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Lithium lubricating grease and preparation method thereof

A lithium-based grease and lubricant technology, applied in the field of lubricating oil, to achieve the effects of improving stability, shortening saponification reaction time, and good colloidal stability

Active Publication Date: 2019-05-28
GUANGXI LIUGONG MASCH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The key issues for the application of graphene materials in lithium-based greases are: first, to solve the problem of compound effects between graphene materials and base oils and additives in greases; second, to solve the problem of continuous oxidation and decay of greases during use The anti-effect of the peroxide and oxidative condensate produced by it on the graphene material; in addition, the most critical issue is the uniform dispersion of the graphene material in the lubricating oil and the relationship between the existing dispersant and the base oil and additives. Compatibility issues

Method used

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  • Lithium lubricating grease and preparation method thereof

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preparation example Construction

[0040] The preparation method of described modified graphene is as follows:

[0041] Add 70kg of concentrated sulfuric acid (mass fraction 95%-98%) to S01.1kg flake graphite powder (particle size greater than 400 orders, carbon content greater than 95%); add sodium peroxide and sodium nitrate respectively at 0-10°C, and The amount of addition is based on 1 kg of flake graphite powder, add 0.5 kg of sodium peroxide and 0.5 kg of sodium nitrate, and stir for 2 hours; slowly add 100 kg of water based on 1 kg of flake graphite powder, control the temperature at 80-95 ° C, and stir for 1 hour; Centrifuge at 7200rpm for more than 0.5h to achieve solid-liquid separation; wash with warm water at 50-60°C, and the pH of the water after washing should be greater than 6.5; dry at low temperature at 0-10°C until the water content is less than 1%, and then pass through a 400-mesh sieve, It is graphene oxide powder. Put the mixed gas of helium and nitrogen at a volume ratio of 1:1 into the ...

Embodiment 1

[0060] Embodiment 1 provides a kind of lithium base lubricating grease, the preparation raw material of described lithium base lubricating grease comprises: 0.5 parts of modified graphene containing hydroxyl compound, 80 parts of base oil, 1.5 parts of antiwear agent, 1.2 parts of antirust agent, 0.8 parts of antioxidant, 18 parts of lubricant, 10 parts of thickener, and 1.4 parts of saponifier.

[0061] The preparation method of described hydroxyl compound modified graphene is as follows:

[0062] Add 70kg of concentrated sulfuric acid (mass fraction 95%-98%) to S01.1kg flake graphite powder (particle size greater than 400 orders, carbon content greater than 95%); add sodium peroxide and sodium nitrate respectively at 0-10°C, and The amount of addition is based on 1 kg of flake graphite powder, add 0.5 kg of sodium peroxide and 0.5 kg of sodium nitrate, and stir for 2 hours; slowly add 100 kg of water based on 1 kg of flake graphite powder, control the temperature at 80-95 ° ...

Embodiment 2

[0074] Embodiment 2 provides a kind of lithium-based grease, the preparation raw material of described lithium-based grease comprises: 0.001 part of modified graphene containing hydroxyl compound, 75 parts of base oil, 0.5 part of anti-wear agent, 0.1 part of anti-rust agent, 0.1 part of antioxidant, 5 parts of lubricant, 5 parts of thickener, and 0.6 part of saponifier.

[0075] The anti-wear agent is zinc dialkyl dithiophosphate; the antioxidant is a composition of 2,6-di-tert-butyl-p-cresol and alkyl diphenylamine, and the corresponding weight ratio is 2:3; The lubricant is methyl oleate; the antirust agent is calcium petroleum sulfonate; the thickener is lauryl hydroxystearic acid; and the saponifier is lithium hydroxide monohydrate.

[0076] The preparation method of described hydroxyl compound modified graphene is the same as embodiment 1;

[0077] On the other hand, this embodiment also provides a method for preparing the lithium-based grease, which is the same as that...

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Abstract

The invention discloses lithium lubricating grease. The lithium lubricating grease is prepared from raw materials in parts by weight: 75-88 parts of base oil, 0.5-2.5 parts of an anti-wear agent, 0.1-1.5 parts of an anti-rust agent, 0.1-1.5 parts of an antioxidant, 5-25 parts of a lubricating agent, 5-15 parts of a thickening agent and 0.6-2.0 parts of a saponifying agent. The lithium lubricatinggrease has the advantages of good colloid resistivity, superior mechanical resistivity and the like of traditional lithium lubricating grease, and meanwhile, the anti-wear property of the lithium lubricating grease is greatly improved. Furthermore, the lithium lubricating grease has a superior anti-oxygen property, can significantly shorten the saponifying reaction time, reduce the saponifying reaction temperature, and greatly improve the resistivity, stability and the wear-resistant property of basic lithium lubricating grease, and the lithium lubricating grease can be qualified for the severworking conditions of high temperature, high speed, high load, excessive water and the like.

Description

technical field [0001] The invention relates to the technical field of lubricating oil, in particular to a lithium-based lubricating grease and a preparation method thereof. Background technique [0002] Lubricant plays an extremely important role in industrial production. It can reduce friction, thereby reducing unnecessary energy loss and protecting machinery to extend its service life. Lithium-based grease is a mainstream grease with good mechanical stability, good colloidal stability and excellent water resistance. [0003] Graphene is a new material with a single-layer sheet structure composed of carbon atoms. It is the thinnest but also the hardest nanomaterial in the world. Its thermal conductivity is as high as 5300W / m K, which is higher than that of carbon nanotubes and diamonds. And its resistivity is lower than that of copper or silver, which is the material with the smallest resistivity in the world. Graphene materials are carbon nanomaterials stacked from grap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M139/04C10M169/06C10M177/00C10N50/10C10N30/10C10N30/08C10N30/06
CPCC10M177/00C10N2050/10C10N2010/02C10M2201/041C10M2223/045C10M2207/026C10M2215/064C10M2207/125C10M2219/044C10M2207/1285C10N2030/06C10N2030/10C10N2030/26C10M2219/068C10M2223/047C10M2227/066C10M2219/022C10M2201/066C10M2213/062C10M2203/102C10M2201/065C10M2201/042C10M2201/062C10N2070/00C10M125/02C10N2060/00C10N2010/04C10N2010/12C10N2060/08C10N2010/10C10N2010/08C10N2030/24C10M103/04
Inventor 林博罗金琼梁浩张丽林明智侯国清
Owner GUANGXI LIUGONG MASCH CO LTD
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