JPH0532819A - Conductive composition - Google Patents
Conductive compositionInfo
- Publication number
- JPH0532819A JPH0532819A JP31834491A JP31834491A JPH0532819A JP H0532819 A JPH0532819 A JP H0532819A JP 31834491 A JP31834491 A JP 31834491A JP 31834491 A JP31834491 A JP 31834491A JP H0532819 A JPH0532819 A JP H0532819A
- Authority
- JP
- Japan
- Prior art keywords
- group
- carbon fibers
- average diameter
- fiber
- resin
- 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.)
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Links
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- Curing Cements, Concrete, And Artificial Stone (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Conductive Materials (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、各種のケーシングや部
品などの構成部材を成形する材料として用いるために、
導電性を付与して静電気の帯電を防止できるようにした
導電性組成物に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used as a material for forming various casings, parts and other components.
The present invention relates to a conductive composition which is provided with conductivity and can prevent electrostatic charge.
【0002】[0002]
【従来の技術】近年では、各種の電気機器において、マ
イクロコンピュータなどの電子回路部品が使用され、そ
れらが、周囲の帯電した静電気によって悪影響を及ぼさ
れる問題があり、上述のような導電性組成物として、従
来、カーボンブラック、ケッチェンブラック(AKZO
社商標) 、金属繊維、金属粉、炭素繊維などの導電性充
填材を、樹脂やゴム等に複合するものが提案されてい
る。2. Description of the Related Art In recent years, electronic circuit components such as microcomputers have been used in various electric devices, and there is a problem that they are adversely affected by static electricity charged in the surroundings. Conventionally, carbon black, Ketjen black (AKZO
It has been proposed to combine a conductive filler such as a trademark (trademark), metal fiber, metal powder, and carbon fiber with resin or rubber.
【0003】[0003]
【発明が解決しようとする課題】しかしながら、例え
ば、樹脂にカーボンブラック、ケッチェンブラックおよ
び金属粉などの導電性充填材を充填して導電性を付与す
る場合には、その充填量を多くしなければならず、これ
によって得られる導電性樹脂組成物のメルトフローレー
ト値(またはメルトインデックスMI)が低下し、溶融
流動性が悪くなり、例えば、射出成形の場合であれば、
その射出圧力を高くしなければならないとか、高いシリ
ンダ温度が必要で冷却に時間がかかるなど、成形サイク
ルに支障を来す問題を発生するとともに、得られた成形
品の衝撃強度が低下する欠点があった。However, for example, when the resin is filled with a conductive filler such as carbon black, Ketjen black and metal powder to impart conductivity, the filling amount must be increased. In this case, the melt flow rate value (or melt index MI) of the conductive resin composition obtained thereby decreases and the melt fluidity deteriorates. For example, in the case of injection molding,
There is a problem that the injection pressure must be increased, a high cylinder temperature is required, and cooling takes time, which causes problems that interfere with the molding cycle and the impact strength of the obtained molded product decreases. there were.
【0004】また、着色を必要とする場合においては、
カーボンブラックやケッチェンブラックを用いると着色
が困難になる欠点があった。When coloring is required,
The use of carbon black or Ketjen black has a drawback that coloring is difficult.
【0005】また、引張強度や曲げ強度を十分高くする
ことができない欠点があった。また、金属繊維や炭素繊
維を充填して導電性を付与する場合でも、その繊維長が
1mm以下のミルドファイバーでは、前述の場合と同様に
充填量を多くしなければならず、同様の欠点があった。Further, there is a drawback that the tensile strength and bending strength cannot be sufficiently increased. In addition, even when metal fibers or carbon fibers are filled to provide conductivity, the fiber length is
With a milled fiber of 1 mm or less, the filling amount had to be increased as in the case described above, and the same drawback was encountered.
【0006】そこで、カーボンブラック、ケッチェンブ
ラックまたは金属粉と、補強材としての金属繊維または
炭素繊維とを併用して導電性熱可塑性樹脂組成物を構成
することも考えられたが、この導電性熱可塑性樹脂組成
物を用いて射出成形する場合、金型のゲート部分での流
動抵抗に起因して充填材の分離が起こり、併用した充填
材が均一に流れにくく、得られた成形品において導電性
や強度が不均一になりやすい欠点があった。Therefore, it has been considered that carbon black, ketjen black or metal powder is used in combination with metal fiber or carbon fiber as a reinforcing material to form a conductive thermoplastic resin composition. When injection molding is performed using a thermoplastic resin composition, the filler is separated due to the flow resistance at the gate portion of the mold, the filler used together is difficult to flow evenly, and the resulting molded article is electrically conductive. There was a drawback that the properties and strength tended to be non-uniform.
【0007】本発明は、このような事情に鑑みてなされ
たものであって、均一かつ良好な導電性および強度を有
する成形品を得ることができる導電性組成物を提供する
ことを目的とする。The present invention has been made in view of the above circumstances, and an object thereof is to provide a conductive composition capable of obtaining a molded article having uniform and good conductivity and strength. .
