CN112063434A - High-temperature lubricating grease for aviation and production method thereof - Google Patents

High-temperature lubricating grease for aviation and production method thereof Download PDF

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Publication number
CN112063434A
CN112063434A CN202010985623.4A CN202010985623A CN112063434A CN 112063434 A CN112063434 A CN 112063434A CN 202010985623 A CN202010985623 A CN 202010985623A CN 112063434 A CN112063434 A CN 112063434A
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aviation
grease
temperature
antioxidant
oil
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刘佩仓
吕英华
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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
    • 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
    • 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
    • C10M2201/087—Boron oxides, acids or salts
    • C10M2201/0876—Boron oxides, acids or salts used as thickening agent
    • 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
    • C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
    • C10M2203/06—Well-defined aromatic compounds
    • C10M2203/065—Well-defined aromatic compounds used as base material
    • 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
    • C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
    • C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
    • C10M2203/1006—Petroleum or coal fractions, e.g. tars, solvents, bitumen used as base material
    • 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
    • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
    • C10M2205/02—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers
    • C10M2205/0206—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers used as base material
    • 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
    • C10M2207/10—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
    • C10M2207/127—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 polycarboxylic
    • C10M2207/1276—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 polycarboxylic used as thickening agent
    • 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
    • C10M2207/128—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 containing hydroxy groups; Ethers thereof
    • C10M2207/1285—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 containing hydroxy groups; Ethers thereof used as thickening agents
    • 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
    • C10M2207/14—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to carbon atoms of six-membered aromatic rings
    • C10M2207/144—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to carbon atoms of six-membered aromatic rings containing hydroxy groups
    • C10M2207/1446—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to carbon atoms of six-membered aromatic rings containing hydroxy groups used as thickening agent
    • 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
    • C10M2207/2805—Esters used as base material
    • 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
    • C10M2219/046—Overbasedsulfonic acid 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
    • C10M2223/00—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions
    • C10M2223/02—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions having no phosphorus-to-carbon bonds
    • C10M2223/04—Phosphate esters
    • C10M2223/045—Metal containing thio derivatives
    • 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
    • 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
    • C10M2227/09—Complexes with metals

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Lubricants (AREA)

Abstract

The invention discloses high-temperature lubricating grease for aviation, which comprises a composite lithium thickener, synthetic base oil, a friction modifier, an antioxidant, a polar press and an antirust agent, wherein the components in percentage by mass are as follows: synthesizing base oil: 75-92%; composite lithium thickener: 4-25%; friction modifiers: 1.5-5.0%; antioxidant: 1.5-3%; extreme pressure agent: 0.3-3.0%; antirust agent: 0.6 to 2.5 percent. The lubricating grease does not contain polytetrafluoroethylene, and has small abrasion to the surfaces of parts such as engine bearings and the like; the lubricating grease obtained after the components interact with each other has good and stable performance, has good compatibility with aviation lubricating oil, does not cause the aviation lubricating oil to become turbid and foam when in use, and does not block a filter of an aviation lubricating oil circulating system.

