EP2208594A1 - Method for manufacturing a fire retardant wooden work surface - Google Patents

Method for manufacturing a fire retardant wooden work surface Download PDF

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Publication number
EP2208594A1
EP2208594A1 EP09176759A EP09176759A EP2208594A1 EP 2208594 A1 EP2208594 A1 EP 2208594A1 EP 09176759 A EP09176759 A EP 09176759A EP 09176759 A EP09176759 A EP 09176759A EP 2208594 A1 EP2208594 A1 EP 2208594A1
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Prior art keywords
expandable graphite
wood
mat
mixture
binder
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EP09176759A
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German (de)
French (fr)
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EP2208594B1 (en
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Martin Berger
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Fritz Egger GmbH and Co OG
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Fritz Egger GmbH and Co OG
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Priority to PL09176759T priority Critical patent/PL2208594T3/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N9/00—Arrangements for fireproofing
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/62—Insulation or other protection; Elements or use of specified material therefor
    • E04B1/92—Protection against other undesired influences or dangers
    • E04B1/94—Protection against other undesired influences or dangers against fire
    • E04B1/941—Building elements specially adapted therefor
    • E04B1/942—Building elements specially adapted therefor slab-shaped

Definitions

  • the invention relates to a method for producing a fire-retardant wood-based panel, in particular chipboard, and a wood-based panel produced thereon.
  • Wood-based materials are used in many ways in construction. Where fire protection requirements exist, special precautions are usually required. These can once in the full-surface coating with special fire-retardant paints or planking of wood-based panels with mineral-bonded materials, eg. Plasterboard, exist, or in the choice of an improved with fire retardant wood-based panel itself.
  • flame retardants based on special salts today preferably ammonium phosphates
  • these additives are also disadvantageously expensive and further have the disadvantage that they stick in contact with the pressing tools this glue or form caking on these. Accordingly, these can be added only in the middle layer or it is the chip cake on top and bottom with an additional layer, for example. From grinding dust, provided, which must then be removed from the finished plate again.
  • fire-retardant equipped plates can not be produced to date. This is especially true for thin plates, since these are usually constructed in a single layer.
  • expanded graphite is also known as a fire-retardant agent, which in the event of a fire, that is to say in the event of severe heating, has the properties of reducing the thermal conductivity and of providing a flame retardant.
  • Graphite is a crystalline form of carbon, comprising atoms that are bound in flat layered planes with weaker bonds between the planes.
  • graphite particles such as natural graphite flakes
  • an intercalate of, for example, one Solution of sulfuric and nitric acid reacts the crystal structure of the graphite so that a compound of graphite and the intercalate is formed.
  • the treated intercalated graphite particles are known as expanded graphite particles and are commercially available.
  • the particles of the intercalated graphite undergo foaming and expand in size by a multiple, well up to 80 times, of their original volume in the direction perpendicular to the crystalline planes of the graphite.
  • the EP 0 694 372 Bl relates to a three-layer Oriented Strand Board (OSB) in which the strands (wood chips) of the facing layers are treated with expanded graphite as an anti-fire additive, while the middle layer is free of fire retardants.
  • the wood-based panel provided with expanded graphite only in the outer layers is produced by first mixing the strands which are to form the outer layers of the panel with liquid phenolic resin as a binder into a chip cake and then adding expanded graphite to the chip cake in a subsequent step. The resulting mass is formed into a mat of aligned strands and pressed with an expandable graphite-free further mat and finally with an expandable graphite-containing mat to the final OSB plate.
  • the DE 10 2004 017 578 A1 treats a central layer of doors with recesses introduced for decorative purposes, these being superficially provided with a fire-retardant agent, which may contain expandable graphite, to compensate for the cross-sectional weakening present there.
  • an intumescent fire protection plate having a core of a polyurethane and an intumescent mixture containing expandable graphite, and at least one combustible top layer disposed thereon. Since the outer layers of this fire protection plate are free of expandable graphite, there is also no risk of undesired discoloration on materials that come into contact with the plate. Disadvantage, however, is that the outer layers are combustible and thus the wood-based panel is only partially usable as a fire protection board.
  • the invention is therefore based on the object of specifying a method for producing a wood-based panel, with which an optimal fire protection behavior and at the same time a pencil effect reduced to a minimum is ensured.
  • the basic idea of the present invention is therefore first to mix the expandable graphite with one of the two main components of a wood-based panel, that is to say either with the wood particles or with the binder, before the other of the two main components is added to this mixture.
  • the expandable graphite is distributed over the entire cross section of the mat. Expanded graphite can be used to fire-retard the entire cross-section of a slab, especially in areas near the surface.
  • Expanded graphite plates can be coated in any way. There are no restrictions as may be given by a fire-retardant paint. According to a further embodiment of the method according to the invention, therefore, the wood-based panel is provided with a coating which is particularly free of fire retardant agents, in particular free of expandable graphite, is.
  • expanded graphite has little to no negative impact on the mechanical properties of a plate, in particular transverse tensile and bending strength and modulus of elasticity.
  • Expanded graphite is already very effective in small quantities and therefore very economical to use.
  • Expanded graphite is easy to handle and odorless. In his manipulation, no special precautions are required. Expanded graphite is toxicologically harmless and a substance that reacts under the given conditions with potential reactants not or only to a negligible extent, so he does not pollute the environment.
  • the expandable graphite for example, have a carbon content of at least 90%, in particular at least 92% and preferably at least 98%.
  • the ash content in the expandable graphite can be selected such that it is at most 10%, in particular at most 8% and preferably at most 2%.
  • the particle size distribution in the expanded graphite can be chosen such that at least 80% of the grains are larger than 300 ⁇ m. However, cases are also conceivable in which the particle size distribution is selected such that at least 80% of the grains are smaller than 150 ⁇ m.
  • the Expansion based on a temperature of 1000 ° C, may be at least 100 ml / g, in particular at least 250 ml / g and preferably at least 350 ml / g.
  • the starting temperature at which the expansion starts is preferably in a range of 230 to 270 ° C, especially 240 to 260 ° C, and preferably about 250 ° C.
  • the expandable graphite used in the process according to the invention is produced in particular from flake graphite in the form of flakes or powders.
  • Flake graphite is rendered intumescent by an acid treatment. After washing the surface, adjusting the pH and drying, the expandable graphite is ready for use. It consists essentially of crystallized carbon and minor admixtures of natural rock constituents and minerals. There are also residues of the acid treatment, which are integrated in the interior of the flakes.
  • Such produced expanded graphite has a melting and evaporating temperature in the absence of oxygen of about 3600 ° C. The ignition temperature is approx. 600 ° C.
  • the expandable graphite may have a relative density between 2.1 and 2.3 g / cm 3 and / or a bulk density of 0.2 to 1.0 g / cm 3 .
  • the pH of the surface is preferably between 3 and 12.
  • melamine powder is mixed.
  • the melamine powder is preferably mixed into the mixture containing the small-sized material and the expandable graphite.
  • the melamine powder is preferably mixed into the mixture containing the binder and expandable graphite.
  • binders There is no limitation on the applicability of the binders. It is therefore possible to use all of the customary binder types such as UF, MUF, PF, MUPF and mixtures thereof and / or also PMDI glues.
  • the lignocellulose-containing, small-piece material is provided with a moisture content in a range of 2 to 8%, in particular 3 to 7%, preferably 4 to 6%, based on the dry matter of the material , lies. It has proven particularly advantageous if the moisture content of the small-sized material is 5%. Only after the small-piece material has such a moisture, it is mixed according to this embodiment in the first alternative of the method according to the invention with the expandable graphite or in the second alternative of the method according to the invention with the expandable graphite and binder-containing mixture.
  • the proportion of expandable graphite in a range of 2 to 12%, in particular 3 to 8%, preferably 4 to 6%, based on the dry matter of the material is. It has proven particularly advantageous if the proportion of expandable graphite is 5%.
  • expandable graphite in thin plates, ie plates with a thickness of less than 10 mm, preferably less than 5 mm, more preferably less than 3 mm, in particular in thin chip or fiber plates. These can be produced particularly economically with the help of calendering presses.
  • expandable graphite in the production of single-layered plates, since simply the entire cross section of a plate can be equipped fire retardant.
  • the object is finally achieved according to a third teaching of the present invention by a fire-retardant wood-based panel, in particular chipboard or fiberboard, which is produced by a method as described above.
  • a thin chipboard such as Fig. 1 shows, chips to a moisture content of about 5% (based on the dry mass of the chips) dried. To these is added (again based on the dry mass of the chips) 5% expandable graphite until it is evenly distributed in the chip material.
  • the thus pretreated chips are then glued with a commercially available MUPF binder, wherein the metered amount of binder is adjusted such that accounts for about 1,000 kg of dry wood pulp about 220 kg of solid resin.
  • the chips provided with expandable graphite are glued to a chip cake and pressed with a calender press at a temperature of up to 210 ° C.
  • the plate thus obtained is not ground and has a density of about 780 kg / m 3 .
  • a sample of the plate obtained in this way was tested for the determination of the fire behavior, the dripping behavior and the smoke development according to EN 13823 as well as to EN ISO 11925-2.
  • the tested panel was classified as D - s2, d1 with regard to its reaction to fire.
  • a commercially available MUPF binder such as Fig. 2 shows, based on the solid resin content mixed about 25% expandable graphite until it is homogeneously distributed in the binder.
  • the binder chips which were previously dried to a moisture content of about 5% (based on the dry mass of the wood) glued.
  • the amount of binder is chosen such that accounts for about 1,000 kg of dry wood pulp about 220 kg of solid resin.
  • Fig. 3 shows an embodiment of a wood-based panel 1, here a chipboard, which was prepared by one of the methods described above.
  • the wood-based panel 1 contains a lignocellulose-containing, small-sized material 3, expandable graphite 2 and melamine powder 5, wherein this component was mixed with a binder (not shown) and pressed under elevated pressure and elevated temperature.
  • the wood-based panel 1 has Furthermore, a coating 4, which is free of fire retardant agents.

