WO2013183463A1 - 流体軸受用潤滑油基油 - Google Patents
流体軸受用潤滑油基油 Download PDFInfo
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- WO2013183463A1 WO2013183463A1 PCT/JP2013/064480 JP2013064480W WO2013183463A1 WO 2013183463 A1 WO2013183463 A1 WO 2013183463A1 JP 2013064480 W JP2013064480 W JP 2013064480W WO 2013183463 A1 WO2013183463 A1 WO 2013183463A1
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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
- 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
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
- C10M169/04—Mixtures of base-materials and additives
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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
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/02—Hydroxy compounds
- C10M2207/021—Hydroxy compounds having hydroxy groups bound to acyclic or cycloaliphatic carbon atoms
- C10M2207/022—Hydroxy compounds having hydroxy groups bound to acyclic or cycloaliphatic carbon atoms containing at least two hydroxy groups
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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
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/10—Carboxylix acids; Neutral salts thereof
- C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
- C10M2207/125—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
- C10M2207/126—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids monocarboxylic
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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
- 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
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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
- 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
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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
- 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
- C10M2207/2895—Partial esters containing free hydroxy groups used as base material
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- 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
- C10N2020/02—Viscosity; Viscosity index
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- 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
- C10N2020/069—Linear chain compounds
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/02—Pour-point; Viscosity index
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/06—Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/08—Resistance to extreme temperature
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/10—Inhibition of oxidation, e.g. anti-oxidants
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/74—Noack Volatility
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- 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
Definitions
- the present invention relates to a lubricating base oil for fluid bearings.
- the hydrodynamic bearing supports the rotating shaft by the oil film pressure of the lubricating oil interposed in the gap between the outer peripheral surface of the shaft and the inner peripheral surface of the sleeve, and has a dynamic pressure groove on at least one of the outer peripheral surface of the shaft and the inner peripheral surface of the sleeve.
- the sliding surface of the rotating shaft is levitated and supported by a lubricating oil film formed by the dynamic pressure effect.
- a porous body made of sintered metal or the like is impregnated with lubricating oil or lubricating grease to have a self-lubricating function, and a sintered oil-impregnated bearing that supports the rotating shaft, and also a bearing surface of the sintered oil-impregnated bearing There is also a dynamic pressure type sintered oil-impregnated bearing provided with a dynamic pressure groove.
- Low-viscosity lubricant base oils include synthetic hydrocarbon base oils such as poly- ⁇ -olefins, ester base oils such as aliphatic dibasic acid diesters, neopentyl polyol esters, and fatty acid monoesters. Lubricating base oils for fluid bearings have been proposed (Patent Documents 1 to 8).
- ester-based lubricant base oils that are excellent in viscosity characteristics, heat resistance, low-temperature fluidity, and the like are often used as lubricant base oils for fluid bearings.
- ester-based lubricating base oils there are several types of ester-based lubricating base oils, each with different properties such as viscosity characteristics, heat resistance (volatility resistance), and low-temperature fluidity, and as the viscosity becomes lower, heat resistance (volatility resistance) ) Tend to be inferior. Therefore, simply selecting an ester-based lubricant base oil with a lower viscosity than the current one in order to reduce the torque of the fluid bearing will impair the heat resistance (volatility resistance) and reduce the durability of the fluid bearing. I will let you.
- ester base oil when existing ester base oil is used as a fluid bearing lubricant base oil, the ester bearing base oil will gradually decompose when the fluid bearing motor is used. When used, there was a problem.
- the present invention has a low viscosity change rate (high viscosity index) over a wide temperature range, low viscosity even at low temperature, low temperature fluidity and good volatility, and reduced base oil decomposition.
- the purpose is to provide a base oil.
- the present inventors have found that 3-methyl-1,5-pentanediol diester using a specific aliphatic monocarboxylic acid has a high viscosity index and a low viscosity even at low temperatures. It was found that the lubricating base oil had good low-temperature fluidity and volatility resistance and reduced base oil decomposition, and the present invention was completed. That is, the present invention is as follows.
- Item 4 The lubricant base oil for fluid bearings according to any one of Items 1 to 3, wherein the lubricant base oil for fluid bearings is a lubricant base oil for hydrodynamic fluid bearings or a lubricant base oil for sintered oil-impregnated bearings.
- Item 7 The fluid base lubricant base oil according to Item 6, wherein the fluid base lubricant base oil is a fluid bearing lubricant base oil for a spindle motor of a server hard disk drive.
- the rate of change of viscosity is small over a wide temperature range (high viscosity index), low viscosity even at low temperature, low temperature fluidity and good volatility resistance, and reduced decomposition of lubricating base oil A lubricating oil can be obtained.
- the lubricating base oil of the present invention is a lubricating base oil characterized by containing a methylpentanediol diester composed of a specific aliphatic monocarboxylic acid.
- the methylpentanediol diester according to the present invention is selected from the group consisting of n-undecanoic acid (component A) and n-hexanoic acid, n-heptanoic acid, n-octanoic acid, n-nonanoic acid and n-decanoic acid.
- methylpentanediol diester examples include diesters of 3-methyl-1,5-pentanediol with n-undecanoic acid and n-hexanoic acid, 3-methyl-1,5-pentanediol and n- Diester of undecanoic acid and n-heptanoic acid, diester of 3-methyl-1,5-pentanediol and n-undecanoic acid and n-octanoic acid, 3-methyl-1,5-pentanediol and n-undecanoic acid And diesters with n-nonanoic acid, diesters with 3-methyl-1,5-pentanediol and n-undecanoic acid and n-decanoic acid, 3-methyl-1,5-pentanediol and n-undecanoic acid, n Diesters with hexanoic acid and n
- the methylpentanediol diester of the present invention is produced by esterifying an aliphatic monocarboxylic acid with 3-methyl-1,5-pentanediol.
