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Method for recycling a cross-linked polymer

A cross-linked polymer, recycling technology, applied in the production of bulk chemicals, plastic recycling, recycling technology, etc., can solve the problems of difficult recycling and regeneration of thermoplastic polymers, and achieve excellent results and the effect of improving industrial value.

Inactive Publication Date: 2012-11-07
HITACHI CABLE LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Therefore, since the cross-linking part has the same chemical bond as the main chain of the polymer, it is difficult to preferentially cut the cross-linking by the above-mentioned method to form a thermoplastic polymer recycling.

Method used

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  • Method for recycling a cross-linked polymer
  • Method for recycling a cross-linked polymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] The peroxide cross-linked polyethylene with a gel ratio of 85% was molded into a sheet of 1 mm, which was pulverized into pellets of 2 to 3 mm. After filling 6.0 g of this particle in the autoclave (reaction vessel) of 200 ml, replace the air in the autoclave with carbon dioxide, then, add 1.0 g of nitrogen dioxide (NO 2 ) and carbon dioxide gas for 18 hours under the conditions of 19MPa and 85°C.

[0062] After the reaction, the reaction container was cooled, the polymer was recovered, and the molecular weight distribution and the gel fraction as an index of the degree of crosslinking were measured.

[0063] Measurement conditions are as follows.

[0064] Molecular weight distribution is measured using o-dichlorobenzene as a solvent by high-temperature GPC (gel permeation chromatography). Even if the number average molecular weight of the recovered product decreased, the result of remaining high molecular weight components of 300,000 or more was judged as 0, and the ...

Embodiment 2

[0067] It is the same as Example 1 except replacing the peroxide crosslinked polyethylene in Example 1 with silane crosslinked polyethylene.

Embodiment 3

[0069] It was the same as Example 1 except that the peroxide-crosslinked polyethylene in Example 1 was replaced with ethylene-vinyl acetate crosslinked by an electron beam.

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Abstract

A cross-linked polymer is recycled by decomposing a C-C bond by an oxidative decomposition reaction using a nitrogen oxide in a supercritical carbon dioxide. A reaction temperature, a pressure and a reaction time are controlled such that a nitrogen oxide is sorbed at a branch point of a C-C bond of the cross-linked polymer. As a result, the branch point of the C-C bond is preferentially oxidized to cleave the C-C bond.

Description

technical field [0001] The present invention relates to a method for recycling cross-linked polymers. The method is capable of recycling and recycling the cross-linked polymers that have been discarded in landfills because they have no thermoplasticity and are difficult to recycle. Background technique [0002] Polymers having continuous C-C bonds are widely used as covering materials for electric wires and cables, materials for connecting parts, materials for hot water supply pipes, and heat storage materials represented by polyolefin-based polymers. The formability of such materials is closely related to the degree of branching of C-C bonds containing crosslinked structures. [0003] In particular, cross-linked polymers cannot be melted by heat due to their three-dimensional network structure, and it is difficult to regenerate them by molding them as waste. Therefore, the current situation is that almost all used materials are disposed of in landfills or incineration due ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J11/16C08L23/00
CPCC08J11/16C08J2323/04Y02P20/54Y02W30/62
Inventor 后藤敏晴山崎孝则葭田真昭船山泰弘
Owner HITACHI CABLE LTD