JPS6312759A - Highly conductive fiber and its production - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention provides highly conductive a useful material for functional composite materials.
It relates to fibers and their manufacturing methods, and can be applied to conductive paints, inks, composite materials for electroplating, radio wave shielding materials, etc.

(Conventional technology) With the development of science and technology and the diversification of needs, the development of high-performance, multifunctional materials has been actively conducted, and even in the plastics industry, various research efforts have been made on the development of conductive polymer materials. For example, carbon particles or fibers or copper,
Polymer materials using metal powders such as silver and gold as conductive fillers have been proposed. However, carbon NI1. When used as fillers other than fibers, they all had the disadvantage of poor reinforcing properties.

Carbon A fibers are a reinforcing conductive filler, but it is difficult to make the fiber length uniform and the aspect ratio becomes uneven, resulting in poor moldability and surface slippage of D-shaped products. It has poor hardness and abrasiveness.

In view of the above-mentioned circumstances, expectations have been placed on the development of conductive alkali titanates with excellent heat resistance and reinforcing properties as a means of improving the shortcomings of already known fillers. Alkali, carbon vapor deposition, metal oxide coating methods, and the like have been proposed, but at present no material with a volume resistivity of less than 10 −2 Ω·cm has been obtained other than metal coating.

Incidentally, the present inventor has already disclosed in VF 1985-135129 that a mixture consisting of an alkali titanate and a carbon substance is heated in a reducing or inert atmosphere, and then heated and fired at 500 to 1300°C. We proposed a method for producing reduced alkali titanate, and in the technology for producing conductive alkali titanate utilizing the usefulness of hydrocarbon compounds and high carbon-containing fossil components disclosed in the prior art, we have proposed a method for producing reduced alkali titanate. When the carbon-containing fossil component is fired with an alkali titanate, it reduces the alkali titanate and decomposes in a non-oxidizing atmosphere, forming a carbonaceous film on the surface of the alkali metal titanate, forming a black conductive titanate. Alkali was obtained.

However, in these prior art applications, alkali titanate was used as an auxiliary means to develop conductivity by being reduced. In recent years, as needs have diversified and performance has improved, the development of highly conductive reinforcing materials is desired, and the development of materials with excellent reinforcing properties and conductivity is desired. However, in the prior art, when a hydrocarbon compound that is a gas at room temperature is used, the contact with potassium titanate is homogeneous and a carbon film can be formed simultaneously with the reduction of the alkali titanate, but the specific gravity of the hydrocarbon gas In an open kiln with a small
The gas flows out with the atmospheric gas, raising the gas concentration to a high concentration, but it requires long-term firing, and in the former case, a large amount of free carbon is produced in addition to the carbon film, and if used as is, the reinforcing properties will be significantly reduced, and free carbon will be released. It is necessary to remove carbon, and in the latter case, a closed kiln will be used, but unless the internal pressure is reduced to prevent hydrocarbon gas from leaking, it will explode and catch fire.
However, the conductivity of the conductive alkali titanate obtained in this way is at most 10-2Ω・c.
Only a volume resistivity of about m was obtained.

As an improvement method of these prior art, we investigated various conditions for forming a carbonaceous film at the same time as reducing the alkali titanate.We found that the alkali titanate was left still in a furnace, brought into contact with a carbon material, and then heated in a non-oxidizing atmosphere. In the firing method, using components that are liquid or solid at room temperature and vaporize under heating has better reaction efficiency and reduces the risk of explosion, etc. than when using carbon substances that are gaseous at room temperature. Although the reduction of alkali titanate proceeded homogeneously, some free carbon was produced, and the utilization efficiency of the carbon material was insufficient. It became clear that it required a highly skilled technique.

(Problems to be Solved by the Invention) The object of the present invention is to provide a highly conductive a
Our objective is to provide fibers and methods for their production.

