KR101420051B1 - manufaturing method of carbon nano ink for heat dissipation, and surface activation of coating layer thereof - Google Patents

Abstract

The present invention relates to a method of manufacturing carbon nanoink capable of being coated onto metal, ceramic, polymer, and glass used for radiation of heat and a method of activating the surface of a carbon nanocoating layer. The method of manufacturing carbon nanoink includes: a step of providing a length-controlled characteristic controlling-type carbon nanomaterial and a fused-type carbon nanomaterial in which a linear carbon nanomaterial are combined to grapheme; and a step of dispersing the characteristic controlling-type carbon nanomaterial and the fused-type carbon nanomaterial separately or as a mixture together with a dispersant into a solvent. The method of activating the surface of a carbon nanocoating layer includes: a step of forming a carbon nanocoating lyer by coating and hardening a product with carbon nanoink; and a step of exposing the front end of a carbon nanomaterial from the carbon nanocoating layer. The step of exposing the front end of the carbon nanomaterial can be performed by taping or dipping into a solvent. According to the carbon nanoink given in the present invention, by improving dispersibility by using the characterisc controlling-type carbon nanomaterial, it is possible to improve the heat radiation performance of the coating layer, and by using the fused-type carbon nanomaterial separately or together with the characterisc controlling-type carbon nanomaterial, it is possible to improve the heat radiation performance of the carbon nanomaterial in the vertical direction and in the horizontal direction. Furthermore, through the surface activation process of expositing the carbon nanomaterial from the coating layer formed using the carbon nanoink, the heat radiation performance of the coating layer can be enhanced.

Description

[0001] The present invention relates to a method for manufacturing a carbon nano ink for heat dissipation and a surface activation method for a carbon nano ink coating layer,

The present invention relates to a method for preparing a carbon nano-ink using a carbon nanomaterial and a method for activating the surface of the carbon nano-coating layer. More particularly, the present invention relates to a method for manufacturing a carbon nano ink which can be coated on metals, ceramics, And a surface activation method of the carbon nano-coating layer.

In general, for heat dissipation of parts, there are two methods: 1) to make the parts themselves with excellent heat dissipation; 2) to improve the structure to increase the surface area for heat dissipation of parts; and 3) It can be divided into methods. Previously, the methods 1) and 2) were mainly used, but recently, many studies and commercialization of coating methods using carbon nano materials having excellent heat dissipation have been attempted.

On the other hand, in case of carbon nanotubes such as carbon nanotubes and carbon nanofibers, the diameter is usually several to several tens of nanometers, the length is several tens of micrometers, and the ratio of the length to the diameter is 10 to 10,000. . Since these carbon nanomaterials are synthesized in a tangled structure like a thread in the synthesis step, it is difficult to disperse carbon nanomaterials in the liquid phase and the solid phase, and this phenomenon is further exacerbated in the coating layer.

In the case of fibrous carbon nanomaterials, the heat released to the atmosphere is smooth if there is a tip exposed to the atmosphere. If not, the heat generated from the material is transferred through the carbon nanomaterial forming the net structure, , The heat accumulation phenomenon occurs, and the carbon nanomaterial is an excellent heat radiating material, the heat radiating effect is not exhibited. Therefore, in order to improve the heat radiation effect of the coating layer, it is necessary to uniformly coat the carbon nanomaterial and activate the surface of the coating layer so that the tip of the carbon nanomaterial is exposed to the atmosphere outside the coating layer. In this case, as the length of the carbon nanomaterial is controlled to be shorter than that of the conventional carbon nanomaterial, the tip of the carbon nanomaterial can easily be exposed to the atmosphere, thereby increasing the heat radiation effect.

Background Art [ 0002 ] As a prior art relating to the control of carbon nanomaterial length, there is known a method of treating carbon nanostructure using wet milling (Korean Patent Application No. 10-2003-0039657), " Manufacturing of conductive inkjet ink using conductive polymer 10-2004-009153 ")," Device for controlling the length of carbon nanotubes by electrolytic action (Korean Patent Registration No. 10-0563251) ", and the " length- Fiber, control method and apparatus thereof, composite material using length-controlled nanofiber (Korea Patent No. 10-1024169) ".

