JPH04300353A - Production of spherical carbon fiber - Google Patents
Production of spherical carbon fiberInfo
- Publication number
- JPH04300353A JPH04300353A JP3080607A JP8060791A JPH04300353A JP H04300353 A JPH04300353 A JP H04300353A JP 3080607 A JP3080607 A JP 3080607A JP 8060791 A JP8060791 A JP 8060791A JP H04300353 A JPH04300353 A JP H04300353A
- Authority
- JP
- Japan
- Prior art keywords
- carbon fiber
- fibers
- carbon
- spheres
- sphere
- 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.)
- Pending
Links
- 229920000049 Carbon (fiber) Polymers 0.000 title claims description 56
- 239000004917 carbon fiber Substances 0.000 title claims description 54
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims description 49
- 238000004519 manufacturing process Methods 0.000 title claims description 10
- 239000000835 fiber Substances 0.000 claims abstract description 23
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 9
- 238000005096 rolling process Methods 0.000 claims abstract description 7
- 238000004513 sizing Methods 0.000 claims description 8
- 230000003213 activating effect Effects 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 29
- 229910052799 carbon Inorganic materials 0.000 abstract description 22
- 239000000463 material Substances 0.000 description 19
- 239000002131 composite material Substances 0.000 description 18
- 238000000034 method Methods 0.000 description 12
- 230000004913 activation Effects 0.000 description 10
- 238000001179 sorption measurement Methods 0.000 description 10
- 239000003575 carbonaceous material Substances 0.000 description 7
- 239000000945 filler Substances 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 239000007789 gas Substances 0.000 description 6
- 239000012774 insulation material Substances 0.000 description 6
- 239000011347 resin Substances 0.000 description 6
- 229920005989 resin Polymers 0.000 description 6
- 239000002904 solvent Substances 0.000 description 6
- 238000011282 treatment Methods 0.000 description 6
- 239000011230 binding agent Substances 0.000 description 5
- 239000000057 synthetic resin Substances 0.000 description 5
- 229920003002 synthetic resin Polymers 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 238000003763 carbonization Methods 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- 239000004372 Polyvinyl alcohol Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005087 graphitization Methods 0.000 description 3
- 229920002451 polyvinyl alcohol Polymers 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 239000001768 carboxy methyl cellulose Substances 0.000 description 2
- 235000010948 carboxy methyl cellulose Nutrition 0.000 description 2
- 239000008112 carboxymethyl-cellulose Substances 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 229920001187 thermosetting polymer Polymers 0.000 description 2
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 description 2
