JPH0692547B2 - Conductive paint - Google Patents
Conductive paintInfo
- Publication number
- JPH0692547B2 JPH0692547B2 JP62126244A JP12624487A JPH0692547B2 JP H0692547 B2 JPH0692547 B2 JP H0692547B2 JP 62126244 A JP62126244 A JP 62126244A JP 12624487 A JP12624487 A JP 12624487A JP H0692547 B2 JPH0692547 B2 JP H0692547B2
- Authority
- JP
- Japan
- Prior art keywords
- sliding
- resistance
- resistance value
- potassium titanate
- conductive paint
- 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.)
- Expired - Fee Related
Links
Landscapes
- Non-Adjustable Resistors (AREA)
- Conductive Materials (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Paints Or Removers (AREA)
- Adjustable Resistors (AREA)
Description
【発明の詳細な説明】 産業上の利用分野 本発明は、モース硬度３〜５のチタン酸カリウムを充填
剤として添加することで、摺動特性を飛躍的に向上させ
た例えば可変抵抗器用の導電塗料に関するものである。TECHNICAL FIELD The present invention relates to a conductive material for, for example, a variable resistor, which has dramatically improved sliding characteristics by adding potassium titanate having a Mohs hardness of 3 to 5 as a filler. It concerns paints.
従来の技術 従来、可変抵抗器の抵抗皮膜に使用される導電塗料は、
カーボンブラック，グラファイト又は、その混合物のパ
ウダー（以下カーボンパウダーと称する）を、適当な溶
剤に溶解した熱硬化性樹脂に分散させたものである。こ
の塗料は、スクリーン印刷法等により、主としてフェノ
ール積層板のような基体上に塗布され、熱重合によって
抵抗皮膜を形成する。この方法については一般的に広く
知られている。Conventional technology Conventionally, the conductive paint used for the resistance film of the variable resistor is
Powder of carbon black, graphite, or a mixture thereof (hereinafter referred to as carbon powder) is dispersed in a thermosetting resin dissolved in an appropriate solvent. This paint is mainly applied on a substrate such as a phenol laminate by a screen printing method or the like, and forms a resistance film by thermal polymerization. This method is generally widely known.
発明が解決しようとする問題点 皮膜の抵抗値は、用いるカーボンパウダーの比抵抗、及
び、樹脂に対する含有率によってコントロールされる。
カーボンパウダーはモース硬度が１〜２と低いこともあ
って皮膜の耐摩耗性は、一般的に弱くなる。Problems to be Solved by the Invention The resistance value of the film is controlled by the specific resistance of the carbon powder to be used and the content rate with respect to the resin.
Since the carbon powder has a low Mohs hardness of 1-2, the wear resistance of the coating is generally weak.
可変抵抗器では、皮膜上を刷子が摺動するため、前述の
理由によって、摺動回数と共に皮膜が削れ、抵抗値の変
動が非常に大きくなるという問題点があった。In the variable resistor, since the brush slides on the film, the film is scraped with the number of times of sliding due to the above-mentioned reason, and there is a problem that the variation of the resistance value becomes very large.
この抵抗値変動対策を目的にSiO2，Al2O3,TiN,SiC,ダイ
ヤモンドパウダー等の無機粉体を構造材として含有させ
た導電塗料が知られているが、刷子（金属製）の硬度よ
りも、これらの無機粉体の硬度が大であるために、これ
が刷子を逆に摩耗し、刷子の削れ粉が酸化されて絶縁物
となり、抵抗皮膜上に堆積して、摺動雑音を発生させる
という問題点があった。Conductive paints containing inorganic powders such as SiO 2 , Al 2 O 3 , TiN, SiC, and diamond powder as structural materials are known for the purpose of countering this resistance fluctuation, but the hardness of the brush (made of metal) is known. Since the hardness of these inorganic powders is higher than that of the brush, it wears the brush in the opposite direction, and the scraped powder of the brush is oxidized and becomes an insulator, which accumulates on the resistance film and generates sliding noise. There was a problem of making it.
本発明は、主としてこの摺動時の抵抗値変動が著しく小
であり、極めて安定した摺動特性が得られる抵抗印刷用
の導電塗料を提供することを目的とするものである。An object of the present invention is to provide a conductive coating material for resistance printing, in which the variation in resistance value during sliding is extremely small and extremely stable sliding characteristics can be obtained.
