JP6646379B2 - グリース組成物およびグリース封入転がり軸受 - Google Patents
グリース組成物およびグリース封入転がり軸受 Download PDFInfo
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- JP6646379B2 JP6646379B2 JP2015157988A JP2015157988A JP6646379B2 JP 6646379 B2 JP6646379 B2 JP 6646379B2 JP 2015157988 A JP2015157988 A JP 2015157988A JP 2015157988 A JP2015157988 A JP 2015157988A JP 6646379 B2 JP6646379 B2 JP 6646379B2
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- grease composition
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- 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
- C10M141/06—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 nitrogen-containing compound
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- 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
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- C10M111/04—Lubrication compositions characterised by the base-material being a mixture of two or more compounds covered by more than one of the main groups C10M101/00 - C10M109/00, each of these compounds being essential at least one of them being a macromolecular organic compound
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- 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
- C10M129/38—Carboxylic acids; Salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having 8 or more carbon atoms
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- C10M169/04—Mixtures of base-materials and additives
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- 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
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- F16C33/66—Special parts or details in view of lubrication
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- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
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- F16C33/66—Special parts or details in view of lubrication
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Description
本発明に用いるアルカノールアミンとしては、モノイソプロパノールアミン、モノエタノールアミン、およびモノ−n−プロパノールアミンなどの一級アルカノールアミン、N−アルキルモノエタノールアミン、およびN−アルキルモノプロパノールアミンなどの二級アルカノールアミン、トリエタノールアミン、シクロヘキシルジエタノールアミン、トリ(n−プロパノール)アミン、トリイソプロパノールアミン、N,N−ジアルキルエタノールアミン、およびN−アルキル(又はアルケニル)ジエタノールアミンなどの三級アルカノールアミンが挙げられる。また、アルカノール基の数により、モノアルカノールアミン、ジアルカノールアミン、トリアルカノールアミンに分類されるが、本発明では複数のヒドロキシル基(アルカノール基)とアミノ基のキレート作用により、鉄イオンを挟み込み、鉄系金属新生面の露出を防止しやすいことから、ジアルカノールアミンまたはトリアルカノールアミンを用いることが好ましい。
本発明に用いるキノリン系酸化防止剤は、下記式(1)で表される化合物である2,2,4−トリメチル−1,2−ジヒドロキノリン、および、この2量体以上の縮合物(重合物)である。また、該化合物と重合物との混合物を用いてもよい。
本発明に用いるジチオリン酸亜鉛(ジンクジチオフォスフェート;以下、「ZnDTP」という)としては、下記式(3)で示されるジアルキルジチオジチオリン酸亜鉛、ジアリールジチオリン酸亜鉛などが挙げられる。