- the manufacturing method is not particularly limited, and a conventionally known manufacturing method can be used.
- 3-methyl-1,5-pentanediol and an aliphatic monocarboxylic acid are esterified in the presence of an esterification catalyst, followed by post-treatment and purification treatment.
- a step of obtaining such a methylpentanediol diester is exemplified.
- the aliphatic monocarboxylic acid is usually used in an amount of 2.0 to 3.0 mol, preferably 2.02 to 2.5 mol, per 1 mol of 3-methyl-1,5-pentanediol. It is done.
- esterification catalysts include Lewis acids and sulfonic acid derivatives. More specifically, examples of the Lewis acid include aluminum derivatives, tin derivatives, and titanium derivatives. Examples of the sulfonic acid derivative include p-toluenesulfonic acid, methanesulfonic acid, and sulfuric acid. The amount used is, for example, usually about 0.01 to 5.0% by weight based on the total weight of 3-methyl-1,5-pentanediol and aliphatic monocarboxylic acid.
- the esterification reaction is preferably carried out at a reaction temperature of usually 120 to 250 ° C., preferably 140 to 230 ° C. in the presence of an inert gas.
- the reaction time is usually about 3 to 30 hours.
- the produced water may be distilled off azeotropically outside the system using a water entraining agent such as benzene, toluene, xylene, cyclohexane and the like.
- the methylpentanediol diester can be purified by conventional purification methods such as neutralization, water washing, liquid extraction, vacuum distillation, purification of adsorbents such as activated carbon.
- the lubricating base oil for fluid bearings of the present invention generally has a kinematic viscosity at 40 ° C. in the range of usually 1 to 20 mm 2 / s, more preferably 5 to 15 mm 2 / s, particularly 7 to 13 mm 2 / s. A range of s is recommended.
- the said kinematic viscosity is a value obtained by the method described in the postscript Example.
- a viscosity index of 120 or more is usually recommended, more preferably 130 or more, and particularly 150 or more is recommended.
- the said viscosity index is a value obtained by the method described in the postscript Example.
- the lubricating base oil for a hydrodynamic bearing of the present invention can be evaluated as fluidity at low temperatures, for example, by the pour point of a low temperature fluidity test.
- the pour point is usually recommended to be 0 ° C. or lower, more preferably ⁇ 15 ° C. or lower.
- the said pour point is a value obtained by the method described in the postscript Example.
- the lubricating base oil for fluid bearings of the present invention can be evaluated as heat resistance, for example, by the amount of volatilization in a heat resistance test.
- the volatilization amount is usually 5% by weight or less, more preferably 4% by weight or less, and particularly preferably 2% by weight or less.
- the said volatilization amount is a value obtained by the method described in the postscript Example.
- the lubricating base oil for a hydrodynamic bearing of the present invention can be evaluated as lubricity, for example, by the wear scar diameter by a lubricity test.
- the wear scar diameter is preferably 0.60 mm or less, more preferably 0.58 mm or less, and particularly preferably 0.55 mm or less. The smaller the wear scar diameter, the better the lubricity.
- the said wear scar diameter is a value obtained by the lubricity test described in the postscript Example.
- the lubricating base oil for fluid bearings of the present invention measures, for example, the increased amount of a partial ester (a compound in which one ester group of a diester compound has been hydrolyzed) after the lubricity test as stability during use. Can be evaluated.
- the increase amount of the partial ester after the lubricating oil test is preferably 0.10 GC area% or less, more preferably 0.08 GC area% or less, particularly preferably 0.06 GC area% or less.
- the smaller the increase in the partial ester the better the stability of the lubricating base oil.
- the increase amount of the said partial ester is a value obtained by the increase amount measurement of the partial ester described in the postscript Example.
- the stability at the time of use can be evaluated also by the increase amount of the total acid value after a lubricity test.
- the amount of increase in the total acid value after the lubricity test is preferably 0.60 mgKOH / g or less, more preferably 0.55 mgKOH / g or less, particularly preferably 0.50 mgKOH / g or less.
- the smaller the increase in total acid value the better the stability of the lubricating base oil.
- the increase amount of the total acid value is a value obtained by measuring the increase amount of the total acid value described in the examples below.
- the methylpentanediol diester is preferably contained in the lubricating base oil for fluid bearings of the present invention in an amount of 90% by weight or more, more preferably 95% by weight or more, and particularly preferably 98% by weight or more.
- the lubricating base oil for fluid bearings of the present invention includes mineral oil (hydrocarbon oil obtained by refining petroleum), poly- ⁇ -olefin, polybutene, alkylbenzene, alkylnaphthalene, alicyclic hydrocarbon oil, Synthetic hydrocarbon oils such as isomerized oils of synthetic hydrocarbons obtained by the Fischer-Tropsch method, animal and vegetable oils, organic acid esters other than this ester, polyalkylene glycol, polyvinyl ether, polyphenyl ether, alkylphenyl ether, silicone oil, etc. At least one of the combined base oils can be used in combination as appropriate.
- the mineral oil examples include solvent refined mineral oil, hydrorefined mineral oil, and wax isomerized oil.
- the kinematic viscosity at 100 ° C. is 1.0 to 25 mm 2 / s, preferably 2.0 to 20.0 mm 2. Those in the range of / s are used.
