EP0340302A1 - Composition d'une huile lubrifiante pour engrenages - Google Patents

Composition d'une huile lubrifiante pour engrenages Download PDF

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Publication number
EP0340302A1
EP0340302A1 EP87906604A EP87906604A EP0340302A1 EP 0340302 A1 EP0340302 A1 EP 0340302A1 EP 87906604 A EP87906604 A EP 87906604A EP 87906604 A EP87906604 A EP 87906604A EP 0340302 A1 EP0340302 A1 EP 0340302A1
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EP
European Patent Office
Prior art keywords
gear
oil
oils
ester
carbon atoms
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.)
Ceased
Application number
EP87906604A
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German (de)
English (en)
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EP0340302A4 (fr
Inventor
Kuniaki Suzuki
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.)
Tonen General Sekiyu KK
Original Assignee
Tonen Corp
Toa Nenryo Kogyyo KK
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Publication date
Application filed by Tonen Corp, Toa Nenryo Kogyyo KK filed Critical Tonen Corp
Publication of EP0340302A4 publication Critical patent/EP0340302A4/fr
Publication of EP0340302A1 publication Critical patent/EP0340302A1/fr
Ceased legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M107/00—Lubricating compositions characterised by the base-material being a macromolecular compound
    • C10M107/20—Lubricating compositions characterised by the base-material being a macromolecular compound containing oxygen
    • C10M107/30—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M107/32—Condensation polymers of aldehydes or ketones; Polyesters; Polyethers
    • C10M107/34—Polyoxyalkylenes
    • 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
    • C10M105/00—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound
    • C10M105/08—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound containing oxygen
    • C10M105/32—Esters
    • C10M105/36—Esters of polycarboxylic acids
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M105/00—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound
    • C10M105/08—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound containing oxygen
    • C10M105/32—Esters
    • C10M105/38—Esters of polyhydroxy 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
    • C10M111/00—Lubrication compositions characterised by the base-material being a mixture of two or more compounds covered by more than one of the main groups C10M101/00 - C10M109/00, each of these compounds being essential
    • C10M111/04—Lubrication compositions characterised by the base-material being a mixture of two or more compounds covered by more than one of the main groups C10M101/00 - C10M109/00, each of these compounds being essential at least one of them being a macromolecular organic 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
    • C10M2207/28—Esters
    • C10M2207/281—Esters of (cyclo)aliphatic monocarboxylic acids
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/28—Esters
    • C10M2207/282—Esters of (cyclo)aliphatic oolycarboxylic acids
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/28—Esters
    • C10M2207/282—Esters of (cyclo)aliphatic oolycarboxylic acids
    • C10M2207/2825—Esters of (cyclo)aliphatic oolycarboxylic acids used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/28—Esters
    • C10M2207/283—Esters of polyhydroxy 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
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/28—Esters
    • C10M2207/283—Esters of polyhydroxy compounds
    • C10M2207/2835—Esters of polyhydroxy compounds used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/28—Esters
    • C10M2207/285—Esters of aromatic polycarboxylic acids
    • C10M2207/2855—Esters of aromatic polycarboxylic acids used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/28—Esters
    • C10M2207/286—Esters of polymerised unsaturated acids
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/28—Esters
    • C10M2207/34—Esters having a hydrocarbon substituent of thirty or more carbon atoms, e.g. substituted succinic acid derivatives
    • 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
    • C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
    • C10M2209/10—Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2209/103—Polyethers, i.e. containing di- or higher polyoxyalkylene groups
    • C10M2209/104—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of alkylene oxides containing two carbon atoms 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
    • C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
    • C10M2209/10—Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2209/103—Polyethers, i.e. containing di- or higher polyoxyalkylene groups
    • C10M2209/105—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of alkylene oxides containing three carbon atoms 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
    • C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
    • C10M2209/10—Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2209/103—Polyethers, i.e. containing di- or higher polyoxyalkylene groups
    • C10M2209/106—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of alkylene oxides containing four carbon atoms 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
    • C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
    • C10M2209/10—Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2209/103—Polyethers, i.e. containing di- or higher polyoxyalkylene groups
    • C10M2209/107—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of two or more specified different alkylene oxides covered by groups C10M2209/104 - C10M2209/106
    • 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
    • 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
    • C10M2223/041—Triaryl phosphates
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2020/00—Specified physical or chemical properties or characteristics, i.e. function, of component of lubricating compositions
    • C10N2020/01—Physico-chemical properties
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/02—Bearings
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/04—Oil-bath; Gear-boxes; Automatic transmissions; Traction drives
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • 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
    • 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
    • C10N2040/08—Hydraulic fluids, e.g. brake-fluids

