WO2011144729A2 - Composition de produit de préservation - Google Patents

Composition de produit de préservation Download PDF

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Publication number
WO2011144729A2
WO2011144729A2 PCT/EP2011/058241 EP2011058241W WO2011144729A2 WO 2011144729 A2 WO2011144729 A2 WO 2011144729A2 EP 2011058241 W EP2011058241 W EP 2011058241W WO 2011144729 A2 WO2011144729 A2 WO 2011144729A2
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WO
WIPO (PCT)
Prior art keywords
borate
wood
rosin
preservative composition
composition
Prior art date
Application number
PCT/EP2011/058241
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English (en)
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WO2011144729A3 (fr
Inventor
Risto Rahkola
Original Assignee
Kemira Oyj
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 Kemira Oyj filed Critical Kemira Oyj
Priority to AU2011254537A priority Critical patent/AU2011254537B2/en
Priority to BR112012029235A priority patent/BR112012029235A2/pt
Publication of WO2011144729A2 publication Critical patent/WO2011144729A2/fr
Publication of WO2011144729A3 publication Critical patent/WO2011144729A3/fr

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Classifications

    • 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
    • A01N55/00—Biocides, pest repellants or attractants, or plant growth regulators, containing organic compounds containing elements other than carbon, hydrogen, halogen, oxygen, nitrogen and sulfur
    • A01N55/08—Biocides, pest repellants or attractants, or plant growth regulators, containing organic compounds containing elements other than carbon, hydrogen, halogen, oxygen, nitrogen and sulfur containing boron
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
    • C04B41/46—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with organic materials
    • C04B41/47—Oils, fats or waxes natural resins
    • C04B41/474—Natural resins, e.g. rosin
    • 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
    • A01N59/14—Boron; Compounds thereof
    • 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
    • A01N65/00—Biocides, pest repellants or attractants, or plant growth regulators containing material from algae, lichens, bryophyta, multi-cellular fungi or plants, or extracts thereof
    • A01N65/06—Coniferophyta [gymnosperms], e.g. cypress
    • 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
    • B27K3/50—Mixtures of different organic impregnating agents
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L93/00—Compositions of natural resins; Compositions of derivatives thereof
    • C08L93/04—Rosin
    • 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
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M13/00—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment
    • D06M13/50—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment with organometallic compounds; with organic compounds containing boron, silicon, selenium or tellurium atoms
    • D06M13/503—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with non-macromolecular organic compounds; Such treatment combined with mechanical treatment with organometallic compounds; with organic compounds containing boron, silicon, selenium or tellurium atoms without bond between a carbon atom and a metal or a boron, silicon, selenium or tellurium atom
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06M—TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
    • D06M15/00—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment
    • D06M15/01—Treating fibres, threads, yarns, fabrics, or fibrous goods made from such materials, with macromolecular compounds; Such treatment combined with mechanical treatment with natural macromolecular compounds or derivatives 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
    • 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
    • B27K3/34—Organic impregnating agents

