多级磨盘式强剪切分散混炼器对HDPE/nano-CaCO_3体系流变行为及分散性能的影响

Influence of Intensive Shear and Disperse of Multi-stage-mill Mixer on Rheological Performance and Dispersing of HDPE/nano-CaCO_3 Composites

塑料填充改性技术的进步和大量的研究及生产实践证明,在相同的填充条件下,超细填料与普通填料相比填充改性效果更好,效率更高,因此超细粒子在高聚物基体中的分散成为一个关键因素。结合磨盘研磨产生机械剪切以及齿盘分流分散的思想,设计了一套强剪切分散式混炼器。实验结果表明,经过混炼器作用的试样,能使CaCO3粒子呈原生态分布,流动性变好,熔体指数增加,黏度下降;添加抗氧剂以后,填充体系的冲击强度大大提高。

The advances of filling modification in polymer industry and lots of researches and productive practices have approved that in the same filling conditions, the modification of the ultra-fine filler is better and more effective than the common ones, so the dispersion of ultra-fine fillers in the polymer materials is an important factor. A multi-stage-mill mixer was developed by combining the merits of traditional mill and mixer with static and dynamic pins. Conclusions in the investigation were as follows：the mixer had good dispersion effect for filled composites;nano-CaCO3 particles existed as primary particles;the viscosity of HDPE composites was reduced;the antioxidant addition effectively inhibited degradation and the reduction of impact strength.