CN111286392A - High-wear-resistance graphene lubricating oil and production process thereof - Google Patents
High-wear-resistance graphene lubricating oil and production process 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
- 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
- C10M169/044—Mixtures of base-materials and additives the additives being a mixture of non-macromolecular and macromolecular compounds
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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
- C10M177/00—Special methods of preparation of lubricating compositions; Chemical modification by after-treatment of components or of the whole of a lubricating composition, not covered by other classes
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- 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
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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
- C10M2201/06—Metal compounds
- C10M2201/061—Carbides; Hydrides; Nitrides
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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
- C10M2201/06—Metal compounds
- C10M2201/062—Oxides; Hydroxides; Carbonates or bicarbonates
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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
- C10M2201/14—Inorganic compounds or elements as ingredients in lubricant compositions inorganic compounds surface treated with organic compounds
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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
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/10—Carboxylix acids; Neutral salts thereof
- C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
- C10M2207/121—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of seven or less carbon atoms
- C10M2207/124—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of seven or less carbon atoms containing hydroxy groups; Ethers thereof
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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
- C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
- C10M2215/086—Imides
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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
- C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
- C10M2215/28—Amides; Imides
-
- 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
- C10M2217/04—Macromolecular compounds from nitrogen-containing monomers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C10M2217/046—Polyamines, i.e. macromoleculars obtained by condensation of more than eleven amine monomers
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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
- C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
- C10M2219/04—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions containing sulfur-to-oxygen bonds, i.e. sulfones, sulfoxides
- C10M2219/044—Sulfonic acids, Derivatives thereof, e.g. neutral salts
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- 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
- C10M2229/00—Organic macromolecular compounds containing atoms of elements not provided for in groups C10M2205/00, C10M2209/00, C10M2213/00, C10M2217/00, C10M2221/00 or C10M2225/00 as ingredients in lubricant compositions
- C10M2229/04—Siloxanes with specific structure
- C10M2229/041—Siloxanes with specific structure containing aliphatic substituents
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- Chemical & Material Sciences (AREA)
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- Oil, Petroleum & Natural Gas (AREA)
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Abstract
The invention discloses high-wear-resistance graphene lubricating oil and a production process thereof, wherein the high-wear-resistance graphene lubricating oil is prepared from the following components in parts by weight: 90-100 parts of base oil, 3.5-4.5 parts of nano graphene, 2-5 parts of polyaniline grafted graphene, 1-3 parts of nano zinc oxide, 2-5 parts of aluminum nitride, 0.3-0.8 part of simethicone, 0.4-0.7 part of sorbitan fatty acid ester, 0.3-0.8 part of sodium citrate, 0.2-0.5 part of sodium alkyl benzene sulfonate and 0.2-0.5 part of polyisobutylene succinimide. The preparation method is simple in preparation process and low in preparation cost, and can be used for large-batch industrial production; the prepared high-wear-resistance graphene lubricating oil is uniform and stable in dispersion, has good lubricating performance and cannot cause any pollution to the environment.
Description
Technical Field
The invention relates to the technical field of graphene lubricating oil, in particular to high-wear-resistance graphene lubricating oil and a production process thereof.
Background
Lubricating oil is a common chemical auxiliary agent in industry and machinery, mechanical workpieces can run better and smoothly under the action of the lubricating oil, the working efficiency is improved, along with the high-speed development of the industrial society, a large amount of resources and energy are consumed by the friction and abrasion of machine equipment parts, the common lubricating oil in the market at present is poor in abrasion resistance, the lubricating oil with good abrasion resistance effect is the lubricating oil added with fluoride, but the fluoride has certain pollution to the environment, so that the existing market is lack of products which are environment-friendly, abrasion-resistant and long in service life.
Graphene is composed of a layer of dense carbon atoms on a crystal lattice, the thickness of the graphene is only 0.35nm, the graphene is the thinnest two-dimensional material in the world, the graphene is also used as a lubricating material due to excellent mechanical properties of the graphene, the graphene can be used as a lubricating oil additive, if the graphene lubricating oil is added into mechanical equipment to show good lubricating properties, the graphene lubricating oil must be stably dispersed in the lubricating oil, the dispersibility and the stability of the graphene are very important, and besides, the dispersion stability of the graphene lubricating oil in the prior art is insufficient, so that the actual requirements in modern industrial production are difficult to meet.
Therefore, the high-wear-resistance graphene lubricating oil and the production process thereof provided by the invention can provide the high-wear-resistance graphene lubricating oil with good lubricating property, high stability and excellent lubricating property, and have very important industrial application value.