- poly- ⁇ -olefins examples include ⁇ -olefins having 2 to 16 carbon atoms (for example, ethylene, propylene, 1-butene, 1-hexene, 1-octene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, etc. ) a polymer or copolymer, kinematic viscosity 1.0 ⁇ 25 mm 2 / s at 100 ° C., is exemplified a viscosity index of 100 or more, to 20 kinematic viscosity 1.5 especially at 100 ° C. Those having a viscosity index of 120 mm or more at 0.0 mm 2 / s are preferable.
- ⁇ -olefins having 2 to 16 carbon atoms for example, ethylene, propylene, 1-butene, 1-hexene, 1-octene, 1-decene, 1-dodecene, 1-t
- polybutene examples include those obtained by polymerizing isobutylene and those obtained by copolymerizing isobutylene with normal butylene, and generally include a wide range of those having a kinematic viscosity at 100 ° C. of 2.0 to 40 mm 2 / s.
- alkyl benzene examples include monoalkyl benzene, dialkyl benzene, trialkyl benzene, and tetraalkyl benzene having a molecular weight of 200 to 450, which are substituted with a linear or branched alkyl group having 1 to 40 carbon atoms.
- alkylnaphthalene examples include monoalkylnaphthalene and dialkylnaphthalene substituted with a linear or branched alkyl group having 1 to 30 carbon atoms.
- animal and vegetable oils examples include beef tallow, lard, palm oil, coconut oil, rapeseed oil, castor oil, sunflower oil and the like.
- organic acid esters other than the present ester examples include fatty acid monoesters, aliphatic dibasic acid diesters, polyol esters, and other esters.
- the fatty acid monoester is an ester of an aliphatic linear or branched monocarboxylic acid having 5 to 22 carbon atoms and a linear or branched saturated or unsaturated aliphatic alcohol having 3 to 22 carbon atoms. Is mentioned.
- Aliphatic dibasic acid diesters include oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, 1,9-nonamethylenedicarboxylic acid, 1,10-deca And a full ester of an aliphatic dibasic acid such as methylenedicarboxylic acid or an anhydride thereof and a linear or branched saturated or unsaturated aliphatic alcohol having 3 to 22 carbon atoms.
- polyol esters examples include neopentyl glycol, 2,2-diethylpropanediol, 2-butyl-2-ethylpropandiol, trimethylolethane, trimethylolpropane, pentaerythritol, ditrimethylolpropane, dipentaerythritol and the like.
- esters examples include polymerized fatty acids such as dimer acid and hydrogenated dimer acid, or hydroxy fatty acids such as condensed castor oil fatty acid and hydrogenated condensed castor oil fatty acid, and linear or branched chains having 3 to 22 carbon atoms. And esters with saturated or unsaturated fatty alcohols.
- the polyalkylene glycol is exemplified by a ring-opening polymer of alcohol and a linear or branched alkylene oxide having 2 to 4 carbon atoms.
- alkylene oxide include ethylene oxide, propylene oxide, and butylene oxide.
- a polymer using one of these or a copolymer using a mixture of two or more can be used.
- a compound in which one or both hydroxyl groups are etherified can also be used.
- the kinematic viscosity of the polymer is 5.0 to 1000 mm 2 / s (40 ° C.), preferably 5.0 to 500 mm 2 / s (40 ° C.).
- Polyvinyl ether is a compound obtained by polymerization of a vinyl ether monomer, and monomers include methyl vinyl ether, ethyl vinyl ether, isopropyl vinyl ether, n-butyl vinyl ether, isobutyl vinyl ether, sec-butyl vinyl ether, tert-butyl vinyl ether, n-pentyl vinyl ether. N-hexyl vinyl ether, 2-methoxyethyl vinyl ether, 2-ethoxyethyl vinyl ether and the like.
- the kinematic viscosity of the polymer is 5.0 to 1000 mm 2 / s (40 ° C.), preferably 5.0 to 500 mm 2 / s (40 ° C.).
- polyphenyl ether examples include compounds having a structure in which meta positions of two or more aromatic rings are connected by an ether bond or a thioether bond. Specifically, bis (m-phenoxyphenyl) ether, m-bis ( m-phenoxyphenoxy) benzene, and thioethers (commonly referred to as C-ether) in which one or more of these oxygens are substituted with sulfur.
- alkyl phenyl ether examples include compounds in which polyphenyl ether is substituted with a linear or branched alkyl group having 6 to 18 carbon atoms, and alkyl diphenyl ether substituted with one or more alkyl groups is particularly preferable.
- silicone oil examples include dimethyl silicone and methylphenyl silicone, and modified silicones such as long-chain alkyl silicone and fluorosilicone.
- the content of the combined base oil in the lubricating base oil for fluid bearings of the present invention is preferably less than 10% by weight, preferably less than 5% by weight, particularly preferably less than 2% by weight.
- lubricating base oil for fluid bearings of the present invention
- an antioxidant such as metal detergents, ashless dispersants, oiliness agents, antiwear agents, extreme pressure agents, metal deactivators, rust inhibitors, viscosity index improvers, pour point depressants, antifoaming agents, hydrolysis inhibitors It is also possible to mix at least one of these appropriately.
- additives such as metal detergents, ashless dispersants, oiliness agents, antiwear agents, extreme pressure agents, metal deactivators, rust inhibitors, viscosity index improvers, pour point depressants, antifoaming agents, hydrolysis inhibitors It is also possible to mix at least one of these appropriately. Although these compounding quantities are not specifically limited as long as there exists an effect of this invention, The specific example is shown below.
