CN111073751A - Application of lubricating oil detergent dispersant in preparation of graphene - Google Patents
Application of lubricating oil detergent dispersant in preparation of graphene Download PDFInfo
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- CN111073751A CN111073751A CN201911295050.6A CN201911295050A CN111073751A CN 111073751 A CN111073751 A CN 111073751A CN 201911295050 A CN201911295050 A CN 201911295050A CN 111073751 A CN111073751 A CN 111073751A
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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
- C10M2201/041—Carbon; Graphite; Carbon black
- C10M2201/0413—Carbon; Graphite; Carbon black used as base material
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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
- C10M2217/00—Organic macromolecular compounds containing nitrogen as ingredients in lubricant compositions
- C10M2217/02—Macromolecular compounds obtained from nitrogen containing monomers by reactions only involving carbon-to-carbon unsaturated bonds
- C10M2217/024—Macromolecular compounds obtained from nitrogen containing monomers by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to an amido or imido group
Abstract
The invention relates to application of a lubricating oil detergent dispersant in preparation of graphene and a method for preparing graphene for lubricating oil by mechanical stripping. The preparation method comprises the following steps: s1, adding the clean lubricating oil dispersant into water, and mechanically stirring to obtain a mixed solution; s2, adding expanded graphite into the mixed solution, and mechanically stirring to obtain an expanded graphite aqueous dispersion liquid; s3, mechanically stripping the expanded graphite aqueous dispersion to obtain a graphene aqueous dispersion; s4 graphene for lubricating oil is obtained from the aqueous graphene dispersion. The method utilizes the clean dispersant of the lubricating oil as the dispersant of the expanded graphite, prepares the graphene for the lubricating oil by mechanical stripping, and has the characteristics of high efficiency, low cost, high product yield and high quality.
Description
Technical Field
The invention relates to preparation of a graphene material, in particular to application of a lubricating oil detergent dispersant in preparation of graphene and a method for preparing graphene for lubricating oil by mechanical stripping.
Background
Graphene as a newly developed two-dimensional material has a plurality of excellent properties, and is widely developed and applied in the fields of composite materials, textiles, sensing, energy sources and the like. The further development of graphene materials is limited by the deficiency of graphene in the aspect of efficient and high-quality preparation, and how to efficiently prepare high-quality graphene becomes a research hotspot.
In the existing method, a Chemical Vapor Deposition (CVD) method is a method capable of preparing high-quality single-layer graphene, but the CVD method is difficult to produce graphene in batches due to high preparation cost; the redox method is a common method for preparing graphene in batches, but the prepared graphene has many defects and low quality. The mechanical stripping method is a simple and common method for preparing high-quality graphene, but the graphene is hydrophobic, so that the graphene can be dispersed in an aqueous solution by adding a large amount of dispersant, and most of the dispersant is difficult to remove, so that the application of the graphene material is influenced. Chinese patent CN105502357A, "a special stripping agent for preparing graphene by mechanical stripping and a preparation method" uses deionized water as a solvent to add a dispersant to treat graphite, and a complex stripping agent needs to be added in the mechanical stripping process, and the stripping agent needs to be prepared additionally, which increases the preparation cost of graphene; chinese patent No. CN107628610A, "a method for preparing graphene and graphene conductive liquid by mechanical exfoliation," uses deionized water to add a dispersant to treat graphite, and performs high-pressure homogenization treatment to obtain graphene aqueous dispersion, but carbon dioxide needs to be introduced under pressure before homogenization treatment, and ultrasonic treatment is needed to assist exfoliation after homogenization treatment, thereby greatly increasing preparation time and increasing preparation cost; chinese patent No. CN104495826A, "single-layer graphene dispersion liquid and preparation method thereof," uses expanded graphite added with dispersant to prepare single-layer graphene in water or organic solvent, but the expansion process of expanded graphite (oxidation-high temperature reduction-reoxidation-high temperature reduction) is very complicated, and the amount of dispersant used is large, which is not favorable for batch preparation and application of graphene. Therefore, a dispersant capable of obviously improving the efficiency of preparing graphene by mechanical stripping and the product quality is needed, so that the addition amount of the dispersant is small, complicated treatment of raw materials or addition of a stripping agent is not needed, and the prepared graphene has good performance and a good application prospect.
