EP2027979B1 - Procédé de fabrication de plaques en bois conductrices et de telles plaques en bois conductrices - Google Patents

Procédé de fabrication de plaques en bois conductrices et de telles plaques en bois conductrices Download PDF

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Publication number
EP2027979B1
EP2027979B1 EP08014789A EP08014789A EP2027979B1 EP 2027979 B1 EP2027979 B1 EP 2027979B1 EP 08014789 A EP08014789 A EP 08014789A EP 08014789 A EP08014789 A EP 08014789A EP 2027979 B1 EP2027979 B1 EP 2027979B1
Authority
EP
European Patent Office
Prior art keywords
adhesive
wood
use according
based material
protein
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.)
Active
Application number
EP08014789A
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German (de)
English (en)
Other versions
EP2027979A1 (fr
Inventor
Norbert Dr. Kalwa
Dirk Dr. Grunwald
Joachim Prof. Dr. Hasch
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.)
Kronotec AG
Original Assignee
Kronotec AG
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Filing date
Publication date
Application filed by Kronotec AG filed Critical Kronotec AG
Priority to PL08014789T priority Critical patent/PL2027979T3/pl
Publication of EP2027979A1 publication Critical patent/EP2027979A1/fr
Application granted granted Critical
Publication of EP2027979B1 publication Critical patent/EP2027979B1/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
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • 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
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/002—Manufacture of substantially flat articles, e.g. boards, from particles or fibres characterised by the type of binder
    • 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
    • B27N7/005—Coating boards, e.g. with a finishing or decorating layer

