WO2014163403A1

WO2014163403A1 - Coating composition containing composite aerogel and method for manufacturing same

Info

Publication number: WO2014163403A1
Application number: PCT/KR2014/002859
Authority: WO
Inventors: 홍순오; 유영종; 이재환
Original assignee: 주식회사 관평기술
Priority date: 2013-04-02
Filing date: 2014-04-02
Publication date: 2014-10-09

Abstract

The present invention relates to a coating composition containing a composite aerogel and a method for manufacturing the same. The composite aerogel consists of a basic aerogel material uniformly integrated with an ultraviolet prevention material containing carbon so as to provide considerably improved thermal insulation due to the synergic effect of the interaction between the basic aerogel material and the ultraviolet prevention material compared to the conventional coating composition. Also, the basic material and the ultraviolet prevention material are integrated through the sol-gel process so as to simplify the additional procedure of combining the functional material and to make the combination strong and uniform, thus providing excellent thermal insulation and various functionalities.

Description

Paint composition containing composite airgel and method for producing same

The present invention relates to a heat insulating paint and a method for manufacturing the same, and more particularly to a coating composition containing a composite airgel and a method for producing the same.

Conventional insulating paints have been used in the form of a mixture of hollow ceramic powder mainly composed of SiO ₂ (silica) and Al ₂ O ₃ (alumina) in the paint (Korean Patent Laid-Open Publication No. 2004-22985 and Korean Laid-Open Patent) No. 2001-372).

This conventional insulating paint is not only difficult to evenly disperse the hollow ceramic powder in the paint, but when the paint containing the ceramic powder is left for a long time, there is a problem that the hollow ceramic powder and other fillers are separated into layers due to the weight difference. It is becoming. In addition, when applied in the form of paint, a problem arises that sufficient amount occurs during drying. For this reason, heat insulation property falls.

In addition, since the hollow ceramic materials do not provide sufficient thermal insulation effect, the thermal insulation properties of the paint are insignificant.

Meanwhile, Korean Unexamined Patent Publication No. 2007-117413 discloses a method of manufacturing an inorganic binder and adding heat (vermiculite powder), auxiliary solid (titanium oxide), dispersant, and flow control agent to the inorganic binder to impart heat insulation to the paint. have.

However, such a method has a problem in that the manufacturing method is difficult, requires a lot of time and cost, and is inferior in effectiveness due to its poor thermal insulation.

On the other hand, in order to further improve the thermal insulation of the paint, there has been disclosed a technique in which the airgel with excellent thermal insulation in the paint in the form of a powder, more specifically, the silica airgel or titanium dioxide airgel each included in the paint alone Alternatively, the silica airgel and the titanium dioxide airgel are mixed and included in the paint to improve the thermal insulation of the paint.

However, in the prior art including the airgel in the paint as described above, silica airgel has a relatively low density, titanium dioxide airgel has a relatively high density, there is a problem that the heat insulation performance is lowered due to the concentration on the upper or lower side of the paint. In addition, even when the above two materials are mixed and included in the paint, they are separated from each other in the drying process of the paint due to the difference in density, so that it is difficult to provide effective thermal insulation performance.

[Preceding technical literature]

[Patent Documents]

(Patent Document 1) Republic of Korea Patent Publication No. 10-2010-0085472 (published Jul. 29, 2010) 'Super insulating airgel-containing paint containing an airgel'

The present invention has been made in order to solve the conventional problems as described above, but to be made to include a composite airgel in the coating composition, the composite airgel, the infrared blocking material containing carbon in the base material that can be formed as an airgel uniformly It is an object of the present invention to provide a coating composition and a method for producing the composite aerogel, characterized in that to be formed in an integrally bonded structure, to provide a better heat insulating performance than in the prior art. .

Hereinafter, to solve the present invention to achieve the above object.

The coating composition containing the composite airgel according to the present invention comprises a resin liquid for coating formed of a liquid resin; A composite aerogel formed in a three-dimensional mesh structure forming a base material with an integral bonding structure in which an infrared ray blocking material is embedded, and added to the coating resin liquid in powder form; It is made, including, the infrared ray blocking material is carbon, or is characterized in that the carbon and titanium dioxide complex formed in a certain weight ratio.

In addition, the method for producing a coating composition containing a composite airgel according to the present invention, while adding a powdered infrared ray blocking material to the mixed solution (sol) mixed with water to the base material, while stirring, adding carbon as the infrared ray blocking material or Combining and adding carbon and titanium dioxide in a predetermined weight ratio, stirring, and then forming a composite aerogel by adding a catalyst to gel the catalyst; Powdering the composite airgel and adding the resultant to the coating resin solution.

