WO2020195509A1 - Composition de graisse - Google Patents

Composition de graisse Download PDF

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Publication number
WO2020195509A1
WO2020195509A1 PCT/JP2020/007973 JP2020007973W WO2020195509A1 WO 2020195509 A1 WO2020195509 A1 WO 2020195509A1 JP 2020007973 W JP2020007973 W JP 2020007973W WO 2020195509 A1 WO2020195509 A1 WO 2020195509A1
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Prior art keywords
grease composition
nanofibers
mass
base oil
oil
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PCT/JP2020/007973
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English (en)
Japanese (ja)
Inventor
祐輔 中西
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出光興産株式会社
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Publication date
Application filed by 出光興産株式会社 filed Critical 出光興産株式会社
Priority to US17/437,155 priority Critical patent/US20220145207A1/en
Priority to JP2021508852A priority patent/JPWO2020195509A1/ja
Priority to CN202080022892.9A priority patent/CN113631692A/zh
Priority to EP20777316.9A priority patent/EP3943583A4/fr
Publication of WO2020195509A1 publication Critical patent/WO2020195509A1/fr

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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
    • C10M171/00—Lubricating compositions characterised by purely physical criteria, e.g. containing as base-material, thickener or additive, ingredients which are characterised exclusively by their numerically specified physical properties, i.e. containing ingredients which are physically well-defined but for which the chemical nature is either unspecified or only very vaguely indicated
    • C10M171/06—Particles of special shape or size
    • 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
    • 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
    • C10M119/00—Lubricating compositions characterised by the thickener being a macromolecular compound
    • C10M119/04—Lubricating compositions characterised by the thickener being a macromolecular compound containing oxygen
    • C10M119/20—Polysaccharides, e.g. cellulose
    • 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
    • C10M123/00—Lubricating compositions characterised by the thickener being a mixture of two or more compounds covered by more than one of the main groups C10M113/00 - C10M121/00, each of these compounds being essential
    • C10M123/04—Lubricating compositions characterised by the thickener being a mixture of two or more compounds covered by more than one of the main groups C10M113/00 - C10M121/00, each of these compounds being essential at least one of them being a macromolecular 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
    • C10M125/00—Lubricating compositions characterised by the additive being an inorganic material
    • C10M125/26—Compounds containing silicon or boron, e.g. silica, sand
    • C10M125/30—Clay
    • 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
    • C10M145/00—Lubricating compositions characterised by the additive being a macromolecular compound containing oxygen
    • C10M145/40—Polysaccharides, e.g. cellulose
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
    • C10M169/06—Mixtures of thickeners and additives
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
    • C10M2201/10—Compounds containing silicon
    • C10M2201/102—Silicates
    • C10M2201/103—Clays; Mica; Zeolites
    • C10M2201/1036—Clays; Mica; Zeolites used as thickening agents
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
    • C10M2201/14—Inorganic compounds or elements as ingredients in lubricant compositions inorganic compounds surface treated with organic 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
    • C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
    • C10M2203/003—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions 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
    • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
    • C10M2205/02—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers
    • C10M2205/028—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers containing aliphatic monomers having more than four carbon atoms
    • C10M2205/0285—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers containing aliphatic monomers having more than four carbon atoms 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
    • C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
    • C10M2205/06—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing conjugated dienes
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/10—Carboxylix acids; Neutral salts thereof
    • C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
    • C10M2207/125—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
    • C10M2207/126—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids monocarboxylic
    • C10M2207/1265—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids monocarboxylic used as thickening agent
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/28—Esters
    • C10M2207/287—Partial esters
    • C10M2207/289—Partial esters containing free hydroxy groups
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
    • C10M2209/12—Polysaccharides, e.g. cellulose, biopolymers
    • C10M2209/126—Polysaccharides, e.g. cellulose, biopolymers used as thickening agents
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/02—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
    • 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
    • C10M2223/047—Thioderivatives not containing metallic elements
    • 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
    • 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
    • C10N2020/055—Particles related characteristics
    • C10N2020/063—Fibrous forms
    • 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
    • C10N2030/54—Fuel economy
    • 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
    • C10N2030/62—Food grade 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
    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/68—Shear stability
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/04—Oil-bath; Gear-boxes; Automatic transmissions; Traction drives
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2050/00—Form in which the lubricant is applied to the material being lubricated
    • C10N2050/10—Semi-solids; greasy

Definitions

  • the present invention relates to a grease composition. More specifically, the present invention relates to grease compositions used in speed reducers and speed increasers.
  • Grease is easier to seal than lubricating oil, and the applied machine can be made smaller and lighter. Therefore, it has been widely used for lubrication of various sliding parts such as automobiles, electric devices, industrial machines, and industrial machines.
  • grease has also been used in speed reducers used in industrial robots and the like and speed increasers used in wind power generation facilities and the like (see, for example, Patent Document 1).
  • the speed reducer has a mechanism for decelerating and transmitting torque to the output side by applying torque to the input side.
  • the speed increaser has a mechanism for speeding up and transmitting torque to the output side by applying torque to the input side.
  • Grease used for the lubrication parts of speed reducers and speed reducers is required to have excellent energy transfer efficiency from the viewpoint of suppressing the loss of torque (energy) applied to the input side and transmitting it to the output side without waste. ..
  • An object of the present invention is to provide a grease composition for a speed reducer and a speed increaser, which is excellent in both leakage prevention performance and energy transfer efficiency.
  • the present inventors have found that a grease composition containing a base oil and specific nanofibers can solve the above-mentioned problems, and have completed the present invention.
  • a base oil (A) and nanofibers (B) having a thickness (d) of 1 to 500 nm are contained.
  • the nanofiber (B) is one or more selected from cellulose nanofibers (B1) and modified cellulose nanofibers (B2).
  • the content ratio [B1 / C] of the cellulose nanofibers (B1) and the organic bentonite (C) is 0.05 to 5.0 in terms of mass ratio, as described in [3] or [4].
  • the base oil (A) has a low viscosity base oil (A1) having a kinematic viscosity at 40 ° C. of 5 to 150 mm 2 / s and a high viscosity base oil (A1) having a kinematic viscosity at 40 ° C.
