KR101300441B1 - Manufacturing methods of flame-retardant wood - Google Patents

Abstract

The present invention is to absorb water glass or a mixture of water and water and water into the pores of the wood, intracellular gaps, cell gaps, the surface and the carbon dioxide is blown and dried to produce inorganic and flame retardant material in the pores of the wood and the silicate gel and dioxide produced The flame retardant wood has the characteristics of silicified wood by silicon, and it is expected to increase the utilization as interior and exterior wood building materials as it can improve the dimensional stability of wood and reduce the occurrence of toxic gas in the fire by reducing the high temperature drying process. It relates to a method for producing a flame retardant wood.

Description

MANUFACTURING METHODS OF FLAME-RETARDANT WOOD

The present invention relates to a method for producing a flame retardant wood having siliceous wood characteristics, and in particular, water glass or a mixture of water glass and water is absorbed into the intracellular cavity, the cell gap, the surface of the pores of the wood portion, the carbon dioxide is blown and dried to harden the wood part Inorganic and flame retardant materials are formed in the voids, and the flame retardant wood has the characteristics of siliceous wood by the silica gel and silicon dioxide produced, and it does not go through a separate high temperature drying process to improve the dimensional stability of wood and to increase the combustion in case of fire and toxic gas The present invention relates to a method for manufacturing a flame-retardant wood that can reduce the occurrence and is expected to increase the utilization as a exterior material in wood building.

In general, regulations on building materials and exterior materials are being strengthened as a way to reduce human and property damages in case of fires of general buildings and wooden condition buildings.In order to slow down or prevent the spread of flames in case of fires, The law mandates the use of semi-combustible and non-combustible interior finishes.

For example, in the wake of the Yong-in Gosiwon fire disaster, the revised special law on safety management of multi-use businesses was mandated to install non-combustible or quasi-non-combustible materials for the replacement finishing materials as well as the initial installation finishes for multi-use businesses including Ko Si-won.

Therefore, flame retardant materials, quasi-non-combustible materials, and non-combustible materials should not be easily flammable in a fire, and should be able to minimize the type and amount of toxic gases generated from these materials.

Examining the Ministry of Construction and Transportation and KS F 2271 Building Flame Retardant Test Criteria, the flame retardant material is a material that is not easily burned, such as flame retardant plate, flame retardant coating material, urethane PIR panel, and flame retardant styrofoam panel. Semi-combustible materials are materials that have properties similar to non-combustible materials, such as glass wool panels and general gypsum boards. Non-combustible materials are materials that do not burn, such as mineral wool panel, super F / G panel, glass, stone, steel, etc.

Conventional flame retardant materials are mainly coated with a flame retardant colored paint on an inorganic substrate such as asbestos, cement, potassium silicate, etc., or a thermosetting resin laminated and heated and press-molded. In the case of carcinogenic substances are mixed or not only to emit a gas harmful to the human body during combustion, but also the difficulty in processing has emerged as a big problem.

On the other hand, the demand and supply of wood conditioners such as Hanok have been steadily increasing in recent years, and even in general buildings, the use of interior products using wood, which is an eco-friendly material, is increasing. Because of this, compared with refractory buildings, they reach the peak in a short time, and the time to reach the peak is also fast, and the time to reach the peak after firing is about 10 minutes, and the peak period ends in about 20 minutes. In addition, after the peak period, the large pillars and sidewalks of the building collapse down soon, and the fire is rapidly weakened, leaving only the ashes remaining.

In order to make up for the shortcomings of wood, flame retardant treatment is required so that it is not easily burned. In the conventional representative flame retardant treatment technology, the method of attaching a flame retardant sheet to the surface of a wooden panel, spraying a flame retardant chemical agent on the wood, etc. The method of coating, the method of immersing wood in a flame-retardant agent under normal temperature and pressure, the method of injecting a flame-retardant agent to the center part of a wood by a pressurization method, etc. are used.

