KR101891813B1 - Conductive non-woven fabric and its manufacturing method - Google Patents

Abstract

One embodiment of the present invention is a fiber sheet comprising: a fibrous sheet layer; And a coating layer disposed on an upper surface or a lower surface of the fibrous sheet layer and including a conductive material, wherein a mass ratio of the fibrous sheet layer to the coating layer is 1:10 to 10: 1, Wherein the total thickness of the fibrous sheet layer and the coating layer is from 15 gsm to 200 gsm and the fibrous sheet layer to which the coating layer is bonded is heat treated, And a manufacturing method thereof.

Description

TECHNICAL FIELD [0001] The present invention relates to a conductive nonwoven fabric,

The present invention relates to a conductive nonwoven fabric and a conductive nanomaterial-coated nonwoven fabric produced by the method, and more particularly, to a nonwoven fabric having higher conductivity than a nonwoven fabric made of conventional conductive fibers, And a method for producing the nonwoven fabric.

Recently, due to the rapid spread of digital devices, the threat of electromagnetic interference in everyday life is increasing. Electromagnetic wave refers to electric and magnetic waves including electric and magnetic fields generated by electrical products and electronic products, and snakes. Recently, electric and electronic devices tend to be developed with complexity, diversification, light weight, small size, and thinness, and in the circuit, high performance, high density, high integration and complexity are progressing. This trend provides an environment in which electromagnetic noise can more easily cause noise and disturbance of the device. Electromagnetic waves can cause noise and interference due to radio interference between the transmitting and receiving equipment, degradation of the efficiency and lifetime of internal electronics, and disturbance between electronic equipment. In fact, the incidence of failures related to communication equipment, malfunctions of computers, and safety are increasing.

Furthermore, when the electronic device is used for a certain period of time, it is required to serve as a heat dissipation material for removing heat generated from parts such as a battery, a CPU, and a display. Polymer composite materials with electromagnetic wave shielding efficiency have been developed by adding carbon fiber and graphene to shield electromagnetic waves and perform heat dissipation functions. However, due to problems of dispersion and mechanical properties, It has many problems.

Further, Patent Document 1 relates to a heat-radiating sheet having an electromagnetic wave shielding function, and there is a reference to EMI powder. However, the concept is limited to a material, and further, after the powder treatment, a high- .

Accordingly, the present invention can provide a conductive nonwoven fabric having a high thermal conductivity and a small thickness after coating a conductive material on a nonwoven fabric, followed by densification and carbonization, and a method for manufacturing the same.

Patent Document 1: Korean Patent Publication No. 10-0830945

SUMMARY OF THE INVENTION The present invention provides a conductive nonwoven fabric and a nonwoven fabric according to the manufacturing method thereof.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not intended to limit the invention to the precise form disclosed. There will be.

According to an aspect of the present invention, And a coating layer disposed on an upper surface or a lower surface of the fibrous sheet layer and including a conductive material, wherein a mass ratio of the fibrous sheet layer to the coating layer is 1:10 to 10: 1, Wherein the total thickness of the fibrous sheet layer and the coating layer is from 15 gsm to 200 gsm and the fibrous sheet layer to which the coating layer is bonded is heat treated. to provide.

In an embodiment of the present invention, the fiber sheet layer may further include carbon fibers.

In order to accomplish the above object, there is provided a method for producing a fiber sheet, comprising the steps of: wet laid a first combination comprising cut fibers to form a fiber sheet layer; Coating a coating liquid containing a conductive material on the upper or lower surface of the fibrous sheet layer to form a coating layer; Drying the coating layer; And heat treating the fibrous sheet layer to which the coating layer is bonded, wherein a mass ratio of the fibrous sheet layer to the coating layer is 1:10 to 10: 1, and the sum of the fibrous sheet layer and the coating layer The total thickness is 0.01 mm to 1 mm, and the total weight of the fibrous sheet layer and the coating layer is 15 gsm to 200 gsm.

