JPH02298529A - Pressure-sensitive conductive rubber material - Google Patents
Pressure-sensitive conductive rubber materialInfo
- Publication number
- JPH02298529A JPH02298529A JP11855489A JP11855489A JPH02298529A JP H02298529 A JPH02298529 A JP H02298529A JP 11855489 A JP11855489 A JP 11855489A JP 11855489 A JP11855489 A JP 11855489A JP H02298529 A JPH02298529 A JP H02298529A
- Authority
- JP
- Japan
- Prior art keywords
- rubber
- pressure
- sensitive conductive
- pts
- conductive rubber
- 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
- 229920001971 elastomer Polymers 0.000 title claims abstract description 44
- 239000005060 rubber Substances 0.000 title claims abstract description 44
- 239000000463 material Substances 0.000 title claims abstract description 35
- 230000002378 acidificating effect Effects 0.000 claims abstract description 8
- 125000000524 functional group Chemical group 0.000 claims abstract description 8
- 229920003051 synthetic elastomer Polymers 0.000 claims abstract description 8
- 239000005061 synthetic rubber Substances 0.000 claims abstract description 8
- 244000043261 Hevea brasiliensis Species 0.000 claims abstract description 7
- 229920003052 natural elastomer Polymers 0.000 claims abstract description 7
- 229920001194 natural rubber Polymers 0.000 claims abstract description 7
- 239000002134 carbon nanofiber Substances 0.000 claims description 13
- 229910052799 carbon Inorganic materials 0.000 abstract description 8
- 239000000835 fiber Substances 0.000 abstract description 7
- 239000007789 gas Substances 0.000 abstract description 5
- 229920000049 Carbon (fiber) Polymers 0.000 abstract description 4
- 239000004917 carbon fiber Substances 0.000 abstract description 4
- 238000010438 heat treatment Methods 0.000 abstract description 4
- 230000001590 oxidative effect Effects 0.000 abstract description 4
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 abstract description 2
- 239000011261 inert gas Substances 0.000 abstract description 2
- 229910017604 nitric acid Inorganic materials 0.000 abstract description 2
- 239000007800 oxidant agent Substances 0.000 abstract description 2
- 239000003963 antioxidant agent Substances 0.000 abstract 1
- 238000013329 compounding Methods 0.000 abstract 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 9
- 239000003795 chemical substances by application Substances 0.000 description 9
- 239000002184 metal Substances 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 239000000203 mixture Substances 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 239000011159 matrix material Substances 0.000 description 4
- 239000002923 metal particle Substances 0.000 description 4
- 230000003014 reinforcing effect Effects 0.000 description 4
- 238000002156 mixing Methods 0.000 description 3
- -1 titanate compound Chemical class 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 239000013013 elastic material Substances 0.000 description 2
- 239000002657 fibrous material Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000012808 vapor phase Substances 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229920000181 Ethylene propylene rubber Polymers 0.000 description 1
- 229920000459 Nitrile rubber Polymers 0.000 description 1
- 239000005062 Polybutadiene Substances 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 229920006311 Urethane elastomer Polymers 0.000 description 1
- 229920000800 acrylic rubber Polymers 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000003712 anti-aging effect Effects 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 229910021383 artificial graphite Inorganic materials 0.000 description 1
- 229920005549 butyl rubber Polymers 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 210000003850 cellular structure Anatomy 0.000 description 1
- 229920006235 chlorinated polyethylene elastomer Polymers 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 229920001973 fluoroelastomer Polymers 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000005087 graphitization Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229920003049 isoprene rubber Polymers 0.000 description 1
- 239000006249 magnetic particle Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 229920001084 poly(chloroprene) Polymers 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 229920002857 polybutadiene Polymers 0.000 description 1
- 239000005077 polysulfide Substances 0.000 description 1
- 229920001021 polysulfide Polymers 0.000 description 1
- 150000008117 polysulfides Polymers 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
- 238000012916 structural analysis Methods 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 150000003464 sulfur compounds Chemical class 0.000 description 1
- 229920002725 thermoplastic elastomer Polymers 0.000 description 1
Landscapes
- Compositions Of Macromolecular Compounds (AREA)
- Conductive Materials (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、感圧導電性ゴム材に係り、さらに詳しくは酸
性官能基を３〜５００μｅｑ／ｇ有する気相成長法炭素
繊維の黒鉛化物（以下、ＶＣＣＦ−ＡＣと略称する）を
ゴムに配合してなるゴム制であって、非加圧時から加圧
時の電気抵抗値を大きく低下させ、且つ耐クリープ性を
有し、長期間にわたって使用できる感圧導電性ゴム材に
関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a pressure-sensitive conductive rubber material, and more specifically, a graphitized material of vapor grown carbon fiber having 3 to 500 μeq/g of acidic functional groups ( This is a rubber system made by blending VCCF-AC (hereinafter abbreviated as VCCF-AC) into rubber, which greatly reduces the electrical resistance value from the non-pressurized state to the pressurized state, has creep resistance, and can last for a long period of time. This invention relates to a pressure-sensitive conductive rubber material that can be used.
