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WO2006117159A1 - Compositions aqueuses durcissables pour l'impregnation de materiaux lignocellulosiques - Google Patents

Compositions aqueuses durcissables pour l'impregnation de materiaux lignocellulosiques Download PDF

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Publication number
WO2006117159A1
WO2006117159A1 PCT/EP2006/004015 EP2006004015W WO2006117159A1 WO 2006117159 A1 WO2006117159 A1 WO 2006117159A1 EP 2006004015 W EP2006004015 W EP 2006004015W WO 2006117159 A1 WO2006117159 A1 WO 2006117159A1
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WIPO (PCT)
Prior art keywords
wood
polyalkylene ether
composition
ether polyol
lignocellulosic material
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PCT/EP2006/004015
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German (de)
English (en)
Inventor
Arend Jouke Kingma
Franz Weingart
Holger Militz
Andreas Krause
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BASF SE
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BASF SE
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L71/00—Compositions of polyethers obtained by reactions forming an ether link in the main chain; Compositions of derivatives of such polymers
    • C08L71/02—Polyalkylene oxides
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L97/00—Compositions of lignin-containing materials
    • C08L97/02—Lignocellulosic material, e.g. wood, straw or bagasse
    • 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
    • B27K3/02—Processes; Apparatus
    • B27K3/15—Impregnating involving polymerisation including use of polymer-containing impregnating agents
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/16—Nitrogen-containing compounds
    • C08K5/21—Urea; Derivatives thereof, e.g. biuret

Definitions

  • Aqueous, curable compositions for impregnating lignocellulosic materials are provided.
  • the present invention relates to aqueous, curable compositions for impregnating lignocellulosic materials which comprise at least one low molecular weight compound V which contains at least two N-bonded groups of the formula CH 2 OH and / or a 1,2-bishydroxyethane-1,2-one bridging two nitrogen atoms. having diyl group.
  • the invention also relates to a process for impregnating lignocellulosic materials, in particular wood, using such compositions and the lignocellulosic materials thus obtainable.
  • lignocellulosic materials such as wood and wood-based materials
  • wood and wood-based materials A major problem with lignocellulosic materials such as wood and wood-based materials is their often only moderate to low resistance to exposure to moisture. This results from the property of the lignocellulosic materials, when in contact with water or in a humid atmosphere, to store water. As a result, the materials swell and thus change their shape, tend to crack or lose their mechanical strength in the case of molded articles based on finely divided lignocellulosic materials Microorganisms, which makes it necessary to equip these materials with appropriate fungicides and biocides. This in turn represents a not inconsiderable cost factor and is also environmentally disadvantageous.
  • wood and comparable lignocellulose-based materials are often rendered hydrophobic, e.g. B. by treatment with wax-containing impregnants. This makes penetration of water into the pores of the material more difficult.
  • SE-C 500039 describes a method for hardening wood under compaction, in which untreated wood is impregnated with various aminoplast monomers based on melamine and formaldehyde by means of vacuum pressure impregnation, then dried and cured in a press under compression at elevated temperature.
  • Crosslinkers mentioned include DMDHEU, dimethylolurea, dimethoxymethylurea, dimethylolethyleneurea, dimethylolpropyleneurea and dimethoxydimethylurea. This method has the disadvantage that the natural wood structure is lost through the compaction and the formaldehyde emission of the finished wood body is relatively high depending on the used crosslinker.
  • WO 2004/033171 describes the use of alkanols or polyols modified bis (hydroxymethyl) -4,5-dihydroxyimidazolidinone, 1, 3-bis (hydroxymethyl) - urea, 1, 3-bis (methoxymethyl) urea, 1-hydroxymethyl-3 -methylurea, 1, 3-bis (hydroxymethyl) imidazolidin-2-one, 1, 3-dimethyl-4,5-dihydroxyimidazolidin-2-one or tetra (hydroxymethyl) acetylenediurea as impregnating agent for wood.
  • the impregnating agents lead to the improvement of the durability, dimensional stability and surface hardness of wooden bodies made of solid wood.
