EP1793972A1 - Bois ou materiau en bois et procede de fabrication associe - Google Patents

Bois ou materiau en bois et procede de fabrication associe

Info

Publication number
EP1793972A1
EP1793972A1 EP05791387A EP05791387A EP1793972A1 EP 1793972 A1 EP1793972 A1 EP 1793972A1 EP 05791387 A EP05791387 A EP 05791387A EP 05791387 A EP05791387 A EP 05791387A EP 1793972 A1 EP1793972 A1 EP 1793972A1
Authority
EP
European Patent Office
Prior art keywords
wood
fatty acid
particles
treated
solutions
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.)
Withdrawn
Application number
EP05791387A
Other languages
German (de)
English (en)
Inventor
Karsten Aehlig
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.)
IHD Institut fuer Holztechnologie Dresden gGmbH
Original Assignee
IHD Institut fuer Holztechnologie Dresden gGmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by IHD Institut fuer Holztechnologie Dresden gGmbH filed Critical IHD Institut fuer Holztechnologie Dresden gGmbH
Publication of EP1793972A1 publication Critical patent/EP1793972A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
    • B27K3/34—Organic impregnating agents
    • B27K3/38—Aromatic compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
    • B27K3/16—Inorganic impregnating agents
    • B27K3/20—Compounds of alkali metals or ammonium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K2240/00—Purpose of the treatment
    • B27K2240/15—Decontamination of previously treated wood

Definitions

  • Wood or wood-based material process for their preparation
  • the invention relates to wood or wood-based materials, in particular fatty acid esterhalt ⁇ gen woods that have no malodour caused by degradation products of the fatty acid esters and methods for their preparation.
  • Wood materials are z. B. plywood but also chip, fiber, MSB and OSB boards, which are made of wood particles by pressing with binders.
  • the woods are according to the invention timbers and solid wood panels.
  • the products according to the invention are used in a wide variety of fields.
  • VOC volatile organic compounds
  • VOCs can be done as a sum parameter (total VOC concentration) and, depending on voluntary agreements (eco-labels and other quality labels), a certain concentration of VOCs should not be exceeded.
  • "hazardous" substances which include, in particular, CMT substances of category 1 and 2. Since October 2004, emission from construction products has been toxicologically assessed according to the AgBB scheme based on NIK values (lowest concentration of interest) Exceeding the toxicological limit R of 1 will result in the non-approval of the construction product subject to registration, and it is clear that other interior products are also increasingly being subjected to this assessment.
  • Selected woods such as pine, birch, spruce linden or poplar contain fatty acid esters that are used in the manufacture of aldehydes and organic products Acids can be degraded without this can be prevented by changing technological parameters. Own investigations have shown that z. B. in birch 2315 mg / kg, linden 7544 mg / kg, pine 5807 mg / kg or spruce 1894 mg / kg of fatty acids may be included.
  • odor-intensive compounds Both classes of compounds, aldehydes and organic acids, are odor-intensive. For consumers, products with increased emissions of odor-intensive compounds have a negative impact, causing complaints and also adverse health effects, solely due to the smell.
  • the odor thresholds in these compounds may be 20 ⁇ g / m 3 and below.
  • wood particles chips, fibers and OSB strands
  • fatty acid ester-containing woods such as.
  • pine it comes during the manufacturing process, especially during drying, to form odorous as well as toxicologically harmful compounds.
  • wood particles of fatty acid wood are the basis for the production of wood-based materials and wood-based materials are increasingly subject to residential hygiene requirements, such wood materials, which emit in particular saturated and unsaturated aldehydes, organic acids and other odorous compounds, difficult to deduct.
  • the unsaturated fatty acid esters are split by the effect of temperature (up to about 700 0 C drier inlet temperature).
  • temperature up to about 700 0 C drier inlet temperature.
  • odor-intensive aldehydes and organic acids as well as toxicologically relevant unsaturated aldehydes are formed.
  • wood or wood-based materials that emit fission products of fatty acid esters only in very small amounts barely perceptible odor and to provide methods for their preparation.
  • the object is achieved by wood or wood-based materials, in particular wood containing fatty acid esters, which have no malodour caused by degradation products of the fatty acid esters and emit unsaturated aldehydes in a concentration of not more than 2 ⁇ g / m 3 .
  • This is achieved by cleaving, inhibiting or oxidizing the already contained fatty acid esters during their production.
  • Malodor means an odor impression, which is generally perceived as unpleasant and leads to product rejection or irritation.
  • Degradation products of the fatty acid esters are in particular organic acids such as propionic, butanoic and hexanoic acid and / or aldehydes such as propanal, hexanal, nonanal, 2-octenal, heptenal, decenal or octanal.
  • the degradation products of the fatty acid esters propanal, hexanal, propionic acid, butyric acid and hexanoic acid cause a false odor.
  • the odor thresholds in these compounds are 20 ⁇ g / m 3 and below.
  • Unsaturated aldehydes, such as. B. 2-octenal, decenal, heptenal or Nonenal set the woods or wood materials according to the invention in a maximum concentration of 2 ug / m 3 free.
  • the fatty acid ester-containing woods include wood species such as pine, birch, linden or poplar.
  • Wood materials according to the invention are chip, fiber, MSB and OSB boards which are produced from wood particles by compression with binders and also plywoods.
  • the woods are according to the invention timbers and solid wood panels.
  • According to the invention contains the wood or the wood material
  • alkaline compounds such as sodium carbonate, or ammonia or alkalis
  • oxidizing agents such as sodium dithionite or hydrogen peroxide wood or treated wood particles.
  • the wood or wood-based material contains antioxidants in a concentration of at least 0.1 ⁇ g / ml of ascorbic acid equivalent.
  • the woods or wood-base materials according to the invention can be produced by a process in which fatty acid esters contained in the wood or in the wood particles are already inhibited, split or oxidized during the drying of freshly cut solid wood or during or after the production of the wood particles.
  • the advantages of the method according to the invention are that either by inhibiting the cleavage of the fatty acid esters by antioxidants or phenolic extractives, the cause of the formation of odorous toxicologically harmful compounds is largely prevented or by the cleavage or oxidation (by means of fatty acid ester decomposing oxidant) of the fatty acid esters already In the manufacturing process, the odor-intensive, toxicologically questionable compounds are formed and eliminated immediately, so that they can no longer be emitted later from wood or wood-based material.
  • the wood particles or the solid wood are treated with antioxidants, for example salts of gallic acid, citrates or 2,6-di-tertiary-butyl-4-methyl-phenol (BHT) or solutions thereof.
  • antioxidants for example salts of gallic acid, citrates or 2,6-di-tertiary-butyl-4-methyl-phenol (BHT) or solutions thereof.
  • BHT 2,6-di-tertiary-butyl-4-methyl-phenol
  • the solid wood or wood particles are treated with fatty acid ester decomposing chemicals or their solutions prior to drying.
  • alkaline compounds such as sodium carbonate or sodium dithionite-containing solutions or alkalis or ammonia are used. The treatment is carried out by soaking the wood particles with the appropriate solutions. During drying, the resulting fission products are removed via the dryer exhaust air and thus no longer emit from wood or wood-based materials.
  • phenolic extractives of wood or bark are used to treat the solid wood or the wood particles.
  • barks or wood containing tannin are extracted and the extraction solution is associated with the wood particles or the solid wood in a suitable form.
  • the wood particles or the solid wood can be dipped for a short time or the extraction solution can be applied to the particles or the solid wood by spraying before drying.
  • the process results in a wood or wood-based material without malodour due to breakdown products of the fatty acid esters. Furthermore, the wood thus produced or the wood particles thus produced emit unsaturated aldehydes at a maximum concentration of 2 ⁇ g / m 3 .
  • the Kiefemstrands are comminuted to a particle size ⁇ 1, 5 mm and determined by headspace gas chromatography, the contents of saturated and unsaturated aldehydes.
  • 1 shows a gas chromatogram of an untreated pine wood sample dried at 220 ° C.
  • FIG. 2 shows a gas chromatogram of the pine wood sample treated with gallic acid propyl ester before drying and subsequently dried at 220 ° C.
  • the wood material sample is 48 hours at 23 0 C and 65% rel. Humidity conditioned.
  • 50 g of sample material are placed in a tightly closed odorless 11-glass vessel and stored for 24 hours at 23 0 C.
  • the odor test is carried out in accordance with the VDA recommendation 270 with a panel of probands of at least 5 test persons on 3 samples each. There is an odor assessment in 6 notes.
  • Grade 1 imperceptible; Grade 2 - perceptible / not disturbing; Grade 3 - clearly perceptible but not disturbing Grade 4 - disturbing; Grade 5 - very disturbing; Grade 6 - unbearable
  • the smell test shows whether the smell is product-typical, not disturbing or whether a non-product-typical disturbing smell emanates from the product.
  • the initial temperature is 220 0 C.
  • hexanal and octanal contents could be reduced by 65 to 80% compared to untreated samples.
  • the treated beach sample gave an odor rating of 3.0 (more noticeable, not yet offensive odor).
  • the treated with propyl gallate under laboratory conditions pine strands (drying at 220 0 C) were bonded single layer under laboratory conditions with a polymeric isocyanate adhesive (PMDI) under known pressure conditions.
  • the OSB laboratory plates measuring 500 mm x 500 mm x 20 mm were stored in a 1 m 3 test chamber to determine VOC emission and emissions were determined after 24 hours and 28 days. The odor determination was carried out according to the method already described. The following table shows selected results.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)

Abstract

L'invention concerne du bois ou des matériaux en bois, réalisés notamment à partir de bois contenant des esters d'acide gras, ces matériaux ne développant pas de mauvaises odeurs provoquées par des produits de dégradation des esters d'acide gras et dégageant des aldéhydes insaturés dans une concentration maximale de 2 ?g/m<SUP>3</SUP>. Selon l'invention, lors de la fabrication desdits matériaux, les esters d'acide gras contenus sont désintégrés, inhibés ou oxydés.
EP05791387A 2004-09-21 2005-09-21 Bois ou materiau en bois et procede de fabrication associe Withdrawn EP1793972A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004046606 2004-09-21
PCT/DE2005/001717 WO2006032267A1 (fr) 2004-09-21 2005-09-21 Bois ou materiau en bois et procede de fabrication associe

Publications (1)

Publication Number Publication Date
EP1793972A1 true EP1793972A1 (fr) 2007-06-13

Family

ID=35241215

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05791387A Withdrawn EP1793972A1 (fr) 2004-09-21 2005-09-21 Bois ou materiau en bois et procede de fabrication associe

Country Status (2)

Country Link
EP (1) EP1793972A1 (fr)
WO (1) WO2006032267A1 (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007055415C5 (de) * 2007-11-19 2018-11-29 SWISS KRONO Tec AG Verfahren zur Verminderung der Emission von gesättigten und ungesättigten Aldehyden aus Holzwerkstoffen
DE102008020642A1 (de) 2008-04-24 2009-10-29 Kronotec Ag Verfahren zur Herstellung von Holzwerkstoffen und Holzwerkstoffe
DE102009000109A1 (de) 2008-06-27 2009-12-31 BAM Bundesanstalt für Materialforschung und -prüfung Verfahren zur Emissionsminderung von Holz und Holzwerkstoffen
DE102009046127A1 (de) 2008-10-28 2010-04-29 Institut Für Holztechnologie Dresden Gemeinnützige Gmbh Verfahren zur Herstellung von Holzfaserwerkstoffen sowie Holzfaserwerkstoffe mit verringerter Emission an flüchtigen VOC
EP2546038B1 (fr) * 2011-07-12 2015-04-01 Kronotec AG Procédé destiné à la réduction de l'émission de composés organiques liquides à partir de matières dérivées du bois
EP2607032B1 (fr) 2011-12-19 2020-01-22 SWISS KRONO Tec AG Procédé destiné à la réduction de l'émission de composés organiques liquides à partir de matières dérivées du bois et matières dérivées du bois
DE102012020842B4 (de) 2012-10-24 2017-06-29 Fritz Egger Gmbh & Co. Og Verfahren zur Herstellung eines Holzwerkstoffs
ES2529356T3 (es) 2012-11-06 2015-02-19 Kronotec Ag Procedimiento para reducir la emisión de compuestos orgánicos volátiles procedentes de derivados de la madera y derivados de la madera
DE102013001678A1 (de) 2013-01-31 2014-07-31 INNOLYSIA GbR (vertretungsberechtigte Gesellschafterin: Virginie Soua, 53639 Königswinter) Reduzierung der Schadstoffemission von Holzwerkstoffen
EP4023813A1 (fr) * 2020-12-29 2022-07-06 Technische Universität Wien Procédé de fabrication de produits à base de bois comme matière première
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
GB191108468A (en) 1911-04-05 1911-10-26 Konstantin Koenman Process for the Preservation of Wood.
US3282313A (en) 1964-11-24 1966-11-01 Research Corp Method of forming wood and formed wood product
DD255607A1 (de) 1986-10-29 1988-04-06 Pentacon Dresden Veb Schaltungsanordnung fuer bildschirm-aufnahmen
DD257607A1 (de) 1987-02-17 1988-06-22 Wtz Holzverarbeitende Ind Verfahren zum chemischen faerben von furnieren

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2006032267A1 *

Also Published As

Publication number Publication date
WO2006032267A1 (fr) 2006-03-30

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