Disclosure of Invention
In order to solve the problems in the prior art, improve the dispersion stability of graphene in the graphene lubricating oil and improve the integral lubricating wear-resisting property of the lubricating oil, the invention provides the high-wear-resisting graphene lubricating oil and a production process thereof.
The technical scheme adopted by the invention for solving the technical problems is as follows: the high-wear-resistance graphene lubricating oil is prepared from the following components in parts by weight:
the production process of the high-wear-resistance graphene lubricating oil comprises the following steps:
step one, preparing a mixture A: adding the nano graphene, the polyaniline grafted graphene and the nano zinc oxide into high-shear mixing equipment according to the weight parts, and uniformly stirring and mixing to obtain a mixture A;
step two, preparing a mixture B: adding sodium citrate, sodium alkyl benzene sulfonate, aluminum nitride and sorbitan fatty acid ester into high-speed stirring and mixing equipment according to the parts by weight, and uniformly stirring and mixing to obtain a mixture B;
step three, preparing a mixed solution C: stirring and mixing the dimethyl silicone oil and the polyisobutylene succinimide in the weight part ratio to obtain a mixed solution C;
step four, preparing the graphene lubricating oil: adding the mixed solution C into base oil, stirring for 10-15 min at the temperature of 25-35 ℃, sequentially adding the mixed solution A and the mixed solution B into the mixed system, and shearing and mixing at 2000-3000 r/min for 40-60 min to obtain the high-wear-resistance graphene lubricating oil.
According to the high-wear-resistance graphene lubricating oil and the production process thereof, the average particle size of the nano graphene is 30-100 nm.
According to the high-wear-resistance graphene lubricating oil and the production process thereof, the average particle size of the nano zinc oxide is 80-200 nm.
Compared with the prior art, the invention provides the following beneficial effects:
1. the polyaniline grafted graphene can effectively improve the dispersion performance of the polyaniline grafted graphene in base oil, and cannot generate any agglomeration or sedimentation;
2. by adding nano graphene with smaller particle size, gaps among polyaniline grafted graphene can be effectively filled, so that the graphene is more uniformly and densely distributed in the base solution;
3. the preparation process is simple, the preparation cost is low, and reproducible large-scale industrial production can be carried out;
4. the prepared high-wear-resistance graphene lubricating oil is uniform and stable in dispersion, has good lubricating performance and cannot cause any pollution to the environment.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be described in detail below with reference to specific embodiments and related experimental data.
[ example 1 ]
The high-wear-resistance graphene lubricating oil is prepared from the following components in parts by weight:
the production process of the high-wear-resistance graphene lubricating oil comprises the following steps:
step one, preparing a mixture A: adding the nano graphene, the polyaniline grafted graphene and the nano zinc oxide into high-shear mixing equipment according to the weight parts, and uniformly stirring and mixing to obtain a mixture A;
step two, preparing a mixture B: adding sodium citrate, sodium alkyl benzene sulfonate, aluminum nitride and sorbitan fatty acid ester into high-speed stirring and mixing equipment according to the parts by weight, and uniformly stirring and mixing to obtain a mixture B;
step three, preparing a mixed solution C: stirring and mixing the dimethyl silicone oil and the polyisobutylene succinimide in the weight part ratio to obtain a mixed solution C;
step four, preparing the graphene lubricating oil: adding the mixed solution C into base oil, stirring for 15min at the temperature of 25 ℃, sequentially adding the mixed solution A and the mixed solution B into the mixed system, and shearing and mixing at 2000r/min for 60min to obtain the high-wear-resistance graphene lubricating oil.
Further, the average particle size of the nano graphene is 30 nm.
Further, the average particle size of the nano zinc oxide is 80 nm.
[ example 2 ]
The high-wear-resistance graphene lubricating oil is prepared from the following components in parts by weight:
the production process of the high-wear-resistance graphene lubricating oil comprises the following steps:
step one, preparing a mixture A: adding the nano graphene, the polyaniline grafted graphene and the nano zinc oxide into high-shear mixing equipment according to the weight parts, and uniformly stirring and mixing to obtain a mixture A;
step two, preparing a mixture B: adding sodium citrate, sodium alkyl benzene sulfonate, aluminum nitride and sorbitan fatty acid ester into high-speed stirring and mixing equipment according to the parts by weight, and uniformly stirring and mixing to obtain a mixture B;
step three, preparing a mixed solution C: stirring and mixing the dimethyl silicone oil and the polyisobutylene succinimide in the weight part ratio to obtain a mixed solution C;
step four, preparing the graphene lubricating oil: adding the mixed solution C into base oil, stirring for 12min at the temperature of 30 ℃, sequentially adding the mixed solution A and the mixed solution B into the mixed system, and shearing and mixing at 2500r/min for 50min to obtain the high-wear-resistance graphene lubricating oil.
