System lubricating oil composition for crosshead-type diesel engine

a cross-head type, lubricating oil technology, applied in the direction of lubricant composition, liquid carbonaceous fuels, fuels, etc., can solve the problems of corroding cylinders of sulfuric acid generated by the combustion of fuel, increasing viscosity, etc., to inhibit the deterioration of fuel efficiency and suppress the increase of viscosity

Inactive Publication Date: 2012-10-11
JX NIPPON OIL & ENERGY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0014]The use of the system lubricating oil composition for a crosshead-type diesel engine of the present invention makes it possible to suppress the viscosity from increasing, resulting in inhibition of fuel efficiency deterioration.

Problems solved by technology

Furthermore, since for this engine, a high-sulfur content fuel is generally used for the economy reason, it has a problem that acidic components such as sulfuric acid generated by the combustion of the fuel corrode a cylinder.
However, a crosshead-type engine for ships has a problem that the system oil is eventually increased in viscosity by being mixed with a drip oil, and how such viscosity increase should be suppressed has become a longstanding problem.

Method used

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  • System lubricating oil composition for crosshead-type diesel engine
  • System lubricating oil composition for crosshead-type diesel engine
  • System lubricating oil composition for crosshead-type diesel engine

Examples

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examples

[0077]The present invention will be described in more detail with reference to the following Examples and Comparative Examples but are not limited thereto.

examples 1 to 18

, and Comparative Examples 1 to 4

[0078]Lubricating oil compositions of the present invention (Examples 1 to 18) and those for comparison (Comparative Examples 1 to 4) as set forth in Tables 1 and 2 were prepared. Each of the resulting compositions was subjected to a hot tube test, and the results thereof are also set forth in Tables 1 and 2. For Examples 1 to 7 and 10 to 16 and Comparative Examples 1, 3 and 4, the content of the polymer compound and the ratio of the base oil were adjusted so that the 100° C. kinematic viscosity of each composition mixed with additives was 11.5 mm2 / s.

[0079](Base Oil)

[0080]Base Oil A: 100 neutral (kinematic viscosity at 100° C.: 4.42 mm2 / s)

[0081]Base Oil B: 250 neutral (kinematic viscosity at 100° C.: 7.12 mm2 / s)

[0082]Base Oil C: 500 neutral (kinematic viscosity at 100° C.: 10.8 mm2 / s)

[0083]Base Oil D: 150 bright stock (kinematic viscosity at 100° C.: 31.7 mm2 / s)

[0084](Additive)

[0085](1) Polymer Compound

[0086]A-1: Polyisoprene star polymer (polymer wh...

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Abstract

The present invention provides a system lubricating oil composition for a crosshead-type diesel engine, which can prevent fuel efficiency deterioration by suppressing the viscosity increase and comprises a mineral base oil and/or a synthetic base oil, (A) (a-1) a star polymer having a vinyl aromatic hydrocarbon structure in the molecule and/or (a-2) an ethylene-α-olefin copolymer or a hydrogenated compound thereof and having a base number of 4 to 20 mgKOH/g and a 100° C. kinematic viscosity of 7.5 to 15.0 mm2/s.

Description

TECHNICAL FIELD[0001]The present invention relates to a system lubricating oil composition for a crosshead-type diesel engine.BACKGROUND ART[0002]For a crosshead-type diesel engine, a cylinder oil for lubricating the friction point between the cylinders and pistons and a system oil for lubricating and cooling other portions have been used. The cylinder oil is required to have a suitable viscosity needed to lubricate a friction portion between a cylinder and a piston (piston ring) and a function to maintain detergency needed to allow a piston and a piston ring to move appropriately. Furthermore, since for this engine, a high-sulfur content fuel is generally used for the economy reason, it has a problem that acidic components such as sulfuric acid generated by the combustion of the fuel corrode a cylinder. In order to avoid this problem, the cylinder oil is required to have a function to neutralize the acidic components such as sulfuric acid so as to prevent corrosion.[0003]Whereas, t...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10M143/10C10M143/04C10M137/10C10M143/12
CPCC10M2203/1025C10M2203/1006C10M2203/1085C10N2230/52C10N2230/54C10M2207/262C10M143/10C10M2223/045C10N2240/10C10M143/02C10N2220/029C10M2205/022C10N2240/104C10M2209/084C10N2240/102C10M2207/028C10N2230/08C10M2205/026C10N2220/022C10M143/08C10M2219/044C10M2205/04C10N2230/10C10N2230/02C10M2215/28C10M2205/06C10M2205/028C10N2210/02C10M2205/024C10N2020/073C10N2020/02C10N2030/02C10N2030/10C10N2030/08C10N2030/52C10N2030/54C10N2040/252C10N2040/255C10N2040/25C10N2010/04
Inventor TAKESHIMA, SHIGEKI
Owner JX NIPPON OIL & ENERGY CORP
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