Definitions

  • the present invention relates to a process for the production of coated wood-based panels. More particularly, the present invention relates to a process for the preparation of coated wood-based panels made with an adhesive of a phenol-formaldehyde adhesive component and a low molecular weight proteinaceous, preferably natural, component followed by coating these wood-based panels. In a further aspect, the present invention relates to coated wood-based panels which are obtainable by the method according to the invention.
  • the powder coating of wood-based materials is highly topical due to the discussion of solvent emissions in classical painting and their contribution to the greenhouse effect.
  • the powder coating is considered as a welcome alternative to traditional painting, this is first an electrostatically charged paint powder as evenly distributed on the surface to be painted using an electric field and then melted on this surface and connected to a homogeneous, firmly adhering to the surface paint layer.
  • wood-based panels such as MDF panels, are not powder-coatable without appropriate measures in the production of these panels, since the surface resistance of the panels is up to about 10 13-14 ohms.
  • the process of powder coating requires surface resistances of the carrier plates, such as the wood-based panels, of preferably about 10 9-10 ohms. This surface resistance is necessary to achieve a homogeneous powder coating ensure, as well as a sufficient thermal stability of the wood-based panels, to allow the subsequent heating to melt the powder coating.
  • the plate is added to an alkali and / or alkaline earth metal salt for improving the electrical conductivity, for. B. in the form of a saline solution.
  • phenolic adhesive as an adhesive, it already contains, as a condensation aid, larger amounts of alkali salts (up to 20%) which, when used, lead to a sheet having a surface resistance in a desired range.
  • alkali metal salts or ammonium salts are disadvantage with the use of larger amounts of alkali metal salts or ammonium salts.
  • ammonium salts are not thermally stable, so that they are partially destroyed in the hot pressing to the wood-based panel be so that the higher the amount of salt must be added to the plates.
  • alternative salts which are not hygroscopic themselves, but still achieve a reduction in the surface resistance.
  • alkali and / or alkaline earth salts having a neutral pH are used, such as lithium nitrate and sodium nitrate. This process described herein has the disadvantage that the salt in the required amount leads to a significant increase in the cost of the product.
  • the adhesives themselves must be sufficiently thermally stable for a powder coating, otherwise cracks may occur, as with pure UF glue.
  • the invention has for its object under the use of a suitable adhesive coated wood-based panels, such as MDF panels provide that overcome the above-mentioned disadvantages.
  • a suitable adhesive coated wood-based panels such as MDF panels provide that overcome the above-mentioned disadvantages.
  • Important here is that both the economic aspects and the ecological aspects are taken into account, ie that the procedures do not lead to a significant increase in the price of the product, but also do not cause undue stress on the environment and do not seriously alter the previous process control for the production of the wood-based panels.
  • the object of the invention is achieved by a method according to claim 1. Preferred embodiments of this method are described in the subclaims 2 to 9. Furthermore, the invention provides coated wood-based panels preparable according to the inventive method. Preferred embodiments of these coated wood-based panels are set forth in the subclaims 10 to 14.
  • a preform having a major portion of lignocellulosic fibers, shavings or strands is hot-pressed with an adhesive which contributes to increasing the conductivity of the wood-based panel to the wood-based panel and then coated with this panel, using as adhesive a glue is used, which consists of a phenol-formaldehyde adhesive component and a low molecular weight protein-containing, preferably natural component. From these two components, a copolymer is first prepared, which is then used as an adhesive.
  • the adhesive is phenol-formaldehyde adhesive components in which a corresponding low molecular weight, preferably natural, proteinaceous component is added or condensed during adhesive preparation.
  • the amount of proteinaceous components added is in the range of 1 to 40% by mass, based on the phenol-formaldehyde component, such as 4 to 33% by mass, e.g. 10 to 20% by mass.
  • Suitable adhesives are e.g. the additives EXP109 or EXP110 from Dynea Erkner GmbH, Erkner, Germany.
  • the modified adhesive the adhesive of a phenol-formaldehyde adhesive component and a low molecular weight protein-containing natural component (hereinafter referred to as pPF adhesive) alone or in combination with known adhesives used for the production of wood materials
  • pPF adhesive a low molecular weight protein-containing natural component
  • combinations of the pPF adhesive with another adhesive selected from the group consisting of urea-formaldehyde (UF) adhesive, melamine-urea-formaldehyde (MUF) adhesive, a melamine-urea-phenol-formaldehyde Adhesive (MUPF adhesive), a tannin-formaldehyde adhesive, a phenol-formaldehyde adhesive, an isocyanate-based adhesive or a mixture thereof.
  • the adhesive must have a PF adhesive component since the other adhesives alone can not be modified with the proteinaceous component.
  • the pPF adhesive is admixed as a copolymer to the further adhesive and then applied to the fibers, chips or strands.
  • the individual adhesives can also be applied separately. It is also possible that the individual components of the pPF adhesive are added separately to the other adhesive
  • the total amount of adhesive is in the range, as is commonly used in wood materials, for example, the adhesive is present in a proportion of 5 wt .-% to 20 wt .-% of atro fibers, chips or strands.
  • the wood-based materials further contain small amounts of alkali metal, alkaline earth metal or ammonium salts in order to increase the conductivity of the wood-based panel, so that, if required, a surface resistance tailored to the process can be set.
  • the amount of added salt is in a range of 0.1 to 1 wt .-% atro fibers, chips or strands, preferably 0.2 to 0.5 wt .-% atro fibers, chips or strands.
  • Such small amounts lead neither to the dimensional changes described above nor to a significant change in the process control. That the method according to the invention can be designed in accordance with customary process sequences for the production of wood-based panels.
  • the method comprises spraying the fibers, chips or strands with the adhesive and optionally with a solution of the alkali, alkaline earth or ammonium salts and then drying and then heating and compacting the mass to cure the plate ,
  • the coating of the wood-based panel is in one embodiment to a painting of the wood-based panel, in particular, it is according to the invention is a powder coating.
  • This powder coating is carried out according to known methods by electrostatic application.
  • the adhesive and, if necessary, the saline solution can be added as usual via the blowline to the fibers. After scattering of the fibers on the forming belt and precompression, the compression takes place e.g. in a Contipresse.
  • the coated wood-based panels are fiberboards, in particular fiberboards of average density of 750 to 850 kg / m 3 (MDF boards).
  • the wood-based panels are chipboard.
  • Another embodiment relates to wood-based panels which are OSB panels.
  • the coating of the wood-based panels is at least in the range of one of the edges of the wood-based panels. This allows e.g. To obtain a necessary deep-fringe quality for MDF boards.
  • the present invention relates to the obtainable by the process according to the invention coated wood-based panels, which are characterized by a reduced surface resistance and thereby make it possible to paint these wood-based panels using the powder coating to obtain corresponding coated wood-based panels.
  • the invention is powder-coated MDF boards, which are often used in painted form in wet areas or kitchens.
  • the wood-based panel coated according to the invention may also be a fiberboard of a different density, an OSB panel or a chipboard.
  • the coated wood-base panel prior to coating, has a surface resistance in a range of 10 8 to 11 ohms, preferably 10 8 to 10, such as 10 9 to 10 ohms. Due to the small proportion of alkali, alkaline earth or ammonium salts find no significantly larger dimensional changes in the use of plates in the area with increased humidity, eg as a front in the kitchen, or the occurrence of cracks in the coatings instead.
  • a wood-based panel is made as in Example 1, except that the portion of pPF adhesive has been replaced by the urea-formaldehyde adhesive.
  • Table 1 shows the surface resistances of the wood-based panels obtained in Examples 1 to 3.
  • Table 1 Plattenttyp Surface Resistance * Unmated in Mega Ohms Surface resistance * Air-conditioned (20 ° C, 50% relative humidity) in mega ohms Comparative Example 1 87,000 35,000 Plate Example 1 3300 1000 Plate example 2 173 95 Plate Example 3 130 75 *: Measurement according to DIN EN 61340-4-1
  • the surface resistances were determined in unclimatised and conditioned condition (50% relative humidity, 20 ° C).
  • the usual technological values, such as transverse tensile strength, covering layer strength and swelling, are in the upper range of the standard applicable to MDF for furniture application (DIN EN 622 TI.3).
  • Example 2 the obtained MDF boards, see Table 1 above, which were prepared alone with a pPF adhesive (Example 2) or in combination with other adhesives (Example 1), exhibited sufficient conductivity so that powder coating could be carried out without problems , In the subsequent powder coating according to known methods of the wood materials produced in Example 1 to 3 showed homogeneous coating properties without blistering or excessive dimensional change of the wood materials.