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 238000004438 BET method Methods 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 150000001721 carbon Chemical class 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000001877 deodorizing effect Effects 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000007849 furan resin Substances 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 238000009940 knitting Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000000123 paper Substances 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229920003169 water-soluble polymer Polymers 0.000 description 1
- 239000002759 woven fabric Substances 0.000 description 1
- 235000005074 zinc chloride Nutrition 0.000 description 1
- 239000011592 zinc chloride Substances 0.000 description 1
Abstract
Description
【発明の詳細な説明】
【０００１】
【産業上の利用分野】本発明は、炭素繊維強化炭素材料
あるいは炭素系高温断熱材料として有用な炭素繊維複合
成形体の基材あるいは充填材として好適な炭素繊維球状
体、及びそれを用いた活性炭素繊維球状体の製造方法に
関する。
【０００２】
【従来の技術】炭素繊維は、高い強度、耐熱性、耐蝕性
など優れた特性を有しており、炭素繊維強化炭素材料、
炭素系高温断熱材料等の複合材料の基材あるいは充填材
として有用な材料である。また、炭素繊維を賦活して得
られる活性炭素繊維は、通常の粉末あるいは粒状の活性
炭に比較して繊維径が非常に細く、接触効率が高いので
、吸着速度が早く単位重量当りの吸着量も多いため、各
種フィルタ−や吸着層の充填材として注目されている。
従来炭素繊維複合材料を製造するに当っては、炭素繊維
を２次元あるいは３次元に製織し、フェルト状あるいは
マット状とし、これに樹脂等のバインダ−を加えて成形
した形で炭素繊維強化炭素材料の中間基材（プリプレグ
）あるいは炭素系高温断熱材料としている。 しかし
ながら、これらの複合材料の製造方法においては織機等
の機械を使用する必要があり、得られた複合成形体は製
織した炭素繊維を用いているため炭素繊維が縦横方向に
配向しており、その配列方向に対して電気的性質、機械
的強度等に異方性が生じ易い。また、このように製織し
たものは、嵩密度が高く、断熱材等に使用した場合の重
量が大きくなる傾向がある。また、活性炭素繊維は、通
常、フェルト、不織布、織物、紙のような形で用いられ
ているが、吸着塔などに充填して使用するには、取扱い
にくく、また、大量に充填した場合には圧力損失が増大
するという難点があった。
【０００３】
【発明が解決しようとする課題】本発明の目的は、従来
長繊維を２次元、３次元に編成したフェルト及びマット
の使用では得られなかった低密度で、弾力性に富み、さ
らに熱的、電気的、力学的性質に等方性を示す炭素繊維
強化炭素材料あるいは炭素系高温断熱材料として有用な
炭素繊維複合成形体の基材あるいは充填材として好適な
炭素繊維球状体、及び軽量で取扱いが容易で圧力損失の
増大が少なく各種フィルタ−や吸着処理装置の充填材と
して好適な活性炭素繊維球状体の製造方法を提供するこ
とにある。
【０００４】
【課題を解決するための手段】本発明者らは、炭素繊維
を使用した複合材料の検討過程において、短く切断した
炭素繊維がその取扱い中に絡まって毛玉を形成し易い性
質を有することに着目して検討を進めた結果、適当な長
さに調整した炭素繊維チョップドファイバ−に少量のバ
インダ−成分を加えて特定の条件下で処理することによ
り、各種複合材の基材や充填材、活性炭素繊維の前駆体
として有用な炭素繊維球状体が得られることを見出し、
本発明を完成した。すなわち、本発明は、炭素繊維チョ
ップドファイバ−と収束剤とを、転動及び流動作用を示
す装置により混合して造粒することを特徴とする繊維が
相互に絡み合って形成され、密度が ０．０５ 〜０．
１５ ｇ／ｃｍ３ で等方的性質を有する炭素繊維球状
体の製造方法、並びに炭素繊維チョップドファイバ−と
収束剤とを、転動及び流動作用を示す装置により混合し
て造粒して得られる繊維が相互に絡み合って形成され、
密度が ０．０５ 〜０．１５ ｇ／ｃｍ３ で等方的
性質を有する炭素繊維球状体を賦活処理することを特徴
とする活性炭素繊維球状体の製造方法である。
【０００５】本発明の炭素繊維球状体は、次のような方
法によって製造される。すなわち、０．５ 〜３０ｍｍ
の長さに調整した炭素繊維チョップドファイバ−を収束
剤とともに、オムニミキサ−やパンペレタイザ−のよう
な転動及び流動効果を示す混合あるいは造粒装置を用い
て混合し、造粒する。ここで使用する炭素繊維としては
ＰＡＮ系、ピッチ系その他いずれのものでもよく、また
、高強度品、汎用品など特に制限はない。収束剤は、得
られる炭素繊維球状体の用途に応じて使い分けが可能で
あり、好ましくは水、ＰＶＡ（ポリビニルアルコ−ル）
、ＣＭＣ（カルボキシメチルセルロ−ス）、水溶性アク
リル樹脂などの水溶性高分子化合物の水溶液、フェノ−
ル樹脂、エポキシ樹脂、フラン樹脂等の合成樹脂の有機
溶媒溶液が使用できる。収束剤の使用量は、繊維表面に
軽く付着する程度で充分であり、水の場合では、繊維重
量に対し １０ 〜５０ｗｔ％が好ましい。炭素繊維チ
ョップドファイバ−の長さが ０．５ｍｍ未満では繊維
どうしの絡み合いが少ないので良好な球体を形成するこ
とができず、また、３０ｍｍを超えると転動及び流動の
効果が充分発揮されないので好ましくない。この混合、
造粒操作により、個々の炭素繊維チョップドファイバ−
が互いに絡み合い、雪だるま式に繊維が付着し絡み合う
ようになり、毛玉状の球状体が得られるのである。この
方法により得られる炭素繊維球状体は、密度が ０．０
５ 〜０．１５ ｇ／ｃｍ３ と非常に軽く、球径は約
２〜２５ｍｍ、大部分は約 ４〜２０ｍｍで、球形又
はそれに近い形状を有しており、電気的、熱的、強度的
に等方的性質を示し、炭素繊維強化炭素材料の中間基材
（プリプレグ）あるいは炭素系高温断熱材料の素材とし
て好適である。
【０００６】また、このようにして得られる炭素繊維球