(Means for Solving the Problems) The present invention provides a highly conductive ts whose surface of a fibrous component is coated with a coating mainly composed of carbonaceous material and whose volume resistivity is less than 10-''Ω・am; Regarding m, this highly conductive fiber is produced by constantly supplying a fibrous component to a heating and firing furnace, for example, and fibrous component 1
After introducing the aromatic hydrocarbon component from the vaporization chamber to 10 to 100 parts by weight per 100 parts by weight,
It is obtained by firing at 00 to 1100'C.

In the present invention, the WL fibrous component is one that has an N&fiber shape with an aspect ratio (ratio of elongation to fiber diameter) of 10 or more, and has excellent heat resistance because it is fired in a non-oxidizing atmosphere. are generally selected from inorganic a-fibers,
4i 4I Et is 1 u m due to the fact that it is fired in a heating and firing furnace and its workability when used as a composite material.
-300m+, b"11m The diameter is preferably about 10μm-1mm. If the fiber diameter is too small, the reinforcing effect will be insufficient, and if the fiber diameter is too thin, it will take a lot of effort to defibrate.
This is because when used as a material for composite materials, moldability and homogeneity decrease, the 7 spectral ratio decreases, and reinforcing properties tend to be insufficient. fiber, carbon fiber, silicon carbide fiber, silicon nitride fiber, zirconia fiber,
Boron nitride fiber, boron carbide fiber, titanium boride fiber,
Examples include boron fibers, beryllium oxide fibers, alkali metal titanate fibers, and alkaline earth metal titanate fibers.

In the fibrous component of the present invention, sodium titanate a,
Regarding alkali titanate fibers exemplified as W, lithium titanate fiber, potassium titanate M&fiber, etc., potassium titanate an, among them 2o.6 T i O2
Potassium hexatitanate fiber represented by has excellent fire resistance, heat insulation, and mechanical strength, and when used as a filler,
The product has excellent surface smoothness. α is advantageous, and those with a fiber length of 5 μm or more and an aspect ratio of 20 or more, particularly 100 or more are suitable as reinforcing fillers.

The aromatic hydrocarbon component of the present invention includes, for example, mononuclear aromatic hydrocarbons such as benzene, toluene, and xylene, polynuclear aromatic hydrocarbons such as naphthalene and anthracene, and each of the 81 derivatives of the above-mentioned various hydrocarbons. Pressure: 300℃
These are vaporized or sublimed below, and these 111 or a mixture of two or more are used.

A non-oxidizing atmosphere refers to maintaining a non-oxidizing atmosphere by introducing a reducing gas or an inert γ gas. Examples of the reducing gas include hydrogen gas, carbon oxide gas, ammonia gas, etc. Typically, nitrogen gas is used, but argon, helium, xenon, other inert gases, and even carbon dioxide gas can also be used. can be introduced into the system as a mixed gas of
Indicates an atmosphere that has been replaced by more than % by volume.

In the present invention, the fibrous component is constantly supplied to a heating and firing furnace, the vaporized aromatic hydrocarbon and the fibrous component are transferred under homogeneous contact, and the target highly conductive fiber is produced by firing in a non-oxidizing atmosphere. is obtained.

An example of a suitable heating and firing furnace is a rotary firing type rotary kiln, but a cylindrical firing furnace equipped with a mechanism for transporting the fibrous component by a rotating shaft with feeding blades inside the furnace can also be used; The feeder blades tend to cause turbulent flow in the firing furnace, and aromatic hydrocarbons tend to thermally decompose on the surface of the feeder blades and abnormally precipitate, resulting in free carbon, which requires skill in control.

In addition, in the present invention, an inclined firing furnace can also be used by processing the supplied Wl and m components into granules by spray drying, etc., without making any special modifications to the heating furnace. Granulated MILm.

By supplying the quality components, the conductive fiber of the present invention can be manufactured more easily.

