JP3674200B2

JP3674200B2 - Insulated wire with surface lubricity

Info

Publication number: JP3674200B2
Application number: JP33584896A
Authority: JP
Inventors: 和重田村; 敏秀大塚
Original assignee: Kaneka Corp
Current assignee: Kaneka Corp
Priority date: 1996-12-16
Filing date: 1996-12-16
Publication date: 2005-07-20
Anticipated expiration: 2016-12-16
Also published as: JPH10172355A

Description

【０００１】
【発明の属する技術分野】
本発明は、例えば偏向ヨーク等のコイルの製造に用いられる絶縁電線に関し、さらに詳しくは表面に潤滑性を有する絶縁電線、およびその製造方法、ならびにそれに用いる焼付塗膜形成用塗料に関するものである。
【０００２】
【従来の技術】
近年、モーター、トランス、偏向ヨーク等の電気機器用のコイルを製造する場合、高速自動巻線機を使用して高速かつ高密度で絶縁電線をコイル巻きする。このため、前記のような用途に用いる絶縁電線には、高速でコイル巻き作業を行っても、表面の絶縁皮膜が傷付いたり、絶縁特性が低下することなく、また高密度にコイル巻きしてコイル中の導体占積率を高めることができるように、皮膜表面のすべり性の向上が強く求められている。
【０００３】
また、導体上に絶縁皮膜を介して融着皮膜を塗布焼付した、いわゆる自己融着性絶縁電線は、コイル巻線後、加熱または溶剤処理により前記融着皮膜を溶解または膨潤させることで線間相互を融着固化せしめ得ることから簡単に自己支持型のコイルを作ることが可能であり、複雑な形状のコイル巻線に広く利用されている。しかし、この自己融着性絶縁電線の融着皮膜は、接着力を高める方向で検討が進められており、表面滑性、すなわち皮膜表面のすべり性に劣り、また巻金型からの離型性が悪い欠点がある。さらに、偏向ヨークとして使用する場合、画像特性を良好にするためには、コイルの形状、外径寸法を均一化することが不可欠であるが、そのためには自己融着性絶縁電線の表面のすべり性を向上、均一化させることが必須である。
【０００４】
これらの課題を解決するため、絶縁電線の最外層の皮膜に潤滑性を付与することで、電線表面のすべり性を向上せしめる手段が採用されている。その方法としては、例えば、最外層の焼付塗膜形成用塗料中に滑剤を添加したり、塗料の焼付後、その表面に滑剤を塗布する方法等がある。
【０００５】
前者の焼付塗膜形成用塗料への添加型滑剤としては、モンタン酸ワックス、カルナバワックス、パラフィンワックス等のワックス類、シリコーンオイル等の潤滑油、フッ素樹脂、ポリエチレン、ポリプロピレン等の合成樹脂粉末等が用いられている。また、後者の塗布型滑剤としては、流動パラフィン、スピンドル、または固型パラフィンもしくはワックス等を有機溶剤に溶解または分散させた溶液が用いられている。
【０００６】
【発明が解決しようとする課題】
しかしながら、上記のような従来の方法では次のような問題があった。すなわち前者の添加型滑剤の場合、絶縁電線表面のすべり性を改善するためには、滑性物質を塗料中に多量に配合しなければならず、そのために皮膜が失透したり、塗料の分離、沈殿を招く恐れがあり、しかも十分なすべり性が得られない。また滑剤の沸点が塗料の溶剤の沸点に近い場合は、塗料の焼付乾燥時にこれが揮散し、場合によっては皮膜中にほとんど残存せず、すべり性向上効果を発揮できない。また、後者の塗布型滑剤の場合には、塗料焼付後に塗布するため、滑剤の塗布工程が余分に必要となること、さらには滑剤を皮膜表面に均一に塗布することが困難で安定したすべり性が得られ難いという問題がある。また一部表面焼付塗膜が損傷したり、自己融着線として用いる場合には巻線工程後の接着処理において過剰の滑剤のため接着不良を生じたり、滑剤飛散による汚染事故の発生がしばしば見受けられる。
【０００７】
これらの課題を解決するために、例えば特開平１−２７１１３号公報には、融着塗料に脂肪酸の多価アルコールエステル化合物を添加する方法が開示されている。しかしこの方法では、得られた自己融着性絶縁電線の静摩擦係数は最小でも０．０６程度である。ところが、静摩擦係数が０．０６以上である場合にはすべり性が十分ではなく、表面塗布剤等の他の滑剤を併用しないとコイル巻が困難となるという問題点がある。
【０００８】
