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EP3072652B1 - Procede de production de matiere premiere comprenant de la cellulose - Google Patents

Procede de production de matiere premiere comprenant de la cellulose Download PDF

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Publication number
EP3072652B1
EP3072652B1 EP16159705.9A EP16159705A EP3072652B1 EP 3072652 B1 EP3072652 B1 EP 3072652B1 EP 16159705 A EP16159705 A EP 16159705A EP 3072652 B1 EP3072652 B1 EP 3072652B1
Authority
EP
European Patent Office
Prior art keywords
acid
hardener
cellulose
wood
synthetic resin
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP16159705.9A
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German (de)
English (en)
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EP3072652A1 (fr
Inventor
Roland Mitter
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.)
Fritz Egger GmbH and Co OG
Original Assignee
Fritz Egger GmbH and Co OG
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Priority to PL16159705T priority Critical patent/PL3072652T3/pl
Publication of EP3072652A1 publication Critical patent/EP3072652A1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/02—Manufacture of substantially flat articles, e.g. boards, from particles or fibres from particles
    • 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
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/002—Manufacture of substantially flat articles, e.g. boards, from particles or fibres characterised by the type of binder
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00—Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/08—Moulding or pressing

Definitions

  • the present invention relates to a process for producing cellulosic materials and to the use of a composition containing a synthetic resin and an acid-forming hardener for producing such cellulose-containing materials.
  • the invention further relates to cellulose-containing materials produced by this process.
  • cellulosic materials There are many subspecies of cellulosic materials. Examples of cellulosic materials are wood-based materials. Cellulosic materials are used for a variety of applications. Main applications for cellulosic materials are the construction and furniture industries, they are mainly used as construction or insulation materials or processed into furniture.
  • Cellulosic materials are usually prepared by pressing different sized cellulose-containing parts such as boards, rods, veneers, veneer strips, chips and / or fibers with synthetic resins. Small cellulose-containing parts such as chips and fibers can also be referred to as cellulose-containing particles. Cellulose-containing parts and particles may for example consist predominantly of wood.
  • these cellulosic parts are homogenized prior to processing into cellulosic materials by crushing so far that strength-reducing defects of the uncrushed parts, such as wood defects, knotholes, cracks or twist, in the finished cellulose-containing materials have essentially no meaning. Therefore, cellulose-containing materials based on small cellulose-containing parts and synthetic resins usually have largely uniform mechanical properties over the size of the cellulose-containing material.
  • a cellulose-containing material contains at least one synthetic resin as binder.
  • a cellulosic material may also contain several, in particular different, synthetic resins. Synthetic resins are normally used in cellulosic materials to permanently bond the cellulosic parts or particles together. For the permanent connection, it is usually required that the resin hardens. In this case, a single synthetic resin or a mixture of synthetic resins can be used.
  • Synthetic resins are known to those skilled in principle. Synthetic resins are for example in Rompps Chemie-Lexikon, 7th edition, Frankh'sche Verlags Stuttgart, 1973, page 1893 described. A group of synthetic resins, which is particularly important for cellulose-containing materials, are condensate resins. These harden by condensation reactions, in which water is often split off.
  • the condensate resins include, for example, phenol-formaldehyde and aminoplast resins.
  • the curing of synthetic resins, in particular condensate can be done for example by addition of acidic catalysts.
  • organic acids such as citric acid and maleic acid
  • inorganic acids such as sulfuric acid and phosphoric acid
  • salts which react acid in water such as aluminum chloride and aluminum nitrate (also referred to as acid salts)
  • salts obtained by reaction with components of the synthetic resin preferably with formaldehyde to generate an acid (also referred to as acid-generating salts) such as ammonium phosphate, ammonium sulfate and ammonium chloride, and mixtures of the aforementioned substances are used.
  • the cellulose-containing particles are usually mixed with a binder, in particular with a synthetic resin, glued.
  • Gluing can be understood in particular as wholly or partially wetting with a binder, in particular with a synthetic resin. Gluing can in particular also mean the uniform distribution of the binder, in particular of the synthetic resin, onto the particles.
