KR101134664B1 - High performance heat insulator and method for manufacturing the same - Google Patents

Abstract

The present invention relates to a high-performance heat insulating material and a method for manufacturing the same, which is a heat-insulating compressed body that compresses a fibrous material in which any one of the metal oxide and inorganic powder entangled selected from the group consisting of titanium oxide, zirconium oxide and combinations thereof. And a high performance insulation comprising a silica cloth woven from silica fibers that wraps around the insulating compact.

The high-performance heat insulating material can be used even in a situation where a continuous heat is applied up to 1700 ℃, it has a heat insulating performance of about 3 to 4 times at a high temperature while being smaller in volume than a conventional heat insulating material, thereby reducing fuel costs, accordingly CO2 emissions can also be reduced.

Insulation, Titanium Oxide, Zirconium Oxide, Silica, Fumed Silica, TiO2, ZrO2, SiO2, Fibrous Materials, Glass Fiber, Silica Fiber, Silica Cloth, Dry

Description

HIGH PERFORMANCE HEAT INSULATOR AND METHOD FOR MANUFACTURING THE SAME

The present invention relates to a high performance insulating material and a method for manufacturing the same, and to a high performance insulating material and a method for manufacturing the same, which can be used in various fields such as space, aviation, and compact electric heating devices.

In recent years, the heat insulating material which press-molded inorganic fine particles, such as a silica or an alumina which is excellent in heat insulation, is used widely. However, the heat insulating material containing such inorganic fine particles is very weak in durability, and there is a problem that even a slight impact is destroyed when transporting or constructing. In addition, the heat insulator including the inorganic fine particles lacks cohesive force, so that the inorganic fine particles are deposited on the hands and clothes of the worker who handles them, thereby reducing workability.

In order to solve the above problems, in order to reinforce the durability of the heat insulating material or to prevent the adhesion of the inorganic fine particles, it is common to coat the whole heat insulating material with a cloth woven from a metal film, a plastic film, or glass fiber. However, when cutting or punching the heat insulating material for the coating, there is a problem that the heat insulating effect of the heat insulating material is reduced, or the use temperature is limited by the thermal durability of the coating material.

In addition, when using the said coating material, an organic binder or an inorganic binder may be used in order to improve the adhesiveness of a heat insulating material and a coating material. However, the organic binder is limited in the use temperature of the heat insulator, the inorganic binder is not limited in the use temperature of the heat insulator, the adhesive strength is not sufficient, there is a problem that the coating material is often peeled off when transporting the heat insulator.

On the other hand, even when the organic binder or the inorganic binder is applied as an aqueous solution is disclosed, when using a liquid having a large polarity such as water, because the fine particles on the surface of the heat insulating material is agglomerated rapidly, a crack occurs in the heat insulating material or a part of the heat insulating material Deformation such as this depression may occur. For this reason, the amount of water and the amount of liquid in the binder aqueous solution must be controlled very strictly.

Therefore, there is a growing demand for a dry manufacturing method capable of manufacturing a heat insulating material having excellent adhesion between the heat insulating material and the packing material without using an aqueous solution, and a packing material that can withstand high temperatures where the temperature at which the heat insulating material can be used by the packing material is not limited. There is a need for research.

An object of the present invention can be used even in a situation where a continuous heat is applied up to 1700 ℃, it has a smaller than the conventional heat insulating material but has a heat insulating performance of about 3 to 4 times at high temperature, thereby reducing fuel costs, Therefore, to provide a high-performance insulation that can reduce the emission of carbon dioxide.

Another object of the present invention is to provide a manufacturing method of a high-performance heat insulating material that can improve the heat insulating performance by manufacturing a high performance heat insulating material dry without using a binder.

The high-performance heat insulating agent according to an embodiment of the present invention is a heat-insulated compressive body compresses a fibrous material in which inorganic powders and metal oxides are entangled, and a silica cloth woven with silica fibers, covering the heat-resistant compact. silica cloth). The high-performance heat insulating material is prepared by compressing the inorganic powder in a bag prepared by cutting the silica cloth, and then compressing the inorganic powder.

