WO2005009700A1 - Treatment of thermally modified wood - Google Patents
Treatment of thermally modified wood Download PDFInfo
- Publication number
- WO2005009700A1 WO2005009700A1 PCT/FI2004/000462 FI2004000462W WO2005009700A1 WO 2005009700 A1 WO2005009700 A1 WO 2005009700A1 FI 2004000462 W FI2004000462 W FI 2004000462W WO 2005009700 A1 WO2005009700 A1 WO 2005009700A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- wood
- sizing agent
- thermally modified
- asa
- treatment
- Prior art date
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
- B27K5/00—Treating of wood not provided for in groups B27K1/00, B27K3/00
- B27K5/001—Heating
-
- 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
- B27K3/34—Organic impregnating agents
- B27K3/36—Aliphatic compounds
-
- 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
- B27K5/00—Treating of wood not provided for in groups B27K1/00, B27K3/00
- B27K5/04—Combined bleaching or impregnating and drying of wood
Definitions
- the invention relates to a method for treating thermally modified wood, the product obtained with the method and the use of processing agents in conjunction with the method.
- Thermal modification of wood means controlled thermal treatment of timber at a temperature above 100 °C so that the treatment improves the dimensional stability of the wood and reduces its equilibrium moisture content and moisture life.
- Other beneficial effects of thermal modification comprise increased decay resistance and reduced pitch secretion.
- thermal modification results in darkened wood and impaired bending and splitting resistance. Owing to its properties, thermally modified wood is applicable especially to constructions and furniture exposed to contact with outdoor air.
- Thermal wood modifying techniques have been described in WO 95/31680, which focuses on control of the temperature difference between the outer surface and the interior of the wood during the temperature increase so as to prevent cracks in the wood.
- the temperature difference is in the range 10-30 °C and this range is maintained roughly constant during heating.
- a corresponding controlled temperature difference in the range 10-30. °C between the wood interior and its outer surface can also be maintained during cooling of the wood, during which, unlike the heating process, the higher temperature prevails within the wood.
- WO 94/27102 discloses an improved method for producing thermally modified wood, in which the wood treatment temperature is above 150 °C, the treatment being performed with the aid of steam. A weight loss of at least 3% of the wood occurs in the course of the treatment.
- WO 01/53812 further describes a procedure for recognizing the thermal modification in wood by measuring the number of free radicals in the wood and by comparing this number with that of free radicals in corresponding untreated wood.
- the reference sets forth as a criterion for thermal modification that the number of free radicals in the wood should be at least 1.5-fold, preferably at least double compared to untreated wood.
- the publications mentioned above, WO 95/31680, WO 94/27102 and WO 01/53812 are hereby incorporated by reference in the present patent description.
- thermal wood modification or thermally modified wood implies that the wood meets the criteria of thermal wood modification or of thermally modified wood defined in at least one of the three publications cited above.
- thermally modified wood in moist outdoor air, it has now been found that such wood, when brought into direct contact with water or moist soil, absorbs water in abundance. Although thermal modification as such enhances the decay resistance of wood, especially long-term waterlogging still has a detrimental effect on the resistance of the wood. In addition, soaked wood material gets a markedly increased weight.
- the object of the present invention is thus to provide a solution in order to prevent waterlogging of thermally modified wood.
- the method of the invention comprises water-repellency treatment of thermally modified wood by means of a hydrophobic sizing agent reactive to cellulose.
- the treatment is preferably performed with a solution containing the hydrophobic sizing agent, followed by solvent evaporation by means of drying.
- the entire wood material can be impregnated with the solution containing the sizing agent in order to achieve a constant size concentration.
- the wood can be surface-treated by painting or by immerging it rapidly into an immersion basin, the surfaces of the piece of wood being treated throughout, while the size penetrates into the surface layers alone.
- Sizing agents suitable for increasing the hydrophobicity of wood in accordance with the invention include sizing agents reactive with cellulose, the sizing being performed in the neutral or alkaline pH range.
- Such sizing agents comprise alkyl ketene dimers (AKD) and alkenyl succinic acid anhydrides (ASA) known in paper and board sizing, among other applications.
- the paper and board industry uses these sizes in the form of water emulsions, whereas they are most expedient in impregnating thermally modified wood of the invention when dissolved into an organic solvent, such as acetone.
- the size solution is preferably diluted, with the size concentration in the solution being e.g. 0.01-5% by weight, preferably 0.05-0.2% by weight.
- the invention also allows for the use of a 100% AKD, ASA or similar size as such without any solvent, in the form of a concentrated solution, dispersion or emulsion, the medium of the dispersion or emulsion of the invention being e.g. water, and the proportion of sizing agent equalling the size concentrations in the solution mentioned above.
- AKD and ASA can further be jointly used when intermixed.
