KR101314741B1 - Manufacture method of inorganic foam using magnesia and its hardner at room temperature - Google Patents

Abstract

The present invention is to provide a foamed water containing fine bubbles in the magnesium oxide and its curing agent and then mixed with it to cure into a magnesium cured body of the foam (Foam) state containing a large amount of fine bubbles by a hydration reaction, such as insulation, fireproofing and soundproofing materials It relates to a high-strength non-combustible room temperature inorganic (inorganic) foam molded article that can be used for the purpose of.
The high-strength non-combustible room temperature inorganic foam molded article disclosed herein includes a foaming agent dilution step of diluting a foaming agent which is a source of bubbles to provide a large amount of microbubbles to the inorganic molding; Bubble generation step for generating a large amount of fine bubbles of the diluted foam agent; A slurry manufacturing step of magnesium oxide for providing magnesium oxide powder, which is a starting material of an incombustible inorganic foamed molded product, to have fluidity in an aqueous condition; Dilution of the magnesium curing agent dissolving the curing agent of magnesium oxide in water; Mixing the bubble water made in the bubble generation step with the magnesium oxide slurry made in the manufacturing and supplying the magnesium oxide slurry and the diluting hardening agent made in the dilution and supplying step so that a large amount of fine bubbles are provided inside the inorganic molded body with a uniform distribution. step; A molding step for transferring the slurry in which the magnesium oxide, its hardener and the microbubbles are uniformly mixed into a mold in a shape of a predetermined shape; The present invention relates to a method for producing an inorganic foamed molded article including a drying step for removing water contained in the molded article.

Description

Manufacture method of inorganic foam using magnesia and its hardner at room temperature}

The present invention is to provide a foamed water containing fine bubbles in the magnesium oxide and its curing agent and then mixed to form / harden the magnesium cured body of the foam (Foam) state containing a large amount of micro bubbles by the hydration reaction to insulate, fire and The present invention relates to a high-strength inorganic foamed molded article that can be used for soundproofing materials.

The high-strength non-combustible inorganic foamed molded article disclosed herein is a three-dimensional magnesium in the foam (foam) state containing a large amount of microbubbles by hydration reaction when mixed with a magnesium oxide and a bubble water containing fine bubbles in the curing agent thereof The present invention is to provide a high-strength non-combustible inorganic foamed molded article that can be cured with a hardened body of an inorganic network macromolecule and can be used for thermal insulation, fireproofing, and soundproofing.

Polymer insulation materials such as petrochemical products, such as styrofoam and foamed polyurethane foam, which are widely used today, not only cause fatal injury due to the release of toxic gases in the event of fire, but also have the problem of accelerating the pollution of the air. In case of fire, there is an advantage of providing incombustibility in case of fire, but it is possible to be the main culprit of global warming by emitting large amount of carbon dioxide (CO ₂ ) due to the high temperature above 1,000 ℃ in the manufacturing process. Because of the need for energy, the company's competitiveness can be reduced, and in some cases, it can cause fatal problems for respiratory diseases.

The applicant of the present application recognizes the above problems, and has continued many efforts and studies to improve them. As a result of the research, the manufacturing method of the ultralight cement insulation material (application number 10-2010-002417) has been patented, and the geopolymer Patents have been applied for a method for producing an inorganic foamed molded article using the method (application number: 10-2010-0114664) and a method for producing an inorganic foamed molded article using the geopolymer and silica sol.gel method (application number: 10-2010-0114665) The present invention has been completed in the course of conducting research to obtain an inorganic insulating material having better physical properties.

In Korea, where most of the energy depends on imports, 25% of the total energy consumption is used in the building, so the energy saving problem in the building is very important. In order to provide a comfortable living environment, heat insulation and soundproofing are excellent, and insulation and soundproofing materials that do not harm the human body and the atmosphere caused by the emission of harmful gases are required.

In this way, the inorganic foam material provided herein as a means for preventing heat loss and blocking noise while reducing human injury and damage to the air environment due to a fire occurrence is composed of fine bubbles between the inorganic particles, so that the thermal insulation effect as well as the sound insulation effect It provides excellent insulation and sound insulation while preventing convection during heating and cooling processes, and also ensures non-combustibility in the event of fire as the foam molded body is composed of inorganic materials, greatly reducing the damage to human life and atmospheric environment. It is expected to be.

Insulation may be defined as minimizing or stopping heat transfer, which is a flow of energy, by a temperature difference T, and a material required for this is called insulation.

All insulation materials are provided to increase the insulation effect while providing light weight by allowing a large amount of fine porous materials with low thermal conductivity to exist inside the molded body through a process suitable for organic and inorganic materials. It is preferable that the closed cell has a small independent bubble and contains a large amount of uniform bubble film, thereby minimizing the energy flow due to the temperature difference by the closed cell having low thermal conductivity. It is possible to provide a heat insulating material having a low thermal conductivity.

In general, the insulators on the market are light weight and have a low heat transfer rate, and the air layers are composed of organic and inorganic materials, and foam polystyrene, glass wool, foam polyethylene, polyurethane foam, vermiculite, and perlite ( Perlite), urea foam, cellulose insulation, soft fiber board, phenol foam and aerogel are commercialized, and many researches and developments are being carried out to obtain a heat insulating material having durability and excellent insulation effect.

Among the insulation materials, foamed polystyrene has high insulation effect and light weight, and is excellent in transportation and construction, but the highest safe operating temperature is 70 ℃, it is weak to ultraviolet rays and can be fatal to human body because of high risk of ignition or toxic gas in case of fire. In the case of, the air layer sealed between the glass fibers forms a heat insulating layer, and in addition to the heat insulating property, it is excellent in non-combustibility and sound absorption, the effective thickness may be reduced by compression or settlement, and the heat insulation may be reduced by water. In the case of foamed polyethylene, the foamed polyethylene and the flame retardant are blended and extruded into a polyethylene resin, and then laminated and heat-sealed with a cooled plate-shaped foaming agent. Excellent thermal insulation effect because the thermal conductivity of the phase is less than 0.039 kcal / mh ℃ However, the highest safe operating temperature is 80 ℃ and it is toxic to human body by emitting toxic gas in case of fire.

Polyurethane (polyol), polyisocyanate (foaming agent), foaming agent, and additives for flame retardancy include polyurethane, and the insulating material of the foamed organic foam (independent bubble structure) has better heat resistance than heat resistance (maximum safe operating temperature of 100 ° C). It is suitable as a cold storage material such as a refrigeration machine, but it has the disadvantage that the volume decreases after construction and the thermal conductivity is lowered. This also has the disadvantage that toxic gas is released in the same way as other foamable polymer materials in case of fire.

