JP2007021770A - Antibacterial electromagnetic wave shield laminate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily provide an electromagnetic wave shield laminate showing stable antibacterial properties over a long period of time at a low cost using only a natural material without using a synthetic resin or the like. <P>SOLUTION: The antibacterial electromagnetic wave shield laminate is equipped with a substrate layer, the electromagnetic wave shield layer, which contains a metal showing antibacterial properties, formed on the substrate layer and the finish material layer, which mainly contains a porous raw material, formed on the electromagnetic wave shield layer. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electromagnetic wave shield laminate having antibacterial properties and electromagnetic wave shielding properties.

In recent years, with the widespread use of various electronic devices such as mobile phones, there is a concern about the influence of electromagnetic waves leaking from them on the human body and other electronic devices. Therefore, a conductive metal layer such as a metal plate or a metal mesh is used as an electromagnetic wave shielding layer, and this is disposed around an object or place where it is not desired to be affected by an electromagnetic wave source or electromagnetic wave to shield the electromagnetic wave. It has been broken. For example, in the building field, an electromagnetic wave shielding layer is formed on a wall surface such as a wall or a ceiling to shield external electromagnetic waves. (See Patent Documents 1 and 2)
Moreover, the nonwoven fabric for interior building materials which consists of an electromagnetic wave shield decorative sheet (patent document 3) formed by forming an antibacterial synthetic resin layer on the surface of the electromagnetic wave shield layer and silver-coated fiber, and has antibacterial properties, charging properties and electromagnetic wave shielding effects Building materials having both electromagnetic shielding properties and antibacterial properties, such as (Patent Document 4), have also been developed.
Japanese Utility Model Publication No. 62-49547 Japanese Utility Model Publication No. 1-65196 Japanese Patent Laid-Open No. 10-217397 JP-A-4-109698

  The building material having both electromagnetic shielding properties and antibacterial properties is suitable for medical facilities and public facilities. However, the use of synthetic resin for the building material is not desirable in consideration of recent environmental and resource problems. In other words, it has been pointed out that synthetic resin products have poor recyclability, and a small amount of chemical substances volatilized therefrom can cause a disease called so-called chemical hypersensitivity or sick house syndrome, which adversely affects the human body.

  In addition, the synthetic resin layer to which the above antibacterial agent is added is costly and labor-intensive for the addition of the antibacterial agent, and because it is formed on the surface, it is easily exposed to light and heat, and has stable antibacterial properties over a long period of time. Cannot be maintained, and this is the same for nonwoven fabrics for interior building materials made of silver-coated fibers.

  In view of the above, an object of the present invention is to provide an electromagnetic wave shield laminate that exhibits stable antibacterial properties easily and at low cost using only natural materials without using a synthetic resin or the like.

  As a result of intensive investigations to solve the above problems, the applicant has formed an electromagnetic wave shielding layer containing a metal exhibiting antibacterial properties and a finishing material layer mainly containing a porous raw material on the underlying layer in order. Since the bacteria attached to the surface of the finishing material layer (the surface of the laminate) can move to the surface of the electromagnetic shielding layer containing antibacterial metal through the pores inside the finishing material layer, the electromagnetic shielding layer is antimicrobial. It has been found that it can also be used as an active layer, and has led to the present invention.

  That is, the present invention is characterized by the following items (1) to (4).

(1) an underlayer, an electromagnetic wave shielding layer formed on the underlayer and containing a metal exhibiting antibacterial properties, a finishing material layer formed on the electromagnetic wave shielding layer and mainly containing a porous raw material,
An antibacterial electromagnetic wave shield laminate comprising:

  (2) The antibacterial electromagnetic wave shield laminate according to the above (1), wherein the antibacterial metal is at least one selected from the group consisting of silver, copper, zinc and aluminum.

  (3) The antibacterial electromagnetic wave shield laminate according to (1) or (2), wherein the porous material is at least one selected from the group consisting of shirasu, mullet, diatomaceous earth, and shell powder. .

  (4) The antibacterial electromagnetic shield laminate according to (1) or (2), wherein the finishing material layer is made of an inorganic finishing material containing shirasu as a main component.

