JP2008190317A - Easily executable electromagnetic-wave shielding decorative material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an easily exceutable electromagnetic-wave shielding decorative material facilitating a handling because a metallic foil is not used, facilitating a manufacture because of a simple configuration and also improving the problem of a defective workability due to the difference of flexural strengths among a different kind of laminated materials and the difference of expansions and contractions due to a moisture or the like in the decorative material having an electromagnetic-wave shielding performance used for carrying out an electromagnetic-wave shielding in a room for a building. <P>SOLUTION: In the easily executable electromagnetic-wave shielding decorative material, a decorative resin layer formed by an aqueous emulsion composition mainly comprising an aqueous emulsion resin on the evaporating-surface side is laminated to a paper base-material layer evaporating a metal on one surface. In the decorative material, the thickness of a metal evaporated layer is particularly 0.03 to 500 μm. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a decorative material having electromagnetic wave shielding performance.

  Conventionally, as an electromagnetic shielding method for indoors in buildings, conductive metal foil such as copper foil or aluminum foil is stretched over the walls, floors, and ceilings of the interior, and wallpaper, floor coverings, etc. are applied on it. Methods for constructing materials are known. Further, an electromagnetic wave shielding decorative material in which a metal-deposited polyethylene terephthalate film and a backing paper are previously bonded in this order to the back surface of a decorative material such as ordinary wallpaper is already known.

However, since metal foil is easily damaged and fragile in strength, it requires careful attention and skill in construction and handling. Furthermore, when applying a decorative material on it, there existed a fault which construction time will increase. In addition, a decorative material having a structure in which a metal vapor-deposited film and paper are bonded to the back surface of the decorative material results in an increased manufacturing process and high cost, and the bending strength of each base material is different, so that the weak layer breaks when bent In addition, when construction is performed using a water-based adhesive, there are problems such as difficulty in construction of curls and the like and wrinkles conspicuous after construction because the expansion and contraction due to moisture differs between layers.
Japanese Patent Laid-Open No. 10-217397 JP 2000-54523 A Utility Model Registration No. 2567798

  The present invention solves the above-mentioned problems of the prior art and is easy to handle because it does not use a metal foil. It is easy to manufacture because of its simple structure, and the difference in bending strength between different types of laminated materials. It is an object of the present invention to provide an easy-to-install electromagnetic shielding cosmetic material in which the problem of poor workability due to the difference in expansion and contraction due to moisture and the like is improved.

In the present invention, in order to solve the above problems,
According to the first aspect of the present invention, a decorative resin layer formed of an aqueous emulsion composition mainly composed of an aqueous emulsion resin is laminated on the vapor deposition surface side of a paper base material layer that has been subjected to metal vapor deposition on one side. It is an easy-to-install electromagnetic shielding cosmetic material characterized by being made.

The invention according to claim 2
The easily constructed electromagnetic wave shielding decorative material according to claim 1, wherein the thickness of the metal deposition layer is 0.03 to 500 µm.

According to the present invention, a paper base layer having a metal vapor deposited on one side is easily laminated with a decorative resin layer formed of an aqueous emulsion composition mainly composed of an aqueous emulsion resin on the vapor deposition side. It is possible to obtain an easy-to-install electromagnetic shielding cosmetic material that can be constructed and has an electromagnetic shielding performance of 20 dB or more.

Hereinafter, the present invention will be described in detail.
As the paper base layer used in the present invention, ordinary art paper, coated paper, inorganic paper, flame retardant paper, and the like can be used.

  The metal to be deposited on the paper base layer is not particularly limited as long as it is a material that provides an electromagnetic shielding performance of at least 20 dB or more. For example, aluminum, copper, nickel, or the like can be used.

  Further, the thickness of the deposited layer may be any thickness as long as the electromagnetic shielding performance is 20 dB or more in absolute value (the electromagnetic shielding performance is usually displayed as a negative value, and the higher the absolute value, the better the performance). It is 03 micrometers-500 micrometers. If the thickness is less than 0.03 μm, sufficient electromagnetic wave shielding performance may not be obtained. If the thickness exceeds 500 μm, wrinkles or the like may occur during construction.

The aqueous emulsion composition used for forming the decorative resin layer in the present invention is composed of an aqueous emulsion resin as a main component and appropriately added with a filler, a foaming agent, and other additives as necessary. In the case of wallpaper that is a representative example of the easy-to-install electromagnetic shielding material of the present invention, at least a filler and a foaming agent are often added, as in the case of ordinary wallpaper that does not have electromagnetic shielding performance.

  Although it does not specifically limit as aqueous emulsion resin used by this invention, For example, polymers, such as an acrylate ester and an aromatic vinyl compound, a styrene-butadiene rubber type, a vinyl acetate type, an ethylene-vinyl acetate copolymer, silicone, It is composed of at least one or two or more of polyurethane, polybutene and the like, and is not particularly limited in terms of structure, but an ordinary copolymer or a core / shell two-layer structure, a blend, or the like can be used.

Examples of the filler used in the present invention include aluminum hydroxide, magnesium hydroxide, barium hydroxide, calcium carbonate, magnesium carbonate, calcium sulfate, barium sulfate, silica sand, clay, talc, silicas, and magnesium silicate. . Aluminum hydroxide, magnesium hydroxide, calcium carbonate and the like are preferable. The addition amount of the filler is preferably 50 to 300 parts by weight per 100 parts by weight of the aqueous emulsion resin. When the amount is less than 50 parts by weight, the flame retardant effect does not sufficiently appear. When the amount exceeds 300 parts by weight, the surface strength of the decorative material becomes weak.

