Building material component and building material

Abstract

The present disclosure addresses the problem of providing a building material component in which design properties can be improved by a coating film and in which functionality can be improved. One embodiment for solving the aforementioned problem is a building material component in which a coating film is formed on at least part of a surface, wherein the coating film is such that the arithmetic average roughness Ra of the surface is 1.0-8.5 μm, and the maximum height roughness Rz of the surface is 6.0-45.0 μm.

Description

Building parts and materials

[0001] The present disclosure relates to components for building materials and building materials.

[0002] Conventionally, smoothness has been considered important for the coating film formed on the surface of building materials from the viewpoint of design. On the other hand, patterns have also been expressed by providing irregularities on the coating film surface. In addition, in order to enhance aesthetics and maintain a sense of luxury and dignity, it has also been practiced to make dirt such as fingerprints and water stains less noticeable.

[0003] Patent Document 1 discloses a printed matter that provides a visually and tactilely textured feel as a method for imparting a luxurious feel to a decorative material and that does not cause the problem of color contamination due to peeling of a colorant, etc. In the printed matter, the colored base coat layer and the transparent protective layer each contain fine particles, and at least some of the fine particles in the colored base coat layer protrude from the surface of the colored base coat layer.

[0004] Patent Document 2 discloses a technology for making stains such as fingerprints and water stains less noticeable by applying a gradation pattern to all or part of the surface of a building component. In the technology disclosed in Patent Document 2, the gradation pattern is expressed by varying the shades of one or more colors.

[0005] JP 2009-241539 A JP 2018-035589 A

[0006] In recent years, in addition to improving the design by forming irregularities on the coating film surface, there has been a demand for improved functionality of the coating film, such as making the building material on which the coating film is formed feel good and not sticky, or making it difficult for dirt to adhere to the surface of the building material or making it easy to remove dirt. The printed matter disclosed in Patent Document 1 had a problem in that the layer structure was complex, making the coating film formation process cumbersome. The technology disclosed in Patent Document 2 simply made dirt on the surface of the building material less noticeable, but did not improve functionality.

[0007] The present disclosure has been made in view of the above, and aims to provide a building component that can improve design and functionality by using a coating film.

[0008] The present disclosure relates to a building component having a coating film formed on at least a portion of its surface, wherein the coating film has an arithmetic mean roughness Ra of the surface of 1.0 to 8.5 μm and a maximum height roughness Rz of the surface of 6.0 to 45.0 μm.

[0009] 1A and 1B are diagrams illustrating an elevator (staircase) as a building material according to an embodiment of the present disclosure; 1C are diagrams illustrating a handrail as a building material component according to an embodiment of the present disclosure; 1D are diagrams illustrating a door as a building material according to an embodiment of the present disclosure; 1E are diagrams illustrating a shutter as a building material according to an embodiment of the present disclosure.

[0010] [Building Material Parts] The building material parts according to the present disclosure are parts that constitute building materials. The building material parts according to the present disclosure are parts that are placed in locations that are frequently touched by people's fingers, etc., and preferably have a coating film, as described below, formed on at least a portion of their surface. Examples of such building material parts include handrails when the building material is an elevator (stairs, ramps, etc.), and door handles when the building material is a door. In addition to the above, the building material parts may be frames, shoji screens, or crescents when the building material is a sash, or slats or guide rails when the building material is a shutter. Alternatively, the building material parts may be decorative frames such as interior storage frames, interior partitions, and interior decorative windows. It is preferable that the coating film according to the present disclosure is formed on at least locations that are frequently touched by people's fingers, etc., among the above building material parts. In other words, the coating film according to the present disclosure does not necessarily have to be formed on all of the surfaces of the above building material parts. Specific examples of building material parts will be described later.

[0011] [Building Material] The building material according to the present disclosure is a building material having a coating film, as described below, formed on at least a portion of its surface. The building material is not particularly limited, but the building material according to the present disclosure is preferably a building material that provides desirable functionality, i.e., desirable tactile feel or stain resistance, and is therefore frequently touched by people with their fingers, etc. A desirable tactile feel refers to, for example, a smooth feel or excellent warmth characteristics. A desirable stain resistance refers, for example, to a surface that is less susceptible to adhesion of dirt or is easy to remove. Examples of such building materials include elevators (stairs, ramps, etc.), doors, sashes, carports, etc. In addition to the above, the building material may also be a shutter, fence, etc., which may be subject to graffiti, etc. Among the above building materials, it is preferable that the coating film according to the present disclosure is formed at least on a portion that is frequently touched by people with their fingers, etc. (for example, the surface of the building material component shown below). That is, the coating film according to the present disclosure does not need to be formed on all of the surfaces of the above building materials. Specific examples of building materials will be described later.

