JP2006045272A - Low noise type lithium grease composition for sealing small-sized motor bearing - Google Patents

Low noise type lithium grease composition for sealing small-sized motor bearing Download PDF

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JP2006045272A
JP2006045272A JP2004224885A JP2004224885A JP2006045272A JP 2006045272 A JP2006045272 A JP 2006045272A JP 2004224885 A JP2004224885 A JP 2004224885A JP 2004224885 A JP2004224885 A JP 2004224885A JP 2006045272 A JP2006045272 A JP 2006045272A
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grease composition
oil
mass
lithium
motor bearing
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JP2006045272A5 (en
JP4688446B2 (en
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Hiroki Iwamatsu
宏樹 岩松
Motoharu Akiyama
元治 秋山
Yasuhiro Miyamoto
康弘 宮本
Seiji Okamura
征二 岡村
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Minebea Co Ltd
Nippon Grease Co Ltd
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Minebea Co Ltd
Nippon Grease Co Ltd
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Priority to JP2004224885A priority Critical patent/JP4688446B2/en
Priority to PCT/US2005/027331 priority patent/WO2006015341A1/en
Priority to CN2005800251121A priority patent/CN101087868B/en
Priority to US11/658,444 priority patent/US20080305973A1/en
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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
    • C10M169/02—Mixtures of base-materials and thickeners
    • 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
    • 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
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    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
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    • C10M2207/0406—Ethers; Acetals; Ortho-esters; Ortho-carbonates used as base material
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    • 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
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    • 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
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    • C10M2207/28—Esters
    • C10M2207/282—Esters of (cyclo)aliphatic oolycarboxylic acids
    • C10M2207/2825—Esters of (cyclo)aliphatic oolycarboxylic acids used as base material
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    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/28—Esters
    • C10M2207/283—Esters of polyhydroxy compounds
    • C10M2207/2835—Esters of polyhydroxy compounds used as base material
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    • C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
    • C10M2209/02—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
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    • C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
    • C10M2209/02—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C10M2209/06—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing monomers having an unsaturated radical bound to an acyloxy radical of saturated carboxylic or carbonic acid
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    • 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
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    • 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
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    • C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
    • C10N2030/76—Reduction of noise, shudder, or vibrations
    • C—CHEMISTRY; METALLURGY
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    • C10N2040/00—Specified use or application for which the lubricating composition is intended
    • C10N2040/02—Bearings
    • 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
    • F16C2380/00—Electrical apparatus
    • F16C2380/26—Dynamo-electric machines or combinations therewith, e.g. electro-motors and generators

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Abstract

<P>PROBLEM TO BE SOLVED: To provide an environment-friendly low noise type grease in which rotation sound of a motor is reduced by sealing it into a small-sized motor bearing used for motor bearing for household electric appliances such as air-conditioner, motor bearing, etc., for information machines and equipment such as hard disk driving. <P>SOLUTION: The grease composition comprises 5-20 mass% thickener and 95-80 mass% base oil. The grease composition uses lithium soap synthesized from lithium hydroxide and a 10-20C higher fatty acid and/or a ≥10C higher hydroxy fatty having one or more hydroxy groups as the thickener and contains, as a main component, a polymer ester oil (a) arranging ≥8 ester groups in comb-like shape on one side of a chain molecule of oil composed of ≥8 carbon atoms represented by general formula 1 (wherein R<SB>1</SB>, R<SB>2</SB>, R<SB>3</SB>and R<SB>4</SB>are each an alkyl group and x is an integer of 2 or more; y is an integer of 2 or more) as a base oil and has 25-80 mm<SP>2</SP>/s base oil viscosity (at 40°C). <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明のグリース組成物は、エアコン等の家電機器用モータ軸受、ハードディスク駆動等の情報機器用モータ軸受等に用いるグリースに関し、より詳しくは小型モーターの軸受に封入し、モータの回転音を低減する低騒音グリースに関する。   The grease composition of the present invention relates to grease used for motor bearings for home appliances such as air conditioners and motor bearings for information devices such as hard disk drives. It relates to low noise grease.