Abstract

The method involves providing lignocelluloses and a small piece material, and blending the lignocelluloses and small piece material with an expandable graphite to a mixture. The mixture is glued with a binding unit, and the glued mixture is distributed to a particular single-mat. The mat is pressed to a wooden plate at elevated pressure and elevated temperature. The mat is formed as a single-layer, and the expandable graphite is distributed over an entire cross section of the mat. The wooden plate is provided with a coating.

Description

Die Erfindung betrifft ein Verfahren zur Herstellung einer brandhemmenden Holzwerkstoffplatte, insbesondere Spanplatte, sowie eine danach hergestellte Holzwerkstoffplatte.The invention relates to a method for producing a fire-retardant wood-based panel, in particular chipboard, and a wood-based panel produced thereon.

An den Brandschutz werden vor allem in öffentlichen Gebäuden oder beim Fahrzeugbau hohe Anforderungen gestellt. Vor allem im Schiffs- und Fahrzeugbau werden geeignete Holzwerkstoffe wegen ihrem geringeren Gewicht Metall vorgezogen.High demands are placed on fire protection, above all in public buildings or in vehicle construction. Particularly in shipbuilding and vehicle construction, suitable wood-based materials are preferred over metal because of their lower weight.

Die Klassifizierung der Brandschutzeigenschaften von Werkstoffen im Bauwesen wurde in Deutschland bisher durch die DIN 4102 geregelt (in Österreich ÖNorm 3800). Im Zuge der europaweiten Harmonisierung ist dafür nun die EN 13501-1 (Brandverhalten) bzw. die EN 13501-2 (Feuerwiderstand) zugrunde zu legen.The classification of the fire protection properties of construction materials in Germany has hitherto been regulated by DIN 4102 (in Austria ÖNorm 3800). In the course of Europe-wide harmonization, the basis for this is now EN 13501-1 (fire behavior) or EN 13501-2 (fire resistance).

Holzwerkstoffe werden vielseitig im Bauwesen eingesetzt. Wo Anforderungen hinsichtlich Brandschutz bestehen, sind in der Regel besondere Vorkehrungen zu treffen. Diese können einmal in der vollflächigen Beschichtung mit speziellen brandhemmenden Anstrichstoffen oder der Beplankung der Holzwerkstoffplatten mit mineralisch gebundenen Werkstoffen, bspw. Gipskartonplatten, bestehen, oder in der Wahl einer mit Brandschutzmitteln verbesserten Holzwerkstoffplatte selber.Wood-based materials are used in many ways in construction. Where fire protection requirements exist, special precautions are usually required. These can once in the full-surface coating with special fire-retardant paints or planking of wood-based panels with mineral-bonded materials, eg. Plasterboard, exist, or in the choice of an improved with fire retardant wood-based panel itself.

Genannte Brandschutzmittel, welche nach dem Stand der Technik eingesetzt werden, weisen jedoch einige Nachteile auf. Bei zement- oder gipsgebundenen Holzspanplatten wird die gewünschte Eigenschaft durch das nicht brennbare mineralische Bindemittel hergestellt. Solche Platten weisen jedoch ein vergleichsweise hohes Gewicht auf und sind in ihrer Herstellung wesentlich teurer.However, said fire retardants which are used in the prior art, have some disadvantages. In cement or gypsum bonded wood chipboard is the desired property produced by the non-combustible mineral binder. However, such plates have a comparatively high weight and are much more expensive to produce.

