Lubricant composition for gas engine

A technology for lubricating oil composition and gas engine, applied in the directions of lubricating composition, petroleum industry, additives, etc., can solve the problems of reducing catalyst efficiency, early engine wear and overhaul mileage, and high exhaust gas emission temperature, and achieves excellent anti-oxidation performance, 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

However, the original gasoline engine lubricating oil for this type of vehicle has problems such as high carbon deposits, large sludge, and shortened oil change intervals, and the engine is prone to many problems such as early wear and short overhaul mileage.
In terms of performance, ordinary gasoline engine lubricating oil does not meet the requirements for lubricating oil of CNG/gasoline dual-purpose fuel engines. Compressed natural gas/gasoline dual-purpose fuel engines use natural gas when the combustion chamber temperature is high and the exhaust temperature is high, so Ordinary gasoline engine lubricating oil is difficult to meet the anti-oxidation performance requirements of the engine at high temperature, and its high-ash addi

Method used

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  • Lubricant composition for gas engine
  • Lubricant composition for gas engine
  • Lubricant composition for gas engine

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1-5

[0060] 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. See Table 1 for the composition ratio (mass fraction) of the composite antioxidant preparation examples 1-5.

[0061] Table 1

[0062] serial number

Embodiment 1

[0064] Embodiments 1-5 are the composition and main properties of the gas engine lubricating oil of the present invention. Add 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 a low-phosphorus and low-ash gas engine lubricating oil composition with a viscosity grade of 5W-30. 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 (mass fractions) of Examples 1-5 and Comparative Examples...

Embodiment 6-9

[0073] Embodiment 6-9 and comparative example 4

[0074] Examples 6-9 are low-phosphorus and low-ash gas engine lubricating oil compositions with a viscosity grade of 5W-30 according to the present invention. Coke forming tests were carried out on Examples 6-9 and Comparative Example 4 respectively, and the formula composition and test results are shown in Table 5. Wherein embodiment 6, what adding in embodiment 6,7 is the mixture of low alkali value sulfurized alkyl phenate calcium and medium alkali value sulfurized alkyl phenate calcium, what add in embodiment 8,9 is the cleaning agent of single component, comparative example 4 and The difference of embodiment 7 is that N,N-dihexylaminomethylene benzotriazole is not added.

[0075] table 5

[0076]

[0077] The equipment used in the coke plate test is the 25B-19 coke plate tester produced by Japan Meitech Company. This test simulates the working conditions of the engine crankcase and cylinder liner piston ring lubricati...

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Abstract

The invention relates to a lubricant composition for a gas engine. The lubricant composition contains: by mass, less than or equal to 0.08% of phosphorus and less than or equal to 0.8% of sulfate ash. The lubricant composition comprises A) a composite antioxidant comprising at least ingredients of 1, an alkylated diphenylamine antioxidant, 2, a thiophenolic ester antioxidant and 3, an unessential phenolic thioether antioxidant, B) a dispersant, C) one or more sulfurized alkaline earth metal alkyl phenolate cleaning agents, D) at least one zinc dialkyl dithiophosphate, E) one or more ashless friction modifiers, F) one or more metal deactivators and G) a main amount of lubricating base oil. The lubricant composition for a gas engine 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 gas engine, 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 low-phosphorus and low-ash lubricating oil composition for a gas engine. Background technique [0002] The low emission, low fuel cost and reasonable fuel resource allocation characteristics of compressed natural gas make it increasingly valued as a vehicle engine fuel in the world, and promote the development of compressed natural gas vehicles at home and abroad, and its technology development is also becoming more and more mature. Compressed natural gas / gasoline dual-fuel vehicles refitted from gasoline vehicles are widely welcomed in large and medium-sized cities, and their development prospects are very bright. However, the original gasoline engine lubricating oil used in this type of vehicles has problems such as high carbon deposits, large sludge, and shortened oil change intervals. The engine is prone to many problems such as early wear and short overhaul mileage. In ter...

Claims

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Application Information

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IPC IPC(8): C10M161/00C10N40/25C10N30/06C10N30/10
Inventor 谢欣武志强王立华张辉李新华段庆华李华杨永璧
Owner CHINA PETROLEUM & CHEM CORP
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