  • a composition may also be used which contains one or more synthetic resins and other substances, for example hardeners.
  • the WO 02/068178 A2 describes a method for bonding laminated products with an aminoplast resin using a curing agent containing acid, an acid salt, and / or an acid-generating salt, as well as a polymer dispersion.
  • the WO 2005/030895 A1 describes binder systems which, besides aminoplast resins and N-functionalized copolymers, also contain at least one acid, an acid salt and / or an acid-generating salt.
  • the WO 2007/012615 A1 describes a curing agent composition for aminoplast resins which comprises an acid, an acidic salt and / or an acid-generating salt and an aminoplast resin dispersion having a residual activity of less than or equal to 100 J / g.
  • a disadvantage of the hardener compositions listed in the prior art is that the curing of the resin is difficult to control when using acids as a hardener, since the curing can begin even on addition of the acid.
  • the disadvantage of the acid-generating salts is that these salts usually require free formaldehyde, for example, to form acid with the ammonium salts. In this respect, often more formaldehyde than is needed for the curing of the resin must be added. Normally, however, this formaldehyde is not permanently bound and can be slowly released after completion of the manufacturing process, as well as other free formaldehyde from the condensate.
  • the inventive method allows the production of cellulose-containing materials with a shortened compared to the prior art pressing process.
  • the pressing process can be shortened, in particular, in comparison to cellulosic materials with reduced formaldehyde content and / or reduced formaldehyde emission, which have been prepared according to prior art processes.
  • this surprising effect appears to be explained by the fact that the presence of the hardener according to the invention can reduce the need for free formaldehyde, since the release of acid is presumably not linked to the presence of free formaldehyde , Furthermore, by the use of the hardener according to the invention, the time at which the hardening acid is released, and thus the beginning of the hardening reaction, can be well controlled. Furthermore, it appears that the action of the curing agent reduces the vapor pressure in the pressed cellulose-containing material, which is why the pressing process can be shortened without risking a bursting of the pressed cellulose-containing material.
  • the process according to the invention comprises the gluing of cellulose-containing particles with a composition comprising a synthetic resin and an acid-releasing hardener.
  • the hardener can be added to the synthetic resin before and / or during gluing.
  • a composition containing synthetic resin and Acid-releasing hardener prepared which is then applied to the cellulose-containing particles.
  • the cellulose-containing particles are glued with a composition containing a synthetic resin and an acid-releasing hardener by applying a previously prepared composition containing a synthetic resin and acid-releasing hardener to the cellulose-containing particles.
  • the method according to the invention also encompasses those embodiments in which the hardener and the synthetic resin are added separately during gluing.
  • This can be done in particular by applying the synthetic resin and the acid-releasing hardener separately to the cellulose-containing particles during the gluing of the cellulose-containing particles.
  • the synthetic resin and the acid-releasing hardener mix, so that the result is a composition which "contains" a synthetic resin and an acid-releasing hardener for the purposes of the invention.
  • the synthetic resin and in a second step of the acid-releasing hardener can be applied to the cellulose-containing particles.
  • a further embodiment of the method envisages gluing the cellulosic particles with a composition containing a synthetic resin and an acid-releasing hardener by separately applying the synthetic resin and the acid-releasing hardener to the cellulose-containing particles.
  • the composition containing a synthetic resin and an acid-releasing hardener may contain one or more of these substances.
  • the composition containing a synthetic resin and an acid-releasing hardener may also be referred to as a sizing liquor or synthetic resin liquor.
  • a hardener is used which releases at least one acid during hot pressing by hydrolysis.
  • Hydrolysis in the sense of the invention may in particular mean the cleavage of a (bio) chemical compound by reaction with water.
  • synthetic resins are generally known to the person skilled in the art. Synthetic resins are for example in Rompps Chemie-Lexikon, 7th edition, Frankh'sche Verlags Stuttgart, 1973, page 1893 described. A group of synthetic resins, which is particularly important for cellulose-containing materials, are condensate resins. These harden by condensation reactions, in which water is often split off.
  • the condensate resins include, for example, phenol-formaldehyde and aminoplast resins.
