EP2464692A1 - Matériaux lignocellulosiques légers possédant de bonnes propriétés mécaniques - Google Patents

Matériaux lignocellulosiques légers possédant de bonnes propriétés mécaniques

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Publication number
EP2464692A1
EP2464692A1 EP10742800A EP10742800A EP2464692A1 EP 2464692 A1 EP2464692 A1 EP 2464692A1 EP 10742800 A EP10742800 A EP 10742800A EP 10742800 A EP10742800 A EP 10742800A EP 2464692 A1 EP2464692 A1 EP 2464692A1
Authority
EP
European Patent Office
Prior art keywords
plastic particles
particles
light
expanded
wood
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP10742800A
Other languages
German (de)
English (en)
Inventor
Maxim Peretolchin
Stephan WEINKÖTZ
Günter Scherr
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.)
BASF SE
Original Assignee
BASF SE
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BASF SE filed Critical BASF SE
Priority to EP10742800A priority Critical patent/EP2464692A1/fr
Publication of EP2464692A1 publication Critical patent/EP2464692A1/fr
Withdrawn legal-status Critical Current

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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
    • B27N3/005—Manufacture of substantially flat articles, e.g. boards, from particles or fibres and foam
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L25/00—Compositions of, homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Compositions of derivatives of such polymers
    • C08L25/02—Homopolymers or copolymers of hydrocarbons
    • C08L25/04—Homopolymers or copolymers of styrene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L61/00—Compositions of condensation polymers of aldehydes or ketones; Compositions of derivatives of such polymers
    • C08L61/20—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L75/00—Compositions of polyureas or polyurethanes; Compositions of derivatives of such polymers
    • C08L75/04—Polyurethanes

Definitions

  • the present invention relates to a process for producing a light lignocellulose-containing substance having an average density in the range from 200 to 600 kg / m 3 , in which, in each case based on the lignocellulose-containing substance:
  • a binder selected from the group consisting of aminoplast resin, phenol-formaldehyde resin, and organic isocyanate having at least two isocyanate groups and optionally
  • the present invention relates to a process for producing a multilayered lignocellulosic material as defined in the claims.
  • Lignocellulosic materials for example wood-based materials, in particular multilayer wood-based materials, are a cost-effective and resource-saving alternative to solid wood and have great significance, in particular in furniture construction
  • Laminate flooring and obtained as building materials. serve as starting materials
  • Wood particles of different thickness z. B. wood chips or wood fibers
  • wood particles are usually pressed with natural and / or synthetic binders and optionally with the addition of further additives to plate or strand-shaped wood materials.
  • lightweight wood-based materials are of great importance for the following reasons: Lightweight wood-based materials make the end-user easier to handle the products, for example when packing, transporting, unpacking or constructing the furniture.
  • Light wood-based materials lead to lower transport and packaging costs, and material costs can be saved in the production of lightweight wood-based materials.
  • Light wood-based panels can, for example, when used in means of transport lead to lower energy consumption of these means of transport. Furthermore, using light wood materials, for example, material-consuming
  • Decorative parts such as currently come in vogue thicker worktops and cheeks in kitchens, are offered at a lower cost.
  • tube chipboard and honeycomb panels are mentioned. Due to their special properties, tube chipboards are mainly used in the
  • honeycomb panel for example, the too low screw extraction resistance, the difficulty attaching fittings and the difficulties in edging.
  • WO 02/38676 describes a process for the preparation of light products in which 5 to 40 wt .-% of foamable or already foamed polystyrene with a
  • the propellant content of the filler polymer WO 02/38676 does not express.
  • WO 2008/046892 A (BASF SE) describes, among other things, light wood-containing substances which contain, for example, wood chips or fibers, a binder and a porous plastic serving as filler.
  • wood-containing substances are, for example, the wood chips or fibers with binder and
  • WO 2008/046890 A, WO 2008/046891 A and WO 2008/046892 A are silent on the blowing agent content of the filler polymers or their precursors.
  • Plastic particles used precursor polymers (synonymous with expandable plastic particles) relatively large amounts (usually more than 5 wt .-% based on the expandable plastic particles) of propellant, for example
  • Pentane (mixtures), included. Most propellants, such as pentane, are highly flammable.
  • Lignocellulose materials preferably multilayer wood materials to prevent.
  • the expanded plastic particles for example polystyrene, with pentane (mixtures) as blowing agent, stored for several days in special silos with ventilation, so that the propellant, for example, pentane (mixture), can escape.
  • pentane mixture
  • This relatively long storage prevents continuous production of the light lignocellulosic, for example woody, substances or corresponding, usually multilayer, lignocellulosic materials, for example wood-based materials, and can lead to a reduction of the production capacity for the light ones
  • lignocellulose-containing substances for example wood-containing substances or equivalent, usually multi-layered, lignocellulosic materials, such as wood materials lead.
  • the object of the present invention was to show plastic particles for light lignocellulosic materials and light lignocellulosic materials, which can be prepared and handled without risk of fire and which controlled with relatively simple process expand and quickly reuse but they lignocellulosic, preferably wood-containing, substances and Lignocellulosic materials, preferably wood materials, lower density lead, with at least equally good mechanical strength and good processing properties, such as Bekant zucchini, such as those of the prior art.
  • the mechanical strength can be determined, for example, by measuring the
  • Transverse tensile strength according to EN 319 can be determined.
  • Table 10 can be used to assess the edgebandability or sticking of edges on chipboard. Furthermore, the swelling value of the light lignocellulosic materials, preferably wood-based materials, should not be adversely affected by the reduced density.
  • the object was achieved by a process for producing a light lignocellulose-containing substance having an average density in the range from 200 to 600 kg / m 3 , in which, in each case based on the lignocellulosic substance:
  • a binder selected from the group consisting of aminoplast resin, phenol-formaldehyde resin and organic isocyanate having at least two isocyanate groups and optionally
  • lignocellulose, lignocellulose particles or lignocellulose-containing substance are known in the art.
