Patent Publication Number: US-2023146721-A1

Title: Apparatus for dispersing carbon nanotubes

Description:
TECHNICAL FIELD 
     The present invention relates to an apparatus for dispersing carbon nanotubes, and more specifically, to an apparatus for dispersing carbon nanotubes, which may rapidly disperse a carbon nanotube bundle without damaging a carbon nanotube. 
     BACKGROUND ART 
     Lithium ion batteries are manufactured by a process of making a slurry in which an active material powder for each positive electrode and negative electrode is dispersed in a solution, coating and drying the slurry on an electrode plate, overlapping positive and negative electrode plates manufactured with a separator interposed therebetween, putting the positive and negative electrode plates into a container, and injecting an electrolytic solution thereinto. When the slurry is made, it is possible to improve performance of the battery by mixing a conductive agent that functions to facilitate a smooth flow of electricity between the active material powders to make the slurry. 
     Carbon nanotubes (CNT) have a form of a line having a length of several thousand times the diameter, electrical conductivity similar to copper, and an excellent function as a conductive agent. When the carbon nanotubes are used, more space can be secured in the battery than when conventional conductive agents are used, and thus a battery capacity can be increased by putting more active materials into the remaining space. 
     However, the carbon nanotubes need to be evenly dispersed in the solution to use the carbon nanotubes because the carbon nanotubes have a form in which several strands are entangled in bundles. A method of dispersing a carbon nanotube used in the related art includes a physical dispersion method using ultrasonic waves or bead mills, and a chemical dispersion method using a surfactant or the like. 
     Among the physical methods, an ultrasonic dispersion method is a method of dispersing the carbon nanotube by applying ultrasonic waves after putting a carbon nanotube powder into an organic solvent such as n-methyl-2-pyrrolidone (NMP) or dimethylformamide (DMF), but this method has a problem that the stability of the solution is degraded. 
     Meanwhile, among the physical methods, a method using bead mills, a high shear disperser, or the like has a problem in that a length of the carbon nanotube is reduced because the strands of the carbon nanotube are cut. 
     The chemical method has a problem in that it requires an additional process of attaching and removing chemical substances in addition to components required for the battery. Accordingly, there is a need to solve the problems. 
     A background art of the invention is disclosed in Korean Patent Application Laid-Open No. 10-2019-0091833 (published on Aug. 7, 2019, entitled METHOD OF MANUFACTURING CARBON NANOTUBE DISPERSION SOLUTION). 
     Technical Problem 
     The present invention has been made in efforts to solve the above problems and is directed to providing an apparatus for dispersing carbon nanotubes, which can rapidly disperse a carbon nanotube bundle without damaging a carbon nanotube. 
     Technical Solution 
     An apparatus for dispersing carbon nanotubes according to the present invention includes: a solution receiving part including a solution receiving body portion, a flow pipe portion formed by passing through an inside of the solution receiving body portion, and through which a CNT solution flows, and a spiral guide portion formed on an inner wall of the flow pipe portion and configured to guide the CNT solution to spirally flow; and an ultrasonic vibrator part mounted on an outer wall of the solution receiving body portion and configured to provide ultrasonic waves to the CNT solution, wherein the spiral guide portion has a right spiral type and a left spiral type alternately formed on the inner wall of the flow pipe portion so that a rotation direction is changed twice or more. 
     In the present invention, a Reynolds number of the CNT solution is calculated by an equation below, and an inner diameter of the flow pipe portion is set so that the Reynolds number is 4,000 or less. 
     The equation is 
     
       
         
           
             
               Re 
               = 
               
                 
                   ρ 
                   ⁢ 
                   VD 
                 
                 μ 
               
             
             , 
           
         
       
