Recovery process for crosslinked polyethylene wastes

The invention discloses recovery process for crosslinked polyethylene wastes. The process comprises the following steps: crushing the crosslinked polyethylene wastes and then adding the crushed wastes into an extruder, subjecting a molecular chain of the crosslinked polyethylene to depolymerization...

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Bibliographische Detailangaben
Hauptverfasser:	LU YANG, CHEN JIANDANG, WEN YUNHAO, LI ZHENHUA, LEI HUA
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G CHEMISTRY CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATERTREATMENT OR WASTE MANAGEMENT COMPOSITIONS BASED THEREON COMPOSITIONS OF MACROMOLECULAR COMPOUNDS GENERAL PROCESSES OF COMPOUNDING GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE THEIR PREPARATION OR CHEMICAL WORKING-UP WORKING-UP
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Beschreibung
Zusammenfassung:	The invention discloses recovery process for crosslinked polyethylene wastes. The process comprises the following steps: crushing the crosslinked polyethylene wastes and then adding the crushed wastes into an extruder, subjecting a molecular chain of the crosslinked polyethylene to depolymerization under the actions of high temperature and alternating shear so as to realize recycling, wherein an extrudision temperature of the extruder is 240 to 300 DEG C, and die pressure is 3 to 20 MPa; a screw of the extruder has a length-diameter ratio of 56 to 80 and a rotating speed of 400 to 1200 rpm, so shear line speed exerted on a material is more than 4 m/s; the alternation cycle of maintaining shear force of a screw combination of the extruder is 2 to 10 cycles; processing time of the material is more than 30s; and the extruder is a single-screw extruder or a double-screw extruder. The recovery process provided by the invention can depolymerize the crosslinked polyethylene with environmental protection and high efficiency and enables the depolymerized crosslinked polyethylene to have high mobility and machinability.