JPS6113698A - Method of producing radio wave absorber - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a method of attaching a radio wave absorber made of a radio wave absorbing material to an adherend, that is, a method of attaching a radio wave absorber made of a radio wave absorbing material to an adherend, that is, radio wave absorption to a metal structure coated with anti-corrosion coating such as a bridge. More specifically, the present invention relates to a method for constructing a radio wave absorber that is excellent in construction properties, has excellent weather resistance and corrosion resistance after construction, and is advantageous in that there is no variation in radio wave absorption performance.

[Prior art]

Conventionally, in order to attach a radio wave absorber to the surface of a metal structure coated with anti-corrosion coating such as a bridge, for example, as shown in FIG. and stick this coated surface to the surface of the metal structure 7 coated with anti-corrosion coating (thickness of radio wave absorbing material 1: 1.98 m).
m), or (2) as shown in FIG.
Then, the adhesive 2 coated surface of the radio wave absorbing material 1 is adhered to the surface of the metal structure 7 via the adhesive layer 4 (thickness of the radio wave absorbing material 1 = 1.97+nm).

However, as is clear from FIG. 5, the +11 method has the disadvantage that the radio wave absorption performance varies as the thickness (μ) of the anticorrosion paint of the metal structure 7 changes, and the method (2) In this case, there will be no variation in the radio wave absorption performance (see Fig. 5), but if the metal structure 7 is a sea bridge with a severe corrosive environment, metal foil (for example, aluminum foil) may be used.
3 is corroded, and the corrosion causes the radio wave absorber to become ineffective. In addition, in FIG. 5, the horizontal axis represents the metal structure 7.
The left vertical axis is the reflection coefficient, the right vertical axis is the reflection loss (dB), ○ is for the method shown in Figure 3, ・ is shown in Figure 4. Each case of the method is shown below.

In addition, conventionally, a galvanized iron plate with a thickness of about 0.2 to 2 mm was fixed to the back side of the radio wave absorbing material in advance, and then mechanically fixed to the bridge surface with bolts, etc., or epoxy or urethane-based A method of bonding with an adhesive has also been used, but this method has disadvantages such as the lack of flexibility in the material, making it difficult to apply to curved surfaces, and the construction is time-consuming.

[Purpose of the invention]

The present invention uses flexible construction materials, so construction is easy;
In addition, after construction, it is not affected by the thickness of the anti-corrosion paint on the metal structure to which it is adhered, and further improves weather resistance.
The purpose of the present invention is to provide a method for constructing a radio wave absorber that has excellent corrosion resistance.

[Structure of the invention]

Therefore, in the present invention, 2 ft of metal coated on both sides with corrosion-resistant plastisota film is laminated on the surface of a metal structure coated with anti-corrosion coating, and a radio wave absorbing material is adhered to the surface of this metal foil. The gist of this article is a construction method for a radio wave absorber characterized by the following.

Hereinafter, the configuration of the present invention will be explained in detail.

In the present invention, a metal foil coated on both sides with a corrosion-resistant plastic film is laminated on the surface of a metal structure that has been subjected to a corrosion-resistant coating. In this case, as shown in Figure 1,
A metal foil 3 whose both surfaces are coated with a corrosion-resistant plastic film 5 may be fixed to the surface of the metal structure 7 which has been coated with a corrosion-resistant coating via an adhesive layer 4 .

The metal structure 7 coated with anti-corrosion coating is not particularly limited, and may be a bridge, a ship, etc., for example.

The metal foil 3 used here may be a foil made of a conductive material such as aluminum, tin, copper, or iron, and its thickness is preferably 8μ or more in view of the influence on radio wave reflection performance and economical efficiency. is preferably 8 to 30μ.

The plastic film 5 may be one with good corrosion resistance, such as polyester film, polyvinyl chloride film, or vinyl film, and from the viewpoint of the influence on radio wave reflection performance and economic efficiency, Its thickness is preferably 100μ or less, preferably 5 to 30μ.

In order to cover both sides of the metal foil 3 with the corrosion-resistant plastic film 5, the metal foil 3 and the corrosion-resistant plastic film 5 may be bonded together with an adhesive having a certain thickness.

For the adhesive layer 4, an adhesive such as an acrylic ester adhesive, a chloroprene rubber adhesive, or a natural rubber adhesive may be used, and it is particularly preferable to use a reactive adhesive.

In the present invention, a radio wave absorbing material is attached to the surface of the metal foil 3 thus laminated. In this case, as shown in FIG. 1, the radio wave absorbing material 1 is
All you have to do is fix it. The adhesive 2 having a constant thickness may be the same as that used for the adhesive layer 4.

The radio wave absorbing material 1 used here may be a general rubber-based radio wave absorbing material, such as rubber-ferrite, rubber-ferrite-carbon, or rubber-carbon. The rubber material may be any polymer with rubber elasticity, but in consideration of weather resistance, adhesion, workability, etc., chloroprene rubber, isobutylene-isoprene copolymer rubber, silicone rubber, chlorosulfonated polyethylene rubber, polyethylene rubber, etc. Ether rubber, polysulfide rubber, polyurethane rubber, acrylic rubber, etc. are suitable. More preferably, it is a blend of these rubbers and is in the form of a room-temperature curing unvulcanized rubber.

In the present invention, an adhesive 2 is applied to a radio wave absorbing material 1 to a certain thickness, and a metal foil 3 whose both sides are covered with a corrosion-resistant plastic film 5 is adhered to the coated surface. It can also be bonded to the metal structure 7 via.

Furthermore, as shown in FIG. 2, a coating material 6 may be applied to all or part of the construction area of the radio wave absorber, thereby preventing corrosion-causing substances such as salt from penetrating into the radio wave absorber. Since this can be prevented, corrosion resistance can be further improved.

[Invention 1) Results] As explained above, according to the present invention, a metal foil coated on both sides with a corrosion-resistant plastic film is laminated on the surface of a metal structure coated with a corrosion-resistant coating. By pasting a radio wave absorbing material on the surface of the device, the following effects can be achieved.

(1) By laminating a corrosion-resistant plastic film on both sides of the metal foil, the corrosion resistance of the metal foil is improved, which improves the stability of radio wave absorption performance over time and the long-term durability when attached outdoors. Two.

(2) Since flexible molding materials such as metal foil ons and radio wave absorbers 4 coated on both sides with corrosion-resistant plastic films are used, construction can be carried out efficiently and easily.

[Brief explanation of drawings]

FIG. 1 and FIG. 2 are explanatory diagrams showing an example of the method for constructing the radio wave absorber of the present invention. FIGS. 3 and 4 are explanatory diagrams showing an example of a conventional method of constructing a radio wave absorber. FIG. 5 is a diagram showing the relationship between the thickness of the anticorrosive paint, the reflection coefficient, and the reflection loss of a metal structure coated with the anticorrosion coating. DESCRIPTION OF SYMBOLS 1... Radio wave absorbing material, 2... Adhesive, 3... Metal foil, 4... Adhesive layer, 5... Corrosion-resistant plastic film, 6... Paint, 7... Corrosion prevention Painted metal structure. Agent: Patent Attorney Shin Ogawa - Kenshosai Noguchi Kazuhiko Shimo No. 1 Figure 3 Figure 5 Thickness of anti-corrosion paint (μ)

Claims (1)

[Claims] A radio wave absorption device characterized by laminating a metal foil whose both sides are coated with a corrosion-resistant plastic film on the surface of a metal structure coated with anti-corrosion coating, and pasting a radio wave absorbing material on the surface of this metal foil. Body construction method.