EP1057882A1 - Lubricating oil composition for cellulose base wet friction material - Google Patents

Lubricating oil composition for cellulose base wet friction material Download PDF

Info

Publication number
EP1057882A1
EP1057882A1 EP00111046A EP00111046A EP1057882A1 EP 1057882 A1 EP1057882 A1 EP 1057882A1 EP 00111046 A EP00111046 A EP 00111046A EP 00111046 A EP00111046 A EP 00111046A EP 1057882 A1 EP1057882 A1 EP 1057882A1
Authority
EP
European Patent Office
Prior art keywords
base
group
weight
boron
lubricating oil
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Withdrawn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
EP00111046A
Other languages
German (de)
French (fr)
Inventor
Hitoshi Hata
Hisashi Machida
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.)
NSK Ltd
Idemitsu Kosan Co Ltd
Original Assignee
NSK Ltd
Idemitsu Kosan Co Ltd
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 NSK Ltd, Idemitsu Kosan Co Ltd filed Critical NSK Ltd
Publication of EP1057882A1 publication Critical patent/EP1057882A1/en
Withdrawn legal-status Critical Current

Links

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
    • C10M133/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing nitrogen
    • C10M133/52—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing nitrogen having a carbon chain of 30 or more atoms
    • C10M133/56—Amides; Imides
    • 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
    • C10M135/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing sulfur, selenium or tellurium
    • C10M135/02—Sulfurised compounds
    • C10M135/04—Hydrocarbons
    • 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
    • C10M135/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing sulfur, selenium or tellurium
    • C10M135/02—Sulfurised compounds
    • C10M135/06—Esters, e.g. fats
    • 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
    • C10M135/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing sulfur, selenium or tellurium
    • C10M135/12—Thio-acids; Thiocyanates; Derivatives thereof
    • C10M135/14—Thio-acids; Thiocyanates; Derivatives thereof having a carbon-to-sulfur double bond
    • C10M135/18—Thio-acids; Thiocyanates; Derivatives thereof having a carbon-to-sulfur double bond thiocarbamic type, e.g. containing the groups
    • 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
    • C10M135/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing sulfur, selenium or tellurium
    • C10M135/20—Thiols; Sulfides; Polysulfides
    • C10M135/22—Thiols; Sulfides; Polysulfides containing sulfur atoms bound to acyclic or cycloaliphatic carbon atoms
    • 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
    • C10M135/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing sulfur, selenium or tellurium
    • C10M135/20—Thiols; Sulfides; Polysulfides
    • C10M135/22—Thiols; Sulfides; Polysulfides containing sulfur atoms bound to acyclic or cycloaliphatic carbon atoms
    • C10M135/24—Thiols; Sulfides; Polysulfides containing sulfur atoms bound to acyclic or cycloaliphatic carbon atoms containing hydroxy groups; Derivatives 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
    • C10M137/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing phosphorus
    • C10M137/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing phosphorus having no phosphorus-to-carbon bond
    • 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
    • C10M141/00—Lubricating compositions characterised by the additive being a mixture of two or more compounds covered by more than one of the main groups C10M125/00 - C10M139/00, each of these compounds being essential
    • C10M141/10—Lubricating compositions characterised by the additive being a mixture of two or more compounds covered by more than one of the main groups C10M125/00 - C10M139/00, each of these compounds being essential at least one of them being an organic phosphorus-containing compound
    • 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
    • C10M2207/02—Hydroxy compounds
    • C10M2207/023—Hydroxy compounds having hydroxy groups bound to carbon atoms of six-membered aromatic rings
    • C10M2207/024—Hydroxy compounds having hydroxy groups bound to carbon atoms of six-membered aromatic rings having at least two phenol groups but no condensed ring
    • 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
    • C10M2207/28—Esters
    • C10M2207/287—Partial esters
    • C10M2207/289—Partial esters containing free hydroxy groups
    • 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
    • C10M2215/02—Amines, e.g. polyalkylene polyamines; Quaternary amines
    • C10M2215/04—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to acyclic or cycloaliphatic carbon atoms
    • 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
    • C10M2215/02—Amines, e.g. polyalkylene polyamines; Quaternary amines
    • C10M2215/06—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to carbon atoms of six-membered aromatic rings
    • C10M2215/064—Di- and triaryl amines
    • 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
    • C10M2215/086—Imides [having hydrocarbon substituents containing less than thirty carbon atoms]
    • 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
    • C10M2215/22—Heterocyclic nitrogen compounds
    • 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
    • C10M2215/22—Heterocyclic nitrogen compounds
    • C10M2215/221—Six-membered rings containing nitrogen and carbon 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
    • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant Compositions
    • C10M2215/22—Heterocyclic nitrogen compounds
    • C10M2215/225—Heterocyclic nitrogen compounds the rings containing both nitrogen and oxygen
    • 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
    • C10M2215/22—Heterocyclic nitrogen compounds
    • C10M2215/225—Heterocyclic nitrogen compounds the rings containing both nitrogen and oxygen
    • C10M2215/226—Morpholines
    • 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
    • C10M2215/24—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant Compositions having hydrocarbon substituents containing thirty or more carbon atoms, e.g. nitrogen derivatives of substituted succinic acid
    • C10M2215/26—Amines
    • 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
    • C10M2215/24—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant Compositions having hydrocarbon substituents containing thirty or more carbon atoms, e.g. nitrogen derivatives of substituted succinic acid
    • C10M2215/28—Amides; Imides
    • 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
    • C10M2215/24—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant Compositions having hydrocarbon substituents containing thirty or more carbon atoms, e.g. nitrogen derivatives of substituted succinic acid
    • C10M2215/30—Heterocyclic compounds
    • 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
    • C10M2217/046—Polyamines, i.e. macromoleculars obtained by condensation of more than eleven amine monomers
    • 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
    • C10M2217/06—Macromolecular compounds obtained by functionalisation op polymers with a nitrogen containing compound
    • 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
    • C10M2219/02—Sulfur-containing compounds obtained by sulfurisation with sulfur or sulfur-containing compounds
    • C10M2219/022—Sulfur-containing compounds obtained by sulfurisation with sulfur or sulfur-containing compounds of hydrocarbons, e.g. olefines
    • 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
    • C10M2219/02—Sulfur-containing compounds obtained by sulfurisation with sulfur or sulfur-containing compounds
    • C10M2219/024—Sulfur-containing compounds obtained by sulfurisation with sulfur or sulfur-containing compounds of esters, e.g. fats
    • 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
    • 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
    • C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
    • C10M2219/08—Thiols; Sulfides; Polysulfides; Mercaptals
    • C10M2219/082—Thiols; Sulfides; Polysulfides; Mercaptals containing sulfur atoms bound to acyclic or cycloaliphatic carbon atoms
    • 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
    • C10M2219/08—Thiols; Sulfides; Polysulfides; Mercaptals
    • C10M2219/082—Thiols; Sulfides; Polysulfides; Mercaptals containing sulfur atoms bound to acyclic or cycloaliphatic carbon atoms
    • C10M2219/083—Dibenzyl sulfide
    • 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
    • C10M2219/08—Thiols; Sulfides; Polysulfides; Mercaptals
    • C10M2219/082—Thiols; Sulfides; Polysulfides; Mercaptals containing sulfur atoms bound to acyclic or cycloaliphatic carbon atoms
    • C10M2219/084—Thiols; Sulfides; Polysulfides; Mercaptals containing sulfur atoms bound to acyclic or cycloaliphatic carbon atoms containing hydroxy groups; Derivatives 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
    • C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
    • C10M2219/08—Thiols; Sulfides; Polysulfides; Mercaptals
    • C10M2219/082—Thiols; Sulfides; Polysulfides; Mercaptals containing sulfur atoms bound to acyclic or cycloaliphatic carbon atoms
    • C10M2219/085—Thiols; Sulfides; Polysulfides; Mercaptals containing sulfur atoms bound to acyclic or cycloaliphatic carbon atoms containing carboxyl groups; Derivatives 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
    • 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
    • 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
    • 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
    • C10M2223/042—Metal salts 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
    • 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
    • C10M2223/049—Phosphite
    • 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
    • C10M2223/10—Phosphatides, e.g. lecithin, cephalin
    • 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
    • C10M2223/12—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions obtained by phosphorisation of organic compounds, e.g. with PxSy, PxSyHal or PxOy
    • 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
    • C10M2225/00—Organic macromolecular compounds containing phosphorus as ingredients in lubricant compositions
    • C10M2225/04—Organic macromolecular compounds containing phosphorus as ingredients in lubricant compositions obtained by phosphorisation of macromolecualr compounds not containing phosphorus in the monomers
    • 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
    • C10M2227/00—Organic non-macromolecular compounds containing atoms of elements not provided for in groups C10M2203/00, C10M2207/00, C10M2211/00, C10M2215/00, C10M2219/00 or C10M2223/00 as ingredients in lubricant compositions
    • C10M2227/06—Organic compounds derived from inorganic acids or metal salts
    • C10M2227/061—Esters derived from boron
    • 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
    • C10M2229/00—Organic macromolecular compounds containing atoms of elements not provided for in groups C10M2205/00, C10M2209/00, C10M2213/00, C10M2217/00, C10M2221/00 or C10M2225/00 as ingredients in lubricant compositions
    • C10M2229/04—Siloxanes with specific structure
    • C10M2229/041—Siloxanes with specific structure containing aliphatic substituents
    • 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
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/04—Oil-bath; Gear-boxes; Automatic transmissions; Traction drives
    • C10N2040/042—Oil-bath; Gear-boxes; Automatic transmissions; Traction drives for automatic transmissions
    • 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
    • C10N2040/044—Oil-bath; Gear-boxes; Automatic transmissions; Traction drives for manual transmissions
    • 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
    • C10N2040/046—Oil-bath; Gear-boxes; Automatic transmissions; Traction drives for traction drives

