EP0699510A2 - Procédé pour baisser le relâchement de formaldehyde de produits à base de lignocellulose - Google Patents

Procédé pour baisser le relâchement de formaldehyde de produits à base de lignocellulose Download PDF

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Publication number
EP0699510A2
EP0699510A2 EP95112789A EP95112789A EP0699510A2 EP 0699510 A2 EP0699510 A2 EP 0699510A2 EP 95112789 A EP95112789 A EP 95112789A EP 95112789 A EP95112789 A EP 95112789A EP 0699510 A2 EP0699510 A2 EP 0699510A2
Authority
EP
European Patent Office
Prior art keywords
formaldehyde
tannin
chipboard
urea
lignocelluloses
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.)
Granted
Application number
EP95112789A
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German (de)
English (en)
Other versions
EP0699510B1 (fr
EP0699510A3 (fr
Inventor
Eberhard V. Bistram
Josef Beer
Heinz Schmidt
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.)
Schlingmann GmbH and Co
Original Assignee
Schlingmann GmbH and Co
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Filing date
Publication date
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Application filed by Schlingmann GmbH and Co filed Critical Schlingmann GmbH and Co
Publication of EP0699510A2 publication Critical patent/EP0699510A2/fr
Publication of EP0699510A3 publication Critical patent/EP0699510A3/fr
Application granted granted Critical
Publication of EP0699510B1 publication Critical patent/EP0699510B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B27WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27NMANUFACTURE 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
    • B27N1/00Pretreatment of moulding material
    • B27N1/003Pretreatment of moulding material for reducing formaldehyde gas emission

Definitions

  • the invention relates to a method for reducing the formaldehyde release of aminoplast-bound pressed lignocellulose products, in particular wood chips and fiberboard, which by gluing wood fibers and wood chips with condensation products of urea and / or melamine and / or phenol and formaldehyde, optionally in a mixture with another Aldehyde.
  • chipboard for furniture and construction, wood chips or other lignocellulose-containing particles are glued with a urea-formaldehyde resin in amounts of usually 8 to 10% by weight, based on the dry chip material, sprinkled into chip mats and under heat and pressure pressed.
  • the hot chipboard is usually stacked after pressing.
  • binders such as alkaline-curing phenol-formaldehyde resins, polymers based on diisocyanates (PMDI), etc. can be used. These binders have so far been of comparatively little importance, since they are either expensive or have other disadvantages.
  • Particle boards that contain urea-formaldehyde resins or other amino resins as binders release formaldehyde over a relatively long period of time after production.
  • the formaldehyde release of this type of plate depends on various factors, such as molar ratio of urea to formaldehyde in the resin used, pressing time, amount of binder, age of the plates etc.
  • the formaldehyde released can reach values that severely impair the well-being of people in rooms in which chipboard bonded with urea-formaldehyde resin is installed.
  • EP-PS 0 006 486 a method for reducing the formaldehyde release of aminoplast-bonded chipboard or fiberboard is known, in which urea or other ammonia-releasing substances are released onto the surface of the boards in the hot state immediately or at a short time after they have been removed from the heating press be applied in the form of an aqueous solution.
  • the present invention is based on the task of producing boards with extremely low formaldehyde release, the formaldehyde release of which hardly differs from that of natural wood.
  • urea-formaldehyde resin eg 8% solids based on the weight of the wood chips
  • formaldehyde-urea molar ratio F: U of 1: 1 with tannin in amounts of approximately 0.5% by weight on the weight of the wood shavings.
  • hydrolyzable tannins and condensed tannins, the latter of which have a significantly higher reactivity to formaldehyde (Holz-Zentralblatt 1994, No. 6, pp. 90-93) and are therefore preferred in the process described here.
  • the condensed tannin is preferably obtained from quebracho wood, in a manner known per se, by boiling out the wood, after which the extract obtained can be dried and pulverized.
  • the tannin can be added to the chips in powder form or in liquid form. Then the glued wood chips become chip mats manufactured and hot-pressed to chipboard in the usual way. After pressing, the plates, while still hot, are treated in the manner known per se with basic, that is to say formaldehyde-reactive substances, for example sprayed with an aqueous urea solution.
  • the chipboard produced in this way is designated "Type 1" in the table below.
  • chipboard was produced with urea-formaldehyde resin without the addition of tannins and then sprayed with formaldehyde-reactive substances in the hot state (type 2). Furthermore, chipboard was produced with urea-formaldehyde resin and the chips were mixed with tannins in amounts of 0.5% (parts by weight based on the weight of the chips) before gluing with urea-formaldehyde resin. However, the chipboard was not sprayed after production (type 3). Furthermore, chipboard with urea-formaldehyde resin as a binder was produced in amounts of 10% (parts by weight based on the weight of the wood chips). Neither condensed tannins were added to the wood shavings, nor were the particle boards aftertreated with formaldehyde-reactive substances (type 4).