  • Lignocellulosic material, lignocellulosic particles or lignocellulosic particles are, for example, straw or wood parts, such as wood plies, wood strips, wood chips, wood fibers or wood dust, wood chips, wood fibers and wood dust being preferred.
  • the lignocellulose-containing particles or lignocellulose particles may also be derived from wood fiber-containing plants, such as flax, hemp.
  • Thinning woods Industrial woods and used woods as well as wood fiber plants.
  • Preferred lignocellulose-containing particles are wood particles, particularly preferably wood fibers, such as those used for the production of MDF and HDF boards.
  • Highly suitable lignocellulose-containing particles are also flax or hemp particles, particularly preferably flax or hemp fibers, as can be used for the production of MDF and HDF boards.
  • the lignocellulosic, preferably wood-containing substance may contain the usual small amounts of water (in a usual small fluctuation range); This water is not included in the weight of the present application.
  • the weight specification of the lignocellulose particles preferably wood particles, relates to dried in a conventional manner known to those skilled in the art
  • Lignocellulose particles preferably wood particles.
  • the weight of the binder refers to the
  • Aminoplastkomponente in the binder on the solids content of the corresponding component (determined by evaporation of water at 120 0 C, within 2 h after, for example, Günter Zeppenfeld, Dirk Grunwald, adhesives in the wood and furniture industry, 2nd edition, DRW-Verlag , Page 268) and with regard to the isocyanate, in particular the PMDI, to the isocyanate component per se, that is, for example, without a solvent or emulsifier.
  • the light lignocellulose-containing, preferably wood-containing substances according to the invention have an average density of 200 to 600 kg / m 3 , preferably 200 to 575 kg / m 3 , particularly preferably 250 to 550 kg / m 3 , in particular 300 to 500 kg / m 3 .
  • the transverse tensile strength of the light lignocellulose-containing, preferably wood-containing materials according to the invention or preferably of the multilayer lignocellulose materials according to the invention, particularly preferably multilayer wood-based materials, is generally in the range from 0.1 N / mm 2 to 1.0 N / mm 2 , preferably 0.3 to 0 , 8 N / mm 2 , more preferably 0.4 to 0.6 N / mm 2 .
  • the determination of the transverse tensile strength is in accordance with EN 319.
  • Suitable multilayered lignocellulosic materials are all materials which are made of wood veneers, preferably with an average density of the wood veneers of 0.4 to 0.85 g / cm 3 , for example veneer boards or plywood boards or laminated veneer lumber (LVL ).
  • multilayered lignocellulosic materials preferably multilayered
  • Wood-based materials are particularly preferably all materials which are made of lignocellulosic chips, preferably wood chips, preferably with an average density of the wood chips of 0.4 to 0.85 g / cm 3 , for example chipboard or OSB boards, and wood fiber materials such as LDF , MDF and HDF boards.
  • Particleboard and fiberboard, in particular chipboard, are preferred.
  • the average density of the lignocellulose particles is generally 0.4 to 0.85 g / cm 3 , preferably 0.4 to 0.75 g / cm 3 , in particular 0.4 to 0.6 g / cm 3 .
  • any wood species comes into question; For example, spruce, beech, pine, larch, linden, poplar, ash, chestnut or fir wood are very suitable; spruce and / or beech wood, in particular spruce wood, are preferred.
  • the dimensions of the lignocellulose particles are not critical and, as usual, depend on the lignocellulose material to be produced, preferably wood-based material, for example the abovementioned wood-based materials, such as chipboard or OSB.
  • Komponete B) are expanded plastic particles, preferably expanded thermoplastic particles.
  • Such expanded plastic particles are usually obtained as follows: Compact plastic particles containing an expansible medium (also called “propellant”) are expanded by the action of heat energy or pressure change (often referred to as “foamed”). This stretches The propellant, the particles increase in size and cell structures arise.
  • expansible medium also called “propellant”
  • prefoamers This expansion is generally carried out in conventional frothing devices, often referred to as "prefoamers.” Such prefouchers may be stationary or mobile.
  • the expansion can be carried out in one or more stages. As a rule, in the single-stage process, the expandable plastic particles are readily expanded to the desired final size.
  • the expandable plastic particles are first expanded to an intermediate size and then expanded in one or more further stages over a corresponding number of intermediate sizes to the desired final size.
  • Plastic particles usually no cell structures.
  • Typical measures for propellant reduction of expanded plastic particles are, for example, prolonged storage, generally 12 hours to several days, of the expanded plastic particles in open vessels or in vessels with, for the propellant, permeable walls. This storage generally takes place at ambient temperature, for example 20 to 30 ° C.
  • Propellant reduction herein is the demonstrable reduction of propellant by conventional analytical methods (for example gas chromatography). Concentration in the collective of freshly expanded plastic particles with
  • propellant reduction is intended to include here also the other changes of the expanded plastic particles occurring during prolonged storage of the expanded plastic particles, for example shrinkage or aging.
  • the expanded plastic particles become continuous to produce the light lignocellulosic material
  • Plastic particles to expanded plastic particles and their further use preferably conveyed into the plant for the production of the light lignocellulosic material, proceed in a temporally practically uninterrupted process chain.
  • the conveying path for the expanded plastic particles may have one or more buffer containers in the main or shunt.
  • the plant for the production of the light lignocellulose-containing substance usually also comprises a mixing device in which the component B) is mixed with the other components.
  • the above-described expanding ("foaming") of the expandable plastic particles at the site of production of the light lignocellulosic, preferably light wood-containing material is carried out and the resulting expanded plastic particles, for example without further
  • Measures for propellant reduction directly reused, for example, directly into the apparatus for producing the light lignocellulosic material, preferably light wood-containing substance, fed.