[0012] [Coating Film] The coating film according to the present disclosure is formed on at least a portion of the surface of a building component. The coating film has an arithmetic mean roughness Ra of 1.0 to 8.5 μm and a maximum height roughness Rz of 6.0 to 45.0 μm. From the viewpoint of obtaining the preferred tactile feel, the arithmetic mean roughness Ra is preferably 1.1 to 2.2, and the maximum height roughness Rz is preferably 6.3 to 9.3. From the viewpoint of obtaining the preferred antifouling properties, the arithmetic mean roughness Ra is preferably 6.3 to 8.4, and the maximum height roughness Rz is preferably 34.9 to 44.1.

[0013] In this specification and claims, the arithmetic mean roughness Ra and maximum height roughness Rz of the surface of the coating film are measured by a measurement method in accordance with JIS B0601-2001. Here, it is preferable that the arithmetic mean roughness Ra and maximum height roughness Rz of the surface of the coating film measured in a predetermined direction (e.g., the longitudinal direction) and in a direction perpendicular to the predetermined direction (e.g., the lateral direction) are within the above-mentioned ranges, and it is more preferable that all of the arithmetic mean roughness Ra of the surface of the coating film measured in each direction are within the above-mentioned ranges.

[0014] From the viewpoint of obtaining the above-mentioned preferable tactile feel, the coating film preferably has a surface static friction coefficient of 0.81 or more and 0.92 or less, and a surface dynamic friction coefficient of 0.36 or more and 0.46 or less. The static friction coefficient is preferably 0.81 or more and 0.82 or less, and the dynamic friction coefficient is preferably 0.38 or more and 0.46 or less.

[0015] When the surface of the coating film satisfies the above-mentioned ranges of Ra, Rz, static friction coefficient, and dynamic friction coefficient, a smooth and desirable tactile feel can be imparted to the building material part, and a uniform and desirable design can be obtained overall.

[0016] A coating film with a surface temperature of 25°C is heated with a heating plate set at 36°C at 10 gf / cm ２ The maximum heat flux QMAX when in contact is 0.26 W / cm ２ It is preferable that the temperature is less than 100°C. This makes it difficult to feel hot or cold when touching the coating film, reducing the stress caused by feeling hot or cold, resulting in a pleasant tactile sensation. The heating plate has a higher temperature than the surface of the coating film, so it functions as a heat source.

[0017] The heating plate is a pure copper plate with a 0.5 mm thick chloroprene rubber attached to the surface that comes into contact with the coating surface. The temperature of the heating plate is set to 36°C, which is close to the temperature of human skin. The chloroprene rubber attached to the surface of the heating plate has a thermal conductivity close to that of human skin.

[0018] The coating has a water absorption of 50 mg / 21.2 cm ２ When the water absorption of the coating film satisfies the above range, the surface of the coating film dries easily, and a smooth and pleasant feel can be imparted to the building material part.

[0019] In this specification and claims, the water absorption amount means the total weight of water remaining on the surface of the coating film. The water absorption amount can be determined, for example, by contacting 10 g of water per circle with a predetermined area on the coating film surface (the total area of ​​three circles with a radius of 1.5 cm), recovering the water after 24 hours, and taking into account the weight of the recovered water, the difference in weight of the coating film before and after recovery, and the weight of water that evaporates.

[0020] From the viewpoint of obtaining the above-mentioned preferable antifouling properties, the coating film preferably has an oil droplet contact angle on the surface of 51° or more and 69° or less.

[0021] In this specification and claims, the oil droplet contact angle refers to the contact angle when diiodomethane is dropped onto the coating surface. The size of the droplet dropped onto the coating surface can be, for example, 2 μL. The value of the oil droplet contact angle can be, for example, the average value of measurements taken at five points.

