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Lubricant for oil retaining bearing

a technology of oil retaining bearing and lubricant, which is applied in the direction of liquid degasification, mechanical equipment, separation processes, etc., can solve the problems of lubrication failure of the bearing, damage of the bearing, and disordered mr head of the hard disk drive, etc., and achieves excellent heat resistance, low vapor pressure, and low flammability.

Inactive Publication Date: 2009-03-12
IDEMITSU KOSAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0017]According to the present invention, there can be provided a lubricant for an oil retaining bearing which contains an ionic liquid as its base oil and which has a low vapor pressure, low flammability, excellent heat resistance and ability to suppress the emanation of low volatile components and decomposed gases during use, or a lubricant for an oil retaining bearing which contains an ionic liquid as an antistatic agent, which has antistatic property and which is capable of grounding the static electricity generated by flow charging of the lubricant.

Problems solved by technology

Thus, a thoughtless use of a low viscosity lubricating oil might cause a loss of the lubricating oil, resulting in a lubrication failure in the bearing, and in the worst case, damage of the bearing.
Upon discharging, there is a fear that the important electronic parts (e.g., MR head of a hard disk drive) may become disordered.
From this viewpoint, whilst the aforementioned conventional lubricating oils for bearings satisfy both low viscosity and low volatility, they still have a problem because they have a large volume resistivity and tend to generate static electricity.
However, a lubricating oil containing such microparticles may cause anomalous wear of the bearing, because the microparticles are present on the sliding surface at the time of starting or stopping the motor.
However, the antistatic agent of such an organic metal salt cannot exhibit satisfactory antistatic property unless it is used in a large amount.
In addition, the antistatic agent has a problem because it is deteriorated during long-term use and converted into an oil-insoluble inorganic salt (sludge).
This technique does not use an ionic liquid in a lubricant for an oil retaining bearing.

Method used

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Examples

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examples 7 to 14

[0136]Lubricants having compositions shown in Tables 2-1 and 2-2 were prepared and tested for various properties. The results are shown in Tables 2-1 and 2-2.

TABLE 2-1Examples718910LubricantBase oilIonic liquid 5100—908060(mass %)Ionic liquid 1100102040Evaluation40° C. Kinematic viscosity (mm2 / s)85.2922.4165.3945.7344.46Viscosity index123160—162130Pour point (° C.)−7.5−20.0−27.5−37.5−35.0Total acid number (mgKOH / g)0.060.290.080.110.15Flash point (C.O.C)3003003003003005% Mass reduction temperature (° C.)372.0411.3373.2380.2397.6Load resistance test (LWI)15221512151115231517Wear resistance test (mm)0.50.430.450.460.42

TABLE 2-2Examples11121314LubricantBase oilIonic liquid 550402010(mass %)Ionic liquid 150608090Evaluation40° C. Kinematic viscosity (mm2 / s)38.6535.3135.7324.63Viscosity index143160185162Pour point (° C.)−45.0−37.5−40.0−27.5Total acid number (mgKOH / g)0.180.200.240.27Flash point (C.O.C)3003003003005% Mass reduction temperature401.4406.1407.0408.9(° C.)Load resistance test (L...

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Abstract

A lubricant for an oil retaining bearing containing 1 to 100% by mass of an ionic liquid. The lubricant has a low vapor pressure, low flammability, excellent heat resistance and ability to suppress the emanation of low volatile components and decomposed gases during use, or a lubricant for an oil retaining bearing which has antistatic property and is capable of grounding the static electricity generated by flow charging of the lubricant.

Description

TECHNICAL FIELD[0001]The present invention relates to a lubricant for an oil retaining bearing. More specifically, the present invention is directed to a lubricant for an oil retaining bearing which contains an ionic liquid in its base oil and which has a low vapor pressure, low flammability, excellent heat resistance and ability to suppress the emanation of low volatile components and decomposed gases during use, or a lubricant for an oil retaining bearing which contains an ionic liquid as an antistatic agent, which has antistatic property and which is capable of grounding the static electricity generated by flow charging of the lubricant.BACKGROUND ART[0002]In recent years, as bearings for spindle motors for driving, typically, magnetic disks and optical disks, there have been increasing cases in which sliding bearings, such as fluid bearings and sintered oil retaining bearings are used because of their silent operation and durability. With such a bearing, a shaft is separated by ...

Claims

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Application Information

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IPC IPC(8): C10M133/00C10M169/04
CPCC10M169/04F16C2202/32C10M2215/04C10M2215/221C10M2215/224C10M2219/083C10M2223/041C10N2220/00C10N2220/02C10N2220/022C10N2220/04C10N2220/13C10N2230/00C10N2230/02C10N2230/06C10N2230/08C10N2230/18C10N2230/28C10N2230/74C10N2240/02C10N2240/204H02K5/1675H02K11/0089C10M171/00F16C33/109C10M2219/044C10N2020/00C10N2020/02C10N2030/00C10N2030/02C10N2030/06C10N2030/08C10N2030/18C10N2040/02C10N2040/18C10N2020/01C10N2020/077C10N2020/085C10N2030/28C10N2030/74F16C33/104H02K11/40C10M105/60C10M105/72
Inventor KAMIMURA, HIDETOSHIMODA, SHUKICHIHASHIMOTO, KATSUMI
Owner IDEMITSU KOSAN CO LTD
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