Description

High-temperature lubricating grease for aviation and production method thereof
Technical Field
The invention relates to the field of lubricating grease, and particularly relates to high-temperature lubricating grease for aviation and a production method thereof.
Background
Greases are oily lubricants in the semisolid or solid state that are often used to lubricate mechanically exposed friction. Compared with lubricating oil, the lubricating grease has the advantages of high adhesion, wider use temperature range, longer oil change period and the like, and is suitable for lubrication under severe conditions such as high pressure, high temperature and the like.
Aviation grease is mainly used for meeting the aviation requirements, because the high altitude and high pressure are slightly higher than the requirements of general grease. Aviation greases can be classified into aviation mechanical greases, aviation machine parts and instruments greases, aviation protection greases and aviation sealing greases according to the basic functions and the application range of the aviation greases. The aircraft machinery lubricating grease is used for reducing friction and abrasion of aircraft machinery and preventing parts from being scratched and clamped. For example, certain open hinge joints for aircraft fuselages are lubricated using a No. 221 grease; the airplane wheel bearing uses No. 4 high-temperature lubricating grease to reduce friction, and the lubricating grease for aviation machine parts and instruments is used for reducing friction and abrasion of the machine parts and the instruments and ensuring long-term stable operation of the parts. For example, motor bearings of electric machines use special No. 7 precision gauge grease to reduce friction; the transmission mechanism of the aerial camera is lubricated by using No. 3 instrument lubricating grease. Aviation protection lubricating grease is used for protecting the surfaces of parts and preventing corrosion. For example, No. 4 rust preventive grease is used for sealing an aircraft engine to prevent oxidation corrosion during long-term storage. Aviation sealing grease is used for sealing various conduit threaded joints and other connecting parts of fuel systems, hydraulic systems and the like. For example, the gasoline resistant seal grease No. 5 is not compatible with gasoline and kerosene and can coat conduit joints of aircraft fuel systems.
With the advancement of technology and the increase in productivity of mechanical equipment, the demand for high-temperature operating conditions and lubricating compositions (e.g., greases) is increasing, and lubricity is improved.
Currently available high temperature lithium-based greases are composed of solid particles such as Polytetrafluoroethylene (PTFE), which can result in lubricated, worn expensive surfaces (e.g., bearings, gears, slides, etc.) or Polyester (POE) base oils that are limited in certain properties and impractical to produce.
Disclosure of Invention
In view of the above problems, the present invention aims to provide a high temperature grease for aviation which is suitable for high temperature and low temperature environments and has less wear on equipment, and a production method thereof.
In order to realize the technical purpose, the scheme of the invention is as follows: the high-temperature lubricating grease for aviation comprises a composite lithium thickener, synthetic base oil, a friction modifier, an antioxidant, an extreme pressure machine, an antirust agent and the like, and comprises the following components in percentage by mass:
synthesizing base oil: 75-92%; composite lithium thickener: 4-25%; friction modifiers: 1.5-5.0%; antioxidant: 1.5-3%; extreme pressure agent: 0.3-3.0%; antirust agent: 0.6 to 2.5 percent.
Preferably, the synthetic base oil comprises the following components in percentage by mass: 20-29% of alkyl naphthalene, 10-18% of ester oil, 15-28% of mineral oil and 24-50% of poly alpha olefin.
Preferably, the lithium thickener is prepared by reacting dodecahydroxystearic acid, sebacic acid, salicylic acid, boric acid and lithium hydroxide monohydrate.
Preferably, the friction modifier is a 1:9 mixture of molybdenum dialkyldithiocarbamate and zinc dialkyldithiophosphate.
Preferably, the antioxidant is 2,4, 6-tri-tert-butylphenol.
Preferably, the extreme pressure agent is a borate compound.
Preferably, the antirust agent is high-base-number calcium petroleum sulfonate.
The production method comprises the following specific steps of:
firstly, mixing alkyl naphthalene, poly alpha olefin, dodecahydroxy stearic acid, sebacic acid, salicylic acid, boric acid and lithium hydroxide monohydrate in a pressure reaction kettle in proportion;
secondly, adding a proper amount of deionized water into the reaction kettle, and sealing the kettle cover;
thirdly, starting stirring and heating, raising the temperature to 110-135 ℃, and reacting for 30-60 minutes under 0.4 MPa;
and fourthly, after the reaction is finished, slowly opening the pressure release valve until the pressure in the kettle is 0, adding mineral oil, continuously stirring and heating to the temperature of 190 plus materials and 210 ℃, keeping the temperature for 5-15 minutes, stopping heating, and adding ester oil.
Fifthly, cooling the materials in the kettle to below 80 ℃, adding a friction modifier, an antioxidant, an extreme pressure agent and an antirust agent, and grinding the materials into grease by three-roller grinding.
Compared with the prior art, the lubricating grease disclosed by the invention does not contain polytetrafluoroethylene, so that the surface abrasion of parts such as an engine bearing is small; the lubricating grease obtained after the components interact with each other has good and stable performance, has good compatibility with aviation lubricating oil, does not cause the aviation lubricating oil to become turbid and foam when in use, and does not block a filter of an aviation lubricating oil circulating system.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
The specific embodiment of the invention is high-temperature lubricating grease for aviation, which comprises a composite lithium thickening agent, synthetic base oil, a friction modifier, an antioxidant, a polar press and an antirust agent, wherein the components in percentage by mass are as follows:
synthesizing base oil: 75-92%, wherein the synthetic base oil comprises the following components in percentage by mass: 20-29% of alkyl naphthalene, 10-18% of ester oil, 15-28% of mineral oil and 24-50% of poly alpha olefin.
Composite lithium thickener: 4-25%, and the composite lithium thickening agent is prepared by reacting dodecahydroxystearic acid, sebacic acid, salicylic acid, boric acid and lithium hydroxide monohydrate. Friction modifiers: 1.5-5.0%, wherein the friction modifier is a mixture of molybdenum dialkyl dithiocarbamate and zinc dialkyl dithiophosphate according to a ratio of 1: 9.
Antioxidant: 1.5-3%, wherein the antioxidant is 2,4, 6-tri-tert-butylphenol. Extreme pressure agent: 0.3-3.0%, and the extreme pressure agent is a borate compound. Antirust agent: 0.6-2.5%, and the antirust agent is high-base-number calcium petroleum sulfonate.
The synthetic base oil contains 35-50% of poly alpha olefin by mass. Because the aviation environment requires the lubricating grease to be suitable for high temperature and low temperature, the low-temperature fluidity can be improved by controlling the content of the poly-alpha olefin.
The production method comprises the following specific steps of:
firstly, mixing alkyl naphthalene, poly alpha olefin, dodecahydroxy stearic acid, sebacic acid, salicylic acid, boric acid and lithium hydroxide monohydrate in a pressure reaction kettle in proportion;
secondly, adding a proper amount of deionized water into the reaction kettle, and sealing the kettle cover;
thirdly, starting stirring and heating, raising the temperature to 110-135 ℃, and reacting for 30-60 minutes under 0.4 MPa;
and fourthly, after the reaction is finished, slowly opening the pressure release valve until the pressure in the kettle is 0, adding mineral oil, continuously stirring and heating to the temperature of 190 plus materials and 210 ℃, keeping the temperature for 5-15 minutes, stopping heating, and adding ester oil.
Fifthly, cooling the materials in the kettle to below 80 ℃, adding a friction modifier, an antioxidant, an extreme pressure agent and an antirust agent, and grinding the materials into grease by three-roller grinding.
For convenience of explanation of the grease effect of the present application, the grease of the present invention will be described in detail below with reference to specific examples. The selected synthetic base oils in the following examples of the present application are in mass percent: 25% of alkyl naphthalene, 15% of ester oil, 20% of mineral oil and 40% of poly alpha olefin.
Example 1: the lubricating grease comprises the following components in percentage by mass: synthesizing base oil: 84%; composite lithium thickener: 12 percent; friction modifiers: 1.5 percent; antioxidant: 2 percent; extreme pressure agent: 1 percent; antirust agent: 0.5 percent.
The preparation process comprises the following steps: mixing alkyl naphthalene, poly alpha olefin, dodecahydroxy stearic acid, sebacic acid, salicylic acid, boric acid and lithium hydroxide monohydrate in proportion, and adding into a pressure reaction kettle; adding a proper amount of deionized water into the reaction kettle, and sealing the kettle cover; starting stirring and heating, raising the temperature to 130 ℃, and reacting for 40 minutes under 0.4 MPa; after the reaction is finished, slowly opening the pressure release valve until the pressure in the kettle is 0, adding mineral oil, continuously stirring and heating to 200 ℃, keeping the temperature for 5 minutes, stopping heating, and adding ester oil. The materials in the kettle are cooled to below 80 ℃, added with a friction modifier, an antioxidant, an extreme pressure agent and an antirust agent, and ground into grease by three-roller grinding.
The performance characteristics of the grease prepared in example one are as follows:
Figure BDA0002689086430000051
Figure BDA0002689086430000061
example 2: the lubricating grease comprises the following components in percentage by mass: 83.5% of synthetic base oil; composite lithium thickener: 10 percent; friction modifiers: 3 percent; antioxidant: 2 percent; extreme pressure agent: 1 percent; antirust agent: 0.5 percent.
The preparation process comprises the following steps: mixing alkyl naphthalene, poly alpha olefin, dodecahydroxy stearic acid, sebacic acid, salicylic acid, boric acid and lithium hydroxide monohydrate in proportion, and adding into a pressure reaction kettle; adding a proper amount of deionized water into the reaction kettle, and sealing the kettle cover; starting stirring and heating, raising the temperature to 130 ℃, and reacting for 40 minutes under 0.4 MPa; after the reaction is finished, slowly opening the pressure release valve until the pressure in the kettle is 0, adding mineral oil, continuously stirring and heating to 210 ℃, keeping the temperature for 5 minutes, stopping heating, and adding ester oil. The materials in the kettle are cooled to below 80 ℃, added with a friction modifier, an antioxidant, an extreme pressure agent and an antirust agent, and ground into grease by three-roller grinding.
The performance characteristics of the grease prepared in example two were as follows:
Figure BDA0002689086430000062
Figure BDA0002689086430000071
example 3: the lubricating grease comprises the following components in percentage by mass: 86% of synthetic base oil; composite lithium thickener: 8 percent; friction modifiers: 1.5 percent; antioxidant: 2 percent; extreme pressure agent: 2 percent; antirust agent: 0.5 percent.
The preparation process comprises the following steps: mixing alkyl naphthalene, poly alpha olefin, dodecahydroxy stearic acid, sebacic acid, salicylic acid, boric acid and lithium hydroxide monohydrate in proportion, and adding into a pressure reaction kettle; adding a proper amount of deionized water into the reaction kettle, and sealing the kettle cover; starting stirring and heating, raising the temperature to 130 ℃, and reacting for 40 minutes under 0.4 MPa; after the reaction is finished, slowly opening the pressure release valve until the pressure in the kettle is 0, adding mineral oil, continuously stirring and heating to 200 ℃, keeping the temperature for 5 minutes, stopping heating, and adding ester oil. The materials in the kettle are cooled to below 80 ℃, added with a friction modifier, an antioxidant, an extreme pressure agent and an antirust agent, and ground into grease by three-roller grinding.
The performance characteristics of the grease prepared in example three were as follows:
Figure BDA0002689086430000072
compared with the prior art, the lubricating grease does not contain polytetrafluoroethylene, and has small abrasion to the surfaces of parts such as engine bearings and the like; the lubricating grease obtained after the components interact with each other has good and stable performance, has good compatibility with aviation lubricating oil, does not cause the aviation lubricating oil to become turbid and foam when in use, and does not block a filter of an aviation lubricating oil circulating system.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and any minor modifications, equivalent replacements and improvements made to the above embodiment according to the technical spirit of the present invention should be included in the protection scope of the technical solution of the present invention.

