Building material components and building materials

Abstract

To provide building material components that have a desirable tactile feel. [Solution] A building material component having a coating film formed on at least a part of its surface, wherein the coating film has an arithmetic mean surface roughness Ra of 1.0 or more and 8.5 μm or less, a maximum surface height roughness Rz of 6.0 or more and 45.0 μm or less, a static friction coefficient of 0.81 or more and 0.92 or less, and a dynamic friction coefficient of 0.36 or more and 0.46 or less.

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, patterns are also expressed by providing irregularities on the surface of the coating film.

[0003] Patent Document 1 discloses a printed matter that gives a sense of luxury to decorative materials, gives a sense of unevenness visually and tactilely, and does not cause problems of coloring contamination due to peeling of a coloring agent or the like. 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.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] By the way, in recent years, there has been a demand for a paint that can improve the tactile feeling of building materials on which a coating film is formed. By forming irregularities on the surface of the coating film, a preferable tactile feeling without stickiness can be obtained, but a further preferable tactile feeling has been demanded. The printed matter disclosed in Patent Document 1 has a problem that the layer structure becomes complicated and the coating film formation process becomes complicated.

[0006] The present disclosure has been made in view of the above, and an object thereof is to provide a building materials part provided with a preferable tactile feeling.

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 or more and 8.5 μm or less, a maximum surface height roughness Rz of 6.0 or more and 45.0 μm or less, a static friction coefficient of the surface of 0.81 or more and 0.92 or less, and a dynamic friction coefficient of the surface of 0.36 or more and 0.46 or less. [Brief explanation of the drawing]

[0008] [Figure 1] This figure shows a lifting device (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. [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, the building material components may also be frames, shoji screens, and crescent locks when the building material is a sash. Alternatively, they may be interior storage frames, interior partitions, decorative frames for interior windows, etc. It is preferable that the coating according to this disclosure is formed on at least the parts of the above building material components 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 part of its surface. The building material is not particularly limited, but the building material relating to this disclosure is preferably a building material that is frequently touched by people's fingers, etc., because it has a desirable tactile feel, such as a smooth feel. Examples of such building materials include lifting devices (stairs, ramps, etc.), doors, sashes, carports, 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's fingers, etc. (for example, the surface of the building material components shown below). That is, the coating film relating to this disclosure does not have 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 1.1 and 2.2, and preferably, the maximum surface height roughness Rz is between 6.3 and 9.3.

[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 a surface static friction coefficient of 0.81 to 0.92 and a surface dynamic friction coefficient of 0.36 to 0.46. Preferably, the static friction coefficient is 0.81 to 0.82, and preferably the dynamic friction coefficient is 0.38 to 0.46.

[0014] By making the surface of the coating film satisfy the above ranges of Ra, Rz, static friction coefficient, and dynamic friction coefficient, a smooth and preferable tactile sensation can be imparted to the building material parts, and a uniform and preferable design property can be obtained as a whole.

[0015] When a heating plate set at 36°C is brought into contact with a coating film whose surface temperature is set at 25°C at 10 gf / cm 2 the maximum heat flux QMAX is preferably 0.26 W / cm 2 or less. Thereby, even when the coating film is touched by hand, it is difficult to feel heat or cold, so the stress caused by feeling heat or cold is reduced, and as a result, a preferable tactile sensation is obtained. Since the temperature of the heating plate is higher than the surface of the coating film, it functions as a heat source.

[0016] The heating plate is a pure copper plate to which chloroprene rubber with a thickness of 0.5 mm is attached to the surface on the side contacting the surface of the coating film. The temperature of the heating plate is set at 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.

[0017] The water absorption of the coating film is preferably 50 mg / 21.2 cm 2 or more. By making the water absorption of the coating film satisfy the above range, the surface of the coating film becomes easy to dry, so that a smooth and preferable tactile sensation can be imparted to the building material parts.

[0018] In this specification and the claims, the above water absorption means the total weight of water remaining on the surface of the coating film. The above water absorption can be obtained, for example, by bringing 10 g of water per circle into contact with a predetermined area (the total area of three circles with a radius of 1.5 cm) on the surface of the coating film, recovering the water after 24 hours, and taking into account the weight of the recovered water, the weight difference of the coating film before and after recovery, and the volatile weight of the water.

[0019] The coating film is formed by a coating composition. The type of the coating composition is not particularly limited as long as it can form irregularities that satisfy the above Ra, Rz, static friction coefficient, and dynamic friction coefficient conditions, but a powder coating composition is preferred. By forming the above coating film with a powder coating composition, the coating film thickness can be made relatively thick, making it easier to satisfy the above conditions. Hereinafter, the powder coating composition will be described as an example.

[0020] <Powder coating composition> The powder coating composition according to the present embodiment includes, for example, a resin, a coloring pigment, a curing agent, and an 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 fluidity modifier, a sag prevention agent, and an antifoaming agent.

[0021] As the resin, known resins used in powder coatings can be used and are not particularly limited. Examples of the resin include polyester resins, epoxy resins, and fluororesins, and two or more kinds may be used in combination.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] Examples of additives include polyolefin wax particles, silicone compounds, and resin beads. When the paint composition is heated during film formation to melt the resin components, these additives do not melt, and instead create irregularities on the surface of the paint film. Therefore, the inclusion of these additives in the paint composition makes it easier to adjust the arithmetic mean roughness Ra, the maximum height roughness Rz, the static friction coefficient, and the dynamic friction coefficient of the formed paint film surface to a desirable range.

