EP1817145B1 - Panneaux en materiau derive du bois de couleur claire a blanche - Google Patents

Panneaux en materiau derive du bois de couleur claire a blanche Download PDF

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Publication number
EP1817145B1
EP1817145B1 EP05797299.4A EP05797299A EP1817145B1 EP 1817145 B1 EP1817145 B1 EP 1817145B1 EP 05797299 A EP05797299 A EP 05797299A EP 1817145 B1 EP1817145 B1 EP 1817145B1
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EP
European Patent Office
Prior art keywords
wood
fibers
mdf
white
weight
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
EP05797299.4A
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German (de)
English (en)
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EP1817145A1 (fr
Inventor
Andres Carlos Garcia Espino
Juliane Krüsemann
Manfred Siegler
Norbert Jäger
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BASF SE
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BASF SE
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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
    • 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
    • B27N3/04—Manufacture of substantially flat articles, e.g. boards, from particles or fibres from fibres

Definitions

  • the present invention relates to light to white wood-based panels, which are MDF, HDF or particle board, which are mass-colored with a white pigment and optical whitening agents are added.
  • MDF panels medium-density fiberboards
  • HDF panels high-density fibreboards
  • MDF and HDF boards can be processed like conventional chipboard. Due to their uniform structure, they are also suitable for the production of profiled parts and are therefore becoming increasingly popular in furniture construction. Thus, for example, furnishings for rooms and for decorative purposes (for example, in trade fair construction), but also higher-quality furniture made from these plates and then, in order to preserve the wood-like structure visible, only colorless or coated with overlay.
  • the wood fibers used in the production of MDF boards contain substances which are sensitive to oxidation and thus to discoloration (for example lignin), which are no longer present in the paper pulp.
  • MDF boards are made at much higher temperatures (about 200 ° C) than paper, which adds to the brownish inherent color of the wood fibers a process-related browning due to the oxidation and thermal decomposition of wood constituents.
  • the light exposure of a MDF board incorporated in furniture is significantly longer and more intense than the usual papers and causes a not inconsiderable yellowing.
  • the invention therefore an object of the invention to provide light or white wood-based panels available.
  • This object is achieved by bright to white wood-based panels, which are MDF, HDF or chipboard, characterized in that the curing to white wood-based panels are mass-colored with a white pigment and optical brighteners are added.
  • the invention also includes such light to white wood-based panels made of bleached wood fibers and wood-based panels of the invention made from wood fibers which have been first bleached oxidatively and then reductively.
  • the wood-based panels according to the invention are distinguished by their brightness or their white color. Depending on the combination of measures taken, the desired whiteness can be easily adjusted. Especially white plates are e.g. by bleaching the wood fibers and mass-coloring with a dispersion of a white pigment which additionally contains optical brighteners. Bright plates with a lower degree of whiteness are also accessible merely by bleaching the wood fibers or by mass coloration with a white pigment.
  • the wood-based panels according to the invention are MDF or HDF boards or chipboards. Particularly preferred are MDF boards.
  • MDF and HDF boards are usually produced in a continuous process. This washed, water-moist, small chopped pieces of wood (wood chips) are first preheated to about 80 ° C and then in a digester under a pressure of 2 to 5 bar and a temperature of 100 to 150 ° C geweicht. In the adjoining refiner, the chips are then shredded.
  • the refiner consists of two metal discs with radial relief, which rotate close to each other in the opposite direction. The fibers leave the refiner via the so-called blowline. Here, the glue is usually applied.
  • binders are usually urea-formaldehyde resins, reinforced in part with melamine, or for moisture-resistant Sheets urea-melamine-formaldehyde resins used. Isocyanates are also used as binders.
  • the binders are usually applied to the fibers together with the desired additives (eg hardener, paraffin dispersion, colorant).
  • the glued fibers then pass through a dryer in which they are dried to humidities of 8 to 15 wt .-%. Occasionally, the dried fibers are coated only later in special continuously operating mixers.
  • the glued fibers or chips are then poured into mats, optionally cold precompressed and pressed in heated presses at temperatures of 170 to 240 ° C to plates.
  • bleached wood fibers hereinafter is not differentiated between the terms “wood fibers” and “chips”, but should the term “wood fibers” include “chips" used.
  • the coloring impurities of the wood are destroyed or rendered ineffective by oxidizing and / or reducing chemicals.
  • oxidative bleaching e.g. Hydrogen peroxide, ozone
  • reductive bleaching e.g.
  • reducing sulfur compounds such as dithionites, disulfites, sulfites or sulfur dioxide, sulfinic acids and their salts, in particular the alkali metal salts and especially the sodium salts, and hydroxycarboxylic acids, such as citric acid and malic acid, suitable.
  • Preferred reducing agents are the disulfites and sulfites, in particular sodium hydrogen sulfite, as well as malic and citric acid.
  • wood fibers which have been firstly oxidatively and then reductively bleached are particularly preferred.
  • the oxidative bleaching is carried out with percarbonates or hydrogen peroxide and the reductive bleaching with sulfites, malic or citric acid.
  • the bleaching is advantageously carried out so that aqueous, 5 to 40 wt .-% wood fiber dispersions continuously in countercurrent towers at temperatures of 90 to 150 ° C and pushers up to 3 bar with aqueous solutions or dispersions of the bleaching agents.
  • it is carried out in the presence of complexing agents, such as EDTA, to avoid the degradation of the bleaching agents by transition metal ions.
  • the bleaching of the fibers is carried out in particular in MDF / HDF boards during board production.
  • the bleaching agents can be added to the wood chips in the preheater or in the cooker.
  • complexing agents are also added.
  • all fibrous materials to be obtained from plants can serve as the base material for the wood-based panels according to the invention.
  • Preferred base materials are light wood species, especially spruce or pine, but darker woods such as beech can also be used.
  • the use of bleached wood fibers with a mass coloration is combined with a white pigment.
  • the whiteness can be significantly improved.
  • the mass coloration with the white pigment can also be carried out alone. In this case, bright plates are also obtained.
  • white pigments includes both inorganic pigments, which are preferred, such as titanium dioxide (rutile, CI Pigment White 6), calcium carbonate and calcium / magnesium mixed carbonates (eg dolomite), zinc oxide, zinc sulfide, lithopone and sodium aluminum silicate , as well as white-coloring, highly light-scattering plastic emulsions and dispersions.
  • titanium dioxide rutile, CI Pigment White 6
  • calcium carbonate and calcium / magnesium mixed carbonates eg dolomite
  • zinc oxide zinc oxide
  • zinc sulfide lithopone and sodium aluminum silicate
  • white-coloring, highly light-scattering plastic emulsions and dispersions is particularly preferred.
  • white pigments is titanium dioxide.
  • mixtures of white pigments can be used.
  • the white pigments are preferably used in the form of aqueous dispersions in which they are finely divided, since they can be introduced via the blowline, separately from or together with the glue, directly into the MDF / HDF production process.
  • pigment dispersions may contain other customary auxiliaries, in particular wetting and dispersing agents, defoamers and biocides, but also anti-settling agents, water retention agents and rheology modifiers and are preferably prepared by wet milling of all components, for example in a stirred ball mill.
  • a further increase in the whiteness can be achieved by adding optical brighteners, which compensate for their bluish fluorescence (complementary color) graying and yellowing.
  • Suitable are, in principle, all blue emitting fluorescent dyes, more commercially accessible products such as Ultraphor ® (BASF), Leucophor ® (Clariant) or Tinopal ® (Ciba), linked from the chemical substance classes of the stilbenes, distyrylbiphenyls, coumarins, naphthalimides and double bonds benzoxazole and benzimidazole systems.
  • Ultraphor ® BASF
  • Leucophor ® Clariant
  • Tinopal ® Tinopal ®
  • optical brighteners can be introduced in the form of aqueous dispersions or solutions together with the white pigments and the glue in the MDF / HDF manufacturing process.
  • the concentration in the finished wood-based panel is generally from 0.01 to 1% atro, preferably from 0.08 to 0.2% atro.
  • any resulting from the inventive measures changes in the physical properties of the pressed wood-based panel can be controlled by choosing the glue quality and amount of glue.
  • the brightness difference .DELTA.L was determined as compared to an MDF plate made analogously from unbleached wood fibers and without the addition of white pigments and optical brighteners as standard.
  • the ennobled fibers were then poured into a mat, precompressed cold and pressed at 190 ° C to a plate.
  • an MDF board was produced from unbleached wood fibers (spruce), the wood chips containing the white pigment titania containing the white pigment listed in Table 2 being sprayed.
  • Table 2 glue batch Urea-melamine-formaldehyde resin. 69 wt .-% in water 100.0 parts by weight. Paraffin dispersion, 60% strength by weight in water 4.1 parts by weight. Titanium dioxide preparation, 70% strength by weight in water 39.4 parts by weight. water 9.8 parts by weight. Solid resin content of the liquor 45% Solid resin / atro fibers 14% Titanium dioxide / atro fibers 5.6% Fleet on 100 kg of atro fibers 31.1 kg
  • Wood chips from spruce wood were added during the MDF production process in the digester of an MDF pilot plant with a 40 wt .-% aqueous sodium disulfite solution, corresponding to 7.5% sodium hydrogen sulfite atro fibers.
  • the glued wood fibers were dried in the subsequent continuous dryer to a residual moisture content of about 9 wt .-% and then poured discontinuously to a mat, cold precompressed and at 190 ° C with a pressing time factor of 15 s / mm to a 16 mm thick plate pressed.
  • Wood chips from spruce wood were sprayed in a mixer with a 40 wt .-% aqueous sodium disulfite solution, corresponding to 4.5% sodium hydrogen sulfite atro fibers sprayed. These chips were then placed in the digester of an MDF pilot plant fed. The MDF production process was continued as usual with a throughput of 21 kg / h, the chips were defibered by the refiner, and the sustaining fibers were continuously glued by the blowline with the glue formulation containing white pigment titania as shown in Table 6.
  • Table 6 glue batch Urea-melamine-formaldehyde resin, 66.5% by weight in water 100.0 parts by weight. Paraffin dispersion, 60% strength by weight in water 4.0 parts by weight. Titanium dioxide preparation, 70% strength by weight in water 47.5 parts by weight: Solid resin content of the liquor 44% Solid resin / atro fibers 14% Fleet on 100 kg of atro fibers 31.8 kg
  • the glued wood fibers were dried in the subsequent continuous dryer to a residual moisture content of about 9 wt .-% and then poured discontinuously to a mat, cold precompressed and at 190 ° C with a pressing time factor of 15 s / mm to a 16 mm thick plate pressed.
  • Wood chips from beech wood were added during the MDF production process in the digester of an MDF pilot plant with a 40 wt .-% aqueous sodium disulfite solution, corresponding to 6% Natriumhydrogensulfit atro fibers.
  • the MDF production process was continued as usual with a throughput of 30 kg / h, the chips were defibered by the refiner, and the obtained fibers were coated by the blowline continuously with the glue batch listed in Table 8 Table 8 glue batch Urea-melamine-formaldehyde resin, 66.5% by weight in water 100.0 parts by weight. Paraffin dispersion, 60% by weight in water 4.0 parts by weight. water 47.5 parts by weight. Solid resin content of the liquor 44% Solid resin latro fibers 14% Fleet on 100 kg of atro fibers 31.8 kg
  • the glued wood fibers were dried in the subsequent continuous dryer to a residual moisture content of about 9 wt.% And then poured discontinuously into a mat, cold precompressed and pressed at 190 ° C with a pressing time factor of 15 s / mm to a 16 mm thick plate ,
  • an MDF board was produced using the glue formulation listed in Table 9.
  • Table 9 glue batch Urea-melamine-formaldehyde resin, 66.5% by weight in water 100.0 parts by weight. Paraffin dispersion, 60% strength by weight in water 4.0 parts by weight. Titanium dioxide preparation, 50 wt.% In water, containing 2 wt .-% of a commercially available optical brightener 47.5 parts by weight. Solid resin content of the liquor 44% Solid resin / atro fibers 14% Titanium dioxide / atro fibers 5% optical brightener / atro fibers 0.2% Fleet on 100 kg of atro fibers 31.8 kg

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  • 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)

Claims (3)

  1. Panneaux en matériau dérivé du bois de couleur claire à blanche, qui sont des panneaux MDF, HDF ou de particules, caractérisés en ce que les panneaux en matériau dérivé du bois de couleur claire à blanche sont colorés en masse avec un pigment blanc et des azurants optiques leur sont ajoutés.
  2. Panneaux en matériau dérivé du bois selon la revendication 1, qui sont fabriqués à partir de fibres de bois blanchies.
  3. Panneaux en matériau dérivé du bois selon la revendication 1 ou 2, qui sont fabriqués à partir de fibres de bois qui ont été tout d'abord blanchies par oxydation, puis par réduction.
EP05797299.4A 2004-10-14 2005-10-08 Panneaux en materiau derive du bois de couleur claire a blanche Expired - Lifetime EP1817145B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004050278A DE102004050278A1 (de) 2004-10-14 2004-10-14 Helle bis weiße Holzwerkstoffplatten
PCT/EP2005/010848 WO2006042651A1 (fr) 2004-10-14 2005-10-08 Panneaux en materiau derive du bois de couleur claire a blanche

Publications (2)

Publication Number Publication Date
EP1817145A1 EP1817145A1 (fr) 2007-08-15
EP1817145B1 true EP1817145B1 (fr) 2015-12-30

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EP05797299.4A Expired - Lifetime EP1817145B1 (fr) 2004-10-14 2005-10-08 Panneaux en materiau derive du bois de couleur claire a blanche

Country Status (7)

Country Link
US (1) US20070256804A1 (fr)
EP (1) EP1817145B1 (fr)
JP (1) JP2008516793A (fr)
CN (1) CN100546783C (fr)
BR (1) BRPI0515996A (fr)
DE (1) DE102004050278A1 (fr)
WO (1) WO2006042651A1 (fr)

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WO2022003173A1 (fr) 2020-07-02 2022-01-06 Bols Christian Marie Composition adhésive et procédé pour la fabrication de panneaux de fibres ou de particules eco-performants et de couleur brillante ou blanche

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WO2022003173A1 (fr) 2020-07-02 2022-01-06 Bols Christian Marie Composition adhésive et procédé pour la fabrication de panneaux de fibres ou de particules eco-performants et de couleur brillante ou blanche
BE1028461A1 (fr) 2020-07-02 2022-02-01 Bols Christian Marie Procédé d'encollage à sec pour la fabrication de panneaux de fibres ou de particules éco-performants et de couleur brillante, ou blanche

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CN101039784A (zh) 2007-09-19
US20070256804A1 (en) 2007-11-08
DE102004050278A1 (de) 2006-04-27
CN100546783C (zh) 2009-10-07
WO2006042651A1 (fr) 2006-04-27
JP2008516793A (ja) 2008-05-22
EP1817145A1 (fr) 2007-08-15
BRPI0515996A (pt) 2008-08-19

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