Definitions

  • the present invention relates to a preservative composition. More specifically the present invention relates to a preservative composition containing rosin dissolved in a mixture of alkyl borate and alcohol.
  • the preservative composition may be used for treating wood and other porous materials.
  • PCP pentachlorophenol
  • CCA chromated copper arsenate
  • Borates are considered acceptable wood preservatives from a human health and ecological perspective because of very low toxicity to both mammalian and aquatic organisms. Borates are effective preservatives against both fungi and insects and even considered more effective than copper or zinc compounds.
  • Class 5 - in salt water boric acid or borate is suitable to be used in class 1 , when wood is in dry atmosphere without risk of wetting. If boron would be fixed properly in the wood the treated wood would be applicable in any class.
  • BAE boric acid equivalent
  • the Bethell process starts with initial vacuum to draw air from wood cells. During the vacuum the cylinder is flooded with preservative. After that follows -15 bar pressure from 15 minutes to several hours before preservative solution is drained off. The final step is a vacuum to draw excessive preservative out of the wood.
  • the Lowry process is similar to the Bethell process but without the initial vacuum step.
  • the Rueping process uses initial pressure during flooding of the cylinder and otherwise it resembles the Bethell process. This treatment method is used for creosote oils to limit net uptake compared to other processes.
  • TrialkyI borate has been known as wood preservative for over 50 years (NZ1 15464). Its reactivity with hydroxyl compounds can be used as advantage since organic boron will form mainly boric acid with wood moisture and polybo- rates with some wood compounds. TrialkyI borate is easily impregnated in wood structure as gas or liquid.
  • Vinden et al. US2009/01 10842
  • Staminoroff US2009/0069271
  • Na- sheri US58718107
  • Yasuhisa et al. JP07-047515
  • Murphy et al. (US5330847)
  • Borate based materials may also be used for the treatment of non-wood materials, as described for example in US2005/0196628 A1 . In said publication man-made structures made with non-wood materials are protected from termite damages.
  • boric acid - alcohol diffusion ability is much less than of reac- tive trialkyi borate (US5871817) and the required high pressure or long treatment time may result in severe swelling of the wood.
  • Rosin can be dissolved in trialkyi borate, namely in trimethyl borate, since it is not soluble in higher molecular weight trialkyi borates.
  • maximum solubility of rosin in trimethyl borate is only -13 g / 100g and this concentration is most likely not enough to prevent boron leaching from wood.
  • Wood preservative or treated wood should meet several requirements (Suolahti, Osmo: Laho ja sen torjunta.
  • This invention relates to a preservative composition solution, where alkyl borate acts as precursor for boric acid based preservative and rosin is functioning as preservative and fixing agent for boric acid. It has been surprisingly discovered that rosin, for example tall oil rosin, has very high solubility in alkyl borate azeotrope or other alcohol composition at room temperature and the thus formed solution has unique properties, for example as a wood preservative.
  • the present invention provides a preservative composition for treating materials, said composition containing rosin dissolved and/or emulsified in a mixture of alkyl borate and alcohol.
  • the present invention also provides a method for treating materials by bringing the material into contact with the preservative composition of the invention.
  • One advantage of the present invention is that the composition penetrates easily into different materials and further remains in the material.
  • rosin is also a well known fungicide.
  • Another advantage of the present invention is that such a preservative composi- tion is environmentally beneficial.
  • boric acid as preservative is considered safe for mammals and when fixed in wood it is harmless for the environment.
  • the preservative can be produced totally without heavy metals or petrochemicals. Rosin is a known product of natural origin. Even if bio-based methanol was not available it can be totally recycled back to trialkyl borate production. Still another advantage of the present invention is the low energy consumption since it is not necessary to dry the wood below outdoor equilibrium moisture content, which is between 10-20% for wood in Nordic countries. In addition to this, conditioning to ambient atmosphere is enough and no additional steaming or wetting is needed for treated wood. Still another advantage of the present invention is that the composition may be cooled or let be cooled to any temperature, which is advantageous in storage and transportation.
  • Figure 1 shows rosin solubility in trimethyl borate - methanol
  • Figure 2 shows rosin solubility in triethyl borate - ethanol
  • Figure 3 shows rosin solubility in triisopropyl - isopropanol
  • the present invention provides a preservative composition for treating materials, said preservative composition containing rosin dissolved in a mixture of alkyl bo- rate and alcohol.
  • the rosin is emulsified in the mixture of alkyl borate and alcohol.
  • the composition may also contain both dissolved and emulsified rosin.
  • the present invention also provides methods for preparing said preservative compositions as described herein.