従来、８個以上の炭素原子で構成される油の鎖状分子の一側にエステル基を８個以上櫛歯状に配置したエステル系合成油（以下、ポリマーエステル油と云う。）を用いたグリース組成物としては、合成炭化水素油とエステル系合成油とを０．６５〜０．７５：０．３５〜０．２５の重量比で配合した基油に、ウレア系増稠剤を添加してなる軸受封入用グリースが知られている。（特許文献１）
しかし、このグリースは、急激に回転速度が変化する自動車のエンジン近傍に取付けられるベルト駆動プーリを支持する玉軸受に封入され、寒冷地で使用すると、笛吹き音に似た特異な音が発生する問題点を解決するために用いられている。
また、同様の軸受に封入するグリースとして、合成炭化水素油とエステル系合成油とを０．６５〜０．７５：０．３５〜０．２５の重量比で配合した基油に、ウレア系増稠剤を添加してなる軸受封入用グリース組成物も知られている（特許文献２）。 Conventionally, an ester-based synthetic oil (hereinafter referred to as a polymer ester oil) in which eight or more ester groups are arranged in a comb-like shape on one side of a chain molecule of an oil composed of eight or more carbon atoms has been used. As a grease composition, a urea-based thickener is added to a base oil in which a synthetic hydrocarbon oil and an ester-based synthetic oil are blended at a weight ratio of 0.65 to 0.75: 0.35 to 0.25. There is known a grease for enclosing a bearing. (Patent Document 1)
However, this grease is enclosed in a ball bearing that supports a belt-driven pulley that is mounted in the vicinity of an automobile engine whose rotational speed changes rapidly, and when used in a cold region, a unique sound similar to a whistling sound is generated. Used to solve problems.
In addition, as a grease to be sealed in the same bearing, a urea oil is added to a base oil in which a synthetic hydrocarbon oil and an ester synthetic oil are blended at a weight ratio of 0.65 to 0.75: 0.35 to 0.25. There is also known a grease composition for enclosing a bearing to which a thickener is added (Patent Document 2).

さらにまた、電子計算機半導体製造装置などに用いる軸受に封入されるグリース組成物において、低騒音、低振動が重視される場合は、リチウム石けんを増ちょう剤とし、エステル油を基油とするグリースに代表される低騒音、低トルクグリースが使用されている。しかし、このリチウム石けん−エステル系グリースは、飛散し易く、そのまま使用した場合は記録媒体を汚損するおそれが大きいという問題点があった（特許文献３）。
しかし、いずれの文献にも、ポリマーエステル油を基油の主成分とする低騒音の小型モータ軸受封入用グリース組成物に関する開示はなされていない。
特許第３５１４５７４号 特開平６−３０６３８３号 特許第３３２４６２８号 Furthermore, in a grease composition enclosed in a bearing used in an electronic computer semiconductor manufacturing apparatus or the like, when low noise and low vibration are important, a grease containing lithium soap as a thickener and ester oil as a base oil is used. Typical low noise and low torque grease is used. However, this lithium soap-ester grease easily scatters, and when used as it is, there is a problem that the recording medium is likely to be soiled (Patent Document 3).
However, none of the documents discloses a grease composition for encapsulating a low-noise small motor bearing having a polymer ester oil as a main component of a base oil.
Japanese Patent No. 3514574 JP-A-6-306383 Japanese Patent No. 3324628

本発明は、エアコン等の家電機器用モータ軸受、ハードディスク駆動等の情報機器用モータ軸受等に用いる小型モーターの軸受に封入し、モータの回転音を低減する低騒音グリースを開発すべく鋭意研究した結果、ポリマーエステル油を基油の主成分とし、軸受基材との親和性を高めるとともに、リチウム石けんを増ちょう剤とし、低騒音性の優れた小型モータ軸受封入用リチウムグリース組成物を見出すに至った。   The present invention has been intensively studied to develop a low-noise grease that reduces the rotational noise of a motor by enclosing it in a small motor bearing used in motor bearings for home appliances such as air conditioners and motor bearings for information devices such as hard disk drives. As a result, to find a lithium grease composition for encapsulating small motor bearings that has polymer ester oil as the main component of the base oil, increases affinity with the bearing base material, and uses lithium soap as a thickener, and is excellent in low noise. It came.

