WO2015020280A1

WO2015020280A1 - Carbon nanotube dispersion and production method for same

Info

Publication number: WO2015020280A1
Application number: PCT/KR2013/011533
Authority: WO
Inventors: 김용태; 김병열; 안성희; 김중인
Original assignee: 제일모직 주식회사
Priority date: 2013-08-05
Filing date: 2013-12-12
Publication date: 2015-02-12
Also published as: KR20150016852A

Abstract

The carbon nanotube dispersion of the present invention comprises: carbon nanotubes of which the D99 value of the particle size distribution is between about 0.5 and about 50 μm; nitrile rubber; and a solvent. In the carbon nanotube dispersion, the carbon nanotubes are uniformly dispersed in the solvent in an economic fashion.

Description

【Specification】

[Name of invention]

Carbon nanotube dispersion and its manufacturing method [technical field]

The present invention relates to a carbon nanotube dispersion and a preparation method thereof. More specifically, the present invention relates to a carbon nanotube dispersion in which carbon nanotubes are uniformly dispersed in a solvent by applying carbon nanorubber and nitrile rubber of a specific size, and a method of manufacturing the same.

Background Art

Carbon nanotubes have a graphite sheet having a nano-size diameter in the form of a cylinder, and have a sp ² bond structure. The graphite surface exhibits characteristics of a conductor or a semiconductor depending on the angle and structure of the graphite surface. In addition, depending on the number of bonds in the wall, single-walled carbon nanotubes (SWCNTs), double-walled carbon nanotubes (DWCNTs) and multi-walled carbon nanotubes (MWCNTs) carbon nanotubes, and rope carbon nanotubes. In particular, single-walled carbon nanotubes have a variety of metallic and semiconducting properties and thus exhibit a variety of electrical, chemical, physical and optical properties. These characteristics can be used to implement more detailed and integrated devices. Applications of carbon nanotubes currently under investigation include transparent electrodes, electrostatic dispersion films, field emission devices, surface heating elements, optoelectronics devices, various sensors, and transistors.

However, in spite of the usefulness of such carbon nanotubes, the use of carbon nanotubes is limited due to low solubility and low dispersibility. That is, the carbon nanotubes do not form a stable dispersion state in the aqueous solution due to the strong van der Waals attraction between each other, there is a problem that agglomeration phenomenon occurs.

In order to solve this problem, researches on functional vaporization to modify the surface of the carbon nanotubes and impart functionalities have been made, and one example thereof is noncovalent functionalization of carbon nanoleubs. Non-covalent functional vaporization of carbon nanotubes means hydrogen bonds, van der Waals bonds, charge transfer, dipole one dipole interaction, π-electron interaction (π- Non-covalent bonds, such as π stacking interaction, to bond the material to be modified on the surface of the carbon nanotubes How to give W. Non-covalent functionalization has the advantage that it is not necessary to induce defects in the structure of the carbon nanotubes, so that the functional group can be given while maintaining the inherent properties of the tube. Non-covalent functionalization is usually done using surfactants, aromatic hydrocarbons, biomaterials, etc., and most of them disperse carbon nanotubes stably in aqueous solution. The method using such an aromatic hydrocarbon dispersant is one of the most studied among the non-covalent functionalization of the carbon nanotubes. The carbon nanotube wall has a hexagonal graphite structure and can interact with electrons with molecules (dispersants) made of aromatic hydrocarbons such as conjugated polymers.

The conjugated polymer having an aromatic ring in the polymer chain interacts with π electrons with the nanotube wall and undergoes functionalization by wrapping the nanotube. Such conjugated polymers include PmPV (poly (metaphenyIene vinylene)), PAE (poly (aryleneethynylene)), PPvPV (poly {(2,6-pyridinylenevinylene) -co-[(2,5-dioctyloxy-p-phenylene) vinylene] }), Poly (methyl methacrylate) (PMMA), Poly (5-alkoxym-phenylenevinylene) (PAmPV), Poly (p-phenylenevinylene) (PPV), cisoidal PPA (Polyphenylacetylene), and transoidal PPA are known.

