JPH059489A - Grease composition for bearing of electronic computor - Google Patents
Grease composition for bearing of electronic computorInfo
- Publication number
- JPH059489A JPH059489A JP16027091A JP16027091A JPH059489A JP H059489 A JPH059489 A JP H059489A JP 16027091 A JP16027091 A JP 16027091A JP 16027091 A JP16027091 A JP 16027091A JP H059489 A JPH059489 A JP H059489A
- Authority
- JP
- Japan
- Prior art keywords
- grease
- oil
- amount
- scattering
- bearing
- 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.)
- Pending
Links
Landscapes
- Lubricants (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、電子計算機軸受用グ
リース組成物に関し、特にグリースの飛散性，摩擦トル
ク性能，音響性能の改良に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grease composition for electronic computer bearings, and more particularly to improvement of grease scattering properties, friction torque performance and acoustic performance.
【０００２】[0002]
【従来の技術】電子計算機の記録媒体装置に組み込まれ
ている軸受または軸受ユニットに用いられるグリースに
対する最大の要求性能は、飛散量いわゆるアウトガスの
少ないこととされている。軸受から飛散するアウトガス
で記録媒体が汚損されるとエラーの原因となるためであ
る。また、ブックタイプ，ラップトップ等の小型コンピ
ュータの普及に伴い、それに使用される軸受は益々小さ
くなり、そのため軸受の摩擦トルク性能の向上（トルク
値やその変動値の抑制）と、音響性能の向上（低振動，
低騒音）が求められている。更に、軸受寿命を左右する
グリースの寿命に対する要求も益々長くなり、５〜１０
年が要求されるようになっている。2. Description of the Related Art The maximum required performance for grease used in a bearing or a bearing unit incorporated in a recording medium device of an electronic computer is that the amount of scattering, so-called outgas, is small. This is because if the recording medium is contaminated by the outgas scattered from the bearing, it may cause an error. Also, with the spread of small computers such as book type and laptop, the bearings used for them become smaller and smaller, so that the friction torque performance of the bearing is improved (the torque value and its fluctuation value are suppressed) and the acoustic performance is improved. (Low vibration,
Low noise) is required. Furthermore, the demand for the life of grease, which affects the life of the bearing, becomes longer and longer.
The year has come to be required.
【０００３】従来、電子計算機軸受用グリースとして
は、アンドックＣ（商品名）として良く知られたナトリ
ウム石けん系グリース（鉱油を基油とし、増ちょう剤に
ナトリウムコンプレックス石けんを用いたナトリウムコ
ンプレックス石けん−鉱油系グリース）が、その飛散性
を評価されて２０年以上にわたり殆ど独占的に使用され
てきた。Conventionally, as a grease for computer bearings, a sodium soap type grease well known as Undock C (trade name) (sodium complex soap-mineral oil using mineral oil as a base oil and sodium complex soap as a thickener) is used. Type greases have been used almost exclusively for 20 years or more after being evaluated for their scattering properties.
【０００４】しかし、ナトリウム石けん系グリースは音
響性能が良くないため、特に低騒音，低振動性が重視さ
れる場合には、リチウム石けん−エステル系グリースに
代表される低騒音，低トルクグリースが使用されてい
る。その場合、グリースの飛散は磁性流体シールを併用
して抑制している。However, since sodium soap type grease has poor acoustic performance, low noise and low torque grease represented by lithium soap-ester type grease is used especially when low noise and low vibration characteristics are important. Has been done. In that case, the scattering of grease is also suppressed by using a magnetic fluid seal together.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、ナトリ
ウムコンプレックス石けん−鉱油系グリースは、石けん
分のグリース中での分散性が悪いため、それが夾雑物に
なって騒音（いわゆるゴミ音と呼ばれる初期音）が発生
し、振動性能も悪い。さらに、ナトリウムコンプレック
ス石けんの潮解性のため水分を吸収し易く、時間の経過
とともに表面が硬化して軸受中での流動性が悪くなり、
潤滑不良を来して保持器音が発生し易くなる。そのた
め、従来の電子計算機軸受用グリースとしてのナトリウ
ムコンプレックス石けん−鉱油系グリースは、しばしば
音響，振動に起因するトラブルを引き起こすという問題
点があった。However, since the sodium complex soap-mineral oil grease has poor dispersibility in the grease of the soap component, it becomes a contaminant and generates noise (so-called initial noise). Occurs and the vibration performance is poor. Furthermore, due to the deliquescent property of sodium complex soap, it is easy to absorb water, the surface hardens over time, and the fluidity in the bearing deteriorates.
Lubrication becomes poor and the cage noise is likely to occur. Therefore, the sodium complex soap-mineral oil type grease as a conventional grease for computer bearings has a problem that it often causes troubles due to sound and vibration.
【０００６】一方、従来のリチウム石けん−エステル系
グリースにあっては、リチウム石けんの分散性が良好で
音響，振動に関しては問題ない。しかし反面で、グリー
スが飛散し易く、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。そこで飛散を防止するため高価
な磁性流体シールを併用しなければならず、製品のコス
トアップを招くとともに、磁性流体シールの取付スペー
スが必要で小型化の妨げになるという問題点があった。On the other hand, in the conventional lithium soap-ester type grease, the dispersibility of lithium soap is good and there is no problem in sound and vibration. On the other hand, however, the grease easily scatters, and if used as it is, the recording medium may be contaminated. Therefore, in order to prevent the scattering, an expensive magnetic fluid seal must be used together, which leads to an increase in the cost of the product, and there is a problem that a mounting space for the magnetic fluid seal is required, which hinders miniaturization.
