CROSS-LINKED RUBBER RECOVERY AND DEVULCANIZATION METHOD Russian patent published in 2024 - IPC B29B17/02 B29B17/04 B29B7/74 B29C48/00 B29C48/07 B29C48/305 B29C48/385 B29C48/69 

FIELD: chemistry.

SUBSTANCE: invention relates to rubber devulcanization methods. Disclosed is a method of reducing and devulcanizing vulcanised rubber (10) in a plant comprising: mill (12) for grinding vulcanised rubber into particles; twin-screw extruder (20), which is equipped with device (18) for forced supply of vulcanised rubber particles and a temperature control device; single-screw extruder (22) located downstream of twin-screw extruder (20) and equipped with a temperature control device, filter (26) for devulcanized rubber and extrusion head (28), having the shape of a slot, from which devulcanized rubber comes out in the form of a tape or a sheet; and devulcanized rubber strip or sheet cooling device. Twin-screw extruder (20) operates at temperature from 35 to 450 °C, screw rotation speed from 15 to 600 rpm and torque density from 11 to 18 N⋅m/cm³, so that shear rate remains almost constant throughout twin-screw extruder (20).

EFFECT: disclosed method enables to reduce power consumption and obtain end material without impurities and contaminants.

10 cl, 6 dwg