CN110591791A - Graphene lubricating oil additive and preparation method thereof - Google Patents
Graphene lubricating oil additive 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
- C10M125/00—Lubricating compositions characterised by the additive being an inorganic material
- C10M125/02—Carbon; Graphite
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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
- C10M161/00—Lubricating compositions characterised by the additive being a mixture of a macromolecular compound and a non-macromolecular compound, each of these compounds being essential
-
- 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
-
- 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
-
- 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
- C10M2201/087—Boron oxides, acids or salts
-
- 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
-
- 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
- C10M2207/02—Hydroxy compounds
- C10M2207/021—Hydroxy compounds having hydroxy groups bound to acyclic or cycloaliphatic carbon atoms
- C10M2207/022—Hydroxy compounds having hydroxy groups bound to acyclic or cycloaliphatic carbon atoms containing at least two hydroxy groups
-
- 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
- C10M2207/02—Hydroxy compounds
- C10M2207/023—Hydroxy compounds having hydroxy groups bound to carbon atoms of six-membered aromatic rings
- C10M2207/026—Hydroxy compounds having hydroxy groups bound to carbon atoms of six-membered aromatic rings with tertiary alkyl groups
-
- 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
- C10M2207/04—Ethers; Acetals; Ortho-esters; Ortho-carbonates
- C10M2207/042—Epoxides
-
- 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
- C10M2207/125—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
- C10M2207/126—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids monocarboxylic
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/28—Esters
- C10M2207/281—Esters of (cyclo)aliphatic monocarboxylic acids
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
- C10M2209/10—Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C10M2209/103—Polyethers, i.e. containing di- or higher polyoxyalkylene groups
- C10M2209/104—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of alkylene oxides containing two carbon atoms only
-
- 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
-
- 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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- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Lubricants (AREA)
- Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
Abstract
The invention discloses a graphene lubricating oil additive which is prepared from the following raw materials in parts by weight: 10-15 parts of graphene modified film-forming additive, 3-5 parts of calcium linoleate soap, 0.4-1 part of tert-butyl p-diphenol and 2-3 parts of sorbitan monostearate.
Description
Technical Field
The invention belongs to the field of lubricating oil, and particularly relates to a graphene lubricating oil additive and a preparation method thereof.
Background
Lubricating oil additives are compounds added to lubricants to impart new properties to the lubricant or to improve some of the properties already present in the lubricant. The additive mainly comprises antioxidant, antiwear agent, friction modifier (oiliness agent), extreme pressure additive, detergent, dispersant, foam inhibitor, anticorrosion and antirust agent, pour point improver, viscosity index improver and the like according to functions;
at present, the additives sold in the market are generally composite products of the above single additives, the properties of the additives are unstable, the dispersibility of the additives in base oil is poor, and the use effect of lubricating oil is easy to reduce.
Disclosure of Invention
The invention aims to overcome the defects that the additive sold in the existing market is unstable in property and poor in dispersibility in base oil, and provides a graphene lubricating oil additive which is good in dispersibility and has a lubricating effect enhancement, and a preparation method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
a graphene lubricating oil additive is composed of the following raw materials in parts by weight:
10-15 parts of graphene modified film-forming additive, 3-5 parts of calcium linoleate soap, 0.4-1 part of tert-butyl p-diphenol and 2-3 parts of sorbitan monostearate.
The graphene modified film-forming assistant is prepared from the following raw materials in parts by weight:
3-4 parts of graphene, 20-30 parts of methyl cellulose, 7-10 parts of petroleum sodium sulfonate, 4-6 parts of ethylene glycol, 5-7 parts of boric acid, 0.01-0.02 part of p-toluenesulfonic acid, 4-5 parts of epoxy propanol, 1-2 parts of fatty alcohol-polyoxyethylene ether and 0.1-0.2 part of sodium hydroxide.
The degree of substitution of the methylcellulose is from 2.4 to 2.7.