Alternativ können auch Flammschutzmittel auf Basis spezieller Salze, heute bevorzugt Ammoniumphosphate, eingesetzt werden. Diese Zusätze sind jedoch ebenso nachteilhaft teuer und weisen weiters den Nachteil auf, dass sie bei Kontakt mit den Preßwerkzeugen diese verkleben bzw. Anbackungen an diesen bilden. Entsprechend können diese nur in der Mittelschicht zudosiert werden oder es wird der Spänekuchen an Ober- und Unterseite mit einer zusätzlichen Schicht, bspw. aus Schleifstaub, versehen, die anschließend von der fertigen Platte wieder abgenommen werden muss. Für einschichtig aufgebaute Platten bzw. wo entsprechende Vorrichtungen nicht zur Verfügung stehen, können solcherart brandhemmend ausgerüstete Platten bis dato nicht hergestellt werden. Dies trifft besonders bei Dünnplatten zu, da diese in der Regel einschichtig aufgebaut sind.Alternatively, flame retardants based on special salts, today preferably ammonium phosphates, can be used. However, these additives are also disadvantageously expensive and further have the disadvantage that they stick in contact with the pressing tools this glue or form caking on these. Accordingly, these can be added only in the middle layer or it is the chip cake on top and bottom with an additional layer, for example. From grinding dust, provided, which must then be removed from the finished plate again. For single-layered plates or where appropriate devices are not available, such fire-retardant equipped plates can not be produced to date. This is especially true for thin plates, since these are usually constructed in a single layer.

Aus dem Stand der Technik ist als brandhemmendes Mittel auch sogenannter Blähgraphit bekannt, der im Brandfall, also bei starker Erwärmung, die Eigenschaften hat, die Wärmeleitfähigkeit zu verringern und eine Entflammungsverzögerung zu schaffen.From the state of the art, so-called expanded graphite is also known as a fire-retardant agent, which in the event of a fire, that is to say in the event of severe heating, has the properties of reducing the thermal conductivity and of providing a flame retardant.

Graphit ist eine kristalline Form von Kohlenstoff, umfassend Atome, die in flachen geschichteten Ebenen mit schwächeren Bindungen zwischen den Ebenen gebunden sind. Durch Behandeln von Graphitteilchen, beispielsweise natürlichen Graphitflocken, mit einem Interkalat von zum Beispiel einer Lösung aus Schwefel- und Stickstoffsäure reagiert die Kristallstruktur des Graphits so, dass eine Verbindung aus Graphit und dem Interkalat gebildet wird. Die behandelten interkalierten Graphitteilchen sind als Teilchen von Blähgraphit bekannt und im Handel erhältlich. Bei Aussetzung einer hohen Temperatur erfahren die Teilchen des interkalierten Graphits ein Aufschäumen und dehnen sich in ihrer Größe'um ein Vielfaches, durchaus bis zum 80-fachen, ihres ursprünglichen Volumens in die Richtung senkrecht zu den kristallinen Ebenen des Graphits aus.Graphite is a crystalline form of carbon, comprising atoms that are bound in flat layered planes with weaker bonds between the planes. By treating graphite particles, such as natural graphite flakes, with an intercalate of, for example, one Solution of sulfuric and nitric acid reacts the crystal structure of the graphite so that a compound of graphite and the intercalate is formed. The treated intercalated graphite particles are known as expanded graphite particles and are commercially available. Upon exposure to a high temperature, the particles of the intercalated graphite undergo foaming and expand in size by a multiple, well up to 80 times, of their original volume in the direction perpendicular to the crystalline planes of the graphite.

Die EP 0 694 372 Bl betrifft eine dreischichtig aufgebaute OSB-Platte (Oriented-Strands-Board), bei der die Strands (Holzspäne) der Deckschichten mit Blähgraphit als brandhemmendem Zusatz behandelt sind, während die Mittelschicht frei von brandhemmenden Mitteln ist. Die ausschließlich in den äußeren Schichten mit Blähgraphit versehene Holzwerkstoffplatte wird hergestellt, indem die Strands, die die äußeren Schichten der Platte bilden sollen, zunächst mit flüssigem Phenolharz als Bindemittel zu einem Spänekuchen vermischt werden und in einem nachfolgenden Schritt dem Spänekuchen Blähgraphit zugegeben wird. Die erhaltene Masse wird zu einer Matte aus ausgerichteten Strands geformt und mit einer Blähgraphit-freien weiteren Matte und schließlich noch einer Blähgraphit enthaltenden Matte zu der endgültigen OSB-Platte verpresst.The EP 0 694 372 Bl relates to a three-layer Oriented Strand Board (OSB) in which the strands (wood chips) of the facing layers are treated with expanded graphite as an anti-fire additive, while the middle layer is free of fire retardants. The wood-based panel provided with expanded graphite only in the outer layers is produced by first mixing the strands which are to form the outer layers of the panel with liquid phenolic resin as a binder into a chip cake and then adding expanded graphite to the chip cake in a subsequent step. The resulting mass is formed into a mat of aligned strands and pressed with an expandable graphite-free further mat and finally with an expandable graphite-containing mat to the final OSB plate.

Die DE 10 2004 017 578 A1 behandelt eine Mittellage von Türen mit zu Dekorationszwecken eingebrachten Vertiefungen, wobei diese zum Ausgleich der dort vorliegenden Querschnittschwächung oberflächlich mit einem brandhemmenden Mittel, das Blähgraphit enthalten kann, versehen sind.The DE 10 2004 017 578 A1 treats a central layer of doors with recesses introduced for decorative purposes, these being superficially provided with a fire-retardant agent, which may contain expandable graphite, to compensate for the cross-sectional weakening present there.

Problematisch bei den zuvor beschriebenen, Blähgraphit enthaltenden Holzwerkstoffplatten ist allerdings, dass neben Graphit auch Blähgraphit die Eigenschaft hat, alles was mit diesem in Kontakt gebracht wird, dunkel einzufärben (Bleistifteffekt). Es herrschen daher auf vielen technischen Gebieten berechtigte Vorbehalte hinsichtlich der Anwendung von Blähgraphit in Holzwerkstoffplatten.The problem with the previously described, expandable graphite-containing wood-based panels, however, is that in addition to graphite and expandable graphite has the property of everything that is brought into contact with this darken (pencil effect). Therefore, there are justified reservations in many technical fields regarding the use of expanded graphite in wood-based panels.

