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

• the present invention relates to a grease composition that can be used for lubricating various machine parts such as rolling bearings, gears, ball screws, linear motion bearings, cams, and joints.
• the sealing device Since grease can be lubricated without lubrication for a long period of time, the sealing device is simple, the required amount is small, and there is little fouling due to leakage. It is used in many machine parts that have a body. However, since grease is a semi-solid lubricant containing a base oil and a thickener, it has a higher apparent viscosity and a higher stirring resistance than a lubricant. In the past, in order to reduce the agitation resistance of grease, it has been a common practice to make the kinematic viscosity of the base oil as low as possible as in the case of lubricating oil.
• Patent Document 1 proposes a grease composition using a base oil containing a diester oil having a specific structure, and an example describes a diester oil having a kinematic viscosity at 40 ° C. of 20.16 mm 2 / s. Has been. However, if the kinematic viscosity of the base oil of the grease is lowered, the stirring resistance will be reduced. The base oil that can be used is limited because it disappears.
• the problem to be solved by the present invention is to provide a grease composition having a low stirring resistance.
• Another object of the present invention is to provide a mechanical component enclosing the grease composition.
• the present inventors solved this problem by selecting an appropriate thickener. That is, according to the present invention, the following grease composition and machine parts are provided: 1. A thickener, a base oil, the thickener is a diurea compound represented by the following formula (1), and the amount of the thickener in the grease composition is 3 to 20% by mass: Grease composition.
• R 2 represents a diphenylmethane group.
• R 1 and R 3 may be the same or different, and represent a cyclohexyl group or a linear or branched alkyl group having 8 to 22 carbon atoms.
• the ratio of the number of moles of cyclohexyl group to the total number of moles of cyclohexyl group and alkyl group [ ⁇ (number of cyclohexyl groups) / (number of cyclohexyl groups + alkyl group Number) ⁇ ⁇ 100] is 70 to 80 mol%.) 2.
• a grease composition having a low stirring resistance can be provided.
• the grease composition of the present invention can suppress the occurrence of oil film breakage without lowering the kinematic viscosity of the base oil, and can satisfy a sufficiently long life.
• diurea grease As a thickener for grease, diurea grease having a long lubrication life and general versatility is generally used.
• Such diurea grease is represented by the following formula (1):
• R 2 represents a diphenylmethane group. 4,4-diphenylmethane is preferred.
• R 1 and R 3 may be the same or different and each represents a cyclohexyl group or a linear or branched, preferably linear alkyl group having 8 to 22 carbon atoms, preferably 16 to 20 carbon atoms.
• the ratio of the number of moles of cyclohexyl group to the total number of moles of cyclohexyl group and alkyl group [ ⁇ (number of cyclohexyl groups) / (number of cyclohexyl groups + number of alkyl groups) ) ⁇ ⁇ 100] is 70 to 80 mol%.
• the amount of the thickener can be reduced.
• the stirring resistance of the grease can be reduced.
• the content of the thickener is 3 to 20% by mass, preferably 5 to 15% by mass, based on the mass of the grease composition of the present invention.
• Metal soaps, benton, and silica gel do not satisfy heat resistance, that is, bearing lubrication life at high temperatures. Fluorine-based thickeners are very expensive, although they are satisfactory in heat resistance, and lack versatility.
• the type and kinematic viscosity of the base oil in the present invention are not particularly limited.
• the type and kinematic viscosity of the base oil can be selected as necessary.
• the kinematic viscosity at 40 ° C. of the base oil contained in the grease used for the rolling bearing is preferably 10 to 200 mm 2 / s, more preferably 15 to 100 mm 2 / s.
• a base oil may be used individually by 1 type, and may use 2 or more types together.
• the types of base oils that can be used in the present invention are roughly classified into mineral oils and synthetic oils.
• synthetic oils include diester oils, ester-based synthetic oils represented by polyol esters, poly- ⁇ -olefins, synthetic hydrocarbon oils represented by polybutene, ether-based synthetic oils represented by alkyl diphenyl ether, and polypropylene glycol.
• Representative examples include polyglycol-based synthetic oils, silicone-based synthetic oils, and fluorine-based synthetic oils. Of these, synthetic oil is preferred because of its excellent heat resistance. Synthetic hydrocarbon oils and ester synthetic oils are more preferred. When these base oils are included, the stirring resistance at low temperatures can be further reduced.
• the synthetic hydrocarbon oil is preferably poly- ⁇ -olefin.
• ester synthetic oil pentaerythritol ester and trimethylolpropane ester are preferable.
• the grease composition of the present invention can contain any additive as required.
• antioxidants typified by amines and phenols
• inorganic passivating agents such as sodium nitrite, sulfonates, succinic acids, amines, rust inhibitors typified by carboxylates, and benzotriazoles.
• Representative metal corrosion inhibitors, fatty agents such as fatty acids, fatty acid esters and phosphate esters, antiwear and extreme pressure agents such as phosphorus, sulfur and organometallics, metal oxides and disulfides
• solid lubricants typified by molybdenum. The amount of these components used is usually about 0.1 to 20% by mass, preferably 0.5 to 10% by mass.
• the penetration of the grease composition of the present invention is adjusted according to the purpose of use, but is preferably 200 to 440. In particular, for bearings, if it is too soft, there is a concern of leakage, so 200 to 350 is preferable.
• the grease composition of the present invention can be used by being enclosed in various machine parts.
• various machine parts include rolling bearings, gears, ball screws, linear motion bearings, cams, and joints.
• various motors for industrial machines various motors for office equipment, various motors for automobiles, rolling bearings used for automobile electrical parts and auxiliary machine parts, windmills, robots, reduction gears and speed increasers for automobiles, etc.
• ⁇ Test method> ⁇ Agitation resistance (rheometer) The test was performed using a viscoelasticity measuring device manufactured by Anton Paar, Physica MCR301. The test grease was applied between the predetermined plates, and after setting the predetermined distance between the plates, the excess grease that protruded was removed. Then, the shear stress when rotating at the shear rate shown below was read. Test conditions are shown below. Shear rate: 1 to 10 4 s -1 Test temperature: 25 ° C Distance between plates: 0.2mm Plate diameter: 25mm ⁇ Evaluation> An average value of shear stress at a shear rate of 1 to 10 4 s ⁇ 1 was calculated and used as a measurement result. Less than 2000Pa ⁇ ⁇ ⁇ Pass 2000Pa or more ⁇ ⁇ ⁇ Fail

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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)
• Rolling Contact Bearings (AREA)

Priority Applications (4)

Applications Claiming Priority (2)

Publications (1)

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ID=46720917

Family Applications (1)

Country Status (6)

Cited By (1)

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Citations (4)

Family Cites Families (2)

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

Patent Citations (4)

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