KR20170049466A - Solar heat barrier coating solution composition - Google Patents

Abstract

The present invention relates to a solar heat blocking coating solution composition for blocking solar heat. The solar heat blocking coating solution composition comprises a nano-metal oxide including cesium tungsten oxide (CTO), antimony tin oxide (ATO), and indium tin oxide (ITO). According to the solar heat blocking coating solution composition of the present invention, the content of the nano-metal oxide is 9.8 to 34.5 wt%, and is preferably 30 to 34.5 wt%. The content of the CTO is 4 to 15 wt%, is preferably 6 to 11 wt%, and is more preferably 8 to 10 wt%. According to the solar heat blocking coating solution composition of the present invention, the thickness of a coating solution is not thick, and transparency of glass is maintained. Also, excellent visible ray penetration rates, UV ray blocking rates, hardness, and adhesiveness are ensured. According to the present invention, solar heat blocking coating glass having a solar heat blocking function can be provided by directly coating the composition on glass, not by making the composition in a conventional film shape.

Description

SOLAR HEAT BARRIER COATING SOLUTION COMPOSITION [0001]

The present invention relates to a coating liquid composition, and more particularly, to a solar thermal barrier coating composition for solar heat shielding.

In general, the wavelength of sunlight can be divided into gamma ray, X-ray, ultraviolet ray, visible ray, infrared ray, microwave, and radio wave. Of these, the wavelength of visual sunlight is the visible ray region. The wavelength is longer than the visible light region. In addition, since ordinary glass reflects only a part of the infrared ray part, in summer, radiant heat generated from the outdoor solar heat enters the room to increase the room temperature, and the efficiency of the air conditioner is lowered and energy is wasted. In connection with the above-mentioned reality, the glass coated with the preferred solar barrier coating liquid composition should have an excellent heat shielding effect that prevents external solar heat from entering the room in summer.

Specifically, conventionally, a heat-reflecting glass is used to impart an excellent heat-shielding effect to glass, but its visible light transmittance is 40%, which means that visibility is poor. Another case for improving the heat shielding effect is a case where a film is adhered to the film. In this case, the adhesive performance is lowered when the adhesive is used up, and the adhesive remaining on the film removal makes it difficult to re- It is difficult to control the transmission and reflectance of light.

In order to improve the heat insulating effect of glass, low-e glass using a sputter coating method has been marketed (Patent No. 10-1544070). However, in order to prevent the coating from being oxidized, Layered glass plate, and the gap between the glass plates must be filled with an inert gas, so that the manufacturing method is difficult, and an edge stripping treatment equipment is required in the production of the double-layered glass, which makes it difficult to manufacture and handle , And the manufacturing cost is high. In addition, the development of low-e glass products having both heat insulation, shielding performance and hardness is insufficient.

Therefore, there is a need for continuous research and development on a solar barrier coating composition having high visibility, high visibility, low infrared ray transmittance, excellent solar heat shielding effect, and excellent physical and chemical properties such as adhesiveness.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention The present invention has been made in order to solve the problems caused by the conventional solar blocking coating liquid composition and the technology using the same, which has problems in that the visible light transmittance is not high or the infrared transmittance is not low, It is an object of the present invention to provide a solar barrier coating liquid composition which can solve the problem that the duration of solar shutdown is not long due to poor physical and chemical properties such as adhesion, rework is required, or handling is difficult.

In order to solve the above problems, the inventors of the present invention have found that the content of the nano-metal oxide in the solar barrier coating liquid composition is 9.8 to 34.5 wt%, preferably 30 to 34.5 wt%, and the content of cesium tungsten oxide CTO) in an amount of 4 to 15% by weight, preferably 6 to 11% by weight, more preferably 8 to 10% by weight.

The glass using the solar barrier coating liquid composition according to the present invention having the above-described structure exhibits a visible light transmittance of 70% or more as measured at 520 nm, thereby reducing the illumination load. In addition, the glass using the solar barrier coating liquid composition according to the present invention has an infrared transmittance measured at 1200 nm of 38% or less, preferably 30% or less, effectively blocking the near infrared region occupying most of the solar radiation energy Reduce air conditioning costs by reducing the amount of sunlight entering the room in summer.

Further, by solving the above problems, the solar heat shielding coating solution composition according to the present invention maintains the transparency of the glass, has excellent visible light transmittance, infrared ray blocking rate, hardness and adhesion, It is possible to provide a solar barrier coating glass which can be directly coated on a glass rather than a widely used film to perform a solar barrier function.

