| Summary: | The ultrasonic desulfurization of 40 mesh waste ground tire rubber (GTR) was carried out in an ultrasonic co-rotating twin-screw extruder. The effects of screw structure on the die pressure and power consumption during ultrasonic desulfurization process, the external morphology, rheological properties and curing characteristics of desulfurized GTR (DGTR), and the mechanical properties of the vulcanized DGTR were studied. The results showed that the mass fraction of gel , viscosity and storage modulus of the DGTR prepared using the screw with kneading blocks under 13 μm ultrasonic amplitude were the lowest, indicating that the shearing effect of the screw with kneading blocks was much stronger, which could make GTR a higher degree of desulfu-rization. The tensile strength and 100% modulus of the vulcanized DGTR prepared using the screw with kneading blocks under 13 μm ultrasonic amplitude were the lowest, while the elongation at break was the highest.
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