EP2649168A1 - Polymerverdickte schmierfettzusammensetzungen und ihre verwendung - Google Patents

Polymerverdickte schmierfettzusammensetzungen und ihre verwendung

Info

Publication number
EP2649168A1
EP2649168A1 EP10787033.9A EP10787033A EP2649168A1 EP 2649168 A1 EP2649168 A1 EP 2649168A1 EP 10787033 A EP10787033 A EP 10787033A EP 2649168 A1 EP2649168 A1 EP 2649168A1
Authority
EP
European Patent Office
Prior art keywords
grease composition
composition according
component
grease
molecular weight
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.)
Withdrawn
Application number
EP10787033.9A
Other languages
English (en)
French (fr)
Inventor
Dick Meijer
Dries Muller
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.)
SKF AB
Original Assignee
SKF AB
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 SKF AB filed Critical SKF AB
Publication of EP2649168A1 publication Critical patent/EP2649168A1/de
Withdrawn legal-status Critical Current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
    • C10M169/06—Mixtures of thickeners 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
    • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
    • C10M2201/085—Phosphorus oxides, acids or salts
    • 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
    • C10M2205/0213—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers 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
    • 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
    • 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
    • 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
    • C10M2207/16—Naphthenic acids
    • 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
    • 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
    • C10M2215/12—Partial amides of polycarboxylic acids
    • 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
    • C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
    • C10M2219/04—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions containing sulfur-to-oxygen bonds, i.e. sulfones, sulfoxides
    • 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
    • C10N2010/02—Groups 1 or 11
    • 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
    • C10N2010/00—Metal present as such or in compounds
    • C10N2010/08—Groups 4 or 14
    • 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
    • C10N2010/10—Groups 5 or 15
    • 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
    • C10N2010/14—Group 7
    • 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
    • C10N2010/16—Groups 8, 9, or 10
    • 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
    • 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—Semi-solids; greasy