従来、ゴム弾性体に導電性の優れた金属粒子、カーボン
ブラック等を配合し加圧時の変化により抵抗値を変化さ
せる感圧導電性ゴム、また導電性磁性粒子を絶縁性高分
子弾性体に分散させた後、架橋する前か架橋中に一定方
向に磁界を加えながら成形して、金属粒子を磁界に沿っ
て一定方向に配列させる感圧導電性ゴム（例えば特開昭
５８−１５２０３３号公報等）が知られている。また、
導電性の感度を向上させるためにゴムシートの表面に細
胞構造の空隙部を形成し、金属粉末等の導電材料を高充
填に配合したゴムシートが、例えば特開昭５８−２０９
８１０号公報に開示されている。また、ゴムシートの厚
み方向に金属繊維を充填したものが例えば特開昭５８−
２２０３０７号公報に開示され、更に無機質ウィスカー
、カーボンブランク、金属粒子等をゴムに配合する感圧
導電ゴム材が特開昭６１−２４９３０４号公報に提案さ
れている。Conventionally, we have developed pressure-sensitive conductive rubber, which is a rubber elastic material mixed with highly conductive metal particles, carbon black, etc., which changes its resistance value depending on changes in pressure, and conductive magnetic particles made into an insulating polymeric elastic material. After being dispersed, a pressure-sensitive conductive rubber is molded while applying a magnetic field in a certain direction before or during crosslinking to arrange metal particles in a certain direction along the magnetic field (e.g., JP-A-58-152033). etc.) are known. Also,
In order to improve the conductivity sensitivity, a rubber sheet in which cellular structure voids are formed on the surface of the rubber sheet and a conductive material such as metal powder is highly loaded is disclosed in, for example, Japanese Patent Laid-Open No. 58-209.
It is disclosed in Japanese Patent No. 810. In addition, a rubber sheet filled with metal fibers in the thickness direction is, for example, JP-A-58-
JP-A-61-249304 discloses a pressure-sensitive conductive rubber material in which inorganic whiskers, carbon blanks, metal particles, etc. are blended with rubber.
感圧導電性ゴム材としては、金属の粉末や銀メッキした
銅粉などを導電粒子として用いたものもあるが、このよ
うな感圧導電性ゴム材は金属の酸化や、ゴムの劣化が生
じ易く問題があった。そこで各種添加剤を加えることに
よって酸化防止、劣化防止が図られているが、機械的性
質、耐久性等にまだ問題があった。Some pressure-sensitive conductive rubber materials use metal powder or silver-plated copper powder as conductive particles, but such pressure-sensitive conductive rubber materials are susceptible to oxidation of the metal and deterioration of the rubber. There was easily a problem. Therefore, attempts have been made to prevent oxidation and deterioration by adding various additives, but there are still problems with mechanical properties, durability, etc.
