JP4237381B2 - Vapor growth carbon fiber filling and method for producing vapor growth carbon fiber filling - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vapor-grown carbon fiber filler and a method for producing the vapor-grown carbon fiber filler. More specifically, the present invention is easy to handle and easily returns to its original volume after a lapse of time after the applied pressure is removed. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vapor-grown carbon fiber filler that can be returned and a method by which such vapor-grown carbon fiber filler can be easily manufactured.
[0002]
[Prior art and problems to be solved by the invention]
There is a vapor-grown carbon fiber called carbon nanofiber because it has a small diameter compared to a vapor-grown carbon fiber having a large diameter. The aggregate of carbon nanofibers is generally very bulky (low bulk density) immediately after its production.
[0003]
The bulky carbon nanofiber aggregates are transported because the amount of carbon nanofibers contained per unit volume is small, and the transport efficiency is poor. In order to increase the transport efficiency, it is necessary to increase the bulk density of the aggregate of carbon nanofibers. However, if the aggregate of carbon nanofibers with low bulk density is compressed in a container and then the compressive force is removed to cover the container, the entire aggregate of carbon nanofibers that have been compressed immediately expands. End up. In other words, the aggregate of carbon nanofibers compressed in the container swells in a short period of time from when the applied pressure is removed until the container is capped, so the container is fully loaded with the lid. In order to do so, there is a restriction that the cap must be applied very quickly after the pressure is removed.
[0004]
In addition, even if a container filled with carbon nanofibers can be quickly loaded with a lid within a very short time, the next time the lid is removed from the container, the carbon nanofibers in the container will be restored. There is a problem of not restoring the bulk density. For example, when an aggregate of carbon nanofibers having an average fiber diameter of 20 nm and an aspect ratio of 50 or more is pressurized at about 10 MP in a dry state and then the pressure is released, the compressed carbon nanofibers Although the aggregate swells, its bulk density is 0.03 g / cm^ThreeRestored only to a certain extent. When the carbon nanofiber aggregate is pressurized at about 50 MP and then the pressure is released, the compressed carbon nanofiber aggregate expands but its bulk density is 0.05 g / cm.^ThreeRestored only to a certain extent. As described above, when the aggregate of carbon nanofibers is once pressurized and then the pressure is released, the original bulk density is not restored because part of the carbon nanofibers is broken by the pressurization. Conceivable.
[0005]
In addition, even if a composite material formed by dispersing carbon nanofibers that are broken and shorter than before pressurization is dispersed in a synthetic resin, the composite material does not exhibit good conductivity. There is also a point.
[0006]
By the way, when the carbon nanofiber is used for a specific application, various surface treatments may be performed after the carbon nanofiber is manufactured. From an industrial point of view, it is desired that carbon nanofibers directed to a specific application be manufactured with as few steps as possible.
[0007]
  An object of the present invention is to solve the aforementioned problems. That is, the object of the present invention is to be filled with a bulk density that is large enough to enable efficient transportation and storage, and even if the applied pressure is removed, it does not immediately return to the original bulk density. Return to a bulk density that is substantially the same as or close to the original bulk density.Can be used easily for the following purposesIt is to provide a carbon nanofiber filling.
[0008]
Another object of the present invention is to provide a method capable of easily producing the carbon nanofiber filler.
[0009]
[Means for Solving the Problems]
  This invention for solving the above-mentioned problems contains vapor-grown carbon fibers having an average diameter of 3 to 200 nm, and is 0.1 to 0.5 g / cm in the presence of a liquid.^ThreeCompressed to bulk densityAnd the bulk density is restored by removing the liquid.A vapor-grown carbon fiber filling characterized by
  Vapor growth carbon fiber having an average diameter of 3 to 200 nm and a liquid of 0.1 to 0.5 g / cm at 0.2 to 50 MPa.^ThreeCompressed to bulk densityThe bulk density is restored by filling the airtight container and removing the liquid.It is a manufacturing method of the said vapor growth carbon fiber filler characterized by the above-mentioned.
