EP3145710A1 - Matériaux lignocellulosiques multicouches à l'intérieur desquels se situe une barrière contre l'humidité - Google Patents

Matériaux lignocellulosiques multicouches à l'intérieur desquels se situe une barrière contre l'humidité

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Publication number
EP3145710A1
EP3145710A1 EP15712358.9A EP15712358A EP3145710A1 EP 3145710 A1 EP3145710 A1 EP 3145710A1 EP 15712358 A EP15712358 A EP 15712358A EP 3145710 A1 EP3145710 A1 EP 3145710A1
Authority
EP
European Patent Office
Prior art keywords
vapor barrier
lignocellulosic
lignocellulose
multilayer
layers
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Withdrawn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
EP15712358.9A
Other languages
German (de)
English (en)
Inventor
Jens Assmann
Claus Fueger
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
Publication of EP3145710A1 publication Critical patent/EP3145710A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
    • B32B5/30—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being formed of particles, e.g. chips, granules, powder
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B21/00—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board
    • B32B21/04—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board comprising wood as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B21/08—Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board comprising wood as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B23/00—Layered products comprising a layer of cellulosic plastic substances, i.e. substances obtained by chemical modification of cellulose, e.g. cellulose ethers, cellulose esters, viscose
    • B32B23/04—Layered products comprising a layer of cellulosic plastic substances, i.e. substances obtained by chemical modification of cellulose, e.g. cellulose ethers, cellulose esters, viscose comprising such cellulosic plastic substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B23/08—Layered products comprising a layer of cellulosic plastic substances, i.e. substances obtained by chemical modification of cellulose, e.g. cellulose ethers, cellulose esters, viscose comprising such cellulosic plastic substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • B32B2307/7242—Non-permeable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • B32B2307/7242—Non-permeable
    • B32B2307/7246—Water vapor barrier
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2471/00—Floor coverings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2479/00—Furniture

Definitions

  • Multilayered lignocellulosic materials with internal vapor barrier Multilayered lignocellulosic materials with internal vapor barrier
  • the present invention relates to multilayer lignocellulosic materials in which at least one layer is a vapor barrier layer and at least one vapor barrier layer is below the surface of the lignocellulosic material.
  • thermoplastic a thermoset or aluminum foil is proposed here.
  • the present invention was therefore based on the object to remedy the aforementioned disadvantages.
  • lignocellulosic materials in which at least one layer is a vapor barrier layer and at least one vapor barrier layer is below the surface of the lignocellulosic material and the lignocellulosic material layers
  • a binder selected from the group consisting of amino resin, phenol formaldehyde resin, organic isocyanate having at least two isocyanate groups or mixtures thereof, optionally with a curing agent and
  • the vapor barrier contains 0.01 to 100 wt .-% of polyisobutylene, 0 to 99.99 wt .-% of other polymers and 0 to 20 wt .-% additives.
  • At least 2 (two) layers generally means 2 to 5 layers, ie 2, 3, 4 or 5 layers, preferably 2 to 4 layers, ie 2, 3 or 4 layers, particularly preferably 2 or 3 layers, in particular 2 Layers.
  • the multilayered lignocellulosic materials may additionally contain a vapor barrier on a surface. This vapor barrier is usually (jointly) applied with the other vapor barriers inside the multilayered lignocellulosic materials (or subsequently). However, the multilayered lignocellulosic materials can also be provided with this superficial vapor barrier in a subsequent step.
  • the spread mixture may be separated into at least two (two) layers after being forced.
  • Methods for the separation of the layers for example with band saws or steam swords, are known to the person skilled in the art (see Barbu, M., Lerkach, K. Pölzleitner, F .: Holztechnologie 46 (2005) 1, pages 40 to 44, WO-A -2007/76741 and DE-A-10 2004 006385).
  • the vapor barrier is introduced in each case and the layers are superimposed and pressed (hot pressed).
  • pre-compression under elevated pressure usually a pressure of 5 to 40 bar, preferably 10 to 30 bar, more preferably 15 to 20 bar and optionally elevated temperature usually a temperature of 15 to 80 ° C, preferably 15 to 50 ° C, more preferably 15 to 28 ° C (room temperature) (so-called “cold compression”).
  • cold compression In the final compression (so-called. "Hot compression”) is meant at elevated temperature usually a temperature of 130 to 250 ° C, preferably 150 to 230 ° C and under elevated pressure, a pressure of 3 to 70 bar, preferably 4 to 60 bar, more preferably 5 to 50 bar
  • the pressing time is usually between 1 and 120 seconds, preferably between 2 and 60 seconds, more preferably between 3 and 15 seconds per mm plate thickness.
  • two mixtures can also be spread and elevated pressure and optionally pre-pressed under elevated temperature and then coated on top of each other, between these layers a vapor barrier containing 0.01 to 100 wt .-% polyisobutylene, and then all pressed under elevated temperature and under increased pressure.
  • the number of internal vapor barriers, which can be introduced into the lignocellulosic material by the process according to the invention, is arbitrary; as a rule, it is one to four, preferably one to three, more preferably one or two vapor barriers, in particular a vapor barrier.
  • one or more, ie 1 to 4 internal vapor barriers are 5 to 50%, preferably 7 to 30%, particularly preferably 8 to 20% below the surface of the (finished compressed) multilayer lignocellulose materials.
  • the distance of the vapor barriers is usually 1 to 50 mm, preferably 2 to 35 mm, more preferably 3 to 25 mm, most preferably 5 to 15 mm.
  • the vapor barrier can be introduced as granules or as a film, preferably as a film.
