Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
  • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
  • B27K5/00—Treating of wood not provided for in groups B27K1/00, B27K3/00
  • B27K5/0085—Thermal treatments, i.e. involving chemical modification of wood at temperatures well over 100°C
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
  • B27D—WORKING VENEER OR PLYWOOD
  • B27D1/00—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
  • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
  • B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
  • B27K3/02—Processes; Apparatus
  • B27K3/15—Impregnating involving polymerisation including use of polymer-containing impregnating agents
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
  • B27M—WORKING OF WOOD NOT PROVIDED FOR IN SUBCLASSES B27B - B27L; MANUFACTURE OF SPECIFIC WOODEN ARTICLES
  • B27M3/00—Manufacture or reconditioning of specific semi-finished or finished articles
  • B27M3/04—Manufacture or reconditioning of specific semi-finished or finished articles of flooring elements, e.g. parqueting blocks
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/31504—Composite [nonstructural laminate]
  • Y10T428/31551—Of polyamidoester [polyurethane, polyisocyanate, polycarbamate, etc.]
  • Y10T428/31591—Next to cellulosic

Definitions

• the present invention relates to a process for the production of wood-based materials which have at least one thin veneer layer adhesively bonded to a carrier or with further fuming layers.
• Wood-based materials with veneer layers made of wood are characterized not only by their aesthetic properties but also by their more homogeneous properties compared to solid wood.
• their low dimensional stability with changing ambient humidities and their low biological resistance prove disadvantageous, so that these materials are generally not weather-resistant.
• the glue joint is heavily stressed by the swelling and shrinkage of the wood in changing weather conditions, so that they lose their mechanical properties after some time, the veneer layers detach from the carrier, or in the case of Fumierverbunden dissolving the composite occurs.
• EP-A 903451 describes the sealing of the edges of engineered parquet panels with a coating based on diphenylmethane diisocyanate. A durable resistance to moisture can not be achieved by these measures.
• WO 2004/033171 describes the impregnation of wood slats for the top layer of engineered parquet with a curable composition which acts as a curable component a modified with methanol and ethylene glycol, 1,3-bis (hydroxymethyl) -4,5-dihydroxyimidazolidin-2-one.
• the lamellae are cured after drying at temperatures of 130 0 C and high pressure. Further processing of the wood slats is not described. The treatment leads to an improved surface hardness of the lamellae thus produced.
• a disadvantage is the reduced elasticity and flexibility of the slats thus produced, which can lead to problems in further processing and damage to the slats.
• the times required for further processing, in particular the pressing time are extended in comparison to untreated veneers.
• the present invention has for its object to provide a process for the production of veneer materials, d. H. of wood-based materials which have at least one surface-bonded thin veneer layer with a support, which leads to wood-based materials with improved weathering stability.
• the process should allow the production of the veneer materials in a simple way.
• the invention therefore relates to a method for producing a wood-based material which has at least one thin veneer layer adhesively bonded to a carrier or to further veneer layers, comprising the following steps:
• Impregnating a veneer with an aqueous curable composition which comprises a) at least one crosslinkable urea compound selected from urea compounds H which is at least one N-linked group of the formula CH 2 OR, where R is hydrogen or CVCMethyl, and / or one of the two nitrogen atoms the urea bridging 1, 2-bishydroxyethane-1, 2-diyl group, precondensates of the urea compound H, and reaction products or mixtures of the urea compound H with at least one alcohol, among C ⁇ Ce alkanols, C 2 -C 6 Polyols and Oligoethylenglykolen is selected, and b) at least one effecting the crosslinking of the urea compound
• Catalyst K contains
• step ii) contains the crosslinkable urea compound substantially uncrosslinked.
• the method according to the invention makes it possible to produce veneer materials in a simple manner. Damage to the veneers occurs in the method according to the invention not or only to a small extent. Another advantage is that the amount of sizing agent for producing a solid composite of the veneer with the carrier can be reduced.
• the method provides veneer materials with improved weathering stability, in particular a reduced shrinkage and swelling behavior with changing ambient humidity. If the impregnated veneer layer forms at least one surface of the veneer material, these surfaces of the resulting materials also have an increased hardness (Brinell hardness).