Although it is expanded after calcining ore such as vermiculite or perlite at high temperature of 1000 ℃, lightweight aggregate and insulation made of lightweight spherical small particles with micropores inside are effective for keeping warm and absorbing. In order to foam minerals such as perlite, a high energy source of 1,000 ° C. or higher is required.In the case of aerogels, structures with a thickness of 10,000 parts of hair are entangled like cotton candy, so that the air hole occupies 95% of the total volume. It has the advantage of excellent soundproofing and soundproofing, but it is very expensive and it is limited to some high-tech industries.

As such, the foamed materials developed so far have a high risk of causing toxic chemical harm in the event of a fire in case of fire, and can accelerate environmental pollution. In the case of ceramics, a high temperature of 1,000 ° C. or higher is required. Because of the high energy loss and the need for many facilities for compression molding in a certain frame or the high price like aerogel, it not only loses the price competitiveness but is limited in various fields as a building insulation material for energy saving. It is used.

Therefore, in order to protect energy in the environment and to secure price competitiveness during the manufacturing process, more research may be needed than now.

Looking at the related technology presented as a means for solving the problems of the above insulating material, Korean Patent Laid-Open Publication No. 2005-0033352 discloses a crystalline aluminosilicate inorganic insulating material based on sodium metasilicate and alumina cement as a basic skeleton, Although there is a prior art presenting a non-combustible insulation composition, a heat insulating material using the same, and a method of manufacturing the same, which dissociate carbon dioxide bound to sodium bicarbonate by adding metaphosphoric acid to sodium bicarbonate and generate carbon dioxide bubbles. If the mixing agent is provided with a bubble water containing fine bubbles, it will be completely different from the configuration of curing with a magnesium cured body in a foam state containing a large amount of fine bubbles.

In Korean Patent Publication No. 2007-000033447, a vegetable or animal foaming agent is included in an aqueous solution and foamed first, and then ceramic powder, silicate, and additives are added to prepare a microporous ceramic slurry. Providing a gelling step to provide a foamed ceramic manufacturing method to form a large amount of micro-foamed foam by drying and curing while maintaining the original shape of the foam without disappearing foam, but using a foaming agent as in the present invention While the technical configuration may be considered to be somewhat similar, the above-described patent is a method of forming a three-dimensional network using a silica sol-gel method, whereas the present invention includes a fine bubble containing magnesium oxide and a curing agent thereof. Provides bubble water and contains a large amount of fine bubbles by hydration The form may be quite different from the mechanism of curing by (Foam) state.

Korean Patent Laid-Open Publication No. 2010-0045114 discloses an inorganic material obtained by rapidly heating glass rocks with gas or electricity to vaporize crystal water and an auxiliary material obtained by stirring water glass (Na ₂ 0 · SiO ₂ ), flame retardant, antimony, and polyvinyl acetate (PVA). The mixture is molded in a mold and thermally cured, wherein the mixing ratio of the inorganic foam and the auxiliary material is 2: 1, and the auxiliary material is 65 to 70% by weight of water glass, 27.5 to 32.5% by weight of flame retardant, 2.48 to 3.0% by weight of antimony, and PVA 0.01 To present a non-flammable inorganic insulation prepared by stirring at a ratio of 0.0 to 0.02% by weight, in the present invention, in order to remove moisture contained in the molded body is heated at room temperature or very low temperature, while in the present invention using a gas or an electric furnace By selecting a very high temperature heating range where the crystallized water can vaporize, it is very inconsistent with the technical idea of the present application. In addition, the technical spirit may be different, including technical components.

In addition, Korean Patent Publication No. 2010-0120728 prevents damage caused by volatile organic compounds (VOCs) and has excellent heat resistance to prevent the spread of fire as a nonflammable material, and to replace existing heat insulating materials with excellent dust, soundproofing, and heat insulating properties. The ball panel composition has been proposed. In the cited invention, the binder uses a high molecular material epoxy, which may result in fatal human injury caused by a large amount of toxic gas in the event of a fire. You can see the difference.

US Patent No. 7,347,896 B2 discloses a reactive oxidation comprising magnesium oxide, magnesium sulfate, and ammonium phosphate monobasic as a curing agent in magnesium oxide (MgO) similar to the present invention. Disclosed magnesium cement, the present invention overlaps with the inclusion of magnesium oxide and its curing agent, as in the invention cited above, in the case of the invention cited when the magnesium oxide and its curing agent in contact with water conventional portland cement While the present invention is merely a simple inorganic molded product that is cured by a hydration reaction, the present invention uses the mechanism of the cited invention as described above to produce a shaped body composed of fine foams, but the inorganic molding of a heat insulating material and a soundproof material containing fine bubbles. By producing a foam, which is completely different from the invention It can be called a mechanism.

In addition, U. S. Patent No. 5,645, 637 discloses a mixture of magnesite foamed cement comprising a step of mixing a magnesium salt selected from the group consisting of water, magnesium oxide, magnesium chloride and magnesium sulfate and a carboxylic acid and salts thereof, similarly to the present invention. As described above, in the present invention, a linear saturated or unsaturated alkyl group having 10 or more carbon atoms as a foaming agent (for example, decanoic acid, nonanoic acid, octanoic acid, 2-ethylhexanoic acid, heptanoic acid, hexanoic acid, pentanoic acid, 3 organic acids with -methylbutanoic acid, 2-methylpropanoic acid, butanoic acid, propionic acid, acrylic acid, methacrylic acid, cyclohexylcarboxylic acid, benzoic acid, 4-t-butylbenzoic acid, and 4-n-butylbenzoic acid) And a mixture of magnesite foam cement made by Ca salt, the present invention is foamed to magnesite cement In order to improve the strength, water resistance, and durability, an organic acid (eg, acrylic acid) and an initiator are mixed together, and an attempt is made to improve the physical properties of the magnesite cement by generating a polymer by a condensation reaction. There is no recognition that a high-strength non-combustible inorganic foamed molded article containing a large amount of bubbles is contained, and the above-described configuration does not include a foaming agent capable of providing a fine amount of foaming force.

In order to obtain other ALC, the mixture made by adding foam and cement to the foamed concrete in high temperature and high pressure steam cured lightweight foam concrete should be steam cured at high temperature and high pressure (temperature: about 180 ℃, pressure: 10 kg / ㎠). Therefore, a huge equipment cost is required, and a large curing period is required to manufacture a lightweight bubble cement, not only is it less competitive, but also has a problem that the heat insulation effect is not high as the specific gravity is more than 0.5 g / cm 3.