  • Alkyl refers to any suitable mono-, di-, tri-, tetra- or polysubsti- tuted alkylic compound. Examples of alkyls are disclosed in US2009/01 1842 para- graph [0063]. In one embodiment the alkyl borate is trialkyi borate. Generally the composition is in the form of a solution.
  • rosin such as tall oil rosin
  • Alkyl borate acts as precursor for boron preservative and soluble rosin is a fixing agent when alcohol is evaporated off.
  • the major advantage of the present invention is that the composition contain- ing alkyl borate and rosin penetrates easily into different materials and further remains in the material.
  • trialkyi borate reacts with moisture in wood and solidifies as boric acid, at the same time rosin is no longer soluble and it becomes solid as well.
  • Rosin contains high amount of abietic type of acids and its melting point is over 1 50 Q C. After the treatment the wood will have water repellent properties and boric acid is fixed against dissolution.
  • useful alkyl borates include trimethyl borate, trie- thyl borate, triisopropyl borate, diglyceryl borate and mixtures thereof.
  • the alcohol may be selected for example from water soluble C-I-C-I O alcohols as for example monovalent alcohols, such as methanol, ethanol, propanol, butanol, pentanol, hexanol and derivatives thereof; multivalent, such as divalent or trivalent alcohols.
  • the alcohol is a water soluble C 2 -C 7 alcohol.
  • the alcohol is multivalent, aliphatic, water soluble C 2 -C 5 alcohol, such as diole and triole.
  • the alcohol is glycerol, ethylene glycol or propylene glycol. Also a mixture of said alcohols may be used.
  • the alcohol is selected from methanol, ethanol, isopropanol, glycerol and mixtures thereof.
  • the rosin is dissolved or emulsified in a mixture of diglyceryl borate and glycerol.
  • heat may be used to promote the forming of the emulsion.
  • another alcohol such as ethanol, may be further added.
  • the solvent may be methanol-free which is less toxic and the preparation of the composition is easier.
  • the poor solubility of rosin to glycerol may be overcome by rising the temperature over the melting point of rosin (for example to 1 00-1 20 Q C) to obtain a useful emulsion (for example creosote impregnation is carried out at this temperature).
  • the rosin is dissolved or emulsified in a mixture of diglyceryl borate and ethanol. In still another embodiment the rosin is dissolved or emulsified in a mixture of diglyceryl borate, glycerol and ethanol.
  • the rosin is dissolved or emulsified in a mixture of trimethyl borate and methanol. In still another embodiment the rosin is dissolved or emulsified in a mixture of triethyl borate and ethanol. In still another embodiment the rosin is dissolved or emulsified in a mixture of triisopropyl borate and isopropanol.
  • the alkyl borate is in the form of azeotrope with an alcohol.
  • Alkyl borate - alcohol azeotrope is produced when boric acid and alcohol react in a reaction column. Azeotrope is distilled as overflow and side product water is withdrawn from column bottom.
  • the rosin is dissolved or emulsified in an azeotrope of trimethyl borate in methanol. In one embodiment the rosin is dissolved or emulsified in an azeotrope of triethyl borate in ethanol. In one embodiment the rosin is dissolved or emulsified in an azeotrope of triisopropyl borate in isopropanol.
  • Trimethyl borate azeotrope contains approximately 70% trimethyl borate in methanol, triethyl borate azeotrope approximately 30% triethyl borate in ethanol and triisopropyl borate azeotrope approximately 5% triisopropyl borate in isopropanol.
  • One advantage of the azeotrope solution is that it is less expensive than pure alkyl borate as boric acid equivalent. In case of high moisture in wood, alkyl borate will react to form solid boric acid just at the surface and prevent diffusion across the material. Such a situation will be avoided by azeotrope where alcohol acts as vehicle into deeper parts of wood (see US2009/01 10842 paragraph [0005]).
  • Alkyl borate azeotrope is an electricity conductive solution, but alkyl borate is an insulat- ing liquid. In pure form alkyl borate easily creates electrostatic discharges during pumping or transferring, which poses a safety risk.
  • Rosin is a solid form of resin obtained from pines and some other plants, mostly conifers, produced by heating fresh liquid resin to vaporize the volatile liquid ter- pene components.
  • the rosin is se- lected e.g. from wood rosin, gum rosin, tall oil rosin or mixtures thereof.
  • Tall oil rosin is considered as a low cost side product from the distillation of crude tall oil (CTO). Crude tall oil is a by-product obtained from the kraft paper making process. Normal delivery form is hot molten, but in this application tall oil rosin can be used as solid. Alternative rosin is obtained from aged pine stumps which are chipped and soaked in a solvent; this extracted form of rosin is called wood rosin. Yet applicable rosin in a preservative is gum rosin obtained from living trees.
  • CTO crude tall oil
  • tall oil derivatives are effective preservatives against decay especially with high loading in wood.
  • boron concentration may be less with rosin additive than would be in bare boron-based preservative to reach required preservative properties.
