JPH0371052A - Detecting sensor - Google Patents
Detecting sensorInfo
- Publication number
- JPH0371052A JPH0371052A JP20742189A JP20742189A JPH0371052A JP H0371052 A JPH0371052 A JP H0371052A JP 20742189 A JP20742189 A JP 20742189A JP 20742189 A JP20742189 A JP 20742189A JP H0371052 A JPH0371052 A JP H0371052A
- Authority
- JP
- Japan
- Prior art keywords
- sensing part
- thermally expandable
- tetrafluoroethylene resin
- sheet
- polymer material
- 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
- 239000011347 resin Substances 0.000 claims abstract description 16
- 229920005989 resin Polymers 0.000 claims abstract description 16
- 239000002861 polymer material Substances 0.000 claims abstract description 14
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000003575 carbonaceous material Substances 0.000 claims abstract description 10
- 239000004020 conductor Substances 0.000 claims abstract description 10
- 238000001514 detection method Methods 0.000 claims description 12
- 229920000642 polymer Polymers 0.000 abstract description 6
- 229920001971 elastomer Polymers 0.000 abstract description 3
- 239000000806 elastomer Substances 0.000 abstract description 3
- -1 for example Substances 0.000 abstract description 3
- 239000012530 fluid Substances 0.000 abstract description 2
- 230000002787 reinforcement Effects 0.000 abstract 1
- 239000002904 solvent Substances 0.000 abstract 1
- 239000002245 particle Substances 0.000 description 4
- 239000006229 carbon black Substances 0.000 description 3
- 230000008602 contraction Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000011342 resin composition Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 239000010687 lubricating oil Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 239000012254 powdered material Substances 0.000 description 2
- WSLDOOZREJYCGB-UHFFFAOYSA-N 1,2-Dichloroethane Chemical compound ClCCCl WSLDOOZREJYCGB-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
- 239000004810 polytetrafluoroethylene Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 229920005573 silicon-containing polymer Polymers 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Investigating Or Analyzing Materials By The Use Of Fluid Adsorption Or Reactions (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
- Examining Or Testing Airtightness (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、重油やガス等の検知が可能で、安定性に優
れた検知センサに関４−る。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a detection sensor that is capable of detecting heavy oil, gas, etc. and has excellent stability.
従来のこの種のセンサとしては、例えばカーボンブラッ
ク、グラファイト等の導電性炭素物質を含有する未焼成
の四フッ化エチレン樹脂シーＩ・を用い、このシートに
よって二本の導体を離間支持してなるものがあり、前記
シートの内部に分散している導電性炭素物質粒子間にＡ
Ｉ＋が侵入すると、トンネル効果によるンートの導電性
が低下し、これを導体間の電気抵抗値の変化として捉え
ることにより、漏油を検知するような構成になっている
。Conventional sensors of this type use an unfired tetrafluoroethylene resin sheet I containing conductive carbon materials such as carbon black and graphite, and support two conductors apart from each other with this sheet. There is A between the conductive carbon material particles dispersed inside the sheet.
When I+ enters, the conductivity of the channel decreases due to the tunnel effect, and oil leakage is detected by capturing this as a change in the electrical resistance between the conductors.
（特公昭５９−４．７２５６号参照）。(See Special Publication No. 59-4.7256).
上記センサの感知部は、未焼成の四フソ化エチレン樹脂
で形成され、圧延等の成形加工時に受（また歪が残留し
ているので、温度上昇に対して収縮する傾向がみられる
。そして、感知部である導電性シー）・が収縮すると、
その体積抵抗率が変化する。このため、本来のη１■検
知時における電気抵抗値の変化と、周囲の温度変化に起
因する電気抵抗値の変化とを誤認し、誤報を発づ゛るお
それがあった。The sensing part of the sensor is made of unfired tetrafluoroethylene resin, which is subjected to stress during forming processes such as rolling (and has a residual strain, so it tends to shrink when the temperature rises. When the conductive sheet (sensing part) contracts,
Its volume resistivity changes. For this reason, there is a possibility that a change in the electric resistance value during the original detection of η1■ may be mistakenly recognized as a change in the electric resistance value due to a change in the ambient temperature, and a false alarm may be issued.