問題点を解決するための手段 本発明者らは、摺動時の抵抗値変動、及び摺動雑音と無
機粉体硬度との相関を種々研究した結果、モース硬度３
〜５のチタン酸カリウムを添加することで目的を達し得
ることを見い出した。公知であるAl2O3等前述の無機粉
体はモース硬度５以上（Al2O3＝9,SiO2＝7,SiC＝９〜1
0,ダイヤモンドパウダー＝10）であり、これらを用いた
場合では、添加量によっては、抵抗値変動を小さくでき
るが摺動雑音が大きくなり、逆にモース硬度１〜２（例
えばカーボンブラック，グラファイト，滑石等）を充填
剤とした場合は、摺動雑音は小さいが摺動時の抵抗値変
動が無添加の場合より非常に大きくなる。これは、抵抗
皮膜上を摺動する金属刷子のモース硬度が５〜６である
ために、それより硬い無機粉体では刷子が削れ、モース
硬度１〜２では柔かすぎて、接点圧の影響が大きくなる
ことが原因である。Means for Solving Problems The present inventors have conducted various studies on the variation in resistance value during sliding and the correlation between sliding noise and inorganic powder hardness.
It has been found that the goal can be achieved by adding ~ 5 potassium titanate. The above-mentioned inorganic powders such as known Al 2 O 3 have a Mohs hardness of 5 or more (Al 2 O 3 = 9, SiO 2 = 7, SiC = 9 to 1).
0, diamond powder = 10), and when these are used, the fluctuation in resistance value can be reduced depending on the added amount, but sliding noise increases, and conversely, Mohs hardness 1-2 (for example, carbon black, graphite, When a filler such as talc is used as the filler, the sliding noise is small, but the variation in the resistance value during sliding is much larger than that without addition. This is because the metal brush that slides on the resistance film has a Mohs hardness of 5 to 6, so the inorganic powder that is harder than that will scrape the brush, and a Mohs hardness of 1 or 2 will be too soft, and the influence of contact pressure will be affected. Is caused by the increase.
作用 本発明によれば、モース硬度３〜５のチタン酸カリウム
を用いることにより、摺動時の抵抗値変動が極めて少な
く、かつ摺動雑音を低いレベルに保つことが可能とな
る。特にモース硬度４の、平均繊維長が３〜40μｍ、繊
維径0.1〜10μｍのものを使用すると、殆ど摺動時の抵
抗値変動が無く、摺動雑音についても無機粉体無添加と
の比較において劣化が全く見られなかった。繊維状無機
粉体とする理由は塗膜としての内部構造強度が得られや
すいからである。Effect According to the present invention, the use of potassium titanate having a Mohs hardness of 3 to 5 makes it possible to keep resistance fluctuation during sliding extremely small and to keep the sliding noise at a low level. In particular, when a Mohs hardness of 4, an average fiber length of 3 to 40 μm, and a fiber diameter of 0.1 to 10 μm is used, there is almost no fluctuation in the resistance value during sliding, and sliding noise is also compared with that without adding inorganic powder. No deterioration was observed. The reason for using the fibrous inorganic powder is that the internal structural strength of the coating film can be easily obtained.
実施例 本発明の実施例および比較例を第１表に示す。Examples Examples and comparative examples of the present invention are shown in Table 1.
以下これについて説明する。This will be described below.
＜比較例１（試料No.1）＞ 樹脂，カーボンブラック，グラファイト，及び溶剤を混
合し、フェノール積層板上に所望の抵抗パターンにてス
クリーン塗布し、これを温度200℃にて10分加熱硬化さ
せ、このものに刷子，ケース等を取付け、可変抵抗器と
した。 <Comparative Example 1 (Sample No. 1)> Resin, carbon black, graphite, and a solvent were mixed and screen-coated with a desired resistance pattern on a phenol laminated plate, which was heated and cured at a temperature of 200 ° C for 10 minutes. Then, a brush, a case, etc. were attached to this product to form a variable resistor.
摺動特性については、15000回転後の抵抗値変動（％）
とVU雑音（dB）にて評価した。Regarding sliding characteristics, resistance value fluctuation (%) after 15,000 rotations
And VU noise (dB).
この場合、無機粉体添加が無いため、14％と極めて大き
な抵抗値変動が見られた。In this case, since no inorganic powder was added, a very large resistance value variation of 14% was observed.
＜比較例２（試料No.2,3）＞ 比較例１と同様の方法で導電塗料に添加剤として、Al2O
3（モース硬度９）を10重量％（以下wt％と称す）、30w
t％添加したものの摺動特性を調べた。その結果10wt％
では、抵抗値変動が大きく（構造材としての機能不十
分）、30wt％では、若干緩和されるものの、雑音が非常
に大である。<Comparative Example 2 (Sample Nos. 2 and 3)> Al 2 O was added as an additive to the conductive paint in the same manner as in Comparative Example 1.
