JP2018131508A - Coating film composition for water-involving house facility equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coating film composition that maintains the antifouling performance of water-involving house facility equipment for a long period of time.SOLUTION: The present invention is a coating film composition including a thermosetting coating material having water repellency and oil repellency and a dispersed particle comprising inorganic particle and/or agglomerate thereof, and in which a cured coating film obtained by curing the coating film-forming material is formed on the surface of a substrate, and in the plan view of the cured coating film, the area ratio occupied by the inorganic particles and/or aggregates thereof is 20 to 60%. The thermosetting coating material preferably is a mixture of at least a first thermosetting coating material having water repellency and oil repellency and a second thermosetting coating material including inorganic particles.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a coating film forming technique for maintaining antifouling performance for a long period of time by improving the wear resistance of a cured coating film in a coating film composition formed on the surface of a base material of water-related household equipment.

  Examples of housing equipment around the water include kitchens, vanities and bathrooms, and examples of the parts include top plates, sinks, balls, mirrors, bathtubs, washing places, walls, and counters. As the base material used, thermosetting fiber reinforced materials such as SMC (Sheet Molding Compound), BMC (Bulk Molding Compound), TMC (Thick Molding Compound), thermosetting resins such as melamine resin and epoxy resin, A wide variety of materials such as acrylic resins, thermoplastic resins such as PP (polypropylene), PE (polyethylene), and PS (polystyrene), and metals such as stainless steel and decorative steel plates are used.

The parts of household equipment around the water are contaminated with water and hot water every time the user uses them. If left as it is, there is a risk of appearance deterioration and sanitary problems due to the occurrence of dirt, mold, scale, etc. was there.
Therefore, technologies have been devised to improve the antifouling and antifouling properties by adding hydrophilic and water / oil repellency functions to the surface of housing equipment around water. Since wiping and cleaning are performed on a daily basis, the function added to the surface of the part is damaged due to deterioration due to wear or the like, and it is difficult to maintain satisfactory antifouling properties for a long time.

Conventionally, as a method for maintaining the function added to the surface of a part of a water-related household equipment, the following Patent Document 1 discloses a method of forming a covering portion containing fluororesin particles on the surface of a resin counter. Yes.
Patent Document 2 discloses an antifouling member using an organic resin film having an aggregate containing silica particles and fluororesin particles.

JP 2006-346048 A Japanese Patent No. 6008786

  However, in the prior art described in Patent Document 1, the slip performance of the fluororesin particles blended in the coating portion and the scratch resistance are added by the uneven structure due to the self-shape of the fluororesin particles, and the design of the resin counter is improved. Although it is described as being maintained, it has been evaluated that the number of sliding of the evaluation test is 100 times, and in water-based household equipment that is wiped and cleaned on a daily basis for several decades, the scratch resistance and durability are There were problems such as not being enough.

  Moreover, in the prior art described in Patent Document 2, by providing an uneven structure on the surface of the coating film with an aggregate containing silica particles and fluororesin particles, the contact area with large dirt is reduced and the dirt is prevented from being attached and removed. Although it is described that an improvement in the effect is obtained, there is no suggestion of the durability of the coating film on the water-based housing equipment that is wiped and cleaned on a daily basis for several decades, and there is a concern about the durability.

  The present invention has been made in view of the above-described conventional problems, and is a coating composition that can continuously maintain the antifouling performance added to the surface of a part of a household equipment device around water for a long period of time. It is to provide.

The present invention has the following configuration as means for solving the above problems.
(1) The coating composition for water-based housing equipment of the present invention comprises a cured coating that is a cured product of a thermosetting paint having water and oil repellency, and an aggregate of inorganic particles and / or inorganic particles. A coating composition having a plurality of dispersed particles, wherein the cured coating film is formed on a surface of a substrate, and in a plan view of the cured coating film, the inorganic particles and / or an aggregate of inorganic particles The area ratio occupied by the plurality of dispersed particles is 20 to 60%.

  If the area ratio of a plurality of dispersed particles composed of inorganic particles and / or aggregates of inorganic particles is 20 to 60% in a plan view of the cured coating film, the surface of the cured coating film has the water / oil repellency effect. It is difficult for dirt to adhere to the surface, has excellent antifouling performance, and the dispersed particles present on the surface of the cured coating film constitute convex portions, and the inorganic dispersed particles present on the convex portions are used to wash sponges and the like used for cleaning. Receiving wear due to the material, the concave portions corresponding to the areas other than the convex portions on the surface of the cured coating film protect the water and oil repellency functions, and suppress the deterioration of the water and oil repellency functions over a long period of time.

