JPS59135232A - Electroconductive reticular elastomer - Google Patents

Abstract

PURPOSE:An electroconductive and elastic IC part or semiconductor, prepared by forming a film of plated metal on the surface of a plastic skeleton which constitutes a reticular elastomer. CONSTITUTION:An electroconductive reticular elastomer prepared by forming a film of plate metal on the surface of a plastic skeleton which constitutes a reticular elastomer (e.g., one prepared by treating a polyurethane foam with an alkali or by an explosion method to remove the membrane existing in the interstices of the network and to leave the three-dimensional reticular skeleton only. This elastomer can be produced as follows: A metal plating in such a thickness as not to damage the elasticity is formed on the surface of a plastic skeleton which is to constitute a reticular elastomer, or the surface of a plastic skeleton which is to constitute a reticular elastomer is plated with a metal to such an extent that the skeleton loses its elasticity, and then the film of the plated metal is partially broken by intentional compressive deformation to recover the elastic function of the plastic skeleton.

Description

[Detailed Description of the Invention] In recent years, with the development of the electronic industry, there has been a demand for materials with new electrical properties that have never been seen before. For example, iC parts and semiconductor devices.

Conductive packaging materials that prevent damage caused by static electricity during storage and transportation of special KMO8 devices, conductive cushioning materials that absorb all static electricity from the human body during the electronic component manufacturing process, and temperature-sensitive pressure-sensitive switch materials for electronic components themselves.

Electrically conductive elastic bodies are in demand as new materials in the electronics industry. Conventionally, such materials include conductive rubber elastic bodies in which a conductive substance is kneaded into a rubber elastic body, but such conductive rubber elastic bodies require a large force to deform and are heavy. It has the following disadvantages. Furthermore, Japanese Patent Publication No. 57-24371 discloses a method for imparting electrical conductivity to the entire resin coating (1) in which conductive carbon is dispersed in the resin skeleton of an elastic network. The conductivity of an elastic body is 10'Ω in terms of its volume resistivity.
・The mouth is the limit, and in recent years there has been an urgent need to develop materials that absorb and shield electromagnetic waves due to the movement to regulate electromagnetic waves overseas.
It cannot be used in applications such as Soha 5, which requires even higher V/'IS electrical properties.

In other words, in order to provide even higher conductivity, it is necessary to metallize the net-like body, and Japanese Patent Publication No. 47-10524 proposes a method of conducting conductive treatment on the net-like body and plating it with metal. ing. However, the so-called metal foam made by this method is, as its name suggests, made of a metallized network and does not have elasticity.

In view of the situation where the present invention is limited, the volume resistivity is 1 to 10 months.
As a result of intensive studies to create a conductive elastic network with a conductivity of 4 Ωm, the goal was achieved. A conductive reticular elastic body that has both elasticity and elasticity is known as a conductive reticular elastic body. (2) Reticular elastic body number.

After the surface of the plastic skeleton to be formed is plated with metal to the extent that its elasticity is lost, the metal plating film is intentionally compressed and deformed to partially destroy it, thereby recovering the elastic function of the plastic skeleton. I'll save you.

Next, details of the present invention will be explained step by step.

Plastics used in the present invention to form the reticulated elastic body include polyethylene foam with open cells, polyvinyl chloride foam, polyurethane foam, polyimide foam, polybutadiene foam, etc. Preferably, due to its elasticity and uniform network structure, polyurethane foam is treated with a known alkali treatment or explosive method to form a membrane (thin film) existing between three-dimensional networks.
Remove.

The ability to use something that retains only the three-dimensional network skeleton is good.

Also 1. The plating technology used in the present invention may be performed by applying conductive treatment to the surface of the plastic skeleton forming the reticular elastic body. According to this method, it is difficult to provide a uniform thin film on the complex Sakaki structure and body, so it is preferable to use electroless plating technology. .40mm, silver, gold.