本発明は、増ちょう剤５〜２０質量％と基油９５〜８０質量％からなるグリース組成物であり、増ちょう剤としてリチウム石けんを用い、基油として下記一般式で示される鎖状分子の一側にエステル基を８個以上櫛歯状に配置したポリマーエステル油（イ）
（式中、Ｒ１、Ｒ２、Ｒ３、Ｒ４はいずれもアルキル基であり、ｘ≧２の整数、ｙ≧２の整数である。）
を主成分として含み、かつ、基油粘度（４０℃）が２５〜８０mm2/ｓであることを特徴とする小型モータ軸受封入用低騒音型リチウムグリース組成物である。
また、本発明においては、ポリマーエステル油（イ）を基油の主要成分として含んでいれば良いが、とくにポリマーエステル油（イ）以外にエステル系合成油（ロ）、合成炭化水素油（ハ）およびエーテル系合成油（二）の1種以上を含んでいても良い。
さらに、本発明において、ポリマーエステル油（イ）がグリース組成物全体の２０〜５０質量％、エステル系合成油（ロ）がグリース組成物全体の１０〜４５質量％、および合成炭化水素油（ハ）がグリース組成物全体の５〜４５質量％であるであることが望ましい。
さらにまた、本発明において、ポリマーエステル油（イ）がグリース組成物全体の２０〜５０質量％、エステル系合成油（ロ）がグリース組成物全体の１０〜４５質量％、合成炭化水素油（ハ）がグリース組成物全体の５〜１５質量％、およびエーテル系合成油（二）がグリース組成物全体の１０〜４５質量％であることが望ましい。
また、本発明において、リチウム石けんが、１２−ヒドロキシステアリン酸リチウム石けんと、直鎖脂肪酸リチウム石けんの混合物であり、１２−ヒドロキシステアリン酸リチウム石けんがグリース組成物全体の２．５〜１０質量％、直鎖脂肪酸リチウム石けんがグリース組成物全体の２．５〜１０質量％とすることができる。
さらに、本発明において、グリース組成物に添加剤として酸化防止剤、防錆剤等を添加することができる。 The present invention is a grease composition comprising 5 to 20% by mass of a thickener and 95 to 80% by mass of a base oil, using lithium soap as a thickener and a chain molecule represented by the following general formula as a base oil. Polymer ester oil with 8 or more ester groups arranged on one side in a comb shape (I)
(In the formula, R 1 , R 2 , R 3 and R 4 are all alkyl groups, and are integers of x ≧ 2 and y ≧ 2.)
And a base oil viscosity (40 ° C.) of 25 to 80 mm 2 / s, a low noise type lithium grease composition for enclosing a small motor bearing.
In the present invention, it is sufficient that the polymer ester oil (I) is contained as a main component of the base oil. In particular, in addition to the polymer ester oil (I), an ester synthetic oil (B), a synthetic hydrocarbon oil (HA) ) And ether type synthetic oil (2).
Furthermore, in the present invention, the polymer ester oil (a) is 20 to 50% by mass of the entire grease composition, the ester synthetic oil (b) is 10 to 45% by mass of the entire grease composition, and the synthetic hydrocarbon oil (c) ) Is preferably 5 to 45 mass% of the entire grease composition.
Furthermore, in the present invention, the polymer ester oil (a) is 20 to 50% by mass of the entire grease composition, the ester synthetic oil (b) is 10 to 45% by mass of the entire grease composition, and the synthetic hydrocarbon oil (c) ) Is preferably 5 to 15% by mass of the entire grease composition, and ether synthetic oil (2) is preferably 10 to 45% by mass of the entire grease composition.
In the present invention, the lithium soap is a mixture of 12-hydroxylithium lithium stearate soap and linear fatty acid lithium soap, and the 12-hydroxylithium lithium stearate soap is 2.5 to 10% by mass of the total grease composition, The linear fatty acid lithium soap can be 2.5 to 10% by mass of the entire grease composition.
Furthermore, in this invention, antioxidant, a rust preventive agent, etc. can be added to a grease composition as an additive.