However, since the conjugated polymer dispersing agent usually used in the dispersion method (non-covalent functionalization method) of carbon nanotubes is expensive, the dispersion method of carbon nanotubes using an inexpensive compound (stabilizer) is required.

[Detailed Description of the Invention]

[Technical problem]

An object of the present invention is to provide a carbon nanotube dispersion and a method for producing the same that can be uniformly dispersed in a carbon nanotube solvent.

Another object of the present invention is to provide a carbon nanotube dispersion and a method for producing the same, which can economically disperse carbon nanotubes.

Still another object of the present invention is to provide an electronic material manufactured using the carbon nano-leuubric dispersion.

The above and other objects of the present invention can be achieved by the present invention described below.

Technical Solution One aspect of the invention relates to a carbon nanotube dispersion. The carbon nanotube dispersion may include carbon nanotubes having a D99 value of about 0.5 to about 50 in a particle size distribution; Nitrile rubber; And a solvent; characterized in that it comprises a.

In embodiments, the content of the total solute including the carbon nano-rubber and the nitrile rubber is about 1 to about 15% by weight, the content of the solvent is about 85 to about 99% by weight, and in the total solute, the carbon The content of the nanotubes may be about 50 to about 90% by weight, and the content of the nitrile rubber may be about 10 to about 50% by weight.

In embodiments, the carbon nanotubes may include one or more of single-walled carbon nanotubes, double-walled carbon nanotubes, multi-walled carbon nanotubes, and bundled carbon nanotubes.

In embodiments, the nitrile rubber may include at least one of a nitrile rubber including a repeating unit represented by Formula 1, and a hydrogenated nitrile rubber (HNBR) including a repeating unit represented by Formula 2 below. :

In Chemical Formulas 1 and 2, m and n are each independently 50 to 250.

In embodiments, the nitrile rubber may have an increased average molecular weight of about 5,000 to about 50,000 g / mol.

In embodiments, the solvent may include one or more of an organic solvent containing a nitrogen atom (N) having an unshared electron pair, and an alcohol having 1 to 4 carbon atoms.

In embodiments, the carbon nanotube dispersion may further comprise a stabilizer comprising at least one of polyvinylidene fluoride (PVDF), polyvinylpyridone (PVP), and diisopropylamine (DIPA). .

Another aspect of the present invention relates to a method for producing a carbon nano-leuco dispersion. The production method is a carbon nanotube slurry by mixing and adjusting the carbon nanotubes and the solvent so that the D99 value of the particle size distribution of the carbon nano-rubber is about 0.5 to about 50; And mixing nitrile rubber in the carbon nano-leuub slurry; Steps.

In embodiments, the total solute content including the carbon nanotubes and the nitrile rubber is about 1 to about 15% by weight, and the content of the solvent is about 85 to about 99 W wt%, the total solute, the carbon nanotube content is about 50 to about 90% by weight, the content of the nitrile rubber may be about 10 to about 50% by weight.

In an embodiment, in the preparation of the carbon nanotube slurry, the mixing and particle size control may be performed by a dispersion method including one or more ultrasonic treatment and milling.

In embodiments, stabilizers comprising at least one of polyvinylidene fluoride (PVDF), polyvinylpyrrolidone (PVP), and diisopropylamine (DIPA) together with the nitrile rubber may be more mixed.

Another aspect of the invention relates to an electronic material. The electronic material is prepared using the carbon nanotube dispersion.

In an embodiment, the electronic material may be a positive electrode or a negative electrode of a secondary battery.

Advantageous Effects

The present invention provides a carbon nanotube dispersion in which carbon nanotubes are uniformly dispersed in a solvent and a manufacturing method thereof, and has an effect of providing an electronic material manufactured using the carbon nanotube dispersion.

