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Lubricant additive and lubricant composition

a technology of additives and lubricants, applied in the direction of lubricant compositions, liquid carbonaceous fuels, fuels, etc., to achieve excellent wear resistance, low friction coefficient, and sufficient lubrication

Inactive Publication Date: 2010-07-29
IDEMITSU KOSAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008]The lubricating oil additive provided according to the aspect of the invention, although not containing a metal (e.g., Mo), sulfur or phosphorus, is capable of providing sufficient lubrication. Specifically, the lubricating oil composition obtained by adding the lubricating oil additive to suitable base oil exhibits a low friction coefficient and excellent wear resistance.

Problems solved by technology

However, the metal-containing compounds disclosed in Patent Document 1 may be harmful to exhaust-purifying catalysts, so that ashless lubricating oil additives are being desired.

Method used

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  • Lubricant additive and lubricant composition
  • Lubricant additive and lubricant composition
  • Lubricant additive and lubricant composition

Examples

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examples

[0054]Next, the invention will be described in a further detail with reference to Examples, which by no means limit the invention.

[0055]Specifically, lubricating oil compositions as determined below were prepared, and the lubricating properties thereof (friction coefficients and wear resistance) were evaluated.

[0056]The components used for preparing the lubricating oil compositions are as follows.

(1) Base Oil:

[0057](1-1) Base oil A: mineral oil of 500 neutral fraction (HG500)

[0058](1-2) Base oil B: commercially-available oil containing antioxidants, antiwear agents and the like (general-purpose oil exemplarily used as gear oil)

(2) Additives

[0059](2-1) FM A: cholesterol stearate (manufactured by Wako Pure Chemical Industries, Ltd.)

[0060](2-2) FM B: cholesterol n-caprylate (manufactured by Tokyo Chemical Industry Co., Ltd.)

[0061](2-3) FM C: cholesterol acetate (manufactured by Tokyo Chemical Industry Co., Ltd.)

[0062](2-4) FM D: cholesterol n-octyl carbonate (manufactured by Tokyo Chem...

example 13

[0073]98.7 mass % of the base oil A (HG500), 0.3 mass % of a phenol antioxidant and 1 mass % of FM A were mixed together, and a thermal stability test (based on JIS K2540) was conducted at 120 degrees C. for 168 hours. No precipitate was observed at all.

[0074]As understandable from the above results, the lubricating oil additive according to the aspect of the invention was considerably excellent in friction-coefficient reduction and wear resistance, even though the additive contained no metal such as Mo or Zn, sulfur or phosphorus. Particularly notably, the friction reduction by the lubricating oil additive according to the aspect of the invention was much more excellent than the friction reduction by MoDTC (Comparative 1), i.e., an additive typically used so far for providing considerably excellent friction reduction. As understandable also from Examples 4 and 5, when added to commercially-available general-purpose lubricating oil, the lubricating oil additive according to the aspe...

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Abstract

A lubricating oil additive contains at least one steroid derivative selected from steroid saturated fatty acid ester, steroid carbonate ester and steroid ether. A lubricating oil composition added with the lubricating oil additive exhibits a low friction coefficient and excellent wear resistance, heat resistance and oxidation resistance stability.

Description

TECHNICAL FIELD[0001]The present invention relates to a lubricating oil additive and lubricating oil composition.BACKGROUND ART[0002]As the reduction in emission of carbon dioxide is being demanded in perspective of the global environment, more efficient utilization of energy is getting increasing attentions. For instance, machines including sliding portions can efficiently utilize the energy by reducing the friction energy with use of lubricating oil. In addition, prevention of wear, which is also one of the most important functions of the lubricating oil, leads to increase in lifetime of machines. Further, in perspective of waste reduction, the lubricating oil is demanded to have more long-drain capabilities, and to exhibit high oxidation stability and heat resistance.[0003]As additives capable of friction reduction, a sulfur-containing molybdenum composition such as molybdenum dithiocarbamate (MoDTC) has been in use (see e.g., Patent Document 1).[0004]Patent Document 1: JP-A-07-1...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10M105/34C10M129/16C10M129/12
CPCC10M129/16C10M129/70C10M129/84C10M129/86C10M129/95C10M159/02C10N2240/10C10M2207/125C10M2207/32C10N2230/06C10N2230/08C10N2230/10C10N2240/04C10M2207/04C10N2030/10C10N2030/08C10N2030/06C10N2040/04C10N2040/25
Inventor SEKIGUCHI, HIROKIOKADA, TAHEI
Owner IDEMITSU KOSAN CO LTD
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