Definitions

  • This invention relates to a gear lubricant oil composition
  • a gear lubricant oil composition comprising polyoxyalkylene glycol ester(s) (also simply called polyglycol ester(s)) as a base oil. More particularly, it relates to a gear oil composition whose wear resistance properties and oxidation stability are improved by incorporating specific polyoxyalkylene glycol ester(s) as a base oil.
  • gears using gears have been used in a variety of industrial fields because they steadily transmit power to a driven device. These gear devices are broadly classified, depending on their uses, into industrial devices and those for use in automobiles. An appropriate gear oil suitable for the particular purpose is used in each case.
  • a gear oil is a lubricant oil that reduces friction between at least one pair of gears transmitting power from a driving device, e.g., a motor, to a driven one, thereby decreasing power loss and inhibiting damage to the gears, thus prolonging the life span of the gears.
  • mineral oils are exclusively used as the base oils of gear oils.
  • Gear oils further contain about 0.1 to 10 % by weight of various additives such as antioxidants, extreme pressure agents, rust preventives and anti-foaming agents.
  • gear oils mainly employ base oils comprising mineral oils.
  • base oils comprising mineral oils.
  • a gear oil composition comprising such a base oil, as well as specific additives such as extreme-­pressure agents or antioxidants, is usually used.
  • gear oils is the lubricant oil composition disclosed in Japanese Patent Laid-Open No. 59-75995, which proposes improving the wear resistance, extreme-pressure qualities, and friction properties of a lubricant oil, by introducing an organo molybdenum compound of a specific structural formula and an acid phosphite ester or an acid phosphate ester as essential ingredients into, for example, a mineral oil having a lubricant viscosity.
  • the mineral oil used is a refined mineral oil which is obtained by, for example, distilling a naphthene crude oil in vacuo to give a crude lubricant oil, and removing impurities such as unsaturated hydrocarbons or metallic components therefrom by solvent-refining or hydrogenation.
  • synthetic lubricant oils comprising, for example, esters, poly- ⁇ -olefins, and polyglycol oils.
  • a synthetic lubricant oil of the desired lubricant properties may be obtained by controlling the synthesis conditions.
  • synthetic lubricant oils can exhibit better anti-friction and anti-oxidation properties than mineral oils.
  • polyglycol oils Japanese Patent Publication No. 49-1339 has disclosed a lubricant which is prepared by adding, for example, an aromatic amine, an aliphatic phenol, and an organic phosphate, to a base oil. This lubricant composition has improved oxidation stability, load resistance, and rust resistance, at high working temperatures.
  • Japanese Patent Laid-Open No. 49-18821 discloses a polyglycol ester which is obtained by esterifying polyethylene glycol with an unsaturated carboxylic acid useful as a surfactant or a stain remover for fabrics.
  • gear oils comprising mineral oils as base oils have an overwhelming share in the machine industries.
  • gear oils which comprise a mineral base oil containing additives compensating for the shortcomings of the mineral base oil will not satisfy the various requirements of future markets.
  • a gear oil comprising specific polyoxyalkylene glycol ester(s) as a base oil exhibits not only a remarkably improved wear resistance and oxidation stability, even at high temperatures, but also improved viscosity properties at low temperatures.