Background Art [0002] Prior art related to the production of carbon nano-ink using a carbon nanomaterial is disclosed in " Dispersant for Carbon Nanotubes and Composition Containing the Same (Korea Patent No. 10-0815028) "," Conductive Ink and Conductive Substrate (PCT International Application No. PCT / EP2007 / 008193) ", and most of these dispersants and dispersing processes are disclosed in Korean Patent Application No. 10-2009-7013061, And a combination of these methods.

In the meantime, for the production of nano ink capable of controlling the length of nanofiber and improving dispersibility and heat dissipation, "Nanofiber ink, manufacturing method thereof, and heat shield and heating element using the same 10-120719, November 26, 2012).

Prior art relating to the surface activation treatment of the carbon nano ink coating layer is disclosed in " A method of manufacturing an electron emission source using a one-component carbon nanotube binder mixture solution and a carbon nanotube electron emission source for a field emission device (Korean Patent No. 10- 0977410 ")," Carbon Nanotube-Aqueous Polymer Composite Solution Composition, Method for Manufacturing Field Emission Sources Using the Same, and Flexible Field Emission Device (Korean Patent No. 10-1163733) A method of forming a wiring of a semiconductor element and a semiconductor element manufactured by the method (Korean Patent Registration No. 10-0982419) ". Among the above prior arts, Korean Patent No. 10-0977410 and Korean Patent No. 10-1163733 After coating carbon nanotubes on the surface, the surface is activated by taping using an adhesive tape and then used as a field emission device Korean Patent No. 10-0982419 discloses a method for surface activation by forming a catalytic metal layer on the electrode surface and then synthesizing carbon nanotubes, And aims to improve the electron emission property and the electric conductivity by using nanotubes.

Numerous technologies are being developed to develop a coating solution using graphene, which is known to have excellent heat dissipation properties. Examples of the known prior arts include a heat radiation composition and a heat radiation product using the same (Korean Patent Laid-Open No. 10-2012-0107403), a case of a portable terminal having an electromagnetic wave shielding and heat radiation function (Korean Utility Model Registration No. 20-0460259) A method of producing a stable dispersion solution of graphene and a reduced graphene dispersion solution (Korean Patent Laid-Open Publication No. 10-2012-0039799) produced thereby, an insulated wire including a graphene coating layer (Korean Patent Laid-Open No. 10-2012-0137844) have. In this technique, nano-carbon is simply used as a heat dissipation material (10-2012-0107403), inserting a graphene film between layers to improve heat dissipation (20-0460259), or a dispersion solution of reduced graphene alone (10-2012-0039799), and a method of forming a coating layer by a method of synthesizing graphene on a metal surface (10-2012-0137844). Since most of these prior art techniques are directed to graphene and graphene is a flat plate-like structure, horizontal heat dissipation is smooth, but vertical heat dissipation is limited.

An object of the present invention is to provide a carbon nano ink having excellent heat radiation performance and a method of activating a surface of a coating layer coated with such a carbon nano ink.

The gist of the present invention to achieve the above object is as follows.

(1) providing a carbon nanomaterial having a controlled length of 1 to 3 占 퐉 and a fused carbon nanomaterial having a linear carbon nanomaterial bonded to graphene; The step of dispersing the above-described steric control type carbon nanomaterial and the fused carbon nano material in a solvent together with a dispersant corresponding to 0.5 to 2 times the concentration of the carbon nanomaterial, or a mixture thereof in an amount of 0.1 to 20 wt% Wherein said carbon nanofibers have a thickness of 10 to 100 nm.

(2) The method for producing a carbon nano ink for heat dissipation according to (1), wherein the steric control type carbon nanomaterial is a carbon nanotube or carbon nanofiber having a diameter of 200 nm or less.