The problem with these methods is that the flame retardant sheet deteriorates when exposed for a certain time at a temperature of about 150 ° C. or higher, and thus does not exhibit flame retardancy. Since only 1-3mm is applied from the disadvantage that the flame retardancy is lost at the beginning of the fire. In addition, in case of injection of flame retardant agent by pressure treatment method, it has excellent characteristics in reducing combustion expansion in case of fire, but in case of long working time and flame retardant agent used is mixed with 3 or more organic-inorganic flame retardants, it is uneconomical. It can be said. In addition, after the flame retardant immersion, a separate drying process is required at a temperature of 50 ℃ or more, there can be a problem in the shape stability such as the shape of the wood is distorted or cracked in this process.

The present invention has been made in consideration of the above circumstances, the purpose of which has the characteristics of silicified wood, while improving the dimensional stability of the wood, and can reduce the expansion of combustion and the generation of toxic gas in the fire, the wood building material, exterior materials It is to provide a method of manufacturing a flame retardant wood with high utilization as a.

The present invention comprises the steps of allowing the treated wood to be accommodated in the pressure tank receiving portion of the vacuum pressure impregnator or room temperature atmospheric pressure impregnator to achieve the above object; Stirring the water glass or a mixed solvent of water glass and water to prepare a chemical liquid; Filling a prepared chemical into the receiving portion of the pressure tank to be impregnated with the wood to be treated; Applying a vacuum pressure to a receiving portion of the pressure tank to recover the chemical liquid; Injecting carbon dioxide into an accommodating portion of the pressure tank to be injected into the wood; Causing the inorganic material and the flame retardant to be produced in the pores of the wood part by blowing the carbon dioxide; Drying the wood by blowing the carbon dioxide; Releasing the pressure acting on the receiving portion of the pressure tank; and the water glass of the chemical liquid comprises silicon dioxide and alkali in at least one of sodium silicate and liquid water glass, which are aqueous solutions obtained by melting silicon dioxide and alkali. 100 wt% of water glass having a molar ratio of 0.5-5.1 or a mixed solvent of water glass having a molar ratio of silicon dioxide and an alkali of 0.5-5.1 mixed with water within a range of 1.0-100 wt%, containing the pressure tank of the vacuum pressure impregnator In the step of impregnating the treated wood with the chemical liquid in the part, it is maintained in the receiving tank of the pressure tank for more than 5 minutes at a reduced pressure of 0.80 bar (600 mmHg) or more to exhaust the air in the intraluminal cavity, the cell gap of the treated wood, a chemical liquid by maintaining the pressure for at least one hour at a pressure above 10.0bar (10.2kg _f / cm ²⁾ in the impregnation step of the drug solution filled into the pores in the cell lumen, the cell gap of the xylem In the step of recovering the chemical liquid, and further comprising the step of maintaining at least a pressure of 0.80 bar (600mmHg) or more at a reduced pressure in the receiving portion of the pressure tank for more than 5 minutes, the chemical liquid in the receiving portion of the pressure tank of the room temperature atmospheric pressure impregnator In the step of filling and impregnating the treated wood, injecting the chemical solution into the receiving part of the pressure tank, impregnating the treated wood for more than 24 hours at 1.0 bar (760 mmHg), 20-100 ° C. and recovering the chemical liquid. And further comprising, in the step of injecting carbon dioxide into the receiving portion of the pressure tank into the wood, comprising the step of holding the carbon dioxide blown for 3 seconds or more at a pressure of 1.0bar (760mmHg) or more in the receiving portion of the pressure tank. In addition, the inorganic carbon and the flame retardant is generated in the pores of the wood part by the carbon dioxide injection, the intracellular cavity, the cell gap, the water glass injected into the pores of the wood part and the discrete Inorganic and flame retardant materials of sodium carbonate, potassium carbonate, sodium hydrogen carbonate, potassium hydrogen carbonate, gel silicate and silicon dioxide are formed in the pores of the wood through the hardening reaction of carbon, and the flame retardant wood is The method of manufacturing a flame retardant wood comprising a process of drying the wood through the curing reaction of water glass (any one or more of sodium silicate and liquid water glass) by carbon dioxide in the step of drying the wood by blowing the carbon dioxide. In providing.

