EP3256552B1 - Grease composition - Google Patents
Grease composition Download PDFInfo
- Publication number
- EP3256552B1 EP3256552B1 EP16703553.4A EP16703553A EP3256552B1 EP 3256552 B1 EP3256552 B1 EP 3256552B1 EP 16703553 A EP16703553 A EP 16703553A EP 3256552 B1 EP3256552 B1 EP 3256552B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- grease composition
- base oil
- thickener
- weight
- grease
- 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.)
- Active
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- 239000004519 grease Substances 0.000 title claims description 34
- 239000000203 mixture Substances 0.000 title claims description 33
- 239000002199 base oil Substances 0.000 claims description 22
- 239000002562 thickening agent Substances 0.000 claims description 13
- -1 fatty acid salt Chemical class 0.000 claims description 10
- 229920013639 polyalphaolefin Polymers 0.000 claims description 10
- 235000014113 dietary fatty acids Nutrition 0.000 claims description 8
- 239000000194 fatty acid Substances 0.000 claims description 8
- 229930195729 fatty acid Natural products 0.000 claims description 8
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 8
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 7
- 229910052791 calcium Inorganic materials 0.000 claims description 7
- 239000011575 calcium Substances 0.000 claims description 7
- 230000000052 comparative effect Effects 0.000 description 7
- 229920000459 Nitrile rubber Polymers 0.000 description 6
- 239000000654 additive Substances 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 239000012990 dithiocarbamate Substances 0.000 description 4
- 239000000314 lubricant Substances 0.000 description 4
- 229910052750 molybdenum Inorganic materials 0.000 description 4
- 239000011733 molybdenum Substances 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 229910052725 zinc Inorganic materials 0.000 description 4
- 239000011701 zinc Substances 0.000 description 4
- 230000000996 additive effect Effects 0.000 description 3
- NLZUEZXRPGMBCV-UHFFFAOYSA-N Butylhydroxytoluene Chemical compound CC1=CC(C(C)(C)C)=C(O)C(C(C)(C)C)=C1 NLZUEZXRPGMBCV-UHFFFAOYSA-N 0.000 description 2
- 239000005069 Extreme pressure additive Substances 0.000 description 2
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 2
- XQVWYOYUZDUNRW-UHFFFAOYSA-N N-Phenyl-1-naphthylamine Chemical compound C=1C=CC2=CC=CC=C2C=1NC1=CC=CC=C1 XQVWYOYUZDUNRW-UHFFFAOYSA-N 0.000 description 2
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 2
- 239000003963 antioxidant agent Substances 0.000 description 2
- 235000006708 antioxidants Nutrition 0.000 description 2
- IOJUPLGTWVMSFF-UHFFFAOYSA-N benzothiazole Chemical compound C1=CC=C2SC=NC2=C1 IOJUPLGTWVMSFF-UHFFFAOYSA-N 0.000 description 2
- 239000004359 castor oil Substances 0.000 description 2
- 235000019438 castor oil Nutrition 0.000 description 2
- 150000004659 dithiocarbamates Chemical class 0.000 description 2
- 150000004665 fatty acids Chemical class 0.000 description 2
- 229920001973 fluoroelastomer Polymers 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- ZEMPKEQAKRGZGQ-XOQCFJPHSA-N glycerol triricinoleate Natural products CCCCCC[C@@H](O)CC=CCCCCCCCC(=O)OC[C@@H](COC(=O)CCCCCCCC=CC[C@@H](O)CCCCCC)OC(=O)CCCCCCCC=CC[C@H](O)CCCCCC ZEMPKEQAKRGZGQ-XOQCFJPHSA-N 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000006078 metal deactivator Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- BDHFUVZGWQCTTF-UHFFFAOYSA-N sulfonic acid Chemical compound OS(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-N 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- JNYAEWCLZODPBN-JGWLITMVSA-N (2r,3r,4s)-2-[(1r)-1,2-dihydroxyethyl]oxolane-3,4-diol Chemical class OC[C@@H](O)[C@H]1OC[C@H](O)[C@H]1O JNYAEWCLZODPBN-JGWLITMVSA-N 0.000 description 1
- HYZJCKYKOHLVJF-UHFFFAOYSA-N 1H-benzimidazole Chemical compound C1=CC=C2NC=NC2=C1 HYZJCKYKOHLVJF-UHFFFAOYSA-N 0.000 description 1
- RURPJGZXBHYNEM-UHFFFAOYSA-N 2-[2-[(2-hydroxyphenyl)methylideneamino]propyliminomethyl]phenol Chemical compound C=1C=CC=C(O)C=1C=NC(C)CN=CC1=CC=CC=C1O RURPJGZXBHYNEM-UHFFFAOYSA-N 0.000 description 1
- 229910052582 BN Inorganic materials 0.000 description 1
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- QAPVYZRWKDXNDK-UHFFFAOYSA-N P,P-Dioctyldiphenylamine Chemical compound C1=CC(CCCCCCCC)=CC=C1NC1=CC=C(CCCCCCCC)C=C1 QAPVYZRWKDXNDK-UHFFFAOYSA-N 0.000 description 1
- 238000005273 aeration Methods 0.000 description 1
- 150000001336 alkenes Chemical class 0.000 description 1
- QRUDEWIWKLJBPS-UHFFFAOYSA-N benzotriazole Chemical compound C1=CC=C2N[N][N]C2=C1 QRUDEWIWKLJBPS-UHFFFAOYSA-N 0.000 description 1