The inorganic powder includes, as a main component, any one selected from the group consisting of silica fine particles, alumina fine particles, aluminum silicate fine particles, and combinations thereof.

The inorganic powder may have a BET surface area of 15 to 500 m ² / g and a particle diameter of 0.003 to 1 μm. When the BET surface area of the inorganic powder is less than 15m ² / g or exceeds 500m ² / g, the high performance insulating material does not exhibit sufficient thermal insulation effect, and when the particle diameter of the inorganic powder exceeds 1㎛, the high performance insulating material is sufficient insulating The effect may not be exhibited, and if it is less than 0.003 µm, there may be a problem that handling is difficult because the volume is too large.

As said inorganic powder, fumed silica can be used more preferably. Unlike general silica, fumed silica is produced by hydrolysis of chlorine chloride in a flame of 1000 ° C. or higher formed of oxygen and hydrogen. The fumed silica shows excellent heat insulating performance because the inside of the particles is almost vacuum, and since the fumed silica is formed at 1000 ° C. or more, there is almost no change in physical properties even in a high temperature region. In addition, when fumed silica is used, the heat insulating performance may be further improved due to excellent miscibility with the silica cloth surrounding the heat insulating compact. Therefore, when the fumed silica is used as the inorganic powder, it is possible to manufacture a high performance heat insulator having excellent heat insulation and high temperature stability.

In consideration of thermal insulation and high temperature stability, the fumed silica may more preferably use a BET surface area of 150 to 250 m ² / g and a content of SiO ₂ of 99% by weight or more.

The thermal insulating compact includes a fibrous material to reinforce durability and to impart cohesion to the inorganic powder. The fibrous material imparts tensile and cohesive forces to the inorganic powder so as to dry produce the thermally insulating compact.

Examples of the fibrous material include inorganic fibers such as glass fibers, alumina fibers, mullite fibers, silica fibers, aluminum silicate fibers, silicate fibers, aluminosilicate fibers, carbon fibers and silicon carbide fibers, or polyethylene fibers, polypropylene fibers, Organic fibers, such as polyamide fiber, or a mixture of the said inorganic fiber and the said organic fiber can be used preferably. The type of fibrous material may be appropriately selected in consideration of the atmosphere, temperature, and the like in which the high performance insulating material is used.

There is no particular limitation on the fiber diameter or length of the fibrous material, but the fiber diameter may be preferably 0.5 to 50 μm, more preferably 5 to 9 μm, and the fiber length is 1 to 15 mm. Can be used preferably, and what is 6-12 mm can be used more preferably.

In addition, the fibrous material may be roving yarn so that the fibrous material is mixed with the inorganic powder so that the inorganic powder is more easily entangled with the fibrous material.

The thermal insulating compact may further include any one metal oxide selected from the group consisting of titanium oxide, zirconium oxide, and combinations thereof. The metal oxide has the effect of improving the heat insulating performance by suppressing the transmission of radiant light. In addition, since the inorganic powder has a very small and light particle size, the inorganic powder alone is disadvantageous in dry forming, and thus, a mixture of the metal oxides having high temperature and chemical stability is used.

The titanium oxide has high temperature stability, has a dielectric constant of about 96, an insulation strength of 20 to 120 Kv / cm, and a dielectric loss of about 0.0003. In addition, titanium oxide is largely present in the rutile type and the brookite anatase phase, and the phase change is performed at 700 ° C. or higher to have a rutile structure. Can be more helpful.

The zirconium oxide may be more helpful in improving high temperature stability, that is, using a high temperature type, that is, tetragonal system.

In addition, the particle diameter of the titanium oxide or the zirconium oxide is preferably 2 to 9㎛. If the particle diameter of the titanium oxide or the zirconium oxide is within the above range, since the refractive index is increased to reduce the amount of light transmitted, the hiding power is excellent, which helps to improve the thermal insulation performance of the high-performance insulating material.

The fibrous material is preferably used in an amount of 1 to 5 parts by weight based on 50 to 80 parts by weight of the inorganic powder, and the metal oxide is preferably used in an amount of 17 to 47 parts by weight based on 50 to 80 parts by weight of the inorganic powder.

When the content of the fibrous material is less than 1 part by weight, the inorganic powder may not be agglomerated well. When the content of the fibrous material is more than 5 parts by weight, the fibrous material may have a greater influence on the thermal insulation performance of the thermally insulating compact, resulting in lower thermal insulation performance. Can be. In addition, when the content of the metal oxide is less than 17 parts by weight, the effect of adding the metal oxide may not be sufficiently exhibited because the radiation may not be sufficiently suppressed. When the content of the metal oxide exceeds 47 parts by weight, the metal oxide may be more effective than the effect of suppressing the radiation. The thermal conductivity of itself becomes large so that a sufficient insulation effect cannot be obtained.

The silica cloth surrounding the insulating compressive body is a silica fiber (fiber) prepared by spinning a silica filament having a thickness of 5 to 9㎛ prepared by spinning the silica melted at a high temperature into a fiber 200 to 800 strands It is manufactured by weaving. However, the structure of the silica cloth in the present invention is not limited thereto, and any silica cloth produced by weaving silica fibers can be used.

The silica cloth is not particularly limited in thickness, but may have a thickness of 0.21 to 3 mm, and when the thickness is 0.27 to 3 mm, it may withstand 1700 ° C. to increase the use temperature range of the high performance insulation.

The silica cloth is composed of 95 to 99.9% by weight of SiO ₂ , and Al ₂ O ₃ , CaO, Fe ₂ O ₃ , MgO, Na ₂ O, TiO, other impurities, and combinations thereof, based on the total content of the silica cloth. It may include 0.1 to 5% by weight of any one selected impurities. The silica cloth preferably contains 95 wt% or more of SiO ₂ based on the total content of the silica cloth, but includes 0.1 wt% or more of the unavoidable impurities. When the silica cloth contains SiO ₂ in an amount of 95 to 99.9% by weight based on the total content of the silica cloth, the heat insulating compressive body and the silica cloth have excellent miscibility, and thus the silica cloth may not be destroyed to 1700 ° C., and thus the heat insulating performance may be maintained. have.

In addition, the silica cloth does not contain asbestos, so it is completely harmless to the human body even at high temperatures.

High-performance heat insulating material according to another embodiment of the present invention can be prepared through the stirring step, the sealing step and the molding step.

First, in the stirring step, the inorganic powder, the fibrous material and the metal oxide are mixed and stirred at 900 to 1000 rpm to prepare a mixture.

Further, optionally, before mixing the inorganic powder, the fibrous material, and the metal oxide at 900 to 1000 rpm, the first stirring may be performed at 800 to 900 rpm, and then the second stirring may be performed at 900 to 1000 rpm.

When the primary stirring speed is 800 to 900rpm is the optimum rotational speed that the fibrous material is transformed into filaments, the inorganic powder and the metal oxide is optimally tangled to the fibrous material, the primary stirring speed Is less than 800 rpm, the fibrous material may not be completely deformed from the roving yarn form to the filament form, so that the inorganic powder and the metal oxide may not be evenly entangled with the fibrous material. After the material is deformed in the form of filaments, the filaments can break and weaken cohesion.

When the second stirring speed is 900 to 1000rpm is the optimum condition that the fibrous material, the inorganic powder and the metal oxide mixed in the first stirring evenly distributed by re-stirring, when the stirring speed is less than 900rpm Sedimentation may occur due to the weight of the powder and the metal oxide, respectively, and the mixing property may be degraded. When the inorganic powder exceeds 1000 rpm, pores are destroyed or dispersion is excessive due to the rotation of the blade, thereby deteriorating thermal insulation properties. You can.

As the inorganic powder, any one selected from the group consisting of silica fine particles, alumina fine particles, aluminum silicate fine particles, and combinations thereof can be used.

The inorganic powder may have a BET surface area of 15 to 500 m ² / g and a particle diameter of 0.003 to 1 μm. When the BET surface area of the inorganic powder is less than 15m ² / g or exceeds 500m ² / g, the high performance insulating material does not exhibit sufficient thermal insulation effect, and when the particle diameter of the inorganic powder exceeds 1㎛, the high performance insulating material is sufficient thermal insulation The effect may not be exhibited, and if it is less than 0.003 µm, there may be a problem that handling is difficult because the volume is too large.

As said inorganic powder, fumed silica can be used more preferably. Unlike general silica, fumed silica is produced by hydrolysis of chlorine chloride in a flame of 1000 ° C. or higher formed of oxygen and hydrogen. The fumed silica shows excellent heat insulating performance because the inside of the particles is almost vacuum, and since the fumed silica is formed at 1000 ° C. or more, there is almost no change in physical properties even in a high temperature region. In addition, when fumed silica is used, the heat insulating performance may be further improved due to excellent miscibility with the silica cloth surrounding the heat insulating compact. Therefore, when the fumed silica is used as the inorganic powder, it is possible to manufacture a high performance heat insulator having excellent heat insulation and high temperature stability.

In consideration of thermal insulation and high temperature stability, the fumed silica may more preferably use a BET surface area of 150 to 250 m ² / g and a content of SiO ₂ of 99% by weight or more.

Examples of the fibrous material include inorganic fibers such as glass fibers, alumina fibers, mullite fibers, silica fibers, aluminum silicate fibers, silicate fibers, aluminosilicate fibers, carbon fibers and silicon carbide fibers, or polyethylene fibers, polypropylene fibers, Organic fibers, such as polyamide fiber, or a mixture of the said inorganic fiber and the said organic fiber can be used preferably. The type of fibrous material may be appropriately selected in consideration of the atmosphere, temperature, and the like in which the high performance insulating material is used.

There is no particular limitation on the fiber diameter or length of the fibrous material, but the fiber diameter may be preferably 0.5 to 50 μm, more preferably 5 to 9 μm, and the fiber length is 1 to 15 mm. Can be used preferably, and what is 6-12 mm can be used more preferably.

In addition, the fibrous material may be roving yarn so that the fibrous material is mixed with the inorganic powder so that the inorganic powder is more easily entangled with the fibrous material.

The metal oxide is any one selected from the group consisting of titanium oxide, zirconium oxide and combinations thereof. The metal oxide has the effect of improving the heat insulating performance by suppressing the transmission of radiant light. In addition, since the inorganic powder has a very small and light particle size, there is a problem in dry forming with only the inorganic powder, so that the high-temperature chemically stable metal oxide may be mixed.

The titanium oxide has high temperature stability, has a dielectric constant of about 96, an insulation strength of 20 to 120 Kv / cm, and a dielectric loss of about 0.0003. In addition, titanium oxide is largely present in the rutile type and the brookite anatase phase, and the phase transition is performed at 700 ° C. or higher to have a rutile structure. Can be more helpful.

The zirconium oxide may be more helpful in improving high temperature stability, that is, using a high temperature type, that is, tetragonal system.

In addition, the particle diameter of the titanium oxide or the zirconium oxide is preferably 2 to 9㎛. If the particle diameter of the titanium oxide or the zirconium oxide is within the above range, since the refractive index is increased to reduce the amount of light transmitted, the hiding power is excellent, which helps to improve the thermal insulation performance of the high-performance insulating material.

