挤出机螺杆结构对PET纤维母粒分散性能的影响  

Effect of Extruder Screw Structure on PET Fiber Masterbatch Mixing Performance

作　　者：高可正 胡蝶[1] 丁筠[1] 金志明[1] 乔辉[1] Gao Kezheng;Hu Die;Ding Yun;Jin Zhiming;Qiao hui(Beijing University of Chemical Technology, Beijing 100029, China)

机构地区：[1]北京化工大学

出　　处：《工程塑料应用》2019年第5期100-104,共5页Engineering Plastics Application

基　　金：国家十三五重点研发计划项目(2016YFB0302801)

摘　　要：对同向啮合双螺杆挤出机混合段选用一定规格的螺杆元件以不同的排序方式组成三种螺杆组合,研究了螺杆结构对聚对苯二甲酸乙二酯(PET)纤维母粒分散性能的影响。在Solid Works 中建立螺杆的物理模型后采用Polyflow 软件对三种螺杆组合进行有限元流场模拟分析,运用示踪粒子法统计分析不同螺杆组合的混合效果。以加权平均剪切应力、累积最大剪切速率表征螺杆组合的分散混合能力,以累积停留时间、回流量与回流系数表征螺杆组合的分布混合能力。基于模拟结果,用同向双螺杆挤出机对不同螺杆组合的混合流场进行实验,对经由不同混合流场制备出的PET 母粒的形态进行扫描电镜分析。结果表明,螺纹元件与捏合块元件交错排布的螺杆组合具有更强的分布混合与分散混合能力,更有利于物料的混合。The effect of the screw structure in the co-rotating twin-screw extruder mixing section on the dispersion performance of PET fiber masterbatch was studied. Screw elements of certain specification were used to form three screw combinations in different order. The physical model of the screw was established by Solid Works software. After that,Polyflow software was adopted to simulate the finite element flow field of the three kinds of screw combinations. Tracer particle method was used to characterize the mixing effect of different screw combinations. The weighted average shear stress and cumulative maximum shear rate were used to characterize the dispersion mixing capacity of the screw combination. The distribution mixing capacity of the screw combination was characterized by cumulative residence time,return ow and re ux coef cient. Experiments were performed on different mixed ow elds using co-rotating twin screw extruder. The morphology of prepared PET masterbatch was analyzed by scanning electron microscope. The results show that the screw combination of the screw element and the kneading block element staggered arrangement has stronger distribution mixing and dispersing mixing ability, which is more favorable for material mixing.

关 键 词：螺杆结构 物理模型 有限元流场模拟 示踪粒子法 

分 类 号：TQ320.5[化学工程—合成树脂塑料工业]