Water-related component

Abstract

To provide a water-related component that achieves both cleanability and aesthetic appeal.SOLUTION: A component arranged in a water-related area comprises a transparent layer having an uneven surface. The surface of the transparent layer has an Ra value from 1.0 to 4.0 inclusive, an Rsk value from 0.0 to 1.4 inclusive, and an Rku value of 3.0 or more.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] FIELD OF THE INVENTION Aspects of the present invention generally relate to plumbing components. [Background technology]

[0002] In plumbing components, the design can be improved by creating a frosted appearance that is matte yet has a sense of depth. One method for achieving a frosted appearance is, for example, to form a transparent layer and polish the surface of the transparent layer to create irregularities on the surface. However, polishing the surface of the transparent layer can allow dirt to get into the irregularities created by polishing, which can make the surface less easy to clean. Furthermore, polishing can create irregularities that are shallow enough to prevent dirt from getting in, which can make it impossible to achieve a frosted appearance. It is desirable to achieve both easy cleaning and the design of a frosted appearance in plumbing components. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 7082313 Summary of the Invention [Problem to be solved by the invention]

[0004] The present invention has been made based on the recognition of the above problem, and aims to provide a bathroom component that is both easy to clean and has a good design. [Means for solving the problem]

[0005] The first invention is a component to be placed in a wet area, comprising a transparent layer having an uneven surface, the Ra value of the surface of the transparent layer being 1.0 or more and 4.0 or less, the Rsk value of the surface of the transparent layer being 0.0 or more and 1.4 or less, and the Rku value of the surface of the transparent layer being 3.0 or more.

[0006] This bathroom component provides a sense of depth by providing a transparent layer. Furthermore, the surface Ra value of the transparent layer is 1.0 to 4.0, the surface Rsk value of the transparent layer is 0.0 to 1.4, and the surface Rku value of the transparent layer is 3.0 or greater. This allows for the formation of unevenness necessary for a matte frosted appearance while preventing excessive dirt from penetrating into the unevenness, improving cleanability. Therefore, both cleanability and design are achieved.

[0007] A second invention is a water-related member according to the first invention, wherein the transparent layer contains at least one of acrylic resin, polyethylene terephthalate, polycarbonate, transparent vinyl chloride, polypropylene, and epoxy resin.

[0008] According to this plumbing component, the transparent layer contains at least one of acrylic resin, polyethylene terephthalate, polycarbonate, transparent vinyl chloride, polypropylene, and epoxy resin, thereby increasing the durability of the transparent layer. This makes it resistant to scratches and dirt, allowing it to maintain its beautiful condition even after long-term use. Furthermore, the transparent layer contains these resins, making it resistant to water and moisture, and suppressing deformation and corrosion caused by moisture.

[0009] The third invention is a water-related component according to the first or second invention, wherein the transparent layer has a surface layer having the irregularities and a base layer located on the back side of the surface layer, the surface layer includes a coating film containing a resin and particles dispersed inside the coating film, and the irregularities are formed by the particles.

[0010] According to this bathroom component, the transparent layer has a surface layer and a base layer, which makes it easier to achieve a sense of depth and a frosted appearance. Furthermore, the particles contained in the surface layer form irregularities, which makes it easier to impart desired Ra, Rsk, and Rku values ​​to the surface of the transparent layer (the surface of the surface layer) compared to forming irregularities by roughening the surface through polishing or grinding. Furthermore, the particles contained in the surface layer form irregularities, which makes it possible to form a more stable and uniform irregular shape compared to forming irregularities by roughening the surface through polishing or grinding, thereby improving yield. Furthermore, when irregularities are formed using a resin-containing coating film and particles dispersed within the coating film, the irregular shape can be easily controlled by the amount of coating film and the size of the dispersed particles compared to forming irregularities by roughening the surface through mold transfer or grinding.

[0011] A fourth invention is the plumbing member according to the third invention, wherein the surface layer has a pencil hardness of 1H or more.

[0012] According to this plumbing member, the pencil hardness of the surface layer is 1H or more, which increases the durability of the surface layer. As a result, the unevenness of the surface of the transparent layer (the surface of the surface layer) is less likely to be damaged even if cleaning by sliding is repeated.

[0013] A fifth invention is the wet-related member according to the third invention, wherein the surface layer contains a hydrophilic compound containing at least one of an anionic functional group and a zwitterionic functional group.

