EP2546039B1 - Procédé destiné à la réduction d'émissions d'aldéhydes et de liaisons organiques volatiles de panneaux OSB, l'utilisation d'additifs à cet effet et panneau OSB - Google Patents

Procédé destiné à la réduction d'émissions d'aldéhydes et de liaisons organiques volatiles de panneaux OSB, l'utilisation d'additifs à cet effet et panneau OSB 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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EP
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Prior art keywords
wood
wood strands
thiosulphate
additive
urea
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EP12187385.5A
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German (de)
English (en)
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EP2546039A3 (fr
EP2546039A2 (fr
Inventor
Dr. Dirk Grunwald
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Kronotec AG
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Kronotec AG
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Priority to EP12187385.5A priority Critical patent/EP2546039B1/fr
Priority to PL12187385T priority patent/PL2546039T3/pl
Publication of EP2546039A2 publication Critical patent/EP2546039A2/fr
Publication of EP2546039A3 publication Critical patent/EP2546039A3/fr
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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 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)

Claims (11)

  1. Procédé de réduction de l'émission de composés organiques volatils et d'aldéhydes à partir de panneaux OSB fabriqués à partir de lamelles de bois, comprenant les étapes suivantes :
    a) la préparation de lamelles de bois,
    b) l'ajout d'un additif aux lamelles de bois, l'additif étant au moins un thiosulfate de formule générale MeS203 ou Me2 (S203), Me étant un métal alcalin, alcalino-terreux ou l'ammonium, pour le traitement des lamelles de bois, et
    c) la compression des lamelles de bois mélangées avec l'additif avec un adhésif à base d'isocyanates sous traitement thermique pour la fabrication de panneaux OSB.
  2. Procédé de réduction de l'émission de composés organiques volatils et d'aldéhydes à partir de panneaux OSB fabriqués à partir de lamelles de bois selon la revendication 1, comprenant les étapes suivantes :
    a) la préparation de lamelles de bois,
    b) l'ajout d'un additif aux lamelles de bois, l'additif étant une combinaison d'au moins deux composants, le premier composant étant au moins un composant du groupe i) constitué par les thiosulfates de formule générale MeS203 ou Me2(S203), Me étant un métal alcalin, alcalino-terreux ou l'ammonium ; et le second composant étant au moins un composant du groupe ii) constitué par l'urée et les dérivés d'urée, pour le traitement des lamelles de bois, et
    c) la compression des lamelles de bois mélangées avec l'additif avec un adhésif à base d'isocyanates sous traitement thermique pour la fabrication de panneaux OSB.
  3. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le thiosulfate du groupe i) est choisi parmi le thiosulfate de sodium, le thiosulfate d'ammonium, le thiosulfate de lithium, le thiosulfate de potassium, le thiosulfate de calcium, le thiosulfate de magnésium ou leurs mélanges, notamment le thiosulfate de sodium ou le thiosulfate d'ammonium.
  4. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le composant du groupe ii) est l'urée ou un dérivé d'urée à base de monométhylolurée, de méthylène-urée, de préférence l'urée.
  5. Procédé selon l'une quelconque des revendications précédentes, dans lequel la quantité de thiosulfate est de 0,1 % en poids à 5 % en poids de solide par rapport à la lignocellulose atro.
  6. Procédé selon l'une quelconque des revendications précédentes, dans lequel la quantité d'urée ou de dérivé d'urée est de 0,1 % en poids à 5 % en poids de solide par rapport à la lignocellulose atro.
  7. Procédé selon l'une quelconque des revendications précédentes, dans lequel les composants du groupe i) et ii) sont appliqués séparément l'un de l'autre sur les lamelles de bois.
  8. Procédé selon l'une quelconque des revendications précédentes, dans lequel l'additif est ajouté avant la compression, mais après la mise en fibres ou la mise en copeaux des lamelles de bois.
  9. Procédé selon l'une quelconque des revendications précédentes, dans lequel l'ajout de l'additif a lieu avant ou après l'encollage des lamelles de bois mises en fibres ou mise en copeaux.
  10. Panneau OSB pouvant être obtenu par un procédé selon l'une quelconque des revendications 1 à 9.
  11. Utilisation d'au moins un composant du groupe i), de préférence d'au moins un composant de chacun des groupes i) et ii), le groupe i) comprenant les thiosulfates de formule générale MeS203 ou Me2(S203), Me étant un métal alcalin, alcalino-terreux ou l'ammonium ; et le groupe ii) comprenant l'urée et les dérivés d'urée, pour réduire l'émission de composés organiques volatils et d'aldéhydes, y compris de formaldéhyde, à partir de panneaux OSB fabriqués à partir de lamelles de bois avec du PMDI en tant qu'adhésif.
EP12187385.5A 2009-07-06 2009-07-06 Procédé destiné à la réduction d'émissions d'aldéhydes et de liaisons organiques volatiles de panneaux OSB, l'utilisation d'additifs à cet effet et panneau OSB Active EP2546039B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP12187385.5A EP2546039B1 (fr) 2009-07-06 2009-07-06 Procédé destiné à la réduction d'émissions d'aldéhydes et de liaisons organiques volatiles de panneaux OSB, l'utilisation d'additifs à cet effet et panneau OSB
PL12187385T PL2546039T3 (pl) 2009-07-06 2009-07-06 Sposób redukcji emisji aldehydów i lotnych związków organicznych z płyt OSB, stosowanie substancji dodatkowych do realizacji tego celu i płyta OSB

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP12187385.5A EP2546039B1 (fr) 2009-07-06 2009-07-06 Procédé destiné à la réduction d'émissions d'aldéhydes et de liaisons organiques volatiles de panneaux OSB, l'utilisation d'additifs à cet effet et panneau OSB
EP09008805.5A EP2272644B1 (fr) 2009-07-06 2009-07-06 Procédé destiné à la réduction de l'émission d'aldéhydes et de liaisons organiques volatiles à partir de matières dérivées du bois

Related Parent Applications (3)

Application Number Title Priority Date Filing Date
EP09008805.5 Division 2009-07-06
EP09008805.5A Division-Into EP2272644B1 (fr) 2009-07-06 2009-07-06 Procédé destiné à la réduction de l'émission d'aldéhydes et de liaisons organiques volatiles à partir de matières dérivées du bois
EP09008805.5A Division EP2272644B1 (fr) 2009-07-06 2009-07-06 Procédé destiné à la réduction de l'émission d'aldéhydes et de liaisons organiques volatiles à partir de matières dérivées du bois

Publications (3)

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EP2546039A2 EP2546039A2 (fr) 2013-01-16
EP2546039A3 EP2546039A3 (fr) 2013-03-20
EP2546039B1 true EP2546039B1 (fr) 2014-03-26

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EP09008805.5A Active EP2272644B1 (fr) 2009-07-06 2009-07-06 Procédé destiné à la réduction de l'émission d'aldéhydes et de liaisons organiques volatiles à partir de matières dérivées du bois
EP12187385.5A Active EP2546039B1 (fr) 2009-07-06 2009-07-06 Procédé destiné à la réduction d'émissions d'aldéhydes et de liaisons organiques volatiles de panneaux OSB, l'utilisation d'additifs à cet effet et panneau OSB

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EP09008805.5A Active EP2272644B1 (fr) 2009-07-06 2009-07-06 Procédé destiné à la réduction de l'émission d'aldéhydes et de liaisons organiques volatiles à partir de matières dérivées du bois

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EP (2) EP2272644B1 (fr)
ES (2) ES2468024T3 (fr)
HU (1) HUE031829T2 (fr)
PL (2) PL2546039T3 (fr)
PT (2) PT2546039E (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008020642A1 (de) * 2008-04-24 2009-10-29 Kronotec Ag Verfahren zur Herstellung von Holzwerkstoffen und Holzwerkstoffe
KR101214074B1 (ko) * 2012-02-27 2012-12-20 백철기 무공해 갈대 합성 목재 및 그의 제조방법
CN102615690B (zh) * 2012-04-12 2014-03-12 文安县天华密度板有限公司 氨气熏蒸木纤维生产环保型人造板的方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
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JP2001164235A (ja) * 1999-09-30 2001-06-19 Kyokutoo International:Kk ホルムアルデヒド捕捉剤、木質板の処理方法及び木質板
SK11242003A3 (sk) 2001-03-12 2004-05-04 Akzo Nobel N. V. Spôsob redukcie emisií formaldehydu z vrstvených produktov s vyšším obsahom formaldehydu
WO2006010192A1 (fr) * 2004-07-27 2006-02-02 Orica Australia Pty. Ltd. Système pour fournir un substrat cellulosique reconstitué enduit de poudre
US20090145564A1 (en) 2005-07-27 2009-06-11 Wolfgang Seifert Method for production of wood material articles with low emissions of chemical compounds
DE102007038041A1 (de) 2007-08-10 2009-02-12 Kronotec Ag Verfahren zur Vermeidung der Emission von Aldehyden und flüchtigen organischen Verbindungen aus Holzwerkstoffen

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Publication number Publication date
HUE031829T2 (en) 2017-08-28
PT2546039E (pt) 2014-06-09
EP2546039A3 (fr) 2013-03-20
PL2546039T3 (pl) 2014-08-29
ES2611080T3 (es) 2017-05-04
EP2546039A2 (fr) 2013-01-16
PL2272644T3 (pl) 2017-09-29
EP2272644B1 (fr) 2016-10-19
PT2272644T (pt) 2017-01-10
EP2272644A1 (fr) 2011-01-12
ES2468024T3 (es) 2014-06-13

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