KR102102639B1 - Paint composition comprising heat exchange materials and method for forming coating layer - Google Patents

Abstract

The present invention is 5 to 15 parts by weight of an acrylic resin; 25 to 35 parts by weight of water-soluble polyurethane resin; Urethane-modified polycarbonate resin 8 to 15 parts by weight; 5 to 20 parts by weight of curing agent; 2 to 10 parts by weight of pigment; 3 to 10 parts by weight of heat transfer material; 10 to 30 parts by weight of a solvent; And 3 to 15 parts by weight of a heat exchange material, wherein the heat exchange material provides a coating material comprising a polymer material having a cavity structure and a metal oxide layer formed on the surface of the polymer material.
The coating composition according to the present invention is mixed with a water-soluble polyurethane resin and a urethane-modified polycarbonate resin in an acrylic resin to include all of the advantages of an acrylic resin, a urethane resin and a polycarbonate resin, and thus has excellent coating properties such as adhesion and abrasion resistance. , Including heat-exchanging materials that can convert thermal energy into kinetic energy, the heat shielding effect and the insulation effect are excellent, and energy consumption can be reduced.

Description

Paint composition comprising heat exchange materials and method for forming coating layer

The present invention relates to a coating composition comprising a heat exchange material and a method of forming a coating film on a structure using the coating composition.

Due to the indiscriminate development, climate environment problems such as ozone depletion, global warming, and tropical nights are frequently occurring, and these climate environment problems are urgently needed to be solved worldwide. Various solutions are being sought.

Accordingly, the government's efforts to achieve low-carbon green growth, including the recent implementation of a national movement to reduce greenhouse gases by the Ministry of Environment, are being made, and many companies are applying various new environmental-related products under the slogan of eco-friendly and friendly human beings. In particular, the paint industry is also striving to develop technologies that can induce energy savings and CO ₂ savings.

As an example, conventionally, a general type heat shield coating method of blocking heat by applying it to a wall surface and focusing on reflection and heat insulation has been developed and applied to the wall surface to prevent the wall surface from becoming hot.

Specifically, the general type heat shielding paint reflects light of a wavelength (750 to 2,500 nm) in the near-infrared region of the sunlight, which is the main cause of temperature rise, with a high reflectance to prevent an increase in the surface temperature of the wall surface, and a hollow sphere (hollow) in the coating film It is known as an eco-friendly energy-saving coating system technology that reduces or eliminates unnecessary energy consumption by fundamentally blocking or alleviating heat accumulation by introducing spheres) to interfere with heat conduction to the resin.

However, the general type heat shielding paint has a problem in that a reflection effect is reduced due to formation of a contaminated surface after a certain period of time has passed. The width of the product is narrow, and there is a problem that it does not affect the reduction of radiant heat. In addition, in winter, the temperature of the general heat shield paint is lower than that of the general paint, which results in an increase in heating costs, so that economic effects are expected in all seasons. There is a difficult problem.

On the other hand, the heat exchange paint is a paint made by incorporating a new technology called energy exchange in order to solve the problems of the above-mentioned general type heat shield paint, and a special heat exchange material is introduced into the coating film to convert heat energy into kinetic energy, and such energy exchange in the surface layer It is a paint that lowers the temperature by allowing most heat to be consumed as kinetic energy by action.

In particular, the heat exchange paint not only maintains a pleasant environment by inducing the effect of lowering the external surface temperature and the indoor temperature in summer, but also has the effect of reducing the ambient temperature by reducing the radiant heat of the surface, and also has an insulating effect and dew condensation in winter. By preventing the phenomenon, it is possible to induce the effect of reducing greenhouse gas (CO ₂ ) as well as reducing air-conditioning and heating costs.

However, research on water-based heat-exchange paints is insufficient in the past, and research on this is necessary.

(Document 01) Korean Patent Publication No. 10-2009-0093128 (Publication Date: 2009.09.02.) (Document 02) Korean Registered Patent No. 10-1461172 (Publication date: 2014.12.04.) (Document 03) Korean Registered Patent No. 10-0909785 (Publication date: 2009.07.27.)