Claims (8)

1. The high-temperature lubricating grease for aviation comprises a composite lithium thickener and synthetic base oil, and is characterized in that: the lubricant also comprises a friction modifier, an antioxidant, a polar press, an antirust agent and the like, and the components in percentage by mass are as follows:
synthesizing base oil: 75-92%;
composite lithium thickener: 4-25%;
friction modifiers: 1.5-5.0%;
antioxidant: 1.5-3%;
extreme pressure agent: 0.3-3.0%;
antirust agent: 0.6 to 2.5 percent.
2. The high temperature grease for aviation according to claim 1, wherein: the synthetic base oil comprises the following components in percentage by mass: 20-29% of alkyl naphthalene, 10-18% of ester oil, 15-28% of mineral oil and 24-50% of poly alpha olefin.
3. The high temperature grease for aviation according to claim 1, wherein: the lithium thickener can be prepared by reacting dodecahydroxystearic acid, sebacic acid, salicylic acid, boric acid and lithium hydroxide monohydrate.
4. The high temperature grease for aviation according to claim 1, wherein: the friction modifier is a mixture of molybdenum dialkyl dithiocarbamate and zinc dialkyl dithiophosphate according to the ratio of 1: 9.
5. The high temperature grease for aviation according to claim 1, wherein: the antioxidant is 2,4, 6-tri-tert-butylphenol.
6. The high temperature grease for aviation according to claim 1, wherein: the extreme pressure agent is a borate compound.
7. The high temperature grease for aviation according to claim 1, wherein: the antirust agent is high-base-number calcium petroleum sulfonate.
8. A method of manufacture, characterized by: the high-temperature aeronautical grease according to any one of claims 1 to 7, comprising the following specific steps:
firstly, mixing alkyl naphthalene, poly alpha olefin, dodecahydroxy stearic acid, sebacic acid, salicylic acid, boric acid and lithium hydroxide monohydrate in a pressure reaction kettle in proportion;
secondly, adding a proper amount of deionized water into the reaction kettle, and sealing the kettle cover;
thirdly, starting stirring and heating, raising the temperature to 110-135 ℃, and reacting for 30-60 minutes under 0.4 MPa;
and fourthly, after the reaction is finished, slowly opening the pressure release valve until the pressure in the kettle is 0, adding mineral oil, continuously stirring and heating to the temperature of 190 plus materials and 210 ℃, keeping the temperature for 5-15 minutes, stopping heating, and adding ester oil.
Fifthly, cooling the materials in the kettle to below 80 ℃, adding a friction modifier, an antioxidant, an extreme pressure agent and an antirust agent, and grinding the materials into grease by three-roller grinding.
CN202010985623.4A 2020-09-18 2020-09-18 High-temperature lubricating grease for aviation and production method thereof Pending CN112063434A (en)

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CN112812874A (en) * 2021-01-13 2021-05-18 北京航空工程技术研究中心 Lubricating grease for aviation high-temperature motor bearing

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CN112779077A (en) * 2021-01-13 2021-05-11 北京航空工程技术研究中心 Preparation method of lubricating grease for aviation high-temperature motor bearing
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