- 239000012964 benzotriazole Substances 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- KIZFHUJKFSNWKO-UHFFFAOYSA-M calcium monohydroxide Chemical compound [Ca]O KIZFHUJKFSNWKO-UHFFFAOYSA-M 0.000 description 1
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 1
- 150000001733 carboxylic acid esters Chemical class 0.000 description 1
- 239000003599 detergent Substances 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 239000003925 fat Substances 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- LPRVNTWNHMSTPR-UHFFFAOYSA-M lithium;2-hydroxyoctadecanoate Chemical compound [Li+].CCCCCCCCCCCCCCCCC(O)C([O-])=O LPRVNTWNHMSTPR-UHFFFAOYSA-M 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- ZQKXQUJXLSSJCH-UHFFFAOYSA-N melamine cyanurate Chemical compound NC1=NC(N)=NC(N)=N1.O=C1NC(=O)NC(=O)N1 ZQKXQUJXLSSJCH-UHFFFAOYSA-N 0.000 description 1
- QLOAVXSYZAJECW-UHFFFAOYSA-N methane;molecular fluorine Chemical compound C.FF QLOAVXSYZAJECW-UHFFFAOYSA-N 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 150000002751 molybdenum Chemical class 0.000 description 1
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 150000002990 phenothiazines Chemical class 0.000 description 1
- 150000003014 phosphoric acid esters Chemical class 0.000 description 1
- DOIRQSBPFJWKBE-UHFFFAOYSA-N phthalic acid di-n-butyl ester Natural products CCCCOC(=O)C1=CC=CC=C1C(=O)OCCCC DOIRQSBPFJWKBE-UHFFFAOYSA-N 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 150000003900 succinic acid esters Chemical class 0.000 description 1
- VLLMWSRANPNYQX-UHFFFAOYSA-N thiadiazole Chemical compound C1=CSN=N1.C1=CSN=N1 VLLMWSRANPNYQX-UHFFFAOYSA-N 0.000 description 1
- XZZNDPSIHUTMOC-UHFFFAOYSA-N triphenyl phosphate Chemical class C=1C=CC=CC=1OP(OC=1C=CC=CC=1)(=O)OC1=CC=CC=C1 XZZNDPSIHUTMOC-UHFFFAOYSA-N 0.000 description 1
- ITRNXVSDJBHYNJ-UHFFFAOYSA-N tungsten disulfide Chemical compound S=[W]=S ITRNXVSDJBHYNJ-UHFFFAOYSA-N 0.000 description 1
Classifications
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- 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
- 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
-
- 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
- C10M169/04—Mixtures of base-materials and additives
-
- 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
- C10M169/04—Mixtures of base-materials and additives
- C10M169/041—Mixtures of base-materials and additives the additives being macromolecular compounds only
-
- 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
- C10M2207/10—Carboxylix acids; Neutral salts thereof
- C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
- C10M2207/125—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
- C10M2207/126—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids monocarboxylic
- C10M2207/1265—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids monocarboxylic used as thickening agent
-
- 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
- C10M2207/10—Carboxylix acids; Neutral salts thereof
- C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
- C10M2207/125—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
- C10M2207/128—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids containing hydroxy groups; Ethers thereof
- C10M2207/1285—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids containing hydroxy groups; Ethers thereof used as thickening agents
-
- 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
- C10M2217/00—Organic macromolecular compounds containing nitrogen as ingredients in lubricant compositions
- C10M2217/04—Macromolecular compounds from nitrogen-containing monomers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C10M2217/045—Polyureas; Polyurethanes
- C10M2217/0456—Polyureas; Polyurethanes used as thickening agents
-
- 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
- C10N2010/00—Metal present as such or in compounds
- C10N2010/04—Groups 2 or 12
-
- 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
- C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
- C10N2020/01—Physico-chemical properties
- C10N2020/02—Viscosity; 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
- 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
- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/06—Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
-
- 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
- C10N2030/36—Seal compatibility, e.g. with rubber
-
- 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
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- 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
Definitions
- This invention relates to a grease composition and to use of the grease composition in a sealed bearing.
