KR20230137815A - Apparatus for manufacturing carbon nano tube fiber and the carbon nano tube fiber manufactured by the same - Google Patents

Abstract

The present invention increases the physical properties of the CNT fiber by increasing the length of the CNT, and improves productivity while maintaining the increased physical properties, thereby improving the physical properties and productivity of the CNT fiber at the same time. After forming the inner tube 300, the flow rate of the first gas mixture supplied to the inner tube 300, the flow rate of the second gas mixture mixed gas supplied to the reaction tube 200, and the catalyst formation area 210 ) a carbon nanotube fiber manufacturing device configured to control the temperature change per unit length from the inlet side to the heat area 220, the diameter of the inner tube 300 in C (cm), and the temperature change parameter per time, and thereby Provided is a manufactured carbon nanotube fiber.

Description

Apparatus for manufacturing carbon nanotube fiber and carbon nanotube fiber manufactured therefrom {Apparatus for manufacturing carbon nano tube fiber and the carbon nano tube fiber manufactured by the same}

The present invention relates to a carbon nanotube fiber manufacturing apparatus and a carbon nanotube fiber manufactured therefrom, and more specifically, to a carbon nanotube fiber manufacturing apparatus for manufacturing carbon nanotube fibers with improved strength, and to carbon nanotube fibers manufactured therefrom. It's about tube fibers.

CNT (carbon nano tube) fiber is a material that is light yet has high strength and conductivity, and is attracting attention as a next-generation material replacing carbon fiber.

There are three main methods for producing CNT fibers: forest spinning, liquid crystal spinning, and direct spinning.

Among these, the direct spinning method is capable of producing continuous fibers, and it can be manufactured inexpensively in the future because it is a method of manufacturing carbon precursors such as methane or acetone directly into fibers, rather than purchasing expensive CNT powder and turning it into fibers. It is considered the most suitable method for mass production of CNT fibers.

Direct radiation is a carrier gas (background gas that maintains the atmosphere: hydrogen, argon, nitrogen, etc.) and carbon precursors (all types of hydrocarbons such as methane, acetone, alcohol, etc.) at the entrance of the heat treatment furnace. , when a catalyst (a compound containing Fe, such as ferrocene) or a co-catalyst (a compound containing S, such as thiophene) is flowed, it moves toward the heat zone inside the heat treatment furnace. As it is gradually heated, the carbon precursor, catalyst, and cocatalyst decompose to become sources of carbon, iron, and sulfur, respectively. When it reaches the heat area, it becomes the temperature at which CNTs grow (about 1150 to 1300 ℃, broadly 900 to 1500 ℃). CNTs begin to grow in this area.

As CNTs grow and gas continues to flow in from the entrance of the heat treatment furnace, the grown CNTs continue to be pushed toward the outlet. When the CNTs grow sufficiently and meet nearby CNTs, they are formed into a cotton-like shape.

When the formed cotton is pulled out from the bottom and twisted or passed through water, it contracts and takes the form of a thread, which becomes CNT fiber.

In order to improve the physical properties of CNT fibers, it is better for the individual CNTs present inside the fiber to have high crystallinity and a long length.

However, there is a big problem that productivity decreases when the amount of catalyst and carbon source is reduced to improve crystallinity. For this reason, the physical properties and productivity (diameter, linear density) of CNT fibers are usually inversely proportional, and this is a major cause of hindering the application of CNT fibers.

Therefore, a new method that can maintain physical properties and improve productivity is required.

Meanwhile, in order to lengthen the CNT, it is necessary to provide enough time for the CNT to grow, so it is better to extend the time it stays in the heat zone.

However, because of cost issues, heat treatment furnaces cannot be expanded indefinitely. Therefore, a realistic method is to reduce the amount of gas introduced and slow down the gas flow, thereby lengthening the residence time.

However, in this case, the residence time in the upper part of the heat zone and the catalyst formation zone becomes longer, which leads to overgrowth of the catalyst.

