EP0788866B1 - 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 - Google Patents

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 Download PDF

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Publication number
EP0788866B1
EP0788866B1 EP97101931A EP97101931A EP0788866B1 EP 0788866 B1 EP0788866 B1 EP 0788866B1 EP 97101931 A EP97101931 A EP 97101931A EP 97101931 A EP97101931 A EP 97101931A EP 0788866 B1 EP0788866 B1 EP 0788866B1
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EP
European Patent Office
Prior art keywords
tannin
formaldehyde
binder
urea
amount
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.)
Revoked
Application number
EP97101931A
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German (de)
English (en)
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EP0788866A2 (fr
EP0788866A3 (fr
Inventor
Eberhard Von 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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Application filed by Schlingmann GmbH and Co filed Critical Schlingmann GmbH and Co
Publication of EP0788866A2 publication Critical patent/EP0788866A2/fr
Publication of EP0788866A3 publication Critical patent/EP0788866A3/fr
Application granted granted Critical
Publication of EP0788866B1 publication Critical patent/EP0788866B1/fr
Anticipated expiration legal-status Critical
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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 invention relates to a method for producing low-formaldehyde Tannin formaldehyde resins (TF resins) bonded chipboard and fiberboard.
  • TF resins low-formaldehyde Tannin formaldehyde resins
  • acid-curing is used for the production of chipboard Urea formaldehyde resins (UF resins) are used as binders.
  • Other Binders such as phenol formaldehyde resins (PF resins) and adhesives based on Diisocyanates (PMDI) are used as binders for wood chips and fiberboard comparatively minor importance.
  • PF resins phenol formaldehyde resins
  • PMDI Diisocyanates
  • tannins polymeric polyphenols
  • the condensed tannins which e.g. out Quebracho wood and mimosa bark are obtained, but not the hydrolyzable tannins, e.g. made of oak bark, oak wood and chestnut wood originate [cf. e.g. Tannins as binders for wood-based materials (ROFFAEL and DIX, Holz-Zentralblatt, No. 6, pp. 90-93, 1994)].
  • tannin formaldehyde resins as binders is more than adequate 40 years back (DALTON, Austra. J. of Appl. Science, 1, 1950). After that you can Extract substances from certain barks and woods can be condensed with formaldehyde.
  • the tannin-formaldehyde polymers that form can be used for the production of Wood materials are used as binders.
  • the tannins are usually in the form of a 40 to 60% solution for the production of wood-based materials used. It is also known that parts of the tannin are used in powder form to reduce the moisture of the glued chips before pressing (DIX and MARUTZKY, Adphosion, 26, 12, pp. 9-10, 1982). Meanwhile it is also known the tannins with certain lignin sulfonates or sulfite waste liquors as To combine extenders (DE-PS 3123999). Even the combination of tannin with Strength is known.
  • the chipboard bonded with UF resins mainly has two Disadvantages: These are the relatively low moisture resistance of the manufactured Chipboard and the assets, depending on humidity and temperature Release different amounts of formaldehyde into the environment. It has therefore there has been no lack of attempts in the past three decades Reduce formaldehyde release.
  • Chipboards bonded with tannin formaldehyde resins show in comparison particle board glued with urea formaldehyde resin has a high moisture resistance on, but the disadvantage of formaldehyde release is also liable to the use of Tannin formaldehyde resins as binders.
  • To reduce the Formaldehyde release from tannin-bound chipboard and fiberboard could to use urea as a formaldehyde scavenger in the tannin solution. With this Method can reduce formaldehyde release, too high a dosage of urea in the glue liquor, however, has a deterioration in the thickness swelling result. Therefore e.g.
  • tannins can be added without the addition of a crosslinker (e.g. Formaldehyde) solely by thermal treatment in the absence or presence of condense suitable catalysts (PIZZI et al .: autocondensation-based zero emission, tannin adhesives for particleboards, wood as raw material, 53, p. 201-204, 1995).
  • PIZZI et al . autocondensation-based zero emission, tannin adhesives for particleboards, wood as raw material, 53, p. 201-204, 1995.
  • the pressing times required for this are very long.