• the veneer materials according to the invention have an improved resistance to attack by wood-damaging organisms, without the need to use conventional biocides.
• the invention therefore also relates to the wood materials obtainable by the process described here.
• veneer material 1 comprises all wood-based materials which have at least one veneer layer, which veneer layer may be arranged on a carrier, which usually consists of a wood material, or form a composite together with further veneer layers include, for example, veneered panels, eg veneered fibreboard, veneered blockboard, veneered chipboard including veneered OSL and PSL panels (oriented or parallel strand lurnber), plywood, glue wood, laminated wood, laminated veneer lumber (eg ker- Plywood), multiplex panels, laminated veneer lumber (LVL), decorative fumed materials such as cladding, ceiling and engineered parquet panels but also non-planar, three-dimensionally shaped components such as plywood moldings, plywood moldings and any other, with at least one Fumierlage coated moldings.
• veneered panels eg veneered fibreboard, veneered blockboard, veneered chipboard including veneered OSL and PSL panels (oriented or parallel strand lurnber)
• plywood glue wood
• laminated wood laminated veneer
• the method according to the invention is particularly suitable for the production of wood-based materials in which a plurality of modified veneer layers form a composite, for example for the production of plywood, laminated wood, plywood, fumed plywood and molded articles made therefrom.
• the method according to the invention is particularly suitable for the production of wood-based materials which have a veneer layer arranged on a support.
• all conventional veneers made of wood such as knife, peel or saw veneers, including parquet slats, can be used as veneers.
• the thickness of the veneers is usually in the range of 20 microns to 10 mm, often 100 microns to 10 mm and in particular in the range of 0.6 mm to 6 mm.
• a first preferred embodiment of the invention are comparatively thin veneers with thicknesses in the range of 100 microns to 3 mm, in particular in the range of 0.5 mm to 3 mm and especially in the range of 0.6 to 2.5 mm.
• Suitable types of wood for the veneers to be treated according to the invention are basically all types of wood commonly used for veneer production, in particular those which can absorb at least 30%, in particular at least 50%, of their dry weight of water, and particularly preferably those which fall into the saturability classes 1 and 2 according to DIN EN 350-2.
• woods of coniferous trees such as pine (Pinus spp.), Spruce, cedar, stone pine, Douglas fir, larch, pine, fir, coastal fir, and woods of deciduous trees, eg.
• Maple hardmaple, acacia, ayons, birch, pear, beech, oak, alder, aspen, ash, berry, hazel, hornbeam, cherry, chestnut, linden, American walnut, poplar, olive, robinia, elm, walnut, rubber tree , Zebrano, willow and Turkey oak, but also mixed veneers, eg. B. Fine-linen veneers of poplar and Ayons.
• the at least one wood veneer is impregnated with the aqueous, curable composition.
• the impregnation is generally carried out in such a way that the amount of crosslinkable urea compound absorbed by the veneer is in the range from 1 to 100% by weight, frequently from 5 to 80% by weight, in particular from 10 to 70% by weight. , based on the untreated veneer (calculated as Darrtrockenes veneer), lies.
• the moisture of the veneer before impregnation is not critical and can be up to 100%. Often, for practical reasons, the veneer has a moisture content of not more than 80%, or 50%, e.g. 1 to 80%, or 5 to 80% or 5 to 50%.
• the veneer may have been hydrophilized prior to impregnation, for example by dielectric discharge in an oxygen-containing atmosphere analogous to the procedure described in DE-C 199 57 775.
• aqueous compositions of crosslinkable urea compounds used for impregnating in step i) are known per se, for example from the cited WO 2004/033171, as well as from WO 2004/033170, K. Fisher et al. "Textile Auxiliaries - Finishing Agents" Chap. 7.2.2 in Ullmann's Encyclopaedia of Industrial Chemistry, 5th Ed. on CD-ROM, Wiley-VCH, Weinheim 1997 and literature cited there, eg. For example, US 2,731,364, US 2,930,715, and are commonly used as crosslinkers for textile finishing. Reaction products of urea compounds H with alcohols, eg. B.
