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Lubricating oil compositions

A lubricating oil composition, the technology of the composition, applied in the directions of lubricating composition, petroleum industry, additives, etc., can solve the problems of low friction performance, depletion of organic molybdenum compounds or metal detergents, low friction characteristics, etc.

Inactive Publication Date: 2009-06-10
NIPPON OIL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the reduction of metal content (reduced ash content) and sulfur content in general-purpose low-friction lubricating oils such as fuel-type engine oils has not been sufficiently studied
It has been realized that sulfur-containing compounds as mentioned above can in fact significantly improve oxidation stability, but under the influence of sulfuric acid produced by their own deterioration or decomposition, they lead to the depletion of organic molybdenum compounds or metal detergents, and therefore have a negative effect on There will be some limitations in maintaining the initial low-friction characteristics for a long time
That is, conventional methods have limitations in providing engine oils that have excellent low friction properties, can achieve low ash and low sulfur contents, and have improved long-drain performance than before

Method used

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  • Lubricating oil compositions
  • Lubricating oil compositions
  • Lubricating oil compositions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0210] Examples 1 and 2, Comparative Example 1, and Reference Example 1

[0211] The lubricating oil compositions of the present invention (Examples 1 and 2) were prepared according to the formula shown in Table 1, and were used for comparison lubricating oil compositions (reference example 1 and comparative example 1).

[0212] The following performance evaluation test was performed on the obtained composition.

[0213] (1) Idling friction test of the whole engine

[0214] For the lubricating oil compositions shown in Table 1, an overall engine idling friction test was performed under the following conditions to measure the torsional force reduction rate (%) with respect to the lubricating oil composition of Comparative Example 1 used as a reference oil. The results are shown in Table 1.

[0215] Engine valve train system: DOHC, directly trigger the barrel valve train system

[0216] Oil temperature: 80℃, 95℃

[0217] Engine speed: 750-1,500rpm

[0218] (2) Friction test of valve...

Embodiment 3-7 and comparative Embodiment 2-4

[0238] According to the formulations shown in Tables 2 and 3, the lubricating oil compositions of the present invention (Examples 3-7) and the lubricating oil compositions for comparison (Comparative Examples 2-4) were prepared.

[0239] The following performance evaluation test was performed on the obtained composition.

[0240] (3) Idling friction test of the whole engine

[0241] For the lubricating oil compositions shown in Table 2, the overall engine idling friction test was conducted under the following conditions to measure the torsional force reduction rate (%) with respect to the lubricating oil composition of Comparative Example 3 used as a reference oil. The results are shown in Table 2.

[0242] Engine valve train system: DOHC, directly trigger the barrel valve train system

[0243] Oil temperature: 80℃, 95℃

[0244] Engine speed: 750-3,000rpm

[0245] (4) Friction test of valve train

[0246] For the lubricating oil compositions shown in Table 3, a valve train frictio...

Embodiment 8-11

[0278] Examples 8-11, Comparative Examples 5-7, and Reference Examples 2 and 3

[0279] According to the formula shown in Table 4, the lubricating oil composition of the present invention (Examples 8-11), and the lubricating oil composition for comparison (Comparative Examples 5-7 and Reference Examples 1 and 2) were prepared.

[0280] The friction performance test of the obtained composition was carried out under the following conditions: the load was 400N, the oscillation frequency was 50Hz, the stroke was 1.5mm, the oil temperature was 80°C, and the high frequency, linear vibration SRV tribometer of Optimol Instruments was used. The results are shown in Table 4.

[0281]

[0282] 1) Hydrogenated refined mineral oil, total aromatic content: 1.2% by mass, sulfur content: 10 mass ppm, kinematic viscosity at 100°C: 5.6 mm 2 / s, viscosity index: 125, NOACK evaporation loss: 8 mass%

[0283] 2) Zinc di(n-butyl) phosphate, phosphorus content: 13.2% by mass, sulfur content: 0% by mas...

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Abstract

A lubricating oil composition excellent in friction -reducing effect and long-drain performance (leading to a longer period of service) and particularly suitable for internal combustion engines, which comprises a lube base oil, a specific phosphorus compound in an amount of 0.005 to 0.5 % by mass based on the whole of the composition in terms of phosphorus, and at least one additive selected from the group consisting of (C) metallic detergents, (D) ashless dispersants, and (E) antioxidants, and further contains (F) a sulfur-containing organomolybdenum complex and (G) an ashless friction modifier and which satisfies prescribed requirements and has a sulfated ash content not exceeding a specified level.

Description

Technical field [0001] The present invention relates to a lubricating oil composition, and more particularly, to a lubricating oil composition having excellent low friction performance and improved long-drain properties, which is particularly suitable for internal combustion engines. Background technique [0002] Lubricants are commonly used in internal combustion engines and automatic transmissions to make them work smoothly. In particular, due to the performance improvement, the increase in output power, and the use in more severe operating conditions of the recently developed engines, the lubricating oil (engine oil) for internal combustion engines is required to have high characteristic performance. Therefore, general-purpose engine oils should be mixed with various additives used to meet the required performance, such as anti-wear agents, metal detergents, ashless dispersants, and antioxidants. Because fuel-based engine oil has a large energy loss on oil-related engine frict...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10M137/02C10M141/10C10M163/00C10M135/18C10M129/68C10M159/22C10N10/02C10N10/04C10N30/00C10N30/06C10N40/25C10M167/00
CPCC10M2215/28C10N2230/74C10M2223/04C10N2210/06C10N2230/45C10M2223/043C10M2219/068C10M2215/064C10M2207/289C10N2230/72C10M2209/103C10M169/044C10N2230/42C10M2203/1006C10M169/048C10M2207/262C10M2215/086C10N2210/02C10M2223/047C10M2205/02C10M2219/086C10N2210/01C10N2240/10C10M141/10C10M2223/049C10M2207/026C10M163/00C10N2230/06C10M2223/042C10M2227/09C10M2223/045C10N2010/02C10N2010/04C10N2010/12C10N2030/06C10N2030/42C10N2030/45C10N2030/72C10N2030/74C10N2040/25C10N2020/02
Inventor 八木下和宏矢口彰
Owner NIPPON OIL CO LTD