KR20150005003A - Sound absorbing and adiabatic material having lightweight fireproof using expandable graphite and manufacturing method of the same - Google Patents

Abstract

The present invention relates to a lightweight soundproof heat insulating material and a manufacturing method thereof. The heat insulating material includes: one or more materials selected from polyvinyl alcohol, polyethylene glycol, and methyl cellulose; heat-treated expanded graphite; and water-swellable clay. The water-swellable clay is made of a layered clay including water molecules between layers. The heat-treated expanded graphite is 10 to 100 parts by weight per 100 parts by weight of the water-swellable clay. The materials selected from the polyvinyl alcohol, polyethylene glycol, and methyl cellulose contain 30 to 200 parts by weight per 100 parts by weight of the total content of the water-swellable clay and the heat-treated expanded graphite and has the shape of a panel having the thickness of 5-50 mm. The present invention uses the expanded graphite and swelling clay to be lightweight and has excellent sound absorption, thermal insulation, fire resistance, and flame retardancy. The present invention can be manufactured without a firing process to enable simple manufacturing processes while lowering the production costs.

Description

TECHNICAL FIELD The present invention relates to a lightweight fire-extinguishing insulation material using expanded graphite and a manufacturing method thereof.

More particularly, the present invention relates to a lightweight fireproof and soundproof insulating material and a method of manufacturing the same. More particularly, the present invention relates to a lightweight fireproof and sound insulating material and a method of manufacturing the same. To a lightweight fireproof and soundproof insulating material which is simple in process and low in production cost, and a method for manufacturing the same.

Demand for soundproofing materials and insulation materials is rapidly increasing in order to improve the residential environment.

The styrofoam used for the construction insulation material or the soundproofing material is light and has excellent heat insulation and soundproofing effect. However, since it is weak in durability and is well ignited and burned, toxic gas is generated when a fire occurs, Use is limited.

In addition, glass fiber, which is widely used for building insulation materials and sound insulating materials, is safe from the risk of fire and the like. However, when exposed to the air, there is a possibility that dust on the bedding is harmful to human body due to abrasion of glass fiber, There is a fear that harmful dust may be generated during the construction process and the health of workers may be adversely affected during the construction process.

In addition, although the wood using the paper wood has an advantage of being environmentally friendly, it is vulnerable to fire, and as a result, it has poor performance as a sound absorbing material or a heat insulating material.

In addition, although there is a metal material such as aluminum (Al), since such a metal material is expensive, there is a waste of cost and resources.

In addition, although the cement concrete material is sometimes applied as a sound absorbing material, the sound absorbing material of the cement concrete material has a large specific gravity, so that the product is heavy, the workability is poor, and the sound absorption performance is not sufficient.

In order to solve the problems of the conventional sound absorbing material or the heat insulating material, development of a new material is required.

A problem to be solved by the present invention is to provide a process for producing a graphite which is lightweight because of the use of expanded graphite and swelling clay, has excellent sound absorption performance, heat insulation, fire resistance and flame retardancy and can be manufactured without being subjected to a firing process, And a method of manufacturing the same.

The present invention relates to a heat-treated expanded graphite sheet comprising at least one material selected from polyvinyl alcohol, polyethylene glycol and methylcellulose, heat-treated expanded graphite and swellable clay, wherein the swellable clay is composed of a layered clay containing water molecules between the layers, Wherein the expanded graphite is contained in an amount of 10 to 100 parts by weight with respect to 100 parts by weight of the swellable clay, and at least one material selected from the group consisting of polyvinyl alcohol, polyethylene glycol and methyl cellulose has a total content of the expandable graphite And 30 to 200 parts by weight based on 100 parts by weight of the composition, and has a thickness of 5 to 50 mm.

The lightweight fireproof and soundproof thermal insulating material may further comprise 10 to 200 parts by weight of at least one material selected from the group consisting of a glass component of silica glass and a silica glass in which the alkali metal component has been removed with respect to 100 parts by weight of the total amount of the expanded graphite and the swellable clay have.

The swellable clay may be composed of a layered clay containing exchangeable cations together with water molecules between the layers.

Also, the swellable clay may be composed of a layered clay in which water molecules in the interstices are partially exchanged with organic substances to form a clay-organic complex.

Wherein the swellable clay is comprised of at least one layered clay selected from bentonite, vermiculite, montmorillonite, clorite, sepiolite, ataplite, saponite, hectorite, bicellite, halloysite, .

The present invention also relates to a method for producing a soundproof thermal insulation composition, which comprises heat treating and expanding expanded graphite and at least one material selected from polyvinyl alcohol, polyethylene glycol and methyl cellulose, Molding the composition for a sound-and-heat insulating material in the form of a panel having a thickness of 5 to 50 mm, and drying the molded product, wherein the swellable clay is composed of a layered clay containing water molecules between the layers Wherein the heat-treated expanded graphite is mixed in an amount of 10 to 100 parts by weight with respect to 100 parts by weight of the swellable clay, and at least one material selected from the group consisting of polyvinyl alcohol, polyethylene glycol and methyl cellulose is mixed with the swollen clay and the heat- And 30 to 200 parts by weight per 100 parts by weight of the total weight of the composition. It provides a process for the production of sound-absorbing insulation.