  • the aim of the invention is therefore to use chipboard with tannin formaldehyde resins to produce that have low formaldehyde release values and at the same time have low thickness swelling and sufficient mechanical strength; so a method to reduce the release of formaldehyde with Tannin formaldehyde resins to develop bound plates without the Adversely affect the strength properties of the plates produced and without the To have to extend pressing times.
  • formaldehyde release is provided which is in the range of the glue-free, but dried wood chips.
  • tannin Due to the partial introduction of the tannin in powder form, the moisture in the mats to be pressed less without the binder content of the board to reduce. This ensures that the part of the tannin, which in is in liquid form, mainly acts as a binder. That in the glue line After pressing, tannin, which is in powder form, acts primarily as a formaldehyde scavenger.
  • DE-P 4431316 already describes the addition of tannin in powder form or in liquid form in particle board bonded with urea formaldehyde resin proposed, but not the addition of tannin both in powder form and in liquid form in tannin-bound chipboard and fiberboard according to present invention.
  • the total amount of dry tannins (atro) can, based on the Chips, between 0.5% and 5% by weight.
  • Condensed tannin will preferably made from quebracho wood and mimosa bark, in itself known manner by water extraction of the wood or the bark at high Temperatures at which the extract obtained is dried and pulverized.
  • Tannin-containing binders in the liquid form to different pH values can be set. Condensed tannins react with the formaldehyde a large pH range, the speed of the reaction depends on the setting of the pH value different.
  • Multi-layer chipboard can also be produced using the method described here are produced in which different layers are used Amounts of tannin and formaldehyde can be used.
  • the plates produced can be sprayed or otherwise treated be stacked with formaldehyde-active fabric. But there is also Possibility to store the manufactured plates first after pressing and only then to be treated later with the formaldehyde-active substances.
  • a tannin solution it can have 10 to 20% by weight of tannin and on a pH of 4 to 10 can be set.
  • the one used for spraying Formaldehyde scavenger solution can be made from various substances, e.g. those according to DE-PS 2829021.
  • Juice-fresh wood chips were dried in a dryer to a moisture content of 3-4% and with a technical 50% solution of quebracho extract, to which 2% by weight, based on the amount of tannin, urea to reduce the viscosity, was added in amounts of 10%. (dry tannin / based on the chips) glued. In addition, the chips were glued with 2% tannin as a powder. After gluing, the chips had a moisture content of approx. 12%. Formaldehyde was also added to the chips as a crosslinking agent in amounts of 9% (active substance / amount of dry tannin) in the form of a 40% solution. The chips were then pressed into 19 mm thick chipboard at a pressure factor of 15 s / mm at 180 ° C. After pressing, the plates were sprayed with a 20% formaldehyde-active substance. After stacking for one week, the formaldehyde release of the chipboard produced was determined in a 1 m 3 climatic chamber.
  • chipboard was produced, in which the entire tannin in liquid form was buried in the chips. As a result, the humidity of the glued chips about 3% higher than in the first case. Subsequently, too added the same amount of formaldehyde and the plates as above described pressed. After pressing, there was no spraying with tannin formaldehyde-active substance. In another experiment, chipboard was used produced, which contain tannin in solid form, but not after pressing were sprayed with formaldehyde scavengers.
  • the formaldehyde release for the plates was partly in solid form contained and then sprayed, 0.02 ppm in the test chamber for which Plates that contain tannin in solid form and have not been sprayed, 0.05 ppm. For plates that do not contain solid tannin and have not been sprayed, the value was 0.1 ppm. From this it can be concluded that the addition of a part of tannin in solid form with only spraying with tannin and / or other formaldehyde-active substances such as Urea a significant Reduction in formaldehyde release. The release of formaldehyde of the dried chips used in the plates in the test chamber was included 0.017 ppm. The formaldehyde release is thus in accordance with the new process produced plates approximately in the same range as that of the dried Wood shavings.