  • the vapor barrier contains 0.01 to 100 wt .-%, preferably 0.1 to 50 wt .-%, preferably 0.5 to 10 wt .-%, particularly preferably 0.8 to 8 wt .-% polyisobutylene
  • Suitable polyisobutylene are polyisobutylenes having a molecular weight (M w in g / mol) of 5,000 to 10,000,000, preferably 10,000 to 5,000,000, particularly preferably 35,000 to
  • polystyrene resin polystyrene resin
  • polystyrene resin polystyrene resin
  • polyamides such as PA6 or PA6.6 or PA4.6 or PA12 or copolyamides PA6 / 6.6 or PA6.6.6 / 12, preferably polyolefins or polyamides, more preferably polyethylenes such as LDPE (Low Density Polyethylene) or LLDPE (Linear Low Density Polyethylene).
  • LDPE Low Density Polyethylene
  • LLDPE Linear Low Density Polyethylene
  • Suitable additives are, for example
  • Pigments e.g. Color pigments such as titanium dioxide,
  • Light stabilizers such as benzotriazoles, for example Tinuvin® 326 from BASF SE or hindered amines, for example Tinuvin® 770 from BASF SE or Chimasorb® 2020 from BASF SE
  • Antioxidants such as organophosphites, for example Irgafos® 126 from BASF SE or hindered phenols Irganox® 1010 from BASF SE.
  • the vapor barrier usually has a thickness of 0.005 to 5 mm, preferably 0.01 to 3 mm, more preferably 0.05 to 1 mm, most preferably 0.05 to 0.5 mm.
  • veneered chip, OSB (oriented beach board) or fiber materials in particular wood fiber materials such as LDF, MDF and HDF materials, preferably chipboard or fiber materials, particularly preferably fiber materials are understood in this context.
  • Materials are u.a. Plates, tiles, moldings, semi-finished products or composites, preferably plates, tiles, moldings or composites, particularly preferably plates.
  • Lignocellulosic substances are substances that contain lignocellulose.
  • the content of lignocellulose can be varied within wide ranges and is generally from 20 to 100% by weight, preferably from 50 to 100% by weight, particularly preferably from 85 to 100% by weight, in particular 100% by weight lignocellulose.
  • the term lignocellulose is known to the person skilled in the art.
  • Suitable as one or more lignocellulose-containing substances are, for example, straw, wood-fiber-containing plants, wood or mixtures thereof.
  • a plurality of lignocellulose-containing substances are understood as meaning 2 to 10, preferably 2 to 5, particularly preferably 2 to 4, in particular 2 or 3, different lignocellulose-containing substances.
  • Suitable wood materials are wood fibers or wood particles such as wood layers, wood strips, wood chips, wood dust or mixtures thereof, preferably wood chips, wood fibers, wood dust or mixtures thereof, particularly preferably wood chips, wood fibers or mixtures thereof.
  • wood fibers or wood particles such as wood layers, wood strips, wood chips, wood dust or mixtures thereof, preferably wood chips, wood fibers, wood dust or mixtures thereof, particularly preferably wood chips, wood fibers or mixtures thereof.
  • flax, hemp or mixtures thereof are suitable as wood fiber-containing plants.
  • Starting materials for wood particles or wood fibers are usually thinning woods, industrial timbers and used woods as well as wood fiber-containing plants or plant parts.
  • any kind of wood comes into question, preferably spruce, beech, pine, larch, linden, poplar, ash, chestnut, tan pine or mixtures thereof, particularly preferably spruce, beech or mixtures thereof, in particular spruce.
  • the lignocellulose-containing substances are comminuted according to the invention as a rule and used as particles or particles.
  • particles are sawdust, wood chips, wood shavings, wood particles, optionally crushed cereal straw, shives, cotton stalks or mixtures thereof, preferably sawdust, wood shavings, wood chips, wood particles, shives or mixtures thereof, particularly preferably sawdust, wood shavings, wood chips, wood particles or their mixtures.
  • the dimensions of the comminuted lignocellulosic materials are not critical and depend on the lignocellulosic material to be produced.
  • Large chips, which are used, for example, for the production of OSB boards are also called strands.
  • the average size of the particles for producing OSB boards, strands is generally 20 to 300 mm, preferably 25 to 200 mm, particularly preferably 30 to 150 mm.
  • the required particles can be classified by sieve analysis in size.
  • the sieve analysis is described, for example, in DIN 4188 or DIN ISO 3310.
  • the average size of the particles is generally 0.01 to 30 mm, preferably 0.05 to 25 mm, particularly preferably 0.1 to 20 mm.
  • Suitable fibers are wood fibers, cellulose fibers, hemp fibers, cotton fibers, bamboo fibers, miscanthus, bagasse or mixtures thereof, preferably wood fibers, hemp fibers, bamboo fibers, miscanthus, bagasse or mixtures thereof, particularly preferably wood fibers, bamboo fibers or mixtures thereof.
  • the length of the fibers is generally 0.01 to 20 mm, preferably 0.05 to 15 mm, particularly preferably 0.1 to 10 mm.
  • the particles or fibers are usually sorted, i. When only one of the aforementioned varieties (e.g., shavings, wood shavings or wood fibers) is used, they are mixtures whose individual parts, particles or fibers differ in size and shape.
  • the preparation of the desired lignocellulose-containing substances can be carried out by methods known per se (see, for example: M. Dunky, P. Niemz, wood materials and glues, pages 91 to 156, Springer Verlag Heidelberg, 2002).
  • the lignocellulose-containing substances can be obtained by customary methods known to those skilled in the art of drying with the then customary small amounts of water (in a customarily small fluctuation range, so-called "residual moisture"), this water is not taken into account in the weight data of the present invention.
  • the average density of the lignocellulose-containing substances according to the invention is arbitrary and depends only on the lignocellulose-containing substance used and is generally 0.2 to 0.9 g / cm 3 , preferably 0.4 to 0.85 g / cm 3 , particularly preferably at 0.4 to 0.75 g / cm 3 , in particular at 0.4 to 0.6 g / cm 3 .
