Coating film and air conditioner equipped with the same

Abstract

A coating film according to one embodiment of the present disclosure is characterized by being provided with a first layer that is formed on a base material and a second layer that is formed on the first layer, while being also characterized in that: the first layer contains spherical resin particles, an organic resin agent and an antiviral agent; the second layer contains inorganic particles, fluororesin particles, an antifungal and antimicrobial agent, and an antiviral agent; and the first layer has a contact angle with water of not less than 60 degrees but less than 110 degrees. Consequently, the present disclosure is able to provide: a coating film which has dust adhesion suppressing properties, antifungal properties and antiviral properties for a long period of time; and an air conditioner which is provided with this coating film.

Description

Technical Field

[0001] The present disclosure relates to a coating film and an air conditioner provided with the same.

Background Art

[0002] The surfaces of various products are exposed to various contaminants from their environment, which may make them look dirty, cause hygienic problems, or lead to performance degradation due to corrosion or the like. Among them, air conditioners are very susceptible to the effects of environmental pollution due to their functions and are likely to cause various inconveniences due to pollution. Since various types of dirt such as dust, oil fumes, and tobacco tar adhere to the surfaces of various articles used indoors or outdoors, various methods for suppressing this have been studied. For example, when suppressing the adhesion of dirt such as dust, it is known that the electrostatic adhesion of dust can be suppressed by coating an antistatic agent on the surfaces of various articles. Also, when suppressing the adhesion of lipophilic dirt such as oil fumes, it is known that coating an oil-repellent fluororesin on the surfaces of various articles can make it easier to remove lipophilic dirt. Furthermore, several methods have been disclosed so far for technologies that impart antiviral performance against the novel coronavirus.

[0003] There has been proposed an antiviral agent which is an inorganic solid acid having an acid point concentration exceeding 0.005 mmol / g and being 10 mmol / g or less, and having an acid strength (pKa) of the acid point of 3.3 or less, and which is any one or more of inorganic solid acids selected from inorganic phosphate compounds, inorganic silicate compounds, or inorganic oxides, and an antiviral coating composition characterized by containing the antiviral agent (for example, Patent Document 1).

[0004] In addition, it is composed of at least one of copper particles and copper compound particles supported on oxide particles. The total supported amount of the copper particles and copper compound particles is 0.1 to 10 parts by mass with respect to 100 parts by mass of the oxide particles, and the average secondary particle diameter is 80 nm to 600 nm. It has copper-supported oxide, barium sulfate with an average secondary particle diameter of 1 μm to 15 μm, and a water-repellent resin binder for dispersing the copper-supported oxide and barium sulfate. The specific gravity of the copper-supported oxide is 40 to 90% with respect to the specific gravity of the barium sulfate. With respect to 100 parts by mass of the resin binder, the copper-supported oxide is 0.1 to 10 parts by mass, and the barium sulfate is 10 to 45 parts by mass. An antiviral coating film has been proposed, characterized in that the coating film thickness is 1 to 2 μm thicker than the average secondary particle diameter of the barium sulfate (for example, Patent Document 2).

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, in Patent Document 1, since it contains any one or more antiviral agents of inorganic solid acids selected from inorganic phosphate compounds, inorganic silicate compounds, or inorganic oxides, although it shows a certain antiviral performance initially, it has no effect of suppressing dust adhesion and is difficult to apply to air conditioners and the like. In Patent Document 2, since an antiviral component is dispersed in the binder resin, although it has a certain effect of long-term durability on antiviral performance, it is not sufficient in an environment such as an air conditioner, and the effect of suppressing dust adhesion is poor.

[0007] The present disclosure has been made to solve the above problems, and an object thereof is to provide a coating film having long-term dust adhesion suppression performance, antifungal performance, and antiviral performance, and an air conditioner including the same.

Means for Solving the Problems

[0008] The coating film according to the present disclosure includes a first layer formed on a substrate and a second layer formed on the first layer. The first layer contains spherical resin particles, an organic resin agent, and an antiviral agent. The second layer contains inorganic particles, fluororesin particles, an antifungal and antibacterial agent, and an antiviral agent. Further, the water contact angle of the first layer is 60 degrees or more and less than 110 degrees. Part of the surface of the fluororesin particles is exposed from the surface of the second layer and is scattered on the surface of the second layer This is a feature thereof.

Effects of the Invention

[0009] According to the present disclosure, it is possible to provide a coating film having long-term dust adhesion suppression performance, antifungal performance, and antiviral performance, and an air conditioner including the same.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Modes for Carrying Out the Invention

[0011] Hereinafter, a coating film having antiviral performance and a method for manufacturing the coating film will be described with reference to the drawings and the like. In the following drawings including FIG. 1, the relative dimensional relationships and shapes of the respective constituent members may be different from the actual ones. Also, in the following drawings, those with the same reference numerals are the same or corresponding ones, and this shall be common throughout the entire specification. And the forms of the constituent elements represented throughout the entire specification are merely examples and are not limited to the forms described in the specification. Further, terms indicating directions (for example, "up", "down", "right", "left", "front", and "rear", etc.) are appropriately used for ease of understanding, but their notations are only described in this way for convenience of explanation and do not limit the arrangement and orientation of the device or parts.

[0012] Embodiment 1. FIG. 1 is a schematic diagram of the coating film according to Embodiment 1. The coating film 1 according to Embodiment 1 is composed of a first layer 3 on the surface of a substrate 2 and a second layer 4 formed on the first layer 3. The first layer 3 includes spherical resin particles 10, an organic resin agent 5, and an antiviral agent 6. Also, the second layer 4 includes inorganic particles 7, fluororesin particles 8, a fungicidal and antibacterial agent 9, and an antiviral agent 6.

[0013] The first layer 3 is formed by applying a liquid coating composition containing spherical resin particles 10, an organic resin agent 5, and an antiviral agent 6 to a substrate 2 and drying it. Since the spherical resin particles 10 are dispersed without aggregating in the liquid, they are also dispersed and present in the first layer 3 after drying, and a part of the surface of the spherical resin particles 10 is dotted and exposed on the surface of the first layer 3. Further, the second layer 4 is formed by applying a liquid coating composition containing inorganic particles 7, fluororesin particles 8, a fungicidal and antibacterial agent 9, and an antiviral agent 6 onto the first layer 3 and drying it. When forming the second layer 4 on the first layer 3, a structure is formed in which the spherical resin particles 10 and the fluororesin particles 8 exposed on the surface of the first layer 3 are adjacent to each other. In order to form a structure in which the spherical resin particles 10 and the fluororesin particles 8 are adjacent to each other, the fluororesin particles 8 are dispersed and present in the second layer 4 without aggregating, and a state is formed in which a part of the surface of the fluororesin particles 8 is exposed on the surface of the second layer 4. Further, the first layer 3 has the effect of enhancing the adhesion to the second layer 4. Therefore, it is suitable for application to parts such as air conditioners that require long-term suppression of dust adhesion.

