Method for passivating end group of fluoroelastomer

Abstract

Provided in the present application is a method for passivating an end group of a fluoroelastomer, which method is applied to the technical field of fluoroelastomers. The method comprises: S1, subjecting a fluoroelastomer to a devolatilization treatment by using a liquid or a supercritical fluid; S2, subjecting the devolatilized fluoroelastomer to a passivation treatment, and removing a passivation medium; and S3, washing the fluoroelastomer with deionized water, dehydrating the fluoroelastomer, and then drying same to obtain a devolatilized and passivated fluoroelastomer. By passivating the fluoroelastomer after liquid or supercritical fluid devolatilization, the obtained fluoroelastomer has less volatile components; by controlling the concentration of the passivation medium and the passivation time so as to control and adjust the end group passivation degree or the end group stabilization degree, the passivated fluoroelastomer has good processability and storage stability, and does not change color when in contact with a high-temperature and oxidation environment.

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