Although the research and development of inorganic foamed molded products provided in the low temperature range of 200 ~ 300 ℃ has been continued, the production process is simple and the development and production of foamed molded products for commercialization as insulation and sound insulation after foam molding at room temperature is still satisfactory. When the inorganic foamed molded article is not reached in the low temperature range and has low binding strength between inorganic particles, the durability and water resistance are very low. In order to overcome the need for energy to raise above 1,000 ℃ can adversely affect the air environment, and there is a problem that can worsen the competitiveness of the company, to solve the problems of these inorganic insulation and sound insulation materials Advanced technology is needed.

In the case of the conventional non-combustible inorganic foamed body is composed of inorganic materials in the event of a fire, the toxic gas is not released at all, it has the advantage that can greatly reduce the damage and protect the atmospheric environment, but a lot of fine bubbles In order to achieve the shape of the inorganic material, high energy is required because it can be heated only at a very high sintering temperature, and as the manufacturing process of the foamed molded body is complicated, the workability and price competitiveness are low, and the global warming can be accelerated. The invention started with the problem to solve the problem.

In addition, the present application in order to solve the problem of energy when providing a conventional inorganic foamed body, even if the technology to produce a low specific gravity inorganic body in a relatively low temperature range is introduced, the inorganic body is not only binding force but also water resistance It is an invention started with the problem to solve the problem of not being able to maintain the shape continuously for a long time as the inorganic insulation and sound insulation material greatly lacked.

The present application does not require a large reaction device such as an autoclave and a long time reaction condition for curing, such as when manufacturing a cement insulation material such as conventional ALC (Autoclaved Lightweight Concrete), and without the polymer binder as in the prior art It is an object of the present invention to provide an inorganic foamed molded article having excellent compressive strength as well as water resistance using an inorganic binder and a method of manufacturing the same.

In addition, the present application is a high-strength non-combustible room temperature inorganic (Inorganic) foam that can be used as a heat insulating material, a fireproof material and a soundproofing material to replace the flammable foamed polymer resin or ALC lightweight foam concrete provided by conventional petrochemical products It is intended to provide a molded article.

The technical idea of the present application is that when it comes into contact with the number of bubbles containing fine bubbles in magnesium oxide and its curing agent, it is cured into a magnesium cured body by maintaining a foam state containing a large amount of fine bubbles by hydration reaction, and thus insulation, fireproofing and soundproofing materials. In order to obtain a high-strength non-inflammable inorganic foamed molded body that can be used for such purposes, Sorel (Melcia Cement) in 1867, Sorel (mixing) of magnesium oxide and magnesium chloride solution is made very good cement It was announced.

These types of cements have been known by various names such as Sorel, Magnesite and Magnesium oxychloride cement. Currently, magnesia cement is made of magnesium oxychloride mixed with magnesium oxide and magnesium chloride solution. Magnesium phosphate cement formed by mixing with oxychloride (MOC), magnesium oxide and magnesium sulfate solution (magnesium oxysulfate, called MOS) and magnesium oxide and ammonium monophosphate solution cement, MAP), and when magnesium oxide and its curing agent are mixed, it hardens within a few seconds to several ten minutes to form magnesia cement.

Magnesium oxide (MgO), which is used in magnesite cement, is also called Goto. It has white powder melting point of 2,800 ℃ and specific gravity of 3.65. Magnesium oxide dissolves in water and shows alkalinity and easily reacts with acid. It becomes salt, but it is not easy to pyrolyze and return to MgO relatively easily.

This fact is smaller than Mg ²⁺ , Ca ²⁺ or Ba ²⁺ , and it is because it attracts O ² and electrostatically strongly and makes a hard crystal lattice. It has a very high melting point and is used as a raw material for refractory bricks and crucibles. According to the present invention, it can be seen that it is very preferable as a raw material of the high-strength nonflammable fireproofing material and the soundproofing material of the present invention.

The present invention is to provide a foamed water containing fine bubbles in the magnesium oxide and its curing agent and then mixed with it to cure into a magnesium cured body of the foam (Foam) state containing a large amount of fine bubbles by a hydration reaction, such as insulation, fireproofing and soundproofing materials It relates to a method for producing a high-strength nonflammable room temperature inorganic (Inorganic) foam molded article that can be used in the.

The manufacturing method of the inorganic foam molded article provided to be used for the use of insulation, sound insulation, fire retardant, etc. in a foam state containing fine bubbles by using the magnesium oxide and the curing agent thereof disclosed herein is a large amount. Diluting the foaming agent, which is the source of the foam, to provide the micro-bubbles to the inorganic molding, and the foaming step using the foaming means to form a large amount of micro-bubbles with the diluted foaming agent and oxidation as the starting material of the non-combustible inorganic foamed molding In order to give magnesium powder fluidity under aqueous conditions, the slurrying step of magnesium oxide and the dilution step of magnesium curing agent dissolving the curing agent of magnesium oxide in water and the bubble water and magnesium oxide slurry and dilution curing agent prepared in the bubble generation step Mixing step and magnesium oxide and its curing agent and fine bubbles To obtain a mixed slurry one with a constant shape is the invention to be obtained inorganic foamed molded article as made comprises a drying step for removing the moisture contained in the molded article inside the molding step and into the mold (mold).

In the method for preparing an inorganic foamed molded article at room temperature using the magnesium oxide of the present application and the foaming agent dilution step, although a small amount of foaming agent is included, it is advantageous to generate a large amount of microbubbles by the foaming step. Alkyl sulfonates, alkylbenzene and alkylamino acid salts, alkyl ether carbonate salts, acylated peptides, sulfated oils, alkyl sulfates, alkyl ether sulfates, alkyls using amino acid-based surfactants or petrochemical industries One or more surfactants selected from arylether sulfate, alkylamide sulfate, alkylphosphate, alkyletherphosphate and alkylaryletherphosphate may be used alone or after dilution with water.

At this time, the water is a tap water, without particular limitation, except for water containing a large amount of alkaline earth metals that can lower the foaming force in the case of hard water containing a large amount of calcium (Ca ^{2 +} ) and magnesium (Mg ^{2 +} ) ions. Groundwater and industrial water can be used.

The foaming agent does not deflate the foamed foam, and it is advantageous to use animal foaming agent for long-term maintenance, but in the case of animal foaming agent, there is a disadvantage that similar smell occurs. It may be advantageous to use a vegetable foaming agent.