  • this invention relates to a gear lubricant oil composition characterized by comprising polyoxyalkylene glycol ester(s) as a base oil in which the polyoxyalkylene glycol ester(s) are ester(s) obtained by reacting polymer(s) that are obtainable by ring opening (co)polymerization of one or more alkylene oxides selected from the group of alkylene oxide(s) having two to four carbon atoms with carboxylic acid(s) having one to ten carbon atoms.
  • the polyglycol ester(s) of this invention are ester(s) of polyglycol(s) and carboxylic acid(s).
  • the polyglycols are polymers obtained by ring-opening (co)polymerization of one or more alkylene oxides selected from the group of alkylene oxides having two to four carbon atoms, i.e., ethylene oxide, propylene oxide, butylene oxide, and isobutylene oxide.
  • the polyglycols include, for example, polyethylene glycol, polypropylene glycol, polybutylene glycol, polyisobutylene glycol, a ring-opening copolymer of ethylene oxide and propylene oxide, and a ring-opening copolymer of propylene oxide and butylene oxide.
  • the average molecular weight of these polyalkylene oxides is about 800 to 4000.
  • a polypropylene glycol of an average molecular weight of 1000 to 3000 may be used in this invention.
  • the carboxylic acid(s) used in this invention are those having one to ten carbon atoms. Any straight-chain, branched, or cyclic carboxylic acids may be used, unless they contain unsaturated bond(s). Examples include formic, acetic, propionic, -butyric, isobutyric, valeric, trimethylacetic, caproic, enanthic, caprylic, pelargonic, capric, cyclohexylcarboxylic, and methylhexylcarboxylic acids. Among these carboxylic acids, those having five to ten carbon atoms are particularly preferred.
  • the polyoxyalkylene glycol esters have a viscosity of 5 mm2/s to 40 mm2/s at 100°C.
  • a polyoxyalkylene glycol ester having a viscosity of less than 5 mm2/s at 100°C is undesirable, because of its poor wear resistance and low oxidation stability at high temperatures.
  • one having a viscosity of more than 40 mm2/s is also undesirable, since its poor flowability at low temperatures results in insufficient lubricating effects.
  • a gear oil that is to be used in a machine in a cold area is particularly required to have satisfactory viscosities at low temperatures.
  • a particularly preferred base oil for the gear oil of this invention comprises polypropylene glycol ester or polyethylene glycol ester having a viscosity of 8 mm2/s to 25 mm2/s at 100°C and 10 x 104 mpa.s to 60 x 104 mpa.s at -40°C.
  • the polyoxyalkylene glycol ester(s) of this invention can be produced by any known method. Namely, a polyglycol and a carboxylic acid may be esterified under any known and conventional esterification condition. The polyglycol is reacted with a nearly equi-molar or slight excess of carboxylic acid, i.e., at a molar ratio of 1 : 1 to 1 : 1.5. These reactants are introduced into a reactor and allowed to react in it in the presence of a catalyst at about 80 to 150°C, preferably about 100°C to 120°C, under a pressure of about 1 to 5 atm, preferably about 1 to 3 atm.
  • Either a continuous or batch-type reactor may be used, although the latter is preferred from the operational standpoint.
  • An acid catalyst such as phosphoric acid may be used.
  • An inert gas such as nitrogen gas is passed through the reactor to inhibit the oxidation of the reaction product.
  • Alkylbenzene(s) such as benzene or toluene are used as solvent(s) to prevent the water formed during the reaction from returning to the reactor.
  • heating is terminated and any excess acid is neutralized with an alkali such as caustic soda.
  • the reaction product is distilled in vacuo and the solvent(s) and excess starting materials are distilled off to obtain the polyglycol ester.