Schließlich ist aus der DE 10 2005 049 788 A1 eine intumeszierende Brandschutzplatte bekannt, die einen Kern aus einem Polyurethan und einem intumeszierenden Gemisch, das Blähgraphit enthält, sowie zumindest eine darauf angeordnete brennbare Deckschicht aufweist. Da bei dieser Brandschutzplatte die äußeren Schichten frei von Blähgraphit sind, besteht hier auch nicht das Risiko unerwünschter Abfärbung auf Materialien, die mit der Platte in Kontakt kommen. Nachteil ist allerdings, dass die Deckschichten brennbar sind und damit die Holzwerkstoffplatte nur bedingt als Brandschutzplatte einsetzbar ist.Finally, out of the DE 10 2005 049 788 A1 an intumescent fire protection plate having a core of a polyurethane and an intumescent mixture containing expandable graphite, and at least one combustible top layer disposed thereon. Since the outer layers of this fire protection plate are free of expandable graphite, there is also no risk of undesired discoloration on materials that come into contact with the plate. Disadvantage, however, is that the outer layers are combustible and thus the wood-based panel is only partially usable as a fire protection board.

Der Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren zur Herstellung einer Holzwerkstoffplatte anzugeben, mit welchem ein optimales Brandschutzverhalten und gleichzeitig ein auf ein Minimum reduzierter Bleistifteffekt gewährleistet wird.The invention is therefore based on the object of specifying a method for producing a wood-based panel, with which an optimal fire protection behavior and at the same time a pencil effect reduced to a minimum is ensured.

Die zuvor hergeleitete und aufgezeigte Aufgabe wird gemäß einer ersten Lehre der vorliegenden Erfindung gelöst durch ein Verfahren zur Herstellung einer brandhemmenden Holzwerkstoffplatte, insbesondere Span- oder Faserplatte, mit den Schritten

  • Bereitstellen von lignozellulosehaltigem, kleinstückigem Material,
  • Vermengen des lignozellulosehaltigen, kleinstückigen Materials mit Blähgraphit zu einem Gemisch,
  • Beleimen des Gemisches mit einem Bindemittel,
  • Streuen des beleimten Gemisches zu einer insbesondere einschichtigen Matte,
  • Verpressen der Matte unter erhöhtem Druck und erhöhter Temperatur zu einer Holzwerkstoffplatte.
The previously derived and pointed out object is achieved according to a first teaching of the present invention by a method for producing a fire-retardant wood-based panel, in particular chipboard or fiberboard, with the steps
  • Providing lignocellulosic, small-piece material,
  • Blending the lignocellulosic, particulate material with expanded graphite into a mixture,
  • Gluing the mixture with a binder,
  • Spreading the glued mixture into a particularly single-layered mat,
  • Pressing the mat under increased pressure and elevated temperature to a wood-based panel.

Ferner wird die Aufgabe gemäß einer zweiten Lehre der vorliegenden Erfindung gelöst durch ein Verfahren zur Herstellung einer brandhemmenden Holzwerkstoffplatte, insbesondere Span- oder Faserplatte, mit den Schritten

  • Bereitstellen von lignozellulosehaltigem, kleinstückigem Material,
  • Vermengen von Bindemittel und Blähgraphit zu einem Gemisch,
  • Beleimen des lignozellulosehaltigen, kleinstückigen Materials mit dem Blähgraphit und Bindemittel enthaltenden Gemisch,
  • Streuen des beleimten Materials zu einer insbesondere einschichtigen Matte,
  • Verpressen der Matte unter erhöhtem Druck und erhöhter Temperatur zu einer Holzwerkstoffplatte.
Furthermore, the object is achieved according to a second teaching of the present invention by a method for producing a fire-retardant wood-based panel, in particular chipboard or fiberboard, with the steps
  • Providing lignocellulosic, small-piece material,
  • Blending binder and expandable graphite into a mixture,
  • Gluing the lignocellulosic, small-piece material with the expandable graphite and binder-containing mixture,
  • Spreading the glued material to a particular single-layer mat,
  • Pressing the mat under increased pressure and elevated temperature to a wood-based panel.

Der Grundgedanke der vorliegenden Erfindung ist also, zunächst den Blähgraphit mit einer der beiden Hauptkomponenten einer Holzwerkstoffplatte, das heißt entweder mit den Holzpartikeln oder mit dem Bindemittel, zu vermischen, bevor die jeweils andere der beiden Hauptkomponenten zu diesem Gemisch hinzugefügt wird.The basic idea of the present invention is therefore first to mix the expandable graphite with one of the two main components of a wood-based panel, that is to say either with the wood particles or with the binder, before the other of the two main components is added to this mixture.

Wie zuvor beschrieben, herrschen auf vielen technischen Gebieten, darunter auf dem technischen Gebiet der Herstellung von Holzwerkstoffplatten, Vorbehalte hinsichtlich der Anwendung von Blähgraphit als brandhemmendes Mittel in Holzwerkstoffplatten, da Blähgraphit einen Bleistifteffekt verursacht.'Entgegen dieser Erwartung hat sich aber gezeigt, dass dann, wenn der Blähgraphit vor dem Beleimen der Späne oder mit dem Bindemittel eingebracht wird, kein Bleistifteffekt resultiert, das ungewünschte Abfärben des Graphit also unterbleibt, da die Blähgraphitteilchen von dem Bindemittel vollständig ummantelt und dadurch eingeschlossen werden können. Weiters entstehen beim Einsatz von Blähgraphit keine ungewünschten Ablagerungen an den Pressblechen.As described above, in many technical fields, including in the field of the manufacture of wood-based panels, there are reservations about the use of expanded graphite as a fire-retardant in wood-based panels, since expanded graphite causes a pencil effect.' Against this expectation, however, it has been found that If the expandable graphite is introduced before the gluing of the chips or with the binder, no penciling effect results, the unwanted discoloration of the graphite is thus omitted, since the expandable graphite particles can be completely encased by the binder and thereby encapsulated. Furthermore, when using expanded graphite no undesirable deposits on the press plates.

Vorteilhafte Ausgestaltungen des erfindungsgemäßen Verfahrens sind Gegenstand der Unteransprüche und werden im Folgenden näher erläutert.Advantageous embodiments of the method according to the invention are the subject of the dependent claims and are explained in more detail below.

Gemäß einer.Ausgestaltung des erfindungsgemäßen Verfahrens wird der Blähgraphit über den gesamten Querschnitt der Matte verteilt. Mit Blähgraphit kann der gesamte Querschnitt einer Platte brandhemmend ausgerüstet werden, also speziell auch in den oberflächennahen Zonen.According to one embodiment of the method according to the invention, the expandable graphite is distributed over the entire cross section of the mat. Expanded graphite can be used to fire-retard the entire cross-section of a slab, especially in areas near the surface.

