Study On Melt Mixing Of Nano Powder And Polymer In Co-Rotating Twin Screw Extruder

Nano composites(plastic) is one of the focus in present day, and co-rotating twin screw extruder has better dispersive mixing performance than other mixing device. As said before the study on melt mixing of nano powder and polymer in co-rotating twin screw extruder will achieve both theoretical and practical values.This article analyses the internal structure and dispersive mechanism of agglomerates in melt polymer flow field, and differential equation is introduced to calculate the evolution of agglomerates' size. To compare the dispersive mixing ability of different mixing elements, 3D isothermal flow field of normal screw element, narrow kneading disc element, wide kneading disc, and VCR element which is one of the new mixing elements are simulated. Based on the numerical simulation of instantaneous static flow fields, the shear rate field and pressure field are analyzed. With the numerical simulation of dynamic flow fields by particle tracking analyze method and statistical analyses, residence time distribution, max shear rate distribution, shear rate distribution of certain percent particles vs. time and the size distribution vs. time of agglomerates are analyzed.