WO2022261756A1 - Procédé de formation d'un produit en bois massif ignifuge - Google Patents

Procédé de formation d'un produit en bois massif ignifuge Download PDF

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Publication number
WO2022261756A1
WO2022261756A1 PCT/CA2022/050944 CA2022050944W WO2022261756A1 WO 2022261756 A1 WO2022261756 A1 WO 2022261756A1 CA 2022050944 W CA2022050944 W CA 2022050944W WO 2022261756 A1 WO2022261756 A1 WO 2022261756A1
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WO
WIPO (PCT)
Prior art keywords
product
fire retardant
solid wood
retardant resin
interior chamber
Prior art date
Application number
PCT/CA2022/050944
Other languages
English (en)
Inventor
Panagiotis N. MANOUDIS
Dimitra ASLANIDOU
Matthew Powell
Original Assignee
Zeroignition Technologies Inc.
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 Zeroignition Technologies Inc. filed Critical Zeroignition Technologies Inc.
Publication of WO2022261756A1 publication Critical patent/WO2022261756A1/fr

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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
    • B27K3/08—Impregnating by pressure, e.g. vacuum 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
    • 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
    • B27K3/0207—Pretreatment of wood before impregnation
    • B27K3/0221—Pore opening
    • 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
    • B27K3/0292—Processes; Apparatus involving an additional treatment during or after impregnation for improving fixation
    • 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
    • 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
    • C08L61/00—Compositions of condensation polymers of aldehydes or ketones; Compositions of derivatives of such polymers
    • C08L61/20—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen
    • C08L61/22—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with acyclic or carbocyclic compounds
    • C08L61/24—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with acyclic or carbocyclic compounds with urea or thiourea
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L61/00—Compositions of condensation polymers of aldehydes or ketones; Compositions of derivatives of such polymers
    • C08L61/20—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen
    • C08L61/30—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with heterocyclic and acyclic or carbocyclic compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N9/00—Arrangements for fireproofing
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K21/00—Fireproofing materials
    • C09K21/06—Organic materials
    • C09K21/10—Organic materials containing nitrogen

Definitions

  • aspects of the present disclosure are directed to method of forming a fire retardant solid wood product by pressure treating the solid wood product with a fire retardant product including a resin component.
  • a fire retardant treatment of a solid wood product is often a surface treatment with a fire retardant that may have limited penetration into the product. It may be even less likely for such a fire retardant surface treatment to achieve penetration into the product at the cellular level. Accordingly, such fire retardant surface treatment of solid wood products may have limited efficacy, particularly if the integrity of the treated surface layer of the solid wood product is compromised. Moreover, solid wood products receiving such a fire retardant surface treatment may be prone to having the fire retardant component(s) of the surface treatment leach out of the solid wood product, which may also adversely affect the efficacy of the fire retardant treatment.
  • Such a method comprises applying a first vacuum to an interior chamber of a pressure vessel having the solid wood product therein, and then directing a fire retardant resin product into the interior chamber after discontinuing the first vacuum application.
  • the fire retardant resin product is a liquid comprising between about 4% and about 12% total product weight of a phosphorous or nitrogen compound, between about 4% and about 12% total product weight of cyanoguanidine, between about 6% and about 14% total product weight of a urea formaldehyde resin, and between about 70% and about 78% total product weight of water.
  • a first positive pressure is then applied to the interior chamber having the solid wood product and the fire retardant resin product therein to direct the fire retardant resin product into the solid wood product.
  • Example Embodiment 1 A method of forming a fire retardant solid wood product, comprising applying a first vacuum to an interior chamber of a pressure vessel having the solid wood product therein; directing a fire retardant resin product into the interior chamber after discontinuing the first vacuum application, the fire retardant resin product being a liquid comprising between about 4% and about 12% total product weight of a phosphorous or nitrogen compound; between about 4% and about 12% total product weight of cyanoguanidine; between about 6% and about 14% total product weight of a urea formaldehyde resin; and between about 70% and about 78% total product weight of water; and applying a fust positive pressure to the interior chamber having the solid wood product and the fire retardant resin product therein to direct the fire retardant resin product into the solid wood product.
  • Example Embodiment 2 The method of any preceding example embodiment, or combinations thereof, comprising applying a second vacuum to the interior chamber after discontinuing the fust positive pressure and removing any excess fire retardant resin product therefrom.
