Desulfurization Mechanism Of Tyre Rubber Under Ultra-high Water Jet Impact

The recycle of waste radial tyre has been an attention-getting subject in recent years, ithas a direct influence on environment, resource security and the sustainable developmentof economic, many subjects and technologies are involved in this process. The powder ofwaste tyre rubber has been an important means to process the waste radial tyre and reclaimrubber resource, the rubber powder can be directly used or be desulfurized for furtherapplications. The usability of rubber powder is influenced by its grain size, and the rubbermaterial can be desulfurized directly in the powder process if its grain size is small enough.In this paper, ultra-high water jet was applied to recycle the waste radial tyre, the groundtread rubber (GTR) was powdered into partials using ultra-high water jet to reclaim therubber resource from waste radial tyre.The particle size distribution of the rubber powder reclaimed by water jet was obtainedthrough particle size analysis, the stress distribution of rubber material interior and itspropagation law under the impact of water jet was simulated, the microstructure of rubberfailure surfaces and rubber particles were observed by scanning electron microscope(SEM), the fracture behavior of the tread rubber was studied. Low field nuclear magneticresonance (NMR) analysis and infrared analysis were performed to study thedesulfuration process of the material.It turned out that the tread rubber presented a brittle state because of the rate-temperature equivalence effect caused by the high load speed of water jet, the mainmicroscopic failure modes were intergranular damage and transgranular fracture due totensile and shearing stress. It’s confirmed that the rubber partial was desulfurized duringthe fracturing process, the chemical mechanism and chemechanics mechanism caused bywater jet were also researched.