     
     where μ refers to a viscosity coefficient of the CNT solution, V refers to a velocity of the CNT solution, D refers to an inner diameter of the flow pipe portion, and ρ refers to a density of the CNT solution. 
     In the present invention, the apparatus for dispersing carbon nanotubes may further include a conical dispersion part mounted an inside an outlet of the flow pipe portion, and configured to allow the CNT solution to collide and be discharged to an outside of the outlet along an inclined surface. 
     In the present invention, the flow pipe portion may include a straight pipe portion configured to guide the CNT solution to flow linearly toward the outlet. 
     In the present invention, the spiral guide portion may be formed with grooves recessed in or protrusions protruding from the inner wall of the flow pipe portion. 
     In the present invention, the ultrasonic vibrator part may include a contact portion configured to come into contact with an outer wall of the solution receiving body portion, and a width at which the contact portion comes into contact with the outer wall of the solution receiving body portion may be formed to be smaller than an inner diameter of the flow pipe portion, or less than twice the inner diameter of the flow pipe portion. 
     Advantageous Effects 
     According to the present invention, a CNT solution can be formed as a laminar flow while spirally flowing by a spiral guide portion of a solution receiving part and dispersed by an ultrasonic vibration of an ultrasonic vibrator part. 
     In addition, according to the present invention, it is possible to loosen a lump portion of the CNT solution by a conical dispersion part installed at an outlet of the solution receiving part. 
     In addition, according to the present invention, a plurality of apparatus for dispersing carbon nanotubes is disposed in parallel to circulate the CNT solution to a tank part, so that it is possible to solve problems such as damage to CNT strands, the difficulty in separating the lump of the CNT, the difficulty in evenly dispersing the entire solution, high manufacturing costs, and an increase in dispersion time, and evenly disperse the CNT in a solution. 
    
    
     
       DESCRIPTION OF DRAWINGS 
         FIG.  1    is an assembly perspective view schematically showing an apparatus for dispersing carbon nanotubes according to one embodiment of the present invention. 
         FIG.  2    is a perspective view schematically showing the apparatus for dispersing carbon nanotubes according to one embodiment of the present invention. 
         FIG.  3    is a front view schematically showing the apparatus for dispersing carbon nanotubes according to one embodiment of the present invention. 
         FIG.  4    is a partially enlarged view schematically showing portion ‘A’ in  FIG.  1   . 
         FIG.  5    is a partially enlarged view schematically showing portion ‘B’ in  FIG.  2   . 
         FIG.  6    is a conceptual diagram schematically showing a process of releasing a CNT lump portion of a CNT solution in a conical dispersion part according to one embodiment of the present invention. 
         FIG.  7    is a conceptual diagram schematically showing a carbon nanotube dispersion integration device according to one embodiment of the present invention. 
         FIG.  8    is a perspective view schematically showing a first stirring part and a second stirring part according to one embodiment of the present invention. 
     
    
    
     MODES OF THE INVENTION 
     Hereinafter, an apparatus for dispersing carbon nanotubes according to one embodiment of the present invention will be described with reference to the accompanying drawings. In this process, thicknesses of lines or sizes of components shown in the drawings may be exaggeratedly shown for clarity and convenience of description. 
     In addition, the terms to be described below are terms defined in consideration of functions in the present invention, which may vary depending on intentions or customs of users and operators. Accordingly, these terms should be defined based on the contents throughout this specification. 
       FIG.  1    is an assembly perspective view schematically showing an apparatus for dispersing carbon nanotubes according to one embodiment of the present invention,  FIG.  2    is a perspective view schematically showing the apparatus for dispersing carbon nanotubes according to one embodiment of the present invention,  FIG.  3    is a front view schematically showing the apparatus for dispersing carbon nanotubes according to one embodiment of the present invention,  FIG.  4    is a partially enlarged view schematically showing portion ‘A’ in  FIG.  1   ,  FIG.  5    is a partially enlarged view schematically showing portion ‘B’ in  FIG.  2   ,  FIG.  6    is a conceptual diagram schematically showing a process of releasing a CNT lump portion of a CNT solution in a conical dispersion part according to one embodiment of the present invention,  FIG.  7    is a conceptual diagram schematically showing a carbon nanotube dispersion integration device according to one embodiment of the present invention, and  FIG.  8    is a perspective view schematically showing a first stirring part and a second stirring part according to one embodiment of the present invention. 
     Referring to  FIGS.  1  to  6   , an apparatus  1  for dispersing carbon nanotubes according to one embodiment of the present invention includes a solution receiving part  100  and an ultrasonic vibrator part  200 . 
     The solution receiving part  100  receives a CNT solution  10 . The CNT solution  10  is a solution including a carbon nanotube (CNT). The solution receiving part  100  includes a solution receiving body portion  110 , a flow pipe portion  120 , and a spiral guide portion  130 . 
     The solution receiving body portion  110  is formed in a semi-cylindrical shape in which one surface (a right in  FIG.  1   ) is formed as a planar surface. The flow pipe portion  120  is formed by passing through the inside of the solution receiving body portion  110 , and provides a path through which the CNT solution  10  flows. One side (a top in  FIG.  1   ) of the flow pipe portion  120  is an inlet  121 , and the other side (a bottom in  FIG.  1   ) is an outlet  123 . 
     In order to form the CNT solution  10  flowing in the flow pipe portion  120  having a set inner diameter D as a laminar flow, when the CNT solution  10  flows at a set speed, individual CNTs in the CNT solution  10  are arranged in a longitudinal direction of the flow pipe portion  120  and flow into the flow pipe portion  120 . 
     When a spherical granular lump portion  15  in the CNT solution  10  is separated, it is advantageous as strong a turbulent flow is given to the CNT solution  10 , but in the present invention, the CNT having an elongated linear structure is made as the laminar flow so as to be arranged parallel to the flow of the CNT solution  10 . When the CNT strands are arranged parallel to the flow of the CNT solution  10  by making the laminar flow, it is possible to prevent the CNT strands from being damaged by a shear force generated by the turbulent flow. 
     In order to identify whether the CNT solution  10  flowing through the flow pipe portion  120  is a laminar flow or a turbulent flow, a Reynolds number (Re) is calculated from an equation below. 
     