【0008】[0008]
【課題を解決するための手段】請求項1に係る発明の導
電性組成物は、上述のような目的を達成するために、炭
素繊維を母材に混入複合して得られる導電性組成物にお
いて、炭素繊維が、平均直径の大きいもの(A群とす
る)と小さいもの(B群とする)とから成り、かつ、B
群の炭素繊維の平均直径がA群の炭素繊維の平均直径の
0.05倍以上、 0.8倍以下であることを特徴としている。A conductive composition of the invention according to claim 1 is a conductive composition obtained by mixing carbon fibers into a matrix to achieve the above object. , The carbon fibers consist of those having a large average diameter (A group) and those having a small average diameter (B group), and B
The average diameter of the carbon fibers of group A is the average diameter of the carbon fibers of group A
It is characterized by being more than 0.05 times and less than 0.8 times.
【0009】すなわち、繊維長さを同じとした場合、等
重量の炭素繊維を混入するためには、平均直径の大きな
A群の炭素繊維では本数が少なく、平均直径の小さいB
群の炭素繊維では本数が多くなる。そこで、平均直径の
大きなA群の炭素繊維とそのA群の炭素繊維の平均直径
の0.05倍以上、 0.8倍以下となる平均直径の小さいB群
の炭素繊維とを混合し、平均直径の小さいB群の炭素繊
維のみを充填する場合の溶融流動性を抑制しながら、導
電性の向上を図るように構成する。A群の炭素繊維の平
均直径の0.05倍未満であるときも、 0.8倍を越えるとき
もともに溶融流動性が悪くなるとともに強度が不均一と
なるからである。That is, in the case where the fiber lengths are the same, in order to mix carbon fibers of the same weight, the number of carbon fibers of the group A having a large average diameter is small and the number B of carbon fibers having a small average diameter is used.
The number of carbon fibers in the group is large. Therefore, a group A carbon fiber having a large average diameter and a group B carbon fiber having a small average diameter which is 0.05 times or more and 0.8 times or less the average diameter of the group A carbon fiber are mixed to obtain a group B small diameter. It is configured to improve the conductivity while suppressing the melt fluidity when only the carbon fibers of the group are filled. This is because both when the average diameter of the carbon fibers of Group A is less than 0.05 times and when it exceeds 0.8 times, the melt fluidity deteriorates and the strength becomes nonuniform.
【0010】炭素繊維としては、平均直径の異なるピッ
チ系、ポリアクリロニトリル(PAN)系、フェノール
系、レーヨン系等各種のものから複数種を選んで組み合
わせて使用できる。また、母材としては、熱硬化性樹脂
や熱可塑性樹脂といった樹脂、ゴム、セメントが好適で
ある。As the carbon fiber, a plurality of carbon fibers having different average diameters such as pitch type, polyacrylonitrile (PAN) type, phenol type and rayon type can be selected and used in combination. Further, as the base material, resin such as thermosetting resin or thermoplastic resin, rubber, or cement is suitable.
【0011】熱可塑性樹脂としては、ポリエチレン、ポ
リプロピレン、ポリスチレン、アクリル樹脂、ポリエチ
レンテレフタレート、ポリブチレンテレフタレート、ポ
リエステル、ポリアミド、ポリアセタール、ポリスルホ
ン、ポリエーテルスルホン、ポリフェニレンスルフィ
ド、ポリフェニレンオキサイド、ポリアリレート、ポリ
エーテルベンジレン、ポリエーテルエーテルケトン、ポ
リアミドイミド、ポリエーテルイミド、ポリアミノビス
マレイミド、芳香族ポリアミド、エチレンプロピレン共
重合樹脂、エチレン酢酸ビニル共重合樹脂、エチレンア
クリル酸共重合樹脂、塩化ビニル樹脂、ABS樹脂など
が使用される。As the thermoplastic resin, polyethylene, polypropylene, polystyrene, acrylic resin, polyethylene terephthalate, polybutylene terephthalate, polyester, polyamide, polyacetal, polysulfone, polyether sulfone, polyphenylene sulfide, polyphenylene oxide, polyarylate, polyether benzylene. , Polyether ether ketone, polyamide imide, polyether imide, polyamino bismaleimide, aromatic polyamide, ethylene propylene copolymer resin, ethylene vinyl acetate copolymer resin, ethylene acrylic acid copolymer resin, vinyl chloride resin, ABS resin, etc. To be done.
【0012】熱硬化性樹脂としては、エポキシ樹脂、不
飽和ポリエステル樹脂、フェノール樹脂などが使用され
る。As the thermosetting resin, epoxy resin, unsaturated polyester resin, phenol resin and the like are used.
【0013】熱可塑性樹脂と炭素繊維を混合するとき
は、これらの各一種以上を各種押出成型機、ニーダー、
ミキシングロール等の溶融混練装置に供給する。溶融混
練装置で混合した樹脂組成物を、得ようとする成形品に
応じた所定形状の金型内に供給し、射出成形などによっ
て成形する。When the thermoplastic resin and the carbon fiber are mixed, one or more of each of them may be mixed with various extruders, kneaders,
It is supplied to a melt-kneading device such as a mixing roll. The resin composition mixed by the melt-kneading device is supplied into a mold having a predetermined shape according to the molded product to be obtained, and molded by injection molding or the like.