- Antioxidants include 2,6-di-tert-butylphenol, 2,6-di-tert-butyl-p-cresol, 4,4′-methylenebis (2,6-di-tert-butylphenol), 4, 4'-butylidenebis (3-methyl-6-tert-butylphenol), 2,2'-methylenebis (4-ethyl-6-tert-butylphenol), 2,2'-methylenebis (4-methyl-6-tert-butylphenol) ), 4,4′-isopropylidenebisphenol, 2,4-dimethyl-6-tert-butylphenol, tetrakis [methylene-3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate] methane, 1,3-tris (2-methyl-4-hydroxy-5-tert-butylphenyl) butane, 1, , 5-Trimethyl-2,4,6-tris (3,5-di-tert-butyl-4-hydroxybenzyl
- Monophenyl-substituted diphenylamine p, p'-dibutyl (including straight and branched) diphenylamine, p, p'-dipentyl (including straight and branched) diphenylamine, p, p'-dihexyl (including linear and branched) diphenylamine p, p'-diheptyl (including linear and branched) diphenylamine, p, p'-dioctyl (including linear and branched) diphenylamine, p, p'-dinonyl (including linear and branched) diphenylamine Di (alkylphenyl) amines such as p, p′-di (C 4 -C 9 alkylphenyl) amine (ie, each of the two benzene rings of diphenylamine is an alkyl group, particularly a C 4 -C 9 alkyl group, Dialkyl
- p, p′-dioctyl including linear and branched diphenylamine
- p, p′-dinonyl including linear and branched diphenylamine
- N-phenyl-1-naphthylamine examples thereof include thiodipropionic acid esters such as di (n-dodecyl) acid and di (n-octadecyl) thiodipropionate
- sulfur compounds such as phenothiazine.
- These antioxidants may be used alone or in combination, and when used, they are usually added in an amount of 0.01 to 5% by weight, preferably 0.05 to 3% by weight, based on the lubricating base oil. It is desirable to do.
- 0.01 to 5% by weight based on the lubricating base oil refers to a lubricating base oil consisting only of the methylpentanediol diester according to the present invention or a mixture of the methylpentanediol diester and the combined base oil. This means 0.01 to 5 parts by weight per 100 parts by weight of the lubricating base oil. The same applies to the following similar expressions.
- Metal detergents include Ca-petroleum sulfonate, overbased Ca-petroleum sulfonate, Ca-alkylbenzene sulfonate, overbased Ca-alkylbenzene sulfonate, Ba-alkylbenzene sulfonate, overbased Ba-alkylbenzene sulfonate.
- ashless dispersants examples include polyalkenyl succinimide, polyalkenyl succinamide, polyalkenyl benzylamine, polyalkenyl succinate and the like. These ashless dispersants may be used alone or in combination. When used, it is usually desirable to add 1 to 10% by weight, preferably 2 to 7% by weight, based on the lubricating base oil. .
- oily agents include aliphatic saturated and unsaturated monocarboxylic acids such as stearic acid and oleic acid, polymerized fatty acids such as dimer acid and hydrogenated dimer acid, hydroxy fatty acids such as ricinoleic acid and 12-hydroxystearic acid, lauryl alcohol, Aliphatic saturated and unsaturated monoalcohols such as oleyl alcohol, aliphatic saturated and unsaturated monoamines such as stearylamine and oleylamine, aliphatic saturated and unsaturated monocarboxylic amides such as lauric acid amide and oleic acid amide, batyl alcohol, Glycerol ethers such as chimyl alcohol and ceralkyl alcohol, alkyl or alkenyl polyglyceryl ethers such as lauryl polyglyceryl ether and oleyl polyglyceryl ether, di (2-ethylhexyl) monoethanolamine, diisotride Poly (alkylene oxide
- Antiwear / extreme pressure agents include tricresyl phosphate, cresyl diphenyl phosphate, alkylphenyl phosphates, phosphate esters such as tributyl phosphate, dibutyl phosphate, tributyl phosphate, dibutyl phosphate, triisopropyl phosphate, etc.
- Phosphorous esters of these compounds and phosphorus compounds such as amine salts thereof, sulfurized fatty acids such as sulfurized fats and oils and sulfurized oleic acid, sulfur compounds such as dibenzyl disulfide, sulfurized olefin and dialkyl disulfide, Zn-dialkyldithiophosphate, Zn- Examples thereof include organometallic compounds such as dialkyldithiophosphate, Mo-dialkyldithiophosphate, and Mo-dialkyldithiocarbamate. These antiwear agents may be used alone or in combination. When used, they are usually added in an amount of 0.01 to 10% by weight, preferably 0.1 to 5% by weight, based on the lubricating base oil. It is desirable to do.
- metal deactivator examples include benzotriazole-based, thiadiazole-based, and gallic acid ester-based compounds. These metal deactivators may be used alone or in combination, and when used, they are usually 0.01 to 0.4% by weight, preferably 0.01 to 0%, based on the lubricating base oil. It is desirable to add 2% by weight.
- rust preventives include alkyl or alkenyl succinic acid derivatives such as dodecenyl succinic acid half ester, octadecenyl succinic anhydride, dodecenyl succinic acid amide, sorbitan monooleate, glycerin monooleate, pentaerythritol monooleate and many others.
- Monohydric alcohol partial ester Ca-petroleum sulfonate, Ca-alkyl benzene sulfonate, Ba-alkyl benzene sulfonate, Mg-alkyl benzene sulfonate, Na-alkyl benzene sulfonate, Zn-alkyl benzene sulfonate, Ca-alkyl naphthalene sulfate
- metal sulfonates such as phonates, amines such as rosinamine and N-oleylsarcosine, dialkyl phosphiteamine salts and the like.
- These rust inhibitors may be used alone or in combination. When used, they are usually added in an amount of 0.01 to 5% by weight, preferably 0.05 to 2% by weight, based on the lubricating base oil. It is desirable to do.
