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WO2012001760A1 - グリース組成物及び機械部品 - Google Patents

グリース組成物及び機械部品 Download PDF

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Publication number
WO2012001760A1
WO2012001760A1 PCT/JP2010/060983 JP2010060983W WO2012001760A1 WO 2012001760 A1 WO2012001760 A1 WO 2012001760A1 JP 2010060983 W JP2010060983 W JP 2010060983W WO 2012001760 A1 WO2012001760 A1 WO 2012001760A1
Authority
WO
WIPO (PCT)
Prior art keywords
grease composition
fatty acid
rust
sulfonate
salt
Prior art date
Application number
PCT/JP2010/060983
Other languages
English (en)
French (fr)
Inventor
憲一郎 松原
照 吉成
亮 相田
今井　淳一
Original Assignee
協同油脂株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 協同油脂株式会社 filed Critical 協同油脂株式会社
Priority to KR1020157010801A priority Critical patent/KR20150051241A/ko
Priority to KR1020157010803A priority patent/KR20150052358A/ko
Priority to CN201080067789.2A priority patent/CN102985520B/zh
Priority to US13/807,604 priority patent/US9909080B2/en
Priority to PCT/JP2010/060983 priority patent/WO2012001760A1/ja
Priority to KR1020127034047A priority patent/KR20130044243A/ko
Priority to DE112010005707.9T priority patent/DE112010005707B4/de
Publication of WO2012001760A1 publication Critical patent/WO2012001760A1/ja

