CN112940825A - Application of silicon phosphide quantum dots as lubricating oil additive, lubricating oil and preparation method and application thereof - Google Patents

Application of silicon phosphide quantum dots as lubricating oil additive, lubricating oil and preparation method and application thereof Download PDF

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CN112940825A
CN112940825A CN202110165316.6A CN202110165316A CN112940825A CN 112940825 A CN112940825 A CN 112940825A CN 202110165316 A CN202110165316 A CN 202110165316A CN 112940825 A CN112940825 A CN 112940825A
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lubricating oil
quantum dots
ultrasonic
powder
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CN112940825B (en
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王道爱
于童童
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Qingdao Center Of Resource Chemistry & New Materials (qingdao Research Development Center Lanzhou Institute Of Chemical Physics Chinese Academy Of Sciences)
Lanzhou Institute of Chemical Physics LICP of CAS
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Qingdao Center Of Resource Chemistry & New Materials (qingdao Research Development Center Lanzhou Institute Of Chemical Physics Chinese Academy Of Sciences)
Lanzhou Institute of Chemical Physics LICP of CAS
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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M125/00—Lubricating compositions characterised by the additive being an inorganic material
    • C10M125/26—Compounds containing silicon or boron, e.g. silica, sand
    • 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
    • C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
    • C10M169/04—Mixtures of base-materials and additives
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
    • C10M2201/10—Compounds containing silicon
    • C10M2201/105—Silica
    • 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
    • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
    • C10M2205/02—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers
    • C10M2205/028—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers containing aliphatic monomers having more than four carbon atoms
    • C10M2205/0285—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers containing aliphatic monomers having more than four carbon atoms used as base material
    • 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
    • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
    • C10M2205/16—Paraffin waxes; Petrolatum, e.g. slack wax
    • C10M2205/163—Paraffin waxes; Petrolatum, e.g. slack wax used as base material
    • 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
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/28—Esters
    • C10M2207/2805—Esters used as base material
    • 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
    • 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
    • C10M2209/103—Polyethers, i.e. containing di- or higher polyoxyalkylene groups
    • C10M2209/1033—Polyethers, i.e. containing di- or higher polyoxyalkylene groups used as base material
    • 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
    • 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
    • C10M2209/103—Polyethers, i.e. containing di- or higher polyoxyalkylene groups
    • C10M2209/104—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of alkylene oxides containing two carbon atoms only
    • C10M2209/1045—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of alkylene oxides containing two carbon atoms only used as base material

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Lubricants (AREA)

Abstract

The invention relates to the technical field of lubricating oil additives, in particular to application of silicon phosphide quantum dots as a lubricating oil additive, lubricating oil and a preparation method and application thereof. The invention provides an application of a silicon phosphide quantum dot as a lubricating oil additive. The invention provides lubricating oil which comprises silicon phosphide quantum dots and base oil. The results of the examples show that the lubricating oil provided by the invention has excellent wear-reducing and wear-resisting properties relative to base oil, the friction coefficient is reduced by 18%, and the wear-resisting spot diameter is reduced by 63.5%.

Description

Application of silicon phosphide quantum dots as lubricating oil additive, lubricating oil and preparation method and application thereof
Technical Field
The invention relates to the technical field of lubricating oil additives, in particular to application of silicon phosphide quantum dots as a lubricating oil additive, lubricating oil and a preparation method and application thereof.
Background
With the development of production technology, engines, agricultural machinery, micro-electro-mechanical systems and the like are rapidly developed, and the requirements on lubricating oil are higher and higher. Lubricating oil is a substance that acts on a mechanical friction portion, and is mainly used for lubrication, cooling, and sealing. In addition, in industrial production, lubricating oil also has the effects of cleaning friction parts, preventing pollution and the like. In order to improve the lubricating effect of the lubricating oil, the lubricating oil usually contains lubricating additives, so that the lubricating performance and the anti-friction performance of the lubricating oil can be greatly improved. The search for new lubricant additives has been an important measure to solve the problem of good lubricant additives.
