Lighting fixtures, indoor lighting fixtures, and antifouling coatings

Abstract

To provide an antifouling coating composition having both of a matte property and an antifouling property.SOLUTION: An antifouling coating composition contains a plurality of spherical first particles 22, and a binder resin 21. An antifouling coating film 20, formed from the antifouling coating composition, has a maximum height Rz of 5 μm or more and 20 μm or less and a 60-degree glossiness of 20% or less.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an antifouling coating composition, an antifouling coating composition for lighting fixtures, lighting fixtures, indoor lighting fixtures, and antifouling coating films. [Background technology]

[0002] Conventionally, matte coating films have been used to enhance design. For example, such matte coating films are formed by the coating composition disclosed in Patent Document 1.

[0003] The coating composition disclosed in Patent Document 1 comprises an acrylic resin, hard resin particles having an average particle size of 7 μm to 30 μm, and soft resin particles having an average particle size of 7 μm to 30 μm. In a coating film formed from such a coating composition, the particles cause light scattering. In other words, this coating film has a matte finish and can be used as a matte coating film. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-55597 Summary of the Invention [Problem to be solved by the invention]

[0005] In the matte coating film disclosed in Patent Document 1, the above particles form irregularities on the surface. Dirt easily adheres to these irregularities, and dirt that adheres to the recesses in particular is difficult to remove, so the coating film has poor anti-fouling properties. Furthermore, the matte properties and anti-fouling properties of the coating film depend on the size of the irregularities, and more specifically, there is a trade-off between them.

[0006] The present invention provides an antifouling coating composition having both matte properties and antifouling properties. [Means for solving the problem]

[0007] An antifouling coating composition according to one embodiment of the present invention comprises a plurality of spherical first particles and a binder resin, and an antifouling coating film formed from the antifouling coating composition has a maximum height Rz of 5 μm or more and 20 μm or less, and a 60-degree gloss of 20% or less.

[0008] An antifouling coating composition for lighting fixtures according to one embodiment of the present invention is the above-described antifouling coating composition used for lighting fixtures.

[0009] A lighting fixture according to one aspect of the present invention includes a member having an antifouling coating film for lighting fixtures formed from the above-described antifouling coating composition for lighting fixtures.

[0010] An indoor lighting fixture according to one aspect of the present invention is an indoor lighting fixture in which the above-described lighting fixture is used indoors.

[0011] An antifouling coating film according to one embodiment of the present invention is an antifouling coating film formed from the antifouling coating composition described above. [Effects of the Invention]

[0012] The antifouling coating composition of the present invention can have both matte properties and antifouling properties. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is a cross-sectional view showing an antifouling member having an antifouling coating film according to an embodiment. [Figure 2] FIG. 2 is a cross-sectional view of the lighting fixture according to the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, the embodiments will be described in detail with reference to the drawings. Note that the embodiments described below are all comprehensive or specific examples. The numerical values, shapes, materials, components, component placement and connection forms, steps, and step order shown in the following embodiments are merely examples and are not intended to limit the present invention. Furthermore, among the components in the following embodiments, components not recited in independent claims will be described as optional components.

[0015] It should be noted that the drawings are schematic diagrams and are not necessarily strict illustrations. In addition, in the drawings, substantially the same components are denoted by the same reference numerals, and overlapping descriptions may be omitted or simplified.

[0016] (Embodiment) [Antifouling paint composition] The antifouling coating composition according to this embodiment will be described below.

[0017] The antifouling coating composition is a liquid composition comprising a binder resin and a plurality of first particles.

[0018] First, the binder resin will be described.

[0019] The binder resin is a resin that binds and holds a plurality of first particles in the antifouling coating film, which is a film formed from the antifouling coating composition.

[0020] The binder resin according to the present embodiment is preferably a resin having high visible light transmittance. For example, the visible light transmittance of the binder resin is preferably 50% or more, more preferably 70% or more, even more preferably 80% or more, and even more preferably 90% or more.

[0021] The binder resin may be, for example, an acrylic resin, a polyester resin, a urethane resin, an acrylic urethane resin, a fluorine group-containing acrylic resin, a siloxane group-containing acrylic resin, an acrylic silicone resin, or a melamine resin. In particular, from the viewpoint of visible light transmittance, it is preferable to use an acrylic resin as the binder resin.

[0022] The acrylic resin is a resin obtained by polymerizing a monomer containing at least one of acrylate and methacrylate.

[0023] As the acrylate, for example, at least one of methyl acrylate, ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, isobornyl acrylate, glycidyl acrylate, benzyl acrylate, stearyl acrylate, lauryl acrylate, and 2-hydroxy-3-phenoxypropyl acrylate can be used.

[0024] Examples of methacrylates include methyl methacrylate, ethyl methacrylate, At least one of methyl methacrylate, 2-ethylhexyl methacrylate, isobornyl methacrylate, glycidyl methacrylate, benzyl methacrylate, stearyl methacrylate, lauryl methacrylate, and 2-hydroxy-3-phenoxypropyl methacrylate can be used.

[0025] Alternatively, an acrylate having a hydroxyl group or a methacrylate having a hydroxyl group may be used. As such an acrylate or methacrylate, for example, the above-mentioned acrylate or methacrylate into which a hydroxyl group has been introduced can be used. When an acrylate having a hydroxyl group or a methacrylate having a hydroxyl group is used, the acrylic resin is a so-called acrylic polyol resin.