Any commonly used method for granulating the fibrous component can be used, but the particle size should be in the range of 10 μm to 51 mm, preferably 50 μm to 1 mm; if the particle size is too small, the fibers will become too entangled, resulting in a composite material. When used as a dispersion, it is difficult to obtain a homogeneously defibrated dispersion, and conversely, if it is too large, heat conduction during firing and contact with atmospheric gas become uneven, making it difficult to obtain a homogeneous product.

In the granulation process, any commonly used granulation aid can be used to bind the fibrous components; When granulated with, for example, wl, there is an effect of promoting the formation of a carbonaceous film on the surface of the joint surface.

One of the points to be kept in mind when carrying out the present invention is the decomposition temperature of hydrocarbons and the temperature at which they adhere to fibrous components. The decomposition temperature of hydrocarbons differs depending on the type, and the optimum temperature range for carbon precipitation and the optimum temperature range for adhesion to fibrous components vary depending on the type of hydrocarbon used. For example, in the case of methane, the carbon precipitation temperature range is approximately 900 to 950°C, and n
- In the case of propane, it is about 950-1000°C. In the case of benzene, the temperature is low and carbon precipitates at about 750 to 800°C.

However, in most experiments, these precipitation temperatures were observed using static measuring instruments, and no consideration has been given to the relationship between precipitation temperature and adhesion characteristics5. Although precipitation is observed, free carbon also precipitates. In developing highly conductive fibers with carbonaceous coatings, it was important to improve adhesion efficiency and analyze adhesion characteristics.

When gaseous hydrocarbons such as methane and propane are used as the hydrocarbon compound, the manufacturing process is simplified if the disadvantages of ignition and explosion due to leakage and increased contact ratio are accepted.i! However, the adhesion to the fibrous surface was insufficient even when examined under various conditions. Note that among aromatic hydrocarbons that are liquid or solid at room temperature and require vaporization B'11N, for example, benzene has a carbon precipitation temperature of 750 to 750°C.
It was known that carbon precipitates at 800°C, a lower temperature than aliphatic hydrocarbon gas, but vaporization 8! Even if it is fired to the above-mentioned carbon precipitation temperature, the static method has the disadvantage that, like other gas carbonization methods, a large amount of free carbon is precipitated, reducing the smoothness of the fiber surface. Ta.

As a result of various studies on the carbon precipitation mechanism of benzene, the present inventor found that when benzene is fired in a non-oxidizing atmosphere,
We discovered that benzene polymerizes and changes into various compounds depending on the firing conditions, and that these polymers adhere to the fiber surface to form a homogeneous conductive carbon film. It became clear that the carbon did not adhere to the surface and became free carbon. Furthermore, these carbonization 8! From the elucidation of the structure, it is necessary to perform firing at a higher temperature than the conventionally discussed carbon precipitation temperature.If an aromatic hydrocarbon, which is a benzene derivative, is used as a starting material, the firing conditions do not differ much depending on the type of raw material, and the firing temperature is 800 to 1100'. It has been found that carbonization of aromatic hydrocarbons can be completed by passing through a temperature range of C, preferably a temperature range of 900° C. or higher.

In the method of the present invention, aromatic hydrocarbons serving as a carbon source are effectively used, so the amount used is reduced. The aromatic hydrocarbon component is preferably in the range of 10 to 1000 parts by weight per 100 parts by weight of the components.

The present invention does not preclude the use of a catalyst that promotes the decomposition of aromatic hydrocarbons and the adhesion of a.
Such catalysts include one or a mixture of two or more of compounds such as manganese, molybdenum, tungsten, boron, iron, nickel, and cobalt, as well as chlorides, oxides,
hydroxides, nitrates, sulfates, and even metal alcoholades,
Organometallic salts such as alkyl acetonates can be used. The most effective way to use these catalysts is to homogeneously mix them with the fibrous components.When granulating by spray drying etc., add them during the granulation process so that the fibrous components and the catalyst It is best to use a homogeneously mixed granulated product.

