Classifications

• • 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
  • C10M115/00—Lubricating compositions characterised by the thickener being a non-macromolecular organic compound other than a carboxylic acid or salt thereof
  • C10M115/08—Lubricating compositions characterised by the thickener being a non-macromolecular organic compound other than a carboxylic acid or salt thereof containing nitrogen
• • 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
  • C10M169/02—Mixtures of base-materials and thickeners
• • 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
  • C10M2203/02—Well-defined aliphatic compounds
  • C10M2203/0206—Well-defined aliphatic 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
  • 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
  • C10M2205/028—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers containing aliphatic monomers having more than four carbon atoms
  • C10M2205/0285—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers containing aliphatic monomers having more than four carbon atoms 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
  • C10M2207/28—Esters
  • C10M2207/282—Esters of (cyclo)aliphatic oolycarboxylic acids
  • C10M2207/2825—Esters of (cyclo)aliphatic oolycarboxylic acids 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
  • C10M2207/28—Esters
  • C10M2207/283—Esters of polyhydroxy compounds
  • C10M2207/2835—Esters of polyhydroxy 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
  • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
  • C10M2215/10—Amides of carbonic or haloformic acids
  • C10M2215/102—Ureas; Semicarbazides; Allophanates
  • C10M2215/1026—Ureas; Semicarbazides; Allophanates used as thickening material
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • 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
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2040/00—Specified use or application for which the lubricating composition is intended
  • C10N2040/02—Bearings
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2040/00—Specified use or application for which the lubricating composition is intended
  • C10N2040/04—Oil-bath; Gear-boxes; Automatic transmissions; Traction drives
• • C—CHEMISTRY; METALLURGY
  • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
  • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
  • C10N2050/00—Form in which the lubricant is applied to the material being lubricated
  • C10N2050/10—Semi-solids; greasy
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
  • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
  • F16C33/30—Parts of ball or roller bearings
  • F16C33/66—Special parts or details in view of lubrication
  • F16C33/6603—Special parts or details in view of lubrication with grease as lubricant
  • F16C33/6633—Grease properties or compositions, e.g. rheological properties