  • Phenol-formaldehyde resins can be obtained by condensation of phenol or a phenol derivative with a carbonyl compound. Common starting materials for phenol-formaldehyde resins are, for example, phenol and formaldehyde (as carbonyl compound). Phenol-formaldehyde resins can be obtained in a two-step process. In this case, a precondensation of the phenol derivative with the carbonyl compound can take place in a first step. In one second step, often referred to as curing, the phenol-formaldehyde resin can then be crosslinked throughout.
  • the condensate resins include aminoplast resins.
  • Aminoplast resins are known to the person skilled in the art and are described, for example, in US Pat. Ullmanns Enzyklopadie der ischen Chemie ", 4th Edition, Volume 7, p. 403ff , described.
  • Aminoplast resins can be obtained by condensing an amino, imino or amide group-containing component with a carbonyl compound. Common starting materials for aminoplast resins are, for example, urea and / or melamine (as the amino-containing component) and formaldehyde (as the carbonyl compound). In the latter case, the amino-containing component is usually precondensed in a first step with the carbonyl compound to a certain degree.
  • melamine resin or a urea resin may in particular form the main constituents of aminoplast resins.
  • the aminoplast resin can then be crosslinked throughout.
  • melamine as the amino and formaldehyde as the carbonyl compound
  • resins, which are formed from urea and formaldehyde one can also speak of urea-formaldehyde resins.
  • aminoplast resins When aminoplast resins are mentioned here or elsewhere, they also mean aminoplast resin compositions. Aminoplast resins and / or aminoplast resin compositions may also contain water.
  • At least partial curing of the synthetic resin takes place during hot pressing.
  • the release of the acid contributes to the curing of the synthetic resin. This may be the case in particular when the resin can be cured by acid catalysis. This helps to shorten the pressing process.
  • the curing agent in the process according to the invention releases at least one acid in the presence of water and / or under the action of heat.
  • the hardener releases an acid in the presence of water and under the action of heat. In this way, it can be specifically controlled under which conditions the hardener releases the at least one acid. This allows a good control of the process.
  • the at least one acid liberated during hot pressing is formed by reaction of the hardener with water vapor. This allows a permanent bond of the resulting water vapor during hot pressing. Thereby, the above-mentioned bursting of the plates can be suppressed particularly effectively. Without wishing to be bound by any particular theory, this could be explained by the fact that the acid-releasing hardener additionally serves as a water scavenger, especially for the water produced during hot pressing.
  • the press factor during hot pressing is from 2 to 12 s / mm, preferably from 3 to 10 s / mm.
  • Press factor can be understood in particular the residence time of the cellulose-containing material in seconds per millimeter thickness or thickness of the finished pressed cellulosic material in the press.
  • the pressing factor usually depends on the desired degree of formaldehyde emission of the cellulose-containing material and / or on the synthetic resin used. A lower formaldehyde content in the resin and / or a lower desired formaldehyde emission normally require higher pressing factors.
  • the pressing factor usually depends on the type of cellulosic material produced. Higher density cellulosic materials normally require higher pressing factors.
  • the pressing factor of 2 to 7 s / mm, in particular from 3 to 6 s / mm.
  • cellulose-containing materials can be produced which have a formaldehyde emission according to emission class E1.
  • the pressing factor is from 4 to 9 s / mm, in particular from 5 to 8 s / mm.
  • cellulose-containing materials can be produced which have a lower formaldehyde emission and / or a higher compression, and / or a synthetic resin having a lower formaldehyde content can be used.
  • the pressing factor is from 6 to 12 s / mm, in particular from 7 to 11 s / mm.
  • the press factors mentioned each represent an optimal compromise between the lowest possible number of burst plates and economical implementation of the method.
  • Suitable temperatures for hot pressing in the process according to the invention are in particular temperatures of 150 ° C to 250 ° C, preferably from 160 ° C to 240 ° C, more preferably from 180 ° C to 230 ° C. At temperatures in these ranges, the process can be carried out particularly economically. At temperatures below 150 ° C, it may happen that the cellulose-containing material is not consolidated over the entire thickness. At temperatures above 250 ° C, it may happen that the surface of the cellulosic material is damaged.
  • a pressing pressure of 1 to 80 bar, preferably from 10 to 70 bar, more preferably from 20 to 60 bar is used.
  • Such pressures ensure a particularly good bonding of the cellulosic particles together.
  • a high strength of cellulose-containing materials can be achieved with such a pressing pressure.