  • “Locally” means nearby, for example, within a radius of about 200
  • Expanding of the expandable plastic particles carried out at the site of production of the light lignocellulosic, preferably light wood-containing material in a mobile AufMumvoutter and the thus obtained expanded plastic particles, for example, without further measures to
  • Propellant reduction directly reused, for example, directly into the apparatus for producing the light lignocellulosic material, preferably light wood-containing material, fed.
  • Light wood-containing material herein means nearby, for example, within about 200 meters, or adjacent to the device in which the light wood-containing material is produced and optionally further processed.
  • Mobile frothing device herein means that the frothing device can be easily assembled and disassembled, or, preferably, is mobile, for example, mounted on a wheeled vehicle (eg truck) or rail vehicle Mobile frothing devices as a truck body are used, for example, by HIRSCH Servo AG, Glanegg 58, A-9555 Glanegg Suitable polymers which are based on the expandable or expanded plastic particles are all polymers, preferably thermoplastic polymers, which can be foamed, which are known to the person skilled in the art.
  • polymers for example, polyketones, polysulfones, polyoxymethylene, PVC (hard and soft), polycarbonates, polyisocyanurates,
  • Polycarbodiimides polyacrylimides and polymethacrylimides, polyamides, polyurethanes, aminoplast resins and phenolic resins, styrene homopolymers (hereinafter also referred to as "polystyrene” or “styrene polymer”), styrene copolymers, C 2 -C 10 -olefin homopolymers, C 2 -C 10 -olefin copolymers and polyesters.
  • 1-alkenes for example, ethylene, propylene, 1-butene, 1-hexene, 1-octene.
  • the expanded plastic particles of component B) have a bulk density of from 10 to 100 kg / m 3 , preferably from 15 to 90 kg / m 3 , particularly preferably from 20 to 80 kg / m 3 , in particular from 40 to 80 kg / m 3 .
  • the bulk density is usually determined by weighing a volume filled with the bulk material.
  • Expanded plastic particles B) are generally used in the form of spheres or beads having an average diameter of advantageously 0.25 to 10 mm, preferably 0.4 to 8.5 mm, in particular 0.4 to 7 mm.
  • Expanded plastic particle beads or beads B) advantageously have a small surface area per volume, for example in the form of a spherical or elliptical particle.
  • the expanded plastic particle balls B) are advantageously closed-cell.
  • the open cell density according to DIN-ISO 4590 is usually less than 30%.
  • component B) consists of different types of polymers, ie polymer types which are based on different monomers (for example polystyrene and polyethylene or polystyrene and homopolypropylene or polyethylene and homopolypropylene), these may be present in different weight ratios, which, however, according to the current state of the art Knowledge, not critical.
  • the polymers may contain additives, for example UV stabilizers, antioxidants, coating agents, water repellents, nucleating agents, plasticizers, flameproofing agents, soluble and insoluble inorganic and / or organic compounds Dyes, pigments, and athermane particles, such as carbon black, graphite or aluminum powder, together or spatially separated as
  • blowing agents for expanding the expandable plastic particles it is possible to use all blowing agents known to the person skilled in the art, for example aliphatic C 3 - to C 10 -hydrocarbons, such as propane, n-butane, isobutane, n-pentane, isopentane, neopentane-cyclo-pentane and / or hexane and its isomers, Alcohols, ketones, esters, ethers or halogenated hydrocarbons.
  • blowing agents for example aliphatic C 3 - to C 10 -hydrocarbons, such as propane, n-butane, isobutane, n-pentane, isopentane, neopentane-cyclo-pentane and / or hexane and its isomers, Alcohols, ketones, esters, ethers or halogenated hydrocarbons.
  • the content of blowing agent in the expandable plastic particles is in the range of 0.01 to 7 wt .-%, preferably 0.01 to 4 wt .-%, particularly preferably 0.1 to 4 wt .-%, most preferably 0, 5 to 3.5 wt .-%, each based on the propellant-containing expandable plastic particles.
  • styrene homopolymer also referred to simply as "polystyrene” herein
  • styrene copolymer is used as the sole plastic component in component B.
  • Such polystyrene and / or styrene copolymer can be prepared by any polymerization method known to those skilled in the art, see, for example, Ullmann's Encyclopedia, Sixth Edition, 2000 Electronic Release or Plastics Handbook 1996, Volume 4 "Polystyrene", pages 567 to 598.
  • the production of the expandable polystyrene and / or styrene copolymer is generally carried out in a conventional manner by suspension or by extrusion.
  • Suspension stabilizer polymerized by means of radical-forming catalysts The propellant and optionally other additives can thereby in the Be submitted to polymerization or be added to the approach in the course of polymerization or after completion of the polymerization.
  • the resulting peribular, impregnated with blowing agent, expandable styrene polymers are separated after the polymerization from the aqueous phase, washed, dried and sieved.
  • the blowing agent is mixed for example via an extruder in the polymer, conveyed through a nozzle plate and granulated under pressure to particles or strands.
  • Styrene copolymer can be used all blowing agents known to those skilled in the art and already mentioned above, for example aliphatic C3 to C10 hydrocarbons, such as propane, n-butane, isobutane, n-pentane, isopentane, neopentane cyclo-pentane and / or hexane and its isomers, Alcohols, ketones, esters, ethers or halogenated hydrocarbons.
  • aliphatic C3 to C10 hydrocarbons such as propane, n-butane, isobutane, n-pentane, isopentane, neopentane cyclo-pentane and / or hexane and its isomers, Alcohols, ketones, esters, ethers or halogenated hydrocarbons.
  • the propellant is preferably selected from the group consisting of n-pentane, isopentane, neopentane and cyclopentane. It is particularly preferred to use a commercial pentane isomer mixture of n-pentane and isopentane.