そこで本発明は、上記の点に鑑み、絶縁電線における表面のすべり性を向上、かつ安定化させて高速かつ高密度で絶縁電線をコイル巻することができ、しかも自己融着性絶縁電線として用いた場合にも、自己融着性や金型離型性を低下させることがなく、これにより形成されるコイルの形状、外径寸法を安定化させることができる表面潤滑性を有する絶縁電線を提供せんとするものである。
【０００９】
【課題を解決するための手段】
上記の目的を解決するため、本発明に係る表面潤滑性を有する絶縁電線は、最外層塗膜焼付形成用塗料中に滑剤を添加することで表面に潤滑性を付与してなる絶縁電線において、滑剤として特定組成のものを使用することにより上記の課題の解決を図ったものである。すなわち本発明に係る表面潤滑性を有する絶縁電線は、ペンタエリスリトールまたはジペンタエリスリトールの少なくとも１種と分子内炭素数が１０〜１４である飽和脂肪酸の少なくとも１種とのエステル反応物を滑剤とし、これを塗料中の樹脂分１００重量部に対して０．５〜１０．０重量部含有する焼付塗膜形成用塗料を導体上に直接あるいは他の絶縁層を介して塗布焼き付けて、最外層に潤滑性皮膜を成形してなり、その潤滑性皮膜の静摩擦係数が荷重２００ｇ時０．０２〜０．０５の範囲内にあることを特徴とする絶縁電線である。
【００１０】
前記のように、焼付塗膜形成用塗料中の樹脂分１００重量部に対して滑剤としての前記エステル反応物を０．５〜１０．０重量部となるように添加することで、荷重２００ｇ時における表面の静摩擦係数が０．０２〜０．０５であるすべり性の良い絶縁電線を得ることができるのであり、前記エステル反応物の添加量が０．５重量部未満では滑剤としての効果がなく、また１０．０重量部を超えると逆にすべり性が低下する傾向にある。より好ましくは、塗料への前記エステル反応物の添加量は塗料中の樹脂分１００重量部に対して１．０〜５．０重量部の範囲である。
【００１１】
また、前記飽和脂肪酸は、炭素数が１０〜１４の長鎖脂肪酸である。炭素数が９以下あるいは１５以上のものでは表面の静摩擦係数が０．０６以上となり、すべり性が悪い。
【００１２】
さらに、前記エステル反応物における分子内の飽和脂肪酸基の数が２以下の場合にはすべり性が悪くなる傾向にある。このため前記エステル反応物の分子内の脂肪酸基の数は３以上のものが好ましい。
【００１３】
本発明において添加型滑剤として用いられる前記エステル反応物が優れた潤滑性を発揮する理由については必ずしも明確ではないが、前記エステル反応物が焼付塗膜形成用塗料に一般的に使用される溶剤に可溶であって該塗料中に均一に溶け込んでいるため、焼付工程中で該塗料中の溶媒が蒸発するに従い、塗料中に溶け込むことができなくなったエステル反応物が安定的に皮膜の表面へ拡散移行し、皮膜が形成される段階では分子鎖の長いメチレン基を外側に向けて配列し優れた潤滑機能を付与するためであると考えられる。
【００１４】
【発明の実施の形態】
本発明に用いる焼付塗膜形成用塗料としては、例えばポリビニルホルマール、ポリウレタン、ポリエステル、ポリエステルイミド、ポリアミドイミド、ポリアミド、エポキシ等の樹脂を有機溶剤に溶解してなるものが挙げられる。本発明は前記樹脂を限定するものではないが、最外層が自己融着層である自己融着性絶縁電線の場合に本発明の効果が最も顕著であることから、前記の各種塗料の中でも融着樹脂として最も一般的で広く使用されているポリアミド樹脂を有機溶剤に溶解させてなる融着性塗料を用いることがより好ましい。
【００１５】
また前記樹脂を前記エステル反応物からなる滑剤とともに溶解してなる有機溶剤としては、これらの良溶媒であればいかなるものでも使用可能であり、例えば、クレゾール、フェノール、キシレノール、Ｎ，Ｎ−ジメチルホルムアミド、Ｎ，Ｎ−ジメチルアセトアミド、Ｎ−メチルピロリドン等があり、これらを単独で、または二種以上を併用することもできる。また必要に応じてソルベントナフサ、キシレン等の貧溶媒を上記のような良溶媒とともに併用することもできる。
【００１６】
本発明で滑剤として用いられるエステル反応物は、ペンタエリスリトール、ジペンタエリスリトールまたはこれらの混合物と、飽和長鎖脂肪酸から容易に合成できる。
【００１７】
前記飽和脂肪酸の具体例としては、デカン酸、ウンデカン酸、ドデカン酸、トリデカン酸、テトラデカン酸等が挙げられる。
【００１８】
前記のようなペンタエリスリトール、ジペンタエリスリトールまたはこれらの混合物と、飽和長鎖脂肪酸とから合成されるエステル反応物を例示すれば、以下のようなものがある。
【００１９】
下記構造式（１）で表されるペンタエリスリトールのテトラエステル。
【００２０】
【化７】

