WO2017074079A1 - Solar-heat-blocking coating solution composition - Google Patents

Abstract

The present invention relates to a solar-heat-blocking coating solution composition for blocking solar heat, the composition containing: a nano metal oxide including a cesium tungsten oxide (CTO); an antimony tin oxide (ATO); and an indium tin oxide (ITO). The amount of the nano metal oxide in the solar-heat-blocking coating solution composition of the present invention is 9.8-34.5 wt%, preferably 30-34.5 wt%, and the amount of the cesium tungsten oxide (CTO) is 4-15 wt%, preferably 6-11 wt%, and more preferably 8-10 wt%. The solar-heat-blocking coating solution composition of the present invention maintains the transparency of glass without thickly applying a coating solution, has excellent visible ray transmittance, infrared ray blocking ratio, hardness, adhesive properties, and the like, and is directly applied on the glass instead of the often conventionally used film type, so as to exhibit an effect of providing a solar-heat-blocking coated glass for performing a solar heat blocking function.

Description

Sunscreen coating liquid composition

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

Normally, the wavelength of sunlight can be classified into gamma rays, X-rays, ultraviolet rays, visible rays, infrared rays, ultra-short waves, and radio waves. Among them, the wavelengths we perceive with visual sunlight are in the visible range, and the wavelengths of sunlight in everyday life are infrared rays. The wavelength is longer than the visible light region. In addition, general glass reflects only a part of the infrared portion, so in summer, radiant heat generated from outdoor solar heat enters the room and increases the room temperature, thereby reducing energy efficiency of the air conditioner. In connection with this reality, the glass coated with the preferred sunscreen coating liquid composition should have a good heat shielding effect to prevent the external solar heat entering the room in the summer.

Specifically, in order to impart an excellent heat shielding effect to the glass, a heat ray reflecting glass is used, but its visible light transmittance is 40%, and there is a problem in that visibility is not good. Another case to improve the heat shielding effect is to attach and shield the film. In this case, the adhesion performance is deteriorated when the adhesive is exhausted, and it is difficult to rework due to the remaining adhesive when the film is removed, and the color of the film is generally limited. It is difficult to control the transmission or reflectance of light.

In addition, low-e glass using a sputtering coating method has been released and sold in order to improve the thermal insulation effect of the glass (Patent No. 10-1544070), but the coating part to prevent the coating from being oxidized. It must be configured to be embedded in the glass plate of the multilayer, and the structure of the glass plate of the multilayer to be filled with an inert gas is difficult to manufacture, and the production of the multilayer glass requires an edge stripping treatment equipment, which is difficult to manufacture and handle. However, the manufacturing cost is expensive. In addition, the development of a product having all of heat insulation, shielding performance, hardness, etc. among the low-e glass is insufficient.

Therefore, the visible light transmittance is high, while ensuring visibility, infrared transmittance is low, showing excellent solar heat shielding effect, and excellent physicochemical properties such as adhesion, there is a need for continuous research and development of a high thermal barrier coating liquid composition.

The present invention has been made in order to improve the problems according to the conventional sunscreen coating composition and technology using the same, a problem that the visibility is not good or the cost is higher than necessary during the cooling of the summer due to not high visible light transmittance or low infrared transmittance, And it is an object of the present invention to provide a sunscreen coating liquid composition that can solve the problem of poor physicochemical properties such as adhesion, such that the duration of solar heat shielding is not long, re-installation, or difficult to handle.

In order to solve the above problems, the inventors of the present invention include the content of the nano metal oxide in the sunscreen coating liquid composition in an amount of 9.8 to 34.5% by weight, preferably 30 to 34.5% by weight, and cesium tungsten oxide in the nanometal oxide ( A sunscreen coating liquid composition is provided wherein the content of CTO) is from 4 to 15% by weight, preferably from 6 to 11% by weight, more preferably from 8 to 10% by weight.

The glass using the sunscreen coating composition according to the present invention having the above configuration exhibits the effect of reducing the illumination load by maintaining a high visible light transmittance of 70% or more visible light transmittance measured at 520 nm. In addition, the glass using the sunscreen coating composition according to the present invention achieves the effect that the infrared transmittance measured at 1200 nm is 38% or less, preferably 30% or less, effectively blocking the near infrared region that occupies most of the solar radiation energy Cooling costs are reduced by reducing the amount of solar heat entering the room during the summer months.

