CN110041991B - Vegetable oil-based high-temperature-resistant lubricating oil and preparation method thereof - Google Patents

Vegetable oil-based high-temperature-resistant lubricating oil and preparation method thereof Download PDF

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CN110041991B
CN110041991B CN201910421016.2A CN201910421016A CN110041991B CN 110041991 B CN110041991 B CN 110041991B CN 201910421016 A CN201910421016 A CN 201910421016A CN 110041991 B CN110041991 B CN 110041991B
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temperature
graphite powder
oil
sol
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CN110041991A (en
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杨新革
高振强
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Linyi University
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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
    • C10M169/048—Mixtures of base-materials and additives the additives being a mixture of compounds of unknown or incompletely defined constitution, non-macromolecular and macromolecular compounds
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    • 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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    • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
    • C10M2201/04—Elements
    • C10M2201/041—Carbon; Graphite; Carbon black
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    • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
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    • C10M2201/105—Silica
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    • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
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    • 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
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    • C10M2207/10—Carboxylix acids; Neutral salts thereof
    • C10M2207/14—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to carbon atoms of six-membered aromatic rings
    • C10M2207/141—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to carbon atoms of six-membered aromatic rings monocarboxylic
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    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/40—Fatty vegetable or animal oils
    • C10M2207/401—Fatty vegetable or animal oils used as base material
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    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/40—Fatty vegetable or animal oils
    • C10M2207/402—Castor oils
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    • 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
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    • 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
    • C10M2209/108—Polyethers, i.e. containing di- or higher polyoxyalkylene groups etherified
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    • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/02—Amines, e.g. polyalkylene polyamines; Quaternary amines
    • C10M2215/04—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to acyclic or cycloaliphatic carbon atoms
    • C10M2215/042—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to acyclic or cycloaliphatic carbon atoms containing hydroxy groups; Alkoxylated derivatives thereof
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    • C10M2227/00—Organic non-macromolecular compounds containing atoms of elements not provided for in groups C10M2203/00, C10M2207/00, C10M2211/00, C10M2215/00, C10M2219/00 or C10M2223/00 as ingredients in lubricant compositions
    • C10M2227/04—Organic non-macromolecular compounds containing atoms of elements not provided for in groups C10M2203/00, C10M2207/00, C10M2211/00, C10M2215/00, C10M2219/00 or C10M2223/00 as ingredients in lubricant compositions having a silicon-to-carbon bond, e.g. organo-silanes
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    • C10M2227/08—Organic non-macromolecular compounds containing atoms of elements not provided for in groups C10M2203/00, C10M2207/00, C10M2211/00, C10M2215/00, C10M2219/00 or C10M2223/00 as ingredients in lubricant compositions having metal-to-carbon bonds
    • C10M2227/081—Organic non-macromolecular compounds containing atoms of elements not provided for in groups C10M2203/00, C10M2207/00, C10M2211/00, C10M2215/00, C10M2219/00 or C10M2223/00 as ingredients in lubricant compositions having metal-to-carbon bonds with a metal carbon bond belonging to a ring, e.g. ferocene
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    • 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
    • C10M2229/042—Siloxanes with specific structure containing aromatic substituents
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    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/02—Pour-point; Viscosity index
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    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/06—Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
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    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
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Abstract

The invention discloses vegetable oil-based high-temperature-resistant lubricating oil and a preparation method thereof, and belongs to the technical field of lubricating oil. The lubricating oil is prepared from corn oil, castor oil, hydroxyl-terminated dimethyl diphenyl polysiloxane, polyvinyl alcohol, ethanolamine, polyethylene glycol monomethyl ether, ferrocene, a preservative, composite graphite powder and modified nano silicon dioxide serving as raw materials. The paraffin-modified graphite powder is added, so that the heat conduction effect of graphite is promoted, the temperature of a friction surface is effectively reduced, and the service life of lubricating oil is prolonged. Meanwhile, the modified nano-silica sol is subjected to oleophylic modification, so that the agglomeration of particles is reduced, and the modified graphite powder is matched to play a role in repairing damage, resisting wear and reducing wear in the friction process. The two components are mutually promoted, the technical effects of high temperature resistance, high-efficiency wear reduction and wear resistance of the lubricating oil are jointly realized, the preparation process is simple, the cost is low, and the lubricating oil has wide application potential.