  • HDF high density fiberboard
  • MDF medium density fibreboard
  • LDF light fibreboard
  • Component B) are expanded plastic particles which are coated before, during or after the expansion with at least one binder.
  • Expanded plastic particles preferably expanded thermoplastic particles
  • expandable plastic particles preferably expandable thermoplastic particles. Both are based on or consist of polymers, preferably thermoplastic polymers, which can be foamed. These are known to the person skilled in the art.
  • polystyrene polystyrene resin
  • polystyrene polystyrene resin
  • PVC hard and soft
  • polycarbonates polystyrene resins
  • polyisocyanurates polycarbodiimides
  • polyacrylimides and polymethacrylimides polyamides
  • polyurethanes aminoplast resins and phenolic resins
  • polystyrene homopolymers also referred to below as "polystyrene”
  • styrene polymer styrene polymer
  • styrene copolymers C 2 -C 10 -olefin homopolymers, C 2 -C 10 -olefin copolymers, polyesters or mixtures thereof, preferably PVC (hard and soft), polyurethanes, styrene homopolymer, styrene copolymer or mixtures thereof, particularly preferably styrene homopolymer , Styrolcopolymeri- sat or mixtures thereof, in particular styrene homopolymer, styrene copolymer or mixtures thereof.
  • PVC hard and soft
  • polyurethanes styrene homopolymer, styrene copolymer or mixtures thereof, particularly preferably styrene homopolymer , Styrolcopolymeri- sat or mixtures thereof, in particular styrene homopolymer
  • the preferred or particularly preferred expandable styrene polymers or expandable styrene copolymers described above 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 styrenic copolymer is described in US-A-5,112,875, which is incorporated herein by reference.
  • 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. As comonomers come z.
  • ⁇ -methyl styrene As ⁇ -methyl styrene, ring-halogenated styrene, acrylonitrile, esters of acrylic or methacrylic acid of alcohols having 1 to 8 carbon atoms, N-vinylcarbazole, maleic acid (anhydride), (meth) acrylamides and / or vinyl acetate into consideration.
  • the polystyrene and / or styrene copolymer in copolymerized form contain a small amount of a chain branching, 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-butadiene-styrene polymers (ABS), styrene-acrylonitrile (SAN ), Acrylonitrile-styrene-acrylic esters (ASA), methyl acrylate-butadiene-styrene (MBS), methyl methacrylate-acrylonitrile-butadiene-styrene (MABS) polymers or mixtures thereof or with polyphenylene ether (PPE).
  • GPPS glass clear polystyrene
  • HIPS impact polystyrene
  • A-IPS anionically polymerized polystyrene or impact poly
  • styrene polymers Preference is given to using styrene polymers, styrene copolymers or styrene homopolymers 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.
  • Such polystyrene and / or styrene copolymer can be prepared by all known in the art polymerization process, see, for. B. Ullmann's Encyclopedia, Sixth Edition, 2000 Electronic Release or Plastics Handbook 1996, Volume 4 "Polystyrene", pages 567 to 598.
  • the expanded plastic particles are generally in the form of spheres or beads having an average diameter of 0.25 to 10 mm, preferably 0.4 to 8.5 mm, particularly preferably 0.4 to 7 mm, in particular in the range of 1, 2 used to 7 mm and advantageously have a small surface per volume, for example in the form of a spherical or ellipti- see particle.
  • the expanded plastic particles are advantageously closed-cell.
  • the off-set to DIN-ISO 4590 is usually less than 30%.
  • the expanded plastic particles have a bulk density of from 10 to 150 kg / m 3 , preferably from 30 to 100 kg / m 3 , particularly preferably from 40 to 80 kg / m 3 , in particular from 50 to 70 kg / m 3 .
  • the bulk density is usually determined by weighing a volume filled with the bulk material.
  • the expanded plastic particles only have a low content of propellant, if at all.
  • the content of blowing agent in the expanded plastic particle is generally in the range of 0 to 5.5 wt .-%, preferably 0 to 3 wt .-%, preferably 0 to 2.5 wt .-%, particularly preferably 0 to 2 wt. -%, in each case based on the expanded polystyrene or expanded styrene copolymer.
  • 0 wt .-% means herein that no propellant can be detected by the usual detection methods.
  • expanded plastic particles can be used further without or with, preferably without further measures for blowing agent reduction and particularly preferably without further intermediate steps for the preparation of the lignocellulose-containing substance.
  • the expandable polystyrene or expandable styrene copolymer or the expanded polystyrene or expanded styrene copolymer usually has an antistatic coating.
  • the expanded plastic particles can be obtained as follows:
  • Compact expandable plastic particles usually solids that generally have no cell structure containing an expansible medium (also called “propellant”), are expanded by the action of heat or pressure change (often referred to as “frothing”).
  • propellant expands, the particles increase in size and cell structures arise.
  • pre-expanders This expansion is generally carried out in conventional frothing devices, often referred to as "pre-expanders.” Such pre-expanders can be fixed in place or mobile.
  • the expansion can be carried out in one or more stages.
  • 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 in one or more further stages expanded over a corresponding number of intermediate sizes to the desired final size.
  • the expansion is carried out in one stage.
  • the expandable styrene homopolymers or expandable Styrolcopolymens in a known manner by heating to temperatures above its softening point, for example with hot air or preferably steam and or pressure change expanded (often also referred to as "foamed"), as described for example in Kunststoff Handbuch 1996, Volume 4 "Polystyrene", Hanser 1996, pages 640 to 673 or US-A-5,112,875.
  • the expandable polystyrene or expandable styrene copolymer is generally obtainable in a manner known per se by suspension polymerization or by extrusion processes as described above. During expansion, the propellant expands, the polymer particles increase in size and cell structures are formed.
