KR20160108068A - Electrical conductive fiber prepreg and manufacturing method and manufacturing device of the same - Google Patents

Abstract

The present invention relates to electroconductive fiber prepreg, to a manufacturing method thereof, and to a manufacturing device thereof. More specifically, the present invention relates to electroconductive fiber prepreg having excellent mechanical properties and electroconductivity, to a manufacturing method thereof, and to a manufacturing device thereof. The electroconductive fiber prepreg comprises a sheet substance including a nanowire.

Description

FIELD OF THE INVENTION [0001] The present invention relates to an electrically conductive fiber prepreg, a method of manufacturing the same,

The present invention relates to an electrically conductive fiber prepreg having excellent mechanical properties and electrical conductivity, and a manufacturing method and an apparatus for manufacturing the same.

Generally, a fiber-reinforced composite material has high rigidity, strength, and electrical conductivity and is light in weight. Due to such characteristics, the fiber-reinforced composite material can be used as a structural material for aircraft, an automotive structural material, PC case, and sporting goods.

A prepreg is used as a material for composing a fiber reinforced composite material. The prepreg is an intermediate material in which a resin is preliminarily impregnated with a resin as a matrix to the fiber. The prepreg is largely a unidirectional prepreg, And can be divided into prepregs. Unidirectional prepregs have the advantage of excellent strength stiffness in the direction of fiber arrangement, but have a disadvantage in that the physical properties vary greatly depending on the arrangement direction, and the difference in physical properties according to the arrangement direction of the fabric prepreg is smaller than that in the unidirectional prepreg However, when external stress is applied to the crimp, which is the overlapping part between the fiber tows at the time of weaving, there is a disadvantage that the stress concentration is developed and it is difficult to exhibit the physical properties as much as the unidirectional prepreg.

On the other hand, among the uses of fiber-reinforced composite materials, there is a field that requires electrical conductivity or electromagnetic shielding characteristics. Especially, in case of an aircraft, if a lightning strike is encountered during operation, it will cause damage such as spark propagation, localized heat or electromagnetic field propagation to the body. The damage caused by lightning has become an important issue, and studies on the design of the fuselage and the selection of the materials to prevent the damage caused by the lightning have been conducted. Also, in case of automobile ECU, the electromagnetic wave shielding characteristic is required to prevent the malfunction of the sensor, and a metal case should be used for this purpose.

Accordingly, there is a demand for a fiber reinforced composite material which is excellent in mechanical properties and excellent electromagnetic shielding properties, which can be substituted for metals applied to aircraft structural members or automotive ECU cases.

Patent Document 1 is characterized in that indium tin oxide (ITO) nanoparticles are coated on a surface of a carbon fiber by a spraying method to impart electrical conductivity to the surface of the carbon fiber to prepare it as a prepreg. However, if the metal particles are coated only on the carbon fibers, there is a problem that when the resin is impregnated into the resin, electrical conduction in directions other than the direction of arrangement of the fibers is impossible due to insulation by the resin.

Patent Document 2 attempts to prevent insulation by resin by preparing a prepreg by dispersing multi-walled carbon nanotubes in a resin, but there is a problem in that dispersion of carbon nanotubes is difficult and a difference in electric conductivity is caused by each region have.

Patent Document 3 has a problem in that it is difficult to disperse particles and a difference in electric conductivity is large in each portion according to dispersion, similarly to the case of Patent Document 2, in which electrically conductive particles are dispersed in a resin. In addition, the interface with the resin layer due to the introduction of the conductive particles inevitably causes a problem of lowering the strength and rigidity of the carbon fiber composite material.

Patent Document 4 is characterized in that carbon fiber is coated with nickel and nickel particles are dispersed in a resin to prepare a prepreg, followed by molding into a plate material, polishing the surface, and then copper plating to produce a carbon fiber composite material having electric conductivity . However, there is a disadvantage in that the manufacturing process is complicated, and the surface polishing of the composite material has a problem that the mechanical strength is lowered.

