CN110591806B - Water-based lubricating fluid and preparation method thereof - Google Patents
Water-based lubricating fluid and preparation method thereof Download PDFInfo
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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
- C10M173/00—Lubricating compositions containing more than 10% water
- C10M173/02—Lubricating compositions containing more than 10% water not containing mineral or fatty oils
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
- C10M2201/04—Elements
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
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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
- C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
- C10M2201/06—Metal compounds
- C10M2201/065—Sulfides; Selenides; Tellurides
- C10M2201/066—Molybdenum sulfide
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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
- C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
- C10M2209/12—Polysaccharides, e.g. cellulose, biopolymers
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Abstract
The invention discloses a water-based lubricating liquid and a preparation method thereof. The water-based lubricating fluid comprises: water, an oxidizing agent and a nano material, wherein the surface of the nano material after being oxidized by the oxidizing agent contains hydrophilic functional groups. The surface of the water-based lubricating fluid contains hydrophilic functional groups, has excellent dispersing performance in water, excellent water absorption and retention performance, ultralow friction coefficient and high abrasion resistance, stable friction coefficient is not more than 0.01, and the minimum friction coefficient can reach 0.0014.
Description
Technical Field
The invention belongs to the technical field of novel lubricating materials, and particularly relates to a water-based lubricating liquid and a preparation method thereof.
Background
Friction is one of the main causes of energy consumption in human production and life, and meanwhile, abrasion caused by friction is one of the main causes of damage to mechanical equipment, so that the reduction of friction and abrasion through various technical means is the primary problem of equipment operation and maintenance. Lubrication is the most effective technique for reducing friction and abrasion, and is of great importance for improving the utilization efficiency of energy and reducing the loss of materials. The most widely used lubricating products at present are based on mineral oil or synthetic oil, and are prepared by matching with additives, and the friction coefficient is generally about 0.1. The oil-based lubricating fluid is a great threat to the environment, the leakage, penetration, overflow and the like of the lubricating oil can inhibit plant growth, harm aquatic organisms and influence human health, and meanwhile, along with the development and progress of science and technology, the lubricating fluid is required to be used so as to enable the friction pair to have lower friction coefficient and wear resistance. Therefore, research on the lubricant which has an ultra-low friction coefficient and is environment-friendly is needed for social development, and has huge market prospect and social significance.
The water-based lubricating fluid is a rapidly-developed environment-friendly lubricant, has the advantages of no toxicity, no combustion, no pollution, wide sources, low price, good cooling performance and the like, and has wide application prospect. However, water has low surface tension and viscosity-pressure coefficient compared with mineral oil, so that an effective lubricating film is difficult to form, and the popularization and application of the water-based lubricating liquid are influenced.
The nanometer material as lubricant additive can improve the tribological performance of lubricant effectively, form lubricant film between friction pair and improve the antiwear and antifriction performance of lubricant. However, since the nano material has high specific surface area and surface energy, the nano material has relatively poor dispersibility in the water-based lubricating fluid and is easy to agglomerate to generate precipitates. Meanwhile, the friction coefficient of the water-based lubricating fluid directly added with the nano material is about 0.1, and compared with the oil-based lubricating fluid, the water-based lubricating fluid has no advantage in the friction coefficient.
Therefore, the development of the water-based lubricating fluid with ultralow friction coefficient, environmental friendliness and low cost has huge market prospect and social significance.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. To this end, an object of the present invention is to propose a water-based lubricating fluid and a method for preparing the same. The surface of the water-based lubricating fluid contains hydrophilic functional groups, has excellent dispersing performance in water, excellent water absorption and retention performance, ultralow friction coefficient and high abrasion resistance, stable friction coefficient is not more than 0.01, and the minimum friction coefficient can reach 0.0014.
In one aspect of the invention, the invention provides a water-based lubricating fluid comprising, in accordance with an embodiment of the invention: water, an oxidizing agent and a nano material, wherein the surface of the nano material after being oxidized by the oxidizing agent contains hydrophilic functional groups.
