Disclosed is a regenerated rubber, a method and an apparatus for obtaining regenerated rubbers from vulcanized crumb rubber, such as rubber from scrap. The apparatus is a thermokinetic mixer having the particularity to have an air tight stationary chamber with inner non-uniform surface. The method c
Disclosed is a regenerated rubber, a method and an apparatus for obtaining regenerated rubbers from vulcanized crumb rubber, such as rubber from scrap. The apparatus is a thermokinetic mixer having the particularity to have an air tight stationary chamber with inner non-uniform surface. The method comprises the steps of raising the speed of the rotor shaft in order to increase a temperature of a mixture made of vulcanized crumb rubber and a lubricant, such as oil, until a devulcanizing temperature is reached; and reducing the temperature of the mixture to a lower temperature during a second period of time. The method of the invention is environmentally friendly or “green” since the regeneration method does not use chemicals, includes a shorter period of treatment at higher temperature avoiding the risks of rubber cracking and spontaneous combustion, and further allowing mass-production of regenerated rubber with lower energy consumption.
대표청구항▼
1. A thermokinetic mixer for the regeneration of vulcanized crumb rubber, said thermokinetic mixer comprising: an air tight stationary chamber having an inlet for receiving a crumb rubber mixture, said stationary chamber having sidewalls provided with a cooling jacket, the sidewalls having an inner
1. A thermokinetic mixer for the regeneration of vulcanized crumb rubber, said thermokinetic mixer comprising: an air tight stationary chamber having an inlet for receiving a crumb rubber mixture, said stationary chamber having sidewalls provided with a cooling jacket, the sidewalls having an inner non-uniform surface; the stationary chamber being also provided with a cooling injection system for injection of a cooling agent within the stationary chamber, the cooling agent comprising water; the stationary chamber having an outlet for exiting regenerated crumb rubber; anda rotor shaft co-axially extending into the stationary chamber, said rotor shaft having blades extending from the shaft into the chamber and a controlled speed varying up to at least about 1800 rpm. 2. The thermokinetic mixer of claim 1, wherein the blades have an outer non-uniform surface. 3. The thermokinetic mixer of claim 2, wherein the non-uniform surface is at least one of a textured surface and a beaded non-smooth surface. 4. The thermokinetic mixer of claim 3, wherein said non-uniform surface is lined with hardened steel in the form of a welded bead or machined in the same form as the welded bead. 5. The thermokinetic mixer of claim 2, wherein at least one of the blades is rotated or longitudinally twisted. 6. The thermokinetic mixer of claim 2, wherein said blades are in a non-parallel relationship one to another. 7. The thermokinetic mixer of claim 1, wherein the injection device comprises a nozzle device to inject the cooling agent into the stationary chamber in a form of a mist or a jet stream. 8. The thermokinetic mixer of claim 1, wherein the injection device comprises several injection nozzles extending in the sidewalls of the stationary chamber. 9. The thermokinetic mixer of claim 1, further comprising a vacuum pump in connection with the stationary chamber for removing air and vapour out of the chamber. 10. The thermokinetic mixer of claim 1, further comprising a pre-mixer for mixing vulcanized crumb rubber and a lubricant at room temperature to form the crumb rubber mixture for feeding into the stationary chamber. 11. The thermokinetic mixer of claim 10, further comprising a transfer device for transferring the mixture from the pre-mixer into the stationary chamber. 12. The thermokinetic mixer of claim 11, wherein the transfer device is an air tight transfer device. 13. The thermokinetic mixer of claim 12, wherein the transfer device comprises a loading and isolating compartment. 14. The thermokinetic mixer of claim 13, wherein the transfer device comprises a worm drive or screw drive located around the shaft near the inlet of the stationary chamber. 15. The thermokinetic mixer of claim 11, further comprising a cooling device, downstream of the outlet, to cool down the regenerated crumb rubber. 16. The thermokinetic mixer of claim 15, wherein the cooling device is a drum tumbler. 17. The thermokinetic mixer of claim 9, wherein the cooling agent is water which, when the thermokinetic mixer is in operation, vaporizes, carrying out sulphur derivatives from the partial devulcanization of the rubber, the vacuum pump evacuating at least some of the vaporized water and sulphur derivatives from the stationary chamber. 18. A thermokinetic mixer for the regeneration of vulcanized crumb rubber, said thermokinetic mixer comprising: an air tight stationary chamber having an inlet for receiving a crumb rubber mixture, said stationary chamber having sidewalls provided with a cooling jacket, the sidewalls having an inner non-uniform surface; the stationary chamber being also provided with a cooling injection system for injection of a cooling agent within the stationary chamber, the cooling agent comprising water; the stationary chamber having an outlet for exiting regenerated crumb rubber; anda rotor shaft co-axially extending into the stationary chamber, said rotor shaft having blades extending from the shaft into the chamber, the blades having an outer non-uniform surface, and a variable electric speed controller for controlling a speed of the shaft up to at least about 1800 rpm. 19. A thermokinetic mixer for the regeneration of vulcanized crumb rubber, said thermokinetic mixer comprising: an air tight stationary chamber having an inlet for receiving a crumb rubber mixture, said stationary chamber having sidewalls provided with a cooling jacket, the sidewalls having an inner non-uniform surface; the stationary chamber being also provided with a cooling injection system for injection of a cooling agent within the stationary chamber, the cooling agent comprising water; the stationary chamber having an outlet for exiting regenerated crumb rubber;a vacuum pump connected to the stationary chamber for removing air and vapour out of the stationary chamber; anda rotor shaft co-axially extending into the stationary chamber, said rotor shaft having blades extending from the shaft into the stationary chamber, the blades having an outer non-uniform surface, and a controllable speed varying up to at least about 1800 rpm.
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