• urea compounds H and their reaction products and precondensates are commercially available, for example under the trade names Fixapret® CP and Fixapret® ECO from BASF Aktiengesellschaft.
• the urea compounds contained in the aqueous compositions are low molecular weight compounds or oligomers of low molecular weight, which are usually completely dissolved in water.
• the molecular weight of the urea compounds is usually below 400 daltons. These compounds are believed to allow the compounds to penetrate the cell walls of the wood and, upon hardening, improve the mechanical stability of the walls and reduce their swelling caused by water.
• crosslinkable urea compound of the curable, aqueous composition examples include, but are not limited to:
• 1,3-bis (hydroxymethyl) -4,5-dihydroxyimidazoIidin-2-one which is modified with a Ci-C 6 alkanol a C 2 -C 6 -polyol, an oligoethylene glycol (modified DMDHEU or mDMDHEU), 1 , 3-bis (hydroxymethyl) urea, - 1,3-bis (methoxymethyl) urea; 1-hydroxymethyl-3-methylurea,
• Particularly preferred is 3-bis (hydroxymethyl) -4,5-dihyclroxyimidazolicolin-2-one, 1, 3-bis (hydroxymethyl) urea, 1, 3-bis (hydroxymethyl) imidazolidin-2-one, tetra (hydroxymethyl) acetylenediurea and specifically 1, 3-bis (hydroxymethyl-4,5-dihydroxyimidazolidin-2-one (DMDHEU).
• the crosslinkable urea compound is 1,3-bis (hydroxymethyl) -4,5-dihydroxyimidazolidin-2-one and one having a C r C 6 -alkanol a C 2 -C 6 -POIyOl, an oligoethylene glycol-modified 1, 3-bis (hydroxymethyl) -4,5-dihydroxyimidazolidin-2-one selected.
• MDMDHEU are reaction products of
• Suitable polyols are ethylene glycol, diethylene glycol, 1,2- and 1, 3-propylene glycol, 1, 2-, 1, 3, and 1, 4-butylene glycol, glycerol, suitable oligoethylene glycols are in particular those of the formula HO (CH 2 CH 2 O) n H where n is from 2 to 20, of which diethylene glycol and triethylene glycol are preferred
• DMDHEU is mixed with the alkanol, the polyol or the polyethylene glycol, in which case the monohydric alcohol, the polyol or the oligo- or polyethylene glycol are usually used in a ratio of 0.1 to 2.0, in particular 0.2 to 2 Molar equivalents, based on DMDHEU.
• the mixture of DMDHEU, the polyol or the polyethylene glycol wi Rd usually reacted in water at temperatures of preferably 20 to 70 0 C and a pH of preferably 1 to 2.5, wherein the pH after the reaction is generally adjusted to a range of 4 to 8.
• the curable aqueous compositions may contain, in addition to the urea compounds H or their reaction products or precondensates (component a)), one or more of the abovementioned alcohols, C 1 -C 6 -alkyl, C 2 -C 6 -polyamines, oligoethylene glycols or mixtures of these alcohols contained (component c)).
• suitable C 1-6 -alkanols are methanol, ethanol, n-propanol, isopropanol, n-butanol and n-pentanol, preference being given to methanol.
• Suitable polyols are ethylene glycol, diethylene glycol, 1, 2 and 1, 3-propylene glycol, 1, 2, 1, 3, and 1, 4-butylene glycol, glycerol.
• Suitable oligoethylene glycols are especially those of the formula
• n is from 2 to 20, of which diethylene glycol and triethylene glycol are preferred.
• the concentration of urea compound H or its reaction product or precondensate in the aqueous composition is usually in the range from 1 to 80% by weight, frequently in the range from 10 to 60% by weight and in particular in the range from 15 to 50% by weight, based on the total weight of the composition. If the curable, aqueous composition contains one of the abovementioned alcohols, its concentration is preferably in the range from 1 to 50% by weight, in particular in the range from 5 to 40% by weight.
• the total amount of component a) and component c) is usually from 10 to 80 wt .-%, often 10 to 60 wt .-% and in particular 20 to 50 wt .-% of the total weight of the aqueous composition.
• the aqueous composition contains a catalyst K (component b)) which brings about the crosslinking of the urea compound H, or of its reaction product or precondensate.