【0014】また、A群の炭素繊維とB群の炭素繊維と
の合計重量に対する前記A群の炭素繊維の配合割合は65
〜85%であるのが好ましい。65%未満であると、平均直
径の小さいB群の炭素繊維の充填量が多くなり、溶融流
動性が悪くなって成形サイクルに支障を来す問題を発生
するとともに強度が低下し、一方、85%を越えると、平
均直径の大きいA群の炭素繊維の充填量が多くなり、成
形時に均一に流れにくく、得られた成形品において導電
性や強度が不均一になりやすいからである。Further, the mixing ratio of the carbon fiber of the group A to the total weight of the carbon fiber of the group A and the carbon fiber of the group B is 65.
It is preferably ˜85%. If it is less than 65%, the filling amount of the carbon fibers of the group B having a small average diameter increases, the melt flowability deteriorates, which causes a problem in the molding cycle, and the strength decreases, while If it exceeds%, the filling amount of the carbon fibers of the group A having a large average diameter becomes large, it is difficult to flow uniformly during molding, and the conductivity and strength of the obtained molded product are likely to be uneven.
【0015】また、A群およびB群の炭素繊維の合計重
量の組成物全体に占める割合は5〜20重量部であるのが
好ましい。5重量部未満であると、導電性が低下し、一
方、20重量部を越えると、溶融流動性が悪くなり、成形
サイクルが低下するからである。The ratio of the total weight of the carbon fibers of Group A and Group B to the total composition is preferably 5 to 20 parts by weight. If it is less than 5 parts by weight, the conductivity will decrease, while if it exceeds 20 parts by weight, the melt fluidity will deteriorate and the molding cycle will decrease.
【0016】[0016]
【作用】本発明の導電性組成物の構成によれば、平均直
径の大きなA群の炭素繊維と平均直径の小さなB群の炭
素繊維との組み合わせにより高密度化が図れるとともに
繊維どうしの接触を良好にして導電性と強度を増大する
ことができる。According to the constitution of the electrically conductive composition of the present invention, the combination of the carbon fibers of group A having a large average diameter and the carbon fibers of group B having a small average diameter can achieve high density and contact between fibers. It can be improved to increase conductivity and strength.
【0017】[0017]
【実施例】次に、本発明の実施例を図面に基づいて詳細
に説明する。Embodiments of the present invention will now be described in detail with reference to the drawings.
【0018】実施例1
ポリプロピレン樹脂84重量部に、平均直径が13μmのピ
ッチ系炭素繊維(S−244:株式会社ドナック製)を
0.7mmの平均繊維長に調製したA群の炭素繊維としての
ミルドファイバー11重量部と、平均直径が 7μmのPA
N系炭素繊維を6mmの平均繊維長に調製して収束された
B群の炭素繊維としてのチョップドファイバー 5重量部
とを、二台の定量供給フィーダーによるサイドフィード
により二軸同方向押出成型機で 230〜240 ℃で混練し、
ストランド状に押出し、水冷などにより冷却しながら切
断して長さ 3mmで直径が 4mmのペレットを作成した。Example 1 Pitch-based carbon fiber having an average diameter of 13 μm (S-244: manufactured by Donac Co.) was added to 84 parts by weight of polypropylene resin.
11 parts by weight of milled fiber as a carbon fiber of group A prepared to have an average fiber length of 0.7 mm and PA having an average diameter of 7 μm
5 parts by weight of chopped fiber as group B carbon fiber, which was prepared by consolidating N-based carbon fiber to an average fiber length of 6 mm, and 5 parts by weight of chopped fiber were side-fed by two fixed-quantity feeding feeders in a twin-screw co-directional extruder. Knead at 230-240 ℃,
It was extruded in strands and cut while cooling with water, etc. to make pellets with a length of 3 mm and a diameter of 4 mm.
【0019】前記実施例1で使用する二軸同方向押出成
型機Aは、図1の側面図に示すように、押出方向上手側
に、樹脂を供給する第1の定量供給フィーダー1を設け
るとともに、途中箇所に形成した投入口2に、ミルドフ
ァイバーを供給する第2の定量供給フィーダー3とチョ
ップドファイバーを供給する第3の定量供給フィーダー
4とを設けて構成されている。図中5は、二軸同方向押
出成型機Aから押出されて冷却されたストランド状物を
切断するカット機(ペレタイザー)を示している。As shown in the side view of FIG. 1, the twin-screw same-direction extrusion molding machine A used in the first embodiment is provided with a first fixed-quantity supply feeder 1 for supplying resin on the upstream side in the extrusion direction. A second fixed quantity supply feeder 3 for supplying the milled fiber and a third constant quantity supply feeder 4 for supplying the chopped fiber are provided in the charging port 2 formed in the middle. In the figure, reference numeral 5 denotes a cutting machine (pelletizer) for cutting the cooled strand-shaped material extruded from the biaxial co-directional extrusion molding machine A.