[0014] According to this water-related component, the surface layer contains a hydrophilic compound containing at least one of an anionic functional group and a zwitterionic functional group, which imparts hydrophilicity to the surface layer and reduces the contact angle of the surface layer with water. This makes it easier for water droplets to collapse, making water stains less noticeable even after drying. Furthermore, if the base material has a drainage gradient, water droplets spread over a wide area, making it easier to form drainage paths and allowing water to be drained quickly. [Effects of the Invention]

[0015] According to the aspects of the present invention, it is possible to provide a bathroom component that is both easy to clean and has a good design. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 2 is a perspective view showing a water-related member according to the embodiment. [Figure 2] 1 is a cross-sectional view schematically illustrating the vicinity of a surface of a water-related member according to an embodiment. [Figure 3] 3(a) to 3(c) are explanatory diagrams of the Ra value. [Figure 4] 4(a) to 4(c) are explanatory diagrams of the Rsk value. [Figure 5] 5(a) and 5(b) are diagrams illustrating the Rku value. [Figure 6] 1 is a table showing the results of Examples and Comparative Examples. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, embodiments will be described with reference to the drawings. In the drawings, like components are designated by like reference numerals, and detailed descriptions thereof will be omitted where appropriate.

[0018] FIG. 1 is a perspective view showing a plumbing member according to an embodiment. FIG. 2 is a cross-sectional view that schematically shows the vicinity of the surface of the plumbing member according to the embodiment. 1 and 2, a plumbing member 100 according to an embodiment includes, for example, a base material 10 and a transparent layer 20. The plumbing member 100 has a structure in which the base material 10 is covered with the transparent layer 20, for example. The plumbing member 100 does not necessarily have to include the base material 10. The plumbing member 100 may have, for example, only the transparent layer 20.

[0019] In the present invention, plumbing components 100 refer to components used in toilets, bathrooms, kitchens, vanities, etc. Examples of plumbing components 100 include, but are not limited to, bathroom wall materials, bathroom floor materials, bathroom counters, bathroom door materials, bathtubs, bathtub rims, bathroom window materials, bathroom door materials, shower booth wall materials, wash mirrors, vanities, wash bowls, kitchen counters, kitchen doors, storage shelves, storage boards, toilet bowls, toilet seats, warm water washing toilet seats and their cleaning nozzles, drains, faucets, range hood materials, etc.

[0020] The substrate 10 is, for example, a portion of the plumbing member 100 that is covered with the transparent layer 20. The substrate 10 provides, for example, rigidity to the plumbing member 100. The substrate 10 includes, for example, at least one of metal, ceramic, resin, wood, glass, and rubber.

[0021] The transparent layer 20 covers the surface 10a of the base material 10. The transparent layer 20 has unevenness on the surface 20a. The transparent layer 20 is provided on the outermost surface of the bathroom fixture 100. The surface 20a of the transparent layer 20 forms the surface 100a of the bathroom fixture 100.

[0022] The transparent layer 20 includes, for example, at least one of acrylic resin, polyethylene terephthalate, polycarbonate, transparent vinyl chloride, polypropylene, and epoxy resin.

[0023] The transparent layer 20 has a surface layer 21 and a base layer 22. The surface layer 21 is provided on the outermost surface of the transparent layer 20. The surface 21a of the surface layer 21 constitutes the surface 20a of the transparent layer 20. The surface 21a of the surface layer 21 has irregularities. The base layer 22 is located on the back side of the surface layer 21. In the bathroom component 100, the base layer 22 is located between the substrate 10 and the surface layer 21. The base layer 22 is provided as needed and can be omitted.

[0024] The thickness T1 of the surface layer 21 is, for example, 0.1 μm or more and 100 μm or less, preferably 1 μm or more and 50 μm or less, and more preferably 5 μm or more and 25 μm or less. The thickness T2 of the base layer 22 is, for example, 1 mm or more and 20 mm or less. The thickness of the transparent layer 20 is expressed, for example, as the sum of the thickness T1 and the thickness T2. When the base layer 22 is omitted, the thickness of the transparent layer 20 is, for example, the same as the thickness T1. The thickness of each layer can be determined, for example, by observing the cross section of each layer with a microscope or measuring the film thickness of each layer.

