CA2520331A1 - Method for manufacturing woody materials for construction use - Google Patents
Method for manufacturing woody materials for construction use Download PDFInfo
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- CA2520331A1 CA2520331A1 CA 2520331 CA2520331A CA2520331A1 CA 2520331 A1 CA2520331 A1 CA 2520331A1 CA 2520331 CA2520331 CA 2520331 CA 2520331 A CA2520331 A CA 2520331A CA 2520331 A1 CA2520331 A1 CA 2520331A1
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- flame retardant
- wooden material
- impregnated
- wooden
- drying
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- 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
- C09K21/12—Organic materials containing phosphorus
Abstract
According to an aspect of the present invention there is provided a method for manufacturing a woody material for construction use, the method comprising the steps of: a) removing beforehand moisture, oil and fat contained in a wooden material, and securing voids in the wooden material, b) impregnating the wooden material sufficiently with a flame retardant prepared in such a manner that an aqueous solution of condensate of phosphoric acid and urea is pH
adjusted by adding ammonia water, ammonium borate and ammonium sulfamate, c) repeating thereafter depressurization treatment and pressurization treatment a plurality of times in room temperature or high-temperature atmosphere to obtain an impregnated wooden material which is impregnated with the flame retardant 100% to 250%, d) drying thereafter the impregnated wooden material to obtain a flame retardant woody material, and e) after drying, coating or spraying a mixture of alcohol and nondrying solvent onto the surface of the flame retardant woody material.
adjusted by adding ammonia water, ammonium borate and ammonium sulfamate, c) repeating thereafter depressurization treatment and pressurization treatment a plurality of times in room temperature or high-temperature atmosphere to obtain an impregnated wooden material which is impregnated with the flame retardant 100% to 250%, d) drying thereafter the impregnated wooden material to obtain a flame retardant woody material, and e) after drying, coating or spraying a mixture of alcohol and nondrying solvent onto the surface of the flame retardant woody material.
Description
METHOD FOR MANUFACTURING WOODY MATERIALS FOR CONSTRUCTION USE
BACKGROUND OF THE INVENTION
Field of the Invention The present invention relates to woody materials for construction used in buildings or the like impregnated with flame retardant to which surface treatment is provided so that the impregnant may not appear on the surface after treatment.
Related Background Art Architectural structures require security against both natural disasters such as earthquake, wind, rain, snow, thunderstorm or the like and artificial disasters such as fire or human break-in. Architectural structures also require livability to offer amenity and efficiency with regard to water, sound, light, heat, shape, color, type of usage or type of behavior, etc.
Furthermore, architectural structures require durability to keep security and livability for the prescribed period of time.
Among others, the security against fire is strongly required for wooden buildings or buildings partly made of wooden materials. Security of building components includes such finishing materials that are hard to ignite by the heat from origin of fire at an initial stage of fire breakout and that may prevent the fire from spreading in a case of ignition. Such structural members that may prevent the fire from spreading are also required. Emission of smoke and poisonous fumes from finishing materials or structural members shall be kept minimal.
If a fire occurs, it is quite important to prevent the fire from spreading at an initial stage.
Fire prevention and disaster prevention standards are specified in the Building Standard Law (a Japanese law), and the prescribed standards for fireproof materials and incombustible materials are also specified.
To satisfy fire prevention and disaster prevention standards specified in the Building Standard Law, the wooden materials shall be subjected to test items shown below.
Table 1 Tune of fireproof materials and test items Test Surface Base Drilling Gas toxicModel test box item material test propertiestest Type test Fireproof O O
materials Semi-fireproofO O O O
materials Incombustible O O
materials Semi-incombusti ~ O
ble materials Table 2 Surface test standard for incombustible materials and semi~firenroof materials Surface 'Pemperature Flaming coefficientAfterflameHeating test time (CA) time (sec.)time (min.) area (td 8 ) Semi-fireproof s 100 s 60 s 30 10 material Incombustible materials ~ 3b0 <_ 120 5 30 6 In the standards, incombustible materials are described as ones having good performances comparable with those of fireproof materials and semi-incombustible materials. Incombustible materials cause less combustion phenomena at an initial stage of a fire, generate a smaller quantity of smoke that hinders evacuation activities and have no damage detrimental to fire prevention.
In particular, a cemented excelsior board, a gypsum board, metal siding or the like which are composed of raw materials containing a small amount of wood, paper, plastics, etc. are specified as incombustible materials for construction use.
Incombustible materials are specified as being composed of incombustible plywood, incombustible fiber boards, incombustible plastics or the like.
On the other hand, adhesives, binders, films or the like used for producing the above materials contain formalin resin or chlorine resin which result in generation of toxic substances such as formalin gas or dioxin or the like in the case of combustion.
It has been extremely difficult to convert wooden materials into incombustible materials category due to various factors.
According to the prior art, it is impossible to obtain incombustible materials in which raw material features of original wood remain as they were before conversion.
A prior art document relating to the field is Japanese Patent Laid-open Application No. 1994-247815.
SUMMARY OF THE INVENTION
Problems to be solved by the Invention The present invention aims to improve fireproof features or incombustible features of woody materials by impregnation with a flame retardant and to prevent the blushing phenomenon which may occur on the surface of woody materials from the flame retardant.
Means for Solving the Problems To achieve these aims, the present invention involves any of the following materials as a flame retardant:
A flame retardant prepared in such a manner that aqueous solution of condensate of phosphoric acid and urea is pH adjusted by ammonia water and ammonium borate and ammonium sulfamate are added;
a flame retardant prepared in such a manner that aqueous solution of~condensate of phosphoric acid and urea is pH adjusted by ammonia water, and ammonium borate, ammonium sulfamate, and ammonium bromide are added;
a flame retardant prepared in such a manner that mixed aqueous solution of guanidine phosphate and guanidine sulfamate is pH adjusted by phosphoric acid and ammonia water, and boric acid compound system flame retardant is mixed;
a flame retardant prepared by mixing mixed aqueous solution of condensed carbamate phosphate and amide sulfonate, and boric acid compound system flame retardant; a flame retardant prepared in such a manner that mixed aqueous solution of ammonium pentaborate, condensed carbamate phosphate, and ammonium sulfamate is adjusted to contain 30% or more solid content;
a flame retardant prepared in such a manner that mixed aqueous solution of ammonium pentaborate, condensed carbamate phosphate, ammonium sulfamate, and ammonium bromide is adjusted to have 30% or more solid content; and a flame retardant prepared in such a manner that boric acid is dissolved in ammonia water, and condensed carbamate phosphate, ammonium sulfamate, and ammonium bromide are added and dissolved thoroughly, and is adjusted to contain 30% or more solid content.
