JP2022156545A - Metal plate for building material, and laminate for building material using the same - Google Patents

Abstract

To provide a metal plate for a building material having excellent antiviral performance, and a laminate for a building material using the same.SOLUTION: A laminate for a building material is formed by laminating a metal plate 10 for a building material which is a copper stainless steel plate containing 3.6-4.5 mass% Cu, 8.5-10.0 mass% Ni and 18.0-20.0 mass% Cr, and has surface roughness (maximum height roughness) Rz of 0.17 μm or less, a synthetic resin-made copper material 20 and a rear face plate 30, thereby the side of the metal plate 10 for the building material exhibits excellent antiviral performance, and accordingly can be used as a building material excellent in antiviral performance by using the side of the metal plate 10 for the building material as a surface side.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention mainly relates to a metal plate having antiviral properties that can be used for indoor interior decoration and building materials, and a building material laminate using the same.

BACKGROUND ART Conventionally, metal plates have been used as building materials for finishing and decorating interiors of buildings, for example, walls and ceilings. As for the material, there are cases in which a metal plate is directly installed on a wall surface or the like, and there are cases in which a laminate obtained by laminating a metal plate on a resin plate is used. As for the shape, it may be used as a flat plate for the entire wall surface, or may be used for a part of the wall surface such as a so-called baseboard or joint material. As described above, building materials are used in various forms depending on installation locations and applications.

A building manager, a user, or the like may directly touch such a building material. If touched with a hand, not only will fingerprints remain on the touched area, but if the user's sweat adheres to the touched area, that area may discolor and deteriorate its appearance. On the other hand, due to the recent increase in hygiene awareness, there is a demand for imparting antibacterial performance and antiviral performance to parts that are touched by hands.

Examples of metal plates used as building materials include aluminum alloys, stainless alloys, titanium alloys, and copper alloys. Aluminum alloys, stainless steel alloys, and titanium alloys differ depending on the polishing state of the surface, for example, hairline finish or mirror finish, but in general fingerprints are less likely to remain when touched, and even if fingerprints remain, they can be wiped off. many. On the other hand, antibacterial performance and antiviral performance are usually not exhibited.

Copper alloys are known as brass, bronze, cupronickel, nickel silver, etc., depending on the alloying ingredients, and such alloys containing a large amount of copper are known to have antibacterial and antiviral properties. On the other hand, even in a normal installation state, the surface often rusts gradually and becomes discolored.

In order to solve these problems, Patent Literature 1, for example, proposes a stainless steel sheet having antibacterial properties by adding a predetermined amount of copper as an alloy component.

JP-A-2005-105412

By the way, the stainless steel plate described in Patent Document 1 does not mention antiviral performance. Therefore, it was not clear whether it has antiviral performance like the above-mentioned copper alloy, and even if it has antiviral performance, to what extent it has antiviral performance.

The present invention solves the above problems and provides a metal sheet for building materials having excellent antiviral performance, and a laminate for building materials using the same.

In order to solve the above problems, the present inventors conducted extensive research and found that stainless steel (hereinafter referred to as "copper stainless steel") containing a predetermined amount of copper as an alloy component has a predetermined antiviral performance. In addition, it was found that the antiviral performance differs depending on the polished state of the surface. Moreover, when the surface roughness is smaller than a predetermined value, that is, when the surface becomes smoother, the inventors have learned that the antiviral performance is significantly improved, and have completed the present invention.

That is, the metal plate for building materials according to the present invention is copper containing 3.6 to 4.5% by mass of Cu, 8.5 to 10.0% by mass of Ni, and 18.0 to 20.0% by mass of Cr. The stainless steel plate is characterized in that the surface roughness (maximum height roughness) of the copper stainless steel plate is Rz=0.17 μm or less.

Moreover, the laminate for building materials according to the present invention is obtained by laminating the metal plate for building materials, the core material made of synthetic resin, and the back plate.

According to the metal sheet for building materials of the present invention, even if a virus adheres to the surface of the metal sheet for building materials, it will be deactivated after a predetermined period of time. It is possible to reduce the possibility that an active virus will attach even if it is attached. Moreover, since the surface roughness is a degree of smoothness corresponding to so-called mirror finish, it has excellent decorativeness as a building material.