  • Example Embodiment 3 The method of any preceding example embodiment, or combinations thereof, comprising, after discontinuing the first positive pressure, heating the interior chamber having the solid wood product therein to above an ambient temperature for a selected time period to cure the fire retardant resin product directed into the solid wood product, the cured fire retardant resin product reducing, minimizing, or preventing leaching of a fire retardant component of the fire retardant resin product from the solid wood product.
  • Example Embodiment 4 The method of any preceding example embodiment, or combinations thereof, comprising, after discontinuing the first positive pressure, heating the interior chamber having the solid wood product therein to a temperature of about 70°C or above for a time period of at least 10 hours to cure the fire retardant resin product directed into the solid wood product, the cured fire retardant resin product reducing, minimizing, or preventing leaching of a fire retardant component of the fire retardant resin product from the solid wood product.
  • Example Embodiment 5 The method of any preceding example embodiment, or combinations thereof, wherein directing the fire retardant resin product into the interior chamber comprises directing a combination of about 8% total product weight of the phosphorous or nitrogen compound; about 8% total product weight of cyanoguanidine; about 10% total product weight of the urea formaldehyde resin; and about 74% total product weight of water, into the interior chamber.
  • Example Embodiment 6 The method of any preceding example embodiment, or combinations thereof, comprising, before directing a fire retardant resin product into the interior chamber, directing a liquid, copper-containing wood preservative into the interior chamber after discontinuing the first vacuum application; applying a second positive pressure to the interior chamber having the solid wood product and the wood preservative therein to direct the wood preservative into the solid wood product; and applying a third vacuum to the interior chamber after discontinuing the second positive pressure and removing any excess wood preservative therefrom.
  • Example Embodiment 7 The method of any preceding example embodiment, or combinations thereof, comprising forming slits in the solid wood product prior to directing the solid wood product into the interior chamber.
  • Example Embodiment 8 The method of any preceding example embodiment, or combinations thereof, wherein applying the first positive pressure comprises applying a positive pressure cycle to the interior chamber having the solid wood product and the fire retardant resin product therein, the positive pressure cycle oscillating between a pressure minimum and a pressure maximum, the first positive pressure being the pressure maximum of the positive pressure cycle, to direct the fire retardant resin product into the solid wood product.
  • Example Embodiment 9 The method of any preceding example embodiment, or combinations thereof, comprising forming the fire retardant resin product, prior to directing the fire retardant resin product into the interior chamber, by adding between about 4% and about 12% total product weight of a phosphorous or nitrogen compound to between about 70% and about 78% total product weight of water to form a fust mixture, while agitating the first mixture; adding between about 4% and about 12% total product weight of cyanoguanidine to the first mixture to form a second mixture, while agitating the second mixture and dissolving the cyanoguanidine; and adding between about 6% and about 14% total product weight of a urea formaldehyde resin to the second mixture to form the fire retardant resin product, while agitating the fire retardant resin product.
  • Example Embodiment 10 The method of any preceding example embodiment, or combinations thereof, wherein adding the phosphorous or nitrogen compound comprises adding about 8% total product weight of the phosphorous or nitrogen compound to about 74% total product weight of water.
  • Example Embodiment 11 The method of any preceding example embodiment, or combinations thereof, wherein adding the phosphorous or nitrogen compound comprises adding between about 4% and about 12% total product weight of an 85% phosphoric acid solution.
  • Example Embodiment 12 The method of any preceding example embodiment, or combinations thereof, wherein adding cyanoguanidine comprises adding about 10% total product weight of cyanoguanidine.
  • Example Embodiment 13 The method of any preceding example embodiment, or combinations thereof, wherein dissolving the cyanoguanidine comprises heating the second mixture at a temperature of greater than about 45 °C until the cyanoguanidine is dissolved and the second mixture is a clear solution.
  • Example Embodiment 14 The method of any preceding example embodiment, or combinations thereof, wherein dissolving the cyanoguanidine comprises agitating the second mixture at room temperature using a high shear mixer device.
  • Example Embodiment 15 The method of any preceding example embodiment, or combinations thereof, wherein adding the urea formaldehyde resin comprises adding about 10% total product weight of the urea formaldehyde resin.
  • Example Embodiment 16 The method of any preceding example embodiment, or combinations thereof, wherein adding the urea formaldehyde resin comprises adding a melamine urea formaldehyde resin.
