Packaging method for carbon nanotube and manufacturing method for carbon nanotube package

Abstract

To provide a packaging method for a carbon nanotubes capable of packaging the carbon nanotube while eliminating inconvenience based of bulk of the carbon nanotube without destroying the structure.SOLUTION: A packaging method for a carbon nanotube includes the steps of: preparing the carbon nanotube and a storage body having an opening for storing the carbon nanotube in the interior and a ventilation port communicating the interior to the exterior; storing the carbon nanotube in the interior of the storage body through the opening and then closing the opening; and discharging air in the interior of the storage body to the exterior through the ventilation port and applying pressure to the interior to disperse and arrange the carbon nanotube, thereby obtaining a carbon nanotube package.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a method for packaging carbon nanotubes and a method for manufacturing a carbon nanotube package.

Background Art

[0002] Carbon nanotubes (hereinafter also referred to as "CNT") have characteristics such as low bulk density and high dispersibility because they contain a large amount of air, and thus the difficulty of handling has been pointed out conventionally. Further, this difficulty in handling is considered to be an obstacle to the practical application of CNT. Japanese Unexamined Patent Application Publication No. 2021-031514 (Patent Document 1) discloses a carbon nanotube compound aggregate having a high bulk density and low dispersibility for the purpose of promoting the practical application of CNT.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In view of the situation where a large amount of CNT is traded as the practical application of CNT progresses, the bulkiness of CNT is disadvantageous from the viewpoint of efficient transportation of CNT, that is, reducing logistics costs. On the other hand, since the bulkiness of CNT is based on a characteristic structure for exhibiting excellent functions such as electrical conductivity, hardness, elasticity, and thermal conductivity, eliminating the bulkiness by destroying the above structure means that the above functions are lost. Therefore, there is a demand for technological development to achieve efficient transportation without destroying the structure of CNT.

[0005] In view of the above circumstances, an object of the present invention is to provide a method for packaging carbon nanotubes and a method for manufacturing a carbon nanotube package that can eliminate the inconvenience based on the bulkiness of carbon nanotubes and perform packaging without destroying the structure.

Means for Solving the Problems

[0006] The present inventors have intensively studied to solve the above problems and have reached the present invention. Specifically, the present inventors focused on efficiently storing a CNT package in a container such as cardboard by degassing the inside of a container containing CNTs and reducing the volume of the inside of the container without destroying the structure of the CNTs. In particular, the present inventors have found that by performing an operation such that the CNTs are dispersedly arranged in the container during degassing of the inside of the container containing the CNTs, the CNT package can be formed into a desired shape, and thus the CNT package can be efficiently stored in the above container, and completed the present invention.

[0007] The present invention relates to a method for packaging carbon nanotubes and a method for manufacturing a carbon nanotube package described below. 〔1〕 A step of preparing a carbon nanotube, a container having an opening for accommodating the carbon nanotube inside, and a vent for communicating the inside and the outside; a step of closing the opening after accommodating the carbon nanotube from the opening into the inside of the container; and a step of obtaining a carbon nanotube package by discharging the air inside to the outside through the vent and applying pressure to the inside to disperse the carbon nanotubes. A method for packaging carbon nanotubes. 〔2〕 The method for packaging carbon nanotubes according to 〔1〕, including a step of reducing the volume of the inside by pressurizing the carbon nanotube package. 〔3〕 The method for packaging carbon nanotubes according to 〔1〕 or 〔2〕, wherein the carbon nanotube is at least one selected from the group consisting of single-walled carbon nanotubes, multi-walled carbon nanotubes, and double-walled carbon nanotubes. 〔4〕The ventilation port has a filter with a mesh, and the mesh size of the mesh is 150 mesh or more and 350 mesh or less. The method for packaging carbon nanotubes according to any one of 〔1〕to 〔3〕. 〔5〕In the step of obtaining the carbon nanotube package, the internal air is discharged to the outside through the ventilation port under a pressure of 0.007 MPa or more and 0.01 MPa or less for a time of 30 seconds or more and 60 seconds or less, and a pressure of 0.08 MPa or more and 0.1 MPa or less is applied to the inside to disperse and arrange the carbon nanotubes. The method for packaging carbon nanotubes according to any one of 〔1〕to 〔4〕. 〔6〕A step of preparing a carbon nanotube, a container having an opening for accommodating the carbon nanotube therein, and a ventilation port for communicating the inside and the outside; a step of closing the opening after accommodating the carbon nanotube into the inside of the container from the opening; and a step of obtaining a carbon nanotube package by discharging the internal air to the outside through the ventilation port and applying a pressure to the inside to disperse and arrange the carbon nanotubes. The method for manufacturing a carbon nanotube package. 〔7〕The method for manufacturing a carbon nanotube package according to 〔6〕, including a step of reducing the volume of the inside by pressurizing the carbon nanotube package. 〔8〕The carbon nanotube is at least one selected from the group consisting of single-walled carbon nanotubes, multi-walled carbon nanotubes, and double-walled carbon nanotubes. The method for manufacturing a carbon nanotube package according to 〔6〕or 〔7〕. 〔9〕The ventilation port has a filter with a mesh, and the mesh size of the mesh is 150 mesh or more and 350 mesh or less. The method for manufacturing a carbon nanotube package according to any one of 〔6〕to 〔8〕. In the step of obtaining the carbon nanotube package, through the vent hole, the internal air is discharged to the outside under a pressure of 0.007 MPa or more and 0.01 MPa or less for a time of 30 seconds or more and 60 seconds or less, and a pressure of 0.08 MPa or more and 0.1 MPa or less is applied to the inside to disperse and arrange the carbon nanotubes, the method for manufacturing a carbon nanotube package according to any one of [6] to [9].

