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US20180044605A1 - Grease composition - Google Patents

Grease composition Download PDF

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Publication number
US20180044605A1
US20180044605A1 US15/549,705 US201615549705A US2018044605A1 US 20180044605 A1 US20180044605 A1 US 20180044605A1 US 201615549705 A US201615549705 A US 201615549705A US 2018044605 A1 US2018044605 A1 US 2018044605A1
Authority
US
United States
Prior art keywords
grease composition
thickener
weight
base oil
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.)
Abandoned
Application number
US15/549,705
Inventor
Stefan Daegling
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shell USA Inc
Original Assignee
Shell Oil Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Shell Oil Co filed Critical Shell Oil Co
Assigned to SHELL OIL COMPANY reassignment SHELL OIL COMPANY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: DAEGLING, STEFAN
Publication of US20180044605A1 publication Critical patent/US20180044605A1/en
Abandoned legal-status Critical Current

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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
    • 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
    • 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—Form in which the lubricant is applied to the material being lubricated semi-solid; greasy
    • C10N2210/02—
    • C10N2220/022—
    • C10N2230/02—
    • C10N2230/06—
    • C10N2230/36—
    • C10N2240/02—
    • C10N2250/10—

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.
  • 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 90 wt % 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 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 wherein the grease composition comprises a base oil and a thickener, wherein the base oil comprises from 40 to 90 wt % of a first base oil which is a polyalphaolefin and has a kinematic viscosity at 100° C. of between 1 and 5 mm 2 /s, wherein the weight percentage is based upon the weight of the grease composition, and comprises a thickener which is a C 13 -C 21 fatty acid salt of calcium.
  • the grease composition comprises from 40 to 90 wt % of a first base oil component which is a polyalphaolefin and has a kinematic viscosity at 100° C. of between 1 and 5 mm 2 /s.
  • the grease composition may comprise further base oils, but preferably the first base oil component makes up at least 50 wt %, and preferably at least 80 wt % 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 preferably from 2 to 18 wt %, based upon the weight of the grease composition, more preferably from 2 to 14 wt %.
  • 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 100 rpm. 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 100 rpm 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 150 rpm 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 100 rpm.
  • 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 100 rpm). De-aeration was begun at 70° C., using a vacuum of ⁇ 150 mbar for 10 minutes and stirring at 50 rpm.
  • the product was homogenised at 1 ⁇ 300bar.
  • the PAO 2.0 was a polyalphaolefin and had a viscosity at 100° C. of 2.0 cSt.
  • 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 3.0 cSt and the XHVI 4.0 had a viscosity at 100° C. of 4.0 cSt.
  • 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

Landscapes

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

Abstract

A grease composition comprising a polyalphaolefin and a thickener which is a fatty acid salt of calcium is disclosed. The composition is suitable for use at a seal-metal interface in a sealed bearing.

Description

    TECHNICAL FIELD OF THE INVENTION
  • This invention relates to a grease composition and to use of the grease composition in a sealed bearing.
    • BACKGROUND OF THE INVENTION
  • 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.
    • SUMMARY OF THE INVENTION
  • 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 90 wt % 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 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 90 wt % of a first base oil which is a polyalphaolefin and has 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 comprises a thickener which is a C13-C21 fatty acid salt of calcium.
    • DETAILED DESCRIPTION OF THE INVENTION
  • The grease composition comprises from 40 to 90 wt % of a first base oil component which is a polyalphaolefin and has a kinematic viscosity at 100° C. of between 1 and 5 mm2/s. The grease composition may comprise further base oils, but preferably the first base oil component makes up at least 50 wt %, and preferably at least 80 wt % 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 preferably from 2 to 18 wt %, based upon the weight of the grease composition, more preferably from 2 to 14 wt %.
  • 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.
    • EXAMPLES
  • 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 100 rpm. 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 100 rpm 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 150 rpm 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 100 rpm. 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 100 rpm). De-aeration was begun at 70° C., using a vacuum of −150 mbar for 10 minutes and stirring at 50 rpm. The product was homogenised at 1×300bar.
  • 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
    Comparative Comparative
    Example 1 Example 1 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 2.0 cSt. 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 3.0 cSt and the XHVI 4.0 had a viscosity at 100° C. of 4.0 cSt. 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 3.06
    Example 1
    Comparative 3.12
    Example 2
  • 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

Claims (6)

1. A grease composition comprising from 40 to 90 wt % 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.
2. A grease composition according to claim 1, wherein the amount of thickener is from 2 to 18 wt %, based upon the weight of the grease composition.
3. A method comprising:
applying a grease composition at a seal-metal interface in a sealed bearing, wherein the grease composition comprises from 40 to 90 wt % of a first base oil component which is a polyalphaolefin and has 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 comprises a thickener which is a C13-C21 fatty acid salt of calcium.
4. A method according to claim 3, wherein the amount of thickener is from 2 to 18 wt %, based upon the weight of the grease composition.
5. A grease composition according to claim 1, wherein the amount of thickener is from 2 to 14 wt %, based upon the weight of the grease composition.
6. A method according to claim 3 wherein the amount of thickener is from 2 to 14 wt %, based upon the weight of the grease composition.
US15/549,705 2015-02-11 2016-02-09 Grease composition Abandoned US20180044605A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP15154756.9 2015-02-11
EP15154756 2015-02-11
PCT/EP2016/052733 WO2016128403A1 (en) 2015-02-11 2016-02-09 Grease composition

Publications (1)

Publication Number Publication Date
US20180044605A1 true US20180044605A1 (en) 2018-02-15

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US (1) US20180044605A1 (en)
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EP3256552B1 (en) 2019-07-31
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EP3256552A1 (en) 2017-12-20
RU2017129694A3 (en) 2019-07-24

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