EP0332698A1 - Getriebeölzusammensetzung - Google Patents

Getriebeölzusammensetzung Download PDF

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Publication number
EP0332698A1
EP0332698A1 EP87905651A EP87905651A EP0332698A1 EP 0332698 A1 EP0332698 A1 EP 0332698A1 EP 87905651 A EP87905651 A EP 87905651A EP 87905651 A EP87905651 A EP 87905651A EP 0332698 A1 EP0332698 A1 EP 0332698A1
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EP
European Patent Office
Prior art keywords
gear
oil
viscosity
oils
polyoxyalkylene glycol
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Withdrawn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
EP87905651A
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English (en)
French (fr)
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EP0332698A4 (de
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
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 Tonen Corp, Toa Nenryo Kogyyo KK filed Critical Tonen Corp
Publication of EP0332698A4 publication Critical patent/EP0332698A4/de
Publication of EP0332698A1 publication Critical patent/EP0332698A1/de
Withdrawn legal-status Critical Current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 oil composition
  • a gear oil composition comprising polyoxyalkylene glycol(s) (also called simply polyglycol(s)) in this specification as a base oil. More particularly, it relates to a gear oil composition whose wear resistance and oxidation stability are improved by incorporating polyoxyalkylene glycol(s) having specific viscosity properties as a base oil.
  • gear devices using gears have been utilized in a variety of industrial fields because they steadily transmit power to a driven device. Depending on their usage these gear devices are broadly classified into industrial devices and those for use in automobiles. An appropriate gear oil suitable for the particular purpose is employed in each case.
  • a gear oil is a lubricant oil which 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.
  • a driving device e.g., a motor
  • mineral oils are exclusively employed as base oils of gear oils.
  • Gear oils further contain approximately 0.1 to 10 % by weight of various additives such as antioxidants, extreme pressure agents, rust preventives and anti-­ foaming agents.
  • base oils comprising mineral oils are mainly employed in gear oils.
  • a gear oil composition comprising such a base oil, as well as specific additives such as extreme-pressure agents or antioxidants, is usually employed.
  • gear oils is a lubricant oil composition disclosed in Japanese Patent Laid-Open No. 59-75995, wherein it is proposed to improve 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.
  • gear oils comprising mineral oils as base oils have been exclusively used in Japan, since mineral oils are relatively inexpensive; and a base oil for a gear oil use in conventional gear devices may be obtained by removing impurities such as unsaturated hydrocarbons and metallic components from a raw mineral oil through 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.
  • gear oils comprising mineral oils as base oils
  • 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.
  • gear oils which are contained therein in an amount of 70 to 95 % as base oils, are improved.
  • a gear oil comprising specific polyoxyalkylene glycol(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.
  • the present invention resides in a gear oil composition
  • a gear oil composition comprising polyoxyalkylene glycol(s) as a base oil wherein said polyoxyalkylene glycol(s) are polymer(s) 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 and have a viscosity of 5 mm2/s to 20 mm2/s at 100°C.
  • the polyglycol(s) of the present invention are polymer(s) 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 oxides, propylene oxides, butylene oxides and isobutylene oxides.
  • the polyglycols include, for example, polyethylene glycol, polypropylene glycol, polybutylene glycol, polyisobutylene glycol, a ring-opened copolymer of ethylene oxide and propylene oxide, and a ring-opened copolymer of propylene oxide and butylene oxide.
  • the average molecular weight of these polyalkylene glycols is approximately 800 to 2300.
  • polypropylene glycol of an average molecular weight of 1000 to 2000 may be employed in the present invention. It is required that such a polyoxyalkylene glycol have specific viscosity properties. Namely, the viscosity thereof at 100°C should be from 5 mm2/s to 20 mm2/s.
  • a polyoxyalkylene glycol having a viscosity lower 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 higher than 20 mm2/S is also undesirable because its poor flowability at low temperatures will result 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. It is possible to achieve a good lubricating effect by employing in the present invention polyoxyalkylene glycol(s) having a viscosity of 6 x 104 mPa.s to 95 x 104 mPa.s at -40°C.
  • a particularly preferred base oil for the gear oil of the present invention comprises polypropylene glycol or polyethylene glycol having a viscosity of 8 mm2/s to 19.8 mm2/s at 100°C and 10 x 104 mPa.s to 40 x 104 mPa.s at -40°C.
  • polypropylene glycol can be obtained by polymerizing propylene oxide in the presence of a metal alcoholate as a catalyst and water or an alcohol as a initiator under a pressure of 1 to 10 atm at 100 to 150°C.