  • the composition containing the synthetic resin and acid-releasing hardener contains from 0.1 to 25% by weight of the acid-releasing hardener, based on the total mass of synthetic resin and hardener.
  • the amount of the acid-releasing curing agent is usually metered as a function of the content of phenol derivative and / or amino- or imino- or amide-containing component. Higher levels of this component or components require a greater amount of acid-releasing hardener.
  • the composition containing the synthetic resin and acid-releasing hardener in the process according to the invention contains from 0.5 to 20% by weight, more preferably from 1 to 18% by weight, even more preferably from 1 to 15% by weight, of the acid-releasing hardener on the total mass of synthetic resin and hardener.
  • the composition containing the synthetic resin and acid-releasing hardener in the process of the invention contains from 1 to 10% by weight of the acid-releasing hardener, based on the total weight of the resin and hardener.
  • the acid released in the process according to the invention has a molecular weight of from 40 g / mol to 500 g / mol, preferably from 40 g / mol to 300 g / mol.
  • An acid in this molecular weight range allows effective curing of the resin.
  • the at least one acid liberated by the hardener is a Bronsted acid having a pKa of less than 8, preferably less than 7, more preferably less than 6.
  • the liberated by the hardener in the process according to the invention at least one acid is a Bronsted acid having a pKa of 3.5 to 5.5.
  • the release of a Brönsted acid can be in the process according to the invention control it very well.
  • a pKa of Bronsted acid of 8 or greater, depending on the resin used curing may not always be as reliable as desired.
  • the binder may be attacked by the acid and at least partially hydrolyzed.
  • the acid liberated in the process according to the invention contains or represents a carboxylic acid.
  • the liberated carboxylic acid has 2 to 20 carbon atoms, more preferably 2 to 12 carbon atoms.
  • the acid released in the process according to the invention contains or consists of a hydroxycarboxylic acid.
  • the hydroxycarboxylic acid released has 2 to 20 carbon atoms, more preferably 2 to 10 carbon atoms.
  • the acid released in the process according to the invention contains or consists of a carboxylic acid and a hydroxycarboxylic acid.
  • the carboxylic acid has 2 to 20 carbon atoms, more preferably 2 to 12 carbon atoms, and the hydroxycarboxylic acid 2 to 20 carbon atoms, more preferably 2 to 10 carbon atoms.
  • the at least one acid liberated by the hardener is preferably more preferably in an amount of from 0.1 to 25% by weight, preferably from 0.5 to 20% by weight, more preferably from 1 to 18% by weight from 1 to 15% by weight, in particular from 1 to 10% by weight, based on the total mass of synthetic resin and hardener. It has been found that the resin can not sufficiently cure at a released acid amount of less than 0.1% by weight. With a released acid amount of more than 25% by weight, the curing process may be worse controlled.
  • a hardener in the process according to the invention in principle a wide variety of substances can be used which release an acid. It is expedient in particular if a hardener is used as acid-releasing hardener is used which contains an ester, preferably a lactone, and / or an acid anhydride. In practical experiments it has been found that the commonly used acids, acidic salts and / or acid-releasing salts can be replaced particularly effectively by hardeners containing acid anhydrides and / or esters, especially lactones. In addition, it has been found in experiments that when using an acid anhydride and / or an ester, in particular a lactone, the swelling values of the resulting cellularlose materials can be improved over cellulosic materials which have been prepared with conventional hardeners.
  • the ester used is preferably a carboxylic acid ester.
  • the carboxylic acid ester has 2 to 30 carbon atoms, preferably 2 to 15 carbon atoms.
  • esters are methyl formate, ethyl acetate, ethyl propanoate, propyl propanoate, propyl benzoate.
  • activated esters such as phenyl esters may also be used.
  • the acid-releasing hardener contains or consists of a lactone.
  • the lactone an intramolecular ester of a hydroxycarboxylic acid is preferably used.
  • the lactone has 3 to 15 carbon atoms, preferably 3 to 8 carbon atoms.
  • the lactone is gamma-butyrolactone and / or epsilon-caprolactone. It has been found that the use of gamma-butyrolactone and / or epsilon-caprolactone makes it particularly possible to effectively suppress the bursting of the pressed cellulosic material with typical pressing processes in the process according to the invention.
  • the acid anhydride an organic acid anhydride is advantageously used.
  • the acid anhydride has 2 to 15 carbon atoms, more preferably 4 to 10 carbon atoms.
  • the acid anhydride which the acid-releasing hardener may contain is selected from the group consisting of acetic anhydride, maleic anhydride, succinic anhydride and dilactide and mixtures thereof.
