EP0765374A1 - Grease composition - Google Patents
Grease compositionInfo
- Publication number
- EP0765374A1 EP0765374A1 EP95923825A EP95923825A EP0765374A1 EP 0765374 A1 EP0765374 A1 EP 0765374A1 EP 95923825 A EP95923825 A EP 95923825A EP 95923825 A EP95923825 A EP 95923825A EP 0765374 A1 EP0765374 A1 EP 0765374A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- grease
- acid
- lithium
- grease composition
- mixture
- 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.)
- Granted
Links
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
- C10M169/06—Mixtures of thickeners and additives
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- C—CHEMISTRY; METALLURGY
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- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M117/00—Lubricating compositions characterised by the thickener being a non-macromolecular carboxylic acid or salt thereof
- C10M117/02—Lubricating compositions characterised by the thickener being a non-macromolecular carboxylic acid or salt thereof having only one carboxyl group bound to an acyclic carbon atom, cycloaliphatic carbon atom or hydrogen
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- 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
- C10M117/00—Lubricating compositions characterised by the thickener being a non-macromolecular carboxylic acid or salt thereof
- C10M117/02—Lubricating compositions characterised by the thickener being a non-macromolecular carboxylic acid or salt thereof having only one carboxyl group bound to an acyclic carbon atom, cycloaliphatic carbon atom or hydrogen
- C10M117/04—Lubricating compositions characterised by the thickener being a non-macromolecular carboxylic acid or salt thereof having only one carboxyl group bound to an acyclic carbon atom, cycloaliphatic carbon atom or hydrogen containing hydroxy groups
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- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M117/00—Lubricating compositions characterised by the thickener being a non-macromolecular carboxylic acid or salt thereof
- C10M117/06—Lubricating compositions characterised by the thickener being a non-macromolecular carboxylic acid or salt thereof having more than one carboxyl group bound to an acyclic carbon atom or cycloaliphatic carbon atom
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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
- C10M117/00—Lubricating compositions characterised by the thickener being a non-macromolecular carboxylic acid or salt thereof
- C10M117/08—Lubricating compositions characterised by the thickener being a non-macromolecular carboxylic acid or salt thereof having only one carboxyl group bound to a carbon atom of a six-membered aromatic ring
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- C—CHEMISTRY; METALLURGY
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- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M119/00—Lubricating compositions characterised by the thickener being a macromolecular compound
- C10M119/30—Lubricating compositions characterised by the thickener being a macromolecular compound containing atoms of elements not provided for in groups C10M119/02 - C10M119/28
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- C10M129/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen
- C10M129/86—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen having a carbon chain of 30 or more atoms
- C10M129/92—Carboxylic acids
- C10M129/93—Carboxylic acids having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
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- C10M129/86—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen having a carbon chain of 30 or more atoms
- C10M129/95—Esters
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- C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
- C10M2201/087—Boron oxides, acids or salts
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- C10M2207/122—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of seven or less carbon atoms monocarboxylic
- C10M2207/1225—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of seven or less carbon atoms monocarboxylic used as thickening agent
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- C10M2207/123—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of seven or less carbon atoms polycarboxylic
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- C10M2207/124—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of seven or less carbon atoms containing hydroxy groups; Ethers thereof
- C10M2207/1245—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of seven or less carbon atoms containing hydroxy groups; Ethers thereof used as thickening agent
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- 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
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- 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
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- 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
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- C10M2207/141—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to carbon atoms of six-membered aromatic rings monocarboxylic
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- C10M2207/1415—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to carbon atoms of six-membered aromatic rings monocarboxylic used as thickening agent
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- C10N2010/00—Metal present as such or in compounds
- C10N2010/02—Groups 1 or 11
Definitions
- This invention relates to grease compositions having low noise properties and high dropping points.
- the bearings in modern automobiles and electric appliances are typically sealed bearings.
- Greases for sealed bearings must provide lubrication for the life of the bearing which places high demands on greases used in such service.
- Sealed bearing greases must meet numerous performance requirements including extending bearing life, high temperature performance, high dropping point, low oil separation, oxidation stability, fretting wear protection and low noise.