10 to 200 parts by weight of at least one material selected from the group consisting of water glass and silica sol in which the alkali metal component has been removed is added to 100 parts by weight of the total amount of the heat-treated expanded graphite and the swellable clay in the step of forming the composition for sound- Can be mixed.

Further, in the step of forming the composition for a sound-absorbing and thermal insulating material, 10 to 100 parts by weight of at least one material selected from water and ethanol may be further mixed with 100 parts by weight of the total amount of the heat-treated expanded graphite and the swellable clay.

The swellable clay may be composed of a layered clay containing exchangeable cations together with water molecules between the layers.

Also, the swellable clay may be composed of a layered clay in which water molecules in the interstices are partially exchanged with organic substances to form a clay-organic complex.

The swelling clay may be at least one layered clay selected from among bentonite, vermiculite, montmorillonite, chlorite, sepiolite, ataplite, saponite, hectorite, ≪ / RTI >

According to the lightweight fire-and-heat insulating material of the present invention, since it is made of expanded graphite and swellable clay, it is lightweight, has excellent sound absorption performance, fire resistance and flame retardancy, and can be manufactured without being subjected to a firing process, thereby simplifying the process and lowering the production cost.

The lightweight fireproof sound insulating material produced by the present invention exhibits excellent soundproofing and heat insulating properties and is incombustible unlike the conventional heat insulating material, so that toxic gas is not generated in the case of fire.

In addition, the lightweight fire-and-noise insulating material produced by the present invention is flame-retardant, which is not flammable, and is made of an inorganic raw material harmless to the human body.

Figs. 1A to 1C are scanning electron microscope (SEM) photographs showing the state before the heat treatment of the expanded graphite used in Example 1. Fig.
2A to 2C are scanning electron microscope (SEM) photographs showing a state after heat treatment of the expanded graphite used in Example 1. Fig.
FIG. 3 is a graph showing the results of analyzing the expanded graphite used in Example 1 after heat treatment. FIG.
Figs. 4A to 4E are views showing a lightweight fire-and-noise insulating material produced according to Example 1. Fig.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, it should be understood that the following embodiments are provided so that those skilled in the art will be able to fully understand the present invention, and that various modifications may be made without departing from the scope of the present invention. It is not.

Conventional sound absorbing materials or heat insulating materials have at least one defect such as heavy, vulnerable to fire, poor in performance, harmful to human body, poor in workability, etc., and the present invention is applicable to lightweight fire- Provide insulation.

It is necessary to use a lightweight material to reduce the weight of the sound insulation. In order to meet these demands, expanded graphite and swellable clay are used as main raw materials, and these main ingredients contribute to the weight reduction of the entire sound absorbing insulation.

The lightweight fireproof sound insulating material according to a preferred embodiment of the present invention comprises at least one material selected from polyvinyl alcohol, polyethylene glycol and methyl cellulose, heat-treated expanded graphite and swellable clay, wherein the swellable clay has water molecules Wherein the heat-treated expanded graphite is contained in an amount of 10 to 100 parts by weight based on 100 parts by weight of the swellable clay, and at least one material selected from the group consisting of polyvinyl alcohol, polyethylene glycol and methyl cellulose is contained in the swellable clay And 30 to 200 parts by weight with respect to 100 parts by weight of the total amount of the heat-treated expanded graphite, and is in the form of a panel having a thickness of 5 to 50 mm.

Due to the layered nature of graphite, it is possible to insert atoms or small molecules between layers. When chemicals such as sulfur compounds and nitrogen compounds are intercalated in the interlayer and then heat is applied, the graphite is expanded to several tens to hundreds of times. Such graphite is called expanding graphite in particular.

As for the general manufacturing method of expanded graphite, graphite is mined from natural minerals, followed by pulverization and water treatment to produce graphite. The graphite is washed with strong acid, sintered at high temperature and alkali, The graphite having a purity of 99.5% is formed through intercalation of chemicals between the layers of graphite, followed by neutralization, followed by washing and drying to produce expanded graphite.

In the expanded graphite produced in this manner, expansion occurs as gas is generated in the chemical contained in the interlayer by heat. The expansion starting temperature of the expanded graphite is determined according to the chemical used.

Expansive graphite is a flame retardant that forms a solid phase layer, and the expanded carbon layer acts as an insulating layer and interferes with the movement of heat. Such expanded graphite can be applied as a non-halogen type low flammability environmentally friendly flame retardant. When the expanded graphite is expanded by heat treatment, there is a property that the heat insulating property is excellent in a direction perpendicular to the plane forming the layer.

Such expanded graphite has no toxicity, is light, contains no halogen component, is insoluble in water, and does not generate toxic gas.