[0025] The surface layer 21 has, for example, a coating film 211 and particles 212. The particles 212 are dispersed inside the coating film 211. The unevenness of the surface 20a of the transparent layer 20 (the unevenness of the surface 21a of the surface layer 21) is formed by the particles 212. Portions of the coating film 211 located above the particles 212 constitute, for example, convex portions of the unevenness. Portions of the coating film 211 not located above the particles 212 constitute, for example, concave portions of the unevenness. The unevenness will be described later.

[0026] The coating film 211 contains a resin. The coating film 211 contains, for example, at least one of acrylic resin, polyethylene terephthalate, polycarbonate, transparent vinyl chloride, polypropylene, and epoxy resin. The main component of the coating film 211 is, for example, an organic substance, preferably an acrylic resin. Here, the main component refers to a component that accounts for more than half of the volume of the components contained in the coating film 211. The particles 212 may be, for example, organic or inorganic particles, and include at least one of glass, silica, acrylic resin, polyethylene terephthalate, polycarbonate, transparent vinyl chloride, polypropylene, and epoxy resin. Furthermore, in consideration of adhesion to the coating film, it is more preferable that the particles 212 have the same component as the coating film 211. The average particle size of the particles 212 is, for example, 5 μm or more and 30 μm or less. The amount of the particles 212 added is, for example, 1 wt % or more and 20 wt % or less of the materials other than the particles 212 in the surface layer 21. The particles 212 are added as needed and can be omitted.

[0027] The base layer 22 includes a resin, such as at least one of an acrylic resin, polyethylene terephthalate, polycarbonate, transparent vinyl chloride, polypropylene, and an epoxy resin.

[0028] The plumbing member 100 further includes a colored layer 30. The colored layer 30 is located between the substrate 10 and the transparent layer 20. More specifically, the colored layer 30 is located between the substrate 10 and the base layer 22. If the base layer 22 is omitted, the colored layer 30 is located, for example, between the substrate 10 and the surface layer 21. The colored layer 30 includes, for example, a resin and a colorant. The resin in the colored layer 30 includes at least one of acrylic resin, epoxy resin, urethane resin, silicone resin, and fluororesin. The colored layer 30 includes, for example, at least one of titanium, carbon black, iron oxide, calcium carbonate, baryte powder, talc, aluminum powder, and zinc compounds such as zinc sulfide and zinc oxide. The thickness T3 of the colored layer 30 is, for example, 1 μm or more and 50 μm or less. The colored layer 30 is provided as needed and can be omitted.

[0029] The unevenness of the surface 20a of the transparent layer 20 will be described in more detail below. 3(a) to 3(c) are explanatory diagrams of the Ra value. 4(a) to 4(c) are explanatory diagrams of the Rsk value. 5(a) and 5(b) are diagrams illustrating the Rku value. Fig. 3(a) shows a schematic representation of a state where the Ra value is less than 1.0, Fig. 3(b) shows a schematic representation of a state where the Ra value is 1.0 or more and 4.0 or less, and Fig. 3(c) shows a schematic representation of a state where the Ra value is more than 4.0. Figure 4(a) shows a schematic representation of the state where the Rsk value is less than 0.0, Figure 4(b) shows a schematic representation of the state where the Rsk value is between 0.0 and 1.4, and Figure 4(c) shows a state where the Rsk value is greater than 1.4. Fig. 5(a) schematically shows a state where the Rku value is less than 3.0, and Fig. 5(b) schematically shows a state where the Rku value is 3.0 or more.

[0030] The Ra value is the arithmetic mean roughness. As shown in Figures 3(a) to 3(c), the Ra value represents the size of the unevenness. The larger the Ra value, the greater the vertical displacement of the unevenness. In the bathroom component 100, the Ra value of the surface 20a of the transparent layer 20 is 1.0 or more and 4.0 or less. The Ra value of the surface 20a of the transparent layer 20 is preferably 2.0 or more and 3.6 or less.

[0031] The Rsk value is the skewness of the roughness curve. As shown in Figures 4(a) to 4(c), the Rsk value indicates whether the unevenness is upwardly convex or downwardly convex. When the Rsk value exceeds 0, the unevenness is upwardly convex. When the Rsk value is less than 0, the unevenness is downwardly convex. In the bathroom component 100, the Rsk value of the surface 20a of the transparent layer 20 is 0.0 or more and 1.4 or less. The Rsk value of the surface 20a of the transparent layer 20 is preferably 0.5 or more and 1.2 or less.