The fibrous material is preferably used in an amount of 1 to 5 parts by weight based on 50 to 80 parts by weight of the inorganic powder, and the metal oxide is preferably used in an amount of 17 to 47 parts by weight based on 50 to 80 parts by weight of the inorganic powder.

When the content of the fibrous material is less than 1 part by weight, the inorganic powder may not be agglomerated well. When the content of the fibrous material is more than 5 parts by weight, the fibrous material may have a greater influence on the thermal insulation performance of the thermally insulating compact, resulting in lower thermal insulation performance. Can be. In addition, when the content of the metal oxide is less than 17 parts by weight, the effect of adding the metal oxide may not be sufficiently exhibited because the radiation may not be sufficiently suppressed. When the content of the metal oxide exceeds 47 parts by weight, the metal oxide may be more effective than the effect of suppressing the radiation. The thermal conductivity of itself becomes large so that a sufficient insulation effect cannot be obtained.

Next, in the encapsulation step, the mixture prepared in the stirring step is filled into a bag made of silica cloth and then encapsulated.

The silica cloth is prepared by weaving silica fibers (fiber) prepared by gathering 200 to 800 strands of silica filaments having a thickness of 5 to 9 μm, which are prepared by spinning silica melted at a high temperature into a fibrous form. However, the structure of the silica cloth in the present invention is not limited thereto, and any silica cloth produced by weaving silica fibers can be used.

The silica cloth is not particularly limited in thickness, but may have a thickness of 0.21 to 3 mm, and when the thickness is 0.27 to 3 mm, it may withstand 1700 ° C. to increase the use temperature range of the high performance insulation.

The silica cloth is composed of 95 to 99.9% by weight of SiO ₂ , and Al ₂ O ₃ , CaO, Fe ₂ O ₃ , MgO, Na ₂ O, TiO, other impurities, and combinations thereof, based on the total content of the silica cloth. It may include 0.1 to 5% by weight of any one selected impurities. The silica cloth preferably contains 95 wt% or more of SiO ₂ based on the total content of the silica cloth, but includes 0.1 wt% or more of the unavoidable impurities. When the silica cloth contains SiO ₂ in an amount of 95 to 99.9% by weight based on the total content of the silica cloth, the heat insulating compressive body and the silica cloth have excellent miscibility, and thus the silica cloth may not be destroyed to 1700 ° C., and thus the heat insulating performance may be maintained. have.

In addition, the silica cloth does not contain asbestos, so it is completely harmless to the human body even at high temperatures.

Finally, in the molding step, a high-performance insulating material is manufactured by compressing the bag encapsulated in the sealing step at a pressure of 50986 to 152957 bar.

If the molding pressure is less than 50986 bar in the molding step, it may be difficult to form a shape because it is unsafely formed in the case of using the dry manufacturing method, and if it exceeds 152957 bar, the cell pores of each of the inorganic powders are destroyed to insulate performance. May cause deterioration.

The heat insulating compact prepared by compressing the mixture encapsulated in the silica cloth of the high-performance heat insulating material preferably has a density of 200 to 400 kg / m ³ . When the density of the thermal insulating compact is within the range, the inorganic powders are closed by the compression in the forming step, and since the thermal insulating compact has little latent heat even when heat is applied, excellent thermal insulation performance can be obtained. .

The high-performance heat insulating material of the present invention can be used even in a situation in which continuous heat is applied up to 1700 ° C., while having a smaller volume than a conventional heat insulating material and having a heat insulating performance of about 3 to 4 times at high temperature, fuel cost can be reduced, Accordingly, the emission of carbon dioxide can be reduced.

In addition, the method of manufacturing a high performance heat insulator of the present invention can improve the performance of the high performance heat insulator by manufacturing a high performance heat insulator dry without using a binder.

Hereinafter, specific embodiments of the present invention will be described. However, the embodiments described below are only intended to illustrate or explain the present invention, and thus the present invention should not be limited thereto. In addition, the description is not described herein, so those skilled in the art that can be sufficiently technically inferred the description thereof will be omitted.

