密炼机转子转速对白炭黑补强溶聚丁苯橡胶性能的影响

分析溶聚丁苯橡胶(SSBR)5025-2，2564S和72612S分子结构，研究密炼机转子转速对SSBR与白炭黑的相互作用以及对胶料物理性能和动态力学性能的影响。结果表明：随着转子转速的提高，胶料的物理性能呈现不同的变化规律，其中72612S的拉伸强度和撕裂强度明显减小；5025-2和2564S的抗湿滑性能提高、滚动阻力降低，而72612S的抗湿滑性能和滚动阻力在转子转速为80 r·min^-1最佳。随着转子转速的提高，各胶料的弹性剪切模量(G ′)和低应变到高应变时的G ′变化幅度(G ′₀-G ′_100%)呈下降趋势，填料分散性变好，Payne效应减弱，而72612S剪切效果的提高不如其他两者明显；在相同转速下，白炭黑补强SSBR72612S的G ′₀-G ′_100%最小，白炭黑分散性较好。;The molecular structure of SSBR5025-2,2564S and 72612S was analyzed,and the in-fluence of the mixer rotor speed on the interaction between high dispersion silica and SSBR,as well as the physical and dynamic mechanical properties of the vulcanizates,were investigated.The results showed that,with the increase of rotor speed,the physical properties of the vulcanizates with different SSBR showed different change trends.The tensile and tear strength of the 72612S were significantly reduced.The wet skid resistance of 5025-2 or 2564S was improved and the rolling resistance was reduced, while the wet skid resistance and the rolling resistance of 72612S showed the best performance as the rotor speed was 80 r·min^-1.With the increase of rotor speed,both the G ′ value and ΔG ′(G ′₀-G ′_100%) of the vulcanizates decreased,the filler dispersion was improved,and the Payne effect decreased.It was also found that the increase of shear effect of 72612S was not as obvious as that of the other two.Under the same rotor speed,compared with that of 5025-2 and 2564S,the ΔG ′of 72612S filled with high dispersion silica was lower,and the dispersion of silica was better