【００２１】
［式中Ｒは−ＣＯ−Ｃ_nＨ_2n+1（但しｎは９〜１３の整数）で表される飽和脂肪酸基であり、それらは必ずしも同じである必要はない。］
【００２２】
下記構造式（２）で表されるペンタエリスリトールのトリエステル。
【００２３】
【化８】

【００２４】
［式中Ｒは−ＣＯ−Ｃ_nＨ_2n+1（但しｎは９〜１３の整数）で表される飽和脂肪酸基であり、それらは必ずしも同じである必要はない。］
【００２５】
下記構造式（３）で表されるジペンタエリスリトールのへキサエステル。
【００２６】
【化９】

【００２７】
［式中Ｒ¹〜Ｒ⁶は−ＣＯ−Ｃ_nＨ_2n+1（但しｎは９〜１３の整数）で表される飽和脂肪酸基であり、それらは必ずしも同じである必要はない。］
【００２８】
下記構造式（４）で表されるジペンタエリスリトールのペンタエステル。
【００２９】
【化１０】

［式中Ｒ¹〜Ｒ⁶のいずれか１つは−Ｈであり、残りの５つは−ＣＯ−Ｃ_nＨ_2n+1（但しｎは９〜１３の整数）で表される飽和脂肪酸基であり、それらは必ずしも同じである必要はない。］
【００３０】
下記構造式（５）で表されるジペンタエリスリトールのテトラエステル。
【００３１】
【化１１】

【００３２】
［式中Ｒ¹〜Ｒ⁶のいずれか２つは−Ｈであり、残りの４つは−ＣＯ−Ｃ_nＨ_2n+1（但しｎは９〜１３の整数）で表される飽和脂肪酸基であり、それらは必ずしも同じである必要はない。］
【００３３】
下記構造式（６）で表されるジペンタエリスリトールのトリエステル。
【００３４】
【化１２】