本発明の小型モータ軸受封入用リチウムグリース組成物は、ポリマーエステル油を基油にしているため、エステル基が櫛歯状に配置され、全てのエステル基が金属表面への吸着に関与していると見られ、他のエステル系合成油に比べて金属表面へ均一な油膜を速やかに形成し、軸受の長寿命化に寄与し、さらにまた、増ちょう剤としてリチウム石鹸を使用しているため、添加剤の基油に対する溶解性を向上させることができて低騒音性も維持できる。
Since the lithium grease composition for encapsulating a small motor bearing of the present invention is based on a polymer ester oil, the ester groups are arranged in a comb shape, and all the ester groups are involved in the adsorption to the metal surface. Compared to other ester-based synthetic oils, a uniform oil film is quickly formed on the metal surface, contributing to a longer bearing life, and lithium soap is used as a thickener. The solubility of the additive in the base oil can be improved, and low noise can be maintained.

本発明で用いるリチウム石けんは、水酸化リチウムと、炭素数１０〜２０の高級脂肪酸および／または一個以上の水酸基を有する炭素数１０以上の高級ヒドロキシ脂肪酸とから合成されたリチウム石けんが用いられる。
本発明においては、リチウム石けんが、グリース組成物全体の５質量％以下であると、グリースが柔らかすぎ、リチウム石けんが、グリース組成物全体の２０質量％以上になると、グリースが硬くなりすぎる。 The lithium soap used in the present invention is a lithium soap synthesized from lithium hydroxide and a higher fatty acid having 10 to 20 carbon atoms and / or a higher hydroxy fatty acid having 10 or more carbon atoms and having one or more hydroxyl groups.
In the present invention, when the lithium soap is 5% by mass or less of the entire grease composition, the grease is too soft, and when the lithium soap is 20% by mass or more of the entire grease composition, the grease becomes too hard.

本発明で用いるポリマーエステル油（イ）は、一般式
（式中、Ｒ１、Ｒ２、Ｒ３、Ｒ４はいずれもアルキル基であり、ｘ≧２の整数、ｙ≧２の整数である。）で表されるポリマーエステルであれば、何でも良いが、分子量１０００〜３０００であり、粘度（４０℃）が１００〜２４５mm2/ｓであるものが好ましい。 The polymer ester oil (I) used in the present invention has a general formula
(In the formula, R 1 , R 2 , R 3 , and R 4 are all alkyl groups, and are integers of x ≧ 2 and y ≧ 2, respectively). However, those having a molecular weight of 1000 to 3000 and a viscosity (40 ° C.) of 100 to 245 mm 2 / s are preferable.

