JPH0518098U - Electromagnetic wave shield wallpaper - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a wallpaper having a good electromagnetic wave shielding effect. [Structure] A base material 1 is laminated with a conductive paper 3 containing conductive fibers in which synthetic fibers are coated with two layers of copper and nickel, and a capsule foaming agent and a non-migrating plasticizer are used for foaming. The resin layer 4 is provided, and the surface thereof is subjected to printing, embossing 5 and the like as required.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a wallpaper as an interior material, and more particularly to a wallpaper having an electromagnetic wave shielding effect.

[0002]

[Prior Art]

 In recent years, with the rapid development of electronic devices, electromagnetic interference that causes malfunctions of computers and industrial robots in factories has become a serious problem, and it is urgently needed to address it.

As a method of preventing this electromagnetic interference, for example, it is possible to use an electrically conductive material as an interior material of a room in which electronic equipment and the like are installed to prevent unwanted radio waves from entering from the outside. It is considered. For example, Japanese Laid-Open Patent Publication No. 63-199499 discloses an electromagnetic wave shielding interior material comprising a surface layer made of a plastic film, paper or the like, and a back side paper made by mixing conductive fibers.

[0004]

[Problems to be solved by the device]

 However, when it is used as an interior material, especially as a wallpaper, it is difficult to pick up the base of the adherend (wall surface), and the dimensional stability is excellent so that the seams do not open after the construction has elapsed It is required that there is no peeling. Furthermore, it is required that even if the surface is printed or heat-embossed in order to impart a design property as wallpaper, it does not adversely affect the essential electromagnetic wave shielding effect.

Heretofore, no one has been known that has an excellent electromagnetic wave shielding effect, satisfies the above-mentioned various conditions, and sufficiently has a function as a wallpaper.

The present invention has been made in view of the above problems to be solved, and an object thereof is to provide a wallpaper having a good electromagnetic wave shielding effect.

[0007]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the electromagnetic wave shield wallpaper of the present invention is obtained by laminating a conductive paper containing conductive fibers in which synthetic fibers are coated with two layers of copper and nickel on a base material, and encapsulating the conductive paper. It is characterized in that a foamed resin layer using an agent and a hard-to-migrate plasticizer is provided, and the surface thereof is subjected to printing, embossing, etc., if necessary.

Hereinafter, the present invention will be described in more detail.

FIG. 1 is a sectional view showing an example of the construction of the electromagnetic wave shield wallpaper of the present invention. In this configuration, the conductive paper 3 as the shield material is laminated on the base material 1 via the adhesive layer 2, and the foamed resin layer 4 containing the capsule foaming agent, the plasticizer, etc. is provided thereon, and further, the The surface is provided with embossing 5 for imparting a design property.

As the base material 1, any material generally used as a base material for wallpaper materials such as backing paper can be used.

The conductive paper 3 contains at least conductive fibers in which a core made of synthetic fibers is coated with two layers of copper and nickel, and contains thermoplastic synthetic pulp, core-sheath type composite fibers and the like. To be done.

The synthetic fiber used for the core of the conductive fiber has an average fiber length of 2 mm or less, a fiber diameter of 1 to 3 denier, and an aspect ratio (fiber length / diameter) of 20 to 200, which is a relatively short fiber length. It is a thermoplastic synthetic fiber such as nylon fiber, polyester fiber, vinylon fiber or acrylonitrile fiber.

The conductive fiber is a fiber in which the synthetic fiber is coated with copper, and copper is further coated with nickel, and copper and nickel are coated in two layers. The coverage of copper on the synthetic fiber is 20 to 50% by weight, preferably 25 to 50% by weight, and more preferably 35 to 50% by weight. The coverage with nickel may be such that the oxidation of copper can be prevented, and is usually 5 to 20% by weight.

Chemical copper plating is usually adopted for the copper coating of the synthetic fiber, and electroplating or chemical plating can be adopted for the nickel coating, and they can be used together. Usually, electroplating is preferably used.

The thermoplastic synthetic pulp is a papermaking material obtained by processing a thermoplastic synthetic resin such as polyethylene, polypropylene, polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol, etc. into a fibrous shape.

The core-sheath type composite fiber is a fiber in which two kinds of synthetic resins having different melting points are compounded in a core-sheath type. For example, polypropylene fiber or the like having a relatively high melting point is used as the core fiber, and Also, it is a fiber having a low melting point, for example, a composite made of polyethylene, ethylene-vinyl acetate copolymer, etc. as a sheath.

The conductive paper 3 contains the above-mentioned conductive fibers, thermoplastic synthetic pulp, core-sheath type composite fibers, etc., and if desired, various additives are added thereto, and the paper is obtained by papermaking by a conventional method. ..

The content of the conductive fibers in the conductive paper varies depending on the aspect ratio of the conductive fibers and the metal coverage, but is preferably 3 to 60% by weight on a dry basis. In particular, in order to obtain a high electromagnetic wave shielding property, it is preferably 20 to 60% by weight, more preferably 30 to 60% by weight.

As a method of laminating the base material 1 and the conductive paper 3, for example, polyethylene ruder laminating using polyethylene synthetic pulp internally added to the conductive paper 3 can be adopted. In this case, the adhesive layer 2 of FIG. 1 is polyethylene.