• a catalyst K component b)
• metal salts suitable as catalysts K are in particular magnesium chloride, magnesium sulfate, zinc chloride, lithium chloride, lithium bromide, aluminum chloride, aluminum sulfate, zinc nitrate and sodium tetrafluoroborate.
• Suitable as catalysts K ammonium salts are in particular ammonium chloride, ammonium sulfate, ammonium oxalate and diammonium phosphate.
• catalysts K are water-soluble organic carboxylic acids such as maleic acid, formic acid, citric acid, tartaric acid and oxalic acid, furthermore benzenesulfonic acids such as p-toluenesulfonic acid, but also inorganic acids such as hydrochloric acid, sulfuric acid, boric acid or mixtures thereof.
• water-soluble organic carboxylic acids such as maleic acid, formic acid, citric acid, tartaric acid and oxalic acid
• benzenesulfonic acids such as p-toluenesulfonic acid
• inorganic acids such as hydrochloric acid, sulfuric acid, boric acid or mixtures thereof.
• the catalyst K is selected from magnesium chloride, zinc chloride, magnesium sulfate, aluminum sulfate or mixtures thereof, magnesium chloride being particularly preferred.
• the catalyst K is usually added to the aqueous composition only shortly before the impregnation of the lignocellulosic material. It is usually used in an amount of 1 to 20 wt .-%, in particular 2 to 10 wt .-%, based on the total weight of the components contained in the curable aqueous composition a) and optionally c).
• the concentration of the catalyst, based on the total weight of the curable, aqueous composition is usually in the range of 0.1 to 10 wt .-% and in particular in the range of 0.5 to 5 wt .-%.
• the aqueous composition used to impregnate the wood fuming may contain some or all of the binder components (sizing ingredients) of the sizing agent used in step ii) for sizing the veneer, as further explained below.
• the composition used in step i) contains at least 50%, in particular at least 80%, and especially the total amount of glue components contained in the sizing composition, based on the total amount of sizing ingredients used in the process.
• glue components and “binder components” are used interchangeably herein and refer to the non-volatile constituents which effect the bonding of the veneer with the carrier, including the excipients and preservatives optionally present in the sizing agent.
• the concentration of binder in the aqueous composition is usually in the range of 0.5 to 25 wt .-%, often in the range of 1 to 20 wt .-% and in particular in the range of 5 to 15 wt .-%, based on the total weight of the aqueous composition. It is assumed that the binder components, unlike the crosslinkable urea compounds, the catalyst K and the optionally present alcohols of component c) are not absorbed or only to a small extent by the cell walls of the Hoiz, but largely on the surface of Holzfumiers remain and therefore in the subsequent bonding process as a sizing agent available.
• the impregnation can usually take place in itself, z.
• immersion by use of vacuum optionally in combination with pressure or by conventional application methods such as brushing, spraying and the like.
• the veneers are immersed in a container containing the aqueous composition.
• the dipping is preferably carried out over a period of a few seconds to 24 h, in particular 1 min to 6 h.
• the temperatures are usually in the range of 15 ° C. to 50 ° C.
• the veneer absorbs the aqueous impregnating composition, wherein the concentration of curable constituents (ie component a) and c)) in the aqueous composition, by the temperature and the Treatment duration can be controlled by the veneer amount of curable ingredients.
• the amount of curable components actually absorbed can be determined and controlled by the skilled person in a simple manner by means of the weight increase of the veneer and the concentration of the aqueous composition.
• the veneers can be pre-pressed by means of press rolls, so-called calenders, which are present in the aqueous impregnating composition.
• calenders which are present in the aqueous impregnating composition.
• the result of relaxing in the wood The resulting vacuum then leads to an accelerated absorption of aqueous impregnating composition.
• the impregnation can also be achieved by using reduced pressure, which may optionally be followed by an elevated pressure phase.
• veneer which generally has a humidity in the range of 1% to 100%, under reduced pressure, which is often in the range of 10 to 500 mbar and in particular in the range of 40 to 100 mbar, in contact with the aqueous composition brought, for. B. by immersion in the curable aqueous composition.
