EP1606089B1 - Methode de reduction des emissions et methode de fabrication d'un produit de bois - Google Patents

Methode de reduction des emissions et methode de fabrication d'un produit de bois Download PDF

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Publication number
EP1606089B1
EP1606089B1 EP04721051A EP04721051A EP1606089B1 EP 1606089 B1 EP1606089 B1 EP 1606089B1 EP 04721051 A EP04721051 A EP 04721051A EP 04721051 A EP04721051 A EP 04721051A EP 1606089 B1 EP1606089 B1 EP 1606089B1
Authority
EP
European Patent Office
Prior art keywords
treating
substances
gaseous
wooden
substance
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.)
Revoked
Application number
EP04721051A
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German (de)
English (en)
Other versions
EP1606089A2 (fr
Inventor
Benyahia Nasli-Bakir
Hans Ekblom
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.)
Akzo Nobel Coatings International BV
Original Assignee
Akzo Nobel Coatings International BV
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Publication date
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Application filed by Akzo Nobel Coatings International BV filed Critical Akzo Nobel Coatings International BV
Priority to EP04721051A priority Critical patent/EP1606089B1/fr
Publication of EP1606089A2 publication Critical patent/EP1606089A2/fr
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Classifications

    • A—HUMAN NECESSITIES
    • A62—LIFE-SAVING; FIRE-FIGHTING
    • A62D—CHEMICAL MEANS FOR EXTINGUISHING FIRES OR FOR COMBATING OR PROTECTING AGAINST HARMFUL CHEMICAL AGENTS; CHEMICAL MATERIALS FOR USE IN BREATHING APPARATUS
    • A62D3/00—Processes for making harmful chemical substances harmless or less harmful, by effecting a chemical change in the substances
    • A62D3/30—Processes for making harmful chemical substances harmless or less harmful, by effecting a chemical change in the substances by reacting with chemical agents
    • A62D3/33—Processes for making harmful chemical substances harmless or less harmful, by effecting a chemical change in the substances by reacting with chemical agents by chemical fixing the harmful substance, e.g. by chelation or complexation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N1/00—Pretreatment of moulding material
    • B27N1/003—Pretreatment of moulding material for reducing formaldehyde gas emission
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N7/00—After-treatment, e.g. reducing swelling or shrinkage, surfacing; Protecting the edges of boards against access of humidity

