KR20150028979A - Coating composition and uses thereof - Google Patents

Abstract

There is provided a coating composition comprising a photocatalytic composite and a silicone resin, wherein the content of the photocatalytic composite is about 1 to 70% by weight based on the total weight of the coating composition, and the photocatalytic composite contains a heat insulating material and a photocatalyst material . There is provided an energy saving material comprising a film formed from the coating composition of the present invention on at least one of the substrate and the surface of the substrate. Energy-saving materials can effectively block infrared (IR), substantially lowering the room temperature and reducing power consumption. In addition, in the presence of a photocatalyst capable of absorbing ultraviolet light, this material exhibits excellent superhydrophilic and self-cleaning properties and provides antibacterial and deodorizing effects.

Description

[0001] COATING COMPOSITION AND USES THEREOF [0002]

The present invention relates to a coating composition which can be coated on a substrate so that the surface of the substrate can have a self-cleaning and heat insulation effect. The present invention also relates to an energy-saving material containing a film formed from the coating composition of the present invention.

For example, there are many materials to block the thermal effects of infrared light available in markets such as building glass curtains, automotive glass, and insulation paper. In short, these materials are provided for the purpose of allowing sunlight to pass through, while heat sources (ie, thermal effects of infrared) are insulated. However, by way of example, glass with current infrared blocking properties is too expensive to manufacture and less satisfactory in effect. For example, in order to block infrared rays, ultra-violet ray absorption is known to allow the film to be inserted into glass; However, the manufacturing cost is high, and the silver is easily oxidized and the infrared blocking effect is lost.

Further, in order to form a film capable of blocking infrared rays, materials capable of blocking infrared rays (for example, titanium dioxide of high refractive index and silica of low refractive index) can be applied to glass or lens by vacuum deposition. However, the films thus produced suffer from the disadvantages of high cost, complicated manufacturing processes and unsatisfactory effects, thus failing to meet the demand for economic advantages.

In addition to the two methods described above, an alternative low cost solution has been proposed, in which pigments or dyes are incorporated into the glass to absorb infrared light in sunlight. However, when strong sunlight or scattered light is irradiated, haze similar to smoke is generated in this type of glass containing pigments or dyes, infrared absorption performance is affected, and after long use, the pigment or dye is decomposed The effect is lost.

In addition, it is known that the photocatalyst has a photocatalytic performance because it has a function of absorbing light (in particular, UV light) to excite electrons. The photocatalyst material is excited by light, and then activates water molecules or oxygen molecules in the air to form hydroxyl radicals or oxygen anions for redox reactions to decompose contaminants in the environment. Thus, the photocatalyst material can be used to remove contaminants in air or wastewater, and can inhibit the attachment of bacteria to the surface, thus exhibiting an antibacterial effect. Furthermore, when light is irradiated, free radicals or oxygen anions are formed and discharged from the photocatalyst surface due to the presence of hydrogen atoms, and an empty position is formed at the position occupied by the original oxygen. In this case, if present, the water molecules in the environment occupy an empty position, lose protons, form a hydroxyl group, and the photocatalytic material exhibits superhydrophilic properties, thereby self-cleaning and anti-fog, Effect is obtained.

Generally, in an adiabatic film or window glass coating having an infrared ray blocking and UV light absorption function, a multilayer process is required to form a composite film, and the manufacturing process is complicated and the manufacturing cost is high. Therefore, there is a continuing effort to provide materials with current IR blocking and UV light absorbing capabilities.

In order to accomplish the above object, the present invention provides a coating composition comprising a photocatalyst composite and a silicone resin wherein the content of the photocatalytic composite is about 1 to 70 wt% based on the total weight of the composition , The photocatalytic composite includes:

(1) a heat insulating material selected from the group consisting of antimony tin oxide (ATO), indium tin oxide (ITO), aluminum zinc oxide (AZO), indium zinc oxide (IZO), gallium zinc oxide (GZO), and mixtures thereof; And

(2) a photocatalyst material selected from the group consisting of titanium dioxide, zinc oxide, strontium titanate, tin oxide, and mixtures thereof, wherein the content of the photocatalyst material is about 10 to 90 wt% based on the total weight of the photocatalytic composite .

