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Hydrolyse von Harnstoff-Formaldehyd-Harzen

Auflösung des Spangefüges in Holzwerkstoffen durch hydrolytischen Abbau der Leimfuge
Hydrolysis of urea-formaldehyde resins - disintegration of wood-based panels due to hydrolytic degradation of the glue joint
: Fleischer, O.; Marutzky, R.


Holz als Roh- und Werkstoff 58 (2000), Nr.5, S.295-300
ISSN: 0018-3768
Fraunhofer WKI ()
Aminoplast; Formaldehydharz; Hydrolyse; Spanplatte; amino resin; formaldehyde resin; Hydrolysis; particleboard

The hydrolytic degradation of urea-formaldehyde resins (UF) has gained new relevance since the development of procedures for reuse of particle- and fibreboards based on steam hydrolysis. In Germany, today 100.000 tons of used particleboards are recycled by thermo-hydrolytical processes annually. This work points out the role of resin hydrolysis in these recycling processes. Therefore, the behaviour of ground particleboards as well as pure, hardened UF resin under hydrolytic conditions was investigated. Influences of temperature and pH value were assessed to estimate their effect on the hydrolysis process.