JP2001055481A - Resin composition and organic ptc element - Google Patents
Resin composition and organic ptc elementInfo
- Publication number
- JP2001055481A JP2001055481A JP11234249A JP23424999A JP2001055481A JP 2001055481 A JP2001055481 A JP 2001055481A JP 11234249 A JP11234249 A JP 11234249A JP 23424999 A JP23424999 A JP 23424999A JP 2001055481 A JP2001055481 A JP 2001055481A
- Authority
- JP
- Japan
- Prior art keywords
- resin composition
- ptc element
- organic ptc
- resin
- organic
- 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
Landscapes
- Resistance Heating (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Thermistors And Varistors (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、樹脂に導電性粒子
を分散してなり、ＰＴＣ挙動を示す樹脂組成物、並びに
前記樹脂組成物を用いた有機ＰＴＣ素子に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin composition obtained by dispersing conductive particles in a resin and exhibiting PTC behavior, and an organic PTC element using the resin composition.
【０００２】[0002]
【従来の技術】従来より、樹脂材料にカーボンブラック
等の導電性粒子を分散させて得られ、ＰＴＣ挙動を示す
樹脂組成物が知られている。この樹脂組成物は、図１に
示すように、電流が流れることにより自己発熱し、ある
温度（スイッチング温度）に達すると急激に抵抗値が上
昇する特性を有しており、この樹脂組成物をシート材と
なし一対の電極で挟持した所謂有機ＰＴＣ素子として広
く利用されている。2. Description of the Related Art Conventionally, there has been known a resin composition which is obtained by dispersing conductive particles such as carbon black in a resin material and exhibits PTC behavior. As shown in FIG. 1, this resin composition has a characteristic that it self-heats when a current flows, and has a characteristic that the resistance value rapidly rises when a certain temperature (switching temperature) is reached. It is widely used as a so-called organic PTC element sandwiched between a pair of electrodes without a sheet material.
【０００３】この有機ＰＴＣ素子は、スイッチング温度
を境界として流れる電流値を抑制する機能を有すること
から、例えば電流制限機能を有する保護機構等に利用さ
れている。また、近年では、自動車の電装部品の保護回
路としてエンジンルーム内に設置されるようになってき
ている。しかし、自動車のエンジンルーム内は高温に晒
されるため、使用される有機ＰＴＣ素子には、通常、１
００℃以上の高温環境において安定に動作することが要
求されている。This organic PTC element has a function of suppressing a current value flowing at a switching temperature as a boundary, and is therefore used, for example, in a protection mechanism having a current limiting function. In recent years, it has been increasingly installed in an engine room as a protection circuit for electrical components of an automobile. However, since the interior of the engine room of an automobile is exposed to high temperatures, the organic PTC element used usually includes one.
It is required to operate stably in a high temperature environment of 00 ° C. or higher.
【０００４】このような高温環境において安定して動作
するためには、有機ＰＴＣ素子のスイッチング温度が周
囲温度よりさらに高いことが必要である。これは、自己
発熱ではなく、周囲温度により自身の抵抗値が上昇した
のでは、電流制限素子としての機能が得られないからで
ある。In order to operate stably in such a high temperature environment, the switching temperature of the organic PTC element needs to be higher than the ambient temperature. This is because the function as the current limiting element cannot be obtained if the resistance value of the element itself increases due to the ambient temperature instead of the self-heating.
【０００５】有機ＰＴＣ素子のスイッチング温度をより
高めるために、例えば、特公昭６０−３４７９２号公報
や特公平３―３４４９８号公報では、樹脂としてポリフ
ッ化ビニリデンを用いることを提案している。In order to further increase the switching temperature of the organic PTC element, for example, Japanese Patent Publication No. 60-34792 and Japanese Patent Publication No. 3-34498 propose using polyvinylidene fluoride as a resin.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、前述し
たポリフッ化ビニリデンは、極めて高価であるという問
題に加えて、有機ＰＴＣ素子とする際の導電性粒子との
混練や成形に際して高温を要し、製造コストも高くなる
という問題がある。そこで本発明は、周囲温度が１００
℃以上の高温でも安定に動作する有機ＰＴＣ素子を安価
に提供することを目的とする。However, in addition to the problem that polyvinylidene fluoride is extremely expensive, the above-mentioned polyvinylidene fluoride requires a high temperature for kneading and molding with conductive particles when forming an organic PTC element, and is thus difficult to manufacture. There is a problem that the cost increases. Therefore, the present invention provides a method for controlling an ambient temperature of 100
It is an object of the present invention to provide an inexpensive organic PTC element that operates stably even at a high temperature of not less than ° C.