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)
  • Compounds Of Unknown Constitution (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
  • Paper (AREA)
  • Polysaccharides And Polysaccharide Derivatives (AREA)
EP95112789A 1994-09-02 1995-08-14 Procédé pour baisser le relâchement de formaldehyde de produits à base de lignocellulose Expired - Lifetime EP0699510B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4431316A DE4431316C1 (de) 1994-09-02 1994-09-02 Verfahren zur Verminderung der Formaldehydabgabe von Holzspan- oder Faserplatten
DE4431316 1994-09-02

Publications (3)

Publication Number Publication Date
EP0699510A2 true EP0699510A2 (fr) 1996-03-06
EP0699510A3 EP0699510A3 (fr) 1996-07-10
EP0699510B1 EP0699510B1 (fr) 1998-05-20

Family

ID=6527279

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95112789A Expired - Lifetime EP0699510B1 (fr) 1994-09-02 1995-08-14 Procédé pour baisser le relâchement de formaldehyde de produits à base de lignocellulose

Country Status (3)

Country Link
EP (1) EP0699510B1 (fr)
AT (1) ATE166278T1 (fr)
DE (2) DE4431316C1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0788866A2 (fr) * 1996-02-09 1997-08-13 Schlingmann GmbH & Co. Procédé pour la fabrication de pannau d'agglomeré et panneaux de fibres ayant un faible contenu en formaldehyde en utilisant des liants à base de tannin
DE19751326A1 (de) * 1997-11-19 1999-05-27 Pfleiderer Unternehmensverwalt Holzwerkstoffe, enthaltend aminoplasthaltige Gebraucht-, Rest- bzw. Abfallholzwerkstoffe, sowie Verfahren zu ihrer Herstellung und Verfahren zur Verwertung von Gebraucht-, Rest- und Abfallholzwerkstoffen
EP0924280A1 (fr) * 1997-12-15 1999-06-23 Silva S.r.l. Composition adhésive thermodurcissable à base de tannin condensé et son utilisation dans l'industrie du bois
EP1266730A1 (fr) * 2001-06-12 2002-12-18 Akzo Nobel N.V. Procédé de fabrication des panneaux de fibres résistant à l'humidité
WO2010031718A1 (fr) 2008-09-19 2010-03-25 Basf Se Corps moulés multicouches contenant de la lignocellulose, à faible émission de formaldéhyde
US8466247B2 (en) 2008-02-11 2013-06-18 Basf Se Formaldehyde-free binders for producing wood products

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE20316621U1 (de) * 2003-10-28 2004-02-12 Fritz Egger Gmbh & Co Emissionsarme OSB-Platte
DE102005019627B3 (de) * 2005-04-26 2006-10-26 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Verfahren zur Herstellung von mitteldichten Faserplatten und Faserformteilen mit verringerter Emission und niedriger Dickenquellung
US8623501B2 (en) 2010-03-04 2014-01-07 Basf Se Lignocellulose materials having good mechanical properties
US8920923B2 (en) 2010-03-04 2014-12-30 Basf Se Lignocellulose materials having good mechanical properties

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2317884A1 (de) * 1973-04-10 1974-10-24 E Schnitzler Gmbh & Co Dr Verfahren zur herstellung von holzwerkstoffen
US4075394A (en) * 1976-04-08 1978-02-21 The Dow Chemical Company Process of inhibiting tannin migration in tannin-containing wood substrates
EP0006486A2 (fr) * 1978-07-01 1980-01-09 Swedspan Ab Procédé pour diminuer l'émission de formaldéhyde de panneaux de particules
EP0027583B1 (fr) * 1979-10-11 1984-04-04 Swedspan Ab Procédé pour réduire le dégagement de formaldéhyde de panneaux de particules encollés avec une résine carbamide
FR2572010A1 (fr) * 1984-10-23 1986-04-25 Desowag Bayer Holzschutz Gmbh Procede de fabrication de panneaux de particules ou de fibres et concentre utilisable comme additif a des liants pour la fabrication de tels panneaux
DE4022348A1 (de) * 1990-07-13 1992-01-16 Fraunhofer Ges Forschung Verfahren zur herstellung von holzwerkstoffen
EP0536795A1 (fr) * 1991-10-09 1993-04-14 Fraunhofer-Gesellschaft Zur Förderung Der Angewandten Forschung E.V. Procédé de fabrication de panneaux en particules de bois et de panneaux de moyenne densité en fibres de bois