  • wood refers to all materials and products containing ligno- cellulosic material, including raw timber, sawn timber, wooden construction materials and elements and wood-plastic composite products, and further, various processed wood products such as round logs, all sawn timber such as boards, planks, laths, flat elements such as laminates, for example chipboard, plywood or LVL products (Laminated Veneer Lumber), panels, slabs, wall elements and the like, furniture for indoors and outdoors, and other wooden articles and objects.
  • the wood product to be treated may also be present in immobile structures, particularly outdoors, such as wooden buildings, fences, framings, pillars, bridges, piers etc.
  • the composition is suitable for the treatment of both processed timber and raw timber, and the treatment can be given for example at wood storage sites or in a separate processing mill for timber, wherein the treatment composition and the wood can be brought into contact in a variety of ways.
  • the invention is suitable for the preservation of stationary structures already erected, particularly outdoors, wherein primarily spraying and brushing of the surfaces can be used. It should be noted that thanks to the safety of the composition, it can be used for the treatment of erected wooden structures in their locations of use without particular safety measures.
  • the composition is also suitable for products consisting not only of wood but of a combination of wood and another material.
  • the composition may also be used to other non-wooden porous materials, such as concrete, tiles and cotton batting. The embodiments explained herein with wood treatment applications may also be applied to these materials as well.
  • the treatment composition Prior to the treatment of the material, the treatment composition may be diluted with alcohol to give the concentration required by the treatment.
  • the present invention provides a method for treating materials by bringing the material into contact with the preservative composition of the invention to protect the material and to obtain preserved material, such as wood. Any suitable method may be used to promote the composition to enter the material.
  • the composition may be in the form of a solution or an emulsion.
  • the composition may be contacted to the material to be treated and absorbed over the whole thickness thereof, or to a certain depth from the surface, for exam- pie by impregnation, immersion, spraying, or by application with a brush (painting). Physical properties of the composition such as viscosity may be adjusted according to the type and purpose of the treatment. In case of some emulsions the composition may be as a (solid) suspension when stored (in room temperature) and it will be entered to the material in a melted form.
  • the composition suits particularly well for treatment processes requiring good penetrability into material such as wood, for example impregnation.
  • the composition can be entered into the wood, for example, in the known pressure impregnation process, in which the wood is at first kept under negative pressure to remove water from its inside, after which the composition is brought into contact with the wood and its penetration into the wood is enhanced by overpressure.
  • the composition of the invention may be heated and/or elevated temperature may be used in the process, thus further improving the absorption. Absorption is also improved by sub- and superatmospheric pressures as is known for conventional CCA impregnation. Contrary to heating the composition may be cooled or let be cooled to any temperature. Testing of the composition at -20 Q C affected turbidity and thickness, but it still remained pumpable. Heating the turbid liquid to room temperature made it a clear solution again. This is a real benefit in transportation or storage e.g. in Nordic countries at winter time. Common waterborne preservatives do not tolerate freez- ing.
  • the invention makes it possible to treat materials in a light and cost-efficient way, and the treatment can be easily included in other present-day steps of wood treatment.
  • the process may be one step in a processing line of timber or wooden objects comprising successive steps.
  • practical examples will be given of methods how the treatment composition can be used for the treatment of wood and how the treatment can be integrated in a wood material processing line in mills for wood processing. Any other porous materials other than wood can be applied as well. 1 ) Pressure impregnation
  • the best penetrability of compositions is obtained, and the wood can normally be impregnated to the core.
  • the composition according to the invention has a very good penetrability, wherein it is possible to reduce the negative pressures/overpressures used in conventional CCA impregnation and thereby to improve the cost-effectiveness of the process.
  • a tighter-grained type of wood, such as spruce can be pressure impregnated with the composition according to the invention, which has not been possible with conventionally used substances.
  • the penetrability of the composition according to the invention is good, and in some cases, mere immersion impregnation is also possible.
  • This method is simple but it requires separate immersion basins and is carried out in batch processes, like the pressure impregnation.
  • composition according to the invention can be sprayed onto the surface of wood, for example, in connection with the planing of sawn timber. In this way, pre- servation against microorganisms can be achieved during storage and delivery before a surface treatment (painting etc.) later on.
  • composition according to the invention may also be added into the wood in connection with a painting or another surface treatment line.
