WO2018221987A1 - Aerogel sheet and insulation material comprising same - Google Patents

Abstract

The present invention relates to an aerogel sheet and an insulation material comprising the same and, more specifically, provides an aerogel sheet and an insulation material comprising the same, the aerogel sheet comprising a thin film support and an aerogel insulation composition layer layered on at least one surface of the thin film support, wherein the aerogel insulation composition layer is formed from an aerogel insulation composition comprising an aerogel water-dispersible composition, a fibrous insulation material, and an inorganic binder.

Description

Airgel Sheets and Insulation Materials Containing the Same

The present invention relates to an airgel sheet and a heat insulating material including the same, and more particularly, to form an airgel heat-insulating composition layer including a fibrous heat insulating material and an inorganic binder on a metal thin film, thereby improving air durability with nonflammability, ductility, and moldability. A technique for providing a sheet and a heat insulating material comprising the same.

Insulation is a material used to block the flow of heat, and is used in various industrial fields including the automobile industry, as well as refrigerators, freezers, and buildings.

The thermal insulation material has to have excellent thermal insulation performance as well as high thermal insulation material, and in addition, it must be able to withstand high temperatures, and also have moldability to be applied to various industrial fields. It is also required to maintain the durability.

Aerogel is a material consisting of silicon oxide (SiO ₂ ) is a transparent or semi-transparent high-tech material of the nano structure having a specific surface area of several hundred to 1500m ² / g, the porosity of 90% or more. Aerogels with such nano-porous structure have low thermal conductivity, so they have high potential as a heat insulator and are evaluated as a very efficient super insulation material that can be used in refrigerators, building materials, automobiles, aircraft, industrial pipelines, and thermos. I am getting it.

However, in general, aerogels prepared in the form of powders or particles are very weak in strength, such as being easily broken by small impacts due to their high brittleness, and are difficult to process in various thicknesses and shapes. There is a problem that the application to the heat insulating material is very difficult. Therefore, in order to solve this problem, a study on a new heat insulating material by forming a composite of aerogel and other materials has been attempted.

The most widely used method of sheeting aerogel to improve durability is a wet process of impregnating an airgel precursor in a fiber or fibrous web, followed by gelation reaction and supercritical drying, for example, in US Pat. No. 5,789,075. Complexes are disclosed. Another method may be to use an organic binder such as an acrylic or silicone binder to improve durability. However, the use of the organic binder is limited to use at high temperatures and a large amount of binder is added to improve the durability, thereby causing a problem of lowering the thermal insulation of the airgel.

On the other hand, a method of forming an airgel heat insulating layer on one surface of the metal plate using an inorganic binder may be considered, but in this case, there may be a problem in that heat insulation is deteriorated due to insufficient formation of cracks in the airgel layer.

Therefore, it is expected that the airgel sheet having improved durability along with non-combustibility, ductility, and moldability and an insulation material including the same may be usefully applied in related fields.

Accordingly, an aspect of the present invention is to provide an airgel sheet having improved durability with non-combustibility, ductility, and moldability.

Another aspect of the invention is to provide a thermal insulation material comprising such an airgel sheet.

According to one aspect of the invention, the thin film support; And an airgel heat insulating composition layer laminated on at least one surface of the thin film support, wherein the airgel heat insulating composition layer is formed of an airgel heat insulating composition comprising an airgel water dispersion composition, a fibrous heat insulating material, and an inorganic binder.

According to another aspect of the present invention, a heat insulating material comprising the airgel sheet of the present invention as described above is provided.

According to the present invention, there is provided an airgel heat-insulating composition that forms a laminate with a metal thin film and includes a fibrous heat-insulating material, by which the airgel sheet having excellent ductility and moldability and improved durability can be obtained. Airgel sheet by can be molded in a variety of forms can be used as a thermal insulation material in a wide range of industries.

Figure 1 shows an exemplary process for producing the airgel sheet of the present invention, (a), layer arrangement cross-sectional view (b), Figure 1 (c) shows a photograph showing the hydrophobicity of the airgel sheet.

FIG. 2 shows an exemplary process (a) and a schematic application example (b) of manufacturing a vehicle exhaust pipe thermal cover by applying the airgel sheet prepared in Example 2. FIG.

Figure 3 (a) is a photograph of the airgel sheet prepared in Example 3, Figure 3 (b) is a photograph showing the ductility and durability of the airgel sheet.

4 is a photograph showing whether cracks occur after molding the airgel sheets prepared by Comparative Example 1 and Example 1. FIG.

