Building material components and building materials

Abstract

To provide building materials that are resistant to dirt adhering to their surface, or that allow for easy removal of surface dirt. [Solution] A building material component having a coating film formed on at least a part of the surface of a substrate, wherein the coating film has an arithmetic mean surface roughness Ra of 1.0 to 8.5 μm, a maximum surface height roughness Rz of 6.0 to 45.0 μm, and an oil droplet contact angle of 51° to 69°.

Description

Technical Field

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

Background Art

[0002] Conventionally, the smoothness of the coating film formed on the surface of building materials has been emphasized from the viewpoint of design. On the other hand, in order to enhance the aesthetic appearance and maintain a sense of luxury and solidity, stains such as fingerprint marks and water scale are made less noticeable.

[0003] Patent Document 1 discloses a technique for making stains such as fingerprint marks and water scale less noticeable by applying a gradation pattern to all or part of the surface of a building member. In the technique disclosed in Patent Document 1, the gradation pattern is expressed by one color or shades of two or more colors.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The technique disclosed in Patent Document 1 merely makes the stains on the surface of a building member less noticeable. On the other hand, a technique that makes it difficult for stains to adhere to the surface of building materials or that makes it easy to remove stains has been desired.

[0006] The present disclosure has been made in view of the above, and an object thereof is to provide a building material part to which stains hardly adhere to the surface or from which surface stains can be easily removed.

Means for Solving the Problems

[0007] This disclosure relates to a building material component having a coating film formed on at least a portion of its surface, wherein the coating film has an arithmetic mean surface roughness Ra of 1.0 to 8.5 μm, a maximum surface height roughness Rz of 6.0 to 45.0 μm, and an oil droplet contact angle of the coating film of 51° to 69°. [Brief explanation of the drawing]

[0008] [Figure 1] This figure shows a staircase, which is a building material according to one embodiment of the present disclosure. [Figure 2] This figure shows a handrail, which is a building material component according to one embodiment of the present disclosure. [Figure 3] This figure shows a door, which is a building material according to one embodiment of the present disclosure. [Figure 4] This figure shows a shutter, which is a building material according to one embodiment of the present disclosure. [Modes for carrying out the invention]

[0009] [Building materials parts] The building material components relating to this disclosure are components that constitute building materials. The building material components relating to this disclosure are components that are frequently touched by people with their fingers, etc., and it is preferable that at least a part of their surface is coated with the coating described below. Examples of such building material components include, for example, handrails when the building material is a lifting device (stairs, ramps, etc.), and door handles when the building material is a door. In addition to the above, building material components may also be frames, shoji screens, and crescent locks when the building material is a sash, or slats and guide rails when the building material is a shutter. Alternatively, they may be decorative frames such as interior storage frames, interior partitions, and interior decorative windows. Of the above building material components, it is preferable that the coating according to this disclosure is formed on at least the parts that are frequently touched by people with their fingers, etc. That is, it is not necessary for the entire surface of the above building material components to be coated with the coating according to this disclosure. Specific examples of building material components will be described later.

[0010] [Building materials] The building material relating to this disclosure is a building material on which a coating film described below is formed on at least a portion of its surface. The building material is not particularly limited, but it is preferable that the building material relating to this disclosure is a building material that is frequently touched by people with their hands, etc., because dirt does not easily adhere to the surface or dirt is easy to remove from the surface. Examples of such building materials include, for example, 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. It is preferable that the coating film relating to this disclosure is formed on at least the parts of the above building material that are frequently touched by people with their hands, etc. (for example, the surface of the building material components shown below). That is, it is not necessary for the coating film relating to this disclosure to be formed on the entire surface of the above building material. Specific examples of building materials will be described later.

[0011] [coating film] The coating film according to this disclosure is formed on at least a portion of the surface of a building material component. The coating film has an arithmetic mean surface roughness Ra of 1.0 to 8.5 μm and a maximum surface height roughness Rz of 6.0 to 45.0 μm. Preferably, the arithmetic mean surface roughness Ra is between 6.3 and 8.4, and preferably, the maximum surface height roughness Rz is between 34.9 and 44.1.

