KR20080094395A - Flame retarding agent, flame retarding fiber board and method for manufacturing the same - Google Patents

Abstract

A flame retarding agent is provided to prevent a decline in characteristics of a fiber board, and to generate neither toxic gas nor smoke upon combustion. A flame retarding agent comprises 100 parts by weight of water, 1-40 parts by weight of water glass, 1-50 parts by weight of a boric acid-based compound, 1-20 parts by weight of a carbonate or bicarbonate of a group 1 alkali metal, or a mixture thereof, and 0.1-5 parts by weight of hydrochloric acid. A method for preparing the flame retarding agent includes the steps of: (i) mixing the water glass with the hydrochloric acid to prepare an aqueous solution of silicic acid; (ii) mixing water with the boric acid-based compound; (iii) mixing the prepared solution of the step (ii) with the carbonate or bicarbonate of a group 1 alkali metal, or mixture thereof; (iv) mixing the aqueous solution of silicic acid with the prepared solution of the step (iii) to form the flame retarding agent.

Description

Flame retardant, flame retardant fiber board and manufacturing method thereof {Flame retarding agent, flame retarding fiber board and method for manufacturing the same}

1 is a graph showing the behavior of SiO ₂ component in a silica solution (silica-water) such as colloid.

The present invention relates to a flame retardant, a flame retardant fiber board and a method for manufacturing the same, and more particularly, to provide a flame retardant using a sol-gel process, and to use the same to completely flame retardant that the flame retardant property can be exerted in the interior of a fiber board. It relates to a fiber board and a method for producing the same.

Recently, the use of wood in the interior and exterior materials of wooden houses and buildings is increasing rapidly, and in particular, the demand for fiberboard as an interior material is increasing every year.

Fibreboards are classified into softening boards (insulation boards), medium-density fiberboards (hereinafter referred to as 'MDF'), hardboards, and high-density fiberboards, depending on their specific gravity. Soft fiber board has a specific gravity of less than 0.4 and is used for ceiling boards, sound insulation boards, etc. Medium density fiber board is also called a semi-rigid fiber board, and has a specific gravity of 0.40 ~ 0.80, which is mainly used in the furniture industry as a substitute for plywood and cut sheet. Hard fiber board is a fiber board with specific gravity of 0.80 ~ 1.20. It is used for furniture, fixtures, cabinets, car interiors, scales for housing, and concrete forms.Ultra hard fiber board is a fiber board with specific gravity of 1.20 ~ 1.45 and its use is similar to that of hard fiber board. Do.

On the other hand, the fiber board is divided into S-2-S board and S-1-S board according to the configuration of the board, may be classified into dry, semi-dry and wet fiber board according to the foaming method.

Such fiber boards have small anisotropy, can be mass-produced, and are cheaper than general wood or plywood, so they are easily used as furniture main materials, and have a very smooth surface. . In particular, in the case of a soft fiber board, it is excellent in heat retention and sound absorption, and hardly shrinkage and expansion, which are defects of wood, such as plywood, and is also used as a substitute for wood because it is easily curved.

However, the fiber board is very weak to the holding force and impact of the screw compared to wood or plywood, and the main component is composed of organic materials such as paper, rice husk, waste wood, sawdust, etc., the low flash point is vulnerable to fire.

Therefore, the fiber board is treated as an article that must have a flame retardant performance by fire method along with papers, synthetic resins, plywood, etc., which are mainly used for interior decoration, and researches for improving the flame retardant property of the fiber plate are continuously conducted.

Referring to the conventional flame retardant fiber board manufacturing process in more detail as follows.

First of all, the raw wood is selected as a raw material and the chip cutting machine is used as a chipper to cut the shape of the chip into a chip shape, the seam processing to make the chip into a fiber shape, and to increase the water resistance and strength. Addition process of adhesive and wax, forming process for producing thick sheet mat from pulp, drying and thermopressing process to expel moisture from formed mat and forming inter-fiber bond, heat treatment It can be divided into after treatment processes such as oil impregnation treatment, humidity treatment and processing.

Thereafter, a process of injecting a flame retardant into the finished fiber board or a process of coating the flame retardant on the surface of the finished fiber board is applied to finally produce a fiber board having flame-retardant properties.