  • the lower limit value and the upper limit value described stepwise for a preferable numerical range can be independently combined.
  • a preferable numerical range for example, a range such as content
  • the numerical values of Examples are numerical values that can be used as upper limit values or lower limit values.
  • the grease composition of the present invention contains a base oil (A) and nanofibers (B) having a thickness (d) of 1 to 500 nm, and the nanofibers (B) are cellulose nanofibers (B1). And one or more selected from modified cellulose nanofibers (B2), a grease composition used in a speed reducer and a speed increaser.
  • the thickness (d) of the nanofibers (B) contained in the grease composition is specified. That is, the thickness (d) of the nanofibers (B) dispersed in the base oil (A) is defined.
  • the nanofibers (B) tend to form a higher-order structure in the base oil (A).
  • the nanofibers (B) can be easily dispersed uniformly in the base oil (A). As a result, even if the content of the nanofiber (B) is small, the grease composition can be easily adjusted to an appropriate miscibility, and is excellent in both leakage prevention performance and energy transfer efficiency.
  • the total content of the component (A) and the component (B) is preferably 50% by mass or more, more preferably 50% by mass or more, based on the total amount (100% by mass) of the grease composition. It is 60% by mass or more, more preferably 70% by mass or more, and even more preferably 80% by mass or more.
  • the upper limit of the total content of the component (A) and the component (B) may be adjusted in relation to the content of additives other than the component (B). It is preferably 99% by mass or less, more preferably 95% by mass or less, and further preferably 92% by mass or less.
  • the base oil (A) and the nanofibers (B) will be described in detail.
  • the base oil (A) contained in the grease composition of the present invention is not particularly limited, and examples thereof include mineral oil, synthetic oil, animal oil, vegetable oil, and liquid paraffin.
  • the base oil (A) may be a base oil consisting of only one type, or may be a mixed base oil in which two or more types are combined.
  • mineral oil examples include distillate obtained by distilling paraffin-based crude oil, intermediate-based crude oil, or naphthen-based crude oil at atmospheric pressure or atmospheric distillation residual oil under reduced pressure; these distillate oils can be removed from the solvent.
  • solvent dewaxing and catalytic dewaxing specifically, solvents.
  • mineral oils classified into Group 3 of the API (American Petroleum Institute) base oil category are preferable.
  • Synthetic oil examples include hydrocarbon oils, aromatic oils, ester oils, ether oils, fatty acid esters and the like.
  • hydrocarbon-based oil examples include normal paraffin, isoparaffin, polybutene, polyisobutylene, 1-decene oligomer, poly- ⁇ -olefin (PAO) such as 1-decene and ethylene co-oligomer, and hydrides thereof. ..
  • GTL synthetic oil obtained by isomerizing a wax GTL wax (Gas To Liquids WAX)) produced by the Fischer-Tropsch method or the like can also be mentioned.
  • aromatic oils examples include alkylbenzenes such as monoalkylbenzenes and dialkylbenzenes; alkylnaphthalenes such as monoalkylnaphthalene, dialkylnaphthalene and polyalkylnaphthalene; and the like.
  • Ester-based oils include di-butyl sebacate, di-2-ethylhexyl sebacate, dioctyl adipate, diisodecyl adipate, ditridecyl adipate, ditridecylglutarate, methylacetyllithinolate and other diester-based oils; trioctyl remeritate and tri.
  • Aromatic ester-based oils such as decyl trimerite and tetraoctylpyromerite; polyol esters such as trimethylolpropane caprilate, trimethylolpropane verargonate, pentaerythritol-2-ethylhexanoate and pentaerythritol verargonate.
  • System oils complex ester oils such as oligoesters of polyhydric alcohols and mixed fatty acids of dibasic acid and monobasic acid; and the like.
  • ether-based oils include polyglycols such as polyethylene glycol, polypropylene glycol, polyethylene glycol monoether, and polypropylene glycol monoether; monoalkyltriphenyl ether, alkyldiphenyl ether, dialkyldiphenyl ether, pentaphenyl ether, tetraphenyl ether, and monoalkyl. Phenyl ether-based oils such as tetraphenyl ether and dialkyl tetraphenyl ether; and the like.
  • the fatty acid constituting the fatty acid ester is preferably a fatty acid having 8 to 22 carbon atoms, and specifically, caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, bechenic acid, erucic acid, and palmitrain. Examples thereof include acids, oleic acid, linoleic acid, linolenic acid, isostearic acid, araquinic acid, myristic acid, and 12-hydroxystearic acid.
  • Specific examples of the fatty acid ester include glycerin fatty acid ester, polyglycerin fatty acid ester, and propylene glycol fatty acid ester.
  • glycerin fatty acid ester examples include glycerin monooleate, glycerin monostearate, glycerin monocaprelate, glycerin dioleate, glycerin distearate, and glycerin dicaprelate.
  • polyglycerin fatty acid ester examples include diglycerin monooleate, diglycerin monoisostearate, diglycerin dioleate, diglycerin trioleate, diglycerin monostearate, diglycerin distearate, and diglycerin tristearate.
  • propylene glycol fatty acid ester examples include propylene glycol monooleate, propylene glycol monostearate, propylene glycol monocaprelate, and propylene glycol monolaurylate.
  • Vegetable oils are oils derived from plants, and specifically, rapeseed oil, peanut oil, corn oil, cottonseed oil, canola oil, soybean oil, sunflower oil, palm oil, coconut oil, and Benibana oil. Examples include camellia oil, olive oil, and corn oil.
  • animal oils are oils derived from animals, and specific examples thereof include lard, neatsfoot oil, sardine oil, sardine oil, and herring oil.
  • liquid paraffin examples include alicyclic hydrocarbon compounds having a branched structure and a ring structure represented by C m H n (m is the number of carbon atoms and n ⁇ 2 m + 2) or a mixture thereof.
  • the base oil (A) contained in the grease composition of one aspect of the present invention is classified into Group 3 of the API base oil category from the viewpoint of affinity with the nanofiber (B). It preferably contains one or more selected from mineral oils, synthetic oils, vegetable oils, animal oils, fatty acid esters, and liquid paraffins, and is selected from mineral oils and synthetic oils classified in Group 3 of the API base oil category. It is more preferable to use one or more of them.