  • the content of blowing agent in the expandable polystyrene or styrene copolymer is in the range of 0.01 to 7 wt .-%, preferably 0.01 to 4 wt .-%, particularly preferably 0.1 to 4 wt .-%, most preferably 0 , 5 to 3.5 wt .-%, each based on the propellant-containing expandable polystyrene or styrene copolymer.
  • the content of C3 to Cio hydrocarbons as blowing agent in the expandable polystyrene or styrene copolymer is in the range of 0.01 to 7 wt .-%, preferably 0.01 to 4 wt .-%, particularly preferably 0.1 to 4 wt. -%, most preferably 0.5 to 3.5 wt .-%, each based on the propellant-containing expandable polystyrene or styrene copolymer.
  • blowing agent selected from the group consisting of n-pentane, isopentane, neopentane and cyclopentane, in expandable polystyrene or
  • Styrene copolymer is in the range of 0.01 to 7 wt .-%, preferably 0.01 to 4 wt .-%, particularly preferably 0.1 to 4 wt .-%, most preferably 0.5 to 3.5 wt. -%, respectively, based on the propellant-containing expandable polystyrene or styrene copolymer.
  • the content of propellant selected from the group consisting of n-pentane,
  • Isopentane, neopentane and cyclopentane, in the expandable polystyrene is in the range of 0.01 to 7 wt .-%, preferably 0.01 to 4 wt .-%, particularly preferably 0.1 to 4 wt .-%, most preferably 0.5 to 3.5 wt .-%, each, based on the blowing agent-containing expandable polystyrene.
  • Expandable styrene polymers or expandable styrene copolymers have a relatively low content of blowing agent. Such polymers are also referred to as "low blowing agent.”
  • low blowing agent A well-suited process for producing low-blowing expandable polystyrene or expandable styrene copolymer is described in US 5,112,875, which is incorporated herein by reference.
  • the styrene polymers or styrene copolymers for example UV stabilizers, antioxidants, coating agents, water repellents, nucleating agents, plasticizers, flame retardants, soluble and insoluble inorganic and / or organic dyes, pigments, and athermane particles such as carbon black, graphite or aluminum powder , be added together or separately as additives.
  • additives for example UV stabilizers, antioxidants, coating agents, water repellents, nucleating agents, plasticizers, flame retardants, soluble and insoluble inorganic and / or organic dyes, pigments, and athermane particles such as carbon black, graphite or aluminum powder , be added together or separately as additives.
  • styrene copolymers can also be used. These styrene copolymers advantageously have at least 50% by weight, preferably at least 80% by weight, of copolymerized styrene.
  • comonomers come z. B. ⁇ -methyl styrene, nuclear halogenated styrenes, acrylonitrile, esters of acrylic or methacrylic acid of alcohols having 1 to 8 carbon atoms, N-vinylcarbazole, maleic acid (anhydride),
  • the polystyrene and / or styrene copolymer in copolymerized form contain a small amount of a chain splitter, d. H. a compound having more than one, preferably two, double bonds, such as divinylbenzene, butadiene and / or butanediol diacrylate.
  • the branching agent is generally used in amounts of from 0.0005 to 0.5 mol%, based on styrene.
  • Mixtures of different styrene (co) polymers can also be used.
  • styrene homopolymers or styrene copolymers are glass clear polystyrene (GPPS), impact polystyrene (HIPS), anionically polymerized polystyrene or impact polystyrene (A-IPS), styrene- ⁇ -methylstyrene copolymers, acrylonitrile
  • ABS butadiene-styrene polymers
  • SAN styrene-acrylonitrile
  • ASA acrylonitrile-styrene-acrylic ester
  • MVS methyl acrylate-butadiene-styrene
  • MABS methyl methacrylate-acrylonitrile-butadiene- Styrene
  • PPE polyphenylene ether
  • styrene homopolymer having a molecular weight in the range from 70,000 to 400,000 g / mol, particularly preferably 190,000 to 400,000 g / mol, very particularly preferably 210,000 to 400,000 g / mol.
  • the expandable styrene homopolymers or expandable styrene copolymers are expanded by heating to temperatures above their softening point, for example with hot air or preferably with steam and / or pressure change (often referred to as "foamed"), as described for example in Kunststoff Handbuch 1996, Volume 4 "polystyrene", Hanser 1996, pages 640-673 or US 5,112,875.
  • the expandable polystyrene or expandable styrene copolymer is usually in a conventional manner by suspension or by means of polymerization
  • the propellant expands, the polymer particles increase in size and cell structures are formed.
  • prefoamers This expansion is generally carried out in conventional frothing devices, often referred to as "prefoamers.” Such prefouchers may be stationary or mobile.
  • the expansion can be carried out in one or more stages.
  • the expandable polystyrene particles or expandable styrene copolymer particles are readily expanded to the desired final size.
  • Polystyrene particles or expandable Styrolcopolymerteilchen initially expanded to an intermediate size and then expanded in one or more further stages over a corresponding number of intermediate sizes to the desired final size.
  • the expansion is carried out in one stage.
  • the expandable polystyrene particles (styrene homopolymer particles) or expandable styrene copolymer particles contain, in contrast to the expanded ones Polystyrene particles or expanded Styrolcopolymerteilchen, usually no cell structures.
  • the content of blowing agent in the expanded styrene homopolymer (polystyrene) or expanded styrene copolymer, preferably expanded Styrolhomopolymerisat, is in the range of 0 to 5.5 wt .-%, preferably 0 to 3 wt .-%, particularly preferably 0 to 2.5 wt. -%, most preferably 0 to 2 wt .-%, each based on the expanded polystyrene or expanded styrene copolymer.
  • 0 wt .-% means herein that no propellant can be detected by the usual detection methods.
  • Styrene copolymer particles are used without further intermediate steps for the production of the light lignocellulose-containing substance.
  • Components A), C) or optionally D) are not intermediate steps in the sense of this invention.
