EP3288732A1 - Improving fire retardant properties of wood - Google Patents
Improving fire retardant properties of woodInfo
- Publication number
- EP3288732A1 EP3288732A1 EP16706877.4A EP16706877A EP3288732A1 EP 3288732 A1 EP3288732 A1 EP 3288732A1 EP 16706877 A EP16706877 A EP 16706877A EP 3288732 A1 EP3288732 A1 EP 3288732A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- wood
- coating formulation
- coating
- polymer material
- major surface
- 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.)
- Withdrawn
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
-
- 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
- B27K3/0214—Drying
-
- 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
- B27K3/163—Compounds of boron
-
- 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
- B27K3/166—Compounds of phosphorus
-
- 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
- B27K3/20—Compounds of alkali metals or ammonium
-
- 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
- B27K3/32—Mixtures of different inorganic impregnating agents
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/06—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to wood
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27K—PROCESSES, APPARATUS OR SELECTION OF SUBSTANCES FOR IMPREGNATING, STAINING, DYEING, BLEACHING OF WOOD OR SIMILAR MATERIALS, OR TREATING OF WOOD OR SIMILAR MATERIALS WITH PERMEANT LIQUIDS, NOT OTHERWISE PROVIDED FOR; CHEMICAL OR PHYSICAL TREATMENT OF CORK, CANE, REED, STRAW OR SIMILAR MATERIALS
- B27K2240/00—Purpose of the treatment
- B27K2240/30—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
- C09K21/02—Inorganic materials
- C09K21/04—Inorganic materials containing phosphorus
Definitions
- the adjuvant may comprise one or more of: a glycol, a hydrotrope, and a surfactant.
- a glycol e.g., a glycol
- hydrotrope e.g., a hydrotrope
- surfactant e.g., a surfactant for aqueous solutions.
- hydrotropes consist of a hydrophilic part and a hydrophobic part (like surfactants) but the hydrophobic part is generally too small to cause spontaneous self-aggregation
- Solution 1 containing boric acid and diammoniunn phosphate was prepared follows.
- a first coating formulation was prepared by mixing Solution 1 and Solution 2 in a 95:5 volume ratio (1 16.7:4.85 weight ratio). Moderate agitation was maintained throughout the process to prevent phase separation.
- Example 1 The first coating formulation was spray coated onto a substrate of Wisa Finnish Spruce Plywood 2440 mm x 1220 mm (8' x 4') 18 mm thick, 7 veneer, under the conditions summarised in Table 1 .
- Ambient temperature and relative humidity may require the specifications to be changed. Increase / modify the combination dryer as necessary to yield a dry wood at the end.
- Randomised wood moisture content must be no more than 20% measured using a wood moisture meter. If necessary, the wood is dried to a moisture content of no more than 20%, preferably about 15%.
- the same process is repeated for the second pass, with measured moisture content of the wood being no more than 20%, preferably about 15%, prior to the second coating pass.
- the panel is rotated, and Surface 2 is treated with the same two-pass coating process as was done for Surface 1 .
- each coating pass applies the first coating formulation at a rate of about 260 g/m 2 .
- the second coating formulation is applied to each major surface of the wood, in this example using the process conditions summarised in Table 2. It is important to control the moisture content, because we have found that high surface moisture hinders the MicroBarrier from adhering to the surface. With too high a moisture content prior to coating, the MicroBarrier may flake off after drying. Machine specifications:
- Weight increase of 2440 mm x 1220 mm (8' x 4') board is 297.3 g / board ⁇ 14.9 grams;
- styrene-butadiene copolymers as the MicroBarrier provide an optimum performance compared to all other options.
- Polyacrylate adhesives for example can impart the binding and durability properties required; however the wood panels will be glued together and prevent use.
- Polyurethanes could also be used; however this was not a viable option for the methods of use of the present examples.
- Styrene-Butadiene copolymers can have a range of properties depending on the ratio of styrene to butadiene monomers, as well as whether the product is post- modified.
- the grade chosen provides a non-tacky finish, hydrophobic finish and good adhesion into the wood, without increasing smoke output. It also did not cause flaming droplets, something that foaming MicroBarriers such as
- polyurethane could have caused.
- Titanium dioxide albeit in small quantities, provides UV protection and prevents the long term photolysis of the styrene-butadiene copolymer.
- Styrene-butadiene is a very large chromophore, conjugated or not depending on the molecular construct, and some protection against UV damage is desirable.
- Boron will react with hydroxyl (-OH) functional groups of cellulose in wood.