In the present invention, as a means for transferring the vaporized aromatic hydrocarbon and the fibrous component under homogeneous contact, the aromatic hydrocarbon and the fibrous component are homogeneously mixed with each other, and the mixture is constantly placed in the preheating section of the heating and firing furnace. By supplying aromatic hydrocarbons, the aromatic hydrocarbons are vaporized, and in the subsequent firing process, the vaporized aromatic hydrocarbons and the fibrous components can be brought into homogeneous contact, but the most effective method is to use a vaporization chamber, This is a method in which aromatic hydrocarbons are vaporized in advance and introduced into a heating and calcining furnace using an inert gas as a carrier.In a method that uses a vaporization chamber, a vaporization chamber is placed in front of the introduction part of the heating and calcining furnace, and the aromatic hydrocarbon is There is a method of bringing the vaporized hydrogen component and the fiber component into co-current contact (abbreviated as the co-current contact method) and the counter-current contact method described below. In the former, the mixing ratio of the vaporized aromatic hydrocarbon component and the fiber component is Although the control is accurate, the contact efficiency between the aromatic hydrocarbon and the fibrous component is slightly lowered, and the active ingredient consisting of the thermopolymerized aromatic hydrocarbon according to the present invention is not fully utilized, resulting in It may be excreted together with other substances.

In the present invention, as a means to improve such drawbacks of the co-current contact method, aromatic With the effective use of hydrocarbon components, a dense carbonaceous film was formed and highly conductive fibers were obtained.

In the present invention, apart from the cocurrent contact method, a method can also be used in which a vaporization chamber is provided at the rear and the vaporized aromatic hydrocarbon component and the fibrous component are brought into contact with each other in countercurrent flow (abbreviated as countercurrent contact method). In the flow contact method, the vaporized components of aromatic hydrocarbons and the aluminous components are brought into contact efficiently, but the polymerized aromatic hydrocarbons may migrate to the part where the aluminous components are introduced into the heating and calcining furnace. 900 to 1000 around the center of the heating and firing furnace.
``C for several minutes to promote carbonization of the above-mentioned polymer, this carbide becomes a nucleus, and as the a vertebral component moves, the vaporized component of the newly supplied aromatic hydrocarbon. It is possible to promote contact carbonization, form a dense carbonaceous film on the surface of M&fibers, and obtain highly conductive! However, even in the countercurrent contact method, novel aromatic carbonization occurs near the exit of the heating and firing furnace. Although there is a risk of moisture contamination due to contact with vaporized components of hydrogen, in order to form a stable carbonaceous film during production of the conductive fiber of the present invention, contact with air is required at a relatively low temperature, preferably 200°C or higher. It is desirable to prevent this from occurring, so it is recommended to heat and sinter an inert gas and introduce it into the furnace immediately after the post-cooling stage, that is, immediately after the introduction of the aromatic hydrocarbon vaporized components, to vaporize and separate the aromatic hydrocarbon components. .

The exhaust gas obtained in this way can be effectively used by reintroducing it into the vaporization chamber.

By the method described above, in the present invention, conductive fibers exhibiting excellent conductivity with a volume resistivity of always 10°Ω·ate or less can be obtained homogeneously, and furthermore, a volume resistivity of 10 Highly conductive #& fibers of less than -2 Ω·cm can also be obtained.

The apparatus for manufacturing highly conductive I and miscellaneous materials according to the present invention will be described below with reference to the drawings.

Figure 1a shows the front part of the pre-fired kiln and its attached equipment.
Figure b shows the rear part of the pre-calcination furnace and its attached equipment. Figure 2-a shows the front part of the post-loading kiln and its attached equipment.
1) The figure shows the rear part of the post-load kiln and its attached equipment. In the figure: 1. aromatic hydrocarbon; 2. vaporizer.

3. Inert gas introduction pipe, 4. Condenser, 5. Receiver.

6. Connector, 7. Gas introduction pipe, 8. protection tube.

9. Sealing material, 10. Sliding part, 110 rotation rotation axis 2
, drive unit, 13. Firing furnace, 14. Inlet.

15, #t! L wandering substance injector, 16. connecting pipe.