However, in the case of injecting a flame retardant into the finished fiberboard, a single flame retardant such as an inorganic flame retardant or an organic flame retardant is used, but the inorganic flame retardant has a high absorbency and causes a decrease in strength and discoloration. Disadvantages exist, and organic flame retardants emit a large amount of various harmful gases and fumes during combustion, causing fatal injuries in case of fire or incineration, and control of proper content does not reduce the flexibility, mechanical properties, durability and heat resistance of wood. Do. Therefore, a mixed flame retardant has been developed to overcome these problems, but it is also known that the synergistic effect is weak and does not play an effective role as a flame retardant.

On the other hand, in the case of coating the flame retardant on the finished fibreboard, the flame retardant properties are different depending on the local position of the fibrous plate depending on the degree of application of the flame retardant. There is a very big disadvantage that this easily spreads to the inside of the fiberboard.

Accordingly, the present invention provides a flame retardant which prevents deterioration of the properties of the fiberboard by performing a sol-gel process using a material which can be easily obtained in real life, and does not generate toxic gases and smoke during combustion, and a method of manufacturing the same. There is a purpose.

According to the present invention, after spraying or immersing a flame retardant prepared through a sol-gel process into fine powder or flakes, which is a starting material of a fiber board, the process is carried out afterwards so that the flame retardant can be exhibited not only on the surface of the fiber board but also on the inside of the fiber board. Another object is to provide a flame retardant fiberboard and a method of manufacturing the same.

Flame retardant according to the present invention with respect to 100 parts by weight of water, 1 to 40 parts by weight of water glass, 1 to 50 parts by weight of boric acid-based compound, 1 to 20 parts by weight of a carbonate or bicarbonate of a Group 1 alkali metal or a mixture thereof and 0.1 to hydrochloric acid 5 parts by weight.

And 0.1 to 10 parts by weight of potassium chloride in order to promote gelation of the flame retardant, 0.1 to 5 parts by weight of aqueous potassium hydroxide solution is further included to adjust the acidity (pH) of the flame retardant.

In this case, the boric acid-based compound includes at least one selected from the group consisting of borax, boric acid, methyl borate, ethyl borate, boric acid esters, borate minerals and derivatives thereof, for example, 1 to 20 parts by weight of boric acid and 1 to 25 parts by weight of borax. It can also be configured.

Meanwhile, the carbonate or bicarbonate of the Group 1 alkali metal or a mixture thereof includes at least one selected from the group consisting of lithium carbonate, sodium carbonate, potassium carbonate, lithium bicarbonate, sodium bicarbonate, potassium bicarbonate and derivatives thereof, for example sodium bicarbonate 1 It may be composed of 3 parts by weight and 1 to 10 parts by weight of potassium bicarbonate.

It is preferable that the acidity of the flame retardant which concerns on this invention is 4-11.

In the above-described method of preparing a flame retardant, a first step of preparing a silicic acid aqueous solution by mixing water glass and hydrochloric acid, a second step of mixing a boric acid compound in water, and a carbonate or bicarbonate salt of a Group 1 alkali metal in a solution formed in the second step Or a third step of mixing a mixture thereof, and a fourth step of mixing the aqueous solution of silicic acid with the solution formed in the third step to form a flame retardant.

In this case, the first step is mixing the water glass and the hydrochloric acid in a stoichiometric ratio of 1: 2, the boric acid-based compound of the second step may be made of boric acid and borax.

The third step consists of mixing sodium bicarbonate in the solution formed in the second step and mixing potassium bicarbonate in the solution mixed with sodium bicarbonate.

Then, between the third step and the fourth step, potassium hydroxide solution to adjust the acidity of the solution formed in the gelation promotion step and the gelation promotion step to add potassium chloride solution to promote the gelation of the solution formed in the third step It may further comprise an acidity adjustment step of adding.

On the other hand, the acidity of the solution formed in the second step is 7 to 8, the acidity of the solution mixed with sodium bicarbonate is 7 to 8.5, the acidity of the prepared flame retardant is preferably 4 to 11.