Definitions

  • the present invention relates to a method for reducing emissions from a glued wooden product. It also relates to a method for producing a laminated wooden product, a product obtainable by the method, and a low-emitting laminated wooden product.
  • Solid wood may itself emit substances such as terpenes and aldehydes, usually referred to as volatile organic compounds (VOC), and some adhesive systems used for joining wood materials may emit various substances from the glue lines.
  • VOC volatile organic compounds
  • Such emissions may be, for example, formaldehyde from phenolic- or amino resin based adhesive systems, and isocyanates from emulsion polymer isocyanate (EPI) adhesive systems.
  • a curable adhesive system is applied onto wooden lamellae, which are subsequently arranged into an assembly of lamellae.
  • the assembly is then pressed, usually under heat or high-frequency electromagnetic fields, and the adhesive system is cured.
  • a planing step is usually performed on the surfaces transversely to the plane of adhesive application in order to remove excess adhesive and any unevenness resulting from assembling the individual lamellae.
  • the final laminated beam will have a plurality of glue lines exposed to open air, as well as newly planed wooden surfaces. It has been found that the exposed glue lines may emit a significant amount of gaseous substances, such as formaldehyde. Also, the newly planed wooden surfaces may emit gaseous substances, such as terpenes and aldehydes.
  • WO 02/072323 A1 and WO 02/072324 A1 disclose methods of reducing emission of formaldehyde from layered products but do not deal with emissions from an exposed glue line.
  • wooden materials is herein meant any type of materials originating from wood. This includes both materials of solid wood and, for example, materials made of fibres, particles, and chips of wood.
  • a method for reducing emissions of one or more gaseous substances from an assembly of at least two pieces of wooden materials which have been glued together comprising planing on at least one of the sides having glue lines exposed, followed by treating the at least one planed sides with one or more treating substances reactive to the one or more gaseous substances.
  • the pieces of wooden material are wooden lamellae.
  • at least one of the gaseous substances is emitted from an exposed glue line. It is also suitable that at least one of the gaseous substances is emitted from a solid wood surface.
  • a method for producing a wooden product comprising the steps of: applying an adhesive system onto one or more wooden lamellas, assembling two or more wooden lamellas into an assembly, pressing the assembly, planing at least one of the sides of the assembly having glue lines exposed, and, treating the one or more planed sides by application of one or more treating substances reactive to one or more gaseous substances emitted from the at least one planed side.
  • the wooden product is suitably a laminated wooden product.
  • Reactive to one or more gaseous substances refers to a capability of reducing the total emissions thereof with at least 5%, preferably at least 10%, even more preferably at least 25%, most preferably at least 50%.
  • Suitable adhesive systems to be used in the method of the invention are curable adhesive systems such as amino resin based adhesive systems, phenolic resin based adhesive systems and isocyanate based adhesive systems.
  • amino resin based adhesive systems are melamine-formaldehyde-, melamine-urea-formaldehyde-, and urea-formaldehyde-based adhesive systems.
  • phenolic resin based adhesive systems are phenol-formaldehyde-, phenol-resorcinol-formaldehyde and resorcinol-formaldehyde based adhesive systems.
  • isocyanate based adhesive systems are polyurethane based adhesive systems and emulsion polymer isocyante (EPI) based adhesive systems.
  • EPI emulsion polymer isocyante
  • the adhesive is cured during, or in connection to, the pressing step.
  • non-curable adhesive systems such as adhesive systems based on vinylester polymers can be used.
  • vinylester based adhesive systems are polyvinylacetate- ethylene-vinylacetate- and polyvinylpropionate based adhesive systems.
  • the application of adhesive onto lamellae and assembling of all lamellae are suitably performed in separate steps.
  • each lamella is applied with the adhesive system at different points of time, the assembly is gradually built-up with the lamellae most recent having been applied with the adhesive system.
  • planing is suitably performed on two sides of the assembly having glue lines exposed.
  • the one or more treating substances are reactive to one or more gaseous substances emitted from the glue line. Also suitable, the one or more treating substances are reactive to one or more gaseous substances emitted from solid wood.
  • the gaseous substances according to the invention may be of different types.
  • One group of substances which may be emitted from a glue line is aldehydes, such as acetaldehyde, formaldehyde, glutaraldehyde, propionaldehyde, n-butyraldehyde, isobutyraldehyde, hexanal and furfural.
  • Another group of substances which may be emitted from a glue line is isocyanates, such as methyl isocyanate, hexamethylene-1,6-diisocyanate, 4,4-methylenediphenyl isocyanate, toluene 2,4-diisocyanate, and isophorone diisocyanate.
  • Gaseous substances which may be emitted from solid wood are, for example, terpenes such as the monoterpenes ⁇ - and ⁇ -pinene, 3-carene, and limonene, as well as aldehydes such as acetaldehyde, propanal, butanal, pentanal, hexanal and benzaldehyde.
  • terpenes such as the monoterpenes ⁇ - and ⁇ -pinene, 3-carene, and limonene
  • aldehydes such as acetaldehyde, propanal, butanal, pentanal, hexanal and benzaldehyde.
  • one gaseous substance is suitably an aldehyde, preferably formaldehyde.
  • one or more treating substances are suitably reactive to an aldehyde, preferably formaldehyde.
  • the one or more treating substances contain an amino or amide group, of which examples of substances are guanamines, urea, thiourea, biuret, semicarbazides, succinamide, hexamethylendiamine, ethanol amine, ethylene amines, proteins, peptides, hydrazides and ammonium salts such as ammonium carbonate, mono- and diammonium phosphate, ammonium sulphide, and ammonium sulphite.
  • Other sulphites, such as potassium or sodium sulphite can also be used.
  • proteins like glutenin, casein, and zein, or protein-containing materials such as flour, whey and protein-containing starch.
  • Hydroxy group containing substances may also be used as treating substances such as alcohols and polyvinylalcohol. Also carbohydrates, such as mono- di- and polysaccharides can be used. Preferably, amino- or amido group containing substances are used. Most preferably, the at least one treating substance is urea or a urea derivative.
  • one gaseous substance is suitably an isocyanate.
  • one or more treating substances are suitably reactive to an isocyanate.
  • Suitable treating substances include substances containing an amino or amide group, of which examples of substances are guanamines, urea, thiourea, biuret, semicarbazides, succinamide, hexamethylendiamine, ethanol amine, ethylene amines, proteins, peptides, hydrazides and ammonium salts such as ammonium carbonate, ammonium sulphide, and ammonium sulphite.
  • Hydroxy group containing substances may also be used as treating substances such as alcohols and polyvinylalcohol.
  • carbohydrates, such as mono- di- and polysaccharides can be used.
  • a further suitable treating substance is water.
  • the at least one treating substance is an amino- or amido group containing substance.
  • the gaseous substances suitably belong to the group of terpenes.
