EP2272644B1 - Method of reducing the emissions of aldehydes and fleeting organic compounds in wooden materials - Google Patents

Method of reducing the emissions of aldehydes and fleeting organic compounds in wooden materials Download PDF

Info

Publication number
EP2272644B1
EP2272644B1 EP09008805.5A EP09008805A EP2272644B1 EP 2272644 B1 EP2272644 B1 EP 2272644B1 EP 09008805 A EP09008805 A EP 09008805A EP 2272644 B1 EP2272644 B1 EP 2272644B1
Authority
EP
European Patent Office
Prior art keywords
wood
urea
use according
thiosulphate
additive
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP09008805.5A
Other languages
German (de)
French (fr)
Other versions
EP2272644A1 (en
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Swiss Krono Tec AG
Original Assignee
Swiss Krono Tec AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to PT121873855T priority Critical patent/PT2546039E/en
Priority to EP12187385.5A priority patent/EP2546039B1/en
Priority to HUE09008805A priority patent/HUE031829T2/en
Priority to PL12187385T priority patent/PL2546039T3/en
Priority to ES12187385.5T priority patent/ES2468024T3/en
Priority to PT90088055T priority patent/PT2272644T/en
Priority to PL09008805T priority patent/PL2272644T3/en
Priority to EP09008805.5A priority patent/EP2272644B1/en
Application filed by Swiss Krono Tec AG filed Critical Swiss Krono Tec AG
Priority to ES09008805.5T priority patent/ES2611080T3/en
Publication of EP2272644A1 publication Critical patent/EP2272644A1/en
Application granted granted Critical
Publication of EP2272644B1 publication Critical patent/EP2272644B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • B27N1/00—Pretreatment of moulding material
    • B27N1/003—Pretreatment of moulding material for reducing formaldehyde gas emission

Definitions

  • the present invention relates to the use of an additive in a process for producing wood-based materials from lignocellulose-containing comminution products, wherein a reduction of the emission of volatile organic compounds and aldehydes including formaldehyde from wood, the crushed products and the wood-based material produced is achieved. More particularly, the present invention relates to a use of an additive for reducing the emission of volatile organic compounds and aldehydes, including formaldehyde, wherein wood or the lignocellulose shredded products are treated with thiosulfates, preferably a certain combination of compounds of thiosulfates and ureas, to control the emission of these volatiles prevent organic compounds including aldehydes from the wood or the wood-based material produced.
  • the present invention relates to using this additive producible wood materials.
  • the present invention provides the use of treating agents for treating wood or lignocellulosic crushing products and wood-based materials made therefrom which are capable of reducing the emission of aldehydes including formaldehyde and volatile organic compounds and their corresponding use.
  • Lignocellulosic or lignocellulosic materials such as wood and wood pulp products, and derived timber products, such as wood-based panels, include volatile organic compounds (VOCs) and very volatile organic compounds (VVOCs), such as formaldehyde. Volatile organic compounds are subsumed with all volatile organic compounds whose retention time in the gas chromatogram lies between C6 (hexane) and C16 (hexadecane). Among the very volatile organic compounds, among others, formic acid and formaldehyde are counted.
  • aldehydes as used herein includes not only the volatile compounds but also all other aldehydes, especially formaldehyde, unless otherwise specified.
  • Volatile organic compounds and very volatile organic compounds occur depending on the nature and condition of the lignocelluloses, such as the type of wood, the storage period, the storage conditions of the wood or the comminution products of lignocellulose, in different chemical compositions and quantities.
  • the VOCs are derived essentially from extractives of the lignocelluloses, e.g. of wood or conversion products. Prominent representatives of these are substances such as alpha-pinene, beta-pinene, delta-3-carene. Especially in the wood of the conifers, these components are found again. Conversion products, e.g. during storage and processing of the wood and shredded products, e.g. Pentanal and hexanal.
  • softwoods which mainly produce chipboard, medium-density fiberboard (MDF) or OSB boards, contain large quantities of resin and fats which lead to the formation of volatile organic terpene compounds and aldehydes. Some of these substances are also formed by degradation of the main components of the wood, such as lignin, cellulose and hemicellulose. VOCs including aldehydes and formaldehyde may also be formed by the use of certain adhesives for the manufacture of wood-based materials.
  • Adhesives currently used in the manufacture of wood-based materials such as OSB boards, medium density fiberboard, etc. include aminoplast adhesives, such as urea-formaldehyde adhesives (UF adhesives), melamine-urea-phenol-formaldehyde adhesives (MUPF adhesives) or melamine-urea-formaldehyde adhesives (MUF adhesives).
  • aminoplast adhesives such as urea-formaldehyde adhesives (UF adhesives), melamine-urea-phenol-formaldehyde adhesives (MUPF adhesives) or melamine-urea-formaldehyde adhesives (MUF adhesives).
  • Other adhesives typically used in wood-based materials include diisocyanate-based adhesives (PMDI), polyurethane adhesives, phenol-formaldehyde (PF) adhesives, and / or tannin-formaldehyde (TF) adhesives, or mixtures thereof.
  • PMDI diisocyanate-based adhesives
  • VOCs and the formaldehyde take place both during the production of the wood-based materials as well as after their production or in their application.
  • partial chemical degradation of the wood may occur.
  • volatile compounds such as aldehydes and acids, then emit during the later manufacturing process or later use of the produced wood materials. They can also have a negative influence on the bond strength and thus adversely affect the properties of the produced wood materials.
  • the WO 02/072323 describes methods for reducing the emission of formaldehyde from layered products containing at least two layers, wherein the surface of a plate or a veneer is treated with a solution containing sulfite or bisulfite.
  • the examples illustrate that veneer is treated with a sulfite solution to lower formaldehyde emission.
  • From the WO 2007/012350 are known processes for the production of wood-based articles with low emission of chemical compounds, namely low formaldehyde emission when using formaldehyde-containing resins.
  • the treatment of wood chips or wood fibers with bisulfite is proposed.
  • JP -A- 2001164235 Catcher for formaldehyde and process for the treatment of wood panels.
  • the wood materials produced by methods of the prior art show an unsatisfactory VOC and aldehyde emission, especially during prolonged use.
  • the object is achieved by using an additive according to claim 1, wherein a special composition is added to the wood or the lignocellulosic crushing products or the wood-based materials in order, by reaction with the VOCs and the aldehydes, to modify them so that they are no longer from the wood or emit the crushed products or derived from the wood materials produced from the crushed products.
  • the resulting compounds are so high molecular weight that they are no longer volatile and thus no longer contribute in the long term to the VOC emissions or aldehyde emissions including formaldehyde emissions.
  • the addition of the additive may take place before or after the comminution and work-up of the comminuted products, e.g. B. after the refiner in fibers done.
  • the additives can be impregnated into the wood, the lignocellulosic crushing products can be treated with the additives z. B. be impregnated.
  • the application of the additives takes place immediately before the hot pressing or before the dryer.
  • the addition of the adhesive can be carried out before or after the application of the additive.
  • the individual components of the additive can be applied simultaneously or separately. In other words, the additive can be applied in solution to the lignocellulose-containing comminution products by conventional means. Alternatively, the lignocellulose-containing comminution products can be treated individually with the components.
  • the component from the group i) before or after the component from the group ii) are applied separately.
  • This application or treatment can be carried out before or after application of the adhesive.
  • the adhesive can also be effected between the application of a first component of the additive and the second component of the additive.
  • An essential advantage of the present invention is that it is provided in additives which, in a reduction step, reduce aldehydes as well as other volatile organic compounds, in particular those with double bonds, so that the Emission of these VOCs and aldehydes including formaldehyde can also be reduced in the long term and a disruption of the technological process does not occur.
  • thiosulfates in particular the general formula MeS 2 O 3 or Me 2 (S 2 O 3 wherein Me represents an alkali, alkaline earth metal or ammonium
  • the emissions in particular the long-term emission of VOC and aldehydes including formaldehyde made of wood and wood materials can be reduced.
  • the additive thus preferably contains at least one component in each case from the two groups i) and ii).
  • Group i) comprises thiosulfates.
  • they are thiosulfates of the general formula MeS 2 O 3 or Me 2 (S 2 O 3 ), where Me is an alkali metal, alkaline earth metal, or ammonium.
  • Me is an alkali metal, alkaline earth metal, or ammonium.
  • Preferred is the thiosulfate of one of the group of sodium thiosulfate, ammonium thiosulfate, lithium thiosulfate, potassium thiosulfate, calcium thiosulfate, magnesium thiosulfate.
  • the thiosulfate salt used is sodium thiosulfate or ammonium thiosulfate and most preferably ammonium thiosulfate.
  • antioxidant properties can suppress the VOC emission, which are caused for example by oxidation.
  • the resulting from the thiosulfate intermediate Sulfite can z. B. with isolated double bonds, such as those contained in, inter alia, terpenes, fats or fatty acids, by reduction or addition with these compounds.
  • At least one thiosulfate is added to the comminuted products in the use according to the invention.
  • the salts used are preferably ammonium thiosulfate and / or sodium thiosulfate.
  • Group ii) comprises urea and urea derivatives, such as monomethylolurea or methyleneurea. Preference is given to using urea.
  • Urea also reacts with formaldehyde to form mono- and dimethylolurea. This reaction is very slow and thus also allows a long-term lowering of the formaldehyde levels in the wood materials.
  • urea alone is not meaningful because the reaction with formaldehyde is very slow and it is an equilibrium reaction, so that formaldehyde can be released at a later date again.
  • a combination of at least one component of group i) and at least one component from group ii) is used according to the invention for the wood or the comminution products or the wood-based materials. Due to the different reaction modes or reaction times of the added components in relation to formaldehyde and VOC, the long-term emission of VOC and formaldehyde can be very effectively changed, thereby optimizing the properties of the wood-based materials. Furthermore, thiosulfate salts of group i) are suitable for stabilizing ureas of group ii) by preventing urea hydrolysis. Thus, a better effectiveness of group ii) can be assumed.
  • the at least one thiosulfate salt is added in an amount of from 0.1% by weight to 5% by weight, based on atro-lignocellulose. Particular preference is given to amounts of from 0.2% by weight to 1.5% by weight, for. For example, a mixture of about 57% Solids content with 1% dosed on atro wood.
  • the amount of urea is preferably in the range of 0.5% by weight to 5% by weight, based on atorocellulose.
  • the described treatment agents can be used to reduce emissions from wood, lignocellulose-containing crushed products or wood-based materials, eg. B. in the production of wood-based materials are used, wherein the addition is carried out according to the method according to the invention advantageously via standard equipment for binder dosing, such as Beleimtrommel, blow-line gluing or dry gluing.
  • the addition of the solution to the mat via nozzles directly in front of the hot press is possible.
  • the additive is not mixed with the adhesive, but added before or after application of the adhesive crushing products immediately prior to hot pressing. It is not limited only to formaldehyde-containing adhesives, but also extends to all other thermosetting or thermosetting adhesives used in wood-based materials, such as e.g. PMDI.
  • the wood can be impregnated directly with the additives according to the invention. This impregnation can take place before the comminution of the wood; An impregnation after production of the wood material is also possible.
  • VOC volatile organic compounds
  • aldehydes including formaldehyde
  • the thiosulfate salt is those derived from sodium and ammonia.
  • a further preferred embodiment relates to a composition (treating agent) of the abovementioned type in which at least one thiosulfate salt is used in combination with urea and / or urea derivative.
  • the present invention provides wood materials available according to the use of the invention. These wood-based materials are characterized by a reduced emission of volatile organic compounds, in particular the aldehydes including formaldehyde. These are in particular fibreboard, such as HDF or MDF, chipboard or OSB boards.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)

Description

Die vorliegende Erfindung betrifft die Verwendung eines Additivs in einem Verfahren zur Herstellung von Holzwerkstoffen aus lignocellulosehaltigen Zerkleinerungsprodukten, wobei eine Verminderung der Emission von flüchtigen organischen Verbindungen und Aldehyden einschließlich Formaldehyd aus Holz, den Zerkleinerungsprodukten und dem hergestellten Holzwerkstoff erreicht wird. Genauer betrifft die vorliegende Erfindung eine Verwendung eines Additivs zur Verminderung der Emission von flüchtigen organischen Verbindungen und Aldehyden einschließlich Formaldehyd wobei Holz oder die lignocellulosehaltige Zerkleinerungsprodukte mit Thiosulfaten, bevorzugt mit einer bestimmten Kombination von Verbindungen aus Thiosulfaten und Harnstoffen, behandelt werden, um die Emission dieser flüchtigen organischen Verbindungen einschließlich Aldehyden aus dem Holz oder den hergestellten Holzwerkstoff zu verhindern. Weiterhin betrifft die vorliegende Erfindung unter Verwendung dieses Additivs herstellbare Holzwerkstoffe. Insbesondere stellt die vorliegende Erfindung die Verwendung von Behandlungsmitteln zur Behandlung von Holz oder lignocellulosehaltigen Zerkleinerungsprodukten und daraus hergestellten Holzwerkstoffen bereit, die geeignet sind, die Emission von Aldehyden einschließlich Formaldehyd und flüchtigen organischen Verbindungen zu reduzieren und deren entsprechende Verwendung.The present invention relates to the use of an additive in a process for producing wood-based materials from lignocellulose-containing comminution products, wherein a reduction of the emission of volatile organic compounds and aldehydes including formaldehyde from wood, the crushed products and the wood-based material produced is achieved. More particularly, the present invention relates to a use of an additive for reducing the emission of volatile organic compounds and aldehydes, including formaldehyde, wherein wood or the lignocellulose shredded products are treated with thiosulfates, preferably a certain combination of compounds of thiosulfates and ureas, to control the emission of these volatiles prevent organic compounds including aldehydes from the wood or the wood-based material produced. Furthermore, the present invention relates to using this additive producible wood materials. In particular, the present invention provides the use of treating agents for treating wood or lignocellulosic crushing products and wood-based materials made therefrom which are capable of reducing the emission of aldehydes including formaldehyde and volatile organic compounds and their corresponding use.

Stand der TechnikState of the art

Lignocellulose oder lignocellulosehaltige Materialien, wie Holz und Holzzerkleinerungsprodukte und daraus hergestellte Holzwerkstoffe, wie Holzwerkstoffplatten, enthalten unter anderem flüchtige organische Verbindungen (VOC) und sehr flüchtigen organischen Verbindungen (VVOC), wie Formaldehyd. Als flüchtige organische Verbindungen werden alle flüchtigen organischen Stoffe subsumiert, deren Retentionszeit im Gaschromatogramm zwischen C6 (Hexan) und C16 (Hexadecan) liegt. Zu den sehr flüchtigen organischen Verbindungen werden unter anderem auch Ameisensäure und Formaldehyd gezählt. Der Ausdruck Aldehyde, wie er vorliegend verwendet wird, umfasst nicht nur die flüchtigen Verbindungen, sondern auch alle anderen Aldehyde, insbesondere Formaldehyd, wenn nicht anders ausgeführt.Lignocellulosic or lignocellulosic materials, such as wood and wood pulp products, and derived timber products, such as wood-based panels, include volatile organic compounds (VOCs) and very volatile organic compounds (VVOCs), such as formaldehyde. Volatile organic compounds are subsumed with all volatile organic compounds whose retention time in the gas chromatogram lies between C6 (hexane) and C16 (hexadecane). Among the very volatile organic compounds, among others, formic acid and formaldehyde are counted. The term aldehydes as used herein includes not only the volatile compounds but also all other aldehydes, especially formaldehyde, unless otherwise specified.

Flüchtige organische Verbindungen und sehr flüchtige organische Verbindungen kommen in Abhängigkeit von der Art und dem Zustand der Lignocellulosen, wie der Holzart, der Lagerungsdauer, den Lagerungsbedingungen des Holzes bzw. der Zerkleinerungsprodukte der Lignocellulose, in unterschiedlichen chemischen Zusammensetzung und Mengen vor. Die VOCs entstammen dabei im Wesentlichen aus Extraktstoffen der Lignocellulosen, z.B. des Holzes oder Umwandlungsprodukten. Prominente Vertreter hiervon sind Stoffe wie alpha-Pinen, beta-Pinen, delta-3-Caren. Vor allem im Holz der Nadelbäume finden sich diese Bestandteile wieder. Umwandlungsprodukte, die z.B. während der Lagerung und der Bearbeitung des Holzes und der Zerkleinerungsprodukte auftreten, sind z.B. Pentanal und Hexanal. Vor allem Nadelhölzer, aus denen vorwiegend Spanplatten, mitteldichte Faserplatten (MDF) oder OSB-Platten hergestellt werden, enthalten große Mengen Harz und Fette, die zur Bildung von flüchtigen organischen Terpenverbindungen und Aldehyden führen. Teilweise entstehen diese Stoffe auch durch Abbau der Hauptbestandteile des Holzes, wie Lignin, Cellulose und Hemicellulose. VOCs einschließlich Aldehyde und Formaldehyde können auch bei der Verwendung bestimmter Klebstoffe für die Herstellung der Holzwerkstoffe entstehen.Volatile organic compounds and very volatile organic compounds occur depending on the nature and condition of the lignocelluloses, such as the type of wood, the storage period, the storage conditions of the wood or the comminution products of lignocellulose, in different chemical compositions and quantities. The VOCs are derived essentially from extractives of the lignocelluloses, e.g. of wood or conversion products. Prominent representatives of these are substances such as alpha-pinene, beta-pinene, delta-3-carene. Especially in the wood of the conifers, these components are found again. Conversion products, e.g. during storage and processing of the wood and shredded products, e.g. Pentanal and hexanal. Above all, softwoods, which mainly produce chipboard, medium-density fiberboard (MDF) or OSB boards, contain large quantities of resin and fats which lead to the formation of volatile organic terpene compounds and aldehydes. Some of these substances are also formed by degradation of the main components of the wood, such as lignin, cellulose and hemicellulose. VOCs including aldehydes and formaldehyde may also be formed by the use of certain adhesives for the manufacture of wood-based materials.

Es ist eine allgemein bekannte Tatsache, dass alle Holzwerkstoffe einschließlich Spanplatten, Faserplatten und OSB-Platten sowohl Formaldehyd als auch VOC und Aldehyde an die Raumluft abgeben. Wie bereits erwähnt, werden diese Emissionen sowohl durch einen chemischen Abbau innerhalb des Holzes als auch durch chemischen Abbau der verwendeten formaldehydhaltigen Klebstoffe verursacht. Bei den VOC-Emission liegen dagegen ausschließlich holzbedingte Freisetzungen vor, diese gliedern sich in sogenannte Primäremissionen von leicht flüchtigen Holzinhaltsstoffen, wie Terpenen oder chemischen Abbauprodukten, wie Essigsäure und sogenannten Sekundär- bzw. Tertiäremissionen, z.B. höhere Aldehyde, wie Pentanal oder höhere Carbonsäuren. Diese Abbauprodukte entstehen durch lang andauernde oxidative Prozesse von Holzinhaltsstoffen, wie Fettsäuren, aber auch Lignin, Cellulose und Hemicellulose.It is a well-known fact that all wood-based materials, including chipboard, fiberboard and OSB boards, release both formaldehyde and VOC and aldehydes into the room air. As mentioned above, these emissions are caused by both chemical degradation within the wood and chemical degradation of the formaldehyde-containing adhesives used. By contrast, only wood-related releases are present in the VOC emission, these being subdivided into so-called primary emissions of volatile wood constituents, such as terpenes or chemical degradation products, such as acetic acid and so-called secondary or tertiary emissions, e.g. higher aldehydes, such as pentanal or higher carboxylic acids. These degradation products are caused by long-lasting oxidative processes of wood constituents, such as fatty acids, but also lignin, cellulose and hemicellulose.

Zu den Klebstoffen, wie sie derzeit in der Herstellung von Holzwerkstoffen, wie OSB-Platten, mitteldichte Faserplatten usw. verwendet werden, zählen Aminoplastklebstoffe, wie Harnstoff-Formaldehyd-Klebstoffe (UF-Klebstoffe), Melamin-Harnstoff-Phenol-Formaldehyd-Klebstoffe (MUPF-Klebstoffe) oder Melamin-Harnstoff-Formaldehyd-Klebstoffe (MUF-Klebstoffe). Weitere Klebstoffe, wie sie typischerweise bei Holzwerkstoffen eingesetzt werden, umfassen Klebstoffe auf Basis von Diisocyanaten (PMDI), Polyurethanklebstoffe, Phenol-Formaldehyd-Klebstoffe (PF-Klebstoffe) und/oder Tannin-Formaldehyd-Klebstoffe (TF-Klebstoffe) oder Gemische hiervon. Im Faserplattenbereich finden z.B. hauptsächlich Aminoplast-Klebstoffe Verwendung. Eine Freisetzung der VOCs und des Formaldehyds finden sowohl während der Herstellung der Holzwerkstoffe als auch nach deren Herstellung oder bei ihrer Anwendung statt. Bei der Faserplattenherstellung kann es z.B. bei der thermohydrolytischen Behandlung der lignocellulosehaltigen Materialien zu einem chemischen Teilabbau des Holzes kommen. Die dabei entstehenden, leicht flüchtigen Verbindungen, wie Aldehyde und Säuren, emittieren dann während des späteren Herstellungsverfahrens oder bei späterer Nutzung der hergestellten Holzwerkstoffe. Sie können ebenfalls einen negativen Einfluss auf die Verklebungsfestigkeit haben und somit die Eigenschaften der hergestellten Holzwerkstoffe negativ beeinflussen.Adhesives currently used in the manufacture of wood-based materials such as OSB boards, medium density fiberboard, etc. include aminoplast adhesives, such as urea-formaldehyde adhesives (UF adhesives), melamine-urea-phenol-formaldehyde adhesives (MUPF adhesives) or melamine-urea-formaldehyde adhesives (MUF adhesives). Other adhesives typically used in wood-based materials include diisocyanate-based adhesives (PMDI), polyurethane adhesives, phenol-formaldehyde (PF) adhesives, and / or tannin-formaldehyde (TF) adhesives, or mixtures thereof. In the fibreboard sector, for example, mainly aminoplast adhesives are used. Release of the VOCs and the formaldehyde take place both during the production of the wood-based materials as well as after their production or in their application. In the manufacture of fibreboard, for example, in the case of the thermohydrolytic treatment of the lignocellulose-containing materials, partial chemical degradation of the wood may occur. The resulting, volatile compounds, such as aldehydes and acids, then emit during the later manufacturing process or later use of the produced wood materials. They can also have a negative influence on the bond strength and thus adversely affect the properties of the produced wood materials.

Die WO 02/072323 beschreibt Verfahren zur Verminderung der Formaldehyd Emission aus mindestens zwei Schichten enthaltenen Schichtprodukten, wobei die Oberfläche einer Platte oder eines Furniers mit einer Lösung enthaltend Sulfit bzw. Bisulfit behandelt wird. In den Beispielen wird dargestellt, dass Furnier mit einer Sulfitlösung behandelt wird, um die Formaldehyd Emission zu erniedrigen. Aus der WO 2007/012350 sind Verfahren zur Herstellung von Holzwerkstoffartikeln mit geringer Emission von chemischen Verbindungen, nämlich geringer Formaldehyd-Emission bei Verwendung vom formaldehydhaltigen Harzen bekannt. Hier wird die Behandlung von Holzspänen oder Holzfasern mit Bisulfit vorgeschlagen.The WO 02/072323 describes methods for reducing the emission of formaldehyde from layered products containing at least two layers, wherein the surface of a plate or a veneer is treated with a solution containing sulfite or bisulfite. The examples illustrate that veneer is treated with a sulfite solution to lower formaldehyde emission. From the WO 2007/012350 are known processes for the production of wood-based articles with low emission of chemical compounds, namely low formaldehyde emission when using formaldehyde-containing resins. Here, the treatment of wood chips or wood fibers with bisulfite is proposed.

Aus der DE 10 2007 038 041 A1 sind Verfahren zur Verminderung der Emission von Aldehyden und flüchtigen organischen Verbindungen aus Holzwerkstoffen bekannt, bei denen Sulfit- oder Hydrogensulfitsalze ggf. in Verbindung mit Harnstoff oder Harnstoffderivaten und ggf. in Verbindung mit Alkali-, Erdalkali- oder Ammoniumhydroxide, als Additive eingesetzt werden.From the DE 10 2007 038 041 A1 Methods are known for reducing the emission of aldehydes and volatile organic compounds from wood-based materials, in which sulfite or bisulfite salts are optionally used in conjunction with urea or urea derivatives and optionally in conjunction with alkali, alkaline earth or ammonium hydroxides, as additives.

Die JP -A- 2001164235 Fänger für Formaldehyd und Verfahren zur Behandlung von Holzplatten.The JP -A- 2001164235 Catcher for formaldehyde and process for the treatment of wood panels.

Die mit Verfahren des Standes der Technik hergestellten Holzwerkstoffe zeigen insbesondere bei längerer Nutzung eine unbefriedigende VOC- und Aldehyd-Emission auf.The wood materials produced by methods of the prior art show an unsatisfactory VOC and aldehyde emission, especially during prolonged use.

Es ist eine Aufgabe der vorliegenden Erfindung unter Nutzung chemischer Zusätze die VOC-Emission und bevorzugt auch die Formaldehyd-Emission von Holzwerkstoffen auf ein niedriges Niveau zu begrenzen. Dabei sollte so wenig wie möglich in den technologischen Prozess der Holzwerkstoffherstellung eingegriffen werden, um aufwendige technologische Anpassungen oder Umbaumaßnahmen zu vermeiden. Außerdem muss eine chemische Störung des Prozesses ebenso vermieden werden. Bei Verwendung der üblichen formaldehydhaltigen Klebstoffe findet deren Aushärtung unter hohen Temperaturen und hohem Druck statt. Des Weiteren ist eine Aufgabe der vorliegenden Erfindung, die Emission von Aldehyden und VOC über den gesamten Zeitraum, das heißt während der Herstellung und der späteren, längeren Nutzung der hergestellten Holzwerkstoffe gering zu halten.It is an object of the present invention using chemical additives to limit the VOC emission and preferably also the formaldehyde emission of wood-based materials to a low level. In doing so, as little as possible should be intervened in the technological process of wood-based material production in order to avoid costly technological adjustments or conversion measures. In addition, a chemical disturbance of the process must also be avoided. When using the usual formaldehyde-containing adhesives whose curing takes place under high temperatures and high pressure. Furthermore, it is an object of the present invention to minimize the emission of aldehydes and VOCs over the entire period, that is to say during the production and the later, longer use of the produced wood-based materials.

Beschreibung der ErfindungDescription of the invention

Die Aufgabe wird durch Verwendung eines Additivs gemäß Anspruch 1 gelöst, wobei eine spezielle Zusammensetzung dem Holz oder den lignocellulosehaltigen Zerkleinerungsprodukten oder den Holzwerkstoffen zugesetzt wird, um durch Umsetzung mit den VOCs und den Aldehyden, diese so zu verändern, dass sie nicht mehr aus dem Holz oder den Zerkleinerungsprodukten bzw. aus den aus den Zerkleinerungsprodukten hergestellten Holzwerkstoffen emittieren. Die dabei entstehenden Verbindungen sind so hochmolekular, dass sie nicht mehr flüchtig sind und somit nicht mehr auch nicht mehr langfristig zu den VOC-Emissionen bzw. Aldehydemissionen einschließlich Formaldehydemissionen beitragen.The object is achieved by using an additive according to claim 1, wherein a special composition is added to the wood or the lignocellulosic crushing products or the wood-based materials in order, by reaction with the VOCs and the aldehydes, to modify them so that they are no longer from the wood or emit the crushed products or derived from the wood materials produced from the crushed products. The resulting compounds are so high molecular weight that they are no longer volatile and thus no longer contribute in the long term to the VOC emissions or aldehyde emissions including formaldehyde emissions.

Ein Problem bei den Holzwerkstoffen, die aus Holz oder den lignocellulosehaltigen Zerkleinerungsprodukten hergestellt werden, ist insbesondere die Freisetzung der VOC und Aldehyde bei Nutzung. D. h., die Holzwerkstoffe emittieren über einen langen Zeitraum in Holz vorhandene VOC und Aldehyde einschließlich Formaldehyd. Diese entstehen teilweise, wie oben dargelegt, über die Zeit durch chemische Umsetzungen in dem lignocellulosehaltigen Holzwerkstoff. Z. B. können durch Einwirkung von Licht, Sauerstoff, usw. entsprechende Abbauprodukte von Holzinhaltsstoffen, wie Fettsäuren, aber auch Lignin, Cellulose und Hemicellulose, im hergestellten Holzwerkstoff entstehen, die dann als entsprechende Primäremission oder Sekundär- bzw. Tertiäremissionen, wie oben ausgeführt, aus dem Holz emittieren.A problem with the wood materials, which are made of wood or the lignocellulosic crushing products, in particular the release of the VOC and aldehydes when used. That is, the wood-based materials emit VOCs and aldehydes, including formaldehyde, in wood over a long period of time. These arise in part, as stated above, over time by chemical reactions in the lignocellulose-containing wood material. For example, by the action of light, oxygen, etc. corresponding degradation products of wood ingredients, such as fatty acids, but also lignin, cellulose and hemicellulose arise in the produced wood material, which then as the corresponding primary emission or secondary or tertiary emissions, as stated above, from the Emit wood.

Vorliegend wurde gefunden, dass bei Zugabe von mindestens zwei Komponenten, die aus zwei voneinander unterschiedlichen Gruppen i) bis ii), wie unten ausgeführt, ausgewählt sind, die beschriebenen Nachteile verringert bzw. begrenzt sind.In the present case, it has been found that when adding at least two components which are selected from two different groups i) to ii), as explained below, the disadvantages described are reduced or limited.

Die Zugabe des Additivs kann vor oder nach dem Zerkleinern und Aufarbeiten der Zerkleinerungsprodukte, z. B. nach dem Refiner bei Fasern, erfolgen. Die Additive können dabei in das Holz imprägniert werden, die lignocellulosehaltigen Zerkleinerungsprodukte können mit den Additiven behandelt z. B. imprägniert werden. Bevorzugt erfolgt das Aufbringen der Additive unmittelbar vor dem Heißpressen oder vor dem Trockner. Die Zugabe des Klebstoffs kann dabei vor oder nach dem Aufbringen des Additivs erfolgen. Die einzelnen Komponenten des Additivs können dabei gleichzeitig oder getrennt voneinander aufgebracht werden. D. h., das Additiv kann in einer Lösung vorliegend auf die lignocellulosehaltigen Zerkleinerungsprodukte mit üblichen Maßnahmen aufgebracht werden. Alternativ können die lignocellulosehaltigen Zerkleinerungsprodukte mit den Komponenten einzeln behandelt werden. So kann z. B. in der bevorzugten Ausführungsform bei der Verwendung einer Kombination von Thiosulfat und Harnstoff bzw. deren Derivate die Komponente aus der Gruppe i) vor oder nach der Komponente aus der Gruppe ii) separat aufgebracht werden. Dieses Aufbringen bzw. Behandeln kann dabei vor oder nach Aufbringung des Klebstoffes erfolgen. Der Klebstoff kann auch zwischen dem Aufbringen einer ersten Komponente des Additivs und der zweiten Komponente des Additivs erfolgen.The addition of the additive may take place before or after the comminution and work-up of the comminuted products, e.g. B. after the refiner in fibers done. The additives can be impregnated into the wood, the lignocellulosic crushing products can be treated with the additives z. B. be impregnated. Preferably, the application of the additives takes place immediately before the hot pressing or before the dryer. The addition of the adhesive can be carried out before or after the application of the additive. The individual components of the additive can be applied simultaneously or separately. In other words, the additive can be applied in solution to the lignocellulose-containing comminution products by conventional means. Alternatively, the lignocellulose-containing comminution products can be treated individually with the components. So z. B. in the preferred embodiment, when using a combination of thiosulfate and urea or their derivatives, the component from the group i) before or after the component from the group ii) are applied separately. This application or treatment can be carried out before or after application of the adhesive. The adhesive can also be effected between the application of a first component of the additive and the second component of the additive.

Ein wesentlicher Vorteil der vorliegenden Erfindung ist dabei in Bereitstellung in Additiven, die in einem Reduktionsschritt Aldehyde aber auch andere flüchtige organische Verbindungen, insbesondere solche mit Doppelbindungen, reduzieren, so dass die Emission von diesen VOC und Aldehyden einschließlich Formaldehyd auch langfristig verringert werden und eine Störung des technologischen Ablaufs nicht eintritt.An essential advantage of the present invention is that it is provided in additives which, in a reduction step, reduce aldehydes as well as other volatile organic compounds, in particular those with double bonds, so that the Emission of these VOCs and aldehydes including formaldehyde can also be reduced in the long term and a disruption of the technological process does not occur.

Erfindungsgemäß zeigte sich, dass bei Einsatz von Thiosulfaten, insbesondere der allgemeinen Formel MeS2O3 oder Me2(S2O3 wobei Me ein Alkali-, Erdalkalimetall oder Ammonium darstellt, die Emissionen, insbesondere die Langzeitemission, von VOC und Aldehyden einschließlich Formaldehyd aus Holz und Holzwerkstoffen verringert werden kann.According to the invention, it has been found that when using thiosulfates, in particular the general formula MeS 2 O 3 or Me 2 (S 2 O 3 wherein Me represents an alkali, alkaline earth metal or ammonium, the emissions, in particular the long-term emission of VOC and aldehydes including formaldehyde made of wood and wood materials can be reduced.

Bevorzugt können durch Kombination von mindestens zwei Komponenten, die aus zwei voneinander unterschiedlichen Gruppen i) und ii) ausgewählt sind, diese Probleme insbesondere im Langzeitbereich verringert werden. Bevorzugt beinhaltet das Additiv also mindestens jeweils eine Komponente aus den beiden Gruppen i) und ii).Preferably, by combining at least two components selected from two different groups i) and ii), these problems can be reduced, especially in the long-term range. The additive thus preferably contains at least one component in each case from the two groups i) and ii).

Die Gruppe i) umfasst Thiosulfate. Insbesondere handelt es sich um Thiosulfate der allgemeinen Formel MeS2O3 oder Me2(S2O3), wobei Me ein Alkali-, Erdalkalimetall, oder Ammonium darstellt. Bevorzug ist das Thiosulfat eines aus der Gruppe Natriumthiosulfat, Ammoniumthiosulfat, Lithiumthiosulfat, Kaliumthiosulfat, Kalziumthiosulfat, Magnesiumthiosulfat. Insbesondere wird erfindungsgemäß als Thiosulfatsalz Natriumthiosulfat oder Ammoniumthiosulfat und ganz besonders bevorzugt Ammoniumthiosulfat verwendet.Group i) comprises thiosulfates. In particular, they are thiosulfates of the general formula MeS 2 O 3 or Me 2 (S 2 O 3 ), where Me is an alkali metal, alkaline earth metal, or ammonium. Preferred is the thiosulfate of one of the group of sodium thiosulfate, ammonium thiosulfate, lithium thiosulfate, potassium thiosulfate, calcium thiosulfate, magnesium thiosulfate. In particular, according to the invention, the thiosulfate salt used is sodium thiosulfate or ammonium thiosulfate and most preferably ammonium thiosulfate.

Im Gegensatz zu den z. B. in der WO 2009/021702 A1 beschriebenen Verwendung von Sulfit/Hydrogensulfit-Verbindungen setzen sich die Komponenten der Thiosulfate nicht schnell mit Aldehydverbindungen, wie Formaldehyd, unter Bildung von z. B. schwer löslichen Additionsverbindungen um. Im Gegenteil, die Umsetzung erfolgt erst mit einer Zeitverzögerung. Das Thiosulfat wird in einem ersten Schritt oxidiert, wobei Sulfit als Zwischenprodukt und Sulfat als ein Produkt entsteht. Entsprechend kann langfristig ein Umsetzungspartner für im Holz und Holzwerkstoff entstehenden Aldehyden und flüchtigen organischen Verbindungen bereitgestellt werden. Dadurch ist es möglich sehr effektiv und langfristig die Emissionen aus diesen Hölzern und Holzwerkstoffen zu senken. Außerdem haben die genannten Komponenten antioxidative Eigenschaften und können somit die VOC-Emission, die z.B. durch Oxidation verursacht werden, unterdrücken. Das aus dem Thiosulfat entstehende Zwischenprodukt Sulfit kann z. B. mit isolierten Doppelbindungen, wie sie unter anderem in Terpenen, Fetten oder Fettsäuren enthalten sind, durch Reduktion bzw. Addition mit diesen Verbindungen reagieren.In contrast to the z. B. in the WO 2009/021702 A1 described use of sulfite / bisulfite compounds, the components of the thiosulfates do not settle quickly with aldehyde compounds, such as formaldehyde, with the formation of z. B. poorly soluble addition compounds. On the contrary, the implementation takes place only with a time delay. The thiosulfate is oxidized in a first step to produce sulfite as an intermediate and sulfate as a product. Accordingly, an implementation partner for aldehydes and volatile organic compounds arising in the wood and wood-based material can be provided in the long term. This makes it possible to reduce emissions from these woods and wooden materials very effectively and in the long term. In addition, the components mentioned antioxidant properties and thus can suppress the VOC emission, which are caused for example by oxidation. The resulting from the thiosulfate intermediate Sulfite can z. B. with isolated double bonds, such as those contained in, inter alia, terpenes, fats or fatty acids, by reduction or addition with these compounds.

In einer bevorzugten Ausführungsform wird bei der erfindungsgemäßen Verwendung mindestens ein Thiosulfat den Zerkleinerungsprodukten zugesetzt. Bevorzugt handelt es sich bei den dabei verwendeten Salzen um Ammoniumthiosulfat und/oder Natriumthiosulfat.In a preferred embodiment, at least one thiosulfate is added to the comminuted products in the use according to the invention. The salts used are preferably ammonium thiosulfate and / or sodium thiosulfate.

Die Gruppe ii) umfasst Harnstoff und Harnstoffderivate, wie Monomethylolharnstoff oder Methylenharnstoff. Bevorzugt wird Harnstoff eingesetzt.Group ii) comprises urea and urea derivatives, such as monomethylolurea or methyleneurea. Preference is given to using urea.

Harnstoff reagiert ebenfalls mit Formaldehyd unter Bildung von Mono- und Dimethylolharnstoff. Diese Umsetzung geschieht sehr langsam und erlaubt somit ebenfalls ein langfristiges Absenken des Formaldehydniveaus in den Holzwerkstoffen. Die Verwendung von Harnstoff alleine ist aber nicht sinnvoll, da die Umsetzung mit Formaldehyd sehr langsam erfolgt und es sich um eine Gleichgewichtsreaktion handelt, so dass Formaldehyd zu einem späteren Zeitpunkt auch wieder abgegeben werden kann.Urea also reacts with formaldehyde to form mono- and dimethylolurea. This reaction is very slow and thus also allows a long-term lowering of the formaldehyde levels in the wood materials. However, the use of urea alone is not meaningful because the reaction with formaldehyde is very slow and it is an equilibrium reaction, so that formaldehyde can be released at a later date again.

In einer bevorzugten Ausführungsform der vorliegenden Erfindung wird eine Kombination aus mindestens einer Komponente der Gruppe i) und mindestens einer Komponente aus der Gruppe ii) dem Holz oder den Zerkleinerungsprodukten oder den Holzwerkstoffen erfindungsgemäß verwendet. Aufgrund der unterschiedlichen Reaktionsweisen bzw. Reaktionszeiten der zugefügten Komponenten in Bezug auf Formaldehyd und VOC kann sehr effektiv die langfristige Emission von VOC und Formaldehyd verändert und dadurch die Eigenschaften der Holzwerkstoffe optimiert werden. Des weiteren sind Thiosulfatsalze der Gruppe i) dazu geeignet, Harnstoffe der Gruppe ii) zu stabilisieren, indem die Harnstoffhydrolyse verhindert wird. Somit kann von einer besseren Wirksamkeit der Gruppe ii) ausgegangen werden.In a preferred embodiment of the present invention, a combination of at least one component of group i) and at least one component from group ii) is used according to the invention for the wood or the comminution products or the wood-based materials. Due to the different reaction modes or reaction times of the added components in relation to formaldehyde and VOC, the long-term emission of VOC and formaldehyde can be very effectively changed, thereby optimizing the properties of the wood-based materials. Furthermore, thiosulfate salts of group i) are suitable for stabilizing ureas of group ii) by preventing urea hydrolysis. Thus, a better effectiveness of group ii) can be assumed.

Bevorzugt wird das mindestens ein Thiosulfatsalz in einer Menge von 0,1 Gew.-% bis 5 Gew.-% bezogen auf atro Lignocellulose zugesetzt. Besonders bevorzugt werden Mengen von jeweils 0,2 Gew.-% bis 1,5 Gew.-%, z. B. eine Mischung mit ca. 57 % Feststoffgehalt mit 1 % auf atro Holz dosiert. Die Menge an Harnstoff liegt bevorzugt mit Bereich von 0,5 Gew.-% bis 5 Gew.-% bezogen auf atro Lignocellulose.Preferably, the at least one thiosulfate salt is added in an amount of from 0.1% by weight to 5% by weight, based on atro-lignocellulose. Particular preference is given to amounts of from 0.2% by weight to 1.5% by weight, for. For example, a mixture of about 57% Solids content with 1% dosed on atro wood. The amount of urea is preferably in the range of 0.5% by weight to 5% by weight, based on atorocellulose.

Die beschriebenen Behandlungsmittel können zur Verringerung der Emissionen aus Holz, lignocellulosehaltigen Zerkleinerungsprodukten oder Holzwerkstoffen, z. B. bei der Herstellung von Holzwerkstoffen zum Einsatz kommen, wobei die Zugabe gemäß dem erfindungsgemäßen Verfahren zweckmäßigerweise über betriebsübliche Anlagen zur Bindemitteldosierung, wie Beleimtrommel, Blow-Line-Beleimung oder Trockenbeleimung erfolgt. Weiterhin ist erfindungsgemäß die Zugabe der Lösung zur Matte über Düsen direkt vor der Heißpresse möglich. Bevorzugt wird das Additiv nicht mit dem Klebstoff vermischt, sondern vor oder nach Aufbringen des Klebstoffs den Zerkleinerungsprodukten unmittelbar vor dem Heißpressen zugesetzt. Dabei ist es nicht nur auf formaldehydhaltige Klebstoffe beschränkt, sondern erstreckt sich auch auf alle anderen thermo- oder duroplastischen Klebstoffe, die bei Holzwerkstoffen zum Einsatz kommen, wie z.B. PMDI.The described treatment agents can be used to reduce emissions from wood, lignocellulose-containing crushed products or wood-based materials, eg. B. in the production of wood-based materials are used, wherein the addition is carried out according to the method according to the invention advantageously via standard equipment for binder dosing, such as Beleimtrommel, blow-line gluing or dry gluing. Furthermore, according to the invention, the addition of the solution to the mat via nozzles directly in front of the hot press is possible. Preferably, the additive is not mixed with the adhesive, but added before or after application of the adhesive crushing products immediately prior to hot pressing. It is not limited only to formaldehyde-containing adhesives, but also extends to all other thermosetting or thermosetting adhesives used in wood-based materials, such as e.g. PMDI.

Alternativ kann aber auch das Holz direkt mit den erfindungsgemäßen Additiven imprägniert werden. Diese Imprägnierung kann vor der Zerkleinerung des Holzes erfolgen; eine Imprägnierung nach Herstellung des Holzwerkstoffes ist aber ebenfalls möglich.Alternatively, however, the wood can be impregnated directly with the additives according to the invention. This impregnation can take place before the comminution of the wood; An impregnation after production of the wood material is also possible.

Besonders bevorzugt ist eine Zusammensetzung enthaltend

  • 0 bis 90 Gew.-% Ammoniumthiosulfat
  • 0 bis 90 Gew.-% Natriumthiosulfat
  • 0 bis 90 Gew.-% Harnstoff
wobei jeweils Komponenten aus den Gruppen i) und ii) in einer Menge von mindestens 0,1 Gew.-% vorhanden sind.Particularly preferred is a composition containing
  • 0 to 90 wt .-% ammonium thiosulfate
  • 0 to 90% by weight of sodium thiosulfate
  • 0 to 90 wt .-% urea
wherein in each case components from groups i) and ii) are present in an amount of at least 0.1% by weight.

Des Weiteren werden Zusammensetzungen (Behandlungsmittel) zur Behandlung von Holz, lignocellulosehaltigen Zerkleinerungsprodukten und Holzwerkstoffen und zur Reduktion der Emission von flüchtigen organischen Verbindungen (VOC) und Aldehyden, einschließlich Formaldehyd, umfassend mindestens ein i) Thiosulfatsalz, bevorzugt in Kombination mit ii) Harnstoff und Harnstoffderivate beschrieben.Further, compositions (treating agents) for treating wood, lignocellulosic crushing products and wood-based materials and reducing the emission of volatile organic compounds (VOC) and aldehydes, including formaldehyde, comprising at least one i) thiosulfate salt, preferably in combination with ii) urea and urea derivatives described.

Bevorzugt handelt es sich bei dem Thiosulfatsalz um solche abgeleitet von Natrium und Ammoniak.Preferably, the thiosulfate salt is those derived from sodium and ammonia.

Eine weitere bevorzugte Ausführungsform betrifft eine Zusammensetzung (Behandlungsmittel) der oben genannten Art, bei der mindestens ein Thiosulfatsalz in Kombination mit Harnstoff und/oder Harnstoffderivat verwendet wird.A further preferred embodiment relates to a composition (treating agent) of the abovementioned type in which at least one thiosulfate salt is used in combination with urea and / or urea derivative.

Schließlich stellt die vorliegende Erfindung Holzwerkstoffe erhältlich gemäß der erfindungsgemäßen Verwendung bereit. Diese Holzwerkstoffe zeichnen sich durch eine verringerte Emission an flüchtigen organischen Verbindungen insbesondere den Aldehyden einschließlich Formaldehyd aus. Hierbei handelt es sich insbesondere um Faserplatten, wie HDF oder MDF, Spanplatten oder OSB-Platten.Finally, the present invention provides wood materials available according to the use of the invention. These wood-based materials are characterized by a reduced emission of volatile organic compounds, in particular the aldehydes including formaldehyde. These are in particular fibreboard, such as HDF or MDF, chipboard or OSB boards.

Claims (15)

  1. Use of an additive comprising at least one thiosulphate of the general formula MeS2O3 or Me2(S2O3) where Me is an alkali metal or alkaline earth metal or ammonium for reducing the emission of volatile organic compounds whose retention time in a gas chromatogram is between hexane and hexadecane from lignocellulosic comminution products or wood-base materials produced therefrom wherein the wood-base materials are produced by provision of lignocellulosic comminution products, addition of the additive for treating the lignocellulosic comminution products and optional compression moulding of the additive-admixed lignocellulosic comminution products with adhesive under thermal treatment to produce a wood-base material.
  2. Use according to Claim 1, wherein the additive is a combination of two or more components, wherein the first component is at least one from group i) thiosulphates of general formula MeS2O3 or Me2(S2O3), where Me is an alkali or alkali metal or ammonium; and the second component is at least one from group ii) urea and urea derivatives.
  3. Use according to Claim 1 or 2, characterized in that the lignocellulosic comminution products are selected from wood shavings, wood strands and wood fibres.
  4. Use according to any of Claims 1 to 3, wherein the wood-base materials are wood panels.
  5. Use according to Claim 4, wherein the wood panels are particle board, MDF board and OSB panels.
  6. Use according to any preceding claim, characterized in that the thiosulphate of group i) is selected from sodium thiosulphate, ammonium thiosulphate, lithium thiosulphate, potassium thiosulphate, calcium thiosulphate, magnesium thiosulphate or mixtures thereof, in particular sodium thiosulphate or ammonium thiosulphate.
  7. Use according to any of Claims 2 to 6, characterized in that the component from group ii) is urea, or a urea derivative from monomethylolurea, methyleneurea, preferably urea.
  8. Use according to any preceding claim, wherein the amount of thiosulphate is from 0.1 wt% to 5 wt% of solids based on absolutely dry lignocellulose.
  9. Use according to any of Claims 2 to 8, wherein the amount of urea or urea derivative is from 0.1 wt% to 5 wt% of solids based on absolutely dry lignocellulose.
  10. Use according to any of Claims 2 to 9, wherein the components of groups i) and ii) are applied to the lignocellulosic comminution products separately from each other.
  11. Use according to any preceding claim, wherein the additive is admixed to the comminution products before compression moulding but after defibration or chipping.
  12. Use according to any preceding claim, wherein the additive is admixed before or after resinating the defibrated or chipped lignocellulosic comminution products.
  13. Use according to any preceding claim, characterized in that the adhesive used is a phenol-formaldehyde adhesive, an adhesive based on isocyanates (PMDI), a urea-formaldehyde adhesive, a melamine-urea-formaldehyde adhesive, a melamine-urea-phenol-formaldehyde adhesive, a tannin-formaldehyde adhesive or a mixture thereof.
  14. Wood-base material obtainable using an additive according to Claim 4, wherein the material is fibre board, particle board or OSB panels.
  15. Wood-base material according to Claim 14, wherein the fibre board is HDF or MDF board.
EP09008805.5A 2009-07-06 2009-07-06 Method of reducing the emissions of aldehydes and fleeting organic compounds in wooden materials Active EP2272644B1 (en)

Priority Applications (9)

Application Number Priority Date Filing Date Title
HUE09008805A HUE031829T2 (en) 2009-07-06 2009-07-06 Method of reducing the emissions of aldehydes and fleeting organic compounds in wooden materials
PL12187385T PL2546039T3 (en) 2009-07-06 2009-07-06 Method of reducing the emissions of aldehydes and fleeting organic compounds in OSB-boards, use of additives therefore and OSB-board
ES12187385.5T ES2468024T3 (en) 2009-07-06 2009-07-06 Procedure to reduce the emission of aldehydes and volatile organic compounds from osb plates, use of additives for this purpose and OSB plate
PT90088055T PT2272644T (en) 2009-07-06 2009-07-06 Method of reducing the emissions of aldehydes and fleeting organic compounds in wooden materials
PT121873855T PT2546039E (en) 2009-07-06 2009-07-06 Method of reducing the emissions of aldehydes and fleeting organic compounds in osb-boards, use of additives therefore and osb-board
EP09008805.5A EP2272644B1 (en) 2009-07-06 2009-07-06 Method of reducing the emissions of aldehydes and fleeting organic compounds in wooden materials
EP12187385.5A EP2546039B1 (en) 2009-07-06 2009-07-06 Method of reducing the emissions of aldehydes and fleeting organic compounds in OSB-boards, use of additives therefore and OSB-board
ES09008805.5T ES2611080T3 (en) 2009-07-06 2009-07-06 Procedure to reduce the emission of aldehydes and volatile organic compounds from wood-based materials
PL09008805T PL2272644T3 (en) 2009-07-06 2009-07-06 Method of reducing the emissions of aldehydes and fleeting organic compounds in wooden materials

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP09008805.5A EP2272644B1 (en) 2009-07-06 2009-07-06 Method of reducing the emissions of aldehydes and fleeting organic compounds in wooden materials

Related Child Applications (2)

Application Number Title Priority Date Filing Date
EP12187385.5A Division EP2546039B1 (en) 2009-07-06 2009-07-06 Method of reducing the emissions of aldehydes and fleeting organic compounds in OSB-boards, use of additives therefore and OSB-board
EP12187385.5A Division-Into EP2546039B1 (en) 2009-07-06 2009-07-06 Method of reducing the emissions of aldehydes and fleeting organic compounds in OSB-boards, use of additives therefore and OSB-board

Publications (2)

Publication Number Publication Date
EP2272644A1 EP2272644A1 (en) 2011-01-12
EP2272644B1 true EP2272644B1 (en) 2016-10-19

Family

ID=41338621

Family Applications (2)

Application Number Title Priority Date Filing Date
EP09008805.5A Active EP2272644B1 (en) 2009-07-06 2009-07-06 Method of reducing the emissions of aldehydes and fleeting organic compounds in wooden materials
EP12187385.5A Active EP2546039B1 (en) 2009-07-06 2009-07-06 Method of reducing the emissions of aldehydes and fleeting organic compounds in OSB-boards, use of additives therefore and OSB-board

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP12187385.5A Active EP2546039B1 (en) 2009-07-06 2009-07-06 Method of reducing the emissions of aldehydes and fleeting organic compounds in OSB-boards, use of additives therefore and OSB-board

Country Status (5)

Country Link
EP (2) EP2272644B1 (en)
ES (2) ES2468024T3 (en)
HU (1) HUE031829T2 (en)
PL (2) PL2272644T3 (en)
PT (2) PT2272644T (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2111959A2 (en) * 2008-04-24 2009-10-28 Kronotec Ag Method for producing wooden materials and wooden materials

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101214074B1 (en) * 2012-02-27 2012-12-20 백철기 Chemical-free synthetic wood using reed and the method of manufacturing thereof
CN102615690B (en) * 2012-04-12 2014-03-12 文安县天华密度板有限公司 Method for using ammonia gas to fumigate wood fibers to produce environment-friendly artificial boards

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001164235A (en) * 1999-09-30 2001-06-19 Kyokutoo International:Kk Scavenger for formaldehyde, method for treating wooden plate and wooden plate
DK1368168T3 (en) 2001-03-12 2009-02-02 Akzo Nobel Coatings Int Bv Process for reducing the emission of formaldehyde from layered products
WO2006010192A1 (en) * 2004-07-27 2006-02-02 Orica Australia Pty. Ltd. System for providing powder coated reconstituted cellulosic substrate
PL1907178T3 (en) 2005-07-27 2017-01-31 Kronoplus Technical Ag Method for production of wood material articles with low emissions of chemical compounds
DE102007038041A1 (en) 2007-08-10 2009-02-12 Kronotec Ag Method for preventing the emission of aldehydes and volatile organic compounds from wood-based materials

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2111959A2 (en) * 2008-04-24 2009-10-28 Kronotec Ag Method for producing wooden materials and wooden materials

Also Published As

Publication number Publication date
EP2546039B1 (en) 2014-03-26
PL2546039T3 (en) 2014-08-29
ES2468024T3 (en) 2014-06-13
EP2546039A3 (en) 2013-03-20
PL2272644T3 (en) 2017-09-29
PT2546039E (en) 2014-06-09
EP2272644A1 (en) 2011-01-12
ES2611080T3 (en) 2017-05-04
HUE031829T2 (en) 2017-08-28
PT2272644T (en) 2017-01-10
EP2546039A2 (en) 2013-01-16

Similar Documents

Publication Publication Date Title
EP2176354B2 (en) Method for reducing the emission of aldehydes and volatile organic compounds of wood material
DE102006020612B4 (en) Process for the production of wood-based materials with reduced emission of volatile organic compounds, wood-based materials obtainable therewith and the use of certain additives for reducing the release of volatile organic compounds from wood-based materials and wood-pulp products of lignocelluloses
EP2111959A2 (en) Method for producing wooden materials and wooden materials
WO2006039914A1 (en) Method for reducing the release of volatile organic compounds (voc) from wood and wood chip products and wood materials derived therefrom in particular particle boards
EP2272644B1 (en) Method of reducing the emissions of aldehydes and fleeting organic compounds in wooden materials
EP1874513B1 (en) Method for producing reduced-emission, low-thickness swell medium density fiber boards and molded fiber parts
DE102007055415B4 (en) Method for reducing the emission of saturated and unsaturated aldehydes from wood-based materials
EP2193899B1 (en) Method for manufacturing wooden materials made of hackled products containing lignocellulose and such wooden materials
EP3268190B1 (en) Method for producing a wood chip material and curing agents used therein for aminoplasts
EP2053075A1 (en) Method for reducing the emission of aldehydes and other volatile organic compounds from wooden materials and compounds for same
DE102007054123B4 (en) Process for the production of fiberboard with reduced formaldehyde emission, high moisture resistance and hydrolysis resistance of the gluing
EP2607032B1 (en) Method of reducing the emissions of fleeting organic compounds in wooden materials and wooden material
DE102008050428A1 (en) Medium-density fiberboard manufacturing method, involves performing disintegration of fiber plates in presence of accelerator provided for alkaline hardening phenol formaldehyde resin and as potassium carbonate and/or sodium carbonate
EP3352957B1 (en) Method for maufacturing osb panels and osb panel
EP1944144B1 (en) Method for manufacturing a moulded form containing cellulose
WO2024046878A2 (en) Process for producing a woodbase material board provided with a flame retardant
DE102008023007A1 (en) Method for producing moisture-resistant and hydrolysis-resistant medium density fiberboard from e.g. derived timber product, involves using chemicals for pulping, where chemicals partially or completely replace resin in gluing phase
DE102005062173A1 (en) Process to produce chipboard with low formaldehyde content using formaldehyde tannin resin

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20100427

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR

AX Request for extension of the european patent

Extension state: AL BA RS

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

INTG Intention to grant announced

Effective date: 20160602

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: SWISS KRONO TEC AG

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: AT

Ref legal event code: REF

Ref document number: 837933

Country of ref document: AT

Kind code of ref document: T

Effective date: 20161115

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

Free format text: LANGUAGE OF EP DOCUMENT: GERMAN

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 502009013238

Country of ref document: DE

RAP2 Party data changed (patent owner data changed or rights of a patent transferred)

Owner name: SWISS KRONO TEC AG

REG Reference to a national code

Ref country code: CH

Ref legal event code: NV

Representative=s name: BRAUNPAT BRAUN EDER AG, CH

REG Reference to a national code

Ref country code: RO

Ref legal event code: EPE

REG Reference to a national code

Ref country code: SE

Ref legal event code: TRGR

Ref country code: PT

Ref legal event code: SC4A

Ref document number: 2272644

Country of ref document: PT

Date of ref document: 20170110

Kind code of ref document: T

Free format text: AVAILABILITY OF NATIONAL TRANSLATION

Effective date: 20161230

REG Reference to a national code

Ref country code: NL

Ref legal event code: FP

REG Reference to a national code

Ref country code: LT

Ref legal event code: MG4D

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LV

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20161019

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170119

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20161019

REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2611080

Country of ref document: ES

Kind code of ref document: T3

Effective date: 20170504

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: HR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20161019

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170219

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20161019

REG Reference to a national code

Ref country code: SK

Ref legal event code: T3

Ref document number: E 22822

Country of ref document: SK

REG Reference to a national code

Ref country code: HU

Ref legal event code: HC9C

Owner name: SWISS KRONO TEC AG, CH

Free format text: FORMER OWNER(S): SWISS KRONO TEC AG, CH

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 9

Ref country code: DE

Ref legal event code: R097

Ref document number: 502009013238

Country of ref document: DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20161019

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20161019

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

REG Reference to a national code

Ref country code: HU

Ref legal event code: AG4A

Ref document number: E031829

Country of ref document: HU

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BG

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170119

Ref country code: SM

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20161019

26N No opposition filed

Effective date: 20170720

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20161019

REG Reference to a national code

Ref country code: IE

Ref legal event code: MM4A

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20170706

REG Reference to a national code

Ref country code: CH

Ref legal event code: PCAR

Free format text: NEW ADDRESS: HOLEESTRASSE 87, 4054 BASEL (CH)

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20180620

Year of fee payment: 19

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20161019

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MC

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20161019

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CZ

Payment date: 20190627

Year of fee payment: 11

Ref country code: PL

Payment date: 20190625

Year of fee payment: 11

Ref country code: PT

Payment date: 20190627

Year of fee payment: 11

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 20190722

Year of fee payment: 11

Ref country code: LU

Payment date: 20190722

Year of fee payment: 11

Ref country code: RO

Payment date: 20190626

Year of fee payment: 11

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SK

Payment date: 20190626

Year of fee payment: 11

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CY

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20161019

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: ES

Payment date: 20190822

Year of fee payment: 11

Ref country code: SE

Payment date: 20190725

Year of fee payment: 11

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20161019

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: HU

Payment date: 20190621

Year of fee payment: 11

Ref country code: BE

Payment date: 20190722

Year of fee payment: 11

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20161019

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CZ

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20200706

REG Reference to a national code

Ref country code: SE

Ref legal event code: EUG

REG Reference to a national code

Ref country code: NL

Ref legal event code: MM

Effective date: 20200801

REG Reference to a national code

Ref country code: SK

Ref legal event code: MM4A

Ref document number: E 22822

Country of ref document: SK

Effective date: 20200706

REG Reference to a national code

Ref country code: BE

Ref legal event code: MM

Effective date: 20200731

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: RO

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20200706

Ref country code: NL

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20200801

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20200706

Ref country code: PT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20210208

Ref country code: HU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20200707

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20200707

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20200731

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SK

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20200706

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20200706

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 20211229

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20200707

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: TR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20200706

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PL

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20200706

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20220725

Year of fee payment: 14

Ref country code: AT

Payment date: 20220718

Year of fee payment: 14

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20220725

Year of fee payment: 14

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 20220727

Year of fee payment: 14

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20230629

Year of fee payment: 15

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

REG Reference to a national code

Ref country code: AT

Ref legal event code: MM01

Ref document number: 837933

Country of ref document: AT

Kind code of ref document: T

Effective date: 20230706

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20230706

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20230706

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20230706

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20230706

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20230731

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20230731