[0010]
  Furthermore, this invention for solving the said subject contains vapor-phase growth carbon fiber with an average diameter of 3-50 nm, and 0.1-0.5 g / cm in presence of a liquid.^ThreeCompressed to bulk densityAnd the bulk density is restored by removing the liquid.A vapor-grown carbon fiber filling characterized by
  A predetermined amount of vapor-grown carbon fiber having an average diameter of 3 to 50 nm is compressed with a liquid at 0.2 to 50 MPa.The bulk density is restored by filling the airtight container and removing the liquid.A method for producing the vapor-grown carbon fiber fillerAnd
It is a manufacturing method of the vapor growth carbon fiber filler whose said liquid is water and / or alcohol.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
The vapor-grown carbon fiber filler according to the present invention is an aggregate of vapor-grown carbon fibers filled in the presence of a liquid with a predetermined pressure in a predetermined closed space, for example, in a container. Even if the applied pressure is removed, the vapor-grown carbon fiber having the original bulk density does not immediately return to the aggregate of vapor-grown carbon fibers, and after the predetermined pressure is removed, the vapor-grown carbon fiber having the original bulk density is passed. It has the property of returning to the aggregate of Therefore, for example, immediately after the pressure applied by the pressurizing means applied to the vapor growth carbon fiber filled in the container is removed, the opening of the container can be simply covered with a closing member, for example, When the lid is removed, the filling of the vapor grown carbon fiber that has been filled in the container so far expands to return to the aggregate of vapor grown carbon fibers having the original bulk density. Therefore, since the vapor-grown carbon fiber filling according to the present invention is filled in a closed space such as a container with a large bulk density, efficiency of transportation and storage is achieved, and post-treatment of vapor-grown carbon fiber such as The surface treatment of the vapor growth carbon fiber can be performed efficiently.
[0012]
The vapor-grown carbon fiber, which is an element of the aggregate called the vapor-grown carbon fiber filler, has a predetermined average diameter, and is compressed and filled in a closed space such as a container with a predetermined bulk density.
[0013]
Furthermore, the vapor-grown carbon fiber according to the present invention has an average diameter of 3 to 200 nm, preferably 3 to 50 nm. In other words, an aggregate of vapor grown carbon fibers having an average diameter in the range of 3 to 50 nm is preferable as the vapor grown carbon fiber filler. Aggregates of vapor-grown carbon fibers having an average diameter in the range of 3 to 50 nm can achieve the object of the present invention particularly well.
[0014]
However, the vapor-grown carbon fiber having an average diameter of 50 to 200 nm or less by allowing the vapor-grown carbon fiber having a larger diameter to be contained in the aggregate of vapor-grown carbon fibers having an average diameter of 3 to 50 nm. It is also possible to use the aggregate of the vapor-grown carbon fiber filler in the present invention.
[0015]
Here, the average diameter of the vapor growth carbon fiber is arbitrarily selected from 100 or more fibers from a photograph obtained at a magnification of 30,000 times or more with a scanning microscope (SEM) or a transmission microscope (TEM), It can be calculated by measuring and averaging the outer diameter of the fiber.
[0016]
The vapor grown carbon fiber has an aspect ratio usually not lower than 50, preferably not lower than 100. This aspect ratio is an average value. Similar to the measurement of the average diameter of the vapor-grown carbon fiber, the diameter and outer diameter of 100 or more fibers are arbitrarily measured from a photograph obtained at a magnification of 30,000 times or more with a scanning microscope or a transmission microscope. And can be calculated by averaging.
[0017]
When the aspect ratio is at least 50, in combination with the normal average diameter of the vapor-grown carbon fiber, when the vapor-grown carbon fiber is dispersed and mixed in a base material such as resin and ceramic, the conductivity is good. To express.
[0018]
Vapor-grown carbon fibers having an average diameter of 3 to 200 nm, particularly 3 to 50 nm are disclosed in, for example, JP-B-60-54998, JP-B62-49363, JP-B-5-36521, and JP-A-9- It can be produced by the methods described in Japanese Patent No. 324325, Japanese Patent Laid-Open No. 9-78360, and the like.