If the catalyst grows too large, the CNTs grow multi-walled rather than single-walled or double-walled, and CNT fibers made of multi-walled CNTs have poor physical properties. It becomes lower. Since the increase in physical properties due to the increase in the number of carbon nanotube walls is greater than the benefit due to the lengthening, the physical properties of the resulting carbon nanotube fiber decrease.

However, it is difficult to manufacture the heat area close to the entrance to the heat treatment furnace, and there are problems with safety and maintenance, so there is a limit to forming the heat area close to the entrance to the heat treatment furnace.

Republic of Korea Patent No. 10-1415078 (announced on July 4, 2014)

Accordingly, an embodiment of the present invention to solve the problems of the prior art described above allows the catalyst to grow into single wall or double wall CNTs without overgrowth, while lengthening the length of the produced CNTs. A carbon nanotube fiber manufacturing device that simultaneously improves the physical properties and productivity of CNT fibers by increasing the physical properties of CNT fibers and improving productivity while maintaining the increased physical properties, and the carbon nanotube fibers manufactured thereby. The technical problem to be solved is to provide .

The technical problem to be achieved by the present invention is not limited to the technical problem mentioned above, and other technical problems not mentioned can be clearly understood by those skilled in the art from the description below. There will be.

One embodiment of the present invention for achieving the technical object of the present invention described above includes a reaction tube 200 having a catalyst formation region 210 on the inlet side and a heat region 220 on the lower side, and an inlet of the reaction tube 200. A heat treatment furnace (100) including an inner tube (300) located inside; controlling the supply of a first gas mixture including a carrier gas, a carbon source, a catalyst, and a co-catalyst supplied to the inner tube (300). An inner tube flow control unit 400 that controls the supply of a second gas mixture containing a carrier gas and a carbon source supplied to the reaction tube 200 outside the inner tube 300. ); a heat area temperature control unit 600 that controls the temperature of the heat area 600; and a catalyst in the catalytic growth of the inner tube 300 and a portion of the carbon source to grow into CNT, It is configured to include a main control unit 700 that selectively controls at least one of the tube flow control unit 400, the reaction tube flow control unit 500, or the heat area temperature control unit 600, so that the length is long and productivity is increased. A carbon nanotube fiber manufacturing device is provided, which allows manufacturing carbon nanotube fibers with improved strength.

The main controller 700 sets the flow rate of the first gas mixture supplied to the inner tube 300 to A (cc/min) and the flow rate of the second gas mixture supplied to the reaction tube 200 to Y. (cc/min), the temperature change per unit length from the inlet side of the catalyst formation area 210 to the heat area 220 is B (°C/cm), and the diameter of the inner tube 300 is C ( cm) and when the temperature change parameter per time is D (°C/cm), D (°C/ ^cm ) = A A technical feature is that it is configured to selectively control at least one of the control unit 400, the reaction tube flow control unit 500, or the heat area temperature control unit 600.

The value x obtained by dividing the length of the inner tube 300 located inside the reaction tube 200 by the length from the entrance of the reaction tube 200 to the starting point of the hit area ranges from 0.2 to 2.0. It is characterized by

The ratio A/Y of the flow rate Y (cc/min) of the second gas mixture supplied to the reaction tube 200 to the flow rate A (cc/min) of the first gas mixture supplied to the inner tube 300 is 0. It is characterized by having a range of from 2 to 2.

Another embodiment of the present invention for achieving the above-described object provides carbon nanotube fibers manufactured by the carbon nanotube fiber manufacturing apparatus.

The carbon nanotube fiber is characterized by a linear density of 0.3 to 0.7 g/km and a specific strength of 1.6 to 2.3 N/tex.

The carbon nanotube fiber is characterized by a linear density of 0.3 to 0.7 g/km and a tension of 0.7 to 1.3 N.