状体を賦活処理することにより良好な特性を有する活性
炭素繊維球状体を得ることができる。賦活方法としては
、通常の活性炭の賦活と同様に、水蒸気や炭酸ガスによ
るガス賦活あるいは塩化亜鉛などの薬品を用いる賦活を
採ることができるが、本発明の活性炭素繊維球状体の製
造方法としては、バッチ式あるいは連続式のロ−タリ−
キルンを使用し、 ７５０℃以上の温度で水蒸気あるい
は炭酸ガスを用いて賦活するのが好ましい。ここで使用
する炭素繊維球状体は、球状で取扱い易くロ−タリ−キ
ルン内での分散がよく、しかも球体内の通気性も良好な
ので、賦活反応は円滑に進行し、均一に賦活された活性
炭素繊維の球状体を得ることができる。
【０００７】本発明の方法によって得られる活性炭素繊
維球状体は、比表面積が ５００〜２５００ｍ２／ｇ
と大きく、気体液体成分の吸脱着速度が速いので各種の
脱臭、ガス分離、溶剤回収装置等の充填材としての用途
のほか、電気二重層コンデンサ−の電極などの電池材料
としても好適である。
【０００８】本発明の方法によって得られる炭素繊維球
状体は、炭素繊維チョップドファイバ−あるいは短繊維
及び、ＰＶＡ、パルプ、フェノ−ル樹脂やエポキシ樹脂
などの熱硬化性樹脂、ポリ塩化ビニル等の熱可塑性樹脂
などのバインダ−成分を混合し、好ましくは水などの溶
媒中で湿式混合した後、濾過して溶媒を除去し、さらに
プレス等により任意の形状に成形し乾燥させることによ
り、バインダ−成分を介して炭素繊維が結合し、多孔質
、軽量で等方的な性質を有する炭素繊維複合成形体を得
ることができる。得られた炭素繊維複合成形体は、必要
によりさらに炭化処理を施すことにより、炭素のみから
なる成形体とすることができる。このようにして得られ
た炭素繊維複合成形体は、嵩密度が ０．０５ 〜０．
２ｇ／ｃｍ３ と軽量で弾力性に富み、電気的、熱的、
強度的に等方的性質を有する成形体であり、炭素系高温
断熱材料、炭素系高温断熱材として極めて良好な材料で
ある。さらに、チョップドファイバ−及びバインダ−成
分を添加混合し、成形し、必要によりさらに炭化して得
られる成形体に合成樹脂成分を含浸させ、硬化させ、必
要によりさらに炭化、黒鉛化処理を施す方法がある。こ
の方法においては、炭素繊維球状体に対し、炭素繊維チ
ョップドファイバ−あるいは短繊維及びバインダ−成分
を混合し、好ましくは水などの溶媒中で湿式混合した後
、濾過して溶媒を除去し、さらにプレス等により任意の
形状に成形し乾燥させる。この成形体あるいはさらにこ
れを炭化した成形体に、必要により溶媒で希釈した合成
樹脂成分を含浸させ、乾燥、硬化させることにより、炭
素繊維と合成樹脂の複合成形体を得ることができる。引
続いて炭化、さらに黒鉛化処理を施すことにより炭素繊
維強化炭素材の形の複合成形体とすることもできる。ま
た、樹脂の含浸、炭化、黒鉛化等の処理を繰返すことに
より複合成形体の密度等を任意に制御することも可能で
ある。この方法によって得られる炭素繊維複合成形体は
、電気的、熱的、強度的に等方的性質を有する炭素繊維
強化合成樹脂及び炭素繊維強化炭素材料であり、各種構
造材、摺動材などの材料として好適である。
【０００９】
【実施例】以下実施例により本発明をさらに具体的に説
明する。
（実施例１）繊維径 １０ μｍ 、繊維長 ３ｍｍの
ピッチ系炭素繊維チョップドファイバ− ２００ｇをオ
ムニミキサ−中に投入して作動させ、２分間で収束剤と
しての水 ５０ｇを噴霧し、さらに５分間作動させた後
、ミキサ−から取出し、篩により粉体を除去し、１１０
℃で １２ 時間乾燥させて炭素繊維球状体を得た。
得られた球状体の歩留りは、約 ９０ ％であり、その
８０ ％以上が球径 ４〜６ ｍｍの範囲内にあるほ
ぼ均一径の球状体であった。また、それぞれの球体の密
度は約 ０．１ ｇ／ｃｍ３ であり、軽量で弾力性の
ある等方的性質を有していた。
【００１０】（実施例２）実施例１で得た炭素繊維球状
体 １００ｇ をロ−タリ−キルン中で不活性雰囲気下
に ９００℃まで加熱し、水蒸気８０ ％及び窒素 ２
０ ％の賦活ガスを導入し、同温度で所定時間賦活処理
を行い活性炭素繊維球状体を得た。得られた炭素繊維球
状体の比表面積及びＪＩＳＫ−１４７４の方法により吸
着能力の測定を行った結果は次の通りであり、大きな比
表面積と良好な吸着能力を有することがわかる。
賦活時間 比
表面積 ベンゼン平衡吸着量
（ 分 ） （ Ｎ２
ＢＥＴ 法 ） （ ｗｔ％ ）
２５
７７３ ２８．６
４０ １１
５８ ３９．２
５０ １５７５
４４．９ 【００１１】
【発明の効果】本発明の方法によれば、従来得られなか
った軽量で取扱いが容易で、高い通気性を有する炭素繊
維複合成形体の基材あるいは充填材として好適な炭素繊
維球状体を得ることができる。そして、この炭素繊維球
状体を用いた炭素繊維複合成形体は、従来の長繊維を２
次元、３次元に編成したフェルトあるいはマットの使用
では得られなかった低密度で、弾力性に富み、さらに熱
的、電気的、力学的性質に等方性を示す炭素繊維複合成
形体であり、炭素系高温断熱材料あるいは炭素繊維強化
炭素材料として優れた材料である。また、この炭素繊維
球状体を賦活して得られる活性炭素繊維球状体は、軽量
で取扱いが容易で、濾過装置や吸着装置に充填した際の
圧力損失の増大が少なく各種フィルタ−や吸着処理装置
の充填剤として極めて優れた特性を有している。Detailed Description of the Invention [0001] [Industrial Application Field] The present invention is directed to a carbon fiber-reinforced carbon material or a carbon fiber composite molded article useful as a carbon-based high-temperature insulation material. The present invention relates to a fiber spheroid and a method for producing an activated carbon fiber spheroid using the same. [0002] Carbon fiber has excellent properties such as high strength, heat resistance, and corrosion resistance, and is used as carbon fiber reinforced carbon material,
