JPS6384199A - Manufacture of electromagnetic shielding net - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for producing an electromagnetic shielding net with excellent appearance characteristics, which is used for CRT filters, observation windows of electromagnetic shielding rooms, and the like.

(Prior art and its problems) In recent years, with the advanced development of office automation equipment and other electronic equipment, it has been developed to have an electromagnetic wave shielding effect in order to prevent noise in electronic equipment and prevent the direct influence of electromagnetic waves on the human body.
In addition, transparent electromagnetic wave shielding materials are desired for use in CRT filters for office automation equipment, viewing windows for electromagnetic wave shielding rooms in electronic equipment, and the like.

Conventionally, such transparent electromagnetic wave shielding materials have been used.

■ Porous metal plates such as punched metal; ■ Articles coated with conductive metal oxides or metals on transparent materials by vacuum deposition, etc.; ■ Synthetic silk fabrics kneaded with conductive carbon or conductive synthetic fiber silk fabrics ■ Nets of metal filaments such as stainless steel; ■ Synthetic UHM silk fabric coated with metal by electrolytic plating; (2) and (2) have the disadvantage that a sufficient shielding effect cannot be obtained. ■ and C are not without problems such as being easy to tear and difficult to clean the attached dirt, but they have a sufficiently satisfactory electromagnetic wave shielding effect.
It can be manufactured relatively easily and has practical value due to its economical nature.

However, transparent electromagnetic wave shielding materials are used in work environments where the shielding material must be viewed directly for a long period of time, so materials with metallic luster such as α) and (bow) are used. As a result, light is reflected on the surface of the shielding material, making it difficult to see through the surface and causing great fatigue to the operator.Therefore, it is generally necessary to color the shielding material black to remove its luster.

The method for blackening the electromagnetic shielding net is to (a) electrolytically coat the electromagnetic shielding net with black chromium (b) coat it with a black pigment-dispersed resin paint using a spray method or deep dip method. There are other methods. The above method (a) is difficult to adopt practically because of high production costs and problems in waste liquid treatment, whereas method (b) is common and has been put into practical use in some cases.

However, method (b) also has the following drawbacks.

That is, since the electromagnetic wave shielding net has one extremely fine mesh, if such a net is coated with paint by spraying or dipping, it will cause clogging.
Only a shielding net with poor visibility and poor appearance characteristics can be obtained.

(Object of the invention) An object of the present invention is to provide a method for easily and economically manufacturing an electromagnetic shielding net that has no surface gloss, excellent transparency and appearance characteristics, and has a high electromagnetic shielding effect. shall be.

(Structure of the Invention) The present invention is characterized in that a metal mesh or a metal-plated synthetic fiber mesh fabric having a mesh size corresponding to a Tyler standard sieve of 48 to 325 meshes is electrodeposited in a TL, Z7 paint bath containing a color pigment. Electromagnetic waves with a good appearance characterized by being painted
This is a manufacturing method for g and e.

(9. Effects of light) In the present invention, a metal mesh having metallic luster or a synthetic organ plated with metal is used! Electrodeposition coating T-'4 and the color pigment are coated on the metal surface of the mesh or the silk fabric by dipping the T4 fabric in an electrocoating bath containing the color pigment and electrocoating. In the above electrodeposition coating method, the one mesh or one mesh fabric generally serves as an anode, and the fine particles of the electrodeposition paint and the fine particles of the colored pigment dispersed in the electrocoating bath serve as the anode and the cathode. is negatively charged by applying a DC voltage to the electrode, migrates toward the anode according to the principle of electrophoresis, and is deposited on the anode, the mesh or the tissue,
Coat the metal surface of the chain net or the silk fabric. When the colored pigment is a non-chargeable substance, the metallic surface of the chain network or the silk fabric can be coated in the same manner as above by incorporating the colored pigment into the electrodeposition paint in advance.

