Abstract
Carbon black stock vulcanizates of the following ten types of synthetic rubbers were reclaimed by the treatment with a softner and the copper (I) chloride-tributylamine system at room temperature for 50 h followed by mastication at room temperature for 5-15min.Sulfur vulcanizates of synthetic isoprene rubber, styrenebutadiene rubber, acrylonitrile-butadiene rubber, ethylene-propylene terpolymer, and butyl rubber; styrenebutadiene rubber vulcanized by tetramethylthiuram disulfide and zinc oxide; chloroprene rubber vulcanized by2-mercaptoimidazoline; and organic peroxide vulcanizates of styrene-butadiene rubber.chloroprene rubber, and ethylenepropylene terpolymer.Vulcanization of these reclaims with sulfur and vulcanization accelerator gave good elastomers.However, processability of the reclamation and tensile properties of the vulcanizates was much influenced by kinds of the softeners used for the reclamation.This seems to be due partly to a difference between polar nature of the softener and the rubber in original vulcanizate.
