JP3527100B2 - 潤滑グリース組成物 - Google Patents

潤滑グリース組成物

Info

Publication number
JP3527100B2
JP3527100B2 JP19114398A JP19114398A JP3527100B2 JP 3527100 B2 JP3527100 B2 JP 3527100B2 JP 19114398 A JP19114398 A JP 19114398A JP 19114398 A JP19114398 A JP 19114398A JP 3527100 B2 JP3527100 B2 JP 3527100B2
Authority
JP
Japan
Prior art keywords
grease composition
lubricating grease
weight
base oil
alkyl group
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP19114398A
Other languages
English (en)
Other versions
JP2000026875A (ja
Inventor
淳 柴山
浩 木村
庸一郎 杉森
雅雄 山本
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NSK Ltd
Kyodo Yushi Co Ltd
Original Assignee
NSK Ltd
Kyodo Yushi Co Ltd
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 NSK Ltd, Kyodo Yushi Co Ltd filed Critical NSK Ltd
Priority to JP19114398A priority Critical patent/JP3527100B2/ja
Priority to US09/348,292 priority patent/US6235690B1/en
Publication of JP2000026875A publication Critical patent/JP2000026875A/ja
Priority to US09/765,288 priority patent/US6500788B2/en
Application granted granted Critical
Publication of JP3527100B2 publication Critical patent/JP3527100B2/ja
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • 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
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    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M105/00—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound
    • C10M105/08—Lubricating compositions characterised by the base-material being a non-macromolecular organic compound containing oxygen
    • C10M105/32—Esters
    • C10M105/48—Esters of carbonic acid
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    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M115/00—Lubricating compositions characterised by the thickener being a non-macromolecular organic compound other than a carboxylic acid or salt thereof
    • C10M115/08—Lubricating compositions characterised by the thickener being a non-macromolecular organic compound other than a carboxylic acid or salt thereof containing nitrogen
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    • C10M117/00—Lubricating compositions characterised by the thickener being a non-macromolecular carboxylic acid or salt thereof
    • C10M117/02—Lubricating compositions characterised by the thickener being a non-macromolecular carboxylic acid or salt thereof having only one carboxyl group bound to an acyclic carbon atom, cycloaliphatic carbon atom or hydrogen
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    • C10M117/00—Lubricating compositions characterised by the thickener being a non-macromolecular carboxylic acid or salt thereof
    • C10M117/02—Lubricating compositions characterised by the thickener being a non-macromolecular carboxylic acid or salt thereof having only one carboxyl group bound to an acyclic carbon atom, cycloaliphatic carbon atom or hydrogen
    • C10M117/04—Lubricating compositions characterised by the thickener being a non-macromolecular carboxylic acid or salt thereof having only one carboxyl group bound to an acyclic carbon atom, cycloaliphatic carbon atom or hydrogen containing hydroxy groups
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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
    • C10M2207/121—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of seven or less carbon atoms
    • C10M2207/122—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of seven or less carbon atoms monocarboxylic
    • C10M2207/1225—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of seven or less carbon atoms monocarboxylic used as thickening agent
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    • C10M2207/10—Carboxylix acids; Neutral salts thereof
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    • C10M2207/124—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of seven or less carbon atoms containing hydroxy groups; Ethers thereof
    • C10M2207/1245—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of seven or less carbon atoms containing hydroxy groups; Ethers thereof used as thickening agent
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    • 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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    • C10M2207/128—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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    • C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
    • C10M2207/10—Carboxylix acids; Neutral salts thereof
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    • C10M2207/129—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of thirty or more carbon atoms
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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
    • C10M2207/16—Naphthenic acids
    • C10M2207/166—Naphthenic acids used as thickening agents
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    • C10M2207/18—Tall oil acids
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    • C10M2207/10—Carboxylix acids; Neutral salts thereof
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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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    • C10M2207/325—Esters of carbonic acid used as base material
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    • C10M2215/006—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions used as thickening agents
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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
    • C10M2215/026—Amines, e.g. polyalkylene polyamines; Quaternary amines used as thickening agents
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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Emergency Medicine (AREA)
  • Lubricants (AREA)