According to the water-based lubricating liquid disclosed by the embodiment of the invention, the water-based lubricating liquid comprises water, an oxidant and a nano material, and the surface of the nano material after being oxidized by the oxidant contains hydrophilic functional groups, so that the water-based lubricating liquid can be uniformly dispersed in water, has excellent water absorption and water retention performances, and has an ultralow friction coefficient and high wear resistance, the stable friction coefficient is not more than 0.01, and the minimum friction coefficient can reach 0.0014. Meanwhile, the water-based lubricating fluid adopts water as a basic raw material, has the advantages of low cost, environmental friendliness and easiness in popularization, and is convenient to popularize and apply. Furthermore, the specific type of the nano material can be selected and the concentration of the nano material can be adjusted according to different environments and working conditions, and the degree of oxidation of the nano material can be adjusted and controlled by adjusting the concentration and the content of the oxidant, namely the quantity of hydrophilic functional groups on the surface of the oxidized nano material is adjusted, so that the adjustment and control of the performance of the water-based lubricating fluid are realized.
In addition, the water-based lubricating fluid according to the above embodiment of the present invention may also have the following additional technical features:
in some embodiments of the present invention, the oxidizing agent is at least one selected from hydrogen peroxide and sodium peroxide.
In some embodiments of the invention, the nanomaterial is selected from at least one of a nanoparticle, a nanofiber, and a nanoplatelet.
In some embodiments of the invention, the nanoparticles are selected from at least one of carbon nanoparticles, black phosphorus nanoparticles, and molybdenum disulfide nanoparticles.
In some embodiments of the invention, the nanoparticles have a size of 2-500 nm.
In some embodiments of the present invention, the nanofibers are selected from at least one of carbon nano chopped fibers, carbon nanotubes, carbon nanowires, and nanocellulose.
In some embodiments of the invention, the nanofibers have a diameter of 10 to 100nm and a length of 1 to 10 μm.
In some embodiments of the invention, the nanoplatelets are selected from at least one of graphene, graphene oxide, black phosphorus and molybdenum disulfide.
In some embodiments of the invention, the nanoplatelets have a thickness of 1-50nm and a diameter of 0.2-100 μm.
In a further aspect of the invention, there is provided a method of preparing the above water-based lubricating fluid, according to an embodiment of the invention, the method comprising:
(1) dispersing the nanomaterial in water to obtain a water-based solution containing the nanomaterial;
(2) and mixing, stirring and dispersing the oxidant and the water-based solution containing the nano material, and separating to obtain the water-based lubricating liquid.
According to the method for preparing the water-based lubricating liquid, disclosed by the embodiment of the invention, the nano material is dispersed in water, namely water is adopted as a basic raw material, so that the method has the advantages of low cost, environmental friendliness and easiness in popularization and application, and the nano material can be uniformly dispersed in the water after being dispersed; the oxidant and the water-based solution containing the nano material are mixed, stirred and dispersed, so that the reaction rate and the reaction effect of the oxidant and the nano material can be improved as the nano material is uniformly dispersed in the water-based solution containing the nano material, the oxidant reacts with the nano material to oxidize the nano material, the surface of the nano material is rich in hydrophilic functional groups, and the water-based lubricating liquid can be uniformly dispersed in water under the action of the hydrophilic functional groups and has excellent water absorption and water retention properties. Furthermore, the specific type of the nano material can be selected and the concentration of the nano material can be adjusted according to different environments and working conditions, and the degree of oxidation of the nano material can be adjusted and controlled by adjusting the concentration and the content of the oxidant, namely the quantity of hydrophilic functional groups on the surface of the oxidized nano material is adjusted, so that the adjustment and control of the performance of the water-based lubricating fluid are realized. Through a large number of experiments, the inventor finds that the water-based lubricating fluid obtained by the method has ultralow friction coefficient and high abrasion resistance, the stable friction coefficient is not more than 0.01, and the minimum friction coefficient can reach 0.0014.
In addition, the method of preparing the water-based lubricating fluid according to the above embodiment of the present invention may also have the following additional technical features:
in some embodiments of the invention, in step (1), the concentration of the nanomaterial in the nanomaterial-containing aqueous-based solution is from 0.1 to 10 mg/mL.
In some embodiments of the invention, in step (2), the concentration of the oxidizing agent is from 25 to 35 wt%.
In some embodiments of the invention, the volume ratio of the oxidizing agent to the nanomaterial-containing aqueous-based solution is from 0.05 to 10: 100.
in some embodiments of the invention, the dispersion in step (1) and step (2) is ultrasonic dispersion.
In some embodiments of the invention, in step (2), the time for said dispersing is 10-1200 min.
