The goal of this project is to develop a continuous process for production of reclaimed waste tire rubber using a co-rotating twin screw extruder and evaluate the possibility of recycling waste tire rubber. The project have already reached the following goal：(1). Completed the continuous devulcanization process stability of waste tire rubber, the sol component content is about 18.3-29.9%；decrosslinking degree is about 72 %；mooney viscosity ML (1+4)100°C is about 39.3~48.0, and the ash, carbon black and crosslink density of reclaimed waste tire rubber quality is evaluated with a ASTM standards. (2). Completed the physical properties of continuous devulcanization of the reclaimed rubber re-cured, that the density (Mg/m3) is about 1.15, tensile strength is about 9.2-9.6 MPa, and elongation at break is about 314-326 % which attain to comply with a CNS 2230 requirements. (3). Completed the continuous devulcanization of the reclaimed waste tyre rubber were formulated with virgin rubber (10/90, 20/80, 30/70, 40/60, 50/50 wt% ratio) and re-cured. The checkpoints of the cured blends were exhibited by the accredited standard methods, the hardness (Shore A) is 60~62, tensile strength is 14.7~17.8 MPa, and tear strength is 23.2~32.9 KN/m which attain to the project objective.

Waste tire, Extruder, Reclaimed rubber