  According to the present invention, it is possible to easily and cost-effectively only a natural material without using a synthetic resin or the like only by forming an anti-bacterial electromagnetic shielding layer and a finishing material layer mainly containing a porous raw material on the base layer. It is possible to provide an antibacterial electromagnetic wave shield laminate exhibiting stable antibacterial properties and a high electromagnetic wave shielding effect. That is, in the laminate of the present invention, since the electromagnetic wave shielding layer can function as an antibacterial electromagnetic wave shielding layer, it is possible to save the cost and labor of separately providing antibacterial properties to the finishing material layer, and the finishing material layer. Since it plays a role of protecting the antibacterial electromagnetic wave shielding layer, it becomes possible to maintain a stable antibacterial property over a long period of time.

  Further, the antibacterial electromagnetic wave shield laminate of the present invention is excellent in humidity control, heat insulation, sound absorption, deodorization, etc. because the finishing material layer is porous. It is suitable as a building material such as an interior material in other public facilities.

  The present invention comprises an underlayer, an electromagnetic wave shielding layer formed on the underlayer and containing a metal exhibiting antibacterial properties, and a finishing material layer formed on the electromagnetic wave shielding layer and mainly containing a porous raw material. The antibacterial electromagnetic wave shield laminate is characterized.

  The base layer is not particularly limited as long as an electromagnetic wave shielding layer can be formed, for example, gypsum board, plywood board, concrete board, water-resistant plywood for mortar, or asbestos board, in addition to known building materials, paper, Examples include fabrics and films.

  The electromagnetic wave shielding layer is not particularly limited as long as it contains a metal that exhibits conductivity and exhibits antibacterial properties, and is known as an electromagnetic wave shield, such as a metal plate, a metal net, a metal foil, and a metal-containing coating film. By using, construction cost can be reduced. Moreover, although it does not specifically limit as a metal which shows electroconductivity and antibacterial property, For example, silver, copper, zinc, aluminum etc. can be mentioned, These may be individual or may be contained 2 or more types. .

  Moreover, the method of forming an electromagnetic wave shielding layer can be suitably performed by a well-known method according to the form of an electromagnetic wave shielding layer, a construction location, etc., and is not specifically limited. For example, when the electromagnetic wave shielding layer is a metal plate, it may be fixed on the base layer with an adhesive or a fixing bracket. When the electromagnetic wave shielding layer is a metal-containing coating film, the metal-containing paint is set to a predetermined thickness. It may be formed by coating and drying on the base layer.

  The thickness of the electromagnetic shielding layer is not particularly limited as long as it can shield electromagnetic waves, but it is preferably in the range of 1 μm to 1 mm in consideration of the electromagnetic shielding effect, workability, cost, and the like. .

  The finishing material layer is not particularly limited as long as it mainly contains a porous raw material. By mainly containing the porous raw material, the finishing material layer has a large number of holes connecting the surface of the electromagnetic wave shielding layer (the surface in contact with the finishing material layer) and the surface of the finishing material layer (the outer surface of the laminate). The bacteria can move through the holes. Although it does not specifically limit as said porous raw material, For example, shirasu, mullet, diatomaceous earth, shell powder, etc. which have many holes about several nm-several dozen micrometer can be used. Among these, when an inorganic finishing material containing shirasu as a main raw material is used, a synergistic effect due to the antibacterial property possessed by shirasu itself can be expected, and further, the negative ion generation effect can be enjoyed. More preferably, in addition to Shirasu as the main raw material, inorganic finishing materials including a binder such as cement and gypsum, a clay material for imparting elasticity, a Shirasu balloon, an adhesive reinforcing material, etc. Kirishima wall "(manufactured by Takachiho Co., Ltd., trade name, finishing material for inorganic building containing shirasu).

  The finishing material layer is formed, for example, by a method of applying and drying a finishing material mainly containing a porous raw material on the electromagnetic wave shielding layer, or fixing a finishing material panel mainly containing a porous raw material on the electromagnetic wave shielding layer. be able to. Moreover, the thickness of the said finishing material layer is although it does not specifically limit, It is preferable that it is the range of 5-200 mm, and it is more preferable that it is the range of 30-100 mm. If the thickness of the finishing material layer is less than 5 mm, the role of protecting the design of the wall surface and the electromagnetic wave shielding layer tends to be reduced, and various characteristics obtained by being porous are also reduced. There is a tendency. On the other hand, when the thickness exceeds 200 mm, the ratio of the holes connecting the electromagnetic wave shielding layer and the surface of the finishing material layer is decreased, the antibacterial property tends to be decreased, and the workability is further decreased and the cost is increased.