Korean Patent Publication No. 10-1092904 Korean Patent Laid-Open Publication No. 2013-0091496 Japanese Laid-Open Patent Publication No. 2013-173812 Japanese Laid-Open Patent Publication No. 1994-207033

SUMMARY OF THE INVENTION It is an object of the present invention to provide an electrically conductive fiber reinforced composite material which can be applied to an aircraft structural member or an ECU case for automobiles by introducing metal nanowires, An object of the present invention is to provide an electrically conductive fiber prepreg excellent in mechanical properties such as tensile strength and compressive strength and excellent in electric conduction properties by providing a fiber prepreg.

It is another object of the present invention to provide a method of manufacturing an electrically conductive fiber prepreg and an apparatus therefor.

These and other objects and advantages of the present invention will become more apparent from the following description of a preferred embodiment thereof.

This object is achieved by an electrically conductive fiber prepreg characterized in that it comprises a sheet-like material containing nanowires.

Here, the sheet material containing the nanowires is transferred to a resin film and then impregnated with a fiber tow or fabric.

Preferably, the nanowire is at least one selected from the group consisting of Fe, Co, Ni, Cu, Au, Ag, and ITO.

Preferably, the nanowire has a diameter of 10 to 200 nm and a length of 5 to 50 탆.

Preferably, the resin film is an epoxy resin.

Preferably, the sheet-like material containing the nanowires is obtained by coating a dispersion containing the nanowires on the surface of the release paper and drying the dispersion.

Preferably, the nanowire comprises from 0.1 to 5% by weight, based on the total weight of the resin impregnated in the prepreg.

The present invention also provides a method for manufacturing a nanowire including a first step of coating a release paper with a dispersion containing nanowires, a second step of drying the release paper coated with the dispersion containing the nanowires to produce a sheet- A third step of laminating a sheet material containing the nanowires and a resin film to produce a resin film on which a sheet material containing nanowires is transferred; A fourth step of separating the film from the releasing paper, and a fifth step of impregnating the resin film transferred with the sheet material containing the nanowires into a fiber tow or fabric to prepare a prepreg, And a method of producing a conductive fiber prepreg.

Here, before the third step, the resin composition may be coated on a release film, followed by drying and curing to prepare a resin film.

Preferably, the fourth step may further include a winding step of winding up the resin film on which the sheet material containing the separated release paper and the nanowire has been transferred, respectively.

Preferably, the fifth system is to produce a prepreg using a hot-melt method.

The object of the present invention can also be achieved by a method of manufacturing an electrostatic latent image bearing member, comprising: a releasing paper roll having a releasing paper roll wound therearound; a coating unit coating a dispersion liquid containing nanowires on a releasing paper fed from the releasing paper roll; A sheet material on which the nanowires from the dryer are fed and a resin film fed from the resin film rolls are joined together to form a resin film on which a sheet material containing nanowires is transferred, And an impregnating portion for impregnating the fiber tow or the fabric with the resin film onto which the sheet material containing the nanowires is transferred.

The coating portion may include a storage tank for storing the nanowire dispersion, a supply line for supplying the nanowire dispersion from the storage tank, and a nanowire coating head for coating the release paper with the nanowire dispersion supplied from the supply line. have.

Preferably, the joint portion may be at least two vertically aligned rollers.

Preferably, the apparatus further comprises a resin film winder for winding up the resin film on which the sheet material containing the nanowires is transferred from the jig, and a release paper separated from the release paper coated with the dispersion containing the nanowires And may further include a take-up paper take-up machine wound up.

Preferably, the impregnating portion may be a roll laminator.

According to the present invention, by introducing a sheet-like material containing electrically conductive nanowires into a resin film, mechanical properties such as tensile strength and compressive strength are excellent, and excellent electrical conductivity can be obtained.

Therefore, when a structural material such as a fuselage for an aircraft is manufactured using an electrically conductive fiber prepreg having excellent mechanical characteristics and electric conduction characteristics, a metal mesh that is needed to prepare for the risk of lightning in the operation of the aircraft is required In addition, it has a merit that it can make a product with better mechanical characteristics. In addition, it has superior advantage in terms of light weight compared to the case of metal material used in the case of manufacturing an automobile ECU case, And so on.

However, the effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the following description.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a view showing an apparatus for producing an electrically conductive fiber prepreg according to an aspect of the present invention. Fig.

