CA2407892A1 - Permanent decrease of wood hardness - Google Patents
Permanent decrease of wood hardness Download PDFInfo
- Publication number
- CA2407892A1 CA2407892A1 CA002407892A CA2407892A CA2407892A1 CA 2407892 A1 CA2407892 A1 CA 2407892A1 CA 002407892 A CA002407892 A CA 002407892A CA 2407892 A CA2407892 A CA 2407892A CA 2407892 A1 CA2407892 A1 CA 2407892A1
- Authority
- CA
- Canada
- Prior art keywords
- wood
- prepolymer
- group
- wood preservative
- solution
- 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
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
- B27K3/16—Inorganic impregnating agents
- B27K3/22—Compounds of zinc or copper
-
- 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
-
- 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
- B27K3/16—Inorganic impregnating agents
- B27K3/26—Compounds of iron, aluminium, or chromium
-
- 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
- B27K3/16—Inorganic impregnating agents
- B27K3/28—Compounds of arsenic or antimony
-
- 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
- B27K5/06—Softening or hardening of wood
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L97/00—Compositions of lignin-containing materials
- C08L97/02—Lignocellulosic material, e.g. wood, straw or bagasse
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
- C08L33/04—Homopolymers or copolymers of esters
- C08L33/14—Homopolymers or copolymers of esters of esters containing halogen, nitrogen, sulfur, or oxygen atoms in addition to the carboxy oxygen
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L71/00—Compositions of polyethers obtained by reactions forming an ether link in the main chain; Compositions of derivatives of such polymers
- C08L71/02—Polyalkylene oxides
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Chemical & Material Sciences (AREA)
- Forests & Forestry (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Materials Engineering (AREA)
- Chemical And Physical Treatments For Wood And The Like (AREA)
- Polymerisation Methods In General (AREA)
Abstract
A wood article is submitted to a vacuum in an autoclave to remove air that i t contains. Then, a solution which contains a water-soluble cross-linkable prepolymer, a polymerization initiator and optionally a wood preservative is introduced into the autoclave. Polymerization to form a polymeric network in the wood article is carried out in an atmosphere which may be substantially free of oxygen, while the optionally present preservative is chemically fixe d to the wood. The result is a wood article with a permanently reduced hardnes s and an increased moisture content at equilibrium.
Claims (36)
1. A method for the treatment of. wood to impart thereto permanently reduced hardness, comprising the steps of:
(a) providing articles of wood;
(b) introducing said articles of wood into as autoclave under conditions to substantially remove air contained therein;
(c) introducing into laid autoclave an aqueous treatment solution, said treatment solution comprising a water-soluble cross-linkable prepolymer having a molecular weight lower than 10.000, and impregnating said articles of wood with said treatment solution; and (d) heating the impregnated articles of wood in a gaseous atmosphere and in the presence of an oxidizing agent, to cause cross-linking of said prepolymer.
(a) providing articles of wood;
(b) introducing said articles of wood into as autoclave under conditions to substantially remove air contained therein;
(c) introducing into laid autoclave an aqueous treatment solution, said treatment solution comprising a water-soluble cross-linkable prepolymer having a molecular weight lower than 10.000, and impregnating said articles of wood with said treatment solution; and (d) heating the impregnated articles of wood in a gaseous atmosphere and in the presence of an oxidizing agent, to cause cross-linking of said prepolymer.
2. Method according to claim 1, wherein said gaseous atmosphere its an inert atmosphere, which is substantially free of oxygen.
3. Method according to claim 1, wherein sand gaseous atmosphere comprises oxygen.
4. Method according to claim 1 wherein said articles of wood treated in step (d) are free of wood preservative.
5. Method according to claim 1 which comprises providing articles of wood pre-treated with a wood preservative.
6. Method according to claim 1 which comprises adding a wood preservative into said treatment solution, and impregnating said articles of wood with said wood preservative during step (c).
7. Method according to claim 1 which comprises impregnating a wood preservative into said wood articles before introducing same into said treatment solution, said treatment solution being substantially free of said wood preservative.
8. Method according to claim 5 wherein said treatment, solution comprises water, said polymerization initiator and said water soluble prepolymer, said prepolymer being cross-linkable in said wood is die presence of said wood preservative.
9. Method according to claim 1 wherein said treatment solution is prepared by adding said water soluble prepolymer to a solution of said wood preservative, said prepolymer being cross-linkable in said wood in the presence of said wood preservative, and adding a polymerization initiator to the solution previously obtained.
10. Method according to claim 6, wherein said wood preservatives ere based on copper or chromium or arsenic or zinc or boron or fluorine or phosphorous compounds or a combination of at least two of these compounds.