- the length of the alkyl chain contained in the alkyl ketene dimers may vary.
- Commercial AKD sizes usually comprise a straight C ⁇ 6 -C 22 alkyl chain.
- AKD sizes comprising a branched or unsaturated carbon chain are also usable in the invention.
- AKD size preparations are available both in a solid and a liquid form.
- the length of the alkenyl chain in alkenyl succinic acid anhydrides may vary.
- Commercial ASA sizes usually comprise a C ⁇ 6 -C 22 alkenyl chain.
- the wood can be further processed by heating, e.g. by exposing it to a temperature in the range 100 - 140 °C for 15-60 minutes.
- the required heating depends on the sizing agent selected; preliminary tests indicate that such after-heating is almost insignificant in AKD sizing, whereas it improves the hydrophobicity obtained with ASA crucially.
- the thermally modified wood of the invention treated as above is characterised in having been impregnated with a hydrophobic sizing agent reactive with cellulose, which makes the wood more water-repellent.
- the size has impregnated at least the surface layers of the piece of wood, so that the surfaces of the piece are protected by the size on all sides. The size may be evenly distributed throughout the wood, with the size concentration in the treated wood being approximately constant.
- the invention further comprises the use of a hydrophobic size, such as AKD or ASA, in water-repellency treatment of thermally modified wood.
- a hydrophobic size such as AKD or ASA
- AKD size containing a C 16 /C 18 alkyl chain was dissolved in acetone to a solubility of 0.1% by weight and thermal wood marketed under the name Thermowood was thoroughly impregnated with this solution.
- the wood was dried by evaporating the acetone solvent and the dried AKD treated wood was heated to 130 °C over periods of 15, 30 and 60 min., respectively.
- the water repellence of the wood was tested by a drop test, in which the contact angle formed by the water droplet placed on the wood and the wood itself was measured after contact periods of 1, 5 and 10 s., respectively.
- the bar chart in enclosed figure 1 shows the results of five samples, a reference sample (ref.), i.e.
- thermal wood not treated with AKD AKD treated thermal wood, which had been dried but not subjected to a heating process
- AKD treated thermal wood which had been dried and then heated to 130 °C over periods of 15, 30 or 60 minutes.
- the results show the hydrophilicity of wood not treated with AKD, appearing as a low contact angle, which further decreases rapidly as the contact is prolonged.
- Thermal wood treated with AKD yielded contact angles of approx. 90-100° , which indicated that the surface was water repellent and devoid of a tendency of water absorption into the wood. It also indicates that a heating treatment following the AKD sizing has only a marginal bearing on the hydrophobicity of the wood and that heating of excessive duration may have a negative impact.
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Chemical And Physical Treatments For Wood And The Like (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA2533114A CA2533114C (en) | 2003-07-25 | 2004-07-23 | Treatment of thermally modified wood |
DE602004031233T DE602004031233D1 (en) | 2003-07-25 | 2004-07-23 | TREATMENT OF THERMALLY MODIFIED WOOD |
AT04742205T ATE496747T1 (en) | 2003-07-25 | 2004-07-23 | TREATMENT OF THERMALLY MODIFIED WOOD |
EP04742205A EP1651402B1 (en) | 2003-07-25 | 2004-07-23 | Treatment of thermally modified wood |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI20031103A FI118958B (en) | 2003-07-25 | 2003-07-25 | Treatment of heat modified wood |
FI20031103 | 2003-07-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005009700A1 true WO2005009700A1 (en) | 2005-02-03 |
Family
ID=27636131
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FI2004/000462 WO2005009700A1 (en) | 2003-07-25 | 2004-07-23 | Treatment of thermally modified wood |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP1651402B1 (en) |
AT (1) | ATE496747T1 (en) |
CA (1) | CA2533114C (en) |
DE (1) | DE602004031233D1 (en) |
ES (1) | ES2358800T3 (en) |
FI (1) | FI118958B (en) |
WO (1) | WO2005009700A1 (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1716995A2 (en) | 2005-04-22 | 2006-11-02 | Georg-August-Universität Göttingen | Composition based on fatty acids and paraffin derivatives for protecting lignocellulosic materials |
WO2009156594A1 (en) * | 2008-06-27 | 2009-12-30 | Dynea Oy | Method for treating a wood board |