  • Polypropylene glycol may be prepared by polymerizing propylene oxide in the presence of a metal alcoholate as a catalyst, and water or an alcohol as an initiator, under a pressure of 1 to 10 atm at 100 to 150°C.
  • polypropylene glycol ester may be used alone.
  • a base oil that is a mixture of a polypropylene glycol ester and a polyethylene glycol ester, or a polybutylene glycol ester, may be used. It is very effective to use as a base oil comprising such a mixture of polyalkylene glycol esters to achieve the desired viscosity properties as defined above.
  • a polyoxyalkylene glycol ester base oil having the appropriate viscosity properties can be readily obtained by blending a polypropylene glycol ester, which has a high molecular weight and high viscosity at low temperatures, with a polyethylene glycol ester, which has a relatively low molecular weight and is highly flowable at low temperatures.
  • the polyoxyalkylene glycol ester of this invention may contain other esters. Examples of these esters are monoesters, diesters, and polyesters, i.e., those having three or more ester bonds.
  • the monoesters include aliphatic esters having 15 or more carbon atoms: the diesters include those formed by esterifying aliphatic dibasic acids having 4 to 14 carbon atoms with monoalcohols having 4 to 14 carbon atoms; and the polyesters include triesters formed from trihydric alcohols having 4 to 13 carbon atoms and fatty acids having 3 to 13 carbon atoms, and tetraesters formed from tetrahydric alcohols having 5 to 10 carbon atoms and fatty acids having 5 to 10 carbon atoms.
  • esters include diesters such as diisodecyl adipate, dioctyl sebacate, and dioctyl azelate, and triesters such as trimethylolpropane triheptanoate, and trimethylolpropane trioctanoate.
  • diesters such as diisodecyl adipate, dioctyl sebacate, and dioctyl azelate
  • triesters such as trimethylolpropane triheptanoate, and trimethylolpropane trioctanoate.
  • these esters enhance the oxidation stability of polyalkylene glycol esters.
  • the addition of about 10 to 50 % by weight, preferably 20 to 40 % by weight, of the ester(s) can significantly enhance the lubricant properties of a gear oil comprising polyalkylene glycol ester(s), of low viscosity, i.e., 5 to 20 mm2/s at 100
  • the polyglycol ester synthetic lubricant oil of this invention can be used as a gear oil. It exhibits remarkable properties, particularly when used as an industrial gear oil. Namely, it can be advantageously used as a gear oil at high temperatures, high loads, and high rotation speeds, or as a gear oil for machines used under changing temperature conditions, i.e., varying widely from low to high temperatures.
  • the polyglycol ester base oil may additionally contain a suitable amount of conventional additives, depending on its use.
  • Suitable additives include antioxidants such as aromatic amines (0.3 to 5 % by weight); extreme pressure agents such as tricresyl phosphate (0.3 to 13 % by weight); metal inactivators (0.01 to 3 % by weight); rust preventtives (0.05 to 2 % by weight); oiliness improvers (0.01 to 3 % by weight); and anti-foaming agents (0.0005 to 0.02 % by weight). These additives may be added in a total amount of 3 to 15 % by weight and, unlike a mineral base oil, no viscosity index additive is required.
  • antioxidants such as aromatic amines (0.3 to 5 % by weight); extreme pressure agents such as tricresyl phosphate (0.3 to 13 % by weight); metal inactivators (0.01 to 3 % by weight); rust preventtives (0.05 to 2 % by weight); oiliness improvers (0.01 to 3 % by weight); and anti-foaming agents (0.0005 to 0.02 % by weight).
  • antioxidants such