- the chemical reaction endothermic
- Boron (as boric or borate species) will also catalyse the dehydration of wood, catalysing the char formation if synergistic substances (e.g phosphate, PO 4 3" ) are present.
- Phosphate species e.g. ammonium phosphate
- Ammonium phosphate will also release ammonia gas (see below).
- the phosphoric acid will extract water from the pyrolysing substrate, causing char build-up.
- This mechanism is a combination of dehydration of cellulose (-OH groups) by forming ester bonds, similar to boron, decomposition and release of char (i.e. carbon material).
- Phosphate-based fire retardants act directly in the pyrolysing stage of fire, reducing the available flammable gas to continue propagation and forming a protective char layer.
- Non-factory production FR 'systems' such as intumescent paints are able to claim FR efficacy but these coatings are applied after the boards have been used within the build environment over which there is far less control in the application and the actual classification offered is usually flawed by this.
- Durability Durability is determined by TS 15912:2012 - Durability of reaction to fire performance - Classes of fire-retardant wood-based product in interior and exterior end use applications. This standard is due to be adopted as EN16755 after a public consultation period has been completed. Wood treated according to the present invention has been tested and demonstrated INT2 Durability: for permanent use in interior applications and certain protected exterior applications, service class 2 (eg wall and ceiling products).
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1507324.0A GB2538060B (en) | 2015-04-29 | 2015-04-29 | Improving fire retardant properties of wood |
PCT/EP2016/054230 WO2016173743A1 (en) | 2015-04-29 | 2016-02-29 | Improving fire retardant properties of wood |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3288732A1 true EP3288732A1 (en) | 2018-03-07 |
Family
ID=53488870
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16706877.4A Withdrawn EP3288732A1 (en) | 2015-04-29 | 2016-02-29 | Improving fire retardant properties of wood |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3288732A1 (en) |
GB (1) | GB2538060B (en) |
WO (1) | WO2016173743A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11130256B2 (en) * | 2017-04-10 | 2021-09-28 | University Of Maryland, College Park | Strong and tough structural wood materials, and methods for fabricating and use thereof |
CA3064019A1 (en) * | 2017-05-31 | 2018-12-06 | Armstrong World Industries, Inc. | Flame retardant clear coatings for building panels |
US11015081B2 (en) | 2018-08-22 | 2021-05-25 | Polymer Solutions Group | Fine particle size boric acid/urea dispersion, method of use in engineered wood product manufacture, method of coating wood products and product therefrom |
IT201900012156A1 (en) | 2019-07-17 | 2021-01-17 | Sherwin Williams Italy S R L | Flame retardant crosslinkable coating composition |
CN114800756A (en) * | 2022-05-12 | 2022-07-29 | 潘春娟 | Flame-retardant mildew-proof composite floor and preparation method thereof |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE789815A (en) * | 1970-03-27 | 1973-04-06 | Stauffer Chemical Co | VINYLPHOSPHONATES COPOLYCONDENSES AND THEIR USE AS INFLAMMATION-DELAYING AGENTS |
US4153466A (en) * | 1977-10-25 | 1979-05-08 | The Dow Chemical Company | Compositions comprising phosphate salts of poly-2-oxazoline and fire retardant formulations |
CA2083375C (en) * | 1991-04-04 | 2004-06-22 | Satoshi Fujiki | Wood processing composition, processed wood and a method of processing wood |
NZ244803A (en) * | 1993-01-13 | 1996-01-26 | Nz Forest Research Inst Ltd | Timber preservation process comprising drying the timber, then contacting with a liquid reactive boron compound |
US20050217537A1 (en) * | 2004-03-09 | 2005-10-06 | Knipe Eric V | Formulations and methods for rendering materials flame retardant and resistant to molds and insects |
JP2005271309A (en) * | 2004-03-23 | 2005-10-06 | Gunma Prefecture | Flameproofing-treated wood and its production method |
-
2015
- 2015-04-29 GB GB1507324.0A patent/GB2538060B/en active Active
-
2016
- 2016-02-29 EP EP16706877.4A patent/EP3288732A1/en not_active Withdrawn
- 2016-02-29 WO PCT/EP2016/054230 patent/WO2016173743A1/en active Application Filing
Also Published As
Publication number | Publication date |
---|---|
WO2016173743A1 (en) | 2016-11-03 |
GB2538060A (en) | 2016-11-09 |
GB201507324D0 (en) | 2015-06-10 |
GB2538060B (en) | 2017-04-19 |
GB2538060A8 (en) | 2016-11-30 |
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