[0014] In the second layer 4, by realizing a configuration in which the fluororesin particles 8 are dispersed and dotted on the outermost surface, a surface in which a hydrophilic part and a hydrophobic part coexist can be obtained in a minute region related to the adhesion of pollutant particles in the air. The inorganic particles 7 have an effect of suppressing the adhesion of hydrophobic dust. The fluororesin particles 8 have an effect of suppressing the adhesion of hydrophilic dust. In a minute region related to the adhesion of pollutant particles in the air, a surface having a configuration in which a hydrophilic part and a hydrophobic part coexist facilitates the movement of surface moisture during moisture absorption and drying, and also has the effect of floating and releasing hydrophilic and hydrophobic particles attached to the surface or making them difficult to adhere. Also, during dew condensation, compared to a surface composed of only one of the hydrophilic part or the hydrophobic part when viewed in a minute region related to the adhesion of pollutant particles in the air, water flows easily and penetrates easily, so there is also an effect that the attached substances are very easily removed.

[0015] The base material 2 is not particularly limited, and examples include parts made of metal materials and plastic materials. In particular, members that are prone to soiling due to the mixed presence of oil-based and water-based dirt, are difficult to clean frequently, such as members like the heat exchanger, fan, and flap of an air conditioner, are suitable. Further, the coating composition according to the present embodiment can impart an effect of suppressing dust adhesion to a base material having minute grooves and minute irregularities on the surface, such as an acrylic-styrene-glass fiber (hereinafter abbreviated as ASG) resin.

[0016] [First layer] The spherical resin particles 10 of the first layer 3 are not particularly limited, and acrylic resin particles, silicone resin particles, nylon resin particles, styrene resin particles, polyethylene resin particles, benzoguanamine resin particles, phenol resin particles, or urethane resin particles, etc. can be used. It is preferable to use acrylic resin particles or silicone resin particles as the spherical resin particles 10, and more preferably silicone resin particles. Further, examples of the spherical resin particles 10 as organic spherical particles include true spherical polyamide fine particles manufactured by Sumitomo Chemical Co., Ltd., true spherical phenol resin manufactured by Gunei Chemical Industry Co., Ltd., Micropearl manufactured by Sekisui Chemical Co., Ltd., or Tospearl manufactured by Momentive, etc.

[0017] The water contact angle of the first layer 3 is preferably 60 degrees or more and less than 110 degrees. If the water contact angle of the first layer 3 is less than 60 degrees, the fluororesin particles 8 forming the second layer 4 are not well dispersed, which is not preferable. If the water contact angle is 110 degrees or more, the coatability of the coating agent when forming the second layer 4 deteriorates, and defects are likely to occur in the film, which is not preferable. The average particle diameter of the spherical resin particles 10 is preferably 0.5 μm or more and 15.0 μm or less, and excellent dust adhesion suppression can be obtained. If the average particle diameter of the spherical resin particles 10 is less than 0.5 μm, the fluororesin forming the second layer 4 is not well dispersed, which is not preferable. On the other hand, if the average particle diameter of the spherical resin particles 10 exceeds 15.0 μm, the irregularities of the second layer 4 become large, and dust is likely to get caught, which is not preferable.

[0018] The content of the spherical resin particles 10 according to the present disclosure is preferably 0.1% by mass or more and 10.0% by mass or less with respect to the whole of the first layer 3. If it is less than 0.1% by mass, the fluororesin particles 8 are not favorably dispersed, which is not preferable. If it exceeds 10.0% by mass, the unevenness of the second layer 4 becomes large and dust is likely to be caught, which is not preferable.

[0019] Further, the ratio S / L of the shortest diameter S to the longest diameter L of the spherical resin particles 10 is preferably 0.7 or more, more preferably 0.8 or more, and particularly preferably 0.9 or more. If it is less than 0.7, the fluororesin particles 8 forming the second layer 4 are not favorably dispersed, which is not preferable.

[0020] The organic resin agent 5 includes epoxy resin, polyester resin, melamine resin, ethylene-vinyl acetate copolymer, polyvinyl butyral, styrene resin, polyester urethane, acrylic urethane, polyamide, polyester resin, or acrylic resin, etc. The acrylic resin is a polymer having structural units derived from (meth)acrylic acid, (meth)acrylic acid ester, etc. The acrylic resin may contain a crosslinked structure, and the crosslinked structure is formed from a monomer having a crosslinkable functional group. Examples of the crosslinkable functional group include an isocyanate group, an oxazoline group, a methylene group, a carbodiimide group, or an aziridine group, etc. Also, the crosslinked structure may be formed from melamine or the like. As the resin composition containing the acrylic resin, it may be appropriately selected from commercially available products capable of forming an adhesive resin layer. For example, the Boncoat series manufactured by DIC Corporation, or the TOP series manufactured by Nippon Parkerizing Co., Ltd., etc. can be mentioned. The epoxy resin is a polymer composed of structural units derived from a monomer having an epoxy group in the molecule. The epoxy resin may contain a crosslinked structure, and the above-mentioned crosslinked structure is formed from a monomer having a crosslinkable functional group. As the resin composition containing the epoxy resin, it may be appropriately selected from commercially available products capable of forming an adhesive resin layer. For example, EPICRON manufactured by DIC Corporation can be mentioned. Also, as the resin composition containing the epoxy resin, it may be included alone or in combination of two or more kinds.

[0021] As the antiviral agent 6, inorganic or organic materials can be used. As the inorganic antiviral agent 6, metal oxide or metal hydrate particles containing at least one metal selected from silver, copper, zinc, titanium, tungsten, etc. can also be used. For example, aluminum(III) oxide supported with at least one of copper(I) oxide, copper(II) oxide, copper(II) carbonate, copper(II) hydroxide, copper(II) chloride, silver nanoparticles and copper nanoparticles, silicon dioxide supported with at least one of silver nanoparticles and copper nanoparticles, zinc oxide supported with at least one of silver nanoparticles and copper nanoparticles, titanium oxide supported with at least one of silver nanoparticles and copper nanoparticles, or calcium phosphate supported with at least one of tungsten oxide, silver nanoparticles and copper nanoparticles, etc. can be mentioned. Examples include the silver-based inorganic additive (EX20706D) of Shinanezeomic Co., Ltd., or the silver-based inorganic additive (EX20706B) of Taihei Chemical Industry Co., Ltd. Zeolite exchanged with at least one of silver ions and copper ions may be further exchanged with other metal ions such as zinc ions. Furthermore, examples include lanthanum molybdenum oxide-based inorganic filler La2Mo2O9 (LMO). Here, the silver nanoparticles refer to silver nanoparticles containing silver particles with a diameter of about 1 to 100 nm, and the copper nanoparticles refer to copper nanoparticles containing copper particles with a diameter of about 1 to 100 nm.