  • the invention relates to aqueous, curable compositions
  • aqueous, curable compositions comprising: a) at least one low molecular weight compound V which contains at least two N-bonded groups of the formula CH 2 OH and / or a 1,2-bishydroxyethane-1,2-one bridging two nitrogen atoms Having diyl group, and b) at least one oligo- or polyalkylene ether polyol P having on average at least 2 OH groups, in particular 2 to 6 OH groups, per molecule, the at least one di- or polyhydric aliphatic or cycloaliphatic group having at least 3 C. -Atomen, in particular having 3 to 10 carbon atoms, and / or c) a reaction product of a low molecular weight compound V with the polyalkylene ether polyol.
  • the lignocellulosic materials impregnated using the compositions according to the invention show increased surface hardness and improved shrinkage behavior and thus improved dimensional stability.
  • they are characterized by a higher compared to the prior art elasticity and thus by an improved breaking strength, which comes especially in wood bodies made of solid or glued wood and veneer materials to fruition. Veneers themselves are easier to process due to the improved elasticity.
  • the hydrophilicity of the inventively impregnated lignocellulosic material is reduced compared to the prior art, whereby the absorption of water is reduced and so the durability is improved.
  • compositions of the invention contain as component a) at least one low molecular weight compound V.
  • the compound has by definition at least 2, z. B. 2, 3, 4, 5 or 6 CH 2 -OH groups and especially 2 CH 2 -OH groups which are bonded to a nitrogen atom.
  • the compound V may have, instead or in combination therewith, at least one 1,2-bishydroxyethane-1,2-diyl group.
  • compound V is low molecular weight and has a number average molecular weight below 500 daltons and more preferably below 300 daltons.
  • 1,3-bis (hydroxymethyl) imidazolidin-2-one (dimethylolethyleneurea), 1,3-bis (hydroxymethyl) -1,3-hexahydropyrimidin-2-one (dimethylolpropyleneurea) 1,3-bis (methoxymethyl) -4,5-dihydroxyimidazolidin-2-one (DMeDHEU) 1 tetra (hydroxymethyl) acetylenediurea and low molecular weight melamine-formaldehyde resins, especially at least 2-fold, e.g. B. 2-, 3-, 4-, 5- or 6-fold methylolated melamine and especially Trimethylolme- lamin (2,4,6-tris [bis (hydroxymethyl) amino] triazine).
  • urea compounds which each carry a CH 2 -OH group on both nitrogen atoms of the urea unit.
  • the compound V is 1, 3-bis (hydroxymethyl) -4,5-dihydroxyimidazolidin-2-one.
  • the aqueous composition according to the invention contains at least one oligo- or polyalkylene ether polyol P.
  • This is an aliphatic oligo- or polyether, which in addition to aliphatic ether units at least 2 OH groups in the molecule and also at least one aliphatic or cycloaliphatic structural unit with 3rd or more C atoms, e.g. B. 3 to 10 and in particular 3 to 6 C atoms.
  • These structural units may be repeating units or may result from the initiators used in the preparation of the oligo- or polyethers.
  • the oligo- or polyalkylene ether polyols P present in the compositions according to the invention frequently have a number average molecular weight in the range from 120 to 10,000 daltons, preferably in the range from 180 to 8,000 daltons, in particular in the range from 250 to 6,000 daltons and especially in the range from 300 to 4000 daltons on.
  • oligo- or polyalkylene ether polyols examples are:
  • Alk is C 3 -C 0 -alkylene and in particular C 3 -C 4 -alkylene, for example, 1,2-propanediyl, 1, 3-propanediyl, 1,3- or 1,4-Butand ⁇ yl and q is a number in the range of 2 to 100, in particular 2 to 50 and especially 3 to 30, ß) copolymers and cooligomers of ethylene oxide with C 3 -C 10 -alkylenox ⁇ den, in particular with C 3 -C 4 -alkylenox ⁇ den and especially with Propylene Oxide
  • the structural units derived from ethylene oxide can be arranged randomly or in blocks, the latter being the rule. These include in particular T ⁇ blockcopolymere with a central poly propylene oxide block and terminal polyethylene oxide blocks and T ⁇ blockcopo- polymers with a central polyether oxide Block and terminal polypropylene oxide blocks are preferred,
  • C-atoms in particular 3 to 10 C-atoms are available as starters
  • Typical initiators include aliphatic diols, T ⁇ ole and tetrols having 3 to 10 carbon atoms such as 1, 3-Propand ⁇ ol, 1, 3- and 1, 4-Butand ⁇ ol, 1 , 5-Pentand ⁇ ol, 1, 6-Hexand ⁇ ol, Glycenn, T ⁇ methylolethan, T ⁇ methylolpropan, Erythnt, and pentaerythritol, and Pentite and hexites such as ribitol, arabitol, xylitol, dulcitol, mannitol and sorbitol and inositol, and the like ⁇ ) oligomers and polymers, the by polymerization of C 2 -C 10 -alkylene oxides, in particular of C 2 -C 4 -alkylenoxides and especially of ethylene oxide and / or propylene oxide in the presence of
  • Alkylene oxides in particular of ethylene oxide and / or propylene oxide in the presence of a Oligoetherdiols of the formula
  • the cooligomers and copolymers ⁇ ) are in particular those with an ethylene oxide content of not more than 80% by weight, for. B. 5 to 80 wt .-% and especially 5 to 60 wt .-%, based on the total weight of the cooligomers / copolymers preferred.