【0020】実施例2
ポリプロピレン樹脂87重量部と、平均直径が13μmのピ
ッチ系炭素繊維(S−244:株式会社ドナック製)を
0.7mmの平均繊維長に調製したA群の炭素繊維のミルド
ファイバー 9重量部を混合機(タンブラー)で10分間混
合した後に元フィードを行い、更に、平均直径が 7μm
のPAN系炭素繊維を 6mmの平均繊維長に調製して収束
されたB群の炭素繊維のチョップドファイバー 4重量部
を、定量供給フィーダーによるサイドフィードにより二
軸同方向押出成型機で混練し、前述実施例1と同様にし
て長さ 3mmで直径が 4mmのペレットを作成した。Example 2 87 parts by weight of polypropylene resin and pitch-based carbon fiber having an average diameter of 13 μm (S-244: manufactured by Donac Co., Ltd.)
After mixing 9 parts by weight of milled fibers of group A carbon fibers prepared to an average fiber length of 0.7 mm with a mixer (tumbler) for 10 minutes, the original feed was performed, and the average diameter was 7 μm.
4 parts by weight of the chopped fibers of the group B carbon fibers prepared by adjusting the PAN-based carbon fiber of 6 mm to the average fiber length of 6 mm and kneading them with a biaxial co-direction extrusion molding machine by side-feeding with a constant-rate feeder. Pellets having a length of 3 mm and a diameter of 4 mm were prepared in the same manner as in Example 1.
【0021】前述した元フィードを行う押出成型機B
は、図2の側面図に示すように、押出方向上手側に、樹
脂とミルドファイバーとの混合物を供給する定量供給フ
ィーダー11を設けて構成されている。図中12は、押
出成型機Bから押出されて冷却されたストランド状物を
切断するカット機(ペレタイザー)を示している。Extruder B for performing the above-mentioned original feed
As shown in the side view of FIG. 2, a constant quantity supply feeder 11 for supplying a mixture of resin and milled fiber is provided on the upstream side in the extrusion direction. In the figure, reference numeral 12 denotes a cutting machine (pelletizer) for cutting the cooled strand-shaped material extruded from the extrusion molding machine B.
【0022】前記実施例2で使用する二軸同方向押出成
型機Cは、図3の側面図に示すように、押出方向上手側
に、樹脂とミルドファイバーとの混合物を供給する第1
の定量供給フィーダー21を設けるとともに、途中箇所
に形成した投入口22に、チョップドファイバーを供給
する第2の定量供給フィーダー23とを設けて構成され
ている。図中24は、二軸同方向押出成型機Aから押出
されて冷却されたストランド状物を切断するカット機
(ペレタイザー)を示している。As shown in the side view of FIG. 3, the twin-screw co-directional extrusion molding machine C used in the second embodiment supplies the mixture of the resin and the milled fiber to the upstream side in the extrusion direction.
In addition to providing the constant amount supply feeder 21 of No. 2, a second constant amount supply feeder 23 for supplying chopped fiber is provided at an input port 22 formed at an intermediate position. In the figure, reference numeral 24 represents a cutting machine (pelletizer) for cutting the strand-like material that has been extruded from the twin-screw co-direction extrusion molding machine A and cooled.
【0023】比較例1
ポリプロピレン樹脂82重量部に、平均直径が13μmのピ
ッチ系炭素繊維(S−244:株式会社ドナック製)を
0.7mmの平均繊維長に調製したミルドファイバー18重量
部を前述した二軸同方向押出成型機Cで混練した。その
後ストランド状に押出し、水冷などにより冷却しながら
切断して長さ 3mmで直径が 4mmのペレットを作成した。Comparative Example 1 Pitch-based carbon fiber having an average diameter of 13 μm (S-244: manufactured by Donac Co.) was added to 82 parts by weight of polypropylene resin.
18 parts by weight of milled fiber prepared to have an average fiber length of 0.7 mm was kneaded by the above-mentioned biaxial co-direction extruder C. After that, it was extruded into a strand shape and cut while cooling with water or the like to prepare a pellet with a length of 3 mm and a diameter of 4 mm.
【0024】比較例2
ポリプロピレン樹脂80重量部と、増量材としてのタルク
10重量部とを混合機(タンブラー)で30分間混合した。
その後前述した押出機Bで元フィードを行い、平均直径
が 7μmのPAN系炭素繊維を 6mmの平均繊維長に調製
して収束されたチョップドファイバー10重量部をサイド
フィードした以外は比較例1と同様にして長さ 3mmで直
径が 4mmのペレットを作成した。Comparative Example 2 80 parts by weight of polypropylene resin and talc as an extender
10 parts by weight were mixed with a mixer (tumbler) for 30 minutes.
After that, the above-mentioned extruder B was used to perform the original feed, and the PAN-based carbon fiber having an average diameter of 7 μm was prepared to have an average fiber length of 6 mm, and 10 parts by weight of the converged chopped fiber was side-feeded. Then, a pellet with a length of 3 mm and a diameter of 4 mm was prepared.
