Ethylene Propylene Rubber Polymerization Catalyst Deactivation Method

Abstract

The invention provides a polymerization catalyst deactivation method for ethylene propylene rubber. The polymerization catalyst deactivation method comprises the following steps: (1) adding a catalyst containing rubber solution obtained by a polymerization reaction into a reaction flask, carrying out stirring at a constant temperature, gradually dropwise adding a methanol or ethanol solution containing a deactivator, continuing stirring, and carrying out standing; and (2) adding desalted water into the rubber solution obtained after standing in the step (1), continuing stirring at a constant temperature, carrying out standing and stratification until the pH value of a supernatant rubber solution is in a range of 7 to 8, and subjecting the rubber solution to analyzing.

Description

technical field [0001] The invention relates to a method for deactivating an ethylene-propylene rubber polymerization catalyst. Background technique [0002] The industrial production process of solution method EPDM rubber generally uses ethylene, propylene and non-conjugated dienes as raw materials, uses Ziegler-Natta's vanadium or titanium compounds as the catalytic system, and saturated hydrocarbon solution as the solvent. Carrying out continuous polymerization is the basic process. The main disadvantage of this process is that the utilization rate of the catalyst is not high, the catalytic efficiency is low, and the content of catalyst residue in the polymerization product is relatively high. If the catalyst residues (vanadium, ash, chloride) are not removed, first, it will affect the electrical insulation performance of ethylene propylene rubber; second, it will seriously affect the thermal stability and aging resistance of ethylene propylene rubber; Contains chlorine...

AI Technical Summary

Problems solved by technology

The catalyst deactivation process commonly used in domestic ethylene-propylene rubber equipment uses methanol or water as the deactivation reagent. The methanol deactivation process requires high reaction temperature and pressure, and then multi-stage alkaline washing is required to completely remove the catalyst in the glue. , and the water deactivation process has a low removal efficiency of the catalyst in the EPDM rubber glue, and is prone to water washing and emulsification, which eventually leads to a high catalyst residue in the glue, which affects product quality