【０００７】そこで本発明の課題は、上記従来の問題点
を解決することにあり、飛散性と音響性能とトルク性能
がともに優れた、長寿命の電子計算機軸受用グリース組
成物を提供することを目的としている。Therefore, an object of the present invention is to solve the above-mentioned conventional problems, and it is an object of the present invention to provide a grease composition for a computer bearing which has a long life and is excellent in scattering, acoustic performance and torque performance. Has an aim.
【０００８】[0008]
【課題を解決するための手段】本発明のグリース組成物
は、４０℃において８〜１８０ｃＳｔの動粘度を有する
鉱油，合成炭化水素油およびポリフェニルエーテル油の
群から選ばれた少なくとも１種の基油７０〜８０重量％
と、化学構造式中に水酸基を含まないＣ12〜Ｃ 24高級脂
肪酸のリチウム塩２０〜３０重量％とを含有する。Means for Solving the Problems The grease composition of the present invention
Has a kinematic viscosity of 8 to 180 cSt at 40 ° C.
Of mineral oils, synthetic hydrocarbon oils and polyphenyl ether oils
70-80% by weight of at least one base oil selected from the group
And C that does not contain a hydroxyl group in the chemical structural formula12~ C twenty fourHigh-grade fat
20 to 30% by weight of lithium salt of fatty acid.
【０００９】さらに、スルホン酸塩，ナフテン酸塩の群
から選ばれた少なくとも１種の防錆添加剤０．０１〜
１．０重量％を添加することができる。また、本発明の
グリース組成物のちょう度は２００〜２７０とすること
ができる。Furthermore, at least one rust preventive additive selected from the group consisting of sulfonates and naphthenates 0.01 to 0.01 is added.
1.0% by weight can be added. Further, the consistency of the grease composition of the present invention can be 200 to 270.
【００１０】[0010]
【作用】上記の組成は、増ちょう剤にリチウム石けんを
用いたため音響性能が良い。しかも同程度のちょう度の
通常のリチウム石けん系グリースと比べて、増ちょう剤
量が多く、かつ短繊維構造としたため、飛散しにくい。
また、基油としては高精製度鉱油や耐熱性に優れた合成
炭化水素油，ポリフェニルエーテル油を用いているため
耐久性も良い。The above composition has good acoustic performance because lithium soap is used as a thickener. Moreover, the amount of thickening agent is large and the short fiber structure makes it less likely to scatter, as compared with a normal lithium soap grease having a similar consistency.
Further, as the base oil, a highly refined mineral oil, a synthetic hydrocarbon oil having excellent heat resistance, or a polyphenyl ether oil is used, so that the durability is good.
【００１１】以下、さらに詳細に説明する。本願発明者
らは、従来の課題を解決して良好な飛散性と音響性能と
を兼ね備えた電子計算機軸受用グリース組成物を提供す
べく鋭意研究を重ねた結果、リチウム石けん系グリース
の増ちょう剤量を通常の量より多くするとともに、短繊
維構造とすることが有効であることを見出して本発明を
なすに至ったものである。The details will be described below. The inventors of the present application have earnestly studied to provide a grease composition for a computer bearing having both good scattering properties and good acoustic performance by solving conventional problems, and as a result, a thickener for lithium soap grease. The present invention has been completed by finding that it is effective to make the amount larger than a normal amount and to make a short fiber structure.
【００１２】本発明のグリース組成物に使用される基油
としては、鉱油系潤滑油，合成炭化水素油，ポリフェニ
ルエーテル油のいずれかを、単独にまたは混合して用い
ることができる。混合する場合の混合比率は任意でよ
い。鉱油は石油からの高度精製油が望ましいが、粘度指
数は問わない。合成炭化水素油としてはポリαオレフィ
ン、液状ポリブテンなどのオレフィン重合油およびアル
キル芳香族油のいずれも使用できる。その中では、ポリ
αオレフィン例えば１−Ｄｅｃｅｎｅ（CH3(CH2) 7CH=CH
2 ) のオリゴマーやエチレンとポリαオレフィンとの共
重合体などが好ましい。ポリフェニールエーテルとして
は、芳香環数が２〜５環のものが市販されており、いず
れも使用できるが、環数が増えるに従い低温性能が低下
し且つ価格も高価になる。したがって、２環でしかもア
ルキル置換基により低温性能を向上させたモノアルキル
ジフェニールエーテルやジアルキルジフェニールエーテ
ルが最も実用的である。ちなみに、エステル油やシリコ
ーン油等は不適当であり、特に一般にグリース基油とし
てよく使用されているエステル油は、微量混入してもグ
リース組成物の飛散性を大きく増加せしめることが本発
明者らの研究により確認されている。また、シリコーン
油はリチウム石けんとの相溶性が悪く、油分離しやす
く、飛散量も多い。また音響性能にも劣る。Base oil used in the grease composition of the present invention
As mineral oil-based lubricating oil, synthetic hydrocarbon oil, polyphenylene
Ruther oil, either alone or mixed
You can The mixing ratio when mixing is arbitrary.
Yes. Mineral oil is preferably highly refined oil from petroleum, but viscosity
The number does not matter. As a synthetic hydrocarbon oil, poly-α-olefin
Olefin polymerized oils such as
Any of the kill aromatic oils can be used. Among them, poly
α-olefins such as 1-Decene (CH3(CH2) 7CH = CH
2) Oligomers and copolymers of ethylene and poly α-olefins
Polymers and the like are preferable. As polyphenyl ether
Is commercially available with 2 to 5 aromatic rings.
All can be used, but low temperature performance decreases as the number of rings increases.
And the price becomes expensive. Therefore, two rings and
Monoalkyl with improved low temperature performance due to rukyi substituents
Diphenyl ether and dialkyl diphenyl ethere
Le is the most practical. By the way, ester oil and silico
It is not suitable to use grease oil, especially as a grease base oil.