この発明は、このような従来技術の課題に鑑みなされた
ものであって、周囲の温度変化に対して影響を受けにく
い安定性の向」−シた検知センサの提供をその目的とす
る。The present invention has been made in view of the problems of the prior art, and an object of the present invention is to provide a detection sensor that is less susceptible to changes in ambient temperature and has improved stability.
そこで、本発明者らはこのような従来技術の課題を解決
するために鋭意検討を重ねた結果、ある種のポリマーを
感知部に混入した時、センサの安定性が高まることを見
い出し本発明に到達した。Therefore, the present inventors conducted extensive studies to solve the problems of the conventional technology, and as a result, they discovered that the stability of the sensor increases when a certain type of polymer is mixed into the sensing part. Reached.
即ち、本発明は、少なくとも一対の導体と、この導体を
相互に離間させて保持する導電性炭素物質が分散した未
焼成四フッ化エチレン樹脂からなる感知部と、この感知
部の外側に設けられる透過性外被を備える検知センサに
おいて、前記感知部に未焼成四フッ化エチレン樹脂の収
縮を匝止する熱膨張性高分子材料を混入したことを特徴
としている。That is, the present invention provides at least one pair of conductors, a sensing section made of an unfired tetrafluoroethylene resin in which a conductive carbon material is dispersed to hold the conductors apart from each other, and a sensing section provided outside the sensing section. The detection sensor includes a transparent jacket, and is characterized in that the sensing portion contains a thermally expandable polymer material that prevents contraction of the green tetrafluoroethylene resin.
熱膨張性高分子材料としては、特に限定はされないが、
例えばエラストマーあるいはゴム変性ポリマーなどが好
適に用いられる。これら熱膨張性高分子材料を感知部に
混入するには、例えば有機溶剤に溶解させたものを感知
部に含浸させた後、乾燥硬化させるか、粉末状のものを
導電性炭素物質と共に四フッ化エチレン樹脂に混ぜるよ
うにしてもよい。Although there are no particular limitations on the thermally expandable polymer material,
For example, elastomers or rubber-modified polymers are preferably used. In order to mix these thermally expandable polymer materials into the sensing part, for example, the sensing part is impregnated with a solution dissolved in an organic solvent and then dried and hardened, or a powdered material is mixed with a conductive carbon material into a four-fluoride material. It may also be mixed with ethylene chloride resin.
この種のセンサにおいて、感知部は、カーボンブラック
等の導電性を有する炭素物質粒子を四フッ化エチレン樹
脂に分散した組成物からなり、この導電性粒子が連鎖構
造を形成するか、あるいは数オングストローム以内の距
離に接近することにより、導電性が付与されている。そ
して従来のセンサでは、検知時に感知部への油の浸透が
不可欠であるから、上記樹脂組成物は多数の気孔が残る
ように未焼成の状態で使用される。この未焼成の樹脂組
成物は、成形加工時に受けた歪が除失されずにそのまま
残っているので、温められると収縮する性質がある。こ
のため、設置場所の温度が変化したときに、感知部の体
積抵抗率も変化してしまうので、センサの安定性の面で
は好ましくない。In this type of sensor, the sensing part is made of a composition in which conductive carbon material particles such as carbon black are dispersed in tetrafluoroethylene resin, and the conductive particles form a chain structure or have a diameter of several angstroms. Conductivity is imparted by approaching within a distance of In conventional sensors, it is essential for oil to penetrate into the sensing portion during detection, so the resin composition is used in an unfired state so that a large number of pores remain. This unfired resin composition has the property of shrinking when heated because the strain received during the molding process remains without being removed. For this reason, when the temperature of the installation location changes, the volume resistivity of the sensing portion also changes, which is unfavorable from the standpoint of sensor stability.