Advantages of the Invention

[0008] According to the present invention, there are provided a method for packaging carbon nanotubes and a method for manufacturing a carbon nanotube package capable of eliminating the inconvenience based on the bulkiness of carbon nanotubes and packaging them without destroying the structure.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Embodiments for Carrying Out the Invention

[0010] Hereinafter, an embodiment according to the present invention (hereinafter also referred to as "the present embodiment") will be described in more detail, but the present invention is not limited thereto. Hereinafter, there may be cases where the description is made with reference to the drawings, but the same or corresponding elements in this specification and the drawings are denoted by the same reference numerals, and the same description thereof will not be repeated.

[0011] In this specification, the notation in the form of "A to B" means the upper and lower limits of the range (i.e., A or more and B or less). When there is no unit description for A and there is a unit description only for B, the units of A and B are the same. The pressure shown in this specification means absolute pressure unless otherwise specified.

[0012] 〔Method for Packaging Carbon Nanotubes (CNT)〕 FIG. 1 is a flowchart for explaining the method for packaging CNTs and the method for manufacturing a CNT package according to this embodiment. As shown in FIG. 1, the method for packaging CNTs according to this embodiment includes a step (hereinafter also referred to as the "preparation step") S10 of preparing CNTs, a container having an opening for accommodating the CNTs therein, and a vent for communicating the inside and the outside; a step (hereinafter also referred to as the "closing step") S20 of closing the opening after accommodating the CNTs from the opening into the inside of the container; and a step (hereinafter also referred to as the "CNT package forming step") S30 of obtaining a carbon nanotube package by discharging the air inside to the outside through the vent and applying pressure to the inside to disperse and arrange the carbon nanotubes. By the method for packaging CNTs having such characteristics, it is possible to package the CNTs by eliminating the inconvenience based on the bulkiness of the CNTs without destroying the structure. As a result, the CNT package can be efficiently stored in a container such as a cardboard box, and there is a possibility of realizing efficient transportation of the CNTs.

[0013] As shown in FIG. 1, the method for packaging CNTs preferably includes a step (hereinafter also referred to as the "volume reduction step") S40 of reducing the volume of the inside by pressurizing the carbon nanotube package. In the volume reduction step S40, it is preferable to pressurize the CNT package at 0.1 MPa or more and less than 1 MPa. In this case, there is a possibility that the inconvenience based on the bulkiness of the CNTs is further eliminated. Hereinafter, each step included in the method for packaging CNTs will be described in more detail.