  • Example Embodiment 17 The method of any preceding example embodiment, or combinations thereof, comprising varying a melamine content to change a material characteristic of the melamine urea formaldehyde resin.
  • Example Embodiment 18 The method of any preceding example embodiment, or combinations thereof, comprising varying a formaldehyde to urea ratio of the urea formaldehyde resin, or varying a % solids content within the urea formaldehyde resin, to change a material characteristic of the urea formaldehyde resin.
  • FIG. 1 schematically illustrates a pressure vessel implemented in a pressure treatment process for wood products, with certain wood products disposed in the interior chamber thereof and air being evacuated from the interior chamber by an applied vacuum
  • FIG. 2 schematically illustrates a fire retardant resin product being directed into a solid wood product by the application of a positive pressure to the interior chamber of the pressure vessel having the solid wood product and the fire retardant resin product therein, according to one aspect of the present disclosure
  • FIG. 3 schematically illustrates the evacuation of the interior chamber of the pressure vessel following the pressure treatment of the solid wood product
  • FIG. 4 schematically illustrates a flowchart associated with a method for forming a fire retardant resin product, according to one aspect of the present disclosure
  • FIG. 5 schematically illustrates a flowchart associated a process for forming a fire retardant solid wood product using the fire retardant resin product, according to one aspect of the present disclosure.
  • aspects of the present disclosure are directed to a method or process for forming a fire- resistant solid wood product which, in one aspect, is performed with a pressure treatment system for wood products, generally indicated by element 100 in FIG. 1.
  • a pressure treatment system for wood products generally indicated by element 100 in FIG. 1.
  • pressure treatment process for the preservation of solid wood e.g., timber, lumber, plywood
  • full-ceH or Bethell process.
  • the solid wood product 200 to be treated is loaded on tram cars, which are run into the interior chamber 400 of a large steel cylinder or pressure vessel 300.
  • a wood treatment material or substance is admitted into the pressure vessel 300 and a positive pressure is applied to the interior chamber 400 of the pressure vessel 300 until the required absorption of the wood treatment material into the wood product 200 has been obtained/achieved.
  • the method comprises applying a first vacuum to an interior chamber 400 of a pressure vessel 300 having the solid wood product 200 therein (Block 400 in FIG. 4), for example, to remove as much air as practicable from the wood cells of the solid wood product 200.
  • a fire retardant resin product 450 (see, e.g., FIG. 2) is then directed into the interior chamber 400 after discontinuing the first vacuum application (Block 440 in FIG. 4), in particular instances without admitting air back into the interior chamber 400.
  • the fire retardant resin product is a liquid comprising between about 4% and about 12% total product weight of a phosphorous or nitrogen compound, between about 4% and about 12% total product weight of cyanoguanidine, between about 6% and about 14% total product weight of a urea formaldehyde resin, and between about 70% and about 78% total product weight of water.
  • the fire retardant resin product 450 directed into the interior chamber 400 comprises a combination of about 8% total product weight of the phosphorous or nitrogen compound, about 8% total product weight of cyanoguanidine, about 10% total product weight of the urea formaldehyde resin, and about 74% total product weight of water.
  • FIG. 4 After the interior chamber 400 of the pressure vessel 300 is filled with the fire retardant resin product 450, a positive pressure is applied to the interior chamber 400 having the solid wood product 200 and the fire retardant resin product 450 therein, to direct the fire retardant resin product 450 into the solid wood product 200 (Block 480 in FIG. 4), until the required absorption of the fire retardant resin product 450 is obtained/attained (see, e.g., FIG. 2).
  • FIG. 2 further schematically illustrates the progression of the absorption of the fire retardant resin product (see, e.g., element 250 A) over a cross- section of the solid wood product 200 in response to the applied positive pressure, in contrast to the portion of the cross-section that has not yet absorbed the fire retardant resin product (see, e.g., element 250B).
  • the method comprises applying a second vacuum to the interior chamber 400, after discontinuing the first positive pressure and removing any excess fire retardant resin product 450 from the interior chamber 400 (see, e.g., FIG. 3), for example to remove any excess amounts of the fire retardant resin product 450 (e.g., pools or droplets thereof) remaining on the treated solid wood product 200.
  • the method includes heating the interior chamber 400 having the treated solid wood product 200 therein, to above an ambient temperature and for a selected time period, in order to cure or at least partially cure the fire retardant resin product 450 directed into and remaining in the treated solid wood product 200.
  • the cured fire retardant resin product may, in some instances, reduce, minimize, or prevent leaching of one or more fire retardant components of the fire retardant resin product from the treated solid wood product 200.
  • the interior chamber 400 having the treated solid wood product 200 therein is heated to a temperature of about 70°C or above for a time period of at least 10 hours to cure the fire retardant resin product in the solid wood product.
  • the curing process implementing heat and time can be varied as necessary or desired to achieve suitable curing of the fire retardant resin product. For example, a relatively higher curing temperature may require less time to cure the fire retardant resin product, while a relatively lower curing temperature may require more time to cure the fire retardant resin product.
  • the solid wood product 200 can first be treated with conventional preservative materials or substances such as, for example, a liquid, copper- containing wood preservative (e.g., ACQ, or alkaline copper quat; ACC or acid copper chromate;
  • a liquid, copper- containing wood preservative e.g., ACQ, or alkaline copper quat; ACC or acid copper chromate;
  • CC or ammoniacal copper citrate; and CBA or CA-B copper azole are arsenic-free wood treatments).
  • Such a process involves, for example, directing a liquid, copper-containing wood preservative into the interior chamber after discontinuing the first vacuum application; applying a second positive pressure to the interior chamber having the solid wood product and the wood preservative therein to direct the wood preservative into the solid wood product; and applying a third vacuum to the interior chamber after discontinuing the second positive pressure and removing any excess wood preservative therefrom.
  • the interior chamber can then be fdled with the fire retardant resin product, as otherwise disclosed herein, to infuse the fire retardant resin product into the solid wood product 200.
  • the fire retardant resin product once cured, can serve to contain the wood preservative within the interior of the solid wood product, and therefore also reduce, minimize, or prevent leaching of one or more components (e.g., copper) of the wood preservative from the solid wood product.
  • one or more components e.g., copper
  • the pressure treatment process can be modified as necessary or desired in order, for example, to enhance the absorption of the wood preservative and/or the fire retardant resin product by the solid wood product 200.
  • one or more slits are formed in the solid wood product (e.g., in any external surface thereof) prior to directing the solid wood product 200 into the interior chamber 400.
  • the first positive pressure applied in connection with the fire retardant resin product in the interior chamber and or the second positive pressure applied in connection with the optional wood preservative in the interior chamber can be a pulsed or cycled pressure application, with the first and/or second positive pressure being the maximum positive pressure applied in the pulse or cycle.
  • a positive pressure cycle applied to the interior chamber can oscillate between a pressure minimum (equal to or greater than ambient pressure) and a pressure maximum, with the first positive pressure being the pressure maximum of the positive pressure cycle.
  • FIG. 5 schematically illustrates a flowchart associated with a method or step for forming a fire retardant resin product, according to one aspect of the present disclosure, which can be an additional step in the disclosed method of forming a fire retardant solid wood product as disclosed herein.
  • a method or step of forming a fire retardant resin product comprises, for example, adding between about 4% and about 12% total product weight of a phosphorous or nitrogen compound to between about 70% and about 78% total product weight of water to form a first mixture, while agitating the first mixture (Block 500).
  • the phosphorous compound or nitrogen compound comprises, for example, phosphoric acid and, in particular instances, an 85% phosphoric acid solution.
  • a phosphorous or nitrogen compound such as an 85% phosphoric acid solution
  • a stirring apparatus e.g., an overhead stirrer such as an IKA Nanostar 7.5 stirrer equipped with a 4-bladed propeller as the stirrer
  • the mixture is stirred and mixed for about 10 minutes, with the stirring apparatus being operated at about 400 rpm.
  • Cyanoguanidine may otherwise be referred to herein or known, for example, as dicyandiamide, dicyanodiamide, or 1 -cyanoguanidine.
  • about 10% total product weight of the cyanoguanidine is added to the first mixture to form the second mixture.
  • the cyanoguanidine is gradually added to the first mixture, which continues to be stirred/agitated.
  • the second mixture can be heated at an elevated temperature (e.g., >45°C) until the cyanoguanidine is fully dissolved (e.g., 1-2 hrs).
  • the second mixture can be processed at ambient temperature (e.g., room temperature) using a high shear mixing device (e.g., mixer or stirrer) for, e.g., 18-24 hrs at 500 rpm).
  • a high shear mixing device e.g., mixer or stirrer
  • the cyanoguanidine will substantially completely dissolve and result in the second mixture being a clear solution.