[0026] The acrylic resin may be a copolymer of a monomer containing at least one of acrylate or methacrylate and a monomer having a carbon-carbon double bond. The monomer having a carbon-carbon double bond may be at least one of a styrene-based monomer, an olefin-based monomer, and a vinyl-based monomer. Examples of the styrene-based monomer include styrene. Examples of the olefin-based monomer include ethylene and propylene. Examples of the vinyl-based monomer include vinyl chloride and vinylidene chloride. The above-mentioned monomer components may be used alone or in combination of two or more.

[0027] When an acrylate having a hydroxyl group or a methacrylate having a hydroxyl group is used, the antifouling coating composition may further comprise a curing agent.

[0028] The curing agent is not particularly limited as long as it can react with a hydroxyl group to form a crosslink. Examples of the curing agent include an isocyanate-based curing agent and an amino-based curing agent, and it is preferable to use an isocyanate-based curing agent.

[0029] Examples of isocyanate-based curing agents that can be used include aliphatic diisocyanates such as lysine diisocyanate, hexamethylene diisocyanate, and trimethylhexane diisocyanate; alicyclic diisocyanates such as hydrogenated xylylene diisocyanate, isophorone diisocyanate, methylcyclohexane-2,4-diisocyanate, and methylcyclohexane-2,6-diisocyanate; aromatic diisocyanates such as tolylene diisocyanate, xylylene diisocyanate, and diphenylmethane diisocyanate; and organic polyisocyanates such as trivalent or higher polyisocyanates such as lysine triisocyanate. The isocyanate-based curing agent is preferably included so that the equivalent ratio (NCO / OH) of the isocyanate group (NCO) of the isocyanate resin to the hydroxyl group (OH) contained in the acrylic polyol resin is 0.2 to 2.0, and more preferably 0.5 to 1.5. As the amino resin, at least one of melamine resin, benzoguanamine resin, glycoluril resin, urea resin, and the like can be used.

[0030] Next, the plurality of first particles will be described.

[0031] The shape of each of the plurality of first particles is spherical. By spherical, we mean a perfect sphere, an ellipsoid, or an egg shape. In this way, it is preferable that the shape of each of the plurality of first particles is a rounded shape.

[0032] The average particle size of the plurality of first particles is preferably 20 μm or less. In this embodiment, the average particle size of the plurality of first particles is, for example, 3 μm or more and 7 μm or less. The average particle size of the plurality of first particles may be 3.5 μm or more and 6.5 μm or less, or 4 μm or more and 6 μm or less. good.

[0033] The first particles are composed of at least one of inorganic particles and polymer particles. More specifically, the first particles are composed of polymer particles, and in this embodiment, the first particles are composed of at least one of silicone resin particles, PTFE particles, wax particles, and acrylic resin particles, which are particles having slip properties.

[0034] Silicone resin particles are particles composed of a polymer with a main skeleton formed by siloxane bonds. PTFE stands for polytetrafluoroethylene, and PTFE particles are particles composed of PTFE. Wax particles are particles composed of natural wax, semi-synthetic wax, or synthetic wax. Acrylic resin particles are particles composed of the above-mentioned acrylic resin.

[0035] In the antifouling coating composition according to this embodiment, the ratio indicating the blending amount of the binder resin and the plurality of first particles may be as follows.

[0036] When the solid content of the binder resin is taken as 100 parts by mass, the solid content of the plurality of first particles is preferably 5 parts by mass or more and 95 parts by mass or less, more preferably 20 parts by mass or more and 80 parts by mass or less, and even more preferably 40 parts by mass or more and 70 parts by mass or less. Furthermore, the above is an example, and the ratio between the binder resin and the plurality of first particles does not have to be as stated above.

[0037] [Anti-fouling coating] Next, the antifouling coating film 20 formed by the antifouling coating composition will be described.

[0038] FIG. 1 is a cross-sectional view showing an antifouling member 1 having an antifouling coating film 20 according to this embodiment.

[0039] The antifouling member 1 includes a substrate 10 and an antifouling coating film 20 formed on the substrate 10.

[0040] The antifouling coating film 20 is a film formed from an antifouling paint composition, and therefore has a binder resin 21 and a plurality of first particles 22.

[0041] The antifouling coating film 20 may be produced by the following production method.

[0042] The antifouling coating film 20 is formed by applying the antifouling coating composition according to this embodiment to the main surface of the substrate 10 and then curing it. As the application method, at least one of spraying, bar coating, dipping, flow coating, spin coating, roll coating, sponging, etc. can be used.

[0043] Methods for curing the antifouling coating composition include a method in which the organic solvent in the antifouling coating composition is removed by heating, a method in which a curing agent is blended into the antifouling coating composition and the composition is thermally cured, and a method in which the composition is cured by irradiation with light (e.g., ultraviolet light).

[0044] In the antifouling coating film 20, the plurality of first particles 22 may be dispersed or aggregated in the binder resin 21. More specifically, several to several tens of first particles 22 may be aggregated. As shown in FIG. 1, the plurality of first particles 22 include first particles 22 having a portion of their surface not coated with the binder resin 21, and first particles 22 having the entire surface coated with the binder resin 21. In the first particles 22 having a portion of their surface not coated with the binder resin 21, the portion of the surface is an exposed portion where the first particles 22 are exposed. This corresponds to the region 22a. Since the antifouling coating film 20 has a plurality of first particles 22, the surface of the antifouling coating film 20 is not a smooth surface but has irregularities.

[0045] The maximum height Rz of the surface of the antifouling coating film 20 is an example of an index showing the size of such irregularities. In this embodiment, the maximum height Rz is 5 μm or more and 20 μm or less. Furthermore, the maximum height Rz is preferably 7 μm or more and 19 μm or less, and even more preferably 8 μm or more and 18 μm or less. The maximum height Rz is a value defined in JIS B 0601 (2001).

