KR20190143300A - Aerogel insulation composition for thin film and aerogel thin film sheet comprising the same - Google Patents

Abstract

The present invention relates to an aerogel heat insulation composition and an aerogel sheet comprising the same. More specifically, provided are an aerogel heat insulation composition comprising aerogel powder, a fibrous heat insulation material, and an organic-inorganic complex binder, and an aerogel sheet comprising an aerogel heat insulation composition layer formed by the same. According to the present invention, a thin film type aerogel heat insulation sheet with improved flexibility, incombustibility, and heat insulation performance can be obtained.

Description

AEROGEL INSULATION COMPOSITION FOR THIN FILM AND AEROGEL THIN FILM SHEET COMPRISING THE SAME}

The present invention relates to an airgel heat insulating composition for a thin film sheet and a thin film airgel sheet comprising the same, and more particularly, to form an airgel heat insulating composition layer including a fibrous heat insulating material and a binder, and includes heat insulating, non-combustible, ductile, and moldability. Together, it relates to a technology for providing an airgel sheet with improved durability.

Insulation is a material for blocking the flow of heat, and is used in various industries including the aircraft, electronic components, automotive industry, as well as in 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 nano-structured transparent or translucent advanced material having a specific surface area of several hundred to 1500 m ² / g and a 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 very efficient super insulation materials that can be used in refrigerators, building materials, automobiles, aircraft, industrial pipelines, and thermos. I am getting it.

However, in general, aerogels produced in the form of powders or particles are very fragile due to their high brittleness, so they are easily broken even by small impacts, and they are difficult to process into very thin 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 aerogel insulating composition capable of forming a thin film type insulating material having improved durability with incombustibility, ductility, and moldability.

Another aspect of the present invention is to provide an airgel sheet comprising such an airgel insulating composition.

According to one aspect of the invention, there is provided an airgel insulating composition comprising an airgel powder, a fibrous insulating material and an organic-inorganic composite binder.

According to another aspect of the present invention, there is provided an airgel sheet comprising an airgel heat insulating composition layer formed of the airgel heat insulating composition of the present invention as described above.

According to the present invention, it is possible to obtain a thin-film airgel insulation sheet having excellent flexibility, non-flammability and insulation performance and improved durability, including an airgel and a fibrous insulation material, and the airgel insulation sheet according to the present invention can be adjusted to a very thin thickness. In addition, since it can be molded into a thin film without a support, it is excellent in formability, so it can be effectively used in a field requiring high insulation performance in a limited space and a narrow space for insulated parts, and especially in a high temperature region where an organic insulation cannot be used. have.

Figure 1 shows an airgel sheet prepared by Example 1.
Figure 2 shows an airgel sheet prepared by Example 2.
Figure 3 shows an airgel sheet prepared by Example 3.
Figure 4 shows an airgel sheet prepared by Example 4.
5 shows the thermal insulation material prepared by Example 5. FIG.
Figure 6 compares the heat resistance of the airgel sheet prepared by Example 1 and Comparative Example 1.
Figure 7 compares the flexibility of the airgel sheets prepared by Example 1 and Comparative Example 2.
Figure 8 compares the uniformity of the airgel sheet prepared by Example 3 and Comparative Example 3.
Figure 9 compares the flexibility of the airgel sheets prepared by Example 1 and Comparative Example 4.
10 compares the durability of the airgel sheets prepared by Example 3 and Comparative Example 5.

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 composition including an airgel composition, a fibrous insulating material, and an organic-inorganic composite binder can be obtained, which can produce a thin-film airgel heat insulating sheet having excellent flexibility, nonflammability, heat insulating performance, and improved durability.

The airgel sheet manufactured using the thermal insulation composition of the present invention can be adjusted to a very thin thickness, can be effectively used in the necessary parts requiring excellent heat insulation performance in a limited formability and limited space, in particular laminated with a separate support A completely independent thin airgel sheet can be obtained which does not require forming a sieve.

