WO2007093632A2 - Composition de lubrifiant - Google Patents

Composition de lubrifiant Download PDF

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Publication number
WO2007093632A2
WO2007093632A2 PCT/EP2007/051485 EP2007051485W WO2007093632A2 WO 2007093632 A2 WO2007093632 A2 WO 2007093632A2 EP 2007051485 W EP2007051485 W EP 2007051485W WO 2007093632 A2 WO2007093632 A2 WO 2007093632A2
Authority
WO
WIPO (PCT)
Prior art keywords
molybdenum
range
lubricant composition
component
sulphur
Prior art date
Application number
PCT/EP2007/051485
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English (en)
Other versions
WO2007093632A3 (fr
Inventor
Noriaki Shinoda
Original Assignee
Shell Internationale Research Maatschappij B.V.
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Publication date
Application filed by Shell Internationale Research Maatschappij B.V. filed Critical Shell Internationale Research Maatschappij B.V.
Publication of WO2007093632A2 publication Critical patent/WO2007093632A2/fr
Publication of WO2007093632A3 publication Critical patent/WO2007093632A3/fr

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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
    • C10M163/00—Lubricating compositions characterised by the additive being a mixture of a compound of unknown or incompletely defined constitution and a non-macromolecular compound, 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
    • C10M169/06—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
    • 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
    • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/10—Amides of carbonic or haloformic acids
    • C10M2215/102—Ureas; Semicarbazides; Allophanates
    • C10M2215/1026—Ureas; Semicarbazides; Allophanates used as thickening material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • 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
    • C10M2219/06—Thio-acids; Thiocyanates; Derivatives thereof
    • C10M2219/062—Thio-acids; Thiocyanates; Derivatives thereof having carbon-to-sulfur double bonds
    • C10M2219/066—Thiocarbamic type compounds
    • C10M2219/068—Thiocarbamate metal 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
    • C10M2223/00—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions
    • C10M2223/02—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions having no phosphorus-to-carbon bonds
    • C10M2223/04—Phosphate esters
    • C10M2223/045—Metal containing thio derivatives
    • 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
    • C10N2010/12—Groups 6 or 16
    • 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
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/04—Oil-bath; Gear-boxes; Automatic transmissions; Traction drives
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2050/00—Form in which the lubricant is applied to the material being lubricated
    • C10N2050/10—Semi-solids; greasy

