|
Scission
of Cross-linking Element of Cross-linked Polymer using Supercritical
Alcohol
Toshiharu GOTO,
Takanori YAMAZAKI
Hitachi Cable, Ltd. 5-1-1 Hitaka-cho, Hitachi-shi, Ibaraki, JAPAN
Nippon Gomu Kyokaishi,(2004),77(10),359-364 General Review in Japanese
Abstract
The material recycling
of cross-linked polymer is difficult because of its low fluidity born
of cross-linking element. There are several researches that decompose
the cross-linked polymer to improve the fluidity of cross-linked polymer
using share stress or heat. But it is hardly to sever the cross-linking
element of Si-XLPE (silane cross-linked polyethylene) selectively
by these technique. So, recycling rate of Si-XLPE was not improved
drastically because of the poor processability and mechanical properties
of the recycled PE. We found out that the cross-linking element of
Si-XLPE could be severed selectively by supercritical alcohol. The
efficient process for reforming the Si-XLPE by supercritical alcohol
is necessary to industrialize this technique. This is the common problem
for the application of supercritica1 fluid. We suggested the continuous
process using extruder for supercritical fluid. It was indicated that
the twin-screw extruder could be used as the continuous reactor of
the supercritical alcohol. The properties of the products satisfy
the standard of the insulation of 600V cross-linked polyethylene cable.
More research for industrializing this technique will be prosecuted.
Keywords:
Silane cross-linked polyethylene, Supercritical alcohol, Extruder,
Continuous process, Recycle
Close
|
|