JPH02196836A - Pressure-sensitive electrically conductive rubber composition - Google Patents
Pressure-sensitive electrically conductive rubber compositionInfo
- Publication number
- JPH02196836A JPH02196836A JP1496989A JP1496989A JPH02196836A JP H02196836 A JPH02196836 A JP H02196836A JP 1496989 A JP1496989 A JP 1496989A JP 1496989 A JP1496989 A JP 1496989A JP H02196836 A JPH02196836 A JP H02196836A
- Authority
- JP
- Japan
- Prior art keywords
- rubber
- pressure
- rubber composition
- electrically conductive
- 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.)
- Pending
Links
- 229920001971 elastomer Polymers 0.000 title claims abstract description 53
- 239000005060 rubber Substances 0.000 title claims abstract description 53
- 239000000203 mixture Substances 0.000 title claims abstract description 33
- 239000002245 particle Substances 0.000 claims abstract description 21
- 229920002379 silicone rubber Polymers 0.000 claims abstract description 11
- 239000004945 silicone rubber Substances 0.000 claims abstract description 11
- 229920003049 isoprene rubber Polymers 0.000 claims abstract description 6
- 229910021383 artificial graphite Inorganic materials 0.000 abstract description 7
- 230000001747 exhibiting effect Effects 0.000 abstract 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 230000007423 decrease Effects 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 229910002804 graphite Inorganic materials 0.000 description 3
- 239000010439 graphite Substances 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002006 petroleum coke Substances 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- -1 microcarbon Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 239000000615 nonconductor Substances 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000005987 sulfurization reaction Methods 0.000 description 1
- 238000004073 vulcanization Methods 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、非加圧時には高電気抵抗性または高電気絶縁
性を有し、加圧時には低電気抵抗性または導電性を示す
感圧導電性ゴム組成物に関する。Detailed Description of the Invention [Field of Industrial Application] The present invention provides a pressure-sensitive conductive material that has high electrical resistance or high electrical insulation when no pressure is applied, and exhibits low electrical resistance or conductivity when pressurized. The present invention relates to a rubber composition.
従来、導電性粒子として、カーボンブラック、黒鉛粉、
マイクロカーボンなどの炭素質粒子、銀、ニッケル、ス
テンレス粉などの金属粉、銀メツキした銅粉等の導電性
金属粉を配合した感圧導電性ゴム組成物は公知である。Conventionally, carbon black, graphite powder,
Pressure-sensitive conductive rubber compositions containing carbonaceous particles such as microcarbon, metal powders such as silver, nickel, and stainless steel powders, and conductive metal powders such as silver-plated copper powders are known.
この感圧導電性ゴム組成物は、たとえばインターコネク
ター、キーボードスイッチ、自動ドア等に使用されるマ
ッドスイッチ、道路に設置される通過車輌を検知するた
めのリボン状スイッチ、圧力測定用の圧力スイッチ接点
等のいろいろな電気製品に広く使用されている。This pressure-sensitive conductive rubber composition is used, for example, in interconnectors, keyboard switches, mud switches used in automatic doors, ribbon-shaped switches installed on roads to detect passing vehicles, and pressure switch contacts for pressure measurement. It is widely used in various electrical products such as
しかしながら、従来の感圧導電性ゴム組成物は、圧力（
荷重）の増減に比例して出力電圧が増減するものではな
かった。すなわち、荷重と出力電圧とが直線的（リニア
）な関係にないため、高い精度を要求される電気製品に
は利用されることがなかった。たとえば前記荷重−出力
電圧関係が直線的でないものを圧力センサー等に使用す
ると、圧力（荷重）の大きさによって出力が変動するた
め、単独での使用が回能となり、なんらかの電気的補正
または補正用電気回路が必要となり、製品を複雑にし、
価格を高くするという問題があった。However, conventional pressure-sensitive conductive rubber compositions are difficult to apply pressure (
The output voltage did not increase or decrease in proportion to the increase or decrease in the load (load). That is, since there is no linear relationship between the load and the output voltage, it has not been used in electrical products that require high accuracy. For example, if a pressure sensor with a non-linear load-output voltage relationship is used, the output will fluctuate depending on the magnitude of the pressure (load). Requires electrical circuits, complicates the product,
There was a problem with raising the price.