       
         
           
             
               
                 
                   Re 
                   = 
                   
                     
                       ρ 
                       ⁢ 
                       VD 
                     
                     μ 
                   
                 
               
               
                 
                   [ 
                   Equation 
                   ] 
                 
               
             
           
         
       
     
     where μ refers to a viscosity coefficient of the CNT solution  10 , V refers to a velocity of the CNT solution  10 , D refers to an inner diameter of the flow pipe portion  120 , and ρ refers to a density of the CNT solution  10 . 
     In the CNT solution  10  flowing in the flow pipe portion  120 , the laminar flow is formed when the Reynolds number (Re) calculated by the above equation is about 2,100 or less, and the turbulent flow is formed when the Reynolds number (Re) is 4,000 or more. A zone in which the Re is between 2,000 and 4,000 is called a transition zone. Accordingly, when the viscosity coefficient and density of the CNT solution  10  used are known, the flow of the laminar flow may be obtained by adjusting a diameter of a pipe and a velocity of a fluid. 
     In the present invention, the inner diameter D of the flow pipe portion  120  is set so that the Reynolds number (Re) is 4,000 or less. Accordingly, the CNT solution  10  flowing through the flow pipe portion  120  is formed in the transition zone or as the laminar flow. 
     The spiral guide portion  130  is formed on an inner wall of the flow pipe portion  120  to guide the CNT solution  10  to spirally flow. The spiral guide portion  130  has a left spiral type and a right spiral type alternately formed on the inner wall of the flow pipe portion  120  so that a rotation direction is changed at least twice or more. 
     The spiral guide portion  130  is formed with grooves recessed in or protrusions protruding from the inner wall of the flow pipe unit  120 . The spiral guide portion  130  is spirally formed with the grooves or the protrusions on the inner wall of the flow pipe portion  120 , and thus the CNT solution  10  receives a rotation force while flowing through the inner wall of the flow pipe portion  120  as if a bullet that travels inside a barrel rotates by a steel wire provided inside the barrel. 
     The spiral guide portion  130  formed on the inner wall of the flow pipe portion  120  has the left spiral type and the right spiral type alternately formed to change the rotation direction for each set length. The spiral guide portion  130  includes a first spiral guide portion  131 , a second spiral guide portion  133 , and a third spiral guide portion  135 . 
     The first spiral guide portion  131  is formed in a spiral shape (the right spiral type in  FIG.  1   ) that starts from the inlet  121  and is twisted in one direction. The second spiral guide portion  133  is formed to extend from one side (a bottom in  FIG.  1   ) of the first spiral guide portion  131  and is formed in a spiral shape that is twisted in the other direction (the left spiral type in  FIG.  1   ). The third spiral guide portion  135  is formed to extend from one side (a bottom in  FIG.  1   ) of the second spiral guide portion  133  and is formed in a spiral shape that is twisted in one direction (the right spiral type in  FIG.  1   ). 
     In the present invention, the spiral guide portion  130  including the first spiral guide portion  131 , the second spiral guide portion  133 , and the third spiral guide portion  135  described above are formed on the flow pipe portion  120  so that the rotation direction is changed twice. The CNT solution  10  entering the inlet  121  rotates and moves clockwise (CW) while passing through the first spiral guide portion  131 , and rotates counterclockwise (CCW) while passing through the second spiral guide portion  133  that is a first rotation direction change point. Then, the rotation direction of the CNT solution  10  is changed clockwise (CW) again from the third spiral guide portion  135  that is a second rotation direction change point. 
     The spiral guide portion  130  has the above-described spiral shape in which the left spiral type and the right spiral type are continuously formed alternately, and thus the change in the rotation direction can be increased. 
     The CNT solution  10  is stretched along the spiral guide portion  130  on the inner wall of the flow pipe portion  120  and is alternately twisted between the left spiral type and the right spiral type. Accordingly, the CNT bundle in the CNT solution  10  is loosened like rubbing using hands. 
     A cross-sectional shape of the groove or protrusion of the flow pipe portion  120  may be selected from hemispherical, circular, and polygonal shapes in consideration of the ease of processing and the like. The grooves or protrusions formed on the inner wall of the flow pipe portion  120  rotate the CNT solution  10  flowing through the flow pipe portion  120 . 