Hereinafter, the present invention will be described in detail with reference to embodiments and drawings of the present invention. It will be apparent to those skilled in the art that these embodiments are provided by way of illustration only for the purpose of more particularly illustrating the present invention and that the scope of the present invention is not limited by these embodiments .

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In case of conflict, the present specification, including definitions, will control. Also, although methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention, suitable methods and materials are described herein.

An electrically conductive fiber prepreg according to an aspect of the present invention includes a sheet-like material comprising nanowires. Preferably, the sheet material containing the nanowires may be transferred to a resin film and subsequently impregnated with a fiber tow or fabric. That is, a sheet material containing a nanowire may be transferred to a matrix resin film, and then impregnated with a fiber tow or a fabric.

On the other hand, in general, that the as meaning "electrically conductive" is to say the property that electricity can flow well, if the volume resistivity less than 10 ¹⁰ Ωcm, but can be said that the electric conductivity, the present specification, the less the volume resistivity of about 10 ¹ Ωcm "Excellent electrical conductivity ".

The nanowire is a metal nanowire and is not limited in its kind as long as it is excellent in electrical conductivity and can be made into a nanowire, but it is composed of one or more of the group consisting of Fe, Co, Ni, Cu, Au, .

The diameter of such a metal nanowire is in the range of 10 to 200 nm and the length is in the range of 5 to 50 μm, more preferably 20 to 50 nm in diameter, and 10 to 30 μm in length. If the diameter is less than 10 nm, it is likely to break due to the shearing force at the time of coating, and if it is too thick to exceed 200 nm, the problem of impregnation due to an increase in the surface area of the coated sheet may be caused. Also, if the length is less than 5 mu m, it is difficult to form contact points between the wires, and if the length is excessively longer than 50 mu m, breakage easily occurs.

Also, the content of the metal nanowires is preferably 0.1 to 5 wt% based on the total weight of the resin impregnated in the prepreg. When the content is less than 0.1% by weight, the content of nanowires is small, and when coated on a sheet, the contact points between the wires are reduced, and the electrical conductivity is lowered. Furthermore, when the resin is impregnated and then molded, the nanowires are dispersed in a random form in the resin, since the contact point is reduced more than when the sheet is in the form of a sheet, the electrical conductivity is not sufficient. Also, when the content exceeds 5 wt%, the contact area between the wires increases, which is advantageous from the viewpoint of electrical conductivity. However, the surface area of the wire is widened to reduce the contact area between the resin layer and the fiber at the time of impregnation with the fiber tow or fabric after being transferred to the resin layer Resulting in a problem that the impregnating property and adhesion between the resin layer and the fibrous layer are deteriorated.

The metal nanowires are preferably formed in a sheet form. When the metal nanowires are dispersed in a resin without preparing them in a sheet form, the nanowires are broken by the shear force generated during dispersion, and the wires are changed into particles in a severe dispersion condition. In this case, there is a problem that electric conduction is caused due to the contact between the wires due to the characteristic of the wire, that is, a small amount of wire is lost, and a problem that a larger amount of wire is inputted causes a problem .

In the present specification, the resin film as the impregnation resin in the present invention may be a thermoplastic resin such as polyester, polypropylene resin, or a thermosetting resin such as an epoxy resin or a phenol resin. However, in view of excellent mechanical properties and heat resistance, Epoxy resins are preferred.

As such an epoxy resin, a compound having a plurality of epoxy groups in the molecule is used, and in particular, amines, phenols, and compounds having carbon-carbon double bonds are preferably used. Examples of such resins include bisphenol type epoxy resins such as bisphenol A type epoxy resins, bisphenol F type epoxy resins and bisphenol S type epoxy resins, and novolak type epoxy resins such as phenol novolak type epoxy resins and cresol novolak type epoxy resins These may be used alone or in combination of two or more.

As the epoxy resin composition, a curing agent is used, and as the curing agent, any curing agent can be used as long as it is a compound having an active group capable of reacting with an epoxy group. Preferably, a compound having an amino group, an acid anhydride group and an azide group is used. Specifically, various isomers of dicyandiamide, diaminodiphenylsulfone, and amino benzoic acid esters can be used.