DE102010031892A1 (en) | 2010-07-21 | 2012-01-26 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Fiber-reinforced composite material useful e.g. for producing molded bodies for producing building materials, comprises polymer matrix based on polymer, and fibers, preferably natural fibers incorporated into polymer matrix |
CN102554991A (en) * | 2012-02-14 | 2012-07-11 | 中国林业科学研究院木材工业研究所 | Method for improving whole hydrophobicity of wood |
CN103302708A (en) * | 2013-05-08 | 2013-09-18 | 广东省宜华木业股份有限公司 | Preparation method of novel hydrophobic wood |
EP2730382A1 (en) * | 2008-06-06 | 2014-05-14 | Metsäliitto Osuuskunta | Method of treating wood |
US9040608B2 (en) | 2010-04-01 | 2015-05-26 | Evonik Degussa Gmbh | Curable mixture |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007057116A1 (en) | 2007-11-26 | 2009-05-28 | Manfred Fordermaier | Covering as parquet or wall panels or cover panels or sun-blind in internal and external area, and for use with boat building, is made up of thermally treated solid wood which is flexible |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0327215A1 (en) * | 1988-01-18 | 1989-08-09 | Hercules Incorporated | Stable aqueous emulsions of ketene dimer/nonreactive hydrophobe |
WO2002081159A2 (en) * | 2001-04-03 | 2002-10-17 | Lonza Ag | Method for the protective treatment of wood and derived timber products |
-
2003
- 2003-07-25 FI FI20031103A patent/FI118958B/en active IP Right Grant
-
2004
- 2004-07-23 EP EP04742205A patent/EP1651402B1/en not_active Not-in-force
- 2004-07-23 CA CA2533114A patent/CA2533114C/en not_active Expired - Fee Related
- 2004-07-23 ES ES04742205T patent/ES2358800T3/en active Active
- 2004-07-23 WO PCT/FI2004/000462 patent/WO2005009700A1/en active Search and Examination
- 2004-07-23 AT AT04742205T patent/ATE496747T1/en not_active IP Right Cessation
- 2004-07-23 DE DE602004031233T patent/DE602004031233D1/en active Active
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0327215A1 (en) * | 1988-01-18 | 1989-08-09 | Hercules Incorporated | Stable aqueous emulsions of ketene dimer/nonreactive hydrophobe |
WO2002081159A2 (en) * | 2001-04-03 | 2002-10-17 | Lonza Ag | Method for the protective treatment of wood and derived timber products |
Non-Patent Citations (1)
Title |
---|
CALLUM A.S. ET AL.: "The chemical modification of scots pine with succinic anhydrode or octenyl succinic anhydride", HOLZFORSCHUNG, vol. 52, 1998, pages 427 - 433, XP002996213 * |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1716995A2 (en) | 2005-04-22 | 2006-11-02 | Georg-August-Universität Göttingen | Composition based on fatty acids and paraffin derivatives for protecting lignocellulosic materials |
EP1716995A3 (en) * | 2005-04-22 | 2007-07-04 | Georg-August-Universität Göttingen | Composition based on fatty acids and paraffin derivatives for protecting lignocellulosic materials, |
EP2730382A1 (en) * | 2008-06-06 | 2014-05-14 | Metsäliitto Osuuskunta | Method of treating wood |
US8771551B2 (en) | 2008-06-06 | 2014-07-08 | Metsäliitto Osuuskunta | Method of treating wood |
WO2009156594A1 (en) * | 2008-06-27 | 2009-12-30 | Dynea Oy | Method for treating a wood board |
EA024957B1 (en) * | 2008-06-27 | 2016-11-30 | Серфактор Джермани Гмбх | Method for treating a wood board |
US10335977B2 (en) | 2008-06-27 | 2019-07-02 | Surfactor Germany Gmbh | Method for treating a wood board |
US9040608B2 (en) | 2010-04-01 | 2015-05-26 | Evonik Degussa Gmbh | Curable mixture |
DE102010031892A1 (en) | 2010-07-21 | 2012-01-26 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Fiber-reinforced composite material useful e.g. for producing molded bodies for producing building materials, comprises polymer matrix based on polymer, and fibers, preferably natural fibers incorporated into polymer matrix |
DE102010031892B4 (en) | 2010-07-21 | 2019-01-03 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Fiber-reinforced composites, processes for their preparation and their use |
CN102554991A (en) * | 2012-02-14 | 2012-07-11 | 中国林业科学研究院木材工业研究所 | Method for improving whole hydrophobicity of wood |
CN103302708A (en) * | 2013-05-08 | 2013-09-18 | 广东省宜华木业股份有限公司 | Preparation method of novel hydrophobic wood |
Also Published As
Publication number | Publication date |
---|---|
ES2358800T3 (en) | 2011-05-13 |
FI20031103A0 (en) | 2003-07-25 |
CA2533114A1 (en) | 2005-02-03 |
DE602004031233D1 (en) | 2011-03-10 |
CA2533114C (en) | 2012-11-20 |
FI118958B (en) | 2008-05-30 |
ATE496747T1 (en) | 2011-02-15 |
EP1651402A1 (en) | 2006-05-03 |
FI20031103A (en) | 2005-01-26 |
EP1651402B1 (en) | 2011-01-26 |
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