     Since the CNT solution  10  flowing from the flow pipe portion  120  along the spiral guide portion  130  flows at a high speed until just before the turbulent flow occurs, the above-described change in the rotation direction applies a large twist kinetic energy to the CNT bundle in the CNT solution  10 . 
     The flow pipe portion  120  includes a straight pipe portion  120   a . The straight pipe portion  120   a  is formed in a straight line toward the outlet  123  at a lower side of the flow pipe portion  120 . The straight pipe portion  120   a  guides the CNT solution  10  to flow linearly toward the outlet  123 . A length of the straight pipe portion  120   a  is formed to be 1D to 20D with respect to the inner diameter D of the flow pipe portion  120 . 
     The ultrasonic vibrator part  200  is mounted on an outer wall of the solution receiving body portion  110  and provides ultrasonic waves to the CNT solution  10 . A plurality of ultrasonic vibrator parts  200  are disposed in the longitudinal direction of the solution receiving body portion  110 . 
     The ultrasonic vibrator part  200  disperses the lump portion  15  of the CNT not dispersed by a Van der Waals force between the CNT strands even with a twist of the flow pipe portion  120  and the spiral guide portion  130  caused by the change in the rotation direction of the CNT solution  10 . 
     The CNT solution  10  flowing along the spiral guide portion  130  receives a twist force while alternating clockwise and counterclockwise. At this time, the CNT solution  10  receives an ultrasonic vibration of the flow pipe portion  120  by the ultrasonic vibrator part  200 . This ultrasonic vibration separates the CNT strands of the CNT solution  10  clumped by a Van der Waals attraction. 
     In other words, the ultrasonic vibrator part  200  receives the ultrasonic vibration in a direction perpendicular to a direction in which the CNT bundles flowing linearly with the flow of the laminar flow inside the flow pipe portion  120  and the spiral guide portion  130  are clumped to receive a force to beat the Van der Waals, and thus the CNT strands are separated. At this time, since the CNT solution  10  including the separated CNTs moves while continuously receiving the twist force alternately clockwise and counterclockwise, the CNT strands once separated are farther away from each other. 
     The ultrasonic vibrator part  200  includes an ultrasonic vibrator body portion  210  and a contact portion  230 . The ultrasonic vibrator body portion  210  accommodates an ultrasonic vibration generation device (not shown) therein. The contact portion  230  has one surface (left in  FIG.  1   ) of the ultrasonic vibrator body portion  210  coming into contact with the outer wall of the solution receiving body portion  110 . 
     When the ultrasonic vibrator is attached to the outer wall of the solution receiving body portion  110  toward the flow pipe portion  120  through which the CNT solution  10  flows, the contact portion  230  is formed to be narrow and long in a direction (vertically in  FIG.  1   ) in which the CNT solution  10  flows in order to intensively apply the ultrasonic vibration to only the flow pipe portion  120 . 
     A width W at which the contact portion  230  comes into contact with the outer wall of the solution receiving body portion  110  is formed to be smaller than the inner diameter D of the flow pipe portion  120  or twice or less the inner diameter D of the flow pipe portion  120 . 
     Since the ultrasonic vibrator part  200  applies ultrasonic waves to the CNT solution  10  flowing through the flow pipe portion  120  and thus all CNTs in the CNT solution  10  flowing through the flow pipe portion  120  evenly receive the ultrasonic force, the ultrasonic waves may evenly irradiate through the entire volume of the fluid passing through the flow pipe portion  120  unlike a method of dispersing a solution around a probe by irradiating ultrasonic waves using an ultrasonic probe within a container, which is a conventional method of dispersing ultrasonic waves, and thus it is possible to obtain a better ultrasonic dispersion effect than that of a conventional ultrasonic dispersion device simply using one ultrasonic probe. 
     The apparatus  1  for dispersing carbon nanotubes according to the present invention further includes a conical dispersion part  300 . The conical dispersion part  300  is mounted inside the outlet  123  of the flow pipe portion  120 . The CNT solution  10  is discharged to the outside of the outlet  123  as it collides with the conical dispersion part  300 . 