3 (Mohs hardness 9) 10% by weight (hereinafter referred to as wt%), 30w
The sliding characteristics of the material with t% added were examined. As a result, 10 wt%
Shows a large fluctuation in the resistance value (insufficient function as a structural material), and at 30 wt%, it is slightly mitigated, but the noise is very large.
＜実施例（試料No.4〜６）＞ 比較例２と同様にして添加剤としてチタン酸カリウム繊
維を5wt％,30wt％,70wt％添加した。その結果、15000回
転後の抵抗値変動は−1.2〜0.5％と極めて小さく、摺動
雑音についても比較例１（無機粉体無添加）と同等の結
果が得られた。<Examples (Sample Nos. 4 to 6)> In the same manner as in Comparative Example 2, potassium titanate fibers were added as an additive at 5 wt%, 30 wt% and 70 wt%. As a result, the variation in resistance value after 15,000 rotations was extremely small at -1.2 to 0.5%, and the sliding noise was similar to that of Comparative Example 1 (no addition of inorganic powder).
なお、チタン酸カリウム繊維の添加量としては、2wt％
以下では、硬化が小であり、80wt％以上では、カーボン
パウダーの相対量が少なくなりすぎ、抵抗値のコントロ
ールがむずかしくなり実用性に欠けることが確認され
た。The amount of potassium titanate fiber added is 2 wt%
Below, it was confirmed that curing was small, and above 80 wt%, the relative amount of carbon powder was too small, making resistance control difficult and impractical.
発明の効果 以上述べたように、本発明による導電塗料を可変抵抗器
に使用した場合、殆ど摺動時の抵抗値変動が無く、かつ
摺動雑音を低いレベルに保つことが可能である。さらに
チタン酸カリウム等は安価であり、産業上極めて有用で
ある。Effects of the Invention As described above, when the conductive paint according to the present invention is used for the variable resistor, the resistance value hardly changes during sliding and the sliding noise can be kept at a low level. Furthermore, potassium titanate and the like are inexpensive and are extremely useful industrially.
フロントページの続き (56)参考文献 特開 昭61−7362（ＪＰ，Ａ) 特開 昭62−62872（ＪＰ，Ａ) 特開 昭57−102967（ＪＰ，Ａ)Continuation of the front page (56) Reference JP 61-7362 (JP, A) JP 62-62872 (JP, A) JP 57-102967 (JP, A)
Claims (2)
トの一つと、合成樹脂と、モース硬度３〜５のチタン酸
カリウムからなり、このチタン酸カリウムの含有量を５
〜70重量％とした導電塗料。1. At least one of carbon black and graphite, a synthetic resin, and potassium titanate having a Mohs hardness of 3 to 5, and the content of potassium titanate is 5
~ 70% by weight conductive paint.
ｍ、繊維径が0.1〜10μｍとする特許請求の範囲第１項
記載の導電塗料。2. The average fiber length of potassium titanate is 3 to 40 μm.
m, and the fiber diameter is 0.1 to 10 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62126244A JPH0692547B2 (en) | 1987-05-22 | 1987-05-22 | Conductive paint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62126244A JPH0692547B2 (en) | 1987-05-22 | 1987-05-22 | Conductive paint |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63289077A JPS63289077A (en) | 1988-11-25 |
| JPH0692547B2 true JPH0692547B2 (en) | 1994-11-16 |
Family
ID=14930364
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62126244A Expired - Fee Related JPH0692547B2 (en) | 1987-05-22 | 1987-05-22 | Conductive paint |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0692547B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2779810B2 (en) * | 1988-04-27 | 1998-07-23 | イビデン株式会社 | Resin resistance paste |
| JPH04168146A (en) * | 1990-10-31 | 1992-06-16 | Sumitomo Bakelite Co Ltd | Electrically conductive phenolic resin molding material |
| JP6657740B2 (en) * | 2015-10-06 | 2020-03-04 | 日立化成株式会社 | Sliding material, molded product thereof, and sliding member |
| JP6728769B2 (en) * | 2016-02-29 | 2020-07-22 | 日立化成株式会社 | Sliding member |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57102967A (en) * | 1980-12-18 | 1982-06-26 | Otsuka Chem Co Ltd | Heat-insulating coat composition |
| JPS617362A (en) * | 1984-06-22 | 1986-01-14 | Yazaki Corp | Conductive elastomer coating |
| JPH064789B2 (en) * | 1985-09-12 | 1994-01-19 | セイコ−化成株式会社 | Method for producing thin film conductive material |
-
1987
- 1987-05-22 JP JP62126244A patent/JPH0692547B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63289077A (en) | 1988-11-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |