Best Practice for De-Vulcanization of Waste Passenger Car Tire Rubber Granulate Using 2-2-dibenzamidodiphenyldisulfide as De-Vulcanization Agent in a Twin-Screw Extruder.

De-vulcanization of rubber has been shown to be a viable process to reuse this valuable material. The purpose of the de-vulcanization is to release the crosslinked nature of the highly elastic tire rubber granulate. For present day passenger car tires containing the synthetic rubbers Styrene-Butadiene Rubber (SBR) and Butadiene Rubber (BR) and a high amount of silica as reinforcing filler, producing high quality devulcanizate is a major challenge.