In recent years, two-dimensional materials are linked by covalent bonds in layers and van der waals force between layers, so that the two-dimensional materials can be used as a novel solid lubricant and an excellent lubricating additive, and become hot materials for researching solid lubrication and the lubricating additive. However, the existing two-dimensional materials still have certain problems, such as zero band gap of graphene, easy agglomeration, and molybdenum disulfide (MoS)2) The application of the lubricant additive is limited due to the problems of easy deliquescence and failure in a humid environment, so that the application of the novel two-dimensional material as the lubricant additive is urgently researched.
Disclosure of Invention
In view of the above, the invention provides application of a silicon phosphide quantum dot as a lubricating oil additive, lubricating oil and a preparation method and application thereof, the lubricating oil provided by the invention takes the SiP quantum dot as the lubricating oil additive, the dispersibility of the SiP quantum dot in the lubricating oil is good, the anti-wear and anti-wear properties of the lubricating oil are obviously improved, and the average value of the friction coefficient is 0.064-0.072.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides an application of SiP quantum dots as a lubricating oil additive.
Preferably, the average particle size of the SiP quantum dots is 8-15 nm, and the average thickness of the SiP quantum dots is 1-3 nm; the mass percentage of the SiP quantum dots in the lubricating oil is 0.01-0.1%.
The invention provides lubricating oil which comprises SiP quantum dots and base oil.
Preferably, the average particle size of the SiP quantum dots is 8-15 nm, and the average thickness of the SiP quantum dots is 1-3 nm; the mass percentage of the SiP quantum dots in the lubricating oil is 0.01-0.1%.
Preferably, the base oil is polyethylene glycol base oil, polyether base oil or synthetic ester base oil.
Preferably, the preparation method of the SiP quantum dot comprises the following steps:
mixing SiP powder and a polar organic solvent, and then sequentially carrying out ultrasonic stripping, stirring, solid-liquid separation and supernatant fluid drying to obtain the SiP quantum dots;
the average particle size of the SiP powder is 1-100 mu m, and the average thickness of the SiP powder is 500-2000 nm;
the average particle size of the SiP quantum dots is 8-15 nm, and the average thickness of the SiP quantum dots is 1-3 nm.
Preferably, the polar organic solvent includes one or more of acetone, absolute ethanol, dimethyl sulfoxide, N-methylpyrrolidone, and dimethylformamide.
The power of ultrasonic stripping is 1000-1500W, the frequency of ultrasonic stripping is 20-30 kHz, and the time of ultrasonic stripping is 2-10 h;
the stirring speed is 500-1000 rpm, and the stirring time is 2-10 h;
the solid-liquid separation mode is centrifugation; the centrifugation speed is 3000-10000 r/min, and the centrifugation time is 30-100 min.
The invention provides a preparation method of lubricating oil in the technical scheme, which comprises the following steps:
and mixing the SiP quantum dots with base oil, and performing ultrasonic treatment to obtain the lubricating oil.
Preferably, the power of the ultrasound is 1000-1500W, and the time of the ultrasound is 3-10 h.
The invention provides the application of the lubricating oil in the technical scheme or the lubricating oil obtained by the preparation method in the technical scheme in friction pairs of metal-metal, metal-polymer, metal-ceramic and the like.
Compared with the prior art, the invention has the following technical effects:
the invention provides an application of SiP quantum dots as a lubricating oil additive, wherein the SiP quantum dots have a layered structure, a nanoscale interlayer spacing exists between layers, covalent bond acting force exists in the layers, van der Waals force exists between the layers, and the acting force between the layers is weaker, so that the SiP quantum dots are easier to slide between the layers; and structural elements of the structure are twisted five-membered rings and six-membered rings which are connected with each other, in-plane anisotropy is presented, the ring structure can eliminate edge dangling bonds, so that the SiP quantum dots have excellent stability, and the moisture resistance of the SiP quantum dots is improved. The SiP quantum dots are used as the lubricating oil additive, so that the good dispersibility of the SiP quantum dots in the lubricating oil is realized, and the obtained lubricating oil product has excellent antifriction and antiwear properties, stable structure and strong bearing capacity.
The invention provides lubricating oil which comprises SiP quantum dots and base oil, and the result of the embodiment shows that the average value of the friction coefficient of the lubricating oil is 0.064-0.072.