そこで、この発明では、熱膨張性高分子材料を感知部に
混入する。これにより、温度上昇時における未焼成四フ
ッ化樹脂の収縮は、熱膨張性高分子材料の膨張によって
相殺され、感知部全体としての体積変化はほとんど起こ
らない。したがって、その中に分散された導電性炭素物
質の粒子あるいは繊維の分散状態が変化しないので、感
知部の体積抵抗率は、温度が変動しても常に一定に保た
れる。Therefore, in the present invention, a thermally expandable polymer material is mixed into the sensing portion. As a result, the contraction of the unfired tetrafluoride resin when the temperature rises is offset by the expansion of the thermally expandable polymer material, and the volume of the sensing section as a whole hardly changes. Therefore, since the dispersion state of the particles or fibers of the conductive carbon material dispersed therein does not change, the volume resistivity of the sensing part is always kept constant even if the temperature changes.
第１図は、この発明の一実施例による検知センサの一部
を切り欠いた斜視図である。図示の検知センサｌは、シ
ート状に形成された導電性の未焼成四フッ化エチレン樹
脂組成物からなる感知部２部２に沿って二本の補強用金
属線５．５を離間させて配置し、そしてこれらを、検知
すべき流体を選択的に透過させることのできる外被とし
ての二枚の多孔質高分子材料からなるシート６，６で挟
持一体化した構成となっている。FIG. 1 is a partially cutaway perspective view of a detection sensor according to an embodiment of the present invention. The illustrated detection sensor 1 has two reinforcing metal wires 5.5 spaced apart along a sensing portion 2 made of a conductive unfired polytetrafluoroethylene resin composition formed in a sheet shape. These are sandwiched and integrated between two sheets 6, 6 made of a porous polymeric material as an outer cover that can selectively transmit the fluid to be detected.
ここで、感知部２は、四フッ化エチレン樹脂粉末にカー
ボンブラック１０〜５０重量％加え、その混和物に液状
潤滑剤を添加して押出し圧延したシートを、幅方向もし
くは長手方向、あるいは両方向に１２〜１．４倍程度延
伸したもので、この延伸によってシートは連続気孔性の
多孔質構造になる。Here, the sensing part 2 is configured to extrude and roll a sheet obtained by adding 10 to 50% by weight of carbon black to tetrafluoroethylene resin powder and adding a liquid lubricant to the mixture, in the width direction, longitudinal direction, or both directions. The sheet is stretched approximately 12 to 1.4 times, and this stretching gives the sheet a porous structure with continuous pores.
そして、この多孔質シートは、例えばエラストマーある
いはゴム変性ポリマーなどの熱膨張性高分子材料を有機
溶剤に溶解さ且た溶液によって含浸処理され、焼成され
ることなく用いられる。なお、熱膨張性高分子材料は、
導電性炭素物質と一緒に粉末状のものを混入するように
してもよい。Then, this porous sheet is impregnated with a solution in which a thermally expandable polymer material such as an elastomer or a rubber-modified polymer is dissolved in an organic solvent, and is used without being fired. In addition, the thermally expandable polymer material is
A powdered material may be mixed together with the conductive carbon material.
また、透過性外被６は、四フッ化エチレン樹脂１等の高
分子材料からなり、液状潤滑剤の種類や乾燥条件等は若
干異なるが、前記感知部２と同様な方法でシート状に成
形したものが使用される。このような成形方法により、
シート６は若干多孔質化し四フッ化エチレン樹脂のもつ
撥水性によりｉｔｈ等を選択的に透過させることができ
る。The permeable jacket 6 is made of a polymeric material such as tetrafluoroethylene resin 1, and is formed into a sheet in the same manner as the sensing part 2, although the type of liquid lubricant and drying conditions are slightly different. is used. With this molding method,
The sheet 6 is made slightly porous so that ith and the like can selectively pass therethrough due to the water repellency of the tetrafluoroethylene resin.
次に、熱膨張性高分子材料としてシリコーン系ポリマー
を５０％の重量比で感知部に混入したもの（実施例）と
、熱膨張性高分子材料を含まない従来品（比較例）につ
いて、感知部の体積抵抗率の温度依存性（抵抗変化率）
を調べるため、それぞれ３０℃から１００°Ｃの範囲で
ヒートザイクル試験を行なった。その結果を第２図に示
す。Next, we examined the sensing part of a sensor in which a silicone polymer was mixed at a weight ratio of 50% as a thermally expandable polymer material (example) and a conventional product that did not contain a thermally expandable polymer material (comparative example). Temperature dependence of volume resistivity (resistance change rate)
In order to investigate this, a heat cycle test was conducted in the range of 30°C to 100°C. The results are shown in FIG.
