KR102145611B1 - Aerogel insulation composition for thin film and aerogel thin film sheet comprising the same - Google Patents

Abstract

The present invention relates to an airgel insulation composition and an airgel sheet comprising the same, and more particularly, an airgel insulation composition comprising an airgel powder, a fibrous insulation material and an organic-inorganic composite binder, and an airgel sheet comprising an airgel insulation composition layer formed therefrom Is provided.

Description

Airgel insulation composition for thin-film sheet, and thin-film airgel sheet containing the same {AEROGEL INSULATION COMPOSITION FOR THIN FILM AND AEROGEL THIN FILM SHEET COMPRISING THE SAME}

The present invention relates to an airgel insulation composition for a thin-film sheet and a thin-film airgel sheet comprising the same, and more particularly, to form an airgel insulation composition layer including a fibrous insulation material and a binder, and heat insulation, non-flammability, ductility, and moldability including the same. It relates to a technology for providing an airgel sheet with improved durability together.

The insulating material is a material for blocking the flow of heat, and is used not only when building refrigerators, freezer warehouses, and buildings, but also in various industrial fields including aircraft, electronic parts, and automobile industries.

As a performance that such an insulator must have, it must have excellent thermal insulation performance due to its low thermal conductivity. In the case of a high-temperature insulator, it must be able to withstand high temperatures, and furthermore, it must have moldability so that it can be applied to various industrial fields. Durability is also required to continuously maintain.

Airgel is a material made of silicon oxide (SiO ₂ ), and is a nanostructured transparent or semi-transparent high-tech material having a specific surface area of about several hundred to 1500m ² /g and a porosity of 90% or more. Aerogels with such a nanoporous structure have high potential as an insulation material because of their low thermal conductivity characteristics, and are evaluated as a very efficient ultra-insulating material that can be used for refrigerators, building materials, automobiles, aircraft, industrial pipelines, and thermos. Are receiving.

However, in general, airgels manufactured in the form of powders or particles have very weak strength, such as being easily broken even with small impacts due to their high brittleness, and are difficult to process into very thin thicknesses and shapes, so even with excellent thermal insulation properties, airgels alone There is a problem that it is very difficult to apply it as an insulating material. Therefore, in order to solve this problem, research on a new insulation material through the formation of a composite between airgel and other materials has been attempted.

The most widely used method of improving durability by forming an airgel into a sheet is a wet process in which a fiber or a fiber web is impregnated with an airgel precursor, followed by a gelation reaction and supercritical drying.For example, U.S. Patent No. 5,789,075 discloses a mat type Complexes are disclosed. Another method may improve durability by using an organic binder such as an acrylic or silicone binder. However, the use of the organic binder is limited at high temperatures, and a large amount of binder is added to improve durability, resulting in a problem of deteriorating the thermal insulation of the airgel.

On the other hand, it is possible to consider a method of forming an airgel insulating layer on one surface of a metal plate using an inorganic binder, but in this case, due to insufficient ductility during molding, cracks in the airgel layer may occur, resulting in a problem of deteriorating thermal insulation.

Accordingly, when an airgel sheet with improved durability and an insulating material including the same are provided with non-flammability, ductility, and moldability, it is expected to be usefully applied in related fields.

Accordingly, one aspect of the present invention is to provide an airgel insulating composition capable of forming a thin film-type insulating material having improved durability with non-combustibility, 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 present invention, there is provided an airgel insulation composition comprising an airgel powder, a fibrous insulation material, and an organic-inorganic composite binder.

According to another aspect of the present invention, there is provided an airgel sheet including an airgel insulation composition layer formed of the airgel insulation 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-combustibility and thermal insulation performance, and improved durability, including airgel and fibrous insulation materials, and the airgel insulation sheet according to the present invention can be adjusted to a very thin thickness. And, since it can be formed into a thin film without a support, it has excellent formability, so it can be effectively used in areas requiring high insulation performance in limited spaces and narrow parts insulation spaces, and especially in high temperature areas where organic insulation cannot be used. have.