Definitions

  • the present invention relates to a lubricating oil composition for a cellulose base wet friction material. More particularly, the present invention is concerned with a lubricating oil composition which enhances peeling resistant durability for a friction material, especially a cellulose base wet friction material without impairing the wear resistance or scoring resistance of a steel material element, and which is well suited as a lubricating oil composition for use in a cellulose base friction material for a starting and running device and a transmission clutch that are employed in an automatic transmission of an automobile.
  • Said belt-drive continuously variable transmission and traction drive continuously variable transmission are each equipped with a starting/running device and a lock-up clutch, and besides the belt-drive portion and traction drive portions each become a new lubricating element.
  • a lubricating oil is called upon to have lubricating characteristics for lubricating portions of high surface pressure such as gears, roller bearings, belt-drive portions and traction drive portions in addition to the friction characteristics of a friction material, for instance, to have wear resistance and scoring ( seizure ) resistance therefor.
  • a lubricating oil to be used in an automobile transmission is called upon to be imparted with friction characteristics for a friction material ( wet clutch ) and at the same time, wear resistance and scoring (seizure) resistance, thus bringing about a trend towards the use of an additive having high reactivity with a metallic surface.
  • an additive having high reactivity with a metallic surface that is, an active additive is highly active also with cellulose which is a principal component of a friction material.
  • an active additive suffers from such disadvantages that brings about cutoff of cellulose structure ( cutoff of cellulose fibers in the form of rings and chains) and elution thereof in oil or the like, and are more prone to cause damage such as peeling to a friction material.
  • a general object of the present invention is to provide a lubricating oil composition which enhances peeling resistant durability for a friction material, especially a cellulose base wet friction material without impairing the wear resistance or scoring resistance of a steel material element, and which is well suited as a lubricating oil composition for use in a cellulose base friction material for a starting and running device and a transmission clutch that are employed in an automatic transmission of an automobile.
  • a lubricating oil composition which comprises a base oil blended with a specific boron-containing imide base dispersant so that the boron content and the nitrogen content in the base oil are made to be at least a prescribed value, respectively based on said base oil.
  • the present invention has been accomplished by the foregoing findings and information.
  • the present invention provides a lubricating oil composition for a cellulose base wet friction material which comprises a base oil blended with (A) a boron-containing imide base dispersant having a weight-average molecular weight in the range of 500 to 3000 and a ratio by weight of boron to nitrogen (B/N) in the range of 0.1 to 1.5 in such blending amounts that the boron content and the nitrogen content each derived from the component (A) in the base oil are made to be at least 60 ppm by weight and at least 100 ppm by weight, respectively based on said base oil.
  • the base oil to be used in the lubricating oil composition according to the present invention is not specifically limited, but may be properly and optionally selected for use from the base oils which have heretofore been customarily used as a lubricating oil composition in an automatic transmission of an automobile, and which are exemplified by mineral oils and synthetic oil as described hereunder.
  • mineral oils examples include neutral oils that are produced by solvent refining or hydrorefining such as 60 neutral oil, 100 neutral oil, 150 neutral oil, 300 neutral oil and 500 neutral oil, and base oils having a low pour point and improved in low temperature fluidity by removing wax component therefrom. Any of the aforesaid mineral oils may be used alone or in combination with at least one other species.
  • examples of the synthetic oils include synthetic naphthene base oil, poly ⁇ -olefin oligomer and ester base synthetic oils such as diester base, polyol ester base and polyglycol ester base. Any of the aforesaid synthetic oils is usually used alone, but may be used as a blend with the above exemplified mineral oils.
  • the base oil is used usually in an amount of at least 80% by weight based on the lubricating oil composition.
  • a boron-containing imide base dispersant having a weight average molecular weight in the range of 500 to 3000 and a ratio by weight of boron to nitrogen (B/N) in the range of 0.1 to 1.5.
  • B/N boron-containing imide base dispersant having a weight average molecular weight in the range of 500 to 3000 and a ratio by weight of boron to nitrogen (B/N) in the range of 0.1 to 1.5.
  • the suitable boron-containing imide base dispersant is that which has a weight-average molecular weight in the range of 700 to 2500 and a ratio by weight of boron to nitrogen (B/N) in the range of 0.2 to 1.0.
  • the aforesaid boron-containing imide base dispersant as the component (A) is not specifically limited, provided that it is imparted with the above-mentioned properties, and it may be properly and optionally selected for use from among the additives for a lubricating oil that have heretofore been customarily used therefor.
  • the foregoing boron-containing imide base dispersant is exemplified by the compound obtained by treating, with a boron compound, a monopolyalkenyl or polyalkyl succinimide represented by the general formula (I): or bispolyalkenyl or polyalkyl succinimide represented by the general formula (II):
  • R 1 , R 3 and R 4 are each independently an oligomer residue of an ⁇ -olefin having approximately 2 to 8 carbon atoms or a hydrate thereof, R 3 and R 4 may be the same or different, R 2 , R 5 and R 6 are each independently an alkylene group having 2 to 4 carbon atoms, R 5 and R 6 may be the same or different, m is an integer from 1 to 10, and n is 0 or an integer from 1 to 10.
  • the boron-containing imide base dispersant as the component (A) may be any of the boron-treated mono-compound represented by the general formula (I), the boron treated bis-compound represented by the general formula (II) and a mixture of the above two.
  • the aforesaid polyalkenyl or polyalkyl succinimide represented by the general formula (I) or (II) can be produced usually by allowing polyalkenyl succinimide anhydride which is obtained by the reaction between a polyolefin and maleic anhydride or the hydride thereof, namely polyalkyl succinimide anhydride to react with a polyalkylene polyamine.
  • the above-mentioned mono-compound or bis-compound of the polyalkenyl or polyalkyl succinimide can be produced usually by altering the reaction ratio of the polyalkenyl or polyalkyl succinimide anhydride to the polyalkylene polyamine.
  • the polyolefin which is used as a starting raw material in the production of the aforesaid polyalkenyl or polyalkyl succinimide is properly and optionally selected for use from the polyolefin which is obtained by polymerizing an ⁇ -olefin having approximately 2 to 8 carbon atoms so that the boron containing succinimide base dispersant as the final objective product has a a weight-average molecular weight in the range of 500 to 3000.
  • the ⁇ -olefin which constitutes the polyolefin may be used alone or in combination with at least one other species.
  • polybutene is particularly preferable.
  • polyalkylene polyamine is exemplified by polyethylene polyamine, polypropylene polyamine and polybutylene polyamine, of which polyethylene polyamine is preferable.
  • polyalkenyl or polyalkyl succinimide there is preferably usable polyalkenyl succinimide, especially polybutenyl succinimide having a weight-average molecular weight of approximately 500 to 3000.
  • the boron-containing imide base dispersant as the components (A) be blended so that the boron content and the nitrogen content that are derived from the component (A) are made to be at least 60 ppm by weight and 100 ppm by weight, respectively on the basis of the base oil.
  • the boron content is less than 60 ppm by weight or the nitrogen content is less than 100 ppm by weight, it is made impossible to alleviate or suppress the unfavorable attack by active phosphate ester base compounds and active sulfur base compound against the cellulose base friction material ( acceleration of cutoff and dissolution of cellulose chains due to the reaction between the cellulose and the active phosphorus base compounds and/or the active sulfur base compounds ). Further, the friction material is more liable to be early peeled or damaged on the surface thereof.
  • the boron content is in the range of preferably 60 to 500 ppm by weight, more preferably 60 to 300 ppm by weight and at the same time, the nitrogen content is in the range of preferably 100 to 2000 ppm by weight, more preferably 100 to 1200 ppm by weight.
  • the component (B) there is usually incorporated therein as the component (B), at least one member selected from the group consisting of active phosphorus base compounds and active sulfur base compounds.
  • the above-mentioned active phosphorus base compound to be used as the component (B) is not specifically limited, but may be properly and optionally selected for use in accordance with the situation from among the well known active phosphorus base compounds that have heretofore been used as an extreme pressure agent, an wear resistant agent, a friction modifying agent and the like, for instance, acidic phosphate esters, phosphite esters, acidic phosphite esters and hypophosphite esters.
  • the active phosphate ester base compound to be used in the lubricating oil composition according to the present invention there are preferably used the acidic phosphate esters and/or phosphite esters represented by the general formula (III): wherein A is hydrogen atom or hydroxyl group, k is 0 or 1 with the proviso that A is hydroxyl group when k is 0, and A is hydrogen atom or hydroxyl group when k is 1, and R 7 and R 8 are each hydrogen atom or a hydrocarbon group which has 1 to 18 carbon atoms and may contain at least one oxygen atom and/or at least one sulfur atom.
  • Examples of the aforesaid hydrocarbon group which has 1 to 18 carbon atoms include a straight chain or branched alkyl group having 1 to 18 carbon atoms; a cycloalkyl group having 3 to 18 carbon atoms; a straight chain or branched alkenyl group having 2 to 18 carbon atoms; an aryl group having 6 to 18 carbon atoms; and an aralkyl group having 7 to 18 carbon atoms.
  • alkyl group having 1 to 18 carbon atoms examples include methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, sec-butyl group, tert-butyl group, pentyl group, hexyl group, octyl group, 2-ethylhexyl group, decyl group, dodecyl group, tetradecyl group, hexadecyl group and octadecyl group.
