JPH0733512B2 - Method for producing binder for carbon material - Google Patents
Method for producing binder for carbon materialInfo
- Publication number
- JPH0733512B2 JPH0733512B2 JP26810087A JP26810087A JPH0733512B2 JP H0733512 B2 JPH0733512 B2 JP H0733512B2 JP 26810087 A JP26810087 A JP 26810087A JP 26810087 A JP26810087 A JP 26810087A JP H0733512 B2 JPH0733512 B2 JP H0733512B2
- Authority
- JP
- Japan
- Prior art keywords
- pitch
- carbon
- carbon material
- binder
- weight
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/52—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/52—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite
- C04B35/528—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite obtained from carbonaceous particles with or without other non-organic components
- C04B35/532—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite obtained from carbonaceous particles with or without other non-organic components containing a carbonisable binder
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Working-Up Tar And Pitch (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は炭素材料用結合剤の製造法に関し、さらに詳し
くは、溶融ピッチに炭素繊維チョップを特定量添加分散
させ、これを冷却、粉砕（粗砕）させることにより、得
られる炭素材料の曲げ強度を大幅に向上させた炭素材料
用結合剤の製造法に関する。TECHNICAL FIELD The present invention relates to a method for producing a binder for carbon materials, and more specifically, a specific amount of carbon fiber chops are added and dispersed in a molten pitch, which is cooled and ground ( The present invention relates to a method for producing a binder for a carbon material in which the bending strength of the obtained carbon material is significantly improved by crushing.
［従来技術とその問題点］ 炭素材料は、摺動材やルツボ、放電加工用電極等の用途
に用いられているが、この炭素材料の製造法としては、
コークス等の原料を粉砕、篩別、配合等を行なって粒状
または粉状の混捏用原料粉を得、これをタールピッチ等
の結合剤（バインダーピッチ）とよく混捏し、例えば再
粉砕、成形、焼成、黒鉛化等の工程を経て製造される。[Prior Art and its Problems] Carbon materials are used for sliding materials, crucibles, electrodes for electric discharge machining, and the like.
Raw materials such as coke are pulverized, sieved, blended, etc. to obtain a granular or powdery raw material powder for kneading, which is well kneaded with a binder (binder pitch) such as tar pitch, for example, re-milling, molding, It is manufactured through steps such as firing and graphitization.
そして、炭素材料の特性を向上させるべく、粒状または
粉状のコークス等の混捏用原料粉とバインダーピッチを
混捏する際に、炭素繊維を併せて混捏することが行なわ
れている。In order to improve the characteristics of the carbon material, when kneading the kneading raw material powder such as granular or powdery coke and the binder pitch, the carbon fibers are also kneaded together.
しかしながら、これらの各成分を混合機に単独で投入し
て混捏すると、炭素繊維は嵩高いので、混捏物中でモノ
フィラメントにほぐれず、毛玉となって混捏物中に存在
して、炭素材料の強度向上には寄与しないという問題が
ある。However, when each of these components is individually put into a mixer and kneaded, the carbon fiber is bulky, so that it cannot be loosened into a monofilament in the kneaded product and is present in the kneaded product in the form of pills. There is a problem that it does not contribute to the improvement of strength.
従来、このような問題を解決し、炭素繊維の分散性を良
くする方法として、次に示す方法が提案されている。Conventionally, the following method has been proposed as a method for solving such problems and improving the dispersibility of carbon fibers.
バインダーを過剰に用いて混捏する。 Knead with excess binder.
加圧混捏等での混捏条件を厳しくする。 Strict kneading conditions such as pressure kneading.
［発明が解決しようとする問題点］ しかしながら、上記の方法では、炭素材料の嵩比重が
低下して曲げ強度が低下する。また、の方法では、炭
素繊維を切断することになってしまい、強度向上には寄
与しない等の欠点がある。[Problems to be Solved by the Invention] However, in the above method, the bulk specific gravity of the carbon material is lowered, and the bending strength is lowered. In addition, the method (1) has a drawback that the carbon fiber is cut and does not contribute to the improvement of strength.
