Effect of Hydrophobic Silica Particles on Mechanical Properties of Bromobutyl Rubber (BIIR)

Abstract Silica is one of the most important reinforcing fillers in rubber industry. As an excellent agent, it can endow with higher tensile strength, elongation at break, elasticity, heat resistance, tear etc., and widely used products. BIIR has good air tightness, fatigue aging chemical processing performance, so tires other industries. In this paper, three hydrophobic nano-powder materials, silica airgel, fumed precipitated silica, were added to during mixing vulcanization. The effects materials on physical mechanical properties compared. results show that all effectively improve BIIR, among which airgel significant enhancement effect BIIR. strength 40% airgel-reinforced vulcanized be increased from 2.42MPa 5.84MPa. 100% constant stress 0.34MPa 1.04MPa, while high (19.07N/mm), hardness extremely (89HA), thermal conductivity as low 0.13439 (W/m·K).