(2) In the coating composition of the present invention, the thermosetting paint includes a first thermosetting paint having at least water and oil repellency, and second particles having inorganic particles and / or aggregates of inorganic particles. It is preferable that it is a mixture with the thermosetting paint.
By making a thermosetting paint into a mixture of two or more kinds of paints, it is possible to select and mix paints according to the purpose of use, to realize thermosetting paints, and the range of choice of paints to be used is expanded. Paints can be easily metered and mixed.

(3) In the coating film composition of the present invention, the first thermosetting paint is a silicone-modified acrylic urethane paint.
A cured coating film having water and oil repellency obtained by curing a silicone-modified acrylic urethane paint has easy handling and low cost. For this reason, a coating-film composition can be provided at low cost.

(4) In the coating film composition of the present invention, the inorganic particles are preferably silica particles.
If the inorganic particles are silica particles, they are hard and resistant to wear and will not dissolve even in the paint. Silica particles are also widely used as matte paints, are relatively easy to obtain, have good handleability, and are inexpensive. For this reason, a coating-film composition can be provided at low cost.

(5) In the coating composition of the present invention, the dispersed particles composed of the inorganic particles and / or aggregates of inorganic particles preferably have an average particle size of 10 to 40 μm.
When the average particle size of the dispersed particles exceeds 40 μm, the appearance of the coating composition is impaired, and when the average particle size is less than 10 μm, the effect of maintaining the cleaning properties of the coating composition is reduced.

(6) In the coating film composition of the present invention, the surface roughness of the cured coating film is preferably 0.3 to 0.7 μm in terms of arithmetic average roughness Ra.
If the surface roughness (arithmetic mean roughness) of the cured coating is within the above range, the projections of the uneven portions formed on the surface are sufficiently high to maintain the wear due to the cleaning material over a long period of time during cleaning. In addition, the inorganic particles present on the convex portions can withstand the cleaning with the cleaning material for a long time, and the presence of the sufficiently high convex portions prevents the inorganic particles from being lost on the surface due to wear. For this reason, it is suitable for use in housing equipment such as kitchen equipment that is repeatedly cleaned by wiping and cleaning, and can provide a coating composition that can maintain long-term performance.

(7) In the coating film composition of the present invention, it is preferable that the cured coating film is formed on a surface of a part of a household equipment device around water.
As a result, the antifouling performance added to the water-related housing equipment can be continuously maintained for a long time. That is, it is possible to provide a coating composition for housing equipment that can maintain the aesthetics of the surface for a long period of time.

  According to the present invention, a coating film capable of maintaining antifouling performance for a long period of time is formed on the surface of a part of a housing equipment device, thereby reducing wear deterioration due to wiping and cleaning, and a hygienic water-based house for a long period of time. Equipment equipment can be provided.

It is sectional drawing which shows an example of the coating composition which concerns on this invention. Sectional drawing which shows a coating-film composition when a coating film does not cover the surface dispersion | distribution particle | grains. It is a surface enlarged photograph which shows an example of the coating-film composition which concerns on this invention. It is a surface expansion photograph after a repeating cleaning test about an example of the coating-film composition which concerns on this invention. In an Example, it is a photograph which shows the result of having evaluated the oil repellent property when edible oil was spread on the coating-film composition surface, (A) is a photograph which shows the state where it was bad to play and wet and spread, (B) Is a photograph showing a state where the edible oil spread well and is spread into fine oil droplets.

Hereinafter, the details of the present invention will be described with reference to embodiments of the present invention.
FIG. 1 shows an example of a cross-sectional structure of the present embodiment. A cured coating film 2 including a plurality of dispersed particles 3 made of inorganic particles and / or aggregates of inorganic particles is formed on a substrate 1.
The cured coating film 2 is obtained by applying a thermosetting paint, which will be described later, and then drying, and a coating composition 10 is formed from the cured coating film 2 including a plurality of dispersed particles 3.
The surface portion of the cured coating film 2 has irregularities formed of a plurality of dispersed particles 3 and the surface of the cured coating film, and the surface of the cured coating film 2 is exposed between the convex portions 2b formed by the dispersed particles 3 on the surface. A recess 2a is formed. Although omitted in FIG. 1, a part of the thin cured coating film 2 is also coated on the surface of the dispersed particles 3 which are located on the surface portion of the cured coating film 2 and constitute the convex portions 2b.
Further, in FIG. 1, for the sake of simplification of explanation, the individual dispersed particles 3 are depicted as being dispersed in the cured coating film 2 alone, but the dispersed particles 3 shown in FIG. Aggregates obtained by agglomerating a plurality of particles may be used.

The substrate 1 of the present embodiment is not particularly limited, and thermosetting fiber reinforced materials such as SMC (sheet molding compound), BMC (bulk molding compound), TMC (thick molding compound), melamine resin, and epoxy resin. A base material 1 made of a wide variety of materials, such as thermosetting resins such as acrylic resins, thermoplastic resins such as PP (polypropylene), PE (polyethylene), and PS (polystyrene), and metals such as stainless steel and decorative steel plates Can be used.
Here, the base material 1 is a base material that constitutes a part of a top plate, a sink, a ball, a mirror, a bathtub, a washing place, a wall, a counter, etc. in a watering facility such as a kitchen, a vanity, and a bathroom. It is. In FIG. 1, a structure in which the coating composition 10 is coated on the upper surface of the base material 1 is depicted. However, since this structure can be applied to various base materials of various water facilities as described above, The coating composition 10 may be coated on one side surface, the back surface of the base material 1, the bottom surface of the base material 1, or any other necessary part.

Although there is no restriction | limiting in particular as a 1st thermosetting paint which has water repellency and oil repellency used as the base of the cured coating film 2, The handling property is favorable and the silicone modified acrylic urethane coating which is comparatively cheap is used. It is preferable.
In addition, thermosetting paints such as acrylic silicone resin paints, silicone resin paints, and fluororesin paints can be used as thermosetting paints having water and oil repellency.

The inorganic particles constituting the dispersed particles 3 contained in the thermosetting paint are not particularly limited, but silica particles are preferable from the viewpoints of handleability and cost. In addition, inorganic particles such as alumina particles, zirconia particles, calcium carbonate particles, and aluminum hydroxide particles can be used as the inorganic particles.
As the thermosetting paint on which the cured coating film 2 is based, a mixture of a first thermosetting paint having water and oil repellency and a second thermosetting paint containing the dispersed particles 3 can be used. As the second thermosetting paint used here, in addition to silicone-modified acrylic urethane paint, acrylic silicone resin paint, silicone resin paint, fluororesin paint, urethane resin paint, acrylic urethane resin paint, unsaturated polyester resin paint Thermosetting paints such as alkyd resin paints, epoxy resin paints, acrylic resin paints, and melamine resin paints can be used.

The average particle diameter of the dispersed particles 3 made of inorganic particles or aggregates of inorganic particles is preferably 10 μm to 40 μm. In the case of an aggregate of inorganic particles, the average particle diameter of the dispersed particles 3 made of each aggregate may be in the range of 10 μm to 40 μm in a state where inorganic particles having an average particle diameter smaller than the above range are aggregated.
Unless otherwise specified in the present specification, when a range is expressed as 10 μm to 40 μm, the range includes an upper limit and a lower limit. For this reason, 10 micrometers-40 micrometers means the range of 10 micrometers or more and 40 micrometers or less.
When the average particle size of the dispersed particles 3 is more than 40 μm, the appearance as the coating composition 10 is impaired, and when the particle size is less than 10 μm, the effect of maintaining the detergency is lowered.

  Diluents, color pigments, fillers, dispersants, surface conditioners, and the like can be appropriately used for the thermosetting paint as necessary.

  As a method for applying the thermosetting paint, it can be appropriately applied depending on the shape and size of the substrate to be applied, such as a flow coating method, a dipping method, a spray method, a roll coating method, a wiping method, and a spin coating method.

  There are no particular restrictions on the curing conditions for the thermosetting paint, but when an isocyanate is used as the curing agent in the silicone-modified acrylic urethane paint, a curing temperature of 90 ° C or higher is required to ensure the surface performance of the coating film. is there. As a result, the solvent resistance of the coating film is improved, and alcohol-based detergents such as sterilized alcohol can be used, which is effective for daily wiping and cleaning.