  • the production of the expandable polystyrene and / or styrene copolymer is generally carried out in a conventional manner by suspension polymerization or by extrusion.
  • suspension polymerization styrene, if appropriate with the addition of further comonomers, is polymerized in aqueous suspension in the presence of a customary suspension stabilizer by means of free-radical-forming catalysts.
  • the blowing agent and, if appropriate, further additives may be introduced during the polymerization or may be added to the batch in the course of the polymerization or after the end 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.
  • the resulting expanded plastic particles or the coated expanded plastic particles can be stored and transported.
  • blowing agents are all blowing agents known to those skilled in the art, for example aliphatic C3- to Cio-hydrocarbons such as propane, n-butane, isobutane, n-pentane, isopentane, neopentane, cyclo-pentane and / or hexane and its isomers, alcohols, ketones , Esters, ethers, halogenated hydrocarbons or mixtures thereof, preferably n-pentane, isopentane, neopentane, cyclopentane or a mixture thereof, particularly preferably commercially available Pentanisomeren- mixtures of n-pentane and iso-pentane.
  • aliphatic C3- to Cio-hydrocarbons such as propane, n-butane, isobutane, n-pentane, isopentane, neopentane, cyclo-pentane and
  • the content of blowing agent in the expandable plastic particles is generally in the range of 0.01 to 7 wt .-%, preferably 0.01 to 4 wt .-%, preferably 0.1 to 4 wt .-%, particularly preferably 0.5 to 3.5 wt .-%, each based on the propellant-containing expandable polystyrene or styrene copolymer.
  • Suitable coating compositions for the expandable or expanded plastic particles are all compounds of component C and compounds K, which form a sticky layer, or mixtures thereof, preferably all compounds of component C and compounds K, which form a sticky layer, particularly preferably all compounds of the component C.
  • coating agent and component C in the lignocellulose material may be the same or different, preferably the same.
  • Suitable compounds K which form a sticky layer are polymers based on monomers such as vinylaromatic monomers, such as ⁇ -methylstyrene, p-methylstyrene, ethylstyrene, tert-butylstyrene, vinylstyrene, vinyltoluene, 1,2-diphenylethylene, 1,1- Diphenylethylene, alkenes such as ethylene or propylene, dienes such as 1, 3-butadiene, 1, 3-pentadiene, 1, 3-hexadiene, 2,3-dimethylbutadiene, isoprene, piperylene or isoprene, ⁇ -ß-unsaturated carboxylic acids such as acrylic acid and methacrylic acid, their esters, in particular alkyl esters such as C 1 to C 10 alkyl esters of acrylic acid, in particular the butyl esters, preferably n-butyl acrylate, and the C 1 to C 10 alkyl est
  • These polymers may optionally contain from 1 to 5% by weight of comonomers, such as (meth) acrylonitrile, (meth) acrylamide, ureido (meth) acrylate, 2-hydroxyethyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, acrylamidopropanesulfonic acid, methyl- lolacrylamide or the sodium salt of vinylsulfonic acid.
  • comonomers such as (meth) acrylonitrile, (meth) acrylamide, ureido (meth) acrylate, 2-hydroxyethyl (meth) acrylate, 3-hydroxypropyl (meth) acrylate, acrylamidopropanesulfonic acid, methyl- lolacrylamide or the sodium salt of vinylsulfonic acid.
  • These polymers are preferably composed of one or more of the monomers styrene, butadiene, acrylic acid, methacrylic acid, C 1 -C 4 -alkyl acrylates, C 1 -C 4 -alkyl methacrylates, acrylamide, methacrylamide and methylolacrylamide.
  • acrylate resins are particularly suitable, particularly preferably in the form of the aqueous polymer dispersion, and also homo-oligomers or homopolymers of ⁇ - ⁇ -unsaturated carboxylic acids or their anhydrides, and co-oligomers or copolymers of ⁇ - ⁇ -unsaturated carboxylic acids and / or their Anhydrides with ethylenically unsaturated co-monomers.
  • Suitable polymer dispersions are obtainable, for example, by free-radical emulsion polymerization of ethylenically unsaturated monomers, such as styrene, acrylates, methacrylates or mixtures thereof, as described in WO-A-00/50480, preferably pure acrylates or styrene acrylates, which are selected from the monomers styrene, n Butyl acrylate, methyl methacrylate (MMA), methacrylic acid, acrylamide or methylolacrylamide.
  • the preparation of the polymer dispersion or suspension can be carried out in a manner known per se, for example by emulsion, suspension or dispersion polymerization, preferably in the aqueous phase. It is also possible to prepare the polymer by solution or bulk polymerization, optionally dicing and then dispersing the polymer particles in water in a customary manner.
  • the coating composition can be brought into contact with the expandable plastic particle (ie before expansion, "variant I") or during expansion of the expandable plastic particles (ie during expansion, “variant II") or with the expanded plastic particle (ie after expansion, "Variant III"), preferably variant (III) is used.
  • coated plastic particles of the invention can be prepared, for example, by
  • plastic particles preferably non-expandable plastic particles, melts, one or more coating agents and propellants in any order, mixed as homogeneously as possible and foamed into foam particles,
  • this can be brought into contact with the customary processes, for example by spraying, dipping, wetting or tumbling the expandable or expanded plastic particles with the coating agent at a temperature of 0 to 150 ° C., preferably 10 to 120 ° C., particularly preferably 15 to 1 10 ° C and a pressure of 0.01 to 10 bar, preferably 0.1 to 5 bar, more preferably at atmospheric pressure (atmospheric pressure);
  • the coating composition is preferably added in the so-called prefoamer under the abovementioned conditions.
  • Suitable binders are resins such as phenol-formaldehyde resins, amino resins, organic isocyanates having at least 2 isocyanate groups or mixtures thereof.