     The conical dispersion part  300  includes a conical dispersion body portion  310  and a tip portion  320 . The conical dispersion body portion  310  is formed in a conical shape, is mounted on the outlet  123 , and has an inclined surface that is inclined downward to a bottom of the outlet  123  (based on  FIG.  5   ). The conical dispersion body portion  310  is fixed by a support (not shown) or the like formed to extend from the solution receiving body portion  110 . 
     The tip portion  320  is sharply formed at an end (an upper end in  FIG.  1   ) of the conical dispersion body portion  310 . The tip portion  320  collides with the CNT solution  10  before being discharged through the outlet  123  to loosen the lump portion  15  of the CNT solution  10 . 
     The CNT strands attached to the lump portion  15  in parallel in the CNT solution  10  moving down along the flow pipe portion  120  are loosened by the ultrasonic vibration of the ultrasonic vibrator part  200  and the twist force alternating by the spiral guide portion  130 , but a part of the lump portion  15  not loosened collides with the tip portion  320  while moving down through the straight pipe portion  120   a , and the lump portion  15  itself is loosened by being pulled by a strong flow rate or loosened as the CNT strands are cut by the strong flow rate. 
     In addition, since a sharp end of the tip portion  320  is positioned inside the path of the CNT solution  10 , the CNT solution  10  exits the outlet  123  in a state of having a high pressure and a fast flow rate at the tip portion  320  before exiting the outlet  123 , and at this time, the pressure and flow rate of the fluid are rapidly reduced, so that the lump portion  15  of the CNT can be dispersed from each other, thereby obtaining the dispersion effect. 
     The CNT solution  10  in which the lump portion  15  has been loosened moves down along the inclined surface of the conical dispersion body portion  310 . 
     Referring to  FIGS.  7  and  8   , the carbon nanotube dispersion integration device according to one embodiment of the present invention includes a tank part  20 , a first stirring part  30 , a second stirring part  40 , a first manifold part  50 , and the apparatus  1  for dispersing carbon nanotubes. 
     The tank part  20  receives the CNT solution  10 . The first stirring part  30  stirs the CNT solution  10  by rotating the CNT solution  10  received in the tank part  10 . The second stirring part  40  passes through an inside of the first stirring part  30  and stirs the CNT solution  10  by rotating the CNT solution  10  received in the tank part  20 . 
     The first stirring part  30  includes a first rotary shaft portion  31 , a disk portion  33 , a stirring rod  35 , and a first motor portion  37 . The first rotary shaft portion  31  has an end (a lower end in  FIG.  7   ) submerged in the tank part  20  and is rotated by receiving power from the first motor portion  37 . The first rotary shaft portion  31  is formed in a hollow shape, and a second rotary shaft portion  41  of the second stirring portion  40  is rotatably inserted thereinto. 
     The disk portion  33  is formed in a disk shape installed at the end of the first rotary shaft portion  31  submerged in the tank part  20 . The disk portion  33  is rotated according to the rotation of the first rotary shaft portion  31 . 
     A plurality of stirring rods  35  are mounted on the disk portion  33  in a circumferential direction of the disk portion  33 . In other words, the plurality of stirring rods  35  are disposed in an upright shape to be perpendicular to the rotation direction of the rotating disk portion  33 . 
     The first motor portion  37  transmits power to the first rotary shaft portion  31  to rotate the first rotary shaft portion  31 . 
     As the first rotary shaft portion  31  of the first stirring part  30  configured as described above is rotated, the stirring rod  35  crushes the lump in the CNT solution  10  into small pieces. 
     The second stirring part  40  includes a second rotary shaft portion  41 , a stirring fan portion  43 , and a second motor portion  45 . The second rotary shaft portion  41  is inserted into the first rotary shaft portion  31 , has an end (a lower end in  FIG.  7   ) submerged in the tank part  20 , and is rotated by receiving power from the second motor portion  45 . 
     The stirring fan portion  43  is composed of a plurality of blades installed at the end of the second rotary shaft portion  41  submerged in the tank part  20 . The stirring fan portion  43  is rotated according to the rotation of the second rotary shaft portion  41 . 
     The second motor portion  45  transmits power to the second rotary shaft portion  41  to rotate the second rotary shaft portion  41 . 
     As the second rotary shaft portion  41  of the second stirring part  40  configured as described above is rotated, the stirring fan portion  43  is rotated and crushes the lump in the CNT solution  10  into small pieces together with the stirring rod  35  of the first stirring part  30 . 