(3) The method for providing the above-described shape control type carbon nanomaterial includes: charging a linear carbon nanomaterial and a crushed rough material into a ball milling apparatus; Mixing the charge at low speed; Rotating the mixed charge at a high speed to cut linear carbon nanomaterials using the impact energy of the balls; And recovering the carbon nanomaterial having a controlled length by using a sieve. The method for manufacturing a carbon nano ink for heat dissipation according to (1) above,

(4) providing the fusion carbon nanomaterial includes: charging graphene and carbon nanomaterial into a ball milling apparatus; Mixing the charge at low speed; A method of manufacturing a carbon nano ink for heat dissipation according to the above (1), comprising the step of causing a linear carbon nanomaterial to be dispersed in a planar graphene layer together with layer separation of graphene at high speed.

(5) The fusion carbon nanomaterial is provided by mixing the solvent with a graphene and a carbon nanomaterial, mechanically milling the mixture, and dispersing the carbon nanomaterial by ultrasonic waves. For producing a carbon nano ink.

(6) The method for producing a carbon nano ink for heat radiation according to (1), wherein the dispersant is at least one selected from Triton-X, CMC, PVB, PAB or EAB.

(7) The method for producing carbon nano ink for heat radiation according to (1), wherein the solvent is at least one selected from distilled water, alcohol, DMF, MEK and polyol.

(8) The dispersing step may be carried out by ultrasonic, roll milling, ball milling, jet milling, screw mixing, or attrition milling. (1). The method for manufacturing a carbon nano ink for heat dissipation according to the above (1), wherein the step

(9) coating and curing the carbon nanoink according to any one of (1) to (8) above to form a carbon nano-coating layer; And exposing the tip of the carbon nanomaterial from the carbon nano-coating layer.

(10) The method for activating carbon nanotubes for radiating heat according to (9), wherein the coating process is performed by any one of spray coating method, doctor blade method, screen printing method and deposition method.

(11) The method for activating a carbon nanocoagulation layer for heat radiation according to (9), wherein the curing process is performed by a thermal curing or ultraviolet curing method.

(12) The method for activating carbon nanotubes for radiating heat according to (9), wherein the step of exposing the carbon nanomaterial to the tip is performed by taping or dipping in a solvent.

(13) The method according to (12) above, wherein the solvent used in the tip exposing step is the same solvent as the solvent used for preparing the carbon nano ink so as to remove the solvent coated on the surface of the carbon nanomaterial. A method for activating a carbon nano-coating layer for heat radiation.

According to the carbon nano ink according to the present invention, the dispersibility can be improved by using the carbon nanomaterial of which the length of the carbon nano material is controlled, thereby improving the heat radiation of the coating layer. In addition, by using a fusion-type carbon nano material that structurally couples a linear carbon nano material with graphene, either alone or in combination with the above-described control-type carbon nanomaterial, both the horizontal and vertical heat dissipation properties of the carbon nanomaterial, Can be improved.

Meanwhile, the heat radiation performance of the coating layer can be improved through the surface activation process of exposing the carbon nanomaterial to the outside from the coating layer formed using the carbon nano ink.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a whole flow diagram of a method for manufacturing a carbon nano ink for heat radiation according to the present invention and a method for activating a surface of a coating layer using the same.
FIGS. 2 to 4 are flow charts of a method for manufacturing a control-type carbon nanomaterial according to the present invention, and a photograph of a structure of carbon nanomaterials before and after the control of a constituent phase.
FIGS. 5 to 7 are flow charts of a method for producing a fused carbon nanomaterial according to the present invention, and a tissue photograph of a fused carbon nanomaterial obtained by a wet process and a dry process.
8 is a flow chart of a method of manufacturing a carbon nanomaterial ink for heat radiation according to the present invention.
9 is a schematic view of the carbon nanocoagulated layer according to the present invention before and after the surface activation treatment.
10 is a graph showing the heat dissipation characteristics of a carbon nano-coating layer surface-activated according to the present invention, in comparison with a conventional method.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. On the other hand, throughout the specification, when an element is referred to as "including" an element, it means that it can include other elements as well, without excluding other elements, unless specifically stated otherwise.

