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CN-122029315-A - Method for producing carbon nanotube fiber, apparatus for producing carbon nanotube solidified material, and system for producing carbon nanotube fiber

CN122029315ACN 122029315 ACN122029315 ACN 122029315ACN-122029315-A

Abstract

A carbon nanotube fiber (C3) is produced using a carbon nanotube-solidified body production apparatus (2) for producing a carbon nanotube-solidified body (C2). A device (2) for producing a carbon nanotube solidified material is provided with a groove (21) and a jig (22). The tank (21) accommodates a coagulation liquid (L). The jig (22) has a support plate portion (221). The clamp (22) is movable between a1 st position and a2 nd position. In a state where the jig (22) is located at the 1 st position, the support plate portion (221) is located in the coagulation liquid (L). In a state where the jig (22) is located at the 2 nd position, the support plate portion (221) is located above the coagulation liquid (L). The support plate part 221 has a hole 2210 in which the upper surface S is opened. The manufacturing method comprises a step (1), a step (2) and a step (3). In the step (1), a carbon nanotube dispersion liquid (C1) containing carbon nanotubes and a dispersion medium is ejected onto a support plate portion (221) of a jig (22) located at the 1 st position, thereby producing a carbon nanotube solidified body (C2). In the step (2), the jig (22) is moved from the 1 st position to the 2 nd position, and the solidification liquid (L) on the upper surface (S) of the support plate (221) is discharged from the hole (2210). In the step (3), the carbon nanotube-coagulated body is dried.

Inventors

  • Suzuki Chisatoshi
  • NAKAMURA MASAICHI
  • MASAFUMI OKAMOTO

Assignees

  • 日东电工株式会社
  • 国立大学法人奈良先端科学技术大学院大学

Dates

Publication Date
20260512
Application Date
20241009
Priority Date
20231018

Claims (16)

  1. 1. A method for producing a carbon nanotube fiber by using a device for producing a carbon nanotube solidified body, wherein, The apparatus for producing a carbon nanotube solidified material comprises: A tank for storing a coagulating liquid, and A jig having a support plate portion movable between a1 st position in which the support plate portion is located in the coagulation liquid and a2 nd position in which the support plate portion is located above the coagulation liquid, The support plate portion has a hole whose upper surface is opened, The manufacturing method comprises the following steps: A step (1) of ejecting a carbon nanotube dispersion liquid containing carbon nanotubes and a dispersion medium onto the support plate portion of the jig located at the 1 st position to produce the carbon nanotube solidified body; a step (2) of moving the jig from the 1 st position to the 2 nd position and discharging the solidification liquid on the upper surface of the support plate from the hole, and And (3) drying the carbon nanotube solidified body.
  2. 2. The method for producing a carbon nanotube fiber according to claim 1, wherein the coagulating liquid contains water.
  3. 3. The method for manufacturing a carbon nanotube fiber according to claim 1, wherein an area ratio of the holes of the upper surface of the support plate portion is less than 70%.
  4. 4. The method for producing a carbon nanotube fiber according to claim 1, wherein a contact angle of the solidification liquid with respect to the upper surface of the support plate portion is 30 degrees or more and less than 100 degrees.
  5. 5. The method for producing a carbon nanotube fiber according to claim 1, wherein the dispersion medium is hydrophilic.
  6. 6. The method for producing a carbon nanotube fiber according to claim 1, wherein the specific gravity of the dispersion medium is greater than 1.
  7. 7. The method for producing a carbon nanotube fiber according to claim 1, wherein the carbon nanotube content in the carbon nanotube dispersion is 0.3 mass% or more and 2.0 mass% or less.
  8. 8. The method for producing a carbon nanotube fiber according to claim 1, wherein, In the step (1), the carbon nanotube dispersion liquid is discharged from a discharge port, In the step (1), the support plate portion is moved relative to the ejection port in a direction along the upper surface.
  9. 9. The method for producing a carbon nanotube fiber according to claim 1, wherein the jig has a concave portion opened upward, The bottom plate of the recess is the support plate portion.
  10. 10. The method for producing a carbon nanotube fiber according to claim 1, wherein the hole is a through hole penetrating the support plate portion.
  11. 11. A device for manufacturing a carbon nanotube-solidified body, which is a device for manufacturing a carbon nanotube-solidified body, wherein, The apparatus for producing a carbon nanotube solidified material comprises: A tank for storing a coagulating liquid, and A jig having a support plate portion for ejecting a carbon nanotube dispersion liquid containing carbon nanotubes and a dispersion medium, the jig being movable between a1 st position in the solidification liquid and a 2 nd position in the solidification liquid, The support plate portion has a hole whose upper surface is opened.
  12. 12. The apparatus for producing a carbon nanotube solidifying body according to claim 11, wherein an area ratio of the holes of the upper surface of the support plate portion is less than 70%.
  13. 13. The apparatus for producing a carbon nanotube solidified material according to claim 11, further comprising an ejection device having an ejection port for ejecting the carbon nanotube dispersion liquid, The support plate portion is relatively movable with respect to the ejection port in a direction along the upper surface.
  14. 14. The apparatus for producing a carbon nanotube solidifying body according to claim 13, wherein the jig has a concave portion opened upward, The bottom plate of the recess is the support plate portion.
  15. 15. The apparatus for producing a carbon nanotube solidified material according to claim 13, wherein the hole is a through hole penetrating the support plate portion.
  16. 16. A system for manufacturing carbon nanotube fibers, comprising: the carbon nanotube-solidified material manufacturing apparatus according to claim 13 or claim 14, and And a drying device for drying the carbon nanotube solidified body on the support plate portion.