  • the synthetic oil it is preferable to use poly- ⁇ -olefin (PAO).
  • PAO poly- ⁇ -olefin
  • the grease composition is required to have oxidative stability at a high temperature, it is preferable to use a synthetic oil, and one or more selected from hydrocarbon oils, ester oils, and ether oils may be used.
  • hydrocarbon-based oil is further preferable. Further, by using a mixture of hydrocarbon oil, ester oil, and ether oil, heat resistance, sealing resistance, and low temperature characteristics can be balanced, and from this viewpoint, hydrocarbon oil is used. Is preferable.
  • the base oil (A) used in one embodiment of the present invention has a kinematic viscosity at 40 ° C. (hereinafter, also referred to as “40 ° C. kinematic viscosity”), preferably 10 to 400 mm 2 / s, more preferably 15 to 300 mm 2 / s. s, more preferably 20 to 200 mm 2 / s, even more preferably 20 to 130 mm 2 / s.
  • 40 ° C. kinematic viscosity preferably 10 to 400 mm 2 / s, more preferably 15 to 300 mm 2 / s. s, more preferably 20 to 200 mm 2 / s, even more preferably 20 to 130 mm 2 / s.
  • the base oil (A) used in one embodiment of the present invention may be a mixed base oil in which the kinematic viscosity is adjusted within the above range by combining the low viscosity base oil (A1) and the high viscosity base oil (A2). .
  • kinematic viscosity is preferably 5 ⁇ 150mm 2 / s, more preferably 7 ⁇ 120mm 2 / s, more preferably 10 ⁇ 100mm 2 / s.
  • kinematic viscosity is preferably 200 ⁇ 1000mm 2 / s, more preferably 250 ⁇ 800mm 2 / s, more preferably 300 ⁇ 600mm 2 / s.
  • the base oil (A) used in one aspect of the present invention has a viscosity index of preferably 60 or more, more preferably 70 or more, and even more preferably 80 or more.
  • the 40 ° C. kinematic viscosity and the viscosity index mean values measured or calculated in accordance with JIS K2283: 2000.
  • the content of the base oil (A) contained in the grease composition of one aspect of the present invention is preferably 50% by mass or more, more preferably 60% by mass or more, based on the total amount (100% by mass) of the grease composition. , More preferably 70% by mass or more, and even more preferably 80% by mass or more.
  • the nanofiber (B) contained in the grease composition of the present invention is one or more selected from cellulose nanofiber (B1) and modified cellulose nanofiber (B2).
  • the nanofibers (B) are uniformly dispersed in the grease composition to form a higher-order structure. Since the nanofibers (B) are excellent in mechanical stability, the higher-order structure of the nanofibers (B) is stable against shearing. Therefore, the shear stability of the grease composition is improved, and the grease leakage prevention performance is improved.
  • the miscibility of the grease composition can be adjusted within an appropriate range. Therefore, the ratio of the base oil (A) to the grease composition can be increased. Therefore, the lubricity of the grease composition is improved, and the energy transfer efficiency is likely to be improved.
  • Cellulose nanofibers mean fibrous materials having a thickness of 500 nm or less, which are produced by defibrating plant fibers to the nano level, and are distinguished from flakes, powders, and particulate matter.
  • Lignocellulose can also be used as a raw material for cellulose nanofibers.
  • Lignocellulose is a complex hydrocarbon polymer that constitutes the cell wall of plants, and is known to be mainly composed of polysaccharide cellulose, hemicellulose, and lignin, which is an aromatic polymer.
  • the cellulose constituting the cellulose nanofiber may be one or more selected from lignocellulose and acetylated lignocellulose.
  • the cellulose nanofibers may contain one or more selected from hemicellulose and lignin.
  • the cellulose constituting the cellulose nanofibers may be chemically bonded to one or more selected from hemicellulose and lignin.
  • the degree of polymerization of the cellulose constituting the cellulose nanofibers is preferably 50 to 3,000, more preferably 100 to 1,500, still more preferably 150 to 1,000, and even more preferably 200 to 800.
  • the degree of polymerization of cellulose means the value measured by the viscosity method.
  • the modified cellulose nanofibers are those obtained by subjecting the cellulose nanofibers to a modification treatment.
  • Specific examples of the modification treatment include esterification such as acetylation, phosphorylation, urethanization, carbamidation, etherification, carboxymethylation, and TEMPO (2,2,6,6-tetramethylpiperidin-1-oxyl radical). ) Oxidation, periodic acid oxidation and the like.
  • the modified cellulose nanofiber used in the present invention may be subjected to only one of these modification treatments, or may be subjected to two or more of these modification treatments.
  • resin reinforcing fibers containing one or more selected from cellulose nanofibers and modified cellulose nanofibers and a thermoplastic resin are known. Such resin reinforcing fibers are also included in the modified cellulose nanofibers.
  • One or more selected from the cellulose nanofibers and the modified cellulose nanofibers and the thermoplastic resin may be mixed or kneaded, or may be dispersed with each other.
  • Thermoplastic resins include polyethylene, polypropylene, polyvinyl chloride, polystyrene, polyvinylidene chloride, fluororesin, (meth) acrylic resin, polyamide resin, polyester, polylactic acid resin, polylactic acid and polyester copolymer resin, and acrylonitrile-butadiene.
  • thermoplastic resin means acrylic and / or methacrylic.
  • thermoplastic resin may be used alone, or two or more types may be used in combination.
  • Thickness of nanofiber (B) The definition of "thickness” of nanofiber (B) is the same as the definition of the thickness of a general fibrous material. Specifically, in the cut surface when cut perpendicular to the tangential direction at an arbitrary point on the side surface of the nanofiber (B), if the cut surface is a circle or an ellipse, the diameter or major axis is the nanofiber. It is the “thickness” of (B). If the cut surface is a polygon, the diameter of the circumscribed circle of the polygon is the “thickness" of the nanofiber (B).
