JP4355892B2 - Manufacturing method of electromagnetic shielding material - Google Patents

Description

【００３６】
表１から、本発明の加工処理を施すことにより、導電性繊維の銀メッキが剥離しないので、電磁波シールド性能の生地の耐久性が向上することが分かる。
【００３７】
【発明の効果】
本発明により、導電性繊維における付着した銀の汗による化学的劣化、又は洗濯などの物理的劣化を抑制し、導電性繊維の耐久性を向上させることができる。
【００３８】
本発明の方法により、着用による不快感がなく、繰り返し着用及び洗濯しても、その電磁波シールド性能を維持できる衣料用素材を提供することができる。
【図面の簡単な説明】
【図１】 実施例２において、着用前の導電性生地部分表面の走査型顕微鏡写真のコピーである。
【図２】 実施例２において、着用５０回後の導電性生地部分表面の走査型顕微鏡写真のコピーである。
【図３】 比較例１において、着用前の導電性生地部分表面の走査型顕微鏡写真のコピーである。
【図４】 比較例１において、着用５０回後の導電性生地部分表面の走査型顕微鏡写真のコピーである。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for preventing deterioration of conductive fibers such as an electromagnetic shielding material and electromagnetic shielding clothing. The present invention also relates to a garment in which deterioration of conductivity is suppressed.
[0002]
[Prior art]
Conventionally, there is an electromagnetic wave shield by clothing as a countermeasure for protecting the human body from electromagnetic interference. Fabrics in which conductive fibers or chemical fibers are knitted or woven have been proposed (see Patent Document 1). Alternatively, there has been proposed a fabric using a composite yarn in which a conductive fiber is used as a core yarn and a non-conductive fiber is covered with the core yarn (see Patent Document 2).
[0003]
However, when these clothes are repeatedly worn and washed, there is a problem that the electromagnetic wave shielding performance is lowered.
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 10-77507 [0005]
[Patent Document 2]
Japanese Patent Laid-Open No. 11-50352 [0006]
[Problems to be solved by the invention]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a clothing material that can maintain its electromagnetic shielding performance even when repeatedly worn and washed without causing discomfort due to wearing. It is to be.
[0007]
[Means for Solving the Problems]
In the present invention, by conducting at least two processing treatments selected from the group consisting of rust prevention processing, resin processing, and water repellent processing on conductive fibers to which silver is adhered, chemical degradation due to sweat of the fibers or It has been found that an electromagnetic wave shielding material that suppresses physical deterioration due to washing or the like and has excellent durability can be provided.
[0008]
That is, this invention relates to the manufacturing method of the following electromagnetic shielding materials, the electromagnetic shielding material obtained by this method, the clothing made from this electromagnetic shielding material, and the deterioration prevention method of the conductive fiber for electromagnetic shielding materials.
Item 1. In a fabric knitted with conductive fibers alone or with other fibers with silver attached,
(Treatment 1) Rust prevention treatment with a chelating agent capable of forming a chelate complex with silver,
(Process 2) Resin processing with polyamide resin or silicon-based resin, and (Process 3) Water-repellent processing with fluorine-based water-repellent resin,
The manufacturing method of the electromagnetic wave shielding material which performs these 3 processes or processes 2 processes 1 and 3 .
Item 2. The manufacturing method of Claim 1 which performs water-repellent processing after a rust prevention processing.
Item 3. The manufacturing method of Claim 1 which performs resin processing and water-repellent processing in the same bath after rust prevention processing.
Item 4. The manufacturing method according to any one of claims 1 to 3, wherein the conductive fiber deposits silver by sputtering, vacuum deposition, or electroless plating.
Item 5. The electromagnetic wave shielding material manufactured by the manufacturing method in any one of Claims 1-4.
Item 6. A clothing made of the electromagnetic shielding material according to claim 5.
Item 7. In a fabric knitted with conductive fibers alone or with other fibers with silver attached,
(Treatment 1) Rust prevention treatment with a chelating agent capable of forming a chelate complex with silver,
(Process 2) Resin processing with polyamide resin or silicon-based resin, and (Process 3) Water-repellent processing with fluorine-based water-repellent resin,
The method for preventing deterioration of conductive fibers for electromagnetic wave shielding materials, wherein the three treatments are performed, or the two treatments of treatment 1 and treatment 3 are carried out.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The present invention is a fabric in which conductive fibers having silver attached thereto are knitted alone or knitted with other fibers such as synthetic fibers (polyester, nylon, acrylic, polypropylene, etc.) or natural fibers (wool, cotton, etc.). In addition, by conducting at least two processing selected from the group consisting of rust prevention processing, resin processing and water repellent processing, the conductive fibers which suppress deterioration of the conductive fibers and improve the durability of the electromagnetic wave shielding effect It relates to the degradation prevention law.
[0010]
The rust prevention process in the present invention is preferably a process of chelating silver. The rust-proofing treatment can be performed by a conventional method such as a dipping method, a spray method, or a coating method. The rust preventive agent may be a rust preventive agent used for silver rust prevention treatment, and preferably contains a chelate agent capable of forming a chelate complex with silver and, if necessary, a chelate auxiliary. As an example of the rust preventive agent, New Dyne Silver manufactured by Daiwa Kasei is listed. The antirust processing temperature is not particularly limited. Further, the antirust processing time is not limited. The concentration of the treatment liquid for the rust prevention treatment is preferably 5 to 20% by weight. As the solvent for the treatment liquid, a water-soluble solvent such as tetrahydrofuran, methanol or ethanol, water, a mixed solution thereof or the like is used.
[0011]
The resin used in the resin processing in the present invention is a resin that can be usually used, and examples thereof include polyamide resin, polypropylene resin, silicon resin, urethane resin, acrylic resin, thermosetting resin (phenol resin, melamine resin, etc.) and the like. Of these, polyamide resins and silicon resins are preferable. The resin can be spray coated or padded on the fabric and dried or heat treated to crosslink the resin and improve the adhesion between the fabric and the resin. At this time, the concentration of the resin in the processing liquid is preferably 7% or less, more preferably 4 to 6%. It is preferable that the resin concentration in the processing liquid is 7% or less because the flexibility of the dough is high. Further, the processing liquid may contain a crosslinking agent or the like. As a solvent for the working liquid, a water-soluble solvent such as tetrahydrofuran, methanol, ethanol, water, a mixed solution thereof or the like is used.