[0022] As the organic antiviral agent 6, it is desirable that it is at least one selected from the group consisting of an antimicrobial resin, a sulfonic acid surfactant, a copper alkoxide, and a bis-type quaternary ammonium salt. When the organic antiviral agent 6 is at least one selected from the group consisting of an antimicrobial resin, a sulfonic acid surfactant, a sulfonic acid-containing polymer, a bis-type quaternary ammonium salt, and a multi-block polymer, the organic antiviral agent 6 spreads throughout the coating film and becomes an antimicrobial member having high antimicrobial activity. Examples of the organic antiviral agent 6 include 2-4 thiazolyl benzimidazole methyl 3-benzimidazole carbamate as a benzimidazole type, and polyoxyethylene (dimethylimino) ethylene (dimethylimino) ethylene chloride, octadecyl dimethyl (3-triethoxysilylpropyl) ammonium chloride, benzalkonium chloride, benzethonium chloride, or dialkyldimethylammonium chloride as a quaternary ammonium salt.

[0023] The film thickness of the first layer 3 is preferably 1.0 μm or more and 10.0 μm or less, and the second layer 4 is preferably 0.1 μm or more and 5.0 μm or less. More preferably, the film thickness of the first layer is 2.0 μm or more and 8.0 μm or less. By the film thickness of the first layer being 2.0 μm or more and 8.0 μm or less, excellent antiviral properties and long-term durability can be exhibited. More preferably, the film thickness of the second layer 4 is 0.2 μm or more and 4.5 μm or less. By the film thickness of the second layer 4 being 0.2 μm or more and 4.5 μm or less, excellent antiviral properties and dust adhesion suppression performance can be exhibited. The film thickness of the first layer 3 can be adjusted by the concentration of the composition used for film formation, the selection of the bar coater No. used for film formation, etc. Also, the film thickness can be measured by fluorescent X-ray, infrared film thickness meter, or mass measurement by coating film peeling. Note that the film thickness of the first layer 3 refers to the thickness formed by the organic resin agent 5, and the film thickness of the second layer 4 refers to the thickness including the inorganic particles 7, the antiviral agent 6, the fluororesin particles 8, and the antifungal antibacterial agent 9.

[0024] [Second layer] The inorganic particles 7 that form the second layer 4 are characterized by being at least one selected from SiO2, Al2O3, Sb2O5, ZrO2, TiO2, Fe2O3, CeO2, AgO, CuO, Cu2O, ZnO, and composite oxides or mixtures thereof. The inorganic particles 7 of the present disclosure are preferably hydrophilic silica particles and titanium particles. The effect can be further enhanced by the inorganic particles 7 being spherical particles.

[0025] When the average particle size of the silica particles is measured by the light scattering method, the average particle size is preferably 5 nm or more and about 100 nm or less. In particular, for silica particles in the range of 5 nm or more and 100 nm or less, for one silica particle, the surface portion corresponding to approximately 15 to 30% of the weight of the silica particle is in a state of being half dissolved in water. For silica particles with an average particle size of less than 5 nm, the proportion of the silica component in the state of being half dissolved in water becomes too high, and the silica particles aggregate with each other. For silica particles with an average particle size of 100 nm or less, the scattering of light reflected by the coating film becomes small, so the transparency of the coating film is improved, changes in the color tone and texture of the substrate are suppressed, and the color tone and texture of the substrate can be prevented from being impaired. Further, by using silica particles with an average particle size of 5 nm or more and 100 nm or less as the inorganic particles 7, the silica component in the obtained coating film has fine voids between the silica particles while being dense. Due to the denseness, the film thickness can be reduced, and due to the voids, the intermolecular force with the particles that cause contamination, that is, the adhesion force with the particles, becomes small, so there is an effect of making it difficult to adhere.

[0026] The fluororesin particles 8 used in this embodiment are not particularly limited as long as they are dispersed in an aqueous medium. Specific examples of the fluororesin particles include at least one selected from PTFE (polytetrafluoroethylene), FEP (tetrafluoroethylene - hexafluoropropylene copolymer), PFA (tetrafluoroethylene - perfluoroalkyl vinyl ether copolymer), ETFE (ethylene - tetrafluoroethylene copolymer), ECTFE (ethylene - chlorotrifluoroethylene copolymer), PVDF (polyvinylidene fluoride), PCTFE (polychlorotrifluoroethylene), PVF (polyvinyl fluoride), copolymers or mixtures thereof. Other resin particles may be mixed with the above fluororesin particles. It is also possible to use those having a form of a dispersion stably dispersed in an aqueous medium due to the effect of a surfactant or a hydrophilic group contained in the polymer.

[0027] When the average particle diameter of the fluororesin particles 8 is measured by the light scattering method, it is preferably 50 nm or more and 500 nm or less, and more preferably 100 nm or more and 250 nm or less. The fluororesin particles 8 having such an average particle diameter are easily dispersed in the coating composition and are sufficiently large with respect to the inorganic particles, so that they are likely to be exposed on the surface of the coating film. When the average particle diameter exceeds 500 nm, the area of the fluororesin particles exposed on the surface of the coating film may become too large, making it easy for hydrophobic contaminants to adhere, or the unevenness of the coating film may become large, making it easy for contaminants to adhere firmly. On the other hand, when the average particle diameter of the fluororesin particles is less than 50 nm, the fluororesin particles 8 may be less likely to be exposed on the surface of the coating film.

[0028] The fungicide 9 is a compound selected from the group consisting of an organic iodine compound, an isothiazoline compound, and an alanine compound, and any compound that is easily soluble in water may be used. When a water-soluble fungicide is blended, the fungicide component dissolves in the aqueous medium, and when a coating film is formed, the fungicide component is dispersed over the entire surface. Specific examples of the organic iodine compound include 3-iodo-2-propynyl butylcarbamate, diiodomethyl-p-tolylsulfone, p-chlorophenyl-3-iodopropargyl formal, and the like. Specific examples of the isothiazoline compound include 5-chloro-2-methyl-4-isothiazolin-3-one, 2-methyl-4-isothiazolin-3-one, 2-n-octyl-4-isothiazolin-3-one, 4,5-dichloro-2-n-octyl-4-isothiazolin-3-one, 2-methyl-4,5-trimethylene-4-isothiazolin-3-one, 1,2-benzisothiazolin-3-one, n-butyl-benzisothiazolin-3-one, and the like. Specific examples of the alanine compound include N-lauryl-β-alanine and the like. The organic iodine compound, the isothiazoline compound, and the alanine compound may be used alone or in combination of two or more. The water-dispersible fungicide particles used in the present disclosure are compounds selected from the group consisting of an imidazole compound, a triazole compound, a pyrithione compound, a thiazole compound, and a thiophene compound, and any compound that can be dispersed in an aqueous medium may be used. It is preferable that the water solubility of these water-dispersible fungicide particles at 20°C is 0.5 mg / L or less. If the solubility exceeds 0.5 mg / L, the effect will be limited in an environment where there is a large amount of water, such as water-related parts. Specific examples of the imidazole compound include methyl 2-benzimidazolecarbamate, methyl 1-(butylcarbamoyl)-2-benzimidazolecarbamate, thiabendazole, and the like. Specific examples of the triazole compound include 2-(4-chlorophenyl)-3-cyclopropyl-1-(1H-1,2,4-triazol-1-yl)-butan-2-ol, 4,4-dimethyl-3-(1H-1,2,4-triazol-1-ylmethyl)pentan-3-ol, and the like.Specific examples of the pyrithione compounds include zinc pyrithione, sodium pyrithione, and the like. Specific examples of the thiazole compounds include 2-(4-thiocyanomethylthio)benzothiazole, and the like. Specific examples of the thiophene compounds include 3,3,4-trichlorotetrahydrothiophene-1,1-dioxide, 3,3,4,4-tetrachlorotetrahydrothiophene-1,1-dioxide, such as 3,3,4,4-tetrachlorotetrahydrothiophene-1,1-dioxide, and the like. These compounds may be used alone or in combination of two or more.