The addition amount of the foaming agent may be added 0.1 to 5.0 parts by weight based on 100 parts by weight of water, preferably 0.25 to 4.5 parts by weight, more preferably 0.5 to 4.0 parts by weight, most preferably It is advantageous to mix 1.0 to 3.5 parts by weight. If the foaming agent is contained in an amount of 0.1 parts by weight or less, the foaming power is low, so it is unlikely to form fine porous bubbles. Has the disadvantage of not providing an excellent inorganic heat insulating agent, and when the foaming agent is diluted to more than 5.0 parts by weight, it can form a large amount of fine bubbles can provide an inorganic heat insulating material with excellent thermal insulation and soundproofing effect. However, since the foaming agent is composed of organic materials, the bonding strength between the particles and the particles is lowered and thus the physical properties of the final inorganic foamed molded product It may be detrimental, and since the price of the foaming agent is generally expensive, there is a problem that the price competitiveness may be lowered.

The bubble generation step for generating a large amount of fine bubbles is not particularly limited, it may be irrelevant if the solution provided by the foaming agent dilution step can generate a large amount of fine bubbles.

The step of generating micro-bubbles is selected from a mixer, a dissolver, and a homer mixer, in which a rotor blade is mounted from the same axis of the motor and stirred by a rotation speed of 500 to 12,000 rpm. One type of stirrer may be used, or a compressed air of a compressor and a foamer equipped with a nozzle may be used.

In this case, when a small amount of foamed bubbles is required, it is advantageous to use a foaming method using a rotary blade mounted from the shaft of the motor, and when a large amount of foamed bubbles is required, it is preferable to use a foamer equipped with a compressor. .

The magnesium oxide slurry production step is to provide fluidity by supplying moisture to the powdered magnesium oxide, and because the magnesium oxide, the inorganic starting material of the present invention is a powder, not a powdered state and a water-soluble magnesium oxide When the curing agent is mixed, it hardens in a very fast time during the mixing process and does not have workability to have a foamed molded product, and maintains a slurry state mixed with water as possible because it cannot provide uniform bubbles during mixing with bubble water. It is desirable to.

Magnesium oxide slurry is heated by calcining magnesium carbonate (MgCO ₃ , magnesite) at a temperature of 700 ° C or higher at a light burned magnesia or dolomite (Dolomite, MgCO ₃ · CaCO ₃ ) at a calcination temperature of 800 ° C or higher. Magnesium ions dissolved in a mixture of MgO and CaO or seawater produced by decomposing or reacting with sodium hydroxide, calcined lime, calcined dolomite, etc. are precipitated with magnesium hydroxide and then calcined at a temperature of 700 ° C. or higher. Magnesium may be used as a main raw material, and when the magnesium oxide is 100 parts by weight, 25 parts by weight to 500 parts by weight of water may be supplied and then uniformly mixed to prepare a slurry of magnesium oxide. Parts to 400 parts by weight of water are supplied, more preferably 100 parts by weight to 250 parts by weight Since it is advantageous to supply negative water, it may have a great advantage that a high-strength inorganic molded body can be manufactured because water is supplied in a small amount when water is supplied at 25 parts by weight or less, but many times during the mixing process for preparing a slurry It has the disadvantage of overpowering, and when water is supplied over 500 parts by weight, it has the advantage of reducing the time and power to prepare a slurry of magnesium oxide as the amount of water is supplied, but it is weak in durability. As a disadvantage, it is preferable to add the above-mentioned water to make a slurry of magnesium oxide.

In addition, the magnesium oxide powder used to prepare the slurry of magnesium oxide may be a powder of 0.1 ㎛ ~ 0.25 mm size, preferably 0.5 ~ 100 ㎛ size, more preferably 2.5 ~ 75 It is advantageous to use a powder having a size of µm, and most preferably to use a powder having a size of 10 to 50 µm, in which a mixture of magnesium oxide and a curing agent thereof forms a certain shape by hydration reaction. When the particle size is 0.1 μm or less, the weight ratio is low, so the probability of uniform dispersion in the bubble water produced in the bubble generation step is high, and the activity of magnesium oxide with the curing agent is high, thereby providing an excellent inorganic shape with high durability. However, it has the disadvantage of requiring a lot of manpower and expensive grinder in the grinding process to provide fine particles. And, when the particle size is 0.25 mm or more has the advantage that the price is low, but the specific surface area is low, the reaction activity with the curing agent of magnesium oxide is low to provide a high-strength inorganic molded by the hydration reaction of magnesium oxide according to the present invention It is desirable to provide a powder of the size proposed above because it has the disadvantage of difficulty.

The dilution step of the magnesium curing agent dissolving the curing agent of magnesium oxide in water provides water solubility for uniform mixing of the slurry of magnesium oxide prepared in the slurry step of magnesium oxide with the bubble water and the curing agent made in the bubble generating step. For this purpose, a hardening agent of magnesium chloride for producing an inorganic form of magnesium oxychloride (MOC), a hardening agent of magnesium sulfate for producing an inorganic form of magnesium oxysulfate (MOS), A hardening agent of ammonium phosphate monobasic may be selected and used to generate an inorganic form of magnesium phosphate cement (MAP), and the dilution ratio is different because the curing agents of magnesium oxide have different solubility. May be water, preferably To 10 naejineun being diluted with 125 parts by weight it is advantageous when the amount of the reference portion.

In the case of the first ammonium phosphate among the curing agent of magnesium oxide, a phosphate selected from diammonium phosphate including ammonium phosphate, sodium phosphate dibasic, sodium phosphate dibasic, potassium phosphate dibasic, potassium phosphate dibasic, and phosphoric acid; Phosphoric acid-based hardeners can be used together, and these phosphate-based hardeners harden within seconds to several tens of seconds when mixed with a slurry of magnesium oxide. 1 type selected from sugar, boric acid, borax, citric acid, sodium citrate, sodium gluconate, tartaric acid The above retardant may be used in an amount of 1.0 to 7.5 parts by weight based on 100 parts by weight of the phosphoric acid-based curing agent. There is a problem in that there is no time to prepare a constant inorganic shape by curing (setting), and when the retardant is included in more than 7.5 parts by weight, the curing time can be extended for a long time has the advantage that workability is greatly improved, but inorganic type Since the durability of the upper body is greatly reduced, it is preferable to include the retarder of the above-mentioned concentration.

The mixing step is not particularly limited, and may be possible by uniformly mixing the bubble water made in the bubble generating step and the magnesium oxide slurry made in the manufacturing and supplying magnesium oxide slurry, the diluted hardener made in the dilution and supplying step of the curing agent. .