The woody material is impregnated with any of above-mentioned flame retardants to produce the woody material for construction use. A manufacturing method comprises the steps of:
1. Moisture, oil and fat contained in wooden material are removed to secure sufficient voids in a wooden material member;
2. the wooden material is impregnated sufficiently with any of above-mentioned flame retardants;
3. Following that, depressurization and pressurization process are repeated for several times in room temperature or high-temperature atmosphere to obtain wooden material in which flame retardant is impregnated 100% to 250%;
BACKGROUND OF THE INVENTION
Field of the Invention The present invention relates to woody materials for construction used in buildings or the like impregnated with flame retardant to which surface treatment is provided so that the impregnant may not appear on the surface after treatment.
Related Background Art Architectural structures require security against both natural disasters such as earthquake, wind, rain, snow, thunderstorm or the like and artificial disasters such as fire or human break-in. Architectural structures also require livability to offer amenity and efficiency with regard to water, sound, light, heat, shape, color, type of usage or type of behavior, etc.
Furthermore, architectural structures require durability to keep security and livability for the prescribed period of time.
Among others, the security against fire is strongly required for wooden buildings or buildings partly made of wooden materials. Security of building components includes such finishing materials that are hard to ignite by the heat from origin of fire at an initial stage of fire breakout and that may prevent the fire from spreading in a case of ignition. Such structural members that may prevent the fire from spreading are also required. Emission of smoke and poisonous fumes from finishing materials or structural members shall be kept minimal.
If a fire occurs, it is quite important to prevent the fire from spreading at an initial stage.
Fire prevention and disaster prevention standards are specified in the Building Standard Law (a Japanese law), and the prescribed standards for fireproof materials and incombustible materials are also specified.
To satisfy fire prevention and disaster prevention standards specified in the Building Standard Law, the wooden materials shall be subjected to test items shown below.
Table 1 Tune of fireproof materials and test items Test Surface Base Drilling Gas toxicModel test box item material test propertiestest Type test Fireproof O O
materials Semi-fireproofO O O O
materials Incombustible O O
materials Semi-incombusti ~ O
ble materials Table 2 Surface test standard for incombustible materials and semi~firenroof materials Surface 'Pemperature Flaming coefficientAfterflameHeating test time (CA) time (sec.)time (min.) area (td 8 ) Semi-fireproof s 100 s 60 s 30 10 material Incombustible materials ~ 3b0 <_ 120 5 30 6 In the standards, incombustible materials are described as ones having good performances comparable with those of fireproof materials and semi-incombustible materials. Incombustible materials cause less combustion phenomena at an initial stage of a fire, generate a smaller quantity of smoke that hinders evacuation activities and have no damage detrimental to fire prevention.
In particular, a cemented excelsior board, a gypsum board, metal siding or the like which are composed of raw materials containing a small amount of wood, paper, plastics, etc. are specified as incombustible materials for construction use.
Incombustible materials are specified as being composed of incombustible plywood, incombustible fiber boards, incombustible plastics or the like.
On the other hand, adhesives, binders, films or the like used for producing the above materials contain formalin resin or chlorine resin which result in generation of toxic substances such as formalin gas or dioxin or the like in the case of combustion.
It has been extremely difficult to convert wooden materials into incombustible materials category due to various factors.
According to the prior art, it is impossible to obtain incombustible materials in which raw material features of original wood remain as they were before conversion.
A prior art document relating to the field is Japanese Patent Laid-open Application No. 1994-247815.
SUMMARY OF THE INVENTION
Problems to be solved by the Invention The present invention aims to improve fireproof features or incombustible features of woody materials by impregnation with a flame retardant and to prevent the blushing phenomenon which may occur on the surface of woody materials from the flame retardant.
Means for Solving the Problems To achieve these aims, the present invention involves any of the following materials as a flame retardant:
A flame retardant prepared in such a manner that aqueous solution of condensate of phosphoric acid and urea is pH adjusted by ammonia water and ammonium borate and ammonium sulfamate are added;
a flame retardant prepared in such a manner that aqueous solution of~condensate of phosphoric acid and urea is pH adjusted by ammonia water, and ammonium borate, ammonium sulfamate, and ammonium bromide are added;
a flame retardant prepared in such a manner that mixed aqueous solution of guanidine phosphate and guanidine sulfamate is pH adjusted by phosphoric acid and ammonia water, and boric acid compound system flame retardant is mixed;
a flame retardant prepared by mixing mixed aqueous solution of condensed carbamate phosphate and amide sulfonate, and boric acid compound system flame retardant; a flame retardant prepared in such a manner that mixed aqueous solution of ammonium pentaborate, condensed carbamate phosphate, and ammonium sulfamate is adjusted to contain 30% or more solid content;
a flame retardant prepared in such a manner that mixed aqueous solution of ammonium pentaborate, condensed carbamate phosphate, ammonium sulfamate, and ammonium bromide is adjusted to have 30% or more solid content; and a flame retardant prepared in such a manner that boric acid is dissolved in ammonia water, and condensed carbamate phosphate, ammonium sulfamate, and ammonium bromide are added and dissolved thoroughly, and is adjusted to contain 30% or more solid content.
The woody material is impregnated with any of above-mentioned flame retardants to produce the woody material for construction use. A manufacturing method comprises the steps of:
1. Moisture, oil and fat contained in wooden material are removed to secure sufficient voids in a wooden material member;
2. the wooden material is impregnated sufficiently with any of above-mentioned flame retardants;
3. Following that, depressurization and pressurization process are repeated for several times in room temperature or high-temperature atmosphere to obtain wooden material in which flame retardant is impregnated 100% to 250%;
4. It is then dried in appropriate temperatures for appropriate time to obtain flame retardant woody material; and 5. After drying, a mixture of alcohol and nondrying solvent is coated or sprayed onto the surface of the flame retardant woody material.
Technical Advantage of the Invention The present invention has realized incombustible members which meet incombustible material standard for woody materials by using aqueous solution in which phosphoric acid compound, sulfamate compound, and boric acid compound are mixed in well-balanced state.
In particular, mixing of sulfamate compound resulting in generation of nitrogen gas due to increased temperature at fire breakout and in suppression of afterflame and furthermore, adoption of ammonium bromide improves incombustible features of wooden materials.
If no additional treatments are given, blushing phenomena occur on the surface of the woody material, and white powders of the above-mentioned flame retardant appear on the surface three months or more after treatment.