On the other hand, the swellable clay provides plasticity to the substrate during the molding process and maintains sufficient molding strength. The addition of the swelling clay improves the plasticity and makes it possible to manufacture a sound-absorbing thermal insulating material that is light in weight.

Swellable clay is a layered clay having a fine particle shape (shape) in which clay platelets are retained by weak Van der Waals forces. Such a swellable clay generally can absorb moisture well and can provide a factor for shrinking and forming pores as the absorbed water evaporates.

These swellable clays that swell by absorbing water include not only layered clays in which water molecules are present between the layers but also water molecules in the interstices with exchangeable cations (generally alkaline ions Na ⁺ , Li ^+, etc.) Layered clay, and layered clay in which the water molecules in the interlayer are partially exchanged with organic matter to form a clay-organic composite.

The swelling clay in which water molecules are intermixed with exchangeable cations is basically arranged in a regular manner by coordinating water molecules with exchangeable cations and hydrogen bonding between water molecules and between bottom molecules. On the other hand, the amount of such interlayer water, that is, the number of water molecules, changes stepwise depending on the ambient humidity and the types of exchangeable cations that are intercalated between the layers, thereby changing the interlayer spacing. These swellable clays containing exchangeable cations undergo surface substitution reaction with colloidal particles having different inorganic cluster cations or cationic surface charges due to their inherent cation exchange properties, forming so-called pillared clays . Stable pores can be formed in such a crosslinked clay because inorganic oxides exist while interlayer-crosslinking.

 The swelling clay, which forms a clay-organic complex by partial exchange of water molecules in the interlayer, is formed by ion exchange reaction with exchangeable cations and organic cations present in the interlayer or by adsorption of polar organic molecules Organic matter is incorporated. For example, organic molecules such as neutral molecules such as ethylene glycol glycerol and alkylammonium may be incorporated.

These swelling clays may be selected from the group consisting of bentonite, vermiculite, montmorillonite, chlorite, sepiolite, attapulgite, saponite, hectorite, ), Beidellite, halloysite, sauconite, and nontronite. ≪ Desc / Clms Page number 7 >

Bentonite in the swelling clay is strong in the point of view and has high swelling property and cation exchange ability.

Among the swelling clays, montmorillonite exhibits specific swelling characteristics by hydration reaction of interlayer ions in an aqueous solution. Since montmorillonite has a high cation exchange capacity, lattice detachment due to swelling easily occurs in an aqueous solution. In the case of montmorillonite having a Na ⁺ or Li ⁺ exchangeable cation, the interlayer distance is measured to about 40 to 140 Å in water, which is a phenomenon in which the clay is swollen by adsorption of water between layers in water .

Among the swelling clays, the halloysite contains intercalated water molecules between the layers in a wet state, but does not contain exchangeable cations. The interlayer water of this halosite is easily dehydrated when dried, and the interlayer spacing is reduced from about 10 Å to about 7.4 Å to 7.5 Å.

Such swelling clay enables plasticity to be improved and lightweight to be realized, and also serves as a water-borne material (or waterproofing material) to prevent water from passing through a lightweight fire-and-heat insulating material.

In addition, the lightweight fireproof sound insulating material according to a preferred embodiment of the present invention includes at least one material selected from polyvinyl alcohol, polyethylene glycol, and methyl cellulose. Polyvinyl alcohol, polyethylene glycol, and methylcellulose serves as an adhesive for imparting an adhesive force between the expanded graphite and the swellable clay particles and maintaining the strength of the sound-absorbing thermal insulator at the time of molding, thereby improving the workability of the sound- It is also possible to increase the elasticity. It is preferable that at least one material selected from the group consisting of polyvinyl alcohol, polyethylene glycol and methyl cellulose is contained in an amount of 30 to 200 parts by weight based on 100 parts by weight of the total amount of the swollen clay and the heat-treated expanded graphite.

In addition, the lightweight fireproof sound insulating material according to the preferred embodiment of the present invention may further include at least one material selected from the group consisting of glass components of silica glass and alkali silica-free water glass such as Na in order to improve flame retardancy. For example, SiO ₂ and Na ₂ CO ₃ are mixed and melted and quenched to obtain water glass, which is then adsorbed on the resin to form an alkali metal component (for example, Na ). ≪ / RTI > The silica sol is a colloid in which fine particles of silicic acid (SiO ₂ .nH ₂ O) are dispersed in a dispersion medium such as water. When the silica sol is subjected to a drying process, it becomes silica through the silica gel. The inclusion of at least one material selected from the glass component of silica glass and the glass component from which the alkali metal component has been removed will compensate for the insufficient flame retardancy of the expanded graphite so that the flame retardancy can be improved and the oxidation of the expanded graphite can be prevented, . It is preferable that at least one material selected from the glass component and silica of the water glass from which the alkali metal component has been removed contains 10 to 200 parts by weight based on 100 parts by weight of the total amount of the heat-treated expanded graphite and the swellable clay.

Hereinafter, a method of manufacturing a lightweight fire-and-noise insulating material according to a preferred embodiment of the present invention will be described in detail.