1 shows an airgel sheet prepared according to Example 1.
2 shows an airgel sheet prepared according to Example 2.
3 shows an airgel sheet prepared according to Example 3.
4 shows an airgel sheet manufactured according to Example 4.
5 shows a heat insulating material prepared according to Example 5.
6 is a comparison of the heat resistance of the airgel sheets prepared according to Example 1 and Comparative Example 1.
7 is a comparison of the flexibility of the airgel sheets prepared according to Example 1 and Comparative Example 2.
8 is a comparison of the uniformity of the airgel sheets prepared according to Example 3 and Comparative Example 3.
9 is a comparison of the flexibility of the airgel sheets prepared according to Example 1 and Comparative Example 4.
10 is a comparison of the durability of the airgel sheets manufactured according to Example 3 and Comparative Example 5.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. 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, it is possible to obtain an airgel insulation composition capable of manufacturing a thin film type airgel insulation sheet having excellent flexibility, non-flammability and insulation performance and improved durability, including an airgel composition, a fibrous insulation material, and an organic-inorganic composite binder.

The airgel sheet manufactured by using the heat insulating composition of the present invention can be adjusted to a very thin thickness, has excellent moldability, and can be effectively used for areas requiring high heat insulation performance in a limited space. In particular, it is laminated together with a separate support. It is possible to obtain a completely independent thin film airgel sheet that is not required to form a sieve.

More specifically, the airgel insulation composition of the present invention preferably contains 40 to 90% by weight of airgel powder, 5 to 40% by weight of fibrous insulation material, and 1 to 20% by weight of organic-inorganic composite binder, and more preferably airgel. It contains 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 insulation composition contains less than 40% by weight of airgel powder, there is a problem that the insulation effect that can be obtained by the airgel is deteriorated, and when it exceeds 90% by weight, the fibrous insulation material and/or organic-inorganic composite Since the content of the binder becomes insufficient, ductility and high-temperature durability become insufficient, and problems such as fine cracks may occur on the surface of the airgel insulating composition layer.

When the airgel insulation composition contains less than 5% by weight of the fibrous insulation material, there is a problem that the ductility is insufficient and thus moldability is deteriorated, and when it is contained in more than 40% by weight, the moisture content is lowered and the airgel insulation composition There is a difficulty in mixing.

On the other hand, when the airgel insulation composition contains less than 1% by weight of the organic-inorganic composite binder, bonding strength, binding strength, and temperature resistance are deteriorated, and when it is included in more than 20% by weight, the surface of the airgel insulation composition layer is excessive. Since it becomes hard, ductility and moldability are deteriorated, and thermal insulation performance is deteriorated with an increase in the amount of binder.

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 0.001mm to 0.5mm in terms of viscosity control, mixing possible amount, uniform mixing possibility, and thin film type airgel sheet manufacturing.

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

In particular, the hydrophobic silica aerogel refers to a silica aerogel that has been hydrophobically surface-treated to prevent moisture absorption in the air, and the hydrophobic surface treatment may be performed by any method known in the art. Although not particularly limited thereto, for example, a silylated silica aerogel may be used.

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

Meanwhile, in the present invention, the fibrous insulating material may be a long fiber, a short fiber, or a mixture of a long fiber and a short fiber. In the case of using short fibers, the insulation properties are uniform, but physical properties such as toughness and stiffness may be weakened, and when long fibers are used, physical properties such as toughness and stiffness are reinforced, but heat resistance properties may become uneven There is this. Therefore, it is preferable to use a mixture of short fibers and long fibers, in particular, long fibers and short fibers are preferably mixed in a weight ratio of 1:9 to 9:1, more preferably 4:6 to 6:4 It is mixed in a weight ratio of.

If long fibers are included in less than the weight ratio or short fibers are included in excess of the weight ratio, there may be a problem that the toughness is weakened and the durability of the thin-film airgel sheet is deteriorated, and short fibers are included in less than the weight ratio or long fibers When is included in excess of the weight ratio, a problem may occur in that the sheet becomes non-uniform and the thickness of the thin film is not homogeneous due to the phenomenon of coagulation between fibers.

The long fibers will have a length of more than 50 mm and 100 mm, and the short fibers are preferably 5 mm to 50 mm in length. When the length of the long fibers exceeds 100 mm, there is a problem in that the mixing becomes heterogeneous.

The fiber preferably has an average cross-sectional diameter of 3 to 30 μm, more preferably 5 to 20 μm, and even more preferably 10 to 20 μm. When the average diameter of the fiber cross-section is less than 3 μm, there is a problem of causing respiratory and skin diseases, and when it exceeds 30 μm, the cross-sectional area of the fiber increases, thereby increasing the thermal conductivity.

On the other hand, the fibrous 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, and preferably, ceramic fiber having excellent thermal insulation performance and harmless to the human body is used.