本発明は、上記した問題点を解決し、炭素材料の曲げ強
度の向上に寄与する炭素材料用結合剤の製造法を提供す
ることを目的とする。An object of the present invention is to solve the above-mentioned problems and to provide a method for producing a binder for a carbon material, which contributes to the improvement of the bending strength of the carbon material.
［問題点を解決するための手段］ 本発明者等は、上記問題点を解決すべく、種々検討した
結果、炭素材料用結合剤として従来より用いられる溶融
ピッチに、炭素繊維チョップを特定量添加分散させ、こ
れを冷却、粉砕することによって、上記目的が達成され
ることを知見し、本発明を完成するに至った。[Means for Solving the Problems] The inventors of the present invention have conducted various studies to solve the above problems, and as a result, have added a specific amount of carbon fiber chops to the molten pitch conventionally used as a binder for carbon materials. It was found that the above object can be achieved by dispersing, cooling, and pulverizing this, and completed the present invention.
すなわち本発明は、溶融ピッチに対し、炭素繊維チョッ
プ１〜８重量％を添加分散させた後、冷却、粉砕するこ
とを特徴とする炭素材料用結合剤の製造方法である。That is, the present invention is a method for producing a binder for a carbon material, which comprises adding and dispersing 1 to 8% by weight of carbon fiber chops to a molten pitch, and then cooling and pulverizing.
本発明では、固形ピッチを加熱、溶融した溶融ピッチを
用いる。ここでいうピッチとは、石油ピッチや石炭ピッ
チを出発物質としたコールタールピッチやアスファルト
ピッチ等が挙げられる。ピッチの溶融温度としては、ピ
ッチの軟化点以上であって例えば150〜200℃の範囲が好
適に採用される。In the present invention, the molten pitch obtained by heating and melting the solid pitch is used. Examples of the pitch mentioned here include coal tar pitch, asphalt pitch, and the like, which use petroleum pitch or coal pitch as a starting material. The melting temperature of the pitch is preferably equal to or higher than the softening point of the pitch and is, for example, in the range of 150 to 200 ° C.
本発明においては、この溶融ピッチに炭素繊維チョップ
を添加する。ここで用いられる炭素繊維としては、特に
限定されるものではなく、例えばポリアクリロニトリル
（PAN）、石油または石炭ピッチ、レーヨン系等から得
られた炭素繊維が任意に使用できる。また、炭素繊維チ
ョップとは、炭素繊維をチョップしたもので、具体的に
は炭素繊維のストランド、トウ、ウィスカー、ヤーン等
が挙げられる。In the present invention, carbon fiber chops are added to this molten pitch. The carbon fiber used here is not particularly limited, and for example, carbon fiber obtained from polyacrylonitrile (PAN), petroleum or coal pitch, rayon-based or the like can be arbitrarily used. The carbon fiber chop is a chopped carbon fiber, and specifically includes carbon fiber strands, tows, whiskers, yarns and the like.
この炭素繊維チョップの繊維長としては0.2〜15mmの範
囲にあるものが好ましく、平均繊維長としては２〜6mm
のものが好ましい。The carbon fiber chop preferably has a fiber length in the range of 0.2 to 15 mm, and an average fiber length of 2 to 6 mm.
Are preferred.
また、溶融ピッチに対する炭素繊維チョップの添加量と
しては、溶融ピッチに対して１〜８重量％、さらには２
〜６重量％の範囲が好ましい。炭素繊維チョップの添加
量が１重量％未満では、炭素材料の曲げ強度の向上に寄
与せず、また、８重量％を超えて添加しても、それ以上
の添加効果がない。The amount of carbon fiber chop added to the molten pitch is 1 to 8% by weight, more preferably 2% to the molten pitch.
The range of up to 6% by weight is preferred. If the amount of carbon fiber chop added is less than 1% by weight, it will not contribute to the improvement of the bending strength of the carbon material, and if it is added in excess of 8% by weight, there will be no further effect.
