WO2004047539A1 - Procede de traitement du bois et composition chimique - Google Patents

Procede de traitement du bois et composition chimique Download PDF

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Publication number
WO2004047539A1
WO2004047539A1 PCT/US2002/037065 US0237065W WO2004047539A1 WO 2004047539 A1 WO2004047539 A1 WO 2004047539A1 US 0237065 W US0237065 W US 0237065W WO 2004047539 A1 WO2004047539 A1 WO 2004047539A1
Authority
WO
WIPO (PCT)
Prior art keywords
wood
acid
aqueous solution
preservative
combination
Prior art date
Application number
PCT/US2002/037065
Other languages
English (en)
Inventor
Glenn P. Wampole, Sr.
Original Assignee
Wampole Glenn P Sr
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 Wampole Glenn P Sr filed Critical Wampole Glenn P Sr
Priority to PCT/US2002/037065 priority Critical patent/WO2004047539A1/fr
Priority to AU2002346439A priority patent/AU2002346439A1/en
Priority to US10/535,044 priority patent/US7179327B2/en
Publication of WO2004047539A1 publication Critical patent/WO2004047539A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D15/00—Woodstains
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N59/00—Biocides, pest repellants or attractants, or plant growth regulators containing elements or inorganic compounds
    • A01N59/12—Iodine, e.g. iodophors; Compounds thereof
    • 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
    • B27K2200/00—Wooden materials to be treated
    • B27K2200/10—Articles made of particles or fibres consisting of wood or other lignocellulosic material
    • 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
    • B27K3/30—Compounds of fluorine
    • 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
    • B27K3/52—Impregnating agents containing mixtures of inorganic and organic compounds