The embodiment of the present invention with the above-described configuration has the effect of enabling the production of CNT fibers with increased tex while maintaining the crystallinity and physical properties of the fiber by additionally supplying only the carbon source without a catalyst from the external gas line. provides.

In addition, the embodiment of the present invention provides the effect of increasing the physical properties of the fiber by controlling the growth of the catalyst in the inner tube and producing CNT fibers composed of SWCNT and DWCNT with increased length.

In addition, the embodiment of the present invention provides the effect of facilitating maintenance because only the inner tube 300 needs to be replaced even if additional problems such as contamination occur.

The effects of the present invention are not limited to the above-mentioned effects, but should be understood to include all effects that can be inferred from the composition of the invention described in the detailed nickname or claims of the present invention.

Figure 1 is a schematic diagram of a carbon nanotube fiber manufacturing apparatus 1 according to an embodiment of the present invention.
Figure 2 is a diagram showing the detailed structure of the heat treatment furnace 100 in an embodiment of the present invention.
Figure 3 is a Raman graph of Comparative Example 1 and Example 1.
Figure 4 is a Raman graph of Comparative Example 3.
Figure 5 is a Raman graph of Comparative Example 9.

Hereinafter, the present invention will be described with reference to the attached drawings. However, the present invention may be implemented in various different forms and, therefore, is not limited to the embodiments described herein. In order to clearly explain the present invention in the drawings, parts that are not related to the description are omitted, and similar parts are given similar reference numerals throughout the specification.

Throughout the specification, when a part is said to be "connected (connected, contacted, combined)" with another part, this means not only "directly connected" but also "indirectly connected" with another member in between. "Includes cases where it is. Additionally, when a part "includes" a certain component, this does not mean that other components are excluded, but that other components can be added, unless specifically stated to the contrary.

The terms used herein are only used to describe specific embodiments and are not intended to limit the invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, terms such as “comprise” or “have” are intended to indicate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but are not intended to indicate the presence of one or more other features. It should be understood that this does not exclude in advance the possibility of the existence or addition of elements, numbers, steps, operations, components, parts, or combinations thereof.

Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings.

FIG. 1 is a schematic diagram of a carbon nanotube fiber manufacturing apparatus 1 according to an embodiment of the present invention, and FIG. 2 is a diagram showing the detailed structure of a heat treatment furnace 100 according to an embodiment of the present invention.

1 and 2, the carbon nanotube fiber manufacturing apparatus 1 includes a reaction tube 200 having a catalyst formation region 210 on the inlet side and a heat region 220 on the bottom of the reaction tube 200. A heat treatment furnace (100) including an inner tube (300) located inside the inlet; supplying a first gas mixture including a carrier gas, a carbon source, a catalyst, and a cocatalyst supplied to the inner tube (300). An inner tube flow control unit 400 for controlling; A reaction tube flow control unit for controlling the supply of a second gas mixture containing a carrier gas and a carbon source supplied to the reaction tube 200 outside the inner tube 300 ( 500); a heat area temperature control unit 600 for controlling the temperature of the heat area 600; and to grow a catalyst in the catalytic growth of the inner tube 300 and to grow a portion of the carbon source into CNT, It is configured to include a main control unit 700 that selectively controls at least one of the inner tube flow control unit 400, the reaction tube flow control unit 500, or the heat area temperature control unit 600, and is long in length and has high productivity. It is characterized by enabling the production of carbon nanotube fibers with improved strength.

The main controller 700 sets the flow rate of the first gas mixture supplied to the inner tube 300 to A (cc/min) and the flow rate of the second gas mixture supplied to the reaction tube 200 to Y. (cc/min), the temperature change per unit length from the inlet side of the catalyst formation area 210 to the heat area 220 is B (°C/cm), and the diameter of the inner tube 300 is C ( cm) and when the temperature change parameter per time is D (°C/cm), D (°C/ ^cm ) = A A technical feature is that it is configured to selectively control at least one of the control unit 400, the reaction tube flow control unit 500, or the heat area temperature control unit 600.