  • Propellant reduction herein is the detectable reduction in propellant concentration in the collective of freshly expanded polystyrene particles or expanded styrenic copolymer particles with time as measured by conventional analytical techniques (for example, gas chromatography).
  • propellant reduction is intended here but also the other, with prolonged storage of the expanded polystyrene or expanded Styrolcopolymerteilchen, occurring changes in the expanded polystyrene or expanded styrene copolymer particles, for example, shrinkage or aging, include.
  • the expanded polystyrene particles or expanded styrene copolymer particles are continuously used to make the light lignocellulosic material. That is, expanding the expandable polystyrene particles or expandable styrenic copolymer particles into expanded polystyrene particles or expanded styrenic copolymer particles and their further use, preferably delivery to the plant for producing the lignocellulosic material, in a virtually uninterrupted time
  • the plant for producing the lignocellulose-containing substance usually also comprises a mixing device in which the component B) with the other
  • Components is mixed. In the promotion of expanded polystyrene particles or expanded
  • lignocellulosic material may be the route of the expanded
  • Polystyrene or expanded Styrolcopolymerteilchen contain one or more buffer containers in the main or shunt.
  • Styrolcopolymerteilchen carried out at the place of production of the light lignocellulosic, preferably light wood-containing material and the resulting expanded polystyrene or expanded Styrolcopolymerteilchen without further measures, for example, for propellant reduction, directly
  • Light lignocellulosic material preferably light wood-containing material
  • “Locally” herein means nearby, for example, within about 200 meters, or adjacent to the device in which the light wood-containing material is produced and optionally further processed.
  • Expanding the expandable polystyrene particles or
  • Expandable Styrolcopolymerteilchen carried out at the place of production of the light lignocellulosic, preferably light wood-containing material in a mobile foaming and the resulting expanded Polystyrene particles or expanded styrenic copolymer particles, for example, without further measures for propellant reduction, directly used further, for example fed directly into the apparatus for producing the light lignocellulosic material, preferably light wood-containing material.
  • "Locally” herein means nearby, for example in the vicinity of about 200 meters, or in the vicinity of the device in which the light wood-containing material is produced and optionally further processed.
  • Mobile frothing device herein means that the frothing device can be easily assembled and disassembled, or, preferably, is mobile, for example, mounted on a wheeled vehicle (eg, truck) or railcar.
  • a wheeled vehicle eg, truck
  • the expanded polystyrene or expanded styrene copolymer advantageously has a bulk density of from 10 to 100 kg / m 3 , preferably from 15 to 90 kg / m 3 , particularly preferably from 20 to 80 kg / m 3 , in particular from 40 to 80 kg / m 3 .
  • the expanded polystyrene or expanded styrene copolymer is advantageously in the form of spheres or beads having an average diameter in the range of 0.25 to 10 mm, preferably in the range of 0.4 to 8.5 mm, in particular in the range of 0.4 to 7 mm inserted.
  • the expanded polystyrene or expanded styrene copolymer spheres advantageously have a small surface area per volume, for example in the form of a spherical or elliptical particle.
  • the expanded polystyrene or expanded styrene copolymer spheres are advantageously closed-cell.
  • the open cell density according to DIN-ISO 4590 is usually less than 30%.
  • the expandable polystyrene or expandable styrene copolymer or the expanded polystyrene or expanded styrene copolymer has an antistatic coating.
  • antistatic agents the usual and common in the art substances can be used. Examples are N, N-bis (2-hydroxyethyl) -Ci 2 -C 18 -alkylamines,
  • Suitable ammonium salts contain on nitrogen in addition to alkyl groups 1 to 3 hydroxyl-containing organic radicals.
  • Suitable quaternary ammonium salts are, for example, those having on the nitrogen cation 1 to 3, preferably 2, identical or different alkyl radicals having 1 to 12, preferably 1 to 10 carbon atoms, and 1 to 3, preferably 2, the same or
  • hydroxyalkyl and hydroxyalkyl-polyoxyalkylene radicals are those which are formed by oxyalkylation of a nitrogen-bonded hydrogen atom and are derived from 1 to 10 oxyalkylene radicals, in particular oxyethylene and oxypropylene radicals.
  • antistatic agent a quaternary ammonium salt or an alkali metal salt, in particular the sodium salt of a C 12 -C 20 alkanesulfonate or mixtures thereof.
  • the antistatic agents can generally be added both as a pure substance and in the form of an aqueous solution.
  • the antistatic agent can be used in the process of producing polystyrene or
  • Styrene copolymer be added analogously to the usual additives or applied after the preparation of the polystyrene particles as a coating.
  • the antistatic agent is advantageously used in an amount of 0.05 to 6 wt .-%, preferably 0.1 to 4 wt .-%, based on the polystyrene or styrene copolymer.
  • the expanded plastic particles B preferably expanded polystyrene particles or expanded Styrolcopolymerteilchen, are advantageously also after the
  • the light lignocellulose material preferably light wood material, preferably multilayer lignocellulosic material, more preferably multilayer wood material, in a state before, in which their original shape is still recognizable.
  • the light lignocellulose material preferably light wood material, preferably multilayer lignocellulosic material, more preferably multilayer wood material.
  • melting of the expanded plastic particles that are on the surface of the lightweight material may occur
  • lignocellulosic preferably light wood-containing material or preferably of the multilayer lignocellulosic material, preferably wood-based material come.
  • the total amount of the expanded plastic particles B), based on the light lignocellulose-containing, preferably light wood-containing material, is in the range of 1 to 15 wt .-%, preferably 3 to 15 wt .-%, particularly preferably 3 to 12 wt .-%.
  • the total amount of expanded plastic particles B) with polystyrene and / or styrene copolymer as the only plastic particle component, based on the light lignocellulose-containing, preferably light wood-containing material is in Range of 1 to 15 wt .-%, preferably 3 to 15 wt .-%, particularly preferably 3 to 12 wt .-%.