- Sealed bearings are used in many different types of machinery.
- the seals prevent the ingress of dirt and water that could damage the bearing and impair the functioning of the machinery.
- Typical seal materials include acrylonitrile-butadiene rubber (NBR) and fluoroelastomers (FKM).
- NBR acrylonitrile-butadiene rubber
- FKM fluoroelastomers
- a grease is provided at the seal contact in order to prolong the life of the seal.
- There can be significant friction at the seal-metal interface which can lead to heat generation and a loss of efficiency.
- the present inventors have sought to provide grease compositions that can act to reduce the friction at the seal-metal interface and thereby improve the efficiency of sealed bearings.
- US2009/0088353 discloses a grease composition for sealed bearings comprising a Fischer-Tropsch derived base oil and a lithium hydroxystearate thickener.
- the present inventors have surprisingly found that the combination of a low viscosity polyalphaolefin base oil with a calcium thickener can provide a grease generating particularly low friction at a seal-metal interface.
- the present invention provides a grease composition comprising from 40 to 90wt% of a first base oil component which is a polyalphaolefin and having a kinematic viscosity at 100°C of between 1 and 5mm 2 /s, wherein the weight percentage is based upon the weight of the grease composition, and comprising 2 to 18 wt % based upon the weight of the grease composition of a thickener which is a C 13 -C 21 fatty acid salt of calcium.
- the present invention provides the use of a grease composition at a seal-metal interface in a sealed bearing
- the grease composition comprises a base oil and a thickener
- the base oil comprises from 40 to 90wt% of a first base oil which is a polyalphaolefin and has a kinematic viscosity at 100°C of between 1 and 5mm 2 /s, wherein the weight percentage is based upon the weight of the grease composition, and comprises 2 to 18 wt% based upon the weight of the grease composition of a thickener which is a C 13 -C 21 fatty acid salt of calcium.
- the grease composition comprises from 40 to 90wt% of a first base oil component which is a polyalphaolefin and has a kinematic viscosity at 100°C of between 1 and 5mm 2 /s.
- the grease composition may comprise further base oils, but preferably the first base oil component makes up at least 50wt%, and preferably at least 80wt% of the total base oil (based upon the total weight of base oil in the grease composition).
- the thickener in the grease composition is a C 13 -C 21 fatty acid salt of calcium, and preferably is a hydrogenated castor oil fatty acid salt of calcium.
- the amount of thickener is from 2 to 18wt%, based upon the weight of the grease composition, more preferably from 2 to 14wt%.
- the grease composition of this invention may also comprise anti-oxidants, rust preventatives, oiliness agents, extreme pressure additives, anti-wear agents, solid lubricants, metal deactivators, polymers, detergents and other additives.
- the anti-oxidants include, for example, 2,6-di-t-butyl-4-methylphenol, 2,6-di-t-butyl-paracresol, P,P'-dioctyldiphenylamine, N-phenyl- ⁇ -naphthylamine and phenothiazines.
- the rust preventatives include paraffin oxide, carboxylic acid metal salts, sulphonic acid metal salts, carboxylic acid esters, sulphonic acid esters, succinic acid esters, sorbitan esters and various amine salts.
- the oiliness agents, extreme pressure additives and anti-wear agents include, for example, sulphurised zinc dialkyl dithiophosphates, sulphurised zinc diaryl dithiophosphates, sulphurised zinc dialkyl dithiocarbamates, sulphurised zinc diaryl dithiocarbamates, sulphurised molybdenum dialkyl dithiophosphates, sulphurised molybdenum diaryl dithiophosphates, sulphurised molybdenum dialkyl dithiocarbamates, sulphurised molybdenum diaryl dithiocarbamates, organic molybdenum complexes, sulphurised olefins, triphenylphosphates, triphenylphosphorothionates, tricresylphosphates, other phosphate esters and sulphurised fats and oils.
