Research On Silica Surface Modification And Its Influence On Ssbr Reinforcement Properties

In recent years, silica-filled SSBR is one of the research hotspots in tire technology field. But the surface of silica with strong polarity and poor compatibility with SSBR, so some new technical difficulties come in practical application.Therefore, to enhance the dispersion of silica in the rubber and improve the SSBR reinforcement through surface modification has important practical significance for the preparation of high performance green tire.In this paper, we use high vinyl SSBR2557A as the rubber matrix and high dispersion of silica1165as filler. This paper selected coupling agents Si69and Si747, active agent DPG and PEG-4000and two types of nitride rubber NBR1846and NBR3305as surface modifier. We systematically studied the effect of the types and dosage of coupling agent and active agent, the dosage of two kinds of NBR and modified process on structure and propertiesThe results showed that both ofthe two types of coupling agent could enhance the dispersion of silica and improve physical and mechanical properties and abrasion resistance of vulcanizate. With the same dosage, the performance of rubber modified by NXT was better than rubber modified by Si747. With the increasing of the dosage of NXT, the tanδ at0℃increased and the tan8at60℃decreased.The results also indicated that compared with active agent PEG, the scorch time of compound containing the DPG was longer, cure time was shorter and cure rate was faster. The increase of DPG dosage could increase the tensile strength and the hardness of vulcanized rubber, but the increase of the content of PEG could reduce the tensile strength.And larger dosage of DPG was harmful for the rolling resistance.Based on the strong interaction with NBR and silica, Silica modified through NBR could improve the reinforcement of SSBR. The results show that both NBR1846and NBR3305could shorten the mixing scorch time and cure time and improve the abrasive resistance.Appropriately increasing the mixing temperature and mixing time prolonged contributes to the interaction Optimization experiments showed that, moderate NBR1846and NBR3305could strengthen wet skid resistance and lower rolling resistance.Payne effect of compound was minimum and abrasion resistance of vulcanizate was highest for NBR1846and process2(first mixed Silica+NBR).At the same time, the vulcanizate could obtain high wet skid resistance and lower rolling resistance. As for NBR3305, Silica dispersed well and wear resistance was better using processl (first mixed NBR/SSBR). Process2could enhance wet skid resistance and improve the rolling resistance.