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Lubricant

a technology of perfluoropolyether oil and lubricant, which is applied in the field of lubricants, can solve the problems of perfluoropolyether oil not maintaining stable high-temperature characteristics, and achieve the effects of long-term stability, low friction characteristics, and long-term stability

Inactive Publication Date: 2008-07-10
NOK KLUEBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007]An object of the present invention is to provide a lubricant free from considerable deterioration of high-temperature characteristics (high-temperature durability), when used in contact with graphite or molybdenum disulfide such as sintered, oil-impregnated bearings, etc. containing graphite or molybdenum disulfide, or in contact with metallic parts such as ball bearings, etc. containing graphite or molybdenum disulfide, or even used in contact with aluminum materials including aluminum material as sliding members.Means for Solving the Problem
[0010]The perfluoropolyether oils having a kinematic viscosity at 40° C. of 50-1,500 mm2 / sec. can maintain the volatility and stability for a long time, even if used at higher temperature more than 150° C. in the presence of a solid lubricant such as graphite, molybdenum disulfide, etc., thereby attaining a longer life of parts to be used. Particularly, perfluoropolyether oils having a kinematic viscosity of 50-250 mm2 / sec., preferably 65-200 mm2 / sec., have distinguished low-temperature characteristics as well.
[0012]The high-temperature characteristics (high-temperature durability) of perfluoropolyether oils are drastically lowered also when used in contact with aluminum materials including aluminum material as sliding members, but the present lubricant never undergoes considerable deterioration of high-temperature characteristics, even when used in such a case as above. That is, the present lubricant can maintain the volatility or stability for a long time and can show a lubricability in various sliding operations, even if used in the presence of aluminum materials at higher temperature more than 150° C. or 200° C., thereby attaining an extremely longer life of parts to be used.

Problems solved by technology

Lubricating oil compositions comprising a perfluoropolyether oil as a base oil have been so far used in such situations, and have been inevitably brought into and kept with contact with some kinds of metals or solid lubricants having a very large surface area, so even the perfluoropolyether oils fail to maintain stable high-temperature characteristics, depending on their structures.

Method used

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Examples

Experimental program
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Effect test

example 1

[0034]The following three kinds of perfluoropolyether base oils were admixed with 10% by weight of graphite powder (flake graphite powder CB-150, a product of Japan Graphite Co.; fixed carbon content: 98.0% or more, and average particle size: 40 μm), or molybdenum disulfide (LM13-SM powder, a product of Daito Lubricant Manufacturing Co.; average particle size: 0.4 μm) on the basis of the sample, and 0.6 g each of the samples was sampled into individual glass dishes, 36 mm in diameter, smeared onto the dish surfaces in a uniform thin film state, and left standing in a thermostat tank at 200° C. to determine changes in percent oil weight loss with time.

[0035]The results are shown graphically in FIG. 1, where[0036]: F(CF2CF2CF2O)mC2F5 (kinetic viscosity at 40° C.: 100 mm2 / sec.)[0037]◯: +graphite[0038]▴: RfO[CF(CF3)CF2O]p(CF2CF2O)qRf′ (kinetic viscosity at 140° C.: 180 mm2 / sec.)[0039]Δ: +graphite[0040]▪: RfO(CF2CF2O)m(CF2O)nRf′ (kinetic viscosity at 40° C.: 160 mm2 / sec.)[0041]: +graphi...

example 2

[0044]The following perfluoropolyether base oils (A) or (B) having various kinetic viscosities at 40° C. were admixed with 10% by weight of aluminum powder (a product of Wako Pure Chemical Co., purity: 99.5%, and particle sizes: 53-150 μm) on the basis of the sample, and 0.3 ml each of the samples was sampled into individual glass dishes, 37 mm in diameter, smeared onto the dish surfaces in a uniform thin film states and left standing in a thermostat tank at 250° C. to determine weights of entire glass dishes after 100 hours, thereby calculating percent oil weight losses.

[0045]Perfluoropolyether oil (A): F(CF2CF2CF2O)mC2F5 [0046]Kinetic viscosity at 40° C. (A-1) 65 mm2 / sec.[0047](A-2) 100 mm2 / sec.[0048](A-3) 200 mm2 / sec.[0049](A-4) 23 mm2 / sec.

[0050]Perfluoropolyether oil (B): RfO[CF(CF3)CF2O)pRf′[0051]Kinetic viscosity at 40° C. (B-1) 180 mm2 / sec.[0052](B-2) 400 mm2 / sec.[0053](B-3) 25 mm2 / sec.[0054](B-4) 1200 mm2 / sec.

[0055]Perfluoropolyether oil (C): RfO(CF2CF2O)m(CF2O)nRf′[0056]Kin...

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Abstract

A lubricant in the form of lubricating oil or grease, for use in contact with graphite or molybdenum disulfide or in contact with aluminum materials, which comprises a perfluoropolyether oil free from (CF2O)n groups as a repeat unit of polymer and having a kinetic viscosity at 40° C. of 50-1,500 mm2 / sec., as a base oil, where F(CF2CF2CF2O)mC2F5 or RfO[CF(CF3)CF2O]p(CF2CF2O)qRf′ s used as the perfluoropolyether base oil. The lubricant undergoes no considerable deterioration of high-temperature characteristics (high-temperature durability), even if used in various uses as mentioned above, and also has distinguished low-temperature characteristics when the base oil has a kinetic viscosity of 50-250 mm2 / sec.

Description

TECHNICAL FIELD[0001]The present invention relates to a lubricant, and more particularly to a lubricant comprising a lubricating oil or a grease for use in contact with graphite or molybdenum disulfide such as sintered, oil-impregnated bearings containing graphite or molybdenum disulfide or for use in contact with aluminum materials such as sliding members, etc., formed from aluminum materials.BACKGROUND ART[0002]Sintered, oil-impregnated bearings comprises porous bodies made compression of several kinds of solid powder obtained by adding solid lubricants such as graphite, molybdenum disulfide, carbon black, etc. to metal powders such as iron, copper, tin, zinc, etc. The sintered, oil-impregnated bearings can be used without any addition of oil owing to the self-lubrication action of a small amount of initially impregnated lubricant. Thus, it is important for the life of bearings that the a sufficient amount of lubricant can be retained in the bearings and can be stably used for a l...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10M107/38
CPCC10M107/38C10M2201/041C10M2201/066C10M2211/063C10M2211/066C10M2213/06C10N2250/10C10N2220/022C10N2230/02C10N2230/06C10N2230/08C10N2240/02C10M2213/0606C10N2020/02C10N2030/02C10N2030/06C10N2030/08C10N2040/02C10N2050/10C10M105/54C10M169/02
Inventor HASHIDA, MIYUKISAWAGUCHI, WATARUNITTA, TOSHIOHASHIMOTO, TATSUYASHIMURA, AKIHIKOYURIMOTO, JIRO
Owner NOK KLUEBER CO LTD
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