【0025】比較例3
ポリプロピレン樹脂を65重量部とし、平均直径が13μm
のピッチ系炭素繊維(S−244:株式会社ドナック
製)を 0.7mmの平均繊維長に調製したミルドファイバー
を25重量部に変えた以外は比較例2と同様にして長さ 3
mmで直径が 4mmのペレットを作成した。Comparative Example 3 Polypropylene resin was 65 parts by weight, and the average diameter was 13 μm.
The pitch-based carbon fiber (S-244: manufactured by Donac Co., Ltd.) was prepared to have an average fiber length of 0.7 mm, and the milled fiber was changed to 25 parts by weight in the same manner as in Comparative Example 2.
Pellets with a diameter of 4 mm and a diameter of 4 mm were prepared.
【0026】比較例4
ポリプロピレン樹脂を60重量部とし、平均直径が13μm
のピッチ系炭素繊維(S−244:株式会社ドナック
製)を 0.7mmの平均繊維長に調製したミルドファイバー
を30重量部に変えた以外は比較例2と同様にして長さ 3
mmで直径が 4mmのペレットを作成した。Comparative Example 4 60 parts by weight of polypropylene resin was used, and the average diameter was 13 μm.
The pitch-based carbon fiber (S-244: manufactured by Donac Co., Ltd.) was prepared to have an average fiber length of 0.7 mm, and the milled fiber was changed to 30 parts by weight in the same manner as in Comparative Example 2.
Pellets with a diameter of 4 mm and a diameter of 4 mm were prepared.
【0027】実施例3
ポリプロピレン樹脂に変えてABS樹脂のみを用いた以
外は実施例1と同様にして長さ 3mmで直径が 4mmのペレ
ットを作成した。Example 3 A pellet having a length of 3 mm and a diameter of 4 mm was prepared in the same manner as in Example 1 except that only ABS resin was used instead of polypropylene resin.
【0028】実施例4
ポリプロピレン樹脂に変えてABS樹脂のみを用いた以
外は実施例2と同様にして長さ 3mmで直径が 4mmのペレ
ットを作成した。Example 4 A pellet having a length of 3 mm and a diameter of 4 mm was prepared in the same manner as in Example 2 except that only ABS resin was used instead of polypropylene resin.
【0029】比較例5
ポリプロピレン樹脂に変えてABS樹脂のみを用いた以
外は比較例1と同様にして長さ 3mmで直径が 4mmのペレ
ットを作成した。Comparative Example 5 A pellet having a length of 3 mm and a diameter of 4 mm was prepared in the same manner as in Comparative Example 1 except that only ABS resin was used instead of polypropylene resin.
【0030】実施例5
ポリプロピレン樹脂89重量部と、平均直径1μmのPA
N系炭素繊維を0.15mmの平均繊維長に調製したB群の炭
素繊維のミルドファイバー2重量部とを混合機(タンブ
ラー)で 5分間混合した。その後前述した押出成型機B
で元フィードを行い、平均直径が 7μmのPAN系炭素
繊維を 6mmの平均繊維長に調製して収束されたA群の炭
素繊維のチョップドファイバー9重量部を定量供給フィ
ーダーによるサイドフィードにより前述した二軸同方向
押出成型機Cで混練し、実施例1と同様にして長さ 3mm
で直径が 4mmのペレットを作成した。Example 5 89 parts by weight of polypropylene resin and PA having an average diameter of 1 μm
Two parts by weight of milled fibers of group B carbon fibers prepared by preparing N-based carbon fibers to an average fiber length of 0.15 mm were mixed for 5 minutes with a mixer (tumbler). After that, the extruder B described above
The PAN-based carbon fiber having an average diameter of 7 μm was prepared to have an average fiber length of 6 mm, and 9 parts by weight of the chopped fiber of the group A carbon fiber which had been converged were side-fed by a constant-rate feeder. Kneading with the co-axial extrusion molding machine C, and in the same manner as in Example 1, length 3 mm
A pellet with a diameter of 4 mm was prepared by.
【0031】次に、上述実施例1、実施例2、実施例
3、実施例4、実施例5、比較例1および比較例5それ
ぞれの各ペレットを用いて射出成形により成形品を得、
また、比較例2、比較例3および比較例4それぞれの各
ペレットを用いて押出成形により成形品を得、それらの
成形品を試験体として行った表面抵抗および摩擦帯電量
それぞれの測定結果について説明する。Next, a molded article was obtained by injection molding using the pellets of each of the above-mentioned Example 1, Example 2, Example 3, Example 4, Example 5, Comparative Example 1 and Comparative Example 5,
In addition, the respective pellets of Comparative Example 2, Comparative Example 3 and Comparative Example 4 were used to obtain a molded product by extrusion molding, and the measured results of the surface resistance and the triboelectric charge amount, which were obtained by using the molded product as a test body, will be described. To do.
【0032】表面抵抗の測定としては、図4に示すよう
に、10mm幅の試験体31の表面に長手方向に10mmの間隔
を隔てて導電性塗料を塗布した後に、温度23℃で湿度50
%の恒温室で24時間乾燥し、塗料塗布部分D,Dを抵抗
計32を介装した電気配線33で接続し、温度23℃で湿
度50%の恒温室において、所定電圧を印加して表面抵抗
を測定した。To measure the surface resistance, as shown in FIG. 4, a conductive coating material was applied to the surface of a test body 31 having a width of 10 mm at intervals of 10 mm in the longitudinal direction, and then at a temperature of 23 ° C. and a humidity of 50.