Definitions

  • This invention is directed towards a process and chemical composition for treating wood and similar porous surfaces so as to render the wood resistant to termites, mold, other fungi, and bacteria.
  • the invention also relates to an improved chemical composition useful for imparting to wood resistance against termites, fungus, and bacterial organisms.
  • This invention relates to a process and a chemical composition useful in the preservation of wood and wood fiber products against damage caused by insects such as termites, as well as other destructive organisms including fungus and bacteria.
  • a variety of techniques are known in the art directed to the preservation of wood and wood-containing products.
  • a physical barrier such as paint may be applied to the surface of the wood to prevent injury or attack by a destructive organism.
  • a paint barrier is not suitable to use as an extended barrier for wood surfaces which are in contact with the soil.
  • painted wood surfaces may lack the durability needed for extreme environmental conditions such as an outdoor deck material.
  • One suitable process of treating wood with a preservative comprises providing a wood substrate; applying to the wood substrate an aqueous solution comprising about 0.5% to about 50% by weight of an iodic acid, a periodic acid, or a combination thereof; about 0.05% to about 10% by weight of a fluorinated surfactant with a perfluorinated chain; and, optionally, an effective stabilizing amount of an ethoxylated nonylphenol; wherein the aqueous solution reacts with the wood substrate to form an insoluble iodine matrix within the wood substrate, the iodine matrix providing a moisture resistant barrier imparting to the wood preservative properties against termites and decay.
  • Another suitable wood preservative formulation may be provided by an aqueous solution comprising about 0.5% to about 50% by weight of an iodic acid, a periodic acid, or a combination thereof; about 0.05% to about 10% by weight of a fluorinated surfactant with a perfluorinated chain; and, optionally, an effective stabilizing amount of an ethoxylated nonylphenol.
  • the formulation may be diluted with water or other aqueous-based liquid to provide a desired working solution.
  • the term “decay” is used to describe a process of wood degradation that may occur from insects, such as termites, fungi, mold, and bacteria or degradation from a combination of these organisms or from exposure to excess moisture.
  • the term “preservative”, and variations thereof, include chemical compositions and treatments which provide resistance to decay.
  • the present invention provides a preservative useful in protecting wood, wood products, and other porous materials. Additionally, the preservative and process described herein also provides a water and moisture barrier to the treated surface.
  • the preservative may be provided by a stabilized solution of iodic acid, a stabilized solution of periodic acid, or a stabilized mixture of iodic and periodic acid.
  • the solution of iodic acid, periodic acid, or a blend of both iodic and periodic acids are referred to generally as a stablized iodine solution.
  • an aqueous solution of periodic and/or iodic acid provides a water soluble preservative useful for treating wood.
  • iodine solution When lumber, processed wood products, cellulosic products, or other porous materials such as natural or synthetic fabrics, are surface treated with the stabilized aqueous iodine solution, the iodine solution enters in to the substrate.
  • the iodine present within the iodine solution is highly reactive with other materials, particularly with cellulose, lignin, and other organic constituents commonly found in wood and cellulosic containing products. While not wishing to be limited by theory, it is believed that either elemental iodine or an iodine reaction product is formed within the wood or other cellulose-containing substrate.
  • the resulting reaction product has been found to be stable, i.e., resistant to leaching, and persists within the wood or cellulosic product without noticeable loss of initial treatment color or diminished effectiveness as a preservative.
  • an iodine reaction product or matrix is formed.
  • the iodine matrix has been found to provide the substrate with resistance to decay and also limits water absorption. While not wishing to be limited by theory, it is Applicant's belief that the matrix material which forms from the iodine solution contains at least a portion of elemental iodine or other insoluble reaction product of iodine.
  • the iodine matrix has been found to not leach from a treated wood substrate.
  • the resulting matrix is characterized as being a hardened material which is itself non-porous, is insoluble in water, provides water resistance with respect to the substrate, and provides resistance to decay.
  • lodic acid and periodic acid solutions are highly reactive and will rapidly react and/or break down in the presence of a suitable reagent or substrate.
  • exposure to light or high temperatures also results in the decomposition of liquid solutions of iodic and periodic acids. Because of these properties of iodic acid and periodic acid, solutions of these materials are not stable for long-term storage.
  • liquid solutions of periodic and iodic acid may be stabilized so as to provide an adequate shelf life such that liquid forms of the iodic and periodic acid may be used in the treatment of lumber, wood products, and other porous materials.
  • the ability to stabilize aqueous solutions of periodic and/or iodic acid are surprising given the highly reactive nature of the reagents.
  • the inclusion of the polyfluoro-sulfonic acid and/or fluorinated anionic surfactant will extend the shelf life of the iodic and/or periodic acid. It has been found that adding the fluorinated surfactant to a stock solution of iodic or periodic acid containing composition at a concentration of between about 0.1% to about 10% will provide improved solution stability as well as maintaining the desirable surfactant activity.
  • an emulsifying agent to improve the treatment efficiency of the iodine containing preservative formulation.
  • emulsifiers available from Ethox Chemicals, Inc., Greenville, South Carolina (USA), under the trade name Ethal NP-370 has been found to be effective and has been further found to improve solution stability for a concentrate.
  • the NP-370 is a polyoxyethylene nonylphenyl ether. A 1.0% to about 7% addition of a 30 mole Ethal NP-370 to a concentrate has been found to provide suitable emulsifying properties while offering the unexpected advantage of improving the stability of the solution for a shelf life of at least three months.
  • Table 1 Set forth below in Table 1 is a preferred exemplary embodiment of a stabilized iodine solution concentrate.
  • the concentrate has been found to exhibit a shelf life of at least three months while maintaining the useful surfactant and emulsifying properties of the listed additives.
  • the periodic acid may be obtained at a 50% concentration from Ajay North America, L.L.C., Powder Springs, Georgia (USA).
  • the concentrate solution of Table 1 may be diluted to a working concentration found useful for the surface treatment of wood and other cellulosic substrates. It is believed that the working solution concentration may vary depending upon the particular substrate being treated. More diluted or more concentrated working solutions are believed to also be effective. It has been found that the working solution may be sprayed, or applied with brush or roller to the surface of a wooden board. Additionally, the working solution may be applied to a wood or similar substrate by impregnating the wood under pressure with the working solution of the preservative formulation such as the one provided in Table 2. Any suitable pressure vessel may be employed.
  • the wood is preferably air dried at ambient temperature. Following drying, a sample of the wood may be cut and penetration of the formulation may be determined by visualization of the noted color change within the wood. If needed, the conditions of pressure and dwell time may be modified so as to achieve greater or lesser penetration of the wood with the preservative.
  • the working solution may also be varied to provide for a more or a less concentrated working solution which would also affect the preservative qualities of the end product.
  • a more concentrated working solution along with more aggressive application techniques may be used to treat the wood products.
  • enhanced concentrations of the iodine matrix reaction product will occur and are believed to afford greater protection against biological degradation or water damage.
  • the surface of the board undergoes an immediate color change to a tan or tannish-orange color.
  • the color change is believed to represent the rapid formation of an iodine reaction product which persists within the wood in a substantially insoluble form.
  • the iodine reaction product is present within the wood or cellulose matrix and renders the wood resistant to decay. Further, the reaction product, while not providing a barrier surface to water and moisture, appears to limit moisture uptake and makes the substrate resistant to the deleterious effects of water and moisture which would otherwise occur on untreated wood.
  • CCA pressure treated 4x4 posts had a portion of the posts additionally treated with a surface application of the stabilized iodine solution as set forth in Table 2.
  • the stabilized iodine solution formed the characteristic color change as noted above and appears to be compatible with existing pressure treated wood.
  • the portion of the post treated only with CCA exhibits a high level of surface mold and has undergone a characteristic weathering color loss.
  • adjacent sections of the post surface treated with the stabilized iodine solution as set forth in Table 1 has exhibited no surface mold growth. In addition, there has been no loss or degradation of the initial color.
  • the stabilized iodine solution provides for a treated wood product which is resistant to termites, fungi and mold, bacteria, and damage from moisture.
  • the iodine matrix appears to render the surface and treated interior portions of the wood with an iodine-derived material which will not support the growth or maintenance of destructive organisms.
  • the stabilized iodine treatment may interact favorably with conventional CCA pressure treated lumber so as to prevent or degrade leaching of CCA compounds from the wood. If demonstrated, the stabilized iodine solution could be used to advantage to surface treat existing CCA treated wood structures so as to minimize further leaching from the subsequently treated surfaces. In any event, the surface treatment with the iodine preservative is compatible with previously pressure treated wood and affords the surface of the wood enhanced protection against surface mold growth.
  • iodic acid may also be used in a similar manner. Likewise, combinations of iodic and periodic acid may also be employed.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Agronomy & Crop Science (AREA)
  • Inorganic Chemistry (AREA)
  • Pest Control & Pesticides (AREA)
  • Plant Pathology (AREA)
  • Health & Medical Sciences (AREA)
  • Dentistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Zoology (AREA)
  • Environmental Sciences (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)