The present invention also provides an energy-saving material comprising a substrate and a film applied to at least one of the surfaces of the substrate, wherein the film is formed of a coating composition of the present invention, And a thermal insulation effect.

The coating compositions of the present invention significantly reduce the transmittance of infrared radiation by effectively insulating or reflecting heat-generating infrared radiation. This photocatalyst material exhibits UV light absorption ability, self-cleaning function, anti-fog, antibacterial and deodorizing effect. In addition, since the coating composition of the present invention can be applied to a substrate through a conventional coating method, the manufacturing process is relatively simple and cost-effective.

1 is a chart for comparison of light transmittance according to Example 1. Fig.
Figure 2 shows the rate of decomposition of the coating composition of the present invention against methylene blue, which shows the photocatalytic properties of the coating composition.
Figure 3 shows the measured contact angle of the coating composition of the present invention and water during UV light irradiation.

As used herein, the term " about "means a variation of +/- 10% of the indicated value.

The coating composition of the present invention comprises a photocatalytic complex and a silicone resin wherein the content of the photocatalytic complex is from about 1% to about 70% by weight, preferably from about 40% to about 60% by weight, %to be. If the content of the photocatalytic composite is less than 1% by weight, the infrared ray blocking and UV light absorbing effect of the composition is not sufficient. If the content is more than about 70% by weight, the dispersibility of the photocatalytic composite in the resin sharply decreases, There is a fear that the quality of the composition is lowered.

The photocatalytic composite comprises a heat insulating material and a photocatalytic material wherein the content of the photocatalytic material is from about 10% to about 90% by weight, preferably from about 40% to about 85% by weight, based on the total weight of the photocatalytic composite .

The photocatalytic composite generally has a particle size of from about 2 to about 100 nm, preferably from about 5 to about 45 nm, more preferably from 10 to 35 nm. When the particle size is less than 2 nm, the photocatalytic composite is difficult to manufacture and is impractical. When the particle size is larger than 100 nm, the total surface area becomes small to lower the transmittance of visible light, and the adiabatic effect is not good. Since the particle size of the photocatalytic composite of the present invention is smaller than the wavelength of visible light (about 380 nm to about 780 nm), when the photocatalytic composite is irradiated with light, the transmitted light is not scattered so badly as to prevent harmful influence on the quality of transmitted light do.

The thermal insulation material of the photocatalytic composite of the present invention is required to have an infrared reflectance of about 70% or more, and it is preferable to use an antimony tin oxide (ATO), indium tin oxide (ITO), aluminum zinc oxide (AZO), indium zinc oxide (IZO) Zinc oxide (GZO), and mixtures thereof.

According to a preferred embodiment of the present invention, when ITO or ATO is used as the heat insulating material of the photocatalytic composite, the photocatalytic composite is more efficient in rate because substantially the same heat insulating effect can be obtained with a smaller amount of material as compared with other materials. It has also been found that when the coating composition contains ITO, it not only effectively reflects infrared rays but also exhibits a higher visible light transmittance, and can be advantageously used as a transparent heat insulating material.

According to a preferred aspect of the present invention, when ITO is used as a heat insulating material of the photocatalytic composite, a desired transparency can be obtained. It has also been found that the use of ITO in the coating composition of the present invention is more cost effective since infrared radiation is effectively reflected and substantially the same thermal insulation effect can be obtained with a smaller amount of material compared to other materials.

In addition to the insulating material capable of blocking or reflecting infrared rays, the photocatalytic composite of the coating composition of the present invention further comprises a photocatalytic material. The photocatalyst material has a function of absorbing UV light to excite electrons and has a photocatalytic characteristic. When excited by light, the photocatalytic material decomposes contaminants in the environment by activating water or oxygen molecules in the air to form hydroxyl free radicals or oxygen anions for redox reactions. Therefore, the photocatalyst material can be used for removing contaminants in air or wastewater, and can inhibit the adhesion of bacteria to the surface, thereby exhibiting an antibacterial effect. Moreover, the photocatalytic material exhibits superhydrophilic characteristics, and moisture can be formed as an aqueous film between the adherend and the photocatalytic material, so that adherence of the adherend is reduced, and the adherent on the aqueous film can be easily removed after washing with water or rainwater . Thus, the photocatalyst material has a UV light absorption ability and a self-cleaning function, and exhibits anti-fogging, antibacterial and deodorizing effects.