     Alternatively, the first stirring part  30  and the second stirring part  40  may be operated together, but may be selectively operated so that any one of the first stirring part  30  and the second stirring part  40  may be operated. 
     The first manifold part  50  communicates with the tank part  20  and receives the CNT solution  10  stirred by the first stirring part  30  or the second stirring part  40 . 
     The apparatus  1  for dispersing carbon nanotubes receives the CNT solution  10  from the first manifold part  50  and disperses the CNT solution  10 . A structure and operation of the apparatus  1  for dispersing carbon nanotubes are replaced with the above description. 
     The second manifold part  60  communicates with the flow pipe portion  120  to receive the dispersed CNT solution  10 . The first manifold part  50  is disposed at a top of the apparatus  1  for dispersing carbon nanotubes (based on  FIG.  7   ), and the second manifold part  60  is disposed at a bottom of the apparatus  1  for dispersing carbon nanotubes (based on  FIG.  7   ). 
     In the present invention, at least one apparatus  1  for dispersing carbon nanotubes is installed between the first manifold part  50  and the second manifold part  60 . A plurality of apparatus  1  for dispersing carbon nanotubes may be disposed between the first manifold part  50  and the second manifold part  60 , and thus more CNT solutions  10  may be dispersed than when dispersed through one apparatus for dispersing carbon nanotubes as the CNT solution  10  supplied from the first manifold part  50  passes through the plurality of apparatus  1  for dispersing carbon nanotubes. 
     The outlet  123  of the apparatus  1  for dispersing carbon nanotubes is connected to the second manifold part  60 , and the dispersed CNT solutions  10  are combined in the second manifold part  60  and go back to the tank part  20 . 
     The second manifold part  60  communicates with the tank part  20  through a pipe, and a pump part  70  is disposed in the middle of the corresponding pipe to transmit the CNT solution  10  discharged from the second manifold part  60  to the tank part. 
     The carbon nanotube dispersion integration device according to the present invention further includes a heat exchange part  80 . The heat exchange part  80  is disposed between the tank part  20  and the first manifold part  50 , and cools the CNT solution  10  to a set temperature. Since the CNT solution  10  may generate heat by the rotation of the first rotary shaft portion  31  of the first stirring part  30  or the second rotary shaft portion  41  of the second stirring part  40 , the CNT solution  10  may be cooled by the heat exchanger  80  in which a coolant flows. 
     Alternatively, the heat exchange part  80  is disposed between the tank part  20  and the first manifold part  50 , and heats the CNT solution  10  to a set temperature. The heat exchange part  80  may be mounted to also supply hot water or steam in addition to the coolant and may heat the circulated CNT solution  10  to the set temperature. 
     The carbon nanotube dispersion integration device according to the present invention further includes the pump part  70 . The pump part  70  causes the CNT solution  10  discharged from the second manifold part  60  to flow to the tank part  20 . The CNT solution  10  dispersed by an operation of the pump part  70  flows to the tank part  20 . The CNT solution  10  returned to the tank part  20  is stirred and dispersed according to set conditions while repeating the above-described operation. 
     According to the present invention, a CNT solution can be formed as a laminar flow while spirally flowing by a spiral guide part of a solution receiving part and dispersed by an ultrasonic vibration of an ultrasonic vibrator part. 
     In addition, according to the present invention, it is possible to loosen a lump portion of the CNT solution by a conical dispersion part installed at an outlet of the solution receiving part. 
     In addition, according to the present invention, a plurality of apparatus for dispersing carbon nanotubes is disposed in parallel to circulate the CNT solution to a tank part, so that it is possible to solve problems such as damage to CNT strands, the difficulty in separating the lump of the CNT, the difficulty in evenly dispersing the entire solution, high manufacturing costs, and an increase in dispersion time, and evenly disperse the CNT solution. 
     While the present invention has been described with reference to one embodiment shown in the drawings, this is only illustrative, and those skilled in the art to which the corresponding technique pertains will understand that various modifications and other equivalent embodiments are possible therefrom. Accordingly, the true technical scope of the present invention should be defined by the appended claims.