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- Conflict of Interest
- In relation to this article, we declare that there is no conflict of interest.
- Publication history
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Received August 30, 2023
Accepted December 29, 2023
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Preparation of De-crosslinked Polyethylene from Waste Crosslinked High-Density Polyethylene Using Supercritical Twin-Screw Extrusion
Abstract
This study examined a method for de-crosslinking high-density polyethylene (HDPE) for use in heating pipes using supercritical
fl uids and recycling them into polyethylene. Waste crosslinked HDPE is mostly incinerated because it is a thermosetting
plastic and cannot be recycled. Therefore, there is an urgent need to develop new recycling technologies for crosslinked
HDPE to prevent environmental pollution. Many experiments have been conducted under various subcritical and supercritical
conditions using methanol as the supercritical solvent to recycle crosslinked HDPE. Consequently, PE can be prepared via
a de-crosslinking reaction. To recycle crosslinked high-density polyethylene, we conducted experiments at three rotational
speeds (80, 250, and 400 rpm) of the screw under the conditions of various temperatures (300–360