1 is a graph of transmittance per wavelength of sunlight according to the content of cesium tungsten oxide (CTO) (the horizontal axis is the wavelength (nm) and the vertical axis is the transmittance (%)).
2 is a graph of transmittance per wavelength of sunlight according to the content of the nano-metal oxide (the horizontal axis is the wavelength (nm) and the vertical axis is the transmittance (%)).
3 is a graph of transmittance of each wavelength of sunlight according to the particle size of the nano-metal oxide (the horizontal axis is the wavelength (nm) and the vertical axis is the transmittance (%)).

Various embodiments and / or aspects are now described with reference to the drawings. In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more aspects. However, it will also be appreciated by those of ordinary skill in the art that such aspect (s) may be practiced without these specific details. The following description and the annexed drawings set forth in detail certain illustrative aspects of one or more aspects. It is to be understood, however, that such aspects are illustrative and that some of the various ways of practicing various aspects of the principles of various aspects may be utilized, and that the description set forth is intended to include all such aspects and their equivalents.

In addition, the term "or" is intended to mean " exclusive or " That is, it is intended to mean one of the natural inclusive substitutions "X uses A or B ", unless otherwise specified or unclear in context. That is, X uses A; X uses B; Or when X uses both A and B, "X uses A or B" can be applied to either of these cases. It should also be understood that the term "and / or" as used herein refers to and includes all possible combinations of one or more of the listed related items.

It is also to be understood that the term " comprises "and / or" comprising " means that the feature and / or component is present, but does not exclude the presence or addition of one or more other features, components and / It should be understood that it does not. Also, unless the context clearly dictates otherwise or to the contrary, the singular forms in this specification and claims should generally be construed to mean "one or more. &Quot;

The solar barrier coating liquid composition according to one aspect of the present invention is characterized by comprising a nano-metal oxide including cesium tungsten oxide (CTO), antimony tin oxide (ATO), and indium tin oxide (ITO). The heat shielding coating liquid composition according to the present invention maintains the transparency of the glass, has excellent visible light transmittance, infrared ray blocking rate, hardness, adhesion, and the like, The present invention provides an effect of providing a solar barrier coating glass that performs a solar shutdown function by directly coating it on a glass substrate.

Hereinafter, the present invention will be described in detail.

The solar barrier coating liquid composition according to the present invention includes a nano metal oxide including cesium tungsten oxide (CTO), antimony tin oxide (ATO), and indium tin oxide (ITO), and the content of the nano metal oxide is 9.8 to 34.5 wt% %, Preferably 30 to 34.5% by weight, and the content of cesium tungsten oxide (CTO) is 4 to 15% by weight, preferably 6 to 11% by weight, more preferably 8 to 10% by weight.

Another aspect of the present invention is that the visible light transmittance measured at 520 nm is 70% or more.

Another aspect of the present invention is that the infrared transmittance measured at 1200 nm is 13% or less.

According to an aspect of the present invention, the particle size of the nano-metal oxide is 20 to 200 nm.

In the present invention, the nano-metal oxide, which is the main component of the nano-metal oxide ink, is composed of a nano-metal oxide having the property of blocking light in the infrared region of sunlight. (CTO), antimony tin oxide (ATO), and indium tin oxide (ITO) are used in the present invention since all of the general nano metal oxides can be used. It is preferable to use an oxide.

The content of the nano-metal oxide is 9.8 to 34.5% by weight, preferably 30 to 34.5% by weight, and most preferably 28.9% by weight. When the nano-metal oxide is contained in an amount of less than 9.8 wt%, the infrared ray shielding effect of the nano-metal oxide is low and the thermal barrier performance is very small. When the content is more than 34.5 wt%, it takes a long time to control the particle size of the nano- , It is difficult to appropriately disperse the nano-metal oxide. Therefore, a range within the above-mentioned content ratio of 9.8 to 34.5 wt% is preferable.

The content of cesium tungsten oxide (CTO) in the nano-metal oxide is preferably 4 to 15 wt%, more preferably 6 to 11 wt%, and still more preferably 8 to 10 wt%. The cesium tungsten oxide The oxide (CTO) has a property that the infrared ray shielding effect is high when coated on glass, and the visible light transmittance can be maintained at a high level of 70% or more, and infrared rays can be effectively shielded from the near infrared ray range close to the visible ray range to the wide wavelength range .

The visibility is secured when the visible light transmittance measured at 520 nm is 70% or higher. Therefore, the solar barrier coating glass prepared using the solar thermal barrier coating composition according to the present invention has a visible light transmittance of at least 70% measured at 520 nm desirable. If the visible light transmittance of the solar barrier coating glass is less than 70%, the visibility may not be secured, which may increase the illumination load and lower the transparency.

