JPH05186966A - Electromagnetic wave-shielding fabric - Google Patents

Abstract

PURPOSE:To obtain the subject fabric, composed of thin fabric containing fiber comprising metal-coated fiber and capable of shielding electromagnetic waves. CONSTITUTION:The objective electromagnetic wave-shielding fabric, capable of shielding electromagnetic waves in a wavelength band at 1kHz to 1THz and useful as protective clothes for working wears is obtained by forming a nonwoven fabric only from metal-coated fiber prepared by coating synthetic fiber with a metal (e.g. silver) according to electroless plating and bonding a flexible vinyl chloride sheet through a vinyl chloride-based adhesive to the formed nonwoven fabric. Furthermore, nonwoven fabric composed of the metal- coated fiber and other fibers (e.g. synthetic fiber or regenerated fiber) is laminated to the flexible vinyl chloride sheet through an adhesive containing soft magnetic alloy powder to provide a laminated fabric having electromagnetic wave- shielding effects.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic wave shielding cloth.

[0002]

2. Description of the Related Art In recent years, so-called OA and FA have been developed in offices and factories, and various electronic devices have been widely used. Some of these electronic devices emit electromagnetic waves although they are weak, and electromagnetic waves with a long wavelength of 10 kHz to 300 GHz may adversely affect the human body. "Radioprotection guidelines" (Declaration by the Telecommunications Technology Council, Advisory No. 38, "Human body protection guidelines for radio wave use", June 1990) show protection methods for reducing the intensity of electromagnetic fields radiated to the human body. As described above, since the electronic device is generally manufactured and used in consideration of the influence on the human body, the irradiation amount on the human body is not large.

However, it is desirable to further reduce the amount of irradiation to the human body when continuing to work near electronic equipment which emits electromagnetic waves continuously for a long time every day. For this reason, work protection garments having good workability and low cost against electromagnetic waves have been demanded.

[0004]

SUMMARY OF THE INVENTION In order to solve the above problems, it is an object of the present invention to provide an electromagnetic wave shield cloth as a cloth for working protective clothing.

[0005]

In the present invention, an electromagnetic wave shielding fabric is constructed by laminating a thin cloth made of a fiber containing a metal-coated fiber by itself or by laminating it. Further, an electromagnetic wave shielding fabric was constructed by laminating and laminating a thin cloth with an adhesive containing a soft magnetic alloy powder. A coating material containing a soft magnetic alloy powder was applied to construct an electromagnetic wave shield fabric. Furthermore,
A thin cloth made of fibers containing metal-coated fibers, an adhesive containing soft magnetic alloy powder, and a coating containing soft magnetic alloy powder were used in combination with 2 or 3 to form an electromagnetic wave shielding cloth.

[0006]

The thin cloth itself, the adhesive for adhering the thin cloth to each other, and the coating material applied to the thin cloth, or two or more of them are 1 kHz to 1
Shields electromagnetic waves in the THz wavelength band.

[0007]

【Example】

Example 1. Acrylic fiber (1.5d × 38mm) was dipped in a scouring agent and washed with water, then stannous chloride 10g / L, hydrochloric acid 2
After immersion in an aqueous solution containing 0 mL / L and washing with water to impart catalytic properties to electroless silver plating, silver was coated on the fibers with a predetermined amount of a plating solution having the following composition. The coating amount is 10% by weight of silver based on the acrylic fiber. Since all silver ions in the plating solution are reduced and deposited, the ratio of silver to fibers can be accurately defined. The composition of the plating solution is as follows. Ethylenediaminetetraacetic acid tetrasodium 200g / 2L sodium hydroxide 50g / 2L formalin 100mL / 2L When an ammoniacal silver nitrate solution having the following composition is added dropwise thereto at 25 ° C, silver is electrolessly deposited on the acrylic fiber surface. Silver nitrate 31.6g / L Ammonia water 100mLg / 2L

After the fibers coated with silver were dried, a non-woven fabric having a weight of 80 g / m ² was formed from the fibers alone, and the non-woven fabric was bonded to a soft vinyl chloride sheet with a vinyl chloride adhesive to obtain a laminated fabric. When an electromagnetic wave shield protective garment was tailored with this laminated fabric, the garment had good workability.

