Lubricating oil of dual-fuel engine and preparation method of lubricating oil

Abstract

A lubricating oil of a dual-fuel engine comprises the following raw materials by weight percentage: 50-62.5% of hydrogenated base oil, 15-20% of poly-alpha-alkene, 15-20% of high alkali synthesis calcium sulfonate, 2-3% of zinc butyl octyl dithiophosphate, 1-5% of ethylene-propylene copolymer, 1.5-2% of oxymolybdenum dialkydithiophosphate and 0.0001-0.0002% of methylsilicone grease. The preparation method of the lubricating oil comprises the steps of mixing and heating the hydrogenated base oil, poly-alpha-alkene and high alkali synthesis calcium sulfonate, stirring uniformly, adding zinc butyl octyl dithiophosphate and oxymolybdenum dialkydithiophosphate, stirring uniformly, adding the ethylene-propylene copolymer and methylsilicone grease respectively, stirring uniformly, blending, filtering and obtaining the lubricating oil of the dual-fuel engine. The method is simple in technology and low in production cost; the ash content of the lubricating oil is moderate; the lubricating oil has excellent oxidation resistance, high alkali acidification resistance and wearing resistance; the oil change period of the lubricating oil is prolonged; and the power of the engine is increased.

Description

technical field [0001] The invention relates to a dual-fuel engine lubricating oil and a preparation method thereof. Background technique [0002] With the gradual enhancement of people's awareness of energy conservation, countries all over the world pay more attention to the issue of resource utilization. At present, in the automobile industry, alternative fuel vehicles are being continuously developed, among which the ideal is a dual-fuel vehicle that replaces internal combustion engine oil with fuel such as compressed natural gas or liquefied petroleum gas. [0003] The dual-fuel engine uses natural gas or liquefied petroleum gas as fuel, which has a high calorific value, and the exhaust temperature is as high as 480 ° C, which is 180 ° C to 200 ° C higher than the temperature of ordinary internal combustion engine oil. The high combustion temperature of the engine leads to the evaporation loss of lubricating oil big, NO x If the content is too high, the internal combus...

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Problems solved by technology

[0003]The dual-fuel engine uses natural gas or liquefied petroleum gas as fuel, which has a high calorific value, and the exhaust temperature is as high as 480°C, which is 180% higher than that of ordinary internal combustion engine oil ℃~200℃, the combustion temperature of the engine is high, resulting in a large evaporation loss of the lubricating oil, and the NOx content is too high, and the internal combustion engine oil easily oxidizes or nitrates NOx , increase sludge and carbon deposits, thereby accelerating engine wear and lubricating oil deterioration and aging; moreover, compressed natural gas or liquefied petroleum gas itself has no lubricating effect, so the ash content of internal combustion engine oil is required to be moderate, so that the ash content deposited on the valve and valve seat If the ash content is too low, it will not have the lubricating effect, and it will easily cause the intake valve, exhaust valve and valve seat to wear. If the ash content is too high, it will cause early ignition of the engine and spark plug pollution, which will affect the engine power and form a hard surface on the engine surface. Deposits, excessive carbon deposits, valve melting

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