In some embodiments of the present invention, in step (2), the separation is centrifugation at 1000-.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic flow diagram of a method of preparing a water-based lubricating fluid according to one embodiment of the present invention;
FIG. 2 is a graph of coefficient of friction versus wear time for the water-based lubricating fluid obtained in example 1;
FIG. 3 is a graph of coefficient of friction versus wear time for the water-based lubricating fluid obtained in example 2;
FIG. 4 is a graph of coefficient of friction versus wear time for the water-based lubricating fluid obtained in example 3.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In one aspect of the invention, the invention provides a water-based lubricating fluid comprising, in accordance with an embodiment of the invention: water, an oxidant and a nano material, wherein the surface of the nano material after being oxidized by the oxidant contains hydrophilic functional groups. The inventor finds that the water-based lubricating fluid comprises water, an oxidant and a nano material, and the surface of the nano material after being oxidized by the oxidant contains hydrophilic functional groups, so that the water-based lubricating fluid can be uniformly dispersed in the water, has excellent water absorption and water retention performance, and has ultralow friction coefficient and high wear resistance, the stable friction coefficient is not more than 0.01, and the minimum friction coefficient can reach 0.0014. Meanwhile, the water-based lubricating fluid adopts water as a basic raw material, has the advantages of low cost, environmental friendliness and easiness in popularization, and is convenient to popularize and apply. Furthermore, the specific type of the nano material can be selected and the concentration of the nano material can be adjusted according to different environments and working conditions, and the degree of oxidation of the nano material can be adjusted and controlled by adjusting the concentration and the content of the oxidant, namely the quantity of hydrophilic functional groups on the surface of the oxidized nano material is adjusted, so that the adjustment and control of the performance of the water-based lubricating fluid are realized. The water may be deionized water.
According to an embodiment of the present invention, the specific type of the oxidizing agent is not particularly limited, and may be selected by a person skilled in the art according to actual needs, for example, at least one selected from hydrogen peroxide and sodium peroxide, preferably hydrogen peroxide. The inventor finds that the oxidant can well react with the nano material, so that the surface of the nano material is rich in hydrophilic functional groups such as hydroxyl and the like. The hydrogen peroxide solution may be a commercially available aqueous hydrogen peroxide solution. Further, the concentration of the oxidizing agent is not particularly limited, and can be selected by those skilled in the art according to actual needs, for example, according to specific types of nanomaterials, cost of the oxidizing agent with different concentrations, and the like, and can be, for example, 25 to 35 wt%, and preferably 30 wt%.
According to a further embodiment of the present invention, the specific class of the nanomaterial is not particularly limited, and the person skilled in the art may select the nanomaterial according to actual needs as long as the selected nanomaterial can be oxidized by the selected oxidizing agent and the surface of the nanomaterial is enriched with hydrophilic groups, for example, at least one of nanoparticles, nanofibers, and nanosheets, and how to select the nanomaterial specifically, the person skilled in the art may select the nanomaterial according to a specific use scenario of the water-based lubricating liquid. Further, the nanoparticles may be selected from at least one of carbon nanoparticles, black phosphorus nanoparticles, and molybdenum disulfide nanoparticles. The size of the nanoparticles may be 2-500 nm. The inventors have found that the nanoparticles may not be of a uniform single size and are generally of a range of values, with too large a size increasing wear of the friction pair and too small a size increasing production costs. Further, the nanofiber may be selected from at least one of a carbon nano chopped fiber, a carbon nanotube, a carbon nanowire, and a nanocellulose. The nanofiber has a diameter of 10-100nm, such as 10nm, 20nm, 40nm, 60nm, 80nm, 100nm, and a length of 1-10 μm, such as 1 μm, 2 μm, 4 μm, 6 μm, 8 μm, 10 μm. Further, the nanoplatelets may be selected from at least one of graphene, graphene oxide, black phosphorus and molybdenum disulfide. The nanoplatelets can have a thickness of 1-50nm and a diameter of 0.2-100 μm.
According to the water-based lubricating liquid disclosed by the embodiment of the invention, the water-based lubricating liquid comprises water, an oxidant and a nano material, and the surface of the nano material after being oxidized by the oxidant contains hydrophilic functional groups, so that the water-based lubricating liquid can be uniformly dispersed in water, has excellent water absorption and water retention performances, and has an ultralow friction coefficient and high wear resistance, the stable friction coefficient is not more than 0.01, and the minimum friction coefficient can reach 0.0014. Meanwhile, the water-based lubricating fluid adopts water as a basic raw material, has the advantages of low cost, environmental friendliness and easiness in popularization, and is convenient to popularize and apply. Furthermore, the specific type of the nano material can be selected and the concentration of the nano material can be adjusted according to different environments and working conditions, and the degree of oxidation of the nano material can be adjusted and controlled by adjusting the concentration and the content of the oxidant, namely the quantity of hydrophilic functional groups on the surface of the oxidized nano material is adjusted, so that the adjustment and control of the performance of the water-based lubricating fluid are realized.