Landscapes

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

Claims (14)

  1. Procédé de fabrication de panneaux à faible teneur en formaldéhyde, constitués de fibres ou de particules de bois liées au moyen d'une résine formaldéhyde à base de tannin, dans lequel le tannin faisant office de liant est déposé sur les copeaux en partie sous forme de poudre et en partie sous forme liquide et les panneaux ainsi préparés sont soumis à un traitement ultérieur avec des substances actives vis-à-vis du formaldéhyde.
  2. Procédé selon la revendication 1, caractérisé en ce que la proportion du liant ajouté sous forme de poudre représente au minimum 10 % en poids de la quantité totale de liant utilisée.
  3. Procédé selon la revendication 1, caractérisé en ce que la proportion du liant ajouté sous forme de poudre représente au maximum 40 % en poids de la quantité totale de liant.
  4. Procédé selon la revendication 1, caractérisé en ce que le liant sous forme liquide a un pH égal à 4.
  5. Procédé selon la revendication 1, caractérisé en ce que le liant sous forme liquide est ajusté à pH 8.
  6. Procédé selon la revendication 1, caractérisé en ce que le liant sous forme liquide est ajusté à pH 10.
  7. Procédé selon la revendication 1, caractérisé en ce que le liant contient au minimum 0,5 % durée, ramené à la quantité de tannin.
  8. Procédé selon la revendication 1, caractérisé en ce que le liant contient jusqu'à 5 % durée, ramené à la quantité de tannin.
  9. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que l'on ajoute au tannin de 5 % à 10 % en poids environ de formaldéhyde servant d'agent de réticulation, ramené au poids du tannin sec.
  10. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que, dans des panneaux multicouches, on utilise des quantités de tannin et de formaldéhyde qui varient d'une couche à l'autre.
  11. Procédé selon la revendication 1, caractérisé en ce que la solution de pulvérisation contient du tannin faisant office d'absorbeur de formaldéhyde.
  12. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que la solution de pulvérisation contient du tannin dans la proportion de 10 à 20 %.
  13. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que la solution de pulvérisation contient, outre le tannin, d'autres substances telles que l'urée et l'ammoniac.
  14. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que les panneaux préparés sont empilés après la pulvérisation des substances actives vis-à-vis du formaldéhyde.
EP97101931A 1996-02-09 1997-02-06 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 Revoked EP0788866B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19604799 1996-02-09
DE19604799 1996-02-09

Publications (3)

Publication Number Publication Date
EP0788866A2 EP0788866A2 (fr) 1997-08-13
EP0788866A3 EP0788866A3 (fr) 1998-01-07
EP0788866B1 true EP0788866B1 (fr) 1998-05-20

Family

ID=7784991

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97101931A Revoked EP0788866B1 (fr) 1996-02-09 1997-02-06 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

Country Status (3)

Country Link
EP (1) EP0788866B1 (fr)
AT (1) ATE166279T1 (fr)
DE (2) DE19704525A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19812523A1 (de) * 1998-03-21 1999-11-18 Schenck Panel Production Syste Verfahren und Vorrichtung zur Strukturierung glatter Holzwerkstoffplatten
EP1048424A3 (fr) * 1999-04-23 2001-01-03 Schlingmann GmbH & Co. Panneau sandwich en liège et son procédé de production
DE10036193A1 (de) * 2000-07-24 2002-02-14 Agrosys Gmbh & Co Kg Verfahren zur Herstellung von Formteilen aus von nachwachsenden Rohstoffen gewonnenem Fasermaterial
DE10036034C2 (de) * 2000-07-24 2003-12-18 Ihd Inst Fuer Holztechnologie Drei-oder mehrlagige Verbundplatte
DE10121651B4 (de) * 2001-05-03 2009-04-02 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Verfahren zur Verminderung der Formaldehydabgabe
EP1266730B1 (fr) * 2001-06-12 2006-03-29 Edmone Roffael Procédé de fabrication des panneaux de fibres résistant à l'humidité
DE102009023643B4 (de) 2009-05-28 2016-08-18 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Holzwerkstoffprodukt und Verfahren zu dessen Herstellung
CN105862520A (zh) * 2016-04-07 2016-08-17 苏州市鼎立包装有限公司 一种耐潮湿纤维板及其制备方法

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DE1055806B (de) * 1957-10-19 1959-04-23 Basf Ag Verfahren zur Herstellung von Platten aus groben Faserstoffen
DE1188750B (de) * 1964-07-28 1965-03-11 Fahlberg List G M B H Formaldehydbindendes Anstrichmittel fuer Holzspanplatten auf der Basis von waessrigen Kunststoffdispersionen
DE1653167A1 (de) * 1967-11-24 1971-09-16 Basf Ag Verfahren zur Herstellung von Spanplatten mit verminderter nachtraeglicher Formaldehydabspaltung
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
EP0012169A1 (fr) * 1978-11-29 1980-06-25 Fraunhofer-Gesellschaft Zur Förderung Der Angewandten Forschung E.V. Panneau de fibres ou de particules multicouche, lié de préférence avec une résine aminoplaste
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DE3123999A1 (de) * 1981-06-19 1983-01-05 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V., 8000 München Verfahren zur verringerung der viskositaet von tanninloesung
DE3443002A1 (de) * 1984-11-26 1986-05-28 Kataflox Patent-Verwaltungsgesellschaft mbH, 7500 Karlsruhe Material zur verminderung der formaldehyd-abspaltung
EP0365708A1 (fr) * 1988-10-28 1990-05-02 Kronospan Anstalt Méthode de fabrication d'articles de bois ou de matériel en fibres
JPH06293009A (ja) * 1992-01-31 1994-10-21 Noda Corp 繊維板の製造方法
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DE4428119A1 (de) * 1994-08-09 1996-02-15 Roffael Edmone Prof Dr Ing Verfahren zur Herstellung von Holzspan- und Faserplatten