11. Method according to claim 10, wherein the wood preservative comprises chromated copper arsenate.
12. Method according to claim 6, wherein said wood preservative having at least one reactive group enabling its introduction in the polymer matrix at the cross-linking step, said reactive group selected from allyl, vinyl, acrylate or methacrylate or issued from compounds having at least one reactive double bond.
13. Method . according to claim 12, wherein said wood preservative comprises water soluble salts.
14. Method according to claim 13, wherein said water-soluble salts comprise acrylate of Cu, Cr, Zn.
15. Method according to claim 6, wherein said wood preservative is chemically fixed in said pre polymer.
16. Method according to claim 6, wherein said wood preservative is solubilized in water using surfactant material.
17. Method according to claim 16, wherein said wood preservative comprises pentachlorophenol.
18. Method according to claim 1, wherein the first step is carried out under a vacuum of about 600-650 mm, Hg.
19. Method according to claim 11, wherein said solution contains about 2%
w/v of chromated copper arsenate.
w/v of chromated copper arsenate.
20. Method according to claim 19, wherein said solution is introduced into said autoclave at a pressure of about 1000-1040 kPa so as to facilitate penetration of the preservative into wood.
21. Method according to claim 20, wherein said pressure is maintained for a period of time that allows for penetration of said chemicals in sapwood, after which the solution is flushed away from the autoclave and temperature is then maintained within a range from 25°C to 100°C for a period of time that allows for a substantial fixation of all the CCA components in the wood and a polymerization of the prepolymers in the wood.
22. Method according to claim 1, wherein said solution contains about 4 to 10% w/v of said prepolymer and up to about 5 weight percent of said polymerization initiator with respect to said prepolymer.
23. Method according to claim 21, wherein said third step is carried out at a temperature between about 25 and 104°C for about 2.5 to 48 hours.
24. Method according to claim 1, wherein said solution contains a crosslinking agent in a concentration between 1 to 20% v/v with respect to said prepolymer.
25. Method according to claim 24, wherein said crosslinking agent is selected from the group consisting of trimethylolpropane trimethacrylate, trimethylolpropane triacrylate, glycerol trimethacrylate and glycerol triacrylate.
26. Method according to claim 1, wherein said prepolymer is a copolymer of formula:
B' A B' wherein A is a homopolymer or copolymer of ethylene oxide or derivatives thereof, and B' is an acrylate group of the formula:
wherein R is H or CH3.
B' A B' wherein A is a homopolymer or copolymer of ethylene oxide or derivatives thereof, and B' is an acrylate group of the formula:
wherein R is H or CH3.
27. Method according to claim 26, wherein said prepolymer is a polyethylene glycol diacrylate or dimethacrylate.
28. Method according to claim 1, wherein said prepolymer is a copolymer of formula:
wherein Z is a residue of a compound having at least one active hydrogen, k is a whole number between 1 and 6, m is a number equal to 0 or whole number not less than 1, n is a number equal to 0 or whole number not less than 1, B" is an alkyl group, an aryl group or a group having at least one reactive double bound, R is an allyl group, an alkenyl group or a group of formula:
-CH2-O-R c-R a, wherein R a is an alkyl or alkenyl group and R c is a segment of formula -(CH2CH2O)p-wherein p is whole number which varies between 0 and 25.
wherein Z is a residue of a compound having at least one active hydrogen, k is a whole number between 1 and 6, m is a number equal to 0 or whole number not less than 1, n is a number equal to 0 or whole number not less than 1, B" is an alkyl group, an aryl group or a group having at least one reactive double bound, R is an allyl group, an alkenyl group or a group of formula:
-CH2-O-R c-R a, wherein R a is an alkyl or alkenyl group and R c is a segment of formula -(CH2CH2O)p-wherein p is whole number which varies between 0 and 25.
29. Method according to claim 28 wherein.
Z is a residue of glycerin or trimethylolpropane and k is a number equal to 3.
Z is a residue of glycerin or trimethylolpropane and k is a number equal to 3.
30. Method according to claim 28 wherein Z is a residue of ethylene glycol and k is a number equal to 2.
31, Method according to claim 1, wherein said prepolymer is a copolymer of type:
AB'"A
wherein A represents a segment derived from homopolymers or copolymers of ethylene oxide or derivatives thereof, and B"' represents segments comprising of radicals having at least one double bond.
AB'"A
wherein A represents a segment derived from homopolymers or copolymers of ethylene oxide or derivatives thereof, and B"' represents segments comprising of radicals having at least one double bond.
