EP2546039B1 - Method of reducing the emissions of aldehydes and fleeting organic compounds in OSB-boards, use of additives therefore and OSB-board - Google Patents

Method of reducing the emissions of aldehydes and fleeting organic compounds in OSB-boards, use of additives therefore and OSB-board Download PDF

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Publication number
EP2546039B1
EP2546039B1 EP12187385.5A EP12187385A EP2546039B1 EP 2546039 B1 EP2546039 B1 EP 2546039B1 EP 12187385 A EP12187385 A EP 12187385A EP 2546039 B1 EP2546039 B1 EP 2546039B1
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wood
wood strands
thiosulphate
additive
urea
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German (de)
French (fr)
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EP2546039A2 (en
EP2546039A3 (en
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Dr. Dirk Grunwald
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Kronotec AG
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Kronotec AG
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Priority to PL12187385T priority patent/PL2546039T3/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
    • B27N1/00—Pretreatment of moulding material
    • B27N1/003—Pretreatment of moulding material for reducing formaldehyde gas emission

Definitions

  • the present invention relates to a process according to claim 1 for the production of 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 methods for reducing the emission of volatile organic compounds and aldehydes, including formaldehyde, wherein wood or the lignocellulosic minerals are treated with thiosulfates, preferably a certain combination of thiosulfate and urea compounds, to control the emission of such volatile organic compounds To prevent aldehydes from the wood or the manufactured wood material.
  • the present invention relates to OSB boards obtainable by this method according to claim 10, and use according to claim 11.
  • the present invention provides treating agents for treating wood or lignocellulosic crushed products and wood-based materials made therefrom which are capable of containing the emission of aldehydes To reduce 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 (UF) adhesives, melamine-urea-phenol-formaldehyde adhesives (MUPF adhesives) or melamine-urea-formaldehyde adhesives (MUF adhesives).
  • aminoplast adhesives such as urea-formaldehyde (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
  • PF
  • 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.
  • the wood materials produced by methods of the prior art show an unsatisfactory VOC and aldehyde emission, especially during prolonged use.
  • VOCs especially the aldehydes
  • formaldehyde emission of wood-based materials it is an object of the present invention using chemical additives to limit the emission of VOCs (especially the aldehydes) 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.
  • the object is achieved by adding a special composition to the wood or the lignocellulose-containing comminution products or the wood-based materials in order, by reaction with the VOCs and the aldehydes, to modify them so that they no longer consist of the wood or the comminution products emit the wood materials produced from the shredded 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.
  • wood-based materials made of wood or the lignocellulose-containing shredded products are in particular the release of the VOCs and aldehydes when in use. 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 outlined above, over time by chemical reactions in the lignocellulosic 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 a corresponding primary emission or secondary or tertiary emissions, as stated above, from the Emit wood.
  • VOCs and aldehydes including formaldehyde
  • 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.
  • a significant advantage of the present invention is provided in additives that reduce in a reduction step aldehydes but also other volatile organic compounds, especially those with double bonds, so that the emission of these VOCs and aldehydes including formaldehyde are also reduced in the long term and a disorder 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 is an alkali, alkaline earth metal or ammonium
  • the emissions, in particular the long-term emission of VOCs and aldehydes including Formaldehyde can be reduced from wood and wood-based materials.
  • the additive thus preferably contains at least one component in each case from the two groups i) and ii).
  • Group i) comprises thiosulfates. These 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.
  • the components mentioned antioxidant properties can suppress the VOC emission, which are caused for example by oxidation.
  • the resulting from the thiosulfate intermediate sulfite may, for. 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 comminution products.
  • 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 added to the wood or the comminution products or the wood-based materials in the process according to the invention. 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. B. a mixture with 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 treatment agents according to the invention can be used to reduce emissions from wood, lignocellulose-containing comminution products or wood-based materials, for. 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 limited to adhesives based on isocyanates, for example 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.
  • the present invention further relates to compositions (treating agents) for treating wood, lignocellulose-containing comminution products and wood-based materials and for 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.
  • VOC volatile organic compounds
  • aldehydes including formaldehyde
  • VOC volatile organic compounds
  • aldehydes including formaldehyde
  • thiosulfate salt preferably in combination with ii) Urea and urea derivatives.
  • 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.
  • OSB sheets obtainable according to the method of the invention. These OSB boards are characterized by a reduced emission of volatile organic compounds, in particular the aldehydes including formaldehyde.

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  • 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 ein Verfahren gemäß Anspruch 1 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 Verfahren 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 mit diesem Verfahren herstellbare OSB-Platten gemäß Anspruch 10, und Verwendung gemäß Anspruch 11. Insbesondere stellt die vorliegende Erfindung Behandlungsmittel 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 a process according to claim 1 for the production of 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 methods for reducing the emission of volatile organic compounds and aldehydes, including formaldehyde, wherein wood or the lignocellulosic minerals are treated with thiosulfates, preferably a certain combination of thiosulfate and urea compounds, to control the emission of such volatile organic compounds To prevent aldehydes from the wood or the manufactured wood material. Furthermore, the present invention relates to OSB boards obtainable by this method according to claim 10, and use according to claim 11. In particular, the present invention provides treating agents for treating wood or lignocellulosic crushed products and wood-based materials made therefrom which are capable of containing the emission of aldehydes To reduce 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 (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.

Aus der JP 2011 64 235 sind Verfahren zur Verminderung der Emission von Formaldehyd aus Holzwerkstoffen bekannt, wobei Thiosulfat als Additiv eingesetzt wird in Verbindung mit Formaldehydhaltigen Klebstoffen.From the JP 2011 64 235 are known processes for reducing the emission of formaldehyde from wood materials, with thiosulfate is used as an additive in conjunction with formaldehyde-containing adhesives.

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 (insbesondere der Aldehyde) 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 emission of VOCs (especially the aldehydes) 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 dadurch gelöst, dass 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 adding a special composition to the wood or the lignocellulose-containing comminution products or the wood-based materials in order, by reaction with the VOCs and the aldehydes, to modify them so that they no longer consist of the wood or the comminution products emit the wood materials produced from the shredded 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.One problem with wood-based materials made of wood or the lignocellulose-containing shredded products is in particular the release of the VOCs and aldehydes when in use. 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 outlined above, over time by chemical reactions in the lignocellulosic 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 a 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. 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.A significant advantage of the present invention is provided in additives that reduce in a reduction step aldehydes but also other volatile organic compounds, especially those with double bonds, so that the emission of these VOCs and aldehydes including formaldehyde are also reduced in the long term and a disorder the technological process does not occur. 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 is an alkali, alkaline earth metal or ammonium, the emissions, in particular the long-term emission of VOCs and aldehydes including Formaldehyde can be reduced from wood and wood-based materials.

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. Es handelt 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. These 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 may, for. 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 dem erfindungsgemäßen Verfahren mindestens ein Thiosulfat den Zerkleinerungsprodukten zugesetzt. Bevorzugt handelt es sich bei den dabei verwendeten Salzen um Ammoniumthiosulfat und/oder Natriumthiosulfat.In a preferred embodiment, in the process according to the invention, at least one thiosulfate is added to the comminution products. 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 im erfindungsgemäßen Verfahren zugesetzt. 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 added to the wood or the comminution products or the wood-based materials in the process according to the invention. 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. B. a mixture with 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 erfindungsgemäßen 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 wird sich auf Klebstoffe auf Basis von Isocyanaten, z.B PMDI, beschränkt.The treatment agents according to the invention can be used to reduce emissions from wood, lignocellulose-containing comminution products or wood-based materials, for. 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 limited to adhesives based on isocyanates, for example 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.

Die vorliegende Erfindung betrifft des Weiteren 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.The present invention further relates to compositions (treating agents) for treating wood, lignocellulose-containing comminution products and wood-based materials and for 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.

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 OSB-Platten erhältlich gemäß dem erfindungsgemäßen Verfahren bereit. Diese OSB-Platten zeichnen sich durch eine verringerte Emission an flüchtigen organischen Verbindungen insbesondere den Aldehyden einschließlich Formaldehyd aus.Finally, the present invention provides OSB sheets obtainable according to the method of the invention. These OSB boards are characterized by a reduced emission of volatile organic compounds, in particular the aldehydes including formaldehyde.

Claims (11)

  1. A method of reducing the emission of volatile organic compounds and aldehydes from OSB panels produced from wood strands, which comprises the steps of
    a) providing wood strands,
    b) adding an additive to the wood strands, wherein the additive is at least one thiosulphate of general formula MeS203 or Me2 (S203), where Me is an alkali metal, an alkaline earth metal or ammonium, to treat the wood strands, and
    c) compression moulding the additive-admixed wood strands with an adhesive based on isocyanates under thermal treatment to produce the OSB panels.
  2. A method of reducing the emission of volatile organic compounds and aldehydes from OSB panels according to Claim 1 produced from wood strands, which comprises the steps of
    a) providing wood strands,
    b) adding an additive to the wood strands, 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 MeS203 or Me2 (S203), where Me is an alkali metal, alkaline earth metal or ammonium; and the second component is at least one from group ii) urea and urea derivatives, to treat the wood strands, and
    c) compression moulding the additive-admixed wood strands with an adhesive based on isocyanates under thermal treatment to produce the OSB panels.
  3. A method according to either 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.
  4. A method according to any preceding claim, characterized in that the component from group ii) is urea, or a urea derivative from monomethylolurea, methyleneurea, preferably urea.
  5. A method 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.
  6. A method according to any preceding claim, wherein the amount of urea or urea derivative is from 0.1 wt% to 5 wt% of solids based on absolutely dry lignocellulose.
  7. A method according to any preceding claim, wherein the components of groups i) and ii) are applied to the wood strands separately from each other.
  8. A method according to any preceding claim, wherein the additive is admixed to the wood strands before compression moulding but after defibration or chipping.
  9. A method according to any preceding claim, wherein the additive is admixed before or after resinating the defibrated or chipped wood strands.
  10. An OSB panel obtainable with a method according to any of Claims 1 to 9.
  11. The use of at least one component from group i), preferably at least one component from each of groups i) and ii), wherein group i) includes thiosulphates of general formula MeS203 or Me2 (S203), where Me is an alkali metal, alkaline earth metal or ammonium; and group ii) includes ureas and urea derivatives, for reducing the emission of volatile organic compounds and aldehydes including formaldehyde from OSB panels produced from wood strands with PMDI as adhesive.
EP12187385.5A 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 Active EP2546039B1 (en)

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