FIG. 1 is a flowchart illustrating a method for manufacturing a carbon nano ink according to the present invention and a method for activating a surface of a coating layer using the method. FIG. 8 is a flowchart illustrating a method for manufacturing a carbon nanomaterial for heat radiation according to the present invention.

First, as shown in FIGS. 1 and 8, a method for manufacturing a carbon nano ink for radiating heat according to the present invention includes steps 100 and 200 for providing a carbon nanomaterial and a fused carbon nanomaterial, ; And dispersing (300) the above-described control-type carbon nanomaterial and the fused carbon nanomaterial alone or in a mixture thereof with a dispersant in a solvent.

Means that the length of the carbon nanotubes or carbon nanofibers having a diameter of 200 nm or less is controlled to 1 to 3 占 퐉 in terms of the dispersibility of the carbon nanomaterial in the ink, The end of the carbon nanomaterial is easily exposed to the atmosphere, thereby improving heat dissipation of the coating layer.

FIG. 2 is a flowchart illustrating a method of manufacturing a control-type carbon nanomaterial according to the present invention. The method may be manufactured by the method disclosed in Korean Patent No. 10-1024169 filed by the inventor of the present invention, 1024169 is incorporated in the present invention by itself. Specifically, a linear carbon nanomaterial and a crushed rough material are loaded into a ball milling apparatus having a cooling device and a gas control device (S110), a step of mixing the charged material at a low speed (S120) (S130) cutting the linear carbon nanomaterial using the impact energy of the ball by rotating the ball at a high speed (S130), and recovering the carbon nanomaterial by separating the carbon nanomaterial and the ball whose length is controlled by using a sieve Step S140. Figs. 3 and 4 show a photograph of a tissue for each carbon nanomaterial before and after the constriction control.

The fused carbon nanomaterial refers to a carbon nanomaterial having a structure in which a linear carbon nanomaterial is bonded to graphene. When the carbon nanomaterial is used alone or in combination with the control nanomaterial, the carbon nanomaterial, which is a heat dissipation medium, It also plays a role of improving heat dissipation in vertical direction as well as heat dissipation. Specifically, since graphene, which is known to have excellent heat dissipation, has a planar structure, the thermal conductivity in the horizontal direction is excellent, but the thermal conductivity in the vertical direction (depth direction) is not good. Therefore, in the present invention, linear carbon nanomaterial So as to compensate for the heat dissipation in the vertical direction.

FIG. 5 is a flow chart of a method for fabricating a fusion type carbon nanomaterial according to the present invention. In this fusion type carbon nanomaterial, a linear carbon nanomaterial and planar graphene are prepared (S210), followed by a dry process (S220) And the fusion carbon nanomaterial is recovered (S240) through a wet process (S230). The drying step (S220) includes the step (S221) of charging the graphene and the carbon nanomaterial into a ball milling apparatus; Mixing the charge at low speed (S222); And a step (S223) of causing the linear carbon nanomaterial to be dispersed between planar graphene layers together with layer separation of graphene at high speed. The wet process S230 may include a step S232 of mechanically milling the graphene and a carbon nano material (S231) and a step of finely mixing the graphene and the carbon nanomaterial (S232) And a step (S233) of inserting and dispersing the carbon nanomaterial between the layer separation and the graphene layer. The solvent used in the wet process may be distilled water, alcohol, organic solvent (Methyl ethyl ketone), DMF (Dimethyl formamide), Polyol, Silicon) or the like which is used in the production of conventional liquid carbon nanomaterials. 6 and 7 show a photograph of the structure of each of the fusion-type carbon nanomaterials obtained by the wet process and the dry process.