  • the resins may be used alone, as a sole resin component or a combination of two or more resin components of the different resins of the group of phenol-formaldehyde resins, aminoplast resins and organic isocyanates having at least 2 isocyanate groups.
  • Phenol-formaldehyde resins are known to the person skilled in the art, see, for example, Kunststoff-Handbuch, 2nd edition, Hanser 1988, Volume 10 "Duroplastics", pages 12 to 40. amino resins
  • aminoplast resins it is possible to use all the aminoplast resins known to the person skilled in the art, preferably those known for the production of wood-based materials. Such resins and their preparation are described, for example, in Ullmann's Enzyklopadie der ischen Chemie, 4th, revised and expanded edition, Verlag Chemie, 1973, pages 403 to 424 "Aminoplasts” and Ullmann's Encyclopedia of Industrial Chemistry, Vol. A2, VCH Verlagsgesellschaft, 1985, pages 15 to 141 "Amino Resins” and in M. Dunky, P.
  • the setting of the desired molar ratio of aldehyde, preferably formaldehyde, to the optionally partially substituted with organic radicals amino group can also by addition of -NH2 group-carrying monomers to formaldehyde-rich finished, preferably commercial, Aminoplastharzen done.
  • NH 2 group-carrying monomers are preferably urea, melamine or mixtures thereof, more preferably urea.
  • Preferred amino resins are polycondensation products of compounds having at least one, optionally partially substituted by organic radicals, carbamide group (the carbamide group is also referred to as carboxamide) and an aldehyde, preferably formaldehyde understood; most preferably urea-formaldehyde resins (UF-resins), melamine-formaldehyde resins (MF-resins) or melamine-containing urea-formaldehyde resins (MUF-resins), in particular urea-formaldehyde resins, for example Kaurit ® glue types from BASF SE.
  • carbamide group the carbamide group is also referred to as carboxamide
  • aldehyde preferably formaldehyde understood
  • urea-formaldehyde resins urea-formaldehyde resins
  • MF-resins melamine-formaldehyde resins
  • UMF-resins mel
  • very preferred aminoplast resins are polycondensation products of compounds having at least one, also partially substituted by organic radicals, amino group and aldehyde, wherein the molar ratio of aldehyde to optionally partially substituted with organic radicals amino group in the range of 0.3: 1 to 1: 1 , preferably 0.3: 1 to 0.6: 1, particularly preferably 0.3: 1 to 0.45: 1, very particularly preferably 0.3: 1 to 0.4: 1.
  • the aminoplast resins mentioned are usually suspended in liquid form, usually in a liquid medium, preferably in aqueous suspension or else as solid.
  • the solids content of the aminoplast resin suspensions is usually from 25 to 90% by weight, preferably from 50 to
  • the solids content of the aminoplast resin in aqueous suspension can according to Günter Zeppenfeld, Dirk Grunwald, adhesives in the wood and furniture industry, 2nd edition, DRW-Verlag, page 268 be determined.
  • To determine the solids content of aminoplast glues 1 g of aminoplast glue is weighed exactly 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.
  • the weight of the binder refers with respect to the aminoplast component in the binder on the solids content of the corresponding component (determined by evaporation of water at 120 ° C, within 2 h after Günter Zeppenfeld, Dirk Grunwald, adhesives in the wood and furniture industry, 2 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.
  • Suitable organic isocyanates are organic isocyanates having at least two isocyanate groups or mixtures thereof, in particular all those skilled in the art, preferably the known for the production of wood materials or polyurethanes, organic isocyanates or mixtures thereof.
  • 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 having 2 to 10, preferably 2 to 8 monomer units and an average of at least one isocyanate group per monomer unit or mixtures thereof, particularly preferably the oligomeric organic isocyanate PMDI ("Polymered Methylendiphenylendiisocyanat") which is obtainable by condensation formaldehyde with aniline and phosgenation of the isomers and oligomers formed in the condensation (see, for example, Becker / Braun, Kunststoff Handbuch, 3rd revised edition, Volume 7 "Polyurethane", Hanser 1993, pages 18 last paragraph to page 19, second paragraph and page 76, fifth paragraph), very particularly preferably products of the LUPRANAT ® type series of BASF SE, in particular LUPRANAT ® M 20 FB of BASF SE.
  • PMDI Polymered Methylendiphenylendiisocyanat
  • Hardener in the component C may contain hardeners known to the person skilled in the art or mixtures thereof.
  • Suitable hardeners for aminoplast resins or phenolformaldehyde resins are those which catalyze the further condensation, such as acids or their salts or aqueous solutions of these salts.