Further, this laminated fabric has a frequency of 1 kHz to 1 THz.
The electromagnetic wave shielding effect is measured in the wavelength band of and the dB value is 74
dB was obtained, and a large electromagnetic wave shielding effect was revealed. The measurement was performed by the Advantest method. That is, the sample was placed between the transmitting probe antenna and the receiving probe antenna in the shield box, and the attenuation rate (dB) was calculated from the intensity ratio of the transmitted electromagnetic wave and the received electromagnetic wave. The frequency of measurement was measured by continuously changing it between 1 kHz and 1 THz. The values described in this embodiment and the following embodiments are 1 kHz, 1 MHz, 1 G
It is the average value of the attenuation rate (dB) at 4 points of Hz and 1 THz.

In addition to the measurement in the initial state, it was also measured after the temperature and humidity test and after the washing test. The temperature-humidity test was carried out by leaving it at 100 ° C. in 95% relative humidity at 80 ° C. for 100 hours, but there was almost no change at 75 dB. The washing test consists of a standard fully automatic washing machine with standard washing and drying in a dryer.
There was no more than 10 percent reduction in dB value with the repeated method.

Embodiment 2. The description of the same or similar points as in the first embodiment will be omitted. 80 g / m of silver-coated acrylic fiber (1.5 d × 38 mm) obtained in the same manner as in Example 1
² and polyester fiber were made into a nonwoven fabric at a rate of 50 g / m ² . A protective coating was formed on both sides of this non-woven fabric with a vinyl paint. In addition, the electromagnetic wave shielding effect of this cloth was measured, and a dB value of 58 dB was obtained in the initial state, and there was almost no change at 56 dB after the temperature and humidity test, and a dB value of 1 after the washing test.
There was no more than 0 percent reduction.

Example 3. 3 pieces of aramid fibers coated with silver (2d × 51 mm) obtained by the same method as in Example 1 were used.
The 0 g / m ² and aramid fibers was non-woven fabric at a rate of 20 g / m ^2. This non-woven fabric was adhered to a rayon cloth with a vinyl acetate adhesive to obtain a laminated cloth. In addition, the electromagnetic shielding effect of this laminated fabric was measured, and the dB value in the initial state was 8
3 dB was obtained, unchanged at 83 dB after the temperature and humidity test and no more than 10 percent reduction in dB value after the wash test.

Example 4. A silver-coated aramid fiber (2d × 51 mm) obtained by the same method as in Example 1 was used.
The 0 g / m ² and rayon fiber was nonwovens at a rate of 40 g / m ^2. This nonwoven fabric was adhered to a soft vinyl chloride sheet with a vinyl chloride adhesive to obtain a laminated fabric. The electromagnetic wave shielding effect of this laminated fabric was measured, and a dB value of 51 dB was obtained in the initial state, and 53 dB after the temperature and humidity test.
There was almost no change, and there was no more than 10% decrease in the dB value after the washing test.

Example 5. Soft magnetic alloy powder Fe-Al-S
i was mixed with a vinyl chloride-based adhesive in an amount of 500% with respect to the amount of the resin, applied on a soft vinyl chloride sheet, and laminated on another soft vinyl chloride sheet to obtain a laminated fabric. The amount of the soft magnetic alloy mixed with the adhesive or paint is given by the ratio of the amount of alloy to the amount of resin Px = alloy amount (kg) / resin amount (kg). If this value is too large, the adhesiveness will decrease, but Px =
In the range up to 10, there is no decrease in adhesion. In addition, the electromagnetic wave shielding effect of this laminated fabric was measured, and the initial state was dB.
A value of 67 dB was obtained, there was little change at 65 dB after the temperature and humidity test, and there was no more than a 10% decrease in dB value after the wash test.

Example 6. Soft magnetic alloy powder permalloy 22
% Fe-78% Ni was mixed with a vinyl chloride adhesive in an amount of 200% with respect to the amount of resin, applied on a soft vinyl chloride sheet, and laminated on a rayon cloth to obtain a laminated cloth. Further, the electromagnetic wave shielding effect of this laminated fabric was measured, and a dB value of 59 dB was obtained in the initial state, there was almost no change at 59 dB after the temperature and humidity test, and there was no decrease in the dB value of more than 10% after the washing test.