Ester oil, which is often used in
The main aim is to greatly increase the scattering properties of lease compositions
It has been confirmed by the study of the authors. Also silicone
Oil has poor compatibility with lithium soap and is easy to separate
And the amount of scattering is large. It also has poor acoustic performance.
【００１３】本発明のグリース組成物に用いる基油の粘
度については、４０℃において８〜１８０ｃＳｔの動粘
度を有するものが使用可能である。８ｃＳｔ未満では低
すぎて蒸発しやすく、耐久性能に難点があり、一方、１
８０ｃＳｔを超えると摩擦トルクを増大させるだけでな
く飛散量も増加する。もっとも、本発明者らの研究によ
れば、どちらかといえば基油粘度は低い方が飛散性の点
でより一層効果があがることが確認されており、その点
を考慮すれば４０℃において１６〜１００ｃＳｔ程度が
好ましいといえる。Regarding the viscosity of the base oil used in the grease composition of the present invention, those having a kinematic viscosity of 8 to 180 cSt at 40 ° C. can be used. If it is less than 8 cSt, it is too low to easily evaporate and has a problem in durability performance.
When it exceeds 80 cSt, not only the friction torque is increased but also the amount of scattering is increased. However, according to the studies by the present inventors, it has been confirmed that the lower the viscosity of the base oil is, the more effective it is in terms of the splattering property. It can be said that about 100 cSt is preferable.
【００１４】本発明のグリース組成物に使用される増ち
ょう剤は、分散性が良く良好な音響性能が得やすい水酸
基を含まない高級脂肪酸のリチウム塩である。中でもス
テアリン酸リチウム、および牛脂脂肪酸のリチウム塩が
適している。両者は基油の種類は問わず、鉱油系潤滑
油，合成炭化水素油，ポリフェニルエーテル油のいずれ
にも使用できる。研究の結果、リチウム石けん系グリー
スの増ちょう剤として一般によく使われている１２−ヒ
ドロキシステアリン酸リチウムやヒマシ硬化脂肪酸のリ
チウム塩は、飛散量を増加させるので不適当であること
が判明した。The thickener used in the grease composition of the present invention is a lithium salt of a higher fatty acid containing no hydroxyl group, which has good dispersibility and is easy to obtain good acoustic performance. Among them, lithium stearate and lithium salt of tallow fatty acid are suitable. Both can be used for any of mineral oil type lubricating oils, synthetic hydrocarbon oils, and polyphenyl ether oils regardless of the type of base oil. As a result of research, it has been found that lithium 12-hydroxystearate and a lithium salt of castor-cured fatty acid, which are commonly used as thickeners for lithium soap grease, are not suitable because they increase the amount of scattering.
【００１５】一方、飛散性の点では問題ないとされ、ナ
トリウム石けん系グリースの増ちょう剤として用いられ
るナトリウムテレフタラメート，ナトリウムコンプレッ
クス石けんなどの増ちょう剤はいずれも音響性能が悪
く、本発明のグリース組成物には使用できないことが実
験の結果明白になった。本発明は、更に増ちょう剤の配
合量が、グリース組成物の飛散性に影響を及ぼすとい
う、発明者らの研究の結果あきらかにされた事実に基づ
いてなされている。すなわち、従来のリチウム石けん系
グリースの場合の増ちょう剤の配合量は、８〜２０重量
％が一般的である。これに対して本発明の場合は、上記
増ちょう剤の混合量を２０〜３０重量％の範囲に規定す
る。好ましくは、２３〜２７重量％である。リチウム石
けん系増ちょう剤の配合量をこのように制御することに
より、飛散性が少なく、しかも音響性能良好という従来
なかったグリース組成物が実現できる。２０重量％未満
であるとグリース組成物の飛散抑制効果が小さすぎて、
電子計算機の記録媒体汚染を阻止するという本発明の目
的が達成されない。一方、３０重量％を超えるとグリー
ス組成物が硬くなりすぎて、軸受の内部でのグリースの
流動性が悪くなり、その結果、保持器音が出易くなって
音響性能を悪化させる。On the other hand, thickeners such as sodium terephthalamate and sodium complex soap used as thickeners for sodium soap type grease are considered to have no problem in terms of splattering property, and have poor acoustic performance. It became clear as a result of the experiment that it cannot be used in a grease composition. The present invention is based on the fact clarified as a result of the study by the inventors that the compounding amount of the thickener affects the scattering property of the grease composition. That is, the compounding amount of the thickener in the conventional lithium soap grease is generally 8 to 20% by weight. On the other hand, in the case of the present invention, the amount of the thickener mixed is specified in the range of 20 to 30% by weight. It is preferably 23 to 27% by weight. By controlling the amount of the lithium soap-based thickening agent to be controlled in this way, it is possible to realize an unprecedented grease composition having less scattering and good acoustic performance. If it is less than 20% by weight, the effect of suppressing scattering of the grease composition is too small,
The object of the present invention to prevent recording medium contamination of electronic computers is not achieved. On the other hand, if it exceeds 30% by weight, the grease composition becomes too hard, and the fluidity of the grease inside the bearing deteriorates, and as a result, the cage noise easily occurs and the acoustic performance deteriorates.
【００１６】グリースの飛散は軸受の回転により発生し
たグリースの微粒子が飛び散るためである。グリースの
硬さが飛散性の一つの因子になると思われるが、反面、
硬いほど軸受内部での流動性が悪く保持器音が発生し易
いことから、硬さは音響性能の一因子でもある。かくし
て、本発明者らはグリース組成物のちょう度の臨界的意
義についても検討を重ねた結果、ちょう度の下限を２０
０、上限を２８０とすることが望ましいとの結論を得
た。ちょう度が２００未満であると硬すぎて音響性能が
顕著に悪化する。一方、ちょう度が２８０を超えると飛
散量が増加して、電子計算機の記録媒体が汚損される。The scattering of grease is because the grease particles generated by the rotation of the bearing scatter. It seems that the hardness of grease is one of the factors that cause the scattering, but on the other hand,
Hardness is also a factor in acoustic performance, because the harder the fluidity inside the bearing, the easier cage noise is generated. Thus, the present inventors have repeatedly studied the critical significance of the consistency of the grease composition, and as a result, the lower limit of the consistency is set to 20.