Expansion graphite is charged into a furnace such as an electric furnace and a heat treatment process is performed. The expanded graphite preferably has an expansion starting temperature of about 500 to 900 DEG C for about 10 seconds to about 12 hours at a relatively low temperature, depending on the chemicals (e.g., sulfur compound, nitrogen compound) . It is desirable to keep the pressure inside the furnace constant during the heat treatment.

The heat treatment is preferably performed at a temperature in the range of 500 to 900 占 폚. If the heat treatment temperature is less than 500 ° C, the expanded graphite may be incompletely heat-treated and the characteristics of the sound insulating material may not be good. If the heat treatment temperature is higher than 900 ° C, energy consumption may be large and it may be uneconomical.

It is preferable to raise the temperature to the heat treatment temperature at a rate of 1 to 50 ° C / min. If the rate of temperature rise is too slow, it takes a long time to decrease the productivity. If the rate of temperature rise is too high, It is preferable to raise the temperature at the temperature raising rate in the above range.

The heat treatment is preferably performed at a heat treatment temperature for 10 seconds to 12 hours. If the heat treatment time is too long, it is not economical because the energy consumption is high. Further, it is difficult to expect further heat treatment effect. If the heat treatment time is short, sufficient expansion of the expanded graphite may not occur due to incomplete heat treatment.

The heat treatment is preferably performed in an oxidizing atmosphere (for example, air or oxygen (O ₂ ) atmosphere).

After the heat treatment process is performed, the furnace temperature is lowered to unload the heat-treated expanded graphite. The furnace cooling may be effected by shutting down the furnace power source to cool it in a natural state, or optionally by setting a temperature decreasing rate (for example, 10 DEG C / min). It is preferable to keep the pressure inside the furnace constant even while the furnace temperature is lowered.

As a starting material, at least one material selected from polyvinyl alcohol, polyethylene glycol and methyl cellulose, heat-treated expanded graphite and swellable clay are mixed to form a composition for a sound-absorbing thermal insulator. The heat-treated expanded graphite is preferably mixed in an amount of 10 to 100 parts by weight with respect to 100 parts by weight of the swellable clay. Preferably, at least one material selected from the group consisting of polyvinyl alcohol, polyethylene glycol and methyl cellulose is mixed in an amount of 30 to 200 parts by weight based on 100 parts by weight of the total amount of the heat-treated expanded graphite and the swellable clay.

10 to 100 parts by weight of at least one material selected from water and ethanol may be further mixed with 100 parts by weight of the total amount of the heat-treated expanded graphite and the swellable clay when the starting material is mixed to form the composition for a sound- have.

When the starting material is mixed to form a composition for a sound-absorbing thermal insulator, at least one material selected from the group consisting of water glass and silica sol in which the alkali metal component is removed with respect to 100 parts by weight of the total amount of the expanded graphite and the swellable clay 10 to 200 parts by weight may be further mixed. The addition of at least one material selected from the group consisting of water glass and silica sol from which the alkali metal component is removed complements the deficient flame retardancy of the expanded graphite, so that the flame retardancy can be improved and the oxidation and expansion of the expanded graphite can be prevented, It is effective. For example, SiO ₂ and Na ₂ CO ₃ are mixed and melted and quenched to obtain water glass, which is then adsorbed on the resin to form an alkali metal component (for example, Na ). ≪ / RTI > The silica sol is a colloid in which fine particles of silicic acid (SiO ₂ .nH ₂ O) are dispersed in a dispersion medium such as water.

The composition for a sound-absorbing and thermal insulating material is molded to form a sound-absorbing and thermal insulating material molding. Polyvinyl alcohol, polyethylene glycol, and methylcellulose, a composition for a sound-and-heat insulating material including expanded graphite and swellable clay is injected into a mold and molded into a desired shape. The molded body is preferably in the form of a panel and has a thickness of 5 to 50 mm. The shaping can be done in a variety of ways. For example, the molded body may be formed in a flat panel type, and the molding may be performed by uniaxial pressing or biaxial pressing at a predetermined pressure (for example, 1 to 10 tons) or by using an extruder.

The molded product is dried. The drying may be performed at a temperature below the boiling point of the water, for example, at a temperature of about 40 to 100 DEG C. If the drying temperature is lower than 40 DEG C, sufficient drying may not be performed. If the temperature exceeds 100 DEG C, And this can be connected to the increase in the manufacturing cost of the lightweight fireproof sound insulating material. The silica sol is converted into silica gel by the drying process and then becomes silica. In addition, the drying step removes the water component from the waterglass from which the alkali metal component has been removed, leaving a glass component.

The lightweight fireproof sound insulating material produced by the present invention can be applied to various fields as a sound absorbing material or a heat insulating material with a sound absorption rate of 0.5 or more based on a NRC (noise reduction coefficient), and it can be applied to a conventional sound absorbing insulation material, Unlike the sound-absorbing insulation of the present invention, the convenience during the construction process is greatly improved.