本発明で用いるエステル系合成油（ロ）は、次の一般式（ａ）、（ｂ）、（ｃ）で示される。
すなわち、一般式（ａ）、
RCOOH(CH2)n COOR’
-----（ａ）
(R、R’は炭素数３〜１８のアルキル基であり、同一であっても異なっていても良い。nは3〜12を示す)で表わされるジエステル系合成油、一般式（ｂ）
R(CH2COO R’)3 -----（ｂ）
(R、R’は炭素数３〜１０のアルキル基を示す)で表わされるトリエステル系合成油、一般式（ｃ）
Ｒ(CH2COO R’)4-----（ｃ）
(R、R’は炭素数３〜１０のアルキル基を示す)で表わされるテトラエステル系合成油および他のネオペンチルポリオールエステル系合成油が用いられる。
The ester-based synthetic oil (b) used in the present invention is represented by the following general formulas (a), (b), and (c).
That is, the general formula (a),
RCOOH (CH 2 ) n COOR '
----- (a)
(R and R ′ are alkyl groups having 3 to 18 carbon atoms, which may be the same or different. N represents 3 to 12), a diester synthetic oil represented by the general formula (b)
R (CH 2 COO R ') 3 ----- (b)
(R, R ′ represents an alkyl group having 3 to 10 carbon atoms) represented by a triester synthetic oil represented by the general formula (c)
R (CH 2 COO R ') 4 ----- (c)
Tetraester synthetic oils represented by (R and R ′ each represent an alkyl group having 3 to 10 carbon atoms) and other neopentyl polyol ester synthetic oils are used.

本発明で用いる合成炭化水素油（ハ）としては、合成炭化水素油としては、ポリα−オレフィン油、ポリブテン、オレフィンコポリマーであって、粘度（４０℃）が２０〜１００ｍｍ2 ／ｓであり、かつ安全に使用するためには、引火点２２０℃以上のものを採用することが好ましい。
これらは、α−オレフィンを低重合してオリゴマーとし、その末端二重結合に水素を添加した構造であり、代表的には下記の式

（式中、Ｒはアルキル基、ｎ＝１〜６の整数を表わす。）
で示すことができる。
ポリブテンもポリα−オレフィンの一種であり、このものはイソブチレンを主体とする出発原料から塩化アルミニウムを触媒として重合して製造できる。ポリブテンは、そのまま用いても水素添加して用いてもよい。
本発明で用いる合成炭化水素油（ハ）は、グリース組成物全体の５〜４５質量％であることが望ましい。 As the synthetic hydrocarbon oil (c) used in the present invention, the synthetic hydrocarbon oil is a poly α-olefin oil, a polybutene, an olefin copolymer, and has a viscosity (40 ° C.) of 20 to 100 mm 2 / s, And in order to use safely, it is preferable to employ | adopt a flash point 220 degreeC or more.
These are low-polymerized α-olefins to form oligomers, and hydrogen is added to the terminal double bonds.

(In the formula, R represents an alkyl group, and n represents an integer of 1 to 6.)
Can be shown.
Polybutene is also a kind of poly α-olefin, which can be produced by polymerizing a starting material mainly composed of isobutylene using aluminum chloride as a catalyst. Polybutene may be used as it is or after hydrogenation.
The synthetic hydrocarbon oil (c) used in the present invention is preferably 5 to 45 mass% of the entire grease composition.

本発明で用いるエーテル系合成油（二）は、アルキルジフェニールエーテルを用いることができ、ジアルキルジフェニールエーテル、モノアルキルジフェニールエーテル及びこれらの混合物等を挙げることができる。
本発明で用いるエーテル系合成油（二）は、グリース組成物全体の１０〜４５質量％であることが望ましい。
本発明のグリース組成物は、通常グリースに用いられる各種の添加剤を含有することも可能である。添加剤としては通常グリース組成物に用いられている添加剤、すなわちフェニルα（β）ナフチルアミン、アルキルジフェニルアミン、フェノチアジン、ｔ−ブチルフェノール等の酸化防止剤、金属スルホネート、非イオン系、アミン系等の防錆剤等が挙げられる。

次に、実施例を示すが、本発明はこれに限定されるものではない。 As the ether-based synthetic oil (2) used in the present invention, alkyl diphenyl ether can be used, and examples thereof include dialkyl diphenyl ether, monoalkyl diphenyl ether, and mixtures thereof.
The ether-based synthetic oil (2) used in the present invention is desirably 10 to 45% by mass of the entire grease composition.
The grease composition of the present invention can also contain various additives usually used in grease. As additives, additives usually used in grease compositions, that is, antioxidants such as phenyl α (β) naphthylamine, alkyldiphenylamine, phenothiazine, t-butylphenol, metal sulfonate, nonionic, amine-based, etc. Examples include rusting agents.