  • the one or more treating substances are suitably reactive to terpenes.
  • the treating substances belong to the group of unsaturated aldehydes, such as alkenals and alkdienals, or hydroxy group containing substances such as alcohols and polyvinylalcohol.
  • the at least one treating substance is an unsaturated aldehyde such as pentenal, hexenal, or octenal.
  • a treating substance may be used in the methods of the invention as a single component.
  • the one or more treating substances are suitably components of a treating composition.
  • the treating composition according to the methods of the invention is suitably fluid and suitably comprises a solvent for the one or more treating substances.
  • Suitable solvents are water, alcohols such as methanol, ethanol and glycols, and esters such as butyldiglycol acetate.
  • water is used as solvent.
  • Mixtures of solvents may also be used.
  • the choice of solvent may in some cases affect the swelling of fibres at a wooden surface. Preferred solvents in these cases include alcohols, glycols, or glycolic acids.
  • the treating composition suitably comprises from about 0.01 to about 99 weight %, preferably from about 1 to about 80 weight %, most preferably from about 10 to about 60 weight % of the one or more treating substances.
  • the treating composition suitably comprises an agent for improving the film forming properties of the composition when applied onto a surface, preferably a wooden surface.
  • the treating composition comprises a polymer as film forming improving agent, suitably in the form of a polymer dispersion.
  • the polymer dispersion is preferably a dispersion of a polyvinylester, such as polyvinylacetate or its derivatives such as polyvinylacohol, or a polyacrylate dispersion, most preferably a polyvinylalcohol dispersion.
  • the dry content of the film forming improving agent in the treating composition is suitably from about 0.01 to about 50 weight %, preferably from about 0.02 to about 10 weight %, most preferably from about 0.03 to about 2 weight %.
  • the treating composition comprises from about 0.01 to about 100 weight %, preferably from about 1 to about 80 weight %, most preferably from about 10 to about 60 weight %, of urea or a urea derivative.
  • the treating composition comprises from about 0.01 to about 100 weight %, preferably from about 1 to about 80 weight %, most preferably from about 10 to about 60 weight %, of a reaction product of an alcohol and ammonia.
  • the treating composition comprises from about 0.01 to about 100 weight %, preferably from about 1 to about 80 weight %, most preferably from about 10 to about 60 weight %, of an unsaturated aldehyde.
  • Suitable methods for treating with the one or more treating substances are, for example spraying, roller coating, curtain coating, and coating with an impregnated pad or wetted cloth.
  • the treating with the treating substances is made by spraying or by roller coating.
  • both sides are suitably treated simultaneously.
  • the upper side is treated by spraying and the under side is treated by roller coating.
  • the one or more treating substances in the form of strands, which to an extent of more than 50% covers the glue lines, preferably to an extent of more than 80%, most preferably to an extent of substantially 100%.
  • the one or more treating substances are suitably applied in an amount to achieve the desired effect, and the amount depends on which treating substance is used. If a treating composition is used, the treating composition is suitably applied in an amount of from about 0.1 to about 100 g/m 2 , preferably from about 1 to about 50 g/m 2 , most preferably from about 5 to about 30 g/m 2 .
  • drying step can be added after the one or more treating substances have been applied.
  • Suitable drying means are, for example, infra-red radiation, blowing with warm air, and microwave heating.
  • the treating with the one or more treating substances is suitably performed shortly after the planing, but can also be made at a later stage after the planing, suitably up to about 30 days after the planing, preferably from about 0.1 seconds to about 5 days after the planing, more preferably from about 0.5 seconds to about 1 hour after the planing, most preferably from about 0.5 seconds to about 60 seconds after the planing.
  • a laminated beam is manufactured by applying one of a melamine-formaldehyde-, melamine-urea-formaldehyde-, or phenol-resorcinol-formaldehyde- based adhesive system onto a plurality of wooden lamellae.
  • the lamellae are joined into an assembly and pressed at elevated temperature.
  • the resulting beam is subsequently planed on both sides having exposed glue lines in the longitudinal direction, which sides are then treated by application of a fluid treating composition as described above.
  • the laminated wooden product according to the invention is suitably a laminated beam, in which is also included other laminated structural materials such as laminated veneer lumber.
  • the invention also concerns a product obtainable by the method of the invention as described above.
  • the laminated wooden product obtainable by the method of the invention suitably has a formaldehyde emission, according to JAS, standard for structural glued timber MAFF, Supplement No 992, of less than about 0.5 mg/l, preferably less than about 0.3 mg/l.
  • the invention further concerns a laminated wooden product comprising at least two lamellae, which have been joined with an adhesive system based on a formaldehyde based resin.
  • This laminated wooden product has a formaldehyde emission, according to JAS, standard for structural glued timber MAFF, Supplement No 992, of less than about 0.5 mg/l, preferably less than about 0.3 mg/l.
  • the invention concerns a laminated wooden product comprising at least two lamellae joined with a glue line
  • the laminated wooden product comprises a substance, other than water, reactive to aldehydes, isocyanates or terpenes in close proximity of the surface of the side of the product having at least one exposed glue line.
  • Each laminated wooden product according to the invention mentioned above is suitably a laminated beam, in which is also included other laminated structural materials such as laminated veneer lumber.
  • a melamine-urea-formaldehyde (MUF) resin and a conventional acidic hardener was tested as well as a low-formaldehyde-emitting adhesive system comprising a melamine-urea-formaldehyde (MUF) resin, a phenol-resorcinol-formaldehyde (PRF) resin and an acid.
  • a melamine-urea-formaldehyde (MUF) resin and a conventional acidic hardener was tested as well as a low-formaldehyde-emitting adhesive system comprising a melamine-urea-formaldehyde (MUF) resin, a phenol-resorcinol-formaldehyde (PRF) resin and an acid.
  • the present invention gives a significant reduction of emission of formaldehyde both for a conventional MUF resin based adhesive system and for a low-emitting MUF/PRF resin based adhesive system.
  • the emission of formaldehyde from glued structures was tested according to an internal test method which is a modified JAS MAFF992 using smaller test pieces.
  • Five lamellae (5 x 150 x 150 mm) of spruce were assembled and glued together with a mixture resin and hardener spread in an amount of 380 g/m 2 . After pressing and conditioning (20°C at 65 % relative humidity), pieces of 75x25x10 mm were cut out. The butt-ends (opposite the fibre direction) were sealed with aluminium foil leaving two surfaces of 75x25 mm having exposed glue lines.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Chemical & Material Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
  • Laminated Bodies (AREA)
  • Veneer Processing And Manufacture Of Plywood (AREA)
  • Adhesives Or Adhesive Processes (AREA)

