US20130310292A1 - Grease composition - Google Patents
Grease composition Download PDFInfo
- Publication number
- US20130310292A1 US20130310292A1 US13/983,665 US201213983665A US2013310292A1 US 20130310292 A1 US20130310292 A1 US 20130310292A1 US 201213983665 A US201213983665 A US 201213983665A US 2013310292 A1 US2013310292 A1 US 2013310292A1
- Authority
- US
- United States
- Prior art keywords
- grease composition
- thickener
- cyclohexyl group
- alkyl group
- group
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 0 [1*]NC(=O)N[2*]NC(=O)N[3*] Chemical compound [1*]NC(=O)N[2*]NC(=O)N[3*] 0.000 description 6
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)
Abstract
The invention provides a grease composition which contains a base oil and a thickener, where the thickener is a diurea compound represented by formula (1), and the thickener is contained in an amount of 3 to 20 mass % in the grease composition:
wherein R2 is diphenylmethane group; and R1 and R3, 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 %.
Description
- The present invention relates to a grease composition that can be used for lubricating a variety of mechanical parts such as rolling bearings, gear wheels, ball threads, linear motion bearings, cams, joints or the like.
- From the recent perspective of reduction in energy consumption, not only the automobile, but also the electrical machinery and appliances and mechanical parts used in any industries have been required to improve the operating efficiency. In line with this, extensive studies have been made in terms of weight reduction of the parts, improvement of the structure, and the like. In particular, the mechanical parts having a rotating body are subject to energy loss due to the resistance generated by stirring the lubricant. Therefore, there has been a demand for a lubricant with reduced resistance to stirring.
- By way of example, 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)). However, 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.
- To lower the resistance to stirring of the grease, it has been regarded as the usual measures to make the kinematic viscosity of base oil as low as possible, which is the same as in the case of lubricating oil. For example, 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 mm2/s.
- When the kinematic viscosity of the base oil used in the grease is lowered, the resistance to stirring can be lowered, but the problem of broken oil film occurs as described in the case of lubricating oil, so that a sufficient life, i.e., flaking life or seizure life cannot be satisfactorily ensured. In light of the above, the base oils that can be used are limited.
- 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.
- Namely, the invention provides the following grease composition and mechanical part:
- 1. 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:
- wherein R2 is diphenylmethane group; and R1 and R3, 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 %.
- 2. The grease composition described in the above-mentioned item 1, wherein the thickener is the diurea compound of formula (I) where the alkyl group is a straight-chain alkyl group having 16 to 20 carbon atoms.
- 3. The grease composition described in the above-mentioned item 1 or 2, used for a rolling bearing, gear wheel, ball thread, linear motion bearing, cam, or joint.
- 4. A mechanical part where the grease composition described in any one of the above-mentioned items 1 to 3 is enclosed.
- 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.
- In general, diurea compounds are widely used as the thickener for grease because diurea grease can exhibit long lubricating life and excellent versatility. A diurea grease is chosen in the invention, which is prepared by using an alicyclic amine and an aliphatic amine together at a particular molar ratio. The thus prepared diurea compound of grease is represented by the following formula (I):
- In the formula (I), R2 is diphenylmethane group, preferably 4,4-diphenylmethane. R1 and R3, 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. In formula (I), 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. When the above-mentioned thickener is contained in the base oil in a particular amount, the resistance to stirring of the resultant grease can be lowered. To be more specific, 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.
- Metallic soaps, Benton and silica gel cannot satisfy the requirement of heat-resistance, that is, the lubrication life of bearings at high temperatures. Fluorine-containing thickeners are considerably expensive and lacking in versatility although the heat resistance is satisfactory.
- 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. When used in the rolling bearings, however, the grease may comprise a base oil preferably having a kinematic viscosity at 40° C. of 10 to 200 mm2/s, more preferably 15 to 100 mm2/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. Examples of the synthetic oils include ester type synthetic oils such as diester oils and polyol ester oils, synthetic hydrocarbon oils such as poly α-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. In particular, 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. Among the synthetic hydrocarbon oils, poly α-olefin oils are preferable. Among the ester type synthetic oils, pentaerythritol ester and trimethylolpropane ester are preferable.
- The grease composition of the invention may further comprise any additives when necessary. Examples of the additives include an antioxidant such as amine-based and phenol-based antioxidants; an inorganic passivator such as sodium nitrite or the like; a rust inhibitor such as sulfonate-, succinic acid-, amine-, and carboxylate-based rust inhibitors; a metallic corrosion inhibitor such as benzotriazole or the like, an oiliness improver such as fatty acids, fatty acid esters, phosphates and the like; a phosphorus-containing, sulfur-containing or organic metal-containing antiwear agent or extreme-pressure agent; and a solid lubricant such as oxidized metal salts, molybdenum disulfide or the like. The contents of such additives may generally be about 0.1 to 20 mass %, preferably 0.5 to 10 mass %.
- 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. When the grease composition is used for bearings, the worked penetration of the grease composition may preferably be in the range of 200 to 350 because too soft grease may unfavorably leak.
- The grease composition of the invention can be enclosed in a variety of mechanical parts in practice. The mechanical parts include rolling bearings, gear wheels, ball threads, linear motion bearings, cams, joints or the like. More specifically, the grease composition of the invention can be used for the rolling bearings employed in a variety of motors for industrial machines, office equipment and automobiles, and in automotive electrical equipment and automotive auxiliaries; the gear wheels used for the reduction gear and the multiplying gear in windmills, robots, automobiles and the like; ball threads used in electric-powered steering, machine tools and the like; linear motion bearings, cams or joints used in the industrial machines, electronic equipment and the like.
- Grease compositions according to Examples and Comparative Examples were prepared using thickeners and base oils as shown in Table 1. In particular, 4,4-diphenylmethane diisocyanate was reacted with one or more predetermined amines in each base oil, and the reaction mixture was heated and then cooled. The resultant mixture was kneaded using a three-roll mill, whereby grease compositions according to Examples 1 and 2 and Comparative Examples 1 to 9 were obtained. A synthetic hydrocarbon oil, i.e., a poly α-olefin oil having a kinematic viscosity of 70.2 mm2/s at 40° C. when measured in accordance with JIS K 2220 23, or a diester oil, i.e., dioctyl sebacate having a kinematic viscosity of 11.6 mm2/s at 40° C. was used as the base oil.
- The amount of thickener was adjusted in such a manner that the worked penetration of the resultant grease composition reached 300 (when determined in accordance with the JIS K2220 7.).
- The grease compositions thus prepared were evaluated by the test methods shown below. The results are shown in Table 1.
- Resistance to Stirring (Rheometer)
- Using a commercially available viscoelasticity measuring apparatus, Physica MCR301 made by Anton Paar GmbH, the test was carried out.
- 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.
- The test conditions are given below.
- Shear rate: 1 to 104s−1
- Temperature: 25° C.
- Distance between plates: 0.2 mm
- Diameter of plates: 25 mm
- From the shear stress values obtained within a shear rate range of 1 to 104s−1 the average was calculated, which was regarded as the test result.
- Less than 2000 Pa: acceptable
- 2000 Pa or more: unacceptable
-
TABLE 1 Comp. Comp. Comp. Comp. Comp. Comp. Comp. Comp. Comp. Ex. 1 Ex. 2 Ex. 1 Ex. 2 Ex. 3 Ex. 4 Ex. 5 Ex. 6 Ex. 7 Ex. 8 Ex. 9 Thick- 4,4-diphenyl- 50 50 50 50 50 50 50 50 50 50 50 ener methane (Molar diisocyanate ratio) Cyclo- 80 70 90 60 50 30 20 100 hexylamine Octa- 20 30 10 40 50 70 80 decylamine Octylamine 100 p-toluidine 100 100 Base oil Synthetic Balance Balance Balance Balance Balance Balance Balance Balance Balance Balance hydro- carbon oil Diester oil Balance Amount of thickener 8 7 11 10 11 12 12 14 11 20 20 (mass %) Worked penetration 300 300 300 300 300 300 300 300 300 300 300 Resistance to stirring 1721 1674 2138 2092 2107 2201 2195 2688 2101 3622 2955 (Rheometer): Average of shear stress values (Pa) within shear rate range of 1 to 104s−1 at 25° C. Evaluation Accept- Accept- Unaccept- Unaccept- Unaccept- Unaccept- Unaccept- Unaccept- Unaccept- Unaccept- Unaccept- able able able able able able able able able able able - The grease compositions of Examples 1 and 2 where diurea thickeners specified in the invention were contained exhibited low shear stress (i.e., excellent resistance to stirring), while the grease compositions of Comparative Examples 1 to 9 not containing the diurea thickener as specified in the invention exhibited high shear stress. Comparative Example 9 showed high shear stress although a diester oil with a low viscosity was used as the base oil. The reason for this is that the thickener was not a diurea thickener according to the invention.