Description

【発明の詳細な説明】
【０００１】
【発明の属する技術分野】本発明は、潤滑グリース組成
物に関し、特に玉軸受用潤滑グリース組成物に関する。
【０００２】
【従来の技術】従来、軸受、特にコンピュータのハード
ディスク、ＣＤ−Ｒ等の記録装置のスピンドルモータの
玉軸受用のグリースとしては、ジオクチルセバケート、
ペンタエリスリトールエステル等のエステル油を基油と
し、リチウムステアレート、リチウムヒドロキシステア
レート等を増ちょう剤としたものが使用されている。し
かし、近年記録密度の増大による軸受精度の向上や回転
数の増加による使用温度の上昇等により、軸受の音響寿
命に不足が見られてきた。
【０００３】
【発明が解決しようとする課題】従って、本発明の目的
は、従来のグリースより摩擦係数が低く、軸受に使用し
た場合、音響寿命の長い潤滑グリース組成物、特に玉軸
受用の潤滑グリース組成物を提供することである。
【０００４】
【課題を解決するための手段】本発明は、基油と増ちょ
う剤を含有する潤滑グリース組成物において、基油の５
０〜１００重量％が下記式（１）で表される炭酸エステ
ル化合物であることを特徴とする潤滑グリース組成物を
提供するものである。 （１） Ｒ1 Ｏ−ＣＯ−ＯＲ2 式中、Ｒ1 及びＲ2 は独立して、炭素数６〜３０の飽和
又は不飽和の、直鎖又は分岐アルキル基を表す。本発明
において増ちょう剤としては、リチウム石けん、ナトリ
ウム石けん、カルシウム石けん、アルミニウム石けん、
これらのコンプレックス石けん、及びウレア化合物から
なる群から選ばれるものが好ましい。本発明の潤滑グリ
ース組成物は、特にスピンドルモータの玉軸受用潤滑グ
リース組成物として好ましい。
【０００５】
【発明の実施の形態】本発明の潤滑グリース組成物の基
油として使用される式（１）で表される炭酸エステル化
合物として好ましいものは、Ｒ1 及びＲ2 が独立して、
炭素数７〜２５の飽和又は不飽和の、分岐アルキル基を
表すものである。分岐アルキル基として好ましいもの
は、−ＣＨ2 ＣＨＲ3 Ｒ4 で表されるものである。この
式においてＲ3 は、炭素数１〜７の飽和直鎖アルキル
基、Ｒ4 は、炭素数４〜１２の飽和直鎖アルキル基を表
す。特に好ましいものは、Ｒ3 とＲ4 の炭素数の和が１
１〜１３であるものである。本発明の潤滑グリース組成
物において、式（１）で表される炭酸エステル化合物
は、基油の５０〜１００重量％、好ましくは６０〜１０
０重量％、更に好ましくは７０〜１００重量％の量で使
用される。
【０００６】また式（１）で表される炭酸エステル化合
物と併用してもよい基油としては、ポリオールエステル
油等のエステル系合成油、アルキルジフェニルエーテル
等のエーテル系合成油、ポリアルファ−オレフィン等の
合成炭化水素油、パラフィン系鉱油等の鉱物油が挙げら
れる。本発明に使用する増ちょう剤は、好ましくは、リ
チウム石けん、ナトリウム石けん、カルシウム石けん、
アルミニウム石けん、これらのコンプレックス石けん、
及びウレア化合物からなる群から選ばれる。リチウム石
けん、例えば、ステアリン酸リチウムや12−ヒドロキシ
ステアリン酸リチウム等が特に好ましい。ウレア系増ち
ょう剤としては、例えば、脂肪族又は脂環式ジウレア化
合物、ポリウレア化合物が挙げられる。増ちょう剤の使
用量は、グリース全体に対して３〜３０重量％が適当で
あり、５〜２５重量％がさらに好ましい。本発明のグリ
ースは、上記成分に加えて、酸化防止剤、錆止め剤、防
食剤等の汎用の添加剤を含有することができる。
【０００７】
【実施例】次に本発明を実施例及び比較例により説明す
る。 実施例１及び比較例１ 表１に示す基油に増ちょう剤を加えて攪拌し、グリース
を製造した。表中のグリース成分の数値は重量部であ
る。各グリースについて、混和ちょう度及び音響寿命を
測定した。結果を表１に示す。 音響寿命試験 軸受：内径５mm、外径９mm、幅４mmの玉軸受 グリース封入量：１０mg 外輪回転数：12,000rpm 雰囲気温度：７０℃ アキシャル荷重：２kgf 評価方法 試験前と連続回転試験2,000 時間後の、玉軸受の加速度
振動値（Ｇ値）を、以下の基準で評価した。 ◎：試験後のＧ値が、試験前のＧ値と殆ど同じ。 ○：試験後のＧ値が、試験前のＧ値の１．５倍以下。 △：試験後のＧ値が、試験前のＧ値の２．０倍以下。 ×：試験後のＧ値が、試験前のＧ値の２．０倍より大き
い。
【０００８】
【表１】 実施例 比較例 １ ２ ３ ４ ５ ６ ７ １ ２ ３ 基油 炭酸エステル(1) 90 66 88 85 85 53 60 60 20 − PET (2) − 22 − − − 22 23 8 70 90 増ちょう剤 Li(12OH)St(3) 10 − 6 15 − − − − 10 10 LiSt(4) − 12 6 − − − − 32 − − 脂肪族ジウレア − − − − 15 − − − − − 芳香族ジウレア − − − − − 25 − − − − 脂環式ジウレア − − − − − − 17 − − − 混和ちょう度 241 310 263 214 255 238 235 152 248 252 音響寿命 ◎ ○ ◎ ◎ ◎ ○ ○ × △ △
【０００９】(1) RO-CO-OR' (R及びR'は-CH2CHR3R4であ
り、R3は炭素数１〜７の飽和直鎖アルキル基、R4は炭素
数４〜１２の飽和直鎖アルキル基であり、R3とR4の炭素
数の和は１１〜１３である。）（40℃における動粘度：
18mm/s2) (2) PET:ペンタエリスリトールエステル（40℃における
動粘度：32mm/s2) (3) Li(12OH)St: 12-ヒドロキシステアリン酸リチウム (4) LiSt: ステアリン酸リチウム
【００１０】上記結果は、本発明のグリースが、従来の
ペンタエリスリトールエステル油を基油とするグリース
と比較して、音響寿命に優れていることを示している。
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ Ｃ１０Ｎ 40:02 Ｃ１０Ｎ 50:10 50:10 (72)発明者 杉森 庸一郎 神奈川県藤沢市鵠沼神明１丁目５番50号 日本精工株式会社内 (72)発明者 山本 雅雄 神奈川県藤沢市鵠沼神明１丁目５番50号 日本精工株式会社内 (56)参考文献 特開 平８−209176（ＪＰ，Ａ) 特開 平９−217077（ＪＰ，Ａ) 特開 平９−316480（ＪＰ，Ａ) 特開 平11−199883（ＪＰ，Ａ) 米国特許2758975（ＵＳ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) C10M 169/02 C10M 105/48 C10M 115/08 C10N 30:00 C10N 40:02 C10N 50:10

