JPH1050144A - Conductive material and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To economically produce a conductive material for which carbon fibers are employed and improve the durability of the conductive material by mixing carbon fibers and resin and melting and depositing resin. SOLUTION: Carbon fibers and thermally fusible resin fibers are mixed at a desired ratio and the mixture is woven by a needle to give a mat-like material 1. Then, the mat like material 1 is pressed by a proper pressing apparatus in a pressing process 5 and contracted to have a prescribed thickness. Attributed to the pressing and contracting treatment, fibers 3 melted through a heating process 4 are stuck to one another. A conductive material 6, which is a composite material, in a desire thickness is produced by cooling. In the conductive material 6 produced in this way, since the fibers 3 are stuck one another while being entangled with the fibers 2 in mixture woven state, the fibers 2 are firmly held and fray and separation can be prevented. Moreover, since the conductive material is produced while mixing economical resin, the material can be produced economically as compared with a conventional conductive material produced from only the fibers 2 and at the same time the fibers 2 are prevented from fraying and surely retained and the durability of the material is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a conductive material and a method for manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, utilizing the excellent conductivity of carbon fiber, it has been knitted into a cloth (cloth), felted with a needle, and surface-treated in the above-mentioned state has been used for static electricity. It is used as an antistatic material and an electromagnetic wave shielding material.

[0003]

However, since carbon fibers are expensive, they are used in a limited range as industrial materials.

[0004] For this reason, a cloth formed of only carbon fibers as in the prior art as described above tends to be expensive and difficult to be accepted in the market because a large amount of carbon fibers are used.

In the case where carbon fiber alone is made into a felt state by a needle, the fiber is liable to be frayed, so that the durability is poor. There is a problem that is difficult to match.

Accordingly, an object of the present invention is to provide an inexpensive and durable conductive material using carbon fiber and a method for producing the same.

[0007]

According to a first aspect of the present invention, a carbon fiber (2) and a resin are mixed and the resins are welded to each other. It is a conductive material.

According to a second aspect of the present invention, a conductive material is characterized in that carbon fibers (2) and thermoplastic resin fibers (3) are mixed and the thermoplastic resin fibers (3) are welded to each other. It is.

According to a third aspect of the present invention, there is provided a conductive material in which the glass fiber (8) is mixed in the first or second aspect. The invention according to claim 4 is to mix the carbon fiber (2) and the resin, heat the mixed material to a temperature higher than the melting temperature of the resin, pressurize in this heated state, and compress to a predetermined thickness. This is a method for producing a conductive material characterized by the following.

According to a fifth aspect of the present invention, a carbon fiber (2) and a thermoplastic resin fiber (3) are mixed, and the mixture is heated to a temperature equal to or higher than the melting temperature of the thermoplastic resin fiber (3). This is a method for producing a conductive material, which comprises applying pressure in a heated state and compressing to a predetermined thickness.

The invention according to claim 6 is the method according to claim 4 or 5, wherein the glass fiber (8) is also mixed before heating.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to a first embodiment shown in FIG. In FIG. 1, reference numeral 1 denotes a mat state before pressurization, in which a carbon fiber 2 and a thermoplastic resin fiber 3 are mixed at a desired ratio and are mixed and woven with a needle to form a mat. .

As the thermoplastic resin fiber, use is made of, for example, polyethylene, polypropylene, polyester, etc., which are easily melted by heat. Next, in the heating step 4, the mat-like material 1 is heated to a predetermined temperature by an appropriate heating device. The heating temperature is a temperature at which the thermoplastic resin fibers to be used are melted and bonded to each other, and is set according to the material used.

Next, in the pressing step 5, the mat-like material 1 heated as described above is pressed by a suitable pressing device to be compressed to a predetermined thickness. By this pressurization and compression, the thermoplastic resin fibers 3 melted in the heating step 4 adhere to each other.

Then, the conductive material 6, which is a composite material having a desired thickness, is formed by cooling. Since the conductive material 6 thus formed is bonded in a state where the thermoplastic resin fibers 3 in a mixed state are entangled with the carbon fibers 2, the carbon fibers 2 are firmly held and separated from the carbon fibers 2. Is prevented.

Further, since the carbon fibers 2 are present in a mixed state, the carbon fibers 2 that are exposed on the surface of the conductive material 6 and the carbon fibers 2 that are exposed on the back surface are in an electrically conductive state, and the static electricity is generated. It functions as an antistatic material and an electromagnetic wave shielding material.

The conductive material 6 formed as described above is cut into a desired shape according to the purpose of use and used. Even at the time of this cutting, since the carbon fibers 2 are firmly held between the thermoplastic resin fibers 3, cutting into a desired shape is easy without fraying.