Furthermore, by solving the above problems, the sunscreen coating composition according to the present invention, while maintaining the transparency of the glass, the thickness of the coating solution is not thick, excellent in the visible light transmittance, infrared ray blocking rate, hardness, adhesion, etc. It is effective to provide a sunscreen coating glass that performs a sunscreen function by coating directly on the glass rather than the film form that is used a lot.

1 is a graph of transmittance for each wavelength of sunlight according to cesium tungsten oxide (CTO) content (the horizontal axis is wavelength (nm) and the vertical axis is transmittance (%)).

2 is a graph of transmittance for each wavelength of sunlight according to the content of nano metal oxide (the horizontal axis is wavelength (nm) and the vertical axis is transmittance (%)).

3 is a graph of transmittance for each wavelength of sunlight according to the particle size of the nano metal oxide (the horizontal axis is wavelength (nm) and the vertical axis is transmittance (%)).

Various embodiments and / or aspects are now disclosed 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 one of ordinary skill in the art that this aspect (s) may be practiced without these specific details. The following description and the annexed drawings set forth in detail certain illustrative aspects of the one or more aspects. However, these aspects are exemplary and some of the various methods in the principles of the various aspects may be used and the descriptions described are intended to include all such aspects and their equivalents.

In addition, the term “or” is intended to mean an inclusive “or” rather than an exclusive “or”. In other words, unless specified otherwise or unambiguously in context, "X uses A or B" is intended to mean one of the natural implicit substitutions. That is, X uses A; X uses B; Or where X uses both A and B, "X uses A or B" may apply in either of these cases. Also, it is to be understood that the term "and / or" as used herein refers to and includes all possible combinations of one or more of the related items listed.

In addition, the terms "comprises" and / or "comprising" mean that such features and / or components are present, but exclude the presence or addition of one or more other features, components, and / or groups thereof. It should be understood that it does not. Also, unless otherwise specified or in the context of indicating a singular form, the singular in the specification and claims should generally be interpreted as meaning "one or more."

The sunscreen coating composition according to an aspect of the present invention is characterized in that it comprises a nano metal oxide including cesium tungsten oxide (CTO), antimony tin oxide (ATO), and indium tin oxide (ITO). The sunscreen coating composition according to the present invention is not a thick film, but maintains the transparency of the glass, excellent visible light transmittance, infrared cutoff, hardness, adhesion, etc. Direct coating on has the effect of providing a sunscreen coating glass that performs a sunscreen function.

Hereinafter, the present invention will be described in detail.

The sunscreen coating liquid composition according to the present invention comprises a nano metal oxide including cesium tungsten oxide (CTO), antimony tin oxide (ATO), and indium tin oxide (ITO), the content of the nano metal oxide is 9.8 to 34.5 weight %, Preferably 30 to 34.5% by weight, of which 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.

In addition, one aspect of the present invention has a visible light transmittance of 70% or more measured at 520 nm.

In addition, one aspect of the present invention is the infrared transmittance measured at 1200 nm is 13% or less.

In addition, one aspect of the present invention is 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 material of the nano metal oxide ink, is composed of a nano metal oxide having a property of blocking the light in the infrared region of the solar light. Since most nano metal oxides bond metals, the interval between molecules is constant. It can be used to block most of the infrared rays in the general structure, so that all of the general nano metal oxides can be used, but in the present invention the metal of cesium tungsten oxide (CTO), antimony tin oxide (ATO), and indium tin oxide (ITO) Preference is given to using oxides.

The content of the nano metal oxide is 9.8 to 34.5% by weight, preferably 30 to 34.5% by weight, most preferably 28.9% by weight. Including less than 9.8% by weight of nano metal oxides, the infrared blocking effect by the nano-metal oxides is low, so the thermal barrier performance is very insignificant, when containing more than 34.5% by weight it takes a lot of time to control the particle size of the nano metal oxides In order to properly disperse the nano metal oxide, a range within the content ratio of 9.8 to 34.5% by weight is preferable.

The content of cesium tungsten oxide (CTO) in the nano metal oxide is preferably 4 to 15% by weight, preferably 6 to 11% by weight, more preferably 8 to 10% by weight, cesium tungsten having the above content range. Oxide (CTO) has the property of high infrared blocking effect when coating on glass, and visible light transmittance can be maintained at a high level of 70% or more, and can effectively block infrared rays from a near infrared region to a wide wavelength range close to the visible region. .