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ATE129004T1 (de) * 1990-12-14 1995-10-15 Diteco Ltda Klebstoffzusammensetzung bestehend aus isocyanat, phenolformaldehyd und tannin zur herstellung von sperrholzplatten für die aussenanwendung.
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1055806B (de) * 1957-10-19 1959-04-23 Basf Ag Verfahren zur Herstellung von Platten aus groben Faserstoffen
DE1188750B (de) * 1964-07-28 1965-03-11 Fahlberg List G M B H Formaldehydbindendes Anstrichmittel fuer Holzspanplatten auf der Basis von waessrigen Kunststoffdispersionen
DE1653167A1 (de) * 1967-11-24 1971-09-16 Basf Ag Verfahren zur Herstellung von Spanplatten mit verminderter nachtraeglicher Formaldehydabspaltung
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
EP0012169A1 (fr) * 1978-11-29 1980-06-25 Fraunhofer-Gesellschaft Zur Förderung Der Angewandten Forschung E.V. Panneau de fibres ou de particules multicouche, lié de préférence avec une résine aminoplaste
EP0027583A2 (fr) * 1979-10-11 1981-04-29 Swedspan Ab Procédé pour réduire le dégagement de formaldéhyde de panneaux de particules encollés avec une résine carbamide
DE3123999A1 (de) * 1981-06-19 1983-01-05 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V., 8000 München Verfahren zur verringerung der viskositaet von tanninloesung
DE3443002A1 (de) * 1984-11-26 1986-05-28 Kataflox Patent-Verwaltungsgesellschaft mbH, 7500 Karlsruhe Material zur verminderung der formaldehyd-abspaltung
EP0365708A1 (fr) * 1988-10-28 1990-05-02 Kronospan Anstalt Méthode de fabrication d'articles de bois ou de matériel en fibres
JPH06293009A (ja) * 1992-01-31 1994-10-21 Noda Corp 繊維板の製造方法
DE4402159A1 (de) * 1993-08-21 1995-02-23 Ruetgerswerke Ag Hitzehärtende Bindemittel
DE4334422A1 (de) * 1993-10-08 1995-04-13 Fraunhofer Ges Forschung Streckmittel für Holzwerkstoff-Bindemittel und Verfahren zu seiner Herstellung
DE4428119A1 (de) * 1994-08-09 1996-02-15 Roffael Edmone Prof Dr Ing Verfahren zur Herstellung von Holzspan- und Faserplatten

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Calve, L.: Mwalongo, G.C.J.; Mwingira, B.A., Riedl, B.: Shields, J. A.: Characterization of wattle tannin based adhesives for Tanzania. Holzforschung 49(1995) 3, S.259-268 *
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Chemical Abstracts 105 (1986) 174657W *
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Pizzi, A.; Stephanou, A.: Fast vs. slow-reacting non-modified tannin extracts for exterior particleboard adhesives. Holz als Roh-und Werkstoff 52(1994) S.218-222, springer Verlag 1994 *
Pizzi, A.; Valenezuela, J.; Westermeyer, C.: Low formaldehyde emission, fast pressing, pine and pecan tannin adhesives for exterior particleboaard; Holz als Roh- und Werkstoff 52 (1994) *
Pizzi,A.: Glue blenders effect on particleboard using wattle tannin adhesibes. - Holzforschung und Holzverwertung 31 (1979)4, S 85-86 *
Roffael, E.; Miertzsch, H.: Verminderung der Formaldehydabgabe durchNachbehandlung - Adhäsion 34(1990)4. - S.13-14,16-19 *

Also Published As

Publication number Publication date
EP0788866A2 (fr) 1997-08-13
ATE166279T1 (de) 1998-06-15
DE59700001D1 (de) 1998-06-25
DE19704525A1 (de) 1997-08-14
EP0788866A3 (fr) 1998-01-07

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