With the present invention, a material including a mixture of alcohol and nondrying solvent is coated or sprayed onto the surface of the woody material being converted to incombustible quality, and the above-mentioned flame retardant is locked into the member and generation of white powders on the surface is suppressed.
Furthermore, the surface treatment enables reduction in moisture absorbent from the surface of woody material, prevention of decomposition and decay of the material concerned is made possible thereby resulting in long time usage of woody material.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 shows a measurement curve of a test body;
Fig. 2 shows a measurement curve of another test body; and Fig. 3 shows a measurement curve of another test body.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring to embodiments 1 to 6, a process of impregnating of woody material with a flame retardant is explained hereunder.
Embodiment 1 According to a first embodiment of the present invention, an aqueous solution containing 20% guanidine phosphate and 300 guanidine sulfamate is heated to 50°C to complete dissolution, pH
adjusted by phosphoric acid and ammonia water in the range of 7.0 to 8.0, and cooled down to 20°C to obtain aqueous solution of the flame retardant (trial produced aqueous solution 2). Aqueous solution of the flame retardant (trial produced aqueous solution 2) obtained by mixing 50% of the trial produced aqueous solution 1 and 50% of ready-made boric acid compound system flame retardant (high-concentration boric acid compound obtained by mixing boric acid compound into either of aqueous solution of sequestering agent or wet permeability surface active agent so that solubility equal to or more than 5 g/water 1008 in room temperature is obtained, and by causing hydrothermal reaction to this mixture at 60°C or higher) is charged to alder material (220 mm x 220 mm in size, 30 mm in thickness) by depressurization and pressurization method in room temperature and high-temperature atmosphere.
Depressurization and pressurization are carried out as follows:
Depressurization at 50 mm Hg for 1 to 2 hours and pressurization at 5 kg/cmz for 1 to 2 hours are repeated twice.
Drying is carried out at 40°C for 24 hours and then at 70°C
to 100°C for 48 hours.
Performance test of the alder subjected to impregnation treatment and drying according to Embodiment 1 shown above was carried out, and the following results were obtained:
Table 3 Heating time Amount of Temperature Flaming Afterflame 6 min. impregnation time area coefficient (sec.) (%) (td 8 ) (CA) 'h~ial produced aqueous solution83'8 375.0 3I.5 89 Trial produced 102.7 0 71.0 14 aqueous solution As shown the above results,. with trial produced aqueous solution 2, incombustible features which meet incombustible material standard were obtained. It proves that with the use of aqueous solution in which phosphoric acid compound, sulfate compound, and boric acid compound are mixed in well-balanced state, it is possible to obtain incombustible materials which meet the incombustible material standard specified in the Building Standard Law.
Embodiment 2 According to a second embodiment of the present invention, a flame retardant (trial produced aqueous solution 3) obtained by mixing 50% of 50% aqueous solution of condensed carbamate phosphate and amide sulfonate, and 50% of ready-made boric acid compound system flame retardant (high-concentration boric acid compound obtained by mixing boric acid compound into either of aqueous solution of sequestering agent or wet permeability surface active agent so that solubility 5 g/water 1008 or more in room temperature is obtained, and by causing hydrothermal reaction to this mixture at 60°C or higher) is charged to alder material (220 mm x 220 mm in size, 30 mm in thickness) by depressurization and pressurization method in room temperature and high-temperature atmosphere. Depressurization and pressurization are carried out as follows: Depressurization at 50 mm Hg for 1 to 2 hours and pressurization at 5 kg/cm2 for 1 to 2 hours are repeated twice.
Drying is carried out at 40°C for 24 hours and then at 70°C
to 100°C for 48 hours.
Performance test of the alder subjected to impregnation treatment and drying according to Embodiment 2 shown above was carried out, and the following results were obtained.
Table 4 Amount of Temperature Flaming Afterflame impregnation time area coe~cient (sec.) (%) (td 6 ) (CA) Alder 1 93.0 0 84.0 29 Alder 2 105.0 0 54.0 25 Alder 3 120.9 0 72.0 27 As shown in the above results, it is possible to obtain wooden material which meets the incombustible material standard by impregnating the wooden material with a mixture of condensed carbamate phosphate, amide sulfonate, and boric acid compound (30%
or more solid content) by approximately 100%.
Embodiment 3 The present invention according to a third embodiment is now described using aqueous solution (flame retardant 1) obtained by dissolving aqueous solution containing 10% ammonium pentaborate, 15% condensed carbamate phosphate, and 5% ammonium sulfamate thoroughly at 50 to 70°C and cooling down to room temperature (20°C), alder (220 mm x 220 mm in size, 30 mm in thickness) and Japanese cedar (220 mm x 220 mm in size, 15 mm in thickness) were treated.
Moisture, oil and fat contained in the wooden material to be tested are removed beforehand, and treatment is provided to secure sufficient voids in the wooden material, and then dried to attain moisture percentage of 2% or Less.
The wooden material is fixed to a pressure vessel made of stainless steel so that it may not be moved by buoyancy, and the wooden material is impregnated sufficiently with the flame retardant 1.
Depressurization treatment (50 mmHg) is carried out in room temperature for two hours followed by pressurization treatment (5 kg/cmz) for two hours. This cycle is repeated twice to complete the process.
The wooden material obtained by above-mentioned process had alder which was impregnated with flame retardant 1 by 1980 and ,7apanese cedar which was impregnated with the same by 203-°s.
Following that, the flame retardant 1 was drained off as waste, the wooden material was taken out, and dried at 40°C for 24 hours and at 70°C for 48 hours.
The wooden material was stored for one month in a constant-temperature bath with humidity 40% or less and subjected to surface heating test (heating time 6 min.) specified in JIS A1321, and the following results were obtained.
Table 5 Amount of solutionTemperature Flaming Afterflame impregnation time area coefficient (sec.) (%) Ltd 8 ) (CA) Alder 198 138.0 72.0 25 Japanese cedar203 287.5 49.0 27 As shown above, the wooden material made of both alder and Japanese cedar satisfies the incombustible material standard.
Embodiment 4 According to a fourth embodiment of the present invention an aqueous solution (flame retardant 2) obtained by dissolving aqueous solution containing 10% ammonium pentaborate, 15%
condensed carbamate phosphate, 3% ammonium sulfamate, and 2%
ammonium bromide thoroughly at 50 to 70°C, which was then cooled down to room temperature and adjusted to contain 30% or more solid content, was applied to Japanese cedar (220 mm x 220 mm in size, 15 mm in thickness). Moisture, oil and fat contained in the wooden material were removed beforehand, and treatment was provided for formation of sufficient voids in the wooden material, and dried to attain moisture percentage of 2% or less.