Preparation Example: Production of High Performance Insulation Material

(Example 1)

35 parts by weight of rutile titanium dioxide having a particle size of 2 to 9 μm and a thickness of 5 to 9 μm and a length of 6 to 6 with respect to 62 parts by weight of fumed silica having a BET surface area of 150 to 250 m ² / g and a SiO ₂ content of 99.8% 3 parts by weight of 12 mm glass fiber was placed in a primary stirrer and stirred first at 900 rpm for 5 minutes.

The raw material mixed in the primary stirrer was transferred to the secondary stirrer with a diagram pump using air, and then stirred for 2 minutes at 1000 rpm in the secondary stirrer for 5 minutes.

Meanwhile, the first silica cloth having the components summarized in Table 1 was sewn to make a silica cloth bag, and the silica cloth bag was filled with the second stirred mixture and sealed. The silica cloth is prepared by weaving silica fibers (fiber) prepared by gathering 200 to 800 strands of silica filaments having a thickness of 5 to 9 μm, which are prepared by spinning silica melted at a high temperature into a fibrous form.

A silica cloth bag encapsulated with the secondary stirred mixture was compression molded to 152957 bar to prepare a high-performance insulating material dry.

(Example 2)

A high-performance insulating material was prepared in the same manner as in Example 1 except that a silica cloth bag was manufactured using a second silica cloth having the components summarized in Table 1 below.

(Comparative Example 1)

A high-performance heat insulating material was prepared in the same manner as in Example 1 except that a glass cloth bag was manufactured using a glass cloth having the components summarized in Table 1 below.

[Table 1]

Furtherance First silica cloth (% by weight) Second silica cloth (% by weight) Glass cloth (wt%) SiO ₂ 98.92 94.43 56 Al ₂ O ₃ 0.24 1.1 16 CaO 0.57 2.3 15 Fe ₂ O ₃ 0.01 0.9 2 MgO 0.01 0.5 6 Na ₂ O 0.02 0.1 One TiO 0.01 0.2 One Other impurities 0.16 0.47 3

(Example 3)

Except for mixing 47 parts by weight of the titanium dioxide and 3 parts by weight of the glass fiber with respect to 50 parts by weight of the fumed silica in Example 1 was carried out in the same manner as in Example 1 to prepare a high-performance insulating material.

(Example 4)

Except for mixing 17 parts by weight of the titanium dioxide and 3 parts by weight of the glass fiber with respect to 80 parts by weight of the fumed silica in Example 1 was carried out in the same manner as in Example 1 to prepare a high-performance insulating material.

(Example 5)

Except for mixing 54 parts by weight of the titanium dioxide and 6 parts by weight of the glass fiber with respect to 40 parts by weight of the fumed silica in Example 1 was carried out in the same manner as in Example 1 to prepare a high-performance insulating material.

(Example 6)

A high-performance heat insulating material was prepared in the same manner as in Example 1 except that 9.5 parts by weight of titanium dioxide and 0.5 parts by weight of glass fiber were mixed with respect to 90 parts by weight of the fumed silica.

Experimental Example 1

The degree of change of the insulation was determined by continuously transferring heat to the surface of the insulation prepared in Examples 1 and 2 and Comparative Example 1 with a gas torch (direct heat about 1350 ° C.) for about 5 minutes. The surface temperature of the insulation was measured using a temperature measuring instrument (TES1319A k-type).

Photographs of the heat insulating materials prepared in Examples 1 and 2 and Comparative Example 1 before applying heat are shown in FIGS. 1 to 3, respectively, and photographs after applying heat are shown in FIGS. 4 to 6, respectively.

1 to 6, the high-performance heat insulating material prepared in Examples 1 and 2 did not destroy the surface of the heat insulating material even if the temperature of 1700 ℃ for a certain time, the heat insulating material prepared in Comparative Example 1 has a surface temperature of about 400 The surface began to harden when it reached C, and the surface hardened and cracked at 650 ° C.