【００３５】
［式中Ｒ¹〜Ｒ⁶のいずれか３つは−Ｈであり、残りの３つは−ＣＯ−Ｃ_nＨ_2n+1（但しｎは９〜１３の整数）で表される飽和脂肪酸基であり、それらは必ずしも同じである必要はない。］
【００３６】
この中でも、ペンタエリスリトールテトラドデカノエート、ペンタエリスリトールテトラデカノエート、ペンタエリスリトールテトラテトラデカノエート、ジペンタエリスリトールヘキサドデカノエート等が好ましく、さらにその中でも、ペンタエリスリトールテトラドデカノエートが、合成が簡単で、入手が容易であり、かつ安価であることから特に好ましい。
【００３７】
【実施例】
（実施例１）
攪拌機、温度計を備えた２リットル容量の四つ口フラスコに、ポリアミド樹脂Ａ（ダイアミド４５１；ダイセルヒュルス社製）を１８０ｇ、クレゾールを５０４ｇ、キシレンを２１６ｇ、滑剤Ｃ（ペンタエリスリトールテトラドデカノエート）を５．４ｇ（前記ポリアミド樹脂Ａの１００重量部に対して３重量部）を加えて約５０℃の温度に加温攪拌し、融着性塗料を得た。この融着性塗料を、炉長が３．０ｍ、炉温が３００℃、線速が３６ｍ／ｍｉｎの条件で、導体径が０．２５ｍｍ、仕上外径が０．２９ｍｍのポリエステルイミド絶縁電線上に３回塗布焼付を繰り返し、焼付皮膜厚さ１０μｍの自己融着性絶縁電線を得た。
【００３８】
（実施例２）
滑剤Ｃの添加量を０．９ｇ（前記ポリアミド樹脂１００重量部に対して０．５重量部）とした以外は実施例１と同様の融着塗料を実施例１と同様の方法でポリエステルイミド絶縁電線上に塗布焼付し、焼付皮膜厚さ１０μｍの自己融着性絶縁電線を得た。
【００３９】
（実施例３）
ポリアミド樹脂をポリアミド樹脂Ｂ（プラタボンドＭ１２７６；日本リルサン社製）とした以外は実施例１と同様の融着塗料を実施例１と同様の方法でポリエステルイミド絶縁電線上に塗布焼付し、焼付皮膜厚さ１０μｍの自己融着性絶縁電線を得た。
【００４０】
（実施例４）
滑剤を滑剤Ｄ（ペンタエリスリトールテトラテトラデカノエート）とした以外は実施例１と同様の融着塗料を実施例１と同様の方法でポリエステルイミド絶縁電線上に塗布焼付し、焼付皮膜厚さ１０μｍの自己融着性絶縁電線を得た。
【００４１】
（実施例５）
滑剤を滑剤Ｅ（ペンタエリスリトールテトラデカノエート）とした以外は実施例１と同様の融着塗料を実施例１と同様の方法でポリエステルイミド絶縁電線上に塗布焼付し、焼付皮膜厚さ１０μｍの自己融着性絶縁電線を得た。
【００４２】
（実施例６）
滑剤を滑剤Ｆ（ジペンタエリスリトールヘキサドデカノエート）とした以外は実施例１と同様の融着塗料を実施例１と同様の方法でポリエステルイミド絶縁電線上に塗布焼付し、焼付皮膜厚さ１０μｍの自己融着性絶縁電線を得た。
【００４３】
（比較例１）
滑剤を未添加とした以外は実施例１と同様の融着塗料を実施例１と同様の方法でポリエステルイミド絶縁電線上に塗布焼付し、焼付皮膜厚さ１０μｍの自己融着性絶縁電線を得た。
【００４４】
（比較例２）
滑剤を滑剤Ｇ（ヘキストＥ；へキストジャパン社製）とした以外は実施例１と同様の融着塗料を実施例１と同様の方法でポリエステルイミド絶縁電線上に塗布焼付し、焼付皮膜厚さ１０μｍの自己融着性絶縁電線を得た。
【００４５】
（比較例３）
滑剤を滑剤Ｈ（ホスタルブＷＥ４；へキストジャパン社製）とした以外は実施例１と同様の融着塗料を実施例１と同様の方法でポリエステルイミド絶縁電線上に塗布焼付し、焼付皮膜厚さ１０μｍの自己融着性絶縁電線を得た。
【００４６】
（比較例４）
滑剤を滑剤Ｉ（ポリエチレン粉末）とした以外は実施例１と同様の融着塗料を実施例１と同様の方法でポリエステルイミド絶縁電線上に塗布焼付し、焼付皮膜厚さ１０μｍの自己融着性絶縁電線を得た。
【００４７】
（比較例５）
滑剤を滑剤Ｊ（ペンタエリスリトールテトラオクタデカノエート）とした以外は実施例１と同様の融着塗料を実施例１と同様の方法でポリエステルイミド絶縁電線上に塗布焼付し、焼付皮膜厚さ１０μｍの自己融着性絶縁電線を得た。
【００４８】
（比較例６）
滑剤を滑剤Ｋ（ペンタエリスリトールテトラオクタノエート）とした以外は実施例１と同様の融着塗料を実施例１と同様の方法でポリエステルイミド絶縁電線上に塗布焼付し、焼付皮膜厚さ１０μｍの自己融着性絶縁電線を得た。
【００４９】
以上の実施例および比較例で得られた自己融着性絶縁電線の特性として、その外観、絶縁破壊電圧、静摩擦係数を、またコイル特性として接着性と金型離型性の評価を実施した。これらの結果を、使用した融着性塗料の配合条件と併せて下記の表１に示した。
【００５０】
尚、絶縁破壊電圧についてはＪＩＳＣ３００３のエナメル銅線およびエナメルアルミニウム線試験方法に準じて行った。また、静摩擦係数は、水平に保ったすべり台上に試験片を２本平行に張り、また同一試験片を荷重２００ｇのスライダー上に２本平行に張った後、すべり台上の試験片とスライダー上の試験片が直行するように定位置に置き、この状態から、すべり台を１目盛（タンゼント目盛０．０１）傾斜させ止めた後バイブレーンョンを約１秒間３回与え、これをスライダーがすべり始めるまで繰り返し、スライダーがすべり始めたときのすべり台の角度から測定した。さらに、金型離型性については、得られた自己融着性絶縁電線を偏向ヨークコイル巻線機でコイル巻きして偏向ヨークコイルを作成する際に、通電加熱、プレス冷却後、金型からコイルを取り出す際に、金型とコイルが接着している部分がある場合を不良、そうでない場合を良好とした。そして、接着性に関しては、成形後の偏向ヨークコイルの内側部分１、２ターンの融着力をテンションゲージで測定し、融着力の平均値が３００ｇ以上の場合を良好、それ未満の場合を不良とした。
【００５１】
【表１】