In addition, when the infrared transmittance measured at 1200 nm is 38% or less, the thermal barrier performance is excellent, and it is most effective when the infrared transmittance is 30% or less.

The particle size of the nano metal oxide is preferably 20 to 200 nm when the solar barrier coating liquid composition containing the nano-metal oxide is coated on the glass. When the particle size of the nano-metal oxide is less than 20 nm, the specific surface area becomes large and the dispersing power is lowered and the material cost is increased. When the particle size exceeds 200 nm, the haze due to the nano- %, And the coating surface becomes uneven. Therefore, it is preferable to use the nano-metal oxide within the above range.

The solar barrier coating liquid composition according to the present invention may contain a dispersant to effectively disperse the nano-metal oxide. The kind of the dispersant that can be used is not limited, but 2-2-2-methoxyethoxyethoxyacetic acid ( Methoxyethoxy ethoxy acetic acid, 5-methoxy pentyloxy acetic acid, 3,6,9-trioxadecane acid, Examples of the inorganic filler include palmitic acid, stearic acid, propionic acid, sodium polyacrylate, ammonium polyacrylate, cetyltrimethyl ammonium bromide (CTAB) , Polyacrylic sodium salt, dodecyl benzene sulfonate, or sodium dodecyl sulfate (SDS) may be preferably used. The dispersant of the present invention having the above-described structure has affinity to the surface of the nano-metal oxide, and has a functional group capable of adsorbing the nano-metal oxide on the surface of the dispersant and being effectively dispersed in the solvent, (-R) or alkoxy (-OR) in a chain form that allows the self-structure to be stabilized in a solvent, and thus exhibits excellent dispersibility and stability as compared with general dispersants do.

The solvent used in the preparation of the nano-metal oxide ink of the solar blocking coating liquid composition according to the present invention is preferably selected from the group consisting of water, methanol, butyl glycol, and the like in consideration of the dispersibility and stability, toxicity, viscosity, chemical stability, A compound having a structure of R1-O-R2 or R1-CO-R2 such as isopropyl glycol, aryl glycol, ethyl acetate, dibutyl ether, methyl ethyl ketone or dimethylformamide can be used. When the number of carbon atoms of the substituents (R 1, R 2) increases, the molecular volume of the solvent increases and the number of electrons increases. Asymmetry of the distribution of electrons in the molecule increases and polarization occurs, Therefore, the above-mentioned dispersing force induces electrostatic induction phenomenon of the nano-metal oxide and the ink solvent molecules, so that a total intermolecular aggregation phenomenon occurs. This phenomenon causes a problem that the nano metal oxide particles can not be effectively dispersed in the nano-metal oxide ink do. Therefore, substituents R1 and R2 of the solvent are each hydrogen, an ether group, an ester group, an amide group, etc. substituted with an n-alkyl group, an iso-alkyl group, a heteroaryl group, an aryl group or an alkyl group having 1 to 10 carbon atoms, It is preferable to use the formed substituent as the ink solvent of the present invention because the volume of the substituent and the number of electrons are appropriate so that the nano metal oxide particles do not cause agglomeration due to the dispersing power of molecules constituting the ink solvent.

In addition, by using a mechanical method such as bead milling, ball milling, and ultrasonic milling in order to disperse the nano metal oxide of the nano metal oxide ink well in the solvent, it is possible to prevent agglomeration of the dye due to the attraction between the nano metal oxide particles, .

Further, the solar barrier coating liquid composition according to the present invention may contain a water-dispersed polyurethane (PUD) binder liquid. The water-dispersed polyurethane (PUD) binder liquid functions as an ink binder and is a component for increasing ink viscosity in accordance with specifications of a product. The water-dispersed polyurethane (PUD) binder solution may include a solvent for dispersing the components. Such a solvent may include a hydrocarbon-based organic solvent such as toluene, xylene, cyclohexanone, or an aqueous solvent such as water. In addition, the aqueous dispersion polyurethane (PUD) binder liquid may contain a surfactant to improve dispersibility. Such surfactants include polyvinyl alcohol, polyvinyl pyrrolidone, methyl cellulose (MC), ethyl cellulose ( EC) and styrene-maleic anhydride copolymers; Anionic surfactants such as sodium oleate and sodium lauryl sulfate; Nonionic surfactants such as polyoxyethylene alkyl ethers, polyoxyethylene alkyl phenyl ethers, polyoxyethylene fatty acid esters, sorbitan fatty acid esters, polyoxy sorbitan fatty acid esters, polyoxyethylene alkyl amines and glycerin fatty acid esters; And cationic surfactants including quaternary ammonium salts such as laurylamine acetate, alkylamine salts and lauryltrimethylammonium chloride, and phosphates such as calcium phosphate, magnesium phosphate, aluminum phosphate and zinc phosphate; Pyrophosphoric acid salts such as calcium pyrophosphoric acid, magnesium pyrophosphoric acid, aluminum pyrophosphoric acid and zinc pyrophosphoric acid; Or an inorganic dispersant such as calcium carbonate, magnesium carbonate, calcium hydroxide, magnesium hydroxide, aluminum hydroxide, calcium metasilicate, calcium lactate, barium sulfate, colloidal silica and fumed silica.