  • Suitable acids are inorganic acids such as HCl, HBr, Hl, H 2 SO 3, H 2 SO 4, phosphoric acid, polyphosphoric acid, nitric acid, sulfonic acids, for example p-toluenesulfonic acid, methanesulfonic acid, trifluoromethanesulfonic acid, nonafluorobutanesulfonic acid, carboxylic acids such as Cr to Cs-carboxylic acids, for example formic acid, acetic acid, Propionic acid or mixtures thereof, preferably inorganic acids such as HCl, H2SO3, H2SO4, phosphoric acid, polyphosphoric acid, nitric acid, sulfonic acids such as p-toluenesulfonic acid, methanesulfonic acid, carboxylic acids such as C to Cs carboxylic acids, for example formic acid, acetic acid, particularly preferably inorganic acids such as H2SO4, Phosphoric acid, ni
  • Suitable salts are halides, sulfites, sulfates, hydrogen sulfates, carbonates, hydrogencarbonates, nitrites, nitrates, sulfonates, salts of carboxylic acids such as formates, acetates, propionates, preferably sulfites, carbonates, nitrates, sulfonates, salts of carboxylic acids such as formates, acetates , Propionates, particularly preferably sulfites, nitrates, sulfonates, salts of carboxylic acids such as formates, acetates, propionates, of protonated, primary, secondary and tertiary aliphatic amines see, alkanolamines, cyclic aromatic amines such as Cr to Cs-amines, isopropylamine , 2-ethylhexylamine, di- (2-ethylhexyl) amine, diethylamine
  • Particularly suitable salts are: ammonium chloride, ammonium bromide, ammonium iodide, ammonium sulfate, ammonium sulfite, ammonium hydrogen sulfate, ammonium methanesulfonate, ammonium p-toluenesulfonate, ammonium trifluoromethanesulfonate, ammonium nonafluorobutanesulfonate, ammonium phosphate, ammonium nitrate, ammonium formate, ammonium acetate, morpholinium chloride, morpholinium bromide, morpholinium iodide, morpholinium sulfate, Morpholiniumsulfit, Morpholiniumhydrogensulfat, Morpholiniummethansulfonat, morpholinium p-toluenesulfonate, Morpholiniumtrifluormethansulfonat, Morpholiniumnonafluorbutans
  • the salts are used in the form of their aqueous solutions.
  • aqueous solutions are understood as meaning dilute, saturated, supersaturated and also partially precipitated solutions, as well as saturated solutions having a solids content of insoluble salt.
  • Phenol-formaldehyde resins may also be cured alkaline, preferably with carbonates or hydroxides, such as potassium carbonate and sodium hydroxide.
  • organic isocyanate hardeners with at least two isocyanate groups can be subdivided into four groups: amines, further bases, metal salts and organometallic compounds, preference being given to amines.
  • Such hardeners are described, for example, in Michael Szycher, Szycher's Handbook of Polyurethanes, CRC Press, 1999, pages 10-1 to 10-20.
  • compounds which greatly accelerate the reaction of reactive hydrogen atoms, in particular hydroxyl groups, containing compounds with the organic isocyanates are also suitable.
  • basic polyurethane catalysts as curing agents, for example tertiary amines, such as triethylamine, tributylamine, dimethylbenzylamine, dicyclohexylmethylamine, dimethylcyclohexylamine, ⁇ , ⁇ , ⁇ ', ⁇ '-tetramethyldiaminodiethyl ether, bis (dimethylamino-propyl) -urea, N -Methyl or N-ethylmorpholine, N-cyclohexylmorpholine, ⁇ , ⁇ , ⁇ ', ⁇ '-tetramethylethylenediamine, ⁇ , ⁇ , ⁇ ', ⁇ '-tetramethylbutanediamine, ⁇ , ⁇ , ⁇ ', ⁇ '-tetramethylhexanediamine -1, 6, pentamethyldiethylenetriamine, dimethylpiperazine, N-dimethylaminoethylpipe
  • alkanolamine compounds such as triethanolamine, triisopropanolamine, N-methyl- and N-ethyldiethanolamine, dimethylaminoethanol, 2- (N, N-dimethylaminoethoxy) ethanol, N, N ', N "-tris- (dialkylaminoalkyl) hexahydrotriazines, eg N , N ', N "-Tris- (dimethylaminopropyl) -s-hexahydro- triazine, and triethylenediamine.
  • alkanolamine compounds such as triethanolamine, triisopropanolamine, N-methyl- and N-ethyldiethanolamine, dimethylaminoethanol, 2- (N, N-dimethylaminoethoxy) ethanol, N, N ', N "-tris- (dialkylaminoalkyl) hexahydrotriazines, eg N , N ', N
  • Suitable organometallic compounds are organometallic salts such as iron (II) chloride, zinc chloride, lead octoate and preferably tin salts, such as tin dioctoate, tin diethylhexoate and dibutyltin dilaurate, and in particular mixtures of tertiary amines and organic tin salts.
  • organometallic salts such as iron (II) chloride, zinc chloride, lead octoate and preferably tin salts, such as tin dioctoate, tin diethylhexoate and dibutyltin dilaurate, and in particular mixtures of tertiary amines and organic tin salts.
  • Suitable further bases are amidines, such as 2,3-dimethyl-3,4,5,6-tetrahydropyrimidine, tetraalkylammonium hydroxides, such as tetramethylammonium hydroxide, alkali metal hydroxides, such as sodium hydroxide and alkali metal alkoxides, such as sodium methylate and potassium isopropylate, and alkali metal salts of long-chain fatty acids with 10 to 20 carbon atoms and optionally pendant OH groups.
  • amidines such as 2,3-dimethyl-3,4,5,6-tetrahydropyrimidine
  • tetraalkylammonium hydroxides such as tetramethylammonium hydroxide
  • alkali metal hydroxides such as sodium hydroxide and alkali metal alkoxides, such as sodium methylate and potassium isopropylate
  • alkali metal salts of long-chain fatty acids with 10 to 20 carbon atoms and optionally pendant OH groups.
  • curing agents for aminoplast resins can be found in M. Dunky, P. Niemz, wood materials and glues, Springer 2002, pages 265 to 269, such phenolformaldehyde hardeners.
  • Hydrocarbons can be found in M. Dunky, P. Niemz, wood materials and glues, Springer 2002, pages 341 to 352 and such hardeners for organic isocyanates having at least 2 isocyanate groups can be found in M. Dunky, P. Niemz, wood materials and glues, Springer 2002 , Pages 385 to 391.
  • the lignocellulose materials according to the invention may be known to those skilled in and commercially available additives as component D in amounts of 0 to 68 wt .-%, preferably 0 to 10 wt .-%, particularly preferably 0.5 to 8 wt .-%, in particular 1 to 3 wt .-% contain.