The organic-inorganic composite binder that can be used in the present invention is a mixture of an organic binder and an inorganic binder in a weight ratio of 1:9 to 9:1, more preferably an organic binder and an inorganic binder of 2:8 to 3:7. It is mixed by weight ratio. When the organic binder is contained in an excessive amount outside the blending range of the organic-inorganic composite binder, there is a problem of being vulnerable to high temperatures, and when an excessive amount of the inorganic binder is included, the ductility and brittleness are remarkably deteriorated, 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, ocher and phosphate binders. More preferably, water glass or silica sol is used.

Meanwhile, 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 binders. 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 the use of such an organic-inorganic composite binder, it is difficult to maintain the shape and become fragile when manufacturing a conventional thin-film airgel sheet alone. It is possible to solve and manufacture a thin-film airgel insulation sheet that does not include a separate support.

Furthermore, the airgel heat insulating composition of the present invention includes a fibrous heat insulating material, so that an airgel sheet having excellent ductility can be obtained.

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

As described above, according to the present invention, the airgel powder is mixed very stably to obtain a uniform airgel insulation composition.

According to another aspect of the present invention, there is provided an airgel sheet comprising an airgel insulating composition layer formed of the airgel 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, and more preferably 0.1mm to 0.5mm or less. When the airgel insulation composition layer is less than 0.05mm, the heat insulation effect by the airgel insulation composition layer tends to be insignificant in the final airgel sheet.

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

Meanwhile, in the airgel sheet of the present invention, a fibrous layer or a thin film layer may be additionally formed on one surface of the airgel 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 side of the airgel insulation composition layer, and a fiber layer or a thin film layer is formed on both sides of the airgel insulation composition layer. May be.

In this case, the fibrous layer or thin film layer is not particularly limited as long as it is a fibrous layer or thin film layer composed of a layer having a thickness of 10-40 μm. For example, glass cloth, silica cloth, glass sheet, etc. made of inorganic fibers such as glass fiber and silica fiber may be used, and as a thin film, a PI (polyimide) film that withstands organic but somewhat high temperatures may be used. . When the additional thin film layer is formed as described above, it is possible to prevent the blowing of fine dust generated during molding, suppress the occurrence of fine cracks on the surface during drying, and facilitate handling.

Meanwhile, the airgel sheet of the present invention may be formed by alternately stacking two or more fibrous layers or thin film layers and/or two or more airgel insulation composition layers.

The airgel sheet of the present invention as described above can be manufactured by the following method. First, to prepare the airgel insulation composition of the present invention, to form the airgel insulation composition layer of the present invention described above. In this case, the method of forming the airgel heat insulating composition layer is not particularly limited, and may be performed by any method known in the art, and may be performed by, for example, a method such as roller, coating, or spray.

When the airgel insulation 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°C, preferably 80 to 160.

On the other hand, the drying step is a first drying step performed at a temperature of 30 to 90 ℃, preferably 40 to 80 ℃, and a secondary drying performed at a temperature of 100 to 200 ℃, preferably 80 to 160 ℃ Steps can be performed.

When the drying step is performed only at a temperature of less than 30°C, there is a problem that the airgel insulating composition layer is not completely dried, and when it is performed at a temperature exceeding 200°C, the airgel sheet is cracked and/or There is a problem that browning of organic matter 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 to 4 hours, and it is preferable to perform a single drying for 4 to 6 hours.

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

According to another aspect of the present invention, there is provided an insulating material including the airgel sheet of the present invention as described above.

The application target of the insulation material of the present invention is not particularly limited, and includes all of them where insulation is required for unmanned drones, ESS battery cell packs, electronic parts, refrigerators, building materials, automobiles, aircraft, industrial pipelines, thermos, etc. In particular, it can be effectively applied in fields related to weight reduction, heat shielding and sound absorption.

Furthermore, the airgel sheet of the present invention may be used alone or alternatively may be used with any heat insulating material. More specifically, the heat insulating material of the present invention may further include a woven material 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 material layer, Alternatively, it may be formed in a form surrounding the woven material layer or other insulating material, and as a result, the insulating effect may be remarkably improved and the durability of the insulating material may be improved.

The airgel sheet of the present invention and the insulating material including the same can be used as a thermal insulation cover for lightweight insulating materials for aircraft or automobiles, for preventing thermal damage between parts, etc., and especially for preventing heat diffusion between electric vehicle battery cells. It can be used to prevent fire due to physical impact or heat.

Hereinafter, the present invention will be described in more detail through specific examples. The following examples are only examples to aid understanding of the present invention, and the scope of the present invention is not limited thereto.