[0012] In this specification and the 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 a direction perpendicular to the predetermined direction (e.g., the transverse direction) are within the above range, and it is even 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 range.

[0013] The coating film has an oil droplet contact angle on its surface of 51° to 69°.

[0014] In this specification and in the claims, the oil droplet contact angle refers to the contact angle when diiodomethane is dropped onto the surface of a coating film. The size of the droplet dropped onto the coating film surface can be, for example, 2 μL. The numerical value of the oil droplet contact angle can be, for example, the average of five measured values.

[0015] The coating film preferably contains 1.0% to 4.0% by mass of a fluorine-containing additive. Examples of fluorine-containing additives 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 paint composition is heated during coating film formation to melt the resin components, the fluorine-containing additive rises to the surface of the coating film, forming irregularities. That is, a coating film is formed in which the fluorine-containing additive preferentially exists in the convex parts of the coating film surface. This makes it easier to adjust the arithmetic mean roughness Ra, the maximum height roughness Rz, and the oil droplet contact angle of the coating film surface to a desirable range.

[0016] In addition to fluorine-containing additives, the coating film may also contain polyolefin wax particles, silicone compounds, resin beads, and other components for forming irregularities on the coating film surface.

[0017] Examples of polyolefin wax particles include polyethylene wax particles and polypropylene wax particles.

[0018] Examples of resins that make up 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 average particle size D50 of the resin beads is preferably 30 to 80 μm.

[0019] As the resin beads, commercially available products can be used. For example, as polyamide resin (nylon) beads, there are Orgasol (trade name, manufactured by Arkema Co., Ltd.), Diamide (trade name, manufactured by Daicel - Evonik Co., Ltd.), etc.; as polyolefin resin beads, there is Mipelon XM (trade name: manufactured by Mitsui Chemicals, Inc.), etc. As acrylic resin beads, there are Julimer MB (trade name, manufactured by Toagosei Co., Ltd.), Toughic AR (trade name, manufactured by Nippon Exelan Industries Co., Ltd.), Love Color (trade name, manufactured by Dainichi Seika Kogyo Co., Ltd.), Tech Polymer MBX, Tech Polymer SBX, Tech Polymer SME (trade name, manufactured by Sekisui Chemical Products Co., Ltd.), Fine Pearl PB, Fine Pearl PM (trade name, manufactured by Sumitomo Chemical Co., Ltd.), SPG type, SP type (trade name, manufactured by Soken Chemical & Engineering Co., Ltd.), etc., which are thermoplastic resin beads. As urethane resin beads, there is Urethane Beads (manufactured by Sekisui Chemical Products Co., Ltd.), etc.; as melamine resin beads, there are Epotar L (trade name, manufactured by Nippon Catalyst Co., Ltd.), Bel Pearl R, Bel Pearl H, Bel Pearl C (trade name, manufactured by Air Water Bel Pearl Co., Ltd.), etc., which are thermosetting resin beads.

[0020] The volume - based median diameter D50 of the fluorine - containing additive is not particularly limited, but for example, it is 6.0 μm or more and 9.0 μm or less. The volume - based median diameter D50 is the particle diameter at 50% of the integrated value of the volume - based particle size distribution measured by the laser diffraction / scattering method.

[0021] The coating film is formed by the coating composition. The type of the coating composition is not particularly limited as long as it can form irregularities satisfying the above - mentioned Ra, Rz, and oil - droplet contact angle conditions, but a powder coating composition is preferred. By forming the above - mentioned coating film with a powder coating composition, the coating film thickness can be made relatively thick, so it is easier to satisfy the above - mentioned conditions. Hereinafter, the powder coating composition will be described as an example.

