Study On Desulfurization Regeneration Of Waste Rubber By Mechanochemicality And Secondary Vulcanization

In this paper, using mechanochemocality method to reclaim waste rubber, first, using a high temperature autoclave to activate waste rubber, get the preliminary reclaimed rubber, and then use the shear stess of mixer to mechanochemocal regeneration for the preliminary reclaimed rubber. Lastly, to further study reclaimed rubber and natural rubber blends.Research on the catalytic role of regeneration activated agent, the swelling roll of Softeners, the enhancement of regeneration time and regeneration temperature for regeneration and secondary regeneration of mechanochemocal regeneration process(Temperature, time, rotor speed). Determination of the effect of activated regeneration process and mechanochemocal regeneration process on tensile strength and mooney viscosity. The results show that regeneration activated agent can effectively destroy reticulate structure under the conditions of heat, and pressure, the swelling effect of softener have significant effects on regeneration.Using infrared spectroscopy(FTIR) and scanning electron microscopy(SEM) to analyze the microstructure of recycled rubber, found that chain structure remains relatively intact, powder particles disappear, plasticity is improved, can not be completely regenerated, unregenerated powder agglomerates together, the mechanical properties of recycled rubber drop. Using TG to analyze thermal stability of GTR and dGTR at high temperatures, weight loss of GTR is higher than dGTR, it showed that reticulate structure is destroyed after regeneration. Using no rotor rheometer to determine the optimum vulcanization time(tc90), to help secondary vulcanization.Using the DMA to analyze the regeneration vulcanized rubber, determine the optimum cure temperature and cure time; by testing the loss factor of dGTR, the regeneration effect is better, tanδ is bigger, thereby to determine the optimum mixing temperature. Using RPA to perform strain sweep, use the right amount of activator to promote regeneration, the crosslinking density decreases and the loss modulus increase,storage modulus decreases, in order to determine the optimum amount of activator.The last, research on dGTR / NR blends, tested the curing properties of different proportions blends, to determine the optimum cure time, test Mooney viscosity and mechanical properties, and determine the best blending ratio, the analyze the blends by SEM and DMA.