Preparation method of lubricating oil viscosity-temperature improver

Abstract

The invention relates to a preparation method of a lubricating oil viscosity-temperature improver, belonging to the lubricating oil field. The preparation method of the invention comprises the following steps: adding a solvent, i.e. hexane to a polymerization vessel at the temperature of 10-50 DEG C; continuously introducing ethylene, propylene, styrene and hydrogen to the vessel at a mol ratio of 0.1-0.3:0.45-1:1:0.8-1; stirring to react for 1-3h, and then adding a main catalyst, i.e. benzoyl peroxide and an assistant catalyst, i.e. aluminum triethyl, wherein the addition amount of the main catalyst is 0.01-1wt% of that of the solvent, and the addition amount of the assistant catalyst is 2-10 times that of the main catalyst; after reaction is completed, stopping stirring, and then adding methanol to terminate; and finally washing with alkali solution, and then drying in vacuum to obtain the product, i.e. a copolymer of ethylene, propylene and styrene. The preparation method can change the overall indicators of lubricating oil such as viscosity-temperature property, thickening capability, low-temperature performance, dispersibility and the like, thus the lubricating oil is obviously superior to the current similar products.

Description

technical field [0001] The invention belongs to the field of lubricating oil, in particular to a preparation method of a lubricating oil viscosity-temperature improver. Background technique [0002] Viscosity temperature improver is one of the indispensable additives of multi-grade engine oil, and its proportion is second only to detergent and dispersant. Statistics in the United States show that the amount of viscosity index improver is increasing at a rate of 12% per year. The essence of the viscosity-temperature improver is to improve the viscosity-temperature performance of the oil, so that the oil has a higher viscosity index, so as to ensure that the engine can start smoothly at low temperature, and the oil has sufficient viscosity at high temperature to ensure good lubrication . At the same time, it is required that the viscosity-temperature improver does not have obvious harmful effects on the oxidation stability and detergency of the oil, and the multi-grade engine...

AI Technical Summary

Problems solved by technology

If the dry dosage is increased and the temperature is increased, the process cannot be controlled, so the product quality is unstable and the dispersion in use is poor. This is a major disadvantage of the thermal oxidation preparation method