The present invention has been devised to solve the problems of the prior art as described above, the inventors of the present invention for a heat exchange coating composition that has excellent coating film properties, excellent heat shielding effect and heat insulation effect, and can reduce energy consumption. It is intended to provide technical content.

In order to achieve the technical problem as described above, the present invention, acrylic resin 5 to 15 parts by weight; 25 to 35 parts by weight of water-soluble polyurethane resin; Urethane-modified polycarbonate resin 8 to 15 parts by weight; 5 to 20 parts by weight of curing agent; 2 to 10 parts by weight of pigment; 3 to 10 parts by weight of heat transfer material; 10 to 30 parts by weight of a solvent; And 3 to 15 parts by weight of the heat exchange material, wherein the heat exchange material provides a spherical polymer material having a cavity structure and a spherical metal oxide layer formed on the surface of the polymer material.

In addition, the heat transfer material may include at least one selected from the group consisting of aluminum nitride, boron nitride and aluminum oxide, and the coating composition includes additives including a curing accelerator, antifoaming agent, slip agent, light stabilizer, and wetting agent. It may further include.

In addition, the present invention provides a method for forming a coating film characterized in that a coating film is formed using the coating composition described above.

The coating composition according to the present invention comprises all of the advantages of acrylic resin, urethane resin and polycarbonate resin by mixing water-soluble polyurethane resin and urethane-modified polycarbonate resin with acrylic resin, and thus has excellent coating properties such as adhesion and abrasion resistance. , Including heat-exchanging materials that can convert thermal energy into kinetic energy, the heat shielding and thermal insulation effect is excellent, so it is possible to reduce energy consumption for heating and cooling.

The coating composition is excellent in adhesion and can form a coating film on the surface of all structures such as buildings, roads, asphalt, playgrounds, tracks, and metal plates, and can prevent aging of buildings, roads, etc. by reducing deformation due to thermal expansion.

1 is a result of analyzing the heat exchange effect of the coating composition prepared by the method according to the embodiment, the control group and the reference example.

Hereinafter, the present invention will be described in detail.

The coating composition according to the present invention includes an acrylic resin, a water-soluble polyurethane resin, a urethane-modified polycarbonate resin, a curing agent, a water-soluble pigment, a solvent, a catalyst and a heat exchange material.

The acrylic resin improves the adhesion to the applied base surface, serves to improve the mechanical properties of the coating film, the bonding strength between resins, durability, and the like, and is manufactured using a material excellent in dryness and weather resistance, such as an acrylate monomer. Can be used.

The acrylic resin may be used without limitation as long as it is a transparent acrylic resin prepared using various conventional methods using monomers and initiators. As an example, the acrylic resin may be prepared by mixing a monomer, an initiator, and a polymerization agent with a solvent and polymerizing.

The monomer may be methyl acrylate containing a carboxyl group, methyl methacrylate, hydroxy ethyl methacrylate, cyclohexyl methacrylate, isobutyl methacrylate or a mixture thereof.

The initiator may use a radical initiator such as benzoyl peroxide or azobisisobutyronitrile, and the polymerization agent may be triethanol amine, dimethyl ethanol amine, di An amine-based polymerization agent such as ethanolamine or ammonia can be used.

The solvent is butyl cellosolve, ethyl cellosolve, 2-butoxyethanol, methanol, ethanol, isopropyl alcohol, n- Water-soluble organic solvents such as nbutanol, isobutanol, water, distilled water, and deionized water can be used, and water-soluble acrylic resins prepared by mixing and polymerizing the monomers, initiators, and polymerization agents with a solvent can be used. .

The acrylic resin is preferably included in the coating composition in a proportion of 5 to 15 parts by weight, and when the content of the acrylic resin is less than 5 parts by weight, the bonding strength between the compositions is low and the adhesion to the base surface is poor, resulting in poor formation of a coating film. A problem may occur, and when it exceeds 15 parts by weight, a problem may occur in that the coating film is hardened and the scratch resistance is weakened.