- the solid lubricants include, for example, molybdenum disulphide, graphite, boron nitride, melamine cyanurate, PTFE (polytetrafluoroethylene), tungsten disulphide, mica, graphite fluoride and so on.
- the metal deactivators include, for example, N,N'-disalicylidene-1,2-diaminopropane, benzotriazole, benzoimidazole, benzothiazole and thiadiazole.
- the grease compositions may be manufactured using standard grease manufacturing routes.
- the grease compositions of the invention are suitably used at a seal-metal interface in a sealed bearing.
- the seal is suitably made from a material such as acrylonitrile-butadiene rubber (NBR), hydrotreated acrylonitrile-butadiene rubber (HNBR) or a fluoroelastomer (FKM).
- NBR acrylonitrile-butadiene rubber
- HNBR hydrotreated acrylonitrile-butadiene rubber
- FKM fluoroelastomer
- the bearing will contain a lubricant and the grease composition of the invention should be applied such that the grease composition is not contaminated by the lubricant.
- Greases were prepared by adding base oil and fatty acid to a kettle, heating to 85-90°C (at 3°C/min) and stirring at 100rpm. Calcium hydroxide was added as a powder and then water was added. The kettle was closed and heated to 135°C (at 2°C/min). The contents were stirred at 100rpm and the wall temperature limit of the kettle was set at 140°C. The kettle was vented approximately 40 minutes after reaching 135°C. Additional base oil was heated to 80°C and then added via a pump to the kettle. The contents were stirred at 150rpm for 5 minutes and the product temperature was kept between 130 and 135°C. A nitrogen tube was connected the kettle, and the contents were exposed to nitrogen flow for 15 minutes, thereby dehydrating the sample.
- the contents were cooled to 100°C (at 2°C/min) with stirring at 100rpm.
- Additives were added, using additional base oil for dilution, at 80°C or lower. After addition of an additive, the contents were stirred for 1 minute at 100rpm.
- the contents were then cooled to 50-60°C (controlled by wall temperature setting: 20°C at 5°C/min and stirring at 100rpm). De-aeration was begun at 70°C, using a vacuum of -150mbar for 10 minutes and stirring at 50rpm.
- the product was homogenised at 1 x 300bar.
- the PAO 2.0 was a polyalphaolefin and had a viscosity at 100°C of 2.0cSt.
- the XHVI 3.0 and XHVI 4.0 were base oils made by a Fischer-Tropsch process and were obtained from Shell.
- the XHVI 3.0 had a viscosity at 100°C of 3.0cSt and the XHVI 4.0 had a viscosity at 100°C of 4.0cSt.
- HCOFA is hydrogenated castor oil fatty acid.
- the additive package was the same in each of the example and comparative examples.
- the grease composition of the invention shows considerably lower friction than the grease compositions of the comparative examples (wherein the base oils have similar viscosities but are made by Fischer-Tropsch processes).
Description
- This invention relates to a grease composition and to use of the grease composition in a sealed bearing.
- Sealed bearings are used in many different types of machinery. The seals prevent the ingress of dirt and water that could damage the bearing and impair the functioning of the machinery. Typical seal materials include acrylonitrile-butadiene rubber (NBR) and fluoroelastomers (FKM). A grease is provided at the seal contact in order to prolong the life of the seal. There can be significant friction at the seal-metal interface which can lead to heat generation and a loss of efficiency. The present inventors have sought to provide grease compositions that can act to reduce the friction at the seal-metal interface and thereby improve the efficiency of sealed bearings.
US2009/0088353 discloses a grease composition for sealed bearings comprising a Fischer-Tropsch derived base oil and a lithium hydroxystearate thickener. - The present inventors have surprisingly found that the combination of a low viscosity polyalphaolefin base oil with a calcium thickener can provide a grease generating particularly low friction at a seal-metal interface. Accordingly the present invention provides a grease composition comprising from 40 to 90wt% of a first base oil component which is a polyalphaolefin and having a kinematic viscosity at 100°C of between 1 and 5mm2/s, wherein the weight percentage is based upon the weight of the grease composition, and comprising 2 to 18 wt % based upon the weight of the grease composition of a thickener which is a C13-C21 fatty acid salt of calcium.