Since visibility is ensured when the visible light transmittance measured at 520 nm is generally 70% or more, the sunscreen coating glass prepared using the sunscreen coating composition according to the present invention has a visible light transmittance measured at 520 nm of 70% or more. desirable. When the visible light transmittance of the sun shield coating glass is less than 70%, visibility may not be secured, and thus an illumination load may increase and transparency may be deteriorated.

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

The particle size of the nano metal oxide is preferably 20 to 200 nm when the sunscreen coating composition comprising the nano metal oxide is coated on the glass. If the particle size of the nano metal oxide is less than 20 nm, the specific surface area becomes large, resulting in a decrease in dispersibility and an increase in material price. If the particle size exceeds 200 nm, haze caused by the nano metal oxide particles is generated, and thus the visible light transmittance is 30. It is preferable to use a nano metal oxide in the above range because the problem of lowering to less than% and uneven coating surface occurs.

The sunscreen coating composition according to the present invention may include a dispersant to effectively disperse the nano metal oxide, but the type of dispersant that can be used is not limited, but 2-2-2-methoxyethoxy ethoxy acetic acid ( 2-2-2-Methoxyethoxy ethoxy acetic acid, 5-Methoxy pentyloxy acetic acid, 3,6,9-trioxadecanoic acid, 3,6,9-Trioxadecane acid, Palmitic acid, Stearic acid, Propionic acid, Sodium polyacrylate, Ammonium polyacrylate, Cetyltrimethyl ammonium bromide (CTAB) , Polyacrylic sodium salt (Polyacrylic sodium salt), dodecyl benzene sulfonate (Dodecyl benzene sulfonate) or sodium dodecyl sulfate (SDS) It is preferable to use any one or more. The dispersant of the present invention having the above constitution has affinity for the surface of the nano metal oxide, and has a functional group which allows the nano metal oxide to be adsorbed on the surface of the dispersant to be effectively dispersed in the solvent, and at the same time, the molecules produced by the nano metal oxide adsorbed. Since the carbon structure such as alkyl (-R) or alkoxy (-OR) in the form of a chain to allow its own structure to be stable in the solvent, it has a superior dispersibility and stability than the general dispersant do.

The solvent used for preparing the nano metal oxide ink in the sunscreen coating composition according to the present invention is water, methanol, butyl glycol in consideration of ink dispersibility and stability, toxicity, viscosity, chemical stability, thin film coating ease, drying conditions, etc. Compounds having the structures of R 1 -O-R 2 and R 1 -CO-R 2 can be used, such as isopropyl glycol, aryl glycol, ethyl acetate, dibutyl ether, methyl ethyl ketone, and dimethylformamide. As the carbon number of the substituents R1 and R2 increases, the molecular volume constituting the solvent increases and the number of electrons increases, thereby increasing the asymmetry of the distribution of electrons in the molecule and causing polarization to increase the self-dispersion force of the ink solvent molecules. Therefore, the dispersing force induces electrostatic induction of the nano metal oxide and the ink solvent molecules, thereby causing the intermolecular agglomeration phenomenon, which causes a problem that the nano metal oxide particles cannot be effectively dispersed in the nano metal oxide ink. do. Therefore, the substituents R 1 and R 2 of the solvent are hydrogen, ether groups, ester groups, and amide groups substituted with n-alkyl groups, iso-alkyl groups, heteroaryl groups, aryl groups, or alkyl groups having 1 to 10 carbon atoms, each having 1 to 10 carbon atoms. It is preferable to use the constituted substituent as the ink solvent of the present invention because the volume of the substituent and the number of electrons are suitable so that the nano metal oxide particles do not cause aggregation due to the dispersing force of the molecules constituting the ink solvent.

In addition, by using mechanical methods such as bead milling, ball milling, and ultrasonic milling in order to disperse the nano metal oxide of the nano metal oxide ink in the solvent, it is possible to prevent the aggregation of the dye by the attraction force between the nano metal oxide particles more effectively and uniformly. Can be distributed.