[0014] <Step (Preparation Step) S10 of Preparing CNTs and a Container> The above CNT packaging method includes a preparation step (preparation step) S10 of preparing a CNT, a container having an opening for accommodating the CNT therein, and a vent for communicating the inside and the outside. The purpose of the preparation step S10 is to prepare an appropriate CNT and container in order to obtain a CNT package in which the CNT is packaged without its structure being destroyed.

[0015] The above CNT is preferably at least one selected from the group consisting of single-walled CNTs, multi-walled CNTs, and double-walled CNTs. That is, the type of CNT applied to the CNT packaging method according to the present embodiment is not particularly limited. The above CNT may be a single-walled CNT, a multi-walled CNT, or a double-walled CNT. Further, in the above CNT packaging method, any one type of CNT selected from the above group may be used alone, or two or more types of CNTs may be used in combination.

[0016] Furthermore, the above CNT may be a powder in which fibrous individuals are aggregated, or an aggregate or granule (see Japanese Patent Application Laid-Open No. 2021-031514, for example, Durobeads (registered trademark)) provided with a function of good dispersibility.

[0017] The above container has an opening for accommodating the CNT therein and a vent for communicating the inside and the outside, and the material, size, shape, etc. are not particularly limited as long as it is a container capable of obtaining the effects of the present invention. For example, as the material used as the above container, a flexible synthetic resin body can be mentioned. Examples of such synthetic resin bodies include various thermoplastic resins, specifically, general-purpose plastics such as polyethylene (PE), polypropylene (PP), and polyvinyl chloride (PVC), or polybutadiene-based synthetic resins such as low-crystalline 1,2-polybutadiene (RB) can be applied as the above container.

[0018] The above opening is not particularly limited, but is formed by, for example, making the above container a bag. The size of the above opening is appropriately selected according to the size of the above container and the amount of the above CNT accommodated in the above interior of the above container. For example, in the case of a container having a volume of 15 L, the above opening can be, for example, a rectangular opening of 460 mm × 50 mm. The above ventilation port is not particularly limited, but it is preferably sized to be suitable for communicating the interior and exterior of the above container made into a bag, for example. The above ventilation port may be, for example, circular with a diameter of about 1 to 2 cm, and may be sized to be suitable for discharging the air inside to the outside in the process of obtaining the CNT package described later.

[0019] In particular, it is preferable that the above ventilation port has a filter with a mesh. The mesh size of the above mesh is preferably 150 mesh or more and 350 mesh or less. By the mesh size of the above mesh being 150 mesh or more, leakage of the above CNT to the outside can be prevented. By the mesh size of the above mesh being 350 mesh or less, clogging by the above CNT can be prevented. The mesh size of the above mesh is more preferably 200 mesh or more and 300 mesh or less. The material of the above filter is not particularly limited, and any of those made of metal, synthetic resin, cloth, and paper are applicable.

[0020] In the preparation step S10, the above CNT and the container may be prepared by a known manufacturing method, or may be prepared by obtaining them from the market.

[0021] <Step of closing the opening (closing step) S20> The above CNT packaging method includes a step (closing step) S20 of closing the above opening after accommodating the above CNT in the above interior of the above container from the above opening. The purpose of the closing step S20 is to prevent the above CNT accommodated in the above interior of the above container from leaking to the outside by closing the opening of the above container.

[0022] In the closing step S20, the opening of the container is closed by known means. For example, the method of closing the opening in the closing step S20 may be a known method such as bonding using an adhesive or bonding by thermocompression bonding.

[0023] FIG. 2 is an image for explaining a method for packaging CNTs and a method for manufacturing a CNT package according to the present embodiment, and (a) is an image for explaining a state in which CNTs are accommodated in the container in the closing step. As shown in FIG. 2(a), according to the closing step S20, after the CNTs are accommodated in the interior of the container, the opening of the container is closed.

[0024] The amount (mass or volume) of the CNTs to be accommodated in the interior of the container is not particularly limited. For example, the mass of the CNTs per liter of the volume of the container may be 30 to 150 g, and preferably 65 to 135 g. Thus, an amount of the CNTs that can be appropriately dispersed and arranged inside and can reduce transportation costs can be accommodated in the container.