Mono-alkenyl succinimide (T151), polyisobutenyl succinimide (T154), polyisobutenyl polysuccinimide (T155) and high molecular weight polyisobutenyl succinimide (T161) are polyisobutenyl succinimide derivatives, which are mainly used as ashless detergent dispersants for lubricating oils at present. At present, no prior art discloses that the ashless clean dispersant for the lubricating oil is used as a dispersant in the process of preparing graphene by mechanical stripping.
Disclosure of Invention
Aiming at the problems in the existing graphene preparation by mechanical stripping, the invention aims to provide the application of the lubricating oil detergent dispersant in the preparation of graphene. The lubricating oil detergent dispersant plays a role of a dispersant in the process of preparing graphene, the dosage is small, complex treatment of raw materials or addition of a stripping agent is not needed, and the prepared graphene is good in performance.
In a preferred embodiment, in the use of the detergent dispersant for lubricating oils of the present invention in the preparation of graphene, the detergent dispersant for lubricating oils is a polyisobutenyl succinimide derivative selected from one or more of the following: mono alkenyl succinimide, polyisobutenyl succinimide, polyisobutylene polysuccinimide, high molecular weight polyisobutenyl succinimide.
In a preferred embodiment, in the application of the lubricating oil detergent dispersant in preparing graphene, the raw material for preparing graphene is expanded graphite. More preferably, the volume factor of the expanded graphite is 100-300 times of that of the original graphite.
In a preferred embodiment, in the application of the clean dispersant for the lubricating oil in preparing the graphene, the clean dispersant for the lubricating oil is a polyisobutenyl succinimide derivative, the amount of the polyisobutenyl succinimide derivative is 0.1-5% of the amount of the expanded graphite, and more preferably, the amount of the polyisobutenyl succinimide derivative is 2-3% of the amount of the expanded graphite.
In a preferred embodiment, in the use of the lubricating oil detergent dispersant of the present invention in the preparation of graphene, the expanded graphite is thermally expanded graphite. More preferably, the expanded graphite is prepared by strong acid treatment, water washing and drying and high-temperature expansion.
The invention also provides a method for preparing graphene for lubricating oil by mechanical stripping, which comprises the following steps:
s1, adding the clean lubricating oil dispersant into water, and mechanically stirring to obtain a mixed solution;
s2, adding expanded graphite into the mixed solution, and mechanically stirring to obtain an expanded graphite aqueous dispersion liquid;
s3, mechanically stripping the expanded graphite aqueous dispersion liquid to obtain a graphene aqueous dispersion liquid;
and S4, obtaining the graphene for the lubricating oil from the graphene aqueous dispersion liquid.
In a preferred embodiment, in the method for preparing graphene for lubricating oil by mechanical stripping of the invention, the lubricating oil detergent dispersant is a polyisobutenyl succinimide derivative selected from one or more of the following: monoalkenyl succinimide (T151), polyisobutenyl succinimide (T154), polyisobutylene polysuccinimide (T155), high molecular weight polyisobutenyl succinimide (T161). More preferably, the polyisobutenyl succinimide derivative is T154.
In a preferred embodiment, in the method for preparing graphene for lubricating oil by mechanical stripping of the invention, the volume factor of the expanded graphite is 100-300 times that of the original graphite.
In a preferred embodiment, in the method for preparing graphene for lubricating oil by mechanical stripping, the detergent dispersant for lubricating oil is a polyisobutenyl succinimide derivative, and the amount of the polyisobutenyl succinimide derivative is 0.1-5% of the amount of the expanded graphite. More preferably, the amount of the polyisobutenyl succinimide derivative is 2-3% of the amount of the expanded graphite.
