Method for the devulcanization of a vulcanized rubber mixture, device for carrying out the method and use of the device for the devulcanization of a vulcanized rubber mixture

US12391821B2 · kind B2 · utility

Assignee

• Continental Reifen Deutschland GmbH · DE

Inventors

• Inga Soetbeer · Celle, DE
• Konstantin Efimov · Hefei, CN
• Nils Krüger · Garbsen, DE
• Shreyas Naik · Hannover, DE
• Thomas Völker · Seelze, DE
• Hilke Wolf · Farster Bauerschaft, DE

Key dates

• Filing date: Oct 27, 2020
• Grant date: Aug 19, 2025
• Expiry date: Aug 10, 2042

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02W30/62
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

The invention relates to a process for devulcanizing a vulcanized rubber mixture, comprising the following steps: A) providing or producing a vulcanized rubber mixture, B) comminuting the vulcanized rubber mixture to a granular material composed of vulcanized rubber particles, where the vulcanized rubber particles have a maximum particle diameter of 100 mm, C) extruding the vulcanized rubber particles produced in step B) in a twin-screw extruder at a shear rate of less than 100 s−1, where the temperature of the vulcanized rubber particles during extrusion is less than 200° C., to give a devulcanized rubber mixture having a temperature above 100° C., D) cooling the devulcanized rubber mixture in a further kneading unit, so as to give a devulcanized rubber mixture having a temperature in the range from 50° C. to 100° C. The invention further relates to an apparatus for performing the process and to the use of the apparatus for devulcanization of a vulcanized rubber mixture.