[Brief Description of Drawings]

1 is a carbon nanotube dispersion prepared according to Examples 1 to 6 of the present invention

After diluting 2,000 times with NMP solvent, centrifuging at 3,000 rpm for 30 minutes, the supernatant was aliquoted and left for 24 hours.

Figure 2 is a carbon nano dispersion dispersion prepared according to Comparative Examples 1 to 3 of the present invention

After diluting 2,000 times with NMP solvent, centrifuging at 3,000 rpm for 30 minutes, the supernatant was aliquoted and left for 24 hours. [Best form for implementation of the invention]

Hereinafter, the present invention will be described in detail.

The carbon nanotube dispersion according to the present invention is characterized by comprising (A) carbon nanotubes having a D99 value of about 0.5 to about 50 in particle size distribution, (B) nitrile rubber, and (C) solvent.

(A) Carbon Nanotubes

Carbon nanotubes (CNT) used in the present invention are, for example, single-walled carbon nanotube (SWCNT), double-walled carbon nanotube (DWCNT), multi-wall Carbon Nanotubes (MWCNT; multi— walled carbon nanotubes, rope carbon nanotubes, and combinations thereof, characterized in that the D99 value of the particle size distribution is about 0.5 to about 50 urn, for example, about 5 to about 30 mm 3. . The excitation value of D99 means a value corresponding to about 99% when the particle size is converted from a small size to a cumulative percentage. When the D99 value of the particle size distribution is less than about 0.5, the electrical conductivity and structural reinforcing effect of the carbon nanotubes may be reduced or a large cost may be required to control the particle size. When the particle size exceeds 50 m, the carbon nanotubes may be It may not be uniformly dispersed, and there is a fear that curling and precipitation occur.

The content of the carbon nanotubes (A) may be about 50 to about 90% by weight, for example about 65 to about 90% by weight of the total solutes (carbon nanotubes (A) and nitrile rubber (B)). Carbon nanotubes can be uniformly dispersed in the solvent in the above range.

(B) nitrile rubber

Nitrile butadiene rubber (NBR) used in the present invention serves to stabilize the carbon nanotubes to be uniformly dispersed and maintained in a solvent. For example, the nitrile rubber is a conventional nitrile rubber including a repeating unit represented by the following formula (1), hydrogenated nitrile rubber (HNBR) containing a repeating unit represented by the following formula (2), these Mixtures and the like.

In Formulas 1 and 2, m and n may each independently be an integer of 50 to 250, and m: n may be about 2: about 8 to about 8: about 2, for example about 4: to about 6 to about 6: It may be about 4, but is not limited thereto.

Specifically, the nitrile rubber may be hydrogenated nitrile rubber (HNBR). In embodiments, the nitrile rubber may have a weight average molecular weight of about 5,000 to about 50,000 g / mol, for example about 10,000 to about 30,000 g / mol. Carbon nanotubes can be uniformly dispersed in the solvent in the above range. The content of the nitrile rubber (B) may be about 10 to about 50% by weight, for example about 10 to about 35% by weight of the total solutes (carbon nanotubes (A) and nitrile rubber (B)). Carbon nanotubes can be uniformly dispersed in the solvent in the above range. (C) solvent

As the solvent used in the present invention, an organic solvent used in dispersing carbon nanotubes can be used without limitation, for example, N-methylpyrrolidone (NMP), pyridine, morpholine, dimethylaminobenzene, diethylamino Organic solvents containing a nitrogen atom (N) having a lone pair of electrons such as benzene and n ᅳ butylamine, alcohols having 1 to 4 carbon atoms such as methanol, ethanol, propanol, butanol, and the like, and the like, may be used. It is not limited. Specifically, N-methylpyridone (NMP) can be used.

In an embodiment, the content of total solutes (carbon nanotubes (A) and nitrile rubber (B)) is about 1 to about 15% by weight, for example about 3 to about 7% by weight, and the content of the solvent (C) Silver may be from about 85 to about 99 weight percent, for example from about 93 to about 97 weight percent. Carbon nanotube dispersions uniformly dispersed in the above range can be obtained. Carbon nanotube dispersions according to the present invention, if necessary, stabilizers comprising polyvinylidene fluoride (PVDF), polyvinylpyridone (PVP), and diisopropylamine (DIPA), a mixture thereof, and the like. It may further include. When using the stabilizer, about 0.1 parts by weight to about 5 parts by weight, for example, about 0.2 parts by weight to about 1.5 parts by weight based on about 100 parts by weight of the carbon nanotube dispersion (A + B + C), is not limited thereto. . Dispersion stability may be more excellent in the above range. In one embodiment, the method for preparing a carbon nanotube dispersion according to the present invention may include a carbon nanotube (A) and a solvent (C) having a D99 value of about 0.5 to about 50 in a particle size distribution of the carbon nanotube (A). This may include preparing a carbon nanotube slurry by adjusting the mixing and the particle size so as to mix the nitrile rubber (B) with the carbon nano-rubber slurry.

In the preparation of the carbon nano-lough slurry, the mixing and particle size control (dispersion) may be performed by a conventional dispersion method, for example, may be performed by a dispersion method such as ultrasonic treatment, milling. Specifically, it may be performed using a conventional milling equipment, such as a ball mill, a bead mill, a basket mill, and more specifically, a milling apparatus using a bead mill. . The mixing and particle size adjustment time is about 50 nanoparticles D99 value of the particle size distribution

The time that can be adjusted and dispersed below! M is not particularly limited, but may be, for example, about 10 minutes to about 3 hours.

When using the carbon nanotube slurry, it is possible to shorten the process time (particularly, the particle size control time) than the conventional carbon nanotube dispersion production method of mixing all the carbon nanotubes, the dispersing agent and milling them to adjust the particle size.

In an embodiment, the nitrile rubber (B) is formed of a mixed nitrile rubber solution such that the nitrile rubber (B) is contained in the solvent (C) in an amount of about 1 to about 15 wt%, for example about 5 to about 8 wt%. It may be added in the form, but is not limited thereto. However, the total solute (A + B) containing the carbon nanotubes (A) and the nitrile rubber (B) in the carbon nanotube dispersion in which the carbon nanotube slurry and the nitrile rubber are mixed with each other is about 1 To about 15% by weight, the content of the solvent (C) is about 85 to about 99% by weight, and the content of the carbon nano-leuze (A) in the total solute (A + B) is about 50 to about 90% by weight And the content of nitrile rubber (B) should be about 10 to about 50% by weight.

Mixing with the carbon nano-rubber slurry and the nitrile rubber (B) can be used without limitation the usual mixing method such as the dispersion method, stirring. For example, when the nitrile rubber (B) is mixed in the form of a nitrile rubber solution, ease of handling due to dissolution and viscosity of the nitrile rubber can be ensured. In another embodiment, the preparation method mixes the carbon nanotubes (A), nitrile rubber (B) and solvent (C) such that the D99 value of the particle size distribution of the carbon nanotubes (A) is about 0.5 to about 50. And adjusting the particle size.

The mixing and particle size control (dispersion) may be performed by a conventional dispersion method, for example, may be performed by a dispersion method such as ultrasonic treatment, milling and the like. Specifically, it can be carried out using a conventional milling equipment, such as a ball mill, bead mill, basket mill, for example, milling apparatus using a bead mill. .

The mixing and the particle size adjusting time is not particularly limited as long as the carbon nanotubes can be controlled and dispersed at a D99 value of the particle size distribution of about 50 or less, for example, about 1 to about 20 hours.