  • expanded plastic particles B preferably expanded polystyrene particles or expanded styrene copolymer particles
  • lignocellulose particles preferably wood particles A
  • the Rossin-Rammler-Sperling-Bennet function is described for example in DIN 66145.
  • sieve analyzes are first carried out to determine the particle size distribution of the expanded plastic particles B) and
  • Lignocellulose particles preferably wood particles A
  • DIN 66165 Lignocellulose particles, preferably wood particles A
  • the Rosin-Rammler-Sperling-Bennet function is:
  • Highly suitable lignocellulose particles preferably wood particles A
  • Highly suitable light lignocellulosic, preferably wood-containing substances or multilayer lignocellulosic materials, preferably multilayer wood-based materials are obtained if, for the d'values according to Rosin-Rammler-Sperling-Bennet Lignocellulose particles, preferably wood particles A) and the particles of the expanded plastic particles B), the following relationship applies: d 'of the particles A) ⁇ 2.5 xd' of the particles B), preferably d 'of the particles A) ⁇ 2.0 * d' of the particles Particle B), particularly preferably d 'of the particles A) ⁇ 1, 5 * d' of the particles B), very particularly preferably d 'of the particles A) ⁇ d' of the particles B).
  • the binder C) is selected from the group consisting of aminoplast resin, phenol-formaldehyde resin and organic isocyanate having at least two
  • the binder C) contains the substances known to the person skilled in the art for aminoplasts or phenolformaldehyde resins and commonly referred to as hardeners, such as ammonium sulfate or ammonium nitrate or inorganic or organic acids, for example sulfuric acid, formic acid or acid regenerating substances, such as aluminum chloride, aluminum sulfate , in each case in the usual, small amounts, for example in the range of 0.1 wt .-% to 3 wt .-%, based on the total amount of aminoplast resin in the binder C).
  • hardeners such as ammonium sulfate or ammonium nitrate or inorganic or organic acids, for example sulfuric acid, formic acid or acid regenerating substances, such as aluminum chloride, aluminum sulfate , in each case in the usual, small amounts, for example in the range of 0.1 wt .-% to 3 wt .-%, based on the total amount of aminoplast resin
  • Phenol formaldehyde resins also called PF resins are known to the person skilled in the art, see for example Kunststoff-Handbuch, 2nd edition, Hanser 1988, Volume 10
  • “Duroplasts”, pages 12 to 40 are here polycondensation products of compounds with at least one, optionally partially substituted by organic radicals, carbamide group (the carbamide group is also called carboxamide) and an aldehyde, preferably formaldehyde, understood as well Aminoplastharz can all be used to those skilled in the art, preferably the aminoplast resins known for the production of wood-based materials Such resins and their preparation are described, for example, in Ullmanns Enzyklopadie der ischen Chemie, 4th, revised and expanded edition, Verlag Chemie, 1973, pages 403 to 424 A2, VCH Verlagsgesellschaft, 1985, pages 115 to 141 "Amino Resins" and in M. Dunky, P. Niemz, wood materials and glues, Springer 2002, pages 251 to 259 (UF resins) and pages 303 to 313 (MUF and UF with a small amount of melamine).
  • carbamide group the carbamide group is also called carboxamide
  • Preferred aminoplast resins are polycondensation products of compounds having at least one, also partially substituted by organic radicals,
  • aminoplast resins are urea-formaldehyde resins (UF resins), melamine-formaldehyde resins (MF resins) or melamine-containing urea-formaldehyde resins (MUF resins).
  • UF resins urea-formaldehyde resins
  • MF resins melamine-formaldehyde resins
  • UMF resins melamine-containing urea-formaldehyde resins
  • amino resins are urea-formaldehyde resins, for example Kaurit ® glue types from BASF SE. Furthermore, very preferred amino resins are polycondensation products of compounds having at least one, and partly with organic radicals
  • organic radicals amino group in the range of 0.3 to 1, 0, preferably 0.3 to 0.60, more preferably 0.3 to 0.45, most preferably 0.30 to 0.40 ,
  • very preferred aminoplast resins are polycondensation products of compounds having at least one amino group -NH 2 and formaldehyde, wherein the molar ratio of formaldehyde: -NH 2 group in the range of 0.3 to 1, preferably 0.3 to 0.60, particularly preferably 0 , 3 to 0.45, most preferably 0.30 to 0.40.
  • aminoplast resins are urea-formaldehyde resins (UF resins), melamine-formaldehyde resins (MF resins) or melamine-containing urea-formaldehyde resins (MUF resins), in which the molar ratio of formaldehyde: -NH 2 -
  • very preferred amino resins are urea-formaldehyde resins (UF resins), wherein the molar ratio of formaldehyde: -NH2 group in the range of 0.3 to 1, preferably 0.3 to 0.60, particularly preferably 0.3 to 0.45, most preferably 0.30 to 0.40.
  • UF resins urea-formaldehyde resins
  • the said aminoplast resins are usually used in liquid form, usually suspended in a liquid suspending agent, preferably in aqueous suspension, but may also be used as a solid.
  • the solids content of the aminoplast resin suspensions, preferably aqueous suspension is usually from 25 to 90% by weight, preferably from 50 to 70% by weight.
  • the solids content of the aminoplast resin in aqueous suspension can be determined according to Günter Zeppenfeld, Dirk Grunwald, adhesives in the wood and furniture industry, 2nd edition, DRW-Verlag, page 268.
  • To determine the solids content of aminoplast glues 1 g of aminoplast glue is accurately weighed into a weighing dish, finely distributed on the bottom and dried for 2 hours at 120 ° C. in a drying oven. After tempering to room temperature in a desiccator, the residue is weighed and calculated as a percentage of the initial weight.
