Surface devulcanization of cured rubber crumb

Details Surface devulcanization of cured rubber crumb Surface devulcanization of cured rubber crumb

C - Chemistry, Metallurgy

08

J

C08J 11/24 (2006.01) B60C 1/00 (2006.01) C08L 17/00 (2006.01) C08L 21/00 (2006.01)

Patent

CA 2307973

This invention is based upon the unexpected discovery that the surface of reclaimed rubber crumb particles can be devulcanized by heating the crumb particles to a temperature of at least about 150°C under a pressure of at least about 3.4 x 10 6 Pascals in the presence of 2-butanol. It is further based upon the unexpected discovery that such surface devulcanized rubber crumb particles having a particle size within the range of about 325 mesh to about 20 mesh can be recompounded and recurred into high performance rubber products; such as, tires, hoses and power transmission belts. This invention more specifically discloses a process for devulcanizing the surface of reclaimed rubber crumb into surface devulcanized reclaimed rubber crumb that is suitable for being recompounded and recurred into high performance rubber products, said process comprising the steps of (1) heating the reclaimed rubber crumb to a temperature which is within the range of about 150°C to about 300°C under a pressure of at least about 3.4 x 10 6 Pascals in the presence of 2-butanol to devulcanize the surface of the rubber crumb thereby producing a slurry of the surface devulcanized reclaimed rubber crumb in the 2-butanol, wherein the reclaimed rubber crumb has a particle size which is within the range of about 325 mesh to about 20 mesh, and (2) separating the surface devulcanized reclaimed rubber crumb from the 2-butanol.

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