Method and apparatus for decomposition treating article having cured thermosetting resin
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsTakahiko Terada, Hiroshi Onishi
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Abstract
There is disclosed a method of decomposition treating a waste article having cured thermosetting resin comprising the steps of: (a) bringing the waste article having cured thermosetting resin into contact with a decomposing fluid containing a solvent, which can decompose the resin, in a decomposition bath and (b) heating the fluid at a temperature not lower than 250° C. and lower than the critical temperature of the solvent. Thereby, a waste article containing cured thermosetting resin is easily decomposed and waste resins and other components therein are recycled and reused as resources.
Claims19
A method of decomposition treating a waste article having cured thermosetting resin which comprises at least one selected from the group consisting of cured epoxy resin, cured phenol resin and cured polyurethane resin, said method comprising the steps of:
- (a) bringing the waste article having cured thermosetting resin into contact with a decomposing fluid containing a solvent, which decomposes the cured thermosetting resin when heated, in a decomposition bath and
- (b) heating the decomposing fluid at a temperature not lower than 250° C. and lower than the critical temperature of the solvent.
A method of decomposition treating a waste article having cured unsaturated polyurethane resin, said method comprising the steps of:
- (a) bringing said waste article having cured unsaturated polyurethane resin into contact with a decomposing fluid containing a solvent in a decomposition bath, said solvent being selected from the group consisting of 2-methoxyethanol, 2-ethoxyethanol, 2-dimethoxyethanol, 2-isopropoxyethanol, 2-butoxyethanol, 2-isopentyloxyethanol, 2-hexyloxyethanol, 2-phenoxyethanol, 2-benzyloxyethanol, 1-methoxy-2-propanol, 1-ethoxy-2-propanol, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, dipropylene glycol monomethyl ether, dipropylene glycol monoethyl ether, triethylene glycol monomethyl ether, and tripropylene glycol monomethyl ether;
- and
- (b) heating said decomposing fluid at a temperature not lower than 250° C. and lower than the critical temperature of said solvent.
A method of decomposition treating a waste article having cured unsaturated polyurethane resin, said method comprising the steps of:
- (a) bringing said waste article having cured unsaturated polyurethane resin into contact with a decomposing fluid containing a solvent in a decomposition bath, said solvent being selected from the group consisting of tetralin, biphenyl, naphthalene, 1,4-hydroxynaphthalene, naphthol, 1,4-naphthoquinone, pitch, creosote oil, methyl isobutyl ketone, isophorone, 2-hexanone, 2-heptanone, 4-heptanone, diisobutyl ketone, acetonyl acetone, phorone, cyclohexanone, methylcyclohexanone and acetophenone;
- and
- (b) heating said decomposing fluid at a temperature not lower than 250° C. and lower than the critical temperature of said solvent.
Dependencies are inferred from the claim text.