[0022] The coating film preferably contains 1.0 mass % or more and 4.0 mass % or less of a fluorine-containing additive. Examples of the fluorine-containing additive include polyfluoroethylene-based additives and polyethylene / polyfluoroethylene-based additives. Polyethylene / polyfluoroethylene-based additives are additives in which polyethylene and polyfluoroethylene are pre-mixed. When the coating composition is heated to melt the resin components during coating film formation, the fluorine-containing additive rises to the coating film surface and forms irregularities. That is, a coating film is formed in which the fluorine-containing additive is preferentially present in the convex parts of the coating film surface. This makes it easier to adjust the arithmetic mean roughness Ra, maximum height roughness Rz, and oil droplet contact angle of the coating film surface to preferred ranges.

[0023] In addition to the fluorine-containing additive, the coating film may contain polyolefin wax particles, silicone compounds, resin beads, etc. as components for forming irregularities on the coating film surface.

[0024] Examples of polyolefin wax particles include polyethylene wax particles, polypropylene wax particles, and polytetrafluoroethylene (PTFE) modified polyethylene wax particles.

[0025] Examples of resins constituting the resin beads include thermoplastic resins or thermosetting resins such as nylon, polyolefin, acrylic resin, epoxy resin, polyester resin, urethane resin, and melamine resin. The particle size of the resin beads is preferably an average particle size D50 of 30 to 80 μm.

[0026] Commercially available resin beads can be used. For example, polyamide resin (nylon) beads include Orgasol (trade name, manufactured by Arkema Co., Ltd.) and Diamid (trade name, manufactured by Daicel-Evonik Co., Ltd.), and polyolefin resin beads include Mipelon XM (trade name, manufactured by Mitsui Chemicals, Inc.). Acrylic resin beads include thermoplastic resin beads such as Jurymer MB (trade name, manufactured by Toa Gosei Co., Ltd.), Tuftic AR (trade name, manufactured by Nippon Exlan Kogyo Co., Ltd.), Lovecolor (trade name, manufactured by Dainichiseika Color & Chemicals Mfg. Co., Ltd.), Techpolymer MBX, Techpolymer SBX, Techpolymer SME (trade name, manufactured by Sekisui Plastics Co., Ltd.), Finepearl PB, Finepearl PM (trade name, manufactured by Sumitomo Chemical Co., Ltd.), SPG type, and SP type (trade name, manufactured by Soken Chemical & Engineering Co., Ltd.). Examples of urethane resin beads include urethane beads (manufactured by Sekisui Chemical Co., Ltd.), and examples of melamine resin beads include thermosetting resin beads such as Eposter L (trade name, manufactured by Nippon Shokubai Co., Ltd.), Bellpearl R, Bellpearl H, and Bellpearl C (trade names, manufactured by Air Water Bellpearl Co., Ltd.).

[0027] The volume-based median diameter D50 of the fluorine-containing additive is not particularly limited, but is, for example, 6.0 μm or more and 9.0 μm or less. The volume-based median diameter D50 is the particle size at 50% of the integrated value of the volume-based particle size distribution measured by a laser diffraction / scattering method.

[0028] The coating film is formed from a coating composition. The type of coating composition is not particularly limited as long as it can form unevenness that satisfies the above-mentioned Ra and Rz conditions, but a powder coating composition is preferred. By forming the coating film using a powder coating composition, the coating film thickness can be made relatively thick, making it easier to satisfy the above-mentioned conditions. Below, an explanation will be given using a powder coating composition as an example.

[0029] <Powder Coating Composition> The powder coating composition according to this embodiment contains, for example, a resin, a color pigment, a curing agent, and a fluorine-containing additive. In addition to the above, the powder coating composition may contain other components such as a surface conditioner, a plasticizer, a curing accelerator, an ultraviolet absorber, a light stabilizer, an antioxidant, a flowability adjuster, a sagging inhibitor, an antifoaming agent, and the above-mentioned polyolefin wax particles, a silicone compound, and resin beads.

[0030] The resin is not particularly limited and may be any known resin used in powder coatings, such as polyester resin, epoxy resin, or fluororesin, and two or more of these may be used in combination.