Referring to FIG. 8, the steric controlled carbon nanomaterial and the fused carbon nanomaterial produced in this manner, alone or in combination, are mixed with a dispersant in a solvent (100, 200) and dispersed in a solvent together with the dispersant Thereby producing a carbon nano material for heat radiation (300). The dispersing process includes a step 311 of adjusting the initial dispersion and viscosity in the milling process and finally a step 312 of manufacturing the mixture to suit the application in the ultrasonic dispersion process. The dispersion process may be any one selected from ultrasonic, roll milling, ball milling, jet milling, screw mixing, or attrition milling. May be performed in one or more ways.

In this case, the heat dissipation property depends on the dispersibility and structure of the carbon nanomaterial mixed in the ink. In view of the improvement of the dispersibility, the higher the content of the control-type carbon nanomaterial is, the better the heat dissipation due to the structure of the nanomaterial The higher the content of the fusion carbon nanomaterial, the more favorable the heat dissipation performance can be attained by using the control type carbon nanomaterial and the fusion type carbon nanomaterial alone. However, Effect can be expected.

It is preferable that the amount of the property-controlled carbon nanomaterial and the fused carbon nanomaterial contained in the solvent or the mixture thereof is in the range of 0.1 to 20 wt% with respect to the solvent. 0.1 wt. , It is difficult to expect a desired heat radiation performance. When it exceeds 20 wt%, the concentration of carbon or material is high and it is difficult to form a coating layer, which is not preferable.

The ink solvent may be any one or more selected from distilled water, alcohol, DMF, MEK, and polyol, and is not particularly limited.

The dispersing agent may be at least one selected from Triton-X, Carboxy methyl cellulose (CMC), Poly vinyl butyral (PVB), Poly butyl acetate (PAB), Cellulose acetate butyrate ester (EAB) It is preferably in the range of 0.5 to 2 times the content. If it is less than 0.5 times, re-agglomeration phenomenon of carbon nanomaterial occurs over time, and if it is more than 2 times, the content of dispersant attached to the surface of carbon nanomaterial increases, resulting in lower heat dissipation.

On the other hand, as shown in FIG. 10, since the carbon nano material ink according to the present invention has excellent dispersibility, it is easy to select the additive to be added as a dispersing assistant function and to minimize the addition amount thereof, thereby improving the thermal conductivity And can be expected to be competitive in terms of the price of carbon nanomaterial and the productivity of carbon nano ink.

Next, the surface activation method of the coating layer using the carbon nano ink according to the present invention will be described.

Referring to FIG. 1, the surface activation method includes: (400) forming a carbon nano-coating layer by coating and curing the carbon nano-ink produced according to the present invention on a metal, ceramics, glass, and polymeric products; And exposing the carbon nanomaterial to the atmosphere using a solvent immersion method (600) in which the tip of the carbon nanomaterial is dipped in a taping method (500) or a solvent to remove a dispersant / binder. In this case, it is preferable that the solvent used for the tip exposure of the carbon nanomaterial is of the same type as the solvent used in the production of the carbon nano ink so as to remove the solvent coated on the surface of the carbon nanomaterial.

The carbon nano ink may be coated by any one of spray coating method, doctor blade method, screen printing method, and deposition method. The curing step may be performed by a thermal curing method or an ultraviolet curing method, The thermal conductivity of the heat-radiating coating layer can be controlled by the coating thickness and the content of the carbon nanomaterial.

