Three-epm seal ring double mother rubber blending and mixing method

Abstract

The application provides a double-mother-gum blending and mixing method for a three-element ethylene-propylene sealing ring. The method comprises the following steps: dividing three-element ethylene-propylene raw rubber of the same batch into a first rubber material and a second rubber material; pre-mixing white carbon black, a silane coupling agent and part of a processing aid to form a first pre-treatment filler, and mixing the first pre-treatment filler with the first rubber material to form a first mother gum; mixing the second rubber material with a mineral filler component to form a second mother gum, and the first mother gum has a higher gum discharging temperature than the second mother gum; respectively discharging and standing, then re-discharging the second mother gum to form a base rubber sheet, cutting the first mother gum into strips and dispersively laying the strips along the width direction of the base rubber sheet, performing wrapping, folding back and repeatedly opening and mixing to form a combined gum; and adding a peroxide vulcanizing agent and an aid cross-linking agent below a preset final mixing temperature to perform final mixing, so as to obtain a sealing ring rubber material. The application is beneficial to improving the uniformity of double-mother-gum blending and the stability of subsequent final mixing.

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