The water-soluble polyurethane resin reacts with a curing agent to improve durability and flexibility of the coating composition.

The water-soluble polyurethane resin may be prepared using a variety of conventional methods using a monomer and an initiator capable of producing a water-soluble polyurethane resin, and the water-soluble polyurethane resin may be used using a hydrophilic polyol and a curing agent. have.

In one example, the water-soluble polyurethane resin is 2 to 10 parts by weight of a hydrophilic polyol, 30 to 60 parts by weight of a polyester polyol, 5 to 30 parts by weight of an isocyanate curing agent, 5 to 25 parts by weight of a solvent, and polymerization A mixture prepared by reacting a mixture containing 1 to 5 parts by weight may be used.

The isocyanate-based curing agent used to prepare the water-soluble polyurethane resin is hexamethylene diisocyanate, isophorone diisocyanate, dicyclohexylmethane diisocyanate, toluene diisocyanate, or the like. The mixture may be a typical example, and is preferably used in a range of 5 to 30 parts by weight based on the total weight of the curing agent mixture.

If the content of the curing agent is less than 5% by weight, mechanical properties and chemical resistance may be deteriorated, and if the content exceeds 30% by weight, viscosity may be increased and difficult to synthesize.

The hydrophilic polyol serves to impart hydrophilicity to a urethane functional group to exhibit water solubility, and has an average number of functional groups of 2 or more, dimethyl propionic acid, dimethyl butanoic acid, polyoxyethylene Typical examples include glycols (polyoxyethylene glycol), polycaprolactone diol, polyether diol, polyoxyethylene or mixtures thereof.

And, the hydrophilic polyol is preferably configured to include in a proportion of 2 to 10 parts by weight relative to the total weight of the water-soluble polyurethane resin, there is a problem that the water solubility is reduced when the content of the hydrophilic polyol is less than 2 parts by weight, When it exceeds 10 parts by weight, there is a fear that the water resistance is lowered.

Particularly, the hydrophilic polyol is preferably a polyester diol-containing polyol compound having a weight average molecular weight (Mw) of 1000 to 5000, and thus a low molecular weight polyol is used to form a water-soluble polyurethane resin having excellent chemical resistance. can do.

The solvent is representative of acetone (acetone), methyl ethyl ketone (methylethylketone), dimethylformamide (dimethylformamide), glycol ether ester (glycoletherester), hydrogenated furan (hydrogenated furan), N-methylpyrrolidone (N-pyrrolidone), etc. For example, it is preferable to mix at a ratio of 5 to 25 parts by weight based on the total weight of the water-soluble polyurethane resin.

The polymerizing agent may be exemplified by N-methylethanol amine, triethanol amine, etc., and it is preferable to use triethanol amine, and 1 to 1 based on the total weight of the water-soluble polyurethane resin. It can be used by mixing in a proportion of 5 parts by weight. When the content of the polymerization agent is less than 1 part by weight, the polymerization effect is negligible, and when it is included to exceed 5 parts by weight, there may be a problem that causes odor and discoloration.

In particular, the polyester polyol used to prepare the polyurethane resin can be prepared by condensation reaction of an alcohol compound and an acid, and diethylene glycol and adipic acid are used as mothers. And 1,000 to 5,000 condensation reaction of an alcohol compound such as polyester or methylpropane diol and an acid such as adipic acid or isophthalic acid having a weight average molecular weight of 1,000 to 5,000. Polyester polyols having a weight average molecular weight of 5,000 can be used.

Preferably, the water-soluble polyurethane resin may be included in a proportion of 25 to 35 parts by weight, and when the content of the water-soluble polyurethane resin is less than 25 parts by weight, a problem that durability and flexibility of a coating film may be reduced, and 35 weight When the amount is exceeded, the viscosity may be excessively increased and a problem that it is difficult to secure workability may occur.