It was concluded that it is desirable to set 0 and the upper limit to 280. If the consistency is less than 200, the hardness is too high and the acoustic performance is significantly deteriorated. On the other hand, if the consistency exceeds 280, the amount of scattering increases, and the recording medium of the electronic computer is soiled.
【００１７】本発明のグリース組成物にあっては、更に
添加剤として酸化防止剤及び防錆剤を必要に応じて用い
ることができる。本発明者らは、公知のフェニルαナフ
チルアミン，ジフェニルアミン，フェノチアジン，ｐ，
ｐ´−ジオクチルジフェニルアミンなどのアミン系およ
び2,6-ジ-t- ブチル-ｐ- クレゾール，4,4 ´- メチレ
ンビス-2,6- ジ- t-ブチルフェノールなどのフェノール
系の酸化防止剤を添加した場合の飛散性に関して実験的
に検討したが、特に影響は認められなかった。これに対
し防錆剤については、石油スルホン酸やジノニルナフタ
レンスルホン酸のナトリウム，カルシウム，マグネシウ
ム，バリウム，亜鉛塩などのスルホン酸塩と亜鉛や鉛の
ナフテン酸塩を用いて検討した結果、添加量0.01〜1.0
重量％では問題ないが、一般的な防錆剤添加量の下限値
とされている1.0重量％を超えるとグリース組成物の飛
散が急激に多くなることが認められた。添加量0.01重量
％未満では、防錆効果がほとんど認められなかった。In the grease composition of the present invention, an antioxidant and a rust preventive can be further used as additives, if necessary. The present inventors have known phenyl α-naphthylamine, diphenylamine, phenothiazine, p,
Addition of amine antioxidants such as p'-dioctyldiphenylamine and phenolic antioxidants such as 2,6-di-t-butyl-p-cresol and 4,4'-methylenebis-2,6-di-t-butylphenol The effect of scattering was examined experimentally, but no particular effect was observed. On the other hand, as a rust preventive agent, as a result of studying using sulfonates such as sodium, calcium, magnesium, barium, and zinc salts of petroleum sulfonic acid and dinonylnaphthalene sulfonate and naphthenates of zinc and lead, addition Amount 0.01-1.0
Although there is no problem with the weight%, it was confirmed that the amount of the grease composition scattered abruptly increases when the amount exceeds 1.0%, which is the lower limit of the general amount of the added rust preventive agent. When the amount added was less than 0.01% by weight, almost no rust preventive effect was observed.
【００１８】[0018]
【実施例】次に、本発明の実施例と比較例について説明
する。表１に示す実施例１〜１８の添加剤を入れないグ
リースと、表２に示す実施例１９〜２５の添加剤を入れ
たグリース、及び表３に示す比較例１〜１８の組成を有
するグリースを用いて、ちょう度並びに、飛散量，軸受
音響，摩擦トルクを測定した。測定結果を各表下欄に併
記した。ちょう度は不混和ちょう度と混和ちょう度とを
ＪＩＳ Ｋ２２２０（５．３）により求めたものであ
る。また、飛散量，軸受音響，摩擦トルクの各物性値の
測定は、被検体のグリース組成物を有機溶媒により完全
に脱脂した内径５mm，外径１４mmの非接触ゴムシール付
単列深みぞ玉軸受に１９ｍｇ封入し、常温で予圧1.5 Kg
ｆの条件下で行った。EXAMPLES Next, examples of the present invention and comparative examples will be described. Greases containing no additives of Examples 1 to 18 shown in Table 1, greases containing additives of Examples 19 to 25 shown in Table 2, and greases having compositions of Comparative Examples 1 to 18 shown in Table 3 Was used to measure the consistency, scattering amount, bearing sound, and friction torque. The measurement results are also shown in the lower column of each table. The consistency is obtained by determining the immiscible consistency and the miscible consistency according to JIS K2220 (5.3). The physical properties such as the amount of scattering, bearing acoustics, and friction torque were measured with a single-row deep groove ball bearing with an inner diameter of 5 mm and an outer diameter of 14 mm in which the grease composition of the sample was completely degreased with an organic solvent. Encloses 19 mg and preloads 1.5 Kg at room temperature
It was carried out under the condition of f.
【００１９】[0019]
【表１】 [Table 1]
【００２０】[0020]
【表２】 [Table 2]
【００２１】[0021]
【表３】 [Table 3]
【００２２】飛散量測定装置の略図を図１に示す。グリ
ース組成物を封入した軸受Ａを３，６００ｒｐｍで２０
分間回転させながら、図１に示す容器Ｂ中に清浄空気を
流し、0.01 cubic feet (cF)の体積の空気量毎にその中
の0.3 μｍ以上のパーティクルカウント数を測定した。
表１，２，３には軸受回転１０分後の飛散量を示した。A schematic diagram of the scattering amount measuring device is shown in FIG. Bearing A containing the grease composition at 20 at 3,600 rpm
While rotating for a minute, clean air was caused to flow in the container B shown in FIG. 1 and the particle count number of 0.3 μm or more therein was measured for each air amount of 0.01 cubic feet (cF).
Tables 1, 2 and 3 show the amount of scattering after 10 minutes of bearing rotation.