The molding step is not particularly limited, and may be possible by molding to the shape of the size required for insulation and sound insulation.

The heating step is to dry the inorganic molded body by using a heating method selected from near-infrared heating method, infrared heating method, room temperature drying method, heating method by microwave, hot air heating method by oven, hot plate direct heating method. In the case of drying a relatively thin ultra-light foam molded article, it is preferable to use a near-infrared heating method, an infrared heating method, a room temperature drying method, a hot air heating method by an oven, or a hot plate direct heating method. In the case of a large ultra-light inorganic foam molded article, irradiation with microwave at 2,450 MHz provides the heat of vibration of water molecules that are as polar as the microwave, and uses microwave to remove moisture contained in the molded article at a very high speed. It is preferable to use a method (aka microwave).

The functional additive supplying step is a process in which an additive is supplied to impart functionality to the inorganic foamed molded product or to improve physical properties. The functional additive supply step may provide anion or far infrared rays or impart functionality to adsorb harmful gases to improve indoor environment. It can provide improved physical properties of the inorganic foamed body for improving tensile strength and water resistance.

In order to impart functionality to generate anions or far infrared rays in the inorganic foamed product provided herein, gannetite, ocherite, olivine, kaolin, metakaolin, silicate minerals of 400 μm or less in size Diatomite, Wollastonite, Pyrophyllite, Dolomite, Lithium Minerals, Magnesite, Bauxite, Bentonite, Pumice, Borate Borate, Serpentine, Acid clay, Iron Oxide, Garnet, Carbonate Minerals, Attapulgite, Zeolite, Sepiolite ), Nephrite, Apatite, Illite-Mica, Feldspar, Perlite, Vermiculite, Zeolite, Barite, Talc ), Diatomaceous earth, graphite, Hectorite, Clay Minerals, Zirconium Minerals, Titanium Minerals, Tourmaine, Tourmaine, Fume silica, Aerogel, Fly Ash ( At least one ceramic powder selected from fly ash) is included, and activated carbon and activated carbon fiber having a specific surface area of 700 to 1,800 m 2 / g can be provided for adsorption of harmful gases existing in the room. In the case of containing a large amount of ceramic powder or activated carbon or activated carbon fiber to impart functionality, the bonding strength of the inorganic foamed molded product according to the present invention may be lowered. It may be added and applied in the range of 75 parts by weight.

Inorganic moldings have very high compressive strength but are fragile due to their inherent physical properties, and have a weak flexural strength. Therefore, fibers are added to impart functionality to improve the physical properties of the cracking and bending strength of the inorganic foamed molded article prepared by the present invention. At this time, the added fiber is composed of fibers to grab the particles and particles in the heat insulating material may be any of natural fibers or artificial fibers.

In the case of natural fibers, cellulose fibers (seedling fibers, bast fibers, salt vein fibers, fruit fibers), staples, or filament-like protein fibers or mineral fibers may be included, and artificial fibers may include organic fibers (regenerated fibers, semisynthetic fibers). Fibers, synthetic fibers) or inorganic fibers (metal fibers, glass fibers, rock fibers, slag fibers, carbon fibers).

The thickness of the fibers for improving the physical properties of the present invention is advantageously 3 to 50 μm, preferably 5 to 25 μm, and most preferably 5 to 10 μm, 3 μm. Although the fibers of the following thickness have the characteristics of being smoother in appearance and softer to the touch due to the characteristics of the fibers, they have excellent physical properties and high utilization value. Because of having the above thickness has the disadvantage of lacking the option to add the fiber, the fiber having a thickness of 50 ㎛ or more is not smooth in appearance, and generally has the disadvantage that the strength is lower than the fine fiber in the above range It is preferable to use a fiber having a thickness of.

The length of the fiber is advantageously 1 to 50 mm, more preferably 5 to 35 mm, and most preferably 10 to 25 mm, and when the length of the fiber is 1 mm or less, it constitutes an inorganic foamed molded article. It has the disadvantage that the bonding strength is not so large because the length of the fiber is connected between the particles are small, and should be uniformly dispersed with the fiber and the slurry-type ceramic in the mixing step, the fibers are entangled with each other when 50 mm or more Rather, it is preferable to use fibers having a length in the above range because there is a high possibility of inhibiting the physical properties of the inorganic foamed product. In addition, as the fiber concentration increases, tensile strength (including bending strength) is generally increased, which can greatly compensate for the disadvantages of the inorganic foam molded product which is vulnerable to impact or tensile strength, but with respect to the total inorganic content of the inorganic foam molded product. When it is more than 6.5% by weight, it can be used in the range of 1 to 6.5% by weight because it can be a factor of cost increase and economic competitiveness, and the fiber does not give the binding force between the particles and the particles that make up the shape, but only tensile strength or bending strength. Care should be taken because addition may result in worsening of the compressive strength, as this may contribute to the improvement.

In order to impart the functionality for improving the water resistance, the additive for increasing the water resistance and strength reinforcement may include a water dispersible polymer resin or a fine powder polymer resin, in the final heating step of the present invention to a temperature of 100 ℃ or less When heating, a water dispersible polymer resin is preferable. When heating and drying at a temperature of 100 ° C. or higher, fine powdered polymer resin is preferable. However, it is preferable to use a water dispersible polymer resin because it requires energy due to temperature rise. Do.

In the case of a water-dispersible polymer resin, there is no big limitation except that the polymer resin is uniformly dispersed in water, and the fluororesin; Polyvinyl alcohols; Polyvinyl pyrrolidones; Polyacrylic acid, styrene-acrylic acid copolymer, styrene-methacrylic acid copolymer, styrene-methacrylic acid-acrylic acid ester copolymer, styrene-a-methyl styrene-acrylic acid copolymer or styrene styrene acrylic resins such as -a-methylstyrene-acrylic acid-acrylic acid ester copolymer; Acrylic resins such as styrene-maleic acid copolymer, styrene-maleic anhydride copolymer, acrylic acid-acrylonitrile copolymer, vinyl acetate-acrylic acid ester copolymer or acrylic acid-acrylic acid ester copolymer; Vinyl naphthalene-acrylic acid copolymer, vinyl naphthalene-maleic acid copolymer and vinyl acetate-ethylene copolymer, vinyl acetate-vinyl acetate vinyl ethylene copolymer, vinyl acetate-maleic acid ester copolymer, vinyl acetate-crotonic acid copolymer, vinyl acetate-acrylic acid At least one polymer selected from vinyl acetate-based copolymers, such as copolymers, is included, and the amount of the water-dispersible polymer resin added is preferably 1.0 to 25 parts by weight based on the combined weight of magnesium oxide and its curing agent. More preferably, 2.5 to 25 parts by weight is advantageous, and most preferably, 5.0 to 15 parts by weight is advantageous. When added in an amount of 1.0 parts by weight or less, there is little role for seeding a sufficient polymer film between particles of the foamed molded product. It has the disadvantage that its water resistance is not large, and when it is added more than 25 parts by weight, the water resistance is quite high. It has the advantage of increasing, but it is advantageous to add the proper concentration proposed above because it has the disadvantage that it can be fatal to the human body by releasing a large amount of toxic gas by polymer decomposition in the event of fire.