Examples of the coating method of the resin composition include a gravure coating method, a blade coating method, a wire bar coating method, a reverse coating method, and a comma coating method, but the kind thereof is not particularly limited as long as it is a coating method capable of producing a resin film.

A method of manufacturing an electrically conductive fiber prepreg according to another aspect of the present invention includes a first step of coating a release paper with a dispersion containing nanowires, a step of drying the release paper coated with the dispersion containing the nanowires, A second step of producing a sheet-like material, a third step of laminating a sheet-like material containing nanowires and a resin film to produce a resin film onto which a sheet-like material containing nanowires is transferred, A fourth step of separating the resin film transferred with the sheet material from the releasing paper, and a fifth step of impregnating the resin film transferred with the sheet material containing nanowires into a fiber tow or a fabric to prepare a prepreg do.

The first and second steps are for producing a sheet-like material containing nanowires. The dispersion containing the nanowires is directly applied to the surface of the release paper by a gravure coater, a blade coater, a wire bar coater, Coating method and dried in a dryer, but the method is not particularly limited as long as the nanowire is not broken during coating.

The third step is a step of producing a resin film in which a sheet-like material containing nanowires is transferred by laminating a sheet-like material containing nanowires and a resin film. In the method of introducing the sheet material containing nanowires into the prepreg, it is preferable that the sheet material is directly transferred to the resin film. The sheet-like material is coated on the release paper, and at the same time, it can be transferred to the surface of the resin film by laminating with a resin film previously coated. The nanowires can be introduced onto the prepreg by impregnating the fibrous tow or fabric with the resin film onto which the sheet material containing the nanowires is transferred. The above method is preferable because it is impossible to uniformly introduce the nanowire on the prepreg without using such a method.

Further, before the third step, the resin composition may be coated on a release film, followed by drying and curing to prepare a resin film.

The fourth step may further include a winding step of winding up the resin film on which the sheet material containing the separated release paper and the nanowire has been transferred, respectively. That is, the release paper can be taken up by the release paper winder 10 and the resin film on which the sheet material containing nanowires is transferred can be taken up in the resin film winder 9.

The fifth step is a step of preparing a prepreg by impregnating a fiber tow or a fabric with a resin film onto which a sheet-like substance containing a nanowire is transferred, and preparing a prepreg using a hot-melt method. As a method for producing the fiber prepreg, a hot-melt method is preferable. The hot-melt method is a method which is usefully used because there is no solvent remaining in the prepreg, and a low viscosity epoxy resin composition is coated on a film, and a resin film is laminated on both sides or one side of the fiber tow sheet or fabric, And impregnating the fiber sheet with the composition. In the resin film, the coating thickness of the resin composition can be variously adjusted depending on the resin content of the prepreg, but it is preferably 10 to 100 탆.

In this specification, in order to form a fiber-reinforced composite material using the prepreg, it is preferable to heat-cure the epoxy resin composition while applying pressure to a laminate obtained by cutting a prepreg to a predetermined size and stacking a predetermined number of sheets Do. Examples of a method of heating and curing an epoxy resin composition while applying heat and pressure include a press molding method, an autoclave molding method, a bugging molding method, a lapping tape method, and an internal pressure forming method. The temperature for molding the fiber-reinforced composite material varies depending on the glass transition temperature of the epoxy resin, the kind of the curing agent, and the like, but is usually adjusted in the temperature range of 80 to 220 캜. By controlling the molding temperature to an appropriate range, a composite material having a sufficient degree of curing can be obtained, and the effect of suppressing the occurrence of warping due to excessive temperature can be obtained. The pressure for molding the fiber-reinforced composite material varies depending on the thickness of the prepreg, the kind of the resin, the resin content, and the like, but is usually adjusted in the pressure range of 0.1 to 1 MPa. By setting the molding pressure to an appropriate range, sufficient impregnation can be carried out to the inside of the prepreg.

1, there is shown an apparatus for producing an electrically conductive fiber prepreg according to another embodiment of the present invention, which comprises a release paper roll 1 around which a release paper is wound and a release paper supplied from the release paper roll 1 are coated with a dispersion containing nanowires A drying unit 5 for drying the dispersion containing the nanowires to produce a sheet-like material containing the nanowires, a sheet 5 containing the nanowires from the dryer 5, (7, 8) for producing a resin film to which a sheet material containing nanowires is transferred by laminating a material and a resin film fed from a resin film roll (6), and a sheet material And an impregnation unit (not shown) for impregnating the transferred resin film into a fiber tow or fabric.

