Lubricating oil for marine medium-speed cylindrical piston diesel engine

Abstract

The invention relates to the technical field of lubricating oil, in particular to lubricating oil for a marine medium-speed cylindrical piston diesel engine. The lubricating oil for a marine medium-speed cylindrical piston diesel engine comprises the following raw materials: 80-88% of base oil, 5-9% of a composite metal detergent, 0.2-1% of a low-nitrogen polyisobutylene succinimide dispersant, 0.1-1% of a pour point depressant, 0.5-2% of an antioxidant, 3-5% of an OCP viscosity index improver, 1-5% of a phosphorus-nitrogen anti-wear extreme pressure additive and 1-5% of zinc dialkyl dithiophosphate. According to the present invention, the product is refined from the deeply hydrogenated base oil through the scientific formula and the advanced production process, such that the oxidation resistance and the stability of the oil product are substantially improved, the oil change period of the product can be substantially prolonged, the resource consumption can be effectively reduced, the use cost can be reduced, and the high cost performance is provided.

Description

technical field [0001] The invention relates to the technical field of lubricating oil, in particular to lubricating oil for marine medium-speed cylindrical piston diesel engines. Background technique [0002] A medium-speed cylindrical piston diesel engine, referred to as a medium-speed engine, generally has a speed of 300-1000r / min, a bore of 200-620mm, and an output power of 103-1800 brake horsepower. Because of its compact structure, high specific power per unit volume and weight, and easy operation, it is mainly used for medium and small ship main engines or large ship auxiliary engines. Its cylinders, valve trains, and bearing bushes share one lubricating oil, referred to as medium speed oil. As an excellent marine medium-speed engine oil, it should have good acid neutralization ability, high temperature cleaning and dispersibility, thermal oxidation stability, water separation and anti-wear and anti-corrosion properties. In the past, my country's ocean-going ships us...

AI Technical Summary

Problems solved by technology

[0004] (1) Short service life; most of them use Class I base oils and ZDDP antioxidants, resulting in poor oxidation resistance of the oil and easy oxidation and deterioration, resulting in short service life of the oil. Generally, it needs to be replaced after half a month after refueling Oil

[0005] (2) Serious engine wear; poor cleanliness and dispersibility of oil products, forming a large amount of carbon deposits and coke, resulting in increased particle wear

Resulting in shortened overhaul intervals and increased engine repair and downtime costs

[0007] (4) The consumption of engine oil and fuel oil is large; due to the poor oxidation resistance of oil products, the viscosity of oil products increases rapidly, which increases the power required to maintain the normal circulation of engine oil, which eventually leads to high fuel consumption

At the same time, engine oil consumption increases due to short oil change intervals

[0008] (5) Poor low temperature performance; at present, domestic and foreign medium-speed cylindrical piston diesel engine oils are all single-grade oils, and the lowest temperature for normal use is 10°C

In winter, the temperature in most areas is around 0°C-20°C, and in some areas it can reach -30°C. Therefore, the current marine medium-speed cylindrical piston diesel engine oil is difficult to operate when used in winter (some need to be preheated before adding )

And after a period of docking in winter, it is extremely difficult to restart