In an embodiment of the present invention, the fiber sheet layer may further include carbon fibers.

In one embodiment of the present invention, the heat treatment step may be a step of densifying the fiber sheet layer bonded with the coating layer, followed by carbonizing or densifying the carbonized layer.

According to an embodiment of the present invention, a nonwoven fabric having high thermal conductivity or a filter material using the nonwoven fabric can be manufactured by introducing a densification process and a carbonization process in addition to the process of coating a conductive material on a general fiber sheet.

Further, the conductive fiber sheet may further include carbon fibers to further increase the conductivity.

When the conductive fiber is used, the conductivity can be increased. However, when the coated fiber sheet or the nonwoven fabric is subjected to the densification process and carbonization, the thickness becomes thin, while the conductivity becomes higher, Even when used in electrical equipment, the volume of electrical equipment can be reduced while maintaining high conductivity, and the value of commercialization also increases.

It should be understood that the effects of the present invention are not limited to the above effects and include all effects that can be deduced from the detailed description of the present invention or the configuration of the invention described in the claims.

1 is a schematic view of a conductive nonwoven fabric manufacturing process of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when a part is referred to as being "connected" (connected, connected, coupled) with another part, it is not only the case where it is "directly connected" "Is included. Also, when an element is referred to as "comprising ", it means that it can include other elements, not excluding other elements unless specifically stated otherwise.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, the terms "comprises" or "having" and the like refer to the presence of stated features, integers, steps, operations, elements, components, or combinations thereof, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Hereinafter, the conductive nonwoven fabric subjected to heat treatment after coating the conductive material will be described.

In order to achieve the technical object of the present invention, And a coating layer comprising a conductive material, wherein the mass ratio of the fibrous sheet layer to the coating layer is 1:10 to 10: 1, the fibrous sheet layer and the coating layer The total thickness of the fibrous sheet layer and the coating layer is 15 gsm to 200 gsm and the fibrous sheet layer to which the coating layer is bonded is heat treated. do.

In the present invention, the fibrous sheet layer may be formed of a fibrous sheet such as polyethylene terephthalate fiber, polyethylene fiber, polypropylene fiber, polybutylene fiber, terephthalate fiber, polyamide fiber, polyurethane fiber, polybutene fiber, polylactic acid fiber, , Polyphenylene sulfide fibers, polyacrylonitrile fibers, polyester fibers, glass fibers, aramid fibers, ceramic fibers, metal fibers, polyimide fibers, polybenzoxazole fibers, natural fibers, One or more fibers selected may be used.

Particularly, the polyester fiber may be selected from the group consisting of polyethylene terephthalate (PET), polyglycolide (PGA), polylactic acid (PLA), polycaprolactone (PCL), polyhydroxyalkanoate (PHA), polyhydroxybutyrate ), Polyethylene adipate (PEA), polybutylene succinate (PBS), poly (3-hydroxybutyrate-co-3-hydroxyvalerate (PHBV), polybutylene terephthalate But are not limited to, terephthalate (PTT), polyethylene naphthalate (PEN), and Vectran.

On the other hand, the fiber sheet layer to which the method of the present invention is applied can be produced by mixing the above-described fibers (referred to as first fibers) with the second fibers as reinforcing fibers. The reinforcing fiber is a low melting fiber or a low melting filament, for example, a low melting point polyester fiber (LMP) can be used as a material for increasing the strength of the nonwoven fabric. The low melting point polyester fiber has a melting point lower than the melting point of general polyester of 255 DEG C and is used for heat fusion purposes.

According to the present invention, the low melting point fiber as the second fiber is a low melting point polyethylene terephthalate (low melting PET). Since the low melting point polyethylene terephthalate has a relatively low melting point, it melts when heated to about 100 캜 and is mixed with the first fiber, thereby increasing the strength of the entire nonwoven fabric.

In an embodiment of the present invention, the fiber sheet layer may further include carbon fibers. Further incorporation of carbon fibers has better thermal conductivity properties than ordinary fibers and increases the strength of nonwoven fabrics containing fibers.