  The film thickness of the coating composition (water / oil repellent coat) 10 is preferably in the range of 1 to 10 μm, more preferably in the range of 3 to 7 μm, after curing. If the coating film composition 10 has a film thickness within the above range, the dispersed particles 3 are held in the film and easily come out on the surface, and it is possible to stably protect the water / oil repellency function of the recess 2a. is there. When the film thickness of the coating composition 10 is less than 1 μm, the water and oil repellency functions are remarkably deteriorated by repeated cleaning operations and cannot be used in actual use. When the coating composition 10 has a film thickness exceeding 10 μm, the dispersed particles 3 composed of inorganic substances and / or inorganic aggregates have fewer portions that become convex portions 2b on the surface of the coating composition, and receive wear due to repeated cleaning operations. Less effective and can not maintain water and oil repellency for a long time.

The film thickness of the cured coating film 2 including the irregularities formed by the dispersed particles 3 made of inorganic particles or aggregates of inorganic particles needs to be larger in the thickness direction than the film thickness of the coating portion, and the surface roughness is an arithmetic average. The roughness Ra is preferably in the range of 0.3 to 0.7 μm.
As shown in FIG. 2, the thickness of the coating portion referred to here is only the coating film portion excluding the inorganic particles 3 protruding on the surface, assuming a structure in which the coating film obtained by curing the inorganic particles 3 on the surface is not coated. It is the notation for showing the thickness of.

  In a plan view of the coating composition 10, the area ratio occupied by the dispersed particles 3 composed of the inorganic particles and / or aggregates of inorganic particles is preferably in the range of 20 to 60%. If the area ratio of the dispersed particles 3 is less than 20%, the desired amount of the washed particles 3 cannot be obtained because the number of the dispersed particles 3 is small. If the area ratio of the dispersed particles 3 exceeds 60%, the ratio of the dispersed particles 3 is large. In other words, the ratio of the concave portions 2a made of the cured coating film 2 is reduced, so that the water / oil repellency is deteriorated. Even if it is in the above-mentioned range in an area ratio, the range of 30 to 50% is preferable, and the range of 40 to 50% is more preferable.

  As a contact angle of the cured coating film 2, it is preferable that the contact angle of water is 90 degrees or more and the contact angle of oleic acid is 40 degrees or more. When the contact angle of water is 90 degrees or less, the repelling of water is weak, and when the contact angle of oleic acid is 40 degrees or less, the repelling of vegetable oil or the like is weak, and it is difficult to realize effects such as wiping property in actual use.

  Even if the surface of the housing equipment having the coating composition 10 formed as described above is cleaned by repeated cleaning, the surface is soiled by the water / oil repellency effect of the cured coating. It is hard to adhere, has excellent antifouling performance, and the dispersed particles of the inorganic substance present on the convex part 2b receive wear from a cleaning material such as a sponge used for cleaning, and protect the water and oil repellency functions of the concave part 2a. Therefore, it is possible to suppress deterioration of the water and oil repellency functions, and to provide hygienic water-related housing equipment for a long period of time.

EXAMPLES Hereinafter, although an Example demonstrates this invention further in detail, this invention is not restrict | limited to description of a following example. The base material used in each example was an artificial marble using BMC (bulk molding compound) as a molding material.
Example 1
100 parts by mass of silicone-modified acrylic urethane paint as thermosetting paint, 100 parts by mass of matte urethane paint (silica particle content 4.0% by mass) using silica particles as a matting agent, and curing of each paint 20 parts by mass and 10 parts by mass of isocyanate curing agent as an agent and 250 parts by mass of PMA (propylene glycol methyl ether acetate) as a diluent were mixed and mixed to contain silica particles and / or aggregates of silica particles. A water / oil repellent paint (thermosetting paint) was prepared.

Next, the surface of the artificial marble substrate was washed with isopropyl alcohol, and the water / oil repellent paint was sprayed onto the washed surface with a spray gun to obtain a coating composition having a thickness of about 5 μm.
Then, after standing for about 10 minutes, the artificial marble base material is placed in a drying oven at 90 ° C. for 1 hour to cure the water / oil repellent paint, and a water / oil repellent cured coating film containing inorganic particles. An artificial marble having a coating film composition formed on the surface was obtained.

(Example 2)
The water- and oil-repellent properties containing inorganic particles were the same as in Example 1 except that the silica particle content of the matte urethane coating using silica particles as a matting agent was 2.5% by mass. An artificial marble having a coating composition comprising a cured coating film formed on the surface was obtained.
(Example 3)
A water- and oil-repellent curing containing inorganic particles under the same conditions as in Example 1 except that the silica content of the matte urethane coating using silica particles as a matting agent was 9.5% by mass. An artificial marble having a coating composition composed of a coating film formed on the surface was obtained.
(Examples 4 and 5)
The water- and oil-repellent properties containing inorganic particles were the same as in Example 1 except that the silica particle content of the matte urethane coating using silica particles as a matting agent was 5.0% by mass. The artificial marbles of Examples 4 and 5 in which the coating composition composed of the cured coating film was formed on the surface were obtained.