- viscosity index improver examples include olefin copolymers such as polyalkyl methacrylate, polyalkyl styrene, polybutene, ethylene-propylene copolymer, styrene-diene copolymer, and styrene-maleic anhydride ester copolymer. . These viscosity index improvers may be used alone or in combination, and when used, they are usually 0.1 to 15% by weight, preferably 0.5 to 7% by weight, based on the lubricating base oil. It is desirable to add.
- pour point depressant examples include a condensate of chlorinated paraffin and alkylnaphthalene, a condensate of chlorinated paraffin and phenol, polyalkyl methacrylate, polyalkylstyrene, polybutene and the like as the viscosity index improvers described above.
- These pour point depressants may be used alone or in combination, and when used, they are usually 0.01 to 5% by weight, preferably 0.1 to 3% by weight, based on the lubricating base oil. It is desirable to add.
- liquid silicone is suitable, and when it is used, the amount added is usually 0.0005 to 0.01% by weight based on the lubricating base oil.
- Hydrolysis inhibitors include alkyl glycidyl ethers, alkyl glycidyl esters, alkylene glycol glycidyl ethers, alicyclic epoxies, epoxy compounds such as phenyl glycidyl ether, di-tert-butylcarbodiimide, 1,3-di- A carbodiimide compound such as p-tolylcarbodiimide can be used, and it is usually desirable to add 0.05 to 2% by weight to the lubricating base oil.
- the lubricant base oil for fluid bearings of the present invention is hardly decomposed even after a lubricity test and has a small volatilization amount. Therefore, it is particularly suitable as a lubricant base oil for fluid bearings for spindle motors. Can do. Among them, it is suitable for a lubricant base oil for a fluid bearing for a spindle motor of a hard disk drive, particularly for a spindle motor of a hard disk drive for a server.
- Volatilization amount (%) [(W 0 ⁇ W) / W 0 ] ⁇ 100 [Wherein W 0 represents the weight before the test, and W represents the weight after the test. ].
- n-Hexanoic acid Used by distillation purification of [Hexanoic Acid] manufactured by Tokyo Chemical Industry Co., Ltd. (nC 6 acid)
- n-Heptanoic acid Used by distillation purification of [NORMAL HEPTANOIC ACID] manufactured by Arkema (nC 7 acid)
- n-octanoic acid Distilled and purified [Caprylic acid] manufactured by Shin Nippon Rika Co., Ltd.
- nC 8 acids used by distillation purification of [n-Pelargonic Acid] manufactured by OXEA (nC 9 acid)
- n-decanoic acid used by distillation purification of [Capric acid] manufactured by Shin Nippon Rika Co., Ltd.
- nC 10 acid used by distillation purification of [Undecanoic Acid] manufactured by Tokyo Chemical Industry Co., Ltd.
- nC 11 acid used by distillation purification of [Undecanoic Acid] manufactured by Tokyo Chemical Industry Co., Ltd.
- Example 1 In a 1-liter four-necked flask equipped with a stirrer, thermometer, and water fraction receiver with a condenser, n-hexanoic acid 106.5 g (0.92 mol), n-undecanoic acid 398.4 g (2.14) Mol), 177.0 g (1.50 mol) of 3-methyl-1,5-pentanediol, xylene (5 wt% based on the total amount of raw materials) and tin oxide (0.1 wt% based on the total amount of raw materials) as a catalyst ), And after nitrogen substitution, the temperature was gradually raised to 230 ° C.
- Esterification reaction is carried out by adjusting the degree of pressure reduction so that reflux occurs while removing the produced water distilled off with the water fractionator with the theoretical amount of produced water (54.0 g) as the target. The reaction was continued until the value became 20 or less. After completion of the reaction, xylene and the remaining raw material aliphatic monocarboxylic acid were removed by distillation to obtain a crude esterified product. Subsequently, after neutralizing with 1.2 equivalent of caustic soda aqueous solution with respect to the total acid value of the obtained esterified crude substance, it washed with water until it became neutral.
- the total acid number, kinematic viscosity, viscosity index, low temperature fluidity test, heat resistance test, lubricity test, and lubricating base oil after the lubricity test of the synthesized ester were analyzed, and the test results are shown in Table 1. It was.
- the lubricating base oil of the present invention is extremely superior in the stability evaluation of the lubricating base oil (increased amount of partial ester, increased amount of total acid value) compared to Comparative Examples 1 to 6. It can be seen that the performance as a lubricant base oil (kinematic viscosity, viscosity index, low temperature fluidity, heat resistance, lubricity) is also excellent.
- the lubricating base oil for fluid bearings of the present invention has a low viscosity change rate (high viscosity index) over a wide temperature range, low viscosity even at low temperature, low temperature fluidity and good volatility resistance, The decomposition of the base oil can be reduced, and thus the hydrodynamic bearing motor can be used stably for a long period of time.