Definitions

  • the present invention relates to a lubricant composition, in particular to a high-performance lubricant composition capable of exhibiting excellent friction reducing characteristics.
  • Lubricants are used in parts subject to sliding friction in various machines such as automotive vehicles, construction machines and machine tools. However, because of the trends towards more compact machinery and higher performance, lubricants having better friction properties are in demand. There is particular demand for lubricants having low friction resistance from the standpoint of reducing energy losses due to friction.
  • Organomolybdenum compounds such as molybdenum dithiocarbamates or molybdenum dithiophosphates have been widely used in the lubricant compositions of recent years in order to reduce friction, especially at lubrication points in the boundary lubrication regime, since they exhibit an excellent friction-reducing effect.
  • molybdenum has been designated as a "Class 1" specified chemical substance in accordance with the pollution release and transfer register (PRTR) reporting system set up in 1999 in Japan, it is desirable from the standpoint of environmental protection that the amount of molybdenum used should be as small as possible. Furthermore, since the price of molybdenum is relatively high and ' has been rising sharply in recent years, the development of high-performance lubricants in which the amount of molybdenum in the blend has been reduced is also required with a view to improving the economic efficiency of the lubricants.
  • PRTR pollution release and transfer register
  • Organomolybdenum compounds are said to reduce friction by forming a film comprising mainly molybdenum disulphide on the lubrication surfaces by virtue of a frictional reaction. Therefore, if a compound containing sulphur is used at the same time, formation of the molybdenum disulphide film will be promoted and the friction- reducing effect thereof can be enhanced.
  • 62-207397 A discloses an example of such a lubricant composition, comprising a combination of sulphurised molybdenum dialkyl dithiocarbamates and a sulphur- phosphor type extreme-pressure additive.
  • the type of sulphur-containing compounds to be used and the balance of the amounts of additives to be blended in a lubricant composition are also important factors. In order to allow the organomolybdenum compound to be used effectively, the most suitable compounds must be blended in the most suitable proportions.
  • a lubricant composition has surprisingly been developed which is capable of reducing friction at lubrication points and, by reducing at the same time the amount of molybdenum contained therein, of reducing the burden on the environment. Accordingly, the present invention provides a lubricant composition comprising lubricant base oil;
  • component (B) a zinc dithiocarbamate, wherein the amount of sulphur derived from this component relative to the amount of molybdenum derived from component (A) in terms of the weight ratio is in the range of from 0.2 to 4;
  • component (C) one or more calcium salts of organic acids selected from the group consisting of alkyl phenols, alkyl salicylic acids, aliphatic sulphonic acids and aromatic sulphonic acids, wherein the amount of calcium derived from this component relative to the amount of molybdenum derived from component (A) in terms of the weight ratio is in the range of from 0.2 to 7.
  • the lubricant base oil in the lubricant composition of the present invention may be selected from mineral oils, synthetic oils and mixtures thereof.
  • mineral-type base oils examples include those refined by one or more treatments such as vacuum distillation of an atmospheric residue obtained by atmospheric distillation of crude oil, or wax-isomerised mineral oils and base oils produced by the process in which GTL wax (gas-to-liguid wax) is isomerised by the Fischer-Tropsch process.
  • synthetic oils examples include polyolefins such as ⁇ -olefin oligomers and polybutenes, polyalkylene glycols such as polyethylene glycols and polypropylene glycols, diesters such as di-2- - A -
  • polyol esters such as trimethylolpropane esters and pentaerythritol esters, perfluoroalkyl ethers, silicone oils and polyphenyl ethers.
  • the sulphur-containing organomolybdenum complex used as component (A) in the lubricant composition of the present invention may be conveniently selected from molybdenum dithiocarbamates (MoDTC) and/or molybdenum dithiophosphates (MoDTP) .
  • Preferred molybdenum dithiocarbamates include those according to general formula (I),
  • Preferred molybdenum dithiophosphates include those according to general formula (II),
  • said complex Whilst oxygen atoms or sulphur atoms may indiscriminately be linked to the molybdenum atoms which form the core of the afore-mentioned complex that is component (A) , said complex has a weight ratio of the amount of sulphur relative to the amount of molybdenum therein in the range of from 1 to 1.4. Said weight ratio may be either for a sulphur-containing organomolybdenum complex alone or for the proportion in the total weight of a mixture of several kinds of sulphur-containing organomolybdenum complexes .
  • this weight ratio is less than 1, then the amount of sulphur relative to the molybdenum will be insufficient and an adequate film of molybdenum disulphide will not form on the lubrication surfaces. However, if said weight ratio is greater than 1.4, then the combined effect when blended with the other additives will not be sufficiently obtained and the friction coefficient may rise.
  • molybdenum dithiocarbamates examples include sulphurised molybdenum dibutyldithiocarbamate, sulphurised molybdenum dipentyldithiocarbamate, sulphurised molybdenum hexyldithiocarbamate, sulphurised molybdenum dioctyldithiocarbamate, sulphurised molybdenum didecyldithiocarbamate, sulphurised molybdenum tridecyldithiocarbamate, sulphurised molybdenum diisobutyldithiocarbamate, sulphurised molybdenum di(2- ethylhexyl ) dithiocarbamate, sulphurised molybdenum dilauryldithiocarbamate, sulphurised molybdenum
  • molybdenum dithiophosphates examples include sulphurised molybdenum dibutyldithiophosphate, sulphurised molybdenum dipentyldithiophosphate, sulphurised molybdenum dihexyldithiophosphate, sulphurised molybdenum dioctyldithiophosphate, sulphurised molybdenum didecyldithiophosphate, sulphurised molybdenum tridecyldithiophosphate, sulphurised molybdenum diisobutyldithiophosphate, sulphurised molybdenum di(2- ethylhexyl) dithiophosphate, sulphurised molybdenum dilauryldithiophosphate, sulphurised molybdenum distearyldithiophosphate
  • the amount of the afore-mentioned component (A) in the lubricant composition of the present invention is in the range of from 300 to 3000 ppm by weight, in terms of elemental molybdenum, based on the total weight of the lubricant composition.
  • the amount of component (A) is less than 300 ppm, in terms of elemental molybdenum, based on the total weight of the lubricant composition, then a sufficient friction-reducing effect is not obtained. Furthermore, if the amount of component (A) is more than 3000 ppm in terms of elemental molybdenum, based on the total weight of the lubricant composition, then the friction may increase and the cost of the lubricant composition will also rise.
  • the zinc dithiocarbamate (ZnDTC) of the aforementioned component (B) may be a compound according to general formula (III),
  • R 5 and R 6 are each radicals independently selected from hydrocarbon groups having in the range of from 4 to 18 carbon atoms.
  • R 5 and Re are each independently selected from straight-chain and/or branched groups having in the range of from 4 to 8 carbon atoms .
  • ZnDTC zinc dithiocarbamates
  • the amount of the afore-mentioned component (B) incorporated in the lubricant composition of the present invention is such that the amount of sulphur derived from component (B) relative to the amount of molybdenum derived from the afore-mentioned component (A) in terms of the weight ratio is in the range of from 0.2 to 4. If said weight ratio is less than 0.2, then a film of molybdenum disulphide effective enough to reduce friction on the lubrication surfaces may not form. Furthermore, if said weight ratio is greater than 4, then the friction- reducing function of the sulphur-containing organomolybdenum complex (A) is hindered and the friction properties may even deteriorate.
  • the afore-mentioned component (C) is a compound known as a metallic detergent. Hitherto, barium, magnesium and calcium phenates, salicylates and sulphonates have generally been used as metallic detergents. In the present invention, preferably at least one detergent selected from a group comprised of calcium phenates, calcium salicylates and calcium sulphonates is incorporated in the blend.
  • TBN total base number
  • the TBN of a normally manufactured detergent is typically within the range of from 0 to 500 mgKOH/g.
  • TBN of the calcium salts of organic acids used in the lubricant composition of the present invention there is no particular restriction on the TBN of the calcium salts of organic acids used in the lubricant composition of the present invention and a broad range can be used from neutral to overbased.
  • the amount of the afore-mentioned component (C) incorporated in the lubricant composition of the present invention is such that the amount of calcium derived from this component (C) relative to the amount of molybdenum derived from the afore-mentioned component (A) in terms of the weight ratio is in the range of from 0.2 to 7. If said weight ratio is less than 0.2, then sufficient friction-reducing effect may not be obtained, and if said weight ratio is greater than 7, then the friction- reducing function is hindered and the friction properties may even deteriorate.
  • the lubricant composition of the present invention may optionally further comprise (D) one or more simple metallic soaps, complex metallic soaps thereof and/or urea compounds, i.e. to form a grease.
  • Such simple and complex metallic soaps may be metallic salts of fatty acids or mixtures of fatty acids.
  • Preferred fatty acids in the present invention are stearic acid and 12-hydroxystearic acid.
  • Preferred simple and complex metallic soaps are lithium soaps, calcium soaps, sodium soaps and aluminium soaps.
  • These metallic soaps (D) may be obtained by reacting acids or acid mixtures in particular fatty acids or fatty acid mixtures with a metal hydroxide. Said soaps may be reacted in advance and added to the lubricant base oil or they may be reacted within the lubricant base oil.
  • the lubricant composition of the present invention may optionally comprise (D) one or more compounds selected from the group consisting of lithium soaps, calcium soaps, sodium soaps, aluminium soaps, complex soaps thereof and urea compounds.
  • urea compounds may be conveniently selected from diurea, triurea and/or tetraurea compounds.
  • diurea compounds as illustrated by general formula (IV) are conveniently selected from diurea, triurea and/or tetraurea compounds.
  • hydrocarbon groups located at the terminal positions of the chemical structural formula, R 8 and Rg may be the same or different and each have in the range of from 8 to 18 carbon atoms and where the hydrocarbon group R 7 located in the centre of the chemical structural formula is a hydrocarbon group containing an aromatic ring having in the range of from 6 to 15 carbon atoms.
  • the afore-mentioned urea compounds may be obtained by reacting diisocyanates and monoamines.