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M135/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing sulfur, selenium or tellurium
    • C10M135/08—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing sulfur, selenium or tellurium containing a sulfur-to-oxygen bond
    • C10M135/10—Sulfonic acids or derivatives thereof
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • 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
    • 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
    • C10M129/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen
    • C10M129/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing oxygen having a carbon chain of less than 30 atoms
    • C10M129/26—Carboxylic acids; Salts thereof
    • C10M129/28—Carboxylic acids; Salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M133/00—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing nitrogen
    • C10M133/02—Lubricating compositions characterised by the additive being an organic non-macromolecular compound containing nitrogen having a carbon chain of less than 30 atoms
    • C10M133/04—Amines, e.g. polyalkylene polyamines; Quaternary 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
    • C10M141/00—Lubricating compositions characterised by the additive being a mixture of two or more compounds covered by more than one of the main groups C10M125/00 - C10M139/00, each of these compounds being essential
    • C10M141/08—Lubricating compositions characterised by the additive being a mixture of two or more compounds covered by more than one of the main groups C10M125/00 - C10M139/00, each of these compounds being essential at least one of them being an organic sulfur-, selenium- or tellurium-containing compound
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/66—Special parts or details in view of lubrication
    • F16C33/6603—Special parts or details in view of lubrication with grease as lubricant
    • F16C33/6633—Grease properties or compositions, e.g. rheological properties
    • 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
    • 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
    • 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
    • C10M2207/10—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
    • C10M2207/128—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 containing hydroxy groups; Ethers thereof
    • C10M2207/1285—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 containing hydroxy groups; Ethers thereof 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
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/28—Esters
    • C10M2207/283—Esters of polyhydroxy compounds
    • C10M2207/2835—Esters of polyhydroxy compounds used as base material
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/28—Esters
    • C10M2207/287—Partial esters
    • C10M2207/289—Partial esters containing free hydroxy groups
    • C10M2207/2895—Partial esters containing free hydroxy groups 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
    • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/02—Amines, e.g. polyalkylene polyamines; Quaternary amines
    • C10M2215/04—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to acyclic or cycloaliphatic carbon atoms
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
    • C10M2215/10—Amides of carbonic or haloformic acids
    • C10M2215/102—Ureas; Semicarbazides; Allophanates
    • C10M2215/1026—Ureas; Semicarbazides; Allophanates used as thickening 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
    • C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
    • C10M2219/04—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions containing sulfur-to-oxygen bonds, i.e. sulfones, sulfoxides
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
    • C10M2219/04—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions containing sulfur-to-oxygen bonds, i.e. sulfones, sulfoxides
    • C10M2219/044—Sulfonic acids, Derivatives thereof, e.g. neutral salts
    • 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
    • C10N2030/12—Inhibition of corrosion, e.g. anti-rust agents or anti-corrosives
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/02—Bearings
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/04—Oil-bath; Gear-boxes; Automatic transmissions; Traction drives
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/14—Electric or magnetic purposes
    • 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
    • C10N2040/25—Internal-combustion engines
    • 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
    • C10N2040/30—Refrigerators lubricants or compressors lubricants
    • 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, and more particularly to a grease composition having excellent rust prevention properties and a machine part using the grease composition, and particularly a bearing.
  • rolling bearing parts Represented in rolling bearing parts, compressors, blowers, etc. where rust due to intrusion of water, salt water, sea water, etc. on the road during driving, such as automobile electrical parts, engine auxiliary equipment, etc. represented by alternators and electromagnetic clutches, etc.
  • Typical examples include rolling bearing parts, washing machine and refrigerator, bathroom ventilators and bathroom dryers seen in recent years.
  • mechanical parts where rust is a problem, such as rolling bearing parts where rust due to a high humidity environment is a problem, such as motors for home appliances.
  • Such rolling bearings in which the occurrence of rust is a problem is prevented from being mixed with substances that cause rust by appropriate sealing and mechanical measures.
