EP2114644A1 - Procédé de traitement de pièces de bois - Google Patents

Procédé de traitement de pièces de bois

Info

Publication number
EP2114644A1
EP2114644A1 EP08707424A EP08707424A EP2114644A1 EP 2114644 A1 EP2114644 A1 EP 2114644A1 EP 08707424 A EP08707424 A EP 08707424A EP 08707424 A EP08707424 A EP 08707424A EP 2114644 A1 EP2114644 A1 EP 2114644A1
Authority
EP
European Patent Office
Prior art keywords
wood
heat treatment
cyanamide
cyanamide solution
aqueous cyanamide
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.)
Granted
Application number
EP08707424A
Other languages
German (de)
English (en)
Other versions
EP2114644B1 (fr
Inventor
Thomas Günther
Jürgen SANS
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.)
Alzchem Trostberg GmbH
Original Assignee
Alzchem Trostberg GmbH
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 Alzchem Trostberg GmbH filed Critical Alzchem Trostberg GmbH
Publication of EP2114644A1 publication Critical patent/EP2114644A1/fr
Application granted granted Critical
Publication of EP2114644B1 publication Critical patent/EP2114644B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
    • B27K3/02—Processes; Apparatus
    • B27K3/15—Impregnating involving polymerisation including use of polymer-containing impregnating agents
    • B27K3/156—Combined with grafting onto wood fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
    • B27K3/02—Processes; Apparatus
    • B27K3/0278—Processes; Apparatus involving an additional treatment during or after impregnation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K5/00—Treating of wood not provided for in groups B27K1/00, B27K3/00
    • B27K5/0085—Thermal treatments, i.e. involving chemical modification of wood at temperatures well over 100°C
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K2240/00—Purpose of the treatment
    • B27K2240/70—Hydrophobation treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
    • B27K3/00—Impregnating wood, e.g. impregnation pretreatment, for example puncturing; Wood impregnation aids not directly involved in the impregnation process
    • B27K3/02—Processes; Apparatus
    • B27K3/08—Impregnating by pressure, e.g. vacuum impregnation

Definitions

  • the present invention relates to a method for the treatment of wood parts to improve their performance properties such. As hardness, water absorption and weather resistance.
  • the present invention therefore an object of the invention to develop a method for modifying wood parts in the form of wood or wood materials, which does not have the disadvantages of the prior art, but the known method for the thermal treatment of wood with an impregnation in the Improved manner that only small amounts of a toxicologically and ecologically harmless impregnating agent are needed and still obtain advantageous properties.
  • the wood parts in the form of wood or wood-based materials are first subjected to impregnation with cyanamide (step a)) and then to a heat treatment (step b)).
  • This low-priced hardwood and softwoods of moderate widths are treated, which preferably come from sustainable forestry.
  • Examples are the European woods spruce, fir, pine, birch, beech, such. European beech or hornbeam, maple, poplar, alder, linden, Douglas fir, ash and oak, as well as non-European woods with an analogous property profile.
  • the woods are preferably as solid wood (boards, planks, slats) before. But they can also be in the form of veneers or chips for subsequent use for the production of wood-based materials. Alternatively, finished wood materials (plywood, chipboard, wood fiber boards, OSB boards, glued wood) can be treated by the method according to the invention.
  • the said woods or wood-based materials are preferably impregnated by the application of vacuum and / or pressure with a cyanamide-containing solution. Suitable for this purpose are facilities such as are commonly used for the boiler pressure impregnation of woods.
  • the aqueous impregnating solution should preferably contain 1 to 50% by weight of cyanamide, particularly preferably 5 to 25% by weight of cyanamide, in particular 10 to 15% by weight of cyanamide.
  • the pH of the impregnating solution should be in the range 3.0 to 7.0, preferably pH 4.0 to 5.5 or pH 4.5 to 5.0.
  • the impregnating solution may optionally contain further substances, the water-soluble wood preservatives known to the person skilled in the art in the concentration range of 0.01 to 5.0% by weight being preferred. Typical examples of such additives are, for. As fungicides, insecticides or biocides, such as.
  • borates As copper compounds, fluorides, borates, silicates, phenol, 1, 2,4-triazoles, insecticidal phosphoric acid esters or neonicotinoid insecticides. To improve the flame resistance of wood or wood materials phosphates, borates or sulfamates can be added. In addition, pigments and / or dyes and / or ultraviolet light absorbers may be included.
  • the aqueous cyanamide solution further contains surfactants, preferably in an amount of 0.02 to 0.2 wt .-%, in particular 0.05 to 0.015 wt .-%.
  • surfactants preferably in an amount of 0.02 to 0.2 wt .-%, in particular 0.05 to 0.015 wt .-%.
  • the impregnation (step a)) is suitably carried out in a temperature range between 0 and 60 0 C, in particular 20 to 40 0 C.
  • vacuum 0.02 to 0.98 bar
  • pressure (1, 02 to 15 bar )
  • a 1- to 5-fold alternation of pressure and vacuum treatment can take place.
  • Corresponding methods are known to the person skilled in the art.
  • the woods impregnated in this way are optionally subjected to a heat treatment after drying.
  • the optional drying of the impregnated with the aqueous cyanamide wood can be carried out at temperatures of 20 to 150 0 C, preferably at 40 to 130 0 C, wherein the external pressure, if necessary, by applying a vacuum to 0.01 to 1, 0 bar is set.
  • the drying time is several hours, preferably 1 to 24 hours.
  • the drying is initiated by the action of the temperature and pressure conditions provided for the heat treatment, in which case a sliding transition to the heat treatment takes place.
  • the temperature range of the heat treatment is between 130 and 250 ° C., preferably 150 to 220 ° C., in particular 170 to 200 ° C.
  • the duration of the heat treatment is 1 to 36 hours, times between 2 and 12 hours or 4 to 8 hours being preferred .
  • the drying and subsequent heat treatment is preferably carried out in several temperature stages, wherein said temperature is gradually approached.
  • the heat treatment can be carried out without pressure, but possibly also under a pressure of up to 10 bar, for example at 3 to 7 bar, wherein the atmosphere may preferably contain air, nitrogen, water vapor or a mixture thereof.
  • the treated woods have a residual moisture of preferably less than 10%. They can be used as such as construction timbers, such. As for load-bearing or non-structural components of buildings, doors, windows, furniture (especially garden furniture) and wood elements in horticulture. Alternatively, the treated woods (especially in the form of veneers, chips, etc.) can be used for the production of wood-based materials, which in turn can be used for the applications mentioned.
  • the invention treated wood parts are characterized by very good performance properties such. As high hardness, low water absorption and very good weather resistance.
  • test specimens were immersed in cyanamide solution (or water as reference) and completely impregnated by evacuation twice. Then it was dried at 60 0 C in vacuo.
  • the cyanamide uptake into the wood is proportional to the cyanamide concentration (5 or 10% by weight) of the impregnation solutions used.
  • Example 2 Test specimens which had been impregnated with water or with 10% strength by weight cyanamide solution according to Example 1 were thermally post-treated at 160 ° C. (8 hours) or at 200 ° C. (3 hours). The weights of the specimens were used to record the water uptake and cyanamide uptake (see Figure 2).
  • Example 2 woods were for 7 days at 20 0 C in
  • Nitrogen compounds were not cyanamide detectable. Approximately 75% by weight of the extractable nitrogen components consisted of dicyandiamide, 5% by weight of urea, 5% by weight of guanidine and 10% by weight of melamine. • After heat treatment at 200 ° C.,> 90% by weight of the nitrogen incorporated in the form of cyanamide was no longer extractable, ie it was firmly bound to the wood.
  • Wood specimens according to Example 2 were exposed to the weather.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)

Abstract

L'invention concerne un procédé de traitement de pièces de bois, caractérisé a) en ce qu'on imprégne les pièces de bois d'une solution aqueuse de cyanamide, puis b) en ce qu'on soumet les pièces de bois imprégnées, éventuellement après séchage, à un traitement thermique de 130 à 250°C. On a constaté de façon surprenante que l'imprégnation par la cyanamide, même en petites quantités, influençait de façon nettement positive, les propriétés d'application des pièces de bois traitées, par exemple, dureté élevée, faible absorption d'eau et très bonne résistance aux intempéries. En outre, il suffit d'employer de faibles quantités d'un agent d'imprégnation acceptable sur le plan toxicologique et écologique, pour obtenir les propriétés avantageuses précitées.
EP08707424A 2007-02-03 2008-01-30 Procédé de traitement de pièces de bois Not-in-force EP2114644B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007005527A DE102007005527A1 (de) 2007-02-03 2007-02-03 Verfahren zur Behandlung von Holzteilen
PCT/EP2008/000729 WO2008095635A1 (fr) 2007-02-03 2008-01-30 Procédé de traitement de pièces de bois

Publications (2)

Publication Number Publication Date
EP2114644A1 true EP2114644A1 (fr) 2009-11-11
EP2114644B1 EP2114644B1 (fr) 2010-12-29

Family

ID=39327461

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08707424A Not-in-force EP2114644B1 (fr) 2007-02-03 2008-01-30 Procédé de traitement de pièces de bois