- In a further aspect the present invention provides the use of a grease composition at a seal-metal interface in a sealed bearing wherein the grease composition comprises a base oil and a thickener, wherein the base oil comprises from 40 to 90wt% of a first base oil which is a polyalphaolefin and has a kinematic viscosity at 100°C of between 1 and 5mm2/s, wherein the weight percentage is based upon the weight of the grease composition, and comprises 2 to 18 wt% based upon the weight of the grease composition of a thickener which is a C13-C21 fatty acid salt of calcium.
- The grease composition comprises from 40 to 90wt% of a first base oil component which is a polyalphaolefin and has a kinematic viscosity at 100°C of between 1 and 5mm2/s. The grease composition may comprise further base oils, but preferably the first base oil component makes up at least 50wt%, and preferably at least 80wt% of the total base oil (based upon the total weight of base oil in the grease composition).
- The thickener in the grease composition is a C13-C21 fatty acid salt of calcium, and preferably is a hydrogenated castor oil fatty acid salt of calcium. The amount of thickener is from 2 to 18wt%, based upon the weight of the grease composition, more preferably from 2 to 14wt%.
- The grease composition of this invention may also comprise anti-oxidants, rust preventatives, oiliness agents, extreme pressure additives, anti-wear agents, solid lubricants, metal deactivators, polymers, detergents and other additives.
- The anti-oxidants include, for example, 2,6-di-t-butyl-4-methylphenol, 2,6-di-t-butyl-paracresol, P,P'-dioctyldiphenylamine, N-phenyl-α-naphthylamine and phenothiazines.
- The rust preventatives include paraffin oxide, carboxylic acid metal salts, sulphonic acid metal salts, carboxylic acid esters, sulphonic acid esters, succinic acid esters, sorbitan esters and various amine salts.
- The oiliness agents, extreme pressure additives and anti-wear agents include, for example, sulphurised zinc dialkyl dithiophosphates, sulphurised zinc diaryl dithiophosphates, sulphurised zinc dialkyl dithiocarbamates, sulphurised zinc diaryl dithiocarbamates, sulphurised molybdenum dialkyl dithiophosphates, sulphurised molybdenum diaryl dithiophosphates, sulphurised molybdenum dialkyl dithiocarbamates, sulphurised molybdenum diaryl dithiocarbamates, organic molybdenum complexes, sulphurised olefins, triphenylphosphates, triphenylphosphorothionates, tricresylphosphates, other phosphate esters and sulphurised fats and oils.
- The solid lubricants include, for example, molybdenum disulphide, graphite, boron nitride, melamine cyanurate, PTFE (polytetrafluoroethylene), tungsten disulphide, mica, graphite fluoride and so on.
- The metal deactivators include, for example, N,N'-disalicylidene-1,2-diaminopropane, benzotriazole, benzoimidazole, benzothiazole and thiadiazole.
- The grease compositions may be manufactured using standard grease manufacturing routes.
- The grease compositions of the invention are suitably used at a seal-metal interface in a sealed bearing. The seal is suitably made from a material such as acrylonitrile-butadiene rubber (NBR), hydrotreated acrylonitrile-butadiene rubber (HNBR) or a fluoroelastomer (FKM). The bearing will contain a lubricant and the grease composition of the invention should be applied such that the grease composition is not contaminated by the lubricant.
- The invention is further explained in detail below by means of examples and comparative examples, but the invention is in no way limited by these examples.
- Greases were prepared by adding base oil and fatty acid to a kettle, heating to 85-90°C (at 3°C/min) and stirring at 100rpm. Calcium hydroxide was added as a powder and then water was added. The kettle was closed and heated to 135°C (at 2°C/min). The contents were stirred at 100rpm and the wall temperature limit of the kettle was set at 140°C. The kettle was vented approximately 40 minutes after reaching 135°C. Additional base oil was heated to 80°C and then added via a pump to the kettle. The contents were stirred at 150rpm for 5 minutes and the product temperature was kept between 130 and 135°C. A nitrogen tube was connected the kettle, and the contents were exposed to nitrogen flow for 15 minutes, thereby dehydrating the sample. The contents were cooled to 100°C (at 2°C/min) with stirring at 100rpm. Additives were added, using additional base oil for dilution, at 80°C or lower. After addition of an additive, the contents were stirred for 1 minute at 100rpm. The contents were then cooled to 50-60°C (controlled by wall temperature setting: 20°C at 5°C/min and stirring at 100rpm). De-aeration was begun at 70°C, using a vacuum of -150mbar for 10 minutes and stirring at 50rpm. The product was homogenised at 1 x 300bar.