The preparation method of the graphene modified film-forming assistant comprises the following steps:
(1) mixing boric acid and graphene, preheating for 10-20 minutes at the temperature of 100-110 ℃, cooling to normal temperature, adding ethylene glycol and p-toluenesulfonic acid, and stirring for 1-2 hours at the temperature of 90-97 ℃ to obtain pretreated graphene;
(2) adding methyl cellulose into methanol with the weight 8-11 times of that of the methyl cellulose, uniformly stirring, sending into a constant-temperature water bath with the temperature of 55-60 ℃, adding fatty alcohol-polyoxyethylene ether, and stirring for 20-30 minutes under the condition of heat preservation to obtain a fiber dispersion liquid;
(3) mixing the pretreated graphene with epoxy propanol, adding the mixture into the fiber dispersion liquid, uniformly stirring, feeding the mixture into a stainless steel reaction kettle, introducing nitrogen, adjusting the temperature of the reaction kettle to 90-100 ℃, carrying out stirring reaction for 1-2 hours, adding sodium petroleum sulfonate and sodium hydroxide, adjusting the temperature of the reaction kettle to 150-160 ℃, carrying out heat preservation stirring for 2-3 hours, discharging, carrying out rotary evaporation, and removing toluene to obtain the graphene modified film-forming assistant.
A preparation method of a graphene lubricating oil additive comprises the following steps:
adding tert-butyl p-diphenol into absolute ethyl alcohol with the weight 4-7 times of the tert-butyl p-diphenol, uniformly stirring, adding calcium linoleate soap, raising the temperature to 60-70 ℃, keeping the temperature and stirring for 1-2 hours, adding the graphene modified film-forming assistant and sorbitan monostearate, uniformly stirring, and removing the ethyl alcohol by rotary evaporation to obtain the finished product.
The invention has the advantages that:
according to the invention, the graphene is treated by boric acid, blended with ethylene glycol, esterified at high temperature and mixed with epoxypropanol, a methyl cellulose methanol solution is used as a dispersion liquid, and sodium hydroxide is used as a catalyst, so that the dispersion performance of the graphene among methyl cellulose is improved, the mechanical strength of a methyl cellulose film is improved, and the graphene has good lubricating performance, so that the lubricating performance of the traditional oil can be effectively improved by the additive provided by the invention, and the quality of the finished oil is improved.
Detailed Description
Example 1
A graphene lubricating oil additive is composed of the following raw materials in parts by weight:
10 parts of graphene modified film-forming additive, 3 parts of calcium linoleate soap, 0.4 part of tert-butyl p-diphenol and 2 parts of sorbitan monostearate.
The graphene modified film-forming assistant is prepared from the following raw materials in parts by weight:
3 parts of graphene, 20 parts of methyl cellulose, 7 parts of petroleum sodium sulfonate, 4 parts of ethylene glycol, 5 parts of boric acid, 0.01 part of p-methyl benzenesulfonic acid, 4 parts of epoxy propanol, 1 part of fatty alcohol-polyoxyethylene ether and 0.1 part of sodium hydroxide.
The degree of substitution of the methylcellulose is from 2.4 to 2.7.
The preparation method of the graphene modified film-forming assistant comprises the following steps:
(1) mixing boric acid and graphene, preheating for 10 minutes at 100 ℃, cooling to normal temperature, adding ethylene glycol and p-toluenesulfonic acid, and stirring for 1 hour at 90 ℃ to obtain pretreated graphene;
(2) adding methyl cellulose into methanol with the weight 8 times of that of the methyl cellulose, uniformly stirring, sending into a constant-temperature water bath at 55 ℃, adding fatty alcohol-polyoxyethylene ether, and stirring for 20 minutes under heat preservation to obtain a fiber dispersion liquid;
(3) mixing the pretreated graphene with epoxy propanol, adding the mixture into the fiber dispersion liquid, uniformly stirring, feeding the mixture into a stainless steel reaction kettle, introducing nitrogen, adjusting the temperature of the reaction kettle to 90 ℃, stirring for reaction for 1 hour, adding sodium petroleum sulfonate and sodium hydroxide, adjusting the temperature of the reaction kettle to 150 ℃, keeping the temperature and stirring for 2 hours, discharging, carrying out rotary evaporation, and removing toluene to obtain the graphene modified film-forming assistant.