第２図から明らかな上うに、感知部に熱膨張件高分子＋
Ａ ＊Ａを混入してなる実施例は、それを含まない比較
例に比へて、温度変化に対ケる体積抵抗率の変化が極め
て小さいことがわかる。As is clear from Figure 2, thermal expansion polymer +
It can be seen that the examples in which A*A is mixed have extremely small changes in volume resistivity with respect to temperature changes, compared to the comparative examples that do not contain it.
以上説明したように、この発明では、感知部に熱膨張性
高分子子４料を混入１７、これにより導電性炭素物質を
担持する未焼成四フッ化エチレン樹脂の熱収縮を阻止す
る構成としたから、設置場所の温度が変化したときに、
感知部の体積抵抗率が従来のように変動することはなく
、センサとしての安定性が大幅に向」二する。As explained above, in this invention, four thermally expandable polymer molecules are mixed in the sensing part17, thereby preventing thermal contraction of the unfired tetrafluoroethylene resin supporting the conductive carbon material. , when the temperature of the installation location changes,
The volume resistivity of the sensing part does not fluctuate like in the past, and the stability of the sensor is greatly improved.
な４；、この発明はＪ二記実施例に限定されるものでは
なく、例えば導体の本数を増やしたり、あるいは形状を
変更したり、ガス検知センサに適用するなど、この発明
の技術思想内での種々の変更はもちろん可能である。4; This invention is not limited to the embodiment described in J2, and may be modified within the technical concept of this invention, such as increasing the number of conductors, changing the shape, or applying to a gas detection sensor. Of course, various changes are possible.
第１図はこの発明による検知センサの−・実施例を示す
一部を切り欠いた斜視図、第２図は第１図実施例の検知
センサと従来の検知センサの温度依存性を示す曲線であ
る。
２ 感知部、４．導体、６ 透過性外被。Fig. 1 is a partially cutaway perspective view showing an embodiment of the detection sensor according to the present invention, and Fig. 2 is a curve showing the temperature dependence of the detection sensor of the embodiment of Fig. 1 and a conventional detection sensor. be. 2 sensing section, 4. Conductor, 6 Transparent jacket.
Claims (1)
させて保持する導電性炭素物質が分散した未焼成四フッ
化エチレン樹脂からなる感知部と、この感知部の外側に
設けられる透過性外被を備える検知センサにおいて、前
記感知部に未焼成四フッ化エチレン樹脂の収縮を阻止す
る熱膨張性高分子材料を混入したことを特徴とする検知
センサ。(1) At least one pair of conductors, a sensing section made of unfired tetrafluoroethylene resin in which conductive carbon material is dispersed and which holds the conductors apart from each other, and a transparent outer layer provided outside the sensing section. What is claimed is: 1. A detection sensor comprising: a thermally expandable polymer material that prevents shrinkage of green tetrafluoroethylene resin;
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20742189A JPH0371052A (en) | 1989-08-10 | 1989-08-10 | Detecting sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20742189A JPH0371052A (en) | 1989-08-10 | 1989-08-10 | Detecting sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0371052A true JPH0371052A (en) | 1991-03-26 |
Family
ID=16539476
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20742189A Pending JPH0371052A (en) | 1989-08-10 | 1989-08-10 | Detecting sensor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0371052A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06347456A (en) * | 1993-06-08 | 1994-12-22 | Yuichi Moriki | Oil sensor |
| GB2433164B (en) * | 2004-11-23 | 2009-06-03 | Intel Corp | Switch structures or the like based on a thermoresponsive polymer |
-
1989
- 1989-08-10 JP JP20742189A patent/JPH0371052A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06347456A (en) * | 1993-06-08 | 1994-12-22 | Yuichi Moriki | Oil sensor |
| GB2433164B (en) * | 2004-11-23 | 2009-06-03 | Intel Corp | Switch structures or the like based on a thermoresponsive polymer |
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