In an embodiment, the nitrile rubber (B) is formed of a mixed nitrile rubber solution such that the nitrile rubber (B) is contained in the solvent (C) in an amount of about 1 to about 15 wt%, for example about 5 to about 8 wt%. It may be added in the form, but is not limited thereto. However, all The total solute (A + B) including the carbon nanotubes (A) and the nitrile rubber (B) in the carbon nanotube dispersion is about 1 to about 15% by weight, and the content of the solvent (C) is about 85 To about 99% by weight, of the total solute (A + B), the content of the carbon nanotubes (A) is about 50 to about 90% by weight, the content of the nitrile rubber (B) is about 10 to about 50% by weight Should be%. The carbon nanotube dispersion production method of the present invention may further include the step of adding the stabilizer, in order to further improve the dispersion stability. For example, it can be added together with the nitrile rubber. Another aspect of the invention relates to electronic materials such as electrodes. The electronic material is characterized in that it is prepared using the carbon nanotube dispersion.

In an embodiment, the electronic material may be a positive electrode or a negative electrode of a secondary battery. Specifically, the carbon nanotube dispersion may be used as a conductive additive for a secondary battery positive electrode active material or as a carbon black replacement for a negative electrode. Preparation of such a secondary battery positive electrode or negative electrode can be easily performed by those skilled in the art.

[Form for implementation of invention]

Hereinafter, the configuration and operation of the present invention through the preferred embodiment of the present invention will be described in more detail. However, this is presented as a preferred example of the present invention and in no sense can be construed as limiting the present invention.

Details that are not described herein will be omitted since those skilled in the art can sufficiently infer technically. Example

Example 1

To a 77.75 weight% N—methylpyrrolidone (NMP) solvent, add 3.5 weight% carbon nanotubes (manufacturer: Nynocyl, product name: NC7000), and milling equipment (manufacturer: Buhler, device name: K8, beads). Wheat) to adjust the D99 value of the particle size distribution to 24.3. Hydrogenated nitrile rubber containing 18.75% by weight of nitrile rubber solution (8% by weight of repeating unit represented by the following Chemical Formula 2) in a carbon nanotube slurry (CNT slurry) having a particle size adjusted (weight average molecular weight: 16,200 g / mol N-methylpyrrolidone (NMP) solution containing m: n = 4: 6)) was added, and stirred and stabilized for 5 hours to prepare a carbon nanotube dispersion. [Formula 2]

Example 2

To a 77.25 weight% N-methylpyridone (NMP) solvent, add 3.5 weight% carbon nanotubes (manufacturer: Nynocyl, product name: NC7000), and add a milling equipment (manufacturer: Buhler, device name: K8). It was used to adjust the D99 value of the particle size distribution to 18.8. 18.75% by weight of the nitrile rubber solution of Example 1 and 0.5% by weight of polyvinylpyrrolidone (PVP, manufacturer: Sigma Aldrich, product name: PVP10) in a particle size-controlled carbon nanotube slurry (CNT slurry) To this was added, stirring and stabilization for 5 hours to prepare a carbon nanotube dispersion. Example 3

To a 77.25 weight% N-methylpyridone (NMP) solvent, add 3.5 weight% carbon nanotubes (manufacturer: Nynocyl, product name: NC7000), and add a milling equipment (manufacturer: Buhler, device name: K8). It was adjusted so that the D99 value of the particle size distribution was 20.4 mm 3. 18.75% by weight of the nitrile rubber solution of Example 1 and 0.5% by weight of polyvinylidinefluoride (PVDF, manufactured by Solvay) SOLEF 6020) was added, and stirred and stabilized for 5 hours to prepare a carbon nanotube dispersion. Example 4

Add 83% by weight of carbon nanotubes (manufacturer: Nynocyl, product name: NC7000) to 83% by weight of N_methylpyrrolidone (NMP) solvent and milling equipment (manufacturer: Buhler, device name: K8). It adjusted so that D99 value of particle size distribution might be 15.4. 12.5% by weight of the nitrile rubber solution of Example 1 and 1% by weight of diisopropylamine (diisopropylamine: DIPA, manufactured by Daejin Co., Ltd., product name: diisopropylamine, EP) was added, and stirred and stabilized for 5 hours to prepare a carbon nanotube dispersion. Example 5