  • diisocyanates include diphenylmethane diisocyanate, phenylene diisocyanate, diphenyl diisocyanate, phenyl diisocyanate and tolylene diisocyanate.
  • monoamines include octylamine, dodecylamine, hexadecylamine and octadecylamine .
  • Such diisocyanates and monoamine compounds may either be reacted in advance and the resulting urea compounds added to the lubricant base oil or said diisocyanates and monoamines may be reacted in situ within the lubricant base oil. Also, the afore-mentioned metallic soaps and urea compounds may be used mixed together.
  • said one or more components (D) are present in the lubricant composition, they are present in a total amount in the range of from 2 to 30% by weight, more preferably in an amount in the range of from 5 to 20% by weight, based on the total weight of the lubricant composition. In this way, the lubricant may be made more viscous.
  • the lubricant composition will be in too viscous a state, and there will be a risk that sufficient lubricant will not spread across the friction surfaces .
  • the lubricant composition of the present invention further comprises
  • (D) in the range of from 2 to 30% by weight of one or more compounds selected from the group consisting of lithium soaps, calcium soaps, sodium soaps, aluminium soaps, complex soaps thereof and urea compounds, based on the total weight of the lubricant composition.
  • the present invention further provides a method of reducing friction in the bearings, gears and/or joints of mechanical devices, wherein said method comprises lubricating said bearings, gears and/or joints with a lubricant composition as hereinbefore described.
  • the present invention also provides a bearing, gear and joint, characterised in that the lubricant composition as hereinbefore described is used therein as the lubricant. Furthermore, the present invention also provides the use of a lubricant composition as hereinbefore described to lubricate a bearing, a gear and/or a joint of a mechanical device, and in particular to reduce friction therein .
  • the present invention is described below with reference to the following Examples which are not intended to limit the scope of the present invention in any way. EXAMPLES Examples 1, 2, 5 - 8; Comparative Examples 1, 3, 6, 8
  • diphenylmethane-4-4 ' -diisocyanate (MDI) containing an aromatic ring was added to a portion of mineral oil (kinematic viscosity at 40 0 C: 100 mm 2 /s) used as the lubricant base oil, and these mixtures were heated.
  • a monoamine was added to another portion of the same mineral oil and dissolved by heating.
  • the two afore ⁇ mentioned solutions in lubricant base oils were mixed together and reacted.
  • the various components (A) , (B) and (C) were added so as to give the proportions shown in the Tables.
  • diphenylmethane-4-4 ' -diisocyanate (MDI) was added to a portion of mineral oil (kinematic viscosity at 40 0 C: 100 mm 2 /s) used as the lubricant base oil, and these mixtures were heated. A monoamine was added to the rest of the mineral oil and dissolved by heating. The two afore-mentioned solutions in lubricant base oils were mixed together and reacted, and lithium stearate or lithium 12-hydroxystearate was dissolved therein by heating. After cooling again, the various components (A), (B) and (C) were added so as to give the proportions shown in Table 1. After a homogenising treatment using a three roll mill, the lubricant compositions of Examples 3 and 4 were prepared. Examples 11, 12
  • the "MoDTC" of component (A) was a sulphurised molybdenum dialkyldithiocarbamate, the alkyl group having 13 carbon atoms (but the MoDTC used in Comparative Example 1 had 4 carbon atoms) ;
  • the "MoDTP" of component (A) was a sulphurised molybdenum dialkyldithiophosphate, the alkyl group having 8 carbon atoms;
  • the "ZnDTC” of component (B) was a zinc dialkyldithiocarbamate, the alkyl group having 5 carbon atoms;
  • the "diurea” of component (D) was the reaction product of MDI and a monoamine, the monoamine being octylamine and/or oleylamine.
  • Test machine SRV test rig (manufactured by Optimol) Surface pressure : 2160 MPa Sliding speed : 0.200 m/s Temperature: 30 0 C
  • Test ball diameter 17.5 mm (SUJ2)
  • Test plate diameter 24mm, thickness 7.85 mm (SUJ2) Results of the experiments The results obtained are shown in Tables 1 - 5.
  • Comparative Example 1 and Comparative Example 2 the weight ratios of the sulphur in component (A) and the molybdenum (S/Mo ratio) were outside the range of from 1 to 1.4, and in Comparative Example 3 and Comparative Example 6 the converted elemental amounts of molybdenum derived from component (A) were 250 and 4000 and so were outside the range of from 300 to 3000. Also, in Comparative Example 4 and Comparative Example 6 the amounts of sulphur derived from component (B) in terms of the weight ratio to molybdenum were 5.1 and 0.1, and so were outside the range of from 0.2 to 4.
  • Comparative Example 5 Comparative Example 5 and Comparative Example 8 the amounts of calcium derived from component (C) in terms of the weight ratio to molybdenum were 10.3, 0.1 and 8.7, and so were outside the range of from 0.2 to 7. Furthermore, in Comparative Example 8, the amount of constituent (D) was 35% by weight and so was outside the preferred range of from 2 to 30% by weight.
  • the friction coefficients of the lubricant compositions of these Comparative Examples 1 to 8 were either 0.072 to 0.142 and extremely high compared with the friction coefficients of the afore-mentioned examples according to the present invention, or burning occurred. Therefore, the lubricant composition of the present invention has superior friction characteristics, and can be seen to be an excellent lubricant.