% In a temperature-controlled room for 24 hours, and the paint-coated parts D and D are connected by electrical wiring 33 with a resistance meter 32 interposed between them, and a predetermined voltage is applied to the surface in a temperature-controlled room at a temperature of 23 ° C. and a humidity of 50%. The resistance was measured.
【0033】一方、摩擦帯電量は、摩擦帯電圧測定法
(JIS L 1094のB法に準拠)に基づき、温度23℃で湿度
50%の恒温室において24時間放置した試験片を、綿布 3
号により、それぞれ 1分間、 3分間、 5分間摩擦して摩
擦帯電圧を測定した。得られた表面抵抗および摩擦帯電
量それぞれの測定結果を表−1に示す。On the other hand, the triboelectrification amount is based on the friction electrification voltage measurement method (in accordance with JIS L 1094 B method) and the humidity at a temperature of 23 ° C.
A test piece left for 24 hours in a 50% thermostatic chamber was
The frictional electrification voltage was measured by rubbing for 1 minute, 3 minutes, and 5 minutes, respectively. Table 1 shows the measurement results of the obtained surface resistance and triboelectric charge amount.
【0034】また、成形体をホットプレスで 0.2mmのフ
ィルムに作成し、顕微鏡(倍率:100)によって測定する
とともに算出した炭素繊維のアスペクト比(成形後の平
均繊維長/平均直径)を示す。Further, the aspect ratio (average fiber length / average diameter after molding) of the carbon fiber, which was prepared by forming a molded product into a 0.2 mm film by hot pressing and measuring it with a microscope (magnification: 100), is shown.
【0035】 表−1 摩擦帯電量(V) アスペクト比 表面抵抗(Ω) 帯 電 時 間 ミルド チョップド 1分 3分 5分 ファイバー ファイバー 実施例1 2.6×104 60 69 70 23 86 実施例2 4.5×104 75 100 130 21 92 比較例1 1.8×105 140 170 170 23 − 比較例2 8.2×103 260 270 270 − 114 比較例3 7.0×103 83 85 85 19 − 比較例4 1.7×102 73 75 75 19 − 実施例3 3.0×104 100 110 110 20 86 実施例4 2.0×105 129 169 181 20 85 比較例5 3.2×105 140 170 170 21 − 実施例5 3.9×104 140 165 180 51 90Table-1 Amount of Triboelectric Charge (V) Aspect Ratio Surface Resistance (Ω) Charging Time Milled Chopped 1 min 3 min 5 min Fiber Fiber Example 1 2.6 × 10 4 60 69 70 23 86 Example 2 4.5 × 10 4 75 100 130 21 92 Comparative Example 1 1.8 × 10 5 140 170 170 23-Comparative Example 2 8.2 × 10 3 260 270 270-114 Comparative Example 3 7.0 × 10 3 83 85 85 19-Comparative Example 4 1.7 × 10 2 73 75 75 19 − Example 3 3.0 × 10 4 100 110 110 20 86 Example 4 2.0 × 10 5 129 169 181 18 20 85 Comparative Example 5 3.2 × 10 5 140 170 170 21 − Example 5 3.9 × 10 4 140 165 180 51 90
【0036】また、各実施例および比較例それぞれに
おける組成物全体に占める炭素繊維の割合、ならびに、
各実施例それぞれにおける平均直径の大きいA群の炭素
繊維と平均直径の大きいB群の炭素繊維との合計重量に
対する前記A群の炭素繊維の配合割合を求めれば、表−
2に示す通りである。The proportion of carbon fibers in the entire composition in each of the examples and comparative examples, and
In each of the examples, the compounding ratio of the group A carbon fibers to the total weight of the group A carbon fibers having a large average diameter and the group B carbon fibers having a large average diameter was calculated.
As shown in 2.