In a preferred embodiment, in the method for preparing graphene for lubricating oil by mechanical exfoliation according to the present invention, the equipment used for the mechanical exfoliation is selected from at least one of the following: colloid mill equipment, sanding equipment, high pressure homogeneity equipment, emulsion machine, little efflux equipment. More preferably, the apparatus used for said mechanical stripping is a high pressure homogenisation apparatus.
In a preferred embodiment, in step S4 of the method for preparing graphene for lubricating oil by mechanical exfoliation according to the present invention, the graphene aqueous dispersion is spray-dried or filtered to obtain graphene for lubricating oil. In a preferred embodiment, the spray drying is carried out at a temperature of from 100 ℃ to 150 ℃.
In a preferred embodiment, in step S1 of the method for preparing graphene for lubricating oil by mechanical exfoliation according to the present invention, the water is deionized water or distilled water.
In a preferred embodiment, in the method for preparing graphene for lubricating oil by mechanical stripping according to the present invention, the expanded graphite is thermally expanded graphite prepared by strong acid treatment, water washing and drying, and high temperature expansion.
The invention also provides the graphene for the lubricating oil prepared by the method. The radial size of the graphene is less than 5 mu m, and the average layer number is less than 10.
The clean dispersant for the lubricating oil is used in the process of preparing the graphene by mechanical stripping for the first time, and the clean dispersant for the lubricating oil is used as the dispersant in the process of preparing the graphene, so that expanded graphite serving as a raw material for preparing the graphene is better dispersed in water, and the prepared graphene can be directly applied to lubrication, so that the oxidation resistance of the lubricating oil is enhanced, the formation of carbon deposit, paint film or oil sludge is reduced, the internal cleanness of an engine is kept, and the service life of the lubricating oil is prolonged.
According to the method for preparing the graphene for the lubricating oil by mechanical stripping, the characteristics of loose stacking structure, low interlaminar acting force and large volume and specific surface area of the raw material expanded graphite are utilized, the expanded graphite can be uniformly dispersed in an aqueous solvent by mechanical stirring only by a small amount of lubricating oil detergent dispersant, and an intercalator and a stripping aid are not required to be added, so that the graphene aqueous dispersion liquid is obtained after the mechanical stripping treatment of the expanded graphite aqueous dispersion liquid. Meanwhile, the graphene prepared by adding the lubricating oil detergent dispersant can be directly applied to the lubricating oil, so that the oxidation resistance of the lubricating oil is enhanced, the formation of carbon deposit, paint film or oil sludge is reduced, the internal cleanness of the engine is kept, and the service life of the lubricating oil is prolonged.
The method for preparing the graphene by mechanical stripping by taking the expanded graphite as the raw material and adding a small amount of the lubricating oil detergent dispersant as the dispersant has the characteristics of small dispersant dosage, high production efficiency, low cost, high product yield, high quality and the like. The raw material expanded graphite has wide sources and low price, the preparation operation flow is simple, and the method for preparing graphene by mechanical stripping has the advantages of low production cost, high production efficiency and convenience for large-scale industrial production.
Drawings
Fig. 1 is a scanning electron microscope image (SEM) of graphene according to example 1 of the present invention.
Fig. 2a and 2b are transmission electron microscope images (TEMs) of different magnifications of graphene according to example 1 of the present invention, respectively.
Detailed Description
In step S3 of the method for preparing graphene for lubricating oil by mechanical stripping according to the present invention, the mechanical stripping equipment includes, but is not limited to, one or more of colloid milling equipment, sanding equipment, high-pressure homogenizing equipment, emulsifying machine, and micro-jet equipment.
In the present description, "lubricant detergent dispersant" is a polyisobutenyl succinimide derivative including, but not limited to, monoalkenyl succinimide (T151), polyisobutenyl succinimide (T154), polyisobutenyl polysuccinimide (T155), and high molecular weight polyisobutenyl succinimide (T161).
In the description of the present invention, "plural" means two or more.