【００５２】
【発明の効果】
以上の結果から、本発明の絶縁電線は、絶縁特性が良好であるとともに、表面のすべり性にも優れていることがわかる。したがって本発明の表面潤滑性を有する絶縁電線を用いると、高速、高密度巻線時に皮膜の傷や絶縁不良もなく、また、自己融着性絶縁電線として用いた場合も、表面のすべり性が良好であるため、コイルの形状、外径寸法が安定し、また、巻金型からの離型性も良好であり、かつ接着性不良を起こすこともないため、偏向ヨーク等のコイルの生産性が向上する。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an insulated wire used for manufacturing a coil such as a deflection yoke, for example, and more particularly to an insulated wire having lubricity on the surface, a manufacturing method thereof, and a paint for forming a baked coating film used therefor.
[0002]
[Prior art]
In recent years, when manufacturing coils for electric devices such as motors, transformers, and deflection yokes, high-speed automatic winding machines are used to coil insulated wires at high speed and high density. For this reason, the insulated wire used for the above-mentioned applications can be coiled at a high density without damaging the insulation film on the surface or deteriorating the insulation characteristics even when the coil is wound at a high speed. In order to increase the conductor space factor in the coil, there is a strong demand for improving the slipperiness of the coating surface.
[0003]
In addition, a so-called self-bonding insulated wire in which a fusion film is applied and baked on a conductor via an insulation film is obtained by dissolving or swelling the fusion film by heating or solvent treatment after coil winding. Since they can be fused and solidified together, a self-supporting coil can be easily produced, and is widely used for coil windings having complicated shapes. However, the fusion film of this self-bonding insulated wire has been studied in the direction of increasing the adhesive force, and it is inferior to the surface slipperiness, that is, the slipperiness of the film surface, and the releasability from the winding die. There are bad drawbacks. Furthermore, when used as a deflection yoke, in order to improve the image characteristics, it is indispensable to make the shape of the coil and the outer diameter uniform, but for this purpose, the slip of the surface of the self-bonding insulated wire is required. It is essential to improve and equalize the properties.
[0004]
In order to solve these problems, means for improving the slipperiness of the surface of the electric wire by applying lubricity to the outermost layer film of the insulated electric wire is employed. As the method, for example, there is a method of adding a lubricant to the paint for forming a baked coating film as the outermost layer, or applying a lubricant to the surface of the paint after baking.
[0005]
Additive lubricants for the former paint for forming a baked coating include waxes such as montanic acid wax, carnauba wax and paraffin wax, lubricating oils such as silicone oil, synthetic resin powders such as fluororesin, polyethylene and polypropylene, etc. It is used. As the latter coating type lubricant, liquid paraffin, a spindle, or a solution obtained by dissolving or dispersing solid paraffin or wax in an organic solvent is used.
[0006]
[Problems to be solved by the invention]
However, the conventional method as described above has the following problems. In other words, in the case of the former additive-type lubricant, in order to improve the slipperiness of the surface of the insulated wire, a large amount of a slipping material must be blended in the paint, so that the film is devitrified or the paint is separated. There is a risk of causing precipitation, and sufficient slipperiness cannot be obtained. Further, when the boiling point of the lubricant is close to the boiling point of the solvent of the paint, it is volatilized when the paint is baked and dried. In some cases, it hardly remains in the film, and the effect of improving the sliding property cannot be exhibited. In the case of the latter application type lubricant, since it is applied after baking the paint, an extra step of applying the lubricant is necessary, and furthermore, it is difficult to apply the lubricant uniformly on the surface of the film and stable slipperiness. There is a problem that it is difficult to obtain. In addition, when a part of the surface baked film is damaged, or when used as a self-bonding wire, an adhesion failure occurs due to excessive lubricant in the bonding process after the winding process, and contamination accidents due to lubricant scattering often occur. It is done.
[0007]
In order to solve these problems, for example, JP-A-1-27113 discloses a method of adding a polyhydric alcohol ester compound of a fatty acid to a fusion coating. However, in this method, the static friction coefficient of the obtained self-bonding insulated wire is at least about 0.06. However, when the coefficient of static friction is 0.06 or more, the sliding property is not sufficient, and there is a problem that coil winding becomes difficult unless another lubricant such as a surface coating agent is used in combination.
[0008]