- lithium complex soap based greases have been used in sealed bearing applications. Such greases offer long service at high temperatures but suffer from generally higher noise than simple lithium soap based greases.
- This invention relates to a grease composition having improved noise properties and high dropping point which comprises:
- the greases according to the invention provide long bearing life and high dropping point while providing low bearing noise.
- the lubricating oil base can be any of the conventionally used mineral oils, synthetic hydrocarbon oils or synthetic ester oils, or mixtures thereof depending upon the particular grease being prepared. In general these lubricating oils will have a viscosity in the range of about 5 to about 400 cSt at 40°C, although typical applications will require an oil having a viscosity ranging from about 10 to about 200 cSt at 40°C.
- Mineral lubricating oil base stocks used in prepar ⁇ ing the greases can be any conventionally refined base stocks derived from paraffinic, naphthenic and mixed base crudes.
- Synthetic lubri ⁇ cating oils that can be used include esters of glycols such as a C13 oxo acid diester of tetraethylene glycol, or complex esters such as one formed from 1 mole of sebacic acid and 2 moles of tetraethylene glycol and 2 moles of 2-ethylhexanoic acid.
- synthetic oils that can be used include synthetic hydrocarbons such as polyalphaolefins; alkyl benzenes, e.g., alkylate bottoms from the alkylation of benzene with tetrapropylene, or the copolymers of ethylene and propylene; silicone oils, e.g., ethyl phenyl polysiloxanes, methyl polysiloxanes, etc.; polyglycol oils, e.g., those obtained by condensing butyl alcohol with propylene oxide; carbonate esters, e.g., the product of reacting Cg oxo alcohol with ethyl carbonate to form a half ester followed by reaction of the latter with tetraethylene glycol, etc.
- synthetic hydrocarbons such as polyalphaolefins
- alkyl benzenes e.g., alkylate bottoms from the alkylation of benzene with tetrapropylene, or the
- Suitable synthetic oils include the polyphenyl ethers, e.g., those having from about 3 to 7 ether linkages and about 4 to 8 phenyl groups.
- the amount of lubricating oil in the grease can also vary broadly, but, typically, will range from about 50 wt% to about 98 wt%, preferably from about 75 wt% to about 95 wt%, of the grease.
- the grease composition contains a thickener dispersed in the lubricating base oil to form a grease.
- Preferred thickeners are lithium soap complex thickeners containing a lithium soap of a C_2 to c 24 hydroxy fatty acid and a second lithium salt compound which is a lithium salt of a C2 to C_2 aliphatic or cycloaliphatic dicarboxylic acid, a lithium salt of a C3 to C14 hydroxy carboxylic acid which has the hydroxy group separated from the carboxyl group by six or less carbon atoms or a mixture thereof.
- the lithium salt of boric acid may be added as a third thickener component.
- Preferred hydroxy fatty acids include hydroxystearic, hydroxyricinoleic, hydroxybehenic and hydroxypalmitic. Especially preferred is 12-hydroxystearic acid.
- the second lithium salt compound is preferably a Cg to C ⁇ o aliphatic dicarboxylic acid, more preferably azelaic or sebacic acids, especial ⁇ ly azelaic acid.
- the hydroxy-carboxylic acid is preferably lactic acid, salicylic acid or other hydroxy-benzoic acids, more preferably salicylic acid.
- the amount of lithium soap complex thickeners is preferably from 5 to 20 wt%, based on grease.
- the ratio of hydroxy fatty acid to aliphatic dicarboxylic acid and/or hydroxy-carboxylic acid is from 10:0.5 to 10:15, preferably 10:1.5 to 10:6.
- the grease composition will also contain a polyalkenyl succinic anhydride, a polyalkenyl succinic acid or mixture thereof as dispersant.
- the polyalkenyl group will have a number average molecu ⁇ lar weight of from 300 to 4,000, preferably 400 to 2,500.
- Preferred polyalkenyl groups are poly-C and poly-C_j, olefins, especially poly- isobutylene.
- Polyisobutylene succinic anhydride and/or acid will hereinafter be collectively referred to as PIBSA.
- the amount of dispersant is preferably from 0.1 wt% to 5 wt%, based on grease.
- Lithium complex soap greases are prepared by heating hydroxy fatty acid and base oil, adding a concentrated aqueous solution of lithium hydroxide. Heating is continued at elevated temperature to remove most of the water. The reaction mixture is then cooled to about 100°C and dicarboxylic acid is added followed by a second portion of concentrated lithium hydroxide. This mixture is again heated to elevated temperature to again remove water. After heating is completed, the grease mixture is cooled, remaining oil and any other additives added and the grease is worked up using conventional techniques. The preparation may also be accomplished in a single step process by heating, base oil, fatty acid and dicarboxylic acid, then adding lithium hydroxide solution followed by dehydration and adding remaining oil.
- the grease composition may contain small amounts of supple ⁇ mental additives which include, but are not limited to, anti-corrosive agents, extreme pressure antiwear agents, pour point depressants, tackiness agents, oxidation inhibitors, dyes and the like, which are incorporated for specific purposes.
- the total amount of these addi ⁇ tives will typically range from about 2 wt% to about 10 wt% based on total weight of the grease composition.
- This example illustrates the preparation of a low noise grease.
- a laboratory kettle was charged with 700 g of refined paraf- finic base oil having a viscosity of 90 cSt at 40°C, 139.2 g of 12-hydroxystearic acid, 69.5 g of azelaic and 12.0 g of PIBSA having a polyisobutenyl radical of number average molecular weight of 950.
- the resulting mixture was heated with stirring until the temperature reached 90°C. At this point, heating was stopped and 345 g of a 15% solution of lithium hydroxide (heated to 90°C) was added with stir ⁇ ring. When addition of the lithium hydroxide solution was complete, heating was resumed to remove water.
- Grease noise was measured according to the following proce ⁇ dure which is more fully described in Japanese Patent 53-2357.
- Solid particles in grease result in vibrations which can be converted into an electrical signal.
- the electrical signal due to solid parti ⁇ cles including soap particles in grease can be measured according to the following procedure.
- a vibration detection device is attached to the outer ring of the bearings. The detection device converts the vibrations into an electrical signal which is amplified and sent to a zone wave filter.
- the zone wave filter compares the amplified signal received from the bearings with the known vibration frequency from the bearings alone, filters out the vibration frequencies from the bear ⁇ ings and sends the filtered electronic signal through an amplifier to a clipper circuit.
- the clipper circuit "clips" the electrical signal from the amplifier at a given level. This level is set so as to measure only peak voltages which correspond to solid particle noise from particles in the grease. The clipping level is set at a value greater than the peak value corresponding to the race noise from the bearings.
- Dispersant A (1) 1.0 1.5 2.0
- Dispersant C (3) 1.0 1.5 2.0
- Dispersant D 1.5 2.0 2.5 3.0
- average molecular weight of PIB is 950
- average molecular weight of PIB is 950
- average molecular weight of PIB is 950
- Greases formulated with a polyisobutenyl succinic anhydride/ acid type dispersant showed significantly better noise property and higher dropping point compared to a lithium complex grease formulated without dispersant (Sample 4). Samples 1-3 also demonstrated consistently higher dropping points compared to greases formulated with polyisobutenyl succinic imide type dispersants (Com ⁇ parative Samples 5-13). A commercial lithium complex grease (Sample 14) demonstrated a much inferior noise property compared to Samples 1-3 according to this invention.