[0031] The polyester resin preferably has a softening point of 100°C or higher and 150°C or lower. The polyester resin is, for example, a hydroxyl group-containing polyester. The hydroxyl group-containing polyester can be obtained, for example, by reacting a carboxylic acid component with a polyhydric alcohol component. Examples of the carboxylic acid component include polycarboxylic acids such as phthalic acid, isophthalic acid, terephthalic acid, naphthalenedicarboxylic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, 1,9-nonanedicarboxylic acid, 1,10-decanedicarboxylic acid, 1,12-dodecanedicarboxylic acid, 1,2-octadecanedicarboxylic acid, maleic acid, fumaric acid, cyclohexanedicarboxylic acid, hexahydrophthalic acid, tetrahydrophthalic acid, trimellitic acid, and pyromellitic acid; lower alkyl esters or anhydrides of polycarboxylic acids; and hydroxycarboxylic acids such as malic acid, tartaric acid, 1,2-hydroxystearic acid, and parahydroxybenzoic acid. Examples of polyhydric alcohol components include ethylene glycol, diethylene glycol, triethylene glycol, 1,2-propanediol, 1,3-propanediol, 1,3-butanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, 1,9-nonanediol, 1,10-decanediol, neopentyl glycol, spiroglycol, 1,10-decanediol, 1,4-cyclohexanedimethanol, trimethylolethane, trimethylolpropane, glycerin, and pentaerythritol.

[0032] The softening point of the epoxy resin is preferably 50°C or higher and 150°C or lower. Examples of epoxy resins include bisphenol A diglycidyl ether resins, bisphenol F diglycidyl ether resins, aminoglycidyl ether resins, bisphenol AD ​​diglycidyl ether resins, bisphenol Z diglycidyl ether resins, o-cresol novolac epoxy resins, phenol novolac epoxy resins, biphenol glycidyl ether resins, cyclopentadiene-skeleton epoxy resins, naphthalene-skeleton epoxy resins, and GMA acrylic resins. In place of epoxy resins other than those listed above, resins in which the substituents of the above epoxy resins have been converted to other substituents, such as modified resins modified by CTBN or esterification, may also be used.

[0033] The fluororesin is, for example, a reactive group-containing fluororesin having a reactive group that reacts with a curing agent. Examples of reactive groups include hydroxyl groups, carboxyl groups, amide groups, amino groups, nitrile groups, glycidyl groups, and isocyanate groups. Among these, hydroxyl groups are preferred from the viewpoint of stability of the reactive group-containing fluororesin and control of melt viscosity. The reactive group-containing fluororesin is obtained by (co)polymerizing a fluorine-containing monomer. Examples of fluorine-containing monomers include vinyl fluoride, vinylidene fluoride, trifluoroethylene, tetrafluoroethylene, bromotrifluoroethylene, chlorotrifluoroethylene, pentafluoropropylene, hexafluoropropylene, and (per)fluoroalkyl trifluorovinyl ether (wherein the (per)fluoroalkyl group has 1 to 18 carbon atoms). The reactive group-containing fluororesin may be obtained by copolymerizing a fluorine-containing monomer with a reactive group-containing monomer that is a monomer other than the fluorine-containing monomer. Examples of reactive group-containing monomers include vinyl ethers, olefins, allyl ethers, vinyl esters, allyl esters, (meth)acrylic esters, and crotonates.

[0034] Examples of color pigments include inorganic pigments such as titanium oxide, yellow iron oxide, titanium yellow, and red iron oxide, and organic pigments such as cyanine blue, cyanine green, permanent yellow FGL, permanent red F5RK, carbazole, quinacridone red, and carbon black, and two or more of these may be used in combination.

[0035] The polyolefin wax particles, silicone compounds, resin beads, etc. described above do not melt when the coating composition is heated to melt the resin components during coating film formation, and instead form irregularities on the coating film surface. Therefore, by including the above additives in the coating composition, it becomes easier to adjust the arithmetic mean roughness Ra, maximum height roughness Rz, static friction coefficient, and dynamic friction coefficient of the surface of the coating film to be formed within preferred ranges.

[0036] The curing agent is not particularly limited as long as it can react with the curable resin to form a crosslink. Examples of the curing agent include a blocked isocyanate curing agent, an amine curing agent, and an epoxy curing agent, and two or more of these may be used in combination.