The flame retardant fiber board manufacturing method using the flame retardant described above comprises the steps of sculpting the raw material, defrosting the raw material, adding an adhesive, a curing agent and the flame retardant to the raw material, drying the raw material and forming a mat, and thermopressing the mat. , Cooling and cutting the mat, and after cooling and cutting the mat, grinding the surface of the mat, and coating the flame retardant on the mat surface.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the specification and claims should not be construed as having a conventional or dictionary meaning, and the inventors should properly explain the concept of terms in order to best explain their own invention. Based on the principle that can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention.

Therefore, the embodiments described in the specification and the drawings shown in the drawings are only the most preferred embodiment of the present invention, and do not represent all of the technical idea of the present invention, which can be replaced at the time of the present application It should be understood that there may be various equivalents and variations.

The sol-gel process is a process of synthesizing inorganic network structure by chemical reaction in solution at low temperature, and can control the composition powder's purity, particle size, shape and particle coagulation, etc. When synthesizing powders, chemical homogeneity on the atomic scale can be obtained, the addition of dopants is easy, and less grinding is required compared to powders using solid phase reactions. There are several advantages, such as enabling sintering.

Precursors required to prepare colloids in this sol-gel process consist of metals or metalloids surrounded by several ligands. The essential conditions of this starting material must be soluble in the reaction medium and must be sufficiently reactive to participate in the gel and particle formation process.

Metal alkoxides are members of the group of organometallic compounds, which have organic ligands attached to metal or metalloid atoms and are popular starting materials because they readily react with water as described in the following chemical reactions (1) and (2): It is used. In this case, the reaction is called a hydrolysis reaction because hydroxyl ions (OH ⁻ ) are attached to metal atoms, and the reaction rate and the form of the product are affected by the amount of water and the type of catalyst (acid or base).

(Wherein M is a metal or metalloid, R is an alkyl group and OR is an alkoxy group).

As described in Chemical Schemes (1) and (2), the two partially hydrolyzed molecules bind to each other through the condensation polymerization reaction described in Chemical Schemes (3) and (4) below. Due to the formation of larger polymer materials.

(Wherein M is a metal or metalloid, R is an alkyl group and OR is an alkoxy group).

That is, the sol-gel process forms larger polymer materials through hydrolysis and condensation polymerization reactions.

Therefore, the flame retardant according to the present invention is prepared using the sol-gel process as described above, the theoretical considerations thereof are as follows.

First, the flame retardant according to the present invention is based on 100 parts by weight of water, 1 to 40 parts by weight of water glass, 1 to 50 parts by weight of a boric acid compound, 1 to 20 parts by weight of a carbonate or bicarbonate of a Group 1 alkali metal or a mixture thereof and hydrochloric acid. 0.1 to 5 parts by weight, and to promote gelation of the flame retardant, 0.1 to 10 parts by weight of potassium chloride is configured to further include 0.1 to 5 parts by weight of an aqueous potassium hydroxide solution to adjust the acidity (pH) of the flame retardant.

In addition, all materials added to prepare the flame retardant have different functions to affect the flame retardant effect of the fiberboard.

First, the water glass added to the flame retardant according to the present invention has been used as a precursor of the sol-gel method up to now, is used in the preparation of spherical silicon dioxide (SiO ₂ ) and aerogels subjected to supercritical drying, and is also very adhesive It is known as a useful material and has the advantage of being very cheap.

This water glass is converted to silicic acid under acidic conditions as described in the following chemical scheme (5).

FIG. 1 shows the behavior of SiO ₂ components in silica-water such as colloids. In the case of acidity (hereinafter referred to as 'pH') 2 or less (pH <2), reaction schemes (6) and (7) The siloxane bond is formed by

That is, since the solubility of silica is very low and it is difficult to ionize in pH <2 range, aggregation of a basic particle and solvation of microparticles occur well in pH <2 range.

It can be seen that in the range near pH2 where the isoelectric point of SiO ₂ is present, the surface of the fine particles is completely neutralized and the gelation time is considerably longer. And in the range of pH2 or more and pH7 or less (2 <pH <7), condensation polymerization reaction arises by chemical reaction as described in following Reaction formula (8) and (9). This condensation polymerization reaction occurs well between species with high acidity and high condensation polymerization reaction and low pH fine particles, and gelation and aggregation of fine particles proceed with rapid increase of pH.