Besides, the wooden material was fixed to a pressure vessel made of stainless steel so that it might not be moved by buoyancy, and impregnated sufficiently with flame retardant 2.
Depressurization treatment (50 mmHg) was carried out in room temperature for two hours and then pressurization treatment (5 kg/cm2) was carried out for two hours. This cycle was repeated twice to complete the process.
The wooden material was stored for one month in a constant-temperature bath with humidity 40% or less and subjected to surface heating test (heating time 6 min.) specified in JIS A1321, and the following results were obtained.
Table 6 Amount of solutionTemperature Flaming Afterflame _ _ _impregnation(%)time area coefficient (sec.) (td 8 ) (CA) ~apanese cedar188 89.8 83.5 13 I
As shown above, it was also possible to obtain wooden material which meets the incombustible standard by adding ammonium bromide instead of reducing ammonium sulfamate.
Embodiment 5 According to a fifth embodiment of the present invention an aqueous solution (flame retardant 3) was obtained in such a manner that thirteen parts of condensed carbamate phosphate was added to 70 parts of water, adjusted by ammonia water to pH 8.0 to 8.5;
aqueous solution containing 13 parts of ammonium pentaborate, four parts of ammonium sulfamate, and one part of ammonium bromide was dissolved thoroughly at 50 to 70°C, cooled down to room temperature after being adjusted by ammonia water to pH 0 to 8.5, and adjusted to contain 30% or more solid content, and was applied to wooden material of Japanese cedar (220 x 220 mm in size, 12 mm in thickness). Moisture and oil and fat contained in the wooden material were removed beforehand, and treatment was provided for formation of sufficient voids in the wooden material, and dried to attain moisture percentage of 20 or less.
Besides, the wooden material was fixed to a pressure vessel made of stainless steel so that it might not be moved by buoyancy, and impregnated sufficiently with the flame retardant 3.
Depressurization treatment (50 mmHg) was carried out in room temperature for two hours and then pressurization treatment (5 kg/cmz) was carried out for two hours. This cycle was repeated twice to complete the process.
The wooden material was stored for one month in a constant-temperature bath with humidity 40% or less and subjected to surface heating test (heating time 6 min.) specified in JIS A1321, and the following results were obtained.
Table 7 Amount of solutionTemperature Flaming Afterflame impregnation time area coefficient (sec.) (%) (td 8 ) (CA) Japanese cedar143 18.0 72.0 29 Japanese cedar204 5.0 60.0 0 Japanese cedar223 0 82.5 0 Japanese cedar219 0 61.1 0 Japanese cedar219 0 68.1 4 Japanese cedar68 48.0 78.0 49 As shown above, with the flame retardant 3, the wooden material which meets the incombustible material standard was obtained for the case in which the amount of aqueous solution impregnated was 1000 or more while the wooden material which meets the incombustible material standard was not obtained with less than 100% impregnation.
Embodiment 6 According to a sixth embodiment of the present invention, an aqueous solution (flame retardant 4) was obtained in such a manner that thirteen parts of condensed carbamate phosphate was added to 70 parts of water, adjusted by ammonia water to pH 8.0 to 8.5, ten parts of ammonium pentaborate, five parts of ammonium sulfamate, and two parts of ammonium bromide were added, dissolved thoroughly at 50 to 70°C, and then cooled down to 20°C, and was applied to wooden material of Japanese cedar (220 mm x 220 mm in size, 12 mm in thickness). Moisture, oil and fat contained in the wooden material were removed beforehand, and treatment was provided for formation of sufficient voids in wooden material, and dried to attain moisture percentage of 2~ or less.
Besides, the wooden material was fixed to a pressure vessel made of stainless steel so that it might not be moved by buoyancy, and impregnated sufficiently with the flame retardant 4.
Depressurization treatment (50 mmHg) was carried out in room temperature for two hours and then pressurization treatment (5 kg/cm2) was carried out for two hours. This cycle was repeated twice to complete the process.
The wooden material was stored for one month in a constant-temperature bath with humidity 40% or less and subjected to the fire performance test specified in the Ministry of Construction Notification No. 1231 (1976) conducted at General Building Research Corporation of Japan, and the following results were obtained.
Table 8 ~LlrlaCe I,esb Amount of Temperature time Flaming Afterflame impregnation area (C- min.) coefficient(sec.) (CA) (g/cm~) Test body 80 (solid state)0 110 0 A
Test body 80 0 63.5 0 B
Test body 81 0 116 0 C
Table 9 rn le~b IC.7litLJ
Name of test Surface test Symbol of test A B C
body Size (mm) 221 x 221 220 x 223 220 x 225 Thickness (mm) 12.3 ~ 12.2 ( 12.4--Mass (g) 320.2 I 283.6 ; 293.4 C;wring period 36 36 ! 36 (days) Heating time (min.)6 ' 6 ~ 6 Temperature time 0 0 0 area (td D ) Flaming coefficient110 63.5 116 (CA) Afterflame time 0 0 0 (sec.) Deformation detrimental None None None to flame prevention Melting across entire None None None thickness Presence of crack None None None !
(mm) j Loss on heat 29.8 28.9 30.6 (g) Rear space temperature51 52 60 (~) Qualification Qualified Remarks Qualified Name of test Qualified Main heat source (kW) Ancillary heat source (kW) Surface test 1.5 0.35 Gas toxic property 1.5 0.35 test Air flowrate (L/min.)Primary 3.0 Secondary:
25.0 Table 10 Gas toxic nronertv test Name of test Gas toxic property Symbo! of test test E
body Standard material D
Size (mm) 220 X 216 221 X 223 220 X 223 Thickness (mm) 9.8 I2.3 12.4 Mass (g) 214.6 315.3 313.5 Curing period >_ 60 37 3 7 (days) Heating time (min.)6 6 6 Mouse family ~ ICR family ICR family ~ ICR farnily Gender Average mass of mouse 21.8 21.8 21.4 (g) l4Taximum exhaust389 233 240 temperature (C) 28.1 27.7 28. i Initial temperature inside the test box (~C) Maximum temperature2~_5 28.7 28.1 inside the test box (C) l4Zouse behavioral record 6.91 14.41 4.2<i x (min.) a (min.) 0.34 0.50 0.85 x3 (min.) 6.57 13.91 13.10 Loss on heat (g) 68.0 37.2 34.6 Qualification - Qualified Qualified Reference figure COa Max. (%) 5.48 1.58 1.53 CO Max. (r6) 1.35 D.18 D.15 Os Min. (%) 14.3 18.5 18.5 As shown above, the wooden material was qualified by the tests specified in Articles 2 and 4 in the Ministry of Construction Notification No. 1231 (1976) and the wooden material which could be used as incombustible materials was thus obtained.
Chemicals such as boric compounds, boric acid, borax, ammonium borate or the like are used in the above-mentioned embodiments. Phosphoric acid compounds include condensed carbamate phosphate, guanidine phosphate, etc. Sulfamate compounds include guanidine sulfamate, amide sulfonate, etc. In addition, phosphate, bromide, etc. are used.
In the embodiments mentioned above, although an explanation is given for alder and Japanese cedar to be used as woody material for construction use, it goes without saying that incombustible materials can be obtained by impregnating other materials such as spruce, Japanese cypress, red cedar, pine, American cypress or the like with the flame retardant.
Using a mixture of alcohol and nondrying solvent, surface treatment is provided to the incombustible wooden material which is produced by impregnating the woody material for construction use with the tame retardant obtained in embodiments 1 to 6 and dried.
As for surface treatment methods, coating method using a brush and others, and spraying method using a spray or the like are available. In a state where adhesion onto the surface is sparse, it is spread and rubbed over entire surface using woven cloth or unwoven cloth. In the case of excessive adhesion, it is wiped off.
As for the above-mentioned alcohol, markit, methyl alcohol, isopropyl alcohol or the like are used. As for nondrying solvent, castor oil, olive oil, arachis oil, camellia oil, hydrocarbon oil or the like are used. As for mixing ratio of alcohol and nondrying solvent, the volume ratio of alcohol 1 to 9 to nondrying solvent 9 to 1 is used depending on quality of material and dried state of woody material for construction use.
Table 11 Alcohol 1 3 5 7 9 Nondrying solvent 9 7 5 3 1
Technical Advantage of the Invention The present invention has realized incombustible members which meet incombustible material standard for woody materials by using aqueous solution in which phosphoric acid compound, sulfamate compound, and boric acid compound are mixed in well-balanced state.
In particular, mixing of sulfamate compound resulting in generation of nitrogen gas due to increased temperature at fire breakout and in suppression of afterflame and furthermore, adoption of ammonium bromide improves incombustible features of wooden materials.
If no additional treatments are given, blushing phenomena occur on the surface of the woody material, and white powders of the above-mentioned flame retardant appear on the surface three months or more after treatment.
With the present invention, a material including a mixture of alcohol and nondrying solvent is coated or sprayed onto the surface of the woody material being converted to incombustible quality, and the above-mentioned flame retardant is locked into the member and generation of white powders on the surface is suppressed.
Furthermore, the surface treatment enables reduction in moisture absorbent from the surface of woody material, prevention of decomposition and decay of the material concerned is made possible thereby resulting in long time usage of woody material.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 shows a measurement curve of a test body;
Fig. 2 shows a measurement curve of another test body; and Fig. 3 shows a measurement curve of another test body.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring to embodiments 1 to 6, a process of impregnating of woody material with a flame retardant is explained hereunder.
Embodiment 1 According to a first embodiment of the present invention, an aqueous solution containing 20% guanidine phosphate and 300 guanidine sulfamate is heated to 50°C to complete dissolution, pH
adjusted by phosphoric acid and ammonia water in the range of 7.0 to 8.0, and cooled down to 20°C to obtain aqueous solution of the flame retardant (trial produced aqueous solution 2). Aqueous solution of the flame retardant (trial produced aqueous solution 2) obtained by mixing 50% of the trial produced aqueous solution 1 and 50% of ready-made boric acid compound system flame retardant (high-concentration boric acid compound obtained by mixing boric acid compound into either of aqueous solution of sequestering agent or wet permeability surface active agent so that solubility equal to or more than 5 g/water 1008 in room temperature is obtained, and by causing hydrothermal reaction to this mixture at 60°C or higher) is charged to alder material (220 mm x 220 mm in size, 30 mm in thickness) by depressurization and pressurization method in room temperature and high-temperature atmosphere.
Depressurization and pressurization are carried out as follows:
Depressurization at 50 mm Hg for 1 to 2 hours and pressurization at 5 kg/cmz for 1 to 2 hours are repeated twice.
Drying is carried out at 40°C for 24 hours and then at 70°C
to 100°C for 48 hours.
Performance test of the alder subjected to impregnation treatment and drying according to Embodiment 1 shown above was carried out, and the following results were obtained:
Table 3 Heating time Amount of Temperature Flaming Afterflame 6 min. impregnation time area coefficient (sec.) (%) (td 8 ) (CA) 'h~ial produced aqueous solution83'8 375.0 3I.5 89 Trial produced 102.7 0 71.0 14 aqueous solution As shown the above results,. with trial produced aqueous solution 2, incombustible features which meet incombustible material standard were obtained. It proves that with the use of aqueous solution in which phosphoric acid compound, sulfate compound, and boric acid compound are mixed in well-balanced state, it is possible to obtain incombustible materials which meet the incombustible material standard specified in the Building Standard Law.
Embodiment 2 According to a second embodiment of the present invention, a flame retardant (trial produced aqueous solution 3) obtained by mixing 50% of 50% aqueous solution of condensed carbamate phosphate and amide sulfonate, and 50% of ready-made boric acid compound system flame retardant (high-concentration boric acid compound obtained by mixing boric acid compound into either of aqueous solution of sequestering agent or wet permeability surface active agent so that solubility 5 g/water 1008 or more in room temperature is obtained, and by causing hydrothermal reaction to this mixture at 60°C or higher) is charged to alder material (220 mm x 220 mm in size, 30 mm in thickness) by depressurization and pressurization method in room temperature and high-temperature atmosphere. Depressurization and pressurization are carried out as follows: Depressurization at 50 mm Hg for 1 to 2 hours and pressurization at 5 kg/cm2 for 1 to 2 hours are repeated twice.
Drying is carried out at 40°C for 24 hours and then at 70°C
to 100°C for 48 hours.
Performance test of the alder subjected to impregnation treatment and drying according to Embodiment 2 shown above was carried out, and the following results were obtained.
Table 4 Amount of Temperature Flaming Afterflame impregnation time area coe~cient (sec.) (%) (td 6 ) (CA) Alder 1 93.0 0 84.0 29 Alder 2 105.0 0 54.0 25 Alder 3 120.9 0 72.0 27 As shown in the above results, it is possible to obtain wooden material which meets the incombustible material standard by impregnating the wooden material with a mixture of condensed carbamate phosphate, amide sulfonate, and boric acid compound (30%
or more solid content) by approximately 100%.