  • Examples of the cycloalkyl group having 3 to 18 carbon atoms group include cyclopentyl group, cyclohexyl group, methylcyclohexyl group and cyclooctyl group.
  • Examples of alkenyl group having 2 to 18 carbon atoms include allyl group, propenyl group, butenyl group, octenyl group, decenyl group and oleyl group.
  • Examples of aryl group having 6 to 18 carbon atoms include phenyl group, tolyl group, xylyl group and naphthyl group.
  • Examples of aralkyl group having 7 to 18 carbon atoms include benzyl group, phenethyl group and naphthylmethyl group.
  • the hydrocarbon group having 1 to 18 carbon atoms may contain at least one oxygen atom and/or at least one sulfur atom. That is to say, the above-mentioned hydrocarbon group may contain at least one ether group, or at least one thioether group, or both said groups in its main chain.
  • Examples of the aforesaid hydrocarbon group include hexyloxymethyl group, hexyloxyethyl group, octyloxymethyl group, octyloxyethyl group, dodecyloxymethyl group, dodecyloxyethyl group, hexadecyloxymethyl group, hexadecyloxyethyl group, hexylthiomethyl group, hexylthioethyl group, octylthiomethyl group, octylthioethyl group, dodecylthiomethyl group, dodecylthioethyl group, hexadecylthiomethyl group and hexadecylthioethyl group.
  • the R 7 and R 8 may be the same as or different from each other, but are not simultaneously hydrogen atom.
  • Examples of the acidic phosphate ester among the compound represented by the general formula (III) include the compound having the structure represented by the general formula (III-a) wherein R 7 and R 8 are each as previously defined.
  • Examples of the acidic phosphate ester represented by the general formula (III-a ) include mono- or di-hexylhydrogen phosphate, mono- or di-octylhydrogen phosphate, mono- or di-dodecylhydrogen phosphate, mono- or di-hexadecylhydrogen phosphate, mono- or di-(hexylthioethyl)hydrogen phosphate, mono- or di-(octylthioethyl)hydrogen phosphate, mono- or di-(dodecylthioethyl)hydrogen phosphate, mono- or di-(hexadecylthioethyl)hydrogen phosphate, mono- or di-octenylhydrogen phosphate, mono- or di-oleylhydrogen phosphate, mono- or di-cyclohexylhydroqen phosphate, mono- or di-phenylhydrogen phosphate, mono- or di-
  • Examples of the phosphite ester among the compound represented by the general formula (II) include the acidic phosphite ester having the structure represented by the general formula (III-b) or (III-c): wherein R 7 and R 8 are each as previously defined.
  • Examples of the acidic phosphite ester represented by the general formula (III-b) or (III-c) include mono- or di-hexylhydrogen phosphite, mono- or di-octylhydrogen phosphite, mono- or di-dodecylhydrogen phosphite, mono- or di-hexadecylhydrogen phosphite, mono- or di-(hexylthioethyl)hydrogen phosphite, mono- or di-(octylthioethyl)hydrogen phosphite, mono- or di-(dodecylthioethyl)hydrogen phosphite, mono- or di-(hexadecylthioethyl)hydrogen phosphite, mono- or di-octenylhydrogen phosphite, mono- or di-oleylhydrogen phosphite,
  • the above-mentioned active sulfur base compound to be used as the component (B) is not specifically limited, but may be properly and optionally selected for use from among the well known active sulfur base compounds that have heretofore been used as an extreme pressure agent, an anti-wear agent, a friction modifier and the like, for instance, a sulfurized fat and oil, that is, a sulfurized animal oil, vegetable oil or synthetic oil; an olefin mono- or poly-sulfide; a dihydrocarbyl mono- or poly-sulfide ; a sulfurized mineral oil; a thiocarbamate; thioterpene; and dialkylthiodipropionate.
  • a sulfurized fat and oil that is, a sulfurized animal oil, vegetable oil or synthetic oil
  • an olefin mono- or poly-sulfide a dihydrocarbyl mono- or poly-sulfide
  • a sulfurized mineral oil a thiocarbamate
  • thioterpene and dialky
  • sulfurized fat and oil examples include sulfurized lard, sulfurized rapeseed oil, sulfurized castor oil, sulfurized soybean oil, sulfurized bran oil, disulfurized fatty acid such as sulfurized oleic acid and sulfurized ester such as sulfurized methyl oleate.
  • olefin mono- or poly- sulfide examples include a product which is produced by reacting an olefin having 3 to 20 carbon atoms, preferably propylene, isobutene or diisobutene or any of its dimer, trimer and tetramer with a sulfurizing agent specifically exemplified by sulfur, sulfur chloride and other sulfur halogenides.
  • the above-cited dihydrocarbyl mono- or poly-sulfide is a compound represented by the general formula (IV): R 9 ⁇ Sx ⁇ R 10 wherein R 9 and R 10 are each an alkyl group having 1 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, an alkylaryl group having 7 to 20 carbon atoms, or an aralkyl group having 7 to 20 carbon atoms, and may be the same as or different from each other, and x is a real number from 1 to 8, more specifically a rational number.
  • R 9 and R 10 in the foregoing general formula (IV) include methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, sec-butyl group, tert-butyl group, each pentyl group, each hexyl group, each heptyl group, each octyl group, each nonyl group, each decyl group, each dodecyl group, cyclohexyl group, cyclooctyl group, phenyl group, naphthyl group, tolyl group, xylyl group, benzyl group and phenethyl group.
  • dihydrocarbyl mono- or poly-sulfide is preferably exemplified by dibenzyl mono- or poly-sulfide, di-tert-nonyl mono- or poly-sulfide and didodecyl mono- or poly-sulfide.
  • Examples of the thiocarbamate are zinc dithiocarbamate, etc., those of the thioterpene are a reaction product between phosphorus pentasulfide and pinene, and the like, and those of the dialkylthio-dipropionate are dilaurylthio-dipropionate, distearylthio-dipropionate, and the like.
  • the active phosphorus base compound or the active sulfur base compound as the component (B) may be used alone or in combination with at least one other species.
  • the blending amount of the component (B) is not specifically limited provided that said amount falls within the scope of the amount usually employed in a transmission lubricating oil for automobiles.
  • the above-mentioned boron-containing imide base dispersant as the component (A) and the active phosphorus base compound as the component (B) can be blended in the base oil after mixing in advance both the components as desired, and then subjecting the resultant mixture to heating treatment at a temperature in the range of 120 to 150°C for at least 5 hours. It is acceptable in this case to mix the component (A) in part and the active phosphorus base compound as the component (B) in part that are to be blended, subject the resultant mixture to heating treatment, and subsequently mix into the base oil, the heated mixture and the remainders of the component (A) and the component (B). Alternatively, it is also acceptable in this case to mix the component (A) in whole and the component (B) in whole that are to be blended, subject the resultant mixture to heating treatment, and subsequently mix the heated mixture into the base oil.
  • the above-mentioned method for heating treatment of both the components comprises the steps of mixing the component (A) and the component (B) at a prescribed ratio, agitating the resultant mixture at a temperature in the range of approximately 40 to 70°C for approximately 10 minutes to 3 hours to carry out homogenization treatment, and subsequently subjecting the resultant homogenizedly treated mixture to heating treatment at a temperature in the range of 120 to 150°C for at least 5 hours, preferably for 5 to 24 hours, wherein said heating treatment may be put into practice under standing still or under stirring.
  • the lubricating oil composition according to the present invention may be properly and optionally incorporated at need with any of other well known additives, which are exemplified by antioxidants of phenol base, amine base and zinc dithiophosphate base; detergents / dispersants of imide base, ester base, benzylamine base, phenate base and salicylate base; friction modifiers of amide base, ester base and fatty acid base;rust preventive agents of metal sulfonate base, succinate ester base and sorbitan ester base; metal deactivators of bentotriazole base and thiadiazole base; and anti-foam agents of silicone base; and the like.
  • antioxidants of phenol base, amine base and zinc dithiophosphate base detergents / dispersants of imide base, ester base, benzylamine base, phenate base and salicylate base
  • friction modifiers of amide base, ester base and fatty acid base rust preventive agents of metal sulfonate base
  • the lubricating oil composition according to the present invention enhances peeling resistant durability for a friction material, especially a cellulose base wet friction material without impairing the wear resistance or scoring resistance of a steel material element, and thus is well suited for use in a cellulose base friction material for a starting and running device and a transmission clutch that are employed in an automatic transmission of an automobile.
  • Filter paper immersion test was carried out by placing 75ml of a sample oil in a 100 ml wide mouthed vessel, immersing two sheets of # 51 B filter paper manufactured by ADVA NTEC Co. Ltd. (measuring 20 ⁇ 80 mm, made of pure cellulose) in the sample oil, covering the vessel with a lid made of aluminum foil, and heating the vessel in a thermostat (air bath ) at 175°C for 40 hours under standing still condition.
  • the filter paper was weighed before and after the test, and the weight loss of the filter paper was calculated by the following formula, in which the more the weight loss thereof, the severer the attack to the cellulose as the filter paper material.
  • weight loss (%) ⁇ (weight before test-weight after test) /weight before test ⁇ ⁇ 100
  • Various lubricating oil compositions were each prepared by blending at least one of the additives 1 to 7, the blending amounts of which are shown in Table 1 with a 150 neutral oil as a paraffin base mineral oil (manufactured by Idemitsu Kosan Co., Ltd.) having kinematic viscosity of 30.7 mm 2 /sec at 40°C and 5.25 mm 2 /sec at 100°C and a viscosity index of 104, and further blending therewith, 0.5% by weight of 4, 4'-methylenebis(2, 6-di-tert-butylphenol) ⁇ manufactured by Ethyl Japan Co.,Ltd. ⁇ , 0.5% by weight of 4, 4'-dioctylphenylamine ⁇ manufactured by Kawaguchi Chemical Co., Ltd. ⁇ , 0.3% by weight of oleic acid monoglyceride ⁇ manufactured by Kao Corporation ⁇ , 0.02% by weight of 1, 2, 3-benzotriazole ⁇ manufactured by Johoku Chemical Co.,
  • Example 1 2 3 4 5 Component(A) (wt%) Additive 1 0.5 1.0 - - 0.5 Additive 2 - - 2.0 - - Additive 3 - - - 0.7 - Component(B) (wt%) Additive 4 0.2 0.2 0.2 0.2 - Additive 5 - - - - 1.0 Other component (wt%) Additive 6 - - - - - Additive 7 - - - - - - Boron content in oil derived from component (A) in lubricating oil composition (wt ppm) 100 200 66 80 100 Nitrogen content in oil derived from component (A) or other components in lubricating oil composition (wt ppm) 103 205 270 102 103 Weight loss of filter paper (wt%) 10.6 5.8 7.4 12.6 6.4 Comparative Example 1 2 3 4 5 6 Component(A) (wt%) Additive 1 0.5 1.0 - - 0.5 Additive