More specifically, the airgel insulating composition of the present invention preferably comprises 40 to 90% by weight of the airgel powder, 5 to 40% by weight of the fibrous insulating material and 1 to 20% by weight of the organic-inorganic composite binder, more preferably airgel 60 to 70% by weight of powder, 20 to 30% by weight of fibrous insulating material, and 10 to 15% by weight of organic-inorganic composite binder.

When the airgel thermal insulation composition contains less than 40% by weight of the airgel powder, there is a problem that the thermal insulation effect that can be obtained by the airgel is lowered, and when the airgel thermal insulation composition exceeds 90% by weight, the fibrous insulating material and / or the organic-inorganic composite Since the content of the binder becomes insufficient, ductility and high temperature durability become insufficient, and problems such as minute cracks may occur on the surface of the airgel insulating composition layer.

When the airgel insulating composition contains less than 5% 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 included in an amount exceeding 40% by weight, the airgel insulating composition is reduced. Has difficulty in mixing.

On the other hand, when the airgel insulating composition contains less than 1% by weight of the organic-inorganic composite binder, the bonding strength, the binding force and the temperature resistance is lowered, and when included in excess of 20% by weight, the surface of the airgel insulating composition layer is excessively There is a problem that the rigidity and ductility and moldability are deteriorated and the thermal insulation performance is lowered as the binder content is increased.

The average particle diameter of the airgel powder that can be used in the present invention is preferably 0.001mm to 0.5mm, 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 0.5 mm in terms of viscosity control, blendable amount, uniform mixing possibility, and thin film airgel sheet production.

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.

Furthermore, the airgel insulating composition of the present invention may further comprise at least one other additive selected from the group consisting of alcohols, surfactants, curing agents, thickeners and antifoaming agents, if necessary. Other additives are preferably included in an amount of 0.01 to 1 parts by weight based on 100 parts by weight of the airgel powder.

On the other hand, in the present invention, the fibrous insulating material may be long fibers, short fibers, or a mixture of long fibers and short fibers. The use of short fibers has the advantage of uniform insulation, but the physical properties such as toughness and stiffness may be weakened. When the long fibers are used, the physical properties such as toughness and stiffness may be strengthened, but the heat resistance may be uneven. There is this. Therefore, it is preferable to use a mixture of short fibers and long fibers, in particular, it is preferable that the long fibers and short fibers are mixed in a weight ratio of 1: 9 to 9: 1, more preferably 4: 6 to 6: 4 It is mixed by the weight ratio of.

When the long fiber is included in the weight ratio or less than the weight ratio, the toughness may be weakened and the durability of the thin-film airgel sheet may be reduced, and the short fiber may be included in the weight ratio or the long fiber. When is included in excess of the weight ratio may cause a problem that the sheet is uneven due to the fiber entanglement and the film thickness is not uniform.

The long fiber is more than 50mm in length 100mm, the short fiber is preferably 5mm to 50mm in length. If the length of the long fiber exceeds 100mm, there is a problem that the mixing becomes heterogeneous.

It is preferable that the average diameter of a said cross section is 3-30 micrometers, It is more preferable that an average diameter is 5-20 micrometers, More preferably, the fiber is 10-20 micrometers. If the average diameter of the fiber cross-section is less than 3㎛ there is a problem causing respiratory and dermatological diseases, if it exceeds 30㎛ there is a problem that the thermal conductivity is increased by increasing the cross-sectional area of the fiber.

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.

The organic-inorganic composite binder that can be used in the present invention is an organic binder and an inorganic binder are mixed in a weight ratio of 1: 9 to 9: 1, more preferably organic binder and inorganic binder of 2: 8 to 3: 7 It is mixed by weight ratio. If the organic binder is included in excess of the mixed range of the organic-inorganic composite binder, there is a problem that is vulnerable to high temperature, and if the inorganic binder is included in excess, the ductility and brittleness is significantly lowered, causing breakage or cracking during molding. There is.

The inorganic 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.

On the other hand, the organic binder that can be used in the present invention is preferably an organic binder selected from the group consisting of epoxy, acrylic, polyvinyl alcohol and silicone binder. More preferably, an epoxy or silicone binder is used.