The coating portion 2, 3, 4 according to one embodiment is provided with a storage tank 2 for storing the nanowire dispersion liquid, a supply line 3 for supplying the nanowire dispersion liquid from the storage tank, And a nanowire coating head 4 coating the release nanowire dispersion onto the release paper.

The joint portion according to one embodiment may be at least two vertically abutted rollers 7, 8. The joint portion is composed of at least two vertically opposed rollers, and functions to transfer the sheet-like material containing the nanowires to the resin film by bringing the sheet material containing the nanowires into contact with the resin film. Since the resin film has a sticky property, the sheet-like material can be easily transferred to the resin film only by a small pressure contact with the sheet material containing the nanowire.

In addition, the manufacturing apparatus according to an embodiment includes a resin film winding machine 9 for winding up a resin film on which a sheet-like substance containing nanowires from the joint portions 7 and 8 is transferred, and a dispersion liquid containing nanowires The apparatus may further include a release paper winder 10 for winding the release paper separated from the coated release paper.

Also, the impregnation unit according to one embodiment may be a roll laminator, and a resin film on which a sheet material containing a nanowire is transferred may be impregnated with a fiber tow or a fabric using a hot melt method using the roll laminate to produce a prepreg.

Further, a manufacturing apparatus according to one embodiment may be provided with additional apparatus if necessary. In particular, in the case of a thermoplastic resin film, a device for heating the sheet-like material containing nanowires to a temperature not lower than the glass transition temperature and not higher than the melting point may be introduced to bond the sheet-like material to the resin film.

Hereinafter, the structure and effect of the present invention will be described in more detail with reference to examples and comparative examples. However, this embodiment is intended to explain the present invention more specifically, and the scope of the present invention is not limited to these embodiments.

[Examples 1 to 3]

[Preparation Example 1: Production of sheet-like material containing metal nanowires]

A silver nano wire dispersion in which silver nano wire having a diameter of 30 nm and a length of 20 m was dispersed in IPA (Iso Proyl Alcohol) at a concentration of 10% by weight was uniformly applied to the surface of the release paper cut into A4 size using a wire bar coater Coated and dried in a dryer at 90 ° C. The measured weight of the sheet-like material comprises a silver coated wire comprising the silver wire, respectively of ^{0.04g / m 2, 1.2g / m} 2 and 2g / m ² in terms of the weight per unit area of 1m ² of the sheet material Respectively, to obtain Examples 1, 2 and 3, respectively.

[Production Example 2: Production of resin film]

100 parts by weight of bisphenol A diglycidyl ether resin (Epikote-1001, Japan Epoxy Resin Co., Ltd.), 90 parts by weight of phenol novolak polyglycidyl ether resin (Epiclon-N740, Dainippon Ink) (DICY7, Japan Epoxy Resin Co., Ltd.) and 13 parts by weight of 3,3'-diaminodiphenylsulfone (3,3'-DDS, Japanese explosive) were added to methyl ethyl ketone and uniformly stirred and mixed to prepare an epoxy resin A composition was prepared.

The epoxy resin composition thus prepared was applied to a release film (XP3BR, Toray Advanced Material Co., Ltd.) cut to A4 size using a wire bar coater to a thickness of about 35 mu m and dried and cured in a dryer at 130 DEG C for 10 minutes. Measuring the weight of the dried resin film in terms of the weight per unit area of 1m ² to obtain a resin film of 40g / m ^2.

[Preparation Example 3: Preparation of prepreg]

The sheet material containing silver nano wires prepared in Preparation Example 1 and the resin film prepared in Production Example 2 were laminated using a roll laminator to prepare a resin film on which a sheet material containing silver wire was transferred. The thus prepared resin film was superimposed on both sides of a uniformly arranged carbon fiber sheet (TORAY, TORAYCA-T700SC-12K_50C) of A4 size and passed through a roll laminator heated to 120 캜 to prepare a unidirectional carbon fiber prepreg. The carbon fiber sheet was 150g when converted to the weight per unit area of 1m ^2. The thus-prepared carbon fiber prepreg had FAW of 150 g, a resin content of 35%, and a thickness of about 160 탆.

