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Study on Melt Mixing of Nano Powder and Polymer in Co-Rotating Twin Screw Extruder

Author: SunShiQiang
Tutor: FengLianXun；LuoBing
School: Beijing University of Chemical Technology
Course: Mechanical Design and Theory
Keywords: Nanocomposites Intermeshing co -rotating twin-screw extruder Particle tracking method Dispersive mixing Residence time distribution Powder clumps broken
CLC: TB383.1
Type: Master's thesis
Year: 2006
Downloads: 173
Quote: 4
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Abstract


Nano- composite (plastic) is currently one of the focuses of the research of new materials , and the twin-screw extruder mixing capabilities with high dispersion of continuous processing equipment , nanopowder and polymer in the same twin-screw extruder melt mixing process for the production of nanocomposites has theoretical significance and practical value . First of the powder clumps of internal structure and its crushing mechanism in the field of polymer melt flow analysis , and the introduction of the differential equations clumps size changes over time , the role of the flow field . In order to compare the different mixing elements dispersed mixed ability , conventional screw elements , narrow kneading block elements wide kneading block elements as well as the new hybrid components VCR components runner three-dimensional isothermal flow field simulation and analysis . By simulation of the flow field flow state , the shear rate and pressure fields dispersive mixing and conveying capacity ; through dynamic simulation of the flow field of the particle tracking method and its statistical treatment , the residence time distribution, the distribution of the maximum shear rate , the fixed percentage of the dot subjected to the shear rate distribution changes over time , the size distribution of the powder agglomerates mixing capabilities change with time or the like dispersed with mixing elements related statistically significant results . Numerical simulation analysis results show that : engage in the discussion in this article with the twin-screw mixing elements , kneading blocks wide components dispersive mixing strongest VCR components , followed by conventional screw element is the weakest ; VCR components distribution mixed strongest wide kneading block elements , followed by conventional screw element is the weakest . Experimental studies have shown that the experimental mixing elements obtained dispersive mixing capability relativities and mold

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