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 PDFInfo
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
- B27N1/00—Pretreatment of moulding material
- B27N1/003—Pretreatment of moulding material for reducing formaldehyde gas emission
Definitions
- the 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)
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)
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)
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)
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)
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 |
-
1994
- 1994-09-02 DE DE4431316A patent/DE4431316C1/de not_active Expired - Fee Related
-
1995
- 1995-08-14 EP EP95112789A patent/EP0699510B1/fr not_active Expired - Lifetime
- 1995-08-14 AT AT95112789T patent/ATE166278T1/de not_active IP Right Cessation
- 1995-08-14 DE DE59502232T patent/DE59502232D1/de not_active Expired - Lifetime
Patent Citations (7)
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)
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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