また、炭素系のカーボンブランク、黒鉛粉、マイクロカ
ーボンなどを導電粒子とした感圧導電性ゴム組成物にあ
っては、導電性粒子がゴム補強性に欠けもろいため耐久
性が悪いという欠点があった。このように感圧導電性ゴ
ム材は、くり返し使用による電気伝導性の安定性、およ
び耐久性に問題があるため、従来からその改良が図られ
てきた。In addition, pressure-sensitive conductive rubber compositions containing conductive particles such as carbon-based carbon blanks, graphite powder, and microcarbons have the disadvantage of poor durability because the conductive particles lack rubber reinforcing properties and are brittle. Ta. As described above, since pressure-sensitive conductive rubber materials have problems in electrical conductivity stability and durability due to repeated use, improvements have been made in the past.
例えば特開昭５４−８０３５０号公報で開示された感圧
導電性ゴム材にあっては、人造黒鉛粒子の丸み度をコン
トロールすることにより耐久性を向上させている。また
、特開昭５３−４３７４９号公報に開示された感圧導電
性ゴム材にあっては、金属製の導電粒子にジアルキルチ
タネート化合物等を添加することによりくり返し使用に
よる電気特性の変化を押えている。しかしながら、これ
らの感圧導電性ゴム材にあっても、実用上充分な耐１
微性を達成できていなくこれらの欠点を有
しない感圧導電性ゴム材が求められている。For example, in the pressure-sensitive conductive rubber material disclosed in JP-A-54-80350, durability is improved by controlling the roundness of the artificial graphite particles. In addition, in the pressure-sensitive conductive rubber material disclosed in JP-A-53-43749, changes in electrical properties due to repeated use are suppressed by adding a dialkyl titanate compound or the like to metal conductive particles. There is. However, even these pressure-sensitive conductive rubber materials have a practically sufficient resistance to 1.
There is a need for a pressure-sensitive conductive rubber material that does not have these drawbacks.
本発明の目的は、優れた感圧導電性特性を有し、且つく
り返し使用による電気特性の変化の少ない耐久性に優れ
た感圧導電性ゴム材を提供することにある。An object of the present invention is to provide a pressure-sensitive conductive rubber material that has excellent pressure-sensitive conductive properties and excellent durability with little change in electrical properties due to repeated use.
本発明者らは、上記した従来技術の欠点を解決するため
鋭意研究の結果、天然ゴムおよび／または合成ゴムとＶ
ＣＣＦ−ＡＧからなる組成物が感圧導電性ゴム材として
優れていることを見出し、本発明に到達した。As a result of intensive research to solve the above-mentioned drawbacks of the prior art, the present inventors have discovered that natural rubber and/or synthetic rubber and V.
It was discovered that a composition made of CCF-AG is excellent as a pressure-sensitive conductive rubber material, and the present invention was achieved.
すなわち本発明は、電気絶縁性を有する天然ゴムおよび
／または合成ゴム１００重量部に対して、ＶＧＣＦ−Ａ
Ｃを５〜７５重量部配合してなる感圧導電性ゴム材であ
る。That is, in the present invention, VGCF-A is added to 100 parts by weight of natural rubber and/or synthetic rubber having electrical insulation properties.
This is a pressure-sensitive conductive rubber material containing 5 to 75 parts by weight of C.
本発明において用いられるマトリックスは、天然ゴムお
よび／または合成ゴムである。合成ゴムとしては、例え
ばスチレン−ブタジェンゴム、ブタジェンゴム、イソプ
レンゴム、ニトリルゴム、クロロプレンゴム、ブチルゴ
ム、エチレン−プロピレンゴム、アクリルゴム、塩素化
ポリエチレンゴム、フッ素ゴム、シリコーンゴム、ウレ
タンゴム、多硫化ゴム等があげられる。さらに熱可塑性
エラストマーも使用可能であり７、またこれらのゴムを
混合して使用することも可能である。The matrix used in the present invention is natural rubber and/or synthetic rubber. Examples of synthetic rubber include styrene-butadiene rubber, butadiene rubber, isoprene rubber, nitrile rubber, chloroprene rubber, butyl rubber, ethylene-propylene rubber, acrylic rubber, chlorinated polyethylene rubber, fluororubber, silicone rubber, urethane rubber, polysulfide rubber, etc. can give. Furthermore, thermoplastic elastomers can also be used7, and it is also possible to use a mixture of these rubbers.