However, the carbon fiber may include 10 wt% to 40 wt% of the total weight of the conductive nonwoven fabric.

If the carbon fiber content is less than 10 wt%, the mechanical tensile strength of the entire nonwoven fabric may be lowered. If the carbon fiber content is more than 40 wt%, the porosity of the nonwoven fabric may be increased and the conductivity of the nonwoven fabric may be lowered.

In this case, the fineness of the carbon fibers and the remaining fibers may be 5 탆 to 10 탆.

In one embodiment of the present invention, the thermal conductivity of the conductive nonwoven fabric may be 10 (W / (mK)) to 500 (W / (mK)).

In the present invention, the conductive material may be a carbon-based compound such as carbon, graphene, graphite, carbon, carbon nanotube, carbon black, Based carbon-based additive.

Further, a sendust or a ferrite may be included in the conductive material.

In particular, the thickness of the graphene may be between 5 nm and 100 nm.

As the solvent of the coating liquid containing the conductive material, a non-polar solvent may be used. As the non-polar solvent, isopropyl alcohol (C ₃ H ₈ O) may be used.

In another embodiment of the present invention, the graphene may have a concentration of 5 to 15 g / l in a solution of isopropyl alcohol as a solvent.

In the present invention, the coating layer may contain 7 wt% to 35 wt% of metal relative to the total weight.

The addition of the metal not only increases the conductivity of the nonwoven fabric but also increases the mechanical strength by increasing the bond between the fiber sheet layer and the carbon compound used in the coating solution.

In another embodiment of the present invention, the metal includes at least one selected from the group consisting of Ni, Cu, and Al. However, the kind of metal is not limited to the above-mentioned metal.

Hereinafter, the conductive nonwoven fabric manufacturing method will be described in detail.

In order to accomplish the technical object of the present invention, there is provided a method for producing a fiber sheet, comprising the steps of: wet laid a first combination comprising cut fibers to form a fiber sheet layer; Coating a coating liquid containing a conductive material on the upper or lower surface of the fibrous sheet layer to form a coating layer; Drying the coating layer; And heat treating the fibrous sheet layer to which the coating layer is bonded, wherein a mass ratio of the fibrous sheet layer to the coating layer is 1:10 to 10: 1, and the sum of the fibrous sheet layer and the coating layer The total thickness is 0.01 mm to 1 mm, and the total weight of the fibrous sheet layer and the coating layer is 15 gsm to 200 gsm.

1,

A first formulation comprising the cut fibers is wet laid to form a fibrous sheet layer (S110).

The wet lamination is a step of forming a slurry by dispersing the fibers in water in the form of cutting the fibers, and then peeling off the layer on the water surface, followed by pressing.

Furthermore, in order to uniformly distribute the fibers in the nonwoven fabric or the fiber sheet, a nonwoven fabric is generally prepared by a wet laid process. In this case, before the wet process, the fibers are chopped into a predetermined length .

It is common that each of the fibers included in the fibrous sheet layer is in a cut form (chop shape), and each of the cut fibers has a length of 1 to 300 mm. In this case, the diameter may be 0.01 to 1.5 De. De (Denier) is a unit for indicating the thickness of fiber which means fineness, and 1 denier means the thickness when 9000m of yarn is made with 1g of yarn. When De is converted into mm units, the diameters may be 0.01 mm to 1 mm, and the length may be 1 mm to 5 mm.

After wet laid, a coating liquid containing a conductive material is coated on the upper or lower surface of the fibrous sheet layer to form a coating layer (S120).

The method of coating the coating liquid to form a coating layer is not limited to the nonwoven fabric produced by the wet lamination, but may be applied to the nonwoven fabric by various known manufacturing methods. For example, a dry nonwoven fabric, a wet nonwoven fabric or a spunbond nonwoven fabric.

In the present invention, the conductive material may be a carbon-based compound such as carbon, graphene, graphite, carbon, carbon nanotube, carbon black, Based carbon-based additive.