It is a useful material as a base material or filler for composite materials such as carbon-based high-temperature insulation materials. In addition, the activated carbon fiber obtained by activating carbon fiber has a much thinner fiber diameter and higher contact efficiency than ordinary powder or granular activated carbon, so it has a fast adsorption rate and a low adsorption amount per unit weight. Because of its large amount, it is attracting attention as a filling material for various filters and adsorption layers. Conventionally, in manufacturing carbon fiber composite materials, carbon fibers are woven two-dimensionally or three-dimensionally into a felt or mat shape, and then a binder such as resin is added to form carbon fiber-reinforced carbon. The material is an intermediate base material (prepreg) or a carbon-based high-temperature insulation material. However, the manufacturing methods for these composite materials require the use of machines such as looms, and the resulting composite molded products use woven carbon fibers, so the carbon fibers are oriented in the vertical and horizontal directions. Anisotropy tends to occur in electrical properties, mechanical strength, etc. with respect to the arrangement direction. In addition, the woven material has a high bulk density and tends to be heavy when used as a heat insulating material or the like. Activated carbon fibers are usually used in the form of felt, nonwoven fabric, woven fabric, or paper, but they are difficult to handle when used in adsorption towers, etc., and they are difficult to handle when filled in large quantities. had the disadvantage of increased pressure loss. OBJECTS OF THE INVENTION The object of the present invention is to achieve low density, high elasticity, and high elasticity, which could not be obtained by conventional felts and mats made of two-dimensional or three-dimensional knitting of long fibers. A carbon fiber spherical body suitable as a base material or filler for a carbon fiber composite molded article useful as a carbon fiber-reinforced carbon material exhibiting isotropy in thermal, electrical, and mechanical properties or a carbon-based high-temperature insulation material, and lightweight. It is an object of the present invention to provide a method for producing activated carbon fiber spheres that are easy to handle, have little increase in pressure loss, and are suitable as fillers for various filters and adsorption treatment devices. [Means for Solving the Problems] In the process of studying composite materials using carbon fibers, the present inventors discovered that carbon fibers cut into short lengths tend to get tangled and form pilling during handling. As a result of our studies, we found that by adding a small amount of binder to chopped carbon fibers adjusted to an appropriate length and processing them under specific conditions, we were able to create a material that can be used as a base material for various composite materials. It was discovered that carbon fiber spheres useful as a filler and a precursor of activated carbon fibers can be obtained.