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Abstract
Description
即ち、本発明は、以下のものである。
3-メチル-1,5-ペンタンジオールと、
n-ウンデカン酸(A成分)、並びに
n-ヘキサン酸、n-ヘプタン酸、n-オクタン酸、n-ノナン酸及びn-デカン酸からなる群より選ばれる少なくとも1種の脂肪族モノカルボン酸(B成分)とをエステル化反応して得られるメチルペンタンジオールジエステルであって、
A成分とB成分のモル比が30:70~70:30の範囲であるメチルペンタンジオールジエステルを含有することを特徴とする流体軸受用潤滑油基油。
B成分が、n-オクタン酸、n-ノナン酸及びn-デカン酸からなる群より選ばれる少なくとも1種である、項1に記載の流体軸受用潤滑油基油。
流体軸受用潤滑油基油中のメチルペンタンジオールジエステルが90重量%以上である、項1又は2に記載の流体軸受用潤滑油基油。
前記流体軸受用潤滑油基油が、動圧流体軸受用潤滑油基油又は焼結含油軸受用潤滑油基油である、項1~3のいずれかに記載の流体軸受用潤滑油基油。
流体軸受用潤滑油基油が、スピンドルモータ用の流体軸受用潤滑油基油である、項1~4のいずれかに記載の流体軸受用潤滑油基油。
流体軸受用潤滑油基油が、ハードディスクドライブのスピンドルモータ用の流体軸受用潤滑油基油である、項5に記載の流体軸受用潤滑油基油。
流体軸受用潤滑油基油が、サーバー向けハードディスクドライブのスピンドルモータ用の流体軸受用潤滑油基油である、項6に記載の流体軸受用潤滑油基油。
本発明に係るメチルペンタンジオールジエステルは、n-ウンデカン酸(A成分)、並びに、n-ヘキサン酸、n-ヘプタン酸、n-オクタン酸、n-ノナン酸及びn-デカン酸からなる群より選ばれる少なくとも1種の脂肪族モノカルボン酸(B成分)を、A成分とB成分のモル比が30:70~70:30の範囲で含有する混合酸と、3-メチル-1,5-ペンタンジオールとのエステル化反応から得られるものである。
本発明のメチルペンタンジオールジエステルは、3-メチル-1,5-ペンタンジオールに脂肪族モノカルボン酸をエステル化反応することにより製造される。当該製造方法には、特に限定がなく、従来公知の製造方法を用いることができる。
JIS-K-2501(1992)に準拠して測定した。なお検出限界は0.01mgKOH/gである。
JIS-K-2283(2000)に準拠して、40℃、100℃における動粘度を測定した。但し、0℃動粘度はJIS-K-2283(2000)に規定される粘度-温度関係式より算出した。
JIS-K-2283(2000)に準拠して算出した。
JIS-K-2269(1987)に準拠して流動点を測定した。
実施例又は比較例の各々の潤滑油基油に対し、2,2’-メチレンビス-2,6-ジ-tert-ブチルフェノール(東京化成工業(株)製)、IRGANOX L57(製品名,BASF製)、各0.5重量%を添加し溶解させて潤滑油組成物を調製した。当該潤滑油組成物を、内径25mm、高さ90mmのガラス管にエステル10gを秤量し、ガラス管を2本取り付けたシリコンゴム栓を付け、片方の管から空気を1.0NL/minで送る。150℃に設定したオイルバスにガラス管を浸漬して、20時間加熱した。加熱試験後の揮発量は下記の式に従い算出した。
揮発量(%)=[(W0-W)/W0]×100
[式中、W0は試験前の重量を示し、Wは試験後の重量を示す。]。
JPI-5S-32-90に準拠して、高速四球型摩耗試験機(神鋼造機製)を用いて、回転数1200rpm、荷重40kg、温度75℃、時間60分の条件で試験し、摩耗痕径を測定した。
(g)部分エステルの増加量測定
潤滑性試験前及び試験後の潤滑油基油をガスクロマトグラフィー(GC)により分析し、部分エステル(ジエステル化合物の片方のエステル基が加水分解した化合物)を測定し、試験後の部分エステルのGC面積%の増加量を算出した。なお、混合エステルについては、各々の部分エステルを合計した。
[GC分析条件]
機器:島津製作所製 GC-2010
カラム:J&W製TC-5 30mx0.25mm
カラム温度:60~300℃(昇温速度10℃/min)
インジェクション温度/検出器温度:305℃/305℃
検出器:FID
キャリアガス:ヘリウム
ガス流量:1.08ml/min
潤滑性試験前及び試験後の全酸価を測定し、試験後の全酸価の上昇量を算出した。
3-メチル-1,5-ペンタンジオール:クラレ(株)製[MPD]
n-ヘキサン酸:東京化成工業(株)製[Hexanoic Acid]を蒸留精製したものを使用(nC6酸)
n-ヘプタン酸:アルケマ社製[NORMAL HEPTANOIC ACID]を蒸留精製したものを使用(nC7酸)
n-オクタン酸:新日本理化(株)製[カプリル酸]を蒸留精製したものを使用(nC8酸)
n-ノナン酸:OXEA社製[n-Pelargonic Acid]を蒸留精製したものを使用(nC9酸)
n-デカン酸:新日本理化(株)製[カプリン酸]を蒸留精製したものを使用(nC10酸)
n-ウンデカン酸:東京化成工業(株)製[Undecanoic Acid]を蒸留精製したものを使用(nC11酸)
撹拌器、温度計、冷却管付き水分分留受器を備えた1リットルの四ツ口フラスコにn-ヘキサン酸106.5g(0.92モル)、n-ウンデカン酸398.4g(2.14モル)、3-メチル-1,5-ペンタンジオール177.0g(1.50モル)、キシレン(原料の総量に対し5重量%)及び触媒として酸化スズ(原料の総量に対し0.1重量%)を仕込み、窒素置換した後、徐々に230℃まで昇温した。理論生成水量(54.0g)を目処にして留出してくる生成水を水分分留受器で除去しつつ、還流が起こるように減圧度を調整しながら、エステル化反応を行い、全酸価が20以下となるまで反応を行った。反応終了後、キシレン及び残存する原料脂肪族モノカルボン酸を蒸留により除去してエステル化粗物を得た。次いで、得られたエステル化粗物の全酸価に対して1.2当量の苛性ソーダ水溶液で中和した後、中性になるまで水洗した。更に、得られたエステル化粗物を活性炭で処理した後、濾過により活性炭を除去して、全酸価が0.01mgKOH/g以下、部分エステル量0.12GC面積%の3-メチル-1,5-ペンタンジオールとn-ヘキサン酸、n-ウンデカン酸(モル比:nC6酸/nC11酸=30/70)とのジエステル521.8gを得た。合成したエステルの全酸価、動粘度、粘度指数、低温流動性試験、耐熱性試験、潤滑性試験及び潤滑性試験後の潤滑油基油の分析を行い、それらの試験結果を表1に示した。