[0019]
Generally speaking, vapor-grown carbon fibers are produced as follows. That is, by introducing a catalytic metal source such as an organic transition metal compound such as ferrocene and a carbon source such as hydrocarbon, carbon dioxide or carbon monoxide into a reaction region heated to a high temperature such as 900 to 1200 ° C. A catalytic metal is produced, and carbon generated by the decomposition of the carbon source is grown on the surface of the catalytic metal. The growth of carbon on the surface of the catalytic metal is performed in one direction and also in the direction perpendicular to the direction, that is, in the thickness direction. That is, the growth of carbon from the catalyst metal toward the axial direction of the vapor grown carbon fiber, that is, the length growth, and the growth in the direction in which the thickness of the vapor grown carbon fiber increases, that is, the thickness growth occur. At this time, by controlling the thickness growth and selecting the conditions that give priority to the length growth, it is possible to produce a suitable ultrafine vapor grown carbon fiber in the present invention.
[0020]
In the present invention, the vapor grown carbon fiber is filled in a closed space such as a container. There is no restriction | limiting in particular as a container, What is necessary is just a container with the closed space filled with vapor growth carbon fiber. Moreover, there is no restriction | limiting in particular also about the use and function of the container. Suitable containers include containers such as cans used to store or transport vapor grown carbon fibers.
[0021]
Since the vapor-grown carbon fiber filler filled by the method of the present invention described later contains a liquid, when the liquid-containing vapor-grown carbon fiber filler is continuously stored in the container for a long period of time, When the liquid is volatilized, the vapor-grown carbon fiber filling will return to the original aggregated state before compression, so that the container may be a pressure resistant container such as a metal can such as a drum can, a pail can. Such as plastic cans can be used. In addition, as long as the vapor-grown carbon fiber filling contains liquid, it does not return to the original vapor-grown carbon fiber aggregate before compression as described above, so even if the pressure resistance is not as high as that of a metal can. A container with low pressure resistance may be used as long as it can be hermetically sealed.
[0022]
Further, when the vapor-grown carbon fiber filler is further graphitized while being filled in a container, the container is required to have heat resistance. An example of such a container is a graphite container.
[0023]
In the present invention, the vapor grown carbon fiber is filled in a closed space such as a container. The applied pressure at the time of filling is 0.2 to 40 MPa (2 to 400 kg / cm²), Preferably 0.5-20 MPa (5-200 kg / cm²), More preferably 1-10 MPa (10-100 kg / cm²).
[0024]
When the applied pressure is within the above range and the average diameter of the vapor grown carbon fiber is within the above range, the bulk density of the vapor grown carbon fiber is 0.1 to 0.5 g / cm.^ThreeWithin the range of. If the applied pressure is larger than the above range, the vapor-grown carbon fiber may break, and the aspect ratio may decrease, and as a result, the electrical conductivity of the composite material may decrease.
[0025]
On the other hand, when the applied pressure is smaller than the above range, the bulk density of the vapor grown carbon fiber is not increased, resulting in a bulky vapor grown carbon fiber, and the efficiency of transportation or the like is lowered.
[0026]
Examples of the method for applying the pressing force include a technique using a press apparatus as shown below.
[0027]
As shown in FIG. 1, the pressing device 6 is formed in a cylindrical shape having an axial line in the vertical direction, and communicates with the piston insertion path 7 provided along the axial direction and the piston insertion path 7. A mold 3 including a container insertion path 4 provided in a direction orthogonal to the axial direction, a moving container 13 inserted into the container insertion path 4 and disposed immediately below the piston insertion path 7; A bottom mold 11 that is inserted into the container insertion path 4 and arranged immediately below the piston insertion path 7 is formed so as to be able to advance and retreat in the piston insertion path 7 and is inserted into the piston insertion path 7. And a piston 2 that presses the phase-grown carbon fiber into the moving container 13.