In a further aspect of the invention, the invention provides a method of preparing the above water-based lubricating fluid, according to an embodiment of the invention, with reference to fig. 1, the method comprising:
s100: dispersing the nanomaterial in water
In this step, the nanomaterial is stirred with water and the nanomaterial is dispersed in water to obtain a water-based solution containing the nanomaterial. The inventor finds that the nano material is dispersed in water, namely water is used as a basic raw material, so that the nano material has the advantages of low cost, environmental friendliness and easiness in popularization and application, and can be uniformly dispersed in water after being dispersed. Furthermore, the specific type of the nano material can be selected and the concentration of the nano material can be adjusted according to different environments and working conditions. Specifically, the nano material can be added into deionized water, and stirring and ultrasonic dispersion are carried out to prepare the water-based solution containing the nano material.
According to an embodiment of the present invention, the concentration of the nanomaterial in the nanomaterial-containing aqueous solution may be 0.1 to 10mg/mL, and specifically, may be 0.1mg/mL, 0.5mg/mL, 1mg/mL, 2mg/mL, 4mg/mL, 6mg/mL, 8mg/mL, 10 mg/mL. The inventor finds that if the concentration of the nanomaterial in the water-based solution containing the nanomaterial is too small to exert a lubricating effect, too large results in severe wear of the friction pair.
S200: mixing oxidant and water-base solution containing nano material, stirring, dispersing and separating
In the step, an oxidant can be added into a water-based solution containing the nano material, the mixture is continuously stirred, ultrasonic dispersion is carried out, then the solution after dispersion is centrifugally separated, and supernatant liquor is taken, namely the water-based lubricating liquid. The inventor finds that the reaction rate and the reaction effect of the oxidant and the nano material can be improved due to the fact that the nano material is uniformly dispersed in the water-based solution containing the nano material by mixing, stirring and dispersing the oxidant and the water-based solution containing the nano material, the oxidant reacts with the nano material to oxidize the nano material, the surface of the nano material is rich in hydrophilic functional groups, and the water-based lubricating liquid can be uniformly dispersed in water under the action of the hydrophilic functional groups and has excellent water absorption and water retention performances. Furthermore, the degree of oxidation of the nano material can be regulated and controlled by regulating the concentration and the content of the oxidant, namely the quantity of hydrophilic functional groups on the surface of the oxidized nano material is regulated and controlled, so that the regulation and control of the performance of the water-based lubricating fluid are realized. The obtained water-based lubricating liquid has ultralow friction coefficient and high abrasion resistance, the stable friction coefficient is not more than 0.01, and the minimum friction coefficient can reach 0.0014.
According to an embodiment of the present invention, the concentration of the oxidizing agent is not particularly limited, and may be selected by those skilled in the art according to actual needs, for example, according to specific types of the nanomaterial, cost of the oxidizing agent with different concentration, and the like, and may be, for example, 25 to 35 wt%, and preferably 30 wt%.
According to another embodiment of the present invention, the volume ratio of the oxidizing agent to the water-based solution containing the nanomaterial is not particularly limited, and may be selected by those skilled in the art according to actual needs, and may be, for example, 0.05 to 10: 100. for example, it may be 0.05/0.1/0.5/1/2/4/6/8/10: 100. the inventor finds that if the adding proportion of the oxidant is too high, the nanometer material can be seriously oxidized, and the lubricating effect is lost; and if the adding proportion of the oxidant is too low, the optimization effect of oxidation is achieved.
According to another embodiment of the present invention, the dispersing time is not particularly limited, and can be selected by one skilled in the art according to actual needs, for example, 10-1200min, such as 10min, 50min, 100min, 200min, 400min, 600min, 800min, 1000min, 1200 min. The inventors found that the extension of the dispersion time is advantageous for the uniform dispersion and sufficient progress of the oxidation of the nanoparticles, while the ultrasonic dispersion is advantageous for the exfoliation of the two-dimensional nanosheets. However, if the ultrasonic dispersion time is too long, on one hand, the time cost is increased, and on the other hand, the two-dimensional nanosheets are broken and the nanofibers are broken, and preferably, the dispersion time can be 120 min.
