Method and composition for devulcanization of waste rubber

C - Chemistry – Metallurgy – 08 – J

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C08J 11/04 (2006.01) B29B 17/04 (2006.01) C08J 11/18 (2006.01)

Patent

CA 2445020

Mechanical/chemical method and composition for devulcanization of rubber maintains the macromolecules, renders sulfur passive for later re- vulcanization, as show in Figure 1, is cost effective, enviromentally friendly and produces high quality de-vulcanized rubber to replace virgin rubber. Waste rubber is shredded, crushed and metal-removed. Modifying composition is added as the particles of shredded waste rubber are poured between two rollers that further crush the particles. The modifying composition is a mixture of a proton donor, an organic acid, an inhibitor a friction agent. The particles are subjected to at least 10 sets of rollers.

Un procédé mécanique-chimique et une composition de dévulcanisation de caoutchouc maintiennent les macromolécules, rendent le soufre passif pour une revulcanisation ultérieure, telle que l'illustre la figure, sont rentables, sans danger pour l'environnement et produisent du caoutchouc dévulcanisé de haute qualité permettant de remplacer le caoutchouc vierge. Les déchets de caoutchouc sont déchiquetés, broyés et démétallisés. Une composition de modification est ajoutée à mesure que les particules de déchets de caoutchouc déchiquetés sont versées entre deux rouleaux lesquels broient à nouveau les particules. La composition de modification est un mélange d'un donneur de protons, d'un acide organique, d'un inhibiteur et d'un agent de frottement. Les particules sont traitées dans au moins dix ensembles de rouleaux.

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