or a combination of sodium carbonate, potassium carbonate and lithium carbonate; the nitrate is one or the combination of sodium nitrate, potassium nitrate or lithium nitrate; the mass concentration of the hydrogen peroxide is 0.6-1 wt%.
3. The method for preparing the microemulsion cutting fluid for the machining of the aluminum alloy of the aircraft engine according to claim 1, wherein in the step 2), the molybdenum salt is one or a combination of molybdenum acetate, molybdenum citrate or molybdenum chloride.
4. The method for preparing the microemulsion cutting fluid for processing the aluminum alloy of the aircraft engine according to claim 1, wherein in the step 4), the biodegradable base oil is prepared from palm oil, rapeseed oil and soybean oil according to a volume ratio of 1: 2-3: 3-6 mixing; the compound surfactant is prepared from tween 20 and fatty alcohol ether sodium sulfate according to the mass fraction of 5: 2-4.
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