(Comparative Example 1)
Example 1 except that 100 parts by mass of a silicone-modified acrylic urethane thermosetting paint, 20 parts by mass of an isocyanate-based curing agent as a curing agent for the paint, and 125 parts by mass of PMA as a diluent are used as the thermosetting paint. Under the conditions, an artificial marble having a water / oil-repellent cured coating film formed on the surface was obtained. The cured coating film of Comparative Example 1 is a coating film that does not contain silica particles.
(Comparative Example 2)
The water- and oil-repellent properties containing inorganic particles were the same as in Example 1 except that the silica particle content of the matte urethane coating using silica particles as a matting agent was 1.0 mass%. An artificial marble having a coating composition comprising a cured coating film formed on the surface was obtained.
(Comparative Example 3)
A water- and oil-repellent curing containing inorganic particles under the same conditions as in Example 1 except that the silica content of the matte urethane coating using silica particles as a matting agent was changed to 13.3% by mass. An artificial marble having a coating composition composed of a coating film formed on the surface was obtained.
(Comparative Example 4)
A water- and oil-repellent curing containing inorganic particles under the same conditions as in Example 1 except that the silica content of the matte urethane coating using silica particles as a matting agent was changed to 1.9% by mass. An artificial marble having a coating composition composed of a coating film formed on the surface was obtained.

(Evaluation method)
Using the obtained artificial marble, evaluation of the area ratio (plan view), average particle diameter, and arithmetic average roughness Ra of dispersed particles composed of silica particles or an aggregate of silica particles was performed by the method described below. It was.
“1” Area ratio of dispersed particles composed of silica particles or aggregates of silica particles The surface of the artificial marble is enlarged and observed with a digital microscope VHX-5000 (manufactured by Keyence Corporation, apparatus name), and image analysis software Win ROOF (Mitani) The area ratio of dispersed particles composed of silica particles and / or aggregates of silica particles was calculated using a trade name, manufactured by Shoji Co., Ltd., and used as the area ratio. In Table 1 described later, it is expressed as a silica area ratio (plan view).
FIG. 3 is an enlarged photograph taken by magnifying the surface of the artificial marble of Example 1 1000 times. As shown in FIG. 3, the dispersed particles are displayed in dark gray, the cured coating film is displayed in light gray, and the distinction between the two can be made clear, so that the area ratio of the dispersed particles can be calculated.

“2” Average particle size The surface of the artificial marble is magnified and observed with a digital microscope VHX-5000, and the particle size of 10 dispersed particles composed of aggregates of randomly selected silica particles and / or inorganic particles is measured. The average value is shown in Table 1 described later as the average particle diameter (μm).
"3" arithmetic average roughness Ra
The arithmetic average roughness Ra of the artificial marble surface was measured with a surface roughness shape measuring machine Surfcom 130A (manufactured by Tokyo Seimitsu Co., Ltd., apparatus name).

"4" Repeatable cleaning resistance Nylon scrub contains an aqueous solution of kitchen neutral detergent diluted to 3% with tap water. The nylon scrubbing is applied to the surface of each artificial marble described above, and a load of 30 g / cm ² is applied. While being applied, 300,000 reciprocating friction operations were performed. After the test, the sample was washed with water and air-dried for 24 hours, and then the edible oil repellent property of the friction part was evaluated. It shows as oil repelling after a repeated washing test in Table 1 to be described later.
FIG. 4 is an enlarged photograph obtained by enlarging the surface of the artificial marble of Example 1 after 1000 times magnification. In addition, the evaluation of oil repelling is as follows: when dyeing edible oil is spread on the surface of artificial marble, as shown in the photograph of FIG. 5 (A), when the oil droplets are wet and spread, the photograph of FIG. 5 (B). When it became fine oil droplets and separated, it was evaluated as ○.
The above test results are also shown in Table 1 below.

