Lubricating oil composition for internal combustion engine

a technology of lubricating oil and composition, which is applied in the direction of lubricant composition, organic chemistry, base materials, etc., can solve the problems of catalyst poisoning and dpf clogging, and the reduction of a phosphorus component and a zinc (ash) component is not achieved, and achieves low sulfur content, low ash content, and low phosphorus content

Inactive Publication Date: 2010-01-14
IDEMITSU KOSAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0015]According to the present invention, a lubricating oil composition for internal combustion engines, which, despite its low ash content, low phosphorus content and low sulfur content, can maintain excellent wear resistance, exhibits excellent heat resistance, can extend the lubricating oil change interval and has long service life can be provided.

Problems solved by technology

When ZnDTP is used as an extreme-pressure additive in the same manner as above, the zinc component contained in ZnDTP deposits on DPF may cause clogging of the filter.
Though the composition can reduce the sulfur content as a replacement for ZnDTP, reduction of a phosphorus component and a zinc (ash) component is not achieved.
Thus, problems of catalyst poisoning and clogging of DPF remain unsolved.
Namely, the composition is still unsatisfactory as a lubricating oil composition.
As described above, it is difficult to decrease a zinc component, a phosphorus component and a sulfur component without reducing the wear resistance and antioxidizing properties of an extreme-pressure additive.
Such a sulfur-based antioxidant, however, has a problem because it causes an increase of the acid value by hydrolysis.
Sulfur-based compounds having a polysulfide (tri- or higher polysulfide) structure has a problem that it is highly corrosive to non-iron metals.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

Preparation of Bis(N-Octoxycarbonylmethyl) Disulfide

[0062]Octyl ester of mercaptoacetic acid was subjected to oxidative coupling according to the production method for the compound represented by the above general formula (I) to obtain bis(n-octoxycarbonylmethyl) disulfide. No tri- or higher polysulfides were detected in the obtained disulfide compound. A sulfur content was found to be 15.8% by mass.

[0063]Namely, into a 100 ml recovery flask, 40.8 g of octyl ester of mercaptoacetic acid and 30.8 g of dimethyl sulfoxide were placed, and the resultant mixture was heated in an oil bath at 120° C. for 8 hours, After having been cooled, the obtained reaction mixture was dissolved into 100 ml of toluene and washed ten times to remove unreacted dimethyl sulfoxide. Toluene was then removed by distillation under a reduced pressure to obtain 30.5 g of bis(n-octoxycarbonylmethyl) disulfide.

preparation example 2

[0064]Composition containing oil-soluble molybdenum Bis-succinimde was synthesized by reacting a mixture of polybutenyl (molecular weight: 1,000) succinic anhydride (PIBSA) and a polyethylene polyamine oligomer (commercially available as Polyethyleneamine E-100 from Huntsman Chemical Company) with a molar ratio of the amine to PIBSA of 0.5:1. The produced bis-succinimde (250 g) and 162.5 g of neutral oil were placed in a glass reactor equipped with a thermoregulator, a mechanical agitator and a water-cooling unit. The mixture was heated to 70° C. being a reaction temperature for forming a molybdic acid salt. Then, 26.6 g of molybdenum oxide and 45.8 g of water were added to the reactor while maintaining the reaction temperature unchanged. The temperature of the reactor was then maintained at 70° C. for 28 hours. After the salt forming reaction of molybdic acid had been completed, the product was distilled for 30 minutes at a temperature of 99° C. and a pressure of 25 mmHg (absolute)...

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Abstract

A lubricating oil composition for an internal combustion engine, which includes a base oil, (A) at least one member selected from the group consisting of disulfide compounds represented by the general formula (I):R1OOC-A1-S—S-A2-COOR2  (I)and disulfide compounds represented by the general formula (II):R7OOC—CR9R10—CR11(COOR8)—S—S—CR16(COOR13)—CR14R15—COOR12  (II),and (B) at least one member selected from the group consisting of alkali metal-based detergents and alkaline earth metal-based detergents, the component (B) being present in an amount of 10 to 2,000 ppm by mass in terms of metal content.The lubricating oil composition has a low ash content, a low phosphorous content and a low sulfur content. But, Nonetheless, it can maintain wear resistance, has excellent heat resistance, can extend the lubricating oil change interval and has a long service life.

Description

TECHNICAL FIELD[0001]The present invention relates to a lubricating oil composition for an internal combustion, particularly to a lubricating oil composition suitable for use in an internal combustion engine such as a gasoline engine, a diesel engine or a gas engine. More specifically, the present invention is directed to a lubricating oil composition which, despite its low ash content, low phosphorus content and low sulfur content, can maintain excellent wear resistance, exhibits excellent heat resistance, can extend the lubricating oil change interval and has a long service life.BACKGROUND ART[0002]A lubricating oil for an internal combustion engine mainly functions to lubricate various sliding portions such as piston rings, cylinder liners, crankshafts, connecting rods and a valve-operating mechanism including a cam and a valve-lifter. In addition, the lubricating oil functions to cool the inside of the engine and to disperse sludge and uncombusted residues of the fuel.[0003]Thus...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10M105/36
CPCC10M129/10C10N2240/402C10M135/10C10M135/26C10M159/22C10M159/24C10M169/045C10M2207/023C10M2207/028C10M2207/044C10M2219/044C10M2219/046C10M2219/082C10M2219/085C10N2210/01C10N2210/02C10N2230/06C10N2230/08C10N2230/42C10N2230/43C10N2230/45C10N2230/72C10N2240/04C10N2240/08C10N2240/10C10M129/54C10N2030/08C10N2010/02C10N2030/43C10N2030/45C10N2030/42C10N2030/72C10N2030/06C10N2040/04C10N2010/04C10N2040/25C10N2040/08C10N2040/24
Inventor ITO, KOKI
Owner IDEMITSU KOSAN CO LTD
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