Drawings
FIG. 1 is an atomic force microscope image of SiP quantum dots prepared in example 1 of the present invention;
FIG. 2 is a thickness distribution diagram of SiP quantum dots prepared in example 1 of the present invention;
FIG. 3 is a particle size histogram of SiP quantum dots prepared in example 1 of the present invention;
FIG. 4 is a friction coefficient curve and a wear pattern of a lubricating oil obtained when SiP quantum dots prepared in example 1 of the present invention are used as additives;
FIG. 5 is a friction coefficient curve and a wear pattern of a lubricating oil obtained when SiP quantum dots prepared in example 2 of the present invention are used as additives;
FIG. 6 is a friction coefficient curve and a wear pattern of a lubricating oil obtained when SiP quantum dots prepared in example 3 of the present invention are used as additives;
FIG. 7 is a friction coefficient curve and a wear pattern of a lubricating oil obtained when SiP quantum dots prepared in example 4 of the present invention are used as additives;
FIG. 8 is a friction coefficient curve and a wear pattern of a lubricating oil obtained when SiP quantum dots prepared in example 5 of the present invention are used as additives;
FIG. 9 is a friction coefficient curve and a wear pattern of a lubricating oil obtained when SiP quantum dots prepared in example 6 of the present invention are used as additives;
FIG. 10 is a graph of the friction coefficient curve and the wear pattern of the lubricating oil obtained when SiP quantum dots prepared in example 7 of the present invention are used as additives;
FIG. 11 is a friction coefficient curve and a wear pattern of a lubricating oil obtained when SiP quantum dots prepared in example 8 of the present invention are used as additives;
FIG. 12 is a graph of the friction coefficient curve and the wear pattern of the base oil PEG-400.
Detailed Description
The invention provides an application of SiP quantum dots as a lubricating oil additive.
In the invention, the average particle size of the SiP quantum dots is preferably 8-15 nm, more preferably 9.5-13 nm, and even more preferably 12 nm; the average thickness is preferably 1 to 3nm, and more preferably 1.5 to 2 nm; the mass percentage of the SiP quantum dots in the lubricating oil is 0.01-0.1%, preferably 0.03-0.08%, and more preferably 0.05-0.06%.
The SiP quantum dot provided by the invention has a layered structure, and the acting force between layers is weak; the SiP quantum dots are used as lubricating oil additives, so that the dispersion of the SiP quantum dots in the lubricating oil is good, and the obtained lubricating oil has excellent friction-reducing and wear-resisting properties.
The invention also provides lubricating oil which comprises the SiP quantum dots and base oil.
In the invention, the mass percentage of the SiP quantum dots in the lubricating oil is preferably 0.01-0.1 wt%, more preferably 0.03-0.08%, and even more preferably 0.05-0.06%.
In the invention, the SiP quantum dots are preferably prepared; the preparation method of the IV-V group two-dimensional compound quantum dot preferably comprises the following steps:
mixing SiP powder and a polar organic solvent, and then sequentially carrying out ultrasonic stripping, stirring, solid-liquid separation and supernatant fluid drying to obtain the SiP quantum dots;
the SiP powder has an average particle diameter of 1-100 μm and an average thickness of 500-2000 nm
The average particle size of the SiP quantum dots is 8-15 nm, and the average thickness of the SiP quantum dots is 1-3 nm.
In the invention, the average particle size of the SiP powder is preferably 1-100 μm, and more preferably 40-70 μm; the average thickness is preferably 500-2000 nm, more preferably 800-1500 nm, the average particle size of the SiP quantum dots is preferably 8-15 nm, more preferably 9.5-13 nm, more preferably 12 nm; the average thickness is preferably 1 to 3nm, and more preferably 1.5 to 2 nm. The invention has no special requirements on the source of the SiP powder and can be prepared by commercial products or laboratories.
In the present invention, the SiP powder is preferably prepared by a method comprising the steps of: and grinding the SiP single crystal to obtain the SiP powder.