  • the oligomers and polymers ⁇ ) and ⁇ ) are in particular those having an ethylene oxide content of not more than 80 wt .-%, z. B. 5 to 80 wt .-% and especially 5 to 60 wt .-%, based on the total weight of the oligomers / polymers, preferably.
  • Oligomers of the groups ⁇ ), ⁇ ), v), ⁇ ), ⁇ ) and ⁇ ) are known in the art, for. From F.E. Bailey et. al. "Polyoxyalkylene” in Ullmann's Encyclopedia of Industrial Chemistry, 5th Ed. on CD-ROM, Wiley-VCH, Weinheim 1997 and literature cited therein, and commercially available, e.g. These include, for example, the trade names Pluriol®, Pluronic®, De- gressal®, polyTHF®, Tetronic®, from BASF, Synperonic® brands from Uniqe- ma and Sepabase® grades from Baker-Petrolite
  • the molar ratio of compound V to the polyalkylene ether polyol P is generally in the range from 1: 0.005 to 1: 2, preferably in the range from 1: 0.01 to 1: 1 and in particular in the range from 1: 0.02 to 1: 0.5.
  • the weight ratio of the compound V to the polyalkylene ether polyol is preferably in the range of 1: 0.05 to 1: 5, more preferably in the range of 1: 0.1 to 1: 1.
  • the total concentration of the compounds V + P in the aqueous composition is usually in the range of 5 to 60% by weight, often in the range of 10 to 60% by weight, and more preferably in the range of 15 to 50% by weight, based on the Total weight of the composition.
  • the aqueous compositions according to the invention may also contain one or more alcohols A, z. B. CVC ⁇ alkanols, C 2 -C 6 polyols, or mixtures of these alcohols.
  • suitable C 1-6 -alkanols are methanol, ethanol, n-propanol, isopropanol, n-butanol and n-pentanol, preference being given to methanol.
  • Suitable polyols are ethylene glycol, diethylene glycol, triethylene glycol, 1, 2 and 1, 3-propylene glycol, 1,2-, 1, 3, and 1,4-butylene glycol, glycerol.
  • the proportion of such alcohols is usually 20 wt .-%, based on the total weight of Do not exceed the composition.
  • the molar ratio of polyols to the polyalkylene ether polyols P will typically be below 1: 1.
  • the composition contains less than 5% by weight of C 2 -C 6 polyols, based on the total weight of C 2 -C 6 polyoxy + polyalkylene ether polyol P.
  • the total amount of compound V, polyether polyol P and alcohol A is usually 10 to 60 wt .-% and in particular 20 to 50 wt .-% of the total weight of the aqueous composition.
  • the aqueous composition according to the invention used for impregnation generally contains at least one catalyst K which brings about the crosslinking of the compound V, of the polyether polyol and of the alcohol A which may be present.
  • catalysts K metal salts from the group of metal halides, metal sulfates, metal nitrates, metal phosphates, Metalltetrafluoroborate; boron trifluoride; Ammonium salts from the group of ammonium halides, ammonium sulfate, ammonium oxalate and diammonium phosphate; and organic carboxylic acids, organic sulfonic acids, boric acid, phosphoric acid, sulfuric acid and hydrochloric acid.
  • metal salts suitable as catalysts K are, in particular, magnesium chloride, magnesium sulfate, zinc chloride, lithium chloride, lithium bromide, aluminum chloride, aluminum sulfate, zinc nitrate and sodium tetrafluoroborate.