Next, although an Example is shown, this invention is not limited to this.

（実施例１〜１３）
増ちょう剤として、水酸化リチウムと、ステアリン酸および１２ヒドロキシステアリン酸とから合成されたリチウム石けんを用いた。
基油として、粘度（４０℃）が約１４０mm2/ｓであるポリマーエステル油、エステル系合成油としては、テトラエステル油及び又はジエステル油を用いた。ジエステル油としてＤＯＳ（ジ−２−エチルヘキシルセバケート）テトラエステル油としてＰＥ（ペンタエリスリトールエステル）を用いた。
合成炭化水素油として、ポリα−オレフィン油を用いた。
エーテル系合成油として、アルキルジフェニールエーテル油を用いた。
また、酸化防止剤としてアルキルジフェニルアミン、防錆剤としてカルシウムスルホネートを用いた。
表１に示す割合で混合し、全体が液体になるまで撹拌しながら２２０℃〜２３０℃に加熱した。これをステンレス容器に厚さ３〜５ｍｍになるように流し込み、５０℃以下に冷却後、三本ロールで均質化することによりグリース組成物を得た。表１にグリース組成物の成分割合と試験結果を示す。
(Examples 1 to 13)
As a thickener, lithium soap synthesized from lithium hydroxide, stearic acid and 12 hydroxystearic acid was used.
As the base oil, a polymer ester oil having a viscosity (40 ° C.) of about 140 mm 2 / s and a tetraester oil and / or a diester oil were used as the ester-based synthetic oil. PE (pentaerythritol ester) was used as DOS (di-2-ethylhexyl sebacate) tetraester oil as the diester oil.
A poly α-olefin oil was used as the synthetic hydrocarbon oil.
Alkyl diphenyl ether oil was used as the ether synthetic oil.
Further, alkyldiphenylamine was used as an antioxidant, and calcium sulfonate was used as a rust inhibitor.
The mixture was mixed at the ratio shown in Table 1, and heated to 220 ° C. to 230 ° C. with stirring until the whole became a liquid. This was poured into a stainless steel container so as to have a thickness of 3 to 5 mm, cooled to 50 ° C. or lower, and then homogenized with three rolls to obtain a grease composition. Table 1 shows the component ratio of the grease composition and the test results.

（比較例１〜６）
実施例と同様にして、各成分を配合し比較グリース組成物１〜４を作成した。
また、基油と増ちょう剤が知られている二種の市販グリースについて、比較例５、６として表２に示した。表２において、＋＋の記号は配合されている成分を示す。
表２に配合例と試験結果を示す。 (Comparative Examples 1-6)
Comparative grease compositions 1 to 4 were prepared by blending each component in the same manner as in the examples.
Further, two types of commercially available greases whose base oil and thickener are known are shown in Table 2 as Comparative Examples 5 and 6. In Table 2, the symbol ++ indicates a compounded component.
Table 2 shows formulation examples and test results.