[0032] The Rku value is the kurtosis of the roughness curve. As shown in Figures 5(a) and 5(b), the Rku value represents the sharpness of the tips of the asperities. When the Rku value exceeds 3, the tips of the asperities are sharp. When the Rku value is 3 or less, the tips of the asperities are not sharp. In the bathroom component 100, the Rku value of the surface 20a of the transparent layer 20 is 3.0 or more. The Rku value of the surface 20a of the transparent layer 20 is preferably 3.2 or more.

[0033] The Ra value, Rsk value, and Rku value are measured in accordance with JIS B 0601: 2013. The Ra value, Rsk value, and Rku value can be measured using, for example, SURFCOM NEX 201 DX2-23 manufactured by ACCRETECH.

[0034] For example, when the surface layer 21 contains particles 212, the Ra value, Rsk value, and Rku value can be set to desired values ​​by adjusting the type, average particle size, and amount of the particles 212, the film thickness of the coating film 211, etc. Furthermore, when the surface layer 21 does not contain particles 212, the Ra value, Rsk value, and Rku value can be set to desired values ​​by adjusting the shape of the mold that forms the surface of the transparent layer 20, etc.

[0035] The clarity of the transparent layer 20 is preferably 60% or less, and more preferably 40% or less. The clarity can be measured using Haze-gard i manufactured by BYK.

[0036] For example, the clarity can be adjusted to a desired value by adjusting the thickness of the transparent layer 20 (surface layer 21). Furthermore, for example, when the surface layer 21 contains particles 212, the image sharpness can be adjusted to a desired value by adjusting the type, average particle size, amount of added particles 212, etc.

[0037] The pencil hardness of the surface layer 21 is preferably 1H or more, and more preferably 5H or more. The pencil hardness is measured in accordance with JIS K 5600-5-4:1999. The pencil hardness can be measured, for example, using a KT-VF2391 manufactured by TQC Sheen Co., Ltd. For example, the pencil hardness of the surface layer 21 can be made 1H or more by the coating film 211 of the surface layer 21 containing at least one of an acrylic resin and an epoxy resin.

[0038] The surface 20a of the transparent layer 20 is preferably hydrophilic. A method for imparting hydrophilicity to the surface 20a of the transparent layer 20 is not particularly limited, but may include a method of forming a hydrophilic surface layer 21 on the surface 20a of the transparent layer 20. For example, the surface layer 21 can be made hydrophilic by including a hydrophilic compound in the surface layer 21. The hydrophilic compound includes, for example, at least one of an anionic functional group and a zwitterionic functional group. The zwitterionic functional group includes both an anionic functional group and a cationic functional group.

[0039] Examples of anionic functional groups include sulfonic acid groups, sulfonate groups, carboxyl groups, and phosphate groups. Among anionic functional groups, sulfonic acid groups and sulfonate groups are preferred due to their high polarity, which is an important factor in achieving hydrophilicity. The surface layer 21 preferably contains more sulfonic acid groups or sulfonate groups on the surface side than on the inner side. Furthermore, the surface layer 21 more preferably has sulfonic acid groups or sulfonate groups segregated on the surface side. This allows the surface layer 21 to exhibit high hydrophilicity and maintain that hydrophilicity for a long period of time. The presence of sulfonic acid groups or sulfonate groups in the surface layer 21 can be determined by surface analysis using X-ray photoelectron spectroscopy (XPS). XPS can detect the amount of sulfonic acid groups or sulfonate groups present on the surface of the surface layer 21. Specifically, sulfonic acid groups can be identified from the chemical shift of the 2p orbital peak of sulfur (S) element detected by XPS.

[0040] Specific examples of compounds having at least one of a sulfonic acid group and a sulfonate salt group include 2-((meth)acryloyloxy)ethanesulfonic acid, 3-((meth)acryloyloxy)propane-1-sulfonic acid, sodium or potassium salts of acrylamido tertiary butyl sulfonic acid, methallyl sulfonic acid, sodium or potassium salts of p-styrenesulfonic acid, alkylsulfosuccinic acid alkenyl ether salts, polyoxyethylene (meth)acrylate sulfate ester salts, alkylsulfosuccinic acid alkenyl ester salts, and glycerol-1-allyl-3-alkylphenyl-2-polyoxyethylene sulfate. Particularly preferred compounds having at least one of a sulfonic acid group and a sulfonate salt group are linear alkylsulfonic acids having a (meth)acryloyloxy group and their salts, 2-((meth)acryloyloxy)ethanesulfonic acid and 3-((meth)acryloyloxy)propane-1-sulfonic acid. This allows for a highly durable coating film.