[0022] <Powder Coating Composition> The powder coating composition according to this embodiment includes, for example, a resin, a coloring pigment, a curing agent, and a fluorine-containing additive. In addition to the above, the powder coating composition may also contain surface modifiers, plasticizers, curing accelerators, ultraviolet absorbers, light stabilizers, antioxidants, flow modifiers, anti-sagging agents, defoaming agents, and other components such as the polyolefin wax particles, silicone compounds, and resin beads mentioned above.

[0023] The resin used is not particularly limited and can be any known resin used in powder coatings. Examples of resins include polyester resins, epoxy resins, and fluororesins, and two or more may be used in combination.

[0024] The polyester resin preferably has a softening point of 100°C to 150°C. 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 carboxylic acid components include polyhydric acids such as phthalic acid, isophthalic acid, terephthalic acid, naphthalenedicarboxylic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebatic 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, pyromellitic acid, lower alkyl esters or anhydrides of polyhydric acids, 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.

[0025] The epoxy resin preferably has a softening point of 50°C to 150°C. Examples of epoxy resins include bisphenol A type diglycidyl ether resin, bisphenol F type diglycidyl ether resin, aminoglycidyl ether resin, bisphenol AD ​​type diglycidyl ether resin, bisphenol Z type diglycidyl ether resin, o-cresol novolac epoxy resin, phenol novolac epoxy resin, biphenol glycidyl ether resin, cyclopentadiene skeleton epoxy resin, naphthalene skeleton epoxy resin, and GMA acrylic resin. In place of epoxy resins other than those listed above, resins in which substituents of the above epoxy resins have been converted to other substituents, such as CTBN or modified resins that have undergone esterification, may be used.

[0026] Fluororesins are, for example, reactive group-containing fluororesins that have reactive groups that react 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 controlling the stability and melt viscosity of the reactive group-containing fluororesin. Reactive group-containing fluororesins are obtained by (co)polymerizing fluorine-containing monomers. Examples of fluorine-containing monomers include vinyl fluoride, vinylidene fluoride, trifluoroethylene, tetrafluoroethylene, bromotrifluoroethylene, chlorotrifluoroethylene, pentafluoropropylene, hexafluoropropylene, and (per)fluoroalkyltrifluorovinyl ether (where the number of carbon atoms in the (per)fluoroalkyl group is 1 to 18). Reactive group-containing fluororesins may also be obtained by copolymerizing a fluorine-containing monomer with a reactive group-containing monomer other than a fluorine-containing monomer. Examples of monomers containing reactive groups include vinyl ethers, olefins, allyl ethers, vinyl esters, allyl esters, (meth)acrylic acid esters, and crotonic acid esters.

[0027] Examples of coloring pigments include inorganic pigments such as titanium dioxide, 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. Two or more types may be used in combination.

[0028] The curing agent is not particularly limited as long as it can react with the curable resin and crosslink, but examples include blocked isocyanate curing agents, amine curing agents, and epoxy curing agents, and two or more may be used in combination.

[0029] Powder coatings are manufactured by known methods. A method for manufacturing powder coatings includes, for example, a premixing step, a melt-kneading step, a grinding 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 cool and solidify the melt-kneaded material using a cooler such as a cooling roll or a cooling conveyor to form pellets. The grinding step is a step of grinding the melt-kneaded material using a grinder such as a hammer mill or a jet mill. The classification step is a step of classifying the ground material using a classifier such as a vibrating sieve, an ultrasonic sieve, or a cyclone classifier.

[0030] <Method for forming a coating film> When applying powder coating to an object to be coated (building materials or building material parts, or components that make them up, etc.), for example, after applying the powder coating to at least a part of the object to be coated, it is dried and heat-cured as necessary. Examples of powder coating methods include electrostatic coating, electrostatic spraying, spraying, fluid immersion, spraying, thermal spraying, and plasma spraying. The temperature for heat-curing the powder coating is, for example, 110°C to 230°C. The thickness of the coating film can be 30 μm or more. Before applying the powder coating, the object to be coated may be covered with a wrapping sheet, or an electrodeposited coating film may be formed on the object to be coated.