In the description of the present invention, "expanded graphite" may be obtained by any method known in the art, that is, expanded graphite prepared by any method may be suitably used in the present invention. For example, the expanded graphite of the present invention can be obtained by intercalating natural crystalline flake graphite, filtering, washing with water, drying, and puffing at high temperature.
In the description of the present invention, "normal temperature" means 25 ℃.
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. The experimental procedures, for which specific conditions are not indicated in the following examples, are generally carried out under conventional conditions, or under conditions recommended by the manufacturer. Percentages are by weight unless otherwise indicated.
The scanning electron microscope used in the following examples was manufactured by Tessincon (China) Inc. under the model MIRA3, and the transmission electron microscope was manufactured by Hitachi under the model H-8100 EM.
Reference to "20%" of the lubricant dispersion in the following examples refers to an aqueous solution having a solids content of 20%, for example, "T154 emulsion (20%)", "T151 emulsion (20%)" and "T155 emulsion (20%)" etc. refer to an aqueous solution of T154, T151 and T155 containing 20% of T154, T151 and T155.
The temperature of spray drying used in the following examples was from 100 ℃ to 150 ℃. More preferably, the temperature is 120 ℃.
The expanded graphite used in the following examples is Qingdao Rizhi graphite, Inc.
Example 1
5g of the T154 emulsion (20%) is put into 955ml deionized water, mechanically stirred for 20min at normal temperature, then 40g of expanded graphite (325 mesh, 95-99 fixed carbon-200 type) with the expansion multiple of 200 is put into the mixture, and stirred for 30min at normal temperature to obtain the expanded graphite aqueous dispersion liquid.
And (3) treating the expanded graphite aqueous dispersion liquid for 7 hours by using high-pressure homogenizing equipment (the temperature of the high-pressure homogenizing treatment is room temperature, and the rotating speed is 2000rpm) to obtain a graphene aqueous dispersion liquid, and performing spray drying (120 ℃) to obtain the graphene for the lubricating oil.
The obtained graphene was observed by a scanning electron microscope and a transmission electron microscope to obtain a scanning electron microscope image (SEM) shown in fig. 1 and a transmission electron microscope image (TEM) shown in fig. 2. These images show that the graphene obtained by this method has a radial dimension of less than 5 μm and an average number of layers of 8.9. After the graphene is added into lubricating oil, the oxidation resistance of the lubricating oil is improved, and the T154 serving as an ashless clean dispersant has good dispersibility, so that the formation of carbon deposit, paint film or oil sludge is reduced, the internal cleanness of an engine is kept, and the service life of the lubricating oil is prolonged.
Example 2
5g of the T154 emulsion (20%) is put into 955ml deionized water, mechanically stirred for 20min at normal temperature, then 40g of expanded graphite (325 mesh, 95-99 fixed carbon-300 type) with the expansion multiple of 300 is put into the mixture, and stirred for 30min at normal temperature to obtain the expanded graphite aqueous dispersion liquid.
And (3) treating the expanded graphite aqueous dispersion liquid for 7 hours by using high-pressure homogenizing equipment (the temperature of the high-pressure homogenizing treatment is room temperature, and the rotating speed is 2000rpm) to obtain a graphene aqueous dispersion liquid, and performing spray drying (150 ℃) to obtain the graphene for the lubricating oil.
And observing the obtained graphene by using a scanning electron microscope and a transmission electron microscope, wherein the obtained results of the scanning electron microscope and the transmission electron microscope show that the radial size of the graphene obtained by the method is less than 5 mu m, and the average number of layers is 8.4. After the graphene is added into lubricating oil, the oxidation resistance of the lubricating oil is improved, and the T154 serving as an ashless clean dispersant has good dispersibility, so that the formation of carbon deposit, paint film or oil sludge is reduced, the internal cleanness of an engine is kept, and the service life of the lubricating oil is prolonged.