  • aminoplast resins are prepared by known processes (see above Ullmann-Literatur “Aminoplasts” and “Amino Resins”, as well as literature Dunky et al.) By reacting the carbamido-containing compounds, preferably urea and / or melamine, with the aldehydes, preferably
  • Formaldehyde in the desired molar ratios Carbamidolidy: aldehyde, preferably in water as a solvent.
  • aldehyde preferably formaldehyde: optionally partially substituted with organic radicals amino group
  • NH 2 group-carrying monomers are preferably urea, melamine, more preferably urea.
  • the further component of the binder C) may be an organic isocyanate having at least two isocyanate groups.
  • organic isocyanate all those skilled in the art, preferably those known for the production of wood materials or polyurethanes,
  • organic isocyanates are used. Such organic isocyanates and their preparation and use are described, for example, in Becker / Braun, Kunststoff Handbuch, 3rd revised edition, Volume 7 "Polyurethane", Hanser 1993, pages 17 to 21, pages 76 to 88 and pages 665 to 671.
  • Preferred organic isocyanates are oligomeric isocyanates of 2 to 10,
  • Isocyanate group per monomer unit is the oligomeric organic compound.
  • Isocyanate PMDI Polymeric methylenediphenylene diisocyanate
  • PMDI products are the products of LUPRANAT ® type series of BASF SE, in particular LUPRANAT ® M 20 FB of BASF SE. It is also possible to use mixtures of the described organic isocyanates, the mixing ratio not being critical according to current knowledge.
  • the resin components of the binder C) can be used alone, for example, aminoplast resin as the sole resin component of the binder C) or organic isocyanate as the sole resin component of the binder C) or PF resin as the sole component of the binder C).
  • the resin components of the binder C) can also be used as a combination of two or more resin components of the binder C).
  • the total amount of the binder C), based on the light wood-containing material, is in the range from 3 to 50 wt .-%, preferably 5 to 15 wt .-%, particularly preferably 7 to 10 wt .-%.
  • the total amount of the organic isocyanate, preferably of the oligomeric isocyanate, is generally from 2 to 10, preferably from 2 to 8
  • Monomer unit particularly preferably PMDI, in the binder C), based on the light lignocellulose-containing, preferably light wood-containing substance in the range from 0 to 5 wt .-%, preferably 0.1 to 3.5 wt .-%, particularly preferably 0.5 to 1, 5 wt .-%.
  • the proportions of the amino resin to the organic isocyanate result from the above-described ratios of the binder aminoplast Resin to light lignocellulosic, preferably light wood-containing substance or the binder organic isocyanate to light
  • lignocellulosic preferably light wood-containing substance.
  • Preferred embodiments of the light wood-containing material contain 55 to 92.5 wt .-%, preferably 60 to 90 wt .-%, in particular 70 to 88 wt .-%, based on the light wood-containing material, wood particles, wherein the wood particles have an average density from 0.4 to 0.85 g / cm 3 , preferably 0.4 to 0.75 g / cm 3 , in particular 0.4 to 0.6 g / cm 3 , 3 to 25 wt .-%, preferably 3 to 15 wt .-%, in particular 3 to 10% by weight based on the light wood-containing material, polystyrene and / or styrene copolymer as component B) having a bulk density of 10 to 100 kg / m 3 , preferably 20 to 80 kg / m 3 , in particular 30 to 60 kg / m 3 and 3 to 40 wt .-%,
  • Binder C wherein the total amount of the aminoplast resin, preferably the urea-formaldehyde resin and / or melamine-urea-formaldehyde resin and / or melamine-formaldehyde resin, more preferably urea-formaldehyde resin, in the binder C), based on the light wood-containing material in the range of 1 to 45 wt .-%, preferably 4 to 14 wt .-%, particularly preferably 6 to 9 wt .-% and wherein the average density of the light wood-containing material in the range of 200 to 600 kg / m 3 , preferably in the range from 300 to 575 kg / m 3 .
  • the inventive light lignocellulosic preferably light wood-containing substance or the inventive
  • component D multilayered lignocellulose material, preferably multilayer wood material, other commercial additives known to the person skilled in the art are present as component D), for example water repellents, such as paraffin emulsions,
  • the present invention further relates to a process for producing a multi-layered lignocellulosic material containing at least three layers, wherein only the middle layer or at least a part of the middle layers contains a light lignocellulose-containing substance as defined in claims 1 to 4, wherein the components for the layered individual layers and pressed under elevated temperature and elevated pressure and wherein the expanded plastic particles B) are obtained from expandable plastic particles by expanding and the resulting expanded plastic particles without further intermediate steps to produce the light lignocellulosic material
  • the average density of the multilayer, preferably of the three-layer, lignocellulose material according to the invention, preferably Wood material is in the range of 300 kg / m 3 to 600 kg / m 3 , preferably in the range of 350 kg / m 3 to 600 kg / m 3 , particularly preferably in the range of 400 kg / m 3 to 500 kg / m 3 .
  • the expanded polystyrene particles or expanded styrene copolymer particles are continuously used to make the light lignocellulosic material and the multilayer lignocellulosic material. This means that the foaming of the expanded polystyrene particles or expanded styrene copolymer particles are continuously used to make the light lignocellulosic material and the multilayer lignocellulosic material. This means that the foaming of the expanded
  • promotion in the plant for the production of the lignocellulosic material and / or multilayer lignocellulosic material proceed in a temporally practically uninterrupted process chain.
  • a preferred embodiment for producing a multilayered lignocellulosic material and / or multilayer lignocellulosic material proceed in a temporally practically uninterrupted process chain.
  • Lignocellulose material the expandable plastic particles, as described in more detail above, foamed at the site of production of the light lignocellulosic material to expandable plastic particles.
  • the expandable plastic particles as described in more detail above, are foamed to form expanded plastic particles at the place of production of the light lignocellulose-containing substance in a mobile foaming device.