Mit Blähgraphit ausgerüstete Platten können auf jede Art beschichtet werden. Es bestehen keine Einschränkungen, wie sie durch einen Brandschutzanstrich gegeben sein können. Gemäß einer weiteren Ausgestaltung des erfindungsgemäßen Verfahrens wird daher die Holzwerkstoffplatte mit einer Beschichtung versehen, die insbesondere frei von brandhemmenden Mitteln, insbesondere frei von Blähgraphit, ist.Expanded graphite plates can be coated in any way. There are no restrictions as may be given by a fire-retardant paint. According to a further embodiment of the method according to the invention, therefore, the wood-based panel is provided with a coating which is particularly free of fire retardant agents, in particular free of expandable graphite, is.

Der Einsatz von Blähgraphit hat kaum bis gar keine negativen Einflüsse auf die mechanischen Eigenschaften einer Platte, insbes. Querzug- und Biegefestigkeit sowie E-Modul.The use of expanded graphite has little to no negative impact on the mechanical properties of a plate, in particular transverse tensile and bending strength and modulus of elasticity.

Die mit Blähgraphit ausgerüsteten Platten färben nicht ab, der vermutete Bleistifteffekt tritt wider erwarten nicht auf.The plates equipped with expandable graphite do not discolor, the presumed pencil effect does not occur, contrary to expectation.

Blähgraphit ist bereits in geringen Mengen sehr effektiv und daher in seiner Anwendung sehr wirtschaftlich.Expanded graphite is already very effective in small quantities and therefore very economical to use.

Blähgraphit ist einfach zu handhaben und geruchsneutral. Bei seiner Manipulation sind keine besonderen Vorkehrungen erforderlich. Blähgraphit ist toxikologisch unschädlich und eine Substanz, die unter den jeweilig gegebenen Bedingungen mit potentiellen Reaktionspartnern nicht oder nur in verschwindend geringem Maße reagiert, womit er die Umwelt nicht belastet.Expanded graphite is easy to handle and odorless. In his manipulation, no special precautions are required. Expanded graphite is toxicologically harmless and a substance that reacts under the given conditions with potential reactants not or only to a negligible extent, so he does not pollute the environment.

Es kann Blähgraphit unterschiedlicher technischer Spezifikation eingesetzt werden: der Blähgraphit kann beispielsweise einen Kohlenstoffgehalt von mindestens 90%, insbesondere mindestens 92% und vorzugsweise mindestens 98% aufweisen. Ferner kann der Aschegehalt im Blähgraphit so gewählt sein, dass er bei maximal 10%, insbesondere maximal 8% und vorzugsweise maximal 2% liegt. Die Kornverteilung im Blähgraphit kann so gewählt sein, dass mindestens 80% der Körner größer als 300 µm sind. Es sind aber auch Fälle denkbar, bei denen die Kornverteilung so gewählt ist, dass mindestens 80% der Körner kleiner als 150 µm sind. Die Expansion, bezogen auf eine Temperatur von 1000°C, kann mindestens 100 ml/g, insbesondere mindestens 250 ml/g und vorzugsweise mindestens 350 ml/g betragen. Die Starttemperatur, bei der die Expansion beginnt, liegt vorzugsweise in einem Bereich von 230 bis 270°C, insbesondere von 240 bis 260°C und vorzugsweise bei etwa 250°C.It can be used expandable graphite different technical specification: the expandable graphite, for example, have a carbon content of at least 90%, in particular at least 92% and preferably at least 98%. Furthermore, the ash content in the expandable graphite can be selected such that it is at most 10%, in particular at most 8% and preferably at most 2%. The particle size distribution in the expanded graphite can be chosen such that at least 80% of the grains are larger than 300 μm. However, cases are also conceivable in which the particle size distribution is selected such that at least 80% of the grains are smaller than 150 μm. The Expansion, based on a temperature of 1000 ° C, may be at least 100 ml / g, in particular at least 250 ml / g and preferably at least 350 ml / g. The starting temperature at which the expansion starts is preferably in a range of 230 to 270 ° C, especially 240 to 260 ° C, and preferably about 250 ° C.

Der in dem erfindungsgemäßen Verfahren verwendete Blähgraphit wird insbesondere aus Flockengraphit in Form von Flocken oder Pudern hergestellt. Flockengraphit wird durch eine Säurebehandlung blähfähig gemacht. Nach dem Waschen der Oberfläche, Einstellen des pH-Werts und Trocknen ist der Blähgraphit einsatzbereit. Er besteht im wesentlichen aus kristallisiertem Kohlenstoff und aus geringfügigen Beimengungen von natürlichen Gesteinsbestandteilen und Mineralien. Hinzu kommen noch Reste von der Säurebehandlung, die im Innern der Flocken eingebunden sind. Ein solchermaßen hergestellter Blähgraphit weist eine Schmelz- und Verdampfungstemperatur bei Abwesenheit von Sauerstoff von etwa 3600°C auf. Die Zündtemperatur liegt bei ca. 600°C. Der Blähgrafit kann eine relative Dichte zwischen 2,1 und 2,3 g/cm3 und/oder eine Schüttdichte von 0,2 bis 1,0 g/cm3 aufweisen. Der pH-Wert der Oberfläche liegt vorzugsweise zwischen 3 und 12.The expandable graphite used in the process according to the invention is produced in particular from flake graphite in the form of flakes or powders. Flake graphite is rendered intumescent by an acid treatment. After washing the surface, adjusting the pH and drying, the expandable graphite is ready for use. It consists essentially of crystallized carbon and minor admixtures of natural rock constituents and minerals. There are also residues of the acid treatment, which are integrated in the interior of the flakes. Such produced expanded graphite has a melting and evaporating temperature in the absence of oxygen of about 3600 ° C. The ignition temperature is approx. 600 ° C. The expandable graphite may have a relative density between 2.1 and 2.3 g / cm 3 and / or a bulk density of 0.2 to 1.0 g / cm 3 . The pH of the surface is preferably between 3 and 12.