[0025] <Step of obtaining a CNT package (CNT package forming step) S30> The method for packaging the CNTs includes a step (CNT package forming step) S30 of obtaining a carbon nanotube package by discharging the internal air to the outside through the vent and applying pressure to the inside to disperse and arrange the carbon nanotubes. In particular, in the CNT package forming step S30, it is preferable to discharge the internal air to the outside through the vent for 30 seconds or more and 60 seconds or less at a pressure of 0.007 MPa or more and 0.01 MPa or less, and apply a pressure of 0.08 MPa or more and 0.1 MPa or less to the inside to disperse and arrange the carbon nanotubes. The purpose of the CNT package forming step S30 is to form a CNT package that can be efficiently stored in a container such as cardboard by discharging the internal air to reduce the volume inside the container while adjusting the external shape of the container by dispersing and arranging the CNTs inside the container.

[0026] In the CNT package forming step S30, the specific means for dispersing and arranging the CNTs inside the container are as follows. That is, the means is to discharge the air inside to the outside through the vent hole under a pressure of 0.007 MPa or more and 0.01 MPa or less for a time of 30 seconds or more and 60 seconds or less. At the same time, a pressure of 0.08 MPa or more and 0.1 MPa or less is applied to the inside to disperse and arrange the carbon nanotubes. More specifically, the means is to make the gauge pressure inside -0.1 MPaG or more and -0.08 MPaG or less while discharging the air inside to the outside through the vent hole at the above-mentioned pressure and time, thereby applying a pressure of 0.08 MPa or more and 0.1 MPa or less to the CNTs inside. As a result, the CNTs that were accommodated in an uneven shape as a whole inside are flattened as a whole by the individual CNTs moving up, down, left, and right, etc. Thus, the CNTs can be dispersed and arranged without being localized inside. In this case, since excessive stress is not applied to the CNTs, the characteristic structure of the CNTs is maintained without being destroyed inside.

[0027] The pressure for discharging the air inside to the outside through the vent hole is preferably 0.008 MPa or more and 0.01 MPa or less, more preferably 0.009 MPa or more and 0.01 MPa or less from the viewpoint of efficiency. The time for discharging the air inside to the outside through the vent hole is preferably 30 seconds or more and 50 seconds or less, more preferably 30 seconds or more and 40 seconds or less from the viewpoint of efficiency. In the CNT package forming step S30, it is preferable that the gauge pressure inside is -0.1 MPaG or more and -0.095 MPaG or less, and more preferably -0.1 MPaG or more and -0.09 MPaG or less.

[0028] Figure 2(b) is an image for explaining the state in which CNTs are dispersedly arranged within the container due to degassing of the interior at a predetermined pressure or the like in the CNT package formation step. As shown in Figure 2(b), according to the CNT package formation step S30, the CNTs are dispersedly arranged within the interior by being flattened as a whole within the interior through predetermined degassing and pressurization.

[0029] Note that after completion of the CNT package formation step S30, it is necessary to close (seal) the vent in order to prevent external air or the like from entering the interior. However, according to the CNT packaging method, it is not necessary to immediately seal the vent after completion of the CNT package formation step S30. This is because, even if a pressure difference occurs between the interior and the exterior of the CNT package, the entry of external air or the like into the interior is inhibited to some extent due to the individual fibrous shapes or the like of the CNTs. In particular, according to the CNT packaging method, the vent can be sealed after completion of the volume reduction step S40 described later.

[0030] <Operation> The CNT packaging method according to the present embodiment includes the above-described preparation step S10, closing step S20, and CNT package formation step S30, whereby a CNT package in which the characteristic structure of the CNTs is maintained without being destroyed within the interior of the container can be obtained. Thus, the CNT packaging method according to the present embodiment can reduce the transportation cost of CNTs by enabling efficient storage of the CNT package in a container such as a cardboard box.

[0031] <Step of reducing the interior volume (volume reduction step) S40> The above CNT packaging method preferably includes a step (volume reduction step) S40 of reducing the volume of the interior by pressurizing the above CNT package. In particular, in the volume reduction step S40, it is preferable to pressurize the above CNT package at 0.1 MPa or more and less than 1 MPa. The purpose of the volume reduction step S40 is to further reduce the volume of the interior by applying a pressure to the above CNT package that does not destroy the structure of the above CNT, and to form a CNT package that can be efficiently stored in a container such as cardboard. This may make it possible to further eliminate the inconvenience based on the bulkiness of the above CNT.