Figure 5 shows a photograph after the molding of the airgel sheet prepared by Comparative Example 2.

Figure 6 shows a photograph after the drying of the airgel sheet prepared by Comparative Example 3.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the present invention. However, embodiments of the present invention may be modified in various other forms, and the scope of the present invention is not limited to the embodiments described below.

According to the present invention, an airgel layer is laminated on one surface of a metal thin film, wherein the airgel layer includes a fibrous insulating material and an inorganic binder to improve ductility and durability, and furthermore, when using the airgel sheet, an airgel sheet having excellent moldability is provided. .

More specifically, the airgel sheet of the present invention is a thin film support; And an airgel heat insulating composition layer laminated on at least one surface of the thin film support, wherein the airgel heat insulating composition layer is formed of an airgel heat insulating composition including an airgel water dispersion composition, a fibrous heat insulating material, and an inorganic binder.

The thin film support may be selected from the group consisting of an aluminum thin film, an aluminum alloy thin film, a titanium thin film and a ceramic thin film, and in the case of an aluminum thin film, it is economical, lightweight, and has excellent ductility, and has excellent moldability, and is widely used in airplanes or automobiles. It is used, since the heat reflectance is superior to other metal thin film and does not corrode well, so easy application as a heat insulating material and a vehicle part cover, preferably an aluminum thin film can be used.

Preferably, the thin film support has a thickness of 10 to 100 μm, and when the thickness of the metal thin film is less than 10 μm, the airgel sheet is vulnerable to external force and thus easily broken, thereby deteriorating durability. (crack) may occur, and when the thickness of the metal thin film exceeds 100 μm, adhesion between the metal thin film and the airgel insulating composition layer may decrease during molding due to a difference in physical properties from the airgel insulating composition layer. There is a problem that the application is unsuitable for the field that is low in sex and requires light weight. Preferably, the metal is 20 to 60 µm thick, and more preferably 30 to 40 µm thick.

The airgel insulating composition preferably comprises 50 to 80% by weight of the airgel dispersion composition, 10 to 40% by weight of the fibrous insulating material and 5 to 20% by weight of the inorganic binder, based on the total weight of the airgel insulating composition, more preferably Is 60 to 70% by weight of the airgel aqueous dispersion composition, 20 to 30% by weight of the fibrous insulating material and 10 to 15% by weight of the inorganic binder.

When the airgel thermal insulation composition contains less than 50% by weight of the airgel water dispersion composition, there is a problem in that the thermal insulation effect that can be obtained by the airgel is lowered. When the airgel thermal insulation composition exceeds 80% by weight, the fibrous insulating material and / or the inorganic Since the content of the binder becomes insufficient, ductility and high temperature durability become insufficient, and problems such as fine cracks on the surface of the airgel insulation composition layer due to an increase in water content may occur.

When the airgel insulating composition contains less than 10% by weight of the fibrous insulating material, there is a problem that the ductility is insufficient and thus the moldability is lowered. When the airgel insulating composition is contained in an amount exceeding 40% by weight, the water content is lowered to insulate the airgel. There is difficulty in mixing the composition.

On the other hand, when the airgel thermal insulation composition contains less than 5% by weight of the inorganic binder, there is a problem that the economical and temperature resistance is lowered, the adhesive strength between the thin film support and the airgel heat insulating composition layer is lowered, and exceeds 20% by weight If the surface of the airgel heat insulating composition layer is excessively hard, there is a problem that the ductility and moldability is deteriorated and the heat insulating performance is reduced with the increase of the binder content.

The airgel aqueous dispersion composition comprises water, a super absorbent polymer (SAP) and airgel powder, the weight ratio of the superabsorbent polymer (SAP) and water is 1:50 to 1: 1000, and the superabsorbent polymer (SAP) The weight ratio of the airgel powder is 1:10 to 1: 500.

Superabsorbent polymers (SAP) that can be used in the present invention are selected from the group consisting of polyacrylamide, polyacrylic acid, polymethacrylic acid, polyethylene oxide, polyvinyl alcohol, gelatin, polysaccharides, cellulose or derivatives thereof, and chitosan. It may comprise at least one component or salts thereof, preferably polyacrylic acid or salts thereof.

However, the super absorbent polymer (SAP) that can be used in the present invention is not limited to those having the above components, and any super absorbent polymer (SAP) having a water absorption of 50 g / g or more may be used, and preferably It has a water absorption of 50 to 1000 g / g. More preferably, the water absorption of the super absorbent polymer (SAP) of the present invention is 300 to 500 g / g.