According to the present invention, the organic-inorganic composite binder is used as described above, and by using the organic-inorganic composite binder as described above, it is difficult to maintain the shape of the conventional airgel sheet in the form of a thin film. Solving and can be prepared a thin-film airgel heat insulating sheet does not include a separate support.

Furthermore, the airgel heat insulating composition of the present invention includes a fibrous heat insulating material so as to obtain an airgel sheet having excellent ductility.

The airgel insulating composition of the present invention may be prepared by mixing a fibrous insulating material and an organic-inorganic composite binder in the airgel powder. In more detail, the airgel powder may be mixed with the fibrous insulating material and the organic-inorganic composite binder in the above-mentioned ratio and stirred at 10 to 20 minutes at a speed of 20,000 rpm to 30,000 rpm to sufficiently mix the fibrous insulating material. .

As described above, according to the present invention, the airgel powder may be mixed very stably to obtain a uniform airgel insulating composition.

According to another aspect of the present invention, there is provided an airgel sheet comprising an airgel heat insulating composition layer formed of the airgel heat insulating composition of the present invention described above.

In the airgel sheet of the present invention, the airgel heat insulating composition layer preferably has a thickness of 0.05mm or more and 1mm or less after drying, more preferably 0.1mm to 0.5mm or less. When the airgel heat insulating composition layer is less than 0.05 mm, the heat insulating effect by the airgel heat insulating composition layer tends to be insignificant in the final airgel sheet.

The airgel insulating composition layer of the present invention does not require a separate support.

On the other hand, the airgel sheet of the present invention may be further formed with a fiber layer or a thin film layer on one surface of the airgel heat insulating composition layer.

For example, when the airgel sheet includes both a fiber layer or a thin film layer, a fiber layer or a thin film layer is disposed on one surface of the airgel heat insulating composition layer, and a fiber layer or a thin film layer is formed on both sides of the airgel heat insulating composition layer. It may be.

At this time, the fibrous layer or the thin film layer is not particularly limited as long as the fibrous layer or the thin film layer consisting of a layer of 10-40㎛ thickness. For example, a glass cloth, a silica cloth, a glass sheet made of inorganic fibers such as glass fiber or silica fiber may be used, and as the thin film, a PI (polyimide) film that is organic or withstands a somewhat high temperature may be used. . As such, when the additional thin film 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 one in which two or more layers of fiber or thin film layer and / or two or more layers of airgel heat insulating composition layer is alternately laminated.

The airgel sheet of the present invention as described above may be prepared by the following method. First, the airgel heat insulating composition of the present invention is prepared, and the airgel heat insulating composition layer of the present invention described above is formed. At this time, the method of forming the airgel insulating composition layer is not particularly limited and may be performed by any method known in the art, for example, it may be carried out by a method such as a roller, coating, spraying.

When the airgel insulating composition layer is formed, 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 160.

On the other hand, the drying step is the first drying step 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 160 ℃ The steps can be performed.

If the drying step is performed only at a temperature below 30 ° C., the airgel insulation composition layer may not be completely dried. If the drying step is performed at a temperature above 200 ° C., the airgel sheet may be cracked and / or damaged due to a sudden temperature change. There is a problem that browning phenomenon of the organic material in the hybrid binder occurs.

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, and includes all if the heat insulation is required in drones, ESS battery cell packs, electronic components, refrigerators, building materials, automobiles, aircraft, industrial pipelines, thermos and the like. In particular, it can be effectively applied in fields related to weight reduction, heat shielding, sound absorption, and the like.

Furthermore, the airgel sheet of the present invention may be used alone or alternatively may be used with any insulating material. More specifically, the heat insulating material of the present invention may further include a woven fabric layer such as 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 the woven fabric layer, Or it may be formed in the form of wrapping the woven layer or other heat insulating material, as a result can significantly improve the heat insulating effect and improve the durability of the heat insulating material.

The airgel sheet of the present invention and the insulating material including the same can be used for thermal cover of the lightweight insulating material of aircraft or automobiles, for preventing thermal damage between components, and in particular, it is applied as a heat diffusion preventing material between battery cells of an electric vehicle. It can be used for fire protection by physical shock or heat.

Hereinafter, the present invention will be described in more detail with reference to specific examples. The following examples are merely examples to help understanding of the present invention, but the scope of the present invention is not limited thereto.

Example

One. Airgel  Manufacture of sheets

Example  One

40 g of a binder (20% solids) of a mixture of acrylic and sodium silicate in a weight ratio of 1: 9 was added to an organic-inorganic hybrid hybrid binder in 250 g of silica aerogel (REM TECH) powder having hydrophobicity. Here, 80 g of long fibers (glass fibers) and short fibers (glass fibers) were added and mixed at a weight ratio of 5: 5 to prepare an airgel insulating composition. In this case, the long fibers were used having an average diameter of 3 ㎛ and an average length of 50 mm and short fibers were used having an average diameter of 3 ㎛ and an average length of 10 mm. 40g of the aerogel insulating composition obtained in the above was manufactured in a thin film type airgel insulating sheet having a thickness of 800㎛ sequentially using a roller equipment. The airgel insulation sheet made through the above manufacturing process was first dried for 2 hours at 80 ° C. using a hot air dryer, and then secondly re-dried at 160 ° C. for 4 hours. Little dust was generated in this process, and after drying, it was prepared as shown in FIG.

As a result of measuring the thermal conductivity of the prepared airgel sheet was 26.30mW / mK, almost no dust, showed flexibility as shown in Figure 1 (b) and also showed a strong hydrophobicity as shown in Figure 1 (c) and Figure 1 (d) Like did not burn on fire.

Example  2

200 g of hydrophobic silica aerogel (REM TECH) powder was mixed with an organic-inorganic hybrid hybrid binder and 50 g of a binder (20% solids) of 9: 1 silicon and colloidal silica were mixed in a weight ratio. Here, 60 g of long fibers (ceramic fibers) and short fibers (glass fibers) were added and mixed at a weight ratio of 4: 6 to prepare an airgel insulating composition. At this time, the long fiber was used to have an average diameter of 5㎛ and an average length of 60mm and short fibers of an average diameter of 3㎛ and an average length of 10mm. 30g of the obtained airgel heat insulating composition was sequentially manufactured by using a roller equipment having a thin film type airgel heat insulating sheet having a thickness of 600 μm. The airgel insulation sheet made through the above manufacturing process was first dried for 2 hours at 80 ° C. using a hot air dryer, and then secondly re-dried at 160 ° C. for 4 hours. Little dust was generated in this process, and after drying, it was prepared as shown in FIG.

As a result of measuring the thermal conductivity of the prepared airgel sheet, it was 28.70mW / mK, almost no dust, showed strong hydrophobicity as shown in FIG. 2 (b), and showed flexibility as shown in FIG. It did not burn on fire as d).

Example  3

180 g of REM TECH silica aerogel powder having hydrophobicity is mixed with an organic-inorganic hybrid hybrid binder with 45 g of a binder (20% solids) of epoxy and potassium silicate in a weight ratio of 3: 7. 60 g of long fibers (carbon fibers) were added thereto and mixed to prepare an airgel insulating composition. At this time, the long fiber was used having an average diameter of 3㎛ and an average length of 80mm. 20g of the aerogel insulating composition obtained above was manufactured using a roller equipment, a thin film-type airgel insulating sheet having a thickness of 400 μm sequentially. The airgel insulation sheet made through the above manufacturing process was first dried for 2 hours at 80 ° C. using a hot air dryer, and then secondly re-dried at 160 ° C. for 4 hours. No dust was generated in this process, and after drying, it was manufactured in a roll form as shown in FIG.

As a result of measuring the thermal conductivity of the roll-shaped airgel sheet was 28.31mW / mK, there is almost no dust, showed a strong hydrophobicity as shown in Figure 3 (b) and did not burn the fire as shown in Figure 3 (c).