[0046] The antifouling coating film 20 has a plurality of first particles 22 and has irregularities corresponding to a maximum height Rz of 5 μm or more, so that the antifouling coating film 20 has light scattering properties (light diffusibility). Therefore, light incident on the antifouling coating film 20 is scattered and is less likely to be specularly reflected. This results in an antifouling coating film 20 with low gloss, that is, a matte finish.

[0047] More specifically, in this embodiment, the 60-degree gloss of the antifouling coating film 20 is 20% or less. Furthermore, the 60-degree gloss is preferably 15% or less, and even more preferably 10% or less. The lower the 60-degree gloss, the higher the matte property.

[0048] Furthermore, since the maximum height Rz is 20 μm or less, the antifouling coating film 20 has high antifouling properties. More specifically, in unevenness having a maximum height Rz of 20 μm or less, in other words, unevenness of a size that is sufficiently small from the viewpoint of antifouling properties, dirt is less likely to adhere, and even if dirt does adhere to a recess, the dirt is easily removed.

[0049] [Examples of antifouling coatings] Next, the results of evaluation of the performance of the antifouling coating film according to this embodiment will be described.

[0050] Here, eight samples were produced and evaluated, including the samples of Comparative Examples 1 to 5 and Examples 1 to 3. The production methods and evaluation results are described below.

[0051] <Production method> Each of the eight samples is a test piece for evaluation, which includes a substrate made of a steel plate and a coating film formed on the main surface of the substrate. The eight samples each have a different coating film configuration.

[0052] Table 1 shows the configurations of the coating compositions used to prepare the eight samples according to this embodiment and the evaluation results.

[0053] [Table 1]

[0054] In all eight samples, a white coating film is formed by depositing a white paint (Porcelac 3000-37 manufactured by Kawakami Paint Co., Ltd.) on a substrate made of a steel plate as a first coating film.

[0055] The white paint contains polyester acrylic and irregularly shaped calcium carbonate particles with an average particle diameter of 6 μm. In the white paint, the polyacrylic ester is used as a binder resin, and the calcium carbonate particles are used as light-scattering particles.

[0056] The white coating film is formed by applying a white paint and then heat-treating the applied white paint at 165°C for 20 minutes. The thickness of the white coating film is 150 μm. The white coating film also contains polyacrylic ester and light-scattering particles.

[0057] Furthermore, an antifouling coating film is formed as a second coating film on the surface of the white coating film in the samples of Comparative Examples 2 to 5 and Examples 1 to 3. That is, in the sample of Comparative Example 1, only a white coating film is formed on the substrate, while in the samples of Comparative Examples 2 to 5 and Examples 1 to 3, a white coating film and an antifouling coating film are formed on the substrate.

[0058] This antifouling coating film is a film formed from an antifouling coating composition.

[0059] The antifouling coating compositions of Comparative Examples 2 to 5 are used for the samples of Comparative Examples 2 to 5. The antifouling coating compositions of Examples 1 to 3 are used for the samples of Examples 1 to 3.

[0060] Each of the antifouling coating compositions of Comparative Examples 2 to 5 and Examples 1 to 3 comprises a binder resin, a curing agent for curing the binder resin, a plurality of particles, and butyl acetate as a solvent. Each of the antifouling coating films of Comparative Examples 2 to 5 and Examples 1 to 3 formed from such antifouling coating compositions comprises a binder resin, a curing agent, and a plurality of particles.

[0061] The binder resin contained in each of the antifouling coating compositions of Comparative Examples 2 to 5 and Examples 1 to 3 corresponds to binder resin 21 according to this embodiment, and is an acrylic polyol resin (Acrydic WXU-880-BA manufactured by DIC Corporation).

[0062] The curing agent contained in each of the antifouling coating compositions of Comparative Examples 2 to 5 and Examples 1 to 3 is an isocyanate-based curing agent (Burnoc DN-981, manufactured by DIC Corporation). The antifouling coating compositions of Examples 1 to 3 correspond to the antifouling coating compositions of this embodiment, and the antifouling coating films of Examples 1 to 3 correspond to antifouling coating film 20 of this embodiment.

[0063] That is, the plurality of particles contained in each of the antifouling coating compositions and the antifouling coating film 20 of Examples 1 to 3 correspond to the plurality of first particles 22 according to this embodiment.

[0064] Here, the antifouling coating composition of Comparative Example 2 is diluted with butyl acetate. More specifically, the antifouling coating composition of Comparative Example 2 is diluted so that the solid content mass of the antifouling coating composition of Comparative Example 2 is 20 mass% when the total mass of the antifouling coating composition of Comparative Example 2 is 100 mass%. The solid content in the antifouling coating composition of Comparative Example 2 is the total solid content of the resin binder, the curing agent, and the plurality of first particles.

[0065] Similarly, each of the antifouling coating compositions of Comparative Examples 3 to 5 and Examples 1 to 3 was diluted with butyl acetate so that the solid content was 20% by mass.

[0066] Furthermore, the blending amounts of the plurality of particles are shown in Table 1. Here, the blending amounts of the plurality of particles are shown in parts by mass of the solid content when the solid content of the binder resin (binder resin 21 according to the present embodiment) is taken as 100 parts by mass.

[0067] Here, the differences between the antifouling coating compositions of Comparative Examples 2 to 5 and the antifouling coating compositions of Examples 1 to 3 will be explained.