[0041] A known hydrophilic paint can be used as the paint for forming the hydrophilic surface layer 21. For example, the paints described in JP 2015-212324 A, JP 2014-218612 A, JP 2014-198754 A, and JP 2014-111745 A can be used.

[0042] The contact angle of the surface layer 21 with water is preferably 45° or less, more preferably 20° or less. The contact angle with water is measured in accordance with JIS R 3257:1999. The contact angle with water can be measured, for example, using an automatic contact angle meter DM-701 manufactured by Kyowa Interface Science Co., Ltd. The contact angle with water is calculated, for example, as the average value of measurements at multiple locations. For example, by forming a hydrophilic surface layer 21, the contact angle of the surface layer 21 with water can be set to 45° or less.

[0043] A primer layer (not shown) may be provided between the surface layer 21 and the base layer 22 to improve adhesion of the surface layer 21 to the base layer 22 and to enhance the design. When a primer layer is provided, the primer layer contains, for example, a resin. The primer layer contains, for example, at least one of an acrylic resin, an ethylene vinyl acetate resin, a urethane resin, an epoxy resin, a vinyl chloride-vinyl acetate copolymer resin, a silicone-modified urethane resin, a chlorinated polypropylene resin, a silane resin, and a vinyl acetate resin. The primer layer preferably contains, for example, a vinyl chloride-vinyl acetate copolymer resin. By including a vinyl chloride-vinyl acetate copolymer resin in the primer layer, it is possible to achieve both the toughness and chemical resistance of vinyl chloride and the adhesion of the surface layer 21 to the base layer 22 due to the adhesiveness and plasticity of vinyl acetate. Furthermore, providing a primer layer containing glitter can improve the design of the bathroom fixture 100.

[0044] The plumbing member 100 can be manufactured, for example, by the following procedure. First, a base layer 22 is prepared. Next, a surface layer 21 is provided on the surface of the base layer 22 by spray painting or the like, and a colored layer 30 is provided on the back surface (the surface opposite to the front surface) of the base layer 22 by spray painting or the like, thereby producing a surface member. Next, the surface member is attached to the surface of the base material 10. In this way, a plumbing member 100 is manufactured in which the base material 10 is covered with the colored layer 30 and the transparent layer 20. Note that the formation of the colored layer 30 and base layer 22 can be omitted. When the colored layer 30 and base layer 22 are omitted, a surface layer 21 is provided on the surface of the base material 10 by spray painting or the like.

[0045] The surface layer 21 may also be formed by molding. The molding method may be injection molding, vacuum molding, a molding method in which a sheet is pressed against a mold, or casting. Vacuum molding is a molding method in which a heated sheet is vacuumed and pressed against a mold. Cast molding is a molding method in which a molten resin is poured into a mold. When the surface layer 21 is formed by molding, for example, the base layer 22 may be omitted. In this case, a molded body of the surface layer 21 is produced, and the surface layer 21 is attached to the surface of the base material 10, thereby producing the plumbing member 100 in which the base material 10 is covered with the transparent layer 20 (surface layer 21). For example, a mold capable of transferring the desired surface irregularities may be prepared, and the surface layer 21 may be formed by injection molding, cast molding, or the like. Furthermore, for example, when the base material 10 is omitted, the molded body of the transparent layer 20 (surface layer 21) becomes the plumbing member 100.

[0046] The following describes the effects of the plumbing member 100 according to the embodiment. In order to improve the design of plumbing components, it is required to have a matte yet frosted appearance that gives a sense of depth. One method for achieving a frosted appearance is to form a transparent layer on the surface of a substrate and then polish the surface of the transparent layer to form irregularities on the surface. However, polishing the surface of the transparent layer may allow dirt to enter the irregularities formed by polishing, which may make it difficult to clean. Furthermore, if the polishing process forms irregularities that are shallow enough to prevent dirt from entering, it may be impossible to achieve a frosted appearance. It is required to achieve both easy cleaning and the design of a frosted appearance in plumbing components.