[0029] The content of the antifungal and antibacterial agent 9 is 0.1% by mass or more and 25.0% by mass or less, preferably 1.0% by mass or more and 15.0% by mass or less, based on the total mass of the inorganic particles and the hydrophobic resin particles. If the content is less than 0.1% by mass, the effect of suppressing mold cannot be sufficiently obtained. On the other hand, if the content exceeds 25.0% by mass, the unevenness of the coating film becomes too large and dirt easily adheres, and mold germination occurs from the dirt.

[0030] Also, the average particle size of the antifungal and antibacterial agent 9 is preferably 0.1 μm or more and 3.0 μm or less. If the average particle size is less than 0.1 μm, the effect of suppressing the growth of hyphae germinated from spores adhering to the surface of the coating film is poor. On the other hand, if the average particle size exceeds 3.0 μm, the unevenness of the coating film becomes too large and dirt easily adheres, and mold germination occurs from the dirt. The average particle size of the water-dispersible antifungal agent particles used in the present disclosure is a value measured by ELSZ-2 manufactured by Otsuka Electronics Co., Ltd.

[0031] The antiviral agent 6 can be implemented in the same manner as described in the first layer 3.

[0032] As described above, the coating film including the first layer formed on the substrate and the second layer formed on the first layer shown in the first embodiment has the following effects: the first layer contains spherical resin particles, an organic resin agent, and an antiviral agent; the second layer contains inorganic particles, fluororesin particles, a fungicidal and antibacterial agent, and an antiviral agent; and the water contact angle of the first layer is 60 degrees or more and less than 110 degrees, so that the coating film exhibits excellent dust adhesion suppression performance, fungicidal performance, and antiviral performance over a long period of time.

[0033] Embodiment 2. Embodiment 2 relates to a manufacturing process for forming the coating film 1 on the substrate 2. The manufacturing process for forming the coating film 1 on the substrate 2 shown in this embodiment 2 includes a step of preparing coating compositions for forming the first layer 3 and the second layer 4 respectively, a first step of forming the first layer 3 on the substrate 2, and a second step of forming the second layer 4 on the first layer 3. The coating composition is an aqueous composition containing water as a medium. As a method for applying the coating agent of the first layer 3 in the first step to the substrate 2, for example, a method using a commonly used coating device such as a bar coater, a roll coater, or a flow coater can be mentioned. Also, the application amount of the composition may be appropriately selected according to the thickness of the target layer and the like.

[0034] As a method for applying in the second step, for example, a method using a commonly used coating device such as a bar coater, a roll coater, or a flow coater can be mentioned. The addition amount of the inorganic particles 7 to the coating composition in the second step is preferably 0.01% by mass or more and 5.0% by mass or less, and more preferably 0.02% by mass or more and 4.0% by mass or less. If it is less than 0.01% by mass, the inorganic particles 7 are too sparse to form the matrix of the hydrophilic layer film, and sufficient dust adhesion suppression cannot be obtained. If it exceeds 5.0% by mass, the matrix of the hydrophilic layer film becomes too thick, and cracks are likely to occur, which is not preferable. Also, bad odors are likely to occur, which is not preferable.

[0035] The content of the fluororesin particles 8 is preferably 0.01% by mass or more and 5.0% by mass or less with respect to the coating composition. By having the content of the fluororesin particles 8 be at a predetermined value or more, excellent antifouling properties can be exhibited. If the content of the fluororesin particles 8 exceeds the predetermined value, the hydrophobicity based on the fluororesin particles 8 becomes too high, and the hydrophilicity decreases. Also, there are many irregularities, and dust may get caught, which is not preferable. By the method described above, a coating film 1 having dust adhesion suppression can be formed on the surface of the base material 2.

[0036] The formation of the coating film 1 on the base material 2 is carried out through a step of applying the coating composition to the base material 2 and a step of drying. When forming the coating film 1, after forming the first layer 3, the second layer 4 is formed. Note that, as the formation methods of the first layer 3 and the second layer 4, the coating methods and drying methods shown below can be arbitrarily applied. The coating composition can be applied by spraying, roller, or dipping, and can be processed by natural drying at normal temperature. By promoting the reaction by hot air or oven heating, a stronger coating film can be obtained. In this case, the heating is preferably 40°C or more and 250°C or less. If it is less than 40°C, the heating only has the effect of promoting drying. At a temperature exceeding 250°C, cracks or the like may occur due to thermal deterioration of the coating film 1, which is not preferable. Also, there is a method of increasing the dipping time of the coating composition or the spraying time of the spray. By setting the contact time to 10 seconds or more, preferably 30 seconds or more, by this method, a sufficient coating film 1 can be formed. If it is less than 10 seconds, there is no difference from normal coating. If it exceeds 30 seconds, there is a problem that there is almost no change in the effect even if the time is extended, and only the required time becomes longer, which is not preferable. As another method, there is also a method of raising the temperature of the coating liquid or the object to be coated. By setting this temperature to 30°C or more and 60°C or less, a sufficient reaction can easily proceed. If it is less than 30°C, the heating effect is too small. At a temperature exceeding 60°C, the evaporation of the coating liquid is intense, and since drying becomes faster, it is difficult to perform uniform coating, which is not preferable.

[0037] Embodiment 3. FIG. 2 is a schematic cross-sectional view of an indoor unit 100 of an air conditioner according to Embodiment 3. The indoor unit 100 includes an indoor unit main body 110 which is a frame of the air conditioner, and as an example of components constituting the indoor unit 100, a drain pan 113, a drain pan 114, a blower fan 115, an air duct wall 116, a heat exchanger 117, a heat exchanger 118, a heat exchanger 119, an up-and-down air direction variable vane 120, and a front panel 121 are shown. Note that components having the same functions and actions as the coating film 1 according to Embodiment 1 are denoted by the same reference numerals and their descriptions are omitted.