Claims (16)

  1. Procédé de réduction d'émissions d'une ou plusieurs substances gazeuses d'un ensemble d'au moins deux pièces de matériaux en bois qui ont été collées ensemble, comprenant le rabotage sur au moins un des côtés ayant des lignes de collage exposées, suivi du traitement du au moins un côté raboté avec une ou plusieurs substances de traitement réactives aux une ou plusieurs substances gazeuses.
  2. Procédé selon la revendication 1, dans lequel au moins une des substances gazeuses est émise depuis une ligne de collage exposée.
  3. Procédé selon la revendication 1, dans lequel au moins une des substances gazeuses est émise depuis une surface en bois massif.
  4. Procédé de production d'un produit en bois lamellé comprenant les étapes de :
    (a) application d'un système adhésif sur une ou plusieurs lamelles en bois,
    (b) assemblage de deux lamelles en bois ou plus en un ensemble,
    (c) pressage de l'ensemble,
    (d) rabotage d'au moins un des côtés de l'ensemble ayant des lignes de collage exposées, et
    (e) traitement du ou des côtés rabotés par application d'une ou plusieurs substances de traitement réactives vis-à-vis d'une ou plusieurs substances gazeuses émises depuis l'au moins un côté raboté.
  5. Procédé selon l'une quelconque des revendications 1 à 4, dans lequel une substance gazeuse est un aldéhyde.
  6. Procédé selon l'une quelconque des revendications 1 à 5, dans lequel une substance gazeuse est le formaldéhyde.
  7. Procédé selon l'une quelconque des revendications 1 à 4, dans lequel une substance gazeuse est un isocyanate.
  8. Procédé selon l'une quelconque des revendications 5 à 7, dans lequel une substance de traitement est l'urée ou un dérivé d'urée.
  9. Procédé selon la revendication 7, dans lequel une substance de traitement est un produit de réaction d'un alcool et de l'ammoniaque.
  10. Procédé selon l'une quelconque des revendications 1 à 4, dans lequel une substance gazeuse est un terpène.
  11. Procédé selon la revendication 10, dans lequel une substance de traitement est un aldéhyde insaturé ou un alcool.
  12. Procédé selon l'une quelconque des revendications 1 à 11, dans lequel la ou les substances de traitement sont des composants d'une composition de traitement.
  13. Procédé selon la revendication 12, dans lequel la composition de traitement comprend d'environ 1 à environ 80 % en poids de la ou plusieurs substances de traitement.
  14. Procédé selon l'une quelconque des revendications 12 à 13, dans lequel la composition de traitement comprend d'environ 0,02 à environ 10 % en poids d'un polymère.
  15. Procédé selon l'une quelconque des revendications 12 à 14, dans lequel la composition de traitement comprend une dispersion de poly(alcool vinylique).
  16. Procédé selon l'une quelconque des revendications 4 à 15, dans lequel le produit en bois lamellé est une poutre lamellée.
EP04721051A 2003-03-25 2004-03-16 Methode de reduction des emissions et methode de fabrication d'un produit de bois Revoked EP1606089B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP04721051A EP1606089B1 (fr) 2003-03-25 2004-03-16 Methode de reduction des emissions et methode de fabrication d'un produit de bois