【００２３】軸受の音響測定は、アンデロンメータを用
いて、１８００ｒｐｍで被検体軸受を回転させたときの
保持器音の有無を聴覚にて判定したものである。表１，
２，３には、保持器音が発生しないときに◎、ほとんど
発生しないときに○、ときどき発生するとき△、絶えず
発生するときあに×で表示した。摩擦トルク測定装置の
略図を図２に示す。被検体軸受Ａを３６００ｒｐｍで１
０分間回転させて、その間のトルク値の変動をストレイ
ンゲージＣを用いてレコーダに記録した。なお、図２に
おいて、Ｄはエアスピンドル、Ｅはアーバ、Ｆはアルミ
キャップ、Ｇはエアベアリングである。The acoustic measurement of the bearing is performed by using an Anderon meter to auditorily judge the presence or absence of a cage sound when the bearing is rotated at 1800 rpm. Table 1,
In Nos. 2 and 3, ⊚ indicates that the cage sound is not generated, ∘ indicates that the cage sound hardly occurs, Δ indicates that the cage sound occurs occasionally, and x indicates that it occurs constantly. A schematic diagram of the friction torque measuring device is shown in FIG. Specimen bearing A 1 at 3600 rpm
It was rotated for 0 minutes, and the fluctuation of the torque value during that time was recorded on the recorder using the strain gauge C. In FIG. 2, D is an air spindle, E is an arbor, F is an aluminum cap, and G is an air bearing.
【００２４】図３に実施例のグリースの摩擦トルク変動
の一例を、図４に比較例のグリースの摩擦トルク変動の
一例を示す。表１，２，３には、回転約１０分後でトル
クがほぼ安定したときの値を示した。実施例１〜２５の
グリースは、どのグリース組成物も全て飛散性，音響性
能ともに良好であったのに対して、比較例１〜１８のグ
リースは飛散性，音響性能の少なくともいずれかに問題
があった。FIG. 3 shows an example of the friction torque fluctuation of the grease of the example, and FIG. 4 shows an example of the friction torque fluctuation of the grease of the comparative example. Tables 1, 2 and 3 show the values when the torque was substantially stable after about 10 minutes of rotation. The greases of Examples 1 to 25 all had good splattering properties and acoustic performances, while the greases of Comparative Examples 1 to 18 had problems in at least one of splattering properties and acoustic performances. there were.
【００２５】図５に示すように、基油の粘度に関して
は、ステアリン酸リチウム２５重量％と、４０℃におけ
る動粘度が８〜１８０ｃＳｔの範囲内にある鉱油７５重
量％とからなる実施例１〜４に対して比較例２を対比す
ると、基油の動粘度が２００ｃＳｔまで高くなると飛散
量が飛躍的に増加し、かつ音響性能も良くないことが明
らかで、グリース性状に及ぼす基油粘度の影響が認めら
れ、更に、実施例４，実施例７の場合、４０℃における
基油動粘度が１８０ｃＳｔと他の実施例に比較して高い
が、これらは飛散量が他の実施例より比較的大きくなっ
ており、やはり飛散性に対する基油粘度の関与を示唆し
ている。しかし現在、電子計算機軸受に多く使用されて
いるアンドックＣグリース（商品名）の上記測定方法に
よる飛散量が、最大のもので３００程度であるので、こ
れを基準として判定すると、４０℃での動粘度が１８０
ｃＳｔまでの基油は良好なグリース組成物が得られると
考えられる。With respect to the viscosity of the base oil, as shown in FIG. 5, Examples 1 to 15 consisted of 25% by weight of lithium stearate and 75% by weight of mineral oil having a kinematic viscosity at 40 ° C. in the range of 8 to 180 cSt. When Comparative Example 2 is compared with No. 4, it is clear that when the kinematic viscosity of the base oil increases up to 200 cSt, the amount of splashing increases dramatically and the acoustic performance is not good, and the effect of the base oil viscosity on the grease properties. Furthermore, in the case of Examples 4 and 7, the kinematic viscosity of the base oil at 40 ° C. was 180 cSt, which was higher than those of the other Examples, but the amount of scattering was relatively larger than those of the other Examples. It also suggests that the viscosity of the base oil contributes to the splattering property. However, the maximum amount of scattering of Undock C Grease (trade name), which is currently used in computer bearings, is about 300. Therefore, if this value is used as a reference, it will be Viscosity is 180
It is believed that a base oil up to cSt will give a good grease composition.
【００２６】一方、基油の種別に関しては、増ちょう剤
がステアリン酸リチウムで基油にジエステルを用いた比
較例３、及びポリオールエステルを用いた比較例４，６
と、増ちょう剤の種類と量は同じで基油のみ異なる実施
例１〜１１とを対比すると、比較例のものはいずれも飛
散量が実施例のものに比して桁違いに多くなっている。
この結果から、エステル系油はは電子計算機軸受用グリ
ース組成物の基油としては用い得ないことが明白であ
る。また、比較例５は、リチウム石けんグリースの基油
としてシリコーン油を用いると油分離を生じやすく、ま
た音響性能の劣るグリース組成物しか得られないことを
示す。これに対して動粘度が上記の範囲内にある限り、
鉱油，ポリα−オレフィン油，ポリフェニルエーテル油
は本発明のリチウム石けんグリースの基油として好適な
ことが、各実施例の性状から明白である。On the other hand, regarding the type of the base oil, Comparative Example 3 in which the thickener was lithium stearate and the diester was used in the base oil, and Comparative Examples 4 and 6 in which the polyol ester was used were used.
And Examples 1 to 11 in which the type and amount of the thickener are the same but only the base oil is different, the scattering amount of each of the comparative examples is incomparably larger than that of the example. There is.