The present invention having the configuration as described above can provide the following technical and economic effects.

First, in forming the airgel included in the coating composition according to the present invention, based on the airgel base material that provides the basic thermal insulation performance, to form a composite structure integrally combining the base material and the infrared ray blocking material to block the infrared wavelength By using carbon or carbon and titanium dioxide mixed at a predetermined weight ratio as the infrared ray blocking material, the thermal insulation performance is further improved compared to conventional paints due to the synergistic effect of the interaction between the integrally bonded airgel base material and the infrared ray blocking material. There is a technical effect that can provide.

Secondly, in uniformly combining the airgel base material and the infrared ray blocking material, the infrared ray blocking material is stirred in a powder state in a mixed solution (sol) mixed with the base material and water so as to be formed integrally in the process of gelation. By doing so, the additional coupling of the functional material is simple, but the coupling is uniform and robust, and there is a technical effect that can easily provide various functionalities as well as excellent thermal insulation performance.

Hereinafter will be described in more detail with respect to the present invention that can expect the above effects.

First, the coating composition according to the present invention, a resin liquid for coating formed of a liquid resin capable of exhibiting a predetermined color; A composite airgel added to the liquid paint liquid as a powder having a structure in which a base material and an infrared ray blocking material are uniformly formed; It is made, including.

The coating resin liquid is to be a basic material of the coating composition according to the present invention, and more specifically, a liquid acrylic resin, a silane resin, a siloxane resin, a phthalic acid resin, a vinyl chloride resin, an epoxy resin, It is preferable to form based on either urethane resin or amino alkyd resin.

The composite airgel is added to the resin solution for coating formed as described above, and the composite airgel is preferably added in a powder form and stirred, wherein the composite airgel blocks the base material and the infrared wavelength which can be formed in the airgel form. Infrared shielding material is formed in a structure in which the combined body. It is preferable to mix the said coating resin liquid and the composite airgel in 40-95 weight% of said coating resin liquids at the ratio of 5 to 60 weight% of a composite airgel.

More specifically with respect to the coupling structure of the base material and the infrared ray blocking material constituting the composite airgel, the base material is formed in a three-dimensional network structure, the infrared ray blocking material is a nano to several tens of micrometers smaller than the base material In addition, the structure is inherently coupled to the three-dimensional network forming the base material.

The base material is preferably formed using any one of silica, alumina, polyimide, silica-titania, silica-carbon, vanadia, zirconia, and acetate cellulose, which can be formed in an airgel form.

A mixed solution (sol) in which water is mixed with the base material, preferably made by mixing 10 to 50% by weight of the base material and 50 to 90% by weight of water.

The infrared ray blocking material may be used alone or in a mixture of carbon and other infrared ray blocking materials at a predetermined ratio. Carbon absorbs and scatters infrared rays to block heat by radiant heat, thereby improving thermal insulation performance of the composite aerogel. As carbon, graphite, carbon black, activated carbon, or the like may be used. The infrared blocking material may be used to form a size of nano to several tens of micrometers. The length of the carbon used as the infrared blocking material is preferably about 0.1 to 50㎛.

Preferably, titanium dioxide may be used as another infrared ray blocking material. Titanium dioxide has the effect of blocking infrared rays like carbon, and thus, by forming a structure in which two or more infrared ray blocking materials are uniformly integrally bonded to the base material, the composite airgel can exhibit more excellent thermal insulation performance by providing density. . Titanium dioxide is preferably used in the form of a powder having a diameter of 300 to 500 nm. The blending ratio of titanium dioxide to 1 part by weight of carbon is preferably about 0.1 to 2 parts by weight, particularly preferably about 0.5 to 1 part by weight.

As described above, the base material and the infrared ray blocking material, which are bonded at the nano to tens of microscopic particle levels, are not broken and maintained even when the powder is pulverized in the form of powder. It is done.

In addition, even if it is not an infrared blocking material, any functional material for thermal insulation may be additionally formed in the size of nano to several tens of micrometers to be combined with the base material in the same way.

The total amount of the infrared ray blocking material including the other insulating material is preferably about 0.5 to 10% by weight based on the total weight of the composite airgel finally formed.

