Development of bus body rubber profiles with additives from renewable sources: Part Ⅱ - Chemical, physical-mechanical and aging characterization of elastomeric compositions

摘要

The aim of this work was to characterize the chemical, physical-mechanical and aging properties of elastomeric compositions containing additives from renewable sources designed to replace the components traditionally used at rubber industry. The elastomeric compositions were processed in a torque rheom-eter with an acceleration system added into a laboratory two-roll mill. The compositions were prepared using varying proportions of a vulcanization activator - MDECR~®, vegetable oil - MD600~® and a loading filler - MDCO~®. The resulting materials were characterized in terms of their cross-link density and physical-mechanical properties, including Shore A hardness, tensile strength and tear strength. The samples were also subjected to accelerated thermo-oxidation aging. The best physical-mechanical performance was achieved with a composition of 4 parts per hundred of rubber (phr) MDECR~® and 10 phr MD600~®, promoting a 75% reduction in the zinc content and a 60% reduction in the oil content. The cross-link density and physical-mechanical properties were not affected by MDCO~®, which was used as a filler to reduce the costs of the material. The cross-link density decreased in materials containing MDECR~® and MD600~®. Satisfactory aging resistance was observed for compositions containing MD600~® and MDCO~®.