If the absorbency of the super absorbent polymer (SAP) is less than 50 g / g, the ability to absorb water is insufficient. Therefore, a large amount of super absorbent polymer must be used. Therefore, the super absorbent polymer (SAP) remains to affect the final physical properties of the hydrophobic powder. There is a problem.

The weight ratio of the superabsorbent polymer (SAP) and water is preferably 1:50 to 1: 1000. When the superabsorbent polymer (SAP) is included in an amount less than the above range, the amount of superabsorbent polymer (SAP) is equal to that of water. Since the amount is excessively small compared to the amount, there is a problem in that the desired viscosity of the aqueous solution (gel) cannot be reached. When the super absorbent polymer (SAP) is included in an amount exceeding the above range, the amount of the super absorbent polymer (SAP) is excessively large. Since the viscosity of the aqueous solution (gel) is too large, it becomes difficult to mix with the hydrophobic powder, and the weight ratio of the superabsorbent polymer (SAP) and water is more preferably 1: 100 to 1: 500.

On the other hand, the weight ratio of the super absorbent polymer (SAP) and the airgel powder is preferably 1:10 to 1: 500, more preferably 1: 100 to 1: 200.

When the airgel powder is included in an amount less than the above range, the amount of the airgel powder in the mixed aqueous solution is too small, which causes inefficiency in implementing the characteristics of the airgel powder, and when the airgel powder is included in an amount exceeding the above range. There is a problem that it is difficult to obtain a composition of a desired form, such as a flowable gel or liquid form uniformly dispersed because the volume of the airgel powder is excessively large.

The average particle diameter of the airgel powder that can be used in the present invention is preferably 0.001mm to 5mm, more preferably 0.01mm to 0.15mm. It is most preferable to use an airgel powder having an average particle diameter of 0.001 mm to 5 mm in terms of viscosity control, blendable amount, and uniform blendability.

The viscosity of the airgel aqueous dispersion composition is preferably 100 to 200,000cp, more preferably 1,000 to 20,000cp. If the viscosity is less than 100 cp, there is a problem that the airgel and water are not separated by phase separation, and if the viscosity exceeds 200,000 cp, the viscosity becomes excessively high, so that stirring is difficult.

On the other hand, the airgel powder may be a hydrophobic silica airgel powder, the silica airgel powder that can be used in the present invention is any hydrophobic silica known in the art to include all the airgel powder hydrophobically modified porous surface of the airgel It may be an airgel powder, and is not limited to a specific kind of silica airgel powder.

In particular, the hydrophobic silica aerogel refers to a silica airgel hydrophobically surface-treated to prevent water absorption in the air, hydrophobic surface treatment can be carried out by any method known in the art. Although not particularly limited thereto, for example, a silylated silica aerogel may be used.

On the other hand, the airgel aqueous dispersion composition may be used as a mixture of water and alcohol by additionally containing alcohol, wherein the alcohol may be included in an amount of 0.001 to 1 parts by weight of alcohol per 1 part by weight of water. The alcohol is preferably further included when the viscosity of the airgel aqueous dispersion composition is 1000 cps or less.

Furthermore, the airgel water dispersion composition of the present invention may further comprise at least one other additive selected from the group consisting of surfactants, curing agents, thickeners and antifoaming agents, if necessary. Other additives are preferably included in an amount of 0.01 to 100 parts by weight based on 100 parts by weight of the airgel aqueous dispersion composition.

On the other hand, the airgel water dispersion composition of the present invention as described above is prepared by mixing water and superabsorbent polymer (SAP) to prepare an aqueous solution in a gel state, and adding the airgel powder and mixing with stirring It may be, by the method as described above it can obtain an airgel water dispersion composition in which the airgel powder is uniformly dispersed.

In the preparation of the airgel dispersion composition of the present invention, the agitation is preferably performed at 3000 to 10000 rpm when the viscosity of the airgel dispersion composition is 100 or more and less than 5000 cps, and the viscosity of the airgel dispersion composition is 5000 cps or more. In this case, it is preferably performed at 500 to 30000 rpm, and more preferably at least 3 minutes of mixing. The rpm may be higher than the range or the mixing time may be longer than the range, but when the rpm is lower than the range, mixing may occur.