According to still another embodiment of the present invention, when the separation is centrifugation, the rotation speed of the centrifugation may be 1000-. The inventors have found that the centrifugation speed is mainly used for removing the residual nanoparticles which are not surface functionalized, the separation effect is stronger when the rotation speed is higher and the time is longer, and preferably, the separation speed can be 3000rpm and the time is 20 min.
According to the method for preparing the water-based lubricating liquid, disclosed by the embodiment of the invention, the nano material is dispersed in water, namely water is adopted as a basic raw material, so that the method has the advantages of low cost, environmental friendliness and easiness in popularization and application, and the nano material can be uniformly dispersed in the water after being dispersed; the oxidant and the water-based solution containing the nano material are mixed, stirred and dispersed, so that the reaction rate and the reaction effect of the oxidant and the nano material can be improved as the nano material is uniformly dispersed in the water-based solution containing the nano material, the oxidant reacts with the nano material to oxidize the nano material, the surface of the nano material is rich in hydrophilic functional groups, and the water-based lubricating liquid can be uniformly dispersed in water under the action of the hydrophilic functional groups and has excellent water absorption and water retention properties. Furthermore, the specific type of the nano material can be selected and the concentration of the nano material can be adjusted according to different environments and working conditions, and the degree of oxidation of the nano material can be adjusted and controlled by adjusting the concentration and the content of the oxidant, namely the quantity of hydrophilic functional groups on the surface of the oxidized nano material is adjusted, so that the adjustment and control of the performance of the water-based lubricating fluid are realized. Through a large number of experiments, the inventor finds that the water-based lubricating fluid obtained by the method has ultralow friction coefficient and high abrasion resistance, the stable friction coefficient is not more than 0.01, and the minimum friction coefficient can reach 0.0014.
It should be noted that the features and advantages of the water-based lubricating fluid are also applicable to the method for preparing the water-based lubricating fluid, and are not described in detail.
The invention will now be described with reference to specific examples, which are intended to be illustrative only and not to be limiting in any way.
Example 1
The water-based lubricating liquid consists of graphene oxide nanosheets, deionized water and hydrogen peroxide, and the preparation method comprises the following steps:
(1) weighing 20mg of graphene oxide nanosheets, adding the graphene oxide nanosheets into 20mL of deionized water, magnetically stirring for 20min, and then performing ultrasonic dispersion for 2h to prepare a water-based solution containing the graphene oxide nanosheets, wherein the graphene oxide nanosheets are 3-10nm in thickness and 0.5-60 microns in diameter;
(2) measuring 200 mu L of hydrogen peroxide with the concentration of 30 wt%, dropwise adding the hydrogen peroxide into the water-based solution containing the graphene oxide nanosheets, continuously stirring in the dropwise adding process, continuously stirring for 20min after dropwise adding is completed, then performing ultrasonic dispersion for 10h, then performing centrifugal separation on the obtained solution for 30min at the speed of 2000rpm, and taking supernatant, namely the water-based lubricating liquid for oxidation treatment of the graphene oxide.
And (3) testing the friction performance of the obtained water-based lubricating liquid, specifically, testing by adopting a UMT-3 friction wear tester, wherein a rotation mode is adopted, a grinding ball is a silicon nitride small ball with the diameter of 4mm, a grinding pair is a sapphire glass sheet, the load is 2N, and the speed is 0.1 m/s. The change of the friction coefficient of the water-based lubricating fluid between the silicon nitride plane and the sapphire plane with time is shown in figure 2. As can be seen, the coefficient of friction of the water-based lubricating fluid gradually decreases with wear time, and after running and time, the coefficient is steadily less than 0.01, and the lowest coefficient of friction is about 0.0045.
Example 2
The water-based lubricating liquid consists of black phosphorus nanosheets, deionized water and hydrogen peroxide, and the preparation method comprises the following steps:
(1) weighing 100mg of black phosphorus nanosheet, adding the black phosphorus nanosheet into 20mL of deionized water, magnetically stirring for 20min, and then performing ultrasonic dispersion for 2h to prepare a water-based solution containing the black phosphorus nanosheet, wherein the thickness of the black phosphorus nanosheet is 10-30nm, and the diameter of the black phosphorus nanosheet is 0.5-30 mu m;
(2) measuring 20 mu L of hydrogen peroxide with the concentration of 30 wt%, dropwise adding the hydrogen peroxide into the water-based solution containing the black phosphorus nanosheets, continuously stirring in the dropwise adding process, continuously stirring for 20min after dropwise adding is completed, then carrying out ultrasonic dispersion for 1h, carrying out centrifugal separation on the obtained solution for 30min at the speed of 2000rpm, and taking supernatant, namely the water-based lubricating liquid for oxidizing the black phosphorus nanosheets.