The present invention hardens the water glass absorbed in the pores of the wood part, the intracellular gap, the cell gap, and the surface through a curing reaction with carbon dioxide, and thus does not undergo a separate high temperature drying process, thereby improving the dimensional stability of the wood and generating inorganic and flame retardant materials in the wood. As the flame retardant wood has the characteristics of siliceous wood by the produced silica gel and silicon dioxide, the flame retardancy is improved, and it is possible to reduce the emission of toxic gas when burning wood. There is an economically useful effect that can be increased.

1 is a manufacturing flowchart of the present invention,
2 is a diagram of an immersion process according to the present invention.

Hereinafter, preferred embodiments will be described based on the accompanying drawings in order to help understanding of the present invention, but the following examples are not limited to the embodiments of the present invention, and various modifications and changes within the scope and spirit of the present invention are provided. Modifications are apparent to those of ordinary skill in the art. Therefore, it is also natural that the examples to which such modifications and modifications are attached belong to the claims of the present invention.

The present invention utilizes a carbon dioxide (CO ₂ ) casting method used for casting.

In the above, the carbon dioxide casting is a method of kneading by adding a water glass-based binder to the foundry sand, kneading on a model, and then molding it by passing carbon dioxide gas to cure the mold. The origin of this method is not yet clear, but it is known to have been practiced in the Soviet Union and surrounding countries. It was patented by the Czechoslovakians in England in 1949, but in December 1953 the patent expired without so much attention from the world. Since then, research has been accumulated by many researchers, making it the carbon dioxide method of today, and developing into an inorganic hard mold that does not use carbon dioxide gas.

The principle of the carbon dioxide method is generally represented by the following equation.

Na ₂ O.nSiO ₂ (mn + x) H ₂ O + CO ₂ ---> Na ₂ CO ₃ XH ₂ O + m (SiO ₂ nH ₂ O) [n is the molar ratio of sodium silicate, m is the water content of the silicate gel, x is the number of moles of crystal water of sodium carbonate]

Carbon dioxide (CO ₂ ) casting method adds sodium silicate (sodium silicate) as a caking additive to silica sand (quartz grain sand containing silicon dioxide, anhydrous silicate) so that the mold can maintain its shape during sand casting. After blowing carbon dioxide (CO ₂ ) and curing it, water glass reacts with carbon dioxide (CO ₂ ) to precipitate gel-like silicic acid (silicate gel) and exert strong adhesion, and sodium carbonate (Na ₂ CO ₃ ) When formed, it immediately absorbs water molecules, attaches them with crystal water, hardens them, and precipitates and solidifies silicon dioxide (silica, SiO ₂ ), so that sand casting can be called a method of forming castings in a free form.

1 is a flowchart illustrating a carbon dioxide (CO ₂₎ curing method Preparation of Flame Retardant Wood method having the features of the petrified wood by using according to the invention, Figure 2 is using a carbon dioxide (CO ₂₎ curing method according to the invention Diagram of immersion process related to vacuum pressure impregnation and carbon dioxide intake in the production method of flame retardant wood.

As shown here, the diagrams for the immersion process associated with vacuum press impregnation and carbon dioxide intake are shown in the following steps for receiving wood to be treated (1), exhaust gas (decompression) step (2), water glass injection step (3), pressurization step (4). ), The post exhaust (decompression) step (5), carbon dioxide blowing step (6), natural drying step (7).

At 760 mmHg, the wood is placed in the receiving tank of the vacuum pressure impregnator (1) and the pressure is reduced to 0.15-0.20 bar (112.5-150 mmHg) in the pre-exhaust stage (2) and held for 5 minutes. The air in the intracellular lumen, cell gap and surface portion of the wood to be treated is exhausted to the outside. After supplying the injection amount of sodium silicate through the water glass injection step (3) to 200-300kg / m ³ and in the pressurization step (4) to apply a pressure of 10.0-15.0bar (10.2-15.3kg _f / cm ² ) 1 Maintain time and allow sodium silicate to be injected into the lumen, intercellular space, and surface of the wood. After 1 hour, the supplied sodium silicate was recovered, the pressure was reduced to 0.15-0.20 bar (112.5-150 mmHg) in the post exhaust (decompression) step (5), and the water remaining in the wood was maintained for 1 minute. Remove by car. In the carbon dioxide blowing step (6), the sodium silicate absorbed in the intracellular lumen, cell gap, and surface of the wood was maintained for 1 hour after applying a pressure of 10.0-15.0 bar (10.2-15.3kg _f / cm ² ). Allow curing reaction to occur. In the natural drying step (7) after the curing reaction of carbon dioxide and sodium silicate is finished, the wood in the receiving portion of the pressure tank is discharged to allow natural drying at room temperature.