  • the acid anhydride which may comprise the acid-releasing hardener is selected from the group consisting of acetic anhydride, succinic anhydride and dilactide and mixtures thereof.
  • the synthetic resin used in the process according to the invention may in particular be an aminoplast resin.
  • the acid-releasing curing agents give particularly good results, since the aminoplast resins, in particular melamine-formaldehyde resins, do not require a low pH for curing, whereby the aminoplast resin phase can also be substantially neutral.
  • a substantially neutral aminoplast resin phase may additionally promote a reduction in formaldehyde emission.
  • aminoplast resins have the advantage that they are usually colorless and transparent.
  • Cellulosic particles may in particular be chips, chips, shavings, wafers, flakes, strands and / or fibers containing cellulose.
  • the cellulose-containing particles are wood particles, in particular wood flakes, wood strands, wood wafers, wood chips, wood chips, wood chips and / or wood fibers.
  • the use of such cellulose-containing particles can lead to cellulosic materials with good properties in a particularly economical manner.
  • the wood particles may be, for example, sawdust and / or wood shavings.
  • the wood particles can be made from wood residues, thinnings and / or from used wood.
  • the wood particles can also be made of solid wood.
  • the wood particles can be obtained by grinding in the process of the invention.
  • cutting blades can be used.
  • Shredders or special mills can be used for further comminution.
  • the inventive method is particularly suitable for the production of wood-based materials, preferably of plate-shaped wood materials.
  • the cellulose-containing material is a wood material.
  • wood-based materials are chipboards, flat-pressed sheets, extruded sheets, Oriented Strand Boards and medium-density and high-density fiberboard.
  • the cellulose-containing particles can be dried after comminution.
  • the particles can be dried to a residual moisture content of about 2%.
  • residual moisture the expert understands the water content of the wood after drying. Standard methods for determining the residual moisture are known to the person skilled in the art.
  • the residual moisture can be determined with suitable moisture measuring devices.
  • the residual moisture can also be determined using the Darr method, in which samples of the wood are weighed are then dried in a Darrofen at about 103 ° C to constant weight and then cooled in a desiccator.
  • Drum dryers usually consist of a large cylinder, which is inclined in one direction and slowly rotates about the longitudinal axis. In this case, the cylinder is usually traversed by hot air.
  • the cellulose-containing particles After drying, the cellulose-containing particles can be separated by size. Suitable methods for this are known in the art. For example, classifiers may be used to separate the cellulose-containing particles according to their size.
  • the cellulose-containing particles can be glued.
  • the glued cellulose-containing particles can be provided in the form of a layer. Such a situation can also be referred to as a raw mat.
  • step b provided layer in particular two outer layers and a middle layer.
  • the outer layers may in particular contain finer cellulose-containing particles.
  • the middle layer may in particular contain coarser or larger cellulose-containing particles.
  • Such a construction of the layer can be achieved by applying the layers in succession. Alternatively, for example, it can be ensured by means of a wind-throwing machine that the cover layers contain the finer particles and the middle layer contains the coarser particles.
  • Layer provided also contain foamed plastic particles.
  • step b provided layer in the process according to the invention are first precompressed before hot pressing.
  • the cellulose-containing materials can be sawn to the desired size.
  • the cellulose-containing material can be ground after hot pressing and / or sawing. It is also conceivable that the surface of the cellulose-containing material is finished. This can be done for example by applying decorative papers, melamine films and / or other coatings.
  • the invention further relates to cellulosic materials which have been prepared by the process according to the invention described above.
  • the invention also relates to the use of a composition comprising a synthetic resin and a hardener which forms at least one acid by hydrolysis in a process for producing cellulosic materials.
  • a composition comprising a synthetic resin and a hardener which forms at least one acid by hydrolysis in a process for producing cellulosic materials.
  • the hardener contains an acid anhydride.
  • the hardener contains an ester, in particular a lactone.
  • the hardener contains an acid anhydride and an ester, in particular a lactone.
  • the synthetic resin in the use according to the invention is an aminoplast resin.
  • the cellulose-containing material is a wood material.
  • the process is the above-described inventive process.