Claims (4)
1. A grease composition comprising a base oil and a thickener, where the thickener is a diurea compound represented by formula (I), and the thickener is contained in an amount of 3 to 20 mass % in the grease composition:
wherein R2 is diphenylmethane group; and R1 and R3, 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 %.
2. The grease composition of claim 1 , wherein the thickener is the diurea compound of formula (I) where the alkyl group is a straight-chain alkyl group having 16 to 20 carbon atoms.
3. The grease composition of claim 1 , used for a rolling bearing, gear wheel, ball thread, linear motion bearing, cam, or joint.
4. A mechanical part where the grease composition of claim 1 is enclosed.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2011035734A JP2012172066A (en) | 2011-02-22 | 2011-02-22 | Grease composition |
JP2011-035734 | 2011-02-22 | ||
PCT/JP2012/054256 WO2012115141A1 (en) | 2011-02-22 | 2012-02-22 | Grease composition |
Publications (1)
Publication Number | Publication Date |
---|---|
US20130310292A1 true US20130310292A1 (en) | 2013-11-21 |
Family
ID=46720917
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/983,665 Abandoned US20130310292A1 (en) | 2011-02-22 | 2012-02-22 | Grease composition |
Country Status (6)
Country | Link |
---|---|
US (1) | US20130310292A1 (en) |
JP (1) | JP2012172066A (en) |
KR (1) | KR20130118936A (en) |
CN (1) | CN103415603B (en) |
DE (1) | DE112012000940T5 (en) |
WO (1) | WO2012115141A1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20110059875A1 (en) * | 2008-05-09 | 2011-03-10 | Kyodo Yushi Co., Ltd. | Grease composition for constant velocity joint and the constant velocity joint |
WO2016125859A1 (en) | 2015-02-05 | 2016-08-11 | 出光興産株式会社 | Grease and method for manufacturing grease |
US20180112147A1 (en) * | 2016-10-21 | 2018-04-26 | Jtekt Corporation | Grease Composition and Rolling Bearing in Which Grease Composition is Sealed |
US10584750B2 (en) | 2014-03-12 | 2020-03-10 | Kyodo Yushi Co., Ltd. | Grease composition and grease-filled wheel bearing |
US11155766B2 (en) | 2016-07-26 | 2021-10-26 | Kyodo Yushi Co., Ltd. | Grease composition |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6348050B2 (en) * | 2014-11-05 | 2018-06-27 | 日本グリース株式会社 | Biodegradable grease composition for wind power generator |
JP6750215B2 (en) * | 2015-12-17 | 2020-09-02 | 日本精工株式会社 | Telescopic shaft for vehicle steering shaft and electric power steering device |
WO2017171020A1 (en) * | 2016-03-31 | 2017-10-05 | 出光興産株式会社 | Lubricating oil composition, and precision reduction gear using same |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20110160105A1 (en) * | 2008-07-07 | 2011-06-30 | Keiji Tanaka | Grease composition |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2979274B2 (en) * | 1992-06-29 | 1999-11-15 | 日本精工株式会社 | Grease composition for high-speed rolling bearings |
JP2008286230A (en) * | 2007-05-15 | 2008-11-27 | Nsk Ltd | Rolling bearing for motor |
JP2009108263A (en) * | 2007-10-31 | 2009-05-21 | Nsk Ltd | Grease composition and rolling bearing |
JP5191219B2 (en) * | 2007-11-28 | 2013-05-08 | コスモ石油ルブリカンツ株式会社 | Grease composition |
JP5467727B2 (en) * | 2008-02-22 | 2014-04-09 | 協同油脂株式会社 | Grease composition and bearing |
-
2011