In addition, since the lightweight fireproof and soundproof thermal insulation material of the present invention is much lighter than the conventional sound insulation thermal insulation material, the load of various structures can be reduced when the lightweight fireproof and soundproof insulation material of the present invention is applied.

In addition, the lightweight fireproof and soundproof thermal insulation material of the present invention has remarkably improved flame retardancy, and is superior in fire stability to a fireproof insulation material such as a styrofoam, a wood material and the like.

Hereinafter, embodiments according to the present invention will be specifically shown, and the present invention is not limited to the following embodiments.

≪ Example 1 >

Expansion graphite was charged into an electric furnace and a heat treatment process was performed. The heat treatment was carried out at a temperature of 600 ° C for 1 hour. The heat treatment temperature was raised at a heating rate of 5 ° C / min. The heat treatment was performed in an air atmosphere. After the heat treatment process, the furnace temperature was naturally cooled.

Polyvinyl alcohol, heat-treated expanded graphite and bentonite, which is a swelling clay, were mixed as a starting material to form a composition for a sound-insulating material. The bentonite and the heat-treated expanded graphite were mixed in a weight ratio of 9: 1, and the polyvinyl alcohol was mixed in an amount of 30 to 143 parts by weight based on 100 parts by weight of the total amount of the bentonite and the heat-treated expanded graphite.

The composition for a sound-absorbing and thermal insulating material was molded to form a sound-absorbing and heat insulating material molding. Polyvinyl alcohol, heat-treated expanded graphite and bentonite were injected into a mold and uniaxially pressed at a pressure of about 3 tons. The molded body was formed to have thicknesses of 4 mm, 10 mm and 15 mm, respectively.

The molded product was dried to form a lightweight fire-and-heat insulating material. The drying was carried out at a temperature of about 70 DEG C for 24 hours.

FIGS. 1A to 1C are scanning electron microscope (SEM) photographs showing the state before the heat treatment of the expanded graphite used in Example 1, and FIGS. 2A to 2C are graphs showing the results of the heat treatment of the expanded graphite used in Example 1 FIG. 3 is a view showing the result of analyzing the composition of the expanded graphite used in Example 1 after heat treatment. FIG. 3 is a scanning electron microscope (SEM)

Referring to FIGS. 1A to 3, expanded graphite is expanded after heat treatment, and it can be seen that carbon (C) is a main component and contains oxygen (O), sulfur (S) and iron (Fe) . It is judged that the sulfur compound (for example, sulfuric acid) is intercalated between the layers of the expanded graphite due to the inclusion of the sulfur (S) component.

Figs. 4A to 4E are views showing a lightweight fire-and-noise insulating material produced according to Example 1. Fig. Fig. 4A shows the case where 143 parts by weight of polyvinyl alcohol is mixed with 100 parts by weight of the total amount of bentonite and heat-expanded expanded graphite, and the molded body is made to have a thickness of 15 mm. Fig. 4B is a graph showing the relationship between the total content of bentonite and heat- And 84 parts by weight of polyvinyl alcohol was mixed with 100 parts by weight of the expanded graphite. The molded body was made to have a thickness of 4 mm, and FIG. 4C shows the result of mixing 88 parts by weight of polyvinyl alcohol with 100 parts by weight of bentonite and heat- Fig. 4D shows the case where 54 parts by weight of polyvinyl alcohol is mixed with 100 parts by weight of the total content of the bentonite and the heat-treated expanded graphite, and the molded body is made to have a thickness of 10 mm. Fig. 4E is a graph obtained by mixing 71 parts by weight of polyvinyl alcohol with 100 parts by weight of the total content of bentonite and heat-treated expanded graphite The molded body is for a case of being manufactured to a thickness of 10 mm.

4A to 4E, cracks occurred when the thickness of the molded article was as thin as 4 mm, and partial cracking occurred when the molded article had a thickness of 10 mm or more.

≪ Example 2 >

Expansion graphite was charged into an electric furnace and a heat treatment process was performed. The heat treatment was carried out at a temperature of 600 ° C for 1 hour. The heat treatment temperature was raised at a heating rate of 5 ° C / min. The heat treatment was performed in an air atmosphere. After the heat treatment process, the furnace temperature was naturally cooled.

Polyvinyl alcohol, heat-treated expanded graphite and bentonite, which is a swelling clay, were mixed as a starting material to form a composition for a sound-insulating material. The bentonite and the heat-treated expanded graphite were mixed at a weight ratio of 8: 2 and 7: 3, respectively. The polyvinyl alcohol was mixed with 71 parts by weight with respect to 100 parts by weight of the total content of the bentonite and the heat-treated expanded graphite.

The composition for a sound-absorbing and thermal insulating material was molded to form a sound-absorbing and heat insulating material molding. Polyvinyl alcohol, heat-treated expanded graphite and bentonite were injected into a mold and uniaxially pressed at a pressure of about 3 tons. The formed body was formed to a thickness of 10 mm.