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)

Claims (13)

  1. Utilisation d'une colle consistant en une composante de colle phénol-formaldéhyde et une composante à faible poids moléculaire contenant des protéines, la colle étant destinée à augmenter la conductivité électrique de panneaux en matériau dérivé du bois à munir d'un revêtement, pour fabriquer un panneau en matériau dérivé du bois muni d'un revêtement, ce panneau en matériau dérivé du bois étant fabriqué par les étapes suivantes ;
    - préparer une préforme comprenant une part principale de fibres, copeaux et brins contenant de la lignocellulose mélangés à la colle,
    - presser à chaud le panneau en matériau dérivé du bois, et
    - munir d'un revêtement le panneau en matériau dérivé du bols pressé à chaud,
    caractérisée en ce que le panneau en matériau dérivé du bois présente, avant revêtement, une résistance surfacique dans un domaine allant de 108 à 10" Ohm.
  2. Utilisation selon la revendication 1, dans laquelle la composante à faible poids moléculaire contenant des protéines est une composante à faible poids moléculaire contenant des protéines naturelle.
  3. Utilisation selon la revendication 1 ou 2, caractérisée en ce que la composante à faible poids moléculaire contenant des protéines est une composante contenant des protéines de blé, soja, et/ou maïs.
  4. Utilisation selon l'une quelconque des revendications précédentes, caractérisée en ce que les panneaux en matériau dérivé du bols sont des panneaux de fibres.
  5. Utilisation selon la revendication 4, dans laquelle les panneaux de fibres sont des panneaux de fibres ayant une masse volumique apparente moyenne allant de 750 à 850 kg/m3.
  6. Utilisation selon l'une quelconque des revendications précédentes, caractérisée en ce que le revêtement est un laquage du panneau en matériau dérivé du bois.
  7. Utilisation selon l'une quelconque des revendications précédentes, caractérisée en ce que le revêtement est un revêtement par une poudre.
  8. Utilisation selon l'une quelconque des revendications précédentes, caractérisée en ce que l'on asperge de colle les fibres, copeaux ou brins, puis on les sèche, et enfin on chauffe et on presse la masse.
  9. Utilisation selon l'une quelconque des revendications précédentes, caractérisée en ce que l'on introduit la colle dans une proportion allant de 5% à 20% en poids atro de fibres, copeaux ou brins.
  10. Utilisation selon l'une quelconque des revendications précédentes, caractérisée en ce que l'on introduit comme colle une combinaison d'une colle à base i) d'une composante de colle phénol-formaldéhyde et ii) d'une composante à faible poids moléculaire contenant des protéines naturelle, et d'une autre colle choisie parmi un groupe comprenant une colle urée-formaldéhyde, une colle mélamine-urée-formaldéhyde, une colle mélamine-urée-phénol-formaldéhyde, une colle tanin-formaldéhyde, une colle phénol-formaldéhyde, une colle à base d'isocyanates, ou un mélange de celles-ci.
  11. Utilisation selon l'une quelconque des revendications précédentes, caractérisée en ce que l'on met en oeuvre la colle à base i) d'une composante de colle phénol-formaldéhyde et ii) d'une composante à faible poids moléculaire contenant des protéines, en tant que copolymère.
  12. Utilisation selon l'une quelconque des revendications précédentes, dans laquelle on introduit en outre un sel alcalin, alcalinoterreux ou d'ammonium, dans une proportion allant de 0,1 à 1 % en poids atro de fibres, copeaux ou brins.
  13. Utilisation selon la revendication 12, caractérisée en ce que l'on Introduit en outre un sel alcalin, alcalinoterreux ou d'ammonium, dans une proportion allant de 0,2 à 0,5 % en poids atro de fibres, copeaux ou brins.
EP08014789A 2007-08-20 2008-08-20 Procédé de fabrication de plaques en bois conductrices et de telles plaques en bois conductrices Active EP2027979B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL08014789T PL2027979T3 (pl) 2007-08-20 2008-08-20 Sposób wytwarzania przewodzących płyt z tworzywa drzewnego i płyty z tworzywa drzewnego