According to the laminate for building materials of the present invention, the metal plate for building materials having antiviral performance may be used on the front surface side of the building material, and the back surface plate may be arranged on the wall surface side. If the finish is different from that of the metal plate for building materials, it is easy to distinguish the front and back from the appearance, and it is difficult to mistake the front and back during construction.

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which shows one embodiment of the laminated body for building materials which concerns on this invention.

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be specifically described below based on the drawings.
FIG. 1 is a cross-sectional view showing an embodiment of a laminate for building materials according to the present invention. A building material laminate 100 is obtained by laminating a building material metal plate 10 made of a copper stainless steel plate, a synthetic resin core material 20 and a back plate 30 in this order. The material 20 and the synthetic resin core material 20 and the back plate 30 are adhered via adhesive layers. The thickness of the building material laminate 100 is preferably about 1 to 5 mm, the thickness of the core material 2 is 1 to 4 mm, and the thickness of the metal plate 10 for building materials and the stainless steel plate 30 is 0.1 to 1.5 mm. is preferred.

The metal plate 10 for building materials is made of a copper stainless steel plate, and has a main component composition of 3.6 to 4.5% by mass Cu, 8.5 to 10.0% by mass Ni, and 18% Cr. 0 to 20.0% by mass.

In this embodiment, the core material 20 is formed by extrusion molding, and the synthetic resin used for the core material is polyethylene. In addition to polyethylene, examples of the synthetic resin used for the core material include polypropylene, ABS resin, AAS resin, and polyvinyl chloride resin. In addition, fillers such as talc, calcium carbonate, aluminum hydroxide, magnesium hydroxide, wood powder, and the like may be appropriately added to the synthetic resin.

As the back plate 30, in this embodiment, SUS304 defined by JIS G 4305 is used, but it is not limited to this, and other stainless steel plates such as SUS314 and SUS430 can be used. can. A copper stainless steel plate may be selected as the back plate 30. However, when the laminate for building materials 100 is attached to the interior of a building, for example, to a wall surface, the stainless steel plate 30 side is the wall surface side, so users and Since it is not touched by passers-by and does not need to have antiviral performance, the above SUS304 can be used. Also, if the surface roughness of the back plate is different from that of the copper stainless steel plate, the front and back can be easily distinguished from each other.

The metal plate 10 for building materials and the core material 20 are adhered via an adhesive layer in this embodiment. The adhesive layer may be formed by applying an adhesive such as urethane or epoxy during or after molding of the core material 20 . In this embodiment, since polyethylene is used as the core material 20, the adhesive layer is formed of an adhesive resin based on a polyolefin resin or a resin highly compatible with the polyolefin resin.

The back panel 30 and the core material 20 are adhered via an adhesive layer in this embodiment. As the adhesive layer, the same adhesive as the adhesive for bonding the metal plate 10 for building materials and the core material 20 can be used.

As described above, since the metal plate for building materials 10 contains Cu as a component composition, antibacterial performance and antiviral performance can be expected. The expression of such performance is mainly due to the elution of the Cu component and the change in the valence of the Cu component. It is thought to be derived from the ingredients.

In addition, it is considered that the metal plate 10 for building materials having a higher surface roughness is more likely to exhibit the above effects. However, as a result of intensive research, the inventors of the present invention have found that the antiviral performance varies depending on the roughness of the surface, specifically the polished state of the surface. Moreover, when the surface roughness is smaller than a predetermined value, in short, the surface approaches a smoother state, so that the antiviral performance is significantly improved, and the present invention has been completed.

There are various indices that express surface roughness, but a representative one is maximum height roughness (Rz value; sum of the maximum values of depth). It has been found that when the Rz value is equal to or less than a predetermined value, the antiviral performance is significantly increased. When the Rz value is 0.17 μm, the antiviral performance is significantly improved. In order for the Rz value to be 0.17 μm, the surface corresponds to a polished surface polished with an abrasive having a particle size of No. 800, which is a surface corresponding to a so-called mirror surface.