The invention has been completed. That is, the present invention is characterized in that chopped carbon fibers and a sizing agent are mixed and granulated using a device that exhibits rolling and flow action, so that the fibers are intertwined with each other and have a density of 0. 05 ~0.
A method for producing carbon fiber spheres having isotropic properties at 15 g/cm3, and fibers obtained by mixing and granulating chopped carbon fibers and a sizing agent using a device that exhibits rolling and flow action. are formed by intertwining with each other,
This is a method for producing activated carbon fiber spheres, which comprises activating carbon fiber spheres having a density of 0.05 to 0.15 g/cm3 and isotropic properties. The carbon fiber spheres of the present invention are manufactured by the following method. i.e. 0.5-30mm
The chopped carbon fibers adjusted to a length of are mixed with a sizing agent and granulated using a mixing or granulating device that exhibits rolling and fluidizing effects, such as an omni mixer or a pan pelletizer. The carbon fibers used here may be PAN-based, pitch-based, or any other type, and there are no particular limitations, such as high-strength products or general-purpose products. The sizing agent can be used depending on the purpose of the obtained carbon fiber spheres, and preferably water or PVA (polyvinyl alcohol).
, CMC (carboxymethylcellulose), aqueous solutions of water-soluble polymer compounds such as water-soluble acrylic resins, phenol
Organic solvent solutions of synthetic resins such as poly resins, epoxy resins, and furan resins can be used. The amount of the sizing agent used is sufficient so that it lightly adheres to the fiber surface, and in the case of water, it is preferably 10 to 50 wt% based on the weight of the fiber. If the length of the chopped carbon fiber is less than 0.5 mm, the fibers will not entangle with each other so much that it will not be possible to form a good sphere, and if it exceeds 30 mm, the rolling and flow effects will not be sufficiently exhibited, so it is preferable. do not have. This mixture,
The granulation process produces individual chopped carbon fibers.
The fibers become entangled with each other, and the fibers adhere and intertwine in a snowballing manner, resulting in a fluff-like spherical body. The carbon fiber spheres obtained by this method have a density of 0.0
It is extremely light at 5 to 0.15 g/cm3, and has a spherical or nearly spherical shape, with a sphere diameter of approximately 2 to 25 mm, most of which is approximately 4 to 20 mm, and is electrically, thermally, and physically strong. It exhibits isotropic properties and is suitable as an intermediate base material (prepreg) for carbon fiber-reinforced carbon materials or as a material for carbon-based high-temperature insulation materials. Furthermore, activated carbon fiber spheres having good properties can be obtained by subjecting the carbon fiber spheres obtained in this manner to an activation treatment. As the activation method, similar to the activation of ordinary activated carbon, gas activation using water vapor or carbon dioxide gas or activation using chemicals such as zinc chloride can be used, but the method for producing the activated carbon fiber spheres of the present invention , batch or continuous rotary
It is preferable to use a kiln and activate with steam or carbon dioxide gas at a temperature of 750° C. or higher. The carbon fiber spheres used here are spherical and easy to handle and disperse well in the rotary kiln, and also have good air permeability inside the spheres, so the activation reaction proceeds smoothly and the activation reaction is uniformly activated. Carbon fiber spheres can be obtained. The activated carbon fiber spheres obtained by the method of the present invention have a specific surface area of 500 to 2500 m2/g.
It is large in size and has a high rate of adsorption and desorption of gas and liquid components, so it is suitable for use as a filler in various deodorizing, gas separation, and solvent recovery devices, as well as as a battery material for electrodes in electric double layer capacitors. The carbon fiber spheres obtained by the method of the present invention are carbon fiber chopped fibers or short fibers, PVA, pulp, thermosetting resins such as phenol resins and epoxy resins, and thermosetting resins such as polyvinyl chloride. Binder components such as plastic resins are mixed, preferably wet mixed in a solvent such as water, filtered to remove the solvent, further molded into an arbitrary shape by pressing etc., and dried. Carbon fibers are bonded together through the carbon fibers, and a carbon fiber composite molded article having porous, lightweight, and isotropic properties can be obtained. The obtained carbon fiber composite molded body can be further subjected to carbonization treatment, if necessary, to form a molded body made only of carbon. The carbon fiber composite molded article thus obtained has a bulk density of 0.05 to 0.
2g/cm3, lightweight and highly elastic, electrical, thermal,
It is a molded body having isotropic properties in terms of strength, and is an extremely good material as a carbon-based high-temperature heat insulating material. Furthermore, there is a method in which chopped fibers and binder components are added and mixed, molded, and further carbonized if necessary, resulting in a molded body impregnated with a synthetic resin component, hardened, and further subjected to carbonization and graphitization treatment if necessary. be. In this method, chopped carbon fibers or short fibers and a binder component are mixed with carbon fiber spheres, preferably wet mixed in a solvent such as water, and then filtered to remove the solvent. Form into any shape using a press or the like and dry. By impregnating this molded body or a carbonized molded body with a synthetic resin component diluted with a solvent if necessary, drying and curing, a composite molded body of carbon fiber and synthetic resin can be obtained. By subsequently performing carbonization and further graphitization, a composite molded article in the form of a carbon fiber-reinforced carbon material can be obtained. Furthermore, it is also possible to arbitrarily control the density, etc. of the composite molded body by repeating treatments such as resin impregnation, carbonization, and graphitization. The carbon fiber composite molded product obtained by this method is a carbon fiber-reinforced synthetic resin and carbon fiber-reinforced carbon material that has isotropic properties in terms of electrical, thermal, and strength, and can be used for various structural materials, sliding materials, etc. Suitable as a material. [Example] The present invention will be explained in more detail with reference to the following example. (Example 1) 200 g of pitch-based carbon fiber chopped fibers with a fiber diameter of 10 μm and a fiber length of 3 mm were put into an omni mixer and operated. 50 g of water as a sizing agent was sprayed for 2 minutes, and the operation was continued for 5 minutes. After that, take it out from the mixer, remove the powder with a sieve, and
Carbon fiber spheres were obtained by drying at ℃ for 12 hours. The yield of the obtained spherical bodies was about 90%, and more than 80% of the spherical bodies had a substantially uniform diameter within the range of 4 to 6 mm. Furthermore, the density of each sphere was about 0.1 g/cm3, and it had lightweight, elastic, and isotropic properties. (Example 2) 100 g of the carbon fiber spheres obtained in Example 1 were heated to 900° C. in an inert atmosphere in a rotary kiln, and 80% of water vapor and 2 nitrogen were added.
Activation gas of 0% was introduced and activation treatment was performed at the same temperature for a predetermined time to obtain activated carbon fiber spheres. The results of measuring the specific surface area and adsorption capacity of the obtained carbon fiber spheres according to the method of JISK-1474 are as follows, and it can be seen that they have a large specific surface area and good adsorption capacity. Activation time Specific surface area Benzene equilibrium adsorption amount
(minutes) (N2
BET method) (wt%)
25
773 28.6
40 11
58 39.2
50 1575
44.9 [0011] [Effects of the Invention] According to the method of the present invention, a material suitable as a base material or a filler for a carbon fiber composite molded product, which is lightweight, easy to handle, and has high air permeability, which has not been previously obtained, can be obtained. Carbon fiber spheres can be obtained. The carbon fiber composite molded body using this carbon fiber spherical body can be made by converting conventional long fibers into two parts.
It is a carbon fiber composite molded product that has low density, high elasticity, and exhibits isotropy in thermal, electrical, and mechanical properties that could not be obtained by using felt or mat organized in three dimensions. It is an excellent material as a carbon-based high-temperature insulation material or a carbon fiber-reinforced carbon material. In addition, the activated carbon fiber spheres obtained by activating these carbon fiber spheres are lightweight and easy to handle, and there is little increase in pressure loss when filling them into filtration equipment or adsorption equipment. It has extremely excellent properties as a filler.