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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)
  • Compositions Of Macromolecular Compounds (AREA)
  • Adhesives Or Adhesive Processes (AREA)

Claims (22)

  1. Procédé de fabrication de matériaux contenant de la cellulose, lequel comprend
    a) l'encollage de particules contenant de la cellulose, la composition contenant une résine synthétique et un durcisseur, qui libère un acide,
    b) la mise à disposition d'une couche de particules encollées contenant de la cellulose, et
    c) le pressage à chaud des particules encollées contenant de la cellulose,
    caractérisé en ce que le durcisseur contient un ester d'acide carboxylique et libère au moins un acide par hydrolyse, lors du pressage à chaud.
  2. Procédé selon la revendication 1, caractérisé en ce que, lors du pressage à chaud, un durcissement de la résine synthétique est effectué au moins partiellement.
  3. Procédé selon l'une des revendications précédentes, caractérisé en ce que le dégagement de l'acide contribue au durcissement de la résine synthétique.
  4. Procédé selon l'une des revendications précédentes, caractérisé en ce que le durcisseur libère au moins un acide en présence d'eau et / ou sous l'effet de la chaleur.
  5. Procédé selon l'une des revendications précédentes, caractérisé en ce que l'au moins un acide, dégagé lors du pressage à chaud, est formé par la réaction du durcisseur avec de la vapeur d'eau.
  6. Procédé selon l'une des revendications précédentes, caractérisé en ce que le facteur de pression, lors du pressage à chaud, est de 2 à 12 s/mm, en particulier de 3 à 10 s/mm.
  7. Procédé selon l'une des revendications précédentes, caractérisé en ce que le pressage à chaud est exécuté à une température de 150 °C à 250 °C, en particulier de 160 °C à 230 °C ou de 180°C à 230°C.
  8. Procédé selon l'une des revendications précédentes, caractérisé en ce que le pressage à chaud est exécuté à une pression de 1 à 80 bar, en particulier de 10 à 70 ou de 20 à 60 bar.
  9. Procédé selon l'une des revendications précédentes, caractérisé en ce que la composition contenant de la résine synthétique et du durcisseur, qui libère un acide, contient 0,1 à 25 % en poids de durcisseur, qui libère un acide, par rapport à la masse totale de résine synthétique et durcisseur.
  10. Procédé selon l'une des revendications précédentes, caractérisé en ce que l'acide libéré présente un poids moléculaire de 40 g / mol à 500 g / mol, en particulier de 40 g/mol à 300 g/mol.
  11. Procédé selon l'une des revendications précédentes, caractérisé en ce que l'au moins un acide, libéré par le durcisseur, est un acide de Brönsted ayant un pKa inférieur à 8, en particulier inférieur à 7.
  12. Procédé selon l'une des revendications précédentes, caractérisé en ce que l'au moins un acide, libéré par le durcisseur, est formé en une quantité de 0,1 à 25 % en poids, en particulier de 0,5 à 20 % en poids, respectivement par rapport à la masse totale de résine synthétique et durcisseur.
  13. Procédé selon l'une des revendications précédentes, caractérisé en ce que, comme durcisseur libérant un acide, on utilise un durcisseur qui contient une lactone.
  14. Procédé selon l'une des revendications précédentes, caractérisé en ce que la lactone est une lactone gamma butylique et / ou une caprolactone epsilon.
  15. Procédé selon l'une des revendications précédentes, caractérisé en ce que la résine synthétique est une résine aminoplaste.
  16. Procédé selon l'une des revendications précédentes, caractérisé en ce que les particules contenant de la cellulose sont des particules de bois, en particulier des flocons de bois, des brins de bois, des plaquettes de bois, des esquilles de bois, des copeaux de bois, des fragments de bois et / ou des fibres de bois.
  17. Matériau contenant de la cellulose pouvant être obtenu par un procédé selon l'une des revendications 1 à 16.
  18. Utilisation d'une composition contenant une résine synthétique et un durcisseur, qui forme au moins un acide par hydrolyse, au cours d'un procédé de fabrication de matériaux contenant de la cellulose, caractérisée en ce que le durcisseur contient un ester d'acide carboxylique.
  19. Utilisation selon la revendication 18, caractérisée en ce que le durcisseur contient une lactone.
  20. Utilisation selon l'une des revendications 18 ou 19, caractérisée en ce que la résine synthétique est une résine aminoplaste.
  21. Utilisation selon l'une des revendications 18 à 20, caractérisée en ce que le matériau contenant de la cellulose est un matériau en bois.
  22. Utilisation selon l'une des revendications 18 à 21, caractérisée en ce que le procédé est un procédé selon l'une des revendications 1 à 16.
EP16159705.9A 2015-03-10 2016-03-10 Procede de production de matiere premiere comprenant de la cellulose Active EP3072652B1 (fr)