[0068] First, the differences between the antifouling coating compositions of Comparative Examples 2 to 5 and the antifouling coating composition of the present embodiment will be explained.

[0069] The antifouling coating composition of Comparative Example 2 differs from the plurality of first particles 22 of the antifouling coating composition of the present embodiment in that the average particle diameter of the plurality of particles is 2 μm. Furthermore, "Tospearl 120 manufactured by Momentive Performance Materials Japan LLC" is used as the plurality of particles in the antifouling coating composition of Comparative Example 2.

[0070] The antifouling coating composition of Comparative Example 3 differs from the plurality of first particles 22 in the antifouling coating composition of the present embodiment in that the plurality of particles have an irregular shape and an average particle diameter of 8 μm. Furthermore, "Dyneon TF9205 manufactured by 3M Japan" is used as the plurality of particles in the antifouling coating composition of Comparative Example 3.

[0071] The antifouling coating composition of Comparative Example 4 differs from the plurality of first particles 22 in the antifouling coating composition of the present embodiment in that the plurality of particles is composed of silica particles and has an irregular shape. Furthermore, "Sylysia 356RC manufactured by Fuji Silysia Chemical Co., Ltd." is used as the plurality of particles in the antifouling coating composition of Comparative Example 4.

[0072] In the antifouling coating composition of Comparative Example 5, the solid content of the plurality of particles is 100 parts by mass, which is different from the blending amount in the antifouling coating composition of the present embodiment. The Tospearl 145 manufactured by Als Japan LLC is used.

[0073] Furthermore, the antifouling coating compositions of Examples 1 to 3 will be explained.

[0074] In the antifouling coating composition of Example 1, the plurality of first particles 22 are composed of silicone resin particles, are spherical in shape, and have an average particle diameter of 4.5 μm. Furthermore, "Tospearl 145 manufactured by Momentive Performance Materials Japan LLC" is used as the plurality of first particles 22 in the antifouling coating composition of Example 1.

[0075] In the antifouling coating composition of Example 2, the plurality of first particles 22 are composed of PTFE particles, have an ellipsoidal shape, and have an average particle diameter of 5 μm. Furthermore, "Polyflon L-5 manufactured by Daikin Industries, Ltd." is used as the plurality of first particles 22 in the antifouling coating composition of Example 2.

[0076] In the antifouling coating composition of Example 3, the plurality of first particles 22 are composed of acrylic resin particles, have a spherical shape, and have an average particle diameter of 5 μm. Furthermore, "Techpolymer MBX-5 manufactured by Sekisui Plastics Co., Ltd." is used as the plurality of first particles 22 in the antifouling coating composition of Example 3.

[0077] The antifouling coating compositions of Comparative Examples 2 to 5 and Examples 1 to 3 are applied to the white coating film formed as the first coating layer. First, each of the antifouling coating compositions of Comparative Examples 2 to 5 and Examples 1 to 3 is subjected to a dispersion treatment using a disper (a stirrer). More specifically, the dispersion treatment is performed for 5 minutes at a rotation speed of 500 rpm using a bladed disper. Next, the antifouling coating compositions of Comparative Examples 2 to 5 and Examples 1 to 3 are applied using a No. 16 bar coater, and the binder resin 21 is cured by heat treatment at 120°C for 20 minutes. This forms an antifouling coating film as the second coating layer.

[0078] As described above, eight samples were prepared by forming films of the white paint and the antifouling paint composition.

[0079] <Evaluation results> Here, the maximum height Rz, 60-degree gloss and antifouling properties were evaluated for each of the eight samples.

[0080] First, we will briefly explain the evaluation method.

[0081] The maximum height Rz was evaluated by the following method.

[0082] The eight samples were observed using a laser microscope (Keyence VK-X200 laser microscope) with a 20x objective lens, and corresponding images were acquired. The maximum heights Rz of the eight samples were calculated from the acquired images corresponding to the eight samples using the accompanying analysis software (VK-H1XA). More specifically, three images were acquired for each sample, and the average value of the three maximum heights Rz obtained from the acquired three images was calculated as the maximum height Rz of that sample.

[0083] The 60 degree gloss was evaluated by the following method.

[0084] The 60-degree gloss was measured for eight samples using a gloss meter (Rhopoint IQ-S Appearance Analyzer manufactured by Rhopoint Instruments Ltd.). More specifically, three 60-degree gloss measurements were performed for each sample. The average of the three 60-degree gloss values ​​was measured and calculated as the 60-degree gloss value of the sample. Table 1 shows the pass / fail judgment of the 60-degree gloss value and the 60-degree gloss value, with a "◯" indicating pass if the 60-degree gloss value is 20% or less, and an "×" indicating fail if the 60-degree gloss value is more than 20%.

[0085] The stain resistance was evaluated by the following method.

[0086] First, the simulated soil used to evaluate the soil resistance will be described. A mixture of calcium carbonate (Escalon 3500 (average particle size 1 μm) manufactured by Sankyo Flour Milling Co., Ltd.) and carbon black (manufactured by Sigma-Aldrich Japan Co., Ltd.) was used as the simulated soil. The mixture ratio was 97% by mass of calcium carbonate and 3% by mass of carbon black.

[0087] Using this simulated soil, a first soiling resistance test and a second soiling resistance test were carried out.

[0088] The first antifouling test was a dirt drop test, in which the difficulty of dirt adhering was evaluated.