- All the formulations are summarised in Table 1 below, with the quantities given as wt% based upon the total weight of the formulation:
Table 1 Example 1 Comparative Example 1 Comparative Example 2 Base Oil PAO 2.0 78.46 - - XHVI 3.0 - 78.46 - XHVI 4.0 - - 78.46 Thickener CaOH 1.64 1.64 1.64 HCOFA 12.50 12.50 12.50 Additive Package 7.40 7.40 7.40 - The PAO 2.0 was a polyalphaolefin and had a viscosity at 100°C of 2.0cSt. The XHVI 3.0 and XHVI 4.0 were base oils made by a Fischer-Tropsch process and were obtained from Shell. The XHVI 3.0 had a viscosity at 100°C of 3.0cSt and the XHVI 4.0 had a viscosity at 100°C of 4.0cSt. HCOFA is hydrogenated castor oil fatty acid. The additive package was the same in each of the example and comparative examples.
- The greases were applied to NBR seals. A sealed bearing was run for 24 hours and then the friction was measured.
- The results are given in table 2:
Table 2 Friction level (Ncm) Example 1 1.88 Comparative Example 1 3.06 Comparative Example 2 3.12 - The grease composition of the invention (wherein the base oil is a polyalphaolefin) shows considerably lower friction than the grease compositions of the comparative examples (wherein the base oils have similar viscosities but are made by Fischer-Tropsch processes).
Claims (2)
- A grease composition comprising from 40 to 90wt% of a first base oil component which is a polyalphaolefin and having a kinematic viscosity at 100°C of between 1 and 5 mm2/s, wherein the weight percentage is based upon the weight of the grease composition, and comprising a thickener which is a C13-C21 fatty acid salt of calcium, wherein the amount of thickener is from 2 to 18wt%, based upon the weight of the grease composition,
- Use of a grease composition at a seal-metal interface in a sealed bearing wherein the grease composition comprises a base oil and a thickener, wherein the base oil comprises from 40 to 90wt% of a first base oil component which is a polyalphaolefin and has a kinematic viscosity at 100°C of between 1 and 5mm2/s, wherein the weight percentage is based upon the weight of the grease composition, and comprises a thickener which is a C13-C21 fatty acid salt of calcium, wherein the amount of thickener is from 2 to 18wt%, based upon the weight of the grease composition,
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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EP15154756 | 2015-02-11 | ||
PCT/EP2016/052733 WO2016128403A1 (en) | 2015-02-11 | 2016-02-09 | Grease composition |
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EP3256552B1 true EP3256552B1 (en) | 2019-07-31 |
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US (1) | US20180044605A1 (en) |
EP (1) | EP3256552B1 (en) |
JP (1) | JP6937241B2 (en) |
CN (1) | CN107250328B (en) |
BR (1) | BR112017017308B1 (en) |
RU (1) | RU2710550C2 (en) |
WO (1) | WO2016128403A1 (en) |
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CN108970482A (en) * | 2018-07-13 | 2018-12-11 | 桐乡凡达石油制品有限公司 | A kind of method of agitator and the preparation environmental protection cutting oil using the agitator |
CN108970484A (en) * | 2018-07-13 | 2018-12-11 | 桐乡凡达石油制品有限公司 | A method of reconciliation bucket and the preparation cold-heading oil using the reconciliation bucket |
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US2151641A (en) * | 1936-12-21 | 1939-03-21 | Emery Industries Inc | Grease base and method of making |
US2822331A (en) * | 1954-02-03 | 1958-02-04 | Texas Co | Anhydrous calcium 12-hydroxy stearate grease |
US2862884A (en) * | 1954-03-23 | 1958-12-02 | Texas Co | Process for anhydrous calcium 12-hydroxy stearate and estolide containing grease |