  • micro-size particles When a flake-like substance, a powder-like substance, or a particulate matter (hereinafter, also referred to as "micro-size particles") having a size of several ⁇ m or more is blended in the base oil (A) as a thickener, the base oil In (A), micro-sized particles are likely to aggregate and form so-called "lumps". As a result, agglomerates of micro-sized particles are deposited on the surface of the obtained grease composition, and the dispersed state tends to be non-uniform. In this case, in order to increase the miscibility of the obtained grease composition, it is necessary to add a large amount of micro-sized particles. However, since it contains particles larger than the oil film thickness, the grease composition has inferior wear resistance.
  • the nanofibers (B) having a thickness (d) of 1 to 500 nm are blended in the base oil (A), the nanofibers (in the base oil (A)) ( A higher-order structure is formed by the nanofibers (B) while the nanofibers (B) are uniformly dispersed without agglomeration of the nanofibers (B).
  • a grease composition having an appropriate miscibility can be obtained even though the content of the nanofibers (B) is small.
  • the "thickness (d) of the nanofibers (B)” indicates the thickness of the nanofibers (B) dispersed in the base oil (A), and is blended in the base oil (A). It is distinguished from the “thickness (d') of nanofiber (B)” as a raw material before the invention. However, the “thickness (d) of the nanofiber (B)” dispersed in the base oil (A) and the “nanofiber (B)” as a raw material before being blended in the base oil (A) There is almost no difference from “thickness (d')”.
  • the “thickness (d')” can also be regarded as substantially the same.
  • the thickness (d) of the nanofibers (B) dispersed in the base oil (A) is 1 to 500 nm, but the nanofibers (B) form a higher-order structure in the base oil (A). From the viewpoint of more uniformly dispersing the nanofibers (B), the thickness is preferably 1 to 300 nm, more preferably 1 to 200 nm, still more preferably 2 to 100 nm.
  • nanofibers (B) contained in the grease composition of the present invention it is sufficient that at least the dispersion of the nanofibers (B) having a thickness (d) in the above range is confirmed, and the thickness (d) is the above. Nanofibers (B) out of range may be dispersed.
  • the average value of the thickness (d) of 10 nanofibers (B) arbitrarily selected from the nanofibers (B) dispersed in the base oil (A) is more preferably 1 to 300 nm than 1 to 500 nm.
  • the number of nanofibers (B) having a thickness (d) in the above range is determined. It is preferable that there are 5 or more, more preferably 7 or more of the nanofibers (B), and all of the selected 10 nanofibers (B) in thickness (d) are in the above range. ) Is more preferable.
  • the aspect ratio of the nanofiber (B) is preferably 5 or more, more preferably 10 or more, still more preferably 15 or more, still more preferably 30 or more, still more preferably 50. As mentioned above, it is more preferably 70 or more, even more preferably 90 or more, and even more preferably 100 or more.
  • the “aspect ratio” is the ratio (length / thickness) of the length to the thickness of the nanofiber (B) to be observed, and is referred to as the "length” of the nanofiber (B). Refers to the distance between the two most distant points of the nanofiber (B).
  • the thickness of the nanofiber (B) to be observed is thicker. It suffices that the length of only the portion where the sag can be measured is measured, and the aspect ratio of the portion is within the above range. Further, among the nanofibers (B) contained in the grease composition of the present invention, the average value of the aspect ratios of 10 arbitrarily selected nanofibers (B) (hereinafter, also referred to as “average aspect ratio”) is 5.
  • the above is preferable, more preferably 10 or more, still more preferably 15 or more, still more preferably 30 or more, still more preferably 50 or more, still more preferably 70 or more, even more preferably 90 or more, even more preferably. It is 100 or more.
  • the thickness (d') of the nanofiber (B) as a raw material before being blended with the base oil (A) is preferably 1 to 500 nm, more preferably 1 to 300 nm, still more preferably 1 to 200 nm, and further. It is preferably 2 to 100 nm.
  • the average aspect ratio of the nanofiber (B) as a raw material before being mixed with the base oil (A) is preferably 5 or more, more preferably 10 or more, still more preferably 15 or more, still more preferably 30 or more. It is even more preferably 50 or more, even more preferably 70 or more, even more preferably 90 or more, and even more preferably 100 or more.
  • the "thickness (d)" of the nanofibers (B) dispersed in the base oil (A) and the nanofibers as a raw material before being blended in the base oil (A) are values measured using an electron microscope or the like.
  • the grease composition according to one aspect of the present invention has miscibility adjusted to an appropriate range even when the content of nanofibers (B) is small.
  • the content of the nanofibers (B) is preferably 0.1 to 20% by mass based on the total amount (100% by mass) of the grease composition. More preferably 0.5 to 18% by mass, still more preferably 0.8 to 15% by mass, still more preferably 1.0 to 12% by mass, still more preferably 1.0 to 10% by mass, still more preferably 1. It is 0.0 to 9.0 mass%.
  • the content of the nanofiber (B) is 0.1% by mass or more, it is easy to prepare a grease composition having a high dropping point.
  • the content of the nanofiber (B) is 20% by mass or less, it is easy to prepare a grease composition having excellent wear resistance. Further, by adjusting the content of the nanofiber (B) within the above range, the miscibility of the grease composition can be easily adjusted within an appropriate range.
  • the grease composition of one aspect of the present invention preferably further contains organic bentonite (C) in addition to the base oil (A) and nanofibers (B).
  • the nanofibers (B) preferably contain cellulose nanofibers (B1). As described above, when the grease composition contains the nanofibers (B), the nanofibers (B) are uniformly dispersed in the grease composition to form a higher-order structure. When the nanofibers (B) contain cellulose nanofibers (B1), the cellulose nanofibers (B1) are also uniformly dispersed in the grease composition to form a higher-order structure.
  • the hydrophilic surface (the surface having a hydrophilic group) adsorbs the hydrophilic group of the cellulose nanofiber (B1), and the hydrophilic surface is the hydrophilic group of the cellulose nanofiber (B1).
  • the cellulose nanofibers (B1) are dispersed in the vicinity of the uniformly dispersed cellulose nanofibers (B1).