Description

Method for producing carbon nanotube fiber, apparatus for producing carbon nanotube solidified material, and system for producing carbon nanotube fiber Technical Field The present invention relates to a method for producing carbon nanotube fibers, an apparatus for producing carbon nanotube solidified material, and a system for producing carbon nanotube fibers. Background There is known a method of producing a spun yarn-like CNT by ejecting a carbon nanotube dispersing agent (CNT dispersing agent) containing Carbon Nanotubes (CNTs) and a dispersing medium into a container for accommodating a condensed liquid, and then drying the spun yarn-like CNT (for example, see patent document 1 below). In the manufacturing method described in patent document 1, while holding one end portion of spun CNT extending in the longitudinal direction, spun CNT is lifted from the condensed liquid, and the condensed liquid contained in the spun CNT and the condensed liquid around the spun CNT are removed. Prior art literature Patent literature Patent document 1 WO2018/047882 Disclosure of Invention Problems to be solved by the invention However, in the method described in patent document 1, when the spun yarn CNT is lifted from the condensed liquid, the spun yarn CNT may be broken due to the weight of the condensed liquid. On the other hand, if the spun yarn CNT is slowly lifted up to suppress the breakage, the manufacturing efficiency is lowered. The invention provides a method for manufacturing carbon nanotube fibers, an apparatus for manufacturing carbon nanotube coagula, and a system for manufacturing carbon nanotube fibers, wherein breakage of the carbon nanotube coagula is suppressed and reduction of manufacturing efficiency is suppressed. Means for solving the problems The invention [1] comprises a method for producing a carbon nanotube fiber by using a carbon nanotube-solidified body producing apparatus, wherein the carbon nanotube-solidified body is produced by ejecting a carbon nanotube dispersion liquid containing a carbon nanotube and a dispersion medium onto the support plate portion located at the 1 st position, the carbon nanotube-solidified body is produced by moving the support plate portion between the 1 st position in the solidified liquid and the 2 nd position above the solidified liquid, the support plate portion having a hole with an upper surface thereof opened, and the method comprises a step (2) of moving the support plate portion from the 1 st position to the 2 nd position, discharging the solidified liquid on the upper surface of the support plate portion from the hole, and (3) drying the carbon nanotube. In this manufacturing method, in the step (2), the clamp is moved from the 1 st position to the 2 nd position while supporting the carbon nanotube solidified body with the upper surface of the support plate portion, so that the solidified liquid on the upper surface of the support plate portion is discharged from the hole, and therefore, breakage of the carbon nanotube solidified body at the time of discharge of the solidified liquid is suppressed, and a reduction in manufacturing efficiency can be suppressed. The invention [2] includes the method for producing a carbon nanotube fiber according to [1], wherein the coagulating liquid contains water. The invention [3] includes the method for producing a carbon nanotube fiber according to [1] or [2], wherein the area ratio of the holes in the upper surface of the support plate portion is less than 70%. In this manufacturing method, since the area ratio of the holes in the upper surface of the support plate portion is less than 70%, the carbon nanotube solidified material can be reliably adhered to the upper surface of the support plate portion in the step (3). Therefore, breakage of the carbon nanotube fiber in the step (3) can be suppressed. The invention [4] includes the method for producing a carbon nanotube fiber according to any one of [1] to [3], wherein a contact angle of the solidification liquid with respect to the upper surface of the support plate portion is 30 degrees or more and less than 100 degrees. In this manufacturing method, since the contact angle of the solidification liquid to the upper surface of the support plate portion is 30 degrees or more, releasability is ensured when the carbon nanotube fibers are recovered from the support plate portion, and breakage due to adhesion of the carbon nanotube fibers to the support plate portion can be suppressed. Since the contact angle of the coagulation liquid with respect to the upper surface of the support plate portion is less than 100 degrees, the wettability of the coagulation liquid with respect to the upper surface of the support plate portion can be improved, and therefore the carbon nanotube coagulation can be reliably adhered to the upper surface of the support plate portion. As a result, breakage due to shrinkage of the carbon nanotube fiber can be suppressed. The invention [5] compr