Claims (2)
剤とを、転動及び流動作用を示す装置により混合して造
粒することを特徴とする、繊維が相互に絡み合って形成
され、密度が ０．０５ 〜０．１５ ｇ／ｃｍ３ で
等方的性質を有する炭素繊維球状体の製造方法。1. A carbon fiber chopped fiber and a sizing agent are mixed and granulated using a device that exhibits rolling and flow action, and the fibers are intertwined with each other and have a density of 0. A method for producing carbon fiber spheres having isotropic properties at 0.05 to 0.15 g/cm3.
剤とを、転動及び流動作用を示す装置により混合して造
粒して得られる繊維が相互に絡み合って形成され、密度
が ０．０５ 〜０．１５ ｇ／ｃｍ３ で等方的性質
を有する炭素繊維球状体を賦活処理することを特徴とす
る活性炭素繊維球状体の製造方法。[Claim 2] Fibers obtained by mixing and granulating chopped carbon fibers and a sizing agent using a device that exhibits rolling and flow action are intertwined with each other, and have a density of 0.05 to 0. A method for producing activated carbon fiber spheres, which comprises activating carbon fiber spheres having isotropic properties at .15 g/cm3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3080607A JPH04300353A (en) | 1991-03-20 | 1991-03-20 | Production of spherical carbon fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3080607A JPH04300353A (en) | 1991-03-20 | 1991-03-20 | Production of spherical carbon fiber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04300353A true JPH04300353A (en) | 1992-10-23 |
Family
ID=13723020
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3080607A Pending JPH04300353A (en) | 1991-03-20 | 1991-03-20 | Production of spherical carbon fiber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04300353A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5639807A (en) * | 1994-08-05 | 1997-06-17 | Akzo Nobel Nv | Process for manufacturing carbon fiber pellets, the high density, streamlined pellets resulting therefrom and process for producing reinforced thermoplastic resins employing the pellets |
| EP0882558A1 (en) * | 1997-06-06 | 1998-12-09 | Kureha Chemical Industry Co., Ltd. | Carbon fiber ball and process for manufacturing the same |
| EP2308921A1 (en) * | 2009-10-09 | 2011-04-13 | Rockwool International A/S | Friction material with reduced noise, vibration and harshness generation, and process for the preparation thereof |
| WO2017170754A1 (en) * | 2016-03-30 | 2017-10-05 | 株式会社Ｌｉｘｉｌ | Granulated activated charcoal |
| CN115430202A (en) * | 2022-09-06 | 2022-12-06 | 苏州贝林微纤科技有限公司 | Large-bulk density paper fiber filter aid and preparation method and application thereof |
-
1991
- 1991-03-20 JP JP3080607A patent/JPH04300353A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5639807A (en) * | 1994-08-05 | 1997-06-17 | Akzo Nobel Nv | Process for manufacturing carbon fiber pellets, the high density, streamlined pellets resulting therefrom and process for producing reinforced thermoplastic resins employing the pellets |
| EP0882558A1 (en) * | 1997-06-06 | 1998-12-09 | Kureha Chemical Industry Co., Ltd. | Carbon fiber ball and process for manufacturing the same |
| US6194071B1 (en) | 1997-06-06 | 2001-02-27 | Kureha Chemical Industries Co., Ltd. | Carbon fiber ball and a process for manufacturing the same |
| EP2308921A1 (en) * | 2009-10-09 | 2011-04-13 | Rockwool International A/S | Friction material with reduced noise, vibration and harshness generation, and process for the preparation thereof |
| WO2011042533A1 (en) * | 2009-10-09 | 2011-04-14 | Rockwool International A/S | Friction material with reduced noise, vibration and harshness generation, and process for the preparation thereof |
| WO2017170754A1 (en) * | 2016-03-30 | 2017-10-05 | 株式会社Ｌｉｘｉｌ | Granulated activated charcoal |
| CN115430202A (en) * | 2022-09-06 | 2022-12-06 | 苏州贝林微纤科技有限公司 | Large-bulk density paper fiber filter aid and preparation method and application thereof |
| CN115430202B (en) * | 2022-09-06 | 2023-10-27 | 苏州贝林微纤科技有限公司 | Large bulk density paper fiber filter aid and preparation method and application thereof |
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