In the above, the water glass in the water glass injection step (3) is sodium silicate (Na ₂ O.nSiO ₂ .xH ₂ O), which is a thick aqueous solution obtained by melting silicon dioxide and alkali, and the molar ratio of SiO ₂ / Na ₂ O is 0.5. It is composed of mixed solvent mixed with water in the range of 100wt% of water glass or 1.0-100wt% of water glass with -5.1 as a stock solution.

In the step of preparing a chemical liquid after stirring the water glass or a mixed solvent of water glass and water, the chemical liquid is water glass (water glass) or a mixed solvent of water glass and water, the water glass is mainly obtained by melting silicon dioxide (SiO ₂ ) and alkali Sodium silicate (sodium silicate) is a concentrated aqueous solution. A mixture of silica sand (quartz grain sand containing silicon dioxide, anhydrous silicate) and soda ash (sodium carbonate, Na ₂ CO ₃ ) can be obtained by treating the mixture at 1,300-1,500 ° C in a low pressure steam cooker. Alkali is usually Na ₂ (in some cases K ₂ O is used), and the composition is a small amount of Fe ₂ O ₃ besides Na ₂ O.nSiO ₂ (in some cases K ₂ O.nSiO ₂ ). , Moisture is 10-30%.

Water glass to be used in the present invention is any one or more of the aqueous solution of sodium silicate (sodium silicate) and liquid water glass 100 wt% of silicon dioxide (silica) / alkali (alkali) water ratio of 0.5-5.1 or silicon dioxide and alkali It consists of a mixed solvent in which a water glass having a molar ratio of 0.5-5.1 is mixed with water within a range of 1.0-100 wt%.

The water glass is generally a soda water glass containing sodium silicate as a main component, but all materials such as potassium water glass and soda carium water glass are also classified as water glass, and generally means a substance in which silicate is dissolved in water.

The chemical composition of the silicate is generally represented by M ₂ O.mSiO ₂ . Where M is an alkali metal, Li, Na, K, Rb, Cs and quaternary ammonium bases are known, in fact, when M is Na, m = 0.54-4.0, K is m = 2.0-3.8, Li In the case of m = 3.5-7.5 and quaternary ammonium base, it is known that the molar ratio exists widely, such as m = 12-30. Among the silicates, there are various kinds of silicates such as (SiO ₄ ) ^4- , (Si ₂ O ₇ ) ^6- , (Si ₃ O ₉ ) ^6- , (Si ₄ O ₁₂ ) ^8- , and (Si ₆ O ₁₈ ) ^12- It is known to contain silicate anions.

These silicates are made by drying silica and soda ash (sodium carbonate, Na ₂ CO ₃ ) by heating and melting the mixture at a temperature range of 1,300-1,500 ° C. to make glass, and treating it in a low-pressure autoclave and colloidal silicic acid or diatomaceous earth. And sodium hydroxide are prepared by heating, reacting, dissolving, and drying them in an autoclave. The wet glass is prepared by dissolving and dissolving water in the detergent, detergent, penetrant, binder, adhesive, fire retardant, soil hardener. It is used as a raw material for refractory cement, a raw material for producing a water softener, a raw material for producing silica gel, and an egg preservative.

All of these silicate materials are silicon oxide or silica or silica. Silica and silica can be obtained abundantly as a representative mineral present on the earth, and because it is a material that can be widely supplied as a product, water glass can be given flame retardancy at low cost, and its use value is very high.