  • Suitable as catalysts K ammonium salts are in particular ammonium chloride, ammonium sulfate, ammonium oxalate and diammonium phosphate.
  • catalysts K are water-soluble organic carboxylic acids such as maleic acid, formic acid, citric acid, tartaric acid and oxalic acid, furthermore benzenesulfonic acids such as p-toluenesulfonic acid, but also inorganic acids such as hydrochloric acid, sulfuric acid, boric acid and mixtures thereof.
  • water-soluble organic carboxylic acids such as maleic acid, formic acid, citric acid, tartaric acid and oxalic acid
  • benzenesulfonic acids such as p-toluenesulfonic acid
  • inorganic acids such as hydrochloric acid, sulfuric acid, boric acid and mixtures thereof.
  • the catalyst K is selected from magnesium chloride, zinc chloride, magnesium sulfate, aluminum sulfate and mixtures thereof, with magnesium chloride being particularly preferred.
  • the catalyst K is usually added to the aqueous composition just before impregnation. It is usually used in an amount of 1 to 20 wt .-%, in particular 2 to 10 wt .-%, based on the total weight of the curable components contained in the aqueous composition.
  • the concentration of the catalyst, based on the total weight of the aqueous composition is usually in the range from 0.1 to 10% by weight and in particular in the range from 0.5 to 5% by weight.
  • the aqueous compositions according to the invention can furthermore also effect substances, for. As colorants such as soluble dyes and / or pigments, active against wood-damaging and / or wood-destroying microorganisms, eg.
  • compositions according to the invention can be present in the compositions according to the invention in dissolved or dispersed form. In this way, impregnated materials containing such effect substances are obtained. Due to the hardening of the composition, a fixation of the material also takes place so that a leaching, as observed in conventional impregnation with effect substances, no longer takes place.
  • the compositions of the invention may also contain dispersed waxes as well as the surfactants required to disperse these waxes.
  • compositions according to the invention are suitable for impregnating any desired lignocellulosic materials of any dimensions.
  • they are suitable for impregnating wood, including solid wood, wood-based materials and wood materials for the production of wood-based materials.
  • the compositions of the invention are suitable both for impregnating finely divided materials such as fibers, chips, strands, chips, chips and the like, for impregnating flat thin materials with thicknesses ⁇ 5 mm, in particular ⁇ 1 mm, such as veneers and in particular also for impregnating large-sized parts with minimum dimensions above 1 mm, in particular ⁇ 5 mm, especially ⁇ 10 mm.
  • compositions of the invention are particularly suitable for impregnating wood or wood-based materials or wood materials for the production of wood-based materials, especially for impregnating solid or solid wood.
  • Suitable are in principle all types of wood, in particular those which can absorb at least 30%, in particular at least 50%, of their dry weight of water and particularly preferably those which are assigned to the impregnability classes (or impregnability classes) 1 or 2 according to DIN EN 350-2.
  • impregnability classes or impregnability classes 1 or 2 according to DIN EN 350-2.
  • These include, for example, woods of coniferous trees such as pine, spruce, Douglas fir, larch, pine, fir, coastal fir, cedar, stone pine, as well as woods of deciduous trees, eg.
  • compositions according to the invention are also suitable for impregnating other lignocellulosic materials other than wood, e.g. B. natural fibers such as bamboo, bagasse, cotton stalks, jute, sisal, straw, flax, coconut fibers, banana fibers, reeds, eg. As miscanthus, ramie, hemp, Manila hemp, Esparto (Alfagras), rice husks and cork.
  • natural fibers such as bamboo, bagasse, cotton stalks, jute, sisal, straw, flax, coconut fibers, banana fibers, reeds, eg. As miscanthus, ramie, hemp, Manila hemp, Esparto (Alfagras), rice husks and cork.
  • the present invention relates to the use of the compositions described herein for impregnating lignocellulosic materials, in particular wood, wood-based materials and finely divided materials for the production of wood-based materials.
  • the invention also relates to a method for treating, in particular for impregnating lignocellulosic materials, comprising impregnating the lignocellulosic material with an aqueous composition according to the invention and a crosslinking step at elevated temperature.
  • the lignocellulosic materials obtainable according to the invention are distinguished by better fracture toughness and lower brittleness than the products of the prior art. In addition, a hydrophobic effect is achieved.
  • the impregnation can be done in a conventional manner, for. By immersion, by use of vacuum optionally in combination with pressure or by conventional application methods such as brushing, spraying and the like.