Further, the average particle size of the nano graphene is 65 nm.
Further, the average particle size of the nano zinc oxide is 140 nm.
[ example 3 ]
The high-wear-resistance graphene lubricating oil is prepared from the following components in parts by weight:
the production process of the high-wear-resistance graphene lubricating oil comprises the following steps:
step one, preparing a mixture A: adding the nano graphene, the polyaniline grafted graphene and the nano zinc oxide into high-shear mixing equipment according to the weight parts, and uniformly stirring and mixing to obtain a mixture A;
step two, preparing a mixture B: adding sodium citrate, sodium alkyl benzene sulfonate, aluminum nitride and sorbitan fatty acid ester into high-speed stirring and mixing equipment according to the parts by weight, and uniformly stirring and mixing to obtain a mixture B;
step three, preparing a mixed solution C: stirring and mixing the dimethyl silicone oil and the polyisobutylene succinimide in the weight part ratio to obtain a mixed solution C;
step four, preparing the graphene lubricating oil: adding the mixed solution C into base oil, stirring for 13min at the temperature of 28 ℃, sequentially adding the mixed solution A and the mixed solution B into the mixed system, and shearing and mixing at 2800r/min and 45min to obtain the high-wear-resistance graphene lubricating oil.
Further, the average particle size of the nano graphene is 80 nm.
Further, the average particle size of the nano zinc oxide is 90 nm.
[ example 4 ]
The high-wear-resistance graphene lubricating oil is prepared from the following components in parts by weight:
the production process of the high-wear-resistance graphene lubricating oil comprises the following steps:
step one, preparing a mixture A: adding the nano graphene, the polyaniline grafted graphene and the nano zinc oxide into high-shear mixing equipment according to the weight parts, and uniformly stirring and mixing to obtain a mixture A;
step two, preparing a mixture B: adding sodium citrate, sodium alkyl benzene sulfonate, aluminum nitride and sorbitan fatty acid ester into high-speed stirring and mixing equipment according to the parts by weight, and uniformly stirring and mixing to obtain a mixture B;
step three, preparing a mixed solution C: stirring and mixing the dimethyl silicone oil and the polyisobutylene succinimide in the weight part ratio to obtain a mixed solution C;
step four, preparing the graphene lubricating oil: adding the mixed solution C into base oil, stirring for 15min at the temperature of 25 ℃, sequentially adding the mixed solution A and the mixed solution B into the mixed system, and shearing and mixing at 3000r/min for 40min to obtain the high-wear-resistance graphene lubricating oil.
Further, the average particle size of the nano graphene is 100 nm.
Further, the average particle size of the nano zinc oxide is 200 nm.
The performance of the lubricating oil obtained in the examples 1-4 is tested, the test results are shown in the following table 1, and the lubricating oil is compared with the base oil of the comparative example 1 without adding nano graphene, and the lubricating oil of the comparative example 2 without adding nano graphene and polyaniline grafted graphene, wherein the comparative examples 1 and 1 are a group of control groups, and the comparative examples 2 and 2 are a group of control groups;
TABLE 1 Table of Performance parameters of lubricating oils prepared in examples
The high-wear-resistance graphene lubricating oil is prepared from the following components in parts by weight: 90 parts of base oil, 2 parts of polyaniline grafted graphene, 1 part of nano zinc oxide, 2 parts of aluminum nitride, 0.3 part of dimethyl silicone oil, 0.4 part of sorbitan fatty acid ester, 0.3 part of sodium citrate, 0.2 part of sodium alkyl benzene sulfonate and 0.2 part of polyisobutylene succinimide; the production process of the high-wear-resistance graphene lubricating oil comprises the following steps:
step one, preparing a mixture A: adding the nano graphene, the polyaniline grafted graphene and the nano zinc oxide into high-shear mixing equipment according to the weight parts, and uniformly stirring and mixing to obtain a mixture A;
step two, preparing a mixture B: adding sodium citrate, sodium alkyl benzene sulfonate, aluminum nitride and sorbitan fatty acid ester into high-speed stirring and mixing equipment according to the parts by weight, and uniformly stirring and mixing to obtain a mixture B;
step three, preparing a mixed solution C: stirring and mixing the dimethyl silicone oil and the polyisobutylene succinimide in the weight part ratio to obtain a mixed solution C;
step four, preparing the graphene lubricating oil: adding the mixed solution C into base oil, stirring for 15min at the temperature of 25 ℃, sequentially adding the mixed solution A and the mixed solution B into the mixed system, and shearing and mixing at 2000r/min for 60min to obtain the high-wear-resistance graphene lubricating oil.