Description

Vegetable oil-based high-temperature-resistant lubricating oil and preparation method thereof
Technical Field
The invention relates to the technical field of lubricating oil, in particular to vegetable oil-based high-temperature-resistant lubricating oil and a preparation method thereof.
Background
Currently, lubricating oil is widely used in the industries of chemical industry, textile industry, machinery industry and the like. With the further popularization of the economic globalization, especially the rapid development of the automobile industry and the enhancement of the requirements of environmental protection and energy conservation, the demand of high-grade lubricating oil is increasingly vigorous although the total supply of the lubricating oil is not greatly increased. The lubricating oil mainly comprises two parts, namely base oil and an additive, wherein the base oil is the main component of the lubricating oil and accounts for more than 85 percent.
The lubricating oil base oil is divided into vegetable oil, mineral oil and synthetic oil, wherein the vegetable oil has the characteristics of biodegradation and low environmental pollution, and is mineral oil and most of the synthetic oil have no advantages. The modern society has higher requirements on environmental protection, and the characteristics of the vegetable oil just meet the requirements on environmental protection. Although the production cost of the vegetable oil is higher, the vegetable oil has the advantage of low pollution, and the investment of the vegetable oil in environmental pollution treatment is greatly reduced, so the vegetable oil has wide market prospect.
However, the existing vegetable oil-based lubricating oil has poor high-temperature resistance, uneven dispersion of additives, easy oxidation and deterioration in the mechanical friction process and high production cost, so that the application range of the vegetable oil-based lubricating oil is limited and the vegetable oil-based lubricating oil cannot be applied on a large scale.
Disclosure of Invention
In order to solve the problems of the conventional vegetable oil-based lubricating oil, the invention provides the vegetable oil-based lubricating oil which is low in cost, safe and environment-friendly, has high-temperature resistance and self-repairing functions, has obvious friction-reducing and wear-resisting effects and is suitable for being applied to various fields.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a vegetable oil-based high-temperature-resistant lubricating oil is prepared from the following raw materials in parts by weight: 20-40 parts of corn oil, 12-18 parts of castor oil, 10-15 parts of hydroxyl-terminated dimethyl diphenyl polysiloxane, 3-5 parts of polyvinyl alcohol, 3-7 parts of ethanolamine, 4-8 parts of polyethylene glycol monomethyl ether, 1-3 parts of ferrocene, 1-3 parts of preservative, 3-5 parts of composite graphite powder and 2-5 parts of modified nano silicon dioxide.
Preferably, the vegetable oil-based high-temperature-resistant lubricating oil is prepared from the following raw materials in parts by weight: 40 parts of corn oil, 18 parts of castor oil, 15 parts of hydroxyl-terminated dimethyl diphenyl polysiloxane, 5 parts of polyvinyl alcohol, 7 parts of ethanolamine, 8 parts of polyethylene glycol monomethyl ether, 3 parts of ferrocene, 3 parts of preservative, 5 parts of composite graphite powder and 5 parts of modified nano silicon dioxide.
The composite graphite powder is prepared by the following method: slicing paraffin, placing in an electric heating drying box, raising the temperature to fully melt the paraffin, preserving the temperature, adding equal-mass graphite powder, uniformly stirring the graphite powder, standing at room temperature, cooling, crushing, and sieving with a 200-mesh sieve to obtain the paraffin-modified composite graphite powder.
The modified nano silicon dioxide is prepared by the following method:
(1) 165g of tetraethoxysilane, 1300g of absolute ethyl alcohol and 40g of deionized waterAnd 9g NH3·H2Adding O into a beaker, magnetically stirring for 2 hours at the temperature of 30 ℃, aging the sol for 7 days at the temperature of 30 ℃, and refluxing to remove ammonia in the sol to obtain SiO2 sol;
(2) taking 100g of SiO obtained in the step (1)2Adding the sol into a glass bottle, heating to 35 ℃, adding hexamethyldisilazane into the glass reagent bottle, fully stirring for 2h at 35 ℃, then aging for 5d, and controlling the dosage of the hexamethyldisilazane as SiO2SiO in sol22 times of the mass of the nano-silica, and obtaining the modified nano-silica after the aging is finished.
