EP0144985B1 - Procédé de diminution de l'émission de formaldéhyde, dans des panneaux plaqués, de copeaux ou de fibres agglomérés - Google Patents

Procédé de diminution de l'émission de formaldéhyde, dans des panneaux plaqués, de copeaux ou de fibres agglomérés Download PDF

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Publication number
EP0144985B1
EP0144985B1 EP84114876A EP84114876A EP0144985B1 EP 0144985 B1 EP0144985 B1 EP 0144985B1 EP 84114876 A EP84114876 A EP 84114876A EP 84114876 A EP84114876 A EP 84114876A EP 0144985 B1 EP0144985 B1 EP 0144985B1
Authority
EP
European Patent Office
Prior art keywords
formaldehyde
urea
veneered
chipboard
boards
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.)
Expired - Lifetime
Application number
EP84114876A
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German (de)
English (en)
Other versions
EP0144985A2 (fr
EP0144985A3 (en
Inventor
Edmone Prof. Dr.-Ing. Roffael
Hans-Albrecht May
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.)
Casco Adhesives AB
Original Assignee
Casco Nobel AB
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Filing date
Publication date
Application filed by Casco Nobel AB filed Critical Casco Nobel AB
Priority to AT84114876T priority Critical patent/ATE93444T1/de
Publication of EP0144985A2 publication Critical patent/EP0144985A2/fr
Publication of EP0144985A3 publication Critical patent/EP0144985A3/de
Application granted granted Critical
Publication of EP0144985B1 publication Critical patent/EP0144985B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B27N7/00—After-treatment, e.g. reducing swelling or shrinkage, surfacing; Protecting the edges of boards against access of humidity
    • 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 release of formaldehyde from chipboard and fiber board veneered with finishing layers, the chipboard or fiber board belonging to emission class E1.
  • Wood chipboards are wood chip boards that are hot pressed with a synthetic resin glue binder. Due to the size, shape and arrangement of the chips and the amount of synthetic resin, which is generally in the range of 5 to 10%, the properties of the chipboard can be varied widely.
  • the chipboard can be coated with decorative films, primer films and veneers, for example with valuable woods.
  • chipboard In the Federal Republic of Germany, the consumption of chipboard has increased significantly in recent years. While the production of chipboard was 3.4 million cubic meters in 1969, it rose to 4.3 million cubic meters in 1971 and was 6.2 million cubic meters in 1980.
  • Urea resins or aminoplastics are by far the most widely used particle board binders. They are characterized by a favorable price and high strength of the gluing and also enable very short pressing times.
  • the urea resins have the great disadvantage that they release formaldehyde during the use of the particle board, which not only has an unpleasant smell but is also harmful to health, and therefore the use of urea resins as binders is subject to certain restrictions.
  • Chipboard of this emission class (E1) may be used unclad and uncoated without restriction in living rooms (cf. ETB guideline 1980: Guideline on the use of chipboard with a view to avoiding unacceptable formaldehyde concentration in the ambient air, version April 1980, Beuth-Verlag, Berlin, Cologne) .
  • isocyanates have only been used to a small extent as binders for particle boards.
  • Diphenylmethane diisocyanate in particular has proven to be an excellent binder with which plates of high durability can be produced.
  • the price of these products has so far prevented wider use.
  • the published European patent application 0 012 169 describes multilayer, predominantly aminoplast-bonded chipboard or fiberboard which, in an interior, preferably in the middle layer, has an adhesive which does not belong to the group of aminoplasts, for example diisocyanate, as a binder and which is characterized by it that only those binders are used for this interior, the hardening of which is not impaired by the presence of additional formaldehyde-reactive substances, the binders being mixed with these additional substances in the form of ammonia, ammonium carbonate, ureas, thioureas, melamine or dicyandiamide after pressing the plate, existing or released formaldehyde under the influence of moisture and / or heat directly, possibly indirectly via fission products, react to set it.
  • an adhesive which does not belong to the group of aminoplasts, for example diisocyanate
  • the binders being mixed with these additional substances in the form of ammonia, ammonium carbonate, ureas, thioureas,
  • the published European patent application 0 006 486 relates to a process for reducing the formaldehyde release from aminoplast-bonded chipboard or fiberboard, in which urea or other ammonia-releasing substances are released onto the surface of the boards in the hot state immediately after they have been removed from the heating press aqueous solution can be applied.
  • binders can increase the release of formaldehyde from the veneered or otherwise coated panels, depending on the type of coating, type of wood, thickness, cutting direction and production conditions, so that the legal requirements are no longer met.
  • the formaldehyde-reducing effect of the barrier (for example due to the veneer) is lost and is completely masked (cf. Marutzky, R., Mehlhorn, L. and Wenzel, W., 1981: "Recommendations for the use of chipboard in furniture construction", lecture , held at the Mobil Oil AG symposium in Grainau on September 18, 1981). This is particularly true if the formats of the veneered panels or panels are very small (see ETB guidelines).
  • the present invention is therefore based on the object of providing a method according to which it is possible to reduce the formaldehyde release from chipboard and fibreboard with applied finishing layers, the panels themselves belonging to emission class E1, the finishing layers being particularly valuable veneer woods and have been applied using high formaldehyde urea-formaldehyde resins.
  • the above-mentioned object can be achieved in that the boards are treated in a manner known per se with aqueous solutions of urea and / or other compounds which release ammonia, and in that the finishing layers are then treated in a manner known per se be applied.
  • the boards treated according to the invention are preferably veneered with mahogany wood.
  • urea and / or other compounds which release ammonia are used as formaldehyde-reactive substances.
  • ammonia such as, for example, ammonium carbonate
  • the method according to the invention is not intended to reduce the formaldehyde release of the raw panels themselves, since the method according to the invention uses panels of emission class E1, the use of which in construction does not require any further reduction in their formaldehyde emissions.
  • the chipboard acts as a carrier for the formaldehyde scavenger. Due to the spatial separation between the urea-formaldehyde resin and the formaldehyde scavenger, the hardening of the resin takes place undisturbed, while the free formaldehyde is trapped in the plate (cf. discussion of the prior art in DE-PS 28 51 589).
  • the free formaldehyde migrates from the surfaces of the panels into the interior of the panel, where the formaldehyde scavengers are located (cf. the teaching of DE-PS 28 51 589). There the formaldehyde that diffuses into it reacts with the formaldehyde scavengers. In this way, the formaldehyde release of the veneered panels can be drastically reduced.
  • aqueous solutions of urea and / or other compounds which release ammonia are used.
  • the aqueous solutions can have concentrations in the range from 5% to 60%, preferably from 30% to 50%. They are easily manufactured by dissolving the corresponding compounds in water.
  • Ammonium carbonate, ammonium bicarbonate can be used as compounds which release ammonia.
  • Urea mixed with ammonium carbonate is preferably used. The scope of the present invention is not
  • a chipboard of emission class E1 [perforator value 8.0 mg (iodometric) or 6.1 mg (photometric) / 100 g dry plate] was coated with 220 g / m2 of a 50% urea-formaldehyde resin solution (molar ratio 1: 1, 6) coated and then coated with a veneer (mahogany, thickness 0.6 mm).
  • the same panel was sprayed with a 30% urea solution in a Mengo of 100 g / m2 before veneering under the same conditions and then veneered as described.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
  • Laminated Bodies (AREA)