【０００７】[0007]
【課題を解決するための手段】上記の目的を達成するた
めに、本発明は、ポリアセタールを主成分とする樹脂に
導電性粒子を分散してなり、ＰＴＣ挙動を示すことを特
徴とする樹脂組成物、並びに前記の樹脂組成物からなる
シート材を一対の電極で挟持してなることを特徴とする
有機ＰＴＣ素子を提供する。In order to achieve the above-mentioned object, the present invention provides a resin composition characterized by dispersing conductive particles in a resin containing polyacetal as a main component and exhibiting PTC behavior. An organic PTC element characterized in that a product and a sheet material made of the above resin composition are sandwiched between a pair of electrodes.
【０００８】[0008]
【発明の実施の形態】以下、本発明に関して詳細に説明
する。本発明における樹脂は、ポリアセタールを主成分
とする。このポリアセタールは、ポリフッ化ビニリデン
に比較して市場価格が約1/10以下であり、また混練やプ
レス時に必要とされる加熱温度もポリフッ化ビニリデン
を用いる場合に比較して低く、低コストで大量生産に適
するという優位性がある。BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail. The resin in the present invention contains polyacetal as a main component. This polyacetal has a market price of about 1/10 or less compared to polyvinylidene fluoride, and the heating temperature required for kneading and pressing is lower than when polyvinylidene fluoride is used. It has the advantage of being suitable for production.
【０００９】また、ＰＴＣ特性を制御するために、ポリ
アセタールに他の樹脂を添加し，スイッチング温度を調
整することもできる。ただし、高温での動作、ポリアセ
タールを用いることによる経済性が損なわれない程度の
範囲で添加物の種類とその添加割合を決定する必要があ
る。Further, in order to control the PTC characteristics, another resin may be added to the polyacetal to adjust the switching temperature. However, it is necessary to determine the types of additives and their proportions within a range that does not impair the economics of operating at high temperatures and using polyacetal.
【００１０】上記のポリアセタールを主成分とする樹脂
に、導電性粒子を配合して本発明の樹脂組成物が得られ
る。この導電性粒子は、代表的にはカーボンブラックが
用いられる。また、導電性粒子の配合量は、樹脂組成物
全量の２０〜４０wt％であることが好ましい。導電性粒
子の配合量がこの範囲以下では、必要とする常温での導
電性が得られず、またこの範囲以上では低抵抗とはなる
が、ジャンプ幅が小さくなるので好ましくない。[0010] The resin composition of the present invention can be obtained by blending conductive particles with the resin containing polyacetal as a main component. As the conductive particles, carbon black is typically used. The amount of the conductive particles is preferably 20 to 40% by weight of the total amount of the resin composition. If the amount of the conductive particles is less than this range, the required conductivity at normal temperature cannot be obtained. If the amount is more than this range, the resistance will be low, but the jump width will be small, which is not preferable.
【００１１】また、上記の樹脂組成物を所定の厚さのシ
ート材に成形し、一対の電極で挟持して本発明の有機Ｐ
ＴＣ素子が得られる。尚、電極は、銅やニッケル、アル
ミニウム等の公知のもので構わない。また、電極として
は、スパッタ法等の適当な成膜方法を利用したものを採
用してもよい。また、積層構造の電極を採用してもよ
い。Further, the above-described resin composition is formed into a sheet material having a predetermined thickness, and is sandwiched between a pair of electrodes to form the organic P of the present invention.