Water glass is widely used as heat-resistant, corrosion-resistant and waterproof coating material because of its high thermal stability and no pollution problem, unlike organic coatings obtained from petrochemicals. As the amount of water glass decreases, the viscosity of the solution increases sharply and has adhesive force. Thus, when the aqueous solution is treated on the surface of the material to be treated and dried, a smooth film like surface can be obtained. In addition, the water glass at the time of about 100 ℃ to 200 ℃ the separation of water molecules and the condensation polymerization reaction of silica proceeds at the same time and foamed to prevent the treated material from contact with oxygen and to perform adiabatic action to reduce the combustibility, about 500 ℃ to 700 ℃ Among them, the crystallinity is increased, and the physical properties are more solid, so it can be advantageously used to enhance the flame retardancy by being added to the combustible material. In addition, water glass is known as a low-hazardous material, and silica gel prepared by adding hydrogen cation to water glass has been widely used as a dehumidifying agent in the food industry.

In the carbon dioxide blowing step (6), the reaction mechanism for curing sodium silicate by carbon dioxide is Na ₂ O.nSiO ₂ (mn + x) .H ₂ O + CO ₂ ---> Na ₂ CO ₃ .xH ₂ O + m ( SiO ₂ · nH ₂ O) [n is the molar ratio of sodium silicate, m is the water content of the silicate gel, x is the number of moles of the crystallized water of sodium carbonate] Through this curing reaction, it is injected into the intracellular cavity, the cell gap, and the surface of the pores of the wood Sodium carbonate and gel form precipitated as silicic acid (silicate gel), showing strong adhesion, and hardening strength of wood is greatly increased by silicate gel.

The natural drying step (7) is economical because the wood is not required to be dried at a temperature above 50 ° C. by the curing reaction in the carbon dioxide (CO ₂ ) blowing step (6), and the shape of the wood is warped or cracked. It is possible to solve the problem of structural stability, thereby increasing the commodity value of fire retardant wood.

In the above description, as a preferable feature of the carbon dioxide (CO ₂ ) curing method, a curing reaction mechanism of sodium silicate and carbon dioxide, which is a kind of water glass, is mentioned as an example. Na ₂ O.nSiO ₂ (mn + x) .H ₂ O + CO ₂ ---> Na ₂ CO ₃ · xH ₂ O + m (SiO ₂ · nH ₂ O) [n is the molar ratio of sodium silicate, m is the water content of the silicate gel, x is the number of moles of crystallized sodium carbonate] Through the reaction, the water glass injected into the pores of the wood, the cell gap, and the surface of the pores of the wood are sodium carbonate (Na ₂ CO ₃ ) and the gel is silicate (silicate gel, mSiO _2). Precipitates with nH ₂ O to show strong adhesion, and hardening strength of wood is greatly increased by silicate gel (mSiO ₂ · nH ₂ O). Further, in the silica gel is a silicon dioxide type out the water molecules are located (silica, SiO ₂₎ is formed of silicon dioxide as a preserve the original shape and structure of a tree state (silica, SiO ₂₎ is a tree formed fill mokjilbuyi pore fossil It has the characteristics of phosphorus siliceous wood.

In the above, the vacuum pressure treatment of the vacuum pressure impregnator is placed in a cylindrical main medicine tube and sealed, and then pressurized into the wood with a chemical solution of pressure 5-15 kg / cm ² . Absorption amount (injection amount) is much larger than other treatment methods. In general, doses in the case of water soluble drugs 200-300kg / cm ^2, oil-based drug is 150-200kg / cm ² to the sleepers, telephone pole, harbor timber, bridge material, pit prop, landscaping material, wood noise barrier, soil anti-runoff four disaster etc. Civil engineering materials and foundations, which require long service life, are used for construction materials, container materials, and cooling towers. The basic process of the pressurization treatment is divided into the layer cell method, the co-cell method, and the anti-cell method according to the air pressure in the main tube before pressurization.

The layer cell method (Bethell method) is a method in which the drug is sufficiently injected so that the drug is filled with wood cell lumen, cell gap, etc., when a large amount of injection is required or it is applied to a species or heart treatment which is difficult to inject.

Treatment process is complete exhaust gas (15-60 minutes shaping to decompress 600mmHg or more to facilitate the injection of preservatives)-Preservative inflow (filling preservatives in the main medicine tube by depressurizing the exhaust gas)-Pressurization -Pressurized to ~ 15kg / cm ₂ -Recovery of preservative (Leave it at 30-60 minutes after depressurizing and recovering chemicals)-Post-exhaust system (Recover the remaining chemicals in wood over 600mmHg for 10-15 minutes)-Curing , The process of drying takes place.