“5” Test Results From the results shown in Table 1, in the artificial marbles of Examples 1 to 5, the area ratio occupied by the inorganic particles and / or the aggregates of the inorganic particles is in the range of 20 to 60%, and the average particle size is By making the arithmetic average roughness Ra in the range of 10 to 40 μm and the arithmetic average roughness Ra in the range of 0.3 to 0.7 μm, it has an edible oil repelling after repeated cleaning tests, and has become an artificial marble with excellent durability. .
The artificial marble of Example 4 had the highest durability with 500,000 durability times for cooking oil after repeated cleaning tests. The artificial marbles of Examples 1 to 3 and 5 have been tested with a durability count of 300,000 times.
In the artificial marble of Example 5, the average particle size was 57 μm larger than the more preferable range and the roughness Ra was 0.8 μm larger than the more preferable range, but the area ratio occupied by the silica particles and / or the aggregates of the silica particles is desirable. Since it was 42% within the range, the desired durability of 300,000 times was shown.

On the other hand, the artificial marble of Comparative Example 1 did not repel edible oil after repeated cleaning tests because the cured coating film did not contain silica particles.
In Comparative Example 2, since the area ratio occupied by the silica particles and / or the aggregates of silica particles is 19% or less, the average particle diameter is 9 μm or less, and the arithmetic average roughness Ra is 0.3 μm or less, the ratio of inorganic particles is Too little, but endured repeated cleaning tests with 30,000 reciprocating friction operations, but could not withstand repeated cleaning tests with 50,000 reciprocating friction operations, and did not repel cooking oil after the cleaning test. .
In Comparative Example 3, the proportion of the inorganic particles is large, such as the area ratio occupied by the silica particles and / or the aggregates of the silica particles is 61% or more, the average particle diameter is 41 μm or more, and the arithmetic average roughness Ra is greater than 0.7 μm. . Therefore, when the coating on the silica particles disappears in the repeated cleaning test, the area ratio where the concave portion of the cured coating exists is small, the amount of water and oil repellent components is small, and edible oil is not repelled. It was. Further, the durability test endured repeated tests by 50,000 reciprocating friction operations, but it could not withstand repeated tests by 100,000 reciprocating friction operations.
In Comparative Example 4, the average particle diameter was set in a desirable range, but the area ratio occupied by silica particles and / or aggregates of silica particles was low, and Ra was too small, so oil repelling was poor and durability was also lowered.
From these contrasts, it was found that the area ratio of silica particles and / or aggregates of silica particles was the parameter having the greatest influence on durability. Therefore, after making the area ratio of the silica particles and / or the aggregates of the silica particles a desired range, it is effective to obtain a higher durability by further setting the average particle diameter or the roughness Ra to a desired range. Conceivable.

  When the artificial marble equivalent to these examples is applied as the surface of a part of a house equipment around water, for example, when applied to an artificial marble sink in a kitchen, the oil used in cooking or the dirt due to oil stains on food is difficult to be attached. It is possible to provide an artificial marble sink that is excellent in dirtiness and maintains antifouling performance even after repeated cleaning for a long period of time.

  According to the present invention, a coating film capable of maintaining antifouling performance for a long period of time can be formed on the surface of a part of household equipment, reducing wear deterioration due to wiping, etc. Housing equipment can be provided.

DESCRIPTION OF SYMBOLS 1 ... Base material, 2 ... Hardened coating film, 2a ... Concave part, 2b ... Convex part, 3 ... Dispersed particle, 10 ... Coating film composition.

Claims (7)

  A coating composition comprising a cured coating film, which is a cured product of a thermosetting paint having water and oil repellency, and a plurality of dispersed particles composed of inorganic particles and / or aggregates of inorganic particles. The cured coating film is formed on the material surface, and in a plan view of the cured coating film, the area ratio occupied by the plurality of dispersed particles composed of the inorganic particles and / or aggregates of inorganic particles is 20 to 60%. A characteristic coating composition.   The thermosetting paint is a mixture of at least a first thermosetting paint having water and oil repellency and a second thermosetting paint having inorganic particles and / or aggregates of inorganic particles. The coating composition according to claim 1.   The coating composition according to claim 2, wherein the first thermosetting paint is a silicone-modified acrylic urethane paint.   The coating composition according to any one of claims 1 to 3, wherein the inorganic particles are silica particles.   The coating composition according to any one of claims 1 to 4, wherein the inorganic particles and / or aggregates of inorganic particles have an average particle size of 10 to 40 µm.   6. The coating composition according to claim 1, wherein the surface roughness of the cured coating is 0.3 to 0.7 μm in terms of arithmetic average roughness Ra.   The coating film composition according to any one of claims 1 to 6, wherein the cured coating film is formed on a surface of a part of a household equipment device around water.