Zusätzliches Einmischen von Melaminpulver bringt durch Freisetzung des Stickstoffs weitere Verbesserung des Brandverhaltens. Daher ist gemäß einer weiteren Ausgestaltung des erfindungsgemäßen Verfahrens vorgesehen, dass Melaminpulver eingemischt wird. Bei dem Verfahren gemäß der ersten Alternative, bei dem also zunächst das kleinstückige Material mit dem Blähgraphit vermengt wird und das Gemisch anschließend mit einem Bindemittel versehen wird, wird das Melaminpulver vorzugsweise in das das kleinstückige Material und den Blähgraphit enthaltende Gemisch eingemischt. Im Falle der zweiten Alternative des erfindungsgemäßen Verfahrens, bei dem zunächst das Bindemittel mit Blähgrafit versehen wird und anschließend das kleinstückige Material mit diesem Gemisch beleimt wird, wird vorzugsweise das Melaminpulver in das das Bindemittel und den Blähgraphit enthaltende Gemisch eingemischt.Additional mixing of melamine powder brings further improvement of the fire behavior by releasing the nitrogen. Therefore, it is provided according to a further embodiment of the method according to the invention that melamine powder is mixed. In the method according to the first alternative, in which therefore first the small-piece material is mixed with the expandable graphite and the mixture then provided with a binder, the melamine powder is preferably mixed into the mixture containing the small-sized material and the expandable graphite. In the case of the second alternative of the method according to the invention, in which initially the binder is provided with expandable graphite and then the small-piece material is glued with this mixture, the melamine powder is preferably mixed into the mixture containing the binder and expandable graphite.

Es besteht keine Einschränkung hinsichtlich der Anwendbarkeit der Bindemittel. Es können also sämtliche der üblichen Bindemitteltypen wie UF-, MUF-, PF-, MUPF- sowie Mischungen davon und/oder auch PMDI-Leime eingesetzt werden.There is no limitation on the applicability of the binders. It is therefore possible to use all of the customary binder types such as UF, MUF, PF, MUPF and mixtures thereof and / or also PMDI glues.

Gemäß einer weiteren Ausgestaltung des erfindungsgemäßen Verfahrens ist vorgesehen, dass das lignozellulosehaltige, kleinstückige Material mit einer Feuchte bereitgestellt wird, die in einem Bereich von 2 bis 8 %, insbesondere 3 bis 7 %, vorzugsweise 4 bis 6 %, bezogen auf die Trockenmasse des Materials, liegt. Als besonders vorteilhaft hat sich erwiesen, wenn die Feuchte des kleinstückigen Materials 5 % beträgt. Erst nachdem das kleinstückige Material eine solche Feuchte aufweist, wird es gemäß dieser Ausgestaltung bei der ersten Alternative des erfindungsgemäßen Verfahrens mit dem Blähgraphit bzw. bei der zweiten Alternative des erfindungsgemäßen Verfahrens mit dem Blähgraphit und Bindemittel enthaltenden Gemisch vermengt.According to a further embodiment of the method according to the invention, it is provided that the lignocellulose-containing, small-piece material is provided with a moisture content in a range of 2 to 8%, in particular 3 to 7%, preferably 4 to 6%, based on the dry matter of the material , lies. It has proven particularly advantageous if the moisture content of the small-sized material is 5%. Only after the small-piece material has such a moisture, it is mixed according to this embodiment in the first alternative of the method according to the invention with the expandable graphite or in the second alternative of the method according to the invention with the expandable graphite and binder-containing mixture.

Gemäß wiederum einer weiteren Ausgestaltung des erfindungsgemäßen Verfahrens ist vorgesehen, dass der Anteil an Blähgraphit in einem Bereich von 2 bis 12 %, insbesondere 3 bis 8 %, vorzugsweise 4 bis 6 %, bezogen auf die Trockenmasse des Materials, liegt. Besonders vorteilhaft hat sich erwiesen, wenn der Anteil an Blähgraphit 5 % beträgt.According to yet another embodiment of the method according to the invention, it is provided that the proportion of expandable graphite in a range of 2 to 12%, in particular 3 to 8%, preferably 4 to 6%, based on the dry matter of the material is. It has proven particularly advantageous if the proportion of expandable graphite is 5%.

Es sind keine besonderen Vorkehrungen bei der Mischung des Blähgraphit mit dem Bindemittel erforderlich. Ein Absetzen des Blähgraphit im Bindemittel konnte nicht beobachtet werden, entsprechend kann durch einfaches einrühren eine homogene Verteilung des Blähgraphit im Bindemittel erreicht und damit auch eine regelmäßige Verteilung des Blähgraphit in der fertigen Platte erreicht werden.No special precautions are required when mixing the expanded graphite with the binder. Settling of the expandable graphite in the binder could not be observed; accordingly, a homogeneous distribution of the expandable graphite in the binder can be achieved by simply stirring in, and thus a regular distribution of the expandable graphite in the finished plate can be achieved.

Besonders bevorzugt ist der Einsatz des Blähgraphit bei Dünnplatten, also Platten mit einer Dicke kleiner 10 mm, bevorzugt kleiner 5 mm, besonders bevorzugt kleiner 3 mm, insbesondere bei Dünnspan- oder -faserplatten. Diese lassen sich besonders wirtschaftlich mit Hilfe von Kalanderpressen herstellen.Particularly preferred is the use of expandable graphite in thin plates, ie plates with a thickness of less than 10 mm, preferably less than 5 mm, more preferably less than 3 mm, in particular in thin chip or fiber plates. These can be produced particularly economically with the help of calendering presses.

Weiterhin ist es bevorzugt, Blähgraphit bei der Herstellung von einschichtig aufgebauten Platten einzusetzen, da einfach der gesamte Querschnitt einer Platte brandhemmend ausgerüstet werden kann.Furthermore, it is preferred to use expandable graphite in the production of single-layered plates, since simply the entire cross section of a plate can be equipped fire retardant.

Die Aufgabe wird schließlich gemäß einer dritten Lehre der vorliegenden Erfindung gelöst durch eine brandhemmende Holzwerkstoffplatte, insbesondere Span- oder Faserplatte, die durch ein Verfahren hergestellt ist, wie es zuvor beschrieben wurde.The object is finally achieved according to a third teaching of the present invention by a fire-retardant wood-based panel, in particular chipboard or fiberboard, which is produced by a method as described above.

Es gibt nun eine Vielzahl von Möglichkeiten, das erfindungsgemäße Verfahren und die erfindungsgemäße Holzwerkstoffplatte auszugestalten und weiterzubilden. Hierzu sei einerseits verwiesen auf die dem Patentanspruch 1 nachgeordneten Patentansprüche, andererseits auf die Beschreibung von Ausführungsbeispielen in Verbindung mit der Zeichnung. In der Zeichnung zeigt:

Fig. 1
ein erstes Ausführungsbeispiel eines Verfahrens gemäß der vorliegenden Erfindung,
Fig. 2
ein zweites Ausführungsbeispiel eines Verfahrens gemäß der vorliegenden Erfindung und
Fig. 3
eine Schnittansicht einer entsprechenden Holzwerkstoffplatte.
There are now a variety of possibilities, the inventive method and the inventive Design wood board and further educate. For this purpose, reference is made, on the one hand, to the claims subordinate to patent claim 1, and, on the other hand, to the description of exemplary embodiments in conjunction with the drawing. In the drawing shows:
Fig. 1
A first embodiment of a method according to the present invention,
Fig. 2
A second embodiment of a method according to the present invention and
Fig. 3
a sectional view of a corresponding wood-based panel.

Beispiele:Examples: Beispiel 1:Example 1:

Zur Herstellung einer Dünnspanplatte werden, wie Fig. 1 zeigt, Späne auf eine Feuchte von etwa 5 % (bezogen auf die Trockenmasse der Späne) getrocknet. Zu diesen wird (wieder bezogen auf die Trockenmasse der Späne) 5 % Blähgraphit zugemischt, bis dieser gleichmäßig im Spanmaterial verteilt ist. Die so vorbehandelten Späne werden dann mit einem handelsüblichen MUPF-Bindemittel beleimt, wobei die zudosierte Menge an Bindemittel derart eingestellt wird, dass auf je 1.000 kg trockener Holzmasse etwa 220 kg Festharz entfallen. Anschließend werden die mit Blähgraphit versehenen und beleimten Späne zu einem Spänekuchen gestreut und mit einer Kalanderpresse bei einer Temperatur von bis zu 210 °C verpresst. Die so erhaltene Platte wird nicht geschliffen und weist eine Dichte von ca. 780 kg/m3 auf.For producing a thin chipboard, such as Fig. 1 shows, chips to a moisture content of about 5% (based on the dry mass of the chips) dried. To these is added (again based on the dry mass of the chips) 5% expandable graphite until it is evenly distributed in the chip material. The thus pretreated chips are then glued with a commercially available MUPF binder, wherein the metered amount of binder is adjusted such that accounts for about 1,000 kg of dry wood pulp about 220 kg of solid resin. Subsequently, the chips provided with expandable graphite are glued to a chip cake and pressed with a calender press at a temperature of up to 210 ° C. The plate thus obtained is not ground and has a density of about 780 kg / m 3 .

Eine Probe der solcherart erhaltenen Platte wurde zur Bestimmung des Brandverhaltens, des Abtropfverhaltens und der Rauchentwicklung nach EN 13823 sowie nach EN ISO 11925-2 geprüft. In Übereinstimmung mit EN 13501-1 konnte die geprüfte Platte bezüglich seines Brandverhaltens mit D - s2, d1 klassifiziert werden.A sample of the plate obtained in this way was tested for the determination of the fire behavior, the dripping behavior and the smoke development according to EN 13823 as well as to EN ISO 11925-2. In accordance with EN 13501-1, the tested panel was classified as D - s2, d1 with regard to its reaction to fire.

Beispiel 2:Example 2:

Zu einem handelsüblichen MUPF-Bindemittel werden, wie Fig. 2 zeigt, bezogen auf den Festharzgehalt etwa 25 % Blähgraphit gemischt, bis dieses im Bindemittel homogen verteilt ist. Mit dem so aufbereiteten Bindemittel werden Späne, die zuvor auf einen Feuchtegehalt von ca. 5 % getrocknet wurden (bezogen auf die Trockenmasse des Holzes) beleimt. Wiederum wird die Menge an Bindemittel derart gewählt, dass auf je 1.000 kg trockener Holzmasse etwa 220 kg Festharz entfallen.To become a commercially available MUPF binder, such as Fig. 2 shows, based on the solid resin content mixed about 25% expandable graphite until it is homogeneously distributed in the binder. With the thus prepared binder chips, which were previously dried to a moisture content of about 5% (based on the dry mass of the wood) glued. Again, the amount of binder is chosen such that accounts for about 1,000 kg of dry wood pulp about 220 kg of solid resin.

Eine Probe der solcherart hergestellten Platte wurde auf deren Brandverhalten untersucht, wobei gegenüber der Probe aus Beispiel 1 keine veränderten Eigenschaften festgestellt wurden.A sample of the plate prepared in this way was examined for its fire behavior, with no changed properties being found in relation to the sample from Example 1.

Fig. 3 zeigt ein Ausführungsbeispiel einer Holzwerkstoffplatte 1, hier einer Spanplatte, die nach einem der zuvor beschriebenen Verfahren hergestellt wurde. Die Holzwerkstoffplatte 1 enthält ein Lignozellulosehaltiges, kleinstückiges Material 3, Blähgraphit 2 und Melaminpulver 5, wobei diese Bestandteil mit einem Bindemittel (nicht dargestellt) vermengt und unter erhöhtem Druck und erhöhter Temperatur verpresst wurden. Die Holzwerkstoffplatte 1 weist ferner eine Beschichtung 4 auf, die frei von brandhemmenden Mitteln ist. Fig. 3 shows an embodiment of a wood-based panel 1, here a chipboard, which was prepared by one of the methods described above. The wood-based panel 1 contains a lignocellulose-containing, small-sized material 3, expandable graphite 2 and melamine powder 5, wherein this component was mixed with a binder (not shown) and pressed under elevated pressure and elevated temperature. The wood-based panel 1 has Furthermore, a coating 4, which is free of fire retardant agents.

Claims (15)