  • Patent Document 1 discloses a grease composition containing an oil-soluble organic inhibitor, a water-soluble inorganic passivating agent, and a nonionic surfactant as a rust inhibitor.
  • Patent Document 2 discloses a grease composition for encapsulating a bearing in which barium sulfonate is blended as a rust inhibitor.
  • it is known as a water-soluble inorganic passivating agent, and sodium nitrite, which has been widely used, is known to react with secondary amines to produce carcinogen N-nitrosamines, There are concerns about adverse effects on the human body.
  • barium sulfonate has a voluntary regulation in the industry as an environmental load substance.
  • Patent 2883134 Japanese Patent Laid-Open No. 5-140576
  • An object of the present invention is to provide a grease composition that is excellent in rust prevention properties and has a low environmental load. Another object of the present invention is to provide a machine part, particularly a bearing, using the above grease composition.
  • the present invention provides the following grease composition and machine parts using the same. 1.
  • a grease composition comprising a base oil, a thickener, and a rust inhibitor, wherein the rust inhibitor comprises an organic sulfonate and a fatty acid amine salt. 2.
  • the grease composition according to 1 above, wherein the organic sulfonate is at least one selected from the group consisting of calcium sulfonate and zinc sulfonate. 3. 3.
  • the grease composition of the present invention has excellent rust prevention properties even under severe rust generation conditions.
  • the thickener used in the grease composition of the present invention is not particularly limited.
  • metal soaps containing lithium, sodium, and the like, benton, silica gel, urea compounds, non-soaps such as fluorine-based thickeners typified by polytetrafluoroethylene, and the like can be given.
  • Particularly preferred are urea compounds and lithium soaps.
  • One type of thickener may be used alone, or two or more types may be used in combination.
  • the consistency of the grease composition of the present invention is preferably 200 to 400, and the content of the thickener is an amount necessary to obtain this consistency. Usually, it is preferably 3 to 30% by mass, more preferably 5 to 30% by mass, and most preferably 8 to 25% by mass with respect to the entire grease composition.
  • the base oil used in the grease composition of the present invention is not particularly limited.
  • mineral oils such as mineral oils; ester synthetic oils represented by diesters and polyol esters; synthetic hydrocarbon oils represented by polyalphaolefins and polybutenes; ether synthetic oils represented by alkyl diphenyl ethers and polypropylene glycols; silicone oils; fluorine All base oils, such as various synthetic oils, such as chemical oil, are mentioned.
  • Particularly preferred base oils include ester-based synthetic oils, synthetic hydrocarbon oils, ether-based synthetic oils that are excellent in low temperature and heat resistance.
  • One type of base oil may be used alone, or two or more types may be used in combination.
  • the rust inhibitor used in the present invention contains an organic sulfonate and a fatty acid amine salt as essential components.
  • the sulfonic acid component of the sulfonate include petroleum sulfonic acid, dinonylnaphthalene sulfonic acid and the like, and the salt is preferably a metal salt, and in particular, calcium salt, magnesium salt, sodium salt, potassium salt, lithium Examples include salts and zinc salts. Particularly preferred salts are calcium salts or zinc salts.
  • the organic sulfonate may be used alone or in combination of two or more.
  • the content of the organic sulfonate is preferably 0.1 to 10% by mass, more preferably 0.1 to 8% by mass, and still more preferably 0.2% as an active ingredient. ⁇ 5% by mass.
  • the fatty acid constituting the fatty acid amine salt is preferably a fatty acid having 4 to 22 carbon atoms, more preferably a fatty acid having 8 to 18 carbon atoms.
  • the fatty acid may be a saturated fatty acid or an unsaturated fatty acid, and may be a linear fatty acid, a branched fatty acid, a cyclic fatty acid, or a hydroxy fatty acid. Specific examples include stearic acid, palmitic acid, myristic acid, lauric acid, isostearic acid, octylic acid, undecylenic acid, oleic acid, and hydroxystearic acid.
  • the amine constituting the fatty acid amine salt is not particularly limited, but is preferably a saturated or unsaturated amine having 1 to 42 carbon atoms, and more preferably a saturated or unsaturated amine having 4 to 22 carbon atoms. .
  • the fatty acid amine salt may be used alone or in combination of two or more.
  • the content of the fatty acid amine salt is preferably 0.05 to 5% by mass, more preferably 0.05 to 3% by mass, and further preferably 0.1 to 3% by mass as an active ingredient. 2% by mass.
  • all additives usually used in the grease composition may be used alone or in combination of two or more as required. I can do it.
  • these additives include antioxidants, metal deactivators, detergent dispersants, extreme pressure additives, defoamers, demulsifiers, oiliness improvers, antiwear agents, solid lubricants, and the like.
  • Rust inhibitor C. Calcium sulfonate (calcium dinonylnaphthalene sulfonate) D. Zinc sulfonate (zinc dinonylnaphthalene sulfonate) E. Fatty acid amine salt (salt of a fatty acid having 8 carbon atoms and an amine having 12 carbon atoms, and a mixture of two salts of a fatty acid having 18 carbon atoms and a 12 to 20 carbon (mixed) amine (mass ratio 2: 1) )