As the foaming agent used in the present invention, a microcapsule foaming agent is preferably used. This is because the inside of a hollow shell portion made of polyacrylonitrile, acrylonitrile-methyl acrylate copolymer, methyl methacrylate-acrylonitrile copolymer, etc. is low in ethane, propane, butane, isobutane, pentane, hexane, heptane, etc. It is a sphere having a boiling point hydrocarbon and having a particle diameter of about 2 to 30 μm. The addition amount of the blowing agent is preferably 3 to 20 parts by weight. If it is less than 3 parts by weight, the volume feeling of the foam layer is insufficient, and if it exceeds 20 parts by weight, the surface strength of the foam layer becomes weak.

  The foaming start temperature of the foaming agent is preferably 120 to 180 ° C. When the temperature exceeds 180 ° C., the foaming property is inferior, and the heat energy cost increases. On the other hand, when the foaming start temperature is less than 120 ° C., foaming easily occurs even at a drying temperature for drying the water of the aqueous emulsion composition, and a good foamed layer cannot be obtained.

  You may add additives, such as a coloring agent, a dispersing agent, an antiblocking agent, an antifoamer, a thickener, to the aqueous | water-based emulsion composition used by this invention, for example.

  The easy-to-install electromagnetic shielding composition of the present invention is obtained by applying the above-mentioned aqueous emulsion composition to the metal vapor-deposited surface of the paper base layer described above and foaming by heating to form a decorative resin layer. .

  Examples of the coating method of the aqueous emulsion composition include coating methods such as a knife coater, a nozzle coater, a gravure coater, a rotary screen coater, and a reverse roll coater.

  Furthermore, a pattern is printed on the surface of the aqueous emulsion composition layer by using a gravure printing method, an offset printing method, a screen printing method, etc., with a foaming ink and / or non-foaming ink mainly composed of an aqueous emulsion resin. You may do it.

  As described above, the representative embodiment of the easy-to-install electromagnetic shielding decorative material of the present invention has been described. However, the present invention is not limited to this, and various modifications may be made without departing from the spirit of the present invention. it can.

  The present invention will be described in more detail with reference to the following examples, but the present invention is not limited thereto.

Aluminum is vapor-deposited to a thickness of 1 μm on the surface of flame-retardant paper having a basis weight of 100 g / m ² , and an aqueous emulsion composition having the composition shown in Table 1 below is applied on the vapor-deposited surface to a coating amount after drying of about 100 g. The base layer was obtained by coating with a bar coater so as to be / m ² and drying in an oven at 120 ° C. for 2 minutes. Next, after forming a pattern on the base layer by gravure printing using water-based ink, embossing was performed at 210 ° C. for 30 seconds to obtain an easy-to-install electromagnetic shielding cosmetic material of the present invention.

As a result of measurement in the electromagnetic field frequency range of 0 to 1000 MHz in the proximity electric field measurement specified in ASTM ES7-83 and the proximity electric field measurement using Advantest TR17301, all the frequencies of the easy-to-construct electromagnetic shielding material obtained were measured. The electromagnetic shielding performance (absolute value) was about 20 dB or more.

Moreover, 150g / m ² (wet) of starch paste for wallpaper construction is applied to the back of this easy-to-construct electromagnetic shielding material, and it is applied to the surface of the wall base made of gypsum board. The gap that occurs after the glue is dried between the adhering decorative materials. Adopted at 0.1 mm or less. Adhesion time (after construction, when the decorative material is peeled off, the flame-retardant paper that is the backing paper is paper. The time until it peeled off) and the presence or absence of wrinkles on the surface were evaluated. This evaluation was performed in an environment of 23 ± 3 ° C. and 65 ± 5% RH. The results are shown in Table 2 below.

<Comparative Example 1>
In the said Example 1, the thickness of the vapor deposition layer of aluminum was changed into 0.02 micrometer, and the others were the same conditions as the said Example 1, and obtained the easily-constructed electromagnetic wave shielding cosmetics.

When the electromagnetic shielding performance of the obtained product was measured under the same conditions as in Example 1, it was a value of less than 20 dB for all frequencies. In addition, the evaluation was performed on the opening, adhesion time, and surface wrinkles under the same conditions as in Example 1. The results are shown in Table 2 below.

<Comparative example 2>
In the said Example 1, the thickness of the vapor deposition layer of aluminum was changed into 700 micrometers, and the easy construction electromagnetic shielding cosmetic material was obtained on the same conditions as the said Example 1 except others.

  When the electromagnetic shielding performance of the obtained product was measured under the same conditions as in Example 1, the value was 20 dB or more for all frequencies. In addition, the evaluation was performed on the opening, adhesion time, and surface wrinkles under the same conditions as in Example 1. The results are shown in Table 2 below.

  According to the present invention, a paper base layer having a metal vapor deposited on one side is easily laminated with a decorative resin layer formed of an aqueous emulsion composition mainly composed of an aqueous emulsion resin on the vapor deposition side. It was possible to obtain an easy-to-install electromagnetic shielding decorative material that could be applied and had an electromagnetic shielding performance of 20 dB or more.

Claims (2)

Easily characterized in that a decorative resin layer formed of an aqueous emulsion composition mainly composed of an aqueous emulsion resin is laminated on the vapor-deposited surface side with respect to a paper base material layer that has been subjected to metal vapor deposition on one side. Construction electromagnetic shielding cosmetic material.   The easily constructed electromagnetic wave shielding decorative material according to claim 1, wherein the thickness of the metal vapor deposition layer is 0.03 to 500 μm.