[0037] Powder coatings are manufactured by known methods. The manufacturing method of powder coatings includes, for example, a premixing step, a melt-kneading step, a pulverizing step, and a classification step. The premixing step is a step of premixing the raw material composition of the powder coating using a mixer such as a Henschel mixer or a super mixer. The melt-kneading step is a step of melt-kneading the premix using various types of extruders. At this time, it is preferable to use a cooler such as a cooling roll or a cooling conveyor to cool and solidify the molten kneaded material into pellets. The pulverizing step is a step of pulverizing the molten kneaded material using a pulverizer such as a hammer mill or a jet mill. The classification step is a step of classifying the pulverized material using a classifier such as a vibration sieve, an ultrasonic sieve, or a cyclone classifier.

[0038] <Method of forming coating film> When applying a powder coating to a substrate (such as a building material or a component for a building material, or a component constituting these), for example, the powder coating is applied to at least a portion of the substrate, and then dried and heat-cured as necessary. Examples of methods for applying powder coating include electrostatic coating, electrostatic spraying, atomization, fluidized bed dipping, spraying, spraying, thermal spraying, and plasma thermal spraying. The temperature at which the powder coating is heat-cured is, for example, 110°C or higher and 230°C or lower. The thickness of the coating film can be 30 μm or higher. Note that before applying the powder coating, the substrate may be covered with a wrapping sheet, or an electrodeposition coating film or the like may be formed on the substrate.

[0039] The material constituting the substrate is not particularly limited, but examples thereof include metals such as aluminum, steel, and stainless steel, resins such as polycarbonate, acrylic resin, and vinyl chloride, and fiber reinforced plastics (FRP).

[0040] <Building Materials and Building Components> Examples of building materials and building components are described below with reference to the drawings. FIG. 1 is a diagram showing the configuration of a staircase 200, which is an elevator device serving as a building material. The staircase 200 has a handrail 100, which serves as a building component. The handrail 100 has a handrail bar 1 arranged along the slope of the staircase 200 and multiple support posts 2 attached along the longitudinal direction of the handrail bar 1. The multiple support posts 2 are erected on treads 201 of the staircase 200. As shown in FIG. 2 , the handrail bar 1 is formed from a rectangular metal material or the like. The handrail bar 1 has a bottom surface 1a, side surfaces 1b and 1d, and a top surface 1c. The handrail bar 1 is fixed to each support post 2 by brackets 3.

[0041] In the staircase 200, for example, it is preferable that the above coating film is formed at least on the surface of the handrail 100. Of the handrail 100, it is preferable that the above coating film is formed at least on the surface of the handrail bar 1. Of the handrail bar 1, it is preferable that the above coating film is formed at least on the top surface 1c and the side surfaces 1b and 1d. Since all of the above locations are likely to be touched by people, the effects of the present disclosure are preferably exerted. The locations on the staircase 200 where the coating film is formed are not limited to those described above; for example, the coating film may be formed on the support posts 2. FIG. 1 is an example of a staircase as an elevator device, and the elevator device may also be a slope without treads. In that case, as in the above example, it is preferable that the coating film is formed on at least a portion of the handrail or handrail bar.

[0042] 3 is a diagram showing the structure of a door 300 as a building material. The door 300 comprises a frame 4 fixed to a building, a door body 5 (door body) arranged within the frame 4 so as to be able to open and close, and a sleeve 8 arranged on the door tip side of the frame 4. The door 300 is an example of a door installed as an entrance to a building. The door 300 can be locked and unlocked by a locking device 9.

[0043] The frame 4 is provided along the four perimeters of the building opening. As shown in FIG. 3 , the frame 4 is framed in a rectangular shape by horizontal and vertical frames. A door body 5 and a sleeve 8 are arranged adjacent to each other in the width direction within the frame 4. The door body 5 is a swing door that can be opened and closed by rotating around the rotation axis of a hinge. As shown in FIG. 3 , an exterior door handle 6, which serves as a building component, is attached to the exterior surface of the door body 5. An interior door handle 7, which serves as a building component, is attached to the interior surface of the door body 5. A user who wants to open or close the door body 5 can grasp the exterior door handle 6 or the interior door handle 7 and push or pull the door body 5 to open or close it.