Further, a sendust or a ferrite may be included in the conductive material.

In the coating solution, 7 to 35 wt% of metal may be included relative to the total weight.

In one embodiment of the present invention, the metal may include at least one selected from the group consisting of nickel (Ni), copper (Cu), and aluminum (Al).

When the metal is added, not only the conductivity is increased but also the bonding strength between the fiber sheet and the carbon compound used in the coating solution is increased to increase the mechanical strength.

In one embodiment of the present invention, the method for coating the coating liquid is one of a method using an impregnation method, a knife method, a gravure method, and a spray method.

The impregnation method is a method in which a fiber sheet is completely immersed in a coating solution containing a conductive material and then kept in a state of being held for a predetermined time to completely adhere the conductive material to the surface of the fiber sheet.

The gravure refers to a method of filling a concave portion of a printing plate with a coating liquid containing a conductive material and pressing the ink in the recessed portion to apply a substance to the fiber sheet to form a film.

The spraying method is a method in which a coating solution containing a conductive material is sprayed and uniformly applied to a fiber sheet.

In the coating by the impregnation method, the process of immersing the nonwoven fabric at least once in the coating liquid and then removing the nonwoven fabric may be repeated one or more times. Further, the above process can be repeated while increasing the concentration of the conductive material in the coating liquid.

After the coating layer is formed on the fibrous sheet layer, the coating layer is dried (S130).

Wherein the conductive nanomaterial-coated nonwoven fabric is dried under the above-mentioned drying conditions at a temperature of 80 ° C to 150 ° C for 1 minute to 30 minutes.

In the drying method, at least one of drying methods using air blow drying, hot air drying, and a can dryer may be used. However, the drying method is not limited to the above drying method, and other drying methods may be used.

The air drying method is a method in which air is forcibly passed and dried. The hot air drying method is similar to the air blow drying method except that the air is first heated and then dried. The method using the can dryer includes a method of blowing air or a method using hot air, and a fan is attached to the shaft of the motor, so that air is blown out through a tuyere.

After drying the coating layer, the fiber sheet layer to which the coating layer is bonded is heat treated (S140).

Wherein the heat treatment step is a step of densifying the dried fiber sheet and then carbonizing or densifying the dried fiber sheet after carbonizing the dried fiber sheet.

Wherein the densifying step is performed by thermal calendering or hot plate pressing.

In the case of thermal calendering, the nonwoven fabric is pressed using a heated roller, and in the case of hot plate pressing, a certain pressure is applied to the heated plate to press the nonwoven fabric.

In one embodiment of the present invention, thermal calendering can be performed at a temperature of 100 ° C to 150 ° C, a linear pressure of 50 bar to 80 bar, and a rate of 1 M / min to 5 M / min.

In another embodiment of the present invention, the carbonizing step is a step of carbonizing the dried fiber sheet at a heating rate of 1 (캜 / min) to 10 (캜 / min) under an air flow condition including an inert gas, ° C. and maintaining the heated fiber sheet at 600 ° C. to 1000 ° C. for 5 hours to 15 hours.

At this time, in the carbonizing step, heating the carbon fiber layer to a temperature limited to a predetermined temperature, and then maintaining the heated temperature for a predetermined time is sufficient to transfer sufficient heat to carbonize the carbon fiber layer I can not. Furthermore, when the temperature exceeds 1000 ° C., excessive heat is applied to the carbon fiber layer, and the mechanical tensile strength of the carbon fiber layer itself may be lowered during the carbonization process.

When the heat treatment is completed, the mass ratio of the fibrous sheet layer to the coating layer is 1:10 to 10: 1, the total thickness of the fibrous sheet layer and the coating layer is 0.01 mm to 1 mm, Wherein the total weight of the fibrous sheet layer and the coating layer is 15 gsm to 200 gsm.

In one embodiment of the present invention,

The conductive nonwoven fabric is produced by the production method of the present invention.