  • the polyoxyalkylene glycol ester(s) of this invention are obtained by esterifying with carboxylic acid(s) the terminal alcohol group of polyethers that are obtained by polymerizing oxyalkylene through a ring-opening mechanism, the polyoxyalkylene glycol ester(s) of this invention have high oxidation stability and flowability, even at high temperatures. Further, they can act as viscosity index improvers since they have specific viscosities at both high and low temperatures. Unlike polyoxyalkylene glycol(s), they contain no terminal hydroxyl group. Thus their oxidation stability is not adversely affected, even at high temperatures. Furthermore, they exhibit excellent compatibility with antiwear agents such as tricresyl phosphate, which results in highly preferred lubricant properties for use as gear oil compositions.
  • a base oil for a gear oil (A) of this invention was prepared in the following manner: 1000 g of polypropylene glycol of an average molecular weight of 1,000, 144g (approximately 1.2 mol per mol of the polyglycol) of caproic acid (having six carbon atoms), and 100 g of toluene, were put in a flask. After adding to it 0.4 % by weight of phosphoric acid as a catalyst, the mixture was heated to 130°C, and then allowed to react at 100 to 120°C under atmospheric pressure and a nitrogen atmosphere. When the water formed during the reaction reached about one mol, the heating was stopped. Alkali (caustic soda) was then added to the reaction product to neutralize the unreacted carboxylic acid. The toluene was distilled off in vacuo, thereby giving an ester of polypropylene glycol with caproic acid.
  • base oils for gear oils (B to F) of this invention were prepared.
  • an extreme-­pressure agent tricresylphosphate
  • an antioxidant an aromatic amine compound
  • each gear oil composition of this invention as thus prepared was determined in the following manner: a four-ball wear tester (Shell type) was operated at an oil temperature of 150°C , at a rate of 1800 rpm under a load of 25 kg for 30 minutes, and then the wear diameter of a roller (1/2 inch) was determined. Table 2 shows the results.
  • each gear oil composition of this invention was determined according to Fed. 791 b. 5308 at an oil temperature of 150°C mentioned for 200 hours.
  • Comparative gear oils were prepared by adding the appropriate amounts of various additives such as a viscosity index improver, an antiwear agent, and an antioxidant, to various commercially available base oils. They were ATF-D II, ATF-D II′, Gear Oil 75W-90, a diester oil (DIDA: diisodecyl adipate), and polyglycol (polypropylene glycol), although no viscosity index improver was added to the diester and polyglycol oil. Table 1 shows the composition and properties of each gear oil thus obtained.
  • various additives such as a viscosity index improver, an antiwear agent, and an antioxidant
  • Examples 1 to 6 and Comparative Examples 1 to 5 indicate that the polyglycol ester gear oils of this invention are superior to conventional oils such as ATF-DII or Gear Oil 75 W-90 in their viscosity properties, wear resistance, and oxidation stability. Further, it was found that the polyglycol ester gear oils of this invention exhibited remarkably improved wear resistances and viscosity properties as compared to the diester oil (DIDA).
  • DIDA diester oil
  • polyoxyalkylene glycol ester synthetic lubricant oils of this invention which exhibit high oxidation stability and wear resistance at high temperatures, and high flowability at low temperatures, undergo less denaturation than conventional mineral-oil-based, polyglycol-based, or other synthetic, lubricant oils. Thus they can be used at a low cost with little or no maintenance for machines.

