Method for controlling mooney viscosity of peroxide-curable fluororubber

Abstract

The present invention provides a method for controlling Mooney viscosity of peroxide-cured fluororubber. The method comprises: adding an initiator solution in a continuous supplementary manner during the emulsion polymerization process of a peroxide-cured fluororubber until 5 to 10 minutes before the end of the polymerization reaction; wherein the amount of the initiator solution added initially is 0.1% to 0.5% of the total amount of the polymerization monomer dry materials, and the amount of the initiator solution continuously supplemented is 0.1% to 2% of the total amount of the polymerization monomer dry materials, based on the initiator. The present invention effectively controls the Mooney viscosity value of the peroxide-cured fluororubber within the desired range with small fluctuations by controlling the amount and the manner of addition of the initiator, thereby obtaining a peroxide-cured fluororubber with stable and controllable quality. Moreover, the present invention does not need to add a chain transfer agent, which reduces the amount of additives in the polymerization process, and meanwhile improves the reaction activity of the polymerization system, effectively shortens the time for polymerization, and is beneficial to industrialized production.

Dependencies are inferred from the claim text.