The thermal conductivity of the conductive nonwoven fabric may be 10 (W / (mK)) to 500 (W / (mK)).

Production Example 1: A conductive nonwoven fabric obtained by coating a conductive material on a fiber sheet and then heat-

In the embodiment according to the manufacturing method shown in Fig. 1,

More particularly, in a step (S110) of wet lamination of a first combination containing carbon fibers to produce a fiber sheet layer comprising carbon fibers,

First, carbon fibers (12k, purchased from Toray, Hyosung or TK) were cut to 1 to 5 mm, and then the cut carbon fibers were dispersed in water to form a slurry. After the slurry was floated in water, a layer of 0.01 mm to 1 mm was formed in water through left-right vibration. The layer was then rolled up and dried, followed by pressing on a roller to form a fibrous sheet layer.

On the other hand, in order to increase the strength of the polyethylene terephthalate fiber and the nonwoven fabric on the fiber sheet, the low melting point polyethylene terephthalate fiber of the low melting point fiber is cut to 1 to 5 mm, and then the carbon fiber is cut to form a blend, Were added together to prepare a fiber sheet layer in the same manner as described above.

(S120) forming a coating layer by coating a coating liquid containing a conductive material on the fibrous sheet layer, and drying the coating layer (S130)

More specifically, according to one embodiment of the present invention, the fiber sheet is coated with a solution of graphene having a size of 5 to 100 탆 and a thickness of 5 to 100 nm in a concentration of 1 g / l to 20 g / l in isopropyl alcohol Times. The coating layer having been subjected to the impregnation step is then blow-dried at a temperature of 80 to 150 DEG C for 1 to 30 minutes.

In the heat treatment step (S140), the fiber sheet layer to which the coating layer is bonded,

 Temperature calendering under the conditions of a temperature of 100 to 150 DEG C, a line pressure of 50 bar to 80 bar, a speed of 1 M / min to 5 M / min,

The high-density fiber sheet is heated to 600 to 1000 占 폚 at a heating rate of 1 (占 폚 / min) to 10 (占 폚 / min) under an air flow condition including an inert gas, Lt; 0 > C to 1000 < 0 > C for 5 to 15 hours.

The thermal conductivity according to the embodiment is as shown in Table 1.

    Item Total basis weight
(gsm) graphene coating amount (gsm) Overall Thickness
(mm) specific heat
(J / gK) Thermal diffusivity
(mm ² / s) Thermal conductivity
(W / (mK)) First Embodiment 43 23 0.143 1.261 13.680 38.597 Second Embodiment 43 23 0.070 0.697 417.86 80.093 Third Embodiment 58 38 0.024 0.882 595.208 470.256 Fourth Embodiment 43 23 0.172 0.996 9.374 5.742 Fifth Embodiment 72 55 0.054 0.674 37.354 31.370 Sixth Embodiment 46 55 0.057 0.842 276.432 73.318

(gsm: g / m ² , De: Denier)

Example 1: A fiber sheet layer in which 80 wt% of 7 μm carbon fibers and 20 wt% of 1.1 De low melting point polyethylene terephthalate were blended was made only by graphene coating.

Example 2 After graphene coating on a fiber sheet layer containing 80 wt% of 7 μm carbon fibers and 20 wt% of 1.1 De low melting point polyethylene terephthalate, thermal calendering was carried out at a rate of 2 M / min under a pressure of 80 bar at 130 ° C. (High density).

Example 3 A fiber sheet layer containing 80 wt% of 7 μm carbon fibers and 20 wt% of 1.1 De low melting point polyethylene terephthalate was graphene-coated and densified, and then filled with nitrogen. The inside was filled with nitrogen, To 900 占 폚, and then maintained for 1 hour (carbonization).

Example 4: A fiber sheet layer containing 80 wt% of copper-plated carbon fibers and 20 wt% of 1.1De low melting point polyethylene terephthalate was graphene-coated.