[0028]
As shown in FIGS. 1 and 2, the mold 3 is disposed and fixed on a press table 5 supported by a press frame 1 that is erected. The container insertion path 4 is formed by notching the upper surface, which is the surface of the press table 5, the lower end surface of the mold 3, and the opposed vertical inner wall parallel to the axis of the mold 3, and orthogonal to the axis. And a through-hole 8 that is a space provided in a direction perpendicular to the axis of the mold 3 at the lower end of the mold 3. The interval between the vertical inner walls facing each other in the through-hole 8 is designed to be a dimension that allows the bottom mold 11 to move.
[0029]
An opening of the piston insertion path 7 is opened on the ceiling surface of the through hole 8, whereby the piston insertion path 7 and the container insertion path 4 communicate with each other.
[0030]
The bottom mold 11 is put in and out of the container insertion path 4. The bottom mold 11 includes, for example, an upper end surface having a diameter sufficient to close the opening. When the bottom mold 11 is disposed in the container insertion path 4 so as to close the opening, the upper end surface of the bottom mold 11 becomes a bottom surface in a cylindrical space formed by the piston insertion path 7. .
[0031]
The bottom mold 11 can be moved back and forth in the container insertion path 4 so that the opening can be closed or opened by appropriate bottom mold advance / retreat driving means (not shown). It has become.
[0032]
The movable container 13 can be inserted into the container insertion path 4, and the vapor grown carbon fiber loaded in the piston insertion path 7 when the movable container 13 is located immediately below the opening. Has an upper opening and an internal shape that are sufficient to be able to be dropped from the piston insertion path 7 into the moving container 13 without hindrance. Therefore, in many cases, the moving container 13 is a circular bottomed cylindrical body having an upper opening. In addition, the inner diameter of the movable container 13 which is a bottomed cylindrical body is designed to be substantially the same as or slightly larger than the diameter of the opening so as not to be smaller than the diameter of the opening.
[0033]
The piston 2 is fitted in the piston insertion path 7 so as to be able to advance and retract. The piston 2 can be advanced and retracted by a hydraulic cylinder attached to the upper frame of the press frame 1. In the figure, reference numeral 12 denotes a support rod attached to the bottom mold 11, which couples the bottom mold advancing / retreating drive means for moving the bottom mold 11 back and forth.
[0034]
Using the press device 6 having the above-described configuration, the vapor growth carbon fiber filler is manufactured as follows.
[0035]
As shown in FIG. 3, the bottom mold 11 is disposed in the container insertion path 4 so as to close the opening of the piston insertion path 7. A collection 14 of vapor-grown carbon fibers is loaded into the piston insertion path 7. During this loading, the liquid described later is added to the aggregate 14 of vapor grown carbon fibers. A liquid may be added to the vapor-grown carbon fiber assembly 14 loaded in the piston insertion path 7, but the vapor-grown carbon fiber and the liquid are mixed in advance in an appropriate container. The mixture may be loaded into the piston insertion path 7. As shown in FIG. 4, the piston 2 compresses the gas-grown carbon fiber aggregate 14 loaded in the piston insertion path 7. As shown in FIG. 5, pressurization by the piston 2 is stopped. In FIG. 5, the piston 2 is removed from the piston insertion path 7, but it is not always necessary to remove the piston 2 from the piston insertion path 7, and vapor phase growth is performed so that the vapor growth carbon fiber is not compressed. The piston 2 may be simply separated from the carbon fiber aggregate 14. Next, as shown in FIG. 6, the bottom mold 11 is removed from the container insertion path 4, the moving container 13 is inserted into the container insertion path 4, and the moving container 13 is positioned immediately below the opening. Even if the bottom mold 11 is moved from directly below the opening, the compressed vapor-grown carbon fiber generates a force that tends to spread toward the inner peripheral surface of the piston insertion path 7. The aggregate of the grown carbon fibers remains in the piston insertion path 7 even if the bottom mold 11 does not exist therebelow. Thereafter, as shown in FIG. 7, the compressed aggregate of the vapor growth carbon fibers compressed by lowering the piston 2 in the piston insertion path 7 is pushed down toward the moving container 13, and the vapor growth carbon fibers are obtained. The compressed assembly is filled into the moving container 13. At this time, the vapor-grown carbon fiber aggregate 14 transferred into the moving container 13 is further pressed by the piston 2, whereby the vapor-grown carbon fiber aggregate 14 is moved into the piston 2 in the movable container 13. You may compress and fill with. As shown in FIG. 8, the moving container 13 filled with the vapor-grown carbon fiber aggregate 14 is taken out from the container insertion path 4. By covering the moving container 13 taken out from the container insertion path 4, the vapor growth carbon fiber filling filled in the moving container 13 is obtained.