[0038] A front panel 121 is attached to the front of the indoor unit main body 110 so as to be openable and closable. An intake port 111 for sucking air from the room where the indoor unit 100 of the air conditioner is installed is formed on the upper surface side of the indoor unit main body 110. An air outlet 112 for blowing air into the room is formed on the lower surface side of the indoor unit main body 110. An up-and-down air direction variable vane 120 is rotatably attached to the air outlet 112. The up-and-down air direction variable vane 120 adjusts the up-and-down direction of the airflow blown out from the air outlet 112.

[0039] The blower fan 115 is installed inside the indoor unit main body 110. The blower fan 115 sucks air into the indoor unit main body 110 and blows out the sucked air to the outside of the indoor unit main body 110. In the present embodiment, the blower fan 115 is a cross-flow fan.

[0040] The heat exchanger 117, the heat exchanger 118, and the heat exchanger 119 are arranged inside the indoor unit main body 110. The heat exchanger 117 is arranged at the upper part on the back side of the blower fan 115, the heat exchanger 118 is arranged at the upper part on the front side of the blower fan 115, and the heat exchanger 119 is arranged on the front side of the blower fan 115. That is, the heat exchanger 119 is located below the heat exchanger 118, and the heat exchanger 117 is located behind the heat exchanger 118.

[0041] Below the heat exchanger 119, a drain pan 113 for collecting condensed water is arranged. Below the heat exchanger 117, a drain pan 114 is also arranged. The drain pan 113 and the drain pan 114 are formed as part of the indoor unit main body 110.

[0042] A coating film 1 is formed on at least a part of the surfaces of the blower fan 115, the air duct wall 116, and the drain pan 113. The coating film 1 may be formed on all of the surface of the drain pan 113. Also, the coating film 1 may be formed on at least a part of the surface of the drain pan 114. All of the drain pan 114 may be formed by the coating film 1. In other words, the drain pan 113 and the drain pan 114 have the coating film 1 described in Embodiment 1 on at least one surface of the drain pan 113 and the drain pan 114. Note that the method for forming the coating film 1 is the same as that described in Embodiment 2.

[0043] The formed coating film 1 has the performance of suppressing dust adhesion, long-term antiviral performance, and antifungal performance, and thus is suitable for use in various members of the air conditioner. In particular, it is preferable that the coating film 1 is formed on both the blower fan 115, the air duct wall 116, the drain pan 113, and the drain pan 114. Therefore, the air conditioner according to Embodiment 3 having various members on which the coating film 1 is formed has the performance of suppressing dust adhesion, antifungal performance, and antiviral performance over a long period of time.

Example

[0044] Hereinafter, the details of the present disclosure will be described by way of examples and comparative examples, but the content of the present disclosure is not limited thereby. As the substrate, a polystyrene (PS) resin plate with a thickness of 1 mm was used in all cases.

[0045] <Example 1> As a coating composition constituting the first layer, 1.0% by mass of spherical resin particles (TOSPEAL R130 manufactured by Momentive), 2.0% by mass of an organic resin agent (polyurethane aqueous dispersion manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd.), and 0.5% by mass of an antiviral agent (neosinthol AV-18F manufactured by Sumika EnviroScience Co., Ltd.) were formulated. The coating composition constituting the first layer was applied to a PS substrate and dried in a constant temperature bath at 60°C for 120 minutes to form the first layer. Subsequently, as a coating composition constituting the second layer, 2.0% by mass of silica particles ((registered trademark) Kataloid SI-550 manufactured by JGC Catalysts and Chemicals Ltd.), 2.0% by mass of fluororesin particles ((registered trademark) Fluon AD911E manufactured by AGC Inc.), 1.0% by mass of an antiviral agent (neosinthol AV-18F manufactured by Sumika EnviroScience Co., Ltd.), and 1.0% by mass of a fungicide and antibacterial agent (MP-102SVP05 manufactured by Fuji Chemical Industry Co., Ltd.) were formulated. The coating composition constituting the second layer was applied onto the first layer and dried in a constant temperature bath at 60°C for 20 minutes to form the second layer. The average particle diameter of each particle contained in the formed coating film and the film thickness configuration of the first layer and the second layer are as shown in Table 1. The film thickness was measured by cross-sectional observation.

[0046] <Example 2> As a coating composition constituting the first layer, 1.0% by mass of spherical resin particles (TOSPEAL R3120 manufactured by Momentive), 0.5% by mass of an organic resin agent (polyurethane aqueous dispersion manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd.), and 0.5% by mass of an antiviral agent (neosinthol AV-18F manufactured by Sumika EnviroScience Co., Ltd.) were formulated. The coating composition constituting the first layer was applied to a PS substrate and dried in a constant temperature bath at 60°C for 120 minutes to form the first layer. Subsequently, as the coating composition constituting the second layer, 0.2% by mass of silica particles (Cataloid SI-550, manufactured by JGC Catalysts & Chemicals Ltd. (registered trademark)), 0.1% by mass of fluororesin particles (Fluon AD911E, manufactured by AGC Inc. (registered trademark)), 1.0% by mass of an antiviral agent (Neosinthol AV-18F, manufactured by Sumika Enviro Science Co., Ltd.), and 1.0% by mass of a fungicide and antibacterial agent (MP-102SVP05, manufactured by Fuji Chemical Industry Co., Ltd.) were blended. The coating composition constituting the second layer was applied onto the first layer and dried in a constant temperature bath at 60°C for 20 minutes to form the second layer. The average particle diameter of each particle contained in the formed coating film and the film thickness configuration of the first layer and the second layer are as shown in Table 1. The film thickness was measured by cross-sectional observation.

[0047] <Example 3> As the coating composition constituting the first layer, 2.0% by mass of spherical resin particles (TOSPEARL R130, manufactured by Momentive), 5.0% by mass of an organic resin agent (polyurethane aqueous dispersion, manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd.), and 0.5% by mass of an antiviral agent (Neosinthol AV-18F, manufactured by Sumika Enviro Science Co., Ltd.) were blended. The coating composition constituting the first layer was applied onto a PS substrate and dried in a constant temperature bath at 60°C for 120 minutes to form the first layer. Subsequently, as the coating composition constituting the second layer, 5.0% by mass of silica particles (Cataloid SI-550, manufactured by JGC Catalysts & Chemicals Ltd. (registered trademark)), 5.0% by mass of fluororesin particles (Fluon AD911E, manufactured by AGC Inc. (registered trademark)), 1.0% by mass of an antiviral agent (Neosinthol AV-18F, manufactured by Sumika Enviro Science Co., Ltd.), and 1.0% by mass of a fungicide and antibacterial agent (MP-102SVP05, manufactured by Fuji Chemical Industry Co., Ltd.) were blended. The coating composition constituting the second layer was applied onto the first layer and dried in a constant temperature bath at 60°C for 20 minutes to form the second layer. The average particle diameter of each particle contained in the formed coating film and the film thickness configuration of the first layer and the second layer are as shown in Table 1. The film thickness was measured by cross-sectional observation.

[0048] <Example 4> As the coating composition constituting the first layer, 1.0% by mass of spherical resin particles (XC99-A8808 manufactured by Momentive), 2.0% by mass of an organic resin agent (polyurethane aqueous dispersion manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd.), and 0.5% by mass of an antiviral agent (neosintol AV-18F manufactured by Sumika Enviro Science Co., Ltd.) were blended. The coating composition constituting the first layer was applied to a PS substrate and dried in a constant temperature bath at 60°C for 120 minutes to form the first layer. Subsequently, as the coating composition constituting the second layer, 2.0% by mass of silica particles ((registered trademark) Cataloid SI-550 manufactured by JGC Catalysts and Chemicals Ltd.), 2.0% by mass of fluororesin particles ((registered trademark) Fluon AD911E manufactured by AGC Inc.), 1.0% by mass of an antiviral agent (neosintol AV-18F manufactured by Sumika Enviro Science Co., Ltd.), and 1.0% by mass of a fungicidal and antibacterial agent (MP-102SVP05 manufactured by Fuji Chemical Industry Co., Ltd.) were blended. The coating composition constituting the second layer was applied onto the first layer and dried in a constant temperature bath at 60°C for 20 minutes to form the second layer. The average particle diameter of each particle contained in the formed coating film and the film thickness configuration of the first layer and the second layer are as shown in Table 1. The film thickness was measured by cross-sectional observation.

[0049] <Example 5> As the coating composition constituting the first layer, 1.0% by mass of spherical resin particles (TOSPEAL R3120 manufactured by Momentive), 2.0% by mass of an organic resin agent (polyurethane aqueous dispersion manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd.), and 0.5% by mass of an antiviral agent (neosintol AV-18F manufactured by Sumika Enviro Science Co., Ltd.) were blended. The coating composition constituting the first layer was applied to a PS substrate and dried in a constant temperature bath at 60°C for 120 minutes to form the first layer. Subsequently, as the coating composition constituting the second layer, 2.0% by mass of silica particles (Cataloid SI-550, manufactured by Nippon Shokubai Catalysts & Chemicals Co., Ltd. (registered trademark)), 2.0% by mass of fluororesin particles (Fluon AD911E, manufactured by AGC Inc. (registered trademark)), 1.0% by mass of an antiviral agent (Neosinthol AV-18F, manufactured by Sumika Enviro Science Co., Ltd.), and 1.0% by mass of a fungicide and antibacterial agent (MP-102SVP05, manufactured by Fuji Chemical Industry Co., Ltd.) were blended. The coating composition constituting the second layer was applied onto the first layer and dried in a constant temperature bath at 60°C for 20 minutes to form the second layer. The average particle diameter of each particle contained in the formed coating film and the film thickness configuration of the first layer and the second layer are as shown in Table 1. The film thickness was measured by cross-sectional observation.

[0050] <Example 6> As the coating composition constituting the first layer, 2.0% by mass of spherical resin particles (TOSPEAR L130, manufactured by Momentive), 2.0% by mass of an organic resin agent (polyurethane aqueous dispersion, manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd.), and 0.5% by mass of an antiviral agent (Neosinthol AV-18F, manufactured by Sumika Enviro Science Co., Ltd.) were blended. The coating composition constituting the first layer was applied onto a PS substrate and dried in a constant temperature bath at 60°C for 120 minutes to form the first layer. Subsequently, as the coating composition constituting the second layer, 2.0% by mass of silica particles (Snowtex ST-XS, manufactured by Nissan Chemical Industries, Ltd. (registered trademark)), 2.0% by mass of fluororesin particles (Fluon AD911E, manufactured by AGC Inc. (registered trademark)), 1.0% by mass of an antiviral agent (Neosinthol AV-18F, manufactured by Sumika Enviro Science Co., Ltd.), and 1.0% by mass of a fungicide and antibacterial agent (MP-102SVP05, manufactured by Fuji Chemical Industry Co., Ltd.) were blended. The coating composition constituting the second layer was applied onto the first layer and dried in a constant temperature bath at 60°C for 20 minutes to form the second layer. The average particle diameter of each particle contained in the formed coating film and the film thickness configuration of the first layer and the second layer are as shown in Table 1. The film thickness was measured by cross-sectional observation.

[0051] <Example 7> As a coating composition constituting the first layer, 2.0% by mass of spherical resin particles (TOSPEAL R130 manufactured by Momentive), 2.0% by mass of an organic resin agent (polyurethane aqueous dispersion manufactured by Daiichi Kogyo Seiyaku Co., Ltd.), and 0.5% by mass of an antiviral agent (neosinthol AV-18F manufactured by Sumika EnviroScience Co., Ltd.) were formulated. The coating composition constituting the first layer was applied to a PS substrate and dried in a constant temperature bath at 60°C for 120 minutes to form the first layer. Subsequently, as a coating composition constituting the second layer, 2.0% by mass of silica particles (Snowtex MP1040 (registered trademark) manufactured by Nissan Chemical Industries, Ltd.), 2.0% by mass of fluororesin particles (Fluon AD911E (registered trademark) manufactured by AGC Inc.), 1.0% by mass of an antiviral agent (neosinthol AV-18F manufactured by Sumika EnviroScience Co., Ltd.), and 1.0% by mass of a fungicidal and antibacterial agent (MP-102SVP05 manufactured by Fuji Chemical Industry Co., Ltd.) were formulated. The coating composition constituting the second layer was applied onto the first layer and dried in a constant temperature bath at 60°C for 20 minutes to form the second layer. The average particle diameter of each particle contained in the formed coating film and the film thickness configuration of the first layer and the second layer are as shown in Table 1. The film thickness was measured by cross-sectional observation.

[0052] <Example 8> As a coating composition constituting the first layer, 2.0% by mass of spherical resin particles (TOSPEAL R130 manufactured by Momentive), 2.0% by mass of an organic resin agent (polyurethane aqueous dispersion manufactured by Daiichi Kogyo Seiyaku Co., Ltd.), and 0.5% by mass of an antiviral agent (neosinthol AV-18F manufactured by Sumika EnviroScience Co., Ltd.) were formulated. The coating composition constituting the first layer was applied to a PS substrate and dried in a constant temperature bath at 60°C for 120 minutes to form the first layer. Subsequently, as the coating composition constituting the second layer, 2.0% by mass of silica particles (Snowtex ST-XS, manufactured by Nissan Chemical Industries, Ltd. (registered trademark)), 2.0% by mass of fluororesin particles (Fluon AD911E, manufactured by AGC Inc. (registered trademark)), 1.0% by mass of an antiviral agent (Neosinthol AV-18F, manufactured by Sumika Enviro Science Co., Ltd.), and 1.0% by mass of a fungicide and antibacterial agent (ATOMYBALL-UA, manufactured by JGC Catalysts & Chemicals Ltd.) were blended. The coating composition constituting the second layer was applied onto the first layer and dried in a constant temperature bath at 60°C for 20 minutes to form the second layer. The average particle diameter of each particle contained in the formed coating film and the film thickness configuration of the first layer and the second layer are as shown in Table 1. The film thickness was measured by cross-sectional observation.

