Lubricant oil composition for rotary compressor

Inactive Publication Date: 2015-11-26
IDEMITSU KOSAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a lubricating oil composition for a rotary compressor that has high extreme pressure properties while maintaining high oxidation stability. Additionally, this lubricating oil composition prevents the formation of sludge and achieves both excellent oxidation stability and extreme pressure property.

Problems solved by technology

In the field of an equipment oil, such as a compressor oil, a turbine oil and a hydraulic oil, particularly in a compressor oil for a gear-driven compressor and the like, excellent oxidation stability and extreme pressure property have been demanded, but it has been difficult to achieve both of them simultaneously.
Specifically, it has been known that an acidic phosphate ester amine salt and a sulfur-phosphorus (SP) extreme pressure additive, which have been used since they are generally said to have excellent oxidation stability, are generally insufficient in extreme pressure property, whereas a zinc dialkyldithiophosphate (ZnDTP), which has been said to have excellent extreme pressure property, significantly impairs the oxidation stability of the oil.

Method used

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  • Lubricant oil composition for rotary compressor
  • Lubricant oil composition for rotary compressor
  • Lubricant oil composition for rotary compressor

Examples

Experimental program
Comparison scheme
Effect test

example

[0057]The present invention will be described more specifically with reference to examples below, but the present invention is not limited to the examples.

[0058]Properties of Lubricating Oil Composition

[0059]The properties of the lubricating oil composition were measured in the following manners.

(1) kinetic viscosity (40° C.): according to JIS K2283

(2) acid value (indicator method): according to JIS K2501

(3) copper strip corrosion (100° C., 3 hours): according to JIS K2513

(4) sulfur content (ppm): according to JIS K2541

(5) nitrogen content (ppm): according to JIS K2609

(6) phosphorus content (ppm): ICP analysis

(7) zinc content (ppm): ICP analysis

Evaluation Items and Evaluation Methods

(1) Load Bearing Test (Shell EP Test)

[0060]The test was performed according to ASTM D2783 with a four-ball tester under conditions of a rotation number of 1,800 rpm and an oil temperature of from 18.3 to 35.0° C. The load wear index (LWI) was obtained from the last non-seizure load (LNL) and the weld loa...

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Abstract

A lubricating oil composition for a rotary compressor capable of imparting high extreme pressure property while maintaining high oxidation stability is provided by mixing, in (a) a base oil, (b) an antioxidant and (c) a dithiophosphate ester compound represented by the formula (I) in an amount of 0.05% by mass or more and less than 2.0% by mass based on the total composition.

Description

TECHNICAL FIELD[0001]The present invention relates to a lubricating oil composition for a rotary compressor. In particular, the present invention relates to a lubricating oil composition for a rotary compressor, in which the lubricating oil composition is capable of imparting high extreme pressure property while maintaining high oxidation stability.BACKGROUND ART[0002]In the field of an equipment oil, such as a compressor oil, a turbine oil and a hydraulic oil, particularly in a compressor oil for a gear-driven compressor and the like, excellent oxidation stability and extreme pressure property have been demanded, but it has been difficult to achieve both of them simultaneously. Specifically, it has been known that an acidic phosphate ester amine salt and a sulfur-phosphorus (SP) extreme pressure additive, which have been used since they are generally said to have excellent oxidation stability, are generally insufficient in extreme pressure property, whereas a zinc dialkyldithiophos...

Claims

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Application Information

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IPC IPC(8): C10M141/10
CPCC10M141/10C10M2203/1006C10M2203/1025C10M2207/026C10M2207/262C10M2209/084C10M2215/064C10M2215/065C10M2215/223C10M2219/085C10M2223/043C10M2223/045C10M2223/06C10M2229/02C10M2223/047C10N2010/04C10N2030/04C10N2030/06C10N2030/10C10N2040/30
InventorSATO, TOKUE
OwnerIDEMITSU KOSAN CO LTD