Photocatalytic materials for the photocatalyst composite of the present invention may be one which is well known to those of ordinary skill in the art, for example, titanium dioxide, zinc oxide, strontium titanate (SrTiO _3), be tin oxide, or mixtures thereof And is preferably titanium dioxide which is relatively harmless to the environment or human body. In view of catalytic performance, titanium dioxide of an anatase crystal structure is preferred. Further, in order to exhibit the photocatalytic effect, the particle size of the photocatalyst material is required to be less than about 100 nm. For example, the particle size of titanium dioxide is suitably from about 1 to about 100 nm, preferably from about 5 to about 30 nm; When the particle size is less than 1 nm, titanium dioxide is difficult to produce and difficult to disperse, and when the particle size is larger than 100 nm, the catalytic effect is greatly deteriorated.

The coating composition of the present invention includes, for example, but not limited to, an acrylic resin, a fluorocarbon resin, or a silicone resin. In order to prevent the photocatalyst from being oxidized and decomposed, the binder is preferably a silicone resin. The silicone resin contained in the coating composition of the present invention is present in an amount of from about 30 wt% to about 99 wt%, preferably from about 40 wt% to about 60 wt%, based on the total weight of the coating composition.

, 또는 페닐이며; n은 실리콘 원자에 결합된 수소 원자 또는 유기라디칼의 수로, 0 내지 3의 범위이며; m은 중합도를 나타내며 2 이상의 정수이다]의 유기 폴리실록산 수지이다. 폴리실록산의 화학 구조를 구성하는 단계는 중합 사슬의 길이를 결정하는 단계, 가지화 단계 및 수소 또는 유기기를 부착하기 위한 위치를 정하는 단계를 포함한다. 화학 구조 측면에서, 문자 M (단관능기를 나타냄), D (이관능기), T (삼관능기), 및 Q (사관능기)가 중합 분자 내에 도입된 구조적 관능기를 나타내는데 이용될 수 있다.The silicone resin used in the present invention is not particularly limited, and it is well known to those skilled in the art that a main chain composed of repeating Si-O bonds, in which a hydrogen atom or an organic radical is directly bonded to a silicon atom, have, the general formula _{[R n SiO 4-n /} 2] m ( wherein, R is a hydrogen or an organic radical independently selected from the group consisting of hydrogen, C _{1 -6} alkyl, C _{2 -5} epoxy, or C _{6 -14} aryl, Preferably hydrogen, methyl, ethyl,

, Or phenyl; n is the number of hydrogen atoms or organic radicals bonded to the silicon atom, ranging from 0 to 3; and m is a degree of polymerization and is an integer of 2 or more. The step of constituting the chemical structure of the polysiloxane comprises the steps of determining the length of the polymerization chain, the stratification step and the positioning for attaching hydrogen or organic groups. In terms of the chemical structure, the letter M (representing a monofunctional group), D (a bifunctional group), T (a trifunctional group), and Q (a tetrafunctional group) can be used to represent structural functional groups introduced into the polymerizable molecule.

Examples of commercially available silicone resins are KBM-1003, KBE-402, KBE-403, KBM-502, KBM-04, KBE-13, and KBE-103 manufactured by Shin Etsu Company; And Z-6018 and 3037 manufactured by Dow Corning Company.

이다. 이러한 올리고머는 본 발명의 코팅 조성물에 더 우수한 필름 형성 특성, 분산도 및 연성, 및 경화된 후 높은 표면 경도를 부여한다.The silicone resin may be used alone or in combination of two or more kinds. The silicone resin that may be used in the present invention may be an oligomer of the formula R ¹ O- [SiR ₂ O] _w -SiR ₂ (OR ¹ ), wherein w is an integer from 1 to 1000, R ¹ is independently H, C _{1 -3} alkyl or C _{2 -5} epoxy, preferably methyl, ethyl, or

to be. These oligomers impart to the coating compositions of the present invention better film forming properties, dispersion and ductility, and high surface hardness after curing.