The value x obtained by dividing the length of the inner tube 300 located inside the reaction tube 200 by the length from the entrance of the reaction tube 200 to the starting point of the hit area ranges from 0.2 to 2.0. It is characterized by

The ratio A/Y of the flow rate Y (cc/min) of the second gas mixture supplied to the reaction tube 200 to the flow rate A (cc/min) of the first gas mixture supplied to the inner tube 300 is 0. It is characterized by having a range of from 2 to 2.

The carbon nanotube fiber manufacturing apparatus 1 of the embodiment of the present invention having the above-described configuration additionally installs an inner tube 300 having a suitable diameter inside the reaction tube 200 of the heat treatment furnace 100, and catalyst In the catalyst growth area 210, where the flow rate is quickly adjusted to synthesize a suitable catalyst, the flow rate is again allowed to flow at a slow speed in the heat area 220, the lower area of the inner tube 300, to create enough CNTs to grow. Give it time.

At this time, the flow rate of the gas flowing inside the inner tube 300, the internal temperature gradient, and the diameter of the inner tube 300 are very important factors that affect the growth of the catalyst inside the flowing gas, and it is necessary to set an accurate range for this part. .

If the inner tube 300 is too short, it is similar to a conventional heat treatment furnace without the inner tube 300, and if it is too long, it has the same configuration as a heat treatment furnace with just one inner tube 300, so the length of the inner tube 300 is also strictly controlled. It must be defined clearly.

Additionally, by injecting a second gas mixture consisting of only a carrier gas and a carbon source without a catalyst into the outer line of the inner tube 300, the short CNTs coming out of the inner tube 300 grow longer due to the supply of additional carbon source. make it possible

To this end, the role of the inner tube 300 is not to simply grow the catalyst, but to discharge the CNTs in a partially grown state. When only catalyst precursor gas is introduced into the inner tube 300 without a carbon source, only catalyst particles without CNT growth are created in the inner tube 300. In this case, growth is additionally boosted to increase length and productivity. This increased CNTs cannot be produced.

Therefore, the carbon nanotube fiber manufacturing apparatus 1 of the embodiment of the present invention introduces an inner tube 300 for controlling catalyst growth and forming pre-grown CNTs into the reaction tube 200, A flow path for supplying a second gas mixture containing an additional carrier gas and a carbon source is additionally formed outside the inner tube 300.

As shown in FIG. 2, the length (x) of the inner tube 300 becomes the starting position of the reaction tube 200 when x = 0, and becomes the starting position of the hit area 220 when x = 1.

As described above, the end x of the inner tube 30 is located at 0.2 to 2, and the flow rate Y (cc/min) of the second gas mixture supplied to the reaction tube 200 is the inner tube 300. The ratio A/Y with respect to the flow rate A (cc/min) of the first gas mixture supplied to has a range of 0 to 2.

Another embodiment of the present invention for achieving the above-described object provides carbon nanotube fibers manufactured by the carbon nanotube fiber manufacturing apparatus.

The carbon nanotube fiber is characterized by a linear density of 0.3 to 0.7 g/km and a specific strength of 1.6 to 2.3 N/tex.

The carbon nanotube fiber is characterized by a linear density of 0.3 to 0.7 g/km and a tension of 0.7 to 1.3 N.

<Experimental example>

Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 interior
tube O O O O O O O O D 494 1190 2060 2826 1190 1190 1190 1190 X One One One One 2 0.4 One One Y One One One One One One 0.1 2

Comparative Example 1 Comparative example 2 Comparative Example 3 Comparative example 4 Comparative Example 5 Comparative Example 6 Comparative Example 7 Inner tube (300) X X O O O O O D 295 862 396 4722 494 494 494 X - - One One One 2.5 0.1 Y - - One One 0 One One

Comparative example 8 Comparative Example 9 Inner tube (300) O O D 494 494 X One One Y One One explanation Carrier gas + carbon source + catalyst + subcatalyst are introduced to the outside of the inner tube (300). Inject only carrier gas + catalyst + subcatalyst into the inner tube (300) without carbon source.