The foamed resin layer 4 is formed by applying a resin containing a capsule foaming agent, a plasticizer or the like by a known coating method or a printing method, and heating this to foam the capsule foaming agent. You can Capsule foaming agents are capable of low temperature foaming (below 150 ℃), have strong embossing pressure, and have good dimensional stability over time.

The capsule foaming agent used is hollow particles of a thermoplastic resin, and a volatile substance (for example, a volatile hydrocarbon such as isobutane) is enclosed in the hollow portion. A vinylidene chloride-acrylonitrile copolymer or the like is used as the resin forming the capsule. The capsule preferably has a particle size of 5-20 μm. Such a capsule foaming agent foams due to volatilization of the volatile substance enclosed by heating. Commercially available products include "EXPANCEL (trade name)" manufactured by Nippon Ferrite Co., Ltd. and "Micropearl (trade name)" manufactured by Matsumoto Yushi-Seiyaku Co., Ltd.

A vinyl chloride resin or the like is suitable as a resin forming the foamed resin layer 4.

In the present invention, the amount of the capsule foaming agent added to the resin is preferably 5 to 15 parts by weight based on 100 parts by weight of the vinyl chloride resin, and the coating amount of the resin is 150 to 300 g / It is preferably m ² .

In addition to the capsule foaming agent, the above resin contains additives such as a plasticizer, a stabilizer, and a flame retardant.

As the plasticizer in the present invention, in order to prevent the adhesive strength between the foamed resin layer 4 and the conductive paper 3 from being lowered with the passage of time, a plasticizer with less exudation, that is, a migration-resistant plasticizer is used. Specifically, a polyester plasticizer or the like can be used. For such a purpose, the plasticizer is preferably used in the range of 30 to 60 parts by weight with respect to 100 parts by weight of the resin.

The method of heating and foaming the capsule foaming agent is arbitrary, for example, placing it in a heating furnace.

The film thickness of the foamed resin layer 4 is preferably about 0.5 to 1.0 m / m in terms of film thickness after foaming in order to give a three-dimensional effect.

The surface of the foamed resin layer 4 can be given a design expression by appropriately performing printing, embossing, or the like.

[0029]

【Example】

 Hereinafter, the present invention will be described in more detail with reference to specific embodiments of the present invention.

After laminating the conductive paper on the backing paper for wallpaper with polyethylene ruder laminate, both ears were slit so that polyethylene would not stick out from the ears (polyethylene coating amount 20 g / m ² ). Conductive paper is made of polyester fiber with an average fiber length of 2 mm or less and an aspect ratio of 47, electroless plated with copper and nickel, 45% by weight of conductive fiber, 30% by weight of polyethylene synthetic pulp, and polypropylene as a core fiber. Paper-made paper containing 15% by weight of core-sheath type composite fiber having polyethylene as a sheath and 10% by weight of hemp was used.

Next, the above conductive paper was coated with a vinyl chloride resin sol having the following composition, followed by heat foaming and embossing to obtain a wallpaper of the present invention.

Vinyl chloride resin blend (unit is parts by weight) Vinyl chloride resin 38J (manufactured by Zeon Corporation) 100 Plasticizer DINP (manufactured by Sekisui Chemical Co., Ltd.) 55 Unequipped Whiten H (manufactured by Shiraishi Industry Co., Ltd.) 30 Stabilizer KR- 69A-10 (manufactured by Kyodo Pharmaceutical Co., Ltd.) 3 Titanium ^# 1017 (manufactured by Nikko Vix) 16 Capsule foaming agent ^# 051 (manufactured by Expancel) 10 Flame retardant BC-50 (manufactured by Maruzen Yuka Co., Ltd.) 7 Diluent D -40 (manufactured by Exxon Chemical Co., Ltd.) 10

The shielding effect of the obtained wallpaper was measured by a proximity electric field measurement (ASTM method) specified in ASTM ES7-83 and a proximity electric field measurement (Advantest method) using TR17301 manufactured by Advantest Corporation. And the results shown in FIG. 3 were obtained. From this result, it can be seen that the wallpaper of the present invention has an effect of 40 dB (shield rate 99%) or more in the frequency range of 0 to 1000 MHz. Further, even with the change over time, there was no problem such as peeling due to a decrease in the adhesive strength between the conductive paper 3 and the foamed resin layer 4.

[0034]

[Effect of the device]

 As described above in detail, the electromagnetic wave shield wallpaper of the present invention has an excellent electromagnetic wave shield effect and also has a sufficient function as a wallpaper.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a configuration example of an electromagnetic wave shield wallpaper of the present invention.

FIG. 2 is a characteristic diagram showing an electromagnetic wave shielding effect measured by an ASTM method.

FIG. 3 is a characteristic diagram showing an electromagnetic wave shielding effect measured by the Advantest method.

[Explanation of symbols]

 1 Base Material 2 Adhesive Layer 3 Conductive Paper 4 Foamed Resin Layer 5 Embossing

Continuation of front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location H05K 9/00 N 7128-4E

Claims (1)

[Scope of utility model registration request] 1. A conductive paper containing conductive fibers in which synthetic fibers are coated with two layers of copper and nickel is laminated on a substrate, and a foaming agent using a capsule foaming agent and a non-migrating plasticizer is laminated thereon. An electromagnetic wave shield wallpaper, which is provided with a resin layer, and whose surface is subjected to printing, embossing, and the like as necessary.