Verfahren zur Herstellung einer brandhemmenden Holzwerkstoffplatte (1) mit den Schritten - Bereitstellen von lignozellulosehaltigem, kleinstückigem Material (3), - Vermengen des lignozellulosehaltigen, kleinstückigen Materials (3) mit Blähgraphit (2) zu einem Gemisch, - Beleimen des Gemisches mit einem Bindemittel, - Streuen des beleimten Gemisches zu einer insbesondere einschichtigen Matte, - Verpressen der Matte unter erhöhtem Druck und erhöhter Temperatur zu einer Holzwerkstoffplatte (1). Process for producing a fire-retardant wood-based panel (1) comprising the steps Providing lignocellulosic, small-piece material (3), - mixing the lignocellulosic, small-piece material (3) with expandable graphite (2) into a mixture, Gluing the mixture with a binder, Spreading the glued mixture into a particularly single-layered mat, - Pressing the mat under increased pressure and elevated temperature to a wood-based panel (1). Verfahren zur Herstellung einer brandhemmenden Holzwerkstoffplatte (1) mit den Schritten - Bereitstellen von lignozellulosehaltigem, kleinstückigem Material (3), - Vermengen von Bindemittel und Blähgraphit (2) zu einem Gemisch, - Beleimen des lignozellulosehaltigen, kleinstückigen Materials (3) mit dem Blähgraphit (2) und Bindemittel enthaltenden Gemisch, - Streuen des beleimten Materials (3) zu einer insbesondere einschichtigen Matte, - Verpressen der Matte unter erhöhtem Druck und erhöhter Temperatur zu einer Holzwerkstoffplatte (1). Process for producing a fire-retardant wood-based panel (1) comprising the steps Providing lignocellulosic, small-piece material (3), - mixing of binder and expandable graphite (2) into a mixture, Gluing the lignocellulosic, small-piece material (3) with the expandable graphite (2) and binder-containing mixture, Scattering the glued material (3) into a particularly single-layered mat, - Pressing the mat under increased pressure and elevated temperature to a wood-based panel (1). Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Matte einschichtig aufgebaut wird.A method according to claim 1 or 2, characterized in that the mat is constructed in a single layer. Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass der Blähgraphit (2) über den gesamten Querschnitt der Matte verteilt wird.Method according to one of the preceding claims, characterized in that the expandable graphite (2) is distributed over the entire cross section of the mat. Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die Holzwerkstoffplatte (1) mit einer Beschichtung (4) versehen wird.Method according to one of the preceding claims, characterized in that the wood-based material panel (1) is provided with a coating (4). Verfahren nach Anspruch 5, dadurch gekennzeichnet, dass die Beschichtung (4) frei von brandhemmenden Mitteln, insbesondere frei von Blähgraphit (2), ist.A method according to claim 5, characterized in that the coating (4) is free of fire-retardant agents, in particular free of expandable graphite (2). Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass Melaminpulver (5) eingemischt wird.Method according to one of the preceding claims, characterized in that melamine powder (5) is mixed. Verfahren nach Anspruch 7, dadurch gekennzeichnet, dass das Melaminpulver (5) in das das kleinstückige Material (3) und den Blähgraphit (2) enthaltende Gemisch eingemischt wird.A method according to claim 7, characterized in that the melamine powder (5) is mixed into the small-sized material (3) and the expandable graphite (2) containing mixture. Verfahren nach Anspruch 7, dadurch gekennzeichnet, dass das Melaminpulver (5) in das das Bindemittel und den Blähgraphit (2) enthaltende Gemisch eingemischt wird.A method according to claim 7, characterized in that the melamine powder (5) is mixed into the binder and the expandable graphite (2) containing mixture. Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass das Bindemittel aus der Gruppe gewählt ist enthaltend UF-, MUF-, PF-, MUPF-Harze sowie Mischungen davon und/oder PMDI-Leime.Method according to one of the preceding claims, characterized in that the binder is selected from the group comprising UF, MUF, PF, MUPF resins and mixtures thereof and / or PMDI glues. Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass das lignozellulosehaltige, kleinstückige Material (3) mit einer Feuchte in einem Bereich von 2 bis 8 %, insbesondere 3 bis 7 %, vorzugsweise 4 bis 6 %, bezogen auf die Trockenmasse des Materials (3), bereitgestellt wird.Method according to one of the preceding claims, characterized in that the lignocellulose-containing, small-piece material (3) having a moisture in one Range of 2 to 8%, in particular 3 to 7%, preferably 4 to 6%, based on the dry mass of the material (3) is provided. Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass der Anteil an Blähgraphit in einem Bereich von 2 bis 12 %, insbesondere 3 bis 8 %, vorzugsweise 4 bis 6 %, bezogen auf die Trockenmasse des Materials (3), liegt.Method according to one of the preceding claims, characterized in that the proportion of expandable graphite in a range of 2 to 12%, in particular 3 to 8%, preferably 4 to 6%, based on the dry matter of the material (3). Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die Matte zu einer Holzwerkstoffplatte (1) einer Dicke von weniger als 10 mm, insbesondere weniger als 5 mm, vorzugsweise von weniger als 3 mm, gepresst wird.Method according to one of the preceding claims, characterized in that the mat is pressed to a wood-based panel (1) of a thickness of less than 10 mm, in particular less than 5 mm, preferably less than 3 mm. Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die Matte in einer Kalanderpresse zu einer Holzwerkstoffplatte (1) gepresst wird.Method according to one of the preceding claims, characterized in that the mat is pressed in a calender press to a wood-based panel (1). Brandhemmende Holzwerkstoffplatte (1) hergestellt durch ein Verfahren nach einem der vorangehenden Ansprüche.Fire-retardant wood-based panel (1) produced by a method according to one of the preceding claims.
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EP2289677B1 (en) * 2009-08-24 2016-02-10 SWL-Tischlerplatten Betriebs-GmbH Plywood board
US8808850B2 (en) 2011-10-25 2014-08-19 Arclin Water resistant intumescent fire retardant coating
CN103101085A (en) * 2012-12-27 2013-05-15 廊坊华日家具股份有限公司 Mesoporous molecular sieve modified anti-flaming solid wood panels and preparation method thereof
DE102014015354A1 (en) * 2014-10-08 2016-04-14 Ed. Heckewerth Nachf. GmbH & Co. KG paneling
EP3283687A4 (en) * 2015-03-13 2019-06-05 2423465 Ontario Inc. Construction board
DE102015103893B4 (en) * 2015-03-17 2018-02-08 Svt Brandschutz Vertriebsgesellschaft Mbh International Fire protection for wood-based panels
DE102015103893A1 (en) 2015-03-17 2016-09-22 Svt Brandschutz Vertriebsgesellschaft Mbh International Fire protection for wood-based panels
WO2017077069A1 (en) 2015-11-05 2017-05-11 Puren Gmbh Functional material having at least one additive
US10920147B2 (en) 2015-11-12 2021-02-16 Fernando Tahmouresinia Flame or fire retarding agents and their manufacture and use
WO2017118765A1 (en) * 2016-01-09 2017-07-13 Fernando Tahmouresinia Flame or fire protection agent and production and use thereof in particular for wood-, cellulose-, and polyolefin-based products
US10808175B2 (en) 2016-01-09 2020-10-20 Fernando Tahmouresinia Flame or fire protection agent and production and use thereof, in particular for wood-, cellulose- and polyolefin-based products
AU2017205710B2 (en) * 2016-01-09 2021-04-01 Fernando Tahmouresinia Flame or fire protection agent and production and use thereof in particular for wood-, cellulose-, and polyolefin-based products
EP3323576A1 (en) 2016-11-10 2018-05-23 GUTEX Holzfaserplattenwerk H. Henselmann GmbH + Co KG Method for the preparation of fire-retardant insulating panels/mats and fire-retardant injected insulation made from fibres on the basis of renewable resources
EP3323576B1 (en) 2016-11-10 2022-01-26 GUTEX Holzfaserplattenwerk H. Henselmann GmbH + Co KG Method for the preparation of fire-retardant insulating panels/mats on the basis of renewable resources

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ES2491520T3 (en) 2014-09-08
EP2208594B1 (en) 2014-05-21
DE102009005155B4 (en) 2015-12-10
DE102009005155A1 (en) 2010-07-22
PL2208594T3 (en) 2014-10-31

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