The surface roughness was measured according to JIS B 0633:2001 (Product Geometric Characteristic Specification (GPS)-Surface Texture: Contour Curve Method-Surface Texture Evaluation Method and Procedure). Specifically, with a surface roughness shape measuring instrument (Surfcom 130A, manufactured by Tokyo Seimitsu Co., Ltd.), one direction of the plate material and the other direction, which is substantially orthogonal, are measured at 10 points each, and the average value was calculated as the surface roughness (Rz value) in each direction. Furthermore, the value calculated by averaging the average values was defined as the surface roughness (Rz value) of the metal plate 10 for building material.

The antiviral performance test was conducted in accordance with JIS R1756 (Fine ceramics-Antiviral test method for visible light responsive photocatalyst material-Method using bacteriophage Qβ) in the dark.

Next, examples of the metal plate 10 for building material according to the present invention are shown.

(Example 1)
The metal plate 10 for building materials is a copper stainless steel plate having a thickness of 1 mm and a surface roughness equivalent to No. 800, and the surface thereof is polished with an abrasive having a grain size of No. 800.

(Measurement of surface roughness)
A size of 70×150 mm was cut out from the metal plate 10 for building materials, and measurements were made at 10 points each in the length direction and the width direction of the polished surface. The average value in each direction was calculated and used as the surface roughness (Rz value). Table 1 shows the results.

(Antiviral performance test)
As described above, it was carried out according to JIS R1756 (dark conditions). Specifically, a 50 mm square was cut out from the metal plate 10 for building materials and used as a test sample. The test sample was placed in a sterile plastic Petri dish and inoculated with 150 μl of a pre-prepared test bacteriophage solution (3.8×10 6 pfu/ml). This test sample was allowed to stand for 60 minutes in a thermostatic chamber adjusted to 37° C., and the bacteriophage infectivity titer was measured and the antiviral activity value was calculated.

(Comparative example 1)
Using a copper stainless steel plate having a thickness of 1 mm and a surface roughness equivalent to No. 400 as Comparative Example 1, the surface roughness was measured and the antiviral performance test was performed in the same manner as in Example 1. Table 1 shows the results.

(Comparative example 2)
Using a polyethylene terephthalate (PET) film with a thickness of 100 μm to which no antiviral performance was imparted as Comparative Example 2, an antiviral performance test was conducted in the same manner as in Example 1. Table 1 shows the results.

The antiviral infection titer was calculated based on the following formula. Table 1 shows the results.
Mv= _log10 (B/C)
Mv: Antiviral activity value B: Bacteriophage infectivity titer after the antiviral performance evaluation test of Comparative Example 2 (PET film) C: Bacteriophage infectivity titer after the antiviral performance evaluation test of each sample

In Table 1, Example 1 has an antiviral activity value of 2 or more, that is, compared to Comparative Example 2, which is considered to have substantially no antiviral performance when comparing the bacteriophage infectivity titers after the test. It is 1/100 or less, and it is considered to have sufficient antiviral performance. On the other hand, Comparative Example 1 had an antiviral activity value of less than 1. That is, when the bacteriophage infectivity titer after the test was compared, it was less than 1/10 that of Comparative Example 2, and it was clearly not recognized that it had antiviral performance. Thus, it is suggested that the difference in surface roughness causes a large difference in antiviral performance.

However, the present invention is not limited to these embodiments. Various modifications conceived by those skilled in the art are included in the scope of the present invention without departing from the gist of the present invention.

INDUSTRIAL APPLICABILITY The metal sheet for building materials and the laminate for building materials using the same according to the present invention maintain high antiviral performance, so that they can be suitably used as interior materials and ceiling materials for buildings.

10 Metal plate for building materials 20 Core material 30 Back plate 100 Laminate for building materials

Claims (2)

A copper stainless steel sheet containing 3.6 to 4.5% by mass of Cu, 8.5 to 10.0% by mass of Ni, and 18.0 to 20.0% by mass of Cr, wherein the surface of the copper stainless steel sheet A metal sheet for building materials, characterized by having a roughness (maximum height roughness) Rz of 0.17 μm or less. A laminate for building materials, comprising the metal plate for building materials according to claim 1, a synthetic resin core material, and a back plate laminated together.

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