[0089] First, artificial soil was attached to eight samples. At this time, the artificial soil was sieved using a sieve (Iida Seisakusho sieve (opening 500 μm)) at a concentration of 6 mg / cm on each surface of the eight samples. 2 Processing was carried out so that

[0090] Furthermore, eight samples with artificial soil attached were placed vertically on a horizontal test table (such as a desk) and lifted 2 cm while maintaining the vertical position. The eight samples were then allowed to free fall vertically and vibrated. The weight of the artificial soil attached before the free fall (Wa) and the weight of the artificial soil remaining on each of the eight samples after the free fall (Wb) were measured, and the soil removal rate (%) was calculated using Equation 1.

[0091] (Formula 1) Dirt removal rate = {(Wa-Wb) / Wa} x 100

[0092] In other words, the higher the dirt removal rate, the more difficult it is for dirt to adhere. Table 1 shows the pass / fail result of the first stain-resistant property test and the dirt removal rate, with a "◯" indicating a pass if the dirt removal rate is 90% or more, and an "×" indicating a fail if the dirt removal rate is less than 90%.

[0093] The second antifouling test was a stain wiping test, in which the ease of stain removal was evaluated.

[0094] First, the L*a*b* color space of the eight samples was measured using a colorimeter (Konica Minolta CM-700d spectrophotometer).

[0095] Next, artificial soiling was applied in the same manner as in the first antifouling test, and a wiping action was performed 10 times with a cloth (Toray Tracy MK manufactured by Toray) so as to wipe off the artificial soiling.

[0096] Furthermore, after the wiping operation, the L*a*b* color space was measured again.

[0097] The color difference ΔE was calculated from the L*a*b* color space before the stain was attached and the L*a*b* color space after the wiping operation. The smaller the color difference ΔE, the more artificial stains were removed, which means the stains were easier to remove. Table 1 shows the pass / fail result of the second stain resistance test and the color difference ΔE, with a "◯" indicating a pass if the color difference ΔE is 5 or less, and an "×" indicating a fail if the color difference ΔE is greater than 5.

[0098] Furthermore, the evaluation results will be explained.

[0099] The white coating film of Comparative Example 1 is provided with light-scattering particles, which results in an uneven surface for the white coating film of Comparative Example 1. Similarly, the antifouling coating films of Comparative Examples 2 to 5 and the antifouling coating film 20 of Examples 1 to 3 are provided with a plurality of particles, which results in an uneven surface for the antifouling coating films of Comparative Examples 1 to 5 and the antifouling coating film 20 of Examples 1 to 3.

[0100] On these uneven surfaces, the maximum height Rz values ​​shown in Table 1 are obtained.

[0101] Here, attention is focused on the relationship between the maximum height Rz and the matte property.

[0102] When the maximum height Rz is 5 μm or more, sufficient light scattering occurs on the uneven surface, thereby achieving a high matte finish. Specifically, Table 1 shows that the samples of Comparative Example 1, Comparative Examples 3 to 5, and Examples 1 to 3 have a 60-degree gloss of 20% or less, and therefore have a high matte finish.

[0103] Furthermore, as shown by the samples of Comparative Examples 3 to 5 and Examples 1 to 3, when the average particle diameter of the plurality of first particles 22 is 3 μm or more, the maximum height Rz is likely to be 5 μm or more, and therefore, a high matte finish is easily achieved.

[0104] Furthermore, attention will be paid to the relationship between the maximum height Rz and the antifouling property.

[0105] When the maximum height Rz is 20 μm or less, dirt is less likely to adhere to the uneven surface, and even if dirt does adhere to the recesses, the dirt is easily removed. In other words, high antifouling properties can be achieved. Specifically, Table 1 shows that the samples of Examples 1 to 3 passed the first and second antifouling tests and had high antifouling properties.

[0106] Furthermore, the sample of Comparative Example 3 is compared with the samples of Examples 1 to 3. When the average particle diameter of the plurality of first particles 22 is less than 7 μm, the maximum height Rz is likely to be 20 μm or less, and therefore, high antifouling properties are likely to be achieved.

[0107] Furthermore, attention is focused on the relationship between the shapes of the plurality of first particles and the antifouling properties.

[0108] In Examples 1 to 3, the shape of the plurality of first particles 22 is spherical. Such particles do not have protrusions that easily catch dirt, making it difficult for dirt to adhere to them. Therefore, even higher antifouling properties can be achieved.

[0109] In Examples 1 to 3, silicone resin particles, PTFE particles, and acrylic resin particles are used as the plurality of first particles 22, respectively. As described above, silicone resin particles, PTFE particles, wax particles, and acrylic resin particles are all particles with slipperiness. By using such particles, dirt is less likely to adhere to the uneven surface, and even if dirt does adhere to the recesses, this dirt is more easily removed. Therefore, even higher antifouling properties can be achieved. As described above, even higher antifouling properties can be achieved when there is an exposed region 22a.

[0110] [Lighting fixtures] Next, the configuration of lighting device 100 according to this embodiment will be described.

[0111] FIG. 2 is a cross-sectional view of lighting device 100 according to the present embodiment.

[0112] The lighting fixture 100 includes a light source unit 200 and a light reflecting member 300. For example, the lighting fixture 100 is used for lighting a room ceiling. It is an indoor lighting fixture that is installed in a hole provided in a member 400. Note that the lighting fixture 100 is equipped with members that support the light source unit 200, the light reflecting member 300, etc., but these are not shown here.

[0113] The light source unit 200 has a plurality of light-emitting elements and is a light-emitting member that emits light L. As the light-emitting elements, LED elements configured by LEDs (Light Emitting Diodes), semiconductor light-emitting elements such as semiconductor lasers, organic EL (Electro Luminescence) elements, inorganic EL elements, etc. are used.