As described above, in the case of the conventional method for manufacturing an inorganic insulating material, as a very high heat source and a large number of huge equipments are required, the global environment may be worsened due to global warming, and the company's competitiveness may be greatly reduced. In the case of lightweight foam cement (ALC, Autoclaved light concrets), as the inorganic molded article foamed by the foaming agent is deflected by the inorganic particles having a high specific gravity, the thermal insulation effect is not good. In the case of the lightweight foam cement, a large autoclave facility during the curing process And because the manufacturing process takes a long time, the risk of the company (Risk) had a big problem.

In the present application, a foaming agent dilution step of diluting a foaming agent which is a source of the foam to provide a large amount of microbubbles to the inorganic molded body; Bubble generation step for generating a large amount of fine bubbles of the diluted foam agent; Magnesium oxide slurry manufacturing step for providing the magnesium oxide powder which is the starting material of the non-combustible inorganic foamed molding to have fluidity under aqueous conditions; Dilution of the magnesium curing agent dissolving the curing agent of magnesium oxide in water; Mixing the bubble water made in the bubble generation step with the magnesium oxide slurry made in the manufacturing and supplying the magnesium oxide slurry and the diluting hardening agent made in the dilution and supplying step so that a large amount of fine bubbles are provided inside the inorganic molded body with a uniform distribution. step; A molding step for transferring the slurry in which the magnesium oxide, its hardener and the microbubbles are uniformly mixed into a mold in a shape of a predetermined shape; A large amount of microbubbles are included by a process including a final heating step for removing moisture contained in the molded body and a step of supplying a functional additive including an additive to impart functionality to the inorganic foamed product or to improve physical properties. It has the effect of providing a high-strength non-combustible room temperature inorganic foamed molded article that is hardened with a foamed magnesium cured body to impart functionality that can be used for thermal insulation, fireproofing, and soundproofing.

According to the technical idea of the present invention, almost no carbon dioxide is emitted during the manufacturing process, and a large amount of fine bubbles are present in the foamed molded article, and a semi-permanent non-flammable inorganic foamed molded article having excellent water resistance and durability can be obtained.

1 is a schematic manufacturing process diagram for producing an inorganic molded body using the bubble water containing fine bubbles in the magnesium oxide and its curing agent herein
Figure 2 is a photograph of a sample of thermal insulation product made in the production examples of the present application.

Hereinafter to describe the embodiments of the invention for implementing the technical idea of the present application, the following embodiments illustrate one application for the implementation of the technical idea of the present application, and should not be construed as limited thereto. It should be understood that the scope of protection of the present application should be equivalently interpreted as meanings and concepts consistent with the technical idea of the present invention, and that there may be various equivalents and modifications to replace them at the time of the present application. will be.

In addition, the embodiments described herein describe examples of the range that can achieve the object of the invention in a range that meets the desired level of results by the inventor through a number of trial and error, and beyond the upper and lower limits of the numerical value described In this case, the inventors should recognize that the figures are fixed values because they cannot achieve the desired purpose.

Example 1

After preparing three containers, one container was weighed with 100 g of magnesium oxide (MgO, hard) powder purchased from Samjeon Pure Chemical, and 100 ml of distilled water was supplied thereto, followed by the use of spatula. Slurry was prepared.

In another vessel, 60 g of magnesium chloride hexahydrate (MgCl ₂ · 6H ₂ O) was weighed, and 100 ml of water was supplied thereto, followed by dissolving to prepare a curing agent for magnesium oxide.

In the remaining container, a foaming agent (anionic surfactant) purchased from Korea Industrial Co., Ltd. was diluted and prepared with a 2% solution, and then foamed using a high-speed hand mixer to prepare a foamed water produced in microbubbles.

The prepared magnesium oxide slurry, the dissolved magnesium chloride solution and the foamed water were uniformly mixed and transferred to a 100 ml molded body to prepare two foamed molded articles containing water, and one was left at room temperature for 1 week, and the other was 100 The foamed inorganic molded product was prepared by drying in an oven at 3 ° C. for 3 hours.

Example 2

The same procedure as in Example 1 was carried out except that the blowing agent was diluted and prepared with a 2.5% solution.

Example 3

The same procedure as in Example 1 was carried out except that the foam was diluted with a 3.0% solution.

Example 4

After preparing three containers, one container was weighed with 100 g of magnesium oxide (MgO, hard) powder purchased from Samjeon Pure Chemical, and 100 ml of distilled water was supplied thereto, followed by the use of spatula. Slurry was prepared.

In another vessel, 40 g of magnesium sulfate heptahydrate (MgSO ₄ · 7H ₂ O) was weighed, and 100 ml of water was supplied thereto, followed by dissolving to prepare a curing agent for magnesium oxide.

In the remaining container, a foaming agent (anionic surfactant) purchased from Korea Industrial Co., Ltd. was diluted and prepared with a 2% solution, and then foamed using a high-speed hand mixer to prepare a foamed water produced in microbubbles.

The magnesium oxide slurry, the dissolved magnesium sulfate solution and the foamed water were uniformly mixed and transferred to a 100 ml molded body to prepare two foamed molded articles containing water, and then one was left at room temperature for one week, and the other was 100 The foamed inorganic molded product was prepared by drying in an oven at 3 ° C. for 3 hours.

Example 5

It was carried out in the same manner as in Example 4 except that the blowing agent was diluted and prepared with a 2.5% solution.

Example 6

The same procedure as in Example 4 was carried out except that the blowing agent was diluted and prepared in a 3.0% solution.

Example 7

After preparing three containers, one container was weighed with 100 g of magnesium oxide (MgO, hard) powder purchased from Samjeon Pure Chemical, and 100 ml of distilled water was supplied thereto, followed by the use of spatula. Slurry was prepared.

In another vessel, 20 g of monobasic ammonium phosphate monohydrate (NH ₄ H ₂ PO ₄ .1H ₂ O) was weighed, and 100 ml of water was supplied thereto, followed by dissolution, thereby preparing a curing agent for magnesium oxide.