  • Middle layers in the sense of the invention are all layers that are not the outer layers.
  • the outer layers (usually called “cover layer (s)" have no expanded plastic particles B).
  • the multilayer lignocellulose material according to the invention preferably multilayer wood material, contains three lignocellulosic layers,
  • the binder used for the outer layers is usually an aminoplast resin, for example, urea-formaldehyde resin (UF), melamine-formaldehyde resin (MF), melamine-urea-formaldehyde resin (MUF) or the invention
  • aminoplast resin for example, urea-formaldehyde resin (UF), melamine-formaldehyde resin (MF), melamine-urea-formaldehyde resin (MUF) or the invention
  • the binder used for the outer layers is an aminoplast resin, more preferably a urea-formaldehyde resin, most preferably an aminoplast resin wherein the molar formaldehyde: -NH 2 - group ratio is in the range of 0.3 to 1.0.
  • the thickness of the multilayered lignocellulosic material according to the invention varies with the field of application and is generally in the range of 0.5 to 100 mm; preferably in the range of 10 to 40 mm, in particular 15 to 20 mm.
  • multilayer wood material is described below.
  • the chips After cutting the wood, the chips are dried. Thereafter, if necessary, coarse and fines are removed. The remaining chips are sorted by sieving or sifting in the air stream. The coarser material is used for the
  • Middle layer the finer used for the cover layers.
  • Overlay chips are glued separately from each other with components B) (only the middle layer (s)), C) (same or different for middle layer and outer layer) and optionally D) (middle layer and / or outer layers),
  • the component B) was obtained shortly before by expanding the expandable plastic particles and mixed directly and preferably continuously with the other components for the preparation of the middle layer.
  • the cover layer material is scattered on the forming belt, then the middle layer material - containing the components B), C) and optionally D) - and finally again cover layer material.
  • the three-layer chip cake thus produced is precompressed cold (usually at room temperature) and then pressed hot.
  • the pressing can be carried out by all methods known to the person skilled in the art. Usually, the wood particle cake is pressed at a press temperature of 150 0 C to 230 0 C to the desired thickness.
  • the pressing time is normally 3 to 15 seconds per mm plate thickness. This gives a three-layer chipboard.
  • light lignocellulose-containing preferably light wood-containing material according to the invention or multilayer lignocellulosic pulps according to the invention, preferably multilayer wood material, wherein a good mechanical stability is maintained.
  • the light lignocellulose-containing, preferably light wood-containing material according to the invention and multilayer lignucellulose material according to the invention, preferably multilayer wood-based material can be produced easily and even continuously; There is no need to convert the existing plants for the production of the multilayer wood-based materials according to the invention or storage space for the expanded plastic particles, for example for

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Materials Engineering (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Forests & Forestry (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)

Abstract

La présente invention a pour objet un procédé pour la fabrication d'un matériau lignocellulosique léger présentant une masse volumique moyenne comprise dans une plage allant de 200 à 600 kg/m3. Dans ce procédé, on mélange et on comprime ensuite à une température élevée et à une pression élevée, respectivement par rapport au matériau lignocellulosique : A) de 30 à 95 % en poids de particules de lignocellulose; B) de 1 à 25 % en poids de particules de matière plastique expansées présentant une masse volumique apparente comprise dans une plage allant de 10 à 100 kg/m3; C) de 3 à 50 % en poids d'un liant choisi dans le groupe comprenant une résine aminoplaste, une résine phénolformaldéhyde et un isocyanate organique possédant au moins deux groupes isocyanate et le cas échéant D) des additifs. Le procédé est caractérisé en ce que les particules de matière plastique expansées sont obtenues par expansion de particules de matière plastique expansibles et en ce que les particules de matière plastique expansées ainsi obtenues sont utilisées ultérieurement sans étapes intermédiaires supplémentaires pour la fabrication du matériau lignocellulosique léger.
EP10742800A 2009-08-13 2010-08-02 Matériaux lignocellulosiques légers possédant de bonnes propriétés mécaniques Withdrawn EP2464692A1 (fr)

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WO2011104640A1 (fr) 2010-02-24 2011-09-01 Basf Se Agent de polissage aqueux et copolymères greffés et leur utilisation dans un procédé pour le polissage de surfaces métalliques à motif gravé et non structurées
WO2011107365A1 (fr) * 2010-03-04 2011-09-09 Basf Se Matériaux lignocellulosiques ayant de bonnes propriétés mécaniques
US8623501B2 (en) 2010-03-04 2014-01-07 Basf Se Lignocellulose materials having good mechanical properties
US8920923B2 (en) * 2010-03-04 2014-12-30 Basf Se Lignocellulose materials having good mechanical properties
CA2875209A1 (fr) * 2012-07-02 2014-01-09 Basf Se Derives du bois multicouches legers a base de materiaux contenant de la lignocellulose comprenant un coeur et deux couches de recouvrement, contenant de la cellulose traitee, des fibres naturelles traitees, des fibres synthetiques ou des melanges de celles-ci dans le coeur
US20150017425A1 (en) 2013-07-05 2015-01-15 Basf Se Lignocellulose materials with coated expanded plastics particles
WO2015104349A2 (fr) 2014-01-13 2015-07-16 Basf Se Procédé servant à fabriquer des matériaux à base de lignocellulose
NL2015667B1 (en) 2015-10-27 2017-05-29 Synbra Tech B V A process for preparing a wood chip board.
US20220242007A1 (en) * 2016-03-21 2022-08-04 Bondcore öU Composite wood panels with corrugated cores and method of manufacturing same
CN109715733A (zh) * 2016-09-23 2019-05-03 巴斯夫欧洲公司 生产木质纤维素材料的方法
CN114290471B (zh) * 2021-11-17 2023-04-07 濮阳绿宇新材料科技股份有限公司 一种轻质蜜胺级阻燃泡沫木屑板及其制备方法

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