[0047] In contrast, in the bathroom fixture 100 according to the embodiment, a sense of depth can be achieved by providing a transparent layer 20 that covers the base material 10. Furthermore, the Ra value of the surface 20a of the transparent layer 20 is 1.0 or more and 4.0 or less, the Rsk value of the surface 20a of the transparent layer 20 is 0.0 or more and 1.4 or less, and the Rku value of the surface 20a of the transparent layer 20 is 3.0 or more. This allows for the formation of unevenness for the matte finish required for a frosted appearance while preventing excessive penetration of dirt into the unevenness, thereby improving cleanability. Therefore, both cleanability and design can be achieved.

[0048] Furthermore, in the plumbing member 100, the transparent layer 20 contains at least one of acrylic resin, polyethylene terephthalate, polycarbonate, transparent vinyl chloride, polypropylene, and epoxy resin, thereby increasing the durability of the transparent layer 20. This makes it resistant to scratches and dirt, allowing it to maintain its beautiful condition even after long-term use. Furthermore, the transparent layer 20 containing these resins is resistant to water and moisture, and deformation and corrosion due to moisture can be suppressed.

[0049] Furthermore, in the bathroom fixture 100, the transparent layer 20 includes a surface layer 21 and a base layer 22, which facilitates the creation of a sense of depth and a frosted appearance. Furthermore, the particles 212 contained in the surface layer 21 form irregularities, which makes it easier to impart desired Ra, Rsk, and Rku values ​​to the surface 20a of the transparent layer 20 (the surface 21a of the surface layer 21) compared to forming irregularities by roughening the surface through polishing or grinding. Furthermore, the particles 212 contained in the surface layer 21 form irregularities, which allows for the formation of a more stable and uniform irregular shape compared to forming irregularities by roughening the surface through polishing or grinding, thereby improving yield. Furthermore, when irregularities are formed using a resin-containing coating film 211 and particles 212 dispersed within the coating film 211, the irregular shape can be more easily controlled by the amount of coating film and the size of the dispersed particles 212 compared to forming irregularities by roughening the surface through mold transfer or grinding.

[0050] Furthermore, in the bathroom component 100, the pencil hardness of the surface layer 21 is 1H or more, which increases the durability of the surface layer 21. This makes it difficult for the unevenness of the surface 20a of the transparent layer 20 (the surface 21a of the surface layer 21) to be damaged even if cleaning by sliding is repeated.

[0051] Furthermore, in the plumbing member 100, the surface layer 21 contains a hydrophilic compound containing at least one of an anionic functional group and a zwitterionic functional group, which imparts hydrophilicity to the surface layer 21 and reduces the contact angle of the surface layer 21 with water. This makes it easier for water droplets to collapse, making water stains less noticeable even after drying. Furthermore, if a drainage gradient is provided on the base material 10, water droplets spread over a wide area, making it easier to form drainage paths and allowing water to be drained quickly.

[0052] Furthermore, in the bathroom component 100, by setting the thickness T1 of the surface layer 21 to be 0.1 μm or more and 100 μm or less, the hydrophilicity can be exhibited well and the adhesion between the base layer 22 and the substrate 10 and the hydrophilic surface layer 21 can be improved.

[0053] Furthermore, in the plumbing member 100, the main component of the coating film 211 is acrylic resin, which makes it difficult for water stains to adhere to the surface 21a of the surface layer 21.

[0054] Furthermore, the desired surface unevenness can be easily obtained by applying surface unevenness to the plumbing component 100 through post-treatment such as spray painting. When applying unevenness through painting, it is also possible to obtain a desired surface appearance design by adding glitter or the like within a range that does not affect the surface unevenness.

[0055] <Examples and Comparative Examples> (Sample preparation) Samples were prepared as follows. First, Composition 1 was prepared by stirring a solution containing dipentaerythritol hexaacrylate (7 g) as a resin, Omnirad 500 (0.14 g) as a photopolymerization initiator, and methoxyethanol (15 g) as a solvent with a stirrer for 60 minutes. Omnirad 500 is a mixture of 1-hydroxycyclohexyl phenyl ketone and benzophenone in a 1:1 weight ratio. Next, Composition 2 was prepared by adding the particles and glitter shown in Figure 6 to Composition 1 in the amounts shown in Figure 6. The particles used were ART PEARL SE-020T, SE-0505T, SE-090T, or J-3PY manufactured by Negami Chemical Industrial Co., Ltd. The glitter used was LG neo Silver #500 manufactured by Oike Industrial Co., Ltd. The amounts added in Figure 6 are expressed as weight percent of Composition 1. In the sample without particles, the addition of particles was omitted, and in the sample without glitter, the addition of glitter was omitted.