However, in the case of Example 2, a slight soot occurs when maintained for a certain time at 1700 ℃, in the case of Example 1 did not occur soot. This is considered to be because in Example 1, the content of silica contained in the silica cloth is 95% by weight or more.

Experimental Example 2

The thermal conductivity of the insulation prepared in Example 1 and Comparative Example 1 was measured, and the results are shown in Figure 7 below.

Referring to FIG. 7, it can be seen that the high-performance heat insulating material prepared in Example 1 has better thermal insulation performance as compared to the high-performance heat insulating material prepared in Comparative Example 1 by about 1/3.

[Experimental Example 3]

The thermal conductivity and strength of the high performance insulation prepared in Example 1 and Examples # 3 to 6 were measured.

In the case of Example 5, the content of SiO ₂ in the thermally insulating compact was less than 50 parts by weight, and the dry method could not be molded in the range of 200 to 400 kg / m ³ , and the density was 200 to 400 kg / m. ^In the case of molding out of the range of ³ , pores of the inorganic powder were destroyed, and the thermal insulation performance was lowered.

In the case of Example 6, the thermally insulating compact was broken by impact of the high-performance insulating material produced by the brittleness of the SiO ₂ content of the insulating compressive body exceeding 80 parts by weight and weak, and the inorganic powder became the fibrous material over time. The phenomenon of peeling off and falling off occurred.

In the case of Examples 1, 3, and 4, the insulating compressive body could be molded to have an appropriate density. As a result, pores of the inorganic powder were well preserved, so that the thermal insulation performance was not degraded. It was strong, and the phenomenon that the said inorganic powder did not flow over time did not generate | occur | produce.

As described above, the present invention has been described with reference to only one preferred embodiment, but it is apparent to those skilled in the art that various changes and modifications can be made within the technical spirit of the present invention based on the above embodiments. It is natural that such variations and modifications fall within the scope of the appended claims.

1 is a photograph showing a high-performance heat insulating material prepared in Example 1 of the present invention.

Figure 2 is a photograph showing a high performance insulation prepared in Example 2 of the present invention.

3 is a photograph showing a heat insulating material prepared in Comparative Example 1 of the present invention.

Figure 4 is a photograph after applying heat to the high-performance heat insulating material prepared in Example 1 of the present invention.

5 is a photograph after applying heat to the high-performance heat insulating material prepared in Example 2 of the present invention.

6 is a photograph after applying heat to the high-performance heat insulating material prepared in Comparative Example 1 of the present invention.

7 is a graph showing the thermal conductivity of the heat insulating material prepared in Example 1 and Comparative Example 1 of the present invention.

Claims (7)

delete delete delete delete delete A mixing step of preparing a mixture by stirring 1 to 5 parts by weight of the fibrous material and 17 to 47 parts by weight of the metal oxide at 900 to 1,000 rpm with respect to 50 to 80 parts by weight of the inorganic powder, Encapsulating the mixture in a bag made of silica cloth, and It is a dry manufacturing method of a high-performance heat insulating material comprising a molding step of compressing the encapsulated bag to a pressure of 50,986 to 152,957 bar, The metal oxide is any one selected from the group consisting of titanium oxide, zirconium oxide and combinations thereof, The silica cloth is prepared by weaving silica fibers prepared by spinning 200 to 800 strands of silica filaments having a thickness of 5 μm to 9 μm by spinning dissolved silica in a fibrous form, and having a thickness of 0.27 to 3 mm. 95 to 99.9% by weight of SiO ₂ and Al ₂ O ₃ , CaO, Fe ₂ O ₃ , MgO, Na ₂ O, TiO, other impurities and combinations thereof Dry production method of a high-performance heat insulating material comprising any one of 0.1 to 5% by weight of any impurity. High-performance insulation prepared by the manufacturing method of claim 6.

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