Therefore, in view of the above points, the present invention can improve and stabilize the surface slipperiness of an insulated wire, and can coil the insulated wire at high speed and high density, and can be used as a self-bonding insulated wire. Insulated wire with surface lubricity that can stabilize the shape and outer diameter of the coil formed without deteriorating self-bonding properties and mold releasability It is something to be done.
[0009]
[Means for Solving the Problems]
In order to solve the above-mentioned object, an insulated wire having surface lubricity according to the present invention is an insulated wire in which lubricity is imparted to the surface by adding a lubricant to the outermost layer coating baking coating, By using a lubricant having a specific composition, the above-mentioned problems are solved. That is, the insulated wire having surface lubricity according to the present invention uses, as a lubricant, an ester reaction product of at least one of pentaerythritol or dipentaerythritol and at least one saturated fatty acid having 10 to 14 carbon atoms in the molecule, The coating for forming a baking film containing 0.5 to 10.0 parts by weight with respect to 100 parts by weight of the resin in the paint is applied and baked on the conductor directly or through another insulating layer to form the outermost layer. The insulated wire is formed by forming a lubricating film, and the coefficient of static friction of the lubricating film is in the range of 0.02 to 0.05 at a load of 200 g.
[0010]
As described above, by adding the ester reaction product as a lubricant to 0.5 to 10.0 parts by weight with respect to 100 parts by weight of the resin in the paint for forming a baked coating film, the load is 200 g. In this case, it is possible to obtain an insulating wire having a good sliding property with a surface static friction coefficient of 0.02 to 0.05. When the amount of the ester reaction product is less than 0.5 parts by weight, there is no effect as a lubricant. On the other hand, if it exceeds 10.0 parts by weight, the slipping property tends to decrease. More preferably, the amount of the ester reaction product added to the paint is in the range of 1.0 to 5.0 parts by weight with respect to 100 parts by weight of the resin content in the paint.
[0011]
The saturated fatty acid is a long chain fatty acid having 10 to 14 carbon atoms. When the carbon number is 9 or less or 15 or more, the static friction coefficient of the surface is 0.06 or more, and the slipperiness is poor.
[0012]
Further, when the number of saturated fatty acid groups in the molecule in the ester reaction product is 2 or less, the slipping property tends to be deteriorated. For this reason, the number of fatty acid groups in the molecule of the ester reaction product is preferably 3 or more.
[0013]
The reason why the ester reactant used as an additive lubricant in the present invention exhibits excellent lubricity is not necessarily clear, but the ester reactant is a solvent that is generally used for a paint for forming a baked coating film. Since it is soluble and dissolves uniformly in the paint, as the solvent in the paint evaporates during the baking process, the ester reactant that can no longer dissolve in the paint is stably transferred to the surface of the film. This is considered to be because the methylene group having a long molecular chain is arranged outwardly at the stage of diffusion migration and a film is formed to provide an excellent lubricating function.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Examples of the paint for forming a baked coating film used in the present invention include those obtained by dissolving a resin such as polyvinyl formal, polyurethane, polyester, polyesterimide, polyamideimide, polyamide, and epoxy in an organic solvent. Although the present invention is not limited to the resin, the effect of the present invention is most remarkable when the outermost layer is a self-bonding insulated wire having a self-bonding layer. It is more preferable to use a fusible paint obtained by dissolving a polyamide resin, which is the most common and widely used as a resin, in an organic solvent.
[0015]
As the organic solvent obtained by dissolving the resin together with the lubricant composed of the ester reaction product, any of these good solvents can be used, for example, cresol, phenol, xylenol, N, N-dimethylformamide. , N, N-dimethylacetamide, N-methylpyrrolidone and the like, and these can be used alone or in combination of two or more. If necessary, a poor solvent such as solvent naphtha and xylene can be used in combination with the above good solvent.
[0016]
The ester reactant used as a lubricant in the present invention can be easily synthesized from pentaerythritol, dipentaerythritol or a mixture thereof and a saturated long chain fatty acid.
[0017]
Specific examples of the saturated fatty acid include decanoic acid, undecanoic acid, dodecanoic acid, tridecanoic acid, and tetradecanoic acid.
[0018]
Examples of the ester reaction product synthesized from the above pentaerythritol, dipentaerythritol, or a mixture thereof and a saturated long-chain fatty acid include the following.
[0019]
A tetraester of pentaerythritol represented by the following structural formula (1).
[0020]
[Chemical 7]