  • adding the urea formaldehyde resin comprises adding about 10% total product weight of the urea formaldehyde resin to the second mixture.
  • the urea formaldehyde resin comprises, for example, a melamine urea formaldehyde resin.
  • the composition of the melamine urea formaldehyde resin is proportional to the material properties exhibited by the resin.
  • the melamine content of the resin can be varied to change a material characteristic of the melamine urea formaldehyde resin.
  • a formaldehyde to urea ratio of the urea formaldehyde resin can be varied, or a % solids content within the urea formaldehyde resin can be varied, to change a material characteristic of the urea formaldehyde resin.
  • cyanoguanidine 80 gr is gradually added to the mixture during stirring. There are two ways to dissolve the cyanoguanidine: 1) Heat the mixture at >45°C until the cyanoguanidine is fully dissolved (1-2 hr); or 2) Process the mixture at room temperature using a high shear mixer for 18-24 hr at 500rpm. In either case, the cyanoguanidine is dissolved in the mixture and the result is the mixture in the form of a clear solution. 3. 100 gr of MUF resin is gradually added to the mixture during stirring and further mixed for
  • the resulting fire retardant resin product comprises between about 4% and about 12% total product weight of a phosphorous or nitrogen compound; between about 4% and about 12% total product weight of cyanoguanidine; between about 6% and about 14% total product weight of a urea formaldehyde resin; and between about 70% and about 78% total product weight of water.
  • the fire retardant resin product comprises about 8% total product weight of the phosphorous or nitrogen compound; about 8% total product weight of cyanoguanidine; about 10% total product weight of the urea formaldehyde resin; and about 74% total product weight of water.
  • the phosphorous compound or nitrogen compound comprises, for example, an 85% phosphoric acid solution
  • the urea formaldehyde resin comprises, for example, a melamine urea formaldehyde resin.
  • the final fire retardant resin product exhibits, for example, is a relatively low pH (e.g., pH 1.6-1.8 after blending).
  • this liquid may exhibit some changes over time.
  • colloidal particles may be formed, followed by clustering of those colloidal particles.
  • the MUF resin components may change from a clear liquid to a colloidal dispersion, wherein the colloidal particles of the MUF resin remain relatively evenly distributed in the final composition, without significant settling out.
  • the dicyandiamide may slowly react, separately, with the phosphoric acid and the components of the MUF resin, which may be manifest in a slow increase of the pH value of the final composition (e.g., after 6 months of storage the pH may be >3.5).
  • the colloidal particles/clusters may settle, though the composition can be re-homogenized by agitation (e.g., shaking the container) following extended storage.
  • the resin product forms a mixture having lower risk of premature curing (e.g., the fire retardant component does not act as a catalyst for the urea formaldehyde resin), as well as a lower risk of the fire retardant component reacting with free formaldehyde from the urea formaldehyde resin.
  • first, second, etc. may be used herein to describe various steps or calculations, these steps or calculations should not be limited by these terms. These terms are only used to distinguish one operation or calculation from another. For example, a first calculation may be termed a second calculation, and, similarly, a second step may be termed a first step, without departing from the scope of this disclosure.
  • the term “and/or” and the “/” symbol includes any and all combinations of one or more of the associated listed items.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)

Abstract

L'invention concerne un procédé de traitement sous pression d'un produit en bois massif, consistant à appliquer un premier vide à une chambre intérieure d'une cuve sous pression contenant le produit en bois massif, et à diriger un produit à base de résine ignifuge dans la chambre intérieure après interruption de l'application du premier vide. Le produit à base de résine ignifuge est un liquide comprenant entre environ 4 % et environ 12 % en poids du produit total d'un composé de phosphore ou d'azote, entre environ 4 % et environ 12 % en poids du produit total de cyanoguanidine, entre environ 6 % et environ 14 % en poids du produit total d'une résine urée-formaldéhyde, et entre environ 70 % et environ 78 % en poids du produit total d'eau. Le procédé consiste en outre à appliquer une première pression positive à la chambre intérieure contenant le produit en bois massif et le produit à base de résine ignifuge pour diriger le produit à base de résine ignifuge dans le produit en bois massif.
PCT/CA2022/050944 2021-06-14 2022-06-14 Procédé de formation d'un produit en bois massif ignifuge WO2022261756A1 (fr)

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