Claims (5)

  1. Procédé de diminution de l'émission de formaldéhyde dans des panneaux de copeaux et de fibres plaqués avec des couches de valorisation les panneaux appartenant à la catégorie d'émission E1 et le collage du placage s'effectuant avec une résine-urée formaldéhyde en tant qu'adhésif, caractérisé en ce que les panneaux sont traités avant le placage d'une manière connue en soi, avec des solutions aqueuses d'urée et/ou d'autres combinaisons éliminant l'ammoniaque et en ce qu'ensuite, les couches de valorisation sont posées d'une manière connue en soi.
  2. Procédé selon la revendication 1, caractérisé en ce que l'on utilise des panneaux de copeaux ou de fibres qui sont combinés avec des résines phénoplastes alcalines ou des résines de diisocyanate.
  3. Procédé selon la revendication 1, caractérisé en ce que le traitement avec les solutions aqueuses est effectué par aspersion.
  4. Procédé selon l'une des revendications précédentes, caractérisé en ce que les solutions aqueuses présentent des concentrations de 5 à 60 %.
  5. Procédé selon l'une des revendications précédentes, caractérisé en ce que l'on utilise, en tant que combinaisons éliminant l'ammoniaque du carbonate d'ammonium, du bicarbonate d'ammonium ou de l'urée mélangée à du carbonate d'ammonium.
EP84114876A 1983-12-07 1984-12-06 Procédé de diminution de l'émission de formaldéhyde, dans des panneaux plaqués, de copeaux ou de fibres agglomérés Expired - Lifetime EP0144985B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84114876T ATE93444T1 (de) 1983-12-07 1984-12-06 Verfahren zur verminderung der formaldehydabgabe von furnierten span- und faserplatten.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3344239A DE3344239C2 (de) 1983-12-07 1983-12-07 Verfahren zur Verminderung der Formaldehydabgabe von mit Veredelungsschichten furnierten Span- und Faserplatten
DE3344239 1983-12-07