At pH 7 or higher (pH> 7), nucleophilic reactions occur as shown in the following chemical reaction formulas (10) and (11), and ionization of the condensation polymerization species occurs well.

In addition, it can be seen that the gelation (agglomeration) time is shortened as the amount of electrolyte that is well ionized such as sodium chloride (NaCl) or potassium chloride (KCl) increases.

Most of the silanol (Si-OH) groups are dehydrogenated at solution conditions above pH 10.5 (pH> 10.5). It can be seen that it exists in the form of ions of HSiO ₃ ^- or SiO ₃ ^-2 .

As can be seen from the above consideration, the pH of the solution can be adjusted to control the ionic state, coordination form, aggregation and gelation of the particles.

Meanwhile, boron is a trivalent ion and may be bonded to three hydroxyl groups (hydroxyl, OH) by sp ² hybrid orbit in an aqueous solution as follows. In this structure, boron atoms become electrophilic.

Therefore, the above structure has a network structure as follows through a continuous condensation polymerization reaction by OH ^- ions in basic conditions.

As shown in the network structure, the surface of the manufactured structure is surrounded by hydroxyl groups (OH), the hydroxyl group plays an important role in preventing the spread of fire by generating H ₂ O through a condensation polymerization reaction in the event of a fire. do.

In addition, the inorganic network structure as shown above is able to faithfully perform the function of the fire retardant as a rigid structure that can withstand high temperatures even in the environment of fire.

Therefore, in the present invention, by preparing a flame retardant applied to the flame retardant fiberboard based on the sol-gel chemistry of the two materials discussed above, the flame retardant does not reduce the flexibility, mechanical properties, durability and heat resistance of the fiberboard. In addition, the flame retardant is applied to a conventional fiber board manufacturing process so that it is possible to easily produce a complete flame resistant fiber board.

Hereinafter, the flame retardant according to the present invention, a method for producing a flame retardant and a method for producing a flame retardant fiber board using the same will be described in more detail with reference to the following examples.

[Example 1-Flame Retardant]

The first embodiment relates to the construction of the flame retardant according to the present invention. Specifically, hydrochloric acid (HCl) added to prepare silicic acid from 1 to 35 g of water glass (Na ₂ SiO ₃ ) and water glass with respect to 100 g of water. 0.1 to 3 g, 1 to 5 g of potassium chloride (KCl) added as an electrolyte to promote gelation of flame retardant, 1 to ₃ g of sodium bicarbonate (NaHCO ₃ ), borax (sodium borate decahydrate (Na ₂ B ₄ O ₇₎ 1 to 25 g of 10H ₂ O)), 1 to 20 g of boric acid (H ₃ BO ₃ ), 1 to 10 g of potassium bicarbonate (KHCO ₃ ), and potassium hydroxide (KOH) added in a small amount for pH adjustment Configure to

As described in the above chemical reaction formula (5), sodium chloride (NaCl) produced with silicic acid through the reaction of water glass and hydrochloric acid has a melting point of about 800 ° C and a boiling point of 1413 ° C. This delays the access to the fine powder for a significant time, which in turn delays the spread of fire.

In addition, potassium chloride (KCl) added as an electrolyte to promote gelation has a melting point of about 776 ° C. and a boiling point of 1500 ° C., thus maintaining stability up to a considerably high temperature.

Potassium hydroxide (KOH), which is added in very small amounts for pH control, promotes dehydration of wood to generate moisture, thereby increasing the flame retardant effect.

Sodium bicarbonate is pyrolyzed by the endothermic reaction (reducing the heat generated by the fire) at about 300 ° C. to release water and carbon dioxide, which are non-combustible gases, to dilute the flammable gas, thereby showing a flame retardant effect.

In addition, as disclosed in the following Chemical Reaction Scheme (12), sodium carbonate (Na ₂ CO ₃ ) generated by pyrolysis is decomposed into Na ₂ O and CO ₂ by heating, and Na ₂ O is a high temperature of 1275 ° C. Sublimation at

2NaHCO ₃ → Na ₂ CO ₃ + H ₂ O + CO ₂ (12)

According to the TGA analysis of sodium bicarbonate, sodium bicarbonate showed a weight loss of about 37% below 200 ° C., and weight loss did not occur even when the calcining temperature increased up to 1150 ° C.

