Lubricant composition for crosshead ship engine crankcase system

A technology of lubricating oil composition and system lubricating oil, applied in the directions of lubricating composition, petroleum industry, additives, etc., can solve problems such as unfavorable piston and engine cleaning, lubrication, viscosity increase, shortening of lubricating oil service life, etc.

Active Publication Date: 2012-09-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Marine engine crankcase system lubricating oil, also known as marine system oil, needs to be recycled for a long time, and impurities such as organic acids, peroxides, and colloids will be generated in a high-temperature thermal oxidation environment, which will increase its viscosity and corrode non-fe

Method used

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  • Lubricant composition for crosshead ship engine crankcase system
  • Lubricant composition for crosshead ship engine crankcase system
  • Lubricant composition for crosshead ship engine crankcase system

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1-4

[0057] Add antioxidants T534, 1035, and methylidene 4426-S into the mixing container in proportion, heat at 60°C-90°C under normal pressure, and stir for 1 hour-2 hours to obtain a uniform transparent light yellow viscous liquid. Invented component A composite antioxidant. The composition ratio (mass fraction) of composite antioxidant preparation examples 1-4 is shown in Table 1.

[0058] Table 1

[0059] serial number

Embodiment 1-5

[0060] Embodiment 1-5 and comparative example 1-4

[0061] Embodiments 1-5 are the composition and main properties of the lubricating oil for the crankcase system of the crosshead marine engine of the present invention. Add each component into the blending container in proportion, heat at 45°C-80°C under normal pressure, stir for 1 hour-2 hours, and prepare the crosshead marine engine with the viscosity grade of SAE 40 and the total base number TBN of the present invention of 8 Crankcase system lubricating oil composition. Added one-component antioxidants in comparative examples 1-4, respectively T534, 1035, methylene 4426-S and two-component composite antioxidants prepared by the method of patent CN100460490C, wherein examples 1-4 were respectively It has all the same formula composition as the corresponding comparative examples 1-4 except the antioxidant. See Table 2 for the respective composition ratios (mass fractions) of Examples 1-5 and Comparative Examples 1-4.

[00...

Embodiment 6、7

[0071] Embodiment 6,7 and comparative example 5-7

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PUM

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Abstract

The invention relates to a lubricant composition for a crosshead ship engine crankcase system. The lubricant composition comprises A) a composite antioxidant comprising at least components of 1, an alkylated diphenylamine antioxidant, 2, a thiophenolic ester antioxidant and 3, an unessential phenolic thioether antioxidant, B) polyisobutylene succinimide, C) a mixture of magnesium sulfonate and calcium sulfonate, D) at least one zinc dialkyl dithiophosphate, E) one or more dialkyl dithiocarbamates, F) one or more metal deactivators, and G) a main amount of lubricating base oil. The lubricant composition adopts optimized combination of the multiple ashless antioxidants, is blended with the appropriate clearing agent and the dispersant, has a synergistic effect of the additives, can satisfy high-temperature antioxidation requirements of lubricating oil for a crosshead ship engine crankcase system, and has excellent piston cleanliness, high/low-temperature wear resistance and a good viscosity increasing control capacity.

Description

technical field [0001] The invention relates to a lubricating oil composition, in particular to a lubricating oil composition used in a crankcase system of a crosshead marine engine. Background technique [0002] Crosshead marine engines use diesel fuel with a sulfur content as high as 1% to 3%, which produces a large amount of acidic substances. Therefore, crosshead marine engine crankcase system lubricating oils are required to have good oxidation stability and detergency. Marine engine crankcase system lubricating oil, also known as marine system oil, needs to be recycled for a long time, and impurities such as organic acids, peroxides, and colloids will be generated in a high-temperature thermal oxidation environment, which will increase its viscosity and corrode non-ferrous metals. It is beneficial to the cleaning and lubrication of the piston and the engine, and shortens the service life of the lubricating oil. Therefore, the lubricating oil for the crankcase system of...

Claims

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Application Information

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IPC IPC(8): C10M161/00C10N40/25C10N30/06C10N30/10
Inventor 谢欣张辉武志强李新华王立华段庆华周红英杨永璧
Owner CHINA PETROLEUM & CHEM CORP
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