Example

One. Airgel Sheet manufacturing

Example One

To 250 g of hydrophobic silica aerogel (REM TECH) powder, 40 g of a binder (solid content 20%) mixed with acrylic and sodium silicate in a weight ratio of 1:9 as an organic-inorganic hybrid binder was mixed. Here, 80 g of long fibers (glass fibers) and short fibers (glass fibers) in a weight ratio of 5:5 were added and mixed to prepare an airgel insulation composition. At this time, the long fibers having an average diameter of 3 μm and an average length of 50 mm were used, and the short fibers having an average diameter of 3 μm and an average length of 10 mm were used. 40g of the airgel insulation composition obtained above was sequentially manufactured with a thin film type airgel insulation sheet having a thickness of 800㎛ using a roller device. The airgel insulation sheet made through the above manufacturing process was first dried at 80°C for 2 hours using a hot air dryer and then re-dried again at 160°C for 4 hours. In this process, no dust was generated, and after drying, it was manufactured as shown in FIG. 1(a).

As a result of measuring the thermal conductivity of the prepared airgel sheet, it was 26.30mW/mK, almost no dust, and showed flexibility as shown in FIG. 1(b), and also showed strong hydrophobicity as shown in FIG. 1(c), and FIG. 1(d) Likewise, it was not burned.

Example 2

Into 200 g of hydrophobic silica aerogel (REM TECH) powder, 50 g of a binder (solid content 20%) mixed with silicon and colloidal silica in a weight ratio of 9:1 as an organic-inorganic hybrid binder was mixed. Here, 60 g of long fibers (ceramic fibers) and short fibers (glass fibers) in a weight ratio of 4:6 were added and mixed to prepare an airgel insulation composition. At this time, the long fibers had an average diameter of 5 μm and an average length of 60 mm, and the short fibers were used with an average diameter of 3 μm and an average length of 10 mm. 30g of the airgel insulating composition obtained above was sequentially manufactured with a thin film type airgel insulating sheet having a thickness of 600 μm using a roller device. The airgel insulation sheet made through the above manufacturing process was first dried at 80°C for 2 hours using a hot air dryer and then re-dried again at 160°C for 4 hours. No dust was generated during this process, and after drying, it was manufactured as shown in FIG. 2(a).

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. 2(c), and also shown in FIG. Like d), it did not burn.

Example 3

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

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

Example 4

To 215 g of REM TECH silica aerogel powder having hydrophobicity, 75 g of a binder (solid content 20%) in which polyvinyl alcohol and lithium silicate were mixed in a weight ratio of 6:4 as an organic-inorganic hybrid binder were mixed and mixed. Here, 120 g of long fibers (silica fibers) and short fibers (glass fibers) in a weight ratio of 8:2 were added and mixed to prepare an insulating paste composition. At this time, the long fibers had an average diameter of 5 μm and an average length of 45 mm, and the short fibers were used with an average diameter of 3 μm and an average length of 15 mm. 20 g of the heat-insulating paste composition obtained above was sequentially manufactured into a thin-film airgel insulating sheet having a thickness of 300 μm using a roller device. The airgel insulation sheet made through the above manufacturing process was first dried at 80°C for 2 hours using a hot air dryer and then re-dried again at 160°C for 4 hours. In this process, no dust was generated, and after drying, it was prepared as shown in FIG. 4(a).

As a result of measuring the thermal conductivity of the prepared airgel sheet, it was 27.22mW/mK, almost no dust, showed strong hydrophobicity as shown in FIG. 4(b), and did not burn in an 800°C environment as shown in FIG. 4(c).

Comparative example One

In the airgel insulation composition of Example 1, instead of the organic-inorganic composite binder, only an acrylic binder, which is an organic binder, was added in the same amount, and then an airgel insulation sheet was manufactured by the same procedure as in Example 1.

6(a) shows the results of heating the airgel sheets prepared in Comparative Example 1 (left) and Example 1 (right) with a gas torch for 10 minutes at a temperature of 800° C. or higher. 6(a) and (b), in the case of the airgel sheet prepared in Comparative Example 1, the portion heated by the gas torch was severely carbonized, and cracks were generated by heat. When a crack occurs in this way, heat is transferred to the corresponding portion where the crack is formed, thereby causing a problem of deteriorating thermal insulation.

Comparative example 2

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

Figure 7 (a) shows the airgel sheet prepared in Comparative Example 2 (left) and Example 1 (right). As can be seen in FIGS. 7 (a) and (b), it can be seen that the airgel sheet manufactured in Comparative Example 2 has less flexibility than the sheet manufactured in Example 1. If the flexibility is poor, there is a problem that it is bent or easily broken by an external impact.