[0031] The materials constituting the object to be coated are not particularly limited, but examples include metals such as aluminum, steel, and stainless steel; resins such as polycarbonate, acrylic resin, and polyvinyl chloride; and fiber-reinforced plastics (FRP).

[0032] <Building materials and building material components> An example of building materials and building material components will be described below with reference to the drawings. Figure 1 shows the configuration of a staircase 200, which is a lifting device as a building material. The staircase 200 has a handrail 100 as a building material component. The handrail 100 has a handrail rod 1 arranged to follow the slope of the staircase 200, and a plurality of support posts 2 attached along the longitudinal direction of the handrail rod 1. The plurality of support posts 2 are erected on the treads 201 of the staircase 200. The handrail rod 1 is formed from a square metal material or the like, as shown in Figure 2. The handrail rod 1 has a bottom surface 1a, sides 1b and 1d, and a top surface 1c. The handrail rod 1 is fixed to each support post 2 by brackets 3.

[0033] In the staircase 200, it is preferable that the above-mentioned coating is formed on at least the surface of the handrail 100. Of the handrail 100, it is preferable that the above-mentioned coating is formed on at least the surface of the handrail rod 1. Of the handrail rod 1, it is preferable that the above-mentioned coating is formed on at least the upper surface 1c and the sides 1b and 1d. Since all of the above-mentioned areas are areas that are highly likely to be touched by people, the effects of this disclosure are preferably exhibited. The areas on the staircase 200 where the coating is formed are not limited to the above, and for example, the coating may be formed on the support column 2. Figure 1 is an example of a staircase as a lifting device, and the lifting device may be a ramp without treads. In that case, similar to the above example, it is preferable that the coating is formed on at least a part of the handrail or handrail rod.

[0034] Figure 3 shows the configuration of a door 300 as a building material. The door 300 comprises a frame 4 fixed to the building, a door body 5 (door body) that is openable and closable and arranged within the frame 4, and a side section 8 arranged on the leading edge side of the frame 4. The door 300 is an example of a door installed for the entrance of a building. The door 300 can be locked and unlocked by a locking device 9.

[0035] The frame 4 is provided along the four sides of the opening of the building. As shown in Figure 3, the frame 4 is framed in a rectangular shape by horizontal and vertical frames. Inside the frame 4, the door body 5 and the side panels 8 are arranged adjacent to each other in the width direction. The door body 5 is a hinged door that can be opened and closed by rotating around the pivot axis of the hinge. As shown in Figure 3, an exterior door handle 6, which is a building material component, is attached to the exterior surface of the door body 5. An interior door handle 7, which is a building material component, is attached to the interior surface of the door body 5. Users opening and closing 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 and close it.

[0036] As shown in Figure 3, the exterior door handle 6 has a grip bar 61 that extends vertically and a pair of end support parts 62 that protrude toward the door body 5 from the upper and lower ends of the grip bar 61. Similarly, the interior door handle 7 has a grip bar 71 and a pair of end support parts (not shown). The grip bars 61 and 71 are gripped when opening and closing the door body 5.

[0037] In door 300, it is preferable that the above-mentioned coating is formed on the surface of at least the exterior door handle 6 and the interior door handle 7. Of the exterior door handle 6 and the interior door handle 7, it is preferable that the above-mentioned coating is formed on the surface of at least the grab bar 61 and the grab bar 71. Since all of the above-mentioned areas are areas that are highly likely to be touched by people, the effects of this disclosure are preferably demonstrated. The areas on door 300 where the coating is formed are not limited to the above, and for example, the coating may be formed on the door body 5. Figure 3 is an example of a door, which is a door for the entrance of a building. The door may be a door installed at the entrance of a warehouse or barn, or a door installed at the entrance of a room inside a building. The shape and type of door handle are not limited to the door handle shown in Figure 3, and may be a lever handle or a knob-type handle depending on the type and use of the door.

[0038] Figure 4 shows the configuration of the shutter 400 as a building material. The shutter 400 is installed in an opening in a building. As shown in Figure 4, the shutter 400 is installed in an opening 12 in the exterior wall 11. The exterior wall 11 is not particularly limited, but for example, it is the exterior wall of a garage for storing vehicles.

[0039] The shutter 400 is, for example, a so-called internal shutter, and is installed on the interior side of the exterior wall 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 the member that houses the shutter curtain 41. The winding shaft 32 is the member from which the shutter curtain 41 is wound. Each guide rail 33 is a member that guides the shutter curtain 41 when it is opened and closed.

[0040] The shutter curtain 41 is an opening and closing mechanism that opens and closes the opening 12, with the vertical direction in Figure 4 being the opening and closing direction. One end of each end of the shutter curtain 41 in the opening and closing direction is connected to the winding shaft 32. The shutter curtain 41 is sandwiched in the left-right direction by each guide rail 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 Figure 4 as its longitudinal direction. Each shutter slat 42 can be made of a metal such as iron, stainless steel, or aluminum, or a resin. The baseboard 46 is connected to the lower end of the shutter slat 42 that is located at the bottom of the plurality of shutter slats 42. When the shutter curtain 41 is completely closed, the baseboard 46 is in contact with or close to the ground.

[0041] In the shutter 400, it is preferable that the above-mentioned coating is formed on the surface of at least each shutter slat 42. Since these areas are prone to graffiti and the like, the effects of this disclosure, such as making it difficult for dirt to adhere to the surface or making it easy to remove dirt from the surface, are preferably exhibited. The areas on which the coating is formed in the shutter 400 are not limited to those described above; for example, the coating may be formed on each guide rail 33, the baseboard 46, etc. The above description and Figure 4 are of a garage shutter, which is an example of a shutter. However, the types of shutters to which this disclosure can be applied are not limited to garage shutters. Shutters may be installed, for example, at the entrances or windows of shops or warehouses. [Examples]

[0042] The following describes embodiments of this disclosure, but this disclosure is not limited to these embodiments.

[0043] (Preparation of powder coatings) The raw materials (resin, pigment, curing agent, fluorine-containing additive, and surface modifier) ​​were blended in the proportions [parts by mass] shown in Table 1, and then pre-mixed. Next, the pre-mixed mixture was melt-kneaded and then cooled. Finally, the melt-kneaded mixture was pulverized and classified to obtain powder coating.

[0044] [Table 1]

[0045] The details of the raw materials in Table 1 are shown below. Resin: Hydroxyl group-containing polyester resin, Yupika Coat GV570 (manufactured by Yupika Japan) Pigment: Carbon Black MA100 (manufactured by Mitsubishi Chemical) Hardener: ε-Caprolactam Block Isocyanate VESTAGON® B1530 (manufactured by Evonik Degussa) Fluorine-containing additive: PTFE-modified polyethylene wax particles with a volume-based median diameter D50 of 6 μm, Ceraflower 969 (manufactured by BYK). Surface modifiers: Resiflo P67 (ESTRONCHEMICAL), IRGAFOS 168 (BASF), Benzoin (Fujifilm Wako Pure Chemical Industries)

[0046] (Preparation of test panels) An anodized aluminum plate with a thickness of 1.5 mm was suspended vertically, and the powder coatings according to each example and comparative example were electrostatically coated using a corona-charging electrostatic powder coating machine at a voltage of -90 kV to a thickness of 80 μm. Next, the coatings were heat-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 test plates.

[0047] [Arithmetic mean surface roughness Ra, maximum height roughness Rz] The arithmetic mean roughness Ra and maximum height roughness Rz of a coating film surface (10 cm x 15 cm) were measured using a surface roughness measuring instrument, SurfCorder SE500 (manufactured by Kosaka Laboratory). The arithmetic mean roughness Ra and maximum height roughness Rz were measured in both the longitudinal direction (direction 1) and the transverse longitudinal direction (direction 2). The results are shown in Table 2.