[0012]
In the water-repellent processing method in the present invention, a fluorine-based water-repellent resin is applied to the fabric by a method such as padding, coating method, spray method or dipping method, and then dried by an appropriate means such as a pin tenter. Examples of fluorine-based water-repellent resins include various organic resins containing fluorine. Particularly, acrylic acid esters, methacrylic acid esters, alkyl acrylamides, alkyl vinyl ethers, vinyl alkyl ketones and the like containing fluoroalkyl groups. Examples thereof include polymers of unsaturated monomers and copolymers thereof.
[0013]
As a solvent for the water-repellent processing solution, a water-soluble solvent such as tetrahydrofuran, methanol, ethanol, water, a mixed solution thereof or the like is used. The resin concentration in the working fluid is 2 to 10% by weight, preferably 4 to 6% by weight. Depending on the type of fabric to be water repellent, the treatment temperature is 150 ° C. to 190 ° C., preferably 160 ° C. to 180 ° C., and the treatment time is preferably about 1 minute to about 3 minutes.
[0014]
The rust preventive process, resin process and water repellent process of the present invention are performed in combination of at least two, and preferably all three processes are performed. When all three processes are performed, it is preferable to start the rust prevention process first, more preferably in the order of the rust prevention process, the resin process, and the water repellent process. You may go at the same time. Further, for example, when a resin having both properties of resin processing and water repellent processing is used, either resin processing or water repellent processing may be performed.
[0015]
The fibers used for the conductive fibers of the present invention are synthetic fibers such as polyamide, polyester, acrylic and polypropylene, natural fibers such as cotton, silk and hemp, or blended fibers thereof, preferably polyester.
[0016]
The conductive fiber of the present invention can be obtained by adhering silver to the fiber by sputtering, vacuum deposition, electroless plating or the like.
[0017]
The conductive fibers of the present invention are knitted alone or with other fibers. Examples of the knitted structure include weft knitting such as single cord knitting, flat knitting, rubber knitting, and pearl knitting, and warp knitting such as denby knitting, cord knitting, and atlas knitting, and preferably weft knitting.
[0018]
The clothing made from the fabric treated by the method of the present invention can be used as clothing such as underwear that is repeatedly washed and directly touches the skin.
[0019]
【Example】
In the following examples, the electromagnetic shielding performance of the fabric was measured as follows.
[0020]
In a shield box (MB8602B; manufactured by Anritsu) with a transmitting antenna and a receiving antenna installed in a short distance, the material to be measured is sandwiched between the antennas, and the attenuation state at 800 MHz, which is one frequency band of a mobile phone. Measured with a spectrum analyzer (TR4173; manufactured by Advantest). Further, the attenuation state was measured in the same manner as described above without sandwiching the material, and the difference (dB) was evaluated as the electromagnetic wave shielding performance of the material.
[0021]
Example 1
Soaked in 10% aqueous solution of rust inhibitor (Daiwa Kasei New Dyne Silver) in a weft knitted fabric made of polyester with conductive fibers (Mitsubishi Materials Sil Fiber) and polyester multifilament silver-plated Next, the resin was processed by padding using a 4% methanol solution of CM4000 manufactured by Toray. Further, a 7% aqueous solution of FR-448 manufactured by Kyoeisha Chemical was used to perform a water repellent treatment by padding at 180 ° C. for 1 minute.
[0022]
An undergarment was made using the electromagnetic shielding fabric thus obtained in the front. By the above method, the electromagnetic shielding property of the conductive fabric portion of the underwear was measured. There was no discomfort while wearing the underwear.
[0023]
The underwear was worn and washed 50 times, and the electromagnetic shielding property of the conductive fabric portion was measured by the above method every time 10 times.
[0024]
The results are shown in Table 1.
[0025]
Example 2
A rust preventive (Daiwa Kasei New Dyne Silver) is dipped into the same fabric as in Example 1, and then padded for resin processing (6% aqueous solution of TF-3800 made by Kitahiro Chemical) and water repellent finishing ( Kyoeisha Chemical FR-448 5% aqueous solution) was subjected to the same bath treatment.
[0026]
An undergarment was made using the electromagnetic shielding fabric thus obtained in the front. The surface of the conductive fabric portion of the underwear was observed using a scanning microscope (FIG. 1). Further, the electromagnetic shielding performance of the conductive fabric portion was measured by the above method. There was no discomfort while wearing the underwear.
[0027]
Every time the underwear was worn and washed 10 times, the electromagnetic shielding performance of the conductive fabric part was measured as described above, and after 50 times, the surface of the fabric was observed using a scanning microscope ( Figure 2). Table 1 shows the measurement results of electromagnetic shielding performance.
[0028]
Example 3
The same fabric as in Example 1 was dipped in a 10% aqueous solution of a rust inhibitor (New Dyne Silver manufactured by Daiwa Kasei) and padded at 180 ° C. for 1 minute using a 5% aqueous solution of FR-448 manufactured by Kyoeisha Chemical. The water-repellent finish was applied.
[0029]
An undergarment was made using the electromagnetic shielding fabric thus obtained in the front. The electromagnetic shielding performance of the conductive fabric portion of the undergarment was measured by the above method. There was no discomfort while wearing the underwear.
[0030]
Every time the underwear was worn and washed 10 times, the electromagnetic shielding performance of the conductive fabric portion was measured as described above. Table 1 shows the measurement results of electromagnetic shielding performance.
[0031]
Comparative Example 1
The same procedure as in Example 2 was performed except that no processing was performed.
[0032]
3 and 4 show the results of the surface observation of the conductive cloth portion of the obtained underwear, and Table 1 shows the measurement results of the electromagnetic shielding performance of the conductive cloth portion. There was no discomfort while wearing the underwear.
[0033]
Comparative Example 2
The same fabric as in Example 1 was padded with a 10% aqueous solution of a rust inhibitor (New Dyne Silver manufactured by Daiwa Kasei).
[0034]
Table 1 shows the measurement results of the electromagnetic shielding performance of the underwear obtained in the same manner as in Comparative Example 1. There was no discomfort while wearing the underwear.
[0035]
[Table 1]