本発明の目的は、荷重−出力電圧関係が直線的であり、
荷重に比例した出力電圧が得られる感圧導電性ゴム組成
物を提供するにある。The object of the present invention is that the load-output voltage relationship is linear,
It is an object of the present invention to provide a pressure-sensitive conductive rubber composition that provides an output voltage proportional to load.
本発明の目的は、ゴム成分として、１０〜９０重量％の
シリコーンゴムと９０〜１０重量％のイソプレンゴム（
以下、ＩＲと略す）とからなるブレンドゴムを使用し、
これにゴム組成物の全容積当たり２５〜５５容量χの導
電性粒子を配合した感圧導電性ゴム組成物により達成す
ることができる。The object of the present invention is to use 10 to 90% by weight of silicone rubber and 90 to 10% by weight of isoprene rubber as rubber components.
Using a blended rubber consisting of (hereinafter abbreviated as IR),
This can be achieved by using a pressure-sensitive conductive rubber composition containing 25 to 55 volumes χ of conductive particles per total volume of the rubber composition.
本発明の感圧導電性ゴム組成物は、ゴム組成物を構成す
るゴム成分としてシリコーンゴムとＩＲとからなるブレ
ンドゴムであり、このブレンドゴムに導電性粒子を配合
することにより、加圧力（荷重）に直線的に比例した出
力電圧を示す感圧導電性ゴム組成物を得たものである。The pressure-sensitive conductive rubber composition of the present invention is a blend rubber consisting of silicone rubber and IR as rubber components constituting the rubber composition, and by blending conductive particles into this blend rubber, the pressure-sensitive conductive rubber composition ) A pressure-sensitive conductive rubber composition is obtained which exhibits an output voltage linearly proportional to .
本発明の感圧導電性ゴム組成物のゴム成分を構成するブ
レンドゴムの中でシリコーンゴムの割合は１０〜９０重
量％であり、他方、ＩＲの割合は９０〜１０重量％であ
ることが必要である。In the blended rubber constituting the rubber component of the pressure-sensitive conductive rubber composition of the present invention, the proportion of silicone rubber is 10 to 90% by weight, while the proportion of IR is 90 to 10% by weight. It is.
すなわち、第１図は、シリコーンゴムとＩＲとの配合割
合を変更した感圧導電性ゴム組成物からそれぞれゴムシ
ートを作製し、これらのゴムシートに加えられる荷重（
ｇ）を変更したときの出力電圧（Ｖ）をプロットしたグ
ラフである。第１図から、感圧導電性ゴム組成物中のシ
リコーンゴムの量が１０重量％未満またはＩＲＯ量が９
０重量％を超えると、得られるゴム組成物は感圧導電性
を示さなくなり、実質的に電気絶縁体となる。他方、シ
リコーンゴムの量が９０重量％超えるかまたはＩＨの量
が１０重量％未満になると、荷重と出力電圧との間の直
線関係が失われ、荷重に比例する出力電圧が得られなく
なる。That is, FIG. 1 shows the load applied to these rubber sheets (
3 is a graph plotting the output voltage (V) when changing g). From FIG. 1, it can be seen that the amount of silicone rubber in the pressure sensitive conductive rubber composition is less than 10% by weight or the IRO amount is 9% by weight.
If it exceeds 0% by weight, the resulting rubber composition will no longer exhibit pressure-sensitive conductivity and will essentially become an electrical insulator. On the other hand, if the amount of silicone rubber exceeds 90% by weight or the amount of IH becomes less than 10% by weight, the linear relationship between load and output voltage is lost, and an output voltage proportional to load cannot be obtained.
このようなゴム組成物に配合される導電性粒子としては
、前述した各種の導電性粒子がある。As the electrically conductive particles to be blended into such a rubber composition, there are the various electrically conductive particles described above.