( Example )

The controllable type carbon nanomaterial according to the present invention was manufactured using the method described in detail in Korean Patent Laid-Open No. 10-2010-0018787. The linear carbon nanomaterial was subjected to the addition effect of crushed coarse material and balls, Table 1 shows the changes in the shape and length of the carbon nanomaterials depending on the influence of the gas supply device, the milling time and the number of revolutions to determine the mechanical energy. When a length control method of the carbon nanomaterial according to the present invention is applied, it is possible to obtain a carbon nano material of high quality having a length of 1 to 3 탆, and control of the length of the other carbon nanomaterial can be controlled by changing the condition .

division Shredding
Crude substance Cooling device Gas atmosphere Milling time
(minute) Revolutions
(RPM) CNT
Appearance CNT length (탆) Impact of crushed material use behavior nitrogen 10 400 O 1-3 unused behavior nitrogen 10 400 X 1-5 Cooling device
effect use behavior nitrogen 10 400 O 1-3 use Not operating nitrogen 10 400 X 1-4 atmosphere
effect use behavior nitrogen 10 400 O 1-3 use behavior Waiting 10 400 X 1-3 Effect of milling time use behavior nitrogen 60 400 X 1 or less use behavior nitrogen 30 400 △ 1 or less use behavior nitrogen 10 400 O 1-3 Revolutions
effect use behavior nitrogen 10 200 X 1 to 8 use behavior nitrogen 10 300 △ 1-5 use behavior nitrogen 10 400 O 1-3 use behavior nitrogen 10 500 X 1 or less

* Carbon nanotube properties: O uniform purity and surface, △ intermediate, X purity and surface defects

The fused carbon nanomaterials according to the present invention were prepared by a dry process and a wet process. In the case of the dry process, the graphene and carbon nanomaterial are mixed in a ratio of 1: 1, then charged into a milling container (Jar) together with a stainless steel ball, uniformly mixed for 1 to 120 minutes at a low speed of 100 to 200 rpm or less, At a high speed of 400 rpm, applying a superimposed energy for 1 to 300 minutes causes the linear carbon nanomaterial to be dispersed between planar graphene layers. In case of the wet process, graphene and carbon nanomaterial are put into distilled water, alcohol and organic solvent and mixed uniformly at 100 to 500 rpm for 1 to 300 minutes, preferably 100 rpm for 60 minutes by mechanical milling method, Type dispersing machine for 10 to 180 minutes to prepare a fused carbon nanomaterial having a carbon nanomaterial inserted and dispersed between the graphene layer separation and the graphene packing.

division Time (minutes) RPM Fusion Dry method mix Less than 1 Less than 100 X 1 to 120 100 to 200 O Above 120 Above 200 △ fusion 1 or less Less than 200 X 1 to 300 200 to 400 O More than 300 More than 400 X Wet method Mechanical milling Less than 1 Less than 100 X 1 to 300 100 to 500 O More than 300 Above 500 X ultrasonic wave Less than 10 - X 10 to 180 - O Above 180 - △

On the other hand, it can be seen from the photographs of FIGS. 6 and 7 that the wet method is more uniform and efficient than the dry method in the fusion of graphene and carbon nanomaterial.

The controlled carbon nanomaterial and the fused carbon nanomaterial are mixed in a ratio of 50:50 by weight or in a weight ratio, and charged into distilled water, alcohol, or organic solvent. The concentration of the carbon nanomaterial is maximized to 20 wt.%. These mixtures were mixed in a ball milling process for up to 5 hours while controlling the viscosity. Ultrasonic processes were used to finally disperse the carbon nanomaterials to prepare inks. The above conditions were summarized in Table 3 below.

division Contents Carbon nanomaterial type Length control, unified carbon nanomaterial,
Length control + fusion type (ratio 50:50) Types of solvents Distilled water, ethyl alcohol, organic solvent Dispersant CMC, PVB, EAB Carbon nanomaterial concentration (wt.%) 20 wt.% Or less Dispersion method Mechanical milling, ultrasonic

Spray coating method was applied for the coating of carbon nano ink. Curing conditions were as follows: distilled water, alcohol type carbon nano ink, and UV curing method were used. At this time, the heat radiation characteristics of the coating film can be controlled by controlling the coating thickness and the concentration of the carbon nanomaterial.