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

There is disclosed a lubricating oil composition for cellulose base wet friction material which comprises a base oil blended with (A) a boron-containing imide base dispersant (e.g. boron treated polyalkenyl succinimide) having a weight-average molecular weight in the range of 500 to 3000 and having a ratio by weight of boron to nitrogen (B/N) in the range of 0.1 to 1.5 in such a blending amount that the boron content and the nitrogen content each derived from the component (A) are made to be at least 60 ppm by weight and at least 100 ppm by weight, respectively based on the base oil. The above lubricating oil composition enhances peeling resistant durability for a friction material, especially a cellulose base friction material without impairing the wear resistance or scoring resistance of a steel material element, and is well suited for use in a cellulose base friction material for a starting and running device and a transmission clutch that are used in an automatic transmission of an automobile.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a lubricating oil composition for a cellulose base wet friction material. More particularly, the present invention is concerned with a lubricating oil composition which enhances peeling resistant durability for a friction material, especially a cellulose base wet friction material without impairing the wear resistance or scoring resistance of a steel material element, and which is well suited as a lubricating oil composition for use in a cellulose base friction material for a starting and running device and a transmission clutch that are employed in an automatic transmission of an automobile.
2. Description of the Related Arts.
It has become popular in recent years to employ as an automobile transmission, a conventional automatic transmission, a belt-drive continuously variable transmission, a traction drive continuously variable transmission and the like.
Accompanying the aforesaid widened variety of automobile transmissions, a transmission oil undergoes change in required characteristics.
Said belt-drive continuously variable transmission and traction drive continuously variable transmission are each equipped with a starting/running device and a lock-up clutch, and besides the belt-drive portion and traction drive portions each become a new lubricating element. Accompanying the recent progress of miniaturization, lightweightness and maximization of transmission capacity, a lubricating oil is called upon to have lubricating characteristics for lubricating portions of high surface pressure such as gears, roller bearings, belt-drive portions and traction drive portions in addition to the friction characteristics of a friction material, for instance, to have wear resistance and scoring ( seizure ) resistance therefor.
As mentioned before, a lubricating oil to be used in an automobile transmission is called upon to be imparted with friction characteristics for a friction material ( wet clutch ) and at the same time, wear resistance and scoring (seizure) resistance, thus bringing about a trend towards the use of an additive having high reactivity with a metallic surface.
However, an additive having high reactivity with a metallic surface, that is, an active additive is highly active also with cellulose which is a principal component of a friction material. Thus the aforesaid active additive suffers from such disadvantages that brings about cutoff of cellulose structure ( cutoff of cellulose fibers in the form of rings and chains) and elution thereof in oil or the like, and are more prone to cause damage such as peeling to a friction material.
In such circumstances, there has eagerly been desired the development of a lubrication technology capable of alleviating and suppressing the attacking property ( reactivity ) for cellulose which reaction is responsible for peeling and the like of a friction material, without impairing the wear resistance and scoring resistance thereof.
There has scarcely been any report on the technique for alleviating and suppressing the peeling damage to a friction material except the working effect of a metal base detergent dispersant (calcium sulfonate having a total base number of 300 ) { refer to preliminary prints for scientific lecture, Japan Automotive Engineering Society, 952, 9535297, 1995-5 }. Nevertheless, in the case of blending the metal base detergent dispersant, there is caused the problem of a fear of clogging the pores on the surface of a friction material, thus deteriorating the lubricating characteristics and the like.
SUMMARY OF THE INVENTION
Under such circumstances, a general object of the present invention is to provide a lubricating oil composition which enhances peeling resistant durability for a friction material, especially a cellulose base wet friction material without impairing the wear resistance or scoring resistance of a steel material element, and which is well suited as a lubricating oil composition for use in a cellulose base friction material for a starting and running device and a transmission clutch that are employed in an automatic transmission of an automobile.
Other objects of the present invention will be obvious from the text of this specification hereinafter disclosed.
In view of the foregoing, intensive extensive research and investigation were accumulated by the present inventors in order to achieve the above-mentioned objects. As a result, it has been found that the objects can effectively be attained by a lubricating oil composition which comprises a base oil blended with a specific boron-containing imide base dispersant so that the boron content and the nitrogen content in the base oil are made to be at least a prescribed value, respectively based on said base oil. The present invention has been accomplished by the foregoing findings and information.
Specifically, the present invention provides a lubricating oil composition for a cellulose base wet friction material which comprises a base oil blended with (A) a boron-containing imide base dispersant having a weight-average molecular weight in the range of 500 to 3000 and a ratio by weight of boron to nitrogen (B/N) in the range of 0.1 to 1.5 in such blending amounts that the boron content and the nitrogen content each derived from the component (A) in the base oil are made to be at least 60 ppm by weight and at least 100 ppm by weight, respectively based on said base oil.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The base oil to be used in the lubricating oil composition according to the present invention is not specifically limited, but may be properly and optionally selected for use from the base oils which have heretofore been customarily used as a lubricating oil composition in an automatic transmission of an automobile, and which are exemplified by mineral oils and synthetic oil as described hereunder.
Examples of the mineral oils include neutral oils that are produced by solvent refining or hydrorefining such as 60 neutral oil, 100 neutral oil, 150 neutral oil, 300 neutral oil and 500 neutral oil, and base oils having a low pour point and improved in low temperature fluidity by removing wax component therefrom. Any of the aforesaid mineral oils may be used alone or in combination with at least one other species.
On the one hand, examples of the synthetic oils include synthetic naphthene base oil, polyα-olefin oligomer and ester base synthetic oils such as diester base, polyol ester base and polyglycol ester base. Any of the aforesaid synthetic oils is usually used alone, but may be used as a blend with the above exemplified mineral oils.
In the present invention, the base oil is used usually in an amount of at least 80% by weight based on the lubricating oil composition.
In the lubricating oil composition according to the present invention, there is used as the component (A), a boron-containing imide base dispersant having a weight average molecular weight in the range of 500 to 3000 and a ratio by weight of boron to nitrogen (B/N) in the range of 0.1 to 1.5. In the case where the weight-average molecular weight departs from the aforesaid range, or the ratio by weight of boron to nitrogen (B/N) deviates from said range, it is made impossible to obtain the lubricating oil composition imparted with the prescribed performances, thus failing to achieve the objects of the present invention. In view of the performances of the lubricating oil composition, the suitable boron-containing imide base dispersant is that which has a weight-average molecular weight in the range of 700 to 2500 and a ratio by weight of boron to nitrogen (B/N) in the range of 0.2 to 1.0.
The aforesaid boron-containing imide base dispersant as the component (A) is not specifically limited, provided that it is imparted with the above-mentioned properties, and it may be properly and optionally selected for use from among the additives for a lubricating oil that have heretofore been customarily used therefor. The foregoing boron-containing imide base dispersant is exemplified by the compound obtained by treating, with a boron compound, a monopolyalkenyl or polyalkyl succinimide represented by the general formula (I):
Figure 00060001
or bispolyalkenyl or polyalkyl succinimide represented by the general formula (II):
Figure 00060002
In the general formulae (I) and (II), R1, R3 and R4 are each independently an oligomer residue of an α-olefin having approximately 2 to 8 carbon atoms or a hydrate thereof, R3 and R4 may be the same or different, R2, R5 and R6 are each independently an alkylene group having 2 to 4 carbon atoms, R5 and R6 may be the same or different, m is an integer from 1 to 10, and n is 0 or an integer from 1 to 10.