Embodiment 3 The present invention according to a third embodiment is now described using aqueous solution (flame retardant 1) obtained by dissolving aqueous solution containing 10% ammonium pentaborate, 15% condensed carbamate phosphate, and 5% ammonium sulfamate thoroughly at 50 to 70°C and cooling down to room temperature (20°C), alder (220 mm x 220 mm in size, 30 mm in thickness) and Japanese cedar (220 mm x 220 mm in size, 15 mm in thickness) were treated.
Moisture, oil and fat contained in the wooden material to be tested are removed beforehand, and treatment is provided to secure sufficient voids in the wooden material, and then dried to attain moisture percentage of 2% or Less.
The wooden material is fixed to a pressure vessel made of stainless steel so that it may not be moved by buoyancy, and the wooden material is impregnated sufficiently with the flame retardant 1.
Depressurization treatment (50 mmHg) is carried out in room temperature for two hours followed by pressurization treatment (5 kg/cmz) for two hours. This cycle is repeated twice to complete the process.
The wooden material obtained by above-mentioned process had alder which was impregnated with flame retardant 1 by 1980 and ,7apanese cedar which was impregnated with the same by 203-°s.
Following that, the flame retardant 1 was drained off as waste, the wooden material was taken out, and dried at 40°C for 24 hours and at 70°C for 48 hours.
The wooden material was stored for one month in a constant-temperature bath with humidity 40% or less and subjected to surface heating test (heating time 6 min.) specified in JIS A1321, and the following results were obtained.
Table 5 Amount of solutionTemperature Flaming Afterflame impregnation time area coefficient (sec.) (%) Ltd 8 ) (CA) Alder 198 138.0 72.0 25 Japanese cedar203 287.5 49.0 27 As shown above, the wooden material made of both alder and Japanese cedar satisfies the incombustible material standard.
Embodiment 4 According to a fourth embodiment of the present invention an aqueous solution (flame retardant 2) obtained by dissolving aqueous solution containing 10% ammonium pentaborate, 15%
condensed carbamate phosphate, 3% ammonium sulfamate, and 2%
ammonium bromide thoroughly at 50 to 70°C, which was then cooled down to room temperature and adjusted to contain 30% or more solid content, was applied to Japanese cedar (220 mm x 220 mm in size, 15 mm in thickness). Moisture, oil and fat contained in the wooden material were removed beforehand, and treatment was provided for formation of sufficient voids in the wooden material, and dried to attain moisture percentage of 2% or less.
Besides, the wooden material was fixed to a pressure vessel made of stainless steel so that it might not be moved by buoyancy, and impregnated sufficiently with flame retardant 2.
Depressurization treatment (50 mmHg) was carried out in room temperature for two hours and then pressurization treatment (5 kg/cm2) was carried out for two hours. This cycle was repeated twice to complete the process.
The wooden material was stored for one month in a constant-temperature bath with humidity 40% or less and subjected to surface heating test (heating time 6 min.) specified in JIS A1321, and the following results were obtained.
Table 6 Amount of solutionTemperature Flaming Afterflame _ _ _impregnation(%)time area coefficient (sec.) (td 8 ) (CA) ~apanese cedar188 89.8 83.5 13 I
As shown above, it was also possible to obtain wooden material which meets the incombustible standard by adding ammonium bromide instead of reducing ammonium sulfamate.
Embodiment 5 According to a fifth embodiment of the present invention an aqueous solution (flame retardant 3) was obtained in such a manner that thirteen parts of condensed carbamate phosphate was added to 70 parts of water, adjusted by ammonia water to pH 8.0 to 8.5;
aqueous solution containing 13 parts of ammonium pentaborate, four parts of ammonium sulfamate, and one part of ammonium bromide was dissolved thoroughly at 50 to 70°C, cooled down to room temperature after being adjusted by ammonia water to pH 0 to 8.5, and adjusted to contain 30% or more solid content, and was applied to wooden material of Japanese cedar (220 x 220 mm in size, 12 mm in thickness). Moisture and oil and fat contained in the wooden material were removed beforehand, and treatment was provided for formation of sufficient voids in the wooden material, and dried to attain moisture percentage of 20 or less.
Besides, the wooden material was fixed to a pressure vessel made of stainless steel so that it might not be moved by buoyancy, and impregnated sufficiently with the flame retardant 3.
Depressurization treatment (50 mmHg) was carried out in room temperature for two hours and then pressurization treatment (5 kg/cmz) was carried out for two hours. This cycle was repeated twice to complete the process.
The wooden material was stored for one month in a constant-temperature bath with humidity 40% or less and subjected to surface heating test (heating time 6 min.) specified in JIS A1321, and the following results were obtained.
Table 7 Amount of solutionTemperature Flaming Afterflame impregnation time area coefficient (sec.) (%) (td 8 ) (CA) Japanese cedar143 18.0 72.0 29 Japanese cedar204 5.0 60.0 0 Japanese cedar223 0 82.5 0 Japanese cedar219 0 61.1 0 Japanese cedar219 0 68.1 4 Japanese cedar68 48.0 78.0 49 As shown above, with the flame retardant 3, the wooden material which meets the incombustible material standard was obtained for the case in which the amount of aqueous solution impregnated was 1000 or more while the wooden material which meets the incombustible material standard was not obtained with less than 100% impregnation.
Embodiment 6 According to a sixth embodiment of the present invention, an aqueous solution (flame retardant 4) was obtained in such a manner that thirteen parts of condensed carbamate phosphate was added to 70 parts of water, adjusted by ammonia water to pH 8.0 to 8.5, ten parts of ammonium pentaborate, five parts of ammonium sulfamate, and two parts of ammonium bromide were added, dissolved thoroughly at 50 to 70°C, and then cooled down to 20°C, and was applied to wooden material of Japanese cedar (220 mm x 220 mm in size, 12 mm in thickness). Moisture, oil and fat contained in the wooden material were removed beforehand, and treatment was provided for formation of sufficient voids in wooden material, and dried to attain moisture percentage of 2~ or less.
Besides, the wooden material was fixed to a pressure vessel made of stainless steel so that it might not be moved by buoyancy, and impregnated sufficiently with the flame retardant 4.
Depressurization treatment (50 mmHg) was carried out in room temperature for two hours and then pressurization treatment (5 kg/cm2) was carried out for two hours. This cycle was repeated twice to complete the process.