Claims (6)

    (57)【特許請求の範囲】
  1. 【請求項１】 基油と、増ちょう剤としてのウレア化合
    物とを含有する潤滑グリース組成物であって、前記基油
    が、該基油の全重量に基づいて、５０〜１００重量％の
    炭酸エステル化合物を含有し、前記炭酸エステル化合物
    が、式（１）、 Ｒ1 −Ｏ−ＣＯ−ＯＲ2 （１） （式中、Ｒ1 及びＲ2 は、独立して、炭素数６〜３０の
    飽和又は不飽和の、直鎖又は分岐アルキル基を表す。）
    で示され、かつ前記ウレア化合物の量が、前記グリース
    組成物の全重量に基づいて、３〜３０重量％であること
    を特徴とする潤滑グリース組成物。
  2. 【請求項２】 前記Ｒ1及びＲ2が、独立して、炭素数７
    〜２５の飽和又は不飽和の分岐アルキル基である請求項
    １記載の潤滑グリース組成物。
  3. 【請求項３】 前記分岐アルキル基が、ＣＨ2ＣＨＲ3Ｒ
    4で示され、前記Ｒ3が、炭素数１〜７の飽和直鎖アルキ
    ル基であり、前記Ｒ4が、炭素数４〜１２の飽和直鎖ア
    ルキル基であり、Ｒ3及びＲ4の全炭素数が１１〜１３で
    ある請求項２記載の潤滑グリース組成物。
  4. 【請求項４】 前記炭酸エステル化合物の量が、前記基
    油の全重量に基づいて、６０〜１００重量％である請求
    項１〜３のいずれか１項記載の潤滑グリース組成物。
  5. 【請求項５】 前記炭酸エステル化合物の量が、前記基
    油の全重量に基づいて、７０〜１００重量％である請求
    項１〜４のいずれか１項記載の潤滑グリース組成物。
  6. 【請求項６】 前記ウレア化合物の量が、グリース組成
    物の全重量に基づいて、５〜２５重量％である請求項１
    〜５のいずれか１項記載潤滑グリース組成物。
JP19114398A 1998-07-07 1998-07-07 潤滑グリース組成物 Expired - Fee Related JP3527100B2 (ja)

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US09/348,292 US6235690B1 (en) 1998-07-07 1999-07-07 Urea thickened carbonate ester grease composition
US09/765,288 US6500788B2 (en) 1998-07-07 2001-01-22 Lubricating grease composition

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JP2001072989A (ja) * 1999-09-08 2001-03-21 Minebea Co Ltd 高効率電動機用軸受
JP3794541B2 (ja) * 1999-11-13 2006-07-05 日本グリース株式会社 情報機器用軸受グリース組成物
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KR100733182B1 (ko) * 2000-07-26 2007-06-27 이데미쓰 고산 가부시키가이샤 냉동기용 윤활유 및 이를 포함하는 냉동기용 작동유체조성물
JP2002265970A (ja) 2001-03-14 2002-09-18 Koyo Seiko Co Ltd グリース組成物およびそのグリース組成物で潤滑した転がり軸受
JP4883741B2 (ja) * 2001-08-28 2012-02-22 協同油脂株式会社 有機液体のゲル化剤及びゲル化物の製造方法
JP4662118B2 (ja) * 2004-03-26 2011-03-30 協同油脂株式会社 低発塵グリース組成物
CN102796589A (zh) * 2012-07-24 2012-11-28 北京金骄生物质化工有限公司 一种环境友好合成润滑油及其制备方法
US20230002898A1 (en) * 2019-10-29 2023-01-05 Merck Patent Gmbh Process for the production of a molecular layer and electronic component comprising same

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