As described above, according to the present invention, the airgel powder is dispersed very stably to obtain an airgel dispersion composition having excellent dispersibility. The airgel dispersion composition of the present invention does not undergo phase separation even for a very long time. In addition, after the water dispersion composition of the airgel powder of the present invention is dried, only the airgel powder and a small amount of superabsorbent polymer (SAP) remain, and the superabsorbent polymer is very small compared to the general binder mixture in terms of weight. Furthermore, since the trace amount is extremely small in terms of volume, it hardly affects the physical properties and properties of the airgel powder.

The airgel heat insulating composition of the present invention may be prepared by mixing a fibrous heat insulating material and an inorganic binder with the airgel water dispersion composition obtained as described above. More specifically, the airgel water dispersion composition may be mixed with the fibrous insulating material and the inorganic binder in the above-mentioned ratio and stirred for 10 to 20 minutes at a speed of 20,000 rpm to 30,000 rpm to allow the fibrous insulating material to be sufficiently mixed. have.

Further, the binder that can be used in the present invention is preferably an inorganic binder selected from the group consisting of water glass, silica sol, cement, loess and phosphate binder. More preferably water glass or silica sol is used. The present invention can obtain an airgel sheet having improved high temperature durability by using an inorganic binder instead of an organic binder vulnerable to high temperature.

On the other hand, the fibrous heat insulating material that can be used in the present invention is at least one selected from glass fiber, silica fiber, ceramic fiber, carbon fiber and the like, preferably using excellent heat insulating performance and ceramic fibers harmless to the human body.

According to the present invention, the inorganic binder is used instead of the organic binder as described above, and the high temperature durability is improved, but the ductility and moldability of the inorganic binder may be deteriorated. Thus, the airgel insulating composition layer of the present invention may further include a fibrous insulating material. It is possible to obtain an airgel sheet having excellent ductility by including.

In the airgel sheet of the present invention, the airgel heat insulating composition layer is preferably 0.2mm to 2mm after drying, more preferably 0.5mm to 1mm or less. When the airgel insulation composition layer is less than 0.2mm, the heat insulation effect by the airgel insulation composition layer tends to be insignificant in the final airgel sheet, and when the airgel insulation layer exceeds 2mm, the difference in physical properties increases due to the increase in thickness. Cracks occur on the surface of the composition layer, resulting in a decrease in productivity and a strong repulsive force against the pressing pressure during pattern forming, thereby degrading formability.

The airgel sheet may be further formed with a fabric layer on the other surface of the airgel heat insulating composition layer is not laminated to the thin film support.

At this time, the fabric layer is not particularly limited as long as it is a woven layer of 10-40㎛ thickness. For example, glass cloth, silica cloth, etc. which consist of inorganic fibers, such as glass fiber and a silica fiber, can be used. Thus, when the additional fabric layer is formed, it is possible to prevent the blowing of fine dust generated during molding, to suppress the occurrence of fine cracks on the surface during drying, and to facilitate handling.

On the other hand, the airgel sheet of the present invention may be a laminate of two or more layers of metal thin film and two or more layers of airgel heat insulating composition, preferably the top layer and the bottom layer of such a laminate is made of a metal thin film. For example, the metal thin film and the airgel insulating composition layer may be alternately laminated two or more times, and finally, the additional metal thin film may be laminated on the externally exposed airgel insulating composition layer.

Furthermore, the airgel sheet of the present invention may further be made of a sheet having a superior ductility and durability by further including a mesh tissue. More specifically, the heat insulating composition layer may be formed to include the mesh structure, and for this purpose, the airgel insulating composition may be applied after the network structure is disposed before the airgel insulating composition layer is applied onto the thin film support.

At this time, the mesh structure is preferably made of inorganic fibers, such as glass fibers, the average diameter of the inorganic fibers is preferably 30 to 100㎛, but using less than the thickness of the intended airgel insulating composition layer.

The airgel sheet of the present invention as described above may be prepared by the following method.

First, as shown in FIG. 1, the metal thin film of the present invention is prepared, and the airgel insulating composition layer of the present invention is formed on at least one surface of the metal thin film. At this time, the method of forming the airgel insulating composition layer on the metal thin film is not particularly limited and may be performed by any method known in the art, for example, it may be performed by a method such as coating, spraying.

If the airgel insulating composition layer is formed on at least one surface of the metal thin film, the temperature of the drying step is not limited, but may be performed in a single step at a temperature of 30 to 200 ℃, preferably 80 to 200 ℃.

On the other hand, the drying step is the first drying step is carried out at a temperature of 30 to 90 ℃, preferably 40 to 80 ℃, and the second drying performed at a temperature of 100 to 200 ℃, preferably 80 to 130 ℃ The steps can be performed.