In the present invention, the SiP single crystal is preferably 5 to 10mm × 1mm × 1mm, and the SiP single crystal is preferably prepared according to an experimental method described in "controlled grown thin and optional electronic properties of bulk o-SiP crystals" (Li C, Wang S, Zhang X, et al Crystal EngCommm). In the embodiment of the invention, the preparation method of the SiP single crystal specifically comprises the following steps: the raw materials are as follows: p: the molar ratio of Sn is 1: 1: 5, mixing, transferring into a quartz tube, and vacuumizing to 5 × 10 with a molecular pump-3And after Pa, sealing by using oxyhydrogen flame, placing the quartz tube in a synthesis furnace, and controlling the temperature by using an FP23 temperature control meter, wherein the temperature control program is as follows: the initial temperature is room temperature, the temperature is raised to 723K and kept constant for 36h, then the temperature is raised to 973K after 36h, then the temperature is raised to 1423K after 48h, then the temperature is lowered to 873K after 500h, and the temperature is cooled to room temperature. Placing the sintered sample in a concentrated hydrochloric acid-water ratio of 1: 1, removing Sn in the sample, cleaning with ethanol and drying at 333K to obtain the productA single crystal of SiP. In the invention, the grinding time is preferably 10-30 min, and the grinding is preferably carried out by using an agate mortar and manually grinding.
In the present invention, the polar organic solvent preferably includes one or more of acetone, anhydrous ethanol, dimethyl sulfoxide (DMSO), N-methylpyrrolidone (NMP), and Dimethylformamide (DMF), and is further preferably acetone, anhydrous ethanol, dimethyl sulfoxide, N-methylpyrrolidone, or dimethylformamide; when the polar organic solvent preferably comprises more than two of acetone, absolute ethyl alcohol, dimethyl sulfoxide, N-methyl pyrrolidone and dimethylformamide, the mass ratio of the specific substances is not specially required, and any ratio is adopted. The invention has no special requirement on the source of the polar organic solvent, and can be prepared by adopting a commercial product.
In the invention, the mass volume ratio of the SiP to the polar organic solvent is preferably 0.01-0.1 g: 10-50 mL, and the method has no special requirement on the specific operation process of mixing the SiP powder and the polar organic solvent.
After the SiP powder and the polar organic solvent are mixed, the invention also preferably comprises the step of carrying out primary ultrasonic treatment on the dispersion liquid obtained after mixing, wherein the power of the primary ultrasonic treatment is preferably 150-300W, more preferably 180-250W, and most preferably 210-245W; the time of the preliminary ultrasonic treatment is preferably 1-3 hours, and more preferably 1.5-2 hours. The invention has no special requirements on the primary ultrasonic equipment, and the ultrasonic equipment well known to the technical personnel in the field can be adopted. In an embodiment of the present invention, the primary ultrasonic device is an ultrasonic cleaning machine.
According to the invention, the SiP powder is dispersed in the polar organic solvent more uniformly through preliminary ultrasound.
After the dispersion liquid is obtained, the dispersion liquid is subjected to ultrasonic stripping, the power of the ultrasonic stripping is preferably 1000-1500W, more preferably 1200-1350W, the frequency of the ultrasonic stripping is preferably 20-30 kHz, more preferably 23-28 kHz, and the time of the ultrasonic stripping is preferably 2-10 h, more preferably 4-8 h. The ultrasonic stripping equipment has no special requirement, and the ultrasonic stripping equipment is well known to those skilled in the art, and in the embodiment of the invention, the ultrasonic stripping equipment is an ultrasonic crusher.
In the invention, the stirring speed is preferably 500-1000 rpm, more preferably 650-800 rpm, the stirring time is preferably 2-10 h, more preferably 3.5-7.8 h, and the invention has no special requirement on the stirring mode. In the embodiment of the present invention, the stirring manner is preferably magnetic stirring.
In the present invention, the solid-liquid separation is preferably performed by centrifugation; the centrifugal speed is preferably 3000-10000 r/min, and is further preferably 4500-8900 r/min; the time for centrifugation is preferably 30-100 min.
After the solid-liquid separation is finished, the supernatant is preferably dried, the volume of the supernatant is preferably 2/3-4/5 of the volume of the liquid after the solid-liquid separation, the drying temperature is preferably 80-150 ℃, the drying time is preferably 2 hours, and the drying is preferably carried out in a drying oven.
In the present invention, the lubricating oil further comprises a base oil. In the present invention, the base oil is preferably a polyethylene glycol base oil, a polyether base oil, or a synthetic ester base oil, more preferably a polyethylene glycol base oil, liquid paraffin, or Polyalphaolefin (PAO), and in the embodiment of the present invention, the base oil is preferably PEG-400, PEG-800, liquid paraffin, Polyalphaolefin (PAO). The invention has no special requirement on the source of the base oil, and can adopt a commercial product.
In the invention, the mass percentage of the SiP quantum dots in the lubricating oil is 0.01-0.1%, preferably 0.03-0.08%, and more preferably 0.05-0.06%.
The invention provides a preparation method of lubricating oil in the technical scheme, which comprises the following steps:
and mixing the SiP quantum dots with base oil, and performing ultrasonic treatment to obtain the lubricating oil.
The invention has no special requirements on the specific operation process of the mixing.
In the invention, the power of the ultrasonic wave is preferably 1000-1500W, and more preferably 1150-1350W; the ultrasonic time is preferably 3-10 h, and further preferably 4.5-8.5 h.
The invention provides the application of the lubricating oil in the technical scheme or the lubricating oil obtained by the preparation method in the technical scheme in friction pairs of metal-metal, metal-polymer, metal-ceramic and the like.
In order to better understand the present invention, the following examples are further provided to illustrate the present invention, but the present invention is not limited to the following examples.
Example 1
The raw materials are as follows: p: the molar ratio of Sn is 1: 1: 5, mixing, transferring into a quartz tube, and vacuumizing to 5 × 10 with a molecular pump-3And after Pa, sealing by using oxyhydrogen flame, placing the quartz tube in a synthesis furnace, and controlling the temperature by using an FP23 temperature control meter, wherein the temperature control program is as follows: the initial temperature is room temperature, the temperature is raised to 723K and kept constant for 36h, then the temperature is raised to 973K after 36h, then the temperature is raised to 1423K after 48h, then the temperature is lowered to 873K after 500h, and the temperature is cooled to room temperature. Placing the sintered sample in a concentrated hydrochloric acid-water ratio of 1: 1, removing Sn in the sample, cleaning with ethanol and drying at 333K to obtain the SiP single crystal. In the invention, the grinding time is preferably 10-30 min, and the grinding is preferably carried out by using an agate mortar and manually grinding.
Grinding the SiP single crystal by using an agate mortar for 10min to obtain SiP powder (the particle size is 50 mu m, the thickness is 500nm), then mixing the SiP powder with acetone (the mass-volume ratio of the SiP powder to the acetone is 0.1 g: 50mL), firstly using a 200W ultrasonic cleaner to perform preliminary ultrasonic dispersion, wherein the treatment time is 1h, and then using an ultrasonic crusher with the power of 1000W and the frequency of 20kHz to perform liquid-phase ultrasonic stripping on the SiP powder, wherein the ultrasonic stripping time is 2 h; obtaining acetone dispersion of SiP;
transferring the obtained acetone dispersion liquid of the SiP into a beaker, magnetically stirring for 2 hours at the stirring speed of 500rpm, finally centrifuging for 60 minutes at the centrifugal speed of 3000r/min, taking 2/3 of the liquid volume after solid-liquid separation as a supernatant, and drying the obtained supernatant (the drying temperature is 80 ℃ and the drying time is 2 hours) to obtain the SiP quantum dots;
and mixing the SiP quantum dots with PEG-400 base oil, and carrying out ultrasonic treatment for 3h by using a 1200W ultrasonic crusher to obtain the lubricating oil containing the SiP quantum dots with the mass fraction of 0.03%.
Fig. 1 is an atomic force microscope image of the SiP quantum dot prepared in this embodiment, and it can be seen from fig. 1 that the SiP quantum dot prepared in this embodiment is in a dispersed state and has a uniform particle size;
fig. 2 is a thickness distribution diagram of the SiP quantum dots prepared in this embodiment, where the ordinate is the thickness dimension of the SiP quantum dots, and the abscissa is the transverse arrangement dimension of the SiP quantum dots, and it can be obtained from fig. 2 that the thickness of the SiP quantum dots prepared in this embodiment is less than 3 nm; fig. 3 is a statistical graph of the average particle size of the SiP quantum dots prepared in this example, wherein the average size of the particle size is 12.4 nm.