The co-cell method (Reuping method) is a method that infiltrates the drug solution only to the cell wall and recovers the excess drug solution that enters the intraluminal cavity or the cell gap. When a small amount of injection is required, it is applied to a species or sapwood that is easy to save or to inject drugs. do.

Initial air pressure (pressure is applied only by 3kg / cm ² air pressure without chemicals to promote injection)-Preservative inflow (slowly injected to slowly escape the filled air in the main tube)-Pressurized (10- 15kg / cm ² pressure is injected for a certain period of time)-Preservative recovery (Release pressurization and withdrawal of chemical solution and leave at normal pressure for 30-60 minutes)-Post-exhaust system (Residual chemical remaining in wood over 10mm to 600mmHg) Recovery for minutes)-consists of curing and drying.

The anti-cell method (Lowry method) is a compromise method between the cell and the cell method.

The main components of vacuum pressure impregnator are main chemical pipe, metering tank, working tank, pressurized vacuum pump, and drying plant. Usable drugs are useful in both water-soluble and oil-based, and the amount of absorption of the drug solution is 150kg / m ³ or more. The infiltration length of the medicine is 100% of the sapwood part or one minute of the core material, and the advantage is that there is a large amount of absorption, there is no stained part, and the treatment effect of the drug is high. Disadvantages include in-situ treatment and expensive processing facilities due to the high equipment cost.

In the above, the main component of the atmospheric pressure impregnator is an immersion tank, and the natural absorption by capillary phenomenon is based on the principle. Usable drugs are useful in both water-soluble and oil-based, and the absorption of the drug solution is 25kg / m ³ or more. The infiltration length of the drug is less than 5mm from the surface, the advantage is that the range of absorption can be adjusted by time, easy to work and less stain. Disadvantages include partial treatment and concern for spilling of medication. It is also impossible to process existing installation materials.

The present invention is the development of flame-retardant wood having the characteristics of silicified wood is generally applied to the vacuum pressure impregnation method and room temperature atmospheric pressure impregnation method used to produce antiseptic wood, which can be said to be a big difference is the vacuum pressure impregnation of the drug (water glass) or After the atmospheric pressure impregnation, carbon dioxide is injected into wood to generate inorganic and flame-retardant materials through hardening of intracellular cavity, cell gap, and water glass on the surface of the pores of wood, and drying process by drying at a separate high temperature. It is not necessary to solve the problems such as warping and cracking of the wood and to produce a flame retardant wood having the characteristics of silicified wood.

Referring to the manufacturing process of the flame retardant wood having the characteristics of silicified wood, firstly, when the vacuum pressure impregnation method is used, the treated wood is accommodated in the accommodating part of the vacuum pressure impregnator pressure tank-a distributor (pressure 0.15-0.20 bar) to a reduced pressure after 5 minutes, while maintaining the exhaust air in the lumen of the target cell timber, a cell gap, the surface portion to the outside) for-injection water glass (sodium silicate to supply the injection amount of 200-300kg / m ³⁾ - pressing ( 1 hour after pressurizing 10.0-15.0 bar and retained for 1 hour)-Recovery of water glass (Unpressurization and recovery of water glass)-Post exhaust (water remaining in the wood while maintaining for 5 minutes after depressurizing the pressure to 0.15-0.20 bar) Is removed first)-Blowing carbon dioxide (Pressure of 10.0-15.0 bar and maintaining pressure for 1 hour)-Wood exit-Natural drying

Second, in case of using the atmospheric pressure impregnation method, the treated wood is accommodated in the accommodating pressure tank of the CMP. Impregnated with abnormal treated wood-Recovering chemical liquid-Blowing carbon dioxide into receiving tank (Pressure of 10.0-15.0 bar and maintaining pressure for 1 hour)-Wood channel-Natural drying

Thus, by using the carbon dioxide (CO ₂ ) curing method according to the present invention it is possible to obtain a flame-resistant wood having the characteristics of silicified wood.