The molded product was dried to form a lightweight fire-and-heat insulating material. The drying was carried out at a temperature of about 70 DEG C for 24 hours.

The lightweight fire-and-waterproof insulation material produced according to Example 2 did not crack or crack.

≪ Example 3 >

Expansion graphite was charged into an electric furnace and a heat treatment process was performed. The heat treatment was carried out at a temperature of 600 ° C for 1 hour. The heat treatment temperature was raised at a heating rate of 5 ° C / min. The heat treatment was performed in an air atmosphere. After the heat treatment process, the furnace temperature was naturally cooled.

Polyvinyl alcohol, heat-treated expanded graphite, bentonite as a starting material, bentonite, and silica sol were mixed to form a composition for a sound-absorbing thermal insulator. The bentonite and the heat-treated expanded graphite were mixed in a weight ratio of 7: 3, and the polyvinyl alcohol was mixed with 71 parts by weight based on 100 parts by weight of the total amount of the bentonite and the heat-treated expanded graphite, 100 parts by weight of 100 parts by weight of the bentonite and the heat-treated expanded graphite were mixed.

The composition for a sound-absorbing and thermal insulating material was molded to form a sound-absorbing and heat insulating material molding. Polyvinyl alcohol, heat-treated expanded graphite, bentonite, and silica sol was injected into a mold and uniaxially pressed at a pressure of about 4.5 tons. The formed body was formed to a thickness of 10 mm.

The molded product was dried to form a lightweight fire-and-heat insulating material. The drying was carried out at a temperature of about 70 DEG C for 24 hours.

The lightweight fire-and-waterproof insulation material produced according to Example 3 did not crack or crack.

<Example 4>

Expansion graphite was charged into an electric furnace and a heat treatment process was performed. The heat treatment was carried out at a temperature of 600 ° C for 1 hour. The heat treatment temperature was raised at a heating rate of 5 ° C / min. The heat treatment was performed in an air atmosphere. After the heat treatment process, the furnace temperature was naturally cooled.

Polyvinyl alcohol, heat-expanded expanded graphite, bentonite as a starting material, bentonite and water were mixed to form a composition for a sound-insulating material. The bentonite and the heat-treated expanded graphite were mixed in a weight ratio of 5: 5. The polyvinyl alcohol was mixed with 38 parts by weight and 63 parts by weight with respect to 100 parts by weight of the total content of the bentonite and the heat-treated expanded graphite, The water was mixed in an amount of 75 parts by weight based on 100 parts by weight of the total content of the bentonite and the heat-treated expanded graphite.

The composition for a sound-absorbing and thermal insulating material was molded to form a sound-absorbing and heat insulating material molding. Polyvinyl alcohol, heat-treated expanded graphite, bentonite, and water was molded into a mold and uniaxially pressed at a pressure of about 5 tons. The formed body was formed to a thickness of 10 mm.

The molded product was dried to form a lightweight fire-and-heat insulating material. The drying was carried out at a temperature of about 70 DEG C for 24 hours.

The lightweight fire-and-waterproof insulation material prepared according to Example 4 had a shape in which small-sized particles were aggregated and clad-like and had excellent strength as compared with the lightweight fire-and-heat insulating material prepared according to Examples 1 to 3 .

&Lt; Example 5 >

Expansion graphite was charged into an electric furnace and a heat treatment process was performed. The heat treatment was carried out at a temperature of 600 ° C for 1 hour. The heat treatment temperature was raised at a heating rate of 5 ° C / min. The heat treatment was performed in an air atmosphere. After the heat treatment process, the furnace temperature was naturally cooled.

Polyvinyl alcohol, heat-treated expanded graphite, bentonite as a starting material, bentonite and ethanol were mixed to form a composition for a sound-absorbing thermal insulator. The bentonite and the heat-treated expanded graphite were mixed in a weight ratio of 5: 5. The polyvinyl alcohol was mixed with 38 parts by weight and 63 parts by weight with respect to 100 parts by weight of the total content of the bentonite and the heat-treated expanded graphite, The ethanol was mixed in an amount of 75 parts by weight based on 100 parts by weight of the total content of the bentonite and the heat-treated expanded graphite.

The composition for a sound-absorbing and thermal insulating material was molded to form a sound-absorbing and heat insulating material molding. Polyvinyl alcohol, heat-treated expanded graphite, bentonite and ethanol was injected into a mold and uniaxially pressed at a pressure of about 5 tons. The formed body was formed to a thickness of 10 mm.

The molded product was dried to form a lightweight fire-and-heat insulating material. The drying was carried out at a temperature of about 70 DEG C for 24 hours.

The composition for a sound-absorbing insulation material prepared according to Example 5 was excellent in moldability. However, the lightweight fire-and-noise insulating material prepared according to Example 5 had a lower strength than the lightweight fire-and-waterproofing insulation material prepared according to Example 4.