[0032] The specific method of the volume reduction step S40 is not particularly limited as long as it is a method capable of applying a pressure to the above CNT package that does not destroy the structure of the CNT within the range of 0.1 MPa or more and less than 1 MPa. The interior may be reduced in volume by manually pressurizing the above CNT package, or the interior may be reduced in volume by pressurizing using a known device, equipment, etc. capable of applying pressure.

[0033] Figure 2(c) is an image explaining the CNT package whose volume has been reduced in the volume reduction step. As shown in Figure 2(c), according to the volume reduction step S40, the above CNT package becomes a shape that can be efficiently stored in a container such as cardboard due to the reduction in volume of the interior of the above container.

[0034] 〔Method for manufacturing CNT package〕 As shown in Figure 1, the method for manufacturing a CNT package according to this embodiment includes a step (preparation step) S10 of preparing a CNT, a container having an opening for accommodating the above CNT inside, and a vent for communicating the inside and the outside, a step (closing step) S20 of closing the above opening after accommodating the above CNT from the above opening into the above interior of the container, and a step (CNT package forming step) S30 of obtaining a carbon nanotube package by discharging the air inside to the outside through the above vent and applying pressure to the inside to disperse and arrange the above carbon nanotubes.

[0035] The method for manufacturing the CNT package can specifically obtain the CNT package by going through a preparation step, a closing step, and a CNT package forming step in the same manner as the above-described CNT packaging method. Therefore, by the method for manufacturing the CNT package, a CNT package in which CNTs are packaged can be obtained while eliminating the disadvantages based on the bulkiness of the CNTs without destroying the structure. As a result, there is a possibility that efficient transportation of CNTs can be realized by efficiently storing the CNT package in a container such as cardboard.

[0036] Regarding the method for manufacturing the CNT package, the description overlapping with the above-described CNT packaging method will not be repeated. The method for manufacturing the CNT package is the same as the above-described CNT packaging method in that by including a volume reduction step S40, the disadvantages based on the bulkiness of the CNTs can be further eliminated.

Example

[0037] Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited by these examples. In the following description, Sample 1 to Sample 2 are examples, and Sample A to Sample B are comparative examples.

[0038] 〔Manufacture of CNT Package〕 <Sample 1> (Preparation Step) As the CNT, granulated material (product name: "Durobeads 1102", manufactured by Nakatani Sangyo Co., Ltd.) containing multi-walled carbon nanotubes (MWCNT) was prepared. As the container, it was prepared by producing a rectangular parallelepiped bag made of polyethylene having a size of length 460 mm × width 640 mm × height 50 mm (volume of about 15 L). The above container had an opening with a width of 640 mm and a depth of 50 mm. Further, the container had a vent hole with a diameter of 10 mm on the surface. A filter made of nylon and having a mesh of 200 meshes was provided at this vent hole.

[0039] (Closing Step) After accommodating 1 kg of the above CNT from the above opening into the inside of the above container, the above opening was closed by thermocompression bonding.

[0040] (CNT Package Formation Step) Through the vent of the container containing the above CNT, the air inside was discharged to the outside under a pressure of 0.085 MPa or less for 45 seconds. Further, by setting the gauge pressure inside to -0.1 MPaG or more and -0.08 MPaG or less, the above CNT was pressurized. As a result, the above CNT was dispersed and arranged without being localized inside the above container. Thus, the required number of CNT packages of Sample 1 was obtained.

[0041] <Sample 2> In the preparation step, except for preparing a granulated product (manufactured by Nakatani Sangyo Co., Ltd.) containing 97% by mass of multi-walled carbon nanotubes (MWCNT) and 3% by mass of single-walled carbon nanotubes (SWCNT) as the CNT, the required number of CNT packages of Sample 2 was obtained in the same manner as Sample 1.

[0042] <Sample A> Except for not performing the CNT package formation step, the required number of CNT packages of Sample A was obtained in the same manner as Sample 1.

[0043] <Sample B> (Volume Reduction Step) With respect to the CNT package of Sample 1, by using a commercially available table press to pressurize at 1 MPa, the internal volume was reduced to 40% by volume compared to the volume of the CNT package of Sample A, and the required number of CNT packages of Sample B was obtained.