<Examples>

The following are examples and comparative examples of the solar thermal barrier coating composition according to the present invention, and the specific composition of each composition is shown in Table 1. These embodiments are only for illustrating the present invention, and the scope of protection of the present invention is not limited by these embodiments.

1. Solar barrier coating liquid composition and production of solar barrier coating glass using the same

[Example 1]

(1) A solar barrier coating liquid composition having the composition of Example 1 in the following Table 1 is prepared.

(2) The above-prepared solar barrier coating composition is injected into a sprayer, and then coated on one surface of a clear glass having a thickness of 6 mm using a spin coating method.

(3) The glass coated with the solar barrier coating liquid composition was dried at room temperature for 30 minutes or in an oven maintained at 80 ° C for 10 minutes to prepare a solar barrier coating glass.

[Example 2]

(1) A solar barrier coating liquid composition having the composition of Example 2 in Table 1 below is prepared.

(2) The solar barrier coating liquid composition is coated on the glass surface in the same manner as in (2) of Example 1.

(3) The solar barrier coating liquid coated on the glass surface is dried in the same manner as in Example 1, step 3, to produce a solar barrier coating glass.

[Example 3]

(1) A solar barrier coating liquid composition having the composition of Example 3 in the following Table 1 is prepared.

(2) The solar barrier coating liquid composition is coated on the glass surface in the same manner as in (2) of Example 1.

(3) The solar barrier coating liquid coated on the glass surface is dried in the same manner as in Example 1, step 3, to produce a solar barrier coating glass.

[Example 4]

(1) A solar blocking coating liquid composition having the composition of Example 4 in the following Table 1 is prepared.

(2) The solar barrier coating liquid composition is coated on the glass surface in the same manner as in (2) of Example 1.

(3) The solar barrier coating liquid coated on the glass surface is dried in the same manner as in Example 1, step 3, to produce a solar barrier coating glass.

[Comparative Example 1]

(1) A solar barrier coating liquid composition having the composition of Comparative Example 1 in the following Table 1 is prepared.

(2) The solar barrier coating liquid composition is coated on the glass surface in the same manner as in (2) of Example 1.

(3) The solar barrier coating liquid coated on the glass surface is dried in the same manner as in Example 1, step 3, to produce a solar barrier coating glass.

[Comparative Example 2]

(1) A solar barrier coating liquid composition having a composition of Comparative Example 2 in Table 1 is prepared.

(2) The solar barrier coating liquid composition is coated on the glass surface in the same manner as in (2) of Example 1.

(3) The solar barrier coating liquid coated on the glass surface is dried in the same manner as in Example 1, step 3, to produce a solar barrier coating glass.

[Comparative Example 3]

(1) A solar barrier coating liquid composition having a composition of Comparative Example 3 in Table 1 is prepared.

(2) The solar barrier coating liquid composition is coated on the glass surface in the same manner as in (2) of Example 1.

(3) The solar barrier coating liquid coated on the glass surface is dried in the same manner as in Example 1, step 3, to produce a solar barrier coating glass.

[Comparative Example 4]

Attach the commercially available short film (M Company) to one side of a clean 6 mm thick transparent glass.

[Comparative Example 5]

A commercial short film (T company) is placed on one side of a clean 6 mm thick transparent glass.

2. Property evaluation

[Assessment Methods]

The glasses of the above Examples and Comparative Examples were evaluated by the following physical property evaluation methods.

(1) Visible light transmittance (VIS.T%) / Infrared transmittance (IR.T%)

The visible light transmittance at 520 nm and the infrared transmittance at 1200 nm were measured using a UV / VIS / NIR spectrometer (Cary 5000).

(2) Hardness

MITSUBISHI Using a pencil, a load of 1 kg, an angle of 45 degrees, a velocity of 50 mm / min, and a travel distance of 100 mm.

(3) Shading coefficient (SC) and solar heat gain coefficient (SHGC)

Calculated using a Cary-500 spectrophotometer and a Nicolet 5700 with a Window 5.2 program developed on the basis of ISO 9050 at the US LBNL laboratory. The shielding factor (SC) is the ratio of the degree of radiant energy blocking, and the value when the light passes through is 1, and the closer to 0, the more the solar energy is shielded. The solar heat gain factor (SHGC) represents the percentage of solar energy entering the room through the window of incident solar energy.

(4) Adhesiveness

The coating film was cut horizontally and vertically at intervals of 1 mm to make 100 chambers. The coated glass was put in a boiling water of 100 ° C. for 30 minutes, and the cellophane tape was evenly adhered to the cut surface and removed instantly. .

 [Evaluation results]

As can be seen from the above Table 2, the solar barrier coating glass prepared by using the solar barrier coating liquid compositions according to Examples 1 to 4 exhibits a visible light transmittance of 70% or more and exhibits an infrared blocking effect, a shielding coefficient, , And adhesion were both excellent. However, the solar barrier coating glass according to Comparative Example 1 had a visible light transmittance of 70% or more, but the infrared transmittance, shielding coefficient, and solar heat acquisition coefficient were relatively high. The solar barrier coating glasses according to Comparative Examples 2 and 3 were undesirable because the visible light transmittance was as low as less than 70%, and the glasses with commercial films according to Comparative Examples 4 and 5 had poor visible light transmittance, hardness, Respectively.

As can be seen from Table 1 and FIG. 1, as the content of cesium tungsten oxide (CTO) increases, the infrared ray shielding effect is excellent, but the visible light transmittance is lowered and the cesium tungsten oxide (CTO) content Was 6 to 11% by weight, an excellent visible light transmittance of 70% or more was obtained.

3. Evaluation of the transmittance according to the content of nano-metal oxide by solar wavelength

(CTO), antimony tin oxide (ATO), and indium tin oxide (ITO) content ratios (9: 15.9: 4) according to Example 3, the total content of which was 9.8 wt%, 28.9 wt% %, And 35.0% by weight, respectively, to prepare a solar barrier coating liquid composition. The solar barrier coating glass was prepared using the same, and then the transmittance of each solar wavelength was evaluated.

As can be seen from FIG. 2, when the total content of the nano-metal oxide was 9.8 to 35.0 wt%, excellent IR blocking efficiency was shown.

4. Evaluation of the transmittance according to the particle size of nano-metal oxide by solar wavelength

The solar barrier coating liquid composition was prepared by changing the particle size of the nano-metal oxide to 20 nm, 80 nm, 130 nm, and 200 nm according to the composition of Example 3. After preparing the solar barrier coating glass , And the transmittance of each wavelength of sunlight was evaluated.

As can be seen from FIG. 3, the larger the particle size of the nano-metal oxide, the lower the transmittance in the entire solar wavelength range. When the particle size of the nano metal oxide is 200 nm, the visible light transmittance is about 30%. In order to ensure visibility, the particle size of the nano metal oxide is preferably at least 200 nm.

The glass which can be used for the solar heat shielding coating composition according to the present invention can be applied not only to a famous glass of a general silicon material but also to a functional glass such as color glass, tempered glass and bulletproof glass. It is to be understood that the present invention is not limited to the above-described embodiment, and that various changes and modifications may be made without departing from the scope of the present invention by those skilled in the art. You can do it.

In a further embodiment of the present invention, the solar barrier coating glass prepared by coating the surface of the glass with the solar barrier coating liquid according to the present invention is prepared by the following steps.

1. Step of preparing a solar barrier coating liquid

This step is a step of preparing a solar barrier coating solution using the above-mentioned composition. The details of this step are replaced with the description related to the composition of the solar barrier coating liquid.

2. Coating the solar barrier coating liquid on the glass surface

This step is a step of coating the surface of the glass shielding coating solution prepared in step 1 on the glass surface, and it can be applied by a method such as self spray coating, spray coating, dip coating, slot die coating, flow coating, spin coating, Can be coated on the surface of the glass, but the coating method is not limited to that described above.

3. Drying the glass coated with the solar barrier coating solution

This step is a step of drying the coated glass in step 2. The glass coated with the solar barrier coating solution can be dried using a method such as room temperature drying, NIR drying, hot air drying, hot plate drying, etc., Other methods can also be used.

The description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features presented herein.

Claims (1)

1. A solar thermal barrier coating composition composition comprising a nano metal oxide comprising cesium tungsten oxide (CTO), antimony tin oxide (ATO), and indium tin oxide (ITO), wherein the content of the nano metal oxide is 9.8 to 34.5 wt%.

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