このように所定量の炭素繊維チョップを添加、分散した
溶融ピッチを冷却固化し、炭素繊維添加固形ピッチを
得、次いで、この炭素繊維添加固形ピッチを粗砕（粉
砕）して、20mm〜100μｍの粒径範囲の炭素材料用結合
剤を得る。In this way, a predetermined amount of carbon fiber chop is added, the dispersed molten pitch is cooled and solidified to obtain a carbon fiber-added solid pitch, and then this carbon fiber-added solid pitch is crushed (crushed) to a size of 20 mm to 100 μm. A binder for a carbon material having a particle size range is obtained.
本発明により得られたこの炭素材料用結合剤は、粒状ま
たは粉状のコークス等の混捏用原料粉と混捏し、混捏物
とされ、この混捏物は必要があれば再粉砕、成形、焼
成、黒鉛化等の工程を経て、高強度の炭素材料とされ
る。この高強度の炭素材料は、摺動材等の種々の用途に
供される。The binder for carbon material obtained by the present invention is kneaded with a kneading raw material powder such as granular or powdery coke to be a kneaded product, and the kneaded product is re-ground, shaped, baked, if necessary, It is made into a high-strength carbon material through steps such as graphitization. This high-strength carbon material is used for various applications such as sliding materials.
この炭素材料用結合剤を混捏用原料粉と混捏すると、結
合剤中の炭素繊維はピッチ固形物から少量ずつ削り取ら
れて混合されるので、混捏物中に均一に分散する。When the binder for carbon material is kneaded with the raw material powder for kneading, the carbon fibers in the binder are scraped off little by little from the pitch solid matter and mixed, so that the carbon fibers are uniformly dispersed in the kneaded material.
従って、炭素繊維は炭素材料中に均一に分散しているの
で、曲げ強度が著しく向上する。Therefore, since the carbon fibers are uniformly dispersed in the carbon material, the bending strength is remarkably improved.
［実施例］ 以下、本発明を実施例および比較例に基づいてさらに具
体的に説明する。[Examples] Hereinafter, the present invention will be described more specifically based on Examples and Comparative Examples.
実施例１ 軟化点105℃のピッチを170℃で加熱溶融して、溶融ピッ
チとし、この溶融ピッチに対して、繊維長3mm、繊維径
７μｍの炭素繊維チョップ４重量％添加して溶融ピッチ
中に分散させた。次いでこれを冷却して炭素繊維添加固
形ピッチを得、さらに、これを粗砕して20mm〜100μｍ
の粒径範囲の炭素材料用結合剤を得た。Example 1 A pitch having a softening point of 105 ° C. was heated and melted at 170 ° C. to obtain a molten pitch, and 4% by weight of a carbon fiber chop having a fiber length of 3 mm and a fiber diameter of 7 μm was added to the molten pitch to obtain a molten pitch. Dispersed. Then, this is cooled to obtain carbon fiber-added solid pitch, which is further crushed to 20 mm to 100 μm.
A binder for carbon materials having a particle size range of
この結合剤33重量部と2mm〜100μｍの粒径範囲のコーク
ス100重量部とを混捏後、50Kg/cm2の圧力で押し出し成
形し、窒素雰囲気中で900℃、48時間焼成し、黒鉛化し
て炭素材料を得た。この炭素材料の曲げ強度と押し出し
成形物中の繊維長を測定し、結果を第１表に示した。After 33 parts by weight of this binder and 100 parts by weight of coke having a particle size range of 2 mm to 100 μm were kneaded, they were extruded at a pressure of 50 Kg / cm 2 and fired in a nitrogen atmosphere at 900 ° C. for 48 hours to graphitize. A carbon material was obtained. The bending strength of this carbon material and the fiber length in the extruded product were measured, and the results are shown in Table 1.
比較例１ 2mm〜10μｍの粒径範囲のコークス100重量部とピッチ32
重量部および繊維長3mm、繊維径７μｍの炭素繊維チョ
ップ１重量部を混捏した混捏物を実施例１と全く同様
に、再粉砕、押し出し成形、焼成、黒鉛化して炭素材料
を得た。この炭素材料の曲げ強度と押し出し成形物中の
繊維長を測定し、結果を第１表に示した。Comparative Example 1 100 parts by weight of coke and a pitch of 32 in the particle size range of 2 mm to 10 μm
A kneaded material obtained by kneading 1 part by weight of a carbon fiber chop having a weight part and a fiber length of 3 mm and a fiber diameter of 7 μm was re-ground, extruded, fired and graphitized in the same manner as in Example 1 to obtain a carbon material. The bending strength of this carbon material and the fiber length in the extruded product were measured, and the results are shown in Table 1.