From this result, it is clear that the ester oil cannot be used as the base oil of the grease composition for computer bearings. Further, Comparative Example 5 shows that when silicone oil is used as the base oil of lithium soap grease, oil separation easily occurs and only a grease composition having poor acoustic performance can be obtained. On the other hand, as long as the kinematic viscosity is within the above range,
It is clear from the properties of each example that mineral oil, poly α-olefin oil, and polyphenyl ether oil are suitable as the base oil of the lithium soap grease of the present invention.
【００２７】増ちょう剤の種別に関しては、比較例１か
ら、ナトリウムコンプレックス石けんを用いると音響性
能が極端に悪化することがわかる。ナトリウムコンプレ
ックス石けんグリースは、その吸湿性によりグリースの
硬化を生じ保持器音を発生しやすくなる。また、比較例
１３のナトリウムテレフタラメートを用いたグリース
は、増ちょう剤量が２０重量％でもちょう度が小さく音
響性能が悪いことがわかる。また、比較例８には、１２
−ヒドロキシステアリン酸を主成分とするヒマシ硬化脂
肪酸をけん化したリチウム石けんグリースは音響性能は
悪くないが飛散量を増加させることが示されている。比
較例７，９，１２では、増ちょう剤に１２−ヒドロキシ
ステアリン酸リチウムを用いているが、これらのグリー
スの飛散量は極端に大きくなっている。しかもグリース
のちょう度もステアリン酸リチウムや牛脂脂肪酸のリチ
ウム塩を増ちょう剤としたものに比し小さく、したがっ
て音響性能も悪化している。すなわち、１２−ヒドロキ
システアリン酸リチウムはグリースの飛散性も音響性能
も共に悪化させることが明らかで、本発明のグリース組
成物には全く使用できない。Regarding the type of the thickener, it is understood from Comparative Example 1 that the acoustic performance is extremely deteriorated when sodium complex soap is used. Due to its hygroscopicity, sodium complex soap grease hardens the grease and tends to generate cage noise. Further, it can be seen that the grease using the sodium terephthalamate of Comparative Example 13 has a low consistency and a poor acoustic performance even when the amount of the thickener is 20% by weight. Further, in Comparative Example 8, 12
It has been shown that lithium soap grease obtained by saponifying castor-cured fatty acid containing hydroxystearic acid as a main component does not deteriorate acoustic performance but increases the amount of scattering. In Comparative Examples 7, 9, and 12, lithium 12-hydroxystearate is used as the thickener, but the amount of these greases scattered is extremely large. Moreover, the consistency of the grease is smaller than that of the one using lithium stearate or a lithium salt of beef tallow fatty acid as a thickener, and therefore the acoustic performance is deteriorated. That is, it is clear that lithium 12-hydroxystearate deteriorates both the scattering property of the grease and the acoustic performance, and cannot be used in the grease composition of the present invention at all.
【００２８】図６に示すように、増ちょう剤の量に関し
ては、ステアリン酸リチウムの場合も牛脂脂肪酸のリチ
ウム塩の場合も、その含有量が全組成物量に対し２０〜
３０重量％とされた実施例では、飛散性も音響性能も良
好である。これに対して、ステアリン酸リチウムの含有
量を１８重量％に減らした比較例１０では、音響性能は
良好であるが、飛散量が実施例に比し大幅に増加してい
る。反対にステアリン酸リチウムの含有量を３３重量％
に増加させた比較例１１では、飛散性は良好であるが、
音響性能は悪化している。すなわち、本発明の場合は、
増ちょう剤の配合量を２０〜３０重量％の範囲に規定す
ることが必要で、リチウム石けんの配合量をこのように
制御することにより、飛散性も音響性能も良好なグリー
ス組成物が実現できることが明らかである。増ちょう剤
量が２０重量％未満の比較例１０では、ちょう度が２８
０を超えて柔らかくなっており、飛散し易くなったこと
を示唆している。一方、増ちょう剤量が３０重量％を超
えている比較例１１では、ちょう度が２００未満に減少
しており、グリース組成物が硬くなりすぎて、音響性能
が悪化したことを示唆している。As shown in FIG. 6, with respect to the amount of the thickener, both in the case of lithium stearate and in the case of the lithium salt of tallow fatty acid, the content thereof is 20 to the total amount of the composition.
In the example of 30% by weight, the scattering property and the acoustic performance are good. On the other hand, in Comparative Example 10 in which the content of lithium stearate was reduced to 18% by weight, the acoustic performance was good, but the scattering amount was significantly increased as compared with the Examples. On the contrary, the content of lithium stearate is 33% by weight.
In Comparative Example 11 increased to 1, the scattering property is good,
The acoustic performance has deteriorated. That is, in the case of the present invention,
It is necessary to regulate the compounding amount of the thickener in the range of 20 to 30% by weight, and by controlling the compounding amount of the lithium soap in this way, it is possible to realize a grease composition having good scattering properties and acoustic performance. Is clear. In Comparative Example 10 in which the thickener amount was less than 20% by weight, the consistency was 28.
It became softer than 0, suggesting that it became easy to scatter. On the other hand, in Comparative Example 11 in which the amount of the thickener exceeds 30% by weight, the consistency is reduced to less than 200, suggesting that the grease composition becomes too hard and the acoustic performance is deteriorated. .
【００２９】添加剤の影響に関しては、実施例１８〜２
５および比較例１４〜１８に示される。アミン系および
フェノール系の酸化防止剤の添加の影響を、無添加の実
施例２と、添加の実施例１８，１９との対比でみると、
添加量の多少にかかわらず酸化防止剤はグリースの飛散
性にも音響性能にも全く関与しないことがわかる。これ
に対し防錆剤については、グリースの飛散性への影響が
認められた。もっともスルフォン酸塩とナフテン酸塩に
ついては、実施例２１〜２５の結果に示されるように、
添加量が1.0 重量％以内であれば飛散量は0.3μｍ以上
の粒子数が２００個／0.01cF以下となり、実用上問題と
される程ではない。しかし、1.0 重量％を超えるとグリ
ース組成物の飛散が急激に多くなることが比較例１４，
１５に示されている（図８）。また、防錆剤として硫化
物（比較例１８）やコハク酸アミド（比較例１６やアミ
ン塩（比較例１７）を用いた場合には、その添加量が0.