[0021]
[Wherein R is a saturated fatty acid group represented by —CO—C _n H _{2n + 1} (where n is an integer of 9 to 13), and they are not necessarily the same. ]
[0022]
Triester of pentaerythritol represented by the following structural formula (2).
[0023]
[Chemical 8]

[0024]
[Wherein R is a saturated fatty acid group represented by —CO—C _n H _{2n + 1} (where n is an integer of 9 to 13), and they are not necessarily the same. ]
[0025]
Hexaester of dipentaerythritol represented by the following structural formula (3).
[0026]
[Chemical 9]

[0027]
[Wherein R ^{1 to} R ⁶ are saturated fatty acid groups represented by —CO—C _n H _{2n + 1} (where n is an integer of 9 to 13), and they are not necessarily the same. ]
[0028]
A pentaester of dipentaerythritol represented by the following structural formula (4).
[0029]
[Chemical Formula 10]

[In the formula, any one of R ^{1 to} R ⁶ is —H, and the remaining five are saturated fatty acid groups represented by —CO—C _n H _{2n + 1} (where n is an integer of 9 to 13). And they need not be the same. ]
[0030]
A tetraester of dipentaerythritol represented by the following structural formula (5).
[0031]
Embedded image

[0032]
[In the formula, any two of R ^{1 to} R ⁶ are —H, and the remaining four are saturated fatty acid groups represented by —CO—C _n H _{2n + 1} (where n is an integer of 9 to 13). And they need not be the same. ]
[0033]
Triester of dipentaerythritol represented by the following structural formula (6).
[0034]
Embedded image

[0035]
[In the formula, any three of R ^{1 to} R ⁶ are —H, and the remaining three are —CO—C _n H _{2n + 1} (where n is an integer of 9 to 13). And they need not be the same. ]
[0036]
Among these, pentaerythritol tetradodecanoate, pentaerythritol tetradecanoate, pentaerythritol tetratetradecanoate, dipentaerythritol hexadodecanoate and the like are preferable, and among them, pentaerythritol tetradodecanoate is preferably synthesized. It is particularly preferable because it is simple, easily available, and inexpensive.
[0037]
【Example】
(Example 1)
In a 2 liter four-necked flask equipped with a stirrer and thermometer, 180 g of polyamide resin A (Daiamide 451; manufactured by Daicel Huls), 504 g of cresol, 216 g of xylene, and lubricant C (pentaerythritol tetradodecanoate) 5.4 g (3 parts by weight with respect to 100 parts by weight of the polyamide resin A) was added and stirred at a temperature of about 50 ° C. to obtain a fusible paint. This fusible paint is coated on a polyesterimide insulated wire with a conductor length of 0.25 mm and a finished outer diameter of 0.29 mm under conditions of a furnace length of 3.0 m, furnace temperature of 300 ° C., and linear velocity of 36 m / min. The coating and baking were repeated three times to obtain a self-bonding insulated wire having a baking film thickness of 10 μm.
[0038]
(Example 2)
Polyesterimide insulation was performed in the same manner as in Example 1 except that the amount of lubricant C added was 0.9 g (0.5 parts by weight with respect to 100 parts by weight of the polyamide resin). It was applied and baked onto the electric wire to obtain a self-bonding insulated electric wire having a baking film thickness of 10 μm.
[0039]
(Example 3)
Except that the polyamide resin was polyamide resin B (Platabond M1276; manufactured by Nippon Rilsan Co., Ltd.), the same fusion coating as in Example 1 was applied and baked onto the polyesterimide insulated wire in the same manner as in Example 1 to obtain a baked film thickness. A self-bonding insulated wire having a thickness of 10 μm was obtained.
[0040]
(Example 4)
Except for using lubricant D (pentaerythritol tetratetradecanoate) as the lubricant, the same fusion coating as in Example 1 was applied and baked onto the polyesterimide insulated wire in the same manner as in Example 1, and the thickness of the baked film was 10 μm. A self-bonding insulated wire was obtained.
[0041]
(Example 5)
Except for using lubricant E (pentaerythritol tetradecanoate) as the lubricant, the same fusion coating as in Example 1 was applied and baked onto the polyesterimide insulated wire in the same manner as in Example 1, and the baking film thickness was 10 μm. A self-bonding insulated wire was obtained.
[0042]
(Example 6)
Except for using the lubricant F (dipentaerythritol hexadodecanoate) as the lubricant, the same fusion coating as in Example 1 was applied and baked onto the polyesterimide insulated wire in the same manner as in Example 1, and the thickness of the baked film was 10 μm. A self-bonding insulated wire was obtained.
[0043]
(Comparative Example 1)
Except that the lubricant was not added, the same fusion paint as in Example 1 was applied and baked onto the polyesterimide insulated wire in the same manner as in Example 1 to obtain a self-fusing insulated wire having a baking film thickness of 10 μm. It was.
[0044]
(Comparative Example 2)
Except that the lubricant was Lubricant G (Hoechst E; manufactured by Hoechst Japan Co., Ltd.), the same fusion coating as in Example 1 was applied and baked onto the polyesterimide insulated wire in the same manner as in Example 1, and the thickness of the baked film A 10 μm self-bonding insulated wire was obtained.
[0045]
(Comparative Example 3)
Except that the lubricant was Lubricant H (Hostalb WE4; manufactured by Hoechst Japan), the same fusion coating as in Example 1 was applied and baked onto the polyesterimide insulated wire in the same manner as in Example 1, and the thickness of the baked film A 10 μm self-bonding insulated wire was obtained.
[0046]
(Comparative Example 4)
Except that the lubricant is lubricant I (polyethylene powder), a fusion coating similar to that of Example 1 is applied and baked onto a polyesterimide insulated wire in the same manner as in Example 1, and self-adhesive with a baking film thickness of 10 μm. An insulated wire was obtained.
[0047]
(Comparative Example 5)
Except that the lubricant was lubricant J (pentaerythritol tetraoctadecanoate), the same fusion paint as in Example 1 was applied and baked on the polyesterimide insulated wire in the same manner as in Example 1, and the thickness of the baked film was 10 μm. A self-bonding insulated wire was obtained.
[0048]
(Comparative Example 6)
Except for using lubricant K (pentaerythritol tetraoctanoate) as the lubricant, the same fusion coating as in Example 1 was applied and baked onto the polyesterimide insulated wire in the same manner as in Example 1, and the baking film thickness was 10 μm. A self-bonding insulated wire was obtained.
[0049]
The appearance, dielectric breakdown voltage, and static friction coefficient were evaluated as the characteristics of the self-bonding insulated wires obtained in the above examples and comparative examples, and the adhesiveness and mold releasability were evaluated as the coil characteristics. These results are shown in Table 1 below together with the blending conditions of the fusible paint used.
[0050]
In addition, about the dielectric breakdown voltage, it carried out according to the enamel copper wire and enamel aluminum wire test method of JISC3003. The coefficient of static friction is determined by placing two test pieces in parallel on a slide that is kept horizontal, and two pieces of the same test piece in parallel on a slider with a load of 200 g, and then on the test piece on the slide and on the slider. Place the test piece in a fixed position so that it goes straight, and from this state, after tilting the slide stand by 1 scale (tanzent scale 0.01), give vibration 3 times for about 1 second, and repeat this until the slider starts to slide, It was measured from the angle of the slide when the slider started to slide. Furthermore, with regard to mold releasability, when a deflection yoke coil is created by winding the obtained self-bonding insulated wire with a deflection yoke coil winding machine, after energization heating, press cooling, from the mold When the coil was taken out, the case where there was a part where the mold and the coil were bonded was judged as bad, and the case where it was not good was judged as good. Regarding the adhesiveness, the fusion force of the inner portion 1 and 2 turns of the deflection yoke coil after molding is measured with a tension gauge, and when the average value of the fusion force is 300 g or more, it is good, and when it is less than that, it is bad. did.
[0051]
[Table 1]