Example  4

To 215 g of REM TECH silica aerogel powder having hydrophobicity, 75 g of a binder (20% solids) of a polyvinyl alcohol and lithium silicate was mixed with a weight ratio of 6: 4 as an organic-inorganic hybrid hybrid binder. 120 g of long fibers (silica fibers) and short fibers (glass fibers) were added and mixed at a weight ratio of 8: 2 to prepare an insulation paste composition. At this time, the long fiber was used to have an average diameter of 5㎛ and an average length of 45mm and short fibers of an average diameter of 3㎛ and 15mm in average length. 20g of the thermal insulation paste composition obtained above was manufactured using a roller equipment, and a thin film type airgel thermal insulation sheet having a thickness of 300 μm was sequentially manufactured. The airgel insulation sheet made through the above manufacturing process was first dried for 2 hours at 80 ° C. using a hot air dryer, and then secondly re-dried at 160 ° C. for 4 hours. Little dust was generated in this process, and was dried as shown in FIG. 4 (a).

As a result of measuring the thermal conductivity of the prepared airgel sheet was 27.22mW / mK, there is little dust, showed a strong hydrophobicity as shown in Figure 4 (b) and did not burn in 800 ℃ environment as shown in Figure 4 (c).

Comparative example  One

An airgel insulating sheet was prepared by the same procedure as in Example 1 after adding only the organic binder acrylic binder in the same amount to the airgel insulating composition of Example 1 in place of the organic-inorganic composite binder.

6 (a) shows the results of treating the airgel sheets prepared in Comparative Example 1 (left) and Example 1 (right) with a gas stove at a temperature of 800 ° C. or higher for 10 minutes. As can be seen in Figure 6 (a) and (b) in the case of the airgel sheet prepared in Comparative Example 1 was heated carbonized by the gas torch was severely carbonized and cracks were generated by heat. When cracks are generated in this way, heat is transferred to the corresponding portions where the cracks are formed, resulting in a problem of deterioration of thermal insulation.

Comparative example  2

Instead of the organic-inorganic composite binder in the airgel insulating composition of Example 1 only the silica silicate inorganic binder After the addition in the same amount by the same procedure as in Example 1 was prepared an airgel insulating sheet.

7 (a) shows the airgel sheets prepared in Comparative Example 2 (left) and Example 1 (right). As can be seen in Figure 7 (a) and (b) it can be seen that the airgel sheet prepared in Comparative Example 2 is less flexible than the sheet prepared by Example 1. If the flexibility is low, there is a problem of bending or breaking easily due to external impact.

Comparative example  3

Instead of adding short fibers and long fibers to the airgel insulating composition of Example 3, only the long fibers were added in the same amount to prepare an airgel insulation sheet by the same process as in Example 3. 8 shows the airgel sheets prepared in Example 3 (Fig. 8 (a)) and Comparative Example 3 (Fig. 8 (b)).

As can be seen in FIG. 8, in the case of the airgel sheet manufactured in Comparative Example 3, it is difficult to mix uniformly so that long fibers are visible on the surface of the sheet, and these defects are partially heated by heat, thereby causing a decrease in the thermal insulation performance of the insulation.

Comparative example  4

Instead of adding short fibers and long fibers to the airgel insulating composition of Example 2, only the short fibers were added in the same amount to prepare an airgel insulating sheet by the same process as in Example 1.

9 shows the airgel sheets prepared in Example 1 (FIG. 9 (a)) and Comparative Example 4 (FIG. 9 (b)). As can be seen in Figure 9 in the case of the airgel sheet prepared in Comparative Example 4, unlike the sheet prepared in Example 1 when bent at a certain angle or more when the bond between the fibers and the heat resistance is easily broken by external impact or heat Losing problem occurred.

