Lubricating oil having good oxidation resistance and specially used for dual-fuel engines

Abstract

The invention relates to a lubricating oil having good oxidation resistance and specially used for dual-fuel engines. The lubricating oil comprises, by mass, 50-63 parts of base oil, 1.5-3.8 parts of nonylphenol polyoxyethylene ether, 1-7 parts of polyvinyl ether, 11-18 parts of poly-alpha-olefin, 10-20 parts of overbased synthetic calcium sulfonate, 1-3 parts of calcium alkylbenzene sulfonate, 1-3 parts of zinc butyl octyl dithiophosphate, 2-5 parts of salicylate, 4-8 parts of trilinolein, 1-5 parts of trimethyl decane, 3-8 parts of sulfurized calcium alkyl phenolate, 1-6 parts of calcium alkylbenzene sulfonate, 5-9 parts of acetophenone, 10-16 parts of glycerol, 6-10 parts of disodium ethylene diamine tetraacetate, 4-6 parts of modified polysiloxane, 0.7-2.5 parts of a composite antioxidant, and 1-3 parts of a metal deactivator. The lubricating oil has excellent oxidation and abrasion resistance.

Description

technical field [0001] The invention relates to a lubricating oil, in particular to a special lubricating oil for a dual-fuel engine with good oxidation resistance. Background technique [0002] 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-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 If the NOx content is too high, the internal combustion engine oil can easily oxidize or nitrate 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 , it is required that the ash content of the internal combustion engine oil should be moderate, so that the ash deposited on the valve ...

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Problems solved by technology

[0002] 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-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 If the NOx content is too high, the internal combustion engine oil can easily oxidize or nitrate 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 , it is required that the ash content of the internal combustion engine oil should be moderate, so that the ash deposited on the valve and the valve seat can act as a lubricant. If the ash content is too low, it will not have the lubrication effect, which will easily lead to wear of the intake valve, exhaust valve and valve seat. If the ash content is too high , will cause early ignition of the engine and spark plug pollution, affect engine power, generate hard deposits on the surface of the engine, excessive carbon deposits, and valve melting

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