The preservative is prepared from potassium sorbate and sodium benzoate according to the mass ratio of 1: 1.
A preparation method of vegetable oil-based high-temperature-resistant lubricating oil comprises the following steps:
(1) preparing composite graphite powder: slicing paraffin, placing the sliced paraffin in an electric heating drying box, raising the temperature to fully melt the paraffin, preserving the temperature, adding equal-mass graphite powder, uniformly stirring the graphite powder, standing and cooling at room temperature, and crushing the graphite powder and sieving the crushed graphite powder with a 200-mesh sieve to obtain paraffin-modified composite graphite powder;
(2) preparing modified nano-wood silicon dioxide: 165g of ethyl orthosilicate, 1300g of absolute ethyl alcohol, 40g of deionized water and 9g of NH3·H2Adding O into a beaker, magnetically stirring for 2h at the temperature of 30 ℃, aging the sol for 7d at the temperature of 30 ℃, refluxing to remove ammonia in the sol to obtain SiO2Sol; taking 100g of the obtained SiO2Adding the sol into a glass bottle, heating to 35 ℃, adding hexamethyldisilazane into the glass reagent bottle, fully stirring for 2h at 35 ℃, then aging for 5d, and controlling the dosage of the hexamethyldisilazane as SiO2SiO in sol22 times of the mass of the nano-silica, and obtaining the modified nano-silica after the aging is finished;
(3) adding corn oil and castor oil into a reaction kettle according to parts by weight, heating to 80-90 ℃ under a stirring state, sequentially adding hydroxyl-terminated dimethyl diphenyl polysiloxane, polyvinyl alcohol, ethanolamine, polyethylene glycol monomethyl ether, ferrocene and a preservative according to parts by weight under a constant temperature state, and stirring and dissolving for 1-3 hours under a heat preservation magnetic force to obtain a primary mixed solution;
(4) and (3) cooling the primary mixed liquid obtained in the step (3) to 50-60 ℃, adding the composite graphite powder under magnetic stirring, stirring for 12h at the constant temperature of 65 ℃, then adding the modified nano-silica, stirring for 24h at the temperature of 55 ℃, and cooling to room temperature to obtain the final product.
The heating temperature in the step (1) is more than 70 ℃ to ensure that the paraffin is fully melted.
The paraffin wax used by the invention is obtained by market, is the phase-change paraffin wax produced by Shanghai Confucian entropy new energy science and technology company, has the phase-change temperature range of 20-28 ℃, the phase-change latent heat of about 230J/g and the heat conductivity of about 0.15W/(m.K) and is obtained by market through using other raw materials.
Has the advantages that: according to the invention, vegetable oil such as corn oil and castor oil is used as basic crude oil, and the paraffin modified graphite powder is added, so that the mechanical damage of a friction contact surface can be effectively and rapidly filled in the mechanical friction process, and simultaneously, paraffin is melted in the friction heating process, especially in a high-temperature friction environment, the heat conduction effect of graphite is promoted, the friction surface temperature is reduced, and the service life of lubricating oil is prolonged to a certain extent. Meanwhile, the modified nano-silica sol is added, and is subjected to oleophylic modification by hexamethyldisilazane, so that the dispersion of the sol in base oil is promoted, the agglomeration of particles is reduced, and the modified graphite powder is matched to repair damage in the friction process and fully exert the effects of resisting wear and reducing wear. The two components are mutually promoted, the technical effects of high temperature resistance, high-efficiency wear reduction and wear resistance of the lubricating oil are jointly realized, the preparation process is simple, the cost is low, and the lubricating oil has wide application potential.
Detailed Description
The technical solution of the present invention is further described below with reference to specific embodiments, but is not limited thereto.
Example 1
A vegetable oil-based high-temperature-resistant lubricating oil is prepared from the following raw materials in parts by weight: 20 parts of corn oil, 12 parts of castor oil, 10 parts of hydroxyl-terminated dimethyl diphenyl polysiloxane, 3 parts of polyvinyl alcohol, 3 parts of ethanolamine, 4 parts of polyethylene glycol monomethyl ether, 1 part of ferrocene, 1 part of preservative, 3 parts of composite graphite powder and 2 parts of modified nano silicon dioxide.