17.18. Open/close valve, 19. Gas release pipe.

20. Inert gas inlet; 21. Take-out port.

22. On-off valve, 23. Stocker, 24. Gas release pipe.

25. Protection tube, 26. Condenser, 270 recovery vessel.

28, an airtight sliding connection device.

(1) The dispersion of wet-fibrillated fibrous components is spray-dried in an inert gas, then subjected to a classification process, and then connected to a pipe that is air-flow-transferred using an inert gas (]6), (2) A connecting pipe (16) for connecting the granulated fibrous component spray-dried in an inert gas to the air-flow-transferred product, (3) Textile 41T raw material, classified product, and granulated product. etc., are mixed with inert gas and replaced with inert gas in the preliminary room so that the remaining air amount is 10% or less, and then the connecting pipe with the one transferred with the inert gas ( 16) The fibrous component transferred by any of the above methods passes through the fibrous component injector (15) and enters the firing furnace body (13), which has been adjusted to a predetermined temperature and non-oxidizing atmosphere, through the inlet (
14). The charger (15) and the charge port (14) are equipped with on-off valves that operate in conjunction with the rotation of the firing furnace, and are also equipped with a device to prevent unnecessary air from entering.

Aromatic hydrocarbons (1) are stored in a vaporizer (2), and an inert gas is continuously introduced from an inlet pipe (3) through a coupler (6) to a gas inlet pipe (7). ), and is continuously supplied to the firing furnace main body (13) together with the non-oxidizing gas introduced from the non-oxidizing gas inlet (A).

In addition, an aromatic hydrocarbon introducing device is installed at the front part of the calcining furnace (Fig. 1-a) in the front type, and at the rear part of the calcining furnace (Fig. 2-b) in the post-install type.

The conductive fibers that have been made conductive in the firing furnace pass through the intake port (21) and are accumulated in the stocker (23), and the gas in the furnace passes through the gas discharge pipe (24) and is discharged into the discharge port (B). ).

Note that other devices are shown for reference and are not limited to the configuration shown in the figure, but the firing furnace has a rotating shaft (11), a sliding part (10 )
The rotational motion is transmitted through the shaft and rotates.

On the other hand, the gas introduction pipe (7) and the gas discharge pipe (24) are protected by protection pipes (8) and (25), respectively, and the rotating shaft (1)
1) and the opening of the protection tube to maintain airtightness by installing sealing material (9) as needed.
) to prevent the introduction of outside air.

The protection tube, gas introduction tube (7), and gas discharge tube (24) are connected to each other by an airtight sliding connection device (28), and the transmission of the rotational motion of the firing furnace main body to external equipment is blocked. ing.

(Example) Hereinafter, embodiments of the invention will be described with reference to Examples.

Example 1 Potassium titanate fiber (manufactured by Jinu Kagaku Co., Ltd.) is prepared by wet defibrating a potassium titanate raw material and then spray-drying it in heated nitrogen.

TEISMO D) is stored in the preliminary room, and Figures 1-a and 1-b
In the co-current contact type firing furnace (13) shown in the figure, after replacing the entire equipment system with nitrogen gas, the temperature at the front of the furnace is 450°C, the temperature at the center of the furnace is 850°C, and the temperature at the rear of the furnace is 950"Cl:
After the adjustment, potassium titanate was transferred from the preparatory chamber with a nitrogen gas stream and was constantly supplied from the inlet (14) at a supply rate of 5 kg/hr. The firing furnace is adjusted to a rotational speed of 1 rpI11, and the supplied potassium titanate passes through each firing temperature range for 10 minutes, and is constantly passed through the outlet (2).
) and stored in the stocker (23).