When the drying step is performed only at a temperature below 30 ° C., the airgel insulation composition layer may not be completely dried. When the drying step is performed at a temperature above 200 ° C., the airgel sheet may be cracked due to a sudden temperature change. there is a problem.

The first drying may be performed for 1 hour to 4 hours, the second drying may be performed for 2 hours to 4 hours and preferably for 4 hours to 6 hours in a single drying.

The drying method is not particularly limited, but may be performed by hot air drying, oven drying, or the like, and preferably by hot air drying.

According to another aspect of the present invention, a heat insulating material comprising the airgel sheet of the present invention as described above is provided.

The heat insulating material of the present invention is not particularly limited to apply to, if the need for heat insulation in refrigerators, building materials, automobiles, aircraft, industrial pipelines, thermos, etc., including all of them, in particular light weight, thermal insulation, sound absorption, etc. It can be effectively applied in related fields.

Furthermore, the airgel sheet of the present invention may be used alone or alternatively may be used with any insulating material. More specifically, the insulating material of the present invention may further include a glass fiber layer laminated on the airgel sheet of the present invention, wherein the airgel sheet of the present invention is simply laminated with a glass fiber layer, or a glass fiber layer or It may be formed in the form of surrounding other insulating material, and as a result it is possible to significantly improve the insulation effect and improve the durability of the insulation material.

For example, when the airgel sheet of the present invention is manufactured in a form surrounding the glass fiber layer, the airgel sheet of the present invention having a larger area is disposed on both sides of the glass fiber layer, and the airgel sheet remaining at the edge of the glass fiber layer is bonded, wound, or the like. By sealing by bonding together, a lightweight heat insulating material excellent in the heat insulating effect can be obtained. Such thermal insulation materials can be used in particular as heat protectors such as exhaust pipes and / or mufflers.

In this case, the glass fiber layer may be a single layer or a form in which a plurality of glass fibers are stacked.

Such an airgel sheet of the present invention and the heat insulating material including the same can be applied to the exhaust pipe insulation cover, thermal damage prevention, etc. of the lightweight insulating material of the vehicle in particular.

 The embodiments are only examples to help understanding of the present invention, but the scope of the present invention is not limited thereto.

One. Airgel  Manufacture of sheets

Example  One

(1) Preparation of Airgel Insulating Composition

Gel aqueous solution was prepared by mixing 6 g of Super Absorbent Polymers (SAP) manufactured by LG Chem with 1,500 g of water. 280 g of the aerogel powder having a particle size of about 5 mm was added to the aqueous solution and mixed at a speed of 30,000 rpm for 10 minutes using a high speed stirrer to obtain a water-dispersed airgel water dispersion composition in which the airgel was uniformly dispersed.

30 g of ceramic fibers and 100 g of an inorganic binder (water glass) were sequentially added to the airgel aqueous dispersion composition obtained above, followed by mixing for 10 minutes at 20,000 rpm in a high speed stirrer to obtain an airgel insulating composition.

(2) Preparation of Airgel Sheet

As shown in Fig. 1 (a), the aerogel insulating composition obtained in (1) was applied to one surface of an aluminum thin film having a thickness of 30 μm and 30 × 80 cm using a screen printer with a thickness of 0.7 mm, and then 30 μm silica was placed thereon. The fabric was laminated and first dried for 2 hours in a hot air at a temperature of 40 to 60 ° C. and finally dried for 2 hours at a temperature of 120 ° C. for 4 hours to obtain an airgel sheet. After the final drying, the thickness of the airgel heat insulating composition layer was 0.5 mm, and showed a thermal conductivity value of 36 mW / mK and hydrophobicity as shown in FIG. 1 (c).

Example  2

The same airgel thermal insulation composition as in Example 1 (1) was applied to 40 μm of the aluminum thin film to a thickness of 1.5 mm, followed by hot air drying for 3 hours in a 60 ° C. environment, and then redrying for 2 hours at 120 ° C. To prepare an airgel sheet. The prepared airgel sheet was manufactured as an exhaust cover for a vehicle exhaust pipe according to an exemplary process of manufacturing as shown in FIG. 2.

Example  3

The same airgel thermal insulation composition as in Example 1 (1) was placed on a thin aluminum film 30μm mesh glass structure and then applied to a thickness of 1mm to dry for 4 hours at 130 ℃ according to the hot air drying method 3 ( An aerogel composite thermal insulation fabric was prepared as in a). And excellent ductility and durability as shown in Figure 3 (b).