Country Status (8)

Country Link
US (1) US8445072B2 (fr)
EP (1) EP2114644B1 (fr)
AT (1) ATE493244T1 (fr)
CA (1) CA2676663A1 (fr)
DE (2) DE102007005527A1 (fr)
ES (1) ES2355095T3 (fr)
HK (1) HK1131765A1 (fr)
WO (1) WO2008095635A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2966372B1 (fr) * 2010-10-26 2013-08-23 Berkem Sa Composition pour le traitement du bois
US10632645B2 (en) 2012-03-29 2020-04-28 Nisus Corporation Method of treating wood
EP2786662B1 (fr) * 2013-04-03 2018-01-03 ADM WILD Europe GmbH & Co. KG Procédé de stockage de substances dans des denrées alimentaires fermes
US10356636B2 (en) * 2017-04-03 2019-07-16 Qualcomm Incorporated Techniques and apparatuses to improve drone-mounted user equipment performance

Family Cites Families (26)

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DE609734C (de) 1928-04-25 1935-02-22 Hellux Akt Ges Horizontalkupplung fuer an Strassenueberspannungsseilen haengende elektrische Leuchten
NL43300C (fr) 1935-05-02
US2386471A (en) * 1942-02-27 1945-10-09 Albi Chemical Corp Fire retarding impregnating composition for wood
GB582853A (en) * 1944-04-21 1946-11-29 Emil Hene Improvements in or relating to the manufacture of synthetic resins
GB600961A (en) 1944-09-20 1948-04-23 Du Pont Improvements in or relating to the impregnation of wood with urea-formaldehyde resins
GB657599A (en) * 1946-05-22 1951-09-19 Albi Chemical Corp Method of improving the fire-and heat-resistance of materials and compositions for use therein
GB634690A (en) * 1947-08-22 1950-03-22 Courtaulds Ltd Improvements in and relating to the treatment of textile yarns and fabrics
DE837925C (de) * 1949-02-16 1952-05-02 Holzveredelung M B H Ges Verfahren zum Veredeln von Holz und daraus hergestellten Gegenstaenden
US3051698A (en) 1959-06-22 1962-08-28 Hubinger Co Cellulose products and process for making same
DE1172798B (de) 1962-02-10 1964-06-25 Graubremse Gmbh Wasser- und OElabscheider fuer druckluftgesteuerte Anlagen
GB1110116A (en) * 1964-01-21 1968-04-18 Courtaulds Ltd Fireproofing of cellulosic material
US3380799A (en) 1965-02-26 1968-04-30 Hubinger Co Anionic agent aftertreatment of cyanamide-modified cellulose
GB1100842A (en) * 1965-03-23 1968-01-24 American Cyanamid Co Nitrogenation of natural products
DE1619047B2 (de) 1967-05-27 1976-07-22 August Krempel Söhne, 7000 Stuttgart Verfahren zur veredelung von cellulosehaltigen materialien
GB1317468A (en) * 1969-09-30 1973-05-16 Cotton Producers Inst Process for rendering cellulosic textile material flame retardant
JPS4823399B1 (fr) * 1970-02-13 1973-07-13
GB8702055D0 (en) 1987-01-30 1987-03-04 Albright & Wilson Wood treatment process
WO1991000327A1 (fr) * 1989-06-28 1991-01-10 Oberley William J Ignifuges et produits les incorporant
ATE198661T1 (de) 1993-05-12 2001-01-15 Valtion Teknillinen Verfahren zur verbesserung des widerstandes von zellulosehaltigen produkten gegen schimmel und fäulnis
DE4409039A1 (de) * 1993-12-21 1995-06-22 Bayer Ag Antifouling-Mittel
EP0759137B1 (fr) 1994-05-11 1998-02-04 Valtion Teknillinen Tutkimuskeskus Procede de traitement du bois a des temperatures elevees
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WO2006117159A1 (fr) 2005-05-02 2006-11-09 Basf Aktiengesellschaft Compositions aqueuses durcissables pour l'impregnation de materiaux lignocellulosiques

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Also Published As

Publication number Publication date
US8445072B2 (en) 2013-05-21
CA2676663A1 (fr) 2008-08-14
ES2355095T3 (es) 2011-03-22
DE102007005527A1 (de) 2008-08-07
EP2114644B1 (fr) 2010-12-29
US20100003411A1 (en) 2010-01-07
DE502008002132D1 (de) 2011-02-10
WO2008095635A1 (fr) 2008-08-14
ATE493244T1 (de) 2011-01-15
HK1131765A1 (en) 2010-02-05

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