7.5% by weight of carbon nanotubes (manufacturer: Nynocyl, NC7000) and 43/75% by weight of the nitrile rubber solution of Example 1 were added to 48.75% by weight of N-methylpyridone (NMP) solvent and milled. Using a milling equipment (manufacturer: Buhler, device name: K8), the carbon nanotube dispersion was prepared by adjusting the D99 value of the particle size distribution to be 22.2. Example 6

To a 59.25 weight% N-methylpyridone (NMP) solvent, 7.5 weight% of carbon nanoleube (manufacturer: Nynocyl, product name: NC7000) and 31.25 weight ^< ¾ of the nitrile rubber solution of Example 1 were added and milled milling equipment (manufacturer: Buhler, apparatus: K8) was used to adjust the D99 value of the particle size distribution to 34.6. Next, diisopropylamine (diisopropylamine: DIPA, manufacturer: large purified gold, product name: diisopropylamine, EP grade) was added, and stirred and stabilized for 5 hours to prepare a carbon nanotube dispersion. Comparative Example 1

Add 95 weight% N-methylpyrrolidone (NMP) solvent to 3.5 weight% carbon nanotube (manufacturer: Nynocyl, product name: NC7000), and milling equipment (manufacturer: Buhler, device name: K8). It was used to adjust the D99 value of the particle size distribution to 38.8 mm 3. 1.5 wt% polyvinylpyrrolidone (PVP, manufacturer: Sigma-Aldrich, product name: PVP10) was added to the carbon nanotube slurry (CNT slurry) with particle size adjustment, and stirred and stabilized for 5 hours. Lube dispersions were prepared. Comparative Example 2

To a 95 weight ¾ N_methylpyridone (NMP) solvent, add 3.5 weight% carbon nanotubes (manufacturer: Nynocyl, product name: NC7000), and add a milling equipment (manufacturer: Buhler, device name: K8). It adjusted so that D99 value of particle size distribution might be 40.3. 1.5 wt% polyvinylidinefluoride (PVDF, manufacturer: Solvay, product name: S _^^ EF 6020) was added to the particle size-sized carbon nanotube slurry (CNT slurry) for 5 hours. Stirring and stabilization to prepare a carbon nanotube dispersion. Comparative Example 3

To a 77.75 weight% N-methylpyrrolidone (NMP) solvent, 3.5 weight% carbon nanotubes (manufacturer: Nynocyl, product name: NC7000) and 18.75 weight% of the nitrile rubber solution of Example 1 were added, and 5 hours After stirring and stabilization, a carbon nanotube dispersion (D99 value of carbon nanotube particle size distribution: 380) was prepared.

Property evaluation method

1. Dispersibility Evaluation: After diluting 2,000 times using NMP solvent of the prepared carbon nanotube dispersion, centrifugation at 3,000 rpm for 30 minutes, the supernatant was aliquoted. After leaving the supernatant at room temperature for 24 hours, the bottom and the wall were visually observed. 1 and 2 show the respective photographs. It was evaluated as O if no precipitate was formed and X as fine precipitate was formed. ᅳ

2. Permeability (%): The prepared carbon nanotube dispersion was diluted 2,000-fold using NMP solvent, centrifuged at 3,000 rpm for 30 minutes, the supernatant was collected and UV-visible spectrum was taken at 550 nm to measure the transmittance. Observed. The higher the degree of dispersion of carbon nanotubes, the lower the permeability.

3. Particle size analysis: The prepared carbon nanotube dispersion was diluted 2,000-fold using NMP solvent, and the D99 value of the carbon nanotube particle size distribution was measured using Malvern's Mastersizer 3000 equipment.

Table 1

Content Unit: Weight% From the above results, it can be seen that the carbon nanotube dispersions of the present invention (Examples 1 to 6) have stable dispersibility even after standing for 24 hours, and have a high degree of dispersion due to low UV-visible permeability even after centrifugation at 3,000 rpm. .