A suitable method for producing the silicone resin of the present invention is not particularly limited. In a preferred form of the invention, the silicone resin is formed through a sol-gel process. The sol-gel process involves suspending a raw material (generally an inorganic metal salt) of solid particles having a size of about several hundred nanometers in the liquid. In a typical sol-gel process, the reactants undergo a series of hydrolysis and polymerization reactions to produce a colloidal suspension, where the material obtained in the colloidal suspension condenses into a new phase of the solid polymer-containing solution, i. The properties of the prepared sol-gel depend on the type of raw material, the type and concentration of the catalyst, the pH value, the temperature, the amount of the solvent, the type and concentration of the alcohol and the salt.

The coating composition of the present invention is used in order to prevent direct contact between the photocatalyst and the substrate when the coating composition is coated on the surface of the substrate and to prevent deterioration of the substrate easily caused by the oxidation characteristics of the photocatalyst, And may optionally include nano-sized inorganic microfine particles so as to be coated with the inorganic microfine particle layer. When present, the amount of inorganic microparticles is from about 0.1% to about 40% by weight, based on the total weight of the composite material. The inorganic fine particles that may be used in the present invention is not particularly limited, in general, a silica (SiO _2), alumina (Al ₂ O _3), cadmium sulfide (CdS), zirconia (ZrO _2), calcium phosphate (Ca ₃ (PO ₄ ) ₂ ), calcium oxide (CaO), and mixtures thereof, with SiO ₂ being preferred. According to a preferred aspect of the present invention, the photocatalytic composite is coated with a layer of porous inorganic fine particles. Particularly, the photocatalytic composite in the composite material of the present invention is coated with the layer of the porous inorganic fine particles, so that it does not directly contact with the substrate and does not destroy the substrate, and external impurities (e.g., odor molecules and bacteria) It penetrates the inorganic particles and reaches the photocatalyst material and can be absorbed into the photocatalyst material, and is decomposed by photocatalysis, thereby achieving the purpose of cleaning, antibacterial and deodorization.

Depending on application requirements, an organic solvent may be further added to the coating composition of the present invention. When an organic solvent is used in the coating compositions of the present invention, the amount is from about 1% to about 95% by weight, preferably from about 65% to about 90% by weight, based on the total weight of the coating composition. The organic solvent may be any of those well known to those of ordinary skill in the art and may be, for example, but is not limited to, alkanes, aromatic hydrocarbons, esters, ketones, alcohols, or ether alcohols. The alkane solvents that may be used in the present invention may be selected from the group consisting of n-hexane, n-heptane, iso-heptane, and mixtures thereof. The aromatic hydrocarbon solvent which may be used in the present invention may be selected from the group consisting of benzene, toluene, xylene, and mixtures thereof. The ketone solvents that may be used in the present invention are selected from the group consisting of methyl ethyl ketone (MEK), acetone, methyl isobutyl ketone, cyclohexanone, 4-hydroxy-4-methyl- . The ester solvents that can be used in the present invention include isobutyl acetate (IBAC), ethyl acetate (EAC), butyl acetate (BAC), ethyl formate, methyl acetate, ethoxy ethyl acetate, ethoxypropyl acetate, ethyl isobutyrate , Propylene glycol monomethyl ether acetate, pentyl acetate, and mixtures thereof. Alcohol solvents that may be used in the present invention may be selected from the group consisting of ethanol, iso-propanol, n-butanol, and iso-pentanol, and mixtures thereof. The ether alcohol solvents that can be used in the present invention include ethylene glycol monobutyl ether (BCS), ethylene glycol monoethyl ether acetate (CAC), ethylene glycol monoethyl ether (ECS), propylene glycol monomethyl ether, propylene glycol monomethyl ether Acetate (PMA), propylene glycol monomethyl propionate (PMP), and mixtures thereof.