  • Suitable additives are, for example, water repellents such as paraffin emulsions, antifungal agents, formaldehyde scavengers such as urea or polyamines, and flame retardants, extenders, fillers. Further examples of additives can be found in M. Dunky, P. Niemz, Holzwerkstoffe und Leime, Springer 2002, pages 436 to 444.
  • the total amount of the coating agent on the expanded plastic particles B) (based on the amount of uncoated plastic particles) is in the range from 0.01 to 20% by weight, preferably 0.05 to 15% by weight, particularly preferably 0 , 1 to 10 wt .-%.
  • the coated, expanded plastic particles B) are also in a virtually unmelted state after they have been pressed into the lignocellulose material, preferably wood-based material, preferably multilayered lignocellulose material, more preferably multilayer wood material.
  • the plastic particles B) have generally not penetrated into the lignocellulosic particles or impregnated them, but are distributed between the lignocellulosic particles.
  • the plastic particles B) can be separated from the lignocellulose by physical processes, for example after comminuting the ligucocellulosic material.
  • the total amount of the coated, expanded plastic particles B), based on the monocellulose-containing, preferably wood-containing material, is in the range from 1 to 25% by weight, preferably 3 to 20% by weight, particularly preferably 5 to 15% by weight. -%.
  • the total amount of the binder C), based on the lignocellulosic substances, is generally in the range of 1 to 50 wt .-%, preferably 2 to 15 wt .-%, particularly preferably 3 to 10 wt .-%, wherein the amount
  • a) of the phenol-formaldehyde resin based on the lignocellulose substances, as a rule in the range from 0 to 50% by weight, preferably 4 to 20% by weight, particularly preferably 5 to 15
  • Wt .-%, b) of the aminoplast resin (calculated as a solid based on the lignocellulosic substances usually in the range of 0 to 45 wt .-%, preferably 4 to 20 wt .-%, particularly preferably 5 to 15 wt .-% and
  • c) of the organic isocyanate based on the lignocellulosic substances usually in the range of 0 to 7 wt .-%, preferably 0.1 to 5 wt .-%, particularly preferably 0.5 to 4
  • the present invention further relates to a process for producing a multi-layered lignocellulosic material containing at least three layers, wherein either only the middle layer or at least a portion of the middle layers contain a lignocellulosic material as defined above or except the middle layer or at least a portion of the middle one Layers at least one further layer contains a lignocellulose-containing substance as defined above, wherein the components for the individual layers are stacked one above the other and pressed under elevated temperature and elevated pressure.
  • the average density of the multilayer, preferably of the three-layered, lignocellulose material according to the invention, preferably wood material according to the invention is generally not critical.
  • higher density multilayered, preferably inventive three-layered, lignocellulosic materials according to the invention usually have a mean density in the range of at least 600 to 900 kg / m 3 , preferably 600 to 850 kg / m 3 , particularly preferably 600 to 800 kg / m 3 .
  • low-density multilayer, preferably inventive, three-layer, lignocellulosic materials according to the invention usually have a mean density in the range of 200 to 600 kg / m 3 , preferably 300 to 600 kg / m 3 , particularly preferably 350 to 500 kg / m 3 .
  • Preferred parameter ranges and preferred embodiments with regard to the average density of the lignocellulose-containing, preferably wood-containing substance and with regard to the components and their preparation processes A), B), C) and D) and the combination of the features correspond to those described above.
  • Middle layers in the sense of the invention are all layers that are not the outer layers.
  • the outer layers (usually called “cover layers”) contain no expanded plastic particles B).
  • the multilayer lignocellulosic material according to the invention preferably multilayer wood material, preferably contains three lignocellulosic layers, preferably wood pulp layers, wherein the outer cover layers are generally thinner overall than the inner layer (s).
  • the binder used for the outer layers is usually an amino-plastharz, such as urea-formaldehyde resin (UF), melamine-formaldehyde resin (MF), melamine-urea-formaldehyde resin (MUF) or the inventive binder C).
  • 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 to -NH 2 group ratio is in the range of 0.3: 1 to 3: 1 ,
  • the thickness of the multilayered lignocellulosic material according to the invention preferably multilayer wood material 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 12 to 40 mm.
  • component B is foamed from expandable plastic particles and coated with coating agent.
  • the propellant-containing expandable plastic granules were prefoamed into foam beads in a commercially available EPS pressure prefoamer (Erlenbach) with a volume of 180 liters (about 50 cm in diameter and about 100 cm in height) (filling quantity Kaurit-Light-200). Granules 2000 g).
  • the coating agents were injected in 27% by weight solution (dissolved in water) into the pressure prefoamer.
  • the coated component B) thus obtained can now be used further directly or after storage.
  • 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 coarser material for the cover layers.
  • the cover shavings are separated from the middle layer shavings with component C), hardened ter, these hardeners are preferably added shortly before the use of the component C, and optionally glues component D, or mixed. This mixture is referred to below as a cover layer material.
  • the middle-layer chips are separated from the outer layer chips with the coated component B), component C, hardener, these hardeners are preferably added shortly before the use of the component C, and optionally glues component D, or mixed. This mixture is then referred to as middle layer material. Then the chips are scattered.
  • cover layer material is scattered on the forming belt, then the middle layer material - containing the coated components B), C) and optionally D) - and finally again cover layer material.
  • the cover layer material is divided so that both cover layers contain approximately the same amount of 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 to 230 ° C to the desired thickness. The pressing time is normally 3 to 15 seconds per mm plate thickness. This gives a three-layer chipboard.
  • the mechanical strength can be determined by measuring the transverse tensile strength according to EN 319.
  • the coating of component B) has the effect that the migration of the individual plastic particles to the surface is reduced, suppressed or prevented and the total amount of binder in the lignocellulose material according to the invention is reduced.