  • the particular impregnation method used naturally depends on the dimensions of the material to be impregnated. Lignocellulosematerialien small dimensions such as shavings or strands and thin veneers, ie materials with a large surface area to volume ratio, can be with little effort, eg. B. impregnate by dipping or spraying, whereas lignocellulosic materials with larger dimensions, in particular materials whose smallest extension is more than 5 mm, z.
  • solid wood molded parts made of solid wood or wood-based materials, under application of pressure or vacuum, in particular by combined application of pressure and vacuum impregnated.
  • the conditions of the impregnation will generally be chosen so that the absorbed amount of curable components of the aqueous composition is at least 1 wt .-%, based on the dry weight of the untreated material.
  • the amount of curable ingredients taken up may be up to 100% by weight, based on the dry weight of the untreated materials, and is often in the range of 1 to 60% by weight, preferably in the range of 5 to 50% by weight, and in particular in the range of 10 to 40 wt .-%, based on the dry weight of the untreated material used, is.
  • the moisture content of the watering used, untreated materials is not critical and may for example be up to 100%.
  • the term "moisture” is synonymous with the term residual moisture content according to DIN 52183.
  • the residual moisture content is below the fiber saturation point of the lignocellulosic material, which is often in the range of 1 to 80% and in particular 5 to 50%.
  • the lignocellulosic material is immersed in a container containing the aqueous composition. Dipping is preferably carried out over a period of a few seconds to 24 hours, in particular 1 minute to 6 hours.
  • the temperatures are usually in the range of 15 ° C to 50 ° C.
  • the lignocellulosic agent absorbs the aqueous composition, and by the concentration of the non-aqueous components (ie curable components) in the aqueous composition, the temperature and the treatment time, the amount of these components taken up by the lignocellulosic material can be controlled
  • the amount of constituents can be determined and controlled by the skilled person in a simple manner by means of the weight increase of the impregnated material and the concentration of the constituents in the aqueous composition.
  • Veneers can be pre-pressed, for example by means of press rolls, so-called calenders, which are in the aqueous impregnating composition
  • calenders which are in the aqueous impregnating composition
  • the vacuum occurring in the lignocellulosic material then leads to an accelerated absorption of aqueous impregnating composition
  • the impregnation is advantageously carried out by combined application of reduced and elevated pressure.
  • the lignocellulosic material which generally has a humidity in the range of 1% to 100%, first under reduced pressure, which is often in the range of 10 to 500 mbar and in particular in the range of 40 to 100 mbar, with the aqueous composition
  • the period of time is usually in the range of 1 minute to 1 hour.
  • a period at elevated pressure eg. B. in the range of 2 to 20 bar, in particular in 4 to 15 bar and especially 5 to 12 bar, to.
  • the duration of this phase is usually in the range of 1 min to 12 h.
  • the temperatures are usually in the range of 15 to 50 0 C.
  • the aqueous composition where by the concen- ration to the non-aqueous components (d. H curable ingredients) in the composition wass ⁇ - gene, by the Pressure, by the temperature and the treatment time, the amount of these components taken up by the lignocellulosic material can be controlled.
  • the actual amount absorbed can also be calculated here by the weight gain of the lignocellulosic material.
  • the impregnation can be carried out by conventional methods for applying liquids to surfaces, for. B. by spraying or rolling or brushing.
  • the application is usually carried out at temperatures in the range of 15 to 50 0 C.
  • the spraying can be carried out in a conventional manner in all suitable for spraying of flat or finely divided bodies devices, for. B. by Düsena ⁇ ord ⁇ ungen and the like.
  • brushing or rolling the desired amount of aqueous composition is applied to the flat material with rollers or brushes.
  • the curing of the crosslinkable constituents of the aqueous composition takes place.
  • the curing can be carried out in analogy to the methods described in the prior art, for. B. according to the methods described in WO 2004/033170 and WO 2004/033171.
  • the curing is typically carried out by treating the impregnated material at temperatures above 80 0 C, in particular above 90 0 C, z.
  • the derliche require for the curing time typically ranges from 10 minutes to 72 hours. Veneers and finely divided lignocellulosic materials tend to use higher temperatures and shorter times.
  • During curing not only are the pores in the lignocellulosic material filled with the hardened impregnating agent, but crosslinking between the impregnating agent and the lignocellulosic material itself is produced.