2. Airgel  Evaluation of property of sheet

Comparative example  One

(1) Airgel Sheet Durability

A gel aqueous solution was prepared by mixing 6 g of superabsorbent polymer (SAP) (manufacturer, product name) with 1,500 g of water. 300 g of airgel powder having a particle size of about 10 mm was added to the aqueous solution and mixed at a speed of 30,000 rpm for 15 minutes using a high speed stirrer to obtain a water dispersion airgel dispersion composition in which the airgel was uniformly dispersed.

30 g of ceramic fibers and 80 g of an inorganic binder (water glass) were sequentially added to the obtained airgel aqueous dispersion composition, followed by mixing at 20,000 rpm in a high speed stirrer for 10 minutes to obtain an airgel insulating composition. An airgel sheet was prepared in the same manner as in Example 1 except that the airgel insulating composition thus obtained was applied to an aluminum sheet having a thickness of 1.25 mm instead of an aluminum thin film. As can be seen in Figure 4 (a) it could be confirmed that the phenomenon that the crack is formed and broken in the airgel heat insulating composition layer by the physical external force during molding. When cracks are generated in this way, when the insulation material is manufactured using the cracks, heat is transferred to the corresponding portions where the cracks are formed, resulting in a problem of deterioration of heat insulation.

However, in the case of the airgel sheet manufactured in Example 1 as shown in FIG. there was

Comparative example  2

An airgel sheet was prepared in the same manner as in Example 1 except that the fibrous insulating material was not added to the airgel insulating composition of Example 1.

As a result, it was confirmed that the airgel sheet was not smoothly obtained when the fibrous insulating material was not added as shown in FIG. 5.

Comparative example  3

An airgel sheet was prepared in the same manner as in Example 1 except that the airgel insulating composition of Example 1 was applied at 3 mm.

As a result, as shown in FIG. 6, it was confirmed that cracks occurred in the surface layer after drying.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and changes can be made without departing from the technical spirit of the present invention described in the claims. It will be obvious to those of ordinary skill in the field.

[Description of the code]

10: thin film support

20: airgel insulation composition layer

30: fabric layer

Claims (12)

Thin film support; And It comprises an airgel heat insulating composition layer laminated on at least one surface of the thin film support, The airgel insulating composition layer is formed of an airgel insulating composition comprising an airgel water dispersion composition, a fibrous insulating material and an inorganic binder, airgel sheet. The airgel sheet of claim 1, wherein the thin film support is selected from the group consisting of an aluminum thin film, an aluminum alloy thin film, a titanium thin film and a ceramic thin film. The airgel sheet of claim 1, wherein the thin film support is 10 to 100 μm thick. The airgel sheet of claim 1, wherein the airgel thermal insulation composition comprises 50 to 80 wt% of the airgel aqueous dispersion composition, 10 to 40 wt% of the fibrous insulation material, and 5 to 20 wt% of the inorganic binder. According to claim 1, wherein the airgel water dispersion composition comprises water, superabsorbent polymer (SAP) and airgel powder, the weight ratio of the superabsorbent polymer (SAP) and water is 1:50 to 1: 1000, the superabsorbent Airgel sheet, wherein the weight ratio of the polymer (SAP) and the airgel powder is 1:10 to 1: 500. The method of claim 5 wherein the superabsorbent polymer (SAP) is from the group consisting of polyacrylamide, polyacrylic acid, polymethacrylic acid, polyethylene oxide, polyvinyl alcohol, gelatin, polysaccharides, cellulose or derivatives thereof, and chitosan. An airgel sheet comprising at least one selected component or salt thereof. The aerogel sheet of claim 1, wherein the fibrous insulation material is at least one selected from the group consisting of glass fibers, ceramic fibers, carbon fibers, and silica fibers. The airgel sheet of claim 1, wherein the inorganic binder is at least one selected from the group consisting of water glass, silica sol, cement, loess and phosphate binder. The airgel sheet of claim 1, wherein the airgel heat insulating composition layer has a thickness of 0.2 mm to 2 mm. The airgel sheet of claim 1, wherein the airgel sheet further includes a fabric layer on the other surface of the airgel insulation composition layer on which the thin film support is not laminated. The airgel sheet of claim 1, wherein the airgel sheet further comprises a mesh structure made of inorganic fibers. A heat insulating material comprising the airgel sheet of claim 1.

Images