聚丙烯/无机纳米粒子在双螺杆挤出机内的分散混合效果数值模拟  

Numerical Simulation of Dispersion and Mixing Effect of Polypropylene/Nano-inorganic Particles in Twin-screw Extruder

作　　者：程建邦 于兵 陈峰峰 王一飞 李浩杰 姚爱英 陈占春[1,2] Cheng Jianbang;Yu Bing;Chen Fengfeng;Wang Yifei;Li Haojie;Yao Aiying;Chen Zhanchun(College of Mechanical and Vehicle Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Shanxi Experimental Teaching Center of Virtual Simulation,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学机械与运载工程学院,太原030024 [2]太原理工大学山西省虚拟仿真实验教学中心,太原030024

出　　处：《工程塑料应用》2021年第8期68-73,80,共7页Engineering Plastics Application

摘　　要：采用三维有限元数值模拟方法,研究了聚丙烯(PP)/无机纳米粒子在双螺杆挤出机的三种螺杆组合元件流道内的分散混合效果。通过对比分析三种螺杆组合下无机纳米粒子的剪切应力和剪切速率、停留时间分布及粒径分布等结果,发现含错列角45°捏合块的螺杆组合对其流场中大部分粒子的剪切作用最强,含错列角60°捏合块的螺杆组合次之,含错列角90°捏合块的螺杆组合最弱。与另两种螺杆组合相比,含错列角45°捏合块的螺杆组合流场中,无机纳米粒子团聚体的数量最少,剥离出的碎片数量最多,即在含错列角45°捏合块的螺杆组合条件下无机纳米粒子在PP熔体中的分散效果最好。Using a three-dimensional finite element numerical simulation method,the dispersion and mixing effects of polypropylene(PP)/nano-inorganic particles in the flow passages of three screw combination elements of twin-screw extruder were studied.Through comparative analysis of the shear stress and shear rate,residence time distribution and particle size distribution of nano-inorganic particles under the three screw combination elements,it is found that the screw combination containing kneading blocks with a staggered angle of 45°has the strongest shearing effect on most of the particles in the flow field,followed by the screw combination containing kneading blocks with a staggered angle of 60°,and the screw combination containing kneading blocks with a staggered angle of 90°is the weakest combination.Compared with the other two screw combinations,the screw combination containing kneading blocks with a staggered angle of 45°has the least amount of nano-inorganic particle agglomerates in the flow field and the largest number of stripped fragments,which indicates the dispersion effect of nano-inorganic particles in the PP melt turns out to be the best under the conditions of screw combination containing kneading blocks with a staggered angle of 45°.

关 键 词：聚丙烯 无机纳米粒子 螺杆组合 粒径分布 分散混合 

分 类 号：TQ320.64[化学工程—合成树脂塑料工业]