Further, the average particle size of the nano graphene is 30nm, and the average particle size of the nano zinc oxide is 80 nm.
Comparative example 2, a highly wear-resistant graphene lubricating oil and a production process thereof, the highly wear-resistant graphene lubricating oil is prepared from the following components in parts by weight: 95 parts of base oil, 2 parts of nano zinc oxide, 3.5 parts of aluminum nitride, 0.55 part of dimethyl silicone oil, 0.55 part of sorbitan fatty acid ester, 0.55 part of sodium citrate, 0.35 part of sodium alkyl benzene sulfonate and 0.35 part of polyisobutylene succinimide; the production process of the high-wear-resistance graphene lubricating oil comprises the following steps:
step one, preparing a mixture A: adding the nano graphene, the polyaniline grafted graphene and the nano zinc oxide into high-shear mixing equipment according to the weight parts, and uniformly stirring and mixing to obtain a mixture A;
step two, preparing a mixture B: adding sodium citrate, sodium alkyl benzene sulfonate, aluminum nitride and sorbitan fatty acid ester into high-speed stirring and mixing equipment according to the parts by weight, and uniformly stirring and mixing to obtain a mixture B;
step three, preparing a mixed solution C: stirring and mixing the dimethyl silicone oil and the polyisobutylene succinimide in the weight part ratio to obtain a mixed solution C;
step four, preparing the graphene lubricating oil: adding the mixed solution C into base oil, stirring for 12min at the temperature of 30 ℃, sequentially adding the mixed solution A and the mixed solution B into the mixed system, and shearing and mixing at 2500r/min for 50min to obtain the high-wear-resistance graphene lubricating oil.
Further, the average particle size of the nano graphene is 65nm, and the average particle size of the nano zinc oxide is 140 nm.
The above embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and the scope of the present invention is defined by the claims. Various modifications and equivalents may be made by those skilled in the art within the spirit and scope of the present invention, and such modifications and equivalents should also be considered as falling within the scope of the present invention.
Claims (3)
1. The high-wear-resistance graphene lubricating oil is characterized by being prepared from the following components in parts by weight:
the production process of the high-wear-resistance graphene lubricating oil comprises the following steps:
step one, preparing a mixture A: adding the nano graphene, the polyaniline grafted graphene and the nano zinc oxide into high-shear mixing equipment according to the weight parts, and uniformly stirring and mixing to obtain a mixture A;
step two, preparing a mixture B: adding sodium citrate, sodium alkyl benzene sulfonate, aluminum nitride and sorbitan fatty acid ester into high-speed stirring and mixing equipment according to the parts by weight, and uniformly stirring and mixing to obtain a mixture B;
step three, preparing a mixed solution C: stirring and mixing the dimethyl silicone oil and the polyisobutylene succinimide in the weight part ratio to obtain a mixed solution C;
step four, preparing the graphene lubricating oil: adding the mixed solution C into base oil, stirring for 10-15 min at the temperature of 25-35 ℃, sequentially adding the mixed solution A and the mixed solution B into the mixed system, and shearing and mixing at 2000-3000 r/min for 40-60 min to obtain the high-wear-resistance graphene lubricating oil.
2. The graphene lubricating oil with high wear resistance and the production process thereof according to claim 1, wherein the average particle size of the nano graphene is 30-100 nm.
3. The graphene lubricating oil with high wear resistance and the production process thereof according to claim 1, wherein the average particle size of the nano zinc oxide is 80-200 nm.
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| US20160194575A1 (en) * | 2013-09-04 | 2016-07-07 | Instituto Tecnologico Y De Estudios Superiores De Monterrey | Lubricating oil for automotive and industrial applications, containing decorated graphene |
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2020
- 2020-02-27 CN CN202010123617.8A patent/CN111286392A/en active Pending
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| US20160194575A1 (en) * | 2013-09-04 | 2016-07-07 | Instituto Tecnologico Y De Estudios Superiores De Monterrey | Lubricating oil for automotive and industrial applications, containing decorated graphene |
| CN107011568A (en) * | 2017-04-19 | 2017-08-04 | 上海电气集团股份有限公司 | Composite graphite alkene/carbon black is the semi-conducting polymer and preparation method of conducting medium |
| CN107312600A (en) * | 2017-07-06 | 2017-11-03 | 广西柳工机械股份有限公司 | Graphene composite lube additive and preparation method thereof |
| CN109504496A (en) * | 2018-10-23 | 2019-03-22 | 周鹏阳 | Graphene lubricating oil for engine |
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