JPH0311504A - Metal-coated unwoven cloth and its manufacture - Google Patents

Abstract

PURPOSE:To obtain a metal-coated unwoven cloth to be used as an electromagnetic wave shielding material and an antistatic material by coating organic fibers with silver or copper to be made unwoven cloth followed by coating with a resin coating material. CONSTITUTION:Organic fibers consisting of acryl fibers, polyamid fibers, polyester fibers, polypropylene fibers and rayon is coated with silver and copper by an electroless plating method. Using these fiber, unwoven cloth with a fiber mesh 50g is formed to be coated with a resin coating material. A conductive material excellent all in conductivity, tensil strength, anti-sulfufization, anti- moisture and flexibility can be obtained.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a fibrous body having intoxicating properties, and has been traditionally used as a metal-coated nonwoven fabric and its surface used as an electromagnetic wave shielding material, an antistatic material, etc. Regarding the manufacturing method.

(Prior art and its problems) Conventionally, as shown in, for example, Japanese Unexamined Patent Publication No. 63-262900, it has been proposed to use organic fibers as nonwoven fabrics coated with nickel or copper for electromagnetic shielding materials, etc. However, since nickel has poor conductivity, the shielding effect was not sufficient, and copper was easily oxidized. Therefore, their initial performance could not be maintained, and both lacked reliability and their use was limited. It is also possible to use double layers of silver, but although silver has excellent oxidizing properties, discoloration in a sulfur atmosphere poses a problem.

Coated copper sulfide is also used for antistatic purposes, but it cannot be used for electromagnetic shielding because of its poor conductivity.

The use of metal fibers themselves as woven or non-woven fabrics has also been considered, but stainless steel and nickel have poor conductivity, and copper is easily oxidized. , since the processing is far apart, there is almost no need for processing.

(Purpose of the Invention) In view of the above 1) 11, the inventors of the present invention have decided to study a sterilizing material that has four electric properties, excellent environmental stability, and has a wide application range of 116χ.
``As a result of the research, we found that 9 organic materials were used, 4 materials of copper or 4 materials were used, and 14 high-performance fibrous materials were added to the non-woven fabric, which solved the problems of the conventional resin department. They found the same speed as the present invention.

(Structure of the Invention) That is, according to the present invention, (1) From a non-woven fabric made of metal made of a plate frame with a densely packed plate and a wood cover covered with the non-woven fabric, 12) A method for making a metal-coated non-woven fabric, which is characterized in that organic fibers are coated with a metal to form a non-woven fabric, and then a de-invincible fabric is coated with a resin material. is long.

Generally speaking, organic fibers are natural and synthetic organic fibers.
υ cotton, hemp, regenerated cellulose, polyamide, acrylic,
These are fibers of polyolefin, polyester, etc.

The thickness of the 4-8 fibers is 0.1 to 15 d (d-denier)
If it is thinner than O,xd, a large amount of metal is required to be coated and the specific gravity becomes large.If it is thicker than 1sd, the amount of metal coverage can be reduced, but the fiber becomes hard and opening becomes difficult.

The metal to be coated is silver or copper, and other metals have advantages in terms of conductivity, cost, etc.

The method for metal plating is thermal electrolytic plating, and intermediate methods include vacuum evaporation and the like, but ML-free plating is superior in mass productivity.

The metal covering is 5 to 50 degrees thick, and if it is less than 5 degrees, it will not be able to cover the fiber light and the arousal performance will be poor, and if it is more than 500 degrees, the ratio will be large. As a result, the conductivity also reaches a plateau.

Any method such as dipping, spraying, coating, etc. can be used to coat the resin, but what about the rutted surface? Evenly chewed, strong #? The immersion method is desirable in order to increase the It was confirmed that coating with resin paint eliminates oxidation and discoloration of the metal, strengthens the bonding force of the tightening cord j opening 1, and provides a nonwoven fabric with excellent conductivity and visual stability, and a wide range of applications.

Examples of the resin paints used include room temperature curing types such as epoxy resin paints, acrylic resin paints, polyester resin paints, polyurethane resin paints, and phenol resin paints. The coating amount of the resin paint is 5 to 60% by weight, and if it is less than 5% by weight, it is difficult to coat uniformly, and if it is more than 60% by weight, there will be no flexibility.