At the same time as potassium titanate is introduced into the atmosphere adjusted to the above conditions, benzene is introduced from the vaporizer (2) through the coupler (6).
By introducing the gas from the gas introduction pipe (7) under the supply conditions of 5ffi/hr (benzene dinitrogen ratio = 1:5), the amount of carbon deposited was 10.3 at a collection rate of 5.5 kHz/hr into the stocker (23). %, volume resistivity 8.7X 10-'Ω
- Highly conductive potassium titanate fibers of Cll1 were obtained, no free carbon was observed by electron microscopy, and no change in shape was observed between the potassium titanate fibers and Teismo D used as the raw material.

Example 2 The same method as in Example 1 was carried out except that the temperature at the rear of the kiln was set at 850°C, and the recovery amount was reduced to 5.3 kHz/hr.
Carbon content 8.6%, volume specific resistivity 3.7X 10-3Ω
- Highly conductive potassium titanate fiber of cIll was obtained.

Example 3 When the same method as in Example 1 was carried out except that the benzene dinitrogen ratio was changed to 1:2, the recovery amount increased to 5.8 kHz/hr, the carbon content was 17.1%, and the specific volume resistivity was 1. 3×10−
A highly conductive potassium titanate fiber of Ω·Cm was obtained, but some free carbon was observed.

Reference Example 1 In Example 1, the temperature of the entire area of the firing furnace was set to 850°C, and after supplying potassium titanate, the supply was temporarily interrupted, and at the same time, the rotation of the furnace was stopped, and benzene was introduced for 30 minutes under the same conditions as Example 1. After that, after switching the introduced gas to only nitrogen gas, the furnace started rotating again and the potassium titanate in the furnace was recovered, and the carbon content was 13.5%, and the specific volume resistivity was 8.3X 10-
A highly conductive potassium titanate fiber of 'Ω・ell was obtained, but NMR and Mass analysis of the extracted components extracted with benzene from the obtained potassium titanate fiber revealed biphenyl, terphenyl, and triphenylbenzene. Benzene condensates such as

Comparative Example 1 After supplying potassium titanate in the same manner as in Reference Example 1, the on-off valve (17
), (22) were closed, methane gas was introduced from the gas inlet pipe (7) at 2000 mm/A q<water column) for 1 hour, and the furnace temperature was 900'C in all areas.The carbon content was 11.8%. , volume resistivity 2.4X10-2Ω・c
m and conductivity were insufficient.

Comparative Example 2 In Comparative Example 1, the ratio of methane gas to dinitrogen was 1
When the same method was used except for changing the firing temperature to 800°C, the carbon content was 4.3% and the specific volume resistivity was 4.
It was 7×102Ω・can.

Example 4 Potassium titanate fiber (Teismo D) was dispersed in a 1% liquid paraffin emulsion, adjusted so that the liquid paraffin was 0.1% with respect to potassium titanate WL miscellaneous, and then spray-dried in a nitrogen atmosphere. , stored in the preliminary chamber in the same manner as in Example 1, and carried out in the same manner as in Example 1, with a carbon adhesion amount of 9.8% and a volume specific resistivity of 7. A highly conductive potassium titanate fiber of 1×10 −4 Ω·cIll was obtained.

Example 5 The same method as in Example 4 was carried out except that 1% tungsten oxide was homogeneously dispersed in a 1% liquid paraffin emulsion, and the carbon adhesion amount was 10.
．． Highly conductive potassium titanate fibers with a specific volume resistivity of 1% and a volume resistivity of 4.9×10 −′Ω·cm were obtained.

Example 6 In the countercurrent contact method shown in Figures 2-a and 2-b, after replacing the entire equipment system with nitrogen gas, the front part of the firing furnace was heated to 850°C.
1 After adjusting the center part to 950 °C and 1 rear part to 500 °C, potassium titanate fiber was introduced from the preliminary chamber in the same manner as in Example 1.
Benzene vapor was introduced from a vaporizer. However, the amount of potassium titanate v & miscellaneous input is 5 kg/hr.