The composite graphite powder is prepared by the following method: slicing paraffin, placing in an electric heating drying box, raising the temperature to fully melt the paraffin, preserving the temperature, adding equal-mass graphite powder, uniformly stirring the graphite powder, standing at room temperature, cooling, crushing, and sieving with a 200-mesh sieve to obtain the paraffin-modified composite graphite powder.
The modified nano silicon dioxide is prepared by the following method:
(1) 165g of ethyl orthosilicate, 1300g of absolute ethyl alcohol, 40g of deionized water and 9g of NH3·H2Adding O into a beaker, magnetically stirring for 2h at the temperature of 30 ℃, aging the sol for 7d at the temperature of 30 ℃, refluxing to remove ammonia in the sol to obtain SiO2Sol;
(2) taking 100g of SiO obtained in the step (1)2Adding the sol into a glass bottle, heating to 35 ℃, adding hexamethyldisilazane into the glass reagent bottle, fully stirring for 2h at 35 ℃, then aging for 5d, and controlling the dosage of the hexamethyldisilazane as SiO2SiO in sol22 times of the mass of the nano-silica, and obtaining the modified nano-silica after the aging is finished.
The preservative is prepared from potassium sorbate and sodium benzoate according to the mass ratio of 1: 1.
A preparation method of vegetable oil-based high-temperature-resistant lubricating oil comprises the following steps:
(1) preparing composite graphite powder: slicing paraffin, placing the sliced paraffin in an electric heating drying box, raising the temperature to fully melt the paraffin, preserving the temperature, adding equal-mass graphite powder, uniformly stirring the graphite powder, standing and cooling at room temperature, and crushing the graphite powder and sieving the crushed graphite powder with a 200-mesh sieve to obtain paraffin-modified composite graphite powder;
(2) preparing modified nano-wood silicon dioxide: 165g of ethyl orthosilicate, 1300g of absolute ethyl alcohol, 40g of deionized water and 9g of NH3·H2Adding O into a beaker, magnetically stirring for 2h at the temperature of 30 ℃, aging the sol for 7d at the temperature of 30 ℃, refluxing to remove ammonia in the sol to obtain SiO2Sol; taking 100g of the obtained SiO2Sol-added glassHeating to 35 deg.C, adding hexamethyldisilazane into the glass reagent bottle, stirring at 35 deg.C for 2 hr, aging for 5d, and controlling the amount of hexamethyldisilazane to be SiO2SiO in sol22 times of the mass of the nano-silica, and obtaining the modified nano-silica after the aging is finished;
(3) adding corn oil and castor oil into a reaction kettle according to parts by weight, heating to 80-90 ℃ under a stirring state, sequentially adding hydroxyl-terminated dimethyl diphenyl polysiloxane, polyvinyl alcohol, ethanolamine, polyethylene glycol monomethyl ether, ferrocene and a preservative according to parts by weight under a constant temperature state, and stirring and dissolving for 1-3 hours under a heat preservation magnetic force to obtain a primary mixed solution;
(4) and (3) cooling the primary mixed liquid obtained in the step (3) to 50-60 ℃, adding the composite graphite powder under magnetic stirring, stirring for 12h at the constant temperature of 65 ℃, then adding the modified nano-silica, stirring for 24h at the temperature of 55 ℃, and cooling to room temperature to obtain the final product.
The heating temperature in the step (1) is more than 70 ℃ to ensure that the paraffin is fully melted.
Example 2
A vegetable oil-based high-temperature-resistant lubricating oil is prepared from the following raw materials in parts by weight: 30 parts of corn oil, 15 parts of castor oil, 13 parts of hydroxyl-terminated dimethyl diphenyl polysiloxane, 4 parts of polyvinyl alcohol, 5 parts of ethanolamine, 6 parts of polyethylene glycol monomethyl ether, 2 parts of ferrocene, 2 parts of preservative, 4 parts of composite graphite powder and 3 parts of modified nano silicon dioxide.