n-ヘキサン酸に代えてn-オクタン酸220.3g(1.53モル)を用い、n-ウンデカン酸の使用量を284.6g(1.53モル)に変えた以外は、実施例1と同様の方法により、本発明の3-メチル-1,5-ペンタンジオールとn-オクタン酸、n-ウンデカン酸(モル比:nC8酸/nC11酸=50/50)とのジエステル574.7gを得た。合成したエステルの全酸価、動粘度、粘度指数、低温流動性試験、耐熱性試験、潤滑性試験及び潤滑性試験後の潤滑油基油の分析を行い、それらの試験結果を表1に示した。
n-ヘキサン酸に代えてn-ノナン酸241.7g(1.53モル)を用い、n-ウンデカン酸の使用量を284.6g(1.53モル)に変えた以外は、実施例1と同様の方法により、本発明の3-メチル-1,5-ペンタンジオールとn-ノナン酸、n-ウンデカン酸(モル比:nC9酸/nC11酸=50/50)とのジエステル594.3gを得た。合成したエステルの全酸価、動粘度、粘度指数、低温流動性試験、耐熱性試験、潤滑性試験及び潤滑性試験後の潤滑油基油の分析を行い、それらの試験結果を表1に示した。
n-ヘキサン酸に代えてn-デカン酸157.9g(0.92モル)を用いた以外は、実施例1と同様の方法により、本発明の3-メチル-1,5-ペンタンジオールとn-デカン酸、n-ウンデカン酸(モル比:nC10酸/nC11酸=30/70)とのジエステル620.2gを得た。合成したエステルの全酸価、動粘度、粘度指数、低温流動性試験、耐熱性試験、潤滑性試験及び潤滑性試験後の潤滑油基油の分析を行い、それらの試験結果を表1に示した。
n-ヘキサン酸に代えてn-デカン酸263.2g(1.53モル)を用い、n-ウンデカン酸の使用量を284.6g(1.53モル)に変えた以外は、実施例1と同様の方法により、本発明の3-メチル-1,5-ペンタンジオールとn-デカン酸、n-ウンデカン酸(モル比:nC10酸/nC11酸=50/50)とのジエステル613.8gを得た。合成したエステルの全酸価、動粘度、粘度指数、低温流動性試験、耐熱性試験、潤滑性試験及び潤滑性試験後の潤滑油基油の分析を行い、それらの試験結果を表1に示した。
n-ヘキサン酸に代えてn-デカン酸368.4g(2.14モル)を用い、n-ウンデカン酸の使用量を170.7g(0.92モル)に変えた以外は、実施例1と同様の方法により、本発明の3-メチル-1,5-ペンタンジオールとn-デカン酸、n-ウンデカン酸(モル比:nC10酸/nC11酸=70/30)とのジエステル606.4gを得た。合成したエステルの全酸価、動粘度、粘度指数、低温流動性試験、耐熱性試験、潤滑性試験及び潤滑性試験後の潤滑油基油の分析を行い、それらの試験結果を表1に示した。
n-ヘキサン酸に代えてn-ノナン酸145.0g(0.92モル)及びn-デカン酸157.9g(0.92モル)を用い、n-ウンデカン酸の使用量を227.7g(1.22モル)に変えた以外は、実施例1と同様の方法により、本発明の3-メチル-1,5-ペンタンジオールとn-ノナン酸、n-デカン酸、n-ウンデカン酸(モル比:nC9酸/nC10酸/nC11酸=30/30/40)とのジエステル594.3gを得た。合成したエステルの全酸価、動粘度、粘度指数、低温流動性試験、耐熱性試験、潤滑性試験及び潤滑性試験後の潤滑油基油の分析を行い、それらの試験結果を表1に示した。
n-ヘキサン酸355.0g(3.06モル)と3-メチル-1,5-ペンタンジオール177.0g(1.50モル)とを用いた以外は、実施例1と同様の方法により、本発明の3-メチル-1,5-ペンタンジオール-ジ(n-ヘキサノエート)438.0gを得た。合成したエステルの全酸価、動粘度、粘度指数、低温流動性試験、耐熱性試験、潤滑性試験及び潤滑性試験後の潤滑油基油の分析を行い、それらの試験結果を表1に示した。
n-ヘプタン酸397.8g(3.06モル)と3-メチル-1,5-ペンタンジオール177.0g(1.50モル)とを用いた以外は、実施例1と同様の方法により、本発明の3-メチル-1,5-ペンタンジオール-ジ(n-ヘキサノエート)477.1gを得た。合成したエステルの全酸価、動粘度、粘度指数、低温流動性試験、耐熱性試験、潤滑性試験及び潤滑性試験後の潤滑油基油の分析を行い、それらの試験結果を表1に示した。
n-オクタン酸440.6g(3.06モル)と3-メチル-1,5-ペンタンジオール177.0g(1.50モル)とを用いた以外は、実施例1と同様の方法により、本発明の3-メチル-1,5-ペンタンジオール-ジ(n-ヘキサノエート)516.2gを得た。合成したエステルの全酸価、動粘度、粘度指数、低温流動性試験、耐熱性試験、潤滑性試験及び潤滑性試験後の潤滑油基油の分析を行い、それらの試験結果を表1に示した。
n-ノナン酸483.5g(3.06モル)と3-メチル-1,5-ペンタンジオール177.0g(1.50モル)とを用いた以外は、実施例1と同様の方法により、本発明の3-メチル-1,5-ペンタンジオール-ジ(n-ヘキサノエート)555.2gを得た。合成したエステルの全酸価、動粘度、粘度指数、低温流動性試験、耐熱性試験、潤滑性試験及び潤滑性試験後の潤滑油基油の分析を行い、それらの試験結果を表1に示した。
n-デカン酸526.3g(3.06モル)と3-メチル-1,5-ペンタンジオール177.0g(1.50モル)とを用いた以外は、実施例1と同様の方法により、本発明の3-メチル-1,5-ペンタンジオール-ジ(n-ヘキサノエート)594.3gを得た。合成したエステルの全酸価、動粘度、粘度指数、低温流動性試験、耐熱性試験、潤滑性試験及び潤滑性試験後の潤滑油基油の分析を行い、それらの試験結果を表1に示した。