A TC element is obtained. Note that the electrode may be a known electrode such as copper, nickel, or aluminum. Further, as the electrode, an electrode using an appropriate film forming method such as a sputtering method may be employed. Further, an electrode having a laminated structure may be employed.
【００１２】[0012]
【実施例】以下、実施例及び比較例を挙げて本発明を更
に説明する。ポリアセタールとカーボンブラックとを表
１に示す割合で混合し、１７０℃にて２０分混練して樹
脂組成物を得た。次に、この樹脂組成物を熱プレス法及
び冷却プレスにより、厚さ0.7mm のシート状に成形し
た。ここで、熱プレス条件は、１７０℃、５０kgf/c
m2、３分プレスとした。The present invention will be further described below with reference to examples and comparative examples. Polyacetal and carbon black were mixed at the ratio shown in Table 1 and kneaded at 170 ° C. for 20 minutes to obtain a resin composition. Next, the resin composition was formed into a sheet having a thickness of 0.7 mm by a hot press method and a cooling press. Here, the hot pressing condition is 170 ° C., 50 kgf / c
m 2 , and pressed for 3 minutes.
【００１３】[0013]
【表１】 [Table 1]
【００１４】次に、シート状に形成された樹脂成型物の
両面に厚さ２５μｍの電解銅箔を熱プレス及び冷却プレ
スにより貼り付けた。ここで、熱プレス条件は、１７０
℃、５０kgf/cm2、３分プレスとした。Next, an electrolytic copper foil having a thickness of 25 μm was attached to both surfaces of the resin molded article formed in a sheet shape by a hot press and a cooling press. Here, the hot pressing condition is 170
Pressed at 50 ° C, 50 kgf / cm 2 for 3 minutes.
【００１５】この電極形成工程により、全体の厚さは0.
5mmとなった。次に打ち抜きを行い、15mm角で厚さが0.5
mmの有機ＰＴＣ素子を得た。According to this electrode forming step, the total thickness is reduced to 0.1.
It became 5 mm. Next, punched out, 15mm square and 0.5mm thick
Thus, an organic PTC element having a thickness of mm was obtained.
【００１６】得られた各有機ＰＴＣ素子について、温度
と比抵抗との関係を調べた。表１及び図２に結果を示す
が、何れの有機ＰＴＣ素子もスイッチング温度が１５０
℃以上と高く、高温環境で安定した動作が得られること
がわかる。また，カーボンブラックの配合量が増すほ
ど、導電性は良くなるが、ジャンプ幅が小さくなってお
り、カーボンブラック量としては２０wt％〜４０wt％の
範囲が適当であると言える。With respect to each of the obtained organic PTC devices, the relationship between the temperature and the specific resistance was examined. The results are shown in Table 1 and FIG. 2, where the switching temperature was 150
It is understood that stable operation can be obtained in a high temperature environment, which is as high as at least ℃. Also, as the blending amount of carbon black increases, the conductivity improves, but the jump width decreases, and it can be said that the range of 20 wt% to 40 wt% is appropriate as the amount of carbon black.
【００１７】また、比較のために、ポリエチレン６５wt
％とカーボンブラック３５wt％との樹脂組成物を用い、
上記と同様にして有機ＰＴＣ素子を作製し、その温度と
比抵抗との関係を調べた。For comparison, polyethylene 65 wt.
% And a resin composition of 35 wt% of carbon black,
An organic PTC element was produced in the same manner as above, and the relationship between the temperature and the specific resistance was examined.
【００１８】結果を図３に示す。尚、比較のために、上
記のポリアセタール８０wt％とカーボンブラック２０wt
％との樹脂組成物からなる有機ＰＴＣ素子の結果を同図
に併記してある。図示されるように、ポリエチレンを樹
脂とする有機ＰＴＣ素子はスイッチング温度が約１２０
℃と低く、本発明のポリアセタールを樹脂とする有機Ｐ
ＴＣ素子の高温環境での優位性が確認された。FIG. 3 shows the results. For comparison, 80 wt% of the above polyacetal and 20 wt% of carbon black were used.