Example 2
Grinding SiP single crystals for 15min by using an agate mortar to obtain SiP powder (the particle size is 50 mu m, the thickness is 2000nm), then mixing the SiP powder with NMP (the mass-volume ratio of the SiP powder to the NMP is 0.01 g: 10mL), firstly performing primary ultrasonic dispersion by using a 200W ultrasonic cleaner for 1h, then performing liquid-phase ultrasonic stripping on the SiP powder by using an ultrasonic crusher with the power of 1200W and the frequency of 50kHz, wherein the ultrasonic stripping time is 3 h; obtaining an NMP dispersion of SiP;
transferring the obtained NMP dispersion liquid of the SiP into a beaker, magnetically stirring for 3 hours at the stirring speed of 600rpm, finally centrifuging for 60 minutes at the centrifugal speed of 3000r/min, taking 2/3 of the liquid volume after solid-liquid separation as a supernatant, and drying the obtained supernatant (the drying temperature is 100 ℃, and the drying time is 2 hours) to obtain the SiP quantum dots;
and mixing the SiP quantum dots with PEG-400 base oil, and carrying out ultrasonic treatment for 3h by adopting a 1500W ultrasonic crusher to obtain the lubricating oil containing the SiP quantum dots with the mass fraction of 0.05%.
Example 3
Grinding the SiP single crystal by using an agate mortar for 20min to obtain SiP powder (the particle size is 50 mu m, the thickness is 800nm), then mixing the SiP powder and DMF (the mass volume ratio of the SiP powder to the DMF is 0.05 g: 50mL), firstly using a 250W ultrasonic cleaner to perform preliminary ultrasonic dispersion, wherein the treatment time is 3h, and then using an ultrasonic crusher with the power of 1300W and the frequency of 40kHz to perform liquid-phase ultrasonic stripping on the SiP powder, wherein the ultrasonic stripping time is 2 h; obtaining DMF dispersion liquid of SiP;
transferring the obtained DMF dispersion liquid of the SiP into a beaker, carrying out magnetic stirring for 5h at the stirring speed of 800rpm, finally carrying out centrifugation for 60min at the centrifugation speed of 5000r/min, taking 2/3 of the liquid volume after solid-liquid separation as a supernatant, and drying the obtained supernatant (the drying temperature is 120 ℃, and the drying time is 2h) to obtain the SiP quantum dots;
and mixing the SiP quantum dots with PEG-400 base oil, and carrying out ultrasonic treatment for 3h by adopting a 1500W ultrasonic crusher to obtain the lubricating oil containing the SiP quantum dots with the mass fraction of 0.03%.
Example 4
Grinding the SiP single crystal by using an agate mortar for 20min to obtain SiP powder (the particle size is 50 mu m, the thickness is 1500nm), then mixing the SiP powder with DMSO, firstly performing primary ultrasonic dispersion by using a 300W ultrasonic cleaner for 3h, then performing liquid phase ultrasonic stripping on the SiP powder by using an ultrasonic crusher with the power of 1500W and the frequency of 40kHz, wherein the ultrasonic stripping time is 5 h; obtaining DMSO dispersion of SiP;
transferring the obtained DMSO dispersion liquid of the SiP into a beaker, carrying out magnetic stirring for 5h at the stirring speed of 800rpm, finally carrying out centrifugation for 60min at the centrifugation speed of 6000r/min, taking 2/3 of the liquid volume after solid-liquid separation as a supernatant, and drying the obtained supernatant (the drying temperature is 120 ℃, and the drying time is 2h) to obtain the SiP quantum dots;
and mixing the SiP quantum dots with PEG-400 base oil, and carrying out ultrasonic treatment for 3h by adopting a 1500W ultrasonic crusher to obtain the lubricating oil containing the SiP quantum dots with the mass fraction of 0.07%.
Example 5
Grinding the SiP single crystal by using an agate mortar for 20min to obtain SiP powder (the particle size is 50 mu m, the thickness is 1000nm), then mixing the SiP powder with absolute ethyl alcohol (the mass-volume ratio of the SiP powder to the absolute ethyl alcohol is 0.1 g: 50mL), firstly using a 220W ultrasonic cleaner to perform preliminary ultrasonic dispersion, wherein the treatment time is 3h, then using an ultrasonic crusher with the power of 1100W and the frequency of 40kHz to perform liquid-phase ultrasonic stripping on the SiP powder, and the ultrasonic stripping time is 5 h; obtaining an absolute ethyl alcohol dispersion liquid of SiP;
transferring the obtained absolute ethyl alcohol dispersion liquid of the SiP into a beaker, carrying out magnetic stirring for 5 hours at the stirring speed of 800rpm, finally carrying out centrifugation for 60 minutes at the centrifugation speed of 7000r/min, taking 2/3 of the liquid volume after solid-liquid separation as a supernatant, and drying the obtained supernatant (the drying temperature is 120 ℃, and the drying time is 2 hours) to obtain the SiP quantum dots;
and mixing the SiP quantum dots with PEG-400 base oil, and carrying out ultrasonic treatment for 3h by using a 1400W ultrasonic crusher to obtain the lubricating oil containing the SiP quantum dots with the mass fraction of 0.06%.
Example 6
Grinding the SiP single crystal by using an agate mortar for 30min to obtain SiP powder (the particle size is 80 mu m, the thickness is 1800nm), then mixing the SiP powder with acetone (the mass-volume ratio of the SiP powder to the acetone is 0.05 g: 25mL), firstly using a 250W ultrasonic cleaner to perform preliminary ultrasonic dispersion, wherein the treatment time is 1h, and then using an ultrasonic crusher with the power of 1600W and the frequency of 20kHz to perform liquid-phase ultrasonic stripping on the SiP powder, wherein the ultrasonic stripping time is 2 h; obtaining acetone dispersion of SiP;
transferring the obtained acetone dispersion liquid of the SiP into a beaker, magnetically stirring for 7 hours at the stirring speed of 500rpm, finally centrifuging for 60 minutes at the centrifugal speed of 3000r/min, taking 2/3 of the liquid volume after solid-liquid separation as a supernatant, and drying the obtained supernatant (the drying temperature is 80 ℃, and the drying time is 2 hours) to obtain the SiP quantum dots;
and mixing the SiP quantum dots with PEG-400 base oil, and carrying out ultrasonic treatment for 3h by using a 1700W ultrasonic crusher to obtain the lubricating oil containing the SiP quantum dots with the mass fraction of 0.02%.
Example 7
Grinding SiP single crystals for 30min by using an agate mortar to obtain SiP powder (the particle size is 50 mu m, the thickness is 1500nm), then mixing the SiP powder with NMP (the mass-volume ratio of the SiP powder to the NMP is 0.1 g: 50mL), firstly using a 270W ultrasonic cleaner to perform preliminary ultrasonic dispersion, wherein the treatment time is 6h, then using an ultrasonic crusher with the power of 1700W and the frequency of 20kHz to perform liquid-phase ultrasonic stripping on the SiP powder, and the ultrasonic stripping time is 3 h; obtaining an NMP dispersion of SiP;
transferring the obtained NMP dispersion liquid of the SiP into a beaker, magnetically stirring for 5 hours at the stirring speed of 800rpm, finally centrifuging for 60 minutes at the centrifugation speed of 8000r/min, taking 2/3 of the liquid volume after solid-liquid separation as a supernatant, and drying the obtained supernatant (the drying temperature is 80 ℃, and the drying time is 2 hours) to obtain the SiP quantum dots;
and mixing the SiP quantum dots with PEG-400 base oil, and carrying out ultrasonic treatment for 3h by adopting a 1500W ultrasonic crusher to obtain the lubricating oil containing the SiP quantum dots with the mass fraction of 0.09%.
Example 8
Grinding the SiP single crystal by using an agate mortar for 20min to obtain SiP powder (the particle size is 50 mu m, the thickness is 500nm), then mixing the SiP powder and NMF (the mass-volume ratio of the SiP powder to the NMF is 0.1 g: 50mL), firstly using a 250W ultrasonic cleaner to perform preliminary ultrasonic dispersion, wherein the treatment time is 3h, and then using an ultrasonic crusher with the power of 1300W and the frequency of 20kHz to perform liquid-phase ultrasonic stripping on the SiP powder, wherein the ultrasonic stripping time is 2 h; obtaining an NMF dispersion of SiP;
transferring the obtained NMF dispersion liquid of the SiP into a beaker, carrying out magnetic stirring for 5 hours at the stirring speed of 800rpm, finally carrying out centrifugation for 60 minutes at the centrifugation speed of 5000r/min, taking 2/3 of the liquid volume after solid-liquid separation as a supernatant, and drying the obtained supernatant (the drying temperature is 80 ℃, and the drying time is 2 hours) to obtain the SiP quantum dots;
and mixing the SiP quantum dots with PEG-400 base oil, and carrying out ultrasonic treatment for 3h by adopting a 1500W ultrasonic crusher to obtain the lubricating oil containing the SiP quantum dots with the mass fraction of 0.03%.