  • the organic bentonite (C) is uniformly dispersed and arranged as if it surrounds the hydrophilic group of the cellulose nanofiber (B1).
  • the nanofiber (B) is excellent in mechanical stability.
  • Cellulose nanofibers (B1) are also excellent in mechanical stability.
  • organic bentonite (C) is also excellent in mechanical stability. Therefore, the higher-order structure of nanofibers (B) (cellulose nanofibers (B1)) and the organic bentonite (C) dispersed in the grease composition are stable against shearing. Therefore, the shear stability of the grease composition is improved, and the grease leakage prevention performance is improved. Further, since the cellulose nanofibers (B1) and the organic bentonite (C) can be easily dispersed uniformly in the base oil (A), the content of the cellulose nanofibers (B1) is small and the organic bentonite (C) Since the grease composition having an appropriate mixing consistency can be obtained even if the content of is small, the ratio of the base oil (A) to the grease composition can be increased.
  • the lubricity of the grease composition is improved, and the energy transfer efficiency is likely to be improved. Since the organic bentonite (C) is uniformly dispersed and arranged so as to surround the hydrophilic group of the cellulose nanofiber (B1), the cellulose nanofiber (B1) is pseudo-hydrophobicized and the grease composition is formed. Is provided with excellent water resistance.
  • the content of organic bentonite (C) is small means that the content of organic bentonite (C) is 0.01 to 15% by mass based on the total amount (100% by mass) of the grease composition. This means that it is preferably 0.1 to 10% by mass, and more preferably 1.0 to 8.0% by mass.
  • the content of organic bentonite is 0.01% by mass or more, it is easy to prepare a grease composition having better water resistance.
  • the content of organic bentonite is 15% by mass or less, it is easy to prepare a grease composition having excellent energy transfer efficiency.
  • the grease composition of one aspect of the present invention contains organic bentonite (C)
  • cellulose nanofibers (B1) are used from the viewpoint of maximizing the effect produced by containing the organic bentonite (C).
  • the total content of the base oil (A), the nanofibers (B), and the organic bentonite (C) is preferably based on the total content (100% by mass) of the grease composition. Is 50% by mass or more, more preferably 60% by mass or more, still more preferably 70% by mass or more, still more preferably 80% by mass or more, still more preferably 90% by mass or more.
  • the grease composition of one aspect of the present invention contains cellulose nanofibers (B1) and organic bentonite (C) from the viewpoint of making the grease composition excellent in leakage prevention performance and energy transfer efficiency and also excellent in water resistance.
  • the ratio [(B1) / (C)] is preferably 0.05 to 5.0, more preferably 0.1 to 2.0, and further preferably 0.1 to 1.0 in terms of mass ratio.
  • Organic bentonite (C) is obtained by modifying the crystal surface of montmorillonite, which is a viscous mineral, by treating it with a quaternary ammonium compound or the like.
  • the quaternary ammonium compound is not particularly limited as long as it can modify the crystal surface of montmorillonite, which is a viscous mineral.
  • dimethylalkylammonium such as dimethyldioctadecylammonium
  • trimethylalkylammonium such as trimethyloctadecylammonium
  • trialkyl examples thereof include benzylammonium, and among these, dimethylalkylammonium such as dimethyldioctadecylammonium is preferable.
  • the quaternary ammonium compound may be used alone or in combination of two or more. Further, the organic bentonite (C) may be used alone or in combination of two or more.
  • Organic bentonite (C) generally cleaves in the base oil by shearing in the presence of polar compounds and functions as a thickener.
  • bentonite such as organic bentonite
  • a grease composition (bentonite grease) using bentonite as a thickener is usually mixed with a large amount of bentonite to adjust the miscibility.
  • bentonite is generally blended in an amount of 18% by mass or more, more preferably 20% by mass or more, based on the total amount (100% by mass) of the grease composition.
  • the organic bentonite (C) is uniformly dispersed in the base oil by using the cellulose nanofibers (B1) and the organic bentonite (C) in combination. It is possible.
  • the method for producing organic bentonite is disclosed in detail in, for example, JP-A-62-83108 and JP-A-53-72792.
  • various additives to be blended in a general grease composition may be contained as long as the effects of the present invention are not impaired.
  • the various additives include extreme pressure agents, rust inhibitors, antioxidants, cleaning dispersants, corrosion inhibitors, defoamers, metal deactivators and the like.
  • each of these various additives may be used alone, or two or more kinds may be used in combination.
  • the dispersant and water used in the grease formation may be contained as long as the grease state can be maintained.
  • the dispersant include compounds exemplified in the method for producing a grease composition of the present invention described later.
  • the total content of the dispersant and water is preferably 0 to 60% by mass, more preferably 0 to 30% by mass, based on the total amount (100% by mass) of the grease. , More preferably 0 to 10% by mass, and even more preferably 0 to 5% by mass.
  • Examples of the extreme pressure agent include one or more selected from a phosphorus-based extreme pressure agent and a sulfur-phosphorus-based extreme pressure agent.
  • Phosphorus-based extreme pressure agents include one or more phosphates selected from orthophosphates, hydrogen phosphates, polyphosphates, phosphites, and metaphosphates.
  • Examples of the polyphosphate include pyrophosphate (diphosphate), tripolyphosphate, tetrapolylate and the like.
  • the phosphate is preferably an alkali metal salt.
  • Preferred examples of the alkali metal salt include sodium salt, potassium salt and lithium salt, and sodium salt is particularly preferable.
  • sulfur-phosphorus extreme pressure agent examples include one or more selected from a thiophosphate ester and an amine salt of a thiophosphate ester.
  • thiophosphate ester examples include monothiophosphate ester, dithiophosphate ester, trithiophosphate ester, monothiophosphate ester, dithiophosphate ester, trithiophosphate ester, and the like. Among these, trithiophosphate ester is used. Is preferable.
  • trithiophosphate ester examples include tributylphosphorothionate, tripentylphosphorothionate, trihexylphosphorothionate, triheptylphosphorothionate, trioctylphosphorothionate, trinonylphosphorothionate, and tri.