  • a wooden board can be impregnated with the solution under overpressure or negative pressure through a separate painting unit.
  • relatively good penetrability and thereby a reasonable resistance to weather and fire can be achieved by this method.
  • the borate content in the material is high enough.
  • concentration of about 7% (w/w) BAE in the wood is required for fire resistance.
  • concentration of about 7% (w/w) BAE in the wood is required for fire resistance.
  • concentration of about 7% (w/w) BAE in the wood is required for fire resistance.
  • BAE of trimethyl borate azeotrope is about 43%, so the solution may be diluted as long as the minimum required level in the material can still be obtained, for example said 7% for the protection against fire.
  • boric acid alcohol is formed as by-product.
  • Trialkyl borate or boric acid may react also with wood hydroxyl groups forming borate esters as described by Muhammed in Journal of Tropical Forest Science 21 (4): 345-352 (2009).
  • the most cost effective solution is methanol azeotrope of trimethyl borate in the above equation.
  • alkyl borate azeotrope is used as tall oil rosin dissolving compound to treat wood in an industrial way and the alcohol is evaporated to recycle it from the treatment. Conventional pressure treatment chambers can also be utilized.
  • ethyl borate azeotrope is used as tall oil rosin dissolving compound to treat wood in household applications. Evaporated ethanol is not toxic. Even painting of the solution on the surface of the wood would give high resistance to water and (micro)biological barrier for fungi or termites.
  • the wood is treated in outdoor/ambient atmosphere without any pre-treatment, which may be energy consuming methods, such as drying, e.g. kiln drying.
  • the treated wood may also be normalized at am- bient conditions.
  • the wood may be softwood or hardwood or even refractory wood.
  • Inventive solution has unique properties depending on the composition and treatment process. Since rosin is not soluble in methanol it will solidify when methyl borate is reacted with wood moisture. This allows wood loading with very high concentration of rosin. In case of ethanol or isopropanol less rosin is deposited in wood since it will easily flow back during kickback of the treatment. In this case boron concentration is high in relation to rosin.
  • wood is dual-treated with the inventive com- position and creosote.
  • This concept is reported in Norfolk Southern, RTA Showcase Long-Term Research, Crossties, March/April 2010, and the idea on 1987 was to partner creosote with a diffusible wood preservative containing boron in a dual-treatment process to extend and maximize the useful life of hardwood cross- ties in track. It was hypothesized that the borates would penetrate and protect the interior against wood-destroying organisms (decay, termites, etc.), while the traditional creosote treatment would weatherproof the outer portion of the treated product. The site was monitored for several years, and in 2002 several white oak ties were pulled for destructive testing.
  • the amount of creosote may be decreased to minimum and it can be applied only to surface treatment.
  • the boron-containing composition of the invention is well applicable to said dual-treatment method.
  • Examples 1 -4 relate to the preparation of preservative solution
  • Example 5 relates to preservative impregnation of wood
  • Example 6 relates to boron leaching from wood
  • Tall oil rosin (FOR85) was dissolved in triethyl borate and ethanol in different concentrations.
  • the rosin solubility in triethyl borate - ethanol is presented in Figure 2.
  • Tall oil rosin (FOR 85) was dissolved in triisopropyl borate and isopropanol in dif- ferent concentrations.
  • the rosin solubility in triisopropyl borate - isopropanol is presented in Figure 3.
  • Scots pine sawn boards of size 28 mm x 95 mm x 4000 mm were conditioned in moisture of 15% ⁇ 4% before treatment. Boards were placed in a treatment chamber which was then sealed. Treatment solution was allowed to flow to the chamber from upper storage vessel. Time recording for the impregnation started when suit- able amount of preservative was filled. At the end of the treatment all the liquid was drained out and after that vacuum was used to evaporate residual treatment solution and by-product methanol. Analysis of boron was done by ICP-AES and heartwood was excluded from analysis by procedure described in NWPC Document no. 3:1998. Rosin content was calculated from weigh differences.

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Abstract

L'invention concerne une composition de produit de préservation utilisée pour traiter des matériaux, cette composition contenant de la colophane dissoute dans un mélange de borate d'alkyle et d'alcool. Cette invention concerne également un procédé pour traiter des matériaux tels que du bois ou un matériau poreux différent du bois, par exemple du béton.
PCT/EP2011/058241 2010-05-21 2011-05-20 Composition de produit de préservation WO2011144729A2 (fr)

Priority Applications (2)

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AU2011254537A AU2011254537B2 (en) 2010-05-21 2011-05-20 Preservative composition
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FI20105562A (fi) 2011-11-22
AU2011254537B2 (en) 2013-03-28
AU2011254537A1 (en) 2012-07-05
CL2012002364A1 (es) 2013-02-08
WO2011144729A3 (fr) 2012-03-15
BR112012029235A2 (pt) 2015-10-20
FI20105562A0 (fi) 2010-05-21

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