The present invention provides an energy-savng material comprising a substrate, and a film formed from the coating composition as described above on at least one surface of the substrate. The coating compositions of the present invention may be applied to at least one surface of the substrate by conventional application methods, for example, coating, spraying or dipping followed by drying to form a smooth film. Existing energy saving materials generally have a disadvantage that they have low coating hardness and scratch easily, so that it is very easy for scratches to occur in a long time after coating and the scratch-induced coating seriously affects the aesthetic appearance of articles such as window I am crazy. According to a preferred embodiment of the present invention, the film of the energy saving material has a pencil hardness of H or more, preferably 3H or more, measured according to the standard method of JIS K5400, and can effectively solve the above-described problems.

The above-described substrate may be a substrate, such as glass, plastic, building insulator, metal, ceramic tile, wood, leather, stone, concrete, mural, textile, cotton fabric, appliances, Casing, but is not limited thereto, and a heat insulating plate for a building is preferable.

According to a particular aspect of the invention, the energy-saving material comprises a film formed by applying the above-described coating composition by coating, spraying or dipping onto glass and at least one surface of the glass. The film has a thickness of from about 0.5 to about 50 micrometers. The energy saving material according to the present invention has a visible light transmittance of about 70% or more, preferably about 90% or more and a wavelength of 550 nm. The energy saving material of the present invention has an excellent visual effect and an infrared (thermal radiation) reflectance of about 70% or more and exhibits an excellent heat insulating effect, so that the room temperature can be substantially lowered and the energy consumption can be reduced , The advantage of greater energy savings and higher visible light transmittance compared to glass with the traditional insulating film available on the market, resulting in significantly reduced cost, simple application and wide application in glass curtains for buildings or automotive glass Respectively. Moreover, nearly all the thermal insulation materials (such as lanthanum hexaboride) contained in the coating composition for energy saving materials available on the market absorb infrared rays in sunlight rather than reflect them, and the absorbed infrared rays are converted into thermal energy And is stored in the glass, so that the surface temperature of the glass is increased and there is a risk that the glass is cracked.

In addition, the photocatalytic composite of the coating composition of the present invention has a super-hydrophilic property, attracting moisture in the air to form an extremely thin aqueous film between the adherend and the photocatalytic complex, and reduce adherence of the adherend. In addition, the photocatalyst can oxidize the organic deposit particles to destroy its structure, so that the particles do not adhere to the glass surface. At the time of rainfall, due to the effect of superhydrophilic properties, deposits on the aqueous film can be easily washed away when the rainwater evenly penetrates into the contact between the deposit and the photocatalyst and the rainwater accumulates in a sufficient amount, The frequency of keeping the surface of the ordinary glass clean is lowered, and a self-cleaning effect is obtained.

In the past, in order to obtain an energy-saving material, a treatment for blocking infrared rays and a treatment for absorbing UV light have been required to be performed on a substrate, and the infrared ray blocking and UV light absorbing effect is carried out by a multi- It was not until after the However, by using the coating composition of the present invention, an energy saving material having an infrared blocking and UV light absorbing effect can be obtained through a single application treatment to the surface of the substrate. Because the film applied on the substrate contains a photocatalytic material, it can absorb UV light and can provide self-cleaning, fogging, antibacterial, and deodorizing efficacy; By the presence of the adiabatic material, the film can effectively reflect infrared rays, allowing infrared rays to pass through the visible light while reducing the transmittance. Further, since the size of the particles contained in the film is smaller than the wavelength of visible light, the particles do not scatter transmitted light, and the transparency of the substrate can be maintained without affecting the quality of the transmitted light.

The present invention provides a process for preparing a coating composition which comprises obtaining an intermediate product of titanium sulfate through hydrolysis of titanium tetrachloride and then adding an adiabatic material to obtain a photocatalytic composite powder at a low temperature, Mixing and grinding the composite powder and the silicone resin to obtain the coating composition of the present invention.