[0053] <Example 9> As the coating composition constituting the first layer, 2.0% by mass of spherical resin particles (TOSPEAL R130, manufactured by Momentive), 2.0% by mass of an organic resin agent (polyurethane aqueous dispersion, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.), and 0.5% by mass of an antiviral agent (Neosinthol AV-18F, manufactured by Sumika Enviro Science Co., Ltd.) were blended. The coating composition constituting the first layer was applied onto a PS substrate and dried in a constant temperature bath at 60°C for 120 minutes to form the first layer. Subsequently, as the coating composition constituting the second layer, 2.0% by mass of silica particles (Snowtex MP-1040, manufactured by Nissan Chemical Industries, Ltd. (registered trademark)), 2.0% by mass of fluororesin particles (Fluon AD911E, manufactured by AGC Inc. (registered trademark)), 1.0% by mass of an antiviral agent (Neosinthol AV-18F, manufactured by Sumika Enviro Science Co., Ltd.), and 1.0% by mass of a fungicide and antibacterial agent (Essenger Guard 10, manufactured by Sinanenzymeomic Co., Ltd.) were blended. The coating composition constituting the second layer was applied onto the first layer and dried in a constant temperature bath at 60°C for 20 minutes to form the second layer. The average particle diameter of each particle contained in the formed coating film and the film thickness configuration of the first layer and the second layer are as shown in Table 1. The film thickness was measured by cross-sectional observation.

[0054] <Comparative Example 1> As a coating composition constituting the first layer, 2.0% by mass of an organic resin agent (polyurethane aqueous dispersion manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) and 0.5% by mass of an antiviral agent (Neosinthol AV-18F manufactured by Sumika Environmental Science Co., Ltd.) were blended. The coating composition constituting the first layer was applied to a PS substrate and dried in a constant temperature bath at 60°C for 120 minutes to form the first layer. Subsequently, as a coating composition constituting the second layer, 2.0% by mass of silica particles ((registered trademark) Cataloid SI-550 manufactured by JGC Catalysts & Chemicals Ltd.), 2.0% by mass of fluororesin particles ((registered trademark) Fluon AD911E manufactured by AGC Inc.), 1.0% by mass of an antiviral agent (Neosinthol AV-18F manufactured by Sumika Environmental Science Co., Ltd.), and 1.0% by mass of a fungicidal and antibacterial agent (MP-102SVP05 manufactured by Fuji Chemical Industry Co., Ltd.) were blended. The coating composition constituting the second layer was applied onto the first layer and dried in a constant temperature bath at 60°C for 20 minutes to form the second layer. The average particle diameter of each particle contained in the formed coating film and the film thickness configuration of the first layer and the second layer are as shown in Table 1. The film thickness was measured by cross-sectional observation.

[0055] <Comparative Example 2> As a coating composition constituting the first layer, 2.0% by mass of spherical resin particles (TOSPEAL R130 manufactured by Momentive), 2.0% by mass of an organic resin agent (polyurethane aqueous dispersion manufactured by Daiichi Kogyo Seiyaku Co., Ltd.), and 0.5% by mass of an antiviral agent (Neosinthol AV-18F manufactured by Sumika Environmental Science Co., Ltd.) were blended. The coating composition constituting the first layer was applied to a PS substrate and dried in a constant temperature bath at 60°C for 120 minutes to form the first layer. The second layer was not formed. The average particle diameter of each particle contained in the formed coating film and the film thickness configuration of the first layer are as shown in Table 1. The film thickness was measured by cross-sectional observation.

[0056] <Comparative Example 3> The first layer was not formed. As the coating composition constituting the second layer, 2.0% by mass of silica particles (Cataloid SI-550, manufactured by Nippon Shokubai Catalysts & Chemicals, Ltd. (registered trademark)), 2.0% by mass of fluororesin particles (Fluon AD911E, manufactured by AGC Inc. (registered trademark)) were used, and 0.5% by mass of an antiviral agent (Neosinthol AV-18F, manufactured by Sumika Enviro Science Co., Ltd.) and 1.0% by mass of a fungicidal and antibacterial agent (MP-102SVP05, manufactured by Fuji Chemical Industry Co., Ltd.) were added. The composition shown in Table 1 was applied and dried in a constant temperature bath at 60°C for 20 minutes to form a coating film. The average particle size of each particle contained in the formed coating film and the film thickness structure with the second layer are as shown in Table 1. The film thickness was measured by cross-sectional observation.

[0057] <Comparative Example 4> As the coating composition constituting the first layer, 2.0% by mass of spherical resin particles (TOSPEAL R130, manufactured by Momentive), 2.0% by mass of an organic resin agent (polyurethane aqueous dispersion, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.), and 0.5% by mass of an antiviral agent (Neosinthol AV-18F, manufactured by Sumika Enviro Science Co., Ltd.) were blended. The coating composition constituting the first layer was applied to a PS substrate and dried in a constant temperature bath at 60°C for 120 minutes to form the first layer. Subsequently, as the coating composition constituting the second layer, 6.0% by mass of fluororesin particles (Fluon AD911E, manufactured by AGC Inc. (registered trademark)), 0.5% by mass of an antiviral agent (Neosinthol AV-18F, manufactured by Sumika Enviro Science Co., Ltd.), and 1.0% by mass of a fungicidal and antibacterial agent (MP-102SVP05, manufactured by Fuji Chemical Industry Co., Ltd.) were blended. The coating composition constituting the second layer was applied onto the first layer and dried in a constant temperature bath at 60°C for 20 minutes to form the second layer. The average particle size of each particle contained in the formed coating film and the film thickness structure of the first layer and the second layer are as shown in Table 1. The film thickness was measured by cross-sectional observation.

[0058] <Comparative Example 5> As a coating composition constituting the first layer, 2.0% by mass of spherical resin particles (TOSPEARL R130 manufactured by Momentive), 2.0% by mass of an organic resin agent (polyurethane aqueous dispersion manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd.), and 0.5% by mass of an antiviral agent (neosinthol AV-18F manufactured by Sumika Environmental Science Co., Ltd.) were formulated. The coating composition constituting the first layer was applied to a PS substrate and dried in a constant temperature bath at 60°C for 120 minutes to form the first layer. Subsequently, as a coating composition constituting the second layer, 2.0% by mass of silica particles ((registered trademark) Kataloid SI-550 manufactured by JGC Catalysts and Chemicals Ltd.), 2.0% by mass of fluororesin particles ((registered trademark) Fluon AD911E manufactured by AGC Inc.), and 1.0% by mass of an antiviral agent (neosinthol AV-18F manufactured by Sumika Environmental Science Co., Ltd.) were formulated. The coating composition constituting the second layer was applied onto the first layer and dried in a constant temperature bath at 60°C for 20 minutes to form the second layer. The average particle diameters of the respective particles contained in the formed coating film and the film thickness configuration of the first layer and the second layer are as shown in Table 1. The film thickness was measured by cross-sectional observation.

