Special oil for 75W-90 viscosity grade vehicle gear, and preparation method thereof

Abstract

The invention provides special oil for a 75W90 vehicle gear, wherein the special oil comprises, by weight, base oil and an additive, the addition amount of the additive is 3.631-13.108% of the addition amount of the base oil, the base oil comprises three components of 25-50% of poly alpha-olefin, 15-25% of alkyl naphthalene and 25-60% of metallocene poly alpha-olefin, and the additive comprises eight components of 0.1-0.5% of an anti-rust agent amide anti-rust agentm 0.3-1.5% of an antioxidant octyl / butyl liquid-state diphenylamine, 0.5-4% of a corrosion inhibitor molybdenum dialkyl dithiosulfate, 0.2-2% of an antiwear agent tricresyl phosphate, 2-4% of an extreme pressure agent sulfurized isobutylene, 0.03-1% of a friction modifier benzotriazole fatty amine salt, 0.1-0.5% of a dispersingagent synthetic calcium sulfonate with a medium base number, and 0.001-0.008% of a composite antifoaming agent. According to the invention, the viscosity index improver is not added, and the high-viscosity poly alpha olefin is used for increasing the viscosity, so that the anti-shearing performance is excellent, the oxidation resistance is greatly improved, the service life of the product is prolonged, and the service life is prolonged and can reach more than 100000 kilometers.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a special oil for vehicle gears with a viscosity level of 75W-90 and a preparation method thereof. Background technique [0002] 75W-90 vehicle gear oil is mainly used for the lubrication of the vehicle drive axle, and the vehicle drive axle is a key component in the power transmission of the vehicle. Most of the current vehicle gear oils use viscosity index improvers to adjust the viscosity, so the viscosity during use The decrease of the viscosity is very obvious, and the decrease of the viscosity reduces the applicability of the oil. At present, vehicle manufacturers and drive axle OEMs have put forward higher requirements on the shear performance of oil products. At the same time, the State Administration for Market Regulation issued in July 2018 and implemented a new The automotive gear oil standard GB13895-2018 adds KRL shear stability (20h) requireme...

AI Technical Summary

Problems solved by technology

[0002] 75W-90 vehicle gear oil is mainly used for the lubrication of the vehicle drive axle, and the vehicle drive axle is a key component in the power transmission of the vehicle. Most of the current vehicle gear oils use viscosity index improvers to adjust the viscosity, so the viscosity during use The decrease of the viscosity is very obvious, and the decrease of the viscosity reduces the applicability of the oil

The patent application with the publication number CN107868691 discloses a 75W-90 viscosity grade heavy-duty gear oil composition and its application. Although the problem of shear stability is also mentioned, it uses a random mixture of ethylene and α-olefins. Copolymer viscosity index improver, due to the relatively large molecular weight of the copolymer, the viscosity will inevitably decrease during use

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