Example 5 A fiber sheet layer containing 0.03De polyethylene terephthalate 30wt%, 0.1De polyethylene terephthalate 30wt%, and 1.1De low melting point polyethylene terephthalate 40wt% was coated with graphene and heated at 130 ° C and 80 bar , And subjected to thermal calendering treatment (densification) at a speed of 2 M / min under pressure conditions.

 Example 6: A fiber sheet layer containing 30 wt% of 0.06De polyethylene terephthalate, 30 wt% of 0.1De polyethylene terephthalate and 40 wt% of 1.1De low melting point polyethylene terephthalate was coated with graphene, and the inside was filled with nitrogen (Carbonization) after raising the temperature from room temperature to 900 占 폚 at a heating rate of 5 占 폚 / min and then maintaining the temperature for 1 hour.

Experimental Example 1: Specific heat, Thermal diffusivity , And thermal conductivity measurement

In order to investigate the specific heat, it was measured according to differential scanning calorimetry (DSC) and according to KS M ISO 11357-4 (Plastics-DSC-part 4: Determination of specific heat capacity) standard. DSC Q20 (purchased from TA Corporation) was used as the test equipment, and the mixture was maintained at 0 ° C for 5 minutes under an air flow filled with nitrogen gas, and then heated at 0 to 50 ° C for 1 hour at a rate of 5 ° C / min , And the specific heat was measured while keeping it at 50 DEG C for 5 minutes.

The thermal conductivity or the thermal diffusion coefficient is a concept proportional to the electric conductivity. The thermal conductivity of the conductive nonwoven fabric was examined. This is because, in the case of thermal conductivity or thermal diffusivity, since the measurement error ratio is smaller than the actual measurement value, the more accurate physical properties can be confirmed.

In order to investigate the thermal diffusivity and thermal conductivity, the test was conducted in accordance with ASTM E1461 (Standard Test Method for Thermal Diffusivity by the Flash Method). LFA 447 Nanoflash (purchased from NETZSCH) was used as a test device. calculates λ (Т) = α (Т ) ⅹC P (Т) ⅹρ (Т) ( thermal diffusivity (α), specific heat (C _P), density (ρ) thermal conductivity (λ), and then measured. The , The test temperature was 25 < 0 > C.

Analysis of the first embodiment of Table 1 shows that even when graphene coating is used as the conductive nanomaterial, the thermal conductivity is 38.597 (W / (mK)), and the conventional carbon fiber nonwoven fabric 0 to 20 (W / (mK))), it can be confirmed that the thermal conductivity is increased.

Further, when the fourth embodiment of Table 1 is analyzed, it can be confirmed that the thermal conductivity is 5.742 (W / (mK)) and the thermal conductivity is higher than that of the conventional carbon fiber nonwoven fabric. However, Low.

However, the thermal conductivities of the first and fourth embodiments and the second and third embodiments of Table 1 show a large difference. Although the second embodiment relates to a fiber sheet layer having the same blending ratio as that of the first embodiment, thermal carding treatment (densification) is performed at a rate of 2 M / min under a pressure condition of 80 bar at 130 캜 after Graphene coating The result is measured to be 80.093 (W / (mK)) which is at least twice as large as the first embodiment and 13 times or more as compared with the fourth embodiment.

In the case of the third embodiment of Table 1, even though the blending ratios of the first and third embodiments are the same as those of the fibrous sheet layer, the Graphene coating, the same thermal calendering treatment (densification) as in the second embodiment, After the filling, the temperature was raised from room temperature to 900 ° C under a temperature rise condition of 5 ° C / min and then maintained (carbonized) for 1 hour. As a result, it was 12 times or more as compared with the first embodiment, (W / (mK)), which is 80 times or more than that of Example 4, is measured.

Further, in the case of Examples 5 and 6 of Table 1, a conductive material is coated on a fiber sheet layer made of polyethylene terephthalate fiber not containing carbon fibers, followed by densification and carbonization treatment. Even when the conductive carbon fiber is not included in the combination in the wet process, the thermal conductivity is 31.370 (W / (mK)) when coated with a coating liquid containing a conductive material and then densified, (0 to 20 W / (mK)), which is not coated with 73.318 (W / (mK)).