The preparation method of the vegetable-oil-based high-temperature-resistant lubricating oil is the same as that of example 1 except that the formula dosage is different from that of example 1, and the preparation method of the vegetable-oil-based high-temperature-resistant lubricating oil is also the same as that of example 1.
Example 3
A vegetable oil-based high-temperature-resistant lubricating oil is prepared from the following raw materials in parts by weight: 40 parts of corn oil, 18 parts of castor oil, 15 parts of hydroxyl-terminated dimethyl diphenyl polysiloxane, 5 parts of polyvinyl alcohol, 7 parts of ethanolamine, 8 parts of polyethylene glycol monomethyl ether, 3 parts of ferrocene, 3 parts of preservative, 5 parts of composite graphite powder and 5 parts of modified nano silicon dioxide.
The preparation method of the vegetable-oil-based high-temperature-resistant lubricating oil is the same as that of example 1 except that the formula dosage is different from that of example 1, and the preparation method of the vegetable-oil-based high-temperature-resistant lubricating oil is also the same as that of example 1.
Comparative example 1
A vegetable oil-based high-temperature-resistant lubricating oil is prepared from the following raw materials in parts by weight: 20 parts of corn oil, 12 parts of castor oil, 10 parts of hydroxyl-terminated dimethyl diphenyl polysiloxane, 3 parts of polyvinyl alcohol, 3 parts of ethanolamine, 4 parts of polyethylene glycol monomethyl ether, 1 part of ferrocene, 1 part of preservative, 3 parts of graphite powder and 2 parts of modified nano silicon dioxide.
The modified nano silicon dioxide is prepared by the following method:
(1) 165g of ethyl orthosilicate, 1300g of absolute ethyl alcohol, 40g of deionized water and 9g of NH3·H2Adding O into a beaker, magnetically stirring for 2h at the temperature of 30 ℃, aging the sol for 7d at the temperature of 30 ℃, refluxing to remove ammonia in the sol to obtain SiO2Sol;
(2) taking 100g of SiO obtained in the step (1)2Adding the sol into a glass bottle, heating to 35 ℃, adding hexamethyldisilazane into the glass reagent bottle, fully stirring for 2h at 35 ℃, then aging for 5d, and controlling the dosage of the hexamethyldisilazane as SiO2SiO in sol22 times of the mass of the nano-silica, and obtaining the modified nano-silica after the aging is finished.
The preservative is prepared from potassium sorbate and sodium benzoate according to the mass ratio of 1: 1.
A preparation method of vegetable oil-based high-temperature-resistant lubricating oil comprises the following steps:
(1) preparing modified nano-wood silicon dioxide: 165g of ethyl orthosilicate, 1300g of absolute ethyl alcohol, 40g of deionized water and 9g of NH3·H2Adding O into a beaker, magnetically stirring for 2h at the temperature of 30 ℃, aging the sol for 7d at the temperature of 30 ℃, refluxing to remove ammonia in the sol to obtain SiO2Sol; taking 100g of the obtained SiO2Adding the sol into a glass bottle, heating to 35 ℃, adding hexamethyldisilazane into the glass reagent bottle, fully stirring for 2h at 35 ℃, then aging for 5d, and controlling the dosage of the hexamethyldisilazane as SiO2Si in solO22 times of the mass of the nano-silica, and obtaining the modified nano-silica after the aging is finished;
(2) adding corn oil and castor oil into a reaction kettle according to parts by weight, heating to 80-90 ℃ under a stirring state, sequentially adding hydroxyl-terminated dimethyl diphenyl polysiloxane, polyvinyl alcohol, ethanolamine, polyethylene glycol monomethyl ether, ferrocene and a preservative according to parts by weight under a constant temperature state, and stirring and dissolving for 1-3 hours under a heat preservation magnetic force to obtain a primary mixed solution;
(3) and (3) cooling the primary mixed liquid obtained in the step (2) to 50-60 ℃, adding graphite powder under magnetic stirring, stirring for 12h at the constant temperature of 65 ℃, then adding the modified nano-silica, stirring for 24h at the temperature of 55 ℃, and cooling to room temperature to obtain the final product.
The comparative example is the same as example 1 except that the graphite powder is added, i.e., no paraffin modification is performed.