- 2011-02-22 JP JP2011035734A patent/JP2012172066A/en active Pending
-
2012
- 2012-02-22 CN CN201280009920.9A patent/CN103415603B/en active Active
- 2012-02-22 US US13/983,665 patent/US20130310292A1/en not_active Abandoned
- 2012-02-22 WO PCT/JP2012/054256 patent/WO2012115141A1/en active Application Filing
- 2012-02-22 DE DE112012000940T patent/DE112012000940T5/en not_active Ceased
- 2012-02-22 KR KR1020137020084A patent/KR20130118936A/en not_active Application Discontinuation
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20110160105A1 (en) * | 2008-07-07 | 2011-06-30 | Keiji Tanaka | Grease composition |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20110059875A1 (en) * | 2008-05-09 | 2011-03-10 | Kyodo Yushi Co., Ltd. | Grease composition for constant velocity joint and the constant velocity joint |
US10584750B2 (en) | 2014-03-12 | 2020-03-10 | Kyodo Yushi Co., Ltd. | Grease composition and grease-filled wheel bearing |
WO2016125859A1 (en) | 2015-02-05 | 2016-08-11 | 出光興産株式会社 | Grease and method for manufacturing grease |
US11155766B2 (en) | 2016-07-26 | 2021-10-26 | Kyodo Yushi Co., Ltd. | Grease composition |
US20180112147A1 (en) * | 2016-10-21 | 2018-04-26 | Jtekt Corporation | Grease Composition and Rolling Bearing in Which Grease Composition is Sealed |
Also Published As
Publication number | Publication date |
---|---|
DE112012000940T5 (en) | 2013-11-21 |
CN103415603A (en) | 2013-11-27 |
KR20130118936A (en) | 2013-10-30 |
JP2012172066A (en) | 2012-09-10 |
CN103415603B (en) | 2017-04-26 |
WO2012115141A1 (en) | 2012-08-30 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US20130310292A1 (en) | Grease composition | |
US10005980B2 (en) | Grease composition and bearing | |
EP1930400B1 (en) | Lubricant composition | |
JP6546727B2 (en) | Grease composition | |
EP2687584B1 (en) | Grease composition | |
EP2933321B1 (en) | Grease composition ameliorating low-temperature fretting | |
US10584750B2 (en) | Grease composition and grease-filled wheel bearing | |
JP5738712B2 (en) | Grease composition | |
US20070173420A1 (en) | Grease composition and rolling device | |
US9567545B2 (en) | Grease composition for EV/HEV driving motor bearing and EV/HEV driving motor bearing | |
EP2264132B1 (en) | Grease composition and bearings | |
KR101654116B1 (en) | Grease composition for hub unit bearing | |
JP2024051124A (en) | Grease composition | |
JP5766425B2 (en) | Grease composition | |
JP5571924B2 (en) | Grease composition and rolling bearing enclosing the grease composition | |
JP5734269B2 (en) | Lubricating grease composition | |
JP5165921B2 (en) | Grease composition | |
EP3178910B1 (en) | Grease composition | |
JP2013253257A (en) | Grease composition and bearing | |
JP2006316082A (en) | Grease composition and grease-sealed rolling bearing | |
WO2023182532A1 (en) | Grease composition | |
JP2006077205A (en) | Grease composition for direct-acting device and direct-acting device | |
WO2023182533A1 (en) | Grease composition | |
JP2003201494A (en) | Lubricant composition |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: KYODO YUSHI CO., LTD., JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:YAMAMOTO, MASAMICHI;SATO, YUTA;REEL/FRAME:030942/0367 Effective date: 20130626 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |