WO2009156231A1 - Procédé pour réduire les émissions des matériaux en bois et à base de bois - Google Patents

Procédé pour réduire les émissions des matériaux en bois et à base de bois Download PDF

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Publication number
WO2009156231A1
WO2009156231A1 PCT/EP2009/056097 EP2009056097W WO2009156231A1 WO 2009156231 A1 WO2009156231 A1 WO 2009156231A1 EP 2009056097 W EP2009056097 W EP 2009056097W WO 2009156231 A1 WO2009156231 A1 WO 2009156231A1
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WO
WIPO (PCT)
Prior art keywords
wood
tartaric acid
acid
tartrates
materials
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PCT/EP2009/056097
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German (de)
English (en)
Inventor
Katharina Wiegner
Oliver Jann
Olaf Wilke
Harald Scheffer
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BAM Bundesanstalt für Materialforschung und -prüfung
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
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Priority to EP09769080A priority Critical patent/EP2300202A1/fr
Publication of WO2009156231A1 publication Critical patent/WO2009156231A1/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
    • B27N1/00—Pretreatment of moulding material
    • B27N1/003—Pretreatment of moulding material for reducing formaldehyde gas emission
    • 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
    • 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

Definitions

  • the invention relates generally to the field of making wood products and solid wood products.
  • the invention relates to a process for the production of wood-containing intermediates for further processing into wood-based materials and solid wood products.
  • the invention also novel novel wood-containing intermediates and derived wood materials and solid wood products.
  • Wood materials and solid wood products are widely used today and are found in many everyday products, e.g. in the manufacture of furniture, buildings or parts of buildings, or toys, to name just a few uses. Naturally, the products of wood-based materials and solid wood are mostly and for a long time in the immediate vicinity and environment of humans and animals, e.g. in the case of wooden furniture, construction wood, wall, floor and ceiling coverings preferred especially in confined spaces.
  • a particularly important requirement of wood-based materials and solid wood products or products containing them is therefore sufficient compatibility to preclude health hazards or impairments.
  • emissions of such pollutants play an important role, e.g. Effects on the health of humans and animals can have or can be perceptible to smell and are thus perceived as annoying.
  • VOC volatile organic compounds
  • SVOC semivolatile organic Compounds
  • NIK values are relatively small for aldehydes and in particular unsaturated aldehydes, ie even low emissions can lead to a rejection of the construction product. Therefore, it is important to reduce the emission of pollutants from wood products, especially aldehyde emissions.
  • Aldehydes are volatile organic compounds that are perceptible to the smell of odor and, above all, can be hazardous to health in larger concentrations. This applies in particular to unsaturated aldehydes.
  • WO 06/032267 a process is described for the treatment of wood or wood particles with the aim to reduce a release of unsaturated aldehydes.
  • a 1.5% sodium citrate solution and a 1% octyl ester gallate acid dispersion have been used.
  • the use of these solutions actually resulted in a reduction in aldehyde emission, however, a relevant residual emission is still detectable.
  • the object of the invention is to provide improved methods and means enabling the emission of pollutants, such as e.g. aldehydes and / or terpenes, from HoIz materials and solid wood products or their intermediates to further reduce.
  • pollutants such as e.g. aldehydes and / or terpenes
  • This object is achieved by the invention by providing a process for the production of wood-containing intermediates for further processing into wood-based materials and solid wood products.
  • This process comprises the following steps: a) use of wood-containing starting materials, b) wetting of the wood-containing starting materials with a solution containing tartaric acid and / or tartaric acid tartrate.
  • Wood materials in the context of the present invention are composed of wood layers of different thickness, these wood layers containing wood particles. Such wood particles may be wood strips, wood chips or wood fibers of the same or different woods, a certain size or different size.
  • plate-shaped or strand-shaped wooden materials are produced by mixing the various types of wood particle with natural and synthetic binders and optionally adding further additives, for example water repellents, in the course of a subsequent hot pressing.
  • wood-based materials are:
  • Plywood As plywood or plywood wood panels are called, which consist of several superimposed veneer or board layers. The layers are glued to each other rotated by 90 ° or can be parallel. The fibers of the visible surfaces run parallel on both sides. The number of veneer layers is therefore mostly odd. In some areas, however, glueing has been in progress for some time. This is done so as not to get into a cross-veneered surface during regrinding (for example in the case of stairs). Only today's quality of glues allows such a construction.
  • Composite panels In this case, they are multi-layered materials.
  • Wood-chip materials such as chipboard, chipboard and fiberboard: - Chipboard, also OSB (English: oriented Strand (or structural) board)
  • OSB - slab of oriented chips
  • OSB are multilayer boards made from long, slender shavings (strands). These chips preferably have an average length of 2 to 20 cm.
  • the preparation of the OSB boards is usually done in processes comprising the following steps:
  • Chip preparation The strands or shavings are cut lengthwise from the debarked roundwood by rotating knives.
  • Gluing The adhesive is applied finely distributed to the chips.
  • Scattering The about 20-200 mm long, 10-50 mm wide and 0.6-1, 5 mm thick chips are scattered in the throwing process longitudinally and transversely oriented so that they are arranged crosswise in usually three layers.
  • the strands are mostly made on continuous presses. • Possibly. then re-drying the pressed plates.
  • PF adhesives phenoplast
  • MUPF adhesives melamine-urea-phenol-formaldehyde
  • urea-formaldehyde adhesive urea-formaldehyde adhesive
  • UF adhesive for short
  • melamine-containing urea adhesives MUF adhesives for short
  • PMDI adhesives Polymeres Diphenylmethane diisocyanate
  • the proportion of PMDI predominates. Very often in the middle layer PMDI is used and in the outer layers MUF or MUPF adhesives.
  • MDF Medium Density Fiberboard
  • the woodchips then enter the hydrochemical pretreatment in a predampening tank, then in the digester and then in the refiner (shredder).
  • the shredded fabric is blown out of the refiner via an adjustable "blow valve" through the "blow pipe".
  • the refiner also has six to ten bar steam pressure. The steam forms the transport means for the fibers on their way through the blow pipe into the dryer.
  • Fibrous material with about 5-10% wood moisture in cyclones separated from the air flow Fibrous material with about 5-10% wood moisture in cyclones separated from the air flow.
  • gluing Three types of gluing are distinguished: mixer gluing, blow-line gluing, dry gluing.
  • Fiber direction In most of today's MDF plants, the fibers are cleaned after the drying process (or, if available, only after re-lamination) in a fiber separator. The fibers are placed in a stream of air and freed as far as possible either by vortex formation, sharp deflections, impact vision, Steigluftsichtung or a combination of several effects of heavy particles (glue lump, rubber, metal). Subsequently, the fibers are again separated by cyclone from the air flow and fed to the forming station. • Forming and pressing: Scattering: The scattering station consists of one
  • Forming line After the scattering station, the fiber mat is weighed and the fiber moisture is measured. The shaping then passes into the pre-press. Here, the formation is reduced in the cold pre-compaction in thickness, so that the hot presses can be fed more efficiently and the risk of damage to the moldings is reduced.
  • the pre-compaction in the run is usually worked with belt pre-pressing, according to the principle of the conveyor belt (rarely with apron pre-presses, according to the principle of the tank chain, or with Walzenbandvorpressen, according to the principle of pyramid stone transport with round timbers).
  • Prepress follows the mat trimming, in which side strips are separated from the fiber mat, so that the corresponding desired plate width can be produced.
  • Other measuring devices for density control or metal detection may follow.
  • a Mattenbesprühung to improve the surface qualities or acceleration of the Mattwartissermung can follow.
  • Hot Press This is followed by the hot pressing, where clocked or continuously worked. Fiberboard is made on calender presses. The compression takes place here with press rolls and an outer band on a heated calender roll.
  • chipboard is mainly produced from wood residues and thinnings. Different wood particles are used, which can differ in the type of wood as well as in the particle size.
  • the actual production process comprises the steps: comminution (cutting) of the wood to desired wood particles; Drying of the wood particles; gluing; pressing; optionally a subsequent drying step of the chipboard.
  • adhesives wood glues and cement milk are used to connect the chips and various wetting and separating agents for the pressing process.
  • Thermowood is the end product of a thermal treatment of wood.
  • This method physically works by vigorously heating the wood.
  • the aim of the treatment is to modify the technical properties of the building material wood and thus to improve its suitability for certain purposes. Differentiation to other methods: In these thermal wood treatments temperatures of degrees 170 0 C to 250 0 C are used.
  • the thermal treatment of woods can be short term or over 24-48 hours, partially in the absence of oxygen or in a steam atmosphere. Thermowood is to be distinguished from a damping or fumigation.
  • Solid wood products are wood products which essentially consist of solid wood or solid wood parts. Solid wood refers to wood-containing starting materials whose cross-sections have been worked out of a tree trunk and possibly further processed by machining, without any changes being made to the structure of the wood.
  • Wood-containing starting materials are Wood-containing starting materials:
  • wood-containing starting materials in the context of the present invention includes all wood-containing substances which can be used as starting material for the production of wood-based materials or solid wood products.
  • Preferred wood-containing starting materials are wood particles or wood parts, as used in the production of chipboard, OSB boards or other wood materials (fiber, carpenter Funierplatten) use and solid wood parts, such as those used in the manufacture of solid wood products including glued wood.
  • Adhesives which can be used according to the invention include all adhesives which are suitable for the production of wood-based materials or solid wood products and their additives, such as those known to the person skilled in the art. Binders, waxes, resins, glues, cementmilk, PF adhesives (phenoplast), MUPF adhesives (melamine-urea-phenol-formaldehyde), UF adhesive (urea-formaldehyde adhesive), MUF adhesives (melamine-containing urea adhesives) Adhesives) and PMDI adhesives (polymeric diphenylmethane diisocyanate).
  • Binder based on renewable resources tannins
  • Tannins are vegetable polyhydroxyphenols (tannins) which are soluble in water, alcohols and acetone. Tannins are mainly extracted by extraction from wood, bark, leaves and fruit. There are numerous studies on the use of extractives from bark of mimosa and bark of various pine species.
  • tannins are divided into hydrolyzable and condensed types.
  • the use of tannins as a binder is carried out either with a formaldehyde component as a crosslinker or in combination with amino or phenolic resins.
  • Preferred glues are selected from:
  • Glutin glue is a natural glue that is made from skin, leather or bone waste.
  • Casein glue This glue consists of milk and lime.
  • Resorcinol-formaldehyde resin glue also called RF glue: Consists of liquid glue and pulverulent hardener.
  • Formaldehyde is needed to harden the glue resins. In most cases, the formaldehyde content is higher than that of the other resin constituents to ensure good cure (stoichiometric excess). However, in the case of this polycondensation glue, the reduction of free formaldehyde is achieved by addition of formaldehyde scavenger or reduction of the formaldehyde content.
  • Formaldehyde-free dispersion glue The known white glue is a formaldehyde-free dispersion glue based on PVAC (polyvinyl acetate) as a binder which is supplied ready for use in water as a dispersion and is available as cold glue, quick binder, veneer glue, hardener glue, lacquer glue and hot glue. It is available in the stress groups D2-D3. For D4 gluing, a D3 glue is required, to which hardener is added before consumption. There are also D2 glues, which reach the D4 quality with the addition of a hardener.
  • PVAC polyvinyl acetate
  • PU glues Today, the most modern glues for the wood industry are the one-component PU glues (polyurethanes). They are waterproof (D4) and not only glue wood, but almost all sticky materials. These are solvent-free reaction adhesives that cure with the help of moisture.
  • Solvent for providing solutions containing tartaric acid and / or tartar tartrate :
  • Suitable solvents are solvents in which the desired antioxidants and / or preservatives and optionally further constituents of the solution, such as adhesives, can be dissolved sufficiently well and which are suitable for use on wood-containing starting materials. These are preferably water, or other organic solvents, such as, for example, alcohols. Suitable solvents include mixtures of water and organic solvents, such as mixtures containing alcohols or mixtures containing various organic solvents. Suitable solvents are known to the person skilled in the art. In particular, the final solution containing tartaric acid or tartaric acid tartrates may be an aqueous solution. wet:
  • the wetting of the wood particles or solid wood parts with a solution containing tartaric acid and / or tartaric acid tartrates can be carried out by any method known to those skilled in the art, which is suitable for contacting the wood particles or solid wood parts with the solution containing tartaric acid and / or tartaric acid tartrate. Suitable methods are e.g. Treating, spraying, coating, dipping or other methods of applying the solution (for example, in the case of MDF production also adding during cooking). The addition of tartaric acid and / or tartaric acid tartrate can also be done together with the glue.
  • tarttaric acid and / or tartaric acid tartrate means a compound consisting of or containing tartaric acid having the empirical formula C 4 H 6 O , also referred to as 2,3-dihydroxysuccinic acid or 2,3-dihydroxybutanedioic acid
  • the salts and esters of tartaric acid also called tartrates of tartaric acid
  • the term “tartaric acid esters” in their alcohol part has a branched or unbranched, saturated or mono- or polyunsaturated alkyl having a carbon chain length of from C1 to C12, particularly preferably from C1 to C8 , most preferably from C1 to C4.
  • Tartaric acid and / or tartaric acid tartrates are preferably used in concentrations of 200 mg / kg to 3 g / kg of wood to be treated or of 10 mg / L to 100 g / L of solution.
  • the solution according to the invention may contain tartaric acid and / or tartaric acid tartrates in a concentration of ⁇ 10 g / l, preferably ⁇ 6 g / l.
  • the solution containing tartaric acid and / or tartaric acid tartrates may contain at least one further antioxidant or another preservative. Suitable further antioxidants and preservatives are given below: According to Appendix 7 of the Addendum Authorization Regulation (ZZuIV):
  • Preservatives Substances that prolong the shelf life of foods by protecting them from the harmful effects of micro-organisms.
  • Antioxidants Substances that prolong the shelf life of foods by protecting them from the harmful effects of oxidation, such as rancidity of fat and color changes.
  • the above groups also include enzyme inhibitors.
  • Preferred preservatives and antioxidants are those in the version of the additive approval (ZZuIV) in the version valid at the filing date, in particular in their Appendices 4 and 5, and in the Cosmetics Ordinance in the version valid at the filing date, in particular in Appendix 6 thereof ,
  • E 170 calcium carbonate, (E 260) acetic acid, (E 261) potassium acetate, (E 262) sodium acetate, sodium acetate, sodium diacetate, (E 263) calcium acetate, (E 270) lactic acid, (E 296) malic acid, (E 300) Ascorbic acid, (E 301) sodium ascorbate, (E 302) calcium ascorbate, (E 304) fatty acid esters of ascorbic acid, ascorbyl palmitate, ascorbyl stearate, (E 306) strong tocopherol-containing extracts, (E 307) alpha-tocopherol, (E 308) gamma-tocopherol, (E 309) delta tocopherol, (E 322) lecithin, (E 325) sodium lactate, (E 326) potassium lactate, (E 327) calcium lactate, (E 330) citric acid, (E 331) sodium citrate, monosodium citrate, disodium citrate, trisodium citrate, (E
  • Diglycerides of fatty acids (E 472c) Citric acid esters of mono- and diglycerides of fatty acids, (E 472d) Tartaric acid esters of mono- and diglycerides of fatty acids, (E 472e) Mono- and diacetyl tartaric acid esters of mono- and diglycerides of fatty acids, (E 472f) Mixed Tartaric and acetic acid esters of mono- and diglycerides of fatty acids, (E 500) Sodium carbonates, Sodium carbonate, Sodium hydrogencarbonate, Sesquicarbonate, (E 501) Potassium carbonate, Potassium carbonate, Potassium bicarbonate, (E 503) Ammonium carbonates, ammonium carbonate, ammonium bicarbonate, (E 504) magnesium carbonate, magnesium carbonate, magnesium hydroxide carbonate, magnesium hydrogencarbonate, (E 507) hydrochloric acid, (E 508) potassium chloride, (E 509) calcium chloride, (E 51 1) magnesium chloride, (E 513)
  • E 200 sorbic acid, (E 202) potassium sorbate, (E 203) calcium sorbate, (E 210) benzoic acid, (E 211) sodium benzoate, (E 212) potassium benzoate, (E 213) calcium benzoate, (E 214) ethyl-p hydroxybenzoate, (E 215) sodium ethyl p-hydroxybenzoate, (E 216) propyl p-hydroxybenzoate, (E 217) sodium propyl p-hydroxybenzoate, (E 218) methyl p-hydroxybenzoate, (E 219) sodium methyl p-hydroxybenzoate, (E 220) sulfur dioxide, (E 221) sodium sulfite, (E 222) sodium hydrosulfite, (E 223) sodium metabisulfite, (E 224) potassium metabisulfite, (E 226) calcium sulfite, (E 227) calcium bisulfite, (E 228) Potassium bisulfite, (E 249) potassium nitrite, (E 22
  • 2,4-hexadienoic acid (sorbic acid) and its salts, 5 formaldehyde and paraformaldehyde, 2-hydroxybiphenyl (o-phenylphenol) and its salts, phenol, 2-zinc bis (2-thiolato-pyridine-1-oxide), (zinc pyrithione ), Inorganic sulfites and bisulfites, unbound SO 2 , sodium iodate, chlorobutanol, 4-hydroxybenzoic acid, its salts and esters, 4-hydroxybenzoic acid benzyl ester, 3-acetyl-6-methyl-2,4 (3H) -pyran-dione (dehydroacetic acid and its salts, formic acid and its sodium salt, 1, 6-bis (4-amidino-2-bromophenoxy) -n-hexane (dibromohexamide) and its salts (including isethionate), ethylmercury (II) thiosalicylic acid,
  • Very particularly preferred further antioxidants and / or preservatives are selected from the group comprising BHA (E320), BHT (E321), citric acid (E330), EDTA (E385), lauryl gallate (Gallate E310 to E312), octyl gallate (E31 1), and their salts and esters.
  • the antioxidants and / or preservatives are preferably used in the concentrations permitted by law in the Food and Cosmetic Additives Ordinance.
  • the antioxidants and / or preservatives are very particularly preferably used in concentrations of 200 mg / kg to 3 g / kg of wood or of 10 mg / L to 100 g / L of solution.
  • the at least one further antioxidant or the at least one further preservative is preferably present in a concentration of ⁇ 10 g / l, preferably ⁇ 6 g / l, very particularly preferably ⁇ 3 g / l.
  • citric acid and / or citric acid tartrates can be used as at least one further antioxidant or at least one further preservative.
  • the ratio of tartaric acid and / or tartaric acid tartrates to a further antioxidant or preservative in a solution according to the invention can be selected from a range from 10: 1 to 1:10, preferably from 5: 1 to 1: 5. The ratio is particularly preferably 1: 1.
  • the solution according to the invention may in particular contain tartaric acid and / or tartaric acid tartrates and citric acid and / or citric acid tartrates in equal concentration proportions, preferably in each case in a concentration of ⁇ 6 g / l, more preferably of ⁇ 3 g / l each.
  • At least one or more different preservatives, antioxidants and combinations thereof can be used in one solution or in different solutions, in a single step or in several, different process steps, at one or more points in the process according to the invention.
  • An embodiment of the process according to the invention for the production of wood-containing intermediates for further processing into wood materials, in particular OSB, and solid wood products comprises the steps: a) use of wood-containing starting materials, b) wetting the wood-containing starting materials with a solution containing tartaric acid and / or tartaric acid tartrates.
  • a preferred embodiment of the process according to the invention for the production of wood-containing intermediates for further processing into wood materials, in particular OSB, and solid wood products comprises the steps: a) use of wood particles or solid wood parts, b) wetting the wood particles or solid wood parts with a further solution containing tartaric acid and or tartaric acid tartrate, wherein the solution may contain other ingredients, such as an adhesive.
  • the wood-containing starting materials preferably wood particles and / or solid wood parts, wetted with a solution comprising tartaric acid and / or tartaric acid tartrate, may optionally be subjected to a drying step before and / or after wetting with the solution according to the invention.
  • a process which is particularly suitable for the production of wood-containing intermediates for further processing into wood materials, in particular OSB, comprises the steps: a) use of wood particles, optionally dried, b) wetting of the wood particles with a solution containing tartaric acid and / or tartaric acid tartrates and at least one adhesive, c) pressing the wetted wood particles.
  • the solution may then optionally contain other ingredients, such as at least one suitable adhesive.
  • the process according to the invention also comprises processes in which, both before drying the wood particles, wetting with a solution containing tartaric acid and / or tartaric acid tartrate takes place, as well as after drying or at another suitable time in the process, e.g.
  • identical or different further preservatives, antioxidants or combinations thereof may be contained in the two solutions, preferably citric acid and / or salts or esters thereof.
  • a preferred process for the preparation of wood-containing intermediates for further processing into wood-based materials comprises the steps of: a) using wood particles, b) wetting the wood particles with a solution containing tartaric acid and / or tartaric acid tartrates, c) drying the product from step b), d) wetting the product from step c) with a solution containing tartaric acid and / or tartaric acid tartrates and / or other preservatives and / or antioxidants and at least one adhesive, e) pressing the product from step d).
  • inventive methods are not limited to wood of a particular type of wood. Also, different woods can be processed together in a process as mixed or separate wood particles or solid wood parts. The process is particularly suitable for the production of wood-containing intermediates containing softwood.
  • the process according to the invention is very particularly suitable for the production of wood-containing intermediates containing pinewood, preferably Pinus sylvestris.
  • the invention further provides wood-containing intermediates for further processing into wood-based materials, in particular OSB, and solid wood products, which are characterized in that the wood-containing starting materials were wetted with a solution containing tartaric acid and / or tartaric acid tartrate.
  • the invention also relates to wood-based materials, preferably OSB boards, and solid wood products, which are characterized in that the wood materials or solid wood products contain wood-containing starting materials which have been wetted with a solution containing tartaric acid and / or Tartarate tartrates or wood-containing intermediates prepared by any of the invention Processes are made.
  • the tartaric acid and / or tartaric acid tartrates can be used to prepare the wood-containing intermediates according to the invention.
  • Tartaric acid and / or tartaric acid tartrates can be used in a process according to the invention for the production of wood-containing intermediates.
  • preservatives and antioxidants are preferably used, either as a single antioxidant or as a single preservative or in combination of several different preservatives and / or antioxidants: BHA (E320), BHT (E321), citric acid (E330) , EDTA (E385), lauryl gallate (Gallate E310 to E312), octyl gallate (E31 1) and / or their salts or esters.
  • BHA BHT
  • citric acid E330
  • EDTA E385
  • lauryl gallate Gallate E310 to E312
  • octyl gallate E31 1
  • a preferred combination of preservatives and antioxidants contains tartaric acid and citric acid.
  • Example 1 Evaluation of the experiments with strands with regard to the effectiveness of added substances in the ⁇ -Chamber
  • Fresh strands were individually dipped in the above solutions of tartaric acid / citric acid (W / C), tartaric acid (W), citric acid (C), sodium citrate (NaC) and a dispersion of octyl gallate (O) at the concentrations shown in Table 1, and then dried in a muffle furnace at 400 0 C.
  • the substances were used individually and / or as a mixture as described in Table 1.
  • untreated (treated with water) strands were dried in a muffle furnace at 400 0 C. After drying, the strands were introduced into the ⁇ -chamber and the VOC emission determined. The results are shown in Table 2.
  • Table 2 Strands treated with water, W / C, W, C, NaC and O.
  • tartaric acid both alone and in admixture with citric acid
  • tartaric acid has an advantage in the range of the octanal compared to sodium citrate and octyl gallate.
  • tartaric acid alone or mixed with citric acid
  • has clear advantages over all aldehydes pentanal, hexanal, heptanal, octanal and nonanal.
  • tartaric acid alone or mixed with citric acid has distinct advantages in the emission of alpha-pinene, beta-pinene and 3-carene, as well as a measurable advantage in the emission of the octanal aldehyde.
  • the superiority of tartaric acid can be further increased by using instead of tartaric acid alone a mixture of tartaric acid and citric acid.
  • the mixture of tartaric acid and citric acid shows in all investigated parameters a measurable advantage over tartaric acid alone.
  • Example 2 Comparison of emission levels of OSB prepared from treated or untreated strands
  • the strands were prepared in the pilot plant in an industrial comparable plant from the pine logs and in the Beleimtrommel which is usually used for gluing, sprayed with the solutions containing a mixture of tartaric and citric acid with the concentration of Table 1.
  • the technological parameters are the same as in the OSB plate production and specified there under the experimental procedure.
  • the beaches were then dried in a drum dryer at 250 ° C. or at 400 ° C. This was followed by examination and analysis in the laboratory. The results are shown in Table 4.
  • Table 4 Industrial strands untreated, treated with water or with W / C, dried at 250 and 400 0 C untreated; Water, W / C, W / C, not dried by dried by drying at 25O 0 C 25O 0 C 400 0 C.
  • Fresh spruce strands were individually dipped in the abovementioned solutions of tartaric acid / citric acid (W / C), tartaric acid (W), citric acid (C) with the concentrations given in Table 1 and then dried in a muffle furnace at 400 ° C. , The substances were used individually and / or as a mixture as described in Table 1. For comparison, only treated with water (untreated) spruce strands were dried in a muffle furnace at 400 ° C. After drying, the spruce strands were introduced into the ⁇ -chamber and the VOC emission determined. The hexanal emission of the spruce strands are summarized in Table 5.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
  • Veneer Processing And Manufacture Of Plywood (AREA)

Abstract

L'invention concerne un procédé de production de produits intermédiaires contenant du bois pour la transformation ultérieure de matériaux en bois, en particulier des panneaux OSB, et des produits en bois massifs, comprenant les étapes suivantes: a) introduction de matières premières contenant du bois; b) mouillage des matières premières contenant du bois à l'aide d'une solution contenant de l'acide tartrique et/ou du tartarate d'acide tartrique.
PCT/EP2009/056097 2008-06-27 2009-05-19 Procédé pour réduire les émissions des matériaux en bois et à base de bois WO2009156231A1 (fr)

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EP09769080A EP2300202A1 (fr) 2008-06-27 2009-05-19 Procédé pour réduire les émissions des matériaux en bois et à base de bois

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DE102008030979.6 2008-06-27
DE102008030979 2008-06-27
DE102009000109A DE102009000109A1 (de) 2008-06-27 2009-01-09 Verfahren zur Emissionsminderung von Holz und Holzwerkstoffen
DE102009000109.3 2009-01-09

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PCT/EP2009/056909 WO2009156258A1 (fr) 2008-06-27 2009-06-05 Procédé pour réduire les émissions (réduction des aldéhydes) du bois et des matériaux en bois par introduction d'un agent de conservation contenant de la colle et/ou des antioxydants

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DE102011104025A1 (de) 2010-06-11 2011-12-15 Technische Universität Dresden Verfahren zur Modifizierung von Holz oder Holzwerkstoffen sowie chemisch und thermisch modifiziertes Holz
DE102013001678A1 (de) 2013-01-31 2014-07-31 INNOLYSIA GbR (vertretungsberechtigte Gesellschafterin: Virginie Soua, 53639 Königswinter) Reduzierung der Schadstoffemission von Holzwerkstoffen
DE102014114921A1 (de) 2013-10-14 2015-04-16 Hochschule für Nachhaltige Entwicklung Eberswalde Verfahren zur Herstellung eines emissionsreduzierten Massivholzproduktes oder eines emissionsreduzierten, holzhaltigen Ausgangsstoffes sowie emissionsreduzierte Massivholzprodukte oder emissionsreduzierte, holzhaltige Ausgangsstoffe

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DE19749849A1 (de) * 1997-11-11 1999-05-20 Kvaerner Panel Sys Gmbh Verfahren und Anlage zur Herstellung von einseitig oberflächenstrukturierten, plattenförmigen Verbundwerkstoffen
DE102004011231A1 (de) * 2004-01-27 2005-08-11 Wtb Biotech Gmbh Mehrkomponenten-Bindemittel und dessen Verwendung
US20080099736A1 (en) * 2004-10-11 2008-05-01 Colin Edward Clarke Fire retardant compositions and methods of use

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DE502005010889D1 (de) * 2004-10-15 2011-03-03 Fraunhofer Ges Forschung Verfahren zur verminderung der abgabe von flüchtigzzerkleinerungsprodukten und aus daraus hergestellten holzwerkstoffen, insbesondere holzspanplatten
BRPI0612549A2 (pt) * 2005-07-06 2010-11-23 Ipposha Oil Ind Co Ltd seqüestrante de aldeìdo, placa de madeira, métodos para produzir os mesmos, e remover aldeìdo, e conjunto

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EP0594038A1 (fr) * 1992-10-20 1994-04-27 BASF Aktiengesellschaft Résines urée-formaldéhyde aqueuses
DE19749849A1 (de) * 1997-11-11 1999-05-20 Kvaerner Panel Sys Gmbh Verfahren und Anlage zur Herstellung von einseitig oberflächenstrukturierten, plattenförmigen Verbundwerkstoffen
DE102004011231A1 (de) * 2004-01-27 2005-08-11 Wtb Biotech Gmbh Mehrkomponenten-Bindemittel und dessen Verwendung
US20080099736A1 (en) * 2004-10-11 2008-05-01 Colin Edward Clarke Fire retardant compositions and methods of use

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WO2009156258A1 (fr) 2009-12-30
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