This indicates that Na ₂ CO ₃ is produced by the removal of water and CO ₂ by calcining to 200 ° C by mass ratio, and sodium carbonate is present in a stable state up to a considerably high temperature.

As such, sodium carbonate (Na ₂ CO ₃ ) produces non-combustible CO ₂ and H ₂ O, which delays the ignition point of wood, and inhibits the progress of large fires because Na ₂ CO ₃ is stable even at high temperatures above 1000 ℃. It can be seen that.

Potassium bicarbonate (KHCO ₃ ) is decomposed at 100 ℃ and decomposed into carbon dioxide and water at 190 ℃ has the effect of delaying the ignition of wood.

Boric acid-based borax compounds and boric acid form an inorganic chain by B-O-B-O network structure under a basic catalyst to prevent fire access.

[Example 2-Preparation of Flame Retardant]

The second embodiment relates to a flame retardant manufacturing method according to the present invention, one specific embodiment will be described as follows.

First, in manufacturing a flame retardant for application to fiberboard, the most important point is acidity and common ionic effect.

In the case of urea resin, which is an adhesive used in the manufacturing process of fiberboard, the pH is about pH8.2, and in the case of melamine resin, it has an acidity of about pH7.85. The aqueous ammonium chloride solution, which is widely used as a curing agent, has an acidity of about pH4.5. .

Therefore, when the pressure-sensitive adhesive, the curing agent and the flame retardant are simultaneously sprayed on the wood fibers, the pH of the flame retardant should be adjusted in the range of about 4 to about 11 to form a normal complete flame retardant fiberboard.

In the method for preparing a flame retardant according to the second embodiment of the present invention, first, as described in Chemical Formula (5), water glass and hydrochloric acid are mixed in a stoichiometric ratio of 1: 2 to prepare an aqueous silicic acid solution, Boric acid compounds (one or more selected from the group consisting of borax, boric acid, methyl borate, ethyl borate, borate esters, borate minerals and derivatives thereof) are mixed.

At this time, the pH of the solution in which the boric acid-based compound is mixed in water to be included in the range of 7 to 8.

Subsequently, a carbonate, bicarbonate, or mixture thereof of a Group 1 alkali metal is mixed in a solution in which a boric acid-based compound is mixed in water.

PH at this time is to be included in the range of 7 to 8.5.

To a solution containing a group 1 alkali metal carbonate or bicarbonate, or a mixture thereof, a gelling accelerator (e.g., potassium chloride, etc.) for promoting gelation, and a pH adjusting agent (e.g., potassium hydroxide solution, etc.) for adjusting the pH are added. Mix and adjust the pH at this time within a range of about 12.

Thereafter, the flame retardant according to the present invention can be obtained by mixing the silicic acid aqueous solution and the mixed solution prepared by the above method. The pH of the flame retardant obtained is preferably adjusted in the range of 4 to 11 so as to be easily applicable to the subsequent fiber board manufacturing process.

At this time, the pH of the flame retardant is adjusted to 4 to 11 in order to prevent the adhesive strength of the adhesive from being lowered due to the flame retardant when mixing the flame retardant, the curing agent, and the adhesive according to the present invention with the raw material cut during the fiber board manufacturing process. to be.

[Example 3-Specific Example of Preparation of Flame Retardant]

The third embodiment relates to a flame retardant manufacturing method which further embodies the second embodiment of the present invention.

Hereinafter, the flame retardant manufacturing method according to the third embodiment of the present invention is as follows.

First, 35 g of water glass and hydrochloric acid corresponding to a stoichiometric ratio (1: 2) are mixed to prepare an aqueous silicic acid solution.

And, while putting borax and boric acid at the same time based on 100g of water, and stirring, increase the amount of the two components and put a borax 25g, boric acid up to 20g and stirred. The temperature at this time is dissolved while maintaining transparency to 25 ℃, pH is in the range of about 7.1 to 7.85.

According to the literature, the solubility of borax is about 6 g based on 100 g of water, and the solubility of boric acid is about 6.2 g. However, when boric acid and borax were added and stirred at the same time as in the third embodiment of the present invention, the solubility was increased. This is because OBOBO oxo bonds were generated due to the condensation polymerization reaction of the two materials at (when dissolving pure borax, the basicity was in the range of 9 <pH <9.5).