[0044] 3, the exterior door handle 6 has a grip bar 61 extending vertically and a pair of end support portions 62 protruding from the upper and lower ends of the grip bar 61 toward the door body 5. The interior door handle 7 similarly has a grip bar 71 and a pair of end support portions (not shown). The grip bars 61 and 71 are gripped when opening or closing the door body 5.

[0045] In the door 300, for example, it is preferable that the above-described coating film is formed on at least the surfaces of the exterior door handle 6 and the interior door handle 7. It is preferable that the above-described coating film is formed on at least the surfaces of the grip bars 61 and 71 of the exterior door handle 6 and the interior door handle 7. Because these areas are likely to be touched by people, the effects of the present disclosure are preferably achieved. The areas on the door 300 where the coating film is formed are not limited to those described above; for example, the coating film may be formed on the door body 5. Figure 3 shows an example of a door, an entrance door for a building. However, the door may be a door installed at the entrance to a warehouse, barn, etc., or a door installed at the entrance to an indoor room. The shape and type of the door handle are not limited to the door handle shown in Figure 3, and may be a lever handle or a ball handle depending on the type and purpose of the door.

[0046] Fig. 4 is a diagram showing the structure of a shutter 400 as a building material. The shutter 400 is installed in an opening provided in a building. As shown in Fig. 4, the shutter 400 is installed in an opening 12 provided in an exterior wall portion 11. The exterior wall portion 11 is not particularly limited, but may be, for example, the exterior wall portion of a garage where vehicles are stored.

[0047] The shutter 400 is, for example, a so-called internal shutter, and is provided on the indoor side of the exterior wall portion 11. The shutter 400 has a case 31, a winding shaft 32, a pair of left and right guide rails 33, and a shutter curtain 41. The case 31 is a member that houses the shutter curtain 41. The winding shaft 32 is a member around which the shutter curtain 41 is wound. Each guide rail 33 is a member that guides the shutter curtain 41 when the shutter curtain 41 is opened or closed.

[0048] The shutter curtain 41 is an opening / closing body that opens and closes the opening 12, with the vertical direction in FIG. 4 being the opening / closing direction. One of the opening / closing ends of the shutter curtain 41 is connected to the winding shaft 32. The shutter curtain 41 is sandwiched in the left-right direction by the guide rails 33. The shutter curtain 41 has a plurality of shutter slats 42 and a baseboard 46. Each shutter slat 42 is formed in an elongated shape with the left-right direction in FIG. 4 as the longitudinal direction. Each shutter slat 42 can be made of, for example, a metal such as iron, stainless steel, or aluminum, or a resin. The baseboard 46 is connected to the lower end of the lowest shutter slat 42 among the plurality of shutter slats 42. When the shutter curtain 41 is in a fully closed state, the baseboard 46 abuts or is close to the ground.

[0049] In the shutter 400, for example, it is preferable that the above-mentioned coating film is formed at least on the surface of each shutter slat 42. Because these areas are prone to graffiti and the like, the effect of the present disclosure, that is, the surface is less susceptible to adhesion of dirt or is easier to clean, is preferably exhibited. The areas on the shutter 400 where the coating film is formed are not limited to those described above; for example, the coating film may be formed on each guide rail 33, baseboard 46, etc. The above description and FIG. 4 are of a garage shutter, which is an example of a shutter. However, the type of shutter to which the present disclosure can be applied is not limited to garage shutters. The shutter may also be installed, for example, at the entrance or window of a store or warehouse.

[0050] Examples of the present disclosure will be described below, but the present disclosure is not limited to these examples.

[0051] (Preparation of Powder Coating) The raw materials (resin, pigment, curing agent, fluorine-containing additive, additive, surface conditioner) were blended in the blending amounts [parts by mass] shown in Tables 1 and 2 and then premixed. Next, the premix was melt-kneaded and then cooled. Next, the melt-kneaded product was pulverized and classified to obtain a powder coating.

