Modification of waste silicas by silanes and titanates and their use as reinforcing fillers in elastomer composites

Results on the use of waste silica, a by-product in the production of aluminum fluoride, as an elastomer filler are presented. Modification of the purified silica surface with silane and titanate coupling agents has been carried out. The effect of the type and amount of modifying agent on the physico-mechanical properties in vulcanizates of butadiene-styrene rubber and in polyurethane elastomers has been tested. The mechanical properties of butadiene-styrene rubber vulcanizates filled with waste silica show that the most favorable modifying effect is shown by mercaptosilanes A-189 and A-1893, polysulfide Si-69, and titanate KRTTS, as indicated by increased strength parameters. However, testing of the mechanical properties in polyurethane elastomers filled with waste silica has demonstrated that silica modification with aminosilanes A-1100 and A-1120 yield polyurethane compositions of optimum strength parameters.