When most of the base material is formed of an airgel, the density is 0.09 to 0.025 g / cm 3 (based on silica), and most infrared ray blocking materials have a density of 4.1 g / cm 3 (based on titanium dioxide), so that they are simply mixed and included in the coating resin. In this case, the base material has a problem in that the upper portion of the coating resin solution, the infrared blocking material sinks in the lower portion of the coating resin solution, but due to the bonding structure according to the present invention, the composite airgel is formed with an average density of both materials do.

Due to the averaging of the bonding structure and density of the two materials in the dimension of nano to several tens of micrometers as described above, both materials are not separated from each other even during the drying process of the paint, and are kept in an integral structure, without being biased to a specific part of the paint. It is evenly distributed over the entire part, so that it can effectively block external thermal energy and infrared wavelengths.

In addition, by adjusting the viscosity in the coating resin liquid containing the composite airgel as described above, it is also possible to more uniformly distribute the composite airgel formed at the average density, the composition for controlling the viscosity is dry silica Preference is given to using fumed silica. At this time, the dry silica is also preferably formed into a nano-sized powder form and stirred in the resin solution for coating, the amount of the input is added in the minimum amount that can be maintained evenly distributed in the composite airgel during the drying process of the paint It is desirable to. Particularly preferably, the dry silica is included in the range of 0.01 to 3% by weight in the total weight of the resin solution for paint containing the composite airgel.

In addition, the coating composition of the present invention may preferably further comprise a binder. The binder may be used in combination with an organic binder or an inorganic binder or both. Since the composite airgel has a low density and hydrophobicity, it is preferable to form a coating composition by adding an organic binder and / or an inorganic binder to the coating resin liquid and the composite airgel.

Especially preferably, an organic binder and an inorganic binder can be mixed and used in fixed ratio. This is because the organic binder alone is difficult to increase the content of the airgel in the composition, the inorganic binder alone is difficult to paint, and the inorganic binder itself is not preferable when the amount of use is high due to high thermal conductivity. The most preferable range is to use by mixing 30 to 90% by weight of the organic binder and 10 to 70% by weight of the inorganic binder, it is possible to paint in this range, excellent heat insulation and good flame retardancy.

Since the thermal conductivity of the organic binder and the inorganic binder increases significantly as the content is increased after the coating composition is formed, it is preferable to add the organic binder and the inorganic binder in a minimum ratio to the extent that the coating composition is made, and the composite coating includes the entire air composition. It is preferable to add in the ratio of 5-50 weight% with respect to weight.

The organic binder is to increase paint adhesion and fluidity, it is preferable to use a binder such as polyurethane, acrylate copolymer, inorganic binder is to increase the adhesion of the paint and impart flame retardancy, potassium silicate, zinc phosphate Preference is given to using binders such as talc, magnesium oxide and the like.

In addition, it is preferable to use polyacrylamide or polynaphthalenesulfonate as the crosslinking binder in the organic binder, and the crosslinking binder increases the viscosity when dispersed in water, thereby increasing the mixing and bonding of the organic binder and the inorganic binder and increasing the interfacial tension. Lower it significantly to allow the airgel to disperse easily

In the inorganic binder, the water-soluble inorganic binder is preferably a binder such as micro cement, hemihydrate gypsum, silica fume, fumed silica, lime, calcium sulfoaluminate, and the water-soluble inorganic binder is hydrated with silica. The pozzolanic reaction enhances the long-term strength of the coating, improves water tightness and durability, as well as tightly anchors low-density aerogels.

In addition, the coating composition of the present invention may further include a silicone antifoaming agent.

In addition, the coating composition of the present invention may further include a fiber so as to give a certain strength or more when dried. The fibers preferably use fibers of 0.1 to 4 mm long. As the fiber, at least one selected from polypropylene fiber, polyethylene fiber, silica fiber, alumina fiber, carbon fiber and glass fiber is used.

Next, the manufacturing method of the coating composition formed with the above structure will be explained in detail.

First, the method for preparing the coating composition is to form a composite airgel by adding and stirring a powdered infrared ray blocking material to a mixed solution (sol) in which water is mixed with a base material, and then gelling by adding a catalyst. Steps; Powdering the composite airgel and adding the resultant to the coating resin solution.

The mixed solution is formed by mixing the base material and water as described above, the base material is preferably blended 10 to 50% by weight in a proportion of 50 to 90% by weight of water.