The supply conditions were as follows: benzene supply amount 3f/i+r, benzene dinitrogen ratio = 0, and the passage time through the temperature range of each firing section was 10 minutes. By firing under the above conditions, highly conductive potassium titanate fibers were collected in the stocker at a collection rate of 5.4 kg/hr, with a carbon adhesion amount of 11.2% and a volume specific resistivity of 7.3 x 10-'Ω・cm. No free carbon or shape abnormalities were observed in electron micrographs.

Example 7 Using the spray-dried potassium titanate fiber shown in Example 4, the same method as in Example 6 was used to obtain a carbon adhesion amount of 10.
Highly conductive titanium acid with 8% volume resistivity and 6.4 x 10-'Ωcm 1. Iffl fibers were obtained.

Example 8 The following Example 6 was carried out using potassium titanate fibers treated in the same manner as in Example 5 by changing tungsten oxide to nickel nitrate.
The carbon adhesion amount was 10.4%, and the specific volume resistivity was 4. Highly conductive potassium titanate a-fibers of 1×10-'Ω·cm were obtained.

(Effect of the invention) The highly conductive fiber according to the invention has various physical properties that #JJL# and the quality components have, especially heat resistance, reinforcing properties when used as a composite material, and surface smoothness. Keep it as is. In addition, since it exhibits superior conductivity compared to conductive fibers obtained by conventionally known methods, its suitability for use as antistatic, static electricity removal, conductive materials, etc. has been significantly improved, and especially It has high industrial applicability as a conductive treatment agent for conductive materials such as sheets, paper, fabrics, and films.

Furthermore, the conductive fibers of the present invention are widely used in various other applications such as reinforcing materials for plastics, conductive paints, and conductive inks.

[Brief explanation of drawings]

Figure 1-a shows the front part of the pre-fired furnace and its attached equipment.
Figure 1-b is a schematic diagram showing the rear part of the pre-fired furnace and its attached equipment. Further, Fig. 2-a is a schematic diagram showing the front part of the post-installation type firing furnace and its attached equipment, and Fig. 2-b is a schematic diagram showing the rear part of the post-installation type kiln and its attached equipment. (Above) Patent applicant Otsuka Chemical Co., Ltd. Agent Patent attorney 1) Iwao Mura Figure 2-b

Claims (11)

[Claims] (1) A highly conductive fiber in which the surface of the fibrous component is coated with a coating mainly composed of carbonaceous material, and the specific volume resistivity is less than 10^-^2 Ω·cm. (2) Constantly supply the fibrous component to the heating and firing furnace, and add 10 to 10 parts of the aromatic hydrocarbon component to 100 parts by weight of the fibrous component.
1. A method for producing highly conductive fibers, which comprises introducing the fibers from a vaporization chamber to a concentration of 0 parts by weight, and then firing the fibers at 800 to 1100° C. in a non-oxidizing atmosphere. (3) The method for producing highly conductive fibers according to claim 2, wherein the vaporization chamber is of a pre-installed type. (4) The method for producing highly conductive fibers according to claim 2, wherein the vaporization chamber is of a post-installation type. (5) The highly conductive fiber according to claim 1, wherein the fibrous component is an alkali titanate. (6) The method for producing highly conductive fibers according to claim 2, wherein the fibrous component is an alkali titanate. (7) The highly conductive fiber according to claim 1, in which one or more compounds such as manganese, molybdenum, tungsten, boron, iron, nickel, and cobalt are used in combination as a catalyst. (8) The method for producing highly conductive fibers according to claim 2, in which one or more compounds such as manganese, molybdenum, tungsten, boron, iron, nickel, and cobalt are used in combination as a catalyst. (9) The highly conductive fiber according to claim 1, wherein the aromatic hydrocarbon component is benzene. (10) The method for producing highly conductive fibers according to claim 2, wherein the aromatic hydrocarbon component is benzene. (11) The method for producing highly conductive fibers according to claim 2, wherein the firing temperature is 900°C or higher.