[0027] The polyolefin wax particles are not particularly limited, but examples include polyethylene wax particles, polypropylene wax particles, and polytetrafluoroethylene (PTFE) modified polyethylene wax particles.

[0028] 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.

[0029] Commercially available resin beads can be used. For example, polyamide resin (nylon) beads include Orgasol (trade name, manufactured by Arkema, Inc.) and Diamide (trade name, manufactured by Daicel-Evonik), while polyolefin resin beads include Mipelon XM (trade name, manufactured by Mitsui Chemicals, Inc.). Examples of acrylic resin beads include Jurimar MB (trade name, manufactured by Toagosei Co., Ltd.), Toughtick AR (trade name, manufactured by Nippon Exlan Kogyo Co., Ltd.), Labcolor (trade name, manufactured by Dainichi Seika Kogyo Co., Ltd.), Techpolymer MBX, Techpolymer SBX, Techpolymer SME (trade names, manufactured by Sekisui Chemical Co., Ltd.), Finepearl PB, Finepearl PM (trade names, manufactured by Sumitomo Chemical Co., Ltd.), SPG type, SP type (trade names, manufactured by Soken Chemical Co., Ltd.), and other thermoplastic resin beads. 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 Epostor L (trade name, manufactured by Nippon Shokubai Co., Ltd.), Bellpearl R, Bellpearl H, and Bellpearl C (trade name, manufactured by Air Water Bellpearl Co., Ltd.).

[0030] 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.

[0031] 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.

[0032] <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.

[0033] 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).

[0034] <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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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. [Examples]

[0040] The following describes embodiments of this disclosure, but this disclosure is not limited to these embodiments.

[0041] (Preparation of powder coatings) The raw materials (resin, pigment, curing agent, additives, 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.

[0042] [Table 1]

[0043] 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) 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)

[0044] (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.

[0045] [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.

[0046] [Water absorption measurement] After pre-measuring the weight of the test boards for each example and comparative example, three polypropylene cylinders (inner diameter 3 cm, height 3 cm) were placed on a painted surface (10 cm x 15 cm). 10 g of water was added to each cylinder, and the weight of the test board after adding the water was measured. The cylinders were sealed at the top and maintained at a temperature of 23°C and a relative humidity of 50% for 24 hours. The weight of the test board before the water was recovered was then measured. Next, the added water was recovered, and the weight of the test board after recovery was measured. The amount of water absorbed was calculated based on the following formula (1), which takes evaporation into account. The results are shown in Table 2. Water absorption amount (mg / 21.2cm 2 ) = ((Weight of test plate after retrieval) - (Weight of test plate before insertion)) - ((Weight of test plate after insertion) - (Weight of test plate before retrieval)) (1)

[0047] [Maximum heat flux QMAX of the test plate] The maximum heat flux QMAX of the test plate was measured using a ThermoLab KES-F7 (manufactured by Kato Tech) as follows: After holding the test plate in a constant temperature bath to maintain a stable temperature of 25°C ± 0.5°C for more than one hour, a heating plate set to 36°C was used to measure 10 gf / cm². 2 The plates were brought into contact, and QMAX was measured. As the heating plate, a 0.5 mm thick layer of chloroprene rubber was attached to the surface of a pure copper plate that was in contact with the copper plate. The results are shown in Table 2.

[0048] [Dynamic friction coefficient, static friction coefficient] Using a multi-functional static-dynamic friction measuring instrument TL-201Tt (manufactured by Trinity Lab Co., Ltd.), the static and dynamic friction coefficients of the test plates for each example and comparative example were measured using a tactile contact that mimicked a fingerprint pattern. The measurement conditions were: load: 50g, speed: 10mm / s, and measurement distance: 40mm. The results are shown in Table 2.

[0049] [Evaluation of tactile sensation (smoothness)] Ten subjects touched the surface of the test plates for each example and comparative example, and each subject evaluated the tactile sensation according to the following evaluation criteria. The average of the above evaluation results is shown in Table 2. An evaluation result of 4 or higher in Table 2 was considered a pass.

[0050] (Evaluation Criteria) 5: Feels smooth and dry 4: I'd say it feels rather smooth. 3: It feels either smooth or sticky. 2: I would say it feels rather sticky. 1: Feels sticky

[0051] [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.

[0052] (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.)

[0053] [Table 2]

[0054] The results shown in Table 2 clearly demonstrate that the test panels for each embodiment exhibit more favorable design and tactile properties compared to the test panels for the comparative examples. [Explanation of Symbols]

[0055] 200 Stairs (building materials), 300 Doors (building materials), 100 Handrails (building material parts), 6 Exterior door handles (building material parts), 7 Interior door handles (building material parts)

Claims

1. A building material component having a coating film formed on at least a portion of its surface, 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 having 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.

2. The coating film of the building material component, whose surface temperature is set to 25°C, is heated by a heating plate set to 36°C at a rate of 10 gf / cm². ２ The maximum heat flux QMAX when in contact is 0.26 W / cm². ２ The following: The building material component according to claim 1, wherein the heating plate is a pure copper plate on which a 0.5 mm thick chloroprene rubber is attached to the surface that comes into contact with the coating film.

3. The water absorption capacity of the aforementioned coating film is 50 mg / 21.2 cm. ２ The building material component according to claim 1 or 2.

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

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

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

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