Then, 3 g of sodium bicarbonate is added to the solution in which boric acid and borax are mixed and stirred at 25 ° C. for about 10 minutes. The pH at this time slightly increased to represent 7.3 to 8.11.

Sequentially adding 10 g of potassium bicarbonate and stirring for 10 minutes to produce a clear solution while increasing the pH to 8.21 or less.

To this clear solution is added 5 g of potassium chloride to promote gelation upon mixing with the adhesive and the curing agent and stirred at a temperature of 50 ° C. for 20 minutes. At this time, the solution is transparent and the pH hardly changes.

And the pH of the transparent solution is adjusted to 12 by the addition of aqueous potassium hydroxide solution.

Thereafter, when the silicic acid solution is slowly added to the transparent solution at pH 12 with vigorous stirring, a transparent flame retardant having a pH of 11 may be obtained.

Fourth Example-Fabrication of Fiberboard with Flame Retardant Performance

The fourth embodiment of the present invention shows a method for manufacturing a flame retardant fiberboard using the flame retardant formed as in the first to third embodiments described above.

First, raw materials such as waste wood, crests, reeds, straws, and rice hulls are selected and shredded, and the seam processing is performed to produce the shredded raw materials in the form of chips. do.

Thereafter, one or more species of wood substitutes, such as waste wood sawdust, rice straw, reed, straw, rice hull, etc., are precipitated in the flame retardant according to the present invention, followed by stirring or mixing. Flame-retardant is sprayed on a mixture of one or more types of surrogate microparticles, or the raw material of wood substitutes (wood sawdust, rice straw, reed, straw, rice husk), which has flame-retardant properties by precipitating fine powder to flame retardant and drying. Form.

In addition, an adhesive and a curing agent such as urea resin, melanin resin, phenol resin, carboxymethyl cellulose and the like are sprayed on the fine powder to coat the surface of the fine powder with an adhesive component and a curing agent.

At this time, the adhesive and the curing agent may be added at the same time as the flame retardant to perform the fiber plate forming process.

That is, the above-mentioned fine powder is precipitated in a solution mixed with an adhesive, a curing agent, and a flame retardant, and then mixed by stirring, or a solution mixed with the adhesive, a curing agent, and a flame retardant is sprayed onto a mixture of fine powder, or an adhesive, a curing agent, and The fine powder may be precipitated in a solution in which a flame retardant is mixed, followed by drying to perform a fiber board forming process.

Thereafter, the fiber board is molded into a mat, and the molded fiber board is pressed by pressing at high temperature and high pressure, and then cooled and cut to prepare a completely flame-retardant fiber board having flame retardant properties.

The prepared flame retardant fibrous plate may be subjected to surface polishing through a sanding line, or may be coated with a flame retardant on both sides of the polished flame retardant fibreboard to improve flame retardant properties.

Therefore, the present invention can easily obtain a flame retardant that does not generate toxic gases and fumes during combustion by performing a sol-gel process using a low-cost material which can be easily obtained in real life, and also uses a flame retardant fiber board. The manufacturing process of the has the advantage that can be easily applied to the conventional process.

In addition, since the flame retardant fiber plate using the flame retardant according to the present invention is formed by adding a flame retardant, the flame retardant can be exhibited not only on the surface of the fiber plate but also on the inside of the fiber plate, thereby obtaining a complete flame retardant effect.

In addition, the flame retardant prepared according to the present invention is not limited to the fiber board which is a substitute material for wood, and can be easily applied to the flame retardant of various kinds of combustible materials such as waste paper, styrofoam, and fiber, thereby exhibiting excellent flame retardant effect. Of course.

The present invention has been shown and described with reference to the preferred embodiments as described above, but is not limited to the above embodiments, those skilled in the art without departing from the spirit of the present invention. Various changes and modifications will be possible.

Flame retardant according to the present invention can be easily obtained by performing a sol-gel process using a low-cost material that can be easily obtained in real life, it does not generate toxic gases and smoke during combustion, it is applied to fiberboard When manufacturing a flame retardant fiber board has the advantage that the mechanical properties, durability and heat resistance of the fiber board is not lowered.