Definitions

• lowering the viscosities of engine oils and transmission oils is proposed to decrease the resistance to stirring of the employed lubricating oils (Tohyama, Ohmori, Tsutsui and Yamamoto, “Low Friction Gasoline Engine Oil—Effects of Lower Viscosity and Friction Modifiers-” R&D Review of Toyota CRDL, Vol. 32, No. 4 (December 1997); and Kanamoto, Ueno, Katayama and Satou, “Transmission Technology Trends and Product Developments” NTN Technical Review, No. 75 (2007)).
• the above-mentioned measures may lead to broken oil film resulting from the lowered oil viscosities, which may raise concern about damage on the surface to be lubricated.
• Grease has advantages over lubricating oil in that lubrication can be realized with no supply for an extended period of time, the seal for grease can be made simpler, the amount necessary for lubrication is smaller, damages due to the leakage can be reduced, and the like. Therefore, most of the mechanical parts having rotating bodies employ the grease. On the other hand, however, the grease has higher apparent viscosity and larger resistance to stirring than the lubricating oil because the grease is a semi-solid lubricant comprising a base oil and a thickener.
• JP 2009-132754 A proposes a grease composition comprising a base oil which contains a diester oil having a particular structure, and describes in Examples the use of a diester oil having a kinematic viscosity at 40° C. of 20.16 mm 2 /s.
• An object of the invention is to provide a grease composition with lowered resistance to stirring.
• Another object of the invention is to provide a mechanical part where the above-mentioned grease composition is enclosed.
• the inventors of the invention have solved the above-mentioned problems by choosing a proper thickener.
• the invention provides the following grease composition and mechanical part:
• a grease composition comprising a base oil and a thickener, where the thickener is a diurea compound represented by formula (I) shown below, and the thickener is contained in an amount of 3 to 20 mass % in the grease composition:
• R 2 is diphenylmethane group
• R 1 and R 3 which may be the same or different represent cyclohexyl group or a straight-chain or branched alkyl group having 8 to 22 carbon atoms, with the ratio of the number of moles of the cyclohexyl group to the total number of moles of the cyclohexyl group and the alkyl group, expressed as [((the number of the cyclohexyl group)/(the number of the cyclohexyl group+the number of the alkyl group)) ⁇ 100] being 70 to 80 mol %.
• the present invention can provide a grease composition with lowered resistance to stirring.
• the grease composition of the invention can reduce the occurrence of broken oil film to meet a sufficiently long life, without decreasing the kinematic viscosity of the base oil.
• R 2 is diphenylmethane group, preferably 4,4-diphenylmethane.
• R 1 and R 3 which may be the same or different represent cyclohexyl group, or a straight-chain or branched alkyl group, preferably a straight-chain alkyl group, having 8 to 22 carbon atoms, preferably 16 to 20 carbon atoms.
• the ratio of the number of moles of the cyclohexyl group to the total number of moles of the cyclohexyl group and the alkyl group, expressed as [((the number of cyclohexyl group)/(the number of cyclohexyl group+the number of alkyl group)) ⁇ 100] is 70 to 80 mol %.
• the choice of the above-mentioned thickener can lessen the amount of thickener.
• the amount of the thickener is in a range of 3 to 20 mass %, preferably 5 to 15 mass %, based on the total mass of the grease composition according to the invention.
• the kind and the kinematic viscosity of the base oil used in the invention are not particularly limited. It is possible to choose any kind of base oil having any kinematic viscosity as the occasion demands.
• the grease may comprise a base oil preferably having a kinematic viscosity at 40° C. of 10 to 200 mm 2 /s, more preferably 15 to 100 mm 2 /s.
• One kind of base oil may be used alone or two or more kinds of base oils may be used in combination.
• the base oils that can be used in the invention are roughly classified into mineral oils and synthetic oils.
• the synthetic oils include ester type synthetic oils such as diester oils and polyol ester oils, synthetic hydrocarbon oils such as poly ⁇ -olefin oils and polybutene, ether type synthetic oils such as alkyl diphenyl ethers, polyglycol type synthetic oils such as polypropylene glycols, silicone type synthetic oils, and fluorinated synthetic oils.
• the synthetic oils are preferred because of the excellent heat resistance.
• synthetic hydrocarbon oils and ester type synthetic oils are preferable. Use of such synthetic oils for the base oil can lower the resistance to stirring at low temperatures.
• the synthetic hydrocarbon oils poly ⁇ -olefin oils are preferable.
• the ester type synthetic oils pentaerythritol ester and trimethylolpropane ester are preferable.
• the worked penetration of the grease composition according to the invention which may be adjusted according to the application of grease is preferably 200 to 440.
• the worked penetration of the grease composition may preferably be in the range of 200 to 350 because too soft grease may unfavorably leak.
• a test grease was applied between predetermined plates, which were controlled to have a predetermined gap, and the extra grease pressed out from the edge was removed. Then, the plates were rotated at a shear rate as shown below and the shear stress was read.
• test conditions are given below.
• Diameter of plates 25 mm

Landscapes

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

Applications Claiming Priority (3)

Publications (1)

Family

ID=46720917

Family Applications (1)

Country Status (6)

Cited By (5)

Families Citing this family (3)

Citations (1)

Family Cites Families (5)

• 2011
  • 2011-02-22 JP JP2011035734A patent/JP2012172066A/ja active Pending
• 2012
  • 2012-02-22 WO PCT/JP2012/054256 patent/WO2012115141A1/ja active Application Filing
  • 2012-02-22 CN CN201280009920.9A patent/CN103415603B/zh active Active
  • 2012-02-22 DE DE112012000940T patent/DE112012000940T5/de not_active Ceased
  • 2012-02-22 KR KR1020137020084A patent/KR20130118936A/ko not_active Application Discontinuation
  • 2012-02-22 US US13/983,665 patent/US20130310292A1/en not_active Abandoned

Patent Citations (1)

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