A preparation method of a graphene lubricating oil additive comprises the following steps:
adding tert-butyl p-diphenol into absolute ethyl alcohol with the weight 4 times of the tert-butyl p-diphenol, uniformly stirring, adding calcium linoleate soap, raising the temperature to 60 ℃, keeping the temperature and stirring for 1 hour, adding the graphene modified film-forming aid and sorbitan monostearate, uniformly stirring, and removing the ethyl alcohol by rotary evaporation to obtain the finished product.
Example 2
A graphene lubricating oil additive is composed of the following raw materials in parts by weight:
15 parts of graphene modified film-forming additive, 5 parts of calcium linoleate soap, 1 part of tert-butyl p-diphenol and 3 parts of sorbitan monostearate.
The graphene modified film-forming assistant is prepared from the following raw materials in parts by weight:
4 parts of graphene, 30 parts of methyl cellulose, 10 parts of petroleum sodium sulfonate, 6 parts of ethylene glycol, 7 parts of boric acid, 0.02 part of p-methyl benzenesulfonic acid, 5 parts of epoxy propanol, 2 parts of fatty alcohol-polyoxyethylene ether and 0.2 part of sodium hydroxide.
The degree of substitution of the methylcellulose was 2.7.
The preparation method of the graphene modified film-forming assistant comprises the following steps:
(1) mixing boric acid and graphene, preheating for 20 minutes at 110 ℃, cooling to normal temperature, adding ethylene glycol and p-toluenesulfonic acid, and stirring for 2 hours at 97 ℃ to obtain pretreated graphene;
(2) adding methyl cellulose into methanol with the weight 11 times of that of the methyl cellulose, uniformly stirring, sending into a constant-temperature water bath at 60 ℃, adding fatty alcohol-polyoxyethylene ether, and stirring for 30 minutes under heat preservation to obtain a fiber dispersion liquid;
(3) mixing the pretreated graphene with epoxy propanol, adding the mixture into the fiber dispersion liquid, uniformly stirring, feeding the mixture into a stainless steel reaction kettle, introducing nitrogen, adjusting the temperature of the reaction kettle to be 100 ℃, stirring for reaction for 2 hours, adding sodium petroleum sulfonate and sodium hydroxide, adjusting the temperature of the reaction kettle to be 160 ℃, keeping the temperature and stirring for 3 hours, discharging, carrying out rotary evaporation, and removing toluene to obtain the graphene modified film-forming assistant.
A preparation method of a graphene lubricating oil additive comprises the following steps:
adding tert-butyl p-diphenol into absolute ethyl alcohol with the weight 7 times of the tert-butyl p-diphenol, uniformly stirring, adding calcium linoleate soap, raising the temperature to 70 ℃, keeping the temperature and stirring for 2 hours, adding the graphene modified film-forming aid and sorbitan monostearate, uniformly stirring, and removing the ethyl alcohol by rotary evaporation to obtain the finished product.
The performance of the test piece is tested by the test piece,
the graphene lubricating oil additive disclosed by the embodiment 1 and the embodiment 2 is added into PAO7 base oil with the weight 40 times that of the base oil, the mixture is uniformly stirred, the kinematic viscosity of the base oil is tested according to a GB/T265 petroleum product kinematic viscosity measurement method and a dynamic viscosity calculation method, and the lubricating performance is tested according to an SH/T0189 lubricating oil wear resistance measurement method (a four-ball machine method);
kinematic viscosity 100 deg.C (mm)2/s)：
The PAO7 base oil of example 1 of the invention was added: 59;
the PAO7 base oil of example 1 of the invention was added: 57;
the diameter of the abrasion marks/mm;
the PAO7 base oil of example 1 of the invention was added: 0.31;
the PAO7 base oil of example 1 of the invention was added: 0.35.
Claims (5)
1. the graphene lubricating oil additive is characterized by being prepared from the following raw materials in parts by weight:
10-15 parts of graphene modified film-forming additive, 3-5 parts of calcium linoleate soap, 0.4-1 part of tert-butyl p-diphenol and 2-3 parts of sorbitan monostearate.