On the other hand, when nitrile rubber is not used (Comparative Examples 1 to 2) or when the D99 value of the carbon nanotube particle size distribution exceeds 50 (Comparative Example 3), precipitation of carbon nanotubes occurs and UV-visible permeability is generated. Since it has a high value it can be seen that the dispersibility is significantly lower than the dispersion of the present invention. Simple modifications and variations of the present invention can be easily made by those skilled in the art, and all such modifications or changes can be seen to be included in the scope of the present invention.

Claims

[Range of request]

[Claim 1]

Carbon nanotubes having a D99 value of about 0.5 to about 50 in a particle size distribution;

Nitrile rubber; And

Carbon nanotube dispersion liquid comprising a; solvent.

[Claim 2]

According to claim 1, wherein the content of the total solute including the carbon nanotubes and the nitrile rubber is about 1 to about 15% by weight, the content of the solvent is about 85 to about 99 _% by weight, of the total solute, The carbon nanotube content is about 50 to about 90% by weight, the content of the nitrile rubber is about 10 to about 50% by weight carbon nanotube dispersion.

[Claim 3]

The carbon nanotube dispersion of claim 1, wherein the carbon nanotubes include at least one of single-walled carbon nanotubes, double-walled carbon nanotubes, multi-walled carbon nanotubes, and bundle-type carbon nanotubes.

[Claim 4]

The nitrile rubber according to claim 1, wherein the nitrile rubber comprises at least one of a nitrile rubber including a repeating unit represented by the following Chemical Formula 1, and a hydrogenated nitrile rubber (HNBR) comprising a repeating unit represented by the following Chemical Formula 2. Carbon nanotube dispersions characterized in that:

[Formula 1]

In Chemical Formulas 1 and 2, m and n are each independently 50 to 250.

[Claim 5] The carbon nanotube dispersion of claim 1, wherein the nitrile rubber has a weight average molecular weight of about 5,000 to about 50,000 g / mol.

[Claim 6]

The carbon nanotube dispersion liquid according to claim 1, wherein the solvent comprises at least one of an organic solvent containing a nitrogen atom (N) having an unshared electron pair, and an alcohol having 1 to 4 carbon atoms.

[Claim 7]

The method of claim 1, wherein the carbon nanotube dispersion further comprises a stabilizer comprising at least one of polyvinylidene fluoride (PVDF), polyvinylpyridone (PVP), and diisopropylamine (DIPA) Carbon nano leuubric dispersion, characterized in that.

[Claim 8]

Preparing a carbon nanotube slurry by mixing and adjusting the carbon nanotube and the solvent so that the D99 value of the particle size distribution of the carbon nanotube is about 0.5 to about 50; And

Mixing nitrile rubber in the carbon nanotube slurry;

Carbon nanotube dispersion manufacturing method comprising the step.

[Claim 9]

The method of claim 8, wherein the content of the total solute including the carbon nanotubes and the nitrile rubber is about 1 to about 15% by weight, the content of the solvent is about 85 to about 99% by weight, of the total solute, The content of the carbon nanotubes is about 50 to about 90 weight ^< ¾, and the content of the nitrile rubber is about 10 to about 50 weight percent carbon nanotube dispersion production method.

[Claim 10]

The method of claim 8, wherein in the preparation of the carbon nano-leuze slurry, the mixing and particle size control are performed by a dispersion method including at least one of ultrasonic treatment and milling.

[Claim 11] 19. The method according to claim 18, further comprising a combination of the nitrile rubber with a stabilizer comprising at least one of polyvinylidene fluoride (PVDF), polyvinylpyridone (PVP), and diisopropylamine (DIPA). Carbon nanotube dispersion production method characterized in that.

[Claim 12]

An electronic material produced using the carbon nano-leuv dispersion according to any one of claims 1 to 7.

[Claim 13]

The electronic material according to claim 12, wherein the electronic material is a positive electrode or a negative electrode of a secondary battery.