• the time period is usually in the range of 1 minute to 1 hour.
• a phase at elevated pressure, z. B. in the range of 1 to 20 bar, especially in the 5 to 15 bar and especially 10 to 12 bar, to.
• the duration of this phase is usually in the range of 1 min to 12 h.
• the temperatures are usually in the range of 15 to 50 0 C.
• the veneer absorbs the aqueous impregnating composition, wherein by the concentration of curable components in the aqueous composition, by the applied pressure, by the temperature and the treatment time of the Veneer recorded amount of curable ingredients can be controlled.
• the actual amount absorbed can also be calculated here by the weight gain of the veneer.
• the impregnation can be carried out by conventional methods for applying liquids to surfaces, for. B. by spraying or rolling or brushing.
• the application is usually carried out at temperatures in the range of 15 to 50 ° C.
• the concentration of curable constituents in the aqueous composition, the amount applied, the temperature and the duration of the spraying allow the amount of curable constituents taken up by the veneer to be determined can be controlled.
• the amount of curable components actually absorbed results directly from the amount of aqueous composition applied.
• the spraying can be carried out in usually all suitable for the spraying of sheet-like devices devices, for. B. by means of nozzle arrangements and the like.
• brushing or rolling the desired amount of aqueous composition is applied to the veneer using rollers or brushes.
• the veneer is first compressed, then it is brought into contact with the aqueous curable composition.
• the compression can be carried out in a simple manner by means of pressing or in particular by means of press rolls, so-called calenders, which are in the aqueous impregnating composition.
• Compress veneer in a chamber with a conventional, flat press, then flood the chamber with the impregnation solution and then reduce the pressure in the flooded state.
• the compression pressure applied during compression is typically in the range of 1 to 1000 N / cm 2 , often in the range of 10 to 800 N / cm 2 , in particular in the range of 50 to 500 N / cm 2 .
• the vacuum occurring in the wood when relaxing then leads to an accelerated absorption of aqueous impregnating composition.
• the method according to the invention furthermore comprises a gluing step H).
• a liquid gluing composition is applied to the veneer impregnated with the aqueous composition.
• the curable constituents of the aqueous impregnating composition are in substantially uncrosslinked form during the gluing.
• the gluing step ii) therefore takes place immediately after the impregnation step i) or simultaneously with it.
• a drying step may be carried out under conditions in which curing of the constituents contained in the aqueous composition does not take place or only to a very limited extent.
• a temperature of 100 0 C, in particular 80 0 C is not exceeded during such a drying step. If drying is carried out, it will be preferable to fix the veneer in a way, e.g. B. in a press to counteract deformation of the veneer.
• a moisture content of at least 5%, in particular at least 10%, based on the dry mass of the veneer does not fall below in order to prevent premature curing of the aqueous constituents of the composition and to facilitate the further processing.
• the gluing step ii) takes place immediately after the impregnation step i) or particularly preferably simultaneously with it.
• the impregnating solution will already contain the main amount or, in particular, the total amount of binder components of the sizing agent, and the sizing will take place in the manner described for the impregnation.
• the method used in a conventional manner depends on the veneer material to be produced. Methods for this are known to the expert, for. From HH Nimz et al. "Wood - Wood-based Products" 2.2 Laminate Bonding, especially 2.2.2.5 Production of Veneer Plywood in Ullmann's Encyclopaedia of Industrial Chemistry, 5th Edition on CD-ROM, Wiley-VCH (see also F. Kollmann (ed.) Veneers, storage wood and Tischlerplatten, Springer publishing house, Berlin 1962). Examples of gluing methods are the application of the liquid sizing composition by means of rollers, z. B. by 2- or 4-roller assemblies, the infusion of the liquid sizing composition, for. Example by means of a gluing curtain or the melting of the glue composition.
• the veneer material to be produced according to the invention is a material which comprises a plurality of veneer layers glued together, not all of the fuming layers must be glued. As a rule, veneer layers glued on both sides will be glued together with non-glued veneer layers in a layer arrangement, the outer veneer layers generally being un-glued. If the veneer material to be produced according to the invention is a material which comprises a veneer layer glued to a carrier, both the veneer layer and the surface to be bonded of the carrier can be glued.