【0037】 表−2 炭素繊維の割合 A群の炭素繊維の配合割合 (重量部) (%) 実施例1 16 68.75 実施例2 13 69.23 比較例1 18 − 比較例2 10 − 比較例3 25 − 比較例4 30 − 実施例3 16 68.75 実施例4 13 69.23 比較例5 18 − 実施例5 11 81.82 [0037] Table-2 Ratio of carbon fiber Mixing ratio of carbon fiber of group A (Part by weight) (%) Example 1 16 68.75 Example 2 13 69.23 Comparative Example 1 18 − Comparative Example 2 10 − Comparative Example 3 25 − Comparative Example 4 30 − Example 3 16 68.75 Example 4 13 69.23 Comparative Example 5 18 − Example 5 11 81.82
【0038】上記結果から、熱可塑性樹脂としてポリ
プロピレン樹脂を用いた場合(実施例1、2および5、
比較例1、2、3および4)において、実施例1および
2の場合に、比較例3および4におけるよりも組成物全
体に対する炭素繊維の割合が十分少ないにもかかわら
ず、摩擦帯電量を同等にまで減少できており、また、実
施例5の場合に、比較例1におけるよりも組成物全体に
対する炭素繊維の割合が十分少ないにもかかわらず、摩
擦帯電量を同等にまで減少できており、更に、比較例2
の場合は、組成物全体に対する炭素繊維の割合が少ない
が、それとほぼ等量の実施例5に比べて摩擦帯電量が顕
著に多くなっており、本発明の実施例によれば、炭素繊
維の少量の添加により摩擦帯電量を減少できており、静
電気の帯電を良好に防止できることが明らかであった。From the above results, when polypropylene resin was used as the thermoplastic resin (Examples 1, 2 and 5,
In Comparative Examples 1, 2, 3 and 4), in the case of Examples 1 and 2, the triboelectrification amount was the same as that in Comparative Examples 3 and 4, although the ratio of the carbon fibers to the entire composition was sufficiently small. In the case of Example 5, the triboelectrification amount could be reduced to the same level even though the ratio of the carbon fibers to the entire composition was sufficiently smaller than in Comparative Example 1 in the case of Example 5. Furthermore, Comparative Example 2
In the case of, the ratio of the carbon fibers to the entire composition was small, but the triboelectric charge amount was remarkably larger than that of Example 5, which was almost the same as that of the composition. According to the examples of the present invention, It was clear that the triboelectrification amount could be reduced by adding a small amount and the electrostatic charge could be well prevented.
【0039】一方、ABS樹脂を用いた場合(実施例3
および4、ならびに、比較例5)において、実施例3の
場合に、比較例5の場合よりも組成物全体に対する炭素
繊維の割合が少ないにもかかわらず、摩擦帯電量を十分
減少できており、また、実施例4の場合に、減少できて
いる摩擦帯電量においてほぼ同等であるにもかかわら
ず、組成物全体に対する炭素繊維の割合が少なく、本発
明の実施例によれば、炭素繊維の少量の添加により摩擦
帯電量を減少できており、静電気の帯電を良好に防止で
きることが明らかであった。On the other hand, when ABS resin is used (Example 3)
In Examples 4 and 4 and Comparative Example 5), the triboelectric charge amount could be sufficiently reduced in the case of Example 3, although the ratio of the carbon fibers to the entire composition was smaller than that in Comparative Example 5. In addition, in the case of Example 4, although the amount of triboelectricity that can be reduced is almost the same, the ratio of carbon fiber to the entire composition is small, and according to the example of the present invention, a small amount of carbon fiber is used. It was clear that the addition of the compound could reduce the triboelectrification amount, and could effectively prevent electrostatic charge.
【0040】前述した実施例2、4および5、ならび
に、比較例2、3および4それぞれにおいて、混合機
(タンブラー)で母材と炭素繊維とを混合する際に炭素
繊維が毛玉状になった場合には、粒径の小さいカーボン
ブラックを1重量部程度加えて再度混合することによ
り、毛玉を少なくすることができる。In the above-mentioned Examples 2, 4 and 5 and Comparative Examples 2, 3 and 4, when the base material and the carbon fibers were mixed with a mixer (tumbler), the carbon fibers became pill-like. In this case, by adding about 1 part by weight of carbon black having a small particle size and mixing again, the number of pills can be reduced.
【0041】本発明としては、例えば、A群の炭素繊維
として平均直径18μmのPAN系炭素繊維を用い、一
方、B群の炭素繊維として平均直径1μmのPAN系炭
素繊維を用いるとか、あるいは、A群の炭素繊維として
平均直径13μmのピッチ系炭素繊維を用い、一方、B群
の炭素繊維として平均直径10μmのPAN系炭素繊維を
用いるとか、更には、A群の炭素繊維として平均直径18
μmのピッチ系炭素繊維を用い、一方、B群の炭素繊維
として平均直径13μmのピッチ系炭素繊維を用いるな
ど、要するに、B群の炭素繊維の平均直径がA群の炭素
繊維の平均直径の0.05倍以上、 0.8倍以下になるもので
あれば、各種の組み合わせが可能である。In the present invention, for example, PAN-based carbon fibers having an average diameter of 18 μm are used as the group A carbon fibers, while PAN-based carbon fibers having an average diameter of 1 μm are used as the group B carbon fibers. Pitch-based carbon fibers having an average diameter of 13 μm are used as the group carbon fibers, while PAN-based carbon fibers having an average diameter of 10 μm are used as the group B carbon fibers, and further, average diameter 18 is used as the group A carbon fibers.
Pitch-based carbon fibers of μm are used, meanwhile, pitch-based carbon fibers of 13 μm in average diameter are used as the carbon fibers of group B. In short, the average diameter of the carbon fibers of group B is 0.05 of the average diameter of the carbon fibers of group A. Various combinations are possible as long as they are more than double and less than 0.8.