Therefore, based on the contents of Table 1, when a heat treatment step is carried out, a conductive nonwoven fabric having a thermal conductivity higher than that of a sheet (nonwoven fabric) made of fibers including a conductive material as well as a conductive material is manufactured Can be confirmed.

In order to accomplish the above object, there is provided a method of manufacturing a nonwoven fabric, comprising the steps of: (d) densifying the nonwoven fabric; (d) carbonizing the nonwoven fabric; (C), which is a step of increasing the density of the conductive nanomaterial-coated nonwoven fabric.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included within the scope of the present invention.

Claims (12)

A fibrous sheet layer;
And a coating layer disposed on an upper surface or a lower surface of the fibrous sheet layer and including a conductive material,
Wherein the mass ratio of the fibrous sheet layer to the coating layer is from 1:10 to 10: 1,
The total thickness of the fibrous sheet layer and the coating layer is 0.01 mm to 1 mm,
The total weight including the fibrous sheet layer and the coating layer is 15 gsm to 200 gsm, the fibrous sheet layer to which the coating layer is bonded is heat-
Wherein the coating layer further comprises a metal,
Wherein the metal comprises 7 wt% to 35 wt% of the total weight of the coating layer,
The heat treatment is a step of densifying the fiber sheet layer to which the coating layer is bonded and then carbonizing or densifying the fiber sheet layer after carbonization,
Wherein the carbonizing step comprises heating the fiber sheet layer to which the coating layer is bonded to 600 to 1000 占 폚 at a heating rate of 1 占 폚 / min to 10 占 폚 / min under an air flow condition including an inert gas, Wherein the heated fibrous sheet layer is maintained at 600 캜 to 1000 캜 for 5 hours to 15 hours.
The method according to claim 1,
Wherein the fibrous sheet layer further comprises carbon fibers.
The method according to claim 1,
Wherein the conductive nonwoven fabric has a thermal conductivity of 10 (W / (mK)) to 500 (W / (mK)).
The method according to claim 1,
The conductive material is preferably a carbon-based compound selected from the group consisting of graphene, graphite, carbon, carbon nanotubes, carbon black, and metal- Wherein the conductive nonwoven fabric is at least one selected from the group consisting of polyethylene terephthalate and polypropylene.
5. The method of claim 4,
Wherein the thickness of the graphene is 5 nm to 100 nm.
delete Wet laid a first formulation comprising the cut fibers to form a fibrous sheet layer;
Coating a coating liquid containing a conductive material on the upper or lower surface of the fibrous sheet layer to form a coating layer;
Drying the coating layer; And
And heat treating the fiber sheet layer to which the coating layer is bonded,
Wherein the mass ratio of the fibrous sheet layer to the coating layer is from 1:10 to 10: 1,
The total thickness of the fibrous sheet layer and the coating layer is 0.01 mm to 1 mm,
Wherein the total weight of the fibrous sheet layer and the coating layer is 15 gsm to 200 gsm,
Wherein the heat treatment comprises:
A step of densifying the fiber sheet layer to which the coating layer is bonded and then carbonizing or densifying the fiber sheet layer after carbonization,
Wherein the carbonizing step comprises heating the fiber sheet layer to which the coating layer is bonded to 600 to 1000 占 폚 at a heating rate of 1 (占 폚 / min) to 10 (占 폚 / min) under an air flow condition including an inert gas, Wherein the heated fibrous sheet layer is maintained at 600 캜 to 1000 캜 for 5 hours to 15 hours.
8. The method of claim 7,
≪ / RTI > wherein the first formulation further comprises carbon fibers.
delete 8. The method of claim 7,
Wherein the densifying step is performed by thermal calendering or hot plate pressing.
delete A conductive nonwoven fabric produced by the method of claim 7.

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