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102007039267A DE102007039267B4 (de) 2007-08-20 2007-08-20 Verfahren zur Herstellung von leitfähigen Holzwerkstoffplatten und solche Holzwerkstoffplatten

Publications (2)

Publication Number Publication Date
EP2027979A1 EP2027979A1 (fr) 2009-02-25
EP2027979B1 true EP2027979B1 (fr) 2013-03-06

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ID=39746480

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Application Number Title Priority Date Filing Date
EP08014789A Active EP2027979B1 (fr) 2007-08-20 2008-08-20 Procédé de fabrication de plaques en bois conductrices et de telles plaques en bois conductrices

Country Status (4)

Country Link
EP (1) EP2027979B1 (fr)
DE (1) DE102007039267B4 (fr)
ES (1) ES2405315T3 (fr)
PL (1) PL2027979T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2667757C1 (ru) * 2014-11-06 2018-09-24 Флуринг Текнолоджис Лтд. Плита из древесного материала, в частности, в виде древесно-пластикового композитного материала, и способ ее изготовления

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008049132A1 (de) * 2008-09-26 2010-04-08 Flooring Technologies Ltd. Verfahren zum Herstellen einer Holzfaserplatte und Holzfaserplattenherstellvorrichtung
CN103072179A (zh) * 2012-12-28 2013-05-01 青岛华顺昌木工机械制造有限公司 封边机胶锅快速更换装置
EP3017924B8 (fr) * 2014-11-06 2017-03-29 Flooring Technologies Ltd. Procédé de fabrication d'une plaque en matériau dérivé du bois, notamment un composite constitué de bois/plastique
CN105235048A (zh) * 2015-09-25 2016-01-13 华南农业大学 一种高性能木质复合材料及其制备方法和应用
PT3181315T (pt) * 2015-12-16 2020-07-17 SWISS KRONO Tec AG Processo de produção de uma osb com uma superfície lisa

Family Cites Families (10)

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Publication number Priority date Publication date Assignee Title
DE10253455A1 (de) 2001-12-05 2003-06-18 Ihd Inst Fuer Holztechnologie Bindemittel für die Herstellung von quellungsvergüteten Holzwerkstoffen und die Verklebung von Holz und Holzwerkstoffen
DE10232874B4 (de) 2002-07-19 2010-01-28 Ghp Glunz Holzwerkstoffproduktions-Gmbh Platte und Verfahren zur Herstellung einer Platte
DE10344926B3 (de) * 2003-09-25 2005-01-20 Dynea Erkner Gmbh Verfahren zur Herstellung von Holzwerkstoffkörpern, Holzwerkstoffkörper sowie nachverformbarer Holzwerkstoffkörper
US7090897B2 (en) * 2003-10-10 2006-08-15 Hardesty Jon H Electrically conductive MDF surface
DE10354394B4 (de) * 2003-11-20 2005-12-08 Dynea Erkner Gmbh Bindemittel zur Herstellung und Verklebung von Holzwerkstoffen und/oder Faserstoffen und Verwendung desselben
DE102004024566B4 (de) * 2004-03-13 2014-03-13 Institut für Holztechnologie Dresden gGmbH Holzwerkstoff und Verfahren zu dessen Herstellung
WO2006010192A1 (fr) * 2004-07-27 2006-02-02 Orica Australia Pty. Ltd. Système pour fournir un substrat cellulosique reconstitué enduit de poudre
DE202005006966U1 (de) 2004-11-23 2005-07-14 Glunz Ag Elektrisch leitfähige Holzwerkstoffplatte
ITMI20051025A1 (it) * 2005-06-01 2006-12-02 Mauro Soli Soluzione acquosa e metodo per rendere copnduttiva una superficie di un materiale non conduttivo
DE102005061222A1 (de) * 2005-12-20 2007-06-21 Dynea Erkner Gmbh Pflanzliche Faser, Formkörper auf Faserbasis sowie Verfahren zur Herstellung von mit Novolak versehenen pflanzlichen Fasern

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2667757C1 (ru) * 2014-11-06 2018-09-24 Флуринг Текнолоджис Лтд. Плита из древесного материала, в частности, в виде древесно-пластикового композитного материала, и способ ее изготовления

Also Published As

Publication number Publication date
ES2405315T3 (es) 2013-05-30
DE102007039267A1 (de) 2009-02-26
DE102007039267B4 (de) 2013-04-04
EP2027979A1 (fr) 2009-02-25
PL2027979T3 (pl) 2013-07-31

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