[0052]
【The invention's effect】
From the above results, it can be seen that the insulated wire of the present invention has excellent insulation characteristics and excellent surface slipperiness. Therefore, when the insulated wire having surface lubricity according to the present invention is used, there is no damage to the film and poor insulation at high speed and high density winding, and even when used as a self-bonding insulated wire, the surface is slippery. Because it is good, the shape and outer diameter of the coil is stable, the releasability from the winding die is good, and there is no adhesion failure, so the productivity of coils such as deflection yokes Will improve.

Claims

The outermost layer is applied and baked with a paint for baking coating film containing an ester reaction product of at least one of pentaerythritol or dipentaerythritol and at least one saturated fatty acid having 10 to 14 carbon atoms,
Two test pieces are stretched in parallel on a slide that is kept horizontal, and after two of the same test pieces are stretched in parallel on a slider with a load of 200 g, the test piece on the slide and the test piece on the slider are perpendicular In this position, place the slide on one scale (tanzent scale) 0.01) After stopping the tilting, a vibration was given about 3 times per second, and this was repeated until the slider started to slide . The static friction coefficient of the surface measured from the angle of the slide when the slider started to slide was 0 . A seizure film in the range of 02 to 0.05 is formed.
An insulated wire having surface lubricity characterized by the above.

The insulated wire according to claim 1, wherein the content of the ester reaction product is 0.5 to 10 parts by weight with respect to 100 parts by weight of the resin content in the paint for forming a baked coating film.

The insulated wire according to claim 1, wherein the number of saturated fatty acid groups in the molecule of the ester reactant is 3 or more.

The insulated wire according to claim 1, wherein the ester reaction product is a tetraester of pentaerythritol represented by the following structural formula.

[Wherein R is a