Abstract

L'invention concerne le traitement et la préservation du bois, de produits en fibres de bois et de surfaces poreuses à l'aide d'une solution stabilisée d'acide périodique ou d'acide iodique.
PCT/US2002/037065 2001-02-20 2002-11-20 Procede de traitement du bois et composition chimique WO2004047539A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
PCT/US2002/037065 WO2004047539A1 (fr) 2002-11-20 2002-11-20 Procede de traitement du bois et composition chimique
AU2002346439A AU2002346439A1 (en) 2002-11-20 2002-11-20 Wood treatment process and chemical composition
US10/535,044 US7179327B2 (en) 2001-02-20 2002-11-20 Wood treatment process and chemical composition

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2002/037065 WO2004047539A1 (fr) 2002-11-20 2002-11-20 Procede de traitement du bois et composition chimique

Publications (1)

Publication Number Publication Date
WO2004047539A1 true WO2004047539A1 (fr) 2004-06-10

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2002/037065 WO2004047539A1 (fr) 2001-02-20 2002-11-20 Procede de traitement du bois et composition chimique

Country Status (2)

Country Link
AU (1) AU2002346439A1 (fr)
WO (1) WO2004047539A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7179327B2 (en) 2001-02-20 2007-02-20 Wampole Sr Glenn P Wood treatment process and chemical composition

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5470614A (en) * 1994-03-02 1995-11-28 The United States Of America As Represented By The Secretary Of Agriculture Treatment of wood and other lignocellulosic materials with iodates
US5910503A (en) * 1997-10-28 1999-06-08 Rohm And Haas Company Stable microbicide formulation
US6008238A (en) * 1997-10-28 1999-12-28 Rohm And Haas Company Stabilization of 3-isothiazolone solutions

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5470614A (en) * 1994-03-02 1995-11-28 The United States Of America As Represented By The Secretary Of Agriculture Treatment of wood and other lignocellulosic materials with iodates
US5910503A (en) * 1997-10-28 1999-06-08 Rohm And Haas Company Stable microbicide formulation
US6008238A (en) * 1997-10-28 1999-12-28 Rohm And Haas Company Stabilization of 3-isothiazolone solutions

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
CHEN ET AL.: "Fungal and termite resistance of wood reacted with periodic acid or sodium periodate", WOOD AND FIBER SCIENCE, vol. 21, no. 2, 1989, pages 163 - 168, XP002960120 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7179327B2 (en) 2001-02-20 2007-02-20 Wampole Sr Glenn P Wood treatment process and chemical composition

Also Published As

Publication number Publication date
AU2002346439A1 (en) 2004-06-18

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