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US26149194A | 1994-06-17 | 1994-06-17 | |
US261491 | 1994-06-17 | ||
PCT/US1995/007471 WO1995035355A1 (en) | 1994-06-17 | 1995-06-12 | Grease composition |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0765374A1 true EP0765374A1 (en) | 1997-04-02 |
EP0765374B1 EP0765374B1 (en) | 2001-12-05 |
Family
ID=22993536
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95923825A Expired - Lifetime EP0765374B1 (en) | 1994-06-17 | 1995-06-12 | Grease composition |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0765374B1 (en) |
JP (1) | JP3762432B2 (en) |
CA (1) | CA2191481C (en) |
DE (1) | DE69524412T2 (en) |
WO (1) | WO1995035355A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7651986B2 (en) | 2005-10-25 | 2010-01-26 | Chevron U.S.A. Inc. | Finished lubricant with improved rust inhibition |
CN109517644A (en) * | 2018-11-13 | 2019-03-26 | 贵州丰达轴承有限公司 | A kind of noise reduction lubricant |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB9803367D0 (en) | 1998-02-17 | 1998-04-15 | Exxon Research Engineering Co | Lubricating grease composition and preparation |
US6100226A (en) * | 1998-05-20 | 2000-08-08 | The Lubrizol Corporation | Simple metal grease compositions |
US6063742A (en) * | 1999-03-01 | 2000-05-16 | The Lubrizol Corporation | Grease compositions |
JP2001335792A (en) * | 2000-03-21 | 2001-12-04 | Nsk Ltd | Lubricating grease composition, and roller bearing and rolling device using this composition |
US6482779B2 (en) | 2000-03-21 | 2002-11-19 | Nsk Ltd. | Lubricating grease composition and rolling apparatus comprising same |
DE10254795A1 (en) * | 2002-11-22 | 2004-06-09 | Fuchs Europe Schmierstoffe Gmbh | Composition for use as lubricating grease, e.g. for roller bearings or friction bearings, comprises polyether base oil containing poly-tetrahydrofuran units, plus thickener and other additives |
WO2010012602A2 (en) * | 2008-08-01 | 2010-02-04 | Shell Internationale Research Maatschappij B.V. | Lubricating grease compositions |
CN114085694A (en) * | 2021-12-22 | 2022-02-25 | 新乡市恒星科技有限责任公司 | Special lubricating grease for corrugated roller bearing and preparation method thereof |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0084910B1 (en) * | 1982-01-21 | 1989-02-22 | Shell Internationale Researchmaatschappij B.V. | High dropping-point lithium-complex grease having improved anti-noise properties |
JPS63309591A (en) * | 1987-06-11 | 1988-12-16 | Nippon Denso Co Ltd | Grease composition |
AU638705B2 (en) * | 1989-04-20 | 1993-07-08 | Lubrizol Corporation, The | Methods for reducing friction between relatively slideable components using metal overbased colloidal disperse systems |
-
1995
- 1995-06-12 DE DE69524412T patent/DE69524412T2/en not_active Expired - Fee Related
- 1995-06-12 JP JP50240096A patent/JP3762432B2/en not_active Expired - Fee Related
- 1995-06-12 CA CA002191481A patent/CA2191481C/en not_active Expired - Fee Related
- 1995-06-12 WO PCT/US1995/007471 patent/WO1995035355A1/en active IP Right Grant
- 1995-06-12 EP EP95923825A patent/EP0765374B1/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
See references of WO9535355A1 * |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7651986B2 (en) | 2005-10-25 | 2010-01-26 | Chevron U.S.A. Inc. | Finished lubricant with improved rust inhibition |
US7683015B2 (en) | 2005-10-25 | 2010-03-23 | Chevron U.S.A. Inc. | Method of improving rust inhibition of a lubricating oil |
US7732386B2 (en) | 2005-10-25 | 2010-06-08 | Chevron U.S.A. Inc. | Rust inhibitor for highly paraffinic lubricating base oil |
US7906466B2 (en) | 2005-10-25 | 2011-03-15 | Chevron U.S.A. Inc. | Finished lubricant with improved rust inhibition |
US7910528B2 (en) | 2005-10-25 | 2011-03-22 | Chevron U.S.A. Inc. | Finished lubricant with improved rust inhibition made using fischer-tropsch base oil |
US7947634B2 (en) | 2005-10-25 | 2011-05-24 | Chevron U.S.A. Inc. | Process for making a lubricant having good rust inhibition |
CN109517644A (en) * | 2018-11-13 | 2019-03-26 | 贵州丰达轴承有限公司 | A kind of noise reduction lubricant |
Also Published As
Publication number | Publication date |
---|---|
CA2191481C (en) | 2005-06-07 |
EP0765374B1 (en) | 2001-12-05 |
WO1995035355A1 (en) | 1995-12-28 |
CA2191481A1 (en) | 1995-12-28 |
JPH10501844A (en) | 1998-02-17 |
JP3762432B2 (en) | 2006-04-05 |
DE69524412D1 (en) | 2002-01-17 |
DE69524412T2 (en) | 2002-05-02 |
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