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

Abstract

Composition de lubrifiant comprenant : une huile de base lubrifiante ; (A) de 300 à 3000 ppm en poids, en termes de molybdène élémentaire, d'un complexe organique du molybdène contenant du soufre, sur la base du poids total de la composition de lubrifiant, le rapport du poids du soufre sur celui du molybdène étant dans la plage allant de 1 à 1,4 ; (B) un dithiocarbamate de zinc, le rapport de la quantité de soufre dérivée de ce composant sur la quantité de molybdène dérivée du composant (A) en termes de rapport en poids étant dans la plage allant de 0,2 à 4 ; et (C) un ou plusieurs sels de calcium d'acides organiques sélectionnés dans le groupe constitué d'alkylphénols, d'acides alkylsalicyliques, d'acides sulfoniques aliphatiques et d'acides sulfoniques aromatiques, le rapport de la quantité de calcium dérivée de ce composant sur la quantité de molybdène dérivée du composant (A) en termes de rapport en poids étant dans la plage allant de 0,2 à 7.
PCT/EP2007/051485 2006-02-17 2007-02-15 Composition de lubrifiant WO2007093632A2 (fr)

Applications Claiming Priority (2)

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JP2006/041271 2006-02-17
JP2006041271A JP5027426B2 (ja) 2006-02-17 2006-02-17 潤滑剤組成物

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WO2007093632A3 WO2007093632A3 (fr) 2007-11-22

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104583381A (zh) * 2012-08-28 2015-04-29 Ntn株式会社 等速接头用润滑脂组合物以及封入有其的等速接头
US11193080B2 (en) 2019-03-29 2021-12-07 Idemitsu Kosan Co., Ltd. Lubricating oil composition

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JP5027426B2 (ja) 2012-09-19
AR059576A1 (es) 2008-04-16
JP2007217604A (ja) 2007-08-30

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