本発明に用いる有機酸の金属塩は、芳香族系有機酸、脂肪族系有機酸、または脂環族系有機酸の金属塩(アルカリ金属塩やアルカリ土類金属塩)であればいずれも使用できる。また、有機酸としては一塩基性、多塩基性有機酸を使用できる。
本発明に用いるアミン系酸化防止剤としは、オクチル化ジフェニルアミンなどのアルキルジフェニルアミンやN-フェニル-1-ナフチルアミンなど、公知のアミン系酸化防止剤を使用できる。
本発明のグリース組成物の基油は、エステル系合成油を除く以外は特に限定されず、通常グリースの分野で使用される一般的なものを使用できる。エステル系合成油を除く理由は、基油にエステル系合成油を用いると、所望の効果が得られないためである(後述表1の比較例6)。基油としては、例えば、高度精製油、鉱油、エーテル系合成油、合成炭化水素油(PAO油)、シリコーン油、フッ素油およびこれらの混合油などを使用できる。これらの中でも合成油が好ましく、特に、アルキルジフェニルエーテル油およびPAO油から選ばれる少なくとも1つの油であることが好ましい。
表1に示した基油の半量に、4,4'−ジフェニルメタンジイソシアネート(以下「MDI」と記す)を該表に示す割合で溶解し、残りの半量の基油にMDIの2倍当量となるモノアミンを溶解した。それぞれの配合割合および種類は該表のとおりである。MDIを溶解した溶液を撹拌しながらモノアミンを溶解した溶液を加えた後、100〜120℃で30分間撹拌を続けて反応させて、ジウレア化合物を基油中に生成させベースグリースを得た。これに各添加剤を表1に示す配合割合で加えてさらに十分撹拌した。その後、三本ロールで均質化し、試験用のグリース組成物を得た。
回転軸を支持する内輪回転の転がり軸受(内輪・外輪・鋼球は軸受鋼SUJ2、型番:6203LLU(シール付き))にグリース組成物を封入し、急加減速試験を行なった。急加減速試験条件は、室温(25℃)雰囲気下、回転軸先端に取り付けたプーリに対する負荷荷重を1960N、回転速度は0rpm〜20000rpmで運転条件を設定し、さらに、試験軸受内に0.7Aの電流が流れる状態で試験を実施した。そして、軸受内に異常剥離が発生し、振動検出器の振動が設定値以上になって停止する時間(剥離発生寿命時間、h)を計測した。結果を表1に示す。
グリース組成物を転がり軸受(内径20mm×外径47mm×厚さ14mm、型番:6204ZZ(シール付き))に封入し、アキシャル荷重67Nとラジアル荷重67Nの下で、軸受温度180℃、10000rpmの回転速度で回転させ、焼き付きに至るまでの時間(高温耐久寿命時間、h)を測定した。結果を表1に示す。
ASTM D 1743に規定される錆試験法に準じて、試験条件を錆発生に対してより過酷な条件で行なった。あらかじめ有機溶剤により脱脂し、乾燥させた円錐ころ軸受30204に得られたグリース組成物を2.0g封入した後、アキシャル荷重を98N加えて毎分1800回転で1分間慣らし運転した。次に、1重量%食塩水に浸漬した後、この軸受を40℃で飽和水蒸気圧に達した密封高湿容器に入れ、40℃で48時間放置した後、発錆状況を調べた。発錆状況は外輪レースを周方向に32等分して錆のあった区間を数え、錆発生確率(百分率%)を算出した。結果を表1に示す。
2 内輪
3 外輪
4 転動体
5 保持器
6 シール部材
7 グリース組成物
8a、8b 開口部
Claims (7)
- 前記アルカノールアミンが、ジエタノールアミンであることを特徴とする請求項1記載のグリース組成物。
- 前記添加剤は、(c)ジチオリン酸亜鉛と、(d)有機酸の金属塩と、(e)アミン系酸化防止剤とを含み、
前記(c)〜(e)は、前記基油と前記増ちょう剤との合計量100重量部に対して、それぞれ0.1〜10重量部含まれることを特徴とする請求項1または請求項2記載のグリース組成物。 - 前記有機酸の金属塩がセバシン酸二ナトリウムであり、前記アミン系酸化防止剤がオクチル化ジフェニルアミンであることを特徴とする請求項3記載のグリース組成物。
- 前記基油が、アルキルジフェニルエーテル油およびポリ−α−オレフィン油から選ばれる少なくとも1つの油であることを特徴とする請求項1から請求項4までのいずれか1項記載のグリース組成物。
- 前記増ちょう剤が、脂環族ジウレア化合物であることを特徴とする請求項1から請求項5までのいずれか1項記載のグリース組成物。
- グリース組成物を封入してなるグリース封入転がり軸受であって、前記グリース組成物が請求項1から請求項6までのいずれか1項記載のグリース組成物であることを特徴とするグリース封入転がり軸受。
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US15/751,860 US10597598B2 (en) | 2015-08-10 | 2016-07-29 | Grease composition and grease-sealed roller bearing |
PCT/JP2016/072304 WO2017026299A1 (ja) | 2015-08-10 | 2016-07-29 | グリース組成物およびグリース封入転がり軸受 |
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CN110699156A (zh) * | 2019-09-19 | 2020-01-17 | 清研高装科技(天津)有限公司 | 一种润滑脂及其在轨道交通自动门滑道中的应用 |
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JP7593586B2 (ja) * | 2020-08-28 | 2024-12-03 | Ntn株式会社 | グリース組成物 |
CN113088365A (zh) * | 2021-03-31 | 2021-07-09 | 中昊(大连)化工研究设计院有限公司 | 一种耐高温型盾尾密封油脂及其制备方法 |
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