Although known plating such as platinum or alloys of these metals may be used, nickel, electroless, and copper plating are preferred from the viewpoint of the conductivity of the resulting product and cost. Electroless plating method and method: A general method as described in the well-known literature was used. □The thickness of the metal film plated on a particular surface may vary depending on the elastic network used and the type of electroless plating used.
Of course, when the three-dimensional polyurethane network is used as a base material, the network generally loses its elasticity after a film thickness of several microns. That is, if the film thickness is greater than fL, the metal film on the surface must be partially destroyed to restore the elasticity of the base material, and for this purpose, it is sufficient to compress and deform it by external force. When this state is observed under a magnifying microscope, it is observed that cracks appear in the plated metal film of the bent plastic skeleton due to compressive deformation.

However, if we look in detail at the bent plastic skeleton, it is thought that the mountain folds of the plastic skeleton are electrically disconnected due to cracks, but no such phenomenon is observed at the valley folds on the opposite side. Things in which current flows without n
I thought, 1. It was also found that in a three-dimensional network, even if a part of the skeleton were electrically disconnected, electricity would still flow through other network routes.

The present invention utilizes the above-mentioned phenomenon to produce conductive reticular elastic plating by combining a conductive metal film and a reticular elastic body.Note that when the thickness of the metal film becomes extremely thick, it will no longer return to its original state due to compressive deformation. It disappears.

A metal-plated mesh body in such a state can be called a metal form in the sense that the elasticity of the base material has already disappeared.It is considered to be distinguished from the conductive mesh elastic body of the present invention and is not within the scope of the present invention. does not include n.

In other words, the conductive reticular elastic body according to the present invention includes a conductive reticular elastic body formed by plating the surface of the skeleton of the reticular elastic body with metal to a thickness that does not impair its elasticity, and a conductive reticular elastic body formed by plating the surface of the skeleton of the reticular elastic body with metal to an extent that the elasticity is lost. The present invention relates to an electrically conductive network elastic body which is intentionally compressed and deformed after m to partially destroy the metal plating film and restore the elasticity of the network.・
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The conductive reticulated elastic body made in this way has a volume resistivity of 1.0.1 to 10' Ω, and has conductivity and properties that cannot be produced using conventional technology, and is suitable for IC. parts.

Semiconductor dinomyce: Conductive packaging material to prevent damage caused by static electricity, especially during storage and transportation of MO/S devices, etc. In the electronic component manufacturing process: Conductive cushion body to absorb static electricity from the human body, or It can be used not only as a material for pressure-sensitive switches, but also as a material for absorbing and shielding electromagnetic waves.

(Example 1) Polyurethane three-dimensional network made by Pridestone Tire Company (
Product name Scotto Form 11R-08) 310x3i
The oxtox-sized sample was treated in the next step using an electroless nickel solution (trade name: Komuden 788) manufactured by Uezai Kogyo ■.

■) Sensitizing (Uezai Kogyo S-1oXto diluted solution) immersed for 3 minutes 2) Washing with water 3) Activation (Uemura Kogyo S-10xlO diluted solution) immersed for 3 minutes 4) Washing with water 5) Repeat once with the same procedure 6 ) Electroless nickel plating (Kamizai Kogyo Nimuden 7゛8S
5 times diluted solution) conditions, solution temperature: 90°C, immersion plating time: 3 minutes, 7) washing with water, 8) washing with hot water, 9) drying.The three-dimensional network formed in step 1 is elastic as it is, and its electrical conductivity is equal to the volume resistance. The ratio was 2.0×10 2 Ω・sub.

(Example 2) Electroless nickel plating was performed for 6 minutes in the same process as above. The resulting sample has no elasticity until it bends, and regains its elasticity through compression deformation, and its electrical conductivity is 1 in terms of volume resistivity.
．． It was 6XlO'Ω·m.

(Example 3) Example 2 Using Scotto Foam HR-30i manufactured by Prideston Tire ■ as the three-dimensional polyurethane network of the base material
Electroless nickel plating was performed for 10 minutes in the same process as above. The resulting sample had no elasticity as it was, and fully recovered its elasticity when compressed and deformed, but the elasticity of the base polycrethane foam overcame the elasticity of the plated metal film and retained some elasticity. The volume resistivity of this product is 2.
OX 10-'Ω·α.

Claims (1)

[Claims] A conductive reticular elastic body that has both conductivity and elasticity and has a metal plating film on the surface of the plastic skeleton that forms the reticular elastic body.