US2877181A (en) * | 1956-05-02 | 1959-03-10 | Texas Co | Stabilized calcium fatty acid base grease |
US4879054A (en) * | 1988-02-29 | 1989-11-07 | Amoco Corporation | Process for producing low temperature high performance grease |
US6239085B1 (en) * | 1998-10-23 | 2001-05-29 | Exxon Research And Engineering Company | Grease composition containing pao, alkylaromatic synthetic fluid and white oil for industrial bearings |
JP4075469B2 (en) * | 2001-07-23 | 2008-04-16 | 日本精工株式会社 | sticker |
JP2003171683A (en) * | 2001-12-07 | 2003-06-20 | Nsk Ltd | Biodegradable grease composition and rolling device |
US7576044B2 (en) * | 2003-11-14 | 2009-08-18 | Exxonmobil Research And Engineering Company | PAO oil selection to control lubricating grease evaporation and low temperature |
US7592497B2 (en) * | 2006-03-24 | 2009-09-22 | Exxonmobil Chemical Patents Inc. | Low viscosity polyalphapolefin based on 1-decene and 1-dodecene |
EP2027242B1 (en) * | 2006-05-31 | 2016-07-06 | Shell Internationale Research Maatschappij B.V. | Process for preparing a soap concentrate |
KR101267758B1 (en) * | 2006-10-07 | 2013-05-23 | 게케엔 드리펠린 인터나쇼날 게엠베하 | Grease composition for use in constant velocity joints comprising at least two different molybdenum compounds |
US20090088353A1 (en) * | 2007-09-27 | 2009-04-02 | Chevron U.S.A. Inc. | Lubricating grease composition and preparation |
US8455416B2 (en) * | 2007-11-29 | 2013-06-04 | Ineos Usa Llc | Low viscosity oligomer oil product, process and composition |
JP4730714B2 (en) * | 2008-08-28 | 2011-07-20 | 日産自動車株式会社 | Grease composition |
US9506005B2 (en) * | 2009-08-05 | 2016-11-29 | Aktoebolaget Skf | Grease composition and methods for manufacturing the grease composition |
DE102010006745A1 (en) * | 2010-02-02 | 2011-08-04 | Fuchs Petrolub AG, 68169 | Greases containing lignosulfonate, their preparation and use |
EP2591080B1 (en) * | 2010-07-05 | 2014-11-26 | Shell Internationale Research Maatschappij B.V. | Process for the manufacture of a grease composition |
CN102876434B (en) * | 2012-10-17 | 2014-07-16 | 中国石油化工股份有限公司 | Lubricating grease composition for automobile glass lifter and preparation method of lubricating grease composition |
RU2529461C1 (en) * | 2013-08-30 | 2014-09-27 | Общество с ограниченной ответственностью "Инженерная смазочная компания "МИСКОМ" | Grease lubricant for heavily loaded rolling friction units |
CN103555397A (en) * | 2013-10-23 | 2014-02-05 | 中国石油化工股份有限公司 | Anhydrous calcium-based lubricating grease composition and preparation method thereof |
JP5764242B2 (en) * | 2014-07-01 | 2015-08-19 | 出光興産株式会社 | Grease composition and lubrication method |
-
2016
- 2016-02-09 BR BR112017017308-5A patent/BR112017017308B1/en not_active IP Right Cessation
- 2016-02-09 CN CN201680009344.6A patent/CN107250328B/en not_active Expired - Fee Related
- 2016-02-09 RU RU2017129694A patent/RU2710550C2/en active
- 2016-02-09 WO PCT/EP2016/052733 patent/WO2016128403A1/en active Application Filing
- 2016-02-09 US US15/549,705 patent/US20180044605A1/en not_active Abandoned
- 2016-02-09 EP EP16703553.4A patent/EP3256552B1/en active Active
- 2016-02-09 JP JP2017541618A patent/JP6937241B2/en active Active
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US20180044605A1 (en) | 2018-02-15 |
JP2018505281A (en) | 2018-02-22 |
BR112017017308A2 (en) | 2018-04-03 |
CN107250328B (en) | 2021-05-07 |
CN107250328A (en) | 2017-10-13 |
JP6937241B2 (en) | 2021-09-22 |
RU2017129694A (en) | 2019-03-12 |
BR112017017308B1 (en) | 2022-06-28 |
EP3256552A1 (en) | 2017-12-20 |
RU2710550C2 (en) | 2019-12-27 |
WO2016128403A1 (en) | 2016-08-18 |
RU2017129694A3 (en) | 2019-07-24 |
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