Study On The Storage Stability And Reinforcing Performance Of Reclaimed Rubber

This paper adopted the thermochemical regeneration process to achieve the reclamation of waste tire rubber powder (WTR). The sol content, crosslinking density, mechanical properties, dynamic mechanical properties and apparent morphology of the reclaimed rubber have been studied. And the influence of storage time on structure and performance of the reclaimed rubber also have been investigated. In the regeneration process, we added different kinds of organic compounds to reinforce the reclaimed rubber, and investigated the influence of organic compounds on structure and performance of reclaimed rubber. Afterwards we made the elastomers of the waste tire rubber powder through molding technologies, and studied the process parameters, the particle size of waste tire rubber powder and the curing system of the powder molding.The study of storage stability of reclaimed rubber shows that Mooney viscosity, crosslinking density, the storage modulus and the rubber hydrocarbon content of reclaimed rubber increased with the increase of the storage time, but the sol content and low molecular volatile gradually decreased. At the same time, the physical and mechanical properties of revulcanization rubber changes little. This might be the small molecules volatilize and the macromolecular free radical have not been sealed in regeneration process and crosslinked again, so Mooney viscosity and storage modulus increased, but it have little impact on the subsequent processing.Ligin, lignin sulfonate, LIR50 and coumarone resin were designed to reinforce reclaimed rubber which achieved with the whole tire rubber powder and investigated their effects on the structure and properties of reclaimed rubber. The results show that LIR50 have better on reinforcing performance of the reclaimed rubber. With the amount of LIR50 increased, Mooney viscosity decreased significantly, tensile strength and elongation at break of revulcanization rubber gradually increased. SEM analysis shows that LIR50 and reclaimed rubber had good compatibility.Silane coupling agent (Si69), coupling agent of organic titanate, CM and HDPE were designed to reinforce reclaimed rubber which achieved with the waste tread rubber powder and investigated their effects on the structure and properties of reclaimed rubber. The results show that CM have better on reinforcing performance of the reclaimed rubber and when added CM is 8phr, the reclaimed rubber have a better comprehensive performance. With the amount of CM increased, Mooney viscosity of reclaimed rubber decreased, crosslinking density, tensile strength and elongation at break of reclaimed rubber gradually increased.This paper also studied the compression molding properties of the waste tire rubber powder. The results shows that the increase of the molding temperature or the molding time can improve the mechanical properties of molding films, while the molding pressure has little influence on the mechanical properties. In summary, the optimum condition of the compression molding for the waste tire rubber powder is 10MPa×170℃×20min. Meanwhile, when the particle size of waste tire rubber powder is 60 mesh and the frozen powder is 120 mesh, the mechanical properties of molding film is better than other size.