【0042】[0042]
【発明の効果】以上の説明から明らかなように、本発明
の導電性組成物によれば、平均直径の大きなA群の炭素
繊維と平均直径の小さなB群の炭素繊維との協働によっ
て、全体としての炭素繊維の充填量を少なくしながら良
好な導電性と十分な強度を付与することができるから、
得られる導電性組成物のメルトフローレート値の低下を
抑制でき、成形サイクルへの悪影響を回避して良好に成
形できるようになった。As is apparent from the above description, according to the conductive composition of the present invention, the group A carbon fiber having a large average diameter and the group B carbon fiber having a small average diameter cooperate with each other. Since it is possible to impart good conductivity and sufficient strength while reducing the filling amount of carbon fiber as a whole,
A decrease in the melt flow rate value of the obtained conductive composition can be suppressed, and adverse effects on the molding cycle can be avoided, enabling favorable molding.
【図1】二軸同方向押出成型機の概略側面図である。FIG. 1 is a schematic side view of a twin-screw co-directional extruder.
【図2】押出成型機の概略側面図である。FIG. 2 is a schematic side view of an extruder.
【図3】二軸同方向押出成型機の概略側面図である。FIG. 3 is a schematic side view of a twin-screw co-directional extruder.
【図4】導電性の測定装置の拡大概念図である。FIG. 4 is an enlarged conceptual diagram of a conductivity measuring device.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 FI 技術表示箇所 //(C04B 28/02 14:38) A 2102−4G (72)発明者 東山 勝 大阪市中央区平野町四丁目1番2号 大阪 瓦斯株式会社内─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification number Office reference number FI Technical indication location // (C04B 28/02 14:38) A 2102-4G (72) Inventor Masaru Higashiyama Osaka City Central 4-1-2, Hirano-cho, Ward, Osaka Gas Co., Ltd.
Claims (2)
導電性組成物において、前記炭素繊維が、平均直径の大
きいもの(A群とする)と小さいもの(B群とする)と
から成り、かつ、B群の炭素繊維の平均直径がA群の炭
素繊維の平均直径の0.05倍以上、 0.8倍以下であること
を特徴とする導電性組成物。1. A conductive composition obtained by mixing carbon fibers into a base material to form a composite, wherein the carbon fibers have a large average diameter (A group) and a small average diameter (B group). And the average diameter of the carbon fibers of group B is not less than 0.05 times and not more than 0.8 times the average diameter of the carbon fibers of group A.
セメントのいずれかである導電性組成物。2. The base material according to claim 1, wherein the base material is resin, rubber,
A conductive composition which is either cement.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP30128490 | 1990-11-06 | ||
JP2-301284 | 1990-11-06 |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0532819A true JPH0532819A (en) | 1993-02-09 |
Family
ID=17894977
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP31834491A Pending JPH0532819A (en) | 1990-11-06 | 1991-11-05 | Conductive composition |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0532819A (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002016282A1 (en) * | 2000-08-21 | 2002-02-28 | Int Chem Co., Ltd | Static-dissipative composition and panel manufactured therewith |
WO2002062899A1 (en) * | 2001-02-05 | 2002-08-15 | Toray Industries, Inc. | Carbon fiber reinforced resin composition, molding material and molded article therefrom |
JP2004500510A (en) * | 1999-12-23 | 2004-01-08 | アライアント・テクシステムズ・インコーポレーテッド | How to insulate the case of a solid propellant rocket motor |
JP2007092074A (en) * | 2006-11-13 | 2007-04-12 | Osaka Gas Co Ltd | Electroconductive polymer |
WO2010038784A1 (en) * | 2008-09-30 | 2010-04-08 | 保土谷化学工業株式会社 | Composite material containing carbon fiber |
JP2011073944A (en) * | 2009-10-01 | 2011-04-14 | Aica Kogyo Co Ltd | Polyurethane-based cement composition and floor layer structure |
-
1991
- 1991-11-05 JP JP31834491A patent/JPH0532819A/en active Pending
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2004500510A (en) * | 1999-12-23 | 2004-01-08 | アライアント・テクシステムズ・インコーポレーテッド | How to insulate the case of a solid propellant rocket motor |
JP4656792B2 (en) * | 1999-12-23 | 2011-03-23 | アライアント・テクシステムズ・インコーポレーテッド | How to insulate the case of a solid propellant rocket motor |
WO2002016282A1 (en) * | 2000-08-21 | 2002-02-28 | Int Chem Co., Ltd | Static-dissipative composition and panel manufactured therewith |
WO2002062899A1 (en) * | 2001-02-05 | 2002-08-15 | Toray Industries, Inc. | Carbon fiber reinforced resin composition, molding material and molded article therefrom |
US6998434B2 (en) | 2001-02-05 | 2006-02-14 | Toray Industries, Inc. | Carbon fiber reinforced resin composition, molding compounds and molded products therefrom |
JP2007092074A (en) * | 2006-11-13 | 2007-04-12 | Osaka Gas Co Ltd | Electroconductive polymer |
WO2010038784A1 (en) * | 2008-09-30 | 2010-04-08 | 保土谷化学工業株式会社 | Composite material containing carbon fiber |
JP2011073944A (en) * | 2009-10-01 | 2011-04-14 | Aica Kogyo Co Ltd | Polyurethane-based cement composition and floor layer structure |
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