• sizing compositions customary for the production of veneer materials are suitable as sizing compositions. Preference is given to liquid sizing compositions and in particular to aqueous sizing compositions. Suitable size compositions are known in the art, for. From H. H. Nimz et al. "Wood - Wood-based Products” 2.2.2.4 Adhesives and Additives in Ullmann's Encyclopaedia of Industrial Chemistry, 5th Edition on CD-Rom, Wiley-VCH and A. Pizzi (eds.): Wood Adhesives, Marcel Dekker, New York 1983 ,
• sizing agents are:
• Liquid, in particular aqueous preparations of thermally curable binders such as amino resins, phenolic resins, isocyanate resins and epoxy resins;
• aqueous preparations of film-forming polymers e.g., aqueous polymer dispersions based on styrene acrylates, polyacrylates (acrylic ester / methacrylic acid ester copolymers), vinyl acetate polymers (polyvinyl acetate), styrene-butadiene copolymers and the like.
• Preferred sizing agents are those based on the thermally curable binders mentioned in group i) and mixtures thereof with film-forming polymers of group ii).
• Preferred binders are aminoplast resins, phenolic resins, isocyanate resins and polyvinyl acetate.
• aminoplast resins are formaldehyde condensates of urea (urea-formaldehyde condensates) and of melamine (melamine-formaldehyde condensates). They are available as aqueous solutions or powders under the name voltages Kaurit ® and Kauramin ® (Prod. BASF) and urea-containing and / or melamine-formaldehyde precondensates.
• Typical phenolic resins are phenol-formaldehyde condensates, phenol-resorcinol-formaldehyde condensates and the like. Also suitable are mixed condensates of aminoplast resins and phenolic resins.
• Examples of mixed condensates of aminoplast resins and phenolic resins are urea-melamine-formaldehyde condensates, melamine-urea-formaldehyde-phenol condensates, and mixtures thereof.
• Their preparation and use for the production of moldings from finely divided lignocellulosic materials is well known. Preference is given to urea-formaldehyde resins and, among these, especially those having a molar ratio of 1 mol of urea to 1.1 to 1.4 mol of formaldehyde.
• a transition of soluble and meltable precondensates occurs in infusible and insoluble products.
• curing it is known that continuous cross-linking of the precondensates occurs, which is generally accelerated by hardeners.
• the hardener known to those skilled in the art for urea, phenol and / or melamine-formaldehyde resins can be used, such as acid-reacting and / or acid-releasing compounds, for.
• ammonium or amine salts for example, ammonium or amine salts.
• the proportion of hardener in a glue resin liquor is from 1 to 5% by weight, based on the liquid resin content.
• Methylendiphenylenisocyanaten (MDI) resins are suitable. They usually consist of a mixture of monomeric and oligomeric di- or polyisocyanates, the so-called precondensates, which are capable of reacting with the cellulose, the lignin and the moisture of the lignocellulosic particles.
• Suitable isocyanate resins are for example as Lupra- nat ® grades (from Elastogran) are commercially available.
• Suitable binders of group ii) are, in principle, all water-insoluble polymers which are film-forming and dispersible in water. These include, in particular, emulsion polymers and the powders produced therefrom, as described, for. B. in WO 01/27198 be referred to as polymers A1.
• the polymers often have a glass transition temperature in the range of -20 to +150 0 C and in particular in the range of 0 to +100 0 C.
• these are polyvinyl acetates, copolymers based on styrene / butadiene, based on styrene / acrylic acid alkyl esters and those based on alkyl methacrylate / acrylic acid alkyl ester.
• the application amount of sizing agent depends in a conventional manner on the veneer to be glued and on the type of veneer material to be produced and is typically in the range from 50 to 500 g / m 2 , in particular from 60 to 300 g / m 2 , each glued veneer or 1 to 30 wt .-%, in particular 5 to 25 wt .-%, based on the veneer material and calculated as dry glue (ie, less any solvents and diluents).
• the processing of glued veneer to a wood material is carried out in a conventional manner, for example by surface bonding of the glued veneer with a carrier (or the veneer with the glued carrier), preferably a support made of wood or a wood material, or by gluing two Veneer layers to so-called rinds, or of several, usually 3 to 11, z. B. 3, 5, 7, 9 or 11 veneer layers to a wood material or by combined bonding with a carrier and other veneer layers.