After forming the mixed solution as described above, the infrared blocking material is added and stirred, it is preferable that the infrared blocking material is formed in the form of powder of nano to several tens of micrometers size to the mixed solution and stirred. The amount of the infrared shielding substance to the mixed solution is preferably added at a ratio of 0.0.5 to 2 parts by weight, more preferably 0.1 to 1 part by weight, particularly preferably 0.2 to 0.6 parts by weight with respect to 100 parts by weight of the mixed solution. It is desirable to.

In addition, the infrared blocking material is preferably used by using carbon or by combining carbon and titanium dioxide at a predetermined ratio, wherein the titanium dioxide is preferably formed to have a size of 300 to 500 nm and carbon of 0.1 to 50 μm. Do.

When the infrared blocking material in the form of nano to several tens of micrometers powder is added to the gel by adding a catalyst to the stirred mixture, a composite airgel is formed. An infrared ray blocking material of nano to several tens of micrometers is built into the dimensional network to be integrally coupled.

Accordingly, the base material and the infrared ray blocking material constituting the composite airgel are not separated from each other even if they are pulverized and formed into a powder, and are not separated even if included in the paint resin solution, so that the combined airgel can be kept intact.

In addition, with respect to the process of forming a composite aerogel by gelling by adding a catalyst to the mixed solution in which the infrared blocking material is stirred, the patent application No. 10-2014-0008687 filed by the applicant of the present invention, accordingly Detailed description of the process will be omitted.

Hereinafter will be described with respect to specific embodiments of the present invention.

Composite Airgel Manufacturing

Silica was used as a base material for forming the airgel, and carbon black was used as the infrared ray blocking material.

The mixed liquid is formed by mixing silica and water. More specifically, the mixed liquid is formed by mixing 39% by weight of silica (= water glass) and 61% by weight of water.

Based on 450 g of the mixed solution as described above, 2.5 g of carbon black in powder form was added and stirred. At this time, the carbon black used was in the form of a powder, the average length was about 10㎛.

As described above, 35 grams of sulfuric acid solution diluted to a concentration of 28% by volume was added to the mixed solution to which carbon black was added as a catalyst for gelation, and then gelled after a predetermined time. At this time, the silica, water, carbon black, sulfuric acid solution is stirred in a line-mixer (line-mixer), in this embodiment was formed in a hydro-gel state after 30 seconds. The hydro-gel is more robustly formed through the aging process, and the hydro-gel was immersed for 5 hours in sulfuric acid solution diluted to a concentration of 2% by volume.

Hydro-gel after the aging process as described above is subjected to an impurity washing process to remove the sodium ions as impurities using water, wherein the water is prepared 10 liters, soaking the hydro-gel for 10 hours, sodium ions 10 liters of water are replaced every 2 hours.

The hydro-gel from which impurities are removed through the impurity washing process is subjected to surface modification and solvent replacement. In this embodiment, hexanemethyldisilazane (HMDS: Hexamethyldisilazane) is used as an organosilane compound in relation to the surface modification. N-hexane was used as the nonpolar organic solvent in relation to the solvent replacement.

More specifically, the hexane methyl disilazane is prepared 1 liter, n-hexane is 10 liters, the above two solutions (HMDS, n-hexane) to maintain the 65 degrees Celsius so that the impurity was washed in a container together Soak the hydrogel for 8 hours to allow surface modification and solvent replacement.

When the surface modification and solvent replacement as described above, the hydro-gel is aerogelized, and by drying it for 5 hours at 100 degrees Celsius in the dryer, it is only possible to form a composite airgel.

Composite Airgel Manufacturing

Silica was used as the base material for forming the airgel, and carbon black and titanium dioxide were used as the infrared ray blocking material.

Into the same mixed solution (silica 39% by weight + 61% by weight of water) in the same manner as in Example 1-1, carbon black and titanium dioxide were added and stirred at 1.25 grams each as an infrared ray blocking material. 2.5 grams of carbon black in powder form was added and stirred.

At this time, the titanium dioxide used was in the form of a spherical powder, the average diameter of about 405nm, carbon black was in the form of a powder, the average length was about 10㎛.

The rest was carried out in the same manner as in Example 1-1, to obtain a composite airgel.

Paint Composition Preparation

The composite composition was prepared in Example 1-1 to prepare a coating composition having the composition shown in Table 1 below.