In addition, it is easily applied to the manufacturing process of the conventional flame retardant fiber plate, the process can be further simplified, there is an effect that can improve the process yield.

The flame retardant fiber board using the flame retardant according to the present invention can exhibit a flame retardant property not only on the surface of the fiber board but also on the inside of the fiber board, thereby having a remarkable effect of obtaining a complete flame retardant effect.

Claims (19)

Per 100 parts by weight of water, Water glass 1 to 40 parts by weight; 1 to 50 parts by weight of a boric acid compound; 1 to 20 parts by weight of a carbonate or bicarbonate of a group 1 alkali metal or a mixture thereof; And 0.1 to 5 parts by weight of hydrochloric acid; Flame retardant comprising. The method of claim 1, Flame retardant further comprises 0.1 to 10 parts by weight of potassium chloride to promote the gelation of the flame retardant. The method of claim 2, Flame retardant further comprises 0.1 to 5 parts by weight of an aqueous potassium hydroxide solution to adjust the pH (pH) of the flame retardant. The method of claim 1, The boric acid-based compound is a flame retardant comprising one or more selected from the group consisting of borax, boric acid, methyl borate, ethyl borate, boric acid esters, borate minerals and derivatives thereof. The method of claim 4, wherein The boric acid compound is 1 to 20 parts by weight of boric acid; And Flame retardant consisting of 1 to 25 parts by weight of borax. The method of claim 1, Flame retardant comprising at least one selected from the group consisting of lithium carbonate, bicarbonate, or a mixture thereof, lithium carbonate, sodium carbonate, potassium carbonate, lithium bicarbonate, sodium bicarbonate, potassium bicarbonate and derivatives thereof. The method of claim 6, Carbonate, bicarbonate or a mixture thereof of the Group 1 alkali metal may include 1 to 3 parts by weight of sodium bicarbonate; And Flame retardant containing 1 to 10 parts by weight of potassium bicarbonate. The method of claim 3, wherein Flame retardant acidity of the flame retardant is 4 to 11. A first step of preparing a silicic acid aqueous solution by mixing water glass and hydrochloric acid; A second step of mixing the boric acid compound in water; A third step of mixing a carbonate, bicarbonate, or mixture thereof of the Group 1 alkali metals with the solution formed in the second step; And A fourth step of forming a flame retardant by mixing the aqueous solution of silicic acid and the solution formed in the third step Flame retardant manufacturing method comprising a. The method of claim 9, The first step is a flame retardant method of mixing the water glass and the hydrochloric acid in a stoichiometric ratio of 1: 2. The method of claim 9, The boric acid-based compound of the second step is a flame retardant manufacturing method consisting of boric acid and borax. The method of claim 9, The third step, Mixing sodium bicarbonate with the solution formed in the second step; And Flame retardant manufacturing method comprising the step of mixing potassium bicarbonate in the solution mixed with sodium bicarbonate. The method according to claim 9 or 12, Between the third step and the fourth step, A gelation promoting step of adding potassium chloride solution to promote gelation of the solution formed in the third step; And Flame retardant manufacturing method further comprises the step of adjusting the acidity of the potassium hydroxide solution to adjust the acidity of the solution formed in the gelation step. The method of claim 12, The acidity of the solution formed in the second step is 7 to 8 flame retardant manufacturing method. The method of claim 12, The acidity of the mixed solution of sodium bicarbonate is 7 to 8.5 flame retardant manufacturing method. The method of claim 13, The acidity of the flame retardant is 4 to 11 flame retardant manufacturing method. Flame retardant fiber board manufacturing method using the flame retardant of claim 8, Cutting raw materials; Defrosting the raw material; Adding an adhesive, a hardener and the flame retardant to the raw material; Drying the raw material and forming the mat; Hot pressing the mat; Cooling and cutting the mat; Flame retardant fiber board manufacturing method comprising a. The method of claim 17, After the step of cooling and cutting the mat, Grinding the surface of the mat; Coating the flame retardant on the mat surface; Flame retardant fiberboard manufacturing method further comprising. Fire retardant fiberboard produced by the method according to claim 18.

Images