上、記ゴムは機械的強度及び耐熱性を向上させるために
公知の硫黄、硫黄化合物又は過酸化物等で架橋されても
よく、また老化防止剤等が添加されていてもよい。The above-mentioned rubber may be crosslinked with known sulfur, sulfur compounds, peroxides, etc. in order to improve mechanical strength and heat resistance, and anti-aging agents and the like may be added.
本発明において、気相成長法炭素繊維の黒鉛化物とは、
炭化水素などあ炭素源を触媒存在下に加熱し気相成長さ
せて作られる繊維状の炭素質物質すなわち気相成長法炭
素繊維に、黒鉛化熱処理をびこれを粉砕したり切断した
りした種々の形態め黒鉛質物質であり、本発明の気相成
長法炭素繊維の黒鉛化物は、その繊維を電子顕微鏡で観
察すると、芯の部分と、これを取巻く、−見して、年輪
状の炭素層からなる特異な形状を有しており、本発明の
気相成長法炭素繊維の黒鉛化物は、この様な繊維状物及
びこれが粉砕、破砕、切断などの加工を受けたものであ
る。In the present invention, the graphitized material of vapor grown carbon fiber is
Fibrous carbonaceous materials made by heating a carbon source such as a hydrocarbon in the presence of a catalyst and growing it in a vapor phase, that is, vapor-phase grown carbon fiber, are subjected to graphitization heat treatment and then crushed or cut into various types. When the graphitized material of the vapor-grown carbon fiber of the present invention is observed under an electron microscope, it shows a core part and surrounding carbon fibers in the form of growth rings. It has a unique shape consisting of layers, and the graphitized material of vapor-grown carbon fiber of the present invention is such a fibrous material and its processed material such as crushing, crushing, and cutting.
本発明において、気相成長法炭素繊維の黒鉛化物は、直
径が０．０１〜５μｍ１好ましくは０．０１〜２μｍ、
更に好ましくは、０．０１〜１μｍ、最も□好ましくは
０．０１〜０．５μｍであり、繊維の長さは特に制限は
ない。一般には５０００μｍ以下であるが、更に短くて
も良く１０００μｍや１００μｍ、あるいは１．０μｍ
でも良く、又、これを更に短く破砕や切断あるいは粉砕
した繊維状物、あるいは、粒状や不定形状の物も使用で
きる。In the present invention, the graphitized material of vapor grown carbon fiber has a diameter of 0.01 to 5 μm, preferably 0.01 to 2 μm,
More preferably, it is 0.01 to 1 μm, most preferably 0.01 to 0.5 μm, and the length of the fiber is not particularly limited. Generally it is 5000μm or less, but it may be shorter than 1000μm, 100μm, or 1.0μm.
Alternatively, fibrous materials obtained by crushing, cutting, or pulverizing these into shorter lengths, or granular or irregularly shaped materials can also be used.
本発明において気相成長法炭素ｍｓの黒鉛化物は、炭素
の純度が高く、一般に９８．５％以上、特に９９％以上
、最も好ましくは９９．・５％以上である。In the present invention, the graphitized product of vapor-grown carbon ms has high carbon purity, generally 98.5% or more, particularly 99% or more, most preferably 99.5% or more.・It is 5% or more.
また、本発明において気相成長法炭素繊維の黒鉛化物は
黒鉛性の高い物質であり、更に、その中でもｘ１回折に
よる構造解析において、その黒鉛の結晶構造における格
子定数ＣＯが６．８８以下の範＝６−
囲のものであり、好ましくは６．８６以下、特に好まし
くは６．８０〜６．７０の範囲、最も好ましくは６．７
８〜６．７２の範囲のものである。Furthermore, in the present invention, the graphitized material of the vapor grown carbon fiber is a highly graphitic material, and furthermore, in the structural analysis by x1 diffraction, the lattice constant CO in the crystal structure of graphite is in the range of 6.88 or less. =6-, preferably 6.86 or less, particularly preferably in the range of 6.80 to 6.70, most preferably 6.7
It is in the range of 8 to 6.72.