Since the urethane-modified polycarbonate resin has a long chain structure and a urethane bond in a molecular chain, it serves to improve the flexibility and scratch resistance of the coating film formed by the coating composition. The coating composition is preferably configured to include the urethane-modified polycarbonate resin in a proportion of 10 to 20 parts by weight. When the content of the urethane-modified polycarbonate resin is less than 8 parts by weight, scratch-resistance and paintability are deteriorated, and when the content of the urethane-modified polycarbonate resin exceeds 15 parts by weight, chemical resistance is deteriorated. Problems may arise.

In addition, the curing agent serves to produce a coating film of the coating by reacting with a hydroxyl group (-OH) of the resin to form a crosslinked structure, and such a curing agent may be used to induce a urethane reaction, and an isocyanate-based curing agent may be used. You can. In particular, curing agents included in the coating composition include hexamethylene diisocyanate, isophorone diisocyanate, dicyclohexylmethane diisocyanate, toluene diisocyanate, or mixtures thereof. Preferably, the curing agent is included in the range of 5 to 20 parts by weight. When the content of the curing agent is less than 5 parts by weight, it is difficult to secure physical properties of the coating film because curing does not easily occur, and when it exceeds 20 parts by weight, the content of the curing agent is excessive and the pot life is shortened, which may cause operational problems. .

The coating composition according to the present invention may be configured to include various types of pigments in order to impart color to the coatings. Preferably, the pigments are preferably inorganic pigments, titanium dioxide, calcium carbonate, talc, Inorganic pigments such as dolomite, silica, and alumina can be used.

The inorganic pigment may be included in a proportion of 2 to 10 parts by weight based on the total weight of the coating composition, and when the content of the pigment is less than 2 parts by weight, the content of the pigment is low, the viscosity is lowered, adhesion is lowered, and the color of the paint This may be non-uniform, and when it exceeds 10 parts by weight, the coating film becomes thick, and there is a problem in that the formation of pores is excessive and cracks are generated.

The coating composition according to the present invention may include a heat transfer material capable of inducing to promote the transfer of heat energy formed by exposure to sunlight to promote the conversion of heat energy by the heat exchange material, which will be described later, into kinetic energy.

The heat transfer material may be aluminum nitride particles, boron nitride particles, aluminum oxide particles or a mixture thereof, preferably, the coating composition according to the present invention may include the heat transfer material in a proportion of 3 to 10 parts by weight .

When the content of the heat transfer material is less than 3 parts by weight, the heat transfer effect is insignificant, and when it exceeds 10 parts by weight, a heat transfer effect may decrease rather.

The coating composition according to the present invention may include a solvent capable of uniformly dissolving the above-described subject matter and mixing, the solvent being ethyl acetate, propyl acetate, butyl acetate, ethylene glycol methyl ether, diethylene glycol methyl ether, Representative examples include butylene glycol methyl ether, dibutylene glycol methyl ester, propylene glycol methyl ether, dipropylene glycol methyl ether, or mixtures thereof.

Preferably, the solvent may be used in a range of 10 to 30 parts by weight based on the total amount of the composition relative to the coating composition, and when the content of the solvent is less than 10 parts by weight, adhesion is reduced and easily peeled off There is a problem that the surface leveling is lowered, and when it exceeds 30 parts by weight, there is a problem that the scratch resistance of the coating composition is reduced.

The coating composition according to the present invention includes a heat exchange material, and the heat exchange material has a structure including a spherical polymer material having a cavity structure and a spherical metal oxide layer formed on the surface of the polymer material.

The spherical polymer material is a spherical particle having a size of 0.1 to 50 μm in average diameter, and may be prepared by dispersion polymerization using an aromatic vinyl compound or an unsaturated carboxylic ester compound as a monomer.