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

Abstract

Huile lubrifiante pour engrenages, contenant en tant qu'huile de base un ester de polyoxyalkylène-glycol obtenu par la réaction d'un polymère préparé par polymérisation ou copolymérisation à ouverture de noyau d'un ou de plusieurs membres sélectionnés parmi les oxydes d'alkylène comportant de 2 à 4 atomes de carbone avec un acide carboxylique comportant de 1 à 10 atomes de carbone. Cette huile lubrifiante présente des caractéristiques remarquablement bonnes de stabilité à l'oxydation et de résistance à l'abrasion à haute température et d'aptitude à l'écoulement à basse température.
EP87906604A 1987-08-26 1987-10-09 Composition d'une huile lubrifiante pour engrenages Ceased EP0340302A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CA000545362A CA1303600C (fr) 1987-08-26 1987-08-26 Composition d'huile de lubrification d'engrenages
PCT/JP1987/000763 WO1989003418A1 (fr) 1987-08-26 1987-10-09 Composition d'une huile lubrifiante pour engrenages

Publications (2)

Publication Number Publication Date
EP0340302A4 EP0340302A4 (fr) 1989-10-04
EP0340302A1 true EP0340302A1 (fr) 1989-11-08

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EP87906604A Ceased EP0340302A1 (fr) 1987-08-26 1987-10-09 Composition d'une huile lubrifiante pour engrenages

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EP (1) EP0340302A1 (fr)
JP (1) JPS62241996A (fr)
CA (1) CA1303600C (fr)
WO (1) WO1989003418A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0683217A1 (fr) * 1994-05-18 1995-11-22 ARCO Chemical Technology, L.P. Emulsion inverse faiblement toxique pour le forage de puits
WO2003062355A1 (fr) * 2002-01-23 2003-07-31 Oleon Esters lubrifiants a elastomere a gonflement reduit
WO2015063565A1 (fr) * 2013-10-29 2015-05-07 Dow Brasil Sudeste Industrial Ltda. Composition lubrifiante et procédé de lubrification de dispositif mécanique
WO2017091488A1 (fr) * 2015-11-25 2017-06-01 Santolubes Llc Fluides lubrifiants présentant une faible résistance au cisaillement
EP4010384A4 (fr) * 2019-08-08 2023-01-25 Dow Global Technologies, LLC Polyalkylène glycols solubles dans l'huile estérifié

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62241996A (ja) * 1987-08-26 1987-10-22 Toa Nenryo Kogyo Kk ギヤ用潤滑油組成物
CN1036925C (zh) * 1993-07-18 1998-01-07 中国科学院广州化学研究所 一种聚醚醇脂肪酸酯及其制法和用途
CN101784645A (zh) * 2007-08-24 2010-07-21 纳幕尔杜邦公司 润滑油组合物
KR20100043109A (ko) * 2007-08-24 2010-04-27 이 아이 듀폰 디 네모아 앤드 캄파니 윤활유 조성물
US20090054282A1 (en) * 2007-08-24 2009-02-26 E.I. Dupont De Nemours And Company Lubrication oil compositions

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2006831A1 (fr) * 1969-02-17 1970-09-03
JPS52127484A (en) * 1976-04-19 1977-10-26 Kao Corp Functional fluid composition
JPS62241996A (ja) * 1987-08-26 1987-10-22 Toa Nenryo Kogyo Kk ギヤ用潤滑油組成物
JPS62201995A (ja) * 1987-08-27 1987-09-05 Toa Nenryo Kogyo Kk ギヤ油組成物

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0683217A1 (fr) * 1994-05-18 1995-11-22 ARCO Chemical Technology, L.P. Emulsion inverse faiblement toxique pour le forage de puits
WO2003062355A1 (fr) * 2002-01-23 2003-07-31 Oleon Esters lubrifiants a elastomere a gonflement reduit
EP1335015A1 (fr) * 2002-01-23 2003-08-13 Oleon Esters lubrifiants avec gonflement réduit d'élastomères
WO2015063565A1 (fr) * 2013-10-29 2015-05-07 Dow Brasil Sudeste Industrial Ltda. Composition lubrifiante et procédé de lubrification de dispositif mécanique
CN105683341A (zh) * 2013-10-29 2016-06-15 陶氏巴西东南工业有限公司 一种润滑剂组合物以及润滑机械装置的方法
WO2017091488A1 (fr) * 2015-11-25 2017-06-01 Santolubes Llc Fluides lubrifiants présentant une faible résistance au cisaillement
US9879198B2 (en) 2015-11-25 2018-01-30 Santolubes Llc Low shear strength lubricating fluids
EP4010384A4 (fr) * 2019-08-08 2023-01-25 Dow Global Technologies, LLC Polyalkylène glycols solubles dans l'huile estérifié

Also Published As

Publication number Publication date
CA1303600C (fr) 1992-06-16
JPS62241996A (ja) 1987-10-22
WO1989003418A1 (fr) 1989-04-20
EP0340302A4 (fr) 1989-10-04

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