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首页> 外文期刊>International Polymer Processing: The Journal of the Polymer Processing Society >Paste Extrusion of Polytetrafluoroethylene:Temperature,Blending and Processing Aid Effects
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Paste Extrusion of Polytetrafluoroethylene:Temperature,Blending and Processing Aid Effects

机译：聚四氟乙烯的糊状挤出：温度，混合和加工助剂的作用

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Blends of different PTFE fine powder resins have been prepared and extruded in an attempt of improving the PTFE paste extrusion process and/or the extrudates.The extrusion pressure and the mechanical properties of the extrudates were found to fall between those exhibited by the pure components.While this is an expectable behavior,it offers opportunities for controlling the degree of fibrillation needed in the final products by mixing highly fibrillated with low fibrillated PTFE resins.Boron nitride and organically modified montmorillonite clays (solid lubricants) are also tested as additives to the lubricants used in the PTFE paste extrusion in order to identify enhanced processing aids.It was found that the addition of boron nitride and clays increase the extrusion pressure but at the same time improve the mechanical properties of the final extrudates in most cases.This again offers possibilities for controlling the final mechanical properties by controlling the degree of fibrillation,i.e.,by adding a small amount of solid lubricants to adjust pressure,fibrillation,and thus the final mechanical properties.Finally,it is shown that fibrillation depends on temperature.Moreover,the mechanical properties of extrudates increase as the temperature goes through its two transition temperatures of 19 deg C and 30 deg C that render PTFE particles more deformable and prone to fibrillation.
机译：为了改善PTFE糊料的挤出工艺和/或挤出物，已制备并挤出了各种PTFE细粉树脂的共混物，发现挤出物的挤出压力和机械性能介于纯组分之间。虽然这是一种预期的行为，但它通过将高原纤化度与低原纤化PTFE树脂混合提供了控制最终产品中原纤化程度的机会。氮化硼和有机改性的蒙脱土（固体润滑剂）也已作为润滑剂的添加剂进行了测试用于PTFE糊料挤出中以鉴定增强的加工助剂。发现氮化硼和粘土的添加增加了挤出压力，但同时在大多数情况下改善了最终挤出物的机械性能，这再次提供了可能性通过控制原纤化程度来控制最终的机械性能即，通过添加少量的固体润滑剂来调节压力，原纤化，从而调节最终的机械性能。最后，表明原纤化取决于温度。此外，挤出物的机械性能会随着温度的升高而升高。 19摄氏度和30摄氏度的转变温度使PTFE颗粒更易变形并易于原纤化。

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