In the remaining container, a foaming agent (anionic surfactant) purchased from Korea Industrial Co., Ltd. was diluted and prepared with a 2% solution, and then foamed using a high-speed hand mixer to prepare a foamed water produced in microbubbles.

The prepared magnesium oxide slurry, the dissolved magnesium chloride solution and the foamed water were uniformly mixed and transferred to a 100 ml molded body to prepare two foamed molded articles containing water, and one was left at room temperature for 1 week, and the other was 100 The foamed inorganic molded product was prepared by drying in an oven at 3 ° C. for 3 hours.

Example 8

The same procedure as in Example 7 was carried out except that the blowing agent was diluted and prepared with a 2.5% solution.

Example 9

The same procedure as in Example 7 was carried out except that the blowing agent was diluted and prepared in a 3.0% solution.

Example 10

The same procedure as in Example 3 was conducted except that 3.5 g of a fluorine-based water-repellent agent purchased from Nikka Korea Co., Ltd. was additionally supplied.

Example 11

Intex Korea was performed in the same manner as in Example 3 except that 5 g of the natural fiber (average 15 mm) was further added.

Comparative Examples 1-11

Magnesium chloride, magnesium sulfate, or monoammonium phosphate was not added, which is a curing agent for magnesium oxide, and was performed in the same manner as in Examples 1 to 11, and the results of Comparative Examples 1 to 11 and Examples 1 to 11 were shown in Table 1 below. Indicated.

Specific gravity of the analysis items of the foamed molded article provided in this Example and Comparative Example was carried out by KS L 3114, compressive strength was carried out by KS F 2405, tensile strength was carried out by KS F 2423, water resistance part of the prepared foamed molded article After extraction and sampling in water at room temperature, the plate was placed on the surface of the water so that the inorganic body was immersed in water, and the initial time of dissolving the magnesium oxide particles constituting the inorganic body by water was the water resistance time. The maximum duration of the experiment was 120 days.

division Drying method Analysis item importance
(g / cm3) Compressive strength
(kgf / cm2) The tensile strength
(kgf / cm2) Water resistance
(Work) Example 1 Room temperature drying 0.84 55.6 6.98 85 100 ℃ 0.81 55.9 6.76 93 Example 2 Room temperature drying 0.61 49.6 4.86 45 100 ℃ 0.60 49.0 4.88 48 Example 3 Room temperature drying 0.35 40.7 3.55 36 100 ℃ 0.33 41.2 3.58 39 Example 4 Room temperature drying 0.80 52.6 6.52 76 100 ℃ 0.81 52.0 6.55 72 Example 5 Room temperature drying 0.56 47.7 4.62 40 100 ℃ 0.56 47.1 4.58 43 Example 6 Room temperature drying 0.30 39.8 3.06 43 100 ℃ 0.32 38.8 3.13 31 Example 7 Room temperature drying 0.74 50.7 5.96 64 100 ℃ 0.74 50.3 5.94 68 Example 8 Room temperature drying 0.55 44.4 4.21 39 100 ℃ 0.54 43.9 4.18 42 Example 9 Room temperature drying 0.30 38.2 2.98 40 100 ℃ 0.30 38.0 3.04 36 Example 10 Room temperature drying 0.31 42.2 3.50 120 days or more 100 ℃ 0.32 42.0 3.52 120 days or more Example 11 Room temperature drying 0.30 41.6 8.86 41 100 ℃ 0.32 41.8 9.04 46 Comparative Examples 1-11 Room temperature drying Not measured Not measured Not measured Not measured 100 ℃ Not measured Not measured Not measured Not measured

As can be seen from the results of Table 1, in Comparative Examples 1 to 11, when the magnesium oxide, magnesium sulfate, monobasic ammonium phosphate hardener such as magnesium chloride was not added to the magnesium oxide, the drying method was dried at room temperature to 100 ° C. It was confirmed that the durability of the molded article was not expressed at all regardless of the temperature, and for this reason, it was impossible to test the properties of the inorganic molded article, whereas in Examples 1 to 11, when the magnesium oxide powder and its respective curing agents were included, As the bubbles are formed / provided, it was confirmed that a non-flammable inorganic foamed molded product having strength as well as water resistance was produced.

In Examples 1 to 11 of Table 1, the higher the content of the foaming agent, the lower the specific gravity, the compressive strength, and the tensile strength. This is because the fine bubbles generated in the bubble generation step between the particles and the particles forming the inorganic molded body. It can be expected that the bonding force is lowered due to the filling of the voids. This is because the fine air layer having excellent insulation effect and sound insulation effect can be freely controlled inside the inorganic form, and thus the preparation of the inorganic molded body suitable for the use of the insulation effect and the sound insulation effect can be expected. It was considered possible.

In addition, to improve the tensile strength (including bending strength) to improve the problems inherent in the inorganic molded body inherent properties of the tensile strength and water resistance, when the fiber (Fiber) is added, and the fluorine-based water-repellent agent is added to improve the water resistance tensile It was confirmed that the strength and water resistance were very improved.

In particular, in the drying process of the embodiment of the present invention, regardless of the temperature during the process of manufacturing the inorganic foamed molded article for thermal insulation and soundproofing, it can be produced in various ways to meet the use of high-strength non-combustible foamed molded article, Inorganic moldings for sound insulation can block or minimize the generation of CO ₂ during the manufacturing process, which can greatly contribute to preventing global warming and maximize energy savings, resulting in excellent price competitiveness and insulation and sound insulation materials in various industrial fields. The invention is expected to be widely used in.

1 shows a manufacturing process chart of one embodiment that can be applied to obtain an inorganic foam molded article excellent in durability and water resistance in the present application, room temperature inorganic foam using magnesium oxide and its curing agent to impart the functionality of the inorganic foam molded article The schematic manufacturing process for obtaining the molded article is already described in detail in the description 'Measures to solve the problem' and 'details for carrying out the invention' is an opinion that no separate explanation is required, Figure 2 is an embodiment of the present application As a photographic figure immersed in water to confirm the specific gravity and water resistance of the insulation molded product made while performing, the photographic figure of Figure 2a is a state floating on the water surface of the inorganic molded article obtained from the production example of the present application is lower than the water having a specific gravity of 1 Is a photograph taken a picture, Figure 2b is a photograph obtained from a manufacturing example of the present application Is a state into a molded article in a beaker to keep a floating state on the surface of the water during the water resistance test period of 120 days, while maintaining a high bonding strength without being combined cells are disrupted, and up a state in which the picture Fig.