9 is a schematic view of the carbon nanocoagulated layer according to the present invention before and after the surface activation treatment. As shown in FIG. 9, in the case of the coating layer coated by the conventional method, there is almost no carbon nanomaterial exposed to the surface of the coating layer before surface activation. But the binder and the dispersant covering the carbon nanomaterial are washed out to expose the surface of the coating layer by inducing exposure of the carbon nanomaterial by taping as in the present invention or by immersing the surface of the coating layer in a solvent By applying this method, heat dissipation could be facilitated.

Table 4 shows the results of measurement of the thermal resistance before and after the surface activation of the conventional carbon nano ink coating layer and the heat-dissipating carbon nano ink coating layer according to the present invention. In all the coating layers to which various kinds of carbon nano materials were applied, It was confirmed that the thermal resistance of the carbon nano ink coating layer according to the present invention was reduced, that is, the heat radiation performance was improved, and that the heat radiation performance after surface activation could be significantly improved.

Kinds Surface activation treatment Thermal Resistance (K / W) ranking Conventional carbon nanomaterials X 2.12 8 O 1.89 5 Length controlled carbon nanomaterial X 1.92 7 O 1.82 3 Fusion type carbon nanomaterial X 1.91 6 O 1.80 2 Length controlled carbon nanomaterial
+ Fusion carbon nanomaterials X 1.85 4 O 1.78 One

Claims (13)

(a) providing a carbon nanomaterial having a controlled length of 1 to 3 占 퐉 and a fused carbon nanomaterial having a linear carbon nanomaterial bonded to graphene; (b) dispersing the above-mentioned control-type carbon nanomaterial and the fused carbon nanomaterial alone or a mixture thereof in a solvent in a concentration of 0.5 to 2 times the concentration of the carbon nanomaterial in a solvent in an amount of 0.1 to 20 wt% Including,
The provision of the fusion type carbon nanomaterial can be achieved by,
Charging a ball milling apparatus with a linear carbon nanomaterial with graphene; Mixing the charge at low speed; Allowing the linear carbon nanomaterial to be distributed between planar graphene layers with layer separation of graphene at high speed,
A step of mechanically milling a mixture of graphene and a linear carbon nanomaterial in a solvent, and dispersing the carbon nanomaterial by ultrasonic waves.
The method according to claim 1,
Wherein the steric control type carbon nanomaterial is a carbon nanotube or carbon nanofiber having a diameter of 200 nm or less.
2. The method of claim 1, wherein providing the controlled-
Charging a linear carbon nanomaterial and a crushed rough material into a ball milling apparatus; Mixing the charge at low speed; Rotating the mixed charge at a high speed to cut linear carbon nanomaterials using the impact energy of the balls; And recovering the carbon nanomaterial having a controlled length by using a sieve.
delete delete The method according to claim 1,
Wherein the dispersant is at least one selected from the group consisting of Carboxy methyl cellulose (CMC), Poly vinyl butyrate (PVB), Poly butyl acetate (PAB), and Cellulose acetate butyrate ester (EAB).
The method according to claim 1,
Wherein the solvent is at least one selected from distilled water, alcohol, dimethyl formamide (DMF), methyl ethyl ketone (MEK), and polyol.
The method according to claim 1,
The dispersing step of the step (b) may be carried out by ultrasonics, roll milling, ball milling, jet milling, screw mixing, or attrition milling ). ≪ Desc / Clms Page number 24 >
Coating and curing the carbon nano ink produced according to any one of claims 1 to 6 and 8 to form a carbon nano-coating layer;
And exposing the tip of the carbon nanomaterial from the carbon nano-coating layer.
The method of claim 9, wherein the coating is performed by any one of spray coating, doctor blade coating, screen printing, and dipping.
10. The method of claim 9, wherein the curing process is performed by a thermal curing or ultraviolet curing method.
The method of claim 9, wherein the step of exposing the carbon nanomaterial to the tip is performed by taping or immersion in a solvent.
[14] The method of claim 12, wherein the solvent used in the tip exposing step is the same solvent as the solvent used to prepare the carbon nano ink to remove the solvent coated on the carbon nanomaterial surface, A method of activating a coating layer.

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