しかしながら、好ましくは角をおとした丸味のある礫状
の人造黒鉛粒子、特に直径が約４０μｍ〜１６０μｍの
前記人造黒鉛粒子を使用するのがよい、この導電性人造
黒鉛粒子は、たとえば特開昭５３−７９９３７号または
特開昭５４−８０３５０号各公報定記載されているよう
に、石油コークスまたは石油コークスを焼成した炭素塊
をさらに高温で黒鉛化した人造黒鉛を破砕し、乳鉢、低
速度のボールミルまたは高速の回転翼を有する容器中で
、減摩し、これを分級することによって得られる。この
ような人造黒鉛粒子を含有するゴム組成物は、そのゴム
製品が加圧され、応力が加わっても、ゴム中の人造黒鉛
粒子の形状が角のとれた丸味のある礫状であり、応力が
集中する部分や弱点部がないため、破壊変形することが
ない。したがって、導電性粒子として、この角をおとし
た丸味のある礫状の人造黒鉛粒子を配合すると、繰り返
し荷重に対して耐久性のある感圧導電性を有するゴム製
品を得ることができる。However, it is preferable to use artificial graphite particles in the form of pebbles with rounded edges, especially artificial graphite particles having a diameter of about 40 μm to 160 μm. As described in No. 53-79937 or Japanese Patent Application Laid-open No. 54-80350, petroleum coke or a carbon mass obtained by calcining petroleum coke is further graphitized at a high temperature to crush artificial graphite, which is then crushed in a mortar or at a low speed. It is obtained by reducing friction and classifying it in a ball mill or a container with high-speed rotary blades. In a rubber composition containing such artificial graphite particles, even when the rubber product is pressurized and stress is applied, the shape of the artificial graphite particles in the rubber is rounded and gravel-like, and the stress is Since there are no areas where particles are concentrated or weak points, there is no possibility of destruction or deformation. Therefore, when artificial graphite particles in the form of gravel with rounded corners are blended as the conductive particles, a rubber product having pressure-sensitive conductivity that is durable against repeated loads can be obtained.
導電性粒子の配合量は、感圧導電性ゴム組成物の機械的
、電気特性等により相異するが、ゴム組成物の全容積当
たり２５〜５５容量χ、好ましくは２５〜４５χの範囲
量がよい、導電性粒子の配合量がゴム組成物の全容量当
たり２５容ｉｔχ未満では、良好な感圧導電性が得られ
ないし、５５容量χを超えると、ゴム組成物の機械的性
質が低下するため好ましくない。The amount of conductive particles blended varies depending on the mechanical and electrical properties of the pressure-sensitive conductive rubber composition, but the amount ranges from 25 to 55 volume x, preferably from 25 to 45 x per total volume of the rubber composition. If the amount of conductive particles incorporated is less than 25 volume χ per total volume of the rubber composition, good pressure-sensitive conductivity cannot be obtained, and if it exceeds 55 volume χ, the mechanical properties of the rubber composition will deteriorate. Therefore, it is undesirable.
石油コークスを３．０００℃で加熱焼成して黒鉛化し、
これを破砕してほぼ１００メツシユの砕石状の黒鉛粒子
を得た。これを乳鉢で減摩した後分級し、１５０〜２５
０メツシユのものを捕集し、直径が約６０〜１００μｍ
の角の取れた丸味のある礫状黒鉛粒子を得た。Petroleum coke is heated and fired at 3,000℃ to graphitize it,
This was crushed to obtain approximately 100 mesh of crushed graphite particles. After reducing the friction in a mortar, it is classified to a 150 to 25
0 mesh is collected, and the diameter is about 60 to 100 μm.
Gravel graphite particles with rounded edges were obtained.
一方、シリコーンゴムとＩＲとの配合割合を変更した複
数種類のブレンドゴムを作製し、これらのブレンドゴム
１００重量部に当たり前記黒鉛粒子５０重量部並びにそ
の他、硫黄、加硫促進剤などの配合剤を添加し、ゴム組
成物を作製した。On the other hand, multiple types of blended rubbers were prepared in which the mixing ratio of silicone rubber and IR was changed, and 50 parts by weight of the graphite particles and other compounding agents such as sulfur and vulcanization accelerator were added to 100 parts by weight of these blended rubbers. was added to prepare a rubber composition.
これらのゴム組成物全体を減圧、脱泡して金属板に塗布
し、１５０℃の空気浴中で３０秒加熱ゲル化させ、冷却
させた後剥離し、厚さが約０．５ｍｓ＋のゴムシートを
得た。The entire rubber composition was decompressed and defoamed, applied to a metal plate, gelled by heating in an air bath at 150°C for 30 seconds, cooled and then peeled off to form a rubber sheet with a thickness of about 0.5ms+. I got it.