In this way, water glass (sodium silicate, sodium silicate) is injected into the surface of intracellular cavity, cell gap, wood, which are pores of the wood by vacuum pressure impregnation method or normal temperature atmospheric pressure impregnation method, and curing reaction using carbon dioxide (CO ₂ ). It is economical because it can produce a product that has high flame retardancy and structural stability of wood, and improves the hardenability of wood by silica gel produced through hardening reaction and reduces the emission of toxic gas in case of fire. Can be increased.

1: accommodation step of treated wood 2: electric exhaust stage
3: water glass injection step 4: pressurization step
5: back exhaust (decompression) step 6: carbon dioxide blowing step
7: natural drying step

Claims (7)

Allowing the treated wood to be accommodated in a pressure tank receiving portion of a vacuum pressurizer or a room temperature atmospheric impregnator;
Stirring the water glass or a mixed solvent of water glass and water to prepare a chemical liquid;
Filling a prepared chemical into the receiving portion of the pressure tank to be impregnated with the wood to be treated;
Applying a vacuum pressure to a receiving portion of the pressure tank to recover the chemical liquid;
Injecting carbon dioxide into an accommodating portion of the pressure tank to be injected into the wood;
Causing the inorganic material and the flame retardant to be produced in the pores of the wood part by blowing the carbon dioxide;
Drying the wood by blowing the carbon dioxide;
And releasing pressure acting on the receiving portion of the pressure tank. The method of claim 1,
The water glass of the chemical liquid is at least one of sodium silicate and liquid water glass, which is an aqueous solution obtained by melting silicon dioxide and alkali, and 100 wt% of water glass having a molar ratio of silicon dioxide and alkali of 0.5-5.1 or a molar ratio of silicon dioxide and alkali of 0.5-5.1 Method for producing a flame retardant wood, characterized in that the phosphorus water glass is a mixed solvent mixed with water in the range of 1.0-100wt%. The method of claim 1,
In the step of impregnating the treated wood with the chemical solution in the receiving portion of the pressure tank of the vacuum pressure impregnator, the intraluminal lumen of the treated wood is maintained at a pressure of 0.80 bar (600 mmHg) or more for 5 minutes or more in the receiving portion of the pressure tank. Exhaust the air in the cell gap, and pressurized for at least 1 hour at a pressure of 10.0 bar (10.2kg _f / cm ² ) or more in the drug solution impregnation step to fill the drug solution into the intracellular cavity, the cell gap, the pores of the wood , The method of manufacturing a flame retardant wood, characterized in that further comprising the step of maintaining at least 5 minutes at a reduced pressure of 0.80bar (600mmHg) or more in the receiving portion of the pressure tank in recovering the chemical liquid. The method of claim 1,
In the step of impregnating the chemical liquid into the receiving portion of the pressure tank of the room temperature atmospheric pressure impregnator to impregnate the treated wood, the chemical liquid is injected into the receiving portion of the pressure tank for 24 hours at 1.0 bar (750 mmHg), 20-100 ℃ conditions The method of manufacturing a flame retardant wood, further comprising the step of impregnating the treated wood and recovering the chemical liquid. The method according to any one of claims 1, 3, and 4,
In the step of injecting carbon dioxide into the receiving portion of the pressure tank into the wood, flame retardant comprising the step of holding the carbon dioxide blown for 3 seconds or more at a pressure of 1.0bar (750mmHg) or more in the receiving portion of the pressure tank. Method of making wood. The method of claim 1,
In the step of generating minerals and flame retardant material in the pores of the wood part by the carbon dioxide injection, sodium carbonate, potassium carbonate, carbonic acid in the pores of the wood part through the curing reaction of intracellular cavity, cell gap, water glass and carbon dioxide injected into the pores of the wood part Inorganic and flame retardant materials of sodium hydrogen, potassium bicarbonate, silicate gel, silicon dioxide are produced, and the flame retardant wood has a characteristic of siliceous wood by the produced silicate gel and silicon dioxide. The method of claim 1,
In the step of drying the wood by blowing the carbon dioxide, the method of producing a flame retardant wood comprising the step of drying the wood through the curing reaction of water glass with carbon dioxide.

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