  • Trialkylphosphorothionates such as decylphosphorothionate, triundecylphosphorothionate, tripentadecylphosphorothionate, trihexadecylphosphorothionate; triphenylphosphorothionate, tricresylphosphoro Triarylphosphorothionates such as thionate and trixylenyl phosphorothionate; tris (n-propylphenyl) phosphorothionate, tris (isopropylphenyl) phosphorothionate, tris (n-butylphenyl) phosphoro Thionate, Tris (isobutylphenyl) phosphorothionate, Tris (s-butylphenyl) phosphorothionate, Tris (t-butylphenyl) phosphorothionate, Tris (2,4-C 9 , C 10 isoalkylphenol) ) Tris (alkylphenyl
  • the amine salt of the thiophosphate ester examples include the amine salt of the thiophosphate ester exemplified above.
  • the content of the extreme pressure agent contained in the grease composition of one aspect of the present invention is preferably 0.01 to 5.0% by mass, more preferably 0, based on the total amount (100% by mass) of the grease composition. .1 to 3.0% by mass, more preferably 0.5 to 2.0% by mass.
  • the extreme pressure agent other than the above-mentioned extreme pressure agent examples include organic molybdenum.
  • the grease composition of one aspect of the present invention preferably has a low content of molybdenum atoms. Specifically, the content of molybdenum atoms is preferably less than 50% by mass, more preferably less than 10% by mass, still more preferably 1% by mass, based on the total amount (100% by mass) of the grease composition. Less than, and even more preferably, no molybdenum atom.
  • the rust preventive examples include a carboxylic acid-based rust preventive, an amine-based rust preventive, a carboxylate-based rust preventive, and the like.
  • the content of the rust preventive is preferably 0.1 to 10. Based on the total amount (100% by mass) of the grease composition. It is 0% by mass, more preferably 0.3 to 8.0% by mass, and even more preferably 1.0 to 5.0% by mass.
  • antioxidant examples include amine-based antioxidants, phenol-based antioxidants, sulfur-based antioxidants, zinc dithiophosphate and the like.
  • the content of the antioxidant is preferably 0.05 to 10% by mass based on the total amount (100% by mass) of the grease composition. %, More preferably 0.1 to 7% by mass, still more preferably 0.2 to 5% by mass.
  • each content of these additives is preferably 0.01 based on the total amount (100% by mass) of the grease composition. It is about 20% by mass, more preferably 0.1 to 10% by mass, still more preferably 0.2 to 5% by mass.
  • the miscibility of the grease composition of one aspect of the present invention at 25 ° C. is preferably 220 to 440, more preferably 240 to 400, still more preferably 250 to 380, and even more preferably 270 to 360.
  • the grease composition of one aspect of the present invention has excellent leakage prevention performance, energy transfer efficiency and leakage prevention performance even when the miscibility at 25 ° C. is adjusted to the above range. It becomes a thing.
  • the change in miscibility in the roll stability test measured and calculated by the method described in Examples described later is preferably 50 or less, more preferably 40 or less, still more preferably. It is 30 or less, more preferably 20 or less.
  • the torque transfer efficiency which is an index of energy transfer efficiency, measured and calculated by the method described in Examples described later for the grease composition of one aspect of the present invention is preferably 60.0% or more, more preferably 63. It is 0% or more, more preferably 66.0% or more.
  • the method for producing the grease composition of the present invention is not particularly limited, but has, for example, the following step (1), and the step (2) is carried out as necessary.
  • -Step (1) A step of preparing a mixed solution in which nanofibers (B) having a thickness (d') of 1 to 500 nm are dispersed in a base oil (A)
  • -Step (2) Unnecessary from the mixed solution The process of removing various components.
  • the nanofiber (B) is one or more selected from cellulose nanofibers (B1) and modified cellulose nanofibers (B2).
  • the grease composition obtained through such a step has a thickness (d) of 1 to 500 nm in a state where aggregation of nanofibers (B) is suppressed in the base oil (A) and the fiber shape is maintained. Nanofibers can be dispersed. As a result, a higher-order structure made of nanofibers (B) is formed in the base oil, and the nanofibers (B) can be uniformly dispersed in the base oil (A). Therefore, by adding a small amount of nanofibers (B), a grease composition having an appropriate miscibility can be prepared, and a grease composition having excellent both leakage prevention performance and energy transfer efficiency can be obtained.
  • steps (1) and (2) will be described.
  • the step (S1a) is a step of preparing a mixed solution in which nanofibers (B) having a thickness (d') of 1 to 500 nm are dispersed in the base oil (A).
  • the details of the nanofiber (B) and the base oil (A) used in the step (S1a) are as described above.
  • the "thickness (d')” here indicates the thickness of the nanofiber (B) as a raw material before being blended in the base oil (A), and is “thick”.
  • the preferred range of "sa (d')” is the same as above.
  • the nanofibers (B) may be powdered cellulose nanofibers dispersible in water, an organic solvent, or a base oil (A), or water, an organic solvent, or a base oil ( The dispersion liquid dispersed in A) may be used. Alternatively, shearing may be applied in the base oil (A) to form nanofibers.
  • these dispersions containing the nanofibers (B) are used.
  • the solid content concentration is usually 0.1 to 70% by mass, preferably 0.1 to 65% by mass, more preferably 0.1 to 60% by mass, based on the total amount (100% by mass) of the dispersion. It is preferably 0.5 to 55% by mass, and even more preferably 1.0 to 50% by mass.
  • nanofibers (B) are blended in water or an organic solvent, and when the water dispersion liquid is used, a dispersant or the like is blended as necessary, and the mixture is sufficiently stirred manually or by a stirrer. Can be prepared.
  • Dispersants include aprotonic polar solvents such as N, N-dimethylformamide (DMF), N, N-dimethylacetamide (DMAc), and N-methylpyrrolidone (NMP); propanol, ethylene glycol, propylene glycol, and Alcohols such as hexylene glycol; one or more selected from surfactants such as polyglycerin fatty acid ester, sucrose fatty acid ester, citrate monoglyceride, diacetyl tartrate monoglyceride, polyoxyethylene sorbitanoic acid ester, and sorbitan acid ester are preferable. ..