[0114] The light-reflecting member 300 is a member having a substrate, a light-reflecting film, and an antifouling coating film. An example of the light-reflecting film is the white coating film described above. The light-reflecting film and the antifouling coating film are laminated in this order on the main surface of a flat substrate, and the antifouling coating film is the outermost film in the light-reflecting member 300. Light L emitted from the light source unit 200 is reflected by the light-reflecting film of the light-reflecting member 300 and is used, for example, as illumination light to illuminate an indoor space.

[0115] Here, the antifouling coating film of the light-reflecting member 300 corresponds to the antifouling coating film 20 according to this embodiment, that is, a film formed from the antifouling paint composition according to this embodiment. In other words, the above-mentioned antifouling paint composition is an antifouling paint composition for lighting fixtures that is used in the lighting fixture 100. The antifouling coating film of the light-reflecting member 300 is a film formed from this antifouling paint composition for lighting fixtures, that is, an antifouling coating film for lighting fixtures.

[0116] As described above, the antifouling coating film (antifouling coating film 20) of the light reflecting member 300 has both a matte finish and antifouling properties. Since the antifouling coating film is provided on the outermost surface of the light reflecting member 300, the light reflecting member 300 also has both a matte finish and antifouling properties. In other words, dirt does not easily adhere to the light reflecting member 300, and even if dirt does adhere to the recesses, this dirt is easily removed. Furthermore, the light reflecting member 300 has a matte finish, and exhibits high designability.

[0117] Furthermore, when the lighting fixture 100 is used indoors, it is often maintained (cleaned) by the user. For example, the lighting fixture 100 is maintained by wiping it down by hand. As shown in Table 1, the antifouling coating film of the light reflecting member 300 passed the second antifouling test, meaning that it is easy to clean by wiping it down. In other words, when the lighting fixture 100 is used indoors, it is easy for the user to maintain it.

[0118] That is, when lighting fixture 100 is used indoors, it is often cleaned by wiping, so it is highly valuable for the antifouling coating film to have high antifouling properties in a stain wiping test.

[0119] [Other components of antifouling coating composition] Here, components of the antifouling coating composition other than the binder resin 21, the curing agent, and the plurality of first particles 22 will be described.

[0120] The antifouling coating composition may further contain a conductive material. In this case, the surface resistivity of the antifouling coating film 20 formed by the antifouling coating composition is 10 13 More specifically, the surface resistivity of the antifouling coating film 20 is, for example, 10 7 Ω / Sq or more 10 13 The surface resistivity is less than Ω / Sq. The surface resistivity can be measured in accordance with Japanese Industrial Standard JIS K6911 (general testing method for thermosetting plastics). When the surface resistivity of the antifouling coating film 20 is within the above range, the antifouling coating film 20 has antistatic properties. In such an antifouling coating film 20, adhesion of electrostatic contaminants such as dust can be further suppressed.

[0121] That is, the antifouling coating composition further comprises a conductive material, and the surface resistivity of the antifouling coating film 20 is 10 13 When the resistance is less than Ω / Sq, higher antifouling properties are realized.

[0122] The conductive material is composed of at least one of a conductive filler and a conductive polymer.

[0123] The conductive filler is made of a metal or an inorganic compound.

[0124] The metal constituting the conductive filler may be, for example, at least one metal selected from silver, copper, and gold, which have high electrical conductivity.

[0125] The inorganic compound constituting the conductive filler may be an inorganic compound having visible light transparency, such as at least one inorganic compound selected from the group consisting of antimony-doped tin oxide (antimony-doped tin dioxide), aluminum-doped zinc oxide, gallium-doped zinc oxide, and indium tin oxide.

[0126] Furthermore, the shape of the conductive filler is not particularly limited, but may be elongated, for example, needle-shaped. The average aspect ratio of the needle-shaped conductive filler is preferably 10 or more, more preferably 15 or more, and even more preferably 20 or more. The upper limit of the average aspect ratio of the needle-shaped conductive filler is not particularly limited, but may be, for example, 100.

[0127] The needle-like shape of the conductive filler prevents the conductive paths formed by the conductive filler from being cut in the antifouling coating film formed from the antifouling paint composition, which makes it easier for the surface resistivity of the antifouling coating film to reach the above-mentioned value, thereby improving the antistatic properties of the antifouling coating film 20.

[0128] As the conductive polymer, a polythiophene-based polymer, a polyaniline-based polymer, a polyacetylene-based polymer, or the like can be used.

[0129] The antifouling coating composition may further comprise a water- and oil-repellent resin or a water- and oil-repellent surfactant.

[0130] This provides the surface of the antifouling coating film with water and oil repellency, making it difficult for dirt to adhere and facilitating removal of any dirt that does adhere, thereby realizing an antifouling coating composition with even higher antifouling properties.

[0131] The water- and oil-repellent resin is, for example, a fluororesin or a silicone resin.

[0132] The fluororesin can be a resin obtained by polymerizing a fluorine-containing monomer, such as at least one of tetrafluoroethylene, chlorotrifluoroethylene, vinylidene fluoride, vinyl fluoride, fluorovinyl ether, and hexafluoropropylene.

[0133] The fluororesin may be a copolymer of a fluorine-containing monomer and a monomer having a carbon-carbon double bond. As the monomer having a carbon-carbon double bond, at least one of a styrene-based monomer, an olefin-based monomer, a vinyl-based monomer, and an acrylic-based monomer can be used. As the styrene-based monomer, for example, styrene can be mentioned. As the olefin-based monomer, for example, ethylene and propylene can be mentioned. As the vinyl-based monomer, for example, vinyl chloride and vinylidene chloride can be mentioned. As the acrylic-based monomer, for example, acrylate and methacrylate can be mentioned. The above-mentioned monomer components may be used alone or in combination of two or more.