The experiment was conducted under the experimental conditions shown in Tables 1 to 3. Examples and comparative examples in Tables 1 to 3 were prepared as follows.

Example 1

Methane was used as a carbon source, ferrocene as a catalyst, and thiophene as a subcatalyst. As a carrier gas, a 3:1 mixture of hydrogen and argon was used. The ratio of carrier gas and methane was set to 15:1, the ratio of methane to ferrocene was set to 200:1, and the ratio of methane to thiophene was set to 60:1.

The temperature of the heat zone 220 was set at 1200 degrees.

The produced fibers were wound at a speed of 8 m/min, and the linear density and tension of the fibers were measured to calculate the specific strength.

The inner tube 300 was installed inside, and the parameter D mentioned above was set to 494.

The length of the inner tube 300 is x = 1, and the gas outside the inner tube 300 flows carrier gas and carbon source at A/Y = 1 so that the gas outside the inner tube 300 has the same speed ratio as the inner tube 300. gave.

Example 2

Same as Example 1, but the parameter D was set to 1190 to produce fiber.

Example 3

The same as Example 1, but the fiber was produced by setting the parameter D to 2060.

Example 4

Same as Example 1, but the parameter D was set to 2826 to produce fiber.

Example 5

The same as Example 2, but the length of the inner tube 300 was set to X = 2 to produce fibers.

Example 6

Same as Example 2, but the length of the inner tube 300 was set to X = 0.4 to produce fiber.

Example 7

Same as Example 2, but the flow rate of the gas outside the inner tube 300 was set to Y = 0.1 to produce fibers.

Example 8

Same as Example 2, but the flow rate of the gas outside the inner tube 300 was set to Y = 2.0 to produce fibers.

Comparative Example 1

It is the same as Example 1, but there is no inner tube 300 inside, and parameter D is set to 295.

Comparative example 2

Like Comparative Example 1, there was no inner tube 300 inside, but the gas flow rate was increased and the parameter D was set to 862.

Comparative example 3

As in Example 1, there is an inner tube 300 inside, but D is set to 396 because the diameter of the inner tube 300 is large.

Comparative example 4

As in Example 1, there is an inner tube 300 inside, but the diameter of the inner tube 300 is small, so D is set to 4722.

Comparative Example 5

The same as Example 1, but synthesized without gas flowing outside the inner tube 300.

Comparative Example 6

Same as Example 1, but the length x of the inner tube 300 was set to 2.5.

Comparative example 7

Same as Example 1, but the length x of the inner tube 300 was set to 0.1.

Comparative example 8

It was the same as Example 1, but in addition to carrier gas and carbon source, a catalyst and a subcatalyst were added to the gas flowing outside the inner tube 300.

Comparative Example 9

It was the same as Example 1, but only carrier gas, catalyst, and subcatalyst were introduced into the inner tube 300 without a carbon source, and a carbon source was supplied to the gas flowing from the outside as in Example 1.

Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 Linear density (g/km) 0.552 0.558 0.401 0.353 0.403 0.676 0.552 0.385 Specific strength (N/tex) 1.62 2.28 1.98 2.01 1.86 1.7 1.8 2 Tension (N) 0.89 1.27 0.79 0.71 0.75 1.15 One 0.77

Comparative Example 1 Comparative example 2 Comparative example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Comparative example 7 Comparative example 8 Comparative Example 9 linear density
(g/km) 0.214 0.133 0.403 0.157 0.207 0.154 0.187 - 0.427 Specific strength (N/tex) 0.6 0.59 0.92 1.41 1.56 1.49 0.93 - 0.2 Tension (N) 0.13 0.08 0.37 0.22 0.32 0.23 0.17 - 0.08