[0044] [Evaluation of CNT Package] (Efficiency Evaluation) It was evaluated how many CNT packages of Sample 1 to Sample 2 and Samples A to B could be stored in a cardboard box with a length of 450 mm × width of 600 mm × height of 450 mm, respectively. As a result, 15 of Sample 1 to Sample 2 were stored in the above cardboard box. On the other hand, 6 of Sample A were stored in the above cardboard box. 14 of Sample B were stored in the above cardboard box.

[0045] (Evaluation of whether the structure of CNT is maintained) 1) Evaluation using the Effective Defiberization Index (EDI) Regarding the CNTs contained in the CNT packages of Sample 1 to Sample 2 and Samples A to B, it was evaluated whether the structure was maintained without being destroyed by using the Effective Defiberization Index (EDI). The above EDI is an index developed by the present inventors and is an index representing the ease of defiberization (ease of unwinding) of CNTs. According to the research of the present inventors, it has been clarified that the easier the CNTs are defiberized (that is, the value of the above EDI), the more the structure of the CNTs is maintained without being destroyed. In this example, when the above EDI is 70 or more, the CNTs of the sample to be evaluated are evaluated to have their structure maintained without being destroyed. The procedure for calculating the above EDI was as follows. The unit of the above EDI is mass%.

[0046] In each sample (Sample 1 to Sample 2 and Samples A to B), about 100 g of CNTs were weighed respectively to obtain the first sample of each sample. The first sample was passed through a sieve with an aperture of 2000 μm, and the mass of the CNTs remaining on the sieve (A(2000)) was measured. Next, the CNTs that passed through the sieve with an aperture of 2000 μm were passed through a sieve with an aperture of 1000 μm, and the mass of the CNTs remaining on the sieve (A(1000)) was measured. Subsequently, the CNTs that passed through the sieve with an aperture of 1000 μm were passed through a sieve with an aperture of 500 μm, and the mass of the CNTs remaining on the sieve (A(500)) was measured. Finally, the mass of the CNTs that passed through the sieve with an aperture of 500 μm (A(FN)) was measured. Also, the sum of A(2000), A(1000), A(500), and A(FN) was defined as the total mass of the first sample (A(ttl)).

[0047] Next, 5 g of CNTs remaining on a sieve with an aperture of 1000 μm out of the above-mentioned first sample of each sample was weighed to obtain a second sample of each sample. The second sample was put onto a newly prepared sieve with an aperture of 1000 μm together with 45 g of glass beads with a diameter of 2 mm. In this state, the sieve was shaken under the conditions of an amplitude of 0.5 mm and a vibration time of 1 minute, and the mass of CNTs passing through the sieve (AR(1000)) was measured. Further, the first pulverization rate (F(1000)) was obtained by dividing AR(1000) by 100.

[0048] 5 g of CNTs remaining on a sieve with an aperture of 500 μm out of the above-mentioned first sample of each sample was weighed to obtain a third sample of each sample. The third sample was put onto a newly prepared sieve with an aperture of 500 μm together with 45 g of glass beads with a diameter of 2 mm. In this state, the sieve was shaken under the conditions of an amplitude of 0.5 mm and a vibration time of 1 minute, and the mass of CNTs passing through the sieve (AR(500)) was measured. Further, the second pulverization rate (F(1000)) was obtained by dividing AR(500) by 100.

[0049] The values of A(2000), A(1000), A(500), A(ttl), F(1000), and F(500) obtained as described above were substituted into the following formula (1) to obtain EDI (mass%).

[0050]

Equation

[0051] 2) Evaluation using the dispersion particle size of N-methyl-2-pyrrolidone (NMP) Regarding the CNTs contained in the CNT packages of each sample (Sample 1 to Sample 2 and Sample A to Sample B), whether the structure was maintained without being destroyed was evaluated based on the following criteria by measuring the dispersion particle size with a Hegman type particle size meter model 232 (manufactured by DKSH Japan) using N-methyl-2-pyrrolidone (NMP, manufactured by Mitsubishi Chemical Corporation). A: The NMP dispersion particle size is less than 20 μm and the dispersibility is good. B: The NMP dispersion particle size is 60 μm or more and the dispersibility is poor.