Example 7. A non-woven fabric was formed using only the silver-coated fibers obtained in the same manner as in Example 1. This non-woven fabric was laminated on a soft vinyl chloride sheet with a vinyl chloride adhesive mixed with amorphous soft magnetic alloy powder Fe-Al-Si formed in the same manner as in Example 5 to obtain a laminated fabric. Also, the electromagnetic wave shielding effect of this laminated fabric was measured, and a dB value of 86 dB was obtained in the initial state. There was almost no change at 85 dB after the temperature and humidity test, and a dB value of 1 after the washing test.
There was no more than 0 percent reduction.

Example 8. Soft magnetic alloy powder permalloy 22
% Fe-78% Ni mixed with vinyl acetate paint,
It was applied to both sides of rayon cloth. Also, the electromagnetic wave shielding effect of this protective rayon fabric was measured, and a dB value of 63 dB was obtained in the initial state, there was almost no change at 64 dB after the temperature and humidity test, and there was no decrease in the dB value after the washing test of more than 10%.

Results of measuring the electromagnetic wave shielding effect depending on the fiber composition of the non-woven fabrics in Examples 1 to 7 and Comparative Examples 1 to 3 and the kind of soft magnetic alloy powder mixed with the adhesive in the initial state, after the temperature and humidity test and after the washing test Is as listed below.

Electromagnetic wave shielding effect Temperature Soft magnetic initial humidity Washing Silver coated fiber Other fibers Alloy powder state test test Example 1 silver 10% coating −−−− 74 dB 75 dB 〇 acrylic fiber 80 g / m ² Example 2 silver 10% coated polyester --74 dB 75 dB Acrylic fiber 50 g / m ² 50 g / m ² Example 3 30% silver coated aramid --58 dB 56 dB Aramid fiber 30 g / m ² 20 g / m ² Example 4 Silver 30% coated rayon --83 dB 83 dB ○ Aramid fiber 10g / m ² 40g / m ² Example 5 --- --- Fe-Al-Si 67dB 65dB Example 6 --- --- Fe-Ni 59dB 59dB Example 7 Silver 10% coating --- Fe- Si-B 86dB 85dB Acrylic fiber 80g / m ² Example 8 --- --- Fe-Ni 63dB 64dB 〇 Comparative example 1 Aluminum foil electromagnetic wave shield material 67dB 36dB − Comparative example 2 Electromagnetic wave shield material copper foil 97dB 41dB − Comparative example 3 Electromagnetic wave shield material Iron foil 79dB 32dB-The result of the washing test shows that the dB value is higher than the initial value. When the percentage is 10% or less, the mark is ◯, and when the percentage is 10% or more, −
It is represented by a mark.

[0020]

EFFECTS OF THE INVENTION According to the present invention, an electromagnetic wave shield cloth for work protective clothing which shields electromagnetic waves in the wavelength band of 1 kHz to 1 THz is obtained.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI Technical display location D06M 17/00 7199-3B 23/08 H01B 1/22 B 7244-5G 7199-3B D06M 21/00 Z

Claims (9)

[Claims] 1. An electromagnetic wave shielding fabric, which is a thin fabric made of a fiber containing a metal-coated fiber. 2. An electromagnetic wave shielding cloth, which is a thin cloth made of fibers containing metal-coated fibers, the surface of the thin cloth being protected by an organic coating. 3. An electromagnetic wave shielding cloth, which is formed by laminating thin cloths, and at least one of the thin cloths is a thin cloth made of fibers containing metal-coated fibers. 4. The metal-coated fiber is a fiber coated with silver by electroless plating.
A few electromagnetic shield fabrics. 5. An electromagnetic wave shielding fabric, characterized in that a thin cloth is laminated, the thin cloth is adhered by an adhesive, and at least 1 of the adhesive contains a soft magnetic alloy powder. 6. The soft magnetic alloy powder is Fe-Si-B, Fe.
The electromagnetic wave shielding fabric according to claim 5, which is powder of one or more amorphous alloys selected from -Al-Si and Fe-Ni. 7. A thin cloth laminated, at least one of which is a fiber containing metal-coated fibers, the thin cloth being adhered by an adhesive, An electromagnetic wave shielding cloth characterized in that at least 1 contains a soft magnetic alloy powder. 8. The thin cloth made of the fiber containing the metal-coated fiber is a non-woven fabric.
4,7 electromagnetic shield fabric. 9. An electromagnetic wave shield cloth, which is obtained by applying a paint containing a soft magnetic alloy powder to a thin cloth.