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP03445039 2003-03-25
EP03445039 2003-03-25
EP04721051A EP1606089B1 (fr) 2003-03-25 2004-03-16 Methode de reduction des emissions et methode de fabrication d'un produit de bois
PCT/SE2004/000375 WO2004085125A2 (fr) 2003-03-25 2004-03-16 Procede de reduction d'emission et procede de production d'article en bois

Publications (2)

Publication Number Publication Date
EP1606089A2 EP1606089A2 (fr) 2005-12-21
EP1606089B1 true EP1606089B1 (fr) 2013-01-02

Family

ID=33041161

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04721051A Revoked EP1606089B1 (fr) 2003-03-25 2004-03-16 Methode de reduction des emissions et methode de fabrication d'un produit de bois

Country Status (6)

Country Link
EP (1) EP1606089B1 (fr)
JP (2) JP4440218B2 (fr)
CL (1) CL2004000627A1 (fr)
MY (1) MY140096A (fr)
TW (1) TWI282303B (fr)
WO (1) WO2004085125A2 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1808278A1 (fr) 2006-01-17 2007-07-18 Basf Aktiengesellschaft Procédé pour la réduction de l'émission de formaldéhyde des matériaux en bois
MY146656A (en) 2006-01-17 2012-09-14 Basf Se Method for the reduction of formaldehyde emissions in wood materials
WO2007083578A1 (fr) * 2006-01-19 2007-07-26 Idemitsu Technofine Co., Ltd. Agent fixant le formaldéhyde, composition désodorisante, solution désodorisante et matériau en bois
JP4814638B2 (ja) * 2006-01-19 2011-11-16 株式会社オーシカ ホルムアルデヒド捕捉剤及びそれを用いる木質材料
DE102007038041A1 (de) 2007-08-10 2009-02-12 Kronotec Ag Verfahren zur Vermeidung der Emission von Aldehyden und flüchtigen organischen Verbindungen aus Holzwerkstoffen
DE102007050935A1 (de) * 2007-10-23 2009-04-30 Kronotec Ag Verfahren zur Verringerung der Emission von Aldehyden und anderen flüchtigen organischen Verbindungen aus Holzwerkstoffen und Zusammensetzungen hierfür
EP2181818A3 (fr) * 2008-10-28 2012-08-22 IHD Institut für Holztechnologie Dresden gGmbH Procédé de fabrication de matières premières en fibres de bois et matières premières en fibres de bois ayant des émissions réduites en VOC volatiles
CN104841257B (zh) * 2015-04-14 2017-04-19 张家港大塚化学有限公司 一种安全甲醛去除溶液及其制备方法

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JP2002322424A (ja) * 2001-04-25 2002-11-08 Takeda Chem Ind Ltd 塗料組成物

Also Published As

Publication number Publication date
JP4981874B2 (ja) 2012-07-25
CL2004000627A1 (es) 2005-06-03
WO2004085125A3 (fr) 2005-02-17
JP2006514587A (ja) 2006-05-11
TWI282303B (en) 2007-06-11
WO2004085125A2 (fr) 2004-10-07
MY140096A (en) 2009-11-30
EP1606089A2 (fr) 2005-12-21
JP4440218B2 (ja) 2010-03-24
TW200422157A (en) 2004-11-01
JP2010076449A (ja) 2010-04-08

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