Further, by using the thermoplastic resin fiber 2 as in the present embodiment, the pressure-formed plate-shaped material is heated again to soften it, and the desired deformed shape such as a box shape or the like is formed by a molding die or the like. Can be easily bent into shape.

Further, a thermosetting resin fiber may be used in place of the thermoplastic resin fiber 3 of the first embodiment. Also in this case, the thermosetting resin fibers are melt-bonded to each other by heating, so that the carbon fibers 2 can be prevented from being frayed and the cost can be reduced as in the above embodiment.

FIG. 2 shows a second embodiment of the present invention.
A mat-like material 1 before heating is prepared by mixing a carbon fiber 2 and a resin powder 7. Heating and pressurization of this product 1 in a subsequent step is the same as described above.

As the resin powder 7, a thermoplastic resin or a thermosetting resin is used. As described above, even if the resin powder 7 is used, the resin powder 7 is melt-bonded,
The carbon fibers 2 are held, and the frays are prevented as described above, and the cost can be reduced. In addition, if a thermoplastic resin powder is used, the pressure-formed plate can be easily bent into a deformed shape by reheating in the same manner as described above.

FIG. 3 shows a third embodiment of the present invention.
A mat-like material 1 before heating is prepared by mixing a carbon fiber 2 and a thermoplastic fiber or a thermosetting resin fiber 3 and a glass fiber 8. Heating and pressurization of this product 1 in a subsequent step is the same as described above. In this example,
Resin powder may be used instead of the above resin fibers.

In the third embodiment, the heat insulating property can be further enhanced by the glass fiber 8 in addition to the above effects.

[0024]

As described above, according to the first aspect of the present invention, the conductive material utilizing the excellent conductivity of the carbon fiber is formed by mixing an inexpensive resin. It can be inexpensively molded as compared with those formed only with fibers. Therefore, it is easily accepted in the market as an antistatic material of static electricity or an electromagnetic wave shielding material, and is extremely effective in industry.

Further, it is possible to adjust the use ratio of the carbon fiber and the resin as desired to suit the purpose of use and the required price. Further, even if a resin is mixed, a sufficient conductive function can be ensured.

Further, the carbon fibers are secured without being frayed by the mutual bonding of the resins, and the durability is improved. Therefore, even if it is used for a work table or the like that requires measures to prevent static electricity, it exhibits sufficient durability and can meet required quality.

Further, when a thermoplastic resin is used as the resin in the first aspect of the present invention, the plate-shaped one after the pressure molding is heated again to be softened, and a desired shape such as a box shape is formed by a molding die or the like. It can be easily bent into irregular shapes. Therefore, it is possible to easily form a sealing material that covers the outer periphery of the device and seals the electromagnetic wave.

According to the second aspect of the present invention, in addition to exhibiting the above effects, the thermoplastic resin fibers are entangled with the carbon fibers, and the carbon fibers can be further prevented from being frayed. According to the third aspect of the present invention, a conductive material having a heat insulating property can be further provided by the glass fiber, and the versatility can be improved.

According to the present invention, the conductive material can be easily and reliably manufactured.

[Brief description of the drawings]

FIG. 1 is a diagram showing steps of a manufacturing method of the present invention.

FIG. 2 is a diagram showing a mat-like material before heating in which carbon fiber and resin powder are mixed.

FIG. 3 is a diagram showing a mat-like material obtained by mixing carbon fibers, resin fibers, and glass fibers before heating.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Mixed woven mat-like material 2 ... Carbon fiber 3 ... Thermoplastic resin fiber 4 ... Heating process 5 ... Pressing process 6 ... Molded conductive material 7 ... Resin powder 8 ... Glass fiber

Continuation of the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display location H01B 11/06 H01B 11/06 H05K 9/00 H05K 9/00 W // H05K 1/09 H05K 1/09 A B29K 105: 00 105: 12

Claims (6)

[Claims] 1. A conductive material comprising a mixture of carbon fibers and a resin, wherein the resins are welded to each other. 2. A conductive material characterized in that carbon fibers and thermoplastic resin fibers are mixed, and the thermoplastic resin fibers are welded to each other. 3. The conductive material according to claim 1, wherein glass fibers are mixed. 4. A conductive material, comprising mixing carbon fiber and a resin, heating the mixture to a temperature equal to or higher than the melting temperature of the resin, pressurizing the mixture in this heated state, and compressing the resin to a predetermined thickness. Production method. 5. A method comprising mixing carbon fibers and thermoplastic resin fibers, heating the mixture to a temperature equal to or higher than the melting temperature of the thermoplastic resin fibers, pressurizing the mixture in the heated state, and compressing the mixture to a predetermined thickness. A method for producing a conductive material. 6. A glass fiber is mixed before heating.
Or the manufacturing method of the conductive material of 5.