[0052] A list of the types of CNTs used in each sample (Sample 1 to Sample 2, and Sample A to Sample B) and the evaluation results of each sample is shown in Table 1.

[0053]

Table 1

[0054] 〔Discussion〕 As can be understood from Table 1, compared with the CNT package of Sample A, more CNT packages of Sample 1 to Sample 2 were stored in the cardboard box. In that case, it was also confirmed that the CNTs packaged in the CNT packages of Sample 1 to Sample 2 had high values of EDI and NMP dispersion particle size and the structure was maintained, similar to Sample A. The CNT package of Sample B had more CNTs stored in the cardboard box than Sample A, but it was presumed that at least part of the structure of the CNTs was destroyed. From the above, it was suggested that the CNT packages of Sample 1 to Sample 2 can achieve efficient transportation of CNTs.

[0055] As described above, the embodiments and examples of the present invention have been explained. However, it was also initially planned that the configurations of the above-described embodiments and examples may be appropriately combined.

[0056] The embodiments and examples disclosed this time should be considered as illustrative in all respects and not restrictive. The scope of the present invention is shown not by the above description but by the claims, and it is intended that all modifications within the meaning and scope equivalent to the claims are included.

Explanation of Signs

[0057] S10 Preparation step, S20 Closing step, S30 CNT package forming step, S40 Volume reduction step.

Claims

1. A step of preparing a carbon nanotube, a container having an opening for accommodating the carbon nanotube therein, and a vent for communicating the inside and the outside; A step of closing the opening after accommodating the carbon nanotube into the inside of the container from the opening; A step of obtaining a carbon nanotube package by discharging the air inside to the outside through the vent and applying pressure to the inside to disperse the carbon nanotubes, the method for packaging carbon nanotubes comprising the steps.

2. The method for packaging carbon nanotubes according to claim 1, further comprising a step of reducing the volume of the inside by pressurizing the carbon nanotube package.

3. The method for packaging carbon nanotubes according to claim 1 or 2, wherein the carbon nanotube is at least one selected from the group consisting of single-walled carbon nanotubes, multi-walled carbon nanotubes, and bilayer carbon nanotubes.

4. The vent has a filter with a mesh; The method for packaging carbon nanotubes according to claim 1 or 2, wherein the mesh size of the mesh is 150 mesh or more and 350 mesh or less.

5. In the step of obtaining the carbon nanotube package, the air inside is discharged to the outside through the vent at a pressure of 0.007 MPa or more and 0.01 MPa or less for 30 seconds or more and 60 seconds or less, and a pressure of 0.08 MPa or more and 0.1 MPa or less is applied to the inside to disperse the carbon nanotubes, the method for packaging carbon nanotubes according to claim 1 or 2.

6. A step of preparing a carbon nanotube, a container having an opening for accommodating the carbon nanotube therein, and a vent for communicating the inside and the outside; A step of closing the opening after accommodating the carbon nanotube into the inside of the container from the opening; A step of obtaining a carbon nanotube package by discharging the air inside to the outside through the vent and applying pressure to the inside to disperse the carbon nanotubes, the method for manufacturing a carbon nanotube package comprising the steps.

7. The method for manufacturing a carbon nanotube package according to claim 6, further comprising a step of reducing the volume of the inside by pressurizing the carbon nanotube package.

8. The method for manufacturing a carbon nanotube package according to claim 6 or claim 7, wherein the carbon nanotube is at least one selected from the group consisting of single-walled carbon nanotubes, multi-walled carbon nanotubes, and double-walled carbon nanotubes.

9. The vent has a filter with a mesh, The method for manufacturing a carbon nanotube package according to claim 6 or claim 7, wherein the mesh size of the mesh is 150 mesh or more and 350 mesh or less.

10. In the step of obtaining the carbon nanotube package, the internal air is discharged to the outside through the vent at a pressure of 0.007 MPa or more and 0.01 MPa or less for a time of 30 seconds or more and 60 seconds or less, and a pressure of 0.08 MPa or more and 0.1 MPa or less is applied to the inside to disperse and arrange the carbon nanotubes. The method for manufacturing a carbon nanotube package according to claim 6 or claim 7.

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