Surface Modification Of Silica And Study On Solution Styrene Butadiene Rubber Filled With Modified Silica

The high density of hydroxyl groups of silica surface makes poor compatibility with rubber that seriously affects the performance of composites. This paper aims at using coupling agent to modify silica to improve the compatibility with rubber and enhance the mechanical properties of composites, and reduce the rolling resistance. The effect of modification was discussed separately through the processing time, various coupling agents and different dosage of coupling agent, as well as the properties of modified silica composites were studied. The results of this study are listed as follows:(1) Silica modified with can reduce its aggregation, which will help its dispersion in rubber. The amount of physical adsorption coupling agent at modified silica surface is susceptible to modification time, species and dosage of coupling agent, and other kinds of factors. The amount of coupling agent chemically adsorbed at modified silica surface is determined by the amount of hydroxyl number;(2) The different coupling agent were used, the grafting rate of coupling agent were different. And the particle size of KH580/VN3 is the smallest that means its modification effectiveness is relatively good.(3) The results show that the tan ? at 60° decreases with the increase of the processing time while the dispersion of modified silica increases. Meanwhile, when modification time was 48 hours, this modified silica filled SSBR can keep the wet skid resistance performance, and reduce rolling resistance at the same time.(4) It was found that KH570/VN3 and KH580/VN3 are dispersed well in rubber matrix, but Si69/VN3 is not. KH570/VN3 rubber composites have higher mechanical properties than others, but KH580/VN3 is suitable for high filling. The mechanical properties and degree of dispersion of modified silica of rubber composites increase with increasing the content of KH580 used at modification reaction. Composites filled with 4:100(the ratio of silane coupling agent and silica) modified silica have lower rolling resistance and suitable wet skid resistance.(5) The formulation of modified silica/SSBR was optimized to meet good mechanical properties, low compression heat build-up as well as suitable rolling resistance and wet skid resistance. The results suggest that SSBR 2466 and SSBR 5025-2HM blend is a good choice.