[0056] Next, an acrylic plate (Acrylite EX (registered trademark) manufactured by Mitsubishi Chemical Corporation) (size: 100 x 100 x 2) mainly composed of polymethyl methacrylate (PMMA) was prepared as a substrate. The above composition 2 was spray-coated on the surface of the substrate to prepare a coated substrate. Note that for samples without added particles or glitter, the above composition 1 was spray-coated on the surface of the substrate to prepare a coated substrate. Next, the coated substrate was quickly placed in a hot air drying oven (DKN402 manufactured by Yamato Scientific Co., Ltd.) and heated at a drying temperature of 60°C for 6 minutes to volatilize the solvent and prepare a dried substrate. Next, the dried substrate was removed from the hot air drying oven and cured with an ultraviolet curing device (ANUP4154 manufactured by Panasonic Electric Works Co., Ltd.) with an integrated light exposure of 1000 mJ / cm2. 2 The resin was cured by irradiating it with ultraviolet light of 1000 kJ / cm 2 , and a transparent layer was formed on the surface of the substrate to prepare a sample.

[0057] In Comparative Examples 6, 12, and 13, no transparent layer was formed on the substrate, and the substrate was subjected to surface polishing using buffs of #100, #800, and #400, respectively, to prepare samples.

[0058] (Calculation of the thickness of the transparent layer when the surface is formed by painting) The thickness of the transparent layer was calculated by the following formula: In the examples and comparative examples, the density of the transparent layer was "1.0 g / cm 3 The results are shown in Figure 6. Thickness of transparent layer (μm) = {(mass of substrate after coating (g)) - (mass of substrate before coating (g))} ÷ (area of ​​substrate (cm 2 ))÷(density of transparent layer (g / cm 3 ))×10 4

[0059] (Measurement of parameters that represent the surface condition of the transparent layer) The parameters representing the surface condition of the transparent layer were measured as follows. Using a SURFCOM NEX 201 DX2-23 manufactured by ACCRETECH, the Ra, Rsk, and Rku values ​​of the surface of the transparent layer of the sample prepared as described above were measured in accordance with JIS B 0633:2001. The results are shown in Figure 6.

[0060] (Evaluation of cleanability) The cleaning performance was evaluated as follows. First, black carbon-added petrolatum (a mixture of 4 parts petrolatum and 3 parts black carbon) was applied to a predetermined area (20 mm × 20 mm) of the surface of the sample prepared as described above. Next, 2.5 g of neutral detergent was dropped onto the petrolatum-adhered area of ​​the sample, and the sample was subjected to 20 scrubbing strokes using a 75 mm × 75 mm sponge with a 200 g load. Next, the front and back surfaces of the sample were rinsed with 100 mL of water per side, the back surface was wiped, and the surface was sprayed with air for 5 seconds to remove water droplets. The presence or absence of petrolatum remaining on the surface was visually confirmed. A sample with no visible petrolatum was rated "pass," and a sample with visible petrolatum was rated "fail." The results are shown in Figure 6.

[0061] (Design evaluation) The design was evaluated as follows. Using a BYK Haze-gard i, the clarity (C) of the transparent layer of the sample prepared as described above was measured. Clarity of 60% or less was rated as "pass," and clarity of more than 60% was rated as "fail." The results are shown in Figure 6.