When processing into non-woven fabrics, is it only metal-coated organic fibers? However, depending on the required conductivity and other physical properties,
It is also possible to mix it with organic fibers of the same or different types to form a nonwoven fabric. In this case, r=species or heterologous organic #
The mixing ratio of fibers is 99.8% by weight or less; if it exceeds 99.8% by weight, the conductivity becomes dull and the antistatic effect may be lost.

The form of the nonwoven fabric may be a single piece of nonwoven fabric containing metal-coated organic fibers, or it may be multilayered with other organic fiber nonwoven fabrics or pre-dyed organic fiber nonwoven fabrics to impart other physical properties or design properties. is also possible.

Examples of general purpose coatings include electrode materials used for measuring electrocardiograms and brain waves, etc., which take safety into account, electromagnetic shielding materials for filters and heat dissipating parts of housings that are breathable, etc.
lliJ flexible 'fL line electromagnetic shielding material,
Examples include anti-static bedding materials such as decorative blanket covers and bed covers.

Next, the present invention will be specifically explained using examples, but
The following examples are not intended to limit the scope of the invention.

Example: Organic N1 fibers made of delicate acrylic fibers, polyamide fibers, polyester fibers, polypropylene fibers, rayon, and fibers were coated with silver, copper, etc. by electroless plating. Covered.

For electroless plating, immerse in green shavings, rinse with water, and immerse in an aqueous solution containing stannous chloride lug/L and salt 22 omL/L.
Wash with water, then palladium chloride 1g/L% hydrochloric acid 20mL
After catalyticization was carried out by immersing the sample in an aqueous solution containing %/L, a plating solution having the following composition was used. All metal ions in the plating solution can be reduced and precipitated, so which metal ions should be electrolyzed? I used a plating solution containing Soni.

Table 1 Using these materials, nonwoven fabrics with a fiber basis weight of 50 g as shown in Table 2 were prepared, and in the comparative examples they were left as they were, and in the examples they were coated with resin paint, the tensile strength was measured, and then they were subjected to a sulfurization test and a moisture resistance test. A test was conducted and the surface resistance before and after the test was determined to be 6111. The results are shown in Table 3. In addition, in the sulfurization test, it was immersed in a 10% potassium polysulfide aqueous solution at 25°C for 5 minutes, and in the humidity test, it was left in saturated steam at 70°C for 10 days.

Table 2 (Effects of the Invention) The metal-coated +1 nonwoven fabric of the present invention exhibits the following effects by adopting the above configuration. That is, it is a novel electrically conductive material that has not been seen before and is excellent in tetraconductivity, bud tear strength, l' sulfurization resistance, moisture resistance, flexibility, etc.

Claims (1)

[Scope of Claims] (1) A metal-coated nonwoven fabric characterized by comprising organic fibers, a nonwoven fabric made of a metal coated on the organic fibers, and a resin paint coated on the nonwoven fabric, (2) a metal coated nonwoven fabric made of organic fibers coated with a metal. A method for producing a metal-coated non-woven fabric, comprising: preparing a non-woven fabric, and then coating the non-woven fabric with a resin coating; (3) the organic fiber has a thickness of 0.1 to 15 d; (4) the metal-coated non-woven fabric according to claim 1, wherein the metal is silver or copper; (5) the metal-coated non-woven fabric according to claim 1, wherein the resin coating is room temperature curable. A coated nonwoven fabric, (6) The metal coated nonwoven fabric according to claim 1, wherein the coating amount of the metal is 5 to 50% by weight (metal weight/organic fiber weight after metal coating), (7) The resin coating. The metal-coated nonwoven fabric according to claim 1, wherein the coating amount is 5 to 60% by weight (resin solid content weight/nonwoven fabric weight after coating with resin paint); 99.8% by weight or less of fiber (same or different organic fiber weight/
(9) Production of the metal-coated non-woven fabric according to claim 2, wherein the method for coating the metal is an electroless plating method. Method, (10) 99.8% by weight or less of the same or different organic fibers (same or different organic fiber weight/
The method for producing a metal-coated non-woven fabric according to claim 2, wherein (11) the non-woven fabric is in the form of a single layer of non-woven fabric containing metal-coated organic fibers or with other organic fiber non-woven fabrics. The method for producing a metal-coated nonwoven fabric according to claim 2, which has a multilayer structure of