混和ちょう度は、ＪＩＳ Ｋ２２２０ ７を、滴点は、ＪＩＳ Ｋ２２２０ ８をそれぞれ用いて求めたものである。軸受特性試験は、小型軸受に被検体であるグリース組成物を封入し、回転トルク、常温での音響特性、雰囲気温度１００℃、回転数３，０００ｒｐｍでの軸受回転試験で１０００時間後の揮発量、軸受の音響特性（音響寿命）について測定した。音響特性は、軸受回転試験の前後ともアンデロンメーターによるアンデロン値を測定した。回転トルクは、トルクテスターにより、３０００ｒｐｍ、荷重２ｋｇ、室温で測定した。揮発量は、軸受回転試験前後の軸受の重量を測定し、その差により求めた。各々の評価結果につき，モータ用軸受グリース組成物に要求される性能に従った判定結果を、表１（実施例）及び表２（比較例）に示した。音響特性はアンデロン値の小さいものほど、トルクは低いものほど、揮発量は少ないものほど優れている。評価は次の四段階で評価した。Ａは、とくに優れている。Ｂは、優れている。Ｃは、普通。Ｄは、劣っている。基油粘度の単位は、ｍｍ２／ｓである。
 The penetration is determined using JIS K22207, and the dropping point is determined using JIS K22208. In the bearing characteristic test, a grease composition as an object is sealed in a small bearing, and the volatilization amount after 1000 hours is measured in a bearing rotation test at a rotational torque, an acoustic characteristic at normal temperature, an ambient temperature of 100 ° C., and a rotational speed of 3,000 rpm. The acoustic characteristics (acoustic life) of the bearing were measured. For the acoustic characteristics, the Anderon value was measured with an Anderon meter before and after the bearing rotation test. The rotational torque was measured with a torque tester at 3000 rpm, a load of 2 kg, and room temperature. The amount of volatilization was determined by measuring the weight of the bearing before and after the bearing rotation test and calculating the difference. Table 1 (Example) and Table 2 (Comparative Example) show the determination results according to the performance required for the motor bearing grease composition for each evaluation result. The smaller the Anderon value, the lower the torque, and the lower the amount of volatilization, the better the acoustic characteristics. Evaluation was performed in the following four stages. A is particularly excellent. B is excellent. C is normal. D is inferior. The unit of base oil viscosity is mm 2 / s.

本発明の小型モータ軸受封入用リチウムグリース組成物は、軸受の長寿命化に寄与し、低騒音性も維持できるため、環境に優しいグリースであり、多くの需要が見込まれ、産業上の利用可能性が高いものである。
The lithium grease composition for encapsulating a small motor bearing of the present invention contributes to the long life of the bearing and can maintain low noise, so it is an environmentally friendly grease and is expected to be used in many industrial applications. It is highly probable.

Claims (7)