Example 3
Adding 6g T151 emulsion (20%) into 955ml deionized water, mechanically stirring at room temperature for 20min, adding 40g expanded graphite (325 mesh, 95-99 fixed carbon-300) with expansion multiple of 300, and stirring at room temperature for 30min to obtain expanded graphite aqueous dispersion.
And (3) treating the expanded graphite aqueous dispersion liquid for 7 hours by using sanding equipment (the temperature of the sanding equipment is room temperature, and the rotating speed is 2000rpm) to obtain a graphene aqueous dispersion liquid, and performing spray drying (140 ℃) to obtain the graphene for the lubricating oil.
And observing the obtained graphene by using a scanning electron microscope and a transmission electron microscope, wherein the obtained results of the scanning electron microscope and the transmission electron microscope show that the radial size of the graphene obtained by the method is less than 5 mu m, and the average number of layers is 8.7. After the graphene is added into lubricating oil, the oxidation resistance of the lubricating oil is improved, and the T151 serving as an ashless clean dispersant has good dispersibility, so that the formation of carbon deposit, paint film or oil sludge is reduced, the internal cleanness of an engine is kept, and the service life of the lubricating oil is prolonged.
Example 4
5g of the T155 emulsion (20%) is put into 955ml deionized water, mechanically stirred for 20min at normal temperature, then 40g of expanded graphite (325 mesh, 95-99 fixed carbon-300) with the expansion multiple of 300 is put into the mixture, and stirred for 30min at normal temperature to obtain the expanded graphite aqueous dispersion liquid.
And (3) treating the expanded graphite aqueous dispersion liquid for 7 hours by using colloid mill equipment (the treatment temperature of the colloid mill equipment is room temperature, and the rotating speed is 2000rpm) to obtain a graphene aqueous dispersion liquid, and filtering and drying to obtain the graphene for the lubricating oil.
And observing the obtained graphene by using a scanning electron microscope and a transmission electron microscope, wherein the obtained results of the scanning electron microscope and the transmission electron microscope show that the radial size of the graphene obtained by the method is less than 5 mu m, and the average number of layers is 9.2. After the graphene is added into lubricating oil, the oxidation resistance of the lubricating oil is improved, and the T161 serving as an ashless clean dispersant has good dispersibility, so that the formation of carbon deposit, paint film or oil sludge is reduced, the internal cleanness of an engine is kept, and the service life of the lubricating oil is prolonged.
Example 5
5g of the T161 emulsion (20%) is put into 955ml deionized water, mechanically stirred for 20min at normal temperature, then 40g of expanded graphite (325 mesh, 95-99 fixed carbon-300 type) with the expansion multiple of 300 is put into the mixture, and stirred for 30min at normal temperature to obtain the expanded graphite aqueous dispersion liquid.
And (3) treating the expanded graphite aqueous dispersion liquid for 7 hours by using an emulsifying machine (the treatment temperature of the emulsifying machine is room temperature, and the rotation speed is 2000rpm) to obtain a graphene aqueous dispersion liquid, and filtering and drying to obtain the graphene for the lubricating oil.
And observing the obtained graphene by using a scanning electron microscope and a transmission electron microscope, wherein the obtained results of the scanning electron microscope and the transmission electron microscope show that the radial size of the graphene obtained by the method is less than 5 mu m, and the average number of layers is 8.4. After the graphene is added into lubricating oil, the oxidation resistance of the lubricating oil is improved, and the T164 serving as an ashless clean dispersant has good dispersibility, so that the formation of carbon deposit, paint film or oil sludge is reduced, the internal cleanness of an engine is kept, and the service life of the lubricating oil is prolonged.
Example 6
5g of the mixed emulsion (20%) of T154 and T155 was put into 955ml of deionized water (the mixing ratio of T154 and T155 was 1: 1), mechanically stirred at room temperature for 20 minutes, then 40g of expanded graphite (325 mesh, type 95-99 fixed carbon-300) having an expansion factor of 300 was put in, and stirred at room temperature for 30 minutes to obtain an expanded graphite aqueous dispersion.