[0062] As shown in Figure 6, in Examples 1 to 12, in which the surface Ra value of the transparent layer was 1.0 or more and 4.0 or less, the surface Rsk value of the transparent layer was 0.0 or more and 1.4 or less, and the surface Rku value of the transparent layer was 3.0 or more, both the cleanability and the design were "passed." In contrast, in Comparative Example 1, in which the surface Ra value of the transparent layer was less than 1.0, Comparative Example 2, in which the surface Ra value of the transparent layer was greater than 4.0, Comparative Examples 5 and 7, in which the surface Rsk value of the transparent layer was greater than 1.4, and Comparative Examples 14 and 15, in which the surface Ra value of the transparent layer was less than 1.0 and the surface Rsk value of the transparent layer was less than 0.0, the cleanability was "passed" but the design was "failed." Furthermore, in Comparative Example 6, in which the surface Rsk value of the transparent layer was less than 0.0, the design was "passed" but the cleanability was "failed." Furthermore, in Comparative Examples 3 and 4, in which the Ra value of the surface of the transparent layer exceeded 4.0, in Comparative Examples 8, 9, 10, and 11, in which the Ra value of the surface of the transparent layer exceeded 4.0 and the Rku value of the surface of the transparent layer was less than 3.0, and in Comparative Examples 12 and 13, in which the Ra value of the surface of the transparent layer was less than 1.0 and the Rsk value of the surface of the transparent layer was less than 0.0, both the cleanability and the design were "failed."

[0063] This suggests that if the Ra value of the surface of the transparent layer is 1.0 or more and 4.0 or less, the Rsk value of the surface of the transparent layer is 0.0 or more and 1.4 or less, and the Rku value of the surface of the transparent layer is 3.0 or more, both cleanability and design can be achieved.

[0064] Embodiments may include the following features.

[0065] (Configuration 1) A component to be placed around water, Transparent layer with uneven surface Equipped with the Ra value of the surface of the transparent layer is 1.0 or more and 4.0 or less; the Rsk value of the surface of the transparent layer is 0.0 or more and 1.4 or less; The transparent layer has a surface Rku value of 3.0 or more.

[0066] (Configuration 2) 2. The plumbing member according to claim 1, wherein the transparent layer contains at least one of acrylic resin, polyethylene terephthalate, polycarbonate, transparent vinyl chloride, and epoxy resin.

[0067] (Configuration 3) the transparent layer has a surface layer having the irregularities and a base layer located on a back surface side of the surface layer, the surface layer includes a coating film containing a resin and particles dispersed inside the coating film, 3. The water-related member according to claim 1, wherein the irregularities are formed by the particles.

[0068] (Configuration 4) 4. The plumbing member according to claim 3, wherein the surface layer has a pencil hardness of 1H or more.

[0069] (Configuration 5) 5. The water-related member according to claim 3 or 4, wherein the surface layer contains a hydrophilic compound containing at least one of an anionic functional group and a zwitterionic functional group.

[0070] As described above, according to the embodiment, a bathroom component that is both easy to clean and has a good design is provided.

[0071] The above describes the embodiments of the present invention. However, the present invention is not limited to these descriptions. Design modifications made by a person skilled in the art to the above-described embodiments are also included within the scope of the present invention as long as they incorporate the features of the present invention. For example, the shape, dimensions, materials, and arrangement of each element of the plumbing components are not limited to those illustrated and can be modified as appropriate. Furthermore, the elements of each of the above-described embodiments can be combined to the extent technically possible, and such combinations are also included within the scope of the present invention as long as they include the features of the present invention. [Explanation of symbols]

[0072] 10: Base material 10a: surface 20: Transparent layer 20a: Surface 21: Surface layer 21a: Surface 211: Coating 212: Particle 22: Base layer 30: Colored layer 100:Water-related materials 100a: Surface T1 to T3: Thickness

Claims

1. A component to be placed around water, A transparent layer having an uneven surface is provided, the Ra value of the surface of the transparent layer is 1.0 or more and 4.0 or less; the Rsk value of the surface of the transparent layer is 0.0 or more and 1.4 or less; The Rku value of the surface of the transparent layer is 3.0 or more.

2. The plumbing member according to claim 1, wherein the transparent layer contains at least one of an acrylic resin, polyethylene terephthalate, polycarbonate, transparent vinyl chloride, and epoxy resin.

3. the transparent layer has a surface layer having the irregularities and a base layer located on a back surface side of the surface layer, the surface layer includes a coating film containing a resin and particles dispersed inside the coating film, The plumbing member according to claim 1 or 2, wherein the irregularities are formed by the particles.

4. The plumbing member according to claim 3, wherein the surface layer has a pencil hardness of 1H or more.

5. The water-related member according to claim 3 , wherein the surface layer contains a hydrophilic compound containing at least one of an anionic functional group and a zwitterionic functional group.

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