  • a drying step in the following also a predrying step, can be carried out before curing.
  • the volatile constituents of the aqueous composition in particular the water and excess organic solvents which do not react in the curing / crosslinking, are partially or completely removed.
  • Predrying means that the lignocellulosic material is dried below the fiber saturation point, which is about 30% by weight, depending on the nature of the material. This predrying counteracts the risk of cracking, especially in large-scale wood bodies.
  • the predrying can be dispensed with.
  • the predrying is beneficial. If a separate predrying is carried out, this is advantageously carried out at temperatures in the range of 20 to 80 ° C. Depending on the chosen drying temperature, partial or complete curing / crosslinking of the curable constituents contained in the composition can take place.
  • the combined predrying / curing of the impregnated materials is usually carried out by Creating a temperature profile that can range from 50 0 C to 220 0 C, in particular from 80 to 200 0 C.
  • the curing / drying can be done in a conventional fresh air exhaust system, eg. B. a drum dryer can be performed.
  • Pre-drying preferably takes place in such a way that the moisture content of the finely divided lignocellulosic materials after predrying is not more than 30%, in particular not more than 20%, based on the dry mass. It may be advantageous to carry out the drying / curing up to a moisture content ⁇ 10% and in particular ⁇ 5%, based on the dry mass.
  • the moisture content can be easily controlled by the temperature, the duration and the pressure selected during pre-drying.
  • one will remove by mechanical means adhering liquid before drying / curing.
  • the wood materials impregnated according to the invention can be further processed in a manner known per se, in the case of finely divided materials, for example.
  • molded articles such as OSB (oriented structural board) plates, chipboard, wafer boards, OSL plates and OSL (Oriented Strand Lumber), PSL plates and PSL (Parallel Strand Lumber) moldings.
  • MDF medium-density
  • HDF high-density
  • WPC wood-plastic composites
  • the further processing can take place immediately after the impregnation, during or after the hardening of the constituents Ie V, P and optionally A taken up by the lignocellulosic material. In the case of impregnated veneers, it will be advantageous to carry out the further processing before the hardening step or together with the hardening step. For molded articles of finely divided materials, the molding step and curing step are preferably carried out simultaneously.
  • the impregnated lignocellulosic material is solid wood or a ready-made wood-based material, it can be processed in the usual way. the, z.
  • the impregnated lignocellulosic material is solid wood or a ready-made wood-based material, it can be processed in the usual way. the, z.
  • sawing, planing, grinding, etc. impregnated according to the invention and hardened solid wood is particularly suitable for the production of objects that are exposed to moisture and especially weathering, z.
  • compositions (impregnating agents) of Examples 1 to 4 according to the invention were prepared by mixing the constituents.
  • DMDHEU was used as an aqueous formulation.
  • the percentages are to be understood as weight percent of the respective component, based on the total weight of the composition:
  • Example 1 The additive used was a polyethylene oxide-polypropylene oxide triblock copolymer with a central polypropylene oxide block.
  • the central polypropylene block had a number average molecular weight of about 850 daltons.
  • the ethylene oxide content was 10% by weight, based on the polymer.
  • Example 2 The additive used was a polyethylene oxide-polypropylene oxide triblock copolymer with a central polypropylene oxide block.
  • the central polypropylene block had a number average molecular weight of about 1100 daltons.
  • the ethylene oxide content was 30% by weight, based on the polymer.
  • Example 3 The additive used was a polyethylene oxide-polypropylene oxide triblock copolymer with a central polypropylene oxide block.
  • the central polypropylene block had a number average molecular weight of about 1750 daltons.
  • the ethylene oxide content was 10% by weight, based on the polymer.
  • Example 4 The additive used was a polyethylene oxide-polypropylene oxide triblock copolymer with a central polyethylene oxide block.
  • the block copolymer had a number average molecular weight of about 2150 daltons.
  • the ethylene oxide content was 20% by weight, based on the polymer.
  • the wood samples were placed in an impregnation plant.
  • the impregnation system was exposed for 30 minutes to a vacuum of absolutely 40 mbar. Subsequently, the
  • Impregnation plant with the impregnating agent while maintaining a vacuum of 50 mbar absolutely flooded. Subsequently, a pressure of 12 bar was applied for 2 hours. The printing phase was stopped and the residual liquid was removed.