2 重量％と少量であっても飛散量は大幅に増加すること
が確認されている。Regarding the influence of the additives, Examples 18 to 2
5 and Comparative Examples 14-18. The effect of the addition of the amine-based and phenol-based antioxidants is compared with that of the non-added Example 2 and the added Examples 18 and 19,
It can be seen that the antioxidant does not contribute to the grease scattering property or the acoustic performance at all, regardless of the addition amount. On the other hand, the rust preventive agent was found to have an effect on the grease scattering property. However, regarding the sulfonate and naphthenate, as shown in the results of Examples 21 to 25,
If the addition amount is within 1.0% by weight, the amount of scattering is 200 particles / 0.01 cF or less with particles of 0.3 μm or more, which is not a practical problem. However, when it exceeds 1.0% by weight, the scattering of the grease composition is rapidly increased in Comparative Example 14,
15 (FIG. 8). Further, when a sulfide (Comparative Example 18) or succinic acid amide (Comparative Example 16 or amine salt (Comparative Example 17)) was used as a rust preventive agent, the addition amount was 0.
It has been confirmed that even with a small amount of 2% by weight, the amount of scattering greatly increases.
【００３０】[0030]
【発明の効果】以上説明したように本発明の電子計算機
軸受用グリース組成物は、基油として４０℃において８
〜１８０ｃＳｔの動粘度を有する鉱油，耐熱性に優れた
合成炭化水素油，ポリフェニルエーテル油のうちの少な
くとも１種を７０〜８０重量％用い、増ちょう剤として
音響性能が良いリチウム石けんを用い、その増ちょう剤
量を２０〜３０重量％と多くし、かつ飛散しにくい短繊
維構造とした。そのため、飛散性と音響性能とトルク性
能がともに優れた、長寿命の電子計算機軸受用グリース
組成物が得られる。As described above, the grease composition for a computer bearing according to the present invention is used as a base oil at 8 ° C at 8 ° C.
70% to 80% by weight of at least one of mineral oil having a kinematic viscosity of 180 cSt, synthetic hydrocarbon oil having excellent heat resistance, and polyphenyl ether oil is used, and lithium soap having good acoustic performance is used as a thickener. The amount of the thickener was increased to 20 to 30% by weight, and the short fiber structure was formed so as not to easily scatter. Therefore, it is possible to obtain a long-life grease composition for computer bearings, which is excellent in scattering property, acoustic performance, and torque performance.
【００３１】また添加剤としてスルホン酸塩，ナフテン
酸塩の群から選ばれた少なくとも１種の防錆添加剤０．
０１〜１．０重量％を含有することにより、上記性能を
損なわずに優れた防錆作用が得られる。At least one rust preventive additive selected from the group consisting of sulfonates and naphthenates as additives.
By containing 01 to 1.0% by weight, an excellent rust preventive action can be obtained without impairing the above performance.
【図１】飛散量測定装置の概略図である。FIG. 1 is a schematic diagram of a scattering amount measuring device.
【図２】摩擦トルク測定装置の概略図である。FIG. 2 is a schematic view of a friction torque measuring device.
【図３】実施例のグリースの摩擦トルクの一例を示すグ
ラフである。FIG. 3 is a graph showing an example of friction torque of the grease of the example.
【図４】比較例のグリースの摩擦トルクの一例を示すグ
ラフである。FIG. 4 is a graph showing an example of friction torque of grease of a comparative example.
【図５】飛散量に及ぼす粘度の影響を示すグラフであ
る。FIG. 5 is a graph showing the effect of viscosity on the amount of scattering.
【図６】飛散量に及ぼす増ちょう剤量の影響を示すグラ
フである。FIG. 6 is a graph showing the effect of the amount of thickener on the amount of scattering.
【図７】飛散量に及ぼすちょう度の影響を示すグラフで
ある。FIG. 7 is a graph showing the effect of consistency on the amount of scattering.
【図８】飛散量に及ぼす防錆剤量の影響を示すグラフで
ある。FIG. 8 is a graph showing the influence of the amount of rust preventive agent on the amount of scattering.
Ａ （被検用）軸受 A (for inspection) bearing
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｃ１０Ｍ 117:02） Ｃ１０Ｎ 20:02 30:04 40:06 50:10 (72)発明者 倉石 淳 神奈川県藤沢市辻堂7263−５ (72)発明者 尾崎 幸洋 東京都千代田区霞が関３丁目２番５号 昭 和シエル石油株式会社内 (72)発明者 土谷 哲夫 東京都千代田区霞が関３丁目２番５号 昭 和シエル石油株式会社内─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification code Internal reference number FI technical display location C10M 117: 02) C10N 20:02 30:04 40:06 50:10 (72) Inventor Jun Kuraishi 7263-5 Tsujido, Fujisawa-shi, Kanagawa (72) Inventor Yukihiro Ozaki 3-2-5 Kasumigaseki, Chiyoda-ku, Tokyo In-house Awa Ciel Oil Co., Ltd. (72) Tetsuo Tsuchiya 3-5-5 Kasumigaseki, Chiyoda-ku, Tokyo No. Showa Ciel Oil Co., Ltd.
