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Lubricant composition for intermediate-speed trunk piston-type engine of ship

A technology of lubricating oil composition and cylindrical piston, applied in the directions of lubricating composition, petroleum industry, additives, etc., can solve problems such as unfavorable piston and engine cleaning, lubrication, increase in viscosity of lubricating oil, shortening service life of oil products, etc. To achieve excellent antioxidant properties, good high temperature cleaning effect

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 medium-speed cylindrical piston engine lubricating oil is used for long-term circulation, and it is in a high-temperature thermal oxidation environment, which is easy to generate organic acids, peroxides and colloids, etc. These products will increase the viscosity of the lubricating oil and corrode non-ferrous metals, which is not conducive to the piston Cleaning and lubricating the engine and shortening the service life of the oil, so the lubricating oil is required to have excellent anti-oxidation performance, clean and dispersive performance, anti-corrosion performance and anti-emulsification and water-separation performance

Method used

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  • Lubricant composition for intermediate-speed trunk piston-type engine of ship
  • Lubricant composition for intermediate-speed trunk piston-type engine of ship
  • Lubricant composition for intermediate-speed trunk piston-type engine of ship

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1-4

[0061] 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.

[0062] Table 1

[0063] serial number

Embodiment 1

[0065] Examples 1-5 are the composition and main properties of the medium-speed trunk piston engine lubricating oil composition of the present invention. Put each component into a mixing container in proportion, heat at 45°C-80°C under normal pressure, and stir for 1 hour-2 hours to prepare the medium-speed tubular piston engine lubricating oil composition with a viscosity grade of SAE 30 of the present invention . In comparative examples 1, 2, and 3-1, single-component antioxidants were added, namely T534, 1035, and methylene 4426-S, and in comparative example 3-2, a double-component antioxidant prepared by the method of patent CN100460490C was added. Divide compound antioxidant, wherein embodiment 1 and comparative example 1, embodiment 2 and comparative example 2 have all identical formulas except antioxidant respectively, and embodiment 3 and comparative example 3-1, 3-2 also have All the same formula composition except antioxidant. See Table 2 for the composition ratios...

Embodiment 6、7

[0075] Embodiment 6,7 and comparative example 4-6

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Abstract

The invention relates to a lubricant composition for an intermediate-speed trunk piston-type engine of a ship. The lubricant composition comprises A) a composite antioxidant composing at least components of 1, an alkylated diphenylamine antioxidant, 2, a thiophenolic ester antioxidant and 3, an unessential phenolic thioether antioxidant, B) a polyisobutylene succinimide ashless dispersant, C) a mixture of magnesium sulfate and sulfurized calcium alkyl phenate, D) at least one zinc dialkyldithiophosphate, E) dialkyldithiocarbamate, F) one or more metal deactivators, G) one or more ashless friction modifiers, and H) a main amount of lubricating base oil. The lubricant composition utilizes optimized combination of the multiple ashless antioxidants, is compounded 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 an intermediate-speed trunk piston-type engine of a ship, 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 an engine lubricating oil composition, in particular to a lubricating oil composition for a medium-speed tubular piston engine used in ships. Background technique [0002] Marine medium-speed diesel engine, also known as trunk piston diesel engine, is characterized by the use of residual diesel fuel with a sulfur content of 2.5%-3.5%, and some can be as high as 5%. The marine medium-speed engine lubricating oil is under the working condition of high thermal load and easy oxidation and deterioration, which puts forward high requirements on the antioxidant used in the marine medium-speed engine lubricating oil. It has been the goal of those skilled in the art to seek more effective antioxidant additives and to develop lubricating oil compositions for medium-speed trunk piston engines used in ships. [0003] The lubricating oil for marine medium-speed trunk piston engines needs to have good acid neutralization ability and have du...

Claims

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Application Information

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