• the carrier is preferably wood or a wood-based material, eg. B. to sawed layers and possibly glued together wood rods to plywood, chipboard, including OSB, LSL and PSL to fiberboard, z.
• the carriers if made of wood, may also be impregnated and cured with the curable aqueous compositions used to impregnate the veneer or not. The preparation of such impregnated wood support materials can be carried out according to the processes described in WO 2004/033170 and WO 2004/033171.
• Wood fiberboard and chipboard used as a support may also be made from wood chip materials impregnated and cured with one (or more) of the curable aqueous composition (s) used to impregnate the veneer.
• a method of manufacturing such plates is the subject of a co-pending patent application.
• the veneer material to be produced according to the invention is a material which comprises a plurality of veneer layers glued together, at least one, preferably several and in particular all veneer layers are provided with an impregnation according to the invention.
• the further processing is typically carried out at elevated temperature to achieve, on the one hand, effective gluing of the glued veneer and, on the other hand, to achieve hardening of the wood-absorbed hardenable constituents of the aqueous impregnating composition.
• the applied temperatures are typically above 100 0 C and below the decomposition temperature of the wood and the glue components, preferably in the range from 110 0 C to 200 0 C and in particular in the range from 120 0 C to 180 0 C.
• further processing by Application of elevated pressure of usually at least 0.1 MPa, z. B. 0.1 to 10 MPa, preferably at least 0.2 MPa, z. B. 0.2 to 8 MPa and in particular at least 0.3 MPa, z. B.
• the times required for bonding depend on the nature of the material to be produced and are typically in the range of 1 minute to 60 minutes. per cm of veneer material thickness, often in the range of 2 min. up to 30 min. per cm veneer material thickness and in particular in the range of 5 to 15 min per cm veneer material thickness.
• the inventive method is basically suitable for the production of all known veneer materials.
• suitable veneer materials are the aforementioned.
• it is veneer materials in which at least one surface, in particular a decorative or weathered surface is formed by a veneer layer treated according to the invention.
• a veneer layer treated according to the invention examples of this are decorative panels for wall and ceiling panels, veneered chip, fiber and plywood panels for the furniture industry and especially engineered parquet.
• the expert understands wood panels with a decorative Deck L. Tread layer of wood veneer lamellae and at least one carrier or base layer, which is usually made of a wood material, for. B. a layer of sawn and optionally glued together wooden rods, plywood, chipboard, including OSB, fiberboard, z. As softboard, MDF or HDF, and the like.
• the Fertigparkettpaneele may also include intermediate layers, which are also typically made of wood or wood-based materials, as well as layers that cause impact sound insulation, as described in EP1364774.
• such panels can also constructive devices that facilitate laying the panels have, for. B. tongue and groove or notches.
• the wood lamellae or veneers of the cover layer i. the wear layer of the parquet
• an impregnation according to the invention Finished parquet panel designs are described, for example, in the article by A. Truscek and Z. Budrovic, "Manufacturing, characteristics and use of pre-finished engineered parquet" in Wood in construction industry: prospectives of reconstruction, International Conference proceedings.
• the wood material is one of two or more, preferably one of an odd number, for. B. 3, 5, 7, 9 or 11, glued together veneer layers existing Holzwerk- fabric, for example a plywood or a plywood, as explained above.
• the individual veneer layers may be identical or different, ie consist of different woods and / or have different thicknesses, and / or contain different amounts of crosslinked urea compound H.
• the preparation is usually carried out by alternately gluing both sides glued and unglued veneer layers in layers and glued together under the above conditions, the outer veneer layers, ie those which form the surface of the veneer material, are unglued.
• a 50 wt% aqueous solution of diethylene glycol and methanol modified (mDMDHEU) was mixed with 1.5 wt% MgCl 2 .6H 2 O.
• Rough hay, lamellae made of beech wood, dried to about 12% wood moisture, with the dimensions 500 mm x 100 mm x 4 mm were placed in an impregnation system.