  • the wood samples were then stored in a temperature and humidity controllable drying chamber and fixed so that discarding was impossible.
  • the chamber was brought to 120 ° C while maintaining a relative humidity of 95%. These conditions were maintained for a period of at least 120 ° C. for 48 hours in the interior of the wood samples.

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Abstract

La présente invention concerne des compositions aqueuses durcissables pour l'imprégnation de matériaux lignocellulosiques, lesquelles compositions contiennent : a) au moins un composé V de faible poids moléculaire, présentant au moins deux groupes liés à N de formule CH<SUB>2</SUB>OH et/ou un groupe 1,2-bishydroxyéthan-1,2-diyle faisant la liaison entre deux atomes d'azote, et b) au moins un polyol d'éther d'oligo- ou de polyalkylène P présentant en moyenne au moins 2 groupes OH, en particulier 2 à 6 groupes OH, par molécule, qui comprend au moins un groupe aliphatique ou cycloaliphatique bivalent ou plurivalent présentant au moins 3 atomes de carbone, en particulier 3 à 10 atomes de carbone, et/ou c) un produit de la réaction d'un composé V de faible poids moléculaire avec le polyol d'éther de polyalkylène. Cette invention concerne également un procédé d'imprégnation de matériaux lignocellulosiques, en particulier du bois, au moyen de compositions de ce type et les matériaux lignocellulosiques ainsi obtenus.
PCT/EP2006/004015 2005-05-02 2006-04-28 Compositions aqueuses durcissables pour l'impregnation de materiaux lignocellulosiques Ceased WO2006117159A1 (fr)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008069684A3 (fr) * 2006-12-04 2008-07-31 George William Mason John Brod Modification du bois par des prépolymères hydrophiles
DE102007005527A1 (de) 2007-02-03 2008-08-07 Alzchem Trostberg Gmbh Verfahren zur Behandlung von Holzteilen
WO2010046696A1 (fr) * 2008-10-23 2010-04-29 Kurawood Plc Matériau lignocellulosique et modification du matériau lignocellulosique
US7939177B2 (en) 2005-10-04 2011-05-10 Basf Aktiengesellschaft Lignocelluosic material which is low in formaldehyde and method for the production thereof

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US5627232A (en) * 1995-06-07 1997-05-06 United Catalysts, Inc. Water-based composition containing an aminoplast-ether copolymer
WO2004033170A1 (fr) * 2002-10-04 2004-04-22 Basf Aktiengesellschaft Procede pour ameliorer la durabilite, la stabilite dimensionnelle et la durete superficielle d'un corps en bois
US20040147649A1 (en) * 2002-08-20 2004-07-29 Kovacs Stephen G. Non-toxic hydrophobic elastomeric polymer chemistry system for wood preservation

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5627232A (en) * 1995-06-07 1997-05-06 United Catalysts, Inc. Water-based composition containing an aminoplast-ether copolymer
US20040147649A1 (en) * 2002-08-20 2004-07-29 Kovacs Stephen G. Non-toxic hydrophobic elastomeric polymer chemistry system for wood preservation
WO2004033170A1 (fr) * 2002-10-04 2004-04-22 Basf Aktiengesellschaft Procede pour ameliorer la durabilite, la stabilite dimensionnelle et la durete superficielle d'un corps en bois

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7939177B2 (en) 2005-10-04 2011-05-10 Basf Aktiengesellschaft Lignocelluosic material which is low in formaldehyde and method for the production thereof
WO2008069684A3 (fr) * 2006-12-04 2008-07-31 George William Mason John Brod Modification du bois par des prépolymères hydrophiles
US20100068543A1 (en) * 2006-12-04 2010-03-18 Zelam Limited Modification of wood with hydrophilic prepolymers
AU2007328546B2 (en) * 2006-12-04 2011-04-21 Zelam Limited Modification of wood with hydrophilic prepolymers
US8252426B2 (en) 2006-12-04 2012-08-28 Zelam Limited Modification of wood with hydrophilic prepolymers
DE102007005527A1 (de) 2007-02-03 2008-08-07 Alzchem Trostberg Gmbh Verfahren zur Behandlung von Holzteilen
WO2010046696A1 (fr) * 2008-10-23 2010-04-29 Kurawood Plc Matériau lignocellulosique et modification du matériau lignocellulosique

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