DEVULCANIZATION CONDITION AND MECHANICAL PROPERTIES OF REVULCANIZED RUBBER FOR EPDM

Abstract

Continuous devulcanization by shear flow stage reaction control technology has been developed. In this technology, it is very effective to give high shear strain to vulcanized rubber under high internal pressure. Using adequate screw geometry and alignment based on this concept, devulcanization can proceed continuously. Properties of devulcanized rubber depend on reaction temperature, screw rotation and addition of devulcanizing agent and process oil. Under adequate reaction temperature and screw rotation, devulcanization can proceed without devulcanizing agent and process oil. Revulcanized rubber obtained by this condition shows excellent mechanical properties nearly equal to virgin ones. Furthermore, mechanical properties of revulcanized rubber can be controlled by addition of devulcanizing agent and process oil.