Modified wood product and a process for producing said product

A process for preparing a modified wood comprising the steps of a) resin treatment of solid wood having a moisture content of at least 10%; resin solution comprises phenol formaldehyde, phenol urea formaldehyde, lignin, tannin or a mixture thereof, followed by b) a thermal modification step wherein...

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Bibliographische Detailangaben
Hauptverfasser:	Mayes, Duncan, Pynnönen, Janne, Stöd, Reeta-Maria
Format:	Patent
Sprache:	eng
Schlagworte:	ADHESIVES CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW ORSIMILAR MATERIALS CHEMICAL PAINT OR INK REMOVERS CHEMISTRY COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS COMPOSITIONS BASED THEREON COMPOSITIONS OF MACROMOLECULAR COMPOUNDS CORRECTING FLUIDS DYES FILLING PASTES INKS METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NAILING OR STAPLING MACHINES IN GENERAL NATURAL RESINS ORGANIC MACROMOLECULAR COMPOUNDS PAINTS PASTES OR SOLIDS FOR COLOURING OR PRINTING PERFORMING OPERATIONS POLISHES PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FORIMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILARMATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITHPERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR THEIR PREPARATION OR CHEMICAL WORKING-UP TRANSPORTING USE OF MATERIALS THEREFOR WOODSTAINS WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL
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Beschreibung
Zusammenfassung:	A process for preparing a modified wood comprising the steps of a) resin treatment of solid wood having a moisture content of at least 10%; resin solution comprises phenol formaldehyde, phenol urea formaldehyde, lignin, tannin or a mixture thereof, followed by b) a thermal modification step wherein curing and crosslinking of the resin takes place in an oxygen-free environment where the wood is heated at a temperature of from 160°C to 230°C at atmospheric pressure or at a temperature of from 120°C to 230°C at a pressure higher than atmospheric pressure; where the wood is first heated to a consistent temperature throughout the cross section of the wood; followed by a rapid cooling to create a temperature gradient whereby the core of the wood has a higher temperature than the surface. The invention gives a modified wood product having improved properties such as higher stability, surface hardness and biological stability.