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Lubricating grease composition and method for producing the same

a technology of lubricating grease and composition, which is applied in the direction of lubricant composition, petroleum industry, base materials, etc., can solve the problems of increased friction coefficient, poor compatibility with materials to be lubricated, and high cost, and achieves heat resistance (degree of oil separation), excellent abrasion resistance, and shear stability. , the effect of improving abrasion resistan

Inactive Publication Date: 2011-09-08
NOK KLUEBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0021]The lubricating grease composition of the present invention has excellent abrasion resistance, load resistance, heat resistance (degree of oil separation), and shear stability (consistency change). Particularly, compared with the lubricating grease composition disclosed in Patent Document 6, the lubricating grease composition of the present invention has improved abrasion resistance and ensures cost reduction.
[0022]More specifically, in abrasion scar diameter measurement using the Shell four-ball test, the lubricating grease composition (perfluoropolyether oil: 80 wt. %, lithium azelate: 15 wt. %, and PTFE: 5 wt. %) of

Problems solved by technology

However, the base oil and thickener both contain fluorine, and thus have such problems as high cost; poor compatibility with materials to be lubricated, such as resins, metals, rubber, etc.
; failure to form oil films necessary for lubrication under high-load conditions, causing abrasion, and resulting in increased friction coefficients, so that the torque transmission efficiency is lowered; and poor rust prevention and corrosion resistance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

reference example 1

[0052]In a poly-α-olefin oil (40° C. viscosity: 30 mm2 / sec.), a barium complex soap of sebacic acid and sebacic acid monostearylamide, accounting for 30 wt. % of the base grease as a thickener, was synthesized by the process (a-1) described above. To the barium complex soap, 2 wt. % of amine-based antioxidant (NA-LUBE AO-120, a product of King Industries, Inc.; alkyl diphenylamine) was added, and the mixture was kneaded twice by a three-roll mill, thereby producing a grease A.

reference example 2

[0053]In a poly-α-olefin oil (40° C. viscosity: 46 mm2 / sec.), a barium complex soap of azelaic acid and azelaic acid monooctylamide, accounting for 25 wt. % of the base grease as a thickener, was synthesized by the process (a-1) described above. To the barium complex soap, 3 wt. % of oiliness agent (trimethylolpropane alkyl ester; 40° C. viscosity: 30 mm2 / sec.) and 2 wt % of amine-based antioxidant (NA-LUBE AO-120) were added, and the mixture was kneaded twice by a three-roll mill, thereby producing a grease B.

reference example 3

[0054]In a diphenyl ether oil (40° C. viscosity: 100 mm2 / sec.), a barium complex soap of sebacic acid and sebacic acid monostearylamide, accounting for 30 wt. % of the base grease as a thickener, was synthesized by the process (a-1) described above. To the barium complex soap, 2 wt. % of amine-based antioxidant (NA-LUBE AO-120) was added, and the mixture was kneaded twice by a three-roll mill, thereby producing a grease C.

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Abstract

Disclosed is a lubricating grease composition comprising a complex metal soap thickener of aliphatic dicarboxylic acid and monoamide monocarboxylic acid, and a fluororesin powder contained in a base oil mixture of a non-fluorine-based base oil and a fluorine-based base oil, which are incompatible with each other. The lubricating grease composition can be produced by kneading, preferably kneading by a three-roll mill, a non-fluorine-based grease and a fluorine-based grease, the non-fluorine-based grease being prepared by stirring a non-fluorine-based base oil, aliphatic dicarboxylic acid, and monoamide monocarboxylic acid under heating, and adding metal hydroxide thereto to form a complex metal soap in the non-fluorine-based base oil; and the fluorine-based grease being prepared from a fluorine-based base oil and a fluororesin powder.

Description

TECHNICAL FIELD[0001]The present invention relates to a lubricating grease composition and a method for producing the same. More particularly, the present invention relates to a lubricating grease composition comprising a base oil mixture of a non-fluorine-based base oil and a fluorine-based base oil, which are incompatible with each other; and a method for producing the composition.BACKGROUND ART[0002]Conventional fluorine-based greases comprise a perfluoropolyether oil as a base oil, a homopolymer of tetrafluoroethylene [PTFE], a copolymer of tetrafluoroethylene and hexafluoropropene [HFP], or the like as a thickener, and small amounts of additives, such as rust inhibitors. They are used under severe conditions requiring, for example, low-temperature characteristics, high-temperature durability, oxidation stability, and chemical resistance.[0003]However, the base oil and thickener both contain fluorine, and thus have such problems as high cost; poor compatibility with materials to...

Claims

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Application Information

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IPC IPC(8): C10M107/38
CPCC10M169/02C10N2240/202C10M2207/0406C10M2207/1276C10M2207/283C10M2213/0606C10M2213/0626C10M2215/064C10N2230/06C10N2230/68C10N2240/02C10N2250/10C10M2205/0206C10N2240/04C10N2270/00C10M2205/0285C10M2207/1236C10M2207/1285C10M2215/0813C10N2230/08C10N2210/02C10N2210/01C10N2030/06C10N2030/08C10N2040/02C10N2040/04C10N2050/10C10N2070/00C10N2030/68C10N2040/17C10N2010/02C10N2010/04
Inventor HISHINUMA, TAKESHIHASHIMOTO, TATSUYANITTA, TOSHIO
Owner NOK KLUEBER CO LTD
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