[0036]
In the present invention, the liquid is added to the vapor grown carbon fiber when the vapor grown carbon fiber loaded in the container is pressurized with the applied pressure. This liquid is a liquid under normal temperature and normal pressure, and preferably has a viscosity of 30 N · s / cm.²It is a liquid that does not exceed (300 poise). Specifically, examples of the liquid include organic solvents, organic solvent solutions, water, and aqueous solutions. Examples of the organic solvent include polar solvents such as alcohols and ketones, aromatic organic solvents such as benzene, toluene and xylene, and petroleum solvents such as ligroin and petroleum ether.
[0037]
Among the various liquids, lower alcohols such as ethanol and ketones such as acetone penetrate well between the vapor-grown carbon fibers and are easy to remove at the time of use of the vapor-grown carbon fibers. preferable. Also, petroleum such as kerosene and heavy oil, ethylene glycol, and the like are convenient for filling the vessel with vapor grown carbon fiber for a long period of time. This is because even if the aggregate of the vapor growth carbon fiber filler is stored together with these liquids in the container over a long period of time, these liquids do not volatilize or volatilize. This is because no pressure is applied to the container to return the aggregate. Further, the vapor grown carbon fiber present together with these liquids is advantageous in this respect because it is not necessary to use an oil agent when dispersed in a base material such as rubber.
[0038]
Examples of the organic solvent solution include an organic solvent such as a mixed solution of alcohols and water. When only organic solvents are used as liquids, organic solvents are often flammable, so mixed packing of organic solvents and vapor-grown carbon fibers is dangerous as a flammable material. It is safe to reduce its flammability. In some cases, either water or an organic solvent can be employed as the liquid.
[0039]
The type of liquid to be selected at the time of pressurization is appropriately determined depending on the content and application of post-treatment applied to the vapor-grown carbon fiber that has been subjected to the pressure treatment.
[0040]
Examples of the method of adding a liquid to the vapor grown carbon fiber include a spraying operation, a liquid spraying operation, and an operation of immersing and stirring the vapor grown carbon fiber in a liquid.
[0041]
As post-treatment applied to the vapor-grown carbon fiber after the pressure treatment, once the graphite vessel is pressurized and filled with ethanol, the ethanol is evaporated and removed, and the filling density of the vapor-grown carbon fiber in the graphite vessel is reduced. There is graphitization treatment in which heat treatment is performed at 2000 to 3000 ° C. in a high state.
[0042]
In this invention, the addition amount of the liquid with respect to 1 part by weight of the vapor-grown carbon fiber is usually 0.3 to 3 parts by weight, preferably 0.5 to 2 parts by weight. When the added amount is within the above range, even after the pressure is released, the bulk is not restored immediately after the pressure is released. Further, when the container is filled and sealed within the above range, the compressed state is easily maintained. Even if the liquid is increased unnecessarily, the effect remains unchanged and the weight only increases, which is meaningless.
[0043]
The temperature at which the vapor-grown carbon fiber is pressurized with the applied pressure is appropriately selected within a temperature range in which the added liquid does not evaporate, volatilize or volatilize.
[0044]
Further, although the pressurizing time depends on the amount of vapor grown carbon fiber, it is usually sufficient to be about several seconds to 1 minute. When pressurizing an aggregate of vapor-grown carbon fibers, it is preferable to repeat the pressurization operation so that the pressurization time is shortened and the predetermined packing density is reached many times, rather than extending the pressurization time.