%, The results of the organic PTC element comprising the resin composition are also shown in FIG. As shown in the figure, an organic PTC element using polyethylene as a resin has a switching temperature of about 120.
℃, organic P using the polyacetal of the present invention as a resin
The superiority of the TC element in a high temperature environment was confirmed.
【００１９】[0019]
【発明の効果】以上説明したように、本発明によれば、
高温で動作する有機ＰＴＣ素子をより安価に提供するこ
とができる。As described above, according to the present invention,
An organic PTC element that operates at a high temperature can be provided at lower cost.
【図１】有機ＰＴＣ素子のスイッチング温度及びジャン
プ幅を説明するためのグラフである。FIG. 1 is a graph illustrating a switching temperature and a jump width of an organic PTC element.
【図２】実施例において各有機ＰＴＣ素子の温度−比抵
抗特性を測定した結果を示すグラフである。FIG. 2 is a graph showing the results of measuring the temperature-resistivity characteristics of each organic PTC element in Examples.
【図３】樹脂にポリエチレンとポリアセタールを用いた
各有機ＰＴＣ素子の温度−比抵抗特性を比較するグラフ
である。FIG. 3 is a graph comparing temperature-resistivity characteristics of respective organic PTC elements using polyethylene and polyacetal as resins.
Claims (3)
性粒子を分散してなり、ＰＴＣ挙動を示すことを特徴と
する樹脂組成物。1. A resin composition comprising conductive resin dispersed in a resin containing polyacetal as a main component and exhibiting PTC behavior.
０℃以上であることを特徴とする請求項１記載の樹脂組
成物。2. The switching temperature which exhibits PTC behavior is 15
The resin composition according to claim 1, wherein the temperature is 0C or higher.
なるシート材を一対の電極で挟持してなることを特徴と
する有機ＰＴＣ素子。3. An organic PTC element comprising a sheet material comprising the resin composition according to claim 1 sandwiched between a pair of electrodes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11234249A JP2001055481A (en) | 1999-08-20 | 1999-08-20 | Resin composition and organic ptc element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11234249A JP2001055481A (en) | 1999-08-20 | 1999-08-20 | Resin composition and organic ptc element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001055481A true JP2001055481A (en) | 2001-02-27 |
Family
ID=16968020
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11234249A Pending JP2001055481A (en) | 1999-08-20 | 1999-08-20 | Resin composition and organic ptc element |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001055481A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20190137866A (en) * | 2017-04-07 | 2019-12-11 | 엘텍 에스.피.에이. | Such materials, including PTC-effect composite materials, corresponding manufacturing methods, and heater devices |
-
1999
- 1999-08-20 JP JP11234249A patent/JP2001055481A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20190137866A (en) * | 2017-04-07 | 2019-12-11 | 엘텍 에스.피.에이. | Such materials, including PTC-effect composite materials, corresponding manufacturing methods, and heater devices |
| CN110785823A (en) * | 2017-04-07 | 2020-02-11 | 埃尔特克有限公司 | PTC-effect composite material, corresponding production method and heater device comprising such material |
| JP2020517101A (en) * | 2017-04-07 | 2020-06-11 | エルテック・ソチエタ・ペル・アツィオーニＥｌｔｅｋ Ｓ．Ｐ．Ａ． | PTC effect composite material, corresponding production method and heating device containing such material |
| CN110785823B (en) * | 2017-04-07 | 2022-07-15 | 埃尔特克有限公司 | PTC-effect composite material, corresponding production method and heater device comprising such a material |
| JP7177080B2 (en) | 2017-04-07 | 2022-11-22 | エルテック・ソチエタ・ペル・アツィオーニ | PTC effect composite materials, corresponding production methods and heating devices containing such materials |
| KR102480578B1 (en) * | 2017-04-07 | 2022-12-22 | 엘텍 에스.피.에이. | Such materials, including PTC-effect composite materials, corresponding manufacturing methods, and heater devices |
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