  • polypropylene glycol may be used alone.
  • a base oil which is a mixture of polypropylene glycol and polyethylene glycol or polybutylene glycol may be used. It is highly effective to use a base oil comprising such a mixture of polyoxyalkylene glycols for achieving the viscosity properties as described above. That is to say, a polyoxyalkylene glycol base oil having appropriate viscosity properties can be readily obtained by blending polypropylene glycol, which has a high molecular weight and a high viscosity at low temperatures, with polyethylene glycol, which has a relatively low molecular weight and is highly flowable at low temperatures.
  • the polyoxyalkylene glycol(s) of the present invention may be blended with esters.
  • 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;
  • 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 tetra-hydric alcohols having 5 to 10 carbon atoms and fatty acids having 5 to 10 carbon atoms.
  • esters diesters such as diisodecyl adipate, dioctyl sebacate and dioctyl azelate, and triesters such as trimethylolpropane triheptanoate and trimethylolpropane trioctanoate are particularly preferred.
  • diesters such as diisodecyl adipate, dioctyl sebacate and dioctyl azelate
  • triesters such as trimethylolpropane triheptanoate and trimethylolpropane trioctanoate are particularly preferred.
  • These esters enhance the oxidation stability of polyalkylene glycols.
  • the addition of approximately 10 to 50 % by weight of the ester(s) can significantly enhance the lubricant properties of a gear oil comprising polyalkylene glycol(s) of a low viscosity, i.e., 5 to 20 mm2/s at 100°C, as a base oil.
  • the polyglycol synthetic lubricant oil of the present invention can be used as a gear oil. It exhibits remarkable effects, particularly when used as an industrial gear oil. Namely, it is useful as a gear oil utilized at high temperatures and high load or under unsettled temperature conditions, i.e., widely varying from low temperatures to high temperatures.
  • the polyglycol base oil may further contain conventional additives, depending on its application.
  • 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 preventives (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 preventives (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 as aromatic
  • the polyoxyalkylene glycols are polyether(s) wherein oxyalkylene(s) are polymerized through a ring-opening mechanism, the polyoxyalkylene glycol(s) of the present invention have high oxidation stability and flowability even at high temperatures. Furthermore, they can act as a viscosity index improver since they have specific viscosities at both high and low temperatures. Although the presence of the hydroxyl (alcohol) groups at the ends of the polyoxyalkylene glycol(s) may decrease the oxidation stability thereof at high temperatures, the lubricant properties of the gear oil product are not affected thereby since the base oil shows excellent interaction with antioxidants such as aromatic amine compounds.
  • Gear oil compositions (A to F) of the present invention were prepared by using a polyoxyalkylene glycol (polypropylene glycol or polyethylene glycol) as a base oil and adding tricresyl phosphate as an extreme-pressure agent and an aromatic amine antioxidant thereto.
  • Table 1 shows the composition of each gear oil thus obtained and the viscosity properties thereof at 100°C and -40°C.
  • each gear oil composition of the present invention 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 the present invention was also determined according to Fed. 791 b. 5308 at an oil temperature of 150°C for 200 hours.
  • Comparative gear oils (a to d) were prepared by adding appropriate amounts of various additives such as a viscosity index improver, an antiwear agent and an antioxidant to commercially available base oils which were ATF-D II, ATF-D II′, Gear oil 75W-90 and a diester oil (DIDA; diisodecyl adipate), although no viscosity index improver was added to the diester oil.
  • Table 1 shows the composition and properties of each gear oil thus obtained.
  • Examples 1 to 6 and Comparative Examples 1 to 4 indicate that the polyglycol gear oils of the present invention have almost the same wear resistances as those of the conventional ATF-D II and Gear Oil 75W-90 but are superior to these conventional oils in viscosity properties and oxidation stabilities. It was also found that the polyglycol gear oils of the present invention had remarkably improved wear resistances and viscosity properties compared with the diester oil (DIDA).
  • DIDA diester oil
  • a to F and d contain tricresyl phosphate and an aromatic amine but no viscosity index improver.
  • a and b contain 7 % by weight of a viscosity index improver.
  • c contains 20 % by weight of a viscosity index improver.
  • polyoxyalkylene glycol synthetic lubricant oils of the present invention which exhibit a high oxidation stability and wear resistance at high temperatures and high flowability at low temperatures, undergo less denaturation than conventional mineral oil- or ester-based lubricant oils. Thus, they can be used at a low cost with little or no maintenance.

