Desulfurization of sulfurized rubber

A technology for vulcanizing rubber and rubber, which is applied in the field of desulfurization of vulcanized rubber, and can solve problems such as large-scale implementation of desulfurization technology

Inactive Publication Date: 2004-08-04
THE GOODYEAR TIRE & RUBBER CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, so far no desulfurization technology has been proven to be practical on an industrial scale

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 19-22

[0047] In this series of experiments, a one liter reactor capable of holding 150 grams of vulcanizate for devulcanization was used in all experiments. These desulfurization experiments were carried out in static or dynamic mode (both modes were carried out with or without agitation), using 2-butanol alone or a mixture of 2-butanol and carbon dioxide under supercritical conditions as the desulfurization reagent.

[0048] Compounding evaluations show that 20 phr (parts by weight per 100 parts by weight rubber) of rubber devulcanized by the present technique can be added to a standard tread compound with minimal effect on cure, modulus or elongation. In most cases, tensile strength is slightly reduced, but this can be compensated by increasing the level of vulcanizing agents in the tread compound formulation. Experiments performed in static mode showed a temperature dependence, with larger changes at higher temperatures. The dynamic mode experiments were performed only at 260°C,...

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Abstract

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 DEG C. under a pressure of at least about 3.4x10<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 recured 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 recured 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 DEG C. to about 300 DEG C. under a pressure of at least about 3.4x10<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.

Description

[0001] This application claims the benefit of US Provisional Patent Application Serial No. 60 / 437,790, filed January 3,2003. Background technique [0002] Countless old tires, tubes, belts and other rubber products are thrown away each year after having been worn out during their limited useful life. These old rubber products are often discarded and shipped to landfills because they have little use after having fulfilled their original intended purpose. A limited number of used tires are used to make retaining walls for the protection of ships, and other similar applications. However, the number of worn tires that need to be thrown away each year far exceeds their need for such applications. [0003] Recycling of vulcanized rubber products has proven to be very difficult. This problem associated with recycling vulcanized rubber products arises from the crosslinking of rubber and sulfur during the vulcanization process. After vulcanization, the cross-linked rubber becomes th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J11/16C08J11/24
CPCC08J2321/00C08J11/24C08J11/16C08J2319/00Y02W30/62
Inventor D·A·本科R·N·贝尔斯S·李K·L·克拉克
Owner THE GOODYEAR TIRE & RUBBER CO
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