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Lubricant composition for fluid dynamic bearing

A technology of lubricating oil composition and fluid bearing, applied in the direction of lubricating composition, petroleum industry, base material, etc., can solve the problems of easy hydrolysis, corrosion of metal materials, etc., achieve low evaporation, low viscosity characteristics, good low temperature fluidity Effect

Inactive Publication Date: 2007-07-25
IDEMITSU KOSAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] However, the above-mentioned lubricating oils for fluid bearings using polyol esters as base oils do not necessarily satisfy the above-mentioned required properties, and have problems such as being easily hydrolyzed and possibly corroding metal materials due to the presence of ester bonds.

Method used

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  • Lubricant composition for fluid dynamic bearing
  • Lubricant composition for fluid dynamic bearing
  • Lubricant composition for fluid dynamic bearing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0213] Next, the present invention is further described in detail through examples, but the present invention is not limited by these examples.

[0214] Various properties of lubricating oils were measured according to the following methods.

[0215] (1) Kinematic viscosity

[0216] Measured at -100°C and -20°C according to JIS K2283.

[0217] (2) Viscosity index

[0218] Measurement was performed in accordance with JIS K2283.

[0219] (3) Pour point

[0220] Measurement was performed in accordance with JIS K2269.

[0221] (4) Evaporation loss

[0222]According to the thermal stability test of JIS C201, the evaporation loss amount was measured at 120 degreeC and heat-processing for 24 hours.

[0223] (5) Hydrolysis test

[0224] Put 75g of sample oil, 25g of distilled water and weighed copper catalyst into a glass bottle, seal it, and rotate the glass bottle in a constant temperature tank at 93°C for 48 hours, then measure the mass loss of the copper catalyst and the to...

preparation example 1

[0230] 300 g of 2-hexyldecanol, 300 g of 1-bromodecane, 30 g of tetrabutylammonium bromide, and 500 g of 30% by mass sodium hydroxide aqueous solution were charged into a 2-liter glass flask, and stirred and reacted at 50° C. for 20 hours.

[0231] After the reaction, the reaction mixture was transferred to a separatory funnel, the aqueous phase was removed by filtration, and the remaining organic phase was washed 5 times with 500 ml of water.

[0232] 2-Hexyldecyldecyl ether was isolated from the organic phase by distillation under reduced pressure.

[0233] Next, using branched eicosanol obtained from the dimer of decene and 2-hexyldecanol and 2-octyldodecanol obtained by the Guerbet reaction, branched eicosanol was obtained by a similar reaction. Alkyl butyl ether, 2-hexyl decyl nonyl ether, 2-octyl dodecyl pentyl ether, 2-octyl dodecyl hexyl ether.

preparation example 2

[0235] 317g of 3,5,5-trimethylhexanol, 216g of 1,4-dibromobutane, 14.3g of tetrabutylammonium bromide, and 442g of 52% by mass sodium hydroxide aqueous solution were charged into a 2-liter glass flask , and stirred the reaction at 70 °C for 8 hours.

[0236] After the reaction, the reaction mixture was transferred to a separatory funnel, the aqueous phase was removed by filtration, and the remaining organic phase was washed 5 times with 500 ml of water.

[0237] 1,4-Bis(3,5,5-trimethylhexyloxy)butane was separated from the organic phase by distillation under reduced pressure.

[0238] Below, using 3,5,5-trimethylhexanol, 2-ethylhexanol, nonanol, decanol, 3,7-dimethyloctanol, octanol and a mixed alcohol of octanol and nonanol, by A similar reaction gives 1,5-bis(3,5,5-trimethylhexyloxy)pentane, 1,6-bis(3,5,5-trimethylhexyloxy)hexane, 1, 8-bis(3,5,5-trimethylhexyloxy)octane, 1,8-bis(2-ethylhexyloxy)octane, 1,5-bis(nonyloxy)-3- Methylpentane, 1,5-bis(decyloxy)-3-methylpentane,...

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Abstract

Disclosed is a lubricant composition for fluid dynamic bearings which contains, as a base oil, 50-100% by mass of an ether compound having at least one ether bond and 11-34 carbon atoms, and has a kinematic viscosity at 100 DEG C of not less than 2.2 mm2 / s. Such a lubricant composition for fluid dynamic bearings has good low-temperature fluidity and such excellent viscosity characteristics that viscosity decrease is small even in the high temperature range. The lubricant composition further has low evaporativity, energy saving properties and heat resistance stability, and is thus suitable for compact fluid dynamic bearings which are rotated at high speed.

Description

technical field [0001] The present invention relates to a lubricating oil composition for fluid bearings. More specifically, the present invention relates to a small-sized fluid used in high-speed rotation with low viscosity, high viscosity index and excellent low-temperature fluidity, low evaporation and energy-saving properties, etc. A lubricating oil composition for fluid bearings suitable for use in bearings. Background technique [0002] In the past, ball bearings or roller bearings have been used as bearings in motors mounted on hard disk drives, etc., but in response to the need for motor miniaturization, low vibration, and low noise, fluid bearings have been developed in recent years and have been realized. Practical. [0003] On the other hand, video / audio equipment and personal computers have also made remarkable progress in size and weight reduction, increase in capacity, and speed-up of information processing. [0004] Various rotating devices are used in these...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10M105/18C10M169/04C10M129/10C10M133/04C10N20/00C10N20/02C10N30/00C10N30/02C10N30/06C10N30/08C10N40/02
CPCC10M2209/1065C10M2207/0406C10N2230/74C10M2223/04C10M2215/042C10M107/34C10M2219/066C10N2240/204C10N2230/02C10M2215/064C10M2207/289C10M2209/1033C10N2220/028C10N2220/022C10N2220/021C10M2215/082C10M2207/026C10M169/04C10M2223/049C10N2230/06C10N2230/66C10M105/18C10N2230/08C10N2240/02C10N2220/00C10M2209/1055C10M2219/106C10N2020/00C10N2020/04C10N2020/071C10N2020/02C10N2030/02C10N2030/66C10N2030/08C10N2030/06C10N2030/74C10N2040/02C10N2040/18C10M2209/1085
Inventor 冈田太平
Owner IDEMITSU KOSAN CO LTD
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