[0059] Table 1 shows a list of the configurations of the average particle diameter of the spherical resin particles, the first layer film thickness, the second layer film thickness, the average particle diameter of the inorganic particles, and the average particle diameter of the antifungal and antibacterial particles for the coating films formed in Examples 1 to 9 and Comparative Examples 1 to 5 above. TIFF0007687448000001.tif99134

[0060] The performance of suppressing dust adhesion to the coating film was evaluated by evaluating the dust fixing property. Under the conditions of a temperature of 25°C and a humidity of 50%, JIS 15 types were sprayed onto the member having the coating film with air, and it was carried out after 10 seconds (initial) and after 5 hours had elapsed. Then, it was collected with a mending tape (manufactured by Sumitomo 3M Ltd.), and the absorbance (wavelength 550 nm) was measured with a spectrophotometer (manufactured by Shimadzu Corporation; UV-3100PC), and evaluated according to the following criteria. It can be said that the smaller the absorbance, the better the performance of suppressing dust adhesion to the coating film. <Dust adhesion suppression performance> 1: Those with an absorbance of less than 0.1. 2: Those with an absorbance of 0.1 or more and less than 0.2. 3: Those with an absorbance of 0.2 or more and less than 0.3. 4: Those with an absorbance of 0.3 or more and less than 0.4. 5: Those with an absorbance of 0.4 or more.

[0061] The mold prevention performance is defined in "JIS Z2911, 10. Tests of plastic products" as a qualitative test for evaluating the mold resistance of plastic products. Also, this test method is divided into three types, and method B was adopted this time. In the test, a mixed spore suspension containing the following five types of mold spores was used. The five types of mold spores are Aspergillus niger NBRC 105649, Penicillium pinophilum NBRC 33285, Paecilomyces variotii NBRC 33284, Trichoderma virens NBRC 6355, and Chaetomium globosum NBRC 6347. <Mold prevention performance> 0: No mold growth is observed macroscopically or microscopically. 1: No mold growth is observed macroscopically, but it is clearly confirmed microscopically. 2: Mold growth is observed macroscopically, and the area of the growing part is less than 25% of the total area of the sample. 3: Mold growth is observed macroscopically, and the area of the growing part is 25% or more and less than 50% of the total area of the sample. 4: The mycelium grows well, and the area of the growing part is 50% or more of the total area of the sample. 5: The growth of the mycelium is intense and covers the entire sample.

[0062] <Antiviral performance> The action time was 24 hours, the test virus was influenza A virus (H1N1 type), and the test was conducted in accordance with the antibacterial test method (ISO21702). The test sample (size 50 mm × 50 mm) was placed in a humidified petri dish, 0.1 - 0.2 ml of the virus solution was dropped, a film (PET) with a size of 40 mm × 40 mm was placed on it, and after 24 hours of increasing the contact efficiency between the test article and the virus, the virus was recovered from the test article and the antibacterial activity value was measured. Also, the antibacterial activity value after the water resistance test (category) was measured.

[0063] Table 2 shows the results of the antibacterial activity values of the dust adhesion suppression performance, antifungal performance, and antiviral performance based on the above test results. TIFF0007687448000002.tif93149

[0064] As shown in Table 2, the coating films of Examples 1 - 9 have good dust adhesion suppression performance, and also have high antifungal performance and antiviral performance. Among them, the coating film of Example 1 had the best dust adhesion suppression performance, antifungal performance, and antiviral performance. Also, the coating film with Comparative Example 1 has deteriorated dust adhesion suppression performance after 100 hours because spherical resin particles are not blended. Also, the coating film of Comparative Example 2 that does not contain the first layer has deteriorated antiviral performance after the water resistance test. Furthermore, the coating film of Comparative Example 3 has deteriorated dust adhesion suppression performance both initially and after 100 hours. The coating film of Comparative Example 4 has deteriorated dust adhesion suppression performance. The coating film of Comparative Example 5 has deteriorated antifungal performance. As can be seen from the above results, according to the present disclosure, it is possible to provide a coating film having dust adhesion suppression performance, antifungal performance, and antiviral performance and having long - term durability, and an air conditioner equipped with the same.

[0065] Each of the above-described Embodiments 1 to 3 can be implemented in combination with each other. Also, the configurations shown in the above embodiments are examples of the content of the present disclosure, and it is possible to combine them with other known technologies, and it is also possible to omit or change a part of the configuration without departing from the gist of the present disclosure.

Explanation of Signs

[0066] 1 Coating film 2 Substrate 3 First layer 4 Second layer 5 Organic resin agent 6 Antiviral agent 7 Inorganic particles 8 Fluororesin particles 9 Antifungal and antibacterial agent 10 Spherical resin particles 100 Indoor unit 110 Indoor unit main body 111 Suction port 112 Air outlet 113 Drain pan 114 Drain pan 115 Blower fan 116 Air duct wall 117 Heat exchanger 118 Heat exchanger 119 Heat exchanger 120 Up and down air direction variable vane 121 Front panel

Claims

1. A first layer formed on a substrate, and a second layer formed on the first layer, wherein the first layer contains spherical resin particles, an organic resin agent, and an antiviral agent, the second layer contains inorganic particles, fluororesin particles, a fungicidal and antibacterial agent, and an antiviral agent, furthermore, the water contact angle of the first layer is 60 degrees or more and less than 110 degrees, a part of the surface of the fluororesin particles is exposed from the surface of the second layer, and a coating film is dotted on the surface of the second layer.

2. The content of the spherical resin particles with respect to the first layer is 0.1% by mass or more and 10.0% by mass or less, the content of the fluororesin particles with respect to the second layer is 0.01% by mass or more and 5.0% by mass or less, the content of the inorganic particles with respect to the second layer is 0.01% by mass or more and 5.0% by mass or less, The coating film according to claim 1, wherein the content of the fungicidal and antibacterial agent is 0.1% by mass or more and 25.0% by mass or less with respect to the total mass of the inorganic particles and the fluororesin particles.

3. The coating film according to claim 1, wherein the film thickness of the first layer is 1.0 μm or more and 10.0 μm or less, and the film thickness of the second layer is 0.1 μm or more and 5.0 μm or less.

4. The coating film according to claim 3, wherein the average particle diameter of the spherical resin particles is 0.5 μm or more and 15.0 μm or less.

5. The coating film according to claim 3, wherein the average particle diameter of the fluororesin particles is 50 nm or more and 500 nm or less.

6. The inorganic particles are silica particles, and the coating film according to claim 3, wherein the average particle diameter of the silica particles is 5 nm or more and 100 nm or less.

7. The coating film according to claim 3, wherein the average particle diameter of the particles of the fungicidal and antibacterial agent is 0.1 μm or more and 3.0 μm or less.

8. An air conditioner having a component on which the coating film according to any one of claims 1 to 7 is formed.

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