In the present invention, the boron-containing imide base dispersant as the component (A) may be any of the boron-treated mono-compound represented by the general formula (I), the boron treated bis-compound represented by the general formula (II) and a mixture of the above two.
The aforesaid polyalkenyl or polyalkyl succinimide represented by the general formula (I) or (II) can be produced usually by allowing polyalkenyl succinimide anhydride which is obtained by the reaction between a polyolefin and maleic anhydride or the hydride thereof, namely polyalkyl succinimide anhydride to react with a polyalkylene polyamine. The above-mentioned mono-compound or bis-compound of the polyalkenyl or polyalkyl succinimide can be produced usually by altering the reaction ratio of the polyalkenyl or polyalkyl succinimide anhydride to the polyalkylene polyamine.
The polyolefin which is used as a starting raw material in the production of the aforesaid polyalkenyl or polyalkyl succinimide, is properly and optionally selected for use from the polyolefin which is obtained by polymerizing an α-olefin having approximately 2 to 8 carbon atoms so that the boron containing succinimide base dispersant as the final objective product has a a weight-average molecular weight in the range of 500 to 3000. Moreover the α-olefin which constitutes the polyolefin may be used alone or in combination with at least one other species. As the polyolefin, polybutene is particularly preferable.
On the one hand, the foregoing polyalkylene polyamine is exemplified by polyethylene polyamine, polypropylene polyamine and polybutylene polyamine, of which polyethylene polyamine is preferable.
Of the aforesaid polyalkenyl or polyalkyl succinimide, there is preferably usable polyalkenyl succinimide, especially polybutenyl succinimide having a weight-average molecular weight of approximately 500 to 3000.
In the lubricating oil composition according to the present invention, it is necessary that the boron-containing imide base dispersant as the components (A) be blended so that the boron content and the nitrogen content that are derived from the component (A) are made to be at least 60 ppm by weight and 100 ppm by weight, respectively on the basis of the base oil. In the case where the boron content is less than 60 ppm by weight or the nitrogen content is less than 100 ppm by weight, it is made impossible to alleviate or suppress the unfavorable attack by active phosphate ester base compounds and active sulfur base compound against the cellulose base friction material ( acceleration of cutoff and dissolution of cellulose chains due to the reaction between the cellulose and the active phosphorus base compounds and/or the active sulfur base compounds ). Further, the friction material is more liable to be early peeled or damaged on the surface thereof. Taking into consideration the effective suppression of damage to the surface of the friction material, economical efficiency relating to the blending of the component, the boron content is in the range of preferably 60 to 500 ppm by weight, more preferably 60 to 300 ppm by weight and at the same time, the nitrogen content is in the range of preferably 100 to 2000 ppm by weight, more preferably 100 to 1200 ppm by weight.
In the lubricating oil composition according to the present invention, there is usually incorporated therein as the component (B), at least one member selected from the group consisting of active phosphorus base compounds and active sulfur base compounds.
The above-mentioned active phosphorus base compound to be used as the component (B) is not specifically limited, but may be properly and optionally selected for use in accordance with the situation from among the well known active phosphorus base compounds that have heretofore been used as an extreme pressure agent, an wear resistant agent, a friction modifying agent and the like, for instance, acidic phosphate esters, phosphite esters, acidic phosphite esters and hypophosphite esters.
As the active phosphate ester base compound to be used in the lubricating oil composition according to the present invention, there are preferably used the acidic phosphate esters and/or phosphite esters represented by the general formula (III):
Figure 00090001
wherein A is hydrogen atom or hydroxyl group, k is 0 or 1 with the proviso that A is hydroxyl group when k is 0, and A is hydrogen atom or hydroxyl group when k is 1, and R7 and R8 are each hydrogen atom or a hydrocarbon group which has 1 to 18 carbon atoms and may contain at least one oxygen atom and/or at least one sulfur atom.
Examples of the aforesaid hydrocarbon group which has 1 to 18 carbon atoms include a straight chain or branched alkyl group having 1 to 18 carbon atoms; a cycloalkyl group having 3 to 18 carbon atoms; a straight chain or branched alkenyl group having 2 to 18 carbon atoms; an aryl group having 6 to 18 carbon atoms; and an aralkyl group having 7 to 18 carbon atoms. Examples of the alkyl group having 1 to 18 carbon atoms include methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, sec-butyl group, tert-butyl group, pentyl group, hexyl group, octyl group, 2-ethylhexyl group, decyl group, dodecyl group, tetradecyl group, hexadecyl group and octadecyl group. Examples of the cycloalkyl group having 3 to 18 carbon atoms group include cyclopentyl group, cyclohexyl group, methylcyclohexyl group and cyclooctyl group. Examples of alkenyl group having 2 to 18 carbon atoms include allyl group, propenyl group, butenyl group, octenyl group, decenyl group and oleyl group. Examples of aryl group having 6 to 18 carbon atoms include phenyl group, tolyl group, xylyl group and naphthyl group. Examples of aralkyl group having 7 to 18 carbon atoms include benzyl group, phenethyl group and naphthylmethyl group.
In addition, the hydrocarbon group having 1 to 18 carbon atoms may contain at least one oxygen atom and/or at least one sulfur atom. That is to say, the above-mentioned hydrocarbon group may contain at least one ether group, or at least one thioether group, or both said groups in its main chain. Examples of the aforesaid hydrocarbon group include hexyloxymethyl group, hexyloxyethyl group, octyloxymethyl group, octyloxyethyl group, dodecyloxymethyl group, dodecyloxyethyl group, hexadecyloxymethyl group, hexadecyloxyethyl group, hexylthiomethyl group, hexylthioethyl group, octylthiomethyl group, octylthioethyl group, dodecylthiomethyl group, dodecylthioethyl group, hexadecylthiomethyl group and hexadecylthioethyl group.
The R7 and R8 may be the same as or different from each other, but are not simultaneously hydrogen atom.
Examples of the acidic phosphate ester among the compound represented by the general formula (III) include the compound having the structure represented by the general formula (III-a)
Figure 00110001
wherein R7 and R8 are each as previously defined.
Examples of the acidic phosphate ester represented by the general formula (III-a ) include mono- or di-hexylhydrogen phosphate, mono- or di-octylhydrogen phosphate, mono- or di-dodecylhydrogen phosphate, mono- or di-hexadecylhydrogen phosphate, mono- or di-(hexylthioethyl)hydrogen phosphate, mono- or di-(octylthioethyl)hydrogen phosphate, mono- or di-(dodecylthioethyl)hydrogen phosphate, mono- or di-(hexadecylthioethyl)hydrogen phosphate, mono- or di-octenylhydrogen phosphate, mono- or di-oleylhydrogen phosphate, mono- or di-cyclohexylhydroqen phosphate, mono- or di-phenylhydrogen phosphate, mono- or di-toluylhydrogen phosphate, mono- or di-benzylhydrogen phosphate, mono- or di-phenetylhydrogen phosphate and the like.
Examples of the phosphite ester among the compound represented by the general formula (II) include the acidic phosphite ester having the structure represented by the general formula (III-b) or (III-c):
Figure 00120001
wherein R7 and R8 are each as previously defined.
Examples of the acidic phosphite ester represented by the general formula (III-b) or (III-c) include mono- or di-hexylhydrogen phosphite, mono- or di-octylhydrogen phosphite, mono- or di-dodecylhydrogen phosphite, mono- or di-hexadecylhydrogen phosphite, mono- or di-(hexylthioethyl)hydrogen phosphite, mono- or di-(octylthioethyl)hydrogen phosphite, mono- or di-(dodecylthioethyl)hydrogen phosphite, mono- or di-(hexadecylthioethyl)hydrogen phosphite, mono- or di-octenylhydrogen phosphite, mono- or di-oleylhydrogen phosphite, mono- or di-cyclohexylhydrogen phosphite, mono- or di-phenylhydrogen phosphite, mono- or di-toluylhydrogen phosphite, mono- or di-benzylhydrogen phosphite, mono- or di-phenetylhydrogen phosphite and the like.
On the one hand, the above-mentioned active sulfur base compound to be used as the component (B) is not specifically limited, but may be properly and optionally selected for use from among the well known active sulfur base compounds that have heretofore been used as an extreme pressure agent, an anti-wear agent, a friction modifier and the like, for instance, a sulfurized fat and oil, that is, a sulfurized animal oil, vegetable oil or synthetic oil; an olefin mono- or poly-sulfide; a dihydrocarbyl mono- or poly-sulfide ; a sulfurized mineral oil; a thiocarbamate; thioterpene; and dialkylthiodipropionate.
Examples of the sulfurized fat and oil include sulfurized lard, sulfurized rapeseed oil, sulfurized castor oil, sulfurized soybean oil, sulfurized bran oil, disulfurized fatty acid such as sulfurized oleic acid and sulfurized ester such as sulfurized methyl oleate. Examples of the aforesaid olefin mono- or poly- sulfide include a product which is produced by reacting an olefin having 3 to 20 carbon atoms, preferably propylene, isobutene or diisobutene or any of its dimer, trimer and tetramer with a sulfurizing agent specifically exemplified by sulfur, sulfur chloride and other sulfur halogenides.
