The vanadium catalytic system for ethylene-propylene rubber is widely used in domestic and international ethylene-propylene rubber production enterprises due to its advantages such as uniform product sequence distribution,low crystallinity,and narrow composition distribution.However,this catalytic system faces issues such as poor thermal stability,short active center lifespan,and rapid catalyst deactivation,greatly reducing catalytic efficiency and increasing production costs.To achieve cost reduction and efficiency improvement,the use of activators to reactivate deactivated vanadium catalytic systems is the main method for improving the activity of ethylene-propylene rubber vanadium catalytic systems in industrial applications.This article provides an overview of the activators research progress based on the Ziegler-Natta vanadium catalytic systems of ethylene-propylene copolymerization.The article demonstrated the activator effect on the reactivity of ethylene-propylene copolymerization and the properties of the as-synthesized ethylene-propylene rubber.It also summarized the possible activation mechanism of the activators in vanadium-based catalytic systems.
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