锡偶联型充油苯乙烯-异戊二烯-丁二烯三元共聚物的结构、性能及应用

摘要

The tin-coupled styrene-isoprene-butadiene copolymer ( SIBR ) was synthesized with n-BuLi as initiator, cyclohexane as solvent, tin tet-rachloride as coupling agent, and the oil-extended SIBR(Sn-Oil-SIBR) was prepared by mixing SIBR and aromatic oil in a 500 L pilot plant. The structure, properties and application in tread rubber of Sn-Oil-SIBR were investigated, and the performance of Sn-Oil-SIBR was compared with that of solution-polymerized styrene-butadiene rubber (SSBR). The results showed that the tensile strength, modulus at 300% , elongation at break of Sn-Oil-SIBR was more than 17.0 Mpa, 8.5 Mpa and 450% respectively. The glass transition temperature of Sn-Oil-SIBR ranged from - 40℃ to - 37℃ , and the loss factor at 0℃ was more than 0. 350 0 and at 60℃ less than 0. 120 0, indicating Sn-Oil-SIBR possessed excellent balance between wet skid resistance and rolling resistance. The performance parameters of Sn-Oil-SIBR could meet the need of high performance tread rubber. Compared with SSBR, Sn-Oil-SIBR had similar mixing behavior and mechanical properties , faster vulcanization rate, lower rolling loss and higher wet skid resistance.%在500 L聚合装置中,以正丁基锂为引发剂、环己烷为溶剂、四氯化锡为偶联剂,合成了锡偶联型苯乙烯-异戊二烯-丁二烯三元共聚物(SIBR),并采用湿法充油技术制备了锡偶联型充油SIBR(Sn-Oil-SIBR),对其结构、性能以及将其作为轮胎胎面胶的性能进行了研究,并与溶聚丁苯橡胶(SSBR)的性能进行了比较.结果表明,Sn-Oil-SIBR的拉伸强度超过17.0 MPa,300％定伸应力大于8.5 MPa,扯断伸长率大于450％；玻璃化转变温度为-40～-37℃；0℃时的损耗因子(tanδ)值大于0.350 0,60℃时的tan δ值小于0.1200,抗湿滑性和滚动阻力之间的平衡性较好,各项性能指标满足高性能轮胎对胎面胶的要求.与SSBR相比,Sn-Oil-SIBR的混炼行为接近,硫化速率较快,力学性能相当,用作胎面胶时滚动损失较低,抗湿滑性较好.