[0048] [Oil droplet contact angle measurement] The oil droplet contact angles of the test plates for each example and comparative example were measured using a contact angle measuring device DMs-401 (manufactured by Kyowa Interface Science Co., Ltd.). The liquid used for measurement was diiodomethane, and the amount of droplet dropped onto the coating surface was 2 μL. Measurements were performed five times, and the average values ​​are shown in Table 2.

[0049] [Decontamination capability assessment] A simulated sebum stain (artificial grime) substance was prepared with the following proportions: Myristic acid: 8.35g, Oleic acid: 8.35g, Triolein: 8.35g, Tristearin: 8.35g, Cholesterol: 4.4g, Cholesterol stearate: 1.1g, Paraffin wax (boiling point 130°F): 5.55g, Squalene: 5.55g, Kanto loam: 50g, Carbon black: 0.5g. 0.2g of the above-prepared artificial grime was weighed and rubbed onto the surface (40mm square) of the test plate for each example and comparative example, and left indoors for 24 hours. After that, the above area was wiped with water, and the appearance of the test plate after wiping was visually evaluated according to the following evaluation criteria. An evaluation result of 2 or higher in Table 2 was considered a pass.

[0050] (Evaluation Criteria) 2: Dirt has been removed. 1: The dirt has not been removed.

[0051] [Fingerprint adhesion evaluation] Multiple subjects left fingerprints on the surface of the test plates for each example and comparative example. Specifically, they touched eight locations on the surface of a 40mm x 40mm test plate once each with their thumb to leave fingerprints. The appearance of the test plates after fingerprint application was visually inspected and evaluated according to the following evaluation criteria. A score of 4 or higher in Table 2 was considered a pass.

[0052] (Evaluation Criteria) 5: No fingerprints are present at all. 4. Fingerprints cover less than 25% of the total surface area. 3: Fingerprints cover more than 25% but less than 50% of the total surface area. 2: Fingerprints cover more than 50% but less than 75% of the total surface area. 1: Fingerprints cover more than 75% but less than 100% of the total surface area.

[0053] [Design evaluation] The appearance of the test plates for each example and comparative example was evaluated visually according to the following evaluation criteria. The results are shown in Table 2. Evaluation result in Table 2: A score of 2 was considered acceptable.

[0054] (Evaluation Criteria) 2: Good design quality (a uniform texture is observed throughout) 1: Poor design quality (partial unevenness in texture observed) (The term "texture" above refers to the overall appearance, including color and gloss.)

[0055] [Table 2]

[0056] The results shown in Table 2 clearly demonstrate that the test plates according to each embodiment are less prone to surface contamination and easier to clean compared to the test plates according to the comparative examples. Furthermore, it is clear that a desirable design can be obtained. [Explanation of Symbols]

[0057] 200 Stairs (building materials), 300 Doors (building materials), 400 Shutters (building materials), 100 Handrails (building material parts), 6 Exterior door handles (building material parts), 7 Interior door handles (building material parts), 42 Shutter slats (building material parts)

Claims

1. A building material component having a coating film formed on at least a portion of the surface of the base material, The coating film has an arithmetic mean surface roughness Ra of 1.0 to 8.5 μm, and a maximum surface height roughness Rz of 6.0 to 45.0 μm. The aforementioned coating film is a building material component in which the oil droplet contact angle on the surface is 51° or more and 69° or less.

2. The building material component according to claim 1, wherein the coating film contains 1.0% by mass or more and 4.0% by mass or less of a fluorine-containing additive.

3. A building material component according to claim 1 or 2, which is a handrail, a door handle, or a shutter slat.

4. A building material comprising the building material component described in claim 1 or 2.

5. The building material according to claim 4, which is a lifting device, a door, or a shutter.

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