[Preparation Example 4: Preparation of prepreg laminated sheet]

Seven sheets of the prepregs prepared in Production Example 3 were laminated in the same direction and molded at a temperature / pressure of 120 DEG C / 0.3 MPa for 1 hour to prepare a prepreg laminate having a thickness of about 1 mm.

[Comparative Examples 1 and 2]

The sheet material of 0.02 g / m ² (Comparative Example 1) and 4 g / m ² (Comparative Example 2) in Preparation Example 1 of the Example was obtained to prepare a prepreg laminated sheet. .

[Comparative Example 3]

Seven sheets of CU150NSL35 of Korean Carbon were laminated and molded in the same direction as in Production Example 4 to prepare a prepreg laminate. In the case of CU150NSL35, carbon fibers of the same grade as TORAYCA-T700SC-12K50C used in Example 1 are used and have similar mechanical properties.

[Comparative Example 4]

Seven sheets of USN150A of SK Chemicals were laminated in the same direction as in Production Example 4 and molded to prepare a prepreg laminate. In the case of USN150A, carbon fibers of the same grade as TORAYCA-T700SC-12K50C used in Example 1 are used and have similar mechanical properties.

Example Comparative Example One 2 3 One 2 3 4 Silver nano wire content
(weight%) 0.1 3 5 0.05 10 0
(CU150NSL35) 0
(USN150A) Carbon fiber type T700SC-12K_50C Carbon fiber use equivalent to T700SC-12K_50C Resin type Epoxy resin FAW
(g / m ² ) 150 150 150 150 150 150 150 Resin content
(%) 35 35 35 35 35 35 35 Prepreg
Laminate thickness
(mm) 1.19 1.16 1.08 1.20 1.13 1.03 0.99

The properties of the prepreg laminates according to Examples 1 to 3 and Comparative Examples 1 to 4 were measured through the following experimental examples, and the results are shown in Table 2 below.

[Experimental Example]

1. Electrical conductivity measurement

The volume resistivity of the molded prepreg laminate was measured for electromagnetic shielding ability measurement. The molded CFRP laminate was cut to a width of 50 mm in the transverse direction (direction of the fiber array) and 10 mm in the longitudinal direction (direction perpendicular to the fiber array), and then a specimen for volume resistance was manufactured. The volume resistivity was measured using a volumetric resistor (MITSUBISHI CHEMICAL Co., MCP-T610). Volumetric resistance is measured by measuring the potential difference between the two probes on the inner side with a constant current flowing between the two probes at both ends by placing the four-pin electrode on the specimen in a four-probe method on the specimen .

2. Measurement of mechanical properties (tensile strength, compressive strength)

A test piece for mechanical property measurement test was prepared using the molded prepreg laminate. The test was conducted using an Instron Model 5985 (Extra Height) UTM and a load cell with a maximum load of 10 tons was used. The tensile strength of the test specimens was based on ASTM D3039 and the compressive strength was based on SACMA 1R94.

Example Comparative Example One 2 3 One 2 3 4 Volume resistance
(Ωcm) 10.5 11.1 1.6 270 0.9 230 202 The tensile strength
(MPa) 2,540 2,420 2,600 2,590 1,910 2,680 2,740 Compressive strength
(MPa) 1,580 1,390 1,410 1,360 1,060 1,420 1,440

As can be seen from Table 2, in Examples 1 to 3 according to one embodiment of the present invention, excellent tensile strength and compressive strength were obtained as compared with Comparative Examples 1 to 4, and volume resistance was remarkably low, It can be seen that it has electric conductivity. However, when the nanowire content is less than 0.1 wt% (Comparative Example 1), the electrical conductivity is not increased, and when the nanowire content is more than 5 wt% (Comparative Example 2), the electrical conductivity is excellent, but the tensile strength and compressive strength are remarkably lower. It is considered that this is due to the deterioration of the resin impregnation property due to the increase of the silver nano wire content and it is considered that there is a restriction because it does not manifest sufficient mechanical properties in actual use.