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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)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lubricants (AREA)

Abstract

　本発明により、基油、増ちょう剤、及び錆止め剤を含むグリース組成物であって、錆止め剤が、有機スルホン酸塩、及び脂肪酸アミン塩を含有することを特徴とするグリース組成物を提供する。本発明のグリース組成物は、錆止め性に優れ、且つ環境に与える負荷が少ない。

Description

グリース組成物及び機械部品
　本発明は、グリース組成物に関し、特に錆止め性に優れたグリース組成物及びこれを使用した機械部品、特に軸受に関する。
　オルタネータや電磁クラッチなどに代表される自動車電装部品、エンジン補機等、走行中における、路上の水、塩水或いは海水などの浸入による錆が問題となる転がり軸受部品、圧縮機や送風機などに代表される産業機械モータのように冷却水使用による浸入や、屋外設置環境による雨水、海水の浸入による錆が問題となる転がり軸受部品、洗濯機や冷蔵庫、近年見られる浴室換気扇や浴室乾燥機などに代表される家電用モータのように高湿度環境などによる錆が問題となる転がり軸受部品など、錆の発生が問題となる多様な機械部品がある。
　このような錆の発生が問題となる転がり軸受などは、適当なシールや機構上の対策によって、錆の起因となる物質の混入を防いでいる。
　例えば、自動車においては、直接泥水等がかからない位置に配置したり、泥よけ等を取り付けたりの対策が行われている。
　しかし、転がり軸受は機構上、完全な密封は不可能であるため、使用する潤滑グリースも、錆止め性能を有することが必要である。
　例えば、特許文献１には、錆止め剤として、油溶性有機インヒビター、水溶性無機不働態化剤、非イオン界面活性剤を配合したグリース組成物が開示されている。
　特許文献２には、錆止め剤としてバリウムスルホネートを配合した軸受封入用グリース組成物が開示されている。
　しかし、水溶性無機不働態化剤として優れており、広く使用されていた亜硝酸ナトリウムは、第二級アミンと反応して、発がん物質であるＮ－ニトロソアミンを生成することが知られており、人体への悪影響が懸念されている。
　また、油溶性有機インヒビターとして広く使用されていたバリウムスルホネートをはじめとする有機スルホン酸塩のみの錆止め性では、特に塩水条件や海水条件のような厳しい条件下では、不満足なものである。
　また、バリウムスルホネートは非特許文献１に記載されているとおり、環境負荷物質として業界で自主規制の動きがある。
特許2883134号 特開平5-140576号
NTN TECHNICAL REVIEW No.73(2005) P10～13
　本発明の目的は、錆止め性に優れ、且つ環境負荷の少ないグリース組成物を提供することである。
　本発明の他の目的は、上記グリース組成物を使用した機械部品、特に軸受を提供することである。
　本発明は以下に示すグリース組成物及びこれを使用した機械部品を提供する。
１．基油、増ちょう剤、及び錆止め剤を含むグリース組成物であって、錆止め剤が、有機スルホン酸塩、及び脂肪酸アミン塩を含有することを特徴とするグリース組成物。
２．上記有機スルホン酸塩がスルホン酸カルシウム及びスルホン酸亜鉛からなる群から選ばれる少なくとも１種である上記１記載のグリース組成物。
３．脂肪酸アミン塩が、アミンと炭素数４～２２の脂肪酸の塩である上記１又は２記載のグリース組成物。
４．転がり軸受用である上記１～３のいずれか１項記載のグリース組成物。
５．上記１～４のいずれか１項記載のグリース組成物を使用した機械部品。
　本発明のグリース組成物は、厳しい錆発生条件下においても優れた錆止め性を有している。
　本発明のグリース組成物に使用される増ちょう剤は、特に限定されない。例えば、リチウムやナトリウム等を含む金属石けん類、ベントン、シリカゲル、ウレア化合物、ポリテトラフルオロエチレンに代表されるフッ素系増ちょう剤等の非石けん類などが挙げられる。特に好ましくは、ウレア化合物やリチウム石けん類である。これらは欠点が少なく、かつ高価でないため、実用性のある増ちょう剤である。
　増ちょう剤は一種類を単独で使用しても、二種類以上を組み合わせて使用しても良い。
　本発明のグリース組成物のちょう度は、２００～４００が好適であり、増ちょう剤の含有量はこのちょう度を得るのに必要な量となる。通常はグリース組成物全体に対して好ましくは３～３０質量％、さらに好ましくは５～３０質量％、最も好ましくは８～２５質量％である。
　本発明のグリース組成物に使用される基油は特に限定されない。例えば、鉱物油；ジエステル、ポリオールエステルに代表されるエステル系合成油；ポリαオレフィン、ポリブテンに代表される合成炭化水素油；アルキルジフェニルエーテル、ポリプロピレングリコールに代表されるエーテル系合成油；シリコーン油；フッ素化油など各種合成油など全ての基油が挙げられる。特に好ましい基油としては、低温性と耐熱性に優れる、エステル系合成油、合成炭化水素油、エーテル系合成油などが挙げられる。
　基油は一種類を単独で使用しても、二種類以上を組み合わせて使用しても良い。
　本発明に使用される錆止め剤は、有機スルホン酸塩と脂肪酸アミン塩を必須成分として含有する。
　上記スルホン酸塩のスルホン酸成分としては、例えば、石油スルホン酸、ジノニルナフタレンスルホン酸等が挙げられ、塩としては金属塩が好ましく、特に、カルシウム塩、マグネシウム塩、ナトリウム塩、カリウム塩、リチウム塩、亜鉛塩などが挙げられる。特に好ましい塩は、カルシウム塩、もしくは亜鉛塩である。
　本発明のグリース組成物において、有機スルホン酸塩は単独で使用しても良いし、２種以上を適宜組み合わせて使用しても良い。