Comparative example 2
A vegetable oil-based high-temperature-resistant lubricating oil is prepared from the following raw materials in parts by weight: 20 parts of corn oil, 12 parts of castor oil, 10 parts of hydroxyl-terminated dimethyl diphenyl polysiloxane, 3 parts of polyvinyl alcohol, 3 parts of ethanolamine, 4 parts of polyethylene glycol monomethyl ether, 1 part of ferrocene, 1 part of preservative, 3 parts of composite graphite powder and 2 parts of nano silicon dioxide powder.
The composite graphite powder is prepared by the following method: slicing paraffin, placing in an electric heating drying box, raising the temperature to fully melt the paraffin, preserving the temperature, adding equal-mass graphite powder, uniformly stirring the graphite powder, standing at room temperature, cooling, crushing, and sieving with a 200-mesh sieve to obtain the paraffin-modified composite graphite powder.
The preservative is prepared from potassium sorbate and sodium benzoate according to the mass ratio of 1: 1.
A preparation method of vegetable oil-based high-temperature-resistant lubricating oil comprises the following steps:
(1) preparing composite graphite powder: slicing paraffin, placing the sliced paraffin in an electric heating drying box, raising the temperature to fully melt the paraffin, preserving the temperature, adding equal-mass graphite powder, uniformly stirring the graphite powder, standing and cooling at room temperature, and crushing the graphite powder and sieving the crushed graphite powder with a 200-mesh sieve to obtain paraffin-modified composite graphite powder;
(2) adding corn oil and castor oil into a reaction kettle according to parts by weight, heating to 80-90 ℃ under a stirring state, sequentially adding hydroxyl-terminated dimethyl diphenyl polysiloxane, polyvinyl alcohol, ethanolamine, polyethylene glycol monomethyl ether, ferrocene and a preservative according to parts by weight under a constant temperature state, and stirring and dissolving for 1-3 hours under a heat preservation magnetic force to obtain a primary mixed solution;
(3) and (3) cooling the primary mixed liquid obtained in the step (2) to 50-60 ℃, adding the composite graphite powder under magnetic stirring, stirring for 12h at the constant temperature of 65 ℃, then adding the nano silicon dioxide powder, stirring for 24h at the temperature of 55 ℃, and cooling to room temperature to obtain the final product.
The heating temperature in the step (1) is more than 70 ℃ to ensure that the paraffin is fully melted.
The comparative example is the same as example 1 except that the common commercially available nano silica powder is added, i.e. the oleophilic modification is not carried out.
The lubricating oils obtained in examples 1 to 3 and comparative examples 1 to 2 were subjected to performance tests, and the data were determined according to the following methods: the flash point is tested according to GB/T267-88, the thermal stability is tested according to SH/T0680-1999, the oxidation stability is tested according to SH/T0193-2008, the kinematic viscosity is tested according to GB/T11137-1989, the viscosity index is tested according to NFT 60-136-:
table 1 results of performance testing
Figure BDA0002066015370000061
As can be seen from the data in the table, the lubricating oil obtained in the embodiment of the invention has the advantages of good thermal stability, stable use at 300 ℃, good oxidation stability, extremely strong oxidation resistance and good viscosity-temperature property. In the comparative examples 1-2, the abrasion resistance and the thermal stability are remarkably reduced, so that the modification means of the graphite and the silicon dioxide is important for realizing the technical effect of the invention, but the effect is weak, and the two are matched with each other and cannot be realized.
It should be noted that the above-mentioned embodiments are only some of the preferred modes for implementing the invention, and not all of them. Obviously, all other embodiments obtained by persons of ordinary skill in the art based on the above-mentioned embodiments of the present invention without any creative effort shall fall within the protection scope of the present invention.