The chain network or the #1 fabric coated with the electrodeposition paint and colored pigment is then removed from the electrodeposition bath and the coating is cured. In this way, a colored electromagnetic shielding net whose metal surface is coated with electrodeposition paint and colored pigment and whose metal surface is not exposed is manufactured.

The electromagnetic shielding net 1 manufactured in this way is prepared as described above! Because it is crushed, electrocoating paints and colored pigments can be used in a l! Since it coats only the metal surface of the filament or thread that makes up the woven fabric, it does not destroy one mesh or gap of the 1111 or the silk fabric, and also covers the entire surface of the metal. Since it is uniformly coated, it has excellent transparency and has extremely good appearance characteristics.

In addition, its electromagnetic wave shielding effect is excellent as mentioned above, and the metal surface does not rust or corrode even after long-term use, so it can maintain its electromagnetic wave shielding performance and can be viewed directly for a long time. It is an excellent electromagnetic wave M shielding net with little fatigue.

The present invention is a method that can easily manufacture such an extremely excellent electromagnetic shielding network.

(Preferred implementation of the invention ff5) The metal 1 mesh used in the present invention is made from metal filaments such as stainless steel, aluminum, copper, brass, gold, silver 1 nickel, etc.

This corresponds to a tile mark or sieve of 48 to 325 mesh, preferably 80 to 150 mesh. The mesh is preferably a metal 1 mesh having an aperture ratio of 10 to 80%, particularly 0 to 60 mm.

Also, metal-plated synthetic H used in the present invention
& fiber mesh fabric, polyester, nylon.

Woven or knitted from monofilament, multifilament yarn, or spun yarn such as vinylon or polyacrylonitrile. It is obtained by plating a silk fabric having a mesh size of 48 to 325 mesh, preferably 80 to 150 mesh, corresponding to a Tyler standard sieve, with a metal such as copper, nickel, cobalt, chromium, silver, or aluminum. Examples of the silk fabric include flat-woven fabrics having a mesh such as lawn, cheesecloth, printing screen, etc., and textured fabrics such as rug and gauze. The monofilament, multifilament yarn or spun yarn used has a mesh size as described above, and preferably has an open area ratio of 10 to 80%.
, in particular, can be appropriately selected so as to obtain a silk fabric having a content of 10 to 60%. As a method for metal plating the synthetic #a fiber mesh fabric as described above, there is no method known per se.
Electrolytic plating (chemical plating), vacuum evaporation, or a combination of these and electrolytic plating can be used. The plating layer may be formed to the extent that the surface of the silk fabric becomes conductive to the molecules but does not cause clogging.The plating layer may be a single metal layer or may be formed of multiple types of metal. In the case of a layer of multiple types of metals, for example, a plated layer is first formed by electroless plating, and then another metal is electrolytically plated on the plated layer. It can be formed by

If the size of the metal mesh or the metal-plated synthetic m-fiber mesh fabric is larger than the above range, the electromagnetic wave shielding properties will be lowered, and if it is smaller than the above range, the light transmittance will be lowered, which is not preferable.

In the present invention, the fully bent mesh or metal-plated synthetic visceral mesh fabric obtained as described above is electrodeposited.

In the electrodeposition coating method, the above net or silk fabric is used as one electrode (usually used as an anode, but depending on the type of electrodeposition paint, it may also be used as a cathode), and at least the colored pigment and the electrodeposition paint are applied. A method is employed in which the net or the silk fabric is electrodeposited (coated) with a coloring pigment and an electrodeposition paint in an electrodeposition bath containing the following.

As the electrodeposition paint, any conventionally known material can be used. For example, ■ those whose main skeleton is α, β-ethylenically unsaturated dibasic acids of drying oils, such as maleic acid, or their anhydride adducts, ■ epoxy resins, styrene-
Those whose main skeleton is drying oil fatty acid ester of resinous polyols such as allyl alcohol copolymers; ■ Those whose main skeleton is high acid value alkyd resin; ■ Those whose main skeleton is carboxyl group-containing acrylic resin; It is possible to use modified versions of the same.