The aromatic vinyl compound is styrene, a-methyl styrene, a-chloro styrene, p-tert-butyl styrene, p-methyl styrene, p-chloro styrene, o-chloro styrene, 2,5-dichloro styrene, 3,4- Dichloro styrene, dimethyl styrene and divinylbenzene or mixtures thereof are representative examples, and the unsaturated carboxylic ester compound is methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, propyl acrylate, Typical examples are propyl methacrylate, butyl acrylate, butyl methacrylate, or mixtures thereof.

The spherical metal oxide layer included in the heat exchange material absorbs infrared rays to easily accumulate thermal energy, and converts the accumulated thermal energy into kinetic energy to actively induce heat exchange.

The spherical metal oxide layer may include spherical metal oxide particles each containing tungsten (W), cesium (Cs), tin (Sn), and antimony (Sb) to absorb infrared rays, and the spherical metal as described above Metal oxide particles prepared by combining oxides in a specific ratio may be used. The spherical metal oxide particles can absorb infrared rays by maximally securing a positive hole capable of maximizing the activity of free electrons, and do not cause physical property changes in the coating composition because the bonding structure is stable.

In particular, the spherical metal oxide layer absorbs a large amount of infrared rays to accumulate thermal energy in a spherical polymer material included in a heat exchange material in a short time, and converts the accumulated thermal energy into kinetic energy that causes vibration of the spherical polymer material. It can induce insulation and heat shielding effects.

For example, the spherical metal oxide particles are 2 to 10 parts by weight of cesium oxide (Cs ₂ O) powder, antimony oxide (Sb ₂ O ₃ ) powder, and tin oxide (SnO) with respect to 100 parts by weight of tungsten oxide (WO ₃ ) powder. ₂ ) 0.1 to 1 part by weight of the powder is mixed to prepare a composite metal oxide powder, and 10 to 30 parts by weight of the prepared composite metal oxide powder is mixed with 100 parts by weight of an organic solvent such as alcohol, ketone or acetic acid, and then reacted after mixing. The prepared one may be used, and the metal oxide particles may be coated on the surface of the polymer material to form a heat exchange material.

In particular, the heat exchange material as described above may be included in a proportion of 3 to 15 parts by weight, and when the content of the heat exchange material is less than 3 parts by weight, the heat exchange effect is negligible, and when it exceeds 15 parts by weight, the heat exchange efficiency is rather reduced, and the coating film Problems that degrade the physical properties of the may occur.

In addition, the coating composition according to the present invention may further improve the physical properties of the coating composition and the coating film by further including additives such as a curing accelerator, an antifoaming agent, a slip agent, a light stabilizer, a wetting agent, and the like.

The curing accelerator can accelerate curing, and the curing accelerator is representative of trimethylenediamine, teryethylamine, organometallic catalyst (stannous octoate), dibutyltin dilaurate, 2-ethyl hexoic acid, etc. For example, preferably, the coating composition may include the curing accelerator in a ratio of 0.01 to 1 part by weight. When the content of the curing accelerator is less than 0.01 part by weight, the drying time is prolonged, and physical properties such as chemical resistance, moisture resistance, and abrasion resistance are deteriorated, and when it exceeds 1 part by weight, curing is rapidly promoted and popping occurs on the coating film during painting. This may occur or a problem that shrinkage of the coating film may occur.

The wetting agent can control the surface tension of the coating composition, ensure slip properties, coating properties, etc., and strongly lower the surface tension of the coating to improve wettability and to impart slip properties, polyether siloxane copolymer, poly It may be configured to further include a wetting agent comprising dimethylsiloxane, polyether-modified polydimethylsiloxane, and the like.

Preferably, the coating composition preferably contains a wetting agent in a range of 0.1 to 5 parts by weight relative to the total weight of the coating composition, and when the content of the wetting agent is less than 0.1 parts by weight, there is a problem in appearance defect due to dust on the painted surface. Occurs, and if it exceeds 5 parts by weight, there may be a problem that adhesion is deteriorated.

The light stabilizer has an effect of preventing aging, color change, etc. of a coating film caused by exposure to light for a long time, and performs ultraviolet ray blocking, light energy absorption and conversion, and free radical removal.