[0052]

[0053]

[0054] Details of the raw materials in Tables 1 and 2 are shown below. Resin: hydroxyl group-containing polyester resin U-Pica Coat GV570 (manufactured by Japan U-Pica) Pigment: carbon black MA100 (manufactured by Mitsubishi Chemical) Curing agent: ε-caprolactam blocked isocyanate VESTAGON (registered trademark) B1530 (manufactured by Evonik Degussa) Additive: PTFE-modified polyethylene wax particles Ceraflower 969 (manufactured by BYK) having a volume-based median diameter D50 of 6 μm Fluorine-containing additive: PTFE-modified polyethylene wax particles Ceraflower 969 (manufactured by BYK) having a volume-based median diameter D50 of 6 μm Surface conditioner: Resiflow P67 (manufactured by ESTRONCHEMICAL), IRGAFOS 168 (manufactured by BASF), benzoin (manufactured by Fujifilm Wako Pure Chemical Industries)

[0055] (Preparation of Test Plates) An anodized aluminum plate having a thickness of 1.5 mm was hung vertically and electrostatically coated with the powder coating material according to each Example and Comparative Example at a voltage of -90 kV using a corona-charged electrostatic powder coater to a thickness of 80 μm. Next, the plate was thermally cured in an electric furnace at 180°C for 30 minutes, and then allowed to cool to room temperature to form a coating film, thereby obtaining a test plate.

[0056] [Arithmetic mean roughness Ra and maximum height roughness Rz of the surface of the surface layer] The arithmetic mean roughness Ra and maximum height roughness Rz of the surface of the coating film (10 cm x 15 cm) were measured using a surface roughness measuring instrument, Surfcorder SE500 (manufactured by Kosaka Laboratory). At this time, the arithmetic mean roughness Ra and maximum height roughness Rz were measured in the longitudinal direction (direction 1) and the lateral direction (direction 2) perpendicular to the longitudinal direction. The results are shown in Tables 3 and 4.

[0057] [Water Absorption Measurement] After the weight of the test plate for each Example and Comparative Example was measured in advance, three polypropylene cylinders (inner diameter 3 cm, height 3 cm) were placed on the coated surface (10 cm x 15 cm). 10 g of water was poured into each cylinder, and the weight of the test plate after pouring was measured. The cylinders were kept sealed at the top for 24 hours at a temperature of 23°C and a relative humidity of 50%. The weight of the test plate before collecting the water was then measured. The poured water was then collected, and the weight of the test plate after collection was measured. The water absorption was calculated based on the following formula (1), which takes into account the amount of evaporation. The results are shown in Table 3. Water absorption (mg / 21.2 cm ２ ) = ((weight of test plate after recovery) - (weight of test plate before insertion)) - ((weight of test plate after insertion) - (weight of test plate before recovery)) (1)

[0058] [Maximum heat flux QMAX of test plate] Using a Thermolab KES-F7 (manufactured by Kato Tech), the maximum heat flux QMAX of the test plate was measured as follows: The test plate was held in a thermostatic chamber so that the temperature of the test plate was kept stable at 25°C ± 0.5°C for at least 1 hour, and then a heating plate set to 36°C was heated to 10 gf / cm. ２ The QMAX was measured. The heating plate used was a pure copper plate with a 0.5 mm thick chloroprene rubber attached to the surface that came into contact with the surface layer. The results are shown in Table 3.

[0059] [Dynamic Friction Coefficient, Static Friction Coefficient] Using a multi-function static and dynamic friction measuring instrument TL-201Tt (manufactured by Trinity Lab Co., Ltd.), a tactile contactor simulating a fingerprint pattern was used to measure the static and dynamic friction coefficients of the test plates according to each example and comparative example. The measurement conditions were a load of 50 g, a speed of 10 mm / s, and a measurement distance of 40 mm. The results are shown in Table 3.

[0060] [Evaluation of tactile sensation (smoothness)] Ten subjects touched the surface of the test plate according to each of the Examples and Comparative Examples, and each subject evaluated the tactile sensation according to the following evaluation criteria. The average values ​​of the above evaluation results are shown in Table 3. A rating of 4 or higher in Table 3 was considered to be acceptable.

[0061] (Evaluation criteria) 5: Feels smooth 4: Feels somewhat smooth 3: Can't say whether it feels smooth or sticky 2: Feels somewhat sticky 1: Feels sticky

[0062] [Design Evaluation] The appearance of the test panels according to each of the Examples and Comparative Examples was visually evaluated according to the following evaluation criteria. The results are shown in Tables 3 and 4. Evaluation results in Tables 3 and 4: 2 was considered to be acceptable.