n-ウンデカン酸569.2g(3.06モル)と3-メチル-1,5-ペンタンジオール177.0g(1.50モル)とを用いた以外は、実施例1と同様の方法により、本発明の3-メチル-1,5-ペンタンジオール-ジ(n-ヘキサノエート)633.3gを得た。合成したエステルの全酸価、動粘度、粘度指数、低温流動性試験、耐熱性試験、潤滑性試験及び潤滑性試験後の潤滑油基油の分析を行い、それらの試験結果を表1に示した。
Claims (5)
- 3-メチル-1,5-ペンタンジオールと、
n-ウンデカン酸(A成分)、並びに
n-ヘキサン酸、n-ヘプタン酸、n-オクタン酸、n-ノナン酸及びn-デカン酸からなる群より選ばれる少なくとも1種の脂肪族モノカルボン酸(B成分)とをエステル化反応して得られるメチルペンタンジオールジエステルであって、
A成分とB成分のモル比が30:70~70:30の範囲であるメチルペンタンジオールジエステルを含有することを特徴とする流体軸受用潤滑油基油。 - B成分が、n-オクタン酸、n-ノナン酸及びn-デカン酸からなる群より選ばれる少なくとも1種である、請求項1に記載の流体軸受用潤滑油基油。
- 流体軸受用潤滑油基油中のメチルペンタンジオールジエステルが90重量%以上である、請求項1又は2に記載の流体軸受用潤滑油基油。
- 流体軸受用潤滑油基油が、動圧流体軸受用潤滑油基油又は焼結含油軸受用潤滑油基油である、請求項1~3のいずれかに記載の流体軸受用潤滑油基油。
- 流体軸受用潤滑油基油が、スピンドルモータ用の流体軸受用潤滑油基油である、請求項1~4のいずれかに記載の流体軸受用潤滑油基油。
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US14/399,341 US9663741B2 (en) | 2012-06-07 | 2013-05-24 | Lubricant base oil for fluid bearing |
CN201380030112.5A CN104379711A (zh) | 2012-06-07 | 2013-05-24 | 流体轴承用润滑油基油 |
JP2014519923A JP6040986B2 (ja) | 2012-06-07 | 2013-05-24 | 流体軸受用潤滑油基油 |
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US (1) | US9663741B2 (ja) |
JP (1) | JP6040986B2 (ja) |
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JP2014209030A (ja) * | 2013-03-28 | 2014-11-06 | ミネベア株式会社 | 流体動圧軸受油、及びそれを用いた流体動圧軸受ならびにスピンドルモータ |
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CN107394945A (zh) * | 2017-08-16 | 2017-11-24 | 杭州江南电机股份有限公司 | 一种卫厨吊顶电器专用电机 |
JP7153476B2 (ja) | 2018-06-08 | 2022-10-14 | 出光興産株式会社 | 潤滑油組成物、及び含浸軸受 |
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JP2005154726A (ja) * | 2003-05-19 | 2005-06-16 | New Japan Chem Co Ltd | 潤滑油 |
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JP3849482B2 (ja) | 2001-10-10 | 2006-11-22 | 新日本理化株式会社 | 潤滑油 |
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2013
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- 2013-05-24 JP JP2014519923A patent/JP6040986B2/ja active Active
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WO2004018595A1 (ja) * | 2002-08-22 | 2004-03-04 | New Japan Chemical Co., Ltd. | 軸受用潤滑油 |
JP2005154726A (ja) * | 2003-05-19 | 2005-06-16 | New Japan Chem Co Ltd | 潤滑油 |
JP2005290256A (ja) * | 2004-04-01 | 2005-10-20 | Matsushita Electric Ind Co Ltd | 流体軸受装置、及びそれを用いたスピンドルモータ |
WO2011017629A1 (en) * | 2009-08-06 | 2011-02-10 | Seagate Technology Llc | Hydrodynamic disc drive spindle motors having hydro bearing with lubricant including conductivity inducing agent |
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JP2014209030A (ja) * | 2013-03-28 | 2014-11-06 | ミネベア株式会社 | 流体動圧軸受油、及びそれを用いた流体動圧軸受ならびにスピンドルモータ |
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US20150072911A1 (en) | 2015-03-12 |
JPWO2013183463A1 (ja) | 2016-01-28 |
JP6040986B2 (ja) | 2016-12-07 |
CN104379711A (zh) | 2015-02-25 |
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