The photostabilizer may be used in various types such as benzophenone-based, oxaanilide-based, benzotriazole-based, triazine-based, 4-benzoyloxy-2,2,6,6-tetramethylbiperidine, 2,4-di -tert-butylphenyl-3,5-di-tert-butyl-hydroxybenzoide and the like can be used.

Preferably, the light stabilizer is preferably included in the range of 0.1 to 2 parts by weight based on the total weight of the coating composition, and when the content of the light stabilizer is less than 0.1 parts by weight, the coating film is easily yellowed and polished over time. There is a problem of deterioration, and if it exceeds 2 parts by weight, there is a problem that the paint storage is unstable.

The slip agent serves to further improve physical properties such as scratch resistance and contamination resistance of the surface of the coating film, and may be configured to further include a silicone-based slip agent such as polydimethyl silicone as the slip agent, preferably, It may be configured to contain the slip agent in the range of 0.1 to 3 parts by weight based on the weight of the coating composition. When the content of the slip agent is less than 0.1 parts by weight, physical properties such as abrasion resistance and scratch resistance are deteriorated, and if it exceeds 3 parts by weight, adhesion may be deteriorated.

The anti-foaming agent serves to prevent air bubbles that may be generated in the process of producing the coating composition, and the anti-foaming agent may be, for example, a silicone-based antifoaming agent or a non-silicone-based polymer antifoaming agent. Preferably, it can be configured to include in the range of 0.01 to 2 parts by weight with respect to the coating composition. When the content of the antifoaming agent is less than 0.01 parts by weight, the effect of removing bubbles is insufficient, and when it exceeds 2 parts by weight, there is a problem in that a cratering phenomenon occurs when forming a coating film.

In addition, according to a preferred embodiment of the present invention, the coating composition is 8 parts by weight of acrylic resin, 28 parts by weight of water-soluble polyurethane resin, 11 parts by weight of urethane-modified polycarbonate resin, 5 parts by weight of pigment, 0.4 parts by weight of slip agent, 0.1 parts by weight of antifoaming agent, 1.5 parts by weight of light stabilizer, 5 parts by weight of aluminum nitride powder, 9 parts by weight of heat exchange material, propylene glycol methyl ether, 25 parts by weight of water-containing solvent, 6.5 parts by weight of curing agent, and 0.5 parts by weight of curing accelerator It is preferred to manufacture.

The coating composition according to the present invention as described above is mixed with a water-soluble polyurethane resin and a urethane-modified polycarbonate resin to the acrylic resin to include all the advantages of acrylic resin, urethane resin and polycarbonate resin, such as adhesion, abrasion resistance coating film It has excellent properties, and includes heat-exchanging materials that can convert heat energy into kinetic energy. The heat shielding effect and the heat insulation effect are excellent, and energy consumption can be reduced.

The coating composition is excellent in adhesion, so it is possible to form a coating film on the surface of all structures, such as buildings, roads, asphalt, playgrounds, tracks, and metal plates, and reduce deformation due to thermal expansion to prevent aging of buildings, roads, and the like.

In addition, the present invention provides a method for forming a coating film, characterized in that a coating film is formed by applying the coating composition described above.

The coating composition is preferably applied one or more times to form a coating film on a wall surface, a floor surface, etc., and is coated with a coating amount of 0.2 to 0.5 kg / m ^{2 to form} a coating film having excellent physical properties on surfaces such as a wall surface or a floor surface. have.

Hereinafter, the present invention will be described in more detail with reference to examples.

The examples presented are only specific examples of the invention and are not intended to limit the scope of the invention.