[0063] (Evaluation Criteria) 2: Good design (uniform texture observed overall) 1: Poor design (partial unevenness in texture observed) (The above "texture" refers to the appearance including color and gloss.)

[0064] [Oil Droplet Contact Angle Measurement] The oil drop contact angle of the test plates according to each Example and Comparative Example was measured using a contact angle measuring device DMs-401 (manufactured by Kyowa Interface Science Co., Ltd.). The liquid used for the measurement was diiodomethane, and the droplet dropped on the coating film surface was 2 μL. The measurement was performed five times, and the average value is shown in Table 4.

[0065] [Evaluation of Contamination Removal] A pseudo-sebum soil (artificial soil) substance was prepared in the following amounts: Myristic acid: 8.35 g, oleic acid: 8.35 g, triolein: 8.35 g, tristearin: 8.35 g, cholesterol: 4.4 g, cholesterol stearate: 1.1 g, paraffin wax (boiling point 130°F): 5.55 g, squalene: 5.55 g, Kanto loam: 50 g, carbon black: 0.5 g. 0.2 g of the prepared artificial soil was weighed and rubbed into the surface (40 mm square) of each test plate according to each Example and Comparative Example, and allowed to stand indoors for 24 hours. The area was then wiped with water, and the appearance of the test plate after wiping with water was visually evaluated according to the following evaluation criteria. A rating of 2 or higher in Table 4 was considered a pass.

[0066] (Evaluation criteria) 2: Dirt removed 1: Dirt not removed

[0067] [Evaluation of Fingerprint Adhesion] Several subjects left fingerprints on the surface of the test plates according to each of the Examples and Comparative Examples. Specifically, fingerprints were left on the surface of a 40 mm x 40 mm test plate by touching each of eight places with their thumbs once each. The appearance of the test plate after fingerprints was visually inspected and evaluated according to the following evaluation criteria. A rating of 4 or higher in Table 4 was deemed to be acceptable.

[0068] (Evaluation criteria) 5: No fingerprints at all 4: Fingerprints are attached to 25% or less of the total area 3: Fingerprints are attached to more than 25% but not more than 50% of the total area 2: Fingerprints are attached to more than 50% but not more than 75% of the total area 1: Fingerprints are attached to more than 75% but not more than 100% of the total area

[0069]

[0070]

[0071] From the results shown in Table 3, it is clear that the test plates according to each Example have preferable design and tactile sensation compared to the test plates according to the Comparative Examples. From the results shown in Table 4, it is clear that the test plates according to each Example are less susceptible to adhesion of dirt to the surface and easier to remove dirt from the surface compared to the test plates according to the Comparative Examples. It is also clear that preferable design is obtained.

[0072] 200 Stairs (building materials), 300 Doors (building materials), 400 Shutters (building materials), 100 Handrails (building material parts), 6 Outdoor door handles (building material parts), 7 Indoor door handles (building material parts), 42 Shutter slats (building material parts)

Claims

1. A building component having a coating film formed on at least a portion of its surface, wherein the coating film has an arithmetic mean roughness Ra of 1.0 to 8.5 μm and a maximum height roughness Rz of 6.0 to 45.0 μm.

2. The building component according to claim 1, wherein the coating film has a surface static friction coefficient of 0.81 or more and 0.92 or less, and a surface dynamic friction coefficient of 0.36 or more and 0.46 or less.

3. A heating plate set at 36°C is applied to the coating film of the building material part whose surface temperature is set at 25°C at 10 gf / cm ２ The maximum heat flux QMAX when in contact with ２ The building component according to claim 1 or 2, wherein the heating plate is a pure copper plate having a 0.5 mm thick chloroprene rubber attached to a surface thereof that comes into contact with the coating film.

4. The water absorption of the coating film is 50 mg / 21.2 cm ２ The part for building materials according to any one of claims 1 to 3.

5. A building component according to claim 1, wherein the coating film has an oil droplet contact angle on the surface of 51° or more and 69° or less.

6. The building component according to claim 5, wherein the coating film contains 1.0% by mass or more and 4.0% by mass or less of a fluorine-containing additive.

7. The building component according to any one of claims 1 to 6, which is a handrail, a door handle, or a shutter slat.

8. A building material comprising the building material component according to any one of claims 1 to 7.

9. The building material according to claim 8, which is a lifting device, a door, or a shutter.

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