Table 1

number	designation	Composition ratio (weight ratio)
One	Silica-Carbon Aerogels	13.53
2	Microcement	3.60
3	Half gypsum	1.80
4	Silica fume	0.54
5	Fumed silica	0.13
6	lime	0.94
7	Calcium sulfoaluminate	0.31
8	Polyacrylic acid ester	4.58
9	Zinc phosphate	0.23
10	Talc	1.08
11	Potassium silicate	0.01
12	Magnesium oxide	0.06
13	Boric acid	0.23
14	Titanium dioxide	0.23
15	Silicone antifoam	0.09
16	Fiber (glass fiber, 2 mm)	0.01
17	Polyacrylamide	0.27
18	Polynaphthalenesulfonate	0.33
19	water	69.33
20	Polyurethane	2.70
		100

The obtained coating composition of the present invention was prepared in the form of a flat plate having a width of 25 cm, a length of 25 cm, and a thickness of 5 mm, and then completely dried, and then tested for thermal conductivity. As a result of the test, the thermal conductivity was found to be 35 mW / m.K.

Paint Composition Preparation

Using the composite airgel prepared in Example 1-2 was made a coating composition with the composition shown in Table 2 below.

TABLE 2

number	designation	Composition ratio (weight ratio)
One	Silica-Carbon-Titanium Dioxide Airgel	13.53
2	Microcement	3.60
3	Half gypsum	1.80
4	Silica fume	0.54
5	Fumed silica	0.13
6	lime	0.94
7	Calcium sulfoaluminate	0.31
8	Polyacrylic acid ester	4.58
9	Zinc phosphate	0.23
10	Talc	1.08
11	Potassium Silicate	0.01
12	Magnesium oxide	0.06
13	Boric acid	0.23
14	Titanium dioxide	0.23
15	Silicone antifoam	0.09
16	Fiber (glass fiber, 2 mm)	0.01
17	Polyacrylamide	0.27
18	Polynaphthalenesulfonate	0.33
19	water	69.33
20	Polyurethane	2.70
		100

The obtained coating composition of the present invention was prepared in the form of a flat plate having a width of 25 cm, a length of 25 cm, and a thickness of 5 mm, and then completely dried, and then tested for thermal conductivity. As a result of the test, the thermal conductivity was found to be 34.2 mW / m.K.

Comparative Example 1

In order to confirm the effect of the composite airgel prepared according to the present invention on the thermal conductivity results, a coating composition of the composition shown in Table 3 below was made as a control for comparison with Example 2-1. A coating composition was prepared in the same manner as in Example 2-1, except that silica airgel was used instead of the composite airgel obtained in Example 1-1.

TABLE 3

number	designation	Composition ratio (weight ratio)
One	Silica airgel	13.53
2	Microcement	3.60
3	Half gypsum	1.80
4	Silica fume	0.54
5	Fumed silica	0.13
6	lime	0.94
7	Calcium sulfoaluminate	0.31
8	Polyacrylic acid ester	4.58
9	Zinc phosphate	0.23
10	Talc	1.08
11	Potassium Silicate	0.01
12	Magnesium oxide	0.06
13	Boric acid	0.23
14	Titanium dioxide	0.23
15	Silicone antifoam	0.09
16	Fiber (glass fiber, 2 mm)	0.01
17	Polyacrylamide	0.27
18	Polynaphthalenesulfonate	0.33
19	water	69.33
20	Polyurethane	2.70
		100

The obtained coating composition was prepared in the form of a flat plate having a width of 25 cm, a length of 25 cm, and a thickness of 5 mm, and then completely dried, and then tested for thermal conductivity. As a result of the test, the thermal conductivity was 39.44 mW / m.K.

The coating composition containing the composite airgel of the present invention can be seen that the thermal conductivity is significantly improved than when using a silica airgel.

Comparative Example 2

The thermal conductivity of the coating composition using various insulating materials was tested, and the results were compared with the thermal conductivity of the coating composition according to the present invention.

First, the thermal conductivity was tested by using a thermal insulation tex (manufactured by Samwha), Korund, and Nansulfate, which was commonly used as a thermal insulation paint. The thermal conductivity of each thermal insulation paint was unified to 25 cm * 25 cm * 4 mm and tested. .

The thermal insulation was measured as a thermal conductivity of 75.59mW / m.K, Korund was measured 53.74mW / m.K, non-sulfate was measured to 84mW / m.K. Insulation paints are commercially available as described above was significantly higher thermal conductivity (that is, the thermal insulation performance was significantly lower) than the coating composition (Examples 2-1, 2-2) of the present invention.

Although the present invention has been described with reference to the above embodiments, it can of course be changed and implemented within the scope not departing from the technical idea of the present invention.