And (3) testing the friction performance of the obtained water-based lubricating liquid, specifically, testing by adopting a UMT-3 friction wear tester, wherein a rotation mode is adopted, a grinding ball is a silicon nitride small ball with the diameter of 4mm, a grinding pair is a sapphire glass sheet, the load is 3N, and the speed is 0.1 m/s. The change of the friction coefficient of the water-based lubricating fluid between the silicon nitride plane and the sapphire plane with time is shown in figure 3. As can be seen, the coefficient of friction of the water-based lubricating fluid gradually decreases with wear time, and after running for a while, the coefficient is steadily less than 0.01, and the lowest coefficient of friction is about 0.0014.
Example 3
The water-based lubricating liquid consists of molybdenum disulfide nanosheets, deionized water and hydrogen peroxide, and the preparation method comprises the following steps:
(1) weighing 20mg of molybdenum disulfide nanosheet, adding the molybdenum disulfide nanosheet into 20mL of deionized water, magnetically stirring for 20min, and then performing ultrasonic dispersion for 2h to prepare a water-based solution containing the molybdenum disulfide nanosheet, wherein the molybdenum disulfide nanosheet is 5-15nm in thickness and 0.5-10 microns in diameter;
(2) measuring 200 mu L of hydrogen peroxide with the concentration of 30 wt%, dropwise adding the hydrogen peroxide into the water-based solution containing the molybdenum disulfide nanosheets, continuously stirring in the dropwise adding process, continuously stirring for 20min after dropwise adding is completed, then carrying out ultrasonic dispersion for 2h, carrying out centrifugal separation on the obtained solution for 30min at the speed of 2000rpm, and taking supernatant, namely the water-based lubricating liquid for oxidation treatment of molybdenum disulfide.
And (3) testing the friction performance of the obtained water-based lubricating liquid, specifically, testing by adopting a UMT-3 friction wear tester, wherein a rotation mode is adopted, a grinding ball is a silicon nitride small ball with the diameter of 4mm, a grinding pair is a sapphire glass sheet, the load is 2N, and the speed is 0.1 m/s. The change of the friction coefficient of the water-based lubricating fluid between the silicon nitride plane and the sapphire plane with time is shown in figure 4. As can be seen, the coefficient of friction of the water-based lubricating fluid gradually decreases with wear time, and after running for a while, the coefficient is steadily less than 0.01, and the lowest coefficient of friction is about 0.004.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (4)
1. A water-based lubricating fluid, comprising: the water-based lubricating fluid comprises water, an oxidant and a nano material, wherein the surface of the nano material after being oxidized by the oxidant contains hydrophilic functional groups, the oxidant is hydrogen peroxide, and the preparation method of the water-based lubricating fluid comprises the following steps:
(1) dispersing the nanomaterial in water to obtain a water-based solution containing the nanomaterial;
(2) mixing, stirring and dispersing an oxidant and the water-based solution containing the nano material, separating to obtain a water-based lubricating liquid,
in the step (1), the concentration of the nano material in the water-based solution containing the nano material is 0.1-10mg/mL,
in the step (2), the concentration of the oxidizing agent is 25-35 wt%, and the volume ratio of the oxidizing agent to the water-based solution containing the nano materials is 0.05-10: 100,
the nanometer material is black phosphorus nanometer particles and/or black phosphorus nanometer sheets, the size of the black phosphorus nanometer particles is 2-500nm, the thickness of the black phosphorus nanometer sheets is 1-50nm, and the diameter of the black phosphorus nanometer sheets is 0.2-100 mu m.
2. The water-based lubricating fluid of claim 1, wherein the dispersion in steps (1) and (2) is ultrasonic dispersion.
3. The water-based lubricating fluid according to claim 2, wherein the dispersion time in step (2) is 10-1200 min.
4. The water-based lubricating fluid according to claim 1, wherein in step (2), the separation is centrifugation at a rotation speed of 1000-.
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| CN110157516B (en) * | 2019-06-27 | 2021-11-23 | 合肥工业大学 | Nano titanium dioxide/black phosphorus nanosheet composite lubricant and preparation method thereof |
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