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Influence of Screw Configurations on Grafting Reactive Extrusion in Co-Rotating Twin Screw Extruder

Author: CaoBin
Tutor: MaXiuQing
School: Beijing University of Chemical Technology
Course: Mechanical Design and Theory
Keywords: Intermeshing co -rotating twin-screw extruder Numerical Simulation Graft reactive extrusion
CLC: TQ320.663
Type: Master's thesis
Year: 2007
Downloads: 169
Quote: 3
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Abstract


A twin-screw extruder as a continuous reactor is widely used in the reactive extrusion. Issues by changing the replacement segment screw components (including the conventional screw element stagger angle of 30 ° and 150 ° kneading blocks component, S-type components, toothed disc elements, NI-MPE), using numerical simulation analysis and experimental study combined method of engagement with the twin-screw melt grafting reaction extrusion process, provide some theoretical basis for the preferred twin screw extruder screw configuration. The subjects using professional software POLYFLOW six screw configuration replacement segment simulation of the flow field, and the simulation results were compared with various screw elements mixed performance; by fullness experiment, the residence time distribution experiment and immiscible blends experiments further study of the mixed performance of the replacement segment screw element, and to verify the accuracy of the simulation results; MAH melt grafting of LDPE experimental study of screw configuration for reactive extrusion process. The numerical simulation results show that: the staggered angle of 150 ° kneading blocks components (KB150/120), dispersive mixing capabilities and axial distribution of mixed the highest new screw element (S-type elements, toothed disc elements, the NI-MPE) having a distribution of high axial mixing ability, conventional threaded element (SE30/120), the dispersion and distribution of the mixing performance worst. Experimental results show that: the engagement with the twin-screw extruder screw configuration for MAH melt grafting LDPE reactive extrusion extrusion process has a great impact on the grafting reaction, especially the various screw elements mixed performance (including the distribution of mixing performance and dispersing mixing performance) and full degrees has a significant impact on the grafting reaction process, both high distributive mixing capacity and dispersion of the mixing ability and a high filling degree of the screw element corresponding to the screw configuration can provide more samples with a high grafting rate. The kneading block element wherein the stagger angle of 150 ° corresponding to the screw configuration, the sample obtained in grafting rate, new screw element can be effectively improved sample grafting rate of the replacement segment. The screw components of the experimental mixing performance with numerical simulation results, the numerical simulation analysis method used in this paper can be used to select the melt grafting reaction extrusion screw configuration combinations and new screw element design and analysis.

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CLC: > Industrial Technology > Chemical Industry > Synthetic resins and plastics industry > General issues > Production process and production technology > Forming > Extrusion
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