The above-cited dihydrocarbyl mono- or poly-sulfide is a compound represented by the general formula (IV): R9―Sx―R10 wherein R9 and R10 are each an alkyl group having 1 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, an alkylaryl group having 7 to 20 carbon atoms, or an aralkyl group having 7 to 20 carbon atoms, and may be the same as or different from each other, and x is a real number from 1 to 8, more specifically a rational number.
Specific examples of the R9 and R10 in the foregoing general formula (IV) include methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, sec-butyl group, tert-butyl group, each pentyl group, each hexyl group, each heptyl group, each octyl group, each nonyl group, each decyl group, each dodecyl group, cyclohexyl group, cyclooctyl group, phenyl group, naphthyl group, tolyl group, xylyl group, benzyl group and phenethyl group.
The above-cited dihydrocarbyl mono- or poly-sulfide is preferably exemplified by dibenzyl mono- or poly-sulfide, di-tert-nonyl mono- or poly-sulfide and didodecyl mono- or poly-sulfide.
Examples of the thiocarbamate are zinc dithiocarbamate, etc., those of the thioterpene are a reaction product between phosphorus pentasulfide and pinene, and the like, and those of the dialkylthio-dipropionate are dilaurylthio-dipropionate, distearylthio-dipropionate, and the like.
In the present invention, the active phosphorus base compound or the active sulfur base compound as the component (B) may be used alone or in combination with at least one other species. The blending amount of the component (B) is not specifically limited provided that said amount falls within the scope of the amount usually employed in a transmission lubricating oil for automobiles.
In the case where the active phosphorus base compound is used as the component (B) in the present invention, the above-mentioned boron-containing imide base dispersant as the component (A) and the active phosphorus base compound as the component (B) can be blended in the base oil after mixing in advance both the components as desired, and then subjecting the resultant mixture to heating treatment at a temperature in the range of 120 to 150°C for at least 5 hours. It is acceptable in this case to mix the component (A) in part and the active phosphorus base compound as the component (B) in part that are to be blended, subject the resultant mixture to heating treatment, and subsequently mix into the base oil, the heated mixture and the remainders of the component (A) and the component (B). Alternatively, it is also acceptable in this case to mix the component (A) in whole and the component (B) in whole that are to be blended, subject the resultant mixture to heating treatment, and subsequently mix the heated mixture into the base oil.
In more detail, the above-mentioned method for heating treatment of both the components comprises the steps of mixing the component (A) and the component (B) at a prescribed ratio, agitating the resultant mixture at a temperature in the range of approximately 40 to 70°C for approximately 10 minutes to 3 hours to carry out homogenization treatment, and subsequently subjecting the resultant homogenizedly treated mixture to heating treatment at a temperature in the range of 120 to 150°C for at least 5 hours, preferably for 5 to 24 hours, wherein said heating treatment may be put into practice under standing still or under stirring.
The lubricating oil composition according to the present invention may be properly and optionally incorporated at need with any of other well known additives, which are exemplified by antioxidants of phenol base, amine base and zinc dithiophosphate base; detergents / dispersants of imide base, ester base, benzylamine base, phenate base and salicylate base; friction modifiers of amide base, ester base and fatty acid base;rust preventive agents of metal sulfonate base, succinate ester base and sorbitan ester base; metal deactivators of bentotriazole base and thiadiazole base; and anti-foam agents of silicone base; and the like.
The lubricating oil composition according to the present invention enhances peeling resistant durability for a friction material, especially a cellulose base wet friction material without impairing the wear resistance or scoring resistance of a steel material element, and thus is well suited for use in a cellulose base friction material for a starting and running device and a transmission clutch that are employed in an automatic transmission of an automobile.
In the following, the present invention will be described in further detail with reference to comparative examples and working examples, which however shall never limit the present invention thereto.
The performances of the lubricating oil composition according to the present invention were evaluated in accordance with the procedures as described hereunder.
〈 weight loss of filter paper〉
Filter paper immersion test was carried out by placing 75mℓ of a sample oil in a 100 mℓ wide mouthed vessel, immersing two sheets of # 51 B filter paper manufactured by ADVA NTEC Co. Ltd. (measuring 20 × 80 mm, made of pure cellulose) in the sample oil, covering the vessel with a lid made of aluminum foil, and heating the vessel in a thermostat (air bath ) at 175°C for 40 hours under standing still condition. The filter paper was weighed before and after the test, and the weight loss of the filter paper was calculated by the following formula, in which the more the weight loss thereof, the severer the attack to the cellulose as the filter paper material. weight loss (%) = {(weight before test-weight after test) /weight before test} × 100
In the following, some description will be given of the various additives that were used in the above-mentioned tests.
  • Additive (1); boronated polybutenyl succinimide (manufactured by Lubrizol Co., Ltd. under the trade name "Lz935") having a weight-average molecular weight of 950, a B content of 1.98% by weight, an N content of 2.05% by weight, a total acid number of 7.3 mg KOH/g, a base number of 65.8 mg KOH/g and a B/N ratio by weight of 0.97
  • Additive (2); boronated polybutenyl succinimide (manufactured by Exxon Chemical Co., Ltd. under the trade name "ECA 5025") having a weight-average molecular weight of 950, a B content of 0.33% by weight, an N content of 1.35% by weight, a total acid number of 6.5 mg KOH/g, a base number of 32.5 mg KOH/g and a B/N ratio by weight of 0.24
  • Additive (3); boronated polybutenyl succinimide (manufactured by Ethyl Japan Co., Ltd. under the trade name "EOA 8015" ) having a weight-average molecular weight of 950, a B content of 1.15% by weight, an N content of 1.46% by weight, a total acid number of 0.65 mg KOH/g, a base number of 45.2 mg KOH/g and a B/N ratio by weight of 0.79
  • Additive (4); mono (2-ethylhexyl) hydrogenphosphate (manufactured by Sakai Chemical Industry Co.,Ltd.) having a P content of 12% by weight and a total acid number of 320 mg KOH/g
  • Additive (5); phosphorus/ sulfurized terpene ( manufactured by Ethyl Japan Co., Ltd.) having an S content of 13% by weight, a P content of 4.8% by weight and a total acid number of 6.6 mg KOH/g
  • Additive (6); polybutenyl succinimide ( manufactured by Lubrizol Co., Ltd. under the trade name "Lz6406") having an N content of 1.76% by weight, a total acid number of 1.5 mg KOH/g and a base number of 46.8 mg KOH/g
  • Additive (7); polybutenyl succinimide ( manufactured by Oronite Japan Ltd. under the trade name "OLOA 373") having an N content of 1.05% by weight, a total acid number of 4.5 mg KOH/g and a base number of 20.1 mg KOH/g
    • Examples 1 to 5 and Comparative Examples 1 to 6
    Various lubricating oil compositions were each prepared by blending at least one of the additives 1 to 7, the blending amounts of which are shown in Table 1 with a 150 neutral oil as a paraffin base mineral oil (manufactured by Idemitsu Kosan Co., Ltd.) having kinematic viscosity of 30.7 mm2 /sec at 40°C and 5.25 mm2/sec at 100°C and a viscosity index of 104, and further blending therewith, 0.5% by weight of 4, 4'-methylenebis(2, 6-di-tert-butylphenol) { manufactured by Ethyl Japan Co.,Ltd.}, 0.5% by weight of 4, 4'-dioctylphenylamine { manufactured by Kawaguchi Chemical Co., Ltd.}, 0.3% by weight of oleic acid monoglyceride { manufactured by Kao Corporation }, 0.02% by weight of 1, 2, 3-benzotriazole { manufactured by Johoku Chemical Co., Ltd.) and 0.002% by weight of polydimethylsiloxane { manufactured by Shin-Etsu Chemical Co., Ltd.} each based on the whole amount of the lubricating oil composition in question. Thus, the above-described tests were carried out, and evaluations were made of the performances of each of the lubricating oil compositions thus prepared.
    The results of evaluating the performances of the various lubricating oil compositions are given in Table 1.
    Example
    1 2 3 4 5
    Component(A) (wt%) Additive 1 0.5 1.0 - - 0.5
    Additive 2 - - 2.0 - -
    Additive 3 - - - 0.7 -
    Component(B) (wt%) Additive 4 0.2 0.2 0.2 0.2 -
    Additive 5 - - - - 1.0
    Other component (wt%) Additive 6 - - - - -
    Additive 7 - - - - -
    Boron content in oil derived from component (A) in lubricating oil composition (wt ppm) 100 200 66 80 100
    Nitrogen content in oil derived from component (A) or other components in lubricating oil composition (wt ppm) 103 205 270 102 103
    Weight loss of filter paper (wt%) 10.6 5.8 7.4 12.6 6.4
    Comparative Example
    1 2 3 4 5 6
    Component(A) (wt%) Additive 1 - - 0.3 - - -
    Additive 2 - - - - - -
    Additive 3 - - - 0.5 - -
    Component(B) (wt%) Additive 4 0.2 - 0.2 0.2 0.2 0.2
    Additive 5 - 1.0 - - - -
    Other component (wt%) Additive 6 - - - - 2.0 -
    Additive 7 - - - - - 2.0
    Boron content in oil derived from component (A) in lubricating oil composition (wt ppm) 0 0 59 58 0 0
    Nitrogen content in oil derived from component (A) or other components in lubricating oil composition (wt ppm) 0 0 62 73 350 210
    Weight loss of filter paper (wt%) 45.6 24.6 29.5 24.7 17.8 28.6

