环形微纳层叠挤出模具的结构设计与流场分析
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摘要
微纳层叠挤出技术通过对高聚物材料微观形态进行调控来提高多方面的性能,例如力学、阻隔性能等。针对目前微纳层叠挤出技术中层叠模具单位体积内层叠单元较少,流量较低的情况,提出了一种将层叠单元进行环向布置的创新设计思想。设计了用于环向布置的层叠单元流道结构,并提出了模具内单组层叠单元环向布置与多组层叠单元环向布置的具体方案。设计表明,在相同体积下该结构可以布置更多的层叠单元,流量是传统设计的4倍。同时,流道长度为传统设计的60%。利用Polyflow软件对层叠单元的流道进行了数值模拟,结果表明流道压力和速度分布均匀,整体压力降较低。
Micro-layer extrusion technology could improve several properties including mechanical and barrier properties by adjusting the micro-morphology of polymer materials. In view of the situation that the present mold used for micro-layer extrusion technology had few laminated unit amount in unit volume,a novel annular laminated mold used for micro-layer extrusion technology was introduced. The runner of the laminated unit used for annular arrangement was designed,the annular arrangement used for single set of laminated unit and multiple sets of laminated unit were introduced. The design shows that the new structure contains more laminated units and the melt flux is four times of the traditional design under the same mold volume. The flow field analysis of laminated unit based on Polyflow is performed,the results reflect that the pressure and velocity distribution of the laminated unit runner are uniform,the pressure drop along the extrusion direction is low.
Micro-layer extrusion technology could improve several properties including mechanical and barrier properties by adjusting the micro-morphology of polymer materials. In view of the situation that the present mold used for micro-layer extrusion technology had few laminated unit amount in unit volume,a novel annular laminated mold used for micro-layer extrusion technology was introduced. The runner of the laminated unit used for annular arrangement was designed,the annular arrangement used for single set of laminated unit and multiple sets of laminated unit were introduced. The design shows that the new structure contains more laminated units and the melt flux is four times of the traditional design under the same mold volume. The flow field analysis of laminated unit based on Polyflow is performed,the results reflect that the pressure and velocity distribution of the laminated unit runner are uniform,the pressure drop along the extrusion direction is low.
引文
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[3]周星.基于微纳层叠方法的高性能PVC材料制备及其性能的研究[D].北京:北京化工大学,2015.
[4]LIU R Y F,JIN Y,HILTNER A,et al.Probing nanoscale polymer interactions by forced-assembly[J].Macromol Rapid Commun,2010,24(16):943-948.
[5]JARUS D,HILTNER A,BAER E.Microlayer coextrusion as a route to innovative blend structures[J].Polym Eng Sci,2001,41(12):2162-2171.
[6]王乾.高阻隔性复合材料微纳层叠制备装置及其性能的研究[D].北京:北京化工大学,2012.
[7]李长金,焦志伟,钟雁,等.微层共挤出PP/PPCB导电复合材料的结构与导电性能[J].塑料工业,2014(3):98-102.
[8]戴坤添.基于微纳层叠技术的聚合物基高介电复合材料的制备及性能研究[D].北京:北京化工大学,2017.
[9]王佩璋,王澜.多层光干涉膜层结构的研究[J].塑料,2004(4):70-73.
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[11]四川大学.制备交替多层高分子复合材料的叠合装置:200610022348.6[P].2006-11-29.
[12]北京化工大学.一种纳米叠层复合材料制备装置:200920271878.3[P].2010-09-22.