本発明において、気相成長法炭素繊維の黒鉛化物は気相
成長法炭素繊維を不活性ガス雰囲気下で高温度において
熱処理する事により得られるが、熱処理温度としては１
５００°Ｃ以上、好ましくは１７００°Ｃ以上、特に２
０００°Ｃ以上であり、最も好ましい範囲は２１００〜
３０００℃の範囲である。In the present invention, the graphitized material of vapor-grown carbon fiber is obtained by heat-treating the vapor-grown carbon fiber at high temperature in an inert gas atmosphere.
500°C or higher, preferably 1700°C or higher, especially 2
000°C or higher, and the most preferable range is 2100~
The temperature range is 3000°C.
本発明においてＶＣＣＩ−ＡＧとは、気相成長法炭素繊
維の黒鉛化物に酸性官能基を３〜５００μｅｑ／ｇ付加
したものである。更に好ましくは、酸性官能基の付加量
は８〜４５０μｅｑ／ｇ、特に１５〜３５０μｅｑ／ｇ
の範囲である。In the present invention, VCCI-AG is a graphitized product of vapor grown carbon fiber to which 3 to 500 μeq/g of acidic functional groups are added. More preferably, the amount of acidic functional group added is 8 to 450 μeq/g, particularly 15 to 350 μeq/g.
is within the range of
本発明のＶＣＣＦ−ＡＣの製造方法としては、気相成長
法炭素繊維黒鉛化物を酸素などの酸化性ガスや硝酸など
の酸化剤などで酸化する方法が最も一般的であり、酸化
する方法の代わりにその他プラズマ法、グラフト法等も
用いられ得る。The most common method for producing the VCCF-AC of the present invention is to oxidize vapor-grown carbon fiber graphitized material with an oxidizing gas such as oxygen or an oxidizing agent such as nitric acid, which is an alternative to the oxidizing method. In addition, plasma methods, graft methods, etc. may also be used.
本発明における感圧導電性ゴム材は、上記のＶＣＣＦ−
ＡＣを含有するゴム材であり、該組成物中のＶＧＣＦ−
ＡＣの含有量は、マトリックス１００重量部に対して５
〜７５重量部であり、好ましくは１０〜６０重量部、よ
り好ましくは１０〜５０重量部であり、特に好ましくは
１５〜４５重量部である。The pressure-sensitive conductive rubber material in the present invention is the above-mentioned VCCF-
It is a rubber material containing AC, and VGCF-
The content of AC is 5 parts by weight per 100 parts by weight of the matrix.
-75 parts by weight, preferably 10-60 parts by weight, more preferably 10-50 parts by weight, particularly preferably 15-45 parts by weight.
本発明の感圧導電性ゴム材は、ＶＧＣＦ−ＡＧの特徴に
より充分なゴム補強効果と感圧導電性が達成される。す
なわち、上記ゴムマトリックスにＶＣＣＦ−ＡＧを配合
した場合、ＶＧＣＩ−ＡＣが針状繊維体であるため非常
に剛直な性質と導電性を有しており、その一部がゴムマ
トリックスの表面の種々の方向、角度をもって露出して
いるので、非加圧時から加圧時へ移るときＶＣＣＦ−Ａ
Ｇが点接触から面接触へ徐々に移行して抵抗値を低下さ
せる。また、ＶＣＣＦ−ＡＣの配合量を変えることＱこ
より目的に応じた抵抗値を有する感圧導電性ゴム材を得
ることが可能である。The pressure-sensitive conductive rubber material of the present invention achieves sufficient rubber reinforcing effect and pressure-sensitive conductivity due to the characteristics of VGCF-AG. In other words, when VCCF-AG is blended into the rubber matrix, since VGCI-AC is a needle-like fiber body, it has very rigid properties and conductivity, and a part of it has various properties on the surface of the rubber matrix. VCCF-A is exposed in certain directions and angles, so when moving from non-pressurized to pressurized
G gradually shifts from point contact to surface contact, lowering the resistance value. Further, by changing the blending amount of VCCF-AC, it is possible to obtain a pressure-sensitive conductive rubber material having a resistance value depending on the purpose.
