叠片式密炼机转子结构对混合特性的影响

Effects of Rotor Structures on Mixing Characteristics of Laminated Internal Mixer

利用自行设计的基于微分原理的叠片转子密炼机,对不同结构转子的混合特性进行了实验研究和理论分析。通过数值模拟的方法,对不同结构转子混炼流场特性和混合作用进行了理论分析;借助于混合实验,对不同结构转子的混合效果进行了评估和表征。研究结果表明,随着螺棱的螺旋角从21.7°减小到7.6°,混炼流场的拉伸作用变弱了,更少比例的物料经历高水平的累积解聚功和时间平均混合效率;同时,实验制得的环氧树脂/碳纳米管样品的拉伸强度从65.34MPa减小到62.82 MPa,断裂伸长率从5.74%减小到5.31%。螺棱的长短棱之比对混合指数几乎没有影响,对累积解聚功和时间平均混合效率影响较小;当螺棱长短棱之比为2∶1时,样品具有更高的拉伸强度65.42 MPa和更高的断裂伸长率5.95%。

A laminated rotor internal mixer was designed according to differential principle. Numerical simulation was used to analyze the characteristics of the flow field and mixing effect with different rotor structures. Mixing experiments were conducted to evaluate and characterize the mixing effect with different rotor structures. With the angle of helix decreases from 21.7 ° to 7.6 °, stretching effect of mixing flow field becomes weaker and less proportion of material experiences high level of accumulated disagglomerating work （Mmix） and time-averaged of mixing efficiency （〈eη〉）; while the tensile strength of the epoxy resin / carbon nanotubes composites reduces from 65.34 MPa to 62.82 MPa and elongation at break decreases from 5.74% to 5.31%. The ratio of the long flight to the short flight almost has no influence on the mixing index and less impact on Mmix and 〈〈eη〉〉; the experimental results show that when the ratio of the long flight to the short flight is 2∶1, the sample has higher tensile strength of 65.42 MPa and higher elongation at break of 5.95%.