[0045]
As described above, the vapor grown carbon fiber according to the present invention contains a predetermined amount of vapor grown carbon fiber having a predetermined average diameter in a container, and after adding a liquid, the gas is grown with a predetermined pressure. When the aggregate of phase-grown carbon fibers is pressed, the bulk density is 0.1 to 0.5 g / cm.^Three, Preferably 0.1 to 0.4 g / cm^ThreeWill be filled.
[0046]
The use of the vapor grown carbon fiber according to the present invention filled in a specific bulk density as described above is as described above.
[0047]
【Example】
Example 1
150 g of ethanol was spray-added to 150 g of carbon nanofibers (ultra-fine vapor-grown carbon fibers) having an average diameter of 20 nm and an average aspect ratio of at least 100 when loaded in a container having an internal volume of 20 liters. Immediately after the spray addition, the opening of the container was covered to form a sealed container, and the sealed container was shaken to thoroughly mix the vapor-grown carbon fiber inside and the liquid to obtain a mixture.
[0048]
Next, the mixture was divided into 5 equal parts in a cylinder having an inner diameter of 136 mm and a height of 200 mm, and 980.665 × 10^-FourPa (100 kg / cm²The mixture in the cylinder (bottom mold) was compressed and pressurized several times with a piston with a pressing force of). As a result, the compressed mixture was transferred to a graphite container having an inner diameter of 140 mm and a height of 60 mm while applying a slight pressure. This operation was repeated 5 times to fill the graphite container with the compressed mixture, and then the opening of the graphite container was covered. The lid has a through-hole 8 having a diameter of 3 mm at the center, and is screwed into the opening of the graphite container with a groove screw.
[0049]
The bulk density of the vapor growth carbon fiber in this graphite container is 0.19 g / cm.^ThreeMet.
[0050]
Sixteen samples prepared under the above conditions were prepared.
[0051]
All 16 samples were placed in a 100 ° C. vacuum dryer and left overnight. When the 16 samples were cooled after being allowed to stand and then the lids of the two samples were opened, the carbon nanofibers in each of them swollen to 5 liters or more and returned to their original bulky state.
[0052]
The above experimental fact is that if a liquid is present when filling the vapor-grown carbon fiber in the container, the vapor-grown carbon fiber is smoothly filled into the container, but the container is filled with the vapor-grown carbon fiber. When the liquid in the container afterwards disappears due to volatilization or the like, the aggregate of vapor-grown carbon fibers filled and compressed exhibits a restoring force that tends to be bulky.
[0053]
The remaining 14 samples were heat-treated at 2800 ° C. for 30 minutes in argon. As a result, the carbon nanofibers in the container were graphitized. Even when the lid of the container was removed, the graphitized carbon nanofibers did not swell and remained inside the container.
[0054]
The crystal structure of the carbon nanofiber before graphitization was not perfect, but the carbon nanofiber after graphitization had almost perfect crystal structure.
[0055]
(Example 2)
After taking out the graphitized carbon nanofibers from each of the 14 containers and gently squeezing them, a water / ethanol (50:50 volume ratio) mixture is added at a rate of 80 g per 50 g of the graphitized carbon nanofibers. 147.09995 × 10 with a press that matches the diameter of the can^-FourPa (15 kg / cm²) Was compressed into a disk shape. Thereafter, the compressed product was put into a round can. A total of about 2 kg of graphitized carbon nanofibers were put in a round can, and the whole was lightly compressed. Then, a foamed polystyrene packing equivalent to about 2 liters was sandwiched between them and the lid was sealed. This round can was filled with 2 kg of graphitized carbon nanofibers and 3.2 kg of a water / ethanol mixed solution. Carbon nanofibers have a bulk density of about 0.25 g / cm^ThreeIt is.
[0056]
When the inside of the container was observed after the passage of one month, there was no abnormality in the appearance of the round can. When the lid was removed, the graphitized carbon nanofibers were slightly raised, but they were not wet and scattered.