これらのゴムシートを第２図に示すゴムシートＳの出力
電圧を検出するための電気回路により測定した。すなわ
ち、第２図において、電気回路の２つの電極Ｐ、Ｐ’間
に前記ゴムシートＳを挟持し、ゴムシートＳに荷重（ｇ
）を加えて加圧し、その時の出力電圧（Ｖ）を検出した
。These rubber sheets were measured using an electric circuit for detecting the output voltage of the rubber sheet S shown in FIG. That is, in FIG. 2, the rubber sheet S is sandwiched between two electrodes P and P' of an electric circuit, and a load (g) is applied to the rubber sheet S.
) was applied and pressurized, and the output voltage (V) at that time was detected.
その結果、荷重−出力電圧との関係は第１図に示す通り
であった０図から、ブレンドゴム中のシリコーンゴムの
割合が１０〜９０重量％またはＩＲの割合が９０〜１０
重量％の範囲の場合には、荷重の増減に比例して直線的
に出力電圧が増減する感圧導電特性を示すことが判る。As a result, the relationship between load and output voltage was as shown in Fig.
It can be seen that in the range of weight %, pressure-sensitive conductive characteristics are exhibited in which the output voltage increases and decreases linearly in proportion to increases and decreases in load.
以上、説明したように本発明によれば、感圧導電性ゴム
組成物のゴム成分として、１０〜９０重量％のシリコー
ンゴムと９０〜１０重量％のＩＲとを配合したブレンド
ゴムを使用することにより、荷重と出力電圧とが直線的
関係になった電気的に高い信鎖性を有する感圧導電性ゴ
ム組成物を得ることができる。As explained above, according to the present invention, a blended rubber containing 10 to 90% by weight of silicone rubber and 90 to 10% by weight of IR is used as the rubber component of the pressure-sensitive conductive rubber composition. Accordingly, it is possible to obtain a pressure-sensitive conductive rubber composition having high electrical reliability in which the load and the output voltage are in a linear relationship.
第１図は、ブレンドゴム成分のシリコーンゴムとイソプ
レンゴムとの配合量を変更した感圧導電性ゴム組成物の
荷重と出力電圧との関係を示すグラフ、第２図は荷重と
出力電圧との関係を測定するための電気回路図である。
Ｓ・・・ゴムシート、Ｐ、 Ｐ’ ・・・電極。
代理人 弁理士 小 川 信 −Figure 1 is a graph showing the relationship between load and output voltage of pressure-sensitive conductive rubber compositions with different blended amounts of silicone rubber and isoprene rubber, and Figure 2 is a graph showing the relationship between load and output voltage. FIG. 3 is an electrical circuit diagram for measuring relationships. S...Rubber sheet, P, P'...Electrode. Agent Patent Attorney Nobuo Ogawa −
Claims (1)
のイソプレンゴムとからなるブレンドゴムをゴム成分と
して含有し、かつゴム組成物の全容積当たり２５〜５５
容量％の導電性粒子を含有する感圧導電性ゴム組成物。10-90% by weight silicone rubber and 90-10% by weight
of isoprene rubber as a rubber component, and contains 25 to 55% of isoprene rubber per total volume of the rubber composition.
A pressure sensitive conductive rubber composition containing % by volume of conductive particles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1496989A JPH02196836A (en) | 1989-01-26 | 1989-01-26 | Pressure-sensitive electrically conductive rubber composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1496989A JPH02196836A (en) | 1989-01-26 | 1989-01-26 | Pressure-sensitive electrically conductive rubber composition |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02196836A true JPH02196836A (en) | 1990-08-03 |
Family
ID=11875807
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1496989A Pending JPH02196836A (en) | 1989-01-26 | 1989-01-26 | Pressure-sensitive electrically conductive rubber composition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02196836A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024090427A1 (en) | 2022-10-25 | 2024-05-02 | キヤノン株式会社 | Molded body |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5688442A (en) * | 1979-12-21 | 1981-07-17 | Shin Etsu Polymer Co Ltd | Electrically conductive rubber composition |
| JPS61195161A (en) * | 1985-02-26 | 1986-08-29 | Bridgestone Corp | Conductive rubber |
-
1989
- 1989-01-26 JP JP1496989A patent/JPH02196836A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5688442A (en) * | 1979-12-21 | 1981-07-17 | Shin Etsu Polymer Co Ltd | Electrically conductive rubber composition |
| JPS61195161A (en) * | 1985-02-26 | 1986-08-29 | Bridgestone Corp | Conductive rubber |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024090427A1 (en) | 2022-10-25 | 2024-05-02 | キヤノン株式会社 | Molded body |
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