Publications (3)

Publication Number Publication Date
EP0144985A2 EP0144985A2 (fr) 1985-06-19
EP0144985A3 EP0144985A3 (en) 1987-11-11
EP0144985B1 true EP0144985B1 (fr) 1993-08-25

Family

ID=6216269

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84114876A Expired - Lifetime EP0144985B1 (fr) 1983-12-07 1984-12-06 Procédé de diminution de l'émission de formaldéhyde, dans des panneaux plaqués, de copeaux ou de fibres agglomérés

Country Status (3)

Country Link
EP (1) EP0144985B1 (fr)
AT (1) ATE93444T1 (fr)
DE (2) DE3344239C2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6821636B2 (en) 2001-03-12 2004-11-23 Akzo Nobel N.V. Method of producing formaldehyde laden layered products having reduced emission of formaldehyde

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3815204A1 (de) * 1988-05-04 1989-11-16 Gruber & Weber Gmbh Co Kg Verfahren zur herstellung von verbundwerkstoffen mit verringerter formaldehydemission
DE3943488C2 (de) * 1989-09-14 1999-05-27 Dieter Ekkehard Dip Autenrieth Verfahren zur Reduzierung bzw. Eliminierung von freiem Formaldehyd mit Carbamaten, die in der kritischen Phase, wenn Formaldehyd freigesetzt wird, auf dem Substrat erzeugt werden
DE4234871C1 (de) * 1992-10-17 1994-03-17 Achim Dr Ing Moeller Verfahren und Vorrichtung zur Herstellung von Holzwerkstoffplättchen
US6749949B2 (en) * 2001-03-12 2004-06-15 Akzo Nobel N.V. Method of producing formaldehyde laden layered products having reduced emission of formaldehyde
EP1368168B1 (fr) * 2001-03-12 2008-10-01 Akzo Nobel Coatings International B.V. Procede permettant de reduire les emissions de formaldehyde issues de produits dotes d'une couche chargee de formaldehyde
EP1944144B1 (fr) * 2007-01-11 2018-05-30 Fritz Egger GmbH & Co. OG Procédé destiné à la fabrication d'un corps de formage contenant de la cellulose
EP2181818A3 (fr) 2008-10-28 2012-08-22 IHD Institut für Holztechnologie Dresden gGmbH Procédé de fabrication de matières premières en fibres de bois et matières premières en fibres de bois ayant des émissions réduites en VOC volatiles
EP4023812A1 (fr) 2020-12-29 2022-07-06 MM BOARD & PAPER GmbH Procédé de fabrication de produits à base de bois en tant que matière première

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5028484B2 (fr) * 1971-12-15 1975-09-16
FI70385C (fi) * 1978-04-28 1991-08-27 Casco Ab Saett att framstaella cellulosabaserade skivmaterial och komposition haerfoer. al och komposition haerfoer
DE2829021C2 (de) * 1978-07-01 1980-08-28 Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V., 8000 Muenchen Verfahren zur Verminderung der Formaldehydabgabe von Spanplatten
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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6821636B2 (en) 2001-03-12 2004-11-23 Akzo Nobel N.V. Method of producing formaldehyde laden layered products having reduced emission of formaldehyde

Also Published As

Publication number Publication date
EP0144985A2 (fr) 1985-06-19
ATE93444T1 (de) 1993-09-15
EP0144985A3 (en) 1987-11-11
DE3344239A1 (de) 1985-08-01
DE3344239C2 (de) 1986-07-24
DE3486202D1 (de) 1993-09-30

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