Therefore, the electroconductive fiber prepreg according to an embodiment of the present invention is excellent in electrical conductivity, light weight, high strength and high rigidity, and is easily applicable to fields requiring electrical conductivity or electromagnetic shielding characteristics. Especially, it is expected to be applied to such fields as automobile ECU cases that require electromagnetic shielding characteristics to prevent malfunction of aircraft structural materials and automobile sensors, which require electromagnetic shielding characteristics, in order to prevent damage caused by lightning in aircraft operation.

It is to be understood that the present invention is not limited to the above embodiments and various changes and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention.

1: Release roll
2: Nanowire dispersion tank
3: Nanowire dispersion supply line
4: Nanowire Coated Head
5: Dryer
6: Resin film roll
7: Upper roller
8: Lower roller
9: Resin film winding machine
10: Bubble wrapping machine
11: Nanowire sheet
12: Resin film

Claims (16)

≪ / RTI > wherein the electrically conductive fiber prepreg comprises a sheet-like material comprising nanowires. The method according to claim 1,
Wherein the sheet material containing the nanowires is transferred to a resin film and then impregnated with a fiber tow or fabric. The method according to claim 1,
Wherein the nanowire is at least one selected from the group consisting of Fe, Co, Ni, Cu, Au, Ag, and ITO. The method according to claim 1,
Wherein the nanowire has a diameter of 10 to 200 nm and a length of 5 to 50 占 퐉. The method according to claim 1,
Wherein the resin film is an epoxy resin. The method according to claim 1,
Wherein the sheet-like material containing the nanowires is obtained by coating a dispersion containing the nanowires on the surface of a release paper and drying the dispersion. 7. The method according to any one of claims 1 to 6,
Wherein the nanowire comprises from 0.1 to 5 weight percent based on the total weight of the resin impregnated in the prepreg. A first step of coating a release paper with a dispersion containing nanowires,
A second step of drying the release paper coated with the dispersion containing the nanowires to produce a sheet material containing the nanowires,
A third step of laminating a sheet material containing the nanowires and a resin film to produce a resin film on which a sheet material containing nanowires is transferred,
A fourth step of separating the resin film transferred with the sheet material containing the nanowires from the release paper,
And a fifth step of impregnating the resin film transferred with the sheet material containing the nanowires into a fiber tow or a fabric to prepare a prepreg. 9. The method of claim 8,
[7] The method of claim 1, further comprising, before the third step, coating the release composition with a resin composition, followed by drying and curing to produce a resin film. 9. The method of claim 8,
Wherein the fourth step further comprises a winding step of winding up the resin film on which the sheet material containing the separated release paper and the nanowire has been transferred, respectively. 9. The method of claim 8,
Wherein the fifth system is a prepreg produced by using a hot-melt method. A release paper roll 1 which winds the release paper,
Coating units 2, 3 and 4 for coating the release paper supplied from the release paper roll 1 with a dispersion containing nanowires,
A drier (5) for drying the dispersion containing the nanowires to produce a sheet-like material containing the nanowires,
(7) for producing a resin film on which a sheet material containing nanowires is transferred by laminating a sheet material containing nanowires from the dryer (5) and a resin film fed from a resin film roll (6) , 8)
And an impregnation unit for impregnating the fiber tow or the fabric with the resin film onto which the sheet material containing the nanowires is transferred. 13. The method of claim 12,
The coating unit comprises a storage tank (2) for storing nanowire dispersion, a supply line (3) for supplying the nanowire dispersion liquid from the storage tank, and a nano wire dispersion coating unit for coating the release nano wire dispersion supplied from the supply line And a wire coating head (4). ≪ RTI ID = 0.0 > 11. < / RTI > 13. The method of claim 12,
Wherein the joint portion is at least two vertically opposed rollers (7, 8). 13. The method of claim 12,
The apparatus comprises a resin film winding machine 9 for winding up a resin film on which a sheet-like substance containing the nanowires from the joint portions 7, 8 is transferred,
Further comprising a release paper unwinder (10) for winding a release paper separated from the release paper coated with the dispersion containing the nanowires. 16. The method according to any one of claims 12 to 15,
Wherein the impregnating portion is a roll laminator.

Images