These paints are usually used in the form of aqueous solutions of organic amine compounds such as diethylamine, triethylamine, triethanolamine, etc. or solutions of mixtures of wood and lower alcohols.

As the coloring pigment, ordinary water-dispersible inorganic or organic pigments can be used. In the present invention,
Dyed dyes 1 can also be used, and in the specification, dyes are also included in the expression "coloring pigments". The above-mentioned colored pigment can be used by being dispersed in an electrodeposition bath together with the above-mentioned electrodeposition paint. However, if the coloring pigment itself is a non-chargeable substance and does not exhibit electrophoretic properties, it can be used in advance in the electrodeposition paint. A colored pigment is contained in the net or silk fabric so that the colored pigment is coated on the net or silk fabric together with the electrodeposition paint. 1. The color of the colored pigment is generally black (for example, containing carbon black) and is preferable. It may be any other color. Further, the coating amount of the electrocoating paint and the coloring pigment may be such that the metallic luster of the net or silk fabric disappears, and there is no need for excessive coating, and those skilled in the art can easily adjust the coating amount as appropriate.

The electrocoated net or silk fabric is removed from the electrocoat bath and washed, preferably using pure water (ion-exchanged water),
After draining, dry at 50-100°C to remove moisture, then at a temperature in the range of 110-200°C.
The electrodeposited paint film is then cured by baking at a temperature that does not deform the mesh or silk fabric. In this way, it is possible to manufacture a colored electromagnetic shielding network 1 in which the metal surface is coated with an electrodeposition paint and a colored pigment, and the metal surface is not exposed.

Next, examples will be shown.

Example 1 A 150-mesh Tyler standard sieve is given a Japanese name. The fiber surface of a polyester fiber gauze having a mesh was nickel plated by an electroless nickel plating method using hypophosphite as a reducing agent.

83.5% by weight of ion-exchanged water and acrylic-melamine type anion electrodeposition coating $1 (Aron 540 manufactured by Toagosei Chemical Industry ■)
90) Triethylamine was added to the mixture with 16.5% by weight to adjust the pH to 7.7 to 7.9, and further water dispersion was carried out to give a pigment C degree of 0.3% by weight of the mixture. A type black pigment (manufactured by Inuhiseika Kogyo Oki) was added and mixed, and then passed through an 18 L filter to obtain an electrodeposition solution.

The above electrodeposition solution is placed in an electrodeposition bath made of vinyl chloride resin to form an electrodeposition coating bath, the temperature of the bath solution is maintained at approximately 25°C, a stainless steel mensch is used as a cathode, and it is installed in a stainless steel frame. Using the nickel-plated polyester fiber edge as an anode, the polyester fiber edge was electrocoated by applying a DC voltage of about 100 V for about 60 seconds.

The electrodeposition-coated polyester fiber edge was taken out of the electrodeposition bath, washed upward with ion-exchanged water, and then blown with clean compressed air to remove the adhering moisture, followed by hot air circulation maintained at about 80°C. It was placed in a dry explosion machine for 20 minutes to completely evaporate the moisture, and then placed in a hot air circulation dry smoke machine maintained at about 130°C for 1 hour to bake the electrodeposition paint. A black electromagnetic wave shielding net was obtained.

This electromagnetic wave shielding net has no gloss, has no clogging, has excellent transparency, is uniformly coated, has good appearance characteristics, has excellent magnetic wave shielding performance, and has practical strength. It was seven minutes.

Claims (1)

[Claims] (1) Appearance characterized by electrocoating a metal mesh or metal-plated synthetic fiber mesh fabric having a mesh size corresponding to a Tyler standard sieve of 48 to 325 mesh in an electrocoating bath containing a coloring pigment. A method for manufacturing a good electromagnetic shielding net.