  • aprotonic polar solvents such as N, N-dimethylformamide (DMF), N, N-dimethylacetamide (DMAc), and N-methylpyrrolidone (NMP); propanol, ethylene glycol, propylene glycol, and Alcohols such as hexylene glycol; one or more selected from surfactants
  • the blending amount of the dispersant in the mixed solution prepared in the step (S1a) is preferably 0.1 to 50% by mass, more preferably based on the total amount (100% by mass) of the mixed solution. Is 0.5 to 40% by mass, more preferably 1.0 to 30% by mass, still more preferably 1.0 to 20% by mass, and even more preferably 1.0 to 10% by mass.
  • the blending amount of water or the organic solvent in the mixed solution prepared in the step (S1a) is preferably 1 to 1 based on the total amount (100% by mass) of the mixed solution. It is 60% by mass, more preferably 3 to 50% by mass, and even more preferably 5 to 40% by mass.
  • the blending amount ratio (water / dispersion solvent) of water and the dispersion solvent in the mixed solution prepared in the step (S1a) is preferably 0.01 to 600 in terms of mass ratio. It is more preferably 0.05 to 400, still more preferably 0.1 to 300, and even more preferably 0.2 to 200.
  • the mixed solution in which the nanofibers (B) having a thickness (d') of 1 to 500 nm are dispersed in the base oil (A) is such that the nanofibers (B) are directly dispersed in the base oil (A). It can also be prepared by applying shear to the nanofiber raw material in oil (A) to form nanofibers.
  • the step (2) is a step of removing unnecessary components from the mixed solution prepared in the step (1).
  • the unnecessary component is one or more selected from water, an organic solvent, and a dispersant in the mixed solution. However, these components do not necessarily have to be completely removed if the grease composition can maintain the grease state.
  • a method for removing one or more selected from water, an organic solvent, and a dispersant in the mixed solution a method of heating the mixed solution and removing it by evaporation is preferable.
  • a temperature range is set in consideration of one or more boiling points selected from an organic solvent and a dispersant in an environment where the pressure is 0.001 to 0.1 MPa, and the mixture is heated. Is preferable.
  • the heating temperature is, for example, 0 to 100 ° C.
  • the grease composition is prepared by the step (2).
  • the organic bentonite (C) and other additives are mixed with the mixed solution in the step (1).
  • a treatment such as homogenization may be performed using a roll mill or the like.
  • the grease composition of the present invention is excellent in both leakage prevention performance and energy transfer efficiency. Therefore, the grease composition of one aspect of the present invention can be suitably used for a speed reducer provided in an industrial robot or the like and a speed increaser provided in a wind power generation facility. Examples of the speed reducer and speed increaser include a speed reducer having a gear mechanism and a speed increaser having a gear mechanism.
  • the application target of the grease composition of one aspect of the present invention is not limited to a speed reducer composed of a gear mechanism and a speed increaser composed of a gear mechanism, and can be applied to, for example, a traction drive.
  • a speed reducer or a speed increaser having the grease composition of the present invention at a lubrication site.
  • the grease composition of the present invention provides a lubrication method for lubricating a lubricated portion of a speed reducer or a speed increaser.
  • the nanofiber (B) has a low environmental load and is excellent in safety to the human body. Therefore, the grease composition of the present invention can be suitably used for a food machine equipped with a speed reducer, a food machine equipped with a speed increaser, and the like.
  • organic bentonite (C) also has a low environmental load and is excellent in safety to the human body. Therefore, the grease composition of one aspect of the present invention containing the organic bentonite (C) can also be suitably used for a food machine provided with a speed reducer, a food machine provided with a speed increaser, and the like.
  • a food machine provided with a speed reducer or a speed increaser having the grease composition of the present invention at a lubrication site.
  • the grease composition of the present invention provides a lubrication method for lubricating a lubricated portion of a food machine including a speed reducer or a speed increaser.
  • ⁇ Base oil (A)> A low-viscosity base oil (A1) and a high-viscosity base oil (A2) were combined to prepare a mixed base oil having a kinematic viscosity of 60 mm 2 / s at 40 ° C. and a viscosity index of 135.
  • -Organic bentonite C: Elementis Specialties, Inc., product name "BARAGEL (registered trademark) 3000” ⁇ Lithium stearate ⁇ Aluminum stearate
  • Example 1 75 parts by mass of the dispersion liquid of cellulose nanofibers (B1) (of which CNF amount: 7.5 parts by mass), 89.7 parts by mass of the base oil (A), and 0.8 parts by mass of the dispersant are mixed and 25.
  • Example 2 40 parts by mass of the dispersion liquid of cellulose nanofibers (B1) (of which CNF amount: 4.0 parts by mass), 84.8 parts by mass of the base oil (A), and 0.4 parts by mass of the dispersant are mixed and 25.
  • a mixed solution was prepared by sufficiently stirring at ° C. Then, the mixed solution was heated to 150 ° C., and water was evaporated and removed from the mixed solution. Then, after cooling to room temperature (25 ° C.), 8.8 parts by mass of organic bentonite (C), 1.0 part by mass of phosphorus-based extreme pressure agent, 0.5 part by mass of sulfur-phosphorus-based extreme pressure agent, and 0 antioxidant.
  • Example 2 After adding 5.5 parts by mass to the mixed solution and sufficiently stirring the mixture, homogenization treatment was carried out using a three-roll mill to prepare a grease composition having the formulation shown in Example 2 in Table 1.
  • (B1) / (C) 0.45 (mass ratio).
  • Example 4 28 parts by mass of the dispersion liquid of cellulose nanofibers (B1) (of which CNF amount: 2.8 parts by mass), 88.4 parts by mass of the base oil (A), and 0.3 parts by mass of the dispersant are mixed and 25.
  • a mixed solution was prepared by sufficiently stirring at ° C. Then, the mixed solution was heated to 150 ° C., and water was evaporated and removed from the mixed solution. Then, after cooling to room temperature (25 ° C.), 6.5 parts by mass of organic bentonite (C), 1.0 part by mass of phosphorus-based extreme pressure agent, 0.5 part by mass of sulfur-phosphorus-based extreme pressure agent, and 0 antioxidant.