And (3) treating the expanded graphite aqueous dispersion liquid for 7 hours by using a micro-jet device (the temperature for treating by using the micro-jet device is room temperature, and the rotating speed is 2000rpm) to obtain a graphene aqueous dispersion liquid, and filtering and drying to obtain the graphene for the lubricating oil.
And (3) observing the obtained graphene after drying by using a scanning electron microscope and a transmission electron microscope, wherein the obtained results of the scanning electron microscope and the transmission electron microscope show that the radial size of the graphene obtained by the method is less than 5 mu m, and the average number of layers is 8.5. After the graphene is added into lubricating oil, the oxidation resistance of the lubricating oil is improved, and the T164 serving as an ashless clean dispersant has good dispersibility, so that the formation of carbon deposit, paint film or oil sludge is reduced, the internal cleanness of an engine is kept, and the service life of the lubricating oil is prolonged.
Example 7
5g of the mixed emulsion (20%) of T151 and T154 was put into 955ml of deionized water (the mixing ratio of T151 and T154 was 1: 6), mechanically stirred at room temperature for 20 minutes, then 40g of expanded graphite (325 mesh, type 95-99 fixed carbon-300) having an expansion factor of 300 was put in, and stirred at room temperature for 30 minutes to obtain an expanded graphite aqueous dispersion.
And (3) treating the expanded graphite aqueous dispersion liquid for 3 hours by using a sanding device, treating for 3 hours by using a colloid mill device (the temperature of the sanding device and the colloid mill device is room temperature, and the rotating speed is 2000rpm) to obtain a graphene aqueous dispersion liquid, and spray drying (150 ℃) to obtain the graphene for lubricating oil.
And observing the obtained graphene by using a scanning electron microscope and a transmission electron microscope, wherein the obtained results of the scanning electron microscope and the transmission electron microscope show that the radial size of the graphene obtained by the method is less than 5 mu m, and the average number of layers is 8.6. After the graphene is added into lubricating oil, the oxidation resistance of the lubricating oil is improved, and the T165 serving as an ashless clean dispersant has good dispersibility, so that the formation of carbon deposit, paint film or oil sludge is reduced, the internal cleanness of an engine is kept, and the service life of the lubricating oil is prolonged.
Comparative example 1
The difference from example 1 is that unexpanded graphite (natural flake graphite) was used as a raw material.
The method comprises the following specific steps:
5g of the T154 emulsion (20%) was put into 955ml of deionized water, and after mechanical stirring at room temperature for 20 minutes, 40g of unexpanded graphite was put into the mixture, and after stirring at room temperature for 30 minutes, the unexpanded graphite was difficult to be uniformly dispersed in the mixture of the dispersant and water, and it was difficult to perform homogenization treatment.
The results show that the expansion treatment is a key link for enabling the graphite to be uniformly dispersed in the aqueous solution under the condition of using a small amount of the dispersing agent.
Comparative example 2
5g of polyvinylpyrrolidone emulsion (20%) is put into 955ml of deionized water, mechanically stirred for 20min at normal temperature, then 40g of expanded graphite (325 mesh, 95-99 fixed carbon-200 type) with the expansion multiple of 200 is put into the mixture, and stirred for 30min at normal temperature to obtain the expanded graphite aqueous dispersion liquid.
And (3) treating the graphene by using high-pressure homogenizing equipment for 7 hours to obtain graphene aqueous dispersion, and performing spray drying or filtering to obtain graphene.
And observing the obtained graphene by using a scanning electron microscope and a transmission electron microscope, wherein the obtained results of the scanning electron microscope and the transmission electron microscope show that the radial size of the graphene obtained by the method is less than 5 mu m, and the average layer number is 13.4. After the graphene is added into the lubricating oil, the oxidation resistance of the lubricating oil cannot be effectively improved due to the high number of graphene layers, and the formation of carbon deposit, paint film or oil sludge cannot be reduced due to the polyvinylpyrrolidone, so that the internal cleanness of an engine cannot be kept to improve the service life of the lubricating oil.
