Study On The Structures And Properties Of Green Tire Tread Rubber

Structures and properties of different kinds of SSBR were studied in this paper, and we have got the results that the properties of SSBR could fulfill the requires of tire tread when St was 25～30%, Bv% was 30～50%,and the processing properties of SSBR became better after extending proper oil,however, its physical properties relied little on the variety and mass of fillers. Structures and properties of the rubber filled with silica modified by equal mol mass of silane coupling agents (Si-69 or Si-75) were studied in this paper. The results showed that the scorch safety, aging resistance and other properties of rubber filled with silica modified by Si-75 were more regular with the fillers mass changed, compared with that containing Si-69. And then achieved the base formula fulfilled tread rubber by adjusting the mass of different fillers and silane coupling agents. With the method of adding proper mass of sulfur into the rubber filled with silica modified by Si-75, We could get the rubber properties similar to that containing Si-69 now used popular, therefore reduced the cost. Otherwise, Two different mixing methods such as normal temperature mixing method and reaction blend method were compared, by studying processing flow behavior, physical mechanical properties, dynamic mechanical properties and microstructures of the rubber composites, We got the result that the hardness and permanent set of S-SBR composite prepared by reaction blend decreased, Modulus and bounded rubber increased without any change of Tensile strength, The general properties were the best. In addition, By changing the mass ratio of different rubber, we prepared the compounds with the method of reaction blend, and also concluded that when SSBR/BR was 70/30,the mechanical properties could meet to the tread rubber with less heat built up, perfect abrasion resistance and lower rolling loss. We also have manufactured the 195/65-R15 Semi-stell radial tyre in factory with the Sn-Star SSBR of our own, and the results have showed that its properties were better than that of SSBR5025 manufactured by bayer of Ger.