The wooden material was stored for one month in a constant-temperature bath with humidity 40% or less and subjected to the fire performance test specified in the Ministry of Construction Notification No. 1231 (1976) conducted at General Building Research Corporation of Japan, and the following results were obtained.
Table 8 ~LlrlaCe I,esb Amount of Temperature time Flaming Afterflame impregnation area (C- min.) coefficient(sec.) (CA) (g/cm~) Test body 80 (solid state)0 110 0 A
Test body 80 0 63.5 0 B
Test body 81 0 116 0 C
Table 9 rn le~b IC.7litLJ
Name of test Surface test Symbol of test A B C
body Size (mm) 221 x 221 220 x 223 220 x 225 Thickness (mm) 12.3 ~ 12.2 ( 12.4--Mass (g) 320.2 I 283.6 ; 293.4 C;wring period 36 36 ! 36 (days) Heating time (min.)6 ' 6 ~ 6 Temperature time 0 0 0 area (td D ) Flaming coefficient110 63.5 116 (CA) Afterflame time 0 0 0 (sec.) Deformation detrimental None None None to flame prevention Melting across entire None None None thickness Presence of crack None None None !
(mm) j Loss on heat 29.8 28.9 30.6 (g) Rear space temperature51 52 60 (~) Qualification Qualified Remarks Qualified Name of test Qualified Main heat source (kW) Ancillary heat source (kW) Surface test 1.5 0.35 Gas toxic property 1.5 0.35 test Air flowrate (L/min.)Primary 3.0 Secondary:
25.0 Table 10 Gas toxic nronertv test Name of test Gas toxic property Symbo! of test test E
body Standard material D
Size (mm) 220 X 216 221 X 223 220 X 223 Thickness (mm) 9.8 I2.3 12.4 Mass (g) 214.6 315.3 313.5 Curing period >_ 60 37 3 7 (days) Heating time (min.)6 6 6 Mouse family ~ ICR family ICR family ~ ICR farnily Gender Average mass of mouse 21.8 21.8 21.4 (g) l4Taximum exhaust389 233 240 temperature (C) 28.1 27.7 28. i Initial temperature inside the test box (~C) Maximum temperature2~_5 28.7 28.1 inside the test box (C) l4Zouse behavioral record 6.91 14.41 4.2<i x (min.) a (min.) 0.34 0.50 0.85 x3 (min.) 6.57 13.91 13.10 Loss on heat (g) 68.0 37.2 34.6 Qualification - Qualified Qualified Reference figure COa Max. (%) 5.48 1.58 1.53 CO Max. (r6) 1.35 D.18 D.15 Os Min. (%) 14.3 18.5 18.5 As shown above, the wooden material was qualified by the tests specified in Articles 2 and 4 in the Ministry of Construction Notification No. 1231 (1976) and the wooden material which could be used as incombustible materials was thus obtained.
Chemicals such as boric compounds, boric acid, borax, ammonium borate or the like are used in the above-mentioned embodiments. Phosphoric acid compounds include condensed carbamate phosphate, guanidine phosphate, etc. Sulfamate compounds include guanidine sulfamate, amide sulfonate, etc. In addition, phosphate, bromide, etc. are used.
In the embodiments mentioned above, although an explanation is given for alder and Japanese cedar to be used as woody material for construction use, it goes without saying that incombustible materials can be obtained by impregnating other materials such as spruce, Japanese cypress, red cedar, pine, American cypress or the like with the flame retardant.
Using a mixture of alcohol and nondrying solvent, surface treatment is provided to the incombustible wooden material which is produced by impregnating the woody material for construction use with the tame retardant obtained in embodiments 1 to 6 and dried.
As for surface treatment methods, coating method using a brush and others, and spraying method using a spray or the like are available. In a state where adhesion onto the surface is sparse, it is spread and rubbed over entire surface using woven cloth or unwoven cloth. In the case of excessive adhesion, it is wiped off.
As for the above-mentioned alcohol, markit, methyl alcohol, isopropyl alcohol or the like are used. As for nondrying solvent, castor oil, olive oil, arachis oil, camellia oil, hydrocarbon oil or the like are used. As for mixing ratio of alcohol and nondrying solvent, the volume ratio of alcohol 1 to 9 to nondrying solvent 9 to 1 is used depending on quality of material and dried state of woody material for construction use.
Table 11 Alcohol 1 3 5 7 9 Nondrying solvent 9 7 5 3 1
Claims (6)
1. A method for manufacturing a woody material for construction use, the method comprising the steps of:
a) removing beforehand moisture, oil and fat contained in a wooden material, and securing voids in the wooden material;
b) impregnating said wooden material sufficiently with a flame retardant prepared in such a manner that an aqueous solution of condensate of phosphoric acid and urea is pH adjusted by adding ammonia water, ammonium borate and ammonium sulfamate;
c) repeating thereafter depressurization treatment and pressurization treatment a plurality of times in room temperature or high-temperature atmosphere to obtain an impregnated wooden material which is impregnated with the flame retardant 100% to 250%;
d) drying thereafter the impregnated wooden material to obtain a flame retardant woody material; and e) after drying, coating or spraying a mixture of alcohol and nondrying solvent onto the surface of the flame retardant woody material.
a) removing beforehand moisture, oil and fat contained in a wooden material, and securing voids in the wooden material;
b) impregnating said wooden material sufficiently with a flame retardant prepared in such a manner that an aqueous solution of condensate of phosphoric acid and urea is pH adjusted by adding ammonia water, ammonium borate and ammonium sulfamate;
c) repeating thereafter depressurization treatment and pressurization treatment a plurality of times in room temperature or high-temperature atmosphere to obtain an impregnated wooden material which is impregnated with the flame retardant 100% to 250%;
d) drying thereafter the impregnated wooden material to obtain a flame retardant woody material; and e) after drying, coating or spraying a mixture of alcohol and nondrying solvent onto the surface of the flame retardant woody material.
2. The method of claim 1, wherein step b) further comprises subsequently adding ammonium bromide to the aqueous solution.