According to a particular preferred form of the invention, the coating composition of the present invention is obtained by mixing appropriate proportions of sol-gel silicone resin and photocatalyst composite powder, optionally adding solvent and then pulverizing. The above-mentioned photocatalytic composite powder can be obtained by a process comprising the following steps:

(a) obtaining a white gel hydrate through hydrolysis of titanium tetrachloride;

(b) adding concentrated sulfuric acid to the hydrate obtained in the reactor and stirring for 10 to 50 minutes to obtain a titanium sulfate solution;

(c) thoroughly mixing the titanium sulfate solution and stirring at normal temperature for 0.5 to 5 hours;

(d) heating to 80 to 100 캜 and reacting at a constant temperature for 2 to 7 hours; And

(TiO ₂ + ITO) powder (e) ITO powder was added in an appropriate ratio, and the mixture was stirred for 1 to 4 hours, mixed and dripped with a 4-6 M aqueous sodium hydroxide solution, ≪ / RTI >

The present invention is further illustrated by the following examples. It is to be understood that the following examples are merely illustrative of the present invention and are not intended to limit the scope of the present invention. Any changes or modifications that are obvious to one of ordinary skill in the art and which do not depart from the spirit and principles of the invention should fall within the scope of the invention.

Example

In the following examples and comparative examples, unless otherwise stated,% by weight.

Example  One

200 ml of 3.9 M titanium tetrachloride solution was diluted with water to a total volume of 2000 ml and then 500 ml (5 M) of aqueous ammonia was added dropwise to yield a white titanium hydroxide precipitate, which was filtered, Titanium hydroxide [Ti (OH) ₄ ] was obtained as a white gel by washing with deionized water (200 ml x 3) to remove residual water.

100-150 g of concentrated sulfuric acid (18M) was added to 250 g of the above titanium hydroxide and stirred for 30 minutes to obtain a clear and clear titanium sulfate solution. After putting a titanium sulfate solution in the reactor, it was added to 32.2 g of SiO ₂ solution (20%), and stirred at room temperature for 4 hours, then heated to 100 ℃ allowed to react for 2 hours. 100 g of ITO aqueous solution (10%) was added, and the reaction was stirred at room temperature for 2 hours to obtain a mixture.

After dropwise addition of 600 mL (5 M) of aqueous sodium hydroxide solution, the resulting solution was adjusted to neutral pH, and the resulting precipitate was filtered, washed and dried at room temperature to give a grayish blue powder which was purified via XRD Anatase type photocatalyst and ITO photocatalytic complex.

The obtained photocatalytic composite was added to a silicone resin (having a solids content of 27%) at a ratio (weight ratio) of 1: 3 of the photocatalytic composite: resin, and the mixture was stirred, To form a coating. Light transmittance measurement, organic (methylene blue) decomposition test, hydrophilic characteristic test, and adiabatic test were carried out.

The blank glass plate and the coating were placed in a UV / visible / near infrared spectrometer (Model V-570, manufactured by JASCO Incorporation), and the light transmittance was measured in the range of UV light to near-infrared light. The test results are shown in Fig. 1 (here, the range between two vertical lines represents visible light). The zigzag line represents the transmittance value (the transmittance is about 100%) of the uncoated glass plate, the continuous line represents the transmittance value of the glass plate having a single coating on one surface, and the dotted line represents the transmittance value of the glass plate coated on both surfaces . From the test results, it can be seen that the coating of the present invention can greatly reduce the transmittance of UV light and near-infrared light and can effectively block UV light and near-infrared light.

(35 ± 0.3) ml of methylene blue was added to a cylindrical test column having an internal diameter of 40 mm and a height of 30 mm, and then a rectangular glass having a side length of (60 ± 2) mm and a coating was placed thereon. (1.00 ± 0.05) mW / cm 2 of UV light was applied to the coating for a total of 6 hours, and the decomposition rate of methylene blue was measured every hour. The test results are shown in Fig. From the test results, it can be confirmed that the coating of the present invention can effectively decompose the organic material (methylene blue) at the time of UV light irradiation, and has a photocatalytic property.

A square glass of side length (100 ± 2) mm with a coating on the test plate was taken, 1 μl of water was contacted with the test plate, the image was captured and the contact angle was measured with a contact angle tester. (1.0 +/- 0.1) mW / cm < 2 > of UV light was applied to the coating, and the contact angle was measured every 50 hours. The test results are shown in Fig. From the test results, it can be confirmed that the coating of the present invention has superhydrophilic properties at the time of UV light irradiation.

The coating was placed about 20 cm below the infrared light bulb (PHILIPS Corporation), and a beaker containing 100 g of water was placed at a position of about 15 cm below the glass coating, irradiated with an infrared bulb, and an infrared thermometer (TES series, TES Electrical Electronic Corp.) to measure the surface temperature regularly every 5 minutes. The test results are shown in Table 1, and the surface temperature of the coating after 30 minutes of irradiation is shown in Table 2 below.

Example  2

200 ml of 3.9 M titanium tetrachloride solution was diluted with water to a total volume of 2000 ml and then 500 ml (5 M) of aqueous ammonia was added dropwise to produce a white titanium hydroxide precipitate, which was filtered and washed with deionized water (200 mL x 3) to remove residual water to obtain titanium hydroxide [Ti (OH) ₄ ] as a white gel.

100 to 150 g of concentrated sulfuric acid (18M) was added to 250 g of the above titanium hydroxide and stirred for 30 minutes to obtain a clear and clear titanium sulfate solution. After putting a titanium sulfate solution in the reactor, it was added to 32.2 g of SiO ₂ solution (20%), and stirred at room temperature for 4 hours, then heated to 100 ℃ allowed to react for 2 hours. 100 g of ATO aqueous solution (15%) was added, and the reaction was stirred at room temperature for 2 hours to obtain a mixture.

The resulting solution was adjusted to neutral pH, and the resulting precipitate was filtered, washed and dried at room temperature to give a dark blue powder, which was purified via an XRD to anatase < RTI ID = 0.0 > Type photocatalyst and a photocatalytic complex of ATO.

The obtained photocatalytic composite was added to a silicone resin (having a solids content of 27%) at a ratio (weight ratio) of 1: 3 of the photocatalytic composite: resin, and the mixture was stirred, ≪ / RTI > An insulation test was conducted.

The coating was placed at a position about 20 cm below the infrared light bulb (PHILIPS Corporation), and a beaker containing 100 g of water was placed at a position of about 15 cm below the glass coating, irradiated with an infrared bulb, (TES series, TES Electrical Electronic Corp.). The test results are shown in Table 1 below, and the surface temperature of the coating after 30 minutes of irradiation is shown in Table 2 below.

Comparative Example  One

200 ml of 3.9 M titanium tetrachloride solution was diluted with water to a total volume of 2000 ml and then 500 ml (5 M) of aqueous ammonia was added dropwise to produce a white titanium hydroxide precipitate which was filtered and washed with deionized water (200 mL x 3) to remove residual water to obtain titanium hydroxide [Ti (OH) ₄ ] as a white gel.

100 to 150 g of concentrated sulfuric acid (18M) was added to 250 g of the above titanium hydroxide and stirred for 30 minutes to obtain a clear and clear titanium sulfate solution. After putting a titanium sulfate solution in the reactor, it was added to 32.2 g of SiO ₂ solution (20%), and stirred at room temperature for 4 hours, then heated to 100 ℃ allowed to react for 2 hours. 100 g of an aqueous solution of lanthanum hexaboride (10%) was added, and the reaction was stirred at room temperature for 1 hour to obtain a mixture.

The resulting precipitate was filtered, washed and dried at room temperature to obtain a gray-blue powder, which was subjected to XRD to produce an anatase-type photocatalyst and a solution of lanthanum hexaboride Photocatalytic complex.

The obtained photocatalytic composite was added to a silicone resin (having a solids content of 27%) at a ratio (weight ratio) of 1: 3 of the photocatalytic composite: resin, and the mixture was stirred, To form a coating. (Using an infrared light bulb, PHILIPS Corporation).

The coating was placed at a position of about 20 cm below the infrared bulb and irradiated with an infrared bulb placed at a position of 15 cm below the glass coating with a beaker containing 100 g of water and the surface temperature was read every 5 minutes using an infrared thermometer (TES series, TES Electrical Electronic Corp.). The test results are shown in Table 1, and the surface temperature of the coating after 30 minutes of irradiation is shown in Table 2 below.