  • Example 4 After adding 5.5 parts by mass to the mixed solution and sufficiently stirring the mixture, homogenization treatment was carried out using a three-roll mill to prepare a grease composition having the formulation shown in Example 4 of Table 1.
  • (B1) / (C) 0.43 (mass ratio).
  • FIG. 1 is a schematic view of an apparatus used for measuring torque transfer efficiency as an index of energy transfer efficiency in this embodiment.
  • the measuring device 100 shown in FIG. 1 includes an input side motor unit 111, an input side torque measuring device 112, an input side speed reducer 113 (manufactured by Harmonic Drive Systems Co., Ltd., product name “CSG-40-100-2UH”), and an output side.
  • the torque measuring instrument 122, the output side speed reducer 123 manufactured by Nabtesco Co., Ltd., product name "RV-125V"
  • the output side motor unit 121 are connected in this order.
  • the grease-filled case (case temperature: 30 ° C.) of the input-side speed reducer 113 of the measuring device 1 shown in FIG. 1 is filled with 140 g of mixed grease and measured under the conditions of a load torque of 240 Nm and an input-side rotation speed of 1600 rpm.
  • the device 100 was operated, the number of rotations and the torque on the input side and the output side were measured, the torque transmission efficiency was calculated from the following formula (1), and the energy transmission efficiency was evaluated.
  • (Torque transmission efficiency (%)) (output side torque (Nm)) / [(input side torque (Nm)) x (reduction ratio)] x 100 ... (1)
  • the reduction ratio is 100.
  • the torque transmission efficiency is an index indicating the amount of energy lost before the input energy is output. The lower the torque transmission efficiency, the larger the energy loss, and conversely, the higher the torque transmission efficiency, the smaller the energy loss. ..
  • the grease compositions of Examples 1 to 5 have an appropriate miscibility and are excellent in shear stability and energy transfer efficiency. Therefore, it can be seen that the grease composition is excellent in leakage prevention performance and energy transfer efficiency.
  • the grease composition containing organic bentonite without blending nanofibers (B) has appropriate miscibility, but has shear stability and energy transfer. It turns out to be inferior in efficiency.
  • a grease composition using lithium stearate or aluminum stearate as a thickener has an appropriate mixing consistency, but has shear stability and energy transfer efficiency. It turns out that it is inferior to.
  • Example 1 as a result of confirming whether or not the thickness of the cellulose nanofibers (B1) changed before and after the preparation of the grease composition, it was confirmed that the thickness hardly changed before and after the production. From this, the "thickness (d) of nanofiber (B)" dispersed in the base oil and the “thickness (d) of nanofiber (B)” as a raw material before being blended in the base oil. There is almost no difference between') ”and these can be regarded as substantially the same.

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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)
  • Dispersion Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Lubricants (AREA)

Abstract

La présente invention aborde le problème de la fourniture d'une composition de graisse pour réducteurs de vitesse et multiplicateurs de vitesse, qui présente à la fois d'excellentes performances de prévention de fuite et une excellente efficacité de transmission d'énergie ; et la présente invention concerne une composition de graisse qui contient (A) une huile de base et (B) des nanofibres ayant un diamètre (d) de 1 à 500 nm, et qui est utilisée pour des réducteurs de vitesse et des multiplicateurs de vitesse. Cette composition de graisse est conçue de telle sorte que les nanofibres (B) sont composées de nanofibres de cellulose (B1) et/ou de nanofibres de cellulose (B2) modifiées.
PCT/JP2020/007973 2019-03-22 2020-02-27 Composition de graisse WO2020195509A1 (fr)

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US17/437,155 US20220145207A1 (en) 2019-03-22 2020-02-27 Grease composition
JP2021508852A JPWO2020195509A1 (fr) 2019-03-22 2020-02-27
CN202080022892.9A CN113631692A (zh) 2019-03-22 2020-02-27 润滑脂组合物
EP20777316.9A EP3943583A4 (fr) 2019-03-22 2020-02-27 Composition de graisse

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CN112175702A (zh) * 2020-10-20 2021-01-05 武汉博达特种润滑技术有限公司 一种用于微型电机减速箱的润滑脂组合物及其制备方法

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JP2017210612A (ja) * 2016-05-19 2017-11-30 Ntn株式会社 グリース組成物および転動装置
JP2018193524A (ja) * 2017-05-22 2018-12-06 出光興産株式会社 グリース組成物、及び精密減速機
WO2019189239A1 (fr) * 2018-03-30 2019-10-03 出光興産株式会社 Composition de graisse, composant de mécanisme et procédé de production de composition de graisse

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JP5258170B2 (ja) * 2006-05-02 2013-08-07 東レ・ダウコーニング株式会社 潤滑グリース組成物
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Publication number Priority date Publication date Assignee Title
JPS5372792A (en) 1976-12-10 1978-06-28 Nl Industries Inc Organophilic clay having high dispersion
JPS6283108A (ja) 1985-10-09 1987-04-16 サザン　クレイ　プロダクツ、インク． 高ゲル化性オルガノクレ−の製造方法
WO2016175258A1 (fr) * 2015-04-30 2016-11-03 出光興産株式会社 Graisse, composant mécanique, et procédé de production de graisse
JP2017082024A (ja) * 2015-10-22 2017-05-18 出光興産株式会社 グリース、機構部品、グリースの使用方法、及びグリースの製造方法
JP2017180526A (ja) * 2016-03-28 2017-10-05 セイコーエプソン株式会社 ロボット、歯車装置および歯車装置の製造方法
JP2017210612A (ja) * 2016-05-19 2017-11-30 Ntn株式会社 グリース組成物および転動装置
JP2018193524A (ja) * 2017-05-22 2018-12-06 出光興産株式会社 グリース組成物、及び精密減速機
WO2019189239A1 (fr) * 2018-03-30 2019-10-03 出光興産株式会社 Composition de graisse, composant de mécanisme et procédé de production de composition de graisse

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EP3943583A1 (fr) 2022-01-26
JPWO2020195509A1 (fr) 2020-10-01
US20220145207A1 (en) 2022-05-12
EP3943583A4 (fr) 2022-12-07

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