つぎに、天然ゴムおよび／または合成ゴムとＶＣＣＦ−
ＡＣとを配合する方法としては特に制限はなく、例えば
ヘンシエルミギサー、ニーダ−、バンバリーミキサ−、
レゾイエミキサー、ロール等の公知の手段、方法によっ
て配合され加圧することができる。これらの方法で得ら
れた感圧導電性ゴム材は、加圧をくり返し行なっても抵
抗値の変動の少ない特性を有し、更に、この組成物はＶ
ＧＣＦ−ＡＧの添加量によって抵抗値を変化させられる
特性も有している。Next, natural rubber and/or synthetic rubber and VCCF-
There are no particular restrictions on the method of blending with AC, such as Henschel Migisser, kneader, Banbury mixer,
It can be blended and pressurized by known means and methods such as a Rezoyer mixer and a roll. The pressure-sensitive conductive rubber material obtained by these methods has the property that its resistance value does not change much even when pressurized repeatedly, and furthermore, this composition has
It also has the characteristic that the resistance value can be changed depending on the amount of GCF-AG added.
これらの特性について以下実施例および比較例により詳
細に説明する。These characteristics will be explained in detail below using Examples and Comparative Examples.
実施例１〜３および比較例１〜３
直径が０．０５〜０．１μｍの気相成長法炭素繊維（ト
リスアセチルアセ１−ナート鉄とヘンゼンを１４００℃
の加熱空間に導入し浮遊状態で合成した）を、２４００
°Ｃアルゴン気流下で熱処理を行ない、炭素含有量９９
％、格子定数６．７５の黒鉛化物を得た。この黒鉛化物
を酸素０．７％含有Ｎ２ガスで酸化し、酸性官能基の量
が１３６μｅｑ／ｇの気相成長法炭素繊維の黒鉛化物を
得た。これを若干破砕し、分散操作がしやすい、且つ電
子顕微鏡で観察したときの繊維長が実質的に５．０μｍ
以上の酸性官能基をもつＶＧＣＦ−ＡＣを得た。Examples 1 to 3 and Comparative Examples 1 to 3 Vapor grown carbon fibers with a diameter of 0.05 to 0.1 μm (trisacetylacetylacetate iron and Hensen at 1400°C
) was synthesized in a floating state by introducing it into the heating space of
Heat treated under argon flow at °C, carbon content 99
% and a lattice constant of 6.75 was obtained. This graphitized product was oxidized with N2 gas containing 0.7% oxygen to obtain a graphitized vapor grown carbon fiber having an amount of acidic functional groups of 136 μeq/g. By slightly crushing this, it is easy to disperse, and the fiber length when observed with an electron microscope is essentially 5.0 μm.
VGCF-AC having the above acidic functional group was obtained.
第−表に示す配合に基づき、ゴム配合物をバンバリーミ
キサ−で混練後、ロールを用いて厚み２ｍｍのシートを
作成し、常法により成形硬化したシートを２ｃｍＸ２ｃ
ｍの寸法にサンプルを切り取り、両面に電極を取りつけ
、非加圧時及び加圧時の体積固有抵抗値（Ω・ｃｍ）を
測定した。その結果は第二表に示されるとおり良好な感
圧導電特性を有し、ＶＣＣＦ−ＡＧの添加量をえらぶこ
とで目的に応じて使用出来る。Based on the formulation shown in Table 1, the rubber compound was kneaded in a Banbury mixer, then a sheet with a thickness of 2 mm was created using a roll, and the sheet was molded and cured by a conventional method to a size of 2 cm x 2 cm.
A sample was cut to a size of m, electrodes were attached to both sides, and the volume resistivity (Ω·cm) was measured when no pressure was applied and when pressure was applied. As shown in Table 2, the results show that it has good pressure-sensitive conductive properties, and can be used depending on the purpose by selecting the amount of VCCF-AG added.