2. The graphene lubricating oil additive according to claim 1, wherein the graphene modified film-forming assistant is composed of the following raw materials in parts by weight:
3-4 parts of graphene, 20-30 parts of methyl cellulose, 7-10 parts of petroleum sodium sulfonate, 4-6 parts of ethylene glycol, 5-7 parts of boric acid, 0.01-0.02 part of p-toluenesulfonic acid, 4-5 parts of epoxy propanol, 1-2 parts of fatty alcohol-polyoxyethylene ether and 0.1-0.2 part of sodium hydroxide.
3. The graphene lubricating oil additive according to claim 1, wherein the degree of substitution of the methylcellulose is 2.4-2.7.
4. The graphene lubricating oil additive as claimed in claim 2, wherein the preparation method of the graphene modified film-forming assistant comprises the following steps:
(1) mixing boric acid and graphene, preheating for 10-20 minutes at the temperature of 100-110 ℃, cooling to normal temperature, adding ethylene glycol and p-toluenesulfonic acid, and stirring for 1-2 hours at the temperature of 90-97 ℃ to obtain pretreated graphene;
(2) adding methyl cellulose into methanol with the weight 8-11 times of that of the methyl cellulose, uniformly stirring, sending into a constant-temperature water bath with the temperature of 55-60 ℃, adding fatty alcohol-polyoxyethylene ether, and stirring for 20-30 minutes under the condition of heat preservation to obtain a fiber dispersion liquid;
(3) mixing the pretreated graphene with epoxy propanol, adding the mixture into the fiber dispersion liquid, uniformly stirring, feeding the mixture into a stainless steel reaction kettle, introducing nitrogen, adjusting the temperature of the reaction kettle to 90-100 ℃, carrying out stirring reaction for 1-2 hours, adding sodium petroleum sulfonate and sodium hydroxide, adjusting the temperature of the reaction kettle to 150-160 ℃, carrying out heat preservation stirring for 2-3 hours, discharging, carrying out rotary evaporation, and removing toluene to obtain the graphene modified film-forming assistant.
5. The preparation method of the graphene lubricating oil additive according to claim 1, characterized by comprising the following steps:
adding tert-butyl p-diphenol into absolute ethyl alcohol with the weight 4-7 times of the tert-butyl p-diphenol, uniformly stirring, adding calcium linoleate soap, raising the temperature to 60-70 ℃, keeping the temperature and stirring for 1-2 hours, adding the graphene modified film-forming assistant and sorbitan monostearate, uniformly stirring, and removing the ethyl alcohol by rotary evaporation to obtain the finished product.
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| CN201910883798.1A CN110591791A (en) | 2019-09-19 | 2019-09-19 | Graphene lubricating oil additive and preparation method thereof |
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| CN201910883798.1A CN110591791A (en) | 2019-09-19 | 2019-09-19 | Graphene lubricating oil additive and preparation method thereof |
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| CN107502406A (en) * | 2017-08-31 | 2017-12-22 | 张学瑞 | A kind of nano-graphite lubricant additive and preparation method thereof |
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| CN109609244A (en) * | 2018-07-17 | 2019-04-12 | 深圳市优宝新材料科技有限公司 | The extreme pressure anti-wear additives and preparation method thereof of oil-soluble borate modified graphene oxide |
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2019
- 2019-09-19 CN CN201910883798.1A patent/CN110591791A/en not_active Withdrawn
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140212587A1 (en) * | 2006-01-12 | 2014-07-31 | Nanomech, Inc. | Nano-tribology compositions and related methods including molecular nano-sheets |
| CN105567377A (en) * | 2015-12-28 | 2016-05-11 | 芜湖市创源新材料有限公司 | Excellent-anti-corrosion-performance synthetic hydraulic oil |
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| CN107090001A (en) * | 2017-06-02 | 2017-08-25 | 扬州大学 | A kind of preparation method of modified graphene oxide |
| CN107502406A (en) * | 2017-08-31 | 2017-12-22 | 张学瑞 | A kind of nano-graphite lubricant additive and preparation method thereof |
| CN108192705A (en) * | 2017-12-27 | 2018-06-22 | 张艳雪 | A kind of environment-friendly type mechanical lubrication fluid composition and its preparation process |
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Application publication date: 20191220 |
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| WW01 | Invention patent application withdrawn after publication |