増ちょう剤５〜２０質量％と基油９５〜８０質量％からなるグリース組成物であり、増ちょう剤として水酸化リチウムと、炭素数１０〜２０の高級脂肪酸および／または一個以上の水酸基を有する炭素数１０以上の高級ヒドロキシ脂肪酸とから合成されたリチウム石けんを用い、基油として一般式
（式中、Ｒ１、Ｒ２、Ｒ３、Ｒ４はいずれもアルキル基であり、ｘ≧２の整数、ｙ≧２の整数である。）で表される鎖状分子の一側にエステル基を８個以上櫛歯状に配置したポリマーエステル油（イ）
を主成分として含み、かつ、基油粘度（４０℃）が２５〜８０mm2/ｓであることを特徴とする小型モータ軸受封入用低騒音型リチウムグリース組成物。 A grease composition comprising 5 to 20% by mass of a thickener and 95 to 80% by mass of a base oil, and has lithium hydroxide, a higher fatty acid having 10 to 20 carbon atoms and / or one or more hydroxyl groups as a thickener. Lithium soap synthesized from higher hydroxy fatty acids having 10 or more carbon atoms and a general formula as a base oil
(Wherein R 1 , R 2 , R 3 and R 4 are all alkyl groups, an integer of x ≧ 2 and an integer of y ≧ 2), an ester on one side of the chain molecule represented by Polymer ester oil (b) with 8 or more groups arranged in a comb-like shape
And a base oil viscosity (40 ° C.) of 25 to 80 mm 2 / s, a low noise type lithium grease composition for enclosing a small motor bearing. 基油として、ポリマーエステル油（イ）以外にエステル系合成油（ロ）、合成炭化水素油（ハ）およびエーテル系合成油（二）の1種以上を含む請求項１に記載した小型モータ軸受封入用低騒音型リチウムグリース組成物。 2. The small motor bearing according to claim 1, wherein the base oil includes at least one of an ester synthetic oil (b), a synthetic hydrocarbon oil (c) and an ether synthetic oil (2) in addition to the polymer ester oil (a). Low-noise lithium grease composition for encapsulation. ポリマーエステル油（イ）がグリース組成物全体の２０〜５０質量％、エステル系合成油（ロ）がグリース組成物全体の１０〜４５質量％、エーテル系合成油（二）がグリース組成物全体の１０〜４５質量％である請求項１に記載した小型モータ軸受封入用低騒音型リチウムグリース組成物。   Polymer ester oil (a) is 20 to 50% by mass of the entire grease composition, ester synthetic oil (b) is 10 to 45% by mass of the entire grease composition, and ether synthetic oil (2) is the total grease composition. The low-noise lithium grease composition for encapsulating a small motor bearing according to claim 1, wherein the composition is 10 to 45 mass%. ポリマーエステル油（イ）がグリース組成物全体の２０〜５０質量％、エステル系合成油（ロ）がグリース組成物全体の１０〜４５質量％、および合成炭化水素油（ハ）がグリース組成物全体の５〜４５質量％である請求項２に記載した小型モータ軸受封入用低騒音型リチウムグリース組成物。 Polymer ester oil (a) is 20 to 50% by mass of the entire grease composition, ester-based synthetic oil (b) is 10 to 45% by mass of the entire grease composition, and synthetic hydrocarbon oil (c) is the entire grease composition The low-noise type lithium grease composition for encapsulating a small motor bearing according to claim 2, wherein the composition is 5 to 45% by mass. ポリマーエステル油（イ）がグリース組成物全体の２０〜５０質量％、エステル系合成油（ロ）がグリース組成物全体の１０〜４５質量％、合成炭化水素油（ハ）がグリース組成物全体の５〜１５質量％、およびエーテル系合成油（二）がグリース組成物全体の１０〜３０質量％である請求項２に記載した小型モータ軸受封入用低騒音型リチウムグリース組成物。   Polymer ester oil (a) is 20 to 50% by mass of the entire grease composition, ester synthetic oil (b) is 10 to 45% by mass of the entire grease composition, and synthetic hydrocarbon oil (c) is the total grease composition. The low-noise type lithium grease composition for encapsulating a small motor bearing according to claim 2, wherein 5 to 15% by mass and ether type synthetic oil (2) is 10 to 30% by mass of the whole grease composition. リチウム石けんが、１２−ヒドロキシステアリン酸リチウム石けんと、直鎖脂肪酸リチウム石けん(炭素数１０〜２０)の混合物であり、１２−ヒドロキシステアリン酸リチウム石けんがグリース組成物全体の２．５〜１０質量％、直鎖脂肪酸リチウム石けん(炭素数１０〜２０)がグリース組成物全体の２．５〜１０質量％である請求項１〜５のいずれかひとつに記載した小型モータ軸受封入用低騒音型リチウムグリース組成物。 The lithium soap is a mixture of 12-hydroxylithium lithium stearate soap and linear fatty acid lithium soap (10 to 20 carbon atoms), and 12-hydroxylithium lithium stearate soap is 2.5 to 10% by mass of the total grease composition. The low-noise lithium grease for encapsulating a small motor bearing according to any one of claims 1 to 5, wherein the linear fatty acid lithium soap (10 to 20 carbon atoms) is 2.5 to 10% by mass of the entire grease composition. Composition. グリース組成物に添加剤として酸化防止剤、防錆剤等を添加した請求項１〜請求項６のいずれかひとつに記載した小型モータ軸受封入用低騒音型リチウムグリース組成物。
The low noise type lithium grease composition for encapsulating a small motor bearing according to any one of claims 1 to 6, wherein an antioxidant, a rust inhibitor, or the like is added as an additive to the grease composition.
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CN101087868B (en) 2012-02-29

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