3. A method for manufacturing woody material for construction use, the method comprising the steps of:
a) removing beforehand moisture, oil and fat contained in a wooden material, and securing voids in the wooden material;
b) impregnating said wooden material sufficiently with a flame retardant prepared in such a manner that a mixed aqueous solution of guanidine phosphate and guanidine sulfamate is pH adjusted by phosphoric acid and ammonia water, and a boric acid compound system flame retardant is then mixed;
c) repeating thereafter depressurization treatment and pressurization treatment a plurality of times in room temperature or high-temperature atmosphere to obtain an impregnated wooden material which is impregnated with the flame retardant 100% to 250%;
d) drying thereafter the impregnated wooden material to obtain a flame retardant woody material; and e) after drying, coating or spraying a mixture of alcohol and nondrying solvent onto the surface of the flame retardant woody material.
a) removing beforehand moisture, oil and fat contained in a wooden material, and securing voids in the wooden material;
b) impregnating said wooden material sufficiently with a flame retardant prepared in such a manner that a mixed aqueous solution of guanidine phosphate and guanidine sulfamate is pH adjusted by phosphoric acid and ammonia water, and a boric acid compound system flame retardant is then mixed;
c) repeating thereafter depressurization treatment and pressurization treatment a plurality of times in room temperature or high-temperature atmosphere to obtain an impregnated wooden material which is impregnated with the flame retardant 100% to 250%;
d) drying thereafter the impregnated wooden material to obtain a flame retardant woody material; and e) after drying, coating or spraying a mixture of alcohol and nondrying solvent onto the surface of the flame retardant woody material.
4. A method for manufacturing woody material for construction use, the method comprising the steps of:
a) removing beforehand moisture, oil and fat contained in a wooden material, and securing voids in the wooden material;
b) impregnating said wooden material sufficiently with a flame retardant prepared by mixing a mixed aqueous solution of condensed carbamate phosphate and amide sulfonate, and a boric acid compound system;
c) repeating thereafter depressurization treatment and pressurization treatment a plurality of times in room temperature or high-temperature atmosphere to obtain an impregnated wooden material which is impregnated with the flame retardant 100% to 250%;
d) drying thereafter the impregnated wooden material to obtain a flame retardant woody material; and e) after drying, coating or spraying a mixture of alcohol and nondrying solvent onto the surface of the flame retardant woody material.
a) removing beforehand moisture, oil and fat contained in a wooden material, and securing voids in the wooden material;
b) impregnating said wooden material sufficiently with a flame retardant prepared by mixing a mixed aqueous solution of condensed carbamate phosphate and amide sulfonate, and a boric acid compound system;
c) repeating thereafter depressurization treatment and pressurization treatment a plurality of times in room temperature or high-temperature atmosphere to obtain an impregnated wooden material which is impregnated with the flame retardant 100% to 250%;
d) drying thereafter the impregnated wooden material to obtain a flame retardant woody material; and e) after drying, coating or spraying a mixture of alcohol and nondrying solvent onto the surface of the flame retardant woody material.
5. A method for manufacturing woody material for construction use, the method comprising the steps of:
a) removing beforehand moisture, oil and fat contained in a wooden material, and securing voids in the wooden material;
b) impregnating said wooden material sufficiently with a flame retardant prepared in such a manner that a mixed aqueous solution of ammonium pentaborate, condensed carbamate phosphate and ammonium sulfamate is adjusted to contain 30% or more of solid content or a mixed aqueous solution containing said composition and added ammonium bromide is adjusted to contain 30% or more solid content;
c) repeating thereafter depressurization treatment and pressurization treatment a plurality of times in room temperature or high-temperature atmosphere to obtain an impregnated wooden material which is impregnated with the flame retardant 100% to 250%;
d) drying thereafter the impregnated wooden material to obtain a flame retardant woody material; and e) after drying, coating or spraying a mixture of alcohol and nondrying solvent onto the surface of the flame retardant woody material.
a) removing beforehand moisture, oil and fat contained in a wooden material, and securing voids in the wooden material;
b) impregnating said wooden material sufficiently with a flame retardant prepared in such a manner that a mixed aqueous solution of ammonium pentaborate, condensed carbamate phosphate and ammonium sulfamate is adjusted to contain 30% or more of solid content or a mixed aqueous solution containing said composition and added ammonium bromide is adjusted to contain 30% or more solid content;
c) repeating thereafter depressurization treatment and pressurization treatment a plurality of times in room temperature or high-temperature atmosphere to obtain an impregnated wooden material which is impregnated with the flame retardant 100% to 250%;
d) drying thereafter the impregnated wooden material to obtain a flame retardant woody material; and e) after drying, coating or spraying a mixture of alcohol and nondrying solvent onto the surface of the flame retardant woody material.
6. A method for manufacturing woody material for construction use, the method comprising the steps of:
a) removing beforehand moisture, oil and fat contained in a wooden material, and securing voids in the wooden material;
b) impregnating said wooden material sufficiently with a flame retardant prepared in such a manner that boric acid is dissolved in ammonia water, condensed carbamate phosphate, ammonium sulfamate, ammonium bromide are dissolved thoroughly, and this solution is adjusted to contain 30% or more solid content;
c) repeating thereafter depressurization treatment and pressurization treatment a plurality of times in room temperature or high-temperature atmosphere to obtain an impregnated wooden material which is impregnated with the flame retardant 100% to 250%;
d) drying thereafter the wooden material to obtain a flame retardant woody material; and e) after drying, coating or spraying a mixture of alcohol and nondrying solvent onto the surface of the flame retardant woody material.
a) removing beforehand moisture, oil and fat contained in a wooden material, and securing voids in the wooden material;
b) impregnating said wooden material sufficiently with a flame retardant prepared in such a manner that boric acid is dissolved in ammonia water, condensed carbamate phosphate, ammonium sulfamate, ammonium bromide are dissolved thoroughly, and this solution is adjusted to contain 30% or more solid content;
c) repeating thereafter depressurization treatment and pressurization treatment a plurality of times in room temperature or high-temperature atmosphere to obtain an impregnated wooden material which is impregnated with the flame retardant 100% to 250%;
d) drying thereafter the wooden material to obtain a flame retardant woody material; and e) after drying, coating or spraying a mixture of alcohol and nondrying solvent onto the surface of the flame retardant woody material.
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|---|---|---|---|
| CA 2520331 CA2520331A1 (en) | 2005-09-20 | 2005-09-20 | Method for manufacturing woody materials for construction use |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2520331 CA2520331A1 (en) | 2005-09-20 | 2005-09-20 | Method for manufacturing woody materials for construction use |
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| CA2520331A1 true CA2520331A1 (en) | 2007-03-20 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104772807A (en) * | 2015-04-21 | 2015-07-15 | 广东省宜华木业股份有限公司 | Broad-leaved wood board gum-removing and drying integrated treatment method |
-
2005
- 2005-09-20 CA CA 2520331 patent/CA2520331A1/en not_active Abandoned
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104772807A (en) * | 2015-04-21 | 2015-07-15 | 广东省宜华木业股份有限公司 | Broad-leaved wood board gum-removing and drying integrated treatment method |
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