  The antibacterial electromagnetic wave shield laminate of the present invention has a predetermined shape and size even when an antibacterial electromagnetic wave shield layer and a porous finishing material layer are sequentially laminated on a building wall surface as an underlayer. A panel shape in which an antibacterial electromagnetic wave shielding layer and a porous finishing material layer are sequentially laminated on a base layer panel having the above structure may be used. In the case of a panel shape, this can be fixed at a desired position on the building wall surface.

  Hereinafter, the present invention will be described in more detail by way of examples.

Example 1
<Preparation of antibacterial electromagnetic shielding panel>
As an underlayer, an electromagnetic wave shielding paint containing silver (trade name SE-160R, manufactured by Kogyo Sangyo Co., Ltd.) is applied onto a 10 mm thick plaster board so that the dry weight is 300 g / m ² (twice applied). After drying to form an electromagnetic shielding layer, an inorganic finishing material, Naka-Kirishima wall (trade name, manufactured by Takachiho Co., Ltd.) is applied onto the electromagnetic shielding layer, dried, and a finishing material layer having a thickness of 5 mm. By forming, an antibacterial electromagnetic wave shield laminate panel was produced.

<Evaluation of electromagnetic shielding properties>
The laminate panel obtained above was evaluated for electromagnetic wave shielding performance by the insertion loss method based on MIL-STD-285 based on the “Method for measuring electromagnetic shielding performance at the building site” formulated by the Architectural Institute of Japan. did.

  As a result, as shown in FIG. 1, electromagnetic shielding properties above the average were confirmed in a wide frequency band.

<Evaluation of antibacterial properties>
The finish panel of the sample panel prepared by cutting the laminate panel obtained above to 50 mm × 50 mm is irradiated with UV to sterilize the surface, and then the surface of the finish layer is Petri dish. In this state, the cells were cultured under conditions of a temperature of 35 ° C. and a relative humidity of 90% or more for 24 hours, and then the number of viable bacteria was confirmed. The number of viable cells was confirmed by washing the surface of the finishing material layer of the sample with 10 ml of the bacterial solution collection SCDLP medium, collecting the bacterial solution, and culturing it on a standard agar medium at 35 ° C. for 48 hours.

  Moreover, antibacterial evaluation was similarly performed about the panel (underlayer + finishing material layer) produced like Example 1 except not having formed an electromagnetic wave shielding layer (comparative example 1).

  Furthermore, the antibacterial evaluation was performed in the same manner as above for the sample panel in which the surface of the panel (finishing material layer surface) prepared in Example 1 was covered with a sterilized polyethylene film and the holes of the finishing material layer were closed (Comparison) Example 2, E. coli only).

The results of antibacterial evaluation are shown in Table 1.

  From Table 1, it can be seen that the sample of Example 1 exhibits excellent antibacterial properties as compared with the samples of Comparative Examples 1 and 2.

2 is a graph showing the electromagnetic shielding performance of the antibacterial electromagnetic shielding panel produced in Example 1.

Claims (4)

An underlayer,
An electromagnetic wave shielding layer formed on the underlayer and containing a metal exhibiting antibacterial properties;
A finishing material layer formed on the electromagnetic shielding layer and mainly including a porous raw material;
An antibacterial electromagnetic wave shield laminate comprising:   The antibacterial electromagnetic wave shield laminate according to claim 1, wherein the antibacterial metal is at least one selected from the group consisting of silver, copper, zinc and aluminum.   The antibacterial electromagnetic wave shield laminate according to claim 1 or 2, wherein the porous raw material is at least one selected from the group consisting of shirasu, mullet, diatomaceous earth, and shell powder.   The antibacterial electromagnetic wave shield laminate according to claim 1, wherein the finishing material layer is made of an inorganic finishing material containing shirasu as a main component.

Images