Lubricating oil viscosity-temperature improver

Abstract

The invention belongs to the field of lubricating oil, and particularly relates to a lubricating oil viscosity-temperature improver. The preparation method disclosed by the invention comprises the following steps of: adding a solvent hexane into a polymerization reaction container, heating to 10-50 DEG C, and continuously introducing ethylene, propylene, styrene and hydrogen, wherein a molar ratioof hydrogen to ethylene to propylene to styrene is (0.1-0.3):(0.45-1):1:(0.8-1); carrying out a stirring reaction for 1-3 hours, and adding a main catalyst benzoyl peroxide and a cocatalyst triethylaluminum, wherein the addition amount of the main catalyst is 0.01-1% (weight) of the addition amount of the solvent, and the amount of the cocatalyst is 2-10 times the weight of the main catalyst; andstopping stirring after the reaction is finished, adding methanol to terminate, washing with an alkaline solution, and carrying out vacuum drying to obtain the product ethylene-propylene-styrene copolymer. According to the invention, with the lubricating oil viscosity-temperature improver, the viscosity-temperature characteristic, the thickening capacity, the low-temperature performance, the dispersity and other comprehensive indexes of lubricating oil can be changed, and are obviously superior to the viscosity-temperature characteristic, the thickening capacity, the low-temperature performance, the dispersity and other comprehensive indexes of the existing similar products.

Description

technical field [0001] The invention belongs to the field of lubricating oil, and particularly relates to a lubricating oil viscosity-temperature improver. Background technique [0002] Viscosity-temperature improver is one of the indispensable additives for multi-grade engine oil, and its proportion is second only to detergent and dispersant. US statistics show that the amount of viscosity index improver is increasing at an annual rate of 12%. The function 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 oil has less viscosity loss ...

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