比較例２ ピッチ100重量部に対して熱膨張係数1.0×10-6/℃のオ
イルコークス粉末（５〜50μｍ）20重量部を添加し、16
0〜180℃で３時間加熱攪拌して得られた結合剤30重量部
を、石油コークス100重量部（9.5〜4mmの範囲50重量
部、150メッシュ以下50重量部）と添加混合して、混捏
後、押し出し成形し焼成、黒鉛化した。 Comparative Example 2 20 parts by weight of oil coke powder (5 to 50 μm) having a thermal expansion coefficient of 1.0 × 10 −6 / ° C. was added to 100 parts by weight of the pitch, and
30 parts by weight of the binder obtained by heating and stirring at 0 to 180 ° C. for 3 hours was added and mixed with 100 parts by weight of petroleum coke (50 parts by weight in the range of 9.5 to 4 mm, 50 parts by weight of 150 mesh or less) and kneaded. After that, extrusion molding, firing, and graphitization were performed.
その結果、得られた炭素材料の曲げ強度は115Kg/cm2で
あった。As a result, the bending strength of the obtained carbon material was 115 Kg / cm 2 .
これらの結果から明らかなように、本発明により得られ
た結合剤をコークス粉と一緒に混捏し、成形、焼成し、
黒鉛化して得られた実施例１の炭素材料は、従来から製
造されている方法で得られた比較例１または比較例２の
炭素材料と比較して、曲げ強度において約30％程度また
はそれ以上向上することがわかる。As is clear from these results, the binder obtained by the present invention was kneaded together with coke powder, molded and fired,
The carbon material of Example 1 obtained by graphitization has a bending strength of about 30% or more as compared with the carbon material of Comparative Example 1 or Comparative Example 2 obtained by a conventionally manufactured method. You can see that it will improve.
［発明の効果］ 以上説明したように、溶融ピッチに炭素繊維チョップを
特定量添加分散させ、これを冷却、粉砕させる本発明の
製造法により得られた結合剤を用いることによって、炭
素材料の曲げ強度を大幅に向上させることができる。[Effects of the Invention] As described above, a specific amount of a carbon fiber chop is added and dispersed in a molten pitch, and the binder obtained by the production method of the present invention in which this is cooled and ground is used to bend the carbon material. The strength can be greatly improved.
Claims (2)
８重量％を添加分散させた後、冷却、粉砕することを特
徴とする炭素材料用結合剤の製造法。1. A carbon fiber chop 1 to 1 for a molten pitch.
A method for producing a binder for a carbon material, which comprises adding and dispersing 8% by weight, cooling and pulverizing.
mの範囲にある特許請求の範囲第１項に記載の炭素材料
用結合剤の製造法。2. The carbon fiber chop has a fiber length of 0.2 to 15 m.
The method for producing a binder for a carbon material according to claim 1, which is in the range of m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26810087A JPH0733512B2 (en) | 1987-10-26 | 1987-10-26 | Method for producing binder for carbon material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26810087A JPH0733512B2 (en) | 1987-10-26 | 1987-10-26 | Method for producing binder for carbon material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01110593A JPH01110593A (en) | 1989-04-27 |
| JPH0733512B2 true JPH0733512B2 (en) | 1995-04-12 |
Family
ID=17453894
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26810087A Expired - Lifetime JPH0733512B2 (en) | 1987-10-26 | 1987-10-26 | Method for producing binder for carbon material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0733512B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1593661A1 (en) * | 2004-04-26 | 2005-11-09 | UCAR Carbon Company Inc. | Carbon fiber binder pitch |
| KR102474281B1 (en) * | 2020-11-02 | 2022-12-06 | 한국화학연구원 | Method of preparing heavy oil-derived anisotropic pitch suitable for carbon fiber based on mesogen separation |
-
1987
- 1987-10-26 JP JP26810087A patent/JPH0733512B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01110593A (en) | 1989-04-27 |
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