Special lubrication oil for heavy-load LNG (liquefied natural gas) engine

Abstract

The invention discloses special lubrication oil for a heavy-load LNG (liquefied natural gas) engine. The lubrication oil comprises base oil, a viscosity index improver, polymethacrylate, overbased compound magnesium sulfonate, borated polyisobutene succinimide, p,p'-octyldiphenylamine, a liquid hindered phenol type antioxidant, oxymolybdenum dialkydithiophosphate, thiophosphate complex ester, methyl silicone oil and thiadiazole polysulfide, wherein the viscosity index improver is prepared by mixing any of ethylene-propylene copolymers T604, T613, T614, T615 and T618 with a random copolymer of ethylene and alpha-olefin in the mass ratio of 1: 1-8:1. The lubrication oil has an excellent high-temperature detergent dispersing property, excellent high-temperature viscosity remaining capacity, acid neutralization capacity and attenuation resistance, the coking amount is small, the oil-change mileage of the engine is greatly increased, meanwhile, the low-temperature fluidity is good, the engine can work at a lower temperature, and the use requirement of the low-temperature heavy-load LNG engine can be met.

Description

technical field [0001] The invention relates to a special lubricating oil for a heavy-duty liquefied natural gas engine. Background technique [0002] Liquefied natural gas (LNG) fuel is mainly used in heavy-duty vehicles, mainly dump trucks and heavy-duty trucks. The supporting LNG gas stations are only set up around their work sites. Most of them are field mines with large temperature differences between day and night. LNG vehicles Basically, it works at full load, and the engine is not easy to start when the temperature is low at night, and the resistance increases during operation, causing wear and tear. This requires LNG vehicle engine oil to have good viscosity-temperature performance, that is, good low-temperature fluidity and high-temperature viscosity. At the same time, the engine fueled by LNG is used continuously at 70% to 100% load, while the engine used by vehicles fueled by gasoline and diesel is only at full load for 50% of the time. However, LNG has a higher...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide an engine oil with excellent lubricity, good low-temperature fluidity and high-temperature Special lubricating oil for heavy-duty LNG engines with good viscosity retention

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