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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)
EP87905651A 1987-08-27 1987-08-27 Getriebeölzusammensetzung Withdrawn EP0332698A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP1987/000636 WO1989001964A1 (en) 1987-08-27 1987-08-27 Gear oil composition

Publications (2)

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EP0332698A4 EP0332698A4 (de) 1989-09-11
EP0332698A1 true EP0332698A1 (de) 1989-09-20

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JP (1) JPS62201995A (de)
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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
JPS62201995A (ja) * 1987-08-27 1987-09-05 Toa Nenryo Kogyo Kk ギヤ油組成物
US5147324A (en) * 1988-12-06 1992-09-15 C. R. Bard, Inc. Prefilled syringe delivery system
JP4544444B2 (ja) * 2000-09-07 2010-09-15 株式会社ジャパンエナジー 車両用ギヤ油組成物
US7790660B2 (en) * 2004-02-13 2010-09-07 Exxonmobil Research And Engineering Company High efficiency polyalkylene glycol lubricants for use in worm gears
JP2010516871A (ja) * 2007-01-29 2010-05-20 ザ ルブリゾル コーポレイション 潤滑組成物
DE102020111403A1 (de) * 2020-04-27 2021-10-28 Klüber Lubrication München Se & Co. Kg Schmierstoffzusammensetzung und deren Verwendung
CN114164035A (zh) * 2021-12-15 2022-03-11 上海东大化学有限公司 涡轮蜗杆润滑油及其制备方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1448210A (fr) * 1965-06-22 1966-08-05 Kuhlmann Ets Compositions lubrifiantes et liquides de transfert conservant leurs propriétés en présence d'eau
EP0109515A2 (de) * 1982-09-29 1984-05-30 Union Carbide Corporation Wasserverträgliche Schmiermittelzusammensetzung
EP0293715A2 (de) * 1987-06-02 1988-12-07 Bayer Ag Polyether, Verfahren zu ihrer Herstellung und Schmiermittel, die diese Polyether enthalten

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52156274A (en) * 1976-06-21 1977-12-26 Nippon Oil Co Ltd Break grease composition
JPS62201995A (ja) * 1987-08-27 1987-09-05 Toa Nenryo Kogyo Kk ギヤ油組成物
JPH06232188A (ja) * 1993-01-29 1994-08-19 Nec Corp 半田材の製造方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1448210A (fr) * 1965-06-22 1966-08-05 Kuhlmann Ets Compositions lubrifiantes et liquides de transfert conservant leurs propriétés en présence d'eau
EP0109515A2 (de) * 1982-09-29 1984-05-30 Union Carbide Corporation Wasserverträgliche Schmiermittelzusammensetzung
EP0293715A2 (de) * 1987-06-02 1988-12-07 Bayer Ag Polyether, Verfahren zu ihrer Herstellung und Schmiermittel, die diese Polyether enthalten

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
MECHANICAL ENGINEERING, vol. 73, June 1951, pages 469-476; C.H. SWEATT et al.: "Some industrial experiences with synthetic lubricants" *
See also references of WO8901964A1 *

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EP0332698A4 (de) 1989-09-11
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