Claims (2)
度を有する鉱油，合成炭化水素油およびポリフェニルエ
ーテル油の群から選ばれた少なくとも１種の基油７０〜
８０重量％と、化学構造式中に水酸基を含まないＣ12〜
Ｃ24高級脂肪酸のリチウム塩２０〜３０重量％とを含有
してなる電子計算機軸受用グリース組成物。1. At least one base oil selected from the group consisting of mineral oil, synthetic hydrocarbon oil and polyphenyl ether oil having a kinematic viscosity of 8 to 180 cSt at 40 ° C. 70 to
And 80 wt%, C 12 ~ free hydroxyl groups in the chemical structural formula
A grease composition for a computer bearing, which comprises 20 to 30% by weight of a lithium salt of a C 24 higher fatty acid.
ばれた少なくとも１種の防錆添加剤０．０１〜１．０重
量％を含有してなる請求項１記載の電子計算機軸受用グ
リース組成物。2. The grease for a computer bearing according to claim 1, which contains 0.01 to 1.0% by weight of at least one rust preventive additive selected from the group of sulfonates and naphthenates. Composition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16027091A JPH059489A (en) | 1991-07-01 | 1991-07-01 | Grease composition for bearing of electronic computor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16027091A JPH059489A (en) | 1991-07-01 | 1991-07-01 | Grease composition for bearing of electronic computor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH059489A true JPH059489A (en) | 1993-01-19 |
Family
ID=15711373
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16027091A Pending JPH059489A (en) | 1991-07-01 | 1991-07-01 | Grease composition for bearing of electronic computor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH059489A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001139975A (en) * | 1999-11-10 | 2001-05-22 | Thk Co Ltd | Grease composition and bearing unit using the same |
| JP2002069474A (en) * | 2000-09-01 | 2002-03-08 | Minebea Co Ltd | Rust preventive lubricating composition for plastic molding and molded article coated with it |
| JP2002340146A (en) * | 2001-05-17 | 2002-11-27 | Nsk Ltd | One-way clutch built-in type rotating transmission device |
| JP2003013083A (en) * | 2001-07-03 | 2003-01-15 | Cosmo Sekiyu Lubricants Kk | Grease composition |
| EP1533361A1 (en) * | 2002-08-21 | 2005-05-25 | Citizen Watch Co. Ltd. | Grease composition for precision equipment and timepiece containing the same |
| WO2009125775A1 (en) * | 2008-04-11 | 2009-10-15 | 出光興産株式会社 | Grease composition and direct-acting devices with the grease composition |
| JP2016138244A (en) * | 2015-01-21 | 2016-08-04 | セイコーインスツル株式会社 | Grease, rolling bearing, rolling bearing device and information recording and reproducing device |
| JP2018009062A (en) * | 2016-07-11 | 2018-01-18 | セイコーインスツル株式会社 | Grease, rolling bearing, rolling bearing device, and information recording regenerative apparatus |
-
1991
- 1991-07-01 JP JP16027091A patent/JPH059489A/en active Pending
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| JP4554744B2 (en) * | 1999-11-10 | 2010-09-29 | Ｔｈｋ株式会社 | Grease composition and bearing device using the same |
| JP2001139975A (en) * | 1999-11-10 | 2001-05-22 | Thk Co Ltd | Grease composition and bearing unit using the same |
| JP2002069474A (en) * | 2000-09-01 | 2002-03-08 | Minebea Co Ltd | Rust preventive lubricating composition for plastic molding and molded article coated with it |
| JP4559601B2 (en) * | 2000-09-01 | 2010-10-13 | ミネベア株式会社 | Plastic molding coated with anti-rust lubricating composition |
| JP2002340146A (en) * | 2001-05-17 | 2002-11-27 | Nsk Ltd | One-way clutch built-in type rotating transmission device |
| JP2003013083A (en) * | 2001-07-03 | 2003-01-15 | Cosmo Sekiyu Lubricants Kk | Grease composition |
| EP1533361A1 (en) * | 2002-08-21 | 2005-05-25 | Citizen Watch Co. Ltd. | Grease composition for precision equipment and timepiece containing the same |
| EP1533361A4 (en) * | 2002-08-21 | 2010-07-28 | Citizen Holdings Co Ltd | Grease composition for precision equipment and timepiece containing the same |
| JP2009256401A (en) * | 2008-04-11 | 2009-11-05 | Idemitsu Kosan Co Ltd | Grease composition and direct-acting device by using the grease composition |
| WO2009125775A1 (en) * | 2008-04-11 | 2009-10-15 | 出光興産株式会社 | Grease composition and direct-acting devices with the grease composition |
| CN101990570A (en) * | 2008-04-11 | 2011-03-23 | 出光兴产株式会社 | Grease composition and linear motion device using same |
| US8673830B2 (en) | 2008-04-11 | 2014-03-18 | Idemitsu Kosan Co., Ltd. | Grease composition and direct-acting devices with the grease composition |
| JP2016138244A (en) * | 2015-01-21 | 2016-08-04 | セイコーインスツル株式会社 | Grease, rolling bearing, rolling bearing device and information recording and reproducing device |
| JP2018009062A (en) * | 2016-07-11 | 2018-01-18 | セイコーインスツル株式会社 | Grease, rolling bearing, rolling bearing device, and information recording regenerative apparatus |
| CN107603696A (en) * | 2016-07-11 | 2018-01-19 | 精工电子有限公司 | Lubricating oil, rolling bearing, rolling bearing system and infromation recording/reproducing apparatus |
| US10968954B2 (en) | 2016-07-11 | 2021-04-06 | Seiko Instruments Inc. | Grease, antifriction bearing, antifriction bearing device, and information recording/reproducing device |
| CN107603696B (en) * | 2016-07-11 | 2021-09-28 | 精工电子有限公司 | Lubricating oil, rolling bearing device, and information recording/reproducing device |
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