Definitions

  • the present invention relates to a grease composition; a bearing, bearing component or bearing application system having a metallic surface onto which a layer of the grease composition has been applied; the use of the present grease composition for reconditioning the lubrication in mechanical components; the use of the present grease composition for protecting mechanical components against corrosion, wear or fretting, and a method for preparing the present grease composition.
  • a grease is described comprising a white mineral oil that has been thickened by means of a copolymer of ethylene and a homopolymer of polypropylene.
  • a lubricating grease composition has been described which is thickened with a polymeric mixture comprising a polyethylene and an atactic polypropylene.
  • EP 0700986 A2 a polymeric thickener for lubricating grease compositions is disclosed comprising containing a mixture of copolymers or homopolymers of polypropylene having a high molecular weight and a copolymer or homopolymer of propylene having a low molecular weight.
  • a lubricating grease composition is described comprising at least one polyolefin component, at least one base oil component and at least one rubber component.
  • Object of the present invention is to provide a new set of polymer thickened grease compositions for protecting mechanical components against corrosion, wear or fretting.
  • Another object is to provide new polymer thickened grease compositions for reconditioning the lubrication in mechanical components.
  • grease compositions can be prepared that form a highly attractive protection layer on mechanical components such as bearings by mixing a polymer thickened grease with an acid and a metal salt. Accordingly, the present invention relates to a grease composition comprising:
  • the present invention also relates to a mechanical component such as a bearing, bearing component or bearing application system having a metallic surface onto which a layer of the grease composition has been applied.
  • the present invention relates to the use of the present grease composition for reconditioning the lubrication in mechanical components, and to the use of the present grease composition for protecting mechanical components against corrosion, wear or fretting. Further, the present invention provides a method for preparing the present grease composition.
  • the present invention also provides a grease composition
  • a grease composition comprising: (a) a polymer thickened grease; (b) an acid having a pKa in the range of 2-7 wherein the pKa is measured in water at 25°C; and (c) a metal salt, wherein upon applying the grease composition to a metal surface of a mechanical component, the metal salt reacts with the acid and the acid or the acid so obtained etches the metal surface, thereby forming on the metal surface a layer comprising the metal of the metal salt.
  • the metals of the metal salt to be used in accordance with the present invention can be chosen from a wide variety of metals.
  • the metal of the metal salt is selected from the group consisting of Group 1A, IB, 2 A, 2B, 4A, 5 A, 7B and 8B elements of the Periodic Table.
  • the metal in the metal salt is selected from the group consisting of bismuth, zinc, sodium, calcium, magnesium, antimony, barium, manganese, silver, gold, copper and lead. More preferably, the metal in the metal salt is bismuth or zinc.
  • the metal salt is selected from the group consisting of naphtenates, octoate, carbamate, carboxamides, sulfonamides, stearates, hydroxystearates and any mixture thereof.
  • the metal salt is a stearate, a hydroxystearate or a mixture thereof.
  • use can be made of a variety of acids, provided that they have at least one pKa in the range of 2-7 wherein the pKa is measured in water at 25°C.
  • the acid to be used is a polyprotic acid.
  • the polyprotic acid to be used in accordance with the present invention has suitably two pKa values in the range of from 2-10, preferably two pKa values in the range of from 2-8, wherein the pKa is measured in water at 25°C. More preferably the polyprotic acid is a triprotic acid having three pKa values in the range of from 2-13 wherein the pKa is measured in water at 25°C. Most preferably the triprotic acid is phosphoric acid.
  • the polymer thickened grease to be used in accordance with the present invention comprises a lubricating base oil and a polymeric thickener.
  • a polymeric thickener preferably only use is made of a polymeric thickener, not a conventional soap- metal salt thickener.
  • a conventional thickener may be incorporated in the present grease composition as long as it does not adversely affect the overall properties of the grease composition.
  • the metal salt to be used in accordance with the present invention does not act as a thickener.
  • the metal salt to be used in accordance with the present invention is added to a grease composition that has already adequately been thickened by means of a polymer.
  • the metal salt serves a different purpose, namely to react with the acid to form on the metal surface a layer comprising the metal of the metal salt.
  • the present grease composition suitably comprises:
  • the weight percentage of the acid is based on a 85% concentration of the acid concerned.
  • the present grease composition comprises:
  • the grease composition preferably comprises in addition a polymeric ester in an amount in the range of from 0.1-40 wt%, based on the total weight of the grease composition.
  • Polymeric esters are copolymers of olefins and dicarboxylic acids which are esterified with various kinds of alcohols. Their viscosities suitably range from 5 mm 2 /s up to 700 mm 2 /s. Suitably, the average molecular wei *ghts (Mw) do not exceed 7,000 Dalton, ensuring that the polymeric esters are shear stable.
  • the polymeric ester is preferably high polar or low polar polymer ester
  • the polymeric thickener to be used in the polymer thickened grease suitably comprises at least one component selected from the group consisting of natural rubber, polypropylene, polyisoprene, polybutadiene, poly(styrene-butadiene), poly(ethylene-propylene-diene), polyurethane, polymethacrylate, polyisobutylene, poly(isobutylene-succinic acid), poly(isobutylene-succinic acid-polyacrylamide), polyurea and polyethylene.
  • the polymeric thickener preferably comprises a first component and a second component, with the first component having a higher weight average molecular weight than the second component.
  • the polymeric thickener comprises a high molecular weight component and a low molecular weight component, characterized in that the thickener comprises a mixture of (1) a (co- or homo-)polymer of propylene with a weight average molecular weight of more than 200.000 and (2) a (co- or homo-)polymer of propylene with a weight average molecular weight of less than 200.000.