Tables 4 and 5 show the linear density (g/km) of the carbon nanotube fibers of Experimental Examples 1 to 8 and Comparative Examples 1 to 9. It shows the specific strength (N/tex) and tension (N). The examples were all produced within the range set in the embodiment of the present invention, and in common, the additional carbon source input from the outside of the inner tube 300 resulted in high It can be seen that it has linear density (∝ diameter, productivity), and the growth of the catalyst in the inner tube 300 is controlled so that it has high specific strength at the same time.

As a result, the tension of the produced fiber is very high compared to the comparative example, and it has excellent physical properties and can secure high productivity.

Figure 3 is a Raman graph of Comparative Example 1 and Example 1.

In Comparative Example 1, there is no inner tube 300 and the D value is small, so CNT fibers mainly composed of MWCNTs are obtained (see FIG. 3, IG/ID is low, indicating that it is composed of MWCNTs with low crystallinity), which results in physical properties. This was very low.

In Comparative Example 2, there was no inner tube 300, but the D value was set according to the range of the example. In this case, DWCNTs with a short length were obtained, so the linear density was greatly reduced and a fiber with very low physical properties was obtained.

Figure 4 is a Raman graph of Comparative Example 3.

Comparative Example 3 is a fiber synthesized under conditions in which an inner tube 300 exists and an additional carbon source is added from outside the inner tube 300, but the D value is set to be smaller than the range claimed in the present patent claims. Similar to Comparative Example 1, a fiber composed of MWCNT was obtained (see Figure 4), and the productivity was high due to the addition of an additional carbon source, but the physical properties were still low.

In Comparative Example 4, there is an inner tube 300, and additional carbon source is added outside the inner tube 300. However, it was synthesized under conditions where the D value was set larger than the claims, so the linear density was somewhat low and the physical properties were also relatively low. It was low compared to the example.

Comparative Example 5 is a case in which no additional carbon source is added outside the inner tube 300, and productivity is very low compared to the Example. In addition, because there was no additional carbon source, CNTs grew relatively less compared to the examples, so the physical properties were also somewhat lower than those of the examples.

Comparative Example 6 was a fiber synthesized in a case where the inner tube 300 was excessively long, and since most CNT growth occurred only within the inner tube 300, productivity was somewhat low.

Comparative Example 7 is a case where the length of the inner tube 300 is excessively short. Although it is observed that the physical properties are improved when the inner tube 300 is present even if it is short, fibers similar to Comparative Example 2 without the inner tube 300 are obtained.

In Comparative Example 8, carrier gas, carbon source, catalyst, and subcatalyst were added to the outside of the inner tube 300 in the same way as the inner tube 300, and the CNT aerosol generated inside the heat treatment furnace 100 ( It is impossible to obtain it because the aerogels do not come down and are tangled in the tube. Through this, it can be seen that it is meaningless to simply divide the same gas, i.e., carrier gas, carbon source, catalyst, and subcatalyst, into two parts, and that it is preferable to add only the carbon source after partially growing the catalyst and carbon source. I was able to.

Figure 5 is a Raman graph of Comparative Example 9.

In Comparative Example 9, an experiment was performed by flowing only a catalyst, a subcatalyst, and a carbon source along with a carrier gas inside the inner tube 300 without a carbon source.

When synthesized in this way, the size of the nanoparticles within the inner tube 300 is controlled according to the D value, but since there is no carbon source, CNTs cannot grow within the inner tube 300, and only the catalyst is formed as nanoparticles. As it came out of the inner tube (300), a carbon source was supplied for the first time to grow into CNT.

In this case, there are some obvious disadvantages compared to the embodiment. Unlike the embodiment where growth is promoted twice by supplying carbon sources twice, productivity is somewhat lowered because growth occurs only once.

In addition, unlike the embodiment in which CNTs grow at the same time as the catalytic nanoparticles are formed, as the process is divided into two stages, the size of the catalytic nanoparticles is formed larger due to collisions and aggregation between the nanoparticles, which causes them to grow into MWCNTs. This is done (see Figure 5). To prevent this, adding less catalyst will further reduce productivity, so this is not a desirable solution.

Although the technical idea of the present invention described above has been described in detail in preferred embodiments, it should be noted that the above-described embodiments are for illustrative purposes only and are not intended for limitation. Additionally, those skilled in the art of the present invention will understand that various embodiments are possible within the scope of the technical idea of the present invention. Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the attached claims.

1: Carbon nanotube fiber manufacturing device
10: CNT fiber
100: Heat treatment furnace
200: reaction tube
210: Catalytic growth area
220: Hit area
300: Inner tube
400: Inner tube flow control unit
500: Reaction tube flow control unit
600: Heat area temperature control unit
700: Main fisherman
800: Water tank
A (cc/min): Flow rate of the first gas mixture supplied to the inner tube
Y (cc/min): flow rate of the second gas mixture supplied to the reaction tube
B°C/cm: Unit length from the inlet side of the catalyst formation area 210 to the heat area 220 Temperature change
C (cm): Diameter of the inner tube (if the tube is not circular, convert the cross-sectional area to the diameter)

Claims (7)

A heat treatment furnace 100 including a reaction tube 200 having a catalyst formation area 210 at the inlet side and a heat area 220 at the bottom, and an inner tube 300 located inside the inlet of the reaction tube 200;
an inner tube flow control unit 400 that controls the supply of a first gas mixture including a carrier gas, a carbon source, a catalyst, and a cocatalyst supplied to the inner tube 300;
a reaction tube flow control unit 500 that controls the supply of a second gas mixture containing a carrier gas and a carbon source supplied to the reaction tube 200 outside the inner tube 300;
A hit area temperature control unit 600 that controls the temperature of the hit area 600; and
In the catalytic growth of the inner tube 300, the inner tube flow control unit 400, the reaction tube flow control unit 500, or the heat zone temperature control unit ( A carbon nanotube fiber manufacturing device, characterized in that it includes a main control unit 700 that selectively controls at least one of the 600). The method of claim 1, wherein the main control unit 700,
The flow rate of the first gas mixture supplied to the inner tube 300 is A (cc/min), the flow rate of the second gas mixture supplied to the reaction tube 200 is Y (cc/min), and the catalyst The temperature change per unit length from the entrance side of the forming area 210 to the hit area 220 is B (°C/cm), the diameter of the inner tube 300 is C (cm), and the temperature change parameter per time is When D (°C/cm), D (°C/ ^cm ) = A A carbon nanotube fiber manufacturing device characterized in that it is configured to selectively control at least one of the flow rate control unit 500 or the heat area temperature control unit 600. According to paragraph 1,
The value x obtained by dividing the length of the inner tube 300 located inside the reaction tube 200 by the length from the entrance of the reaction tube 200 to the starting point of the hit area ranges from 0.2 to 2.0. A carbon nanotube fiber manufacturing device, characterized in that. According to paragraph 1,
The ratio A/Y of the flow rate Y (cc/min) of the second gas mixture supplied to the reaction tube 200 to the flow rate A (cc/min) of the first gas mixture supplied to the inner tube 300 is 0. A carbon nanotube fiber manufacturing device characterized in that it has a range of from 2 to 2. A carbon nanotube fiber manufactured by the carbon nanotube fiber manufacturing apparatus of claim 1. According to clause 5,
A carbon nanotube fiber characterized by a linear density of 0.3 to 0.7 g/km and a specific strength of 1.6 to 2.3 N/tex. According to clause 5,
A carbon nanotube fiber characterized by a linear density of 0.3 to 0.7 g/km and a tension of 0.7 to 1.3 N.