Comparative example  5

Instead of the aerogel insulating composition of Example 3, 40 g of a binder (20% solids) of acrylic and sodium silicate were mixed in a weight ratio of 3: 7 with an organic-inorganic hybrid hybrid binder in 120 g of the airgel aqueous dispersion. Here, 80 g of long fibers (glass fiber) and short fibers (glass fiber) were added and mixed at a weight ratio of 5: 5 to prepare an airgel aqueous dispersion composition, and an airgel insulating sheet was manufactured in the same manner as in Example 3 with the obtained composition. .

As can be seen in Figure 10 (a) and (b) in the case of the airgel sheet prepared in Comparative Example 5 using a high shrinkage of water as a solvent a lot of cracks (crack) occurs on the surface during drying, metal thin film or glass In the absence of a support such as a mat, problems such as particles falling or surface collapse occur, and it is impossible to manufacture a thin film insulating sheet having a thickness of 1000 μm or less.

2. Manufacture of insulating materials

Example  5

To 220 g of REM TECH silica aerogel powder having hydrophobicity, an organic-inorganic hybrid hybrid binder was added and mixed with 85 g of a binder (20% solids) of an acrylic binder and potassium silicate in a weight ratio of 5: 5. 80 g of long fibers (silica fibers) and short fibers (ceramic fibers) were added and mixed at a weight ratio of 5: 5, thereby preparing an insulation paste composition. At this time, the long fiber was used as the average diameter 3㎛ and 50mm average length and the short fiber was 3㎛ average diameter and 5mm average length. 30g of the insulation paste composition obtained as described above was manufactured in a thin film type airgel insulation sheet having a thickness of 165 μm sequentially using a roller equipment. The airgel insulation sheet made through the above manufacturing process was first dried for 2 hours at 80 ° C. using a hot air dryer, and then secondly dried again at 160 ° C. for 4 hours. Little dust was generated in this process, and was dried as shown in FIG. 5 (a).

An adhesive 50㎛ thick PI film was attached to both surfaces of the dried insulating sheet to prepare an airgel insulating tape as shown in FIG. As a result of measuring its thermal conductivity, it was 40 to 45 mW / mK, and there was almost no dust. It showed strong hydrophobicity as shown in FIG. 5 (c) and showed excellent adhesion as shown in FIG. 5 (g).

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.

Claims (12)

An airgel insulating composition comprising an airgel powder, a fibrous insulating material, and an organic-inorganic composite binder.
The airgel insulating composition of claim 1, wherein the airgel insulating composition comprises 40 to 90 wt% of the airgel powder, 5 to 40 wt% of the fibrous insulation material, and 1 to 20 wt% of the organic / inorganic composite binder.
The aerogel heat insulating composition of claim 1, wherein the fibrous insulation material is a mixture of long fibers and short fibers in a weight ratio of 1: 9 to 9: 1.
The airgel insulating composition of claim 3, wherein the long fibers are greater than 50 mm and 100 mm in length.
The aerogel thermal insulation composition of claim 3, wherein the short fibers have a length of 5 mm to 50 mm.
The aerogel insulating composition of claim 1, wherein the fibrous insulating material is at least one selected from the group consisting of glass fibers, ceramic fibers, carbon fibers, and silica fibers.
According to claim 1, The organic-inorganic composite binder is an airgel heat insulating composition, the organic binder and the inorganic binder is mixed in a weight ratio of 1: 9 to 9: 1.
The aerogel thermal insulation composition according to claim 7, wherein the inorganic binder is at least one selected from the group consisting of water glass, silica sol, cement, loess and phosphate binder.
The aerogel thermal insulation composition according to claim 7, wherein the organic binder is at least one selected from the group consisting of epoxy, acrylic, polyvinyl alcohol and silicone binder.
An airgel sheet comprising an airgel heat insulating composition layer formed of the airgel heat insulating composition of any one of claims 1 to 9.
The airgel sheet of claim 10, wherein the airgel heat insulating composition layer has a thickness of 0.05 mm or more and 1 mm or less.
The airgel sheet of claim 10, wherein the airgel sheet further includes a fiber layer or a thin film layer on one surface of the airgel heat insulating composition layer.

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