Comparative example 3

Instead of adding short fibers and long fibers to the airgel insulation composition of Example 3, only long fibers were added in the same amount, and then an airgel insulation sheet was manufactured by the same procedure as in Example 3. 8 shows the airgel sheet 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 prepared in Comparative Example 3, it is difficult to uniformly mix so that long fibers are visible on the sheet surface, and these defects are partially heated by heat, which causes deterioration of the thermal insulation performance of the insulating material.

Comparative example 4

Instead of adding short fibers and long fibers to the airgel insulation composition of Example 2, only short fibers were added in the same amount, and then an airgel insulation sheet was manufactured by the same procedure as in Example 1.

9 shows the airgel sheet 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 the sheet is bent at a certain angle or more, the bonding and heat resistance between the fibers are poor, so it is easily broken by external shock or heat. A losing problem occurred.

Comparative example 5

In place of the airgel insulating composition of Example 3, 40 g of a binder (solid content 20%) mixed with acrylic and sodium silicate in a weight ratio of 3:7 as an organic-inorganic hybrid binder was added to 120 g of the airgel aqueous dispersion and mixed. Here, 80 g of long fibers (glass fibers) and short fibers (glass fibers) were added and mixed in a weight ratio of 5:5 to prepare an airgel water dispersion composition, and an airgel insulation sheet was prepared in the same procedure as in Example 3 with the obtained composition. .

As can be seen in FIGS. 10(a) and (b), in the case of the airgel sheet prepared in Comparative Example 5, water with a high shrinkage rate was used as a solvent, and when dried, many cracks were generated on the surface, and a metal thin film or glass In the absence of a support such as a mat, problems such as dropping of particles or collapse of the surface occur, and it is impossible to manufacture a thin-film insulation sheet of less than 1000㎛.

2. Manufacturing of insulating materials

Example 5

Into 220 g of REM TECH silica aerogel powder having hydrophobicity, 85 g of a binder (solid content 20%) mixed with an acrylic binder and potassium silicate in a weight ratio of 5:5 as an organic-inorganic hybrid binder was added and mixed. Here, 80 g of long fibers (silica fibers) and short fibers (ceramic fibers) in a weight ratio of 5:5 were added and mixed to prepare an insulating paste composition. At this time, the long fibers had an average diameter of 3 μm and an average length of 50 mm, and the short fibers were used with an average diameter of 3 μm and an average length of 5 mm. 30 g of the heat insulating paste composition obtained above was sequentially prepared with a thin film aerogel heat insulating sheet having a thickness of 165 μm using a roller equipment. The airgel insulation sheet made through the above manufacturing process is first dried at 80°C for 2 hours using a hot air dryer, and then re-dried again at 160°C for 4 hours. No dust was generated during this process, and after drying, it was manufactured as shown in FIG. 5(a).

An airgel insulation tape was prepared as shown in FIG. 5(b) by attaching a 50 μm-thick PI film with adhesive properties to the dried insulation sheet on both sides. As a result of measuring its thermal conductivity, it was 40-45mW/mK, almost no dust, and showed strong hydrophobicity as shown in FIG. 5(c), and 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 variations are possible 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)

Based on the total weight of the airgel insulation composition, a fibrous insulation material in which 40 to 90% by weight of airgel powder, long fibers having a length of more than 50 mm and less than 100 mm and short fibers having a length of 5 mm or more and 50 mm or less are mixed in a weight ratio of 1:9 to 9:1. To 40% by weight and 1 to 20% by weight of an organic-inorganic composite binder mixed with an organic binder and an inorganic binder in a weight ratio of 1:9 to 9:1, airgel insulation composition.
delete delete delete delete The airgel insulation composition according to 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.
delete The airgel insulation composition of claim 1, wherein the inorganic binder is at least one selected from the group consisting of water glass, silica sol, cement, ocher and phosphate binder.
The airgel insulation composition of claim 1, wherein the organic binder is at least one selected from the group consisting of epoxy, acrylic, polyvinyl alcohol, and silicone binder.
Claims 1, 6, 8, and 9, including an airgel insulation composition layer formed of the airgel insulation composition of any one of claims, thin airgel sheet.
The thin film airgel sheet according to claim 10, wherein the airgel insulation composition layer has a thickness of 0.05mm or more and 1mm or less after drying.
The thin-film airgel sheet according to claim 10, wherein the airgel sheet further includes a fibrous layer or a thin film layer on one surface of the airgel insulating composition layer.

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