[0036]
From Table 1, it can be seen that, by applying the processing of the present invention, the silver plating of the conductive fibers does not peel off, so that the durability of the cloth for electromagnetic wave shielding performance is improved.
[0037]
【The invention's effect】
According to the present invention, chemical deterioration due to silver sweat adhering to conductive fibers or physical deterioration such as washing can be suppressed, and the durability of the conductive fibers can be improved.
[0038]
According to the method of the present invention, it is possible to provide a garment material that is free from discomfort due to wearing and can maintain its electromagnetic shielding performance even when repeatedly worn and washed.
[Brief description of the drawings]
FIG. 1 is a copy of a scanning photomicrograph of the surface of a conductive fabric portion before wearing in Example 2.
FIG. 2 is a copy of a scanning photomicrograph of the surface of a conductive fabric portion after wearing 50 times in Example 2.
FIG. 3 is a copy of a scanning photomicrograph of the surface of the conductive fabric portion before wearing in Comparative Example 1;
FIG. 4 is a copy of a scanning photomicrograph of the surface of the conductive fabric portion after wearing 50 times in Comparative Example 1.

Claims (7)

In a fabric knitted with conductive fibers alone or with other fibers with silver attached,
(Treatment 1) Rust prevention treatment with a chelating agent capable of forming a chelate complex with silver,
(Process 2) Resin processing with polyamide resin or silicon-based resin, and (Process 3) Water-repellent processing with fluorine-based water-repellent resin,
The manufacturing method of the electromagnetic wave shielding material which performs these 3 processes or processes 2 processes 1 and 3 .   The manufacturing method of Claim 1 which performs water-repellent processing after a rust prevention processing.   The manufacturing method of Claim 1 which performs resin processing and water-repellent processing in the same bath after rust prevention processing.   The manufacturing method according to any one of claims 1 to 3, wherein the conductive fiber adheres silver by sputtering, vacuum deposition, or electroless plating.   The electromagnetic wave shielding material manufactured by the manufacturing method in any one of Claims 1-4.   A clothing made of the electromagnetic shielding material according to claim 5. In a fabric knitted with conductive fibers alone or with other fibers with silver attached,
(Treatment 1) Rust prevention treatment with a chelating agent capable of forming a chelate complex with silver,
(Process 2) Resin processing with polyamide resin or silicon-based resin, and (Process 3) Water-repellent processing with fluorine-based water-repellent resin,
The method for preventing deterioration of conductive fibers for electromagnetic wave shielding materials, wherein the three treatments are performed, or the two treatments of treatment 1 and treatment 3 are carried out.

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