　本発明のグリース組成物中、有機スルホン酸塩の含有量は、有効成分として、好ましくは、０．１～１０質量％、より好ましくは、０．１～８質量％、さらに好ましくは０．２～５質量％である。
　上記脂肪酸アミン塩を構成する脂肪酸としては、好ましくは炭素数４～２２の脂肪酸、さらに好ましくは炭素数８～１８の脂肪酸が挙げられる。脂肪酸は、飽和脂肪酸でも不飽和脂肪酸でも良く、更に直鎖脂肪酸、分岐脂肪酸、環状脂肪酸、ヒドロキシ脂肪酸でも良い。具体的には、ステアリン酸、パルミチン酸、ミリスチン酸、ラウリン酸、イソステアリン酸、オクチル酸、ウンデシレン酸、オレイン酸、ヒドロキシステアリン酸等が挙げられる。
　上記脂肪酸アミン塩を構成するアミンとしては、特に限定されないが、好ましくは飽和又は不飽和の炭素数１～４２のアミン、さらに好ましくは、飽和または不飽和の炭素数４～２２のアミンが挙げられる。
　具体的には、オクチルアミン、ラウリルアミン、ミリスチルアミン、ステアリルアミン、ベヘニルアミン、オレイルアミン、牛脂アルキルアミン、硬化牛脂アルキルアミン、アニリン、ベンジルアミン、シクロヘキシルアミン、ジエチルアミン、ジプロピルアミン、ジブチルアミン、ジフェニルアミン、ジベンジルアミン、ジシクロヘキシルアミン、トリエチルアミン、トリブチルアミン、ジメチルオクチルアミン、ジメチルデシルアミン、ジメチルステアリルアミン、ジメチル牛脂アルキルアミン、ジメチル硬化牛脂アルキルアミン、ジメチルオレイルアミン等が挙げられる。
　本発明のグリース組成物において、脂肪酸アミン塩は単独で使用しても良いし、２種以上を適宜組み合わせて使用しても良い。
　本発明のグリース組成物中、脂肪酸アミン塩の含有量は、有効成分として、好ましくは、０．０５～５質量％、より好ましくは、０．０５～３質量％、さらに好ましくは０．１～２質量％である。
　本発明のグリース組成物には、上記の有機スルホン酸塩、脂肪酸アミン塩以外に、必要に応じてグリース組成物に通常使用される全ての添加剤を単独又は２種以上混合して用いることが出来る。これらの添加剤の例としては、酸化防止剤、金属不活性化剤、清浄分散剤、極圧添加剤、泡消剤、抗乳化剤、油性向上剤、耐摩耗剤、固体潤滑剤などが挙げられる。
実施例
　下記の成分を使用し、ベースグリースに所定量の添加剤を加えてよく混ぜ、３本ロールミルで混練し、表１及び表２に示されるグリース組成物を製造した。
ベースグリース：
Ａ．増ちょう剤：１２-ヒドロキシステアリン酸リチウム
　　　　　　基油：ポリオールエステル　４０℃動粘度　３４．０ｍｍ2／ｓ
　　　　　　ちょう度：２５０
Ｂ．増ちょう剤：ジウレア化合物（パラトルイジン（２モル）とジフェニルメタンジイソシアネート（１モル）との反応物）
　　　　　　基油：ポリα-オレフィン　４０℃動粘度　４８．０ｍｍ2／ｓ
　　　　　　ちょう度：２８０
錆止め剤：
Ｃ．スルホン酸カルシウム（ジノニルナフタレンスルホン酸カルシウム塩）
Ｄ．スルホン酸亜鉛（ジノニルナフタレンスルホン酸亜鉛塩）
Ｅ．脂肪酸アミン塩（炭素数８の脂肪酸と炭素数１２のアミンとの塩、及び、炭素数１８の脂肪酸と炭素数１２～２０（混合）アミンとの塩の２種混合物（質量比２：１））
＜試験方法＞
・錆止め性 ： Ｅｍｃｏｒ防錆試験（ＩＰ２２０）　人工海水使用（ＩＳＯ７１２０）
　　・判定方法：外輪転送面の発錆状態観察（ｎ＝２）
　　　　合格　　０：発錆なし
　　　　不合格　１：小さな点錆３個以内
　　　　　　　　２：錆エリア１％以内
　　　　　　　　３：錆エリア１％超～５％以内
　　　　　　　　４：錆エリア５％超～１０％以内
　　　　　　　　５：１０％超
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000002
　有機スルホン酸塩（錆止め剤Ｃ，Ｄ）と脂肪酸アミン塩（錆止め剤Ｅ）を組み合わせて配合した実施例１～６は、いずれも発錆せず、錆止め性が良好であった。
　実施例１～３と錆止め剤として同量配合した比較例１（錆止め剤Ｃ配合）、比較例２（錆止め剤Ｄ配合）、比較例３（錆止め剤Ｃ，Ｄ配合）、比較例４（錆止め剤Ｅ配合）はいずれも発錆が認められ、錆止め性は劣る結果であった。
　実施例６と錆止め剤として同量配合した比較例５（錆止め剤Ｃ，Ｄ配合）は発錆が認められ、錆止め性は劣る結果であった。
　以上の例から明らかなように、本発明のグリース組成物は、有機スルホン酸塩、及び脂肪酸アミン塩を併用しているため、厳しい発錆条件下においても優れた錆止め性を有していることが示された。

Claims (5)

  1. 　基油、増ちょう剤、及び錆止め剤を含むグリース組成物であって、錆止め剤が、有機スルホン酸塩、及び脂肪酸アミン塩を含有することを特徴とするグリース組成物。
  2. 　上記有機スルホン酸塩がスルホン酸カルシウム及びスルホン酸亜鉛からなる群から選ばれる少なくとも１種である請求項１記載のグリース組成物。
  3. 　脂肪酸アミン塩が、アミンと炭素数４～２２の脂肪酸の塩である請求項１又は２記載のグリース組成物。
  4. 　転がり軸受用である請求項１～３のいずれか１項記載のグリース組成物。
  5. 　請求項１～４のいずれか１項記載のグリース組成物を使用した機械部品。
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JPH05140576A (ja) 1991-09-25 1993-06-08 Ntn Corp 軸受封入用グリース組成物
JP2002323053A (ja) 2001-04-26 2002-11-08 Nsk Ltd 転がり軸受
JP5224571B2 (ja) 2006-10-26 2013-07-03 協同油脂株式会社 グリース組成物及び軸受
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JP2002053884A (ja) * 2000-08-10 2002-02-19 Kyodo Yushi Co Ltd グリース組成物
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