32. Method according to claim 31, wherein B'" comprises radicals derived from alkynes, styrene or dimethylfurane.
33. Method according to claim 31, wherein A represents a. POE or a copolymer POE/POP and B"' is a vinyl group:
34. Method according to claim 1, wherein said prepolymer is a random polyether copolymer of ethylene oxide and an ether nude selected from the group consisting of substituted ether oxide of formula:
wherein R is R a, wherein R a is an alkyl, alkenyl or alkynyl having 1 to 12 carbon atoms or -CH2-O-R e-R a wherein R a is defined abave, R e is a polyether of the formula -(CH2CH2-O)p, wherein p is an integer from 0 to 10 or a cyclic ether wherein the ring has more than 3 carbon atoms.
wherein R is R a, wherein R a is an alkyl, alkenyl or alkynyl having 1 to 12 carbon atoms or -CH2-O-R e-R a wherein R a is defined abave, R e is a polyether of the formula -(CH2CH2-O)p, wherein p is an integer from 0 to 10 or a cyclic ether wherein the ring has more than 3 carbon atoms.
35. Method according to claim 1, wherein said polymerization initiator is selected from the group consisting of : ~1) 2,2'azobis[2-(2-imidazolin-2-yl)propane]-dihydro chloride 2) azobis(2-amidinopropane)dihydro chloride 3) 2,2'-azobis[2-(2-imidazolin-2-yl)propane]
4) 4,4-azobis(4-cyanovaleric acid) 5) 2,2'-azobis[2-methyl-N-(2-hydroxyethyl)-propionamide.
4) 4,4-azobis(4-cyanovaleric acid) 5) 2,2'-azobis[2-methyl-N-(2-hydroxyethyl)-propionamide.
36. Method according to claim 1, wherein the oxidising agent consists of potassium persulphate.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CA2000/000563 WO2001087560A1 (en) | 2000-05-15 | 2000-05-15 | Permanent decrease of wood hardness |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2407892A1 true CA2407892A1 (en) | 2001-11-22 |
| CA2407892C CA2407892C (en) | 2012-01-03 |
Family
ID=4143059
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2407892A Expired - Lifetime CA2407892C (en) | 2000-05-15 | 2000-05-15 | Permanent decrease of wood hardness |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP1282492A1 (en) |
| AU (1) | AU2000247382A1 (en) |
| CA (1) | CA2407892C (en) |
| WO (1) | WO2001087560A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20070011557A (en) | 2004-05-07 | 2007-01-24 | 더 리젠츠 오브 더 유니버시티 오브 캘리포니아 | Treatment of myopia |
| SI2035198T1 (en) | 2006-06-21 | 2012-08-31 | Transfurans Chemicals | Method for modifying wood and wood thereby obtained |
| CN109789595A (en) | 2016-09-30 | 2019-05-21 | 陶氏环球技术有限责任公司 | Processed porous material |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4567115A (en) * | 1982-12-16 | 1986-01-28 | Bell Canada | Pressure impregnation of wood poles for preservation |
| JPH0681681B2 (en) * | 1988-02-01 | 1994-10-19 | 大建工業株式会社 | Chemical treatment of wood |
| JPH0617002B2 (en) * | 1988-07-27 | 1994-03-09 | 勇 能沢 | Bark peeling prevention and dimensional stabilization method |
| JPH03169504A (en) * | 1989-11-30 | 1991-07-23 | Miroku Kihan Kk | Modified woody material and modifying method for woody material |
| JPH05220712A (en) * | 1992-02-06 | 1993-08-31 | Mokuzai Seinou Kojo Gijutsu Kenkyu Kumiai | Treating agent and treating method for improving dimensional stability of wood |
| FR2694758B1 (en) * | 1992-08-14 | 1994-10-21 | Centre Nat Rech Scient | Crosslinkable copolymers obtained by polycondensation and ionically conductive material containing them. |
| US5731096A (en) * | 1995-08-04 | 1998-03-24 | Hydro-Quebec | Permanent decrease of wood hardness by in situ polymerization of pre-polymers |
-
2000
- 2000-05-15 AU AU2000247382A patent/AU2000247382A1/en not_active Abandoned
- 2000-05-15 WO PCT/CA2000/000563 patent/WO2001087560A1/en not_active Application Discontinuation
- 2000-05-15 CA CA2407892A patent/CA2407892C/en not_active Expired - Lifetime
- 2000-05-15 EP EP00929171A patent/EP1282492A1/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| AU2000247382A1 (en) | 2001-11-26 |
| CA2407892C (en) | 2012-01-03 |
| WO2001087560A1 (en) | 2001-11-22 |
| EP1282492A1 (en) | 2003-02-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDC | Discontinued application reinstated | ||
| MKEX | Expiry |
Effective date: 20200515 |