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1653167A1 (de) * 1967-11-24 1971-09-16 Basf Ag Verfahren zur Herstellung von Spanplatten mit verminderter nachtraeglicher Formaldehydabspaltung
DE2851589C3 (de) * 1978-11-29 1983-06-16 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V., 8000 München Mehrschichtige Span- oder Faserplatte, die in einem Teilbereich bzw. Teilbereichen einen Aminoplast als Bindemittel enthält

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2317884A1 (de) * 1973-04-10 1974-10-24 E Schnitzler Gmbh & Co Dr Verfahren zur herstellung von holzwerkstoffen
US4075394A (en) * 1976-04-08 1978-02-21 The Dow Chemical Company Process of inhibiting tannin migration in tannin-containing wood substrates
EP0006486A2 (fr) * 1978-07-01 1980-01-09 Swedspan Ab Procédé pour diminuer l'émission de formaldéhyde de panneaux de particules
EP0027583B1 (fr) * 1979-10-11 1984-04-04 Swedspan Ab Procédé pour réduire le dégagement de formaldéhyde de panneaux de particules encollés avec une résine carbamide
FR2572010A1 (fr) * 1984-10-23 1986-04-25 Desowag Bayer Holzschutz Gmbh Procede de fabrication de panneaux de particules ou de fibres et concentre utilisable comme additif a des liants pour la fabrication de tels panneaux
DE4022348A1 (de) * 1990-07-13 1992-01-16 Fraunhofer Ges Forschung Verfahren zur herstellung von holzwerkstoffen
EP0536795A1 (fr) * 1991-10-09 1993-04-14 Fraunhofer-Gesellschaft Zur Förderung Der Angewandten Forschung E.V. Procédé de fabrication de panneaux en particules de bois et de panneaux de moyenne densité en fibres de bois

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0788866A2 (fr) * 1996-02-09 1997-08-13 Schlingmann GmbH & Co. Procédé pour la fabrication de pannau d'agglomeré et panneaux de fibres ayant un faible contenu en formaldehyde en utilisant des liants à base de tannin
EP0788866A3 (fr) * 1996-02-09 1998-01-07 Schlingmann GmbH & Co. Procédé pour la fabrication de pannau d'agglomeré et panneaux de fibres ayant un faible contenu en formaldehyde en utilisant des liants à base de tannin
DE19751326A1 (de) * 1997-11-19 1999-05-27 Pfleiderer Unternehmensverwalt Holzwerkstoffe, enthaltend aminoplasthaltige Gebraucht-, Rest- bzw. Abfallholzwerkstoffe, sowie Verfahren zu ihrer Herstellung und Verfahren zur Verwertung von Gebraucht-, Rest- und Abfallholzwerkstoffen
DE19751326C2 (de) * 1997-11-19 2001-01-04 Pfleiderer Unternehmensverwalt Verfahren zur Herstellung von Holzwerkstoffen unter Verwertung von Gebraucht-, Rest- und Abfallholzwerkstoffen
EP0924280A1 (fr) * 1997-12-15 1999-06-23 Silva S.r.l. Composition adhésive thermodurcissable à base de tannin condensé et son utilisation dans l'industrie du bois
EP1266730A1 (fr) * 2001-06-12 2002-12-18 Akzo Nobel N.V. Procédé de fabrication des panneaux de fibres résistant à l'humidité
US8466247B2 (en) 2008-02-11 2013-06-18 Basf Se Formaldehyde-free binders for producing wood products
WO2010031718A1 (fr) 2008-09-19 2010-03-25 Basf Se Corps moulés multicouches contenant de la lignocellulose, à faible émission de formaldéhyde
EP2172333A1 (fr) * 2008-09-19 2010-04-07 Basf Se Corps de formage à teneur en lignocellulose multicouche à émission en formaldéhyde réduite

Also Published As

Publication number Publication date
EP0699510B1 (fr) 1998-05-20
EP0699510A3 (fr) 1996-07-10
DE59502232D1 (de) 1998-06-25
ATE166278T1 (de) 1998-06-15
DE4431316C1 (de) 1996-05-02

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