    Claims (8)

    1. A lubricating oil composition for cellulose base wet friction material which comprises a base oil blended with (A) a boron-containing imide base dispersant having a weight-average molecular weight in the range of 500 to 3000 and having a ratio by weight of boron to nitrogen (B/N) in the range of 0.1 to 1.5 in such a blending amount that the boron content and the nitrogen content each derived from the component (A) are made to be at least 60 ppm by weight and at least 100 ppm by weight, respectively based on said base oil.
    2. The lubricating oil composition according to Claim 1, wherein the boron-containing imide base dispersant as the component (A) has a ratio by weight of boron to nitrogen (B/N) in the range of 0.2 to 1.0.
    3. The lubricating oil composition according to Claim 1, wherein the boron-containing imide base dispersant as the component (A) is produced by treating polyalkenyl succinimide with a boron compound.
    4. The lubricating oil composition according to Claim 3, wherein the polyalkenyl succinimide is polybutenyl succinimide.
    5. The lubricating oil composition according to Claim 1, wherein the boron content derived from the component (A) is in the range of 60 to 300ppm based on said base oil.
    6. The lubricating oil composition according to Claim 1, wherein the nitrogen content derived from the component (A) is in the range of 100 to 1200 ppm based on said bade oil.
    7. The lubricating oil composition according to Claim 1, which further comprises (B) at least one member selected from the group consisting of an active phosphorus base compound and an active sulfur base compound.
    8. The lubricating oil composition according to Claim 7, wherein the active phosphorus base compound is at least one member selected from the group consisting of the acidic phosphate esters and phosphite esters represented by the general formula (III):
      Figure 00230001
      wherein A is hydrogen atom or hydroxyl group; k is 0 or 1 with the proviso that A is hydroxyl group when k is 0, and A is hydrogen atom or hydroxyl group when k is 1; and R7 and R8 are each hydrogen atom or a hydrocarbon group which has 1 to 18 carbon atoms, and which may contain at least one member selected from the group consisting of oxygen atom and sulfur atom with the proviso that R7 and R8 may be the same as or different from each other, but are not simultaneously hydrogen atom.
    EP00111046A 1999-06-04 2000-05-31 Lubricating oil composition for cellulose base wet friction material Withdrawn EP1057882A1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    JP11157742A JP2000345182A (en) 1999-06-04 1999-06-04 Lubricating oil composition for cellulosic wet friction material
    JP15774299 1999-06-04

    Publications (1)

    Publication Number Publication Date
    EP1057882A1 true EP1057882A1 (en) 2000-12-06

    Family

    ID=15656369

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP00111046A Withdrawn EP1057882A1 (en) 1999-06-04 2000-05-31 Lubricating oil composition for cellulose base wet friction material

    Country Status (3)

    Country Link
    US (1) US20020165102A1 (en)
    EP (1) EP1057882A1 (en)
    JP (1) JP2000345182A (en)