Claims (4)

1. The vegetable oil-based high-temperature-resistant lubricating oil is characterized by being prepared from the following raw materials in parts by weight: 20-40 parts of corn oil, 12-18 parts of castor oil, 10-15 parts of hydroxyl-terminated dimethyl diphenyl polysiloxane, 3-5 parts of polyvinyl alcohol, 3-7 parts of ethanolamine, 4-8 parts of polyethylene glycol monomethyl ether, 1-3 parts of ferrocene, 1-3 parts of preservative, 3-5 parts of composite graphite powder and 2-5 parts of modified nano silicon dioxide;
the composite graphite powder is prepared by the following method: slicing paraffin, placing the sliced paraffin in an electric heating drying box, raising the temperature to fully melt the paraffin, preserving the temperature, adding equal-mass graphite powder, uniformly stirring the graphite powder, standing and cooling at room temperature, and crushing the graphite powder and sieving the crushed graphite powder with a 200-mesh sieve to obtain paraffin-modified composite graphite powder;
the modified nano silicon dioxide is prepared by the following method:
(1) 165g of ethyl orthosilicate, 1300g of absolute ethyl alcohol, 40g of deionized water and 9g of NH3·H2Adding O into a beaker, magnetically stirring for 2h at the temperature of 30 ℃, aging the sol for 7d at the temperature of 30 ℃, refluxing to remove ammonia in the sol to obtain SiO2Sol;
(2) taking 100g of SiO obtained in the step (1)2Adding the sol into a glass bottle, heating to 35 ℃, adding hexamethyldisilazane into the glass reagent bottle, fully stirring for 2h at 35 ℃, then aging for 5d, and controlling the dosage of the hexamethyldisilazane as SiO2SiO in sol22 times of the mass of the nano-silica, and obtaining the modified nano-silica after the aging is finished.
2. The vegetable oil-based high-temperature-resistant lubricating oil as claimed in claim 1, which is prepared from the following raw materials in parts by weight: 40 parts of corn oil, 18 parts of castor oil, 15 parts of hydroxyl-terminated dimethyl diphenyl polysiloxane, 5 parts of polyvinyl alcohol, 7 parts of ethanolamine, 8 parts of polyethylene glycol monomethyl ether, 3 parts of ferrocene, 3 parts of preservative, 5 parts of composite graphite powder and 5 parts of modified nano silicon dioxide.
3. The vegetable oil-based high-temperature-resistant lubricating oil as claimed in claim 1 or 2, wherein the preservative is obtained by mixing potassium sorbate and sodium benzoate in a mass ratio of 1: 1.
4. A method for preparing the vegetable oil-based high temperature resistant lubricating oil according to claim 1 or 2, which is characterized by comprising the following steps:
(1) preparing composite graphite powder: slicing paraffin, placing the sliced paraffin in an electric heating drying box, raising the temperature to fully melt the paraffin, preserving the temperature, adding equal-mass graphite powder, uniformly stirring the graphite powder, standing and cooling at room temperature, and crushing the graphite powder and sieving the crushed graphite powder with a 200-mesh sieve to obtain paraffin-modified composite graphite powder;
(2) preparing modified nano-wood silicon dioxide: 165g of ethyl orthosilicate, 1300g of absolute ethyl alcohol, 40g of deionized water and 9g of NH3·H2Adding O into a beaker, magnetically stirring for 2h at the temperature of 30 ℃, aging the sol for 7d at the temperature of 30 ℃, refluxing to remove ammonia in the sol to obtain SiO2Sol; taking 100g of the obtained SiO2Adding the sol into a glass bottle, heating to 35 ℃, adding hexamethyldisilazane into the glass reagent bottle, fully stirring for 2h at 35 ℃, then aging for 5d, and controlling the dosage of the hexamethyldisilazane as SiO2SiO in sol22 times of the mass of the nano-silica, and obtaining the modified nano-silica after the aging is finished;
(3) adding corn oil and castor oil into a reaction kettle according to parts by weight, heating to 80-90 ℃ under a stirring state, sequentially adding hydroxyl-terminated dimethyl diphenyl polysiloxane, polyvinyl alcohol, ethanolamine, polyethylene glycol monomethyl ether, ferrocene and a preservative according to parts by weight under a constant temperature state, and stirring and dissolving for 1-3 hours under a heat preservation magnetic force to obtain a primary mixed solution;
(4) and (3) cooling the primary mixed liquid obtained in the step (3) to 50-60 ℃, adding the composite graphite powder under magnetic stirring, stirring for 12h at the constant temperature of 65 ℃, then adding the modified nano-silica, stirring for 24h at the temperature of 55 ℃, and cooling to room temperature to obtain the final product.
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