Abstract: Based on the computational fluid dynamics theory, the physical mixing modeling of highdensity polyethylene (HDPE) and polystyrene (PS) in a internal batch mixer was established. By using Fluent software, the process of the mixed polymer in the mixer with double rotor was studied. The results showed thatthe mixing efficiency and asymmetry of the flow field were improved when the twinrotor mixer rotated in higher speed. After a period of time, the single polymer volume fraction at each position reached steady in the extruder.

Key words: Internal batch mixer,     , HDPE/PS blends,    , Mixing efficiency,     ,  Computational fluid dynamics (CFD)

摘要： 依据计算流体动力学理论, 建立了密炼机内高密度聚乙烯( HD P E) 和聚苯乙烯( P S) 物理共混的二维 理论模型, 运用F l u e n t软件研究了共混聚合物在双转子密炼机中的混合过程, 研究了密炼机在不同转速和转速比下 的混合过程, 并分析了密炼机局部位置的共混效率。研究表明, 随着密炼机转子转速的增加, 共混效率逐渐增强, 且 达到稳定状态的时间逐渐减小。随着转速比的增大, 密炼机产生流场的非对称性逐渐增强, 共混效率逐渐增强。

关键词: 密炼机, HD P E / P S共混聚合物, 混合效率, 计算流体力学( C F D)