    Cited By (1)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    GB2444357A (en) * 2006-11-30 2008-06-04 Afton Chemical Corp Lubricating oil compositions

    Families Citing this family (23)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    JP3599231B2 (en) * 1999-06-04 2004-12-08 出光興産株式会社 Fluid for traction drive
    JP4571776B2 (en) * 2002-11-05 2010-10-27 Ｊｘ日鉱日石エネルギー株式会社 Lubricating oil composition
    JP4563114B2 (en) * 2004-08-30 2010-10-13 出光興産株式会社 Additive for lubricant
    JP4677359B2 (en) * 2005-03-23 2011-04-27 アフトン・ケミカル・コーポレーション Lubricating composition
    US7531486B2 (en) * 2005-03-31 2009-05-12 Exxonmobil Chemical Patents Inc. Additive system for lubricant
    US8034754B2 (en) * 2005-03-31 2011-10-11 The Lubrizol Corporation Fluids for enhanced gear protection
    US20080139422A1 (en) * 2006-12-06 2008-06-12 Loper John T Lubricating Composition
    US20080139425A1 (en) * 2006-12-11 2008-06-12 Hutchison David A Lubricating composition
    US20080139427A1 (en) * 2006-12-11 2008-06-12 Hutchison David A Lubricating composition
    US20080139428A1 (en) * 2006-12-11 2008-06-12 Hutchison David A Lubricating composition
    US20080287328A1 (en) * 2007-05-16 2008-11-20 Loper John T Lubricating composition
    SG183804A1 (en) * 2010-02-19 2012-10-30 Infineum Int Ltd Wet friction clutch-lubricant systems providing high dynamic coefficients of friction through the use of sodium detergents
    US9365794B2 (en) * 2010-02-19 2016-06-14 Infineum International Limited Wet friction clutch—lubricant systems providing high dynamic coefficients of friction through the use of borated detergents
    CN104870621A (en) * 2012-12-19 2015-08-26 出光兴产株式会社 lubricating oil composition
    JP6073748B2 (en) * 2013-06-10 2017-02-01 東燃ゼネラル石油株式会社 Lubricating oil composition
    JP2015025114A (en) * 2013-06-19 2015-02-05 コスモ石油ルブリカンツ株式会社 Hydraulic oil composition
    CN107532023B (en) * 2015-07-17 2021-07-13 惠普深蓝有限责任公司 electrostatic ink composition
    US12146115B2 (en) 2022-12-20 2024-11-19 Afton Chemical Corporation Low ash lubricating compositions for controlling steel corrosion
    US12195695B2 (en) 2023-05-10 2025-01-14 Afton Chemical Corporation Lubricating oil compositions for improving low-speed pre-ignition
    US12291688B1 (en) 2023-12-12 2025-05-06 Afton Chemical Corporation Silicon-containing compounds for lubricants
    US12565625B2 (en) 2023-12-18 2026-03-03 Afton Chemical Corporation Thiophosphate esters as antiwear additives for lubricants
    US12378493B1 (en) 2024-03-27 2025-08-05 Afton Chemical Corporation Lubricating composition for enhanced fuel economy
    US12460150B1 (en) 2024-09-27 2025-11-04 Afton Chemical Corporation Low-ash lubricating compositions

    Citations (8)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    US4428849A (en) * 1980-08-25 1984-01-31 Exxon Research & Engineering Co. Lubricating oil with improved diesel dispersancy
    EP0136185A2 (en) * 1983-09-29 1985-04-03 Edwin Cooper, Inc. Process for boronating dispersants, boronated dispersants and fluid compositions containing the same
    US4634543A (en) * 1981-09-10 1987-01-06 Idemitsu Kosan Company Limited Shock absorber fluid composition and shock absorber containing said composition
    EP0562172A1 (en) * 1991-12-12 1993-09-29 Idemitsu Kosan Company Limited Engine oil composition
    EP0628623A1 (en) * 1993-05-25 1994-12-14 Idemitsu Kosan Company Limited Lubricant composition for limited slip differential of car
    EP0646639A1 (en) * 1993-08-20 1995-04-05 The Lubrizol Corporation Lubricating compositions
    EP0695799A2 (en) * 1994-08-03 1996-02-07 The Lubrizol Corporation Combination of a sulfer compound and specific phosphorus compounds and their use in lubricating compositions, concentrates and greases
    DE4438456A1 (en) * 1994-10-28 1996-05-02 Deutsche Forsch Luft Raumfahrt Friction unit

    Patent Citations (8)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    US4428849A (en) * 1980-08-25 1984-01-31 Exxon Research & Engineering Co. Lubricating oil with improved diesel dispersancy
    US4634543A (en) * 1981-09-10 1987-01-06 Idemitsu Kosan Company Limited Shock absorber fluid composition and shock absorber containing said composition
    EP0136185A2 (en) * 1983-09-29 1985-04-03 Edwin Cooper, Inc. Process for boronating dispersants, boronated dispersants and fluid compositions containing the same
    EP0562172A1 (en) * 1991-12-12 1993-09-29 Idemitsu Kosan Company Limited Engine oil composition
    EP0628623A1 (en) * 1993-05-25 1994-12-14 Idemitsu Kosan Company Limited Lubricant composition for limited slip differential of car
    EP0646639A1 (en) * 1993-08-20 1995-04-05 The Lubrizol Corporation Lubricating compositions
    EP0695799A2 (en) * 1994-08-03 1996-02-07 The Lubrizol Corporation Combination of a sulfer compound and specific phosphorus compounds and their use in lubricating compositions, concentrates and greases
    DE4438456A1 (en) * 1994-10-28 1996-05-02 Deutsche Forsch Luft Raumfahrt Friction unit

    Cited By (2)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    GB2444357A (en) * 2006-11-30 2008-06-04 Afton Chemical Corp Lubricating oil compositions
    GB2444357B (en) * 2006-11-30 2009-03-11 Afton Chemical Corp Lubricating oil compositions having improved corrosion and seal protection properties

    Also Published As

    Publication number Publication date
    JP2000345182A (en) 2000-12-12
    US20020165102A1 (en) 2002-11-07

    Similar Documents

    Publication Publication Date Title
    US20020165102A1 (en) Lubricating oil composition for cellulose base wet friction material
    EP1057884B1 (en) Traction drive fluid
    US4959168A (en) Sulfurized compositions, and additive concentrates and lubricating oils containing same
    EP0394359B1 (en) Mixtures of partial fatty acid esters of polyhydric alcohols and sulfurized compositions, and use as lubricant additives
    CA2495199C (en) Synergistic organoborate compositions and lubricating compositions containing same
    GB2221474A (en) Lubricating oil compositions containing salts of dithiophosphoric acid
    JP2002544372A (en) High boron formulations for continuously variable transmission fluids
    US4960530A (en) Lubricating oil composition
    JP5941316B2 (en) Lubricating oil composition
    EP0434464A1 (en) Transition-metal free Lubricant
    JPH10183154A (en) Lubricating oil composition
    US5254272A (en) Lubricant compositions with metal-free antiwear or load-carrying additives and amino succinate esters
    WO1999038939A1 (en) Novel additive compositions
    JPWO1995009904A1 (en) Lubricating oil composition for high speed gears
    GB2267098A (en) Lubricants with enhanced low temperature properties
    CA1325420C (en) Lubricating oil composition
    EP0556404A1 (en) Lubricating oil composition
    EP0493928A1 (en) Lubricating oil compositions, concentrates and the use thereof
    US4960528A (en) Lubricating oil composition
    EP0516461B1 (en) Lubricating oil compositions and concentrates and the use thereof
    US5028345A (en) Lubricating oil composition
    JP4307575B2 (en) Lubricating oil composition
    JPWO2005035701A1 (en) Lubricating oil additive and lubricating oil composition
    JP4044225B2 (en) Traction drive fluid
    JP4044224B2 (en) Additive for lubricant

    Legal Events

    Date Code Title Description
    PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

    Free format text: ORIGINAL CODE: 0009012

    AK Designated contracting states

    Kind code of ref document: A1

    Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

    AX Request for extension of the european patent

    Free format text: AL;LT;LV;MK;RO;SI

    17P Request for examination filed

    Effective date: 20010514

    AKX Designation fees paid

    Free format text: AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

    17Q First examination report despatched

    Effective date: 20050428

    STAA Information on the status of an ep patent application or granted ep patent

    Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

    18D Application deemed to be withdrawn

    Effective date: 20091201