Comparative Example  2

A commercial insulating paper (SD series Top Color, manufactured by Top Color Film Co., Ltd.) was attached to a glass surface, placed at a position of about 20 cm under an infrared bulb, and a beaker containing 100 g of water was placed under a glass attachment Placed at a position of about 15 cm, irradiated with an infrared bulb, and the surface temperature was regularly measured every five minutes with an infrared thermometer (TES series, TES Electrical Electronic Corp.). The test results are shown in Table 1 below, and the surface temperature of the adherend after 30 minutes of irradiation is shown in Table 2 below.

Temperature test (℃) Time (minutes) Glass Example 1 Example 2 Comparative Example 1 Comparative Example 2 0 24 24 24 24 24 5 34 34 33.8 34 34.8 10 39.8 35.3 34.7 38.3 39.3 15 42.6 39.8 38.5 40.1 40.9 20 45 42.3 39.8 43.1 44.1 25 46.1 43.6 42 45.8 44.8 30 48.6 43.6 43 46.5 45.1

Temperature of glass after 30 minutes of irradiation (캜) Time (minutes) Glass Example 1 Example 2 Comparative Example 1 Comparative Example 2 30 70.8 60 61.4 86 68.4

From the comparison of the results in Table 1, it can be seen that applying a coating having the coating composition of the present invention to a glass surface effectively results in heat insulation.

From the comparison of Examples 1 and 2 and Comparative Example 1, it can be seen that the coating composition of the present invention can effectively reflect infrared rays, and the lower surface temperature of the glass can prevent the risk of cracking of the glass have.

From the comparison of Examples 1 and 2 and Comparative Example 2 it can be seen that the coating composition of the present invention provides a lower surface temperature of the glass coating as compared to the insulating paper. The present coating composition can be applied more easily than the insulating paper and can provide a better adiabatic effect because it is less likely to accumulate thermal energy or generate heat convection.

Claims (11)

1. A coating composition comprising a photocatalytic composite and a silicone resin,
The content of the photocatalytic composite is about 1 to 70% by weight based on the total weight of the composition,
In the photocatalytic composite,
(1) a heat insulating material selected from the group consisting of antimony tin oxide (ATO), indium tin oxide (ITO), aluminum zinc oxide (AZO), indium zinc oxide (IZO), gallium zinc oxide (GZO), and mixtures thereof; And
(2) a photocatalyst material selected from the group consisting of titanium dioxide, zinc oxide, strontium titanate, tin oxide, and mixtures thereof,
The content of the photocatalyst material is about 10 to 90% by weight based on the total weight of the photocatalytic composite
Coating composition.
The method according to claim 1,
The silicone resin is prepared through a sol-gel process
Coating composition.
The method according to claim 1,
Further comprising an organic solvent
Coating composition.
The method according to claim 1,
The insulating material may be ATO or ITO
Coating composition.
The method according to claim 1,
The content of the photocatalyst material is about 40 to 85 wt% based on the total weight of the photocatalytic composite
Coating composition.
The method according to claim 1,
The photocatalyst material may be titanium dioxide
Coating composition.
The method according to claim 1,
Wherein the photocatalytic composite has a particle size of about 2 to 100 nm
Coating composition.
The method according to claim 1,
(SiO ₂ ), alumina (Al ₂ O ₃ ), cadmium sulfide (CdS), zirconia (ZrO ₂ ), calcium phosphate (Ca ₃ (PO ₄ ) ₂ ), calcium oxide Further comprising an inorganic fine particle selected from the group consisting of
Coating composition.
materials; And
Comprising a film formed from a coating composition according to claim 1 on at least one surface of said substrate
Energy saving material.
10. The method of claim 9,
The film is formed by coating, spraying or dipping a coating composition according to claim 1 on at least one surface of the substrate
Energy saving material.
10. The method of claim 9,
The film has a pencil hardness of H or higher measured according to the standard method of JIS K5400
Energy saving material.

Images