<Example>

8 parts by weight of acrylic resin, 28 parts by weight of water-soluble polyurethane resin, 11 parts by weight of urethane-modified polycarbonate resin, 5 parts by weight of pigment, 0.4 parts by weight of slip agent, 0.1 parts by weight of antifoaming agent, 1.5 parts by weight of light stabilizer, 5 parts of aluminum nitride powder Part, 9 parts by weight of a spherical heat exchange material, propylene glycol methyl ether, 25 parts by weight of a solvent containing water, 6.5 parts by weight of a curing agent and 0.5 parts by weight of a curing accelerator were mixed and continuously stirred to prepare a water-soluble paint.

<Experimental Example 1> Evaluation of physical properties of coating film

The prepared water-soluble coating was coated with a thickness of 20 to 40 μm on the bottom surface of the sample and dried at room temperature for approximately 2 hours to form a coating film of 40 to 50 μm thickness. Thereafter, the properties of the formed coating film were evaluated, and the difference between the properties of the examples and the reference examples was compared using a commercially available heat exchange coating (M-47 Changecoat, Megamexim) as a reference example. To evaluate the physical properties, the wear resistance of the coating film was analyzed by rotating the coating film 1,000 times with a polishing wheel (CS-17) using a Taber type abrasion tester, and the scratch resistance of the coating film was analyzed using a scratch hardness tester, and a dry adhesion tester was used. The adhesive strength was analyzed and evaluated, and the results are shown in Table 1 below.

As shown in Table 1, it was confirmed that the prepared heat exchange coating material has excellent abrasion resistance and adhesive strength compared to a commercially available coating material, and thus has excellent physical properties of the coating film.

In addition, as a result of measuring the pot life of the prepared water-soluble paint, it was confirmed that a pot life of 30 to 90 minutes was required, and it was confirmed that the working time of the worker could be increased.

<Experimental Example 2> Analysis of heat exchange effect of heat exchange paint

The prepared water-soluble paint was applied to the surface of the asphalt with a roller brush, and the heat exchange effect of the heat exchange paint prepared by measuring the surface temperature at a specific time for 3 days was analyzed, and the results are shown in FIGS. 1 and 2. In this case, the heat exchange effect of the coating composition according to the example was analyzed by referring to the case where the temperature (control) of the untreated asphalt surface and the commercially available heat exchange paint were applied by roller brush coating in the same way.

As shown in Figure 1 and Table 2, it was confirmed that the temperature of the asphalt coated with Examples and Reference Examples was lower than the temperature of the asphalt surface, and the physical properties of the water-soluble paint according to the Examples were remarkably excellent in the time of strong sunlight. The effect was confirmed. It was determined that such an excellent effect is induced by the heat transfer material and the heat exchange material included in the coating composition according to the embodiment.

Claims (4)

5 to 15 parts by weight of an acrylic resin; 25 to 35 parts by weight of water-soluble polyurethane resin; Urethane-modified polycarbonate resin 8 to 15 parts by weight; 5 to 20 parts by weight of curing agent; 2 to 10 parts by weight of pigment; 3 to 10 parts by weight of heat transfer material; 10 to 30 parts by weight of a solvent; And 3 to 15 parts by weight of the heat exchange material,
The heat exchange material includes a spherical polymer material having a cavity structure and a spherical metal oxide layer formed on the surface of the polymer material,
The spherical metal oxide layer,
100 to 1 part by weight of tungsten oxide (WO ₃ ) powder, 2 to 10 parts by weight of cesium oxide (Cs ₂ O) powder, 0.1 to 1 part by weight of antimony oxide (Sb ₂ O ₃ ) powder and tin oxide (SnO ₂ ) powder Characterized in that formed by mixing 10 to 30 parts by weight of the composite metal oxide powder to 100 parts by weight of an organic solvent and then coating the surface of the spherical polymer material,
The heat transfer material is a coating composition characterized in that it comprises at least one member selected from the group consisting of aluminum nitride, boron nitride and aluminum oxide. delete According to claim 1,
A coating composition comprising a curing accelerator, an antifoaming agent, a slip agent, a light stabilizer, and an additive including a wetting agent. A method for forming a coating film comprising forming a coating film using the coating composition according to any one of claims 1 and 3.

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