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PL16159705T PL3072652T3 (pl) 2015-03-10 2016-03-10 Sposób wytwarzania tworzyw zawierających celulozę

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DE102015103513.8A DE102015103513A1 (de) 2015-03-10 2015-03-10 Verfahren zur Herstellung cellulosehaltiger Werkstoffe

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EP3072652B1 true EP3072652B1 (fr) 2018-08-01

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DE (1) DE102015103513A1 (fr)
ES (1) ES2686969T3 (fr)
HU (1) HUE039371T2 (fr)
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2247723C3 (de) * 1972-09-27 1979-11-08 Basf Ag, 6700 Ludwigshafen Verwendung eines aminoplastischen Holzleims als heißhärtender Holzleim
DE2716377B2 (de) * 1977-04-13 1979-03-01 August Moralt Kunststoff Gmbh, 8922 Peiting Verleimte Holzgegenstände
NO324322B1 (no) 2001-02-26 2007-09-24 Dynea Oy Anvendelse av herder samt fremgangsmate ved liming
ATE402234T1 (de) 2003-09-26 2008-08-15 Basf Se Bindemittelsystem enthaltend aminoplastharze, copolymere aus n-funktionalisierten ethylenisch ungesättigten monomeren und gegebenenfalls vinylalkohol und säure
DE102005035693A1 (de) 2005-07-27 2007-02-01 Basf Ag Härtezusammensetzung für Aminoplastharz
DE102005051716A1 (de) * 2005-10-27 2007-05-03 Fritz Egger Gmbh & Co. Bindemittelzusammensetzung für Holzwerkstoffe

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DE102015103513A1 (de) 2016-09-15
LT3072652T (lt) 2018-10-10
PL3072652T3 (pl) 2018-11-30
HUE039371T2 (hu) 2018-12-28
ES2686969T3 (es) 2018-10-23
EP3072652A1 (fr) 2016-09-28

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