Furthermore, the sunscreen coating liquid composition according to the present invention may include a water dispersion polyurethane (PUD) binder liquid. The water dispersion polyurethane (PUD) binder liquid functions as an ink binder, and is a component for increasing ink viscosity in accordance with product specifications. The water dispersion polyurethane (PUD) binder liquid 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 water-dispersed polyurethane (PUD) binder liquid may include a surfactant to improve dispersibility, such surfactants include polyvinyl alcohol, polyvinylpyrrolidone, methyl cellulose (MC), ethyl cellulose ( Water-soluble polymers such as EC) and styrene-maleic anhydride copolymers; Anionic surfactants such as sodium oleate and sodium lauryl sulfate; Nonionic surfactants such as polyoxyethylene alkyl ether, polyoxyethylene alkyl phenyl ether, polyoxyethylene fatty acid ester, sorbitan fatty acid ester, polyoxy sorbitan fatty acid ester, polyoxyethylene alkylamine and glycerin fatty acid ester; And cationic surfactants including quaternary ammonium such as lauryl amine acetate, alkyl amine salts and lauryltrimethyl ammonium chloride, and include 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 inorganic dispersants such as calcium carbonate, magnesium carbonate, calcium hydroxide, magnesium hydroxide, aluminum hydroxide, calcium metasilicate, calcium lactate, barium sulfate, colloidal silica and fumed silica, and the like.

<Example>

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

1. Composition of the sunscreen coating liquid composition and the sunscreen coating glass using the same

Example 1

(1) A sunscreen coating liquid composition having a composition of Example 1 in Table 1 below was prepared.

(2) After injecting the above-mentioned sunscreen coating composition composition into the sprayer, and coated on the surface of one side of the clear 6 mm thick transparent glass using a spin coating method.

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

Example 2

(1) A sunscreen coating liquid composition having a composition of Example 2 in Table 1 below was prepared.

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

(3) A sunscreen coating liquid coated on the glass surface was dried in the same manner as in Example 3, to prepare a sunscreen coating glass.

Example 3

(1) A sunscreen coating liquid composition having a composition of Example 3 in Table 1 below was prepared.

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

(3) A sunscreen coating liquid coated on the glass surface was dried in the same manner as in Example 3, to prepare a sunscreen coating glass.

Example 4

(1) A sunscreen coating liquid composition having a composition of Example 4 in Table 1 below was prepared.

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

(3) A sunscreen coating liquid coated on the glass surface was dried in the same manner as in Example 3, to prepare a sunscreen coating glass.

Comparative Example 1

(1) To prepare a sunscreen coating liquid composition having a composition of Comparative Example 1 in Table 1.

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

(3) A sunscreen coating liquid coated on the glass surface was dried in the same manner as in Example 3, to prepare a sunscreen coating glass.

Comparative Example 2

(1) To prepare a sunscreen coating liquid composition having a composition of Comparative Example 2 in Table 1.

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

(3) A sunscreen coating liquid coated on the glass surface was dried in the same manner as in Example 3, to prepare a sunscreen coating glass.

Comparative Example 3

(1) A sunscreen coating liquid composition having a composition of Comparative Example 3 in Table 1 below was prepared.

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

(3) A sunscreen coating liquid coated on the glass surface was dried in the same manner as in Example 3, to prepare a sunscreen coating glass.

[Comparative Example 4]

We put commercially available thermal barrier film (M company) on one surface of transparent glass of 6mm thickness that we polished clearly.

[Comparative Example 5]

We put commercially available thermal barrier film (T company) on one surface of transparent glass of 6mm thickness that we polished neatly.

2. Property evaluation

[Assessment Methods]

The glass of the said Example and a comparative example is evaluated by the following physical property evaluation method.

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

Visible light transmission at 520 nm and infrared light transmission at 1200 nm were measured using a UV / VIS / NIR spectrometer (Cary 5000).

(2) hardness

Using a Mitsubishi pencil, the load was measured at 1 kg, an angle of 45 degrees, a speed of 50 mm / min, and a transfer distance of 100 mm.

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

Cary-500 spectrophotometer and Nicolet 5700 were calculated using Window 5.2 program developed based on ISO 9050 by LBNL in USA. The shielding coefficient (SC) is a ratio of shielding radiant energy to a value of 1 when all light passes, and the closer to 0, the more the solar heat is shielded. The solar heat acquisition coefficient (SHGC) represents the ratio of the solar energy introduced into the room through the window of the incident solar energy.

(4) adhesion

Cut the coating film horizontally and vertically at 1mm intervals to make 100 squares, and then put the coated glass in 100 ℃ boiling water for 30 minutes, remove it, attach the cellophane tape evenly to the cutting surface, and then immediately detach and remove the number of squares remaining on the cutting surface. Observe.