Therefore, by using the magnesium oxide and its curing agent provided from the technical idea of the present application to form a structure in which multiple layers overlap in the foam (Foam) state containing the foam or the structure built into the steel panel for insulation or sound insulation, It can be provided as an inorganic foam molded article that can be used for a firewall, etc., and solves the problem of poor water resistance, which is a disadvantage of the inorganic molded article which was partially provided in the past, and does not require expensive utility equipment for manufacturing. It is an excellent invention that can overcome many problems of the prior art by a simple process that does not require high energy during the manufacturing process.

Therefore, as a sandwich panel provided by applying the technical idea of the present application, a magnesium oxide powder as a starting material of the non-combustible inorganic foamed molded product is obtained to obtain a slurry of magnesium oxide in order to provide fluidity under aqueous conditions, and magnesium chloride, magnesium sulfate, first Magnesium oxide curing agent selected from ammonium phosphate is diluted to 10 to 125 parts by weight based on 100 parts by weight of water to obtain a slurry of the curing agent, and dilutes the foaming agent which is the source of bubbles to provide a large amount of microbubbles to the inorganic molded body. And a foam having a certain shape by mixing the number of bubbles made through the process of generating bubbles by using a bubble forming means to form a large amount of fine bubbles with diluted foaming agent and the magnesium oxide slurry and the curing agent slurry. ) To remove the moisture contained in the molded body It includes a technical idea that can be applied to the sandwich panel of the configuration that the steel panel is wrapped around both sides of the inorganic foamed molded article after the drying step.

 No special sign or explanation is required.

Claims (12)

In the manufacturing method of the inorganic foam molded article which can be used for insulation, sound insulation, fire retardant, etc. in a foam state containing fine bubbles using magnesium oxide and its curing agent,
A bubble generating step of diluting a bubble agent which is a source of bubbles to provide a large amount of fine bubbles to the inorganic molded body, and using bubble forming means to form a large amount of fine bubbles with the diluted bubble agent;
Slurrying magnesium oxide for imparting fluidity to the magnesium oxide powder, which is a starting material of the non-combustible inorganic foamed compact, in an aqueous condition;
Dilution of the magnesium curing agent dissolving the curing agent of magnesium oxide in water;
A mixing step of mixing the bubble water and the magnesium oxide slurry prepared in the bubble generating step with a diluted curing agent;
A molding step of placing a slurry in which a magnesium oxide, its curing agent, and microbubbles are uniformly mixed into a mold to obtain a uniform shape;
Drying step for removing the water contained in the molded body;
Method for producing an inorganic foam molded article comprising a. The method of claim 1,
Method of producing an inorganic foamed molded article characterized in that the additive is added to the inorganic foamed molded article in the mixing step to improve the physical properties or to improve the physical properties. The method of claim 1,
The foaming agent used in the bubble generation step is amino acid, alkyl sulfonate, alkylbenzene and alkylamino acid salt, alkyl ether carbonate salt, acylated peptide salt, sulfated oil salt, alkyl sulfate salt, alkyl ether sulfate salt, alkylaryl The surfactant selected from ether sulfate, alkylamide sulfate, alkyl phosphate, alkyl ether phosphate and alkylaryl ether phosphate is used by adding 0.1 to 5.0 parts by weight based on 100 parts by weight of water. Method of producing an inorganic foamed molded article. The method of claim 1,
The bubble forming means used in the bubble generation step is equipped with a rotary blade from the same axis of the motor, a mixer (Mixer), a resolver (Dissolver), a Homer mixer (Homo mixer) which is stirred by a rotation speed of 500 ~ 12,000 rpm Method for producing an inorganic foamed molded article characterized in that the bubble is generated by using a foamer equipped with a compressed air of the stirrer or a compressor (compressor) and a nozzle equipped with. The method of claim 1,
The slurrying step is to supply a magnesium oxide having a particle size of 0.1 ㎛ ~ 0.25 mm based on 100 parts by weight of 25 parts by weight to 500 parts by weight of water and then uniformly mixed to obtain a slurry of magnesium oxide Method for producing an inorganic foam molded article. The method of claim 1,
In the dilution step of the magnesium curing agent, a curing agent selected from magnesium chloride, magnesium sulfate, and ammonium monophosphate may be used, and the inorganic foamed molded article may be diluted to 10 to 125 parts by weight based on 100 parts by weight of water. Manufacturing method. The method of claim 1,
In the drying step, a heating means selected from a near infrared heating method, an infrared heating method, a room temperature drying method, a microwave heating method, a hot air heating method using an oven, a hot plate direct heating method is used. Method for producing a foamed molded article. delete 3. The method of claim 2,
Seedling fiber, bast fiber, salt vein fiber, cellulose fiber of fruit fiber, protein fiber of stripe or filament form, mineral fiber, metal fiber, glass fiber, rock to improve the tensile strength as an additive to the inorganic foamed product The fiber selected from the fiber, the slag fiber, and the inorganic fiber of carbon fiber has a thickness in the range of 3 to 50 μm, and the length of the fiber is in the range of 1 to 50 mm, in the range of 1.5 to 6.5% by weight based on the combined weight of magnesium oxide and its curing agent. Method for producing an inorganic foam molded article characterized in that it is used in addition. delete The method according to claim 6,
When ammonium monophosphate is used as the hardener, sugar, boric acid, borax, citric acid, sodium citrate, sodium gluconate, tartaric acid (Tartaric acid) The method of producing an inorganic foamed molded article characterized in that the retardant is selected from 1.0 to 7.5 parts by weight based on 100 parts by weight of the first ammonium phosphate. In the sandwich panel provided with a built-in inorganic foam molded article that can be used for the heat insulating material, sound insulation material or fire protection material,
As a starting material of the non-combustible inorganic foamed molded product, a slurry of magnesium oxide was obtained to give magnesium oxide powder fluidity under aqueous conditions,
Magnesium oxide curing agent selected from magnesium chloride, magnesium sulfate and ammonium monophosphate is diluted to 10 to 125 parts by weight based on 100 parts by weight of water to obtain a slurry of curing agent.
The number of bubbles produced through the process of generating bubbles by using a bubble forming means to dilute the foaming agent as a source of the foam to provide a large amount of micro-bubbles to the inorganic molded body and to form a large amount of micro-bubbles with the diluted foaming agent; The steel panel is wrapped on both sides of the inorganic foamed molded article which has been dried to remove the moisture contained in the molded body by molding the magnesium oxide slurry and the hardener slurry mixed into a mold having a predetermined shape. Sandwich panel, characterized in that provided.

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