• the impregnation system was exposed for 30 minutes to a vacuum of 100 mbar and then flooded with the impregnating agent. Subsequently, a pressure of 10 bar was applied for one hour. The printing phase was stopped and the residual liquid was removed.
• the impregnated lamellae of the cover layer were fixed in stacks so that warping was impossible.
• the slats were dried for about 4 days at a temperature of 50 0 C.
• the residual moisture was then at 20%.
• the lamellae thus produced were glued on one side with an aqueous MeI- amine resin preparation in an amount of 200 g / m 2 , based on the non-aqueous portion of the preparation.
• the wooden slat was glued with a fiberboard to a Fertigparkett floorboard. This was done in such a way that the lamella and the fiberboard were placed in a heatable press. The press was heated to 140 ° C. and the blades were pressed at 0.9 N / mm 2 for about 30 minutes.
• a 50% by weight aqueous solution of diethylene glycol and methanol modified (mDMDHEU) was mixed with 1.5% by weight of MgCl 2 .6H 2 O.
• Sawn rough, birch wood veneers dried to approx. 12% moisture content with the dimensions 300 mm x 300 mm x 1.5 mm were placed in an impregnation system.
• the impregnation system was exposed for 30 minutes to a vacuum of 100 mbar and then flooded with the impregnating agent. Subsequently, a pressure of 10 bar was applied for one hour. The printing phase was ended and the residual liquid was removed.
• the impregnated veneers were glued on both sides with an aqueous melamine resin preparation in an amount of 200 g / m 2 , based on the non-aqueous portion of the preparation.
• each 5 veneers were glued to a multiplex board.
• the veneers were placed in a heated press.
• the press was heated to 140 ° C. and the veneers were pressed at 0.8 N / mm 2 for about 15 minutes.

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• Life Sciences & Earth Sciences (AREA)
• Engineering & Computer Science (AREA)
• Wood Science & Technology (AREA)
• Forests & Forestry (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• Mechanical Engineering (AREA)
• Manufacturing & Machinery (AREA)
• Chemical And Physical Treatments For Wood And The Like (AREA)
• Adhesives Or Adhesive Processes (AREA)
• Finished Plywoods (AREA)
• Laminated Bodies (AREA)
• Debarking, Splitting, And Disintegration Of Timber (AREA)
• Dry Formation Of Fiberboard And The Like (AREA)

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• 2005
  • 2005-03-04 DE DE102005010041A patent/DE102005010041A1/de not_active Withdrawn
• 2006
  • 2006-03-03 KR KR1020077022689A patent/KR20080002807A/ko not_active Application Discontinuation
  • 2006-03-03 US US11/817,284 patent/US7976668B2/en not_active Expired - Fee Related
  • 2006-03-03 MX MX2007010430A patent/MX2007010430A/es not_active Application Discontinuation
  • 2006-03-03 AU AU2006219949A patent/AU2006219949B2/en not_active Ceased
  • 2006-03-03 EP EP20060707410 patent/EP1858678B1/fr not_active Not-in-force
  • 2006-03-03 ES ES06707410T patent/ES2354084T3/es active Active
  • 2006-03-03 AT AT06707410T patent/ATE483563T1/de active
  • 2006-03-03 WO PCT/EP2006/001980 patent/WO2006092331A2/fr active Application Filing
  • 2006-03-03 RU RU2007136552/04A patent/RU2007136552A/ru not_active Application Discontinuation
  • 2006-03-03 CA CA 2599209 patent/CA2599209A1/fr not_active Abandoned
  • 2006-03-03 DE DE200650008017 patent/DE502006008017D1/de active Active
  • 2006-03-03 BR BRPI0609033A patent/BRPI0609033A2/pt not_active IP Right Cessation
  • 2006-03-03 CN CN2006800071602A patent/CN101247931B/zh not_active Expired - Fee Related
  • 2006-03-03 JP JP2007557442A patent/JP5150268B2/ja not_active Expired - Fee Related
• 2007
  • 2007-08-21 NO NO20074255A patent/NO20074255L/no not_active Application Discontinuation
  • 2007-10-02 ZA ZA200708404A patent/ZA200708404B/xx unknown

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