Test example 1
The lubricating oil and the PEG-400 base oil prepared in the embodiments 1 to 8 are subjected to a friction wear test, and the test method comprises the following steps: a four-ball friction tester is adopted, the testing time is 30min, the load is 200kgf, and the used balls are stainless steel balls with the diameter of 12.7 mm. The friction coefficients and the wear marks obtained by the test are shown in fig. 4-12 (wherein fig. 4-11 are friction coefficient and wear mark graphs of the lubricating oil described in examples 1-8 in sequence, and fig. 12 is a friction coefficient and wear mark graph of the PEG-400 base oil), and the specific friction coefficients and wear mark sizes are shown in table 1. As can be seen from the results in Table 1 and FIGS. 4 to 12, the lubricating oils prepared in examples 1 to 8 are superior to PEG-400 base oil in anti-wear and anti-wear properties, the average value of the friction coefficient is 0.064 to 0.072, and the size of the wear pattern is significantly reduced.
TABLE 1 Friction and wear test data for the lubricating oils prepared in PEG-400 and examples 1-8
Figure BDA0002937588360000101
Figure BDA0002937588360000111
The principle and the implementation mode of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.

Claims (10)

  1. The application of the SiP quantum dots as lubricating oil additives.
  2. 2. The use according to claim 1, wherein the SiP quantum dots have an average particle size of 8 to 15nm and an average thickness of 1 to 3 nm; the mass percentage of the SiP quantum dots in the lubricating oil is 0.01-0.1%.
  3. 3. A lubricating oil is characterized by comprising SiP quantum dots and base oil.
  4. 4. The lubricating oil of claim 3, wherein the SiP quantum dots have an average particle size of 8 to 15nm and an average thickness of 1 to 3 nm; the mass percentage of the SiP quantum dots in the lubricating oil is 0.01-0.1%.
  5. 5. The lubricating oil of claim 3, wherein the base oil is a polyethylene glycol base oil, a polyether base oil, or a synthetic ester base oil.
  6. 6. The lubricating oil of claim 3, wherein the preparation method of the SiP quantum dots comprises the following steps:
    mixing SiP powder and a polar organic solvent, and then sequentially carrying out ultrasonic stripping, stirring, solid-liquid separation and supernatant fluid drying to obtain the SiP quantum dots;
    the average particle size of the SiP powder is 1-100 mu m, and the average thickness of the SiP powder is 500-2000 nm;
    the average particle size of the SiP quantum dots is 8-15 nm, and the average thickness of the SiP quantum dots is 1-3 nm.
  7. 7. The lubricating oil of claim 6, wherein the polar organic solvent comprises one or more of acetone, absolute ethanol, dimethyl sulfoxide, N-methylpyrrolidone, and dimethylformamide;
    the power of ultrasonic stripping is 1000-1500W, the frequency of ultrasonic stripping is 20-30 kHz, and the time of ultrasonic stripping is 2-10 h;
    the stirring speed is 500-1000 rpm, and the stirring time is 2-10 h;
    the solid-liquid separation mode is centrifugation; the centrifugation speed is 3000-10000 r/min, and the centrifugation time is 30-100 min.
  8. 8. A method for preparing the lubricating oil according to any one of claims 3 to 7, characterized by comprising the steps of:
    and mixing the SiP quantum dots with base oil, and performing ultrasonic treatment to obtain the lubricating oil.
  9. 9. The preparation method of claim 8, wherein the power of the ultrasound is 1000-1500W, and the time of the ultrasound is 3-10 h.
  10. 10. Use of the lubricating oil according to any one of claims 3 to 7 or the lubricating oil obtained by the preparation method according to claim 8 or 9 in friction pairs such as metal-metal, metal-polymer, metal-ceramic and the like.
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