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
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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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