[0134] Specific examples of fluororesins that can be used include at least one of polytetrafluoroethylene (PTFE) resin, polychlorotrifluoroethylene (PCTFE) resin, polyvinylidene fluoride (PVDF) resin, polyvinyl fluoride (PVF) resin, tetrafluoroethylene-perfluoroalkyl vinyl ether (PFA) copolymer, tetrafluoroethylene-hexafluoropropylene (FEP) copolymer, ethylene-tetrafluoroethylene (ETFE) copolymer, and ethylene-chlorotrifluoroethylene (ECTFE) copolymer.

[0135] Silicone resins are polymers with a main skeleton formed by siloxane bonds, and can be produced using, for example, organohalosilanes or organoalkoxysilanes as raw materials.

[0136] The organohalosilane may be, for example, at least one of methyltrichlorosilane, dimethyldichlorosilane, trimethylchlorosilane, ethyltrichlorosilane, diethyldichlorosilane, and triethylchlorosilane. The organoalkoxysilane may be, for example, at least one of organomonoalkoxysilane, organodialkoxysilane, and organotrialkoxysilane.

[0137] The water- and oil-repellent surfactant is, for example, a fluororesin surfactant or a silicone resin surfactant.

[0138] The fluororesin surfactant is a surfactant containing the above-mentioned fluororesin. The type of the fluororesin surfactant is not particularly limited, and may be any of a nonionic fluororesin surfactant, anionic fluorosurfactant, cationic fluorosurfactant, and amphoteric fluorosurfactant.

[0139] The silicone resin surfactant is a surfactant containing the above-mentioned silicone resin. The type of silicone resin surfactant is not particularly limited, and may be any of a nonionic silicone resin surfactant, an anionic silicone resin surfactant, a cationic silicone resin surfactant, and an amphoteric silicone resin surfactant.

[0140] The antifouling coating composition may further comprise a plurality of second particles.

[0141] The shape of each of the plurality of second particles is spherical, which means a perfect sphere, an ellipsoid, or an oval shape.

[0142] The average particle size of the second particles may be on the order of nanometers, for example, 10 nm to 200 nm, or 30 nm to 150 nm, or 50 nm to 100 nm.

[0143] That is, the average particle size of the plurality of second particles is significantly smaller than the average particle size of the plurality of first particles 22 .

[0144] The second particles are composed of at least one of inorganic particles and polymer particles. More specifically, the second particles are composed of inorganic particles, and here, as an example, silica particles.

[0145] On the surface of the antifouling coating film formed by using an antifouling coating composition containing such a plurality of second particles, fine irregularities smaller than the irregularities caused by the plurality of first particles are provided. When such fine irregularities are provided, the contact area between dirt and the surface of the antifouling coating film 20 is reduced. Therefore, dirt is less likely to adhere to the surface of the antifouling coating film 20, which means that high antifouling properties can be achieved.

[0146] When the antifouling coating composition comprises a conductive material, a water- and oil-repellent resin, a water- and oil-repellent surfactant, or a plurality of second particles, the binder resin 21 also binds and holds the conductive material, the water- and oil-repellent resin, the water- and oil-repellent surfactant, or a plurality of second particles in the antifouling coating film.

[0147] The antifouling coating composition may further comprise a solvent. The solvent is not particularly limited, but from the viewpoint of improving the dispersibility of the plurality of first particles, the binder resin, etc., an organic solvent is preferably used.

[0148] The antifouling coating composition may further comprise components other than those mentioned above.

[0149] Examples of the other components include additives such as leveling agents, antifoaming agents, surface conditioners, pH adjusters, thickeners, dispersants, heat stabilizers, and ultraviolet absorbers.

[0150] [Summary, etc.] As described above, the antifouling coating composition comprises a plurality of spherical first particles 22 and a binder resin. In the antifouling coating film 20 formed from the antifouling coating composition, the maximum height Rz is 5 μm or more and 20 μm or less, and the 60-degree gloss is 20% or less.

[0151] The antifouling coating composition includes a plurality of first particles 22 and has a maximum height Rz of 5 μm or more, which allows sufficient light scattering on the uneven surface, resulting in an antifouling coating film 20 with a 60-degree gloss of 20% or less and a high matte finish.

[0152] Furthermore, in unevenness having a maximum height Rz of 20 μm or less, in other words, unevenness of a size sufficiently small from the viewpoint of antifouling properties, dirt is difficult to adhere, and even if dirt adheres to the recesses, this dirt is easily removed. Furthermore, the plurality of first particles 22 having a spherical shape do not have protrusions or the like that easily catch dirt, so dirt is even more difficult to adhere. In other words, sufficient antifouling properties can be achieved.

[0153] In summary, in this embodiment, an antifouling coating composition having both matte properties and antifouling properties is realized.

[0154] Furthermore, for example, the average particle diameter of the plurality of first particles 22 is equal to or greater than 3 μm and less than 7 μm.

[0155] This makes it easy to set the maximum height Rz of the antifouling coating film 20 in the above-mentioned range of 5 μm or more and 20 μm or less, and therefore makes it easy to realize an antifouling coating composition that has both matte properties and antifouling properties.

[0156] Furthermore, for example, the plurality of first particles 22 are made of at least one of silicone resin particles, PTFE particles, wax particles, and acrylic resin particles.

[0157] Silicone resin particles, PTFE particles, wax particles, and acrylic resin particles are all particles with slipperiness. By using such particles, dirt is less likely to adhere to the uneven surface, and even if dirt does adhere to the recessed parts, this dirt can be more easily removed. Therefore, even higher stain resistance can be achieved.

[0158] Also, for example, the antifouling coating composition further comprises a conductive material, and the surface resistivity of the antifouling coating film 20 is less than 10 13 Ω / Sq.

[0159] When the surface resistivity of the antifouling coating film 20 is within the above range, the antifouling coating film 20 has antistatic properties. In such an antifouling coating film 20, adhesion of electrostatic stains such as dust can be further suppressed. Therefore, even higher antifouling properties can be achieved.

[0160] Moreover, for example, the antifouling coating composition further comprises a water- and oil-repellent resin or a water- and oil-repellent surfactant.

[0161] This provides the surface of the antifouling coating film 20 with water and oil repellency, making it even more difficult for dirt to adhere to the surface and making it even easier to remove any dirt that does adhere. As a result, even higher antifouling properties are achieved.

[0162] Furthermore, for example, the antifouling coating composition further comprises a plurality of spherical second particles, and the average particle size of the plurality of second particles is 10 nm or more and 200 nm or less.

[0163] This results in small, fine irregularities on the surface of the antifouling coating film 20. When such fine irregularities are provided, the contact area between dirt and the surface of the antifouling coating film 20 is reduced. This makes it even more difficult for dirt to adhere, thereby achieving even higher antifouling properties.

[0164] Furthermore, for example, the antifouling coating composition for lighting fixtures is the antifouling coating composition described above that is used for lighting fixtures 100.

[0165] An antifouling coating composition having both matte and antifouling properties can be utilized for the lighting fixture 100.

[0166] Furthermore, for example, the lighting fixture 100 includes a member having an antifouling coating film for lighting fixtures formed by applying the above-described antifouling coating composition for lighting fixtures.

[0167] This allows the member (light reflecting member 300) to have both a matte finish and stain resistance, thereby providing the lighting device 100 with both high designability and stain resistance.

[0168] Furthermore, for example, an indoor lighting fixture is the above-described lighting fixture 100 that is used indoors.

[0169] When the lighting fixture 100 is used indoors, it is often cleaned by wiping, so it is highly valuable that the antifouling coating film 20 has high antifouling properties in a stain wiping test.

[0170] Moreover, for example, the antifouling coating film 20 is a film formed by using the antifouling coating composition described above.

[0171] The antifouling coating composition includes a plurality of first particles 22 and has a maximum height Rz of 5 μm or more, which allows sufficient light scattering on the uneven surface, resulting in an antifouling coating film 20 with a 60-degree gloss of 20% or less and a high matte finish.

[0172] Furthermore, in unevenness having a maximum height Rz of 20 μm or less, in other words, unevenness of a size sufficiently small from the viewpoint of antifouling properties, dirt is difficult to adhere, and even if dirt adheres to the recesses, this dirt is easily removed. Furthermore, the plurality of first particles 22 having a spherical shape do not have protrusions or the like that easily catch dirt, so dirt is even more difficult to adhere. In other words, sufficient antifouling properties can be achieved.

[0173] In summary, in this embodiment, an antifouling coating film 20 having both matte properties and antifouling properties is realized.

[0174] (Other embodiments) Although the embodiments have been described above, the present invention is not limited to the above-described embodiments.

[0175] In addition, the present invention also includes forms obtained by making various modifications to the embodiments that a person skilled in the art would think of, or forms realized by arbitrarily combining the components and functions of the embodiments within the scope that does not deviate from the spirit of the present invention. [Explanation of symbols]

[0176] 20 Antifouling coating 21 Binder resin 22 1st particle 100 lighting fixtures

Claims

1. An antifouling coating film formed from an antifouling coating composition for lighting fixtures, The antifouling coating composition for lighting fixtures comprises a plurality of spherical first particles; A binder resin, Equipped with the solid content of the plurality of first particles is 5 parts by mass or more and 95 parts by mass or less, when the solid content of the binder resin is 100 parts by mass; the binder resin is an acrylic polyol resin, In the antifouling coating film formed by the antifouling coating composition for lighting fixtures, The maximum height Rz is 5 μm or more and 20 μm or less, The 60-degree gloss is 20% or less, an average particle size of the plurality of first particles is 3 μm or more and less than 7 μm; The plurality of first particles are composed of at least one of silicone resin particles, PTFE particles, wax particles, and acrylic resin particles. Antifouling coating.

2. The antifouling coating composition for lighting fixtures further comprises a water- and oil-repellent resin or a water- and oil-repellent surfactant. The antifouling coating film according to claim 1.

3. A member having an antifouling coating film formed by the antifouling coating composition, The antifouling coating composition comprises: a plurality of spherical first particles; A binder resin, Equipped with the solid content of the plurality of first particles is 5 parts by mass or more and 95 parts by mass or less, when the solid content of the binder resin is 100 parts by mass; the binder resin is an acrylic polyol resin, In the antifouling coating film formed by the antifouling coating composition, The maximum height Rz is 5 μm or more and 20 μm or less, The 60-degree gloss is 20% or less, an average particle size of the plurality of first particles is 3 μm or more and less than 7 μm; The plurality of first particles are composed of at least one of silicone resin particles, PTFE particles, wax particles, and acrylic resin particles. Lighting fixtures.

4. The lighting fixture according to claim 3 is used indoors. Indoor lighting fixtures.

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