  • Lignocellulosic materials in particular multilayer wood materials, are a cost-effective and resource-saving alternative to solid wood and are of great importance and are used for the production of objects of all kinds and in the construction sector, in particular for the production of furniture and furniture parts (in furniture), packaging materials, laminate flooring and as building materials, in building construction or in interior work or in motor vehicles.
  • the expandable or expanded plastic particles are suitable for producing lignocellulose-containing shaped bodies (use). Examples
  • a 67% strength by weight aqueous solution of Kaurit® size 347 liquid from BASF SE (Technical Data Sheet, M 6167 d, February 2008, BASF SE) in the molar ratio of formaldehyde to urea of 1.09: 1 was admixed with 0 , 4 wt .-% of a 52 wt .-% aqueous ammonium nitrate solution and 14 wt .-% water.
  • a chip cake of size 500 x 500 mm and height 150 mm was sprinkled from the glued wood chips. Then one of the plastic films listed in Table 1 is placed on the chip cake and further chips are sprinkled on the film until the total height of the chip cake is 200 mm.
  • the glued wood chips with the inner plastic film are pressed in a hot press at 210 ° C and 180 seconds to a 19 mm thick chipboard, wherein the pressing pressure after 60 seconds from 40 initially to 20 bar and after another 60 seconds to 10 bar is reduced. After cooling to room temperature and storage for at least 24 hours, the wood chipboards thus obtained are examined.
  • the transverse tensile strength was determined according to the inventive games (Nos. 1 and 2) and comparative examples (A, B, C, D, E, F and G) according to EN 312.
  • Aluminum foil is used during the pressing process
  • Foil F1 consisted of a total of seven layers having the following composition (all the following data in% by weight, total content of polyisobutylene about 0.5 to 1 wt .-%):
  • Lupolen® 2420F is a LDPE (Low Density Polyethylene) from LyondellBasell
  • - ARX® 901 is a UV stabilizer for plastics from Argus
  • the film was produced on a 7-layer blown film line from Collin.
  • the extruders BF had an inner diameter of 30mm and an inner length of 750mm.
  • Extruder A had an inner diameter of 45mm and an inner length of 1 125mm.
  • the tuyere with Spiral jacket had a diameter of 180mm.
  • the cooling distance after the nozzle before flattening was 8.5m.
  • the extruders had a melt temperature of 215-232 ° C.
  • the take-off speed was 15.5 m / min.
  • Extruder A had about 5 kg throughput per hour, extruder C about 3 kg / h and all other extruders about 3.5 kg / h.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
  • Polyurethanes Or Polyureas (AREA)
  • Laminated Bodies (AREA)

Abstract

L'invention concerne des matériaux lignocellulosiques multicouches, au moins une couche étant une couche barrière contre l'humidité et au moins une couche barrière contre l'humidité se situant au-dessous de la surface du matériau lignocellulosique. Les couches de matériau lignocellulosique contiennent : A) 30 à 98 % en poids de matières contenant une ou plusieurs lignocelluloses ; B) 0 à 25 % en poids de particules de matière plastique expansée dont la densité apparente se situe dans la plage de 10 à 150 kg/m3 ; C) 1 à 50 % en poids d'un liant, choisi dans le groupe constitué par la résine aminoplaste, la résine phénol-formaldéhyde, l'isocyanate organique comprenant au moins deux groupes isocyanates ou leurs mélanges, comprenant le cas échéant un durcisseur ; et D) 0 à 68 % en poids d'additifs, par le fait que la barrière à l'humidité contient 0,01 à 100 % en poids de polyisobutyles, 0 à 99,99 % en poids d'autres polymères et 0 à 20 % en poids d'additifs. L'invention concerne également un procédé de production desdits matériaux lignocellulosiques multicouches et l'utilisation de ces derniers.
EP15712358.9A 2014-05-19 2015-03-25 Matériaux lignocellulosiques multicouches à l'intérieur desquels se situe une barrière contre l'humidité Withdrawn EP3145710A1 (fr)

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EP14168775.6A EP2946919A1 (fr) 2014-05-19 2014-05-19 Lignocellulose multicouches équipée d'une barrière pare-vapeur intérieure
PCT/EP2015/056395 WO2015176853A1 (fr) 2014-05-19 2015-03-25 Matériaux lignocellulosiques multicouches à l'intérieur desquels se situe une barrière contre l'humidité

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DE3802797A1 (de) * 1988-01-30 1989-08-10 Guenther Dr Schwarz Verfahren und vorrichtung zum herstellen schnellhaertender ueberzuege auf traegerkoerpern
US5112875A (en) 1990-11-26 1992-05-12 Basf Corporation Polystyrene having high degree of expandability, and formulation having a highly-expandable polymer therein
US5439749A (en) 1994-08-18 1995-08-08 Andersen Corporation Composite wood structure
DE19908183A1 (de) 1999-02-25 2000-08-31 Basf Ag Wässrige Polymerdispersionen
DE102004006385A1 (de) 2004-02-09 2005-09-01 Kronotec Ag Holzwerkstoffplatte sowie ein Verfahren zum Herstellen einer Holzwerkstoffplatte
DE102005061922A1 (de) 2005-12-23 2007-07-05 Institut für Holztechnologie Dresden gGmbH Verfahren und Anlage zur Herstellung von Plattenwerkstoffen
WO2010018142A1 (fr) * 2008-08-15 2010-02-18 Basf Se Matériaux légers à base de bois, présentant de bonnes propriétés mécaniques
PL2867021T3 (pl) * 2012-07-02 2016-12-30 Wielowarstwowe lekkie tworzywa drzewne z materiałów zawierających lignocelulozę mających rdzeń i dwie warstwy wierzchnie, zawierających w rdzeniu poddany obróbce materiał celulozowy, poddane obróbce włókna naturalne, włókna syntetyczne lub ich mieszaniny

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