Claims

Paint liquid for coating formed of liquid resin; A composite aerogel formed in a three-dimensional mesh structure forming a base material with an integral bonding structure in which an infrared ray blocking material is embedded, and added to the coating resin liquid in powder form; It comprises, but the infrared blocking material is carbon, or carbon and titanium dioxide, characterized in that the composite formed by a certain weight ratio, a coating composition containing a composite airgel.
The method of claim 1,

The base material is formed using any one of silica, alumina, polyimide, silica-titania, silica-carbon, vanadia, zirconia, acetate cellulose, which can be formed in an airgel form, a composite airgel-containing paint Composition.
The method of claim 1,

The carbon is a coating composition containing a composite airgel, characterized in that any one of graphite, carbon black, activated carbon.
The method of claim 1,

The infrared blocking material is in the composite airgel Paint composition comprising a composite airgel, characterized in that contained in the range of 0.5 to 10% by weight.
The method of claim 1,

The coating resin solution is formed of any one selected from acrylic resins, silane resins, siloxane resins, phthalic acid resins, vinyl chloride resins, epoxy resins, urethane resins, amino alkyd resins, paint composition comprising a composite airgel.
The method of claim 1,

A coating composition comprising a composite airgel, further comprising at least one binder selected from an organic binder and an inorganic binder.
The method of claim 6,

The binder included is characterized in that it is blended with 30 to 90% by weight of the organic binder and 10 to 70% by weight of the inorganic binder, the coating composition containing a composite airgel.
The method according to claim 6 or 7,

The organic binder is at least one selected from polyurethane, acrylate copolymer, polyacrylamide, polynaphthalenesulfonate, composite airgel coating composition comprising a.
The method according to claim 6 or 7,

The inorganic binder, micro cement, hemihydrate gypsum, silica fume, fumed silica, lime, calcium sulfoaluminate, silicate, silica, zinc phosphate, talc, magnesium oxide, characterized in that the paint containing a composite aerogel Composition.
The method of claim 1,

Fumed silica formed in the form of nano-sized powder; Silicone antifoams; A coating composition comprising a composite airgel, further comprising at least one additive selected from 0.1 to 4 mm long fibers.
The method of claim 10,

The fiber is at least one selected from polypropylene fiber, polyethylene fiber, silica fiber, alumina fiber, carbon fiber, glass fiber, composite airgel containing a coating composition.
To the mixed solution (sol) in which water is mixed with the base material, an infrared ray blocking material in the form of powder is added and stirred, and carbon is added as the infrared ray blocking material or carbon and titanium dioxide are mixed and added at a predetermined weight ratio, followed by stirring. Adding a catalyst to gel to form a composite airgel;

Powdered composite airgel and adding to the resin solution for coating, comprising the composite airgel, a method for producing a coating composition comprising a.
The method of claim 12,

The base material, which can be formed in the form of an airgel, characterized in that any one of silica, alumina, polyimide, silica-titania, silica-carbon, vanadia, zirconia, acetate cellulose, composite airgel containing a coating composition of Manufacturing method.
The method of claim 12,

The mixed solution, characterized in that the mixture is made in a ratio of 10 to 50% by weight of the base material and 50 to 90% by weight of water, the method for producing a coating composition containing a composite airgel.
The method of claim 12,

The carbon is characterized in that the powder is formed in the form of 0.1 to 50㎛ size, method of manufacturing a coating composition comprising a composite airgel.
The method of claim 15,

The carbon is a method for producing a coating composition comprising a composite airgel, characterized in that any one of graphite, carbon black, activated carbon.
The method according to any one of claims 12 to 16,

Method for producing a coating composition comprising a composite airgel, characterized in that for adding the infrared blocking material in a ratio of 0.05 to 2 parts by weight based on 100 parts by weight of the mixed solution.
The method of claim 12,

The titanium dioxide is characterized in that the powder is formed in the form of a 300 to 500nm size, a method for producing a coating composition comprising a composite airgel.
The method of claim 12,

Method for producing a coating composition containing a composite airgel, characterized in that for mixing at a ratio of 40 to 95% by weight of the resin solution for paint and 5 to 60% by weight of a composite airgel.
The method of claim 12,

Adding at least one binder selected from an organic binder and an inorganic binder to the coating composition in a weight equivalent to 5 to 50% by weight relative to the total weight of the coating composition containing the composite airgel, comprising a composite airgel Method for producing a coating composition.