&Lt; Example 6 >

Expansion graphite was charged into an electric furnace and a heat treatment process was performed. The heat treatment was carried out at a temperature of 600 ° C for 1 hour. The heat treatment temperature was raised at a heating rate of 5 ° C / min. The heat treatment was performed in an air atmosphere. After the heat treatment process, the furnace temperature was naturally cooled.

Polyvinyl alcohol, heat-treated expanded graphite, bentonite as a starting material, bentonite, and silica sol were mixed to form a composition for a sound-absorbing thermal insulator. The bentonite and the heat-treated expanded graphite were mixed in a weight ratio of 5: 5, and the polyvinyl alcohol was mixed with 38 parts by weight of 100 parts by weight of the total amount of the bentonite and the heat-treated expanded graphite, 75 parts by weight were mixed with 100 parts by weight of the total content of bentonite and the heat-treated expanded graphite.

The composition for a sound-absorbing and thermal insulating material was molded to form a sound-absorbing and heat insulating material molding. Polyvinyl alcohol, heat-treated expanded graphite, bentonite, and silica sol was injected into a mold and uniaxially pressed at a pressure of about 5 tons. The formed body was formed to a thickness of 10 mm.

The molded product was dried to form a lightweight fire-and-heat insulating material. The drying was carried out at a temperature of about 70 DEG C for 24 hours.

The composition for a sound-absorbing insulation material prepared according to Example 6 was slightly lower in formability than the composition for a sound-absorbing insulation material prepared according to Example 5, and the lightweight fire-and-heat insulating material prepared according to Example 6 was produced according to Example 5 Which is higher than that of the lightweight fire - extinguishing insulation.

&Lt; Example 7 >

Expansion graphite was charged into an electric furnace and a heat treatment process was performed. The heat treatment was carried out at a temperature of 600 ° C for 1 hour. The heat treatment temperature was raised at a heating rate of 5 ° C / min. The heat treatment was performed in an air atmosphere. After the heat treatment process, the furnace temperature was naturally cooled.

Polyvinyl alcohol, heat-expanded expanded graphite, bentonite which is a swelling clay, water, ethanol and silica sol were mixed as a starting material to form a composition for a sound-insulating material. The bentonite and the heat-treated expanded graphite were mixed in a weight ratio of 5: 5, and the polyvinyl alcohol was mixed with 63 parts by weight of 100 parts by weight of the bentonite and the heat-treated expanded graphite, And 38 parts by weight based on 100 parts by weight of the total amount of the heat-treated expanded graphite. The ethanol was mixed with the bentonite in an amount of 50 parts by weight based on 100 parts by weight of the total amount of the heat-treated expanded graphite, 75 parts by weight were mixed with 100 parts by weight of the total content of bentonite and the heat-treated expanded graphite.

The composition for a sound-absorbing and thermal insulating material was molded to form a sound-absorbing and heat insulating material molding. Polyvinyl alcohol, heat-treated expanded graphite, bentonite, water, ethanol and silica sol were injected into a mold and uniaxially pressed at a pressure of about 5 tons. The formed body was formed to a thickness of 10 mm.

The molded product was dried to form a lightweight fire-and-heat insulating material. The drying was carried out at a temperature of about 70 DEG C for 24 hours.

The composition for a sound-absorbing insulation material prepared according to Example 7 was excellent in moldability, and the lightweight fire-resisting and sound-insulating material prepared according to Example 7 had a higher strength than the lightweight fire-and-heat insulating material prepared according to Example 5.

&Lt; Example 8 >

Expansion graphite was charged into an electric furnace and a heat treatment process was performed. The heat treatment was carried out at a temperature of 600 ° C for 1 hour. The heat treatment temperature was raised at a heating rate of 5 ° C / min. The heat treatment was performed in an air atmosphere. After the heat treatment process, the furnace temperature was naturally cooled.

Polyvinyl alcohol, heat-expanded expanded graphite, bentonite as a starting material, bentonite as a starting material, water and silica sol were mixed to form a composition for a sound-absorbing thermal insulator. The bentonite and the heat-treated expanded graphite were mixed in a weight ratio of 5: 5, and the polyvinyl alcohol was mixed with the bentonite in an amount of 50 parts by weight based on 100 parts by weight of the total amount of the heat-treated expanded graphite, And 30 parts by weight based on 100 parts by weight of the total amount of the heat-treated expanded graphite. The silica sol was mixed with the bentonite in an amount of 30 parts by weight based on 100 parts by weight of the heat-treated expanded graphite.

The composition for a sound-absorbing and thermal insulating material was molded to form a sound-absorbing and heat insulating material molding. Polyvinyl alcohol, heat-treated expanded graphite, bentonite, water and silica sol were injected into a mold and uniaxially pressed at a pressure of about 6 tons. The formed body was formed to a thickness of 10 mm.

The molded product was dried to form a lightweight fire-and-heat insulating material. The drying was carried out at a temperature of about 70 DEG C for 24 hours.

The composition for sound-absorbing insulation prepared according to Example 8 showed excellent moldability.