[0057]
(Comparative Example 1)
An attempt was made to fill the graphite container with carbon nanofibers in the same manner as in Example 1 except that ethanol was not used, but the graphite container was about 40 g (0.05 g / cm 2).^Three) I couldn't pack more.
[0058]
(Example 3)
Carbon nanofibers were placed in a 10-liter container in the same manner as in Example 1 except that 3.2 kg of carbon nanofibers having an average diameter of about 45 nm and an average aspect ratio of at least 100 and 6.8 kg of ethanol were used. When filled, the bulk density is about 0.40 g / cm.^ThreeMet.
[0059]
【The invention's effect】
According to the present invention, it is possible to provide a vapor-grown carbon fiber filled with a high bulk density without losing conductivity, and producing a vapor-grown carbon fiber filled with a high bulk density. A method can be provided.
[0060]
In addition, according to the present invention, when the pressure of the vapor grown carbon fiber filler is released, the bulk is restored over time, and can be easily used for the next use.
[0061]
According to the present invention, the aggregate of vapor-grown carbon fibers can be compressed and filled to a large bulk density, so that the vapor-grown carbon fiber aggregate can be transported, transferred, transported and stored efficiently.
[Brief description of the drawings]
FIG. 1 is a schematic schematic explanatory view showing the front of a press apparatus as an example for carrying out a method according to the present invention.
FIG. 2 is a schematic explanatory diagram when a press device as an example for carrying out the method according to the present invention is viewed from above.
FIG. 3 is a schematic explanatory view showing a state in which an aggregate of vapor-grown carbon fibers is loaded into a mold in the press apparatus shown in FIG. 1;
FIG. 4 is a schematic explanatory view showing a state in which an aggregate of vapor growth carbon fibers loaded in a mold in the press apparatus shown in FIG. 1 is pressurized with a piston.
FIG. 5 is a schematic explanatory view showing a state in which a piston is separated from an aggregate of vapor growth carbon fibers compressed in a mold in the press apparatus shown in FIG. 1;
6 is a schematic explanatory view showing a state in which a moving container is arranged immediately below an aggregate of vapor-grown carbon fibers compressed in a mold in the press apparatus shown in FIG. 1. FIG. .
7 is a schematic explanatory view showing a state in which an aggregate of vapor-grown carbon fibers compressed in a mold in the pressing apparatus shown in FIG. 1 is pushed into a moving container by a piston. FIG.
FIG. 8 is a schematic explanatory view showing a state in which the vapor growth carbon fiber loaded in the moving container in the pressing apparatus shown in FIG. 1 is taken out from the pressing apparatus together with the moving container.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Press frame, 2 ... Piston, 3 ... Type | mold, 4 ... Container insertion path, 5 ... Press stand, 6 ... Press apparatus, 7 ... Piston insertion path, 8 ... Through-hole, 11 ... Bottom mold | type, 12 ... Support rod, 13 ... moving container, 14 ... aggregate of vapor grown carbon fiber.

Claims (5)

Containing vapor-grown carbon fibers having an average diameter of ³ to 200 nm, compressed to a bulk density of 0.1 to 0.5 g / cm ^{3 in} the presence of a liquid , filled in an airtight container, and removing the liquid Vapor growth carbon fiber filling, wherein the bulk density is restored by The vapor-grown carbon fiber filler according to claim 1, wherein the vapor-grown carbon fiber has an average diameter of 3 to 50 nm.   Vapor growth carbon fiber with an average diameter of 3 to 200 nm is 0.1 to 0.5 g / cm at 0.2 to 50 MPa with liquid. ^Three A method for producing a vapor-grown carbon fiber filler, wherein the bulk density is restored by removing the liquid after compressing to a bulk density of The method for producing a vapor-grown carbon fiber filler according to claim 3, wherein the vapor-grown carbon fiber has an average diameter of 3 to 50 nm. The method for producing a vapor-grown carbon fiber filler according to claim 3 or 4, wherein the liquid is water and / or alcohols.

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