Improving the Properties of the Tire Tread by Adding SiO_2 and Al_2O_3 to SBR Rubber

摘要

Particulate reinforced elastomer composite was prepared by adding reinforcing fillers Al_2O_3 and SiO_2 separately to the styrene butadiene rubber (SBR), at different loading levels (0, 5, 10, 15, 20 and 25 pphr). Also many specific tests are performed on these composites. The effects of fillers type and their loading level on the mechanical and physical properties were studied. The results showed that the mechanical properties except resilience increased with the addition of both types of reinforcing fillers and with the increase of the loading level of them. Silica fillers increased these properties more than alumina fillers. The largest value of ultimate tensile strength, modulus of elasticity at 100% elongation, and percentage of elongation at break were (67 MPa, 13MPa, and 172%) respectively for the SBR composite reinforced with 25 pphr of silica fillers. The minimum resilience was (65.59%) for the styrene butadiene rubber reinforced with 25 pphr of silica, also it has the largest values of hardness and minimum values of abrasion wear rate; which are (85 IRHD and 0.91 mm~3/mm) respectively. The physical properties are significantly affected by the variables, so that the liquids effect (swelling) was distinctively affected by the loading level of reinforcing fillers. The thermal conductivity was also increased with the addition of the reinforcing fillers and with the increase of the loading level of reinforcing fillers. Alumina fillers increase the thermal conductivity more than silica fillers. The specific gravity for rubber composite was increased with the increase of loading level of reinforcing fillers.