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Lubricant composition and lubricating method

Inactive Publication Date: 2018-11-15
IDEMITSU KOSAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is a lubricating oil composition that has a high flash point of 250°C or higher and is stable over a long period of time. It can maintain excellent oil oxidation stability even in high-temperature environments.

Problems solved by technology

The lubricating oil composition used for a long period of time in high-temperature environments often involves risks of performance degradation owing to oxidation and sludge precipitation owing to oxidation.
The precipitated sludge may cause problems of, for example, damage to bearings owing to heat generation after adhesion to rotor bearings, occurrence of clogging of filters arranged in circulation lines, control system operation failure owing to deposition on control valves, etc.

Method used

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  • Lubricant composition and lubricating method

Examples

Experimental program
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Effect test

examples

[0156]Next, the present invention is described further specifically with reference to Examples, but the present invention is not limited to these Examples.

[Method for Measuring Various Physical Data]

(1) Weight Average Molecular Weight (Mw)

[0157]According to a method of GPC (gel permeation chromatography), the measurement was carried out in terms of standard polystyrene. Specifically, the following apparatus was used for the measurement under the following condition.

GPC apparatus: Waters 1515 Isocratic HPLC Pump+Waters 2414 Refractive Index Detector (both by Waters Corporation)

Column: Two columns of “TSKgel Super Multipore HZ-M” (by Tosoh Corporation) were connected.

Column temperature: 40° C.

Eluent: tetrahydrofuran

Flow rate: 0.35 mL / min

Detector: refractive index detector

(2) Kinematic Viscosity

[0158]Kinematic viscosity at different temperatures was measured according to JIS K2283.

(3) Viscosity Index

[0159]Measured according to JIS K2283.

(4) Acid Number

[0160]Measured according to the in...

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Abstract

Provided is a lubricating oil composition containing a refined paraffinic mineral oil (A) and an alkylbenzene (B) having a flash point of 160° C. or higher, and having a flash point of 250° C. or higher. The lubricating oil composition has a high flash point of 250° C. or higher and has an excellent long lifetime to such an extent that the lubricating oil composition can maintain excellent oxidation stability even in long-term use in high-temperature environments.

Description

TECHNICAL FIELD[0001]The present invention relates to a lubricating oil composition, and to a lubricating method using the lubricating oil composition.BACKGROUND ART[0002]A lubricating oil composition for use for turbines such as steam turbines, gas turbines, etc., rotary gas compressors, hydraulic machines and the like is used to circulate in a system in high-temperature environments for a long period of time.[0003]The lubricating oil composition used for a long period of time in high-temperature environments often involves risks of performance degradation owing to oxidation and sludge precipitation owing to oxidation. The precipitated sludge may cause problems of, for example, damage to bearings owing to heat generation after adhesion to rotor bearings, occurrence of clogging of filters arranged in circulation lines, control system operation failure owing to deposition on control valves, etc.[0004]Consequently, a lubricating oil composition for use for turbines, rotary gas compres...

Claims

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Application Information

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IPC IPC(8): C10M169/04C10M101/02C10M105/06C10M111/02C10M145/10C10M155/02C10M133/12C10M161/00
CPCC10M169/044C10M101/02C10M105/06C10M111/02C10M145/10C10M155/02C10M133/12C10M161/00C10M2203/1025C10M2203/065C10M2209/084C10M2229/02C10M2215/26C10N2230/18C10N2230/10C10N2230/02C10N2240/14C10N2240/30C10N2240/08C10M2205/06C10M2215/064C10M2215/065C10M2215/066C10N2030/02C10N2030/10C10N2030/18C10N2040/08C10N2040/30C10N2040/135
Inventor SHINODA, JITSUO
Owner IDEMITSU KOSAN CO LTD
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