&Lt; Example 9 >

Expansion graphite was charged into an electric furnace and a heat treatment process was performed. The heat treatment was carried out at a temperature of 600 ° C for 1 hour. The heat treatment temperature was raised at a heating rate of 5 ° C / min. The heat treatment was performed in an air atmosphere. After the heat treatment process, the furnace temperature was naturally cooled.

Polyvinyl alcohol, heat-expanded expanded graphite, bentonite as a starting material, bentonite as a starting material, water and silica sol were mixed to form a composition for a sound-absorbing thermal insulator. The bentonite and the heat-treated expanded graphite were mixed in a weight ratio of 5: 5, and the polyvinyl alcohol was mixed with the bentonite in an amount of 50 parts by weight based on 100 parts by weight of the total amount of the heat-treated expanded graphite, And 10 parts by weight based on 100 parts by weight of the total amount of the heat-treated expanded graphite. The silica sol was mixed with the bentonite in an amount of 30 parts by weight based on 100 parts by weight of the total amount of the heat-treated expanded graphite.

The composition for a sound-absorbing and thermal insulating material was molded to form a sound-absorbing and heat insulating material molding. Polyvinyl alcohol, heat-treated expanded graphite, bentonite, water and silica sol were injected into a mold and uniaxially pressed at a pressure of about 6 tons. The formed body was formed to a thickness of 10 mm.

The molded product was dried to form a lightweight fire-and-heat insulating material. The drying was carried out at a temperature of about 70 DEG C for 24 hours.

The composition for sound-absorbing insulation prepared according to Example 9 showed excellent moldability.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, This is possible.

Claims (11)

At least one material selected from polyvinyl alcohol, polyethylene glycol and methyl cellulose, heat-treated expanded graphite and swellable clay,
The swellable clay is composed of a layered clay containing water molecules between the layers,
The heat-treated expanded graphite is contained in an amount of 10 to 100 parts by weight based on 100 parts by weight of the swellable clay,
Wherein at least one material selected from the group consisting of polyvinyl alcohol, polyethylene glycol and methyl cellulose is contained in an amount of 30 to 200 parts by weight based on 100 parts by weight of the total amount of the swollen clay and the heat-
Wherein the panel is in the form of a panel having a thickness of 5 to 50 mm.
The method according to claim 1, further comprising 10 to 200 parts by weight of at least one material selected from the group consisting of a glass component of water glass from which an alkali metal component has been removed and silica, relative to 100 parts by weight of the total amount of the expanded graphite and the swellable clay Features lightweight fireproof sound-absorbing insulation.
The lightweight fireproof sound insulating material according to claim 1, wherein the swellable clay is composed of a layered clay containing water molecules and exchangeable cations between the layers.
The lightweight fireproof sound insulating material according to claim 1, wherein the swelling clay is composed of a layered clay which forms a clay-organic composite by partially exchanging water molecules in the interstices with organic matter.
The method of claim 1, wherein the swellable clay is selected from the group consisting of bentonite, vermiculite, montmorillonite, chlorite, sepiolite, ataplite, saponite, hectorite, Wherein the layered clay is composed of at least one layered clay.
Expanding the expanded graphite by heat treatment;
Mixing at least one material selected from the group consisting of polyvinyl alcohol, polyethylene glycol and methyl cellulose, the heat-treated expanded graphite and the swellable clay to form a composition for a sound-absorbing thermal insulator;
Molding the composition for a sound-and-heat insulating material into a panel having a thickness of 5 to 50 mm; And
Drying the molded product,
The swellable clay is composed of a layered clay containing water molecules between the layers,
The heat-treated expanded graphite is mixed in an amount of 10 to 100 parts by weight with respect to 100 parts by weight of the swellable clay,
Wherein at least one material selected from the group consisting of polyvinyl alcohol, polyethylene glycol and methyl cellulose is mixed in an amount of 30 to 200 parts by weight per 100 parts by weight of the total amount of the heat-treated expanded graphite and the swellable clay. Gt;
7. The method according to claim 6, wherein in the step of forming the composition for a sound-
Wherein 10 to 200 parts by weight of at least one material selected from the group consisting of water glass and silica sol, from which alkali metal components have been removed, are further mixed with 100 parts by weight of the total amount of the heat-treated expanded graphite and the swellable clay. Gt;
7. The method according to claim 6, wherein in the step of forming the composition for a sound-
Wherein 10 to 100 parts by weight of at least one material selected from water and ethanol is further mixed with 100 parts by weight of the total amount of the heat-treated expanded graphite and the swellable clay.
7. The method of claim 6, wherein the swellable clay is composed of a layered clay containing water molecules and exchangeable cations between the layers.
The method of claim 6, wherein the swelling clay is composed of a layered clay in which water molecules in the interlayer are partially exchanged with organic matter to form a clay-organic composite.
7. The method of claim 6 wherein the swellable clay is selected from the group consisting of bentonite, vermiculite, montmorillonite, clorite, sepiolite, ataplite, saponite, hectorite, bicellite, Wherein the layered clay is composed of at least one layered clay.

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