Comparative example 3
5g of polyvinyl alcohol was added to 955ml of deionized water, followed by mechanical stirring for 20 minutes, 40g of expanded graphite (325 mesh) having an expansion factor of 300 was added, and the mixture was stirred for 30 minutes to obtain an aqueous expanded graphite dispersion.
And (3) treating the graphene by using high-pressure homogenizing equipment for 7 hours to obtain a graphene aqueous dispersion, and spray drying or filtering to obtain the wet graphene.
And observing the obtained graphene by using a scanning electron microscope and a transmission electron microscope, wherein the obtained results of the scanning electron microscope and the transmission electron microscope show that the radial size of the graphene obtained by the method is less than 5 mu m, and the average number of layers is 12.4. After the graphene is added into the lubricating oil, the oxidation resistance of the lubricating oil cannot be effectively improved due to the high number of graphene layers, and the formation of carbon deposit, paint film or oil sludge cannot be reduced due to the polyvinyl alcohol, so that the internal cleanness of an engine cannot be kept to prolong the service life of the lubricating oil.
The above embodiments are merely preferred embodiments of the present invention, which are not intended to limit the scope of the present invention, and various changes may be made in the above embodiments of the present invention. All simple and equivalent changes and modifications made according to the claims and the content of the specification of the present application fall within the scope of the claims of the present patent application. The invention has not been described in detail in order to avoid obscuring the invention.
Claims (10)
1. Application of a lubricating oil detergent dispersant in preparation of graphene.
2. The use according to claim 1, wherein the detergent dispersant for lubricating oils is a polyisobutenyl succinimide derivative selected from one or more of the following:
mono alkenyl succinimide, polyisobutenyl succinimide, polyisobutylene polysuccinimide, high molecular weight polyisobutenyl succinimide.
3. The use according to claim 1, characterized in that the raw material for preparing the graphene by mechanical exfoliation is expanded graphite.
4. Use according to claim 3, wherein the expanded graphite is 100-300 times the volume of the original graphite.
5. The method for preparing graphene for lubricating oil by mechanical stripping is characterized by comprising the following steps:
s1, adding the clean lubricating oil dispersant into water, and mechanically stirring to obtain a mixed solution;
s2, adding expanded graphite into the mixed solution, and mechanically stirring to obtain an expanded graphite aqueous dispersion liquid;
s3, mechanically stripping the expanded graphite aqueous dispersion liquid to obtain a graphene aqueous dispersion liquid;
and S4, obtaining the graphene for the lubricating oil from the graphene aqueous dispersion liquid.
6. The method of claim 5, wherein the detergent dispersant for lubricating oil is a polyisobutenyl succinimide derivative selected from one or more of the following:
mono alkenyl succinimide, polyisobutenyl succinimide, polyisobutylene polysuccinimide, high molecular weight polyisobutenyl succinimide.
7. The method as claimed in claim 5, wherein the expanded graphite is 100-300 times the volume of the original graphite.
8. The preparation method of claim 5, wherein the amount of the detergent dispersant for lubricating oil is 0.1-5% of the amount of the expanded graphite.
9. The production method according to claim 5, wherein an apparatus for the mechanical peeling is selected from at least one of the following apparatuses: colloid mill equipment, sanding equipment, high pressure homogeneity equipment, emulsion machine, little efflux equipment.
10. The method according to claim 5, wherein in step S4, the graphene aqueous dispersion is spray-dried or filtered to obtain graphene for lubricating oil.
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Address after: Room j653, building 6, 1288 Yecheng Road, Jiading District, Shanghai, 201822 Applicant after: Zhongke Yueda (Shanghai) material technology Co.,Ltd. Address before: 201822 J3330 room 912, Yecheng Road, Jiading Industrial Zone, Jiading District, Shanghai. Applicant before: Shanghai Ewang Material Technology Co.,Ltd. |
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Application publication date: 20200428 |