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Biodegradable lubricating oil composition

a lubricating oil and biodegradable technology, applied in the direction of lubricant compositions, additives, base materials, etc., can solve the problems of vegetable oils having thermal or oxidative instability, vegetable oils not widely used in japan, and high cost, and achieve excellent biodegradability, low pour point, and high viscosity index

Inactive Publication Date: 2009-07-09
IDEMITSU KOSAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0102]The biodegradable lubricating oil composition of the present invention comprises a synthetic ester base oil having excellent biodegradability, has well-balanced properties including lubricating performance, and is preferably used, for example, as a hydraulic fluid, automotive lubricating oil, metal-working oil, and so on.

Problems solved by technology

However, biodegradable lubricating oils have not widely been used in Japan because of their higher cost compared with conventional mineral oil-based lubricating oils, in spite of high attention.
However, vegetable oils have a problem of thermal or oxidative instability as well as unstable supply despite low cost, and polyalkyleneglycols have a problem of a poor suitability for use with sealing materials despite low cost and good thermal stability.
Therefore, although synthetic esters are becoming more popular as biodegradable lubricating oils in Japan, they still have a substantial weakness against a mineral oil-based lubricating oil in terms of the cost and oxidative stability.
Although the above-mentioned biodegradable lubricating oils are satisfactory with respect to lubricity and oxidative stability, they still have problems of a high pour point, substantial metal dissolution of non-ferrous metals used for materials for hydraulic machinery, extreme swelling of sealing materials, and so on.

Method used

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Examples

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examples

[0055]The present invention is further described by the following examples but not limited thereto.

[0056]In addition, properties of the lubricating oil composition in each example were determined by the following methods:

General Properties:

[0057](a) Kinematic viscosity at 40° C.: Determined according to JIS K 2283 test method.[0058](b) Viscosity index: Determined according to JIS K 2283 test method.[0059](c) Acid value: Determined according to JIS K 2501 test method.[0060](d) Hydroxyl value: Determined by the pyridine-acetyl chloride method according to JIS K 0070 test method.[0061](e) Flash point: Determined by using the Cleveland Open Cup (COC) tester according to JIS K 2265 test method.[0062](f) Pour point: Determined according to JIS K 2269 test method.[0063](g) Antirust performance: Determined according to JIS K 2510 test method, wherein the rust formation after 24 hours of the test initiation was inspected by visual observation using distilled water at 60° C.

(2) Biodegradabili...

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Abstract

[PROBLEMS] To provide a biodegradable lubricating oil composition which has excellent biodegradability, a high viscosity index, a low pour point, a high flash point, being satisfactory with lubricity, oxidative stability, property of preventing the corrosion of iron and non-ferrous metals, and suitability for use with sealing materials.[MEANS FOR SOLVING THE PROBLEMS] A biodegradable lubricating oil composition comprising (A) a synthetic ester base oil comprising at least 50 mass % hindered ester of an aliphatic monocarboxylic acid with an aliphatic hindered polyol which has one or more quaternary carbon atoms per molecule and in which at least one of the quaternary carbon atoms has one to four methylol groups bonded thereto and (B) ingredients which are (a) 0.1 to 5.0 mass % phenolic antioxidant, (b) 0.01 to 2.0 mass % calcium sulfonate having a low base number, and (c) 0.01 to 1.0 mass % triazole compound, and has the degree of biodegradation of 60% or higher when examined by the test for the degree of microbial degradation of chemical substances according to the OECD Test Guideline 301C method.

Description

TECHNICAL FIELD[0001]The present invention relates to a biodegradable lubricating oil composition. More specifically, it relates to a synthetic ester-based biodegradable lubricating oil composition which has excellent biodegradability, a high viscosity index, a low pour point, a high flash point, being satisfactory with lubricity, oxidative stability, property of preventing the corrosion of iron and non-ferrous metals, and suitability for use with sealing materials.BACKGROUND ART[0002]In recent years, considerable attention has been paid to a biodegradable lubricating oil in the field of lubricant application due to environmental pollution-control measures. Research and development was started and commercially available products were manufactured in this field from early 1990's in Japan. However, biodegradable lubricating oils have not widely been used in Japan because of their higher cost compared with conventional mineral oil-based lubricating oils, in spite of high attention. Jap...

Claims

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Application Information

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IPC IPC(8): C10M125/22C10M105/34C10M105/38C10M129/10C10M129/76C10M133/44C10M135/10C10M159/24C10M169/04C10N10/04C10N20/00C10N20/02C10N30/00C10N30/02C10N30/06C10N30/08C10N30/10C10N30/12C10N40/08C10N40/20C10N40/26
CPCC10M169/04C10M135/10C10M2207/026C10M2207/2835C10M2207/289C10M2207/2895C10M2215/223C10M2219/044C10M2219/046C10N2210/02C10N2220/10C10N2230/02C10N2230/06C10N2230/08C10N2230/10C10N2230/12C10N2230/64C10N2240/04C10N2240/042C10N2240/044C10N2240/08C10N2240/10C10N2240/40C10N2240/401C10M2207/0225C10M133/44C10M129/10C10M2207/1213C10M2207/1253C10N2010/04C10N2020/081C10N2030/02C10N2030/08C10N2030/06C10N2030/10C10N2030/12C10N2030/64C10N2040/042C10N2040/044C10N2040/04C10N2040/25C10N2040/08C10N2040/20C10N2040/22
Inventor KAWASAKI, HIROSHI
Owner IDEMITSU KOSAN CO LTD
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