次にこのシートを以下の方法で試験してその耐久性の評
価を行った。Next, this sheet was tested in the following manner to evaluate its durability.
まずシートを上下から電極ではさみ５００ ｇ／ｃｍ２
の力でくり返し加圧し一定回数ごとに加圧力と抵抗の関
係を調べこれをグラフに描いた。しばらくは同じ形を描
くが回数を増加していくとグラフは形が変化していき、
そしである回数以上になると急に形が変化する。そのと
きの回数をシートの耐久性と判定した。First, the sheet is sandwiched between electrodes from above and below at 500 g/cm2.
Pressure was applied repeatedly with a force of , and the relationship between the applied force and resistance was examined at regular intervals and drawn in a graph. The same shape is drawn for a while, but as the number of times is increased, the shape of the graph changes,
When the number of times exceeds a certain number, the shape suddenly changes. The number of times at that time was determined as the durability of the sheet.
その結果は第三表に示すとおり、ＶＧＣＦ−ＡＧによる
補強効果が見られ、本発明の感圧導電性ゴム材は感圧導
電特性及び耐久性において優れている。As shown in Table 3, the results show that VGCF-AG has a reinforcing effect, and the pressure-sensitive conductive rubber material of the present invention is excellent in pressure-sensitive conductive properties and durability.
（以下余白）
、１
１ｌ−
−ｔ３− −−−第三表 （
耐久性）
〔発明の効果〕
以上詳述したように、本発明の感圧導電性ゴム材は、優
れた感圧導電特性を有し、しかもくり返し使用における
耐久性にも優れたものである。さらにＶＧＣＦ−ＡＧの
特徴でもあるゴム補強効果も有する。(Margins below), 1 1l- -t3- ---Table 3 (
Durability) [Effects of the Invention] As detailed above, the pressure-sensitive conductive rubber material of the present invention has excellent pressure-sensitive conductive properties and is also excellent in durability in repeated use. Furthermore, it also has a rubber reinforcing effect, which is a characteristic of VGCF-AG.
また本発明の感圧導電性ゴム材は、優れた導電性能を有
するので、金属粒子、金属繊維等との併用の必要もなく
、簡便に製造できる利点も有する。In addition, since the pressure-sensitive conductive rubber material of the present invention has excellent conductive performance, it does not need to be used in combination with metal particles, metal fibers, etc., and has the advantage that it can be easily manufactured.
Claims (1)
、酸性官能基を３〜５００μｅｑ／ｇ有する気相成長法
炭素繊維の黒鉛化物を５〜７５重量部配合してなる感圧
導電性ゴム材。A pressure-sensitive conductive rubber material comprising 5 to 75 parts by weight of graphitized vapor grown carbon fiber having 3 to 500 μeq/g of acidic functional groups to 100 parts by weight of natural rubber and/or synthetic rubber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11855489A JPH02298529A (en) | 1989-05-15 | 1989-05-15 | Pressure-sensitive conductive rubber material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11855489A JPH02298529A (en) | 1989-05-15 | 1989-05-15 | Pressure-sensitive conductive rubber material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02298529A true JPH02298529A (en) | 1990-12-10 |
Family
ID=14739463
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11855489A Pending JPH02298529A (en) | 1989-05-15 | 1989-05-15 | Pressure-sensitive conductive rubber material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02298529A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0644233A1 (en) * | 1993-08-12 | 1995-03-22 | The Goodyear Tire & Rubber Company | Graphite fiber reinforced tires & method of incorporating graphite fibers into an elastomer |
| JP2008143963A (en) * | 2006-12-07 | 2008-06-26 | Nissin Kogyo Co Ltd | Carbon fiber composite material |
-
1989
- 1989-05-15 JP JP11855489A patent/JPH02298529A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0644233A1 (en) * | 1993-08-12 | 1995-03-22 | The Goodyear Tire & Rubber Company | Graphite fiber reinforced tires & method of incorporating graphite fibers into an elastomer |
| JP2008143963A (en) * | 2006-12-07 | 2008-06-26 | Nissin Kogyo Co Ltd | Carbon fiber composite material |
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