 [Evaluation results]

As can be seen from Table 2, the sunscreen coating glass prepared using the sunscreen coating liquid composition according to Examples 1 to 4 exhibits a desirable visible light transmittance of 70% or more, infrared blocking effect, shielding coefficient, solar heat acquisition coefficient, hardness , And adhesion were excellent. However, the sunscreen coating glass according to Comparative Example 1 had a visible light transmittance of 70% or more, but an infrared ray transmittance, a shielding coefficient, and a solar heat acquisition coefficient were relatively high. The solar barrier coating glass according to Comparative Examples 2 and 3 was not preferable because the visible light transmittance was less than 70%, and commercially available film-attached glass according to Comparative Examples 4 and 5 had poor visibility, hardness, and adhesion. It was.

As can be seen from Table 1 and FIG. 1, as the content of cesium tungsten oxide (CTO) increases, the infrared ray blocking effect is improved, but the visible light transmittance is lowered. As shown in Examples 1 to 4, cesium tungsten oxide (CTO) content In the case of 6 to 11% by weight, excellent visible light transmittance of 70% or more was obtained.

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

Cesium tungsten oxide (CTO), antimony tin oxide (ATO), and indium tin oxide (ITO) content ratio (9: 15.9: 4) according to Example 3, with a total content of 9.8% by weight and 28.9% by weight %, And 35.0% by weight to prepare a sunscreen coating liquid composition, by using it to prepare a sunscreen coating glass, and then evaluated the transmittance for each wavelength of sunlight.

As can be seen from Figure 2, when the total content of the nano-metal oxide is 9.8 to 35.0% by weight showed excellent infrared blocking efficiency.

4. Evaluation of transmittance by wavelength of sunlight according to particle size of nano metal oxide

Has a composition according to Example 3, but the nano-metal oxide particle size was changed to 20 nm, 80 nm, 130 nm, and 200 nm to prepare a sunscreen coating liquid composition, using this to prepare a sunscreen coating glass The transmittance of each wavelength was evaluated.

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

The glass which can use the sunscreen coating composition according to the present invention as defined above is applicable to functional glass such as colored glass, tempered glass, bulletproof glass, as well as the famous glass of general silicon material, and the above is a preferred embodiment of the present invention. It has been described with reference to, the present invention is not limited to the above embodiments, those skilled in the art through the above embodiments are carried out in various modifications without departing from the spirit of the present invention. You can do it.

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

1. Preparation of the sunscreen coating liquid

This step is to prepare a sunscreen coating solution using the above-mentioned composition. Details of this step are replaced by the description related to the composition of the sunscreen coating solution.

2. Coating the sunscreen coating on the glass surface

This step is a step of coating the surface of the sunscreen coating liquid prepared in step 1. Self spray coating, spray coating, dip coating, slot die coating, flow coating, spin coating, inkjet coating, etc. The sunscreen coating liquid can be used to coat the glass surface, but the coating method is not limited to the above.

3. Drying the glass coated with the sunscreen coating liquid

This step is a step of drying the glass coated in step 2 using a method such as room temperature drying, NIR drying, hot air drying, hot plate drying can dry the glass coated on the surface of the solar barrier coating liquid, the drying method It can also dry by other methods.

The description of the presented 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 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 should not be limited to the embodiments set forth herein but should be construed in the broadest scope consistent with the principles and novel features set forth herein.

As described above, related contents have been described in the best mode for carrying out the invention.

The present invention relates to a coating liquid composition, and more particularly, may be used in a solar thermal coating liquid composition for solar heat shielding.

Claims (7)

1. A sun shield coating liquid composition comprising a nano metal oxide including 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%.
2. According to claim 1, The content of the nano-metal oxide is 30 to 34.5% by weight, the sunscreen coating liquid composition.
3. According to claim 1, The cesium tungsten oxide (CTO) content of 4 to 15% by weight, the sunscreen coating composition.
4. The sunscreen coating composition according to claim 3, wherein the cesium tungsten oxide (CTO) is 6 to 11 wt%.
5. The method of claim 4, wherein the cesium tungsten oxide (CTO) content of 8 to 10% by weight, the sunscreen coating composition.
6. The sunscreen coating composition according to any one of claims 1 to 5, wherein the visible light transmittance measured at 520 nm is 70% or more.
7. The sunscreen coating composition according to any one of claims 1 to 5, wherein the nano metal oxide has a particle size of 20 to 200 nm.

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