  • the polymeric thickener to be used in accordance with the present invention contains a high molecular weight component comprising a (co- or homo-)polymer of propylene with a weight average molecular weight of more 200.000, preferably 200.000-350.000 and a low molecular weight component comprising a (co- or homo-) polymer of propylene with a weight average molecular weight of less than 100.000, preferably 50.000-100.000.
  • the weight ratio between the high molecular weight component and the low molecular weight component in the polymeric thickener can be 1 :40 - 3:1, suitably 1:40-1 :1, preferably 1 :40 - 1 :5, more preferably 1 :25 - 1 :15, and most preferably 1 :18-1 :20. Outside this preferred range for the weight ratio between the high and low molecular weight components the final lubricating grease composition will generally not have desired application properties, in particular mechanical stability and consistency, i.e. be too "rubbery/elastic" and/or too “buttery".
  • the low molecular weight component is preferably a polypropylene homopolymer, more preferably a polypropylene homopolymer with a melt flow rate of 500-1500 dg/min., especially 750-1250 dg/min. as determined by test ASTM D 1238 L.
  • the high molecular weight component preferably has a melt flow rate (ASTM D-1238) of 1.5-15, more preferably 1.5-7, especially 3-5.
  • the low molecular weight component is preferably a polypropylene homopolymer.
  • the high molecular weight component is a polypropylene homopolymer or a propylene/ethylene-copolymer.
  • the polymer thickener according to the invention is generally used in the lubricating grease composition in conventional amounts, i.e. from 1-20, preferably 5-15, especially about 10 percent by weight of the total grease composition. Other amounts can be used if desired.
  • the present grease composition may also contain other polymeric thickeners.
  • lubricating base oil any lubricating oil known per se may be used, such as mineral oils, synthetic hydrocarbons, ester oils, vegetable oils and mixtures thereof, of different viscosity.
  • the type of base oil and viscosity can be selected to suit specific applications.
  • the grease composition may additionally comprise at least one additive component which is selected from the group consisting of antioxidants, corrosion inhibitors, anti-wear agents and pressure tolerance-increasing additives, and wherein the total content of the additive component(s) is in the range between 0.2 and 15% by weight, and preferably between 1 and 8% by weight, based on the total weight of the grease composition.
  • the present grease composition additionally comprises an ester oil in an amount in the range of from 1 -40 wt%, based on total weight of the grease composition.
  • the present grease composition may additionally comprises an inert powder, preferably diamond powder, in an amount in the range of from 0.01-10 wt%, based on total weight of the grease composition.
  • the present invention also relates to a bearing, bearing component or bearing application system having a metallic surface onto which a layer of the grease composition in accordance with the present invention has been applied.
  • the present invention further provides a bearing, bearing component or bearing application system having a metallic surface onto which a layer has formed comprising the metal of the metal salt.
  • the bearing, bearing components or bearing application system may be pre-treated with the grease composition ensuring that it carries a protective layer against wear, fretting or corrosion before use, or such a protective metal layer will be formed on the bearing, bearing component or bearing application system during operation when the present grease composition is used for lubricating purposes.
  • the present invention also relates to the use of the grease composition according to the present invention for reconditioning the lubrication of a mechanical component having a metal surface.
  • the present invention relates to the use of the grease composition according to the present invention for reconditioning the lubrication of a bearing, bearing component or bearing application system.
  • the metal of the metal salt is preferably bismuth.
  • the present grease composition will be used for this purpose in emergency and accidental circumstances before operation of the device in question is interrupted. In that case the grease composition can suitably be injected by means of a device involving pyrotechnic means. Such devices are as such known.
  • the present invention further relates to the use of the grease composition according to the present for protecting a mechanical component having a metal surface against corrosion.
  • the present invention relates to the use of the grease composition according to the present for protecting a bearing, bearing component or bearing application system.
  • the present invention in addition relates to the use of the grease composition according to the present invention for protecting a mechanical component having a metal surface against wear.
  • the present invention relates to the use of the grease composition according to the present for protecting a bearing, bearing component or bearing application system against wear.
  • the present invention relates to the use of the grease composition according to the present invention for protecting a mechanical component having a metal surface against fretting.
  • the present invention relates to the use of the grease composition according to the present invention for protecting a bearing, bearing component or bearing application system against fretting.
  • the metal of the metal salt is preferably bismuth.
  • the metal of the metal salt is preferably bismuth and/or zinc.
  • the metal of the metal salt is preferably zinc, whereas the acid applied is preferably an acid having a pKa in the range of 2-7, preferably three pKa values in the range of from 2-13.
  • the acid then used is phosphoric acid.
  • a grease composition can suitably be applied in corrosion sensitive applications, transport and storage.
  • the present invention relates to a method for preparing a grease composition according to the present invention comprising the following steps:
  • step (b) adding to the mixture obtained in step (a) the acid.
  • step (a) the metal salt is heated above its melting point.
  • one or more anti-wear additives, anti-fretting additives, anti- corrosion additives, anti-oxidants, inert powder(s) and/or other additives are additionally mixed with the other components.
  • a final mixing is carried out in step (a) using a three-roll mill or a ball-mill.
  • the polymeric thickener composition according to the invention can be prepared by mixing the polymers in a manner known per se, which can optionally involve heating and/or the use of suitable solvents.
  • the polymers of the subject invention are mixed with a lubricating base oil and optional additives by means of conventional techniques known per se resulting in the grease composition according to the invention.
  • the preparation of the grease composition is preferably be carried out under a protective atmosphere, such as a nitrogen gasflow, for avoiding oxidation of the oils during heating.
  • a protective atmosphere such as a nitrogen gasflow
  • the solid polymeric components and the lubricating base oil are heated together (preferably under stirring) to a temperature above the melting point of polypropylene, preferably 190-210 °C, although other temperatures may be used if required.
  • the grease is cooled from the mixing temperature to room temperature. According to an especially preferred embodiment of the invention this cooling is carried out in a period of time between 1 sec. -3 min., preferably 10 sec.-l min., more preferably about 25-35 sec.
  • quenching This rapid cooling process, which forms an important aspect of the invention, will be indicated hereinbelow as "quenching".
  • the quenching of the lubricant grease composition can be carried out, for instance, by pouring the grease composition on a metal plate, although any other suitable rapid cooling method may also be used, such as spraying.
  • the quenching process according to the invention has a major influence on the grease structure, giving significant improvement of the properties of the final grease compositions compared to both conventional lubricating greases, as well as lubricating greases according to the invention which are cooled slowly, e.g. in approximately 1 degree per minute by the use of conventional cooling methods, such as simply keeping the grease in the reaction vessel with external/internal cooling. This results, for the polymer grease, in a lubricant lacking any mechanical stability.
  • the polymeric thickener forms a sponge-like structure, which gives the grease its appearance and structure.
  • the lubricating base oil is kept within the pore-like spaces within the thickener structure, and bleeds out during service of the grease.
  • the thickener-structure is very irregular with large pores as well as very small pores.
  • the oil bleeds out of the oil/thickener-structure onto the surfaces of the bearing, thereby providing the lubricating action.
  • the oil bleeding characteristics at the service temperature of the lubricant grease composition i.e. the running temperature of the bearing, as well as the "start up” temperature
  • the mechanical stability of the grease is dependent on the polymer thickener used, the lubricating base oil used, as well as the additives used.
  • the mechanical properties of the grease can be influenced by "working" the grease after the thickener is mixed with the lubricating base oil, as is well known to a man skilled in the art of lubricants.
  • the grease is "worked” to a consistency desired and/or required for its intended use.
  • the mechanical stability of the grease can be ascertained by means of tests known in the art, such as the Shell roll stability test.
  • the grease will have a penetration after the Shell roll stability test (24 hrs at 80 °C, 165 rpm), of max. 430.
  • the consistency of the grease can be classified by means of the NLGI-class.
  • the grease can usually be prepared to a NLGI-class range 00 to 4.
  • An NLGI-class of 0 or 00 can be made, resulting in a lubricant composition.
  • the viscosity of the separated oil must be acceptable, and preferably be constant.
  • the polymer-thickened grease composition according to the present invention can be used for all conventional applications for lubricant grease compositions, so long as these are compatible with the components of the lubricant grease composition.
  • the present grease composition can be used for lubricating bearings, couplings, toothed transmission gears, chutes or other instruments.
  • the mechanical component having a metal surface to be treated with the grease composition according to the present invention is preferably a bearing, bearing component or a bearing application system.
  • the bearing component may be inner rings, outer rings, cages, rollers, balls and seal-counter faces.
  • the bearing application system in accordance with the present invention comprises bearing housings, mounting axles, shafts, bearing joints and shields. Further uses of the lubricant grease compositions according to the present invention are e.g. agricultural machinery, bearings in dam-gates, low noise electric motors, large size electric motors, fans for cooling units, machine tool spindles, screw conveyor, and offshore and wind turbine applications.
  • the present invention further relates to a grease composition obtainable according to the method of the invention.
  • the grease composition in accordance with the present invention may have the form of a lubricant composition having an oily character or a paste, depending on the viscosity of the final grease composition.
  • the pre-coating was formed by degreasing the rings with a solvent; immersing the rings in the grease No. 3; heating the rings at 85°C for 2 hours; cooling and storing the rings for 16 hours at ambient temperature; and cleaning/washing the rings with a solvent. From Table 3 it is clear that the pre-treatment of the test bearing rings in accordance with the present invention (experiment No. 7) brings about much less friction oxidation weight loss when compared with the grease without the pre-treament with the layer building grease No. 3 (experiment No. 6). Table 3
  • the greases were tested in a laboratory aircraft simulation test set-up. The aim is to recondition the bearing for at least 60 minutes. The following conditions were applied:

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Lubricants (AREA)
EP10787033.9A 2010-12-06 2010-12-06 Polymerverdickte schmierfettzusammensetzungen und ihre verwendung Withdrawn EP2649168A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2010/007386 WO2012076025A1 (en) 2010-12-06 2010-12-06 Polymer thickened grease compositions and their use

Publications (1)

Publication Number Publication Date
EP2649168A1 true EP2649168A1 (de) 2013-10-16

Family

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WO2015172846A1 (en) 2014-05-16 2015-11-19 Ab Nanol Technologies Oy Additive composition for lubricants
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CN106089605A (zh) * 2016-08-25 2016-11-09 国网上海节能服务有限公司 一种基于金属抗磨修复剂的风机增效方法
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CN103347989A (zh) 2013-10-09
US20140011718A1 (en) 2014-01-09
WO2012076025A1 (en) 2012-06-14

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