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对含有超高分子量聚乙烯组分的材料进行饥饿喂料挤出的特性

Properties of Starve-Fed Extrusion on a Material Containing a VHMWPE Fraction.

作者信息

Rathner Raffael, Tranchida Davide, Roland Wolfgang, Ruemer Franz, Buchmann Klaus, Amsüss Philipp, Steinbichler Georg

机构信息

Institute of Polymer Extrusion and Compounding, Johannes Kepler University Linz, Altenberger Str. 69, 4040 Linz, Austria.

Borealis Polyolefine GmbH, Sankt-Peter-Straße 25, 4021 Linz, Austria.

出版信息

Polymers (Basel). 2021 Mar 19;13(6):944. doi: 10.3390/polym13060944.

DOI:10.3390/polym13060944
PMID:33808540
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8003239/
Abstract

Single-screw extruders are usually operated with the screw fully filled (flood-fed mode) and not partially filled (starve-fed mode). These modes result in completely different processing characteristics, and although starve-fed mode has been shown to have significant advantages, such as improved mixing and melting performance, it is rarely used, and experimental studies are scarce. Here, we present extensive experimental research into starve-fed extrusion at feeding rates as low as 25%. We compared various operating parameters (e.g., residence time, pressure build-up, and melting performance) at various feeding rates and screw speeds. The results show a first insight into the performance of starve-fed extruders compared to flood-fed extruders. We explored starve-fed extrusion of a polyethylene material which contains a Very High Molecular Weight Polyethylene fraction (VHMWPE). VHMWPE offers several advantages in terms of mechanical properties, but its high viscosity renders common continuous melt processes, such as compression molding, ram extrusion and sintering, ineffective. This work shows that operating single-screw extruders in extreme starve-fed mode significantly increases residence time, melt temperature, and improves melting and that-in combination-this results in significant elongation of VHMWPE particles.

摘要

单螺杆挤出机通常在螺杆完全充满（全喂料模式）而非部分充满（饥饿喂料模式）的情况下运行。这些模式会产生截然不同的加工特性，尽管饥饿喂料模式已被证明具有显著优势，如改善混合和熔融性能，但它很少被使用，且相关实验研究也很匮乏。在此，我们针对低至25%的喂料速率下的饥饿喂料挤出进行了广泛的实验研究。我们比较了不同喂料速率和螺杆转速下的各种操作参数（如停留时间、压力建立和熔融性能）。结果首次揭示了饥饿喂料挤出机与全喂料挤出机相比的性能情况。我们研究了含超高分子量聚乙烯级分（VHMWPE）的聚乙烯材料的饥饿喂料挤出。VHMWPE在机械性能方面具有诸多优势，但其高粘度使得诸如压缩成型、柱塞挤出和烧结等常见的连续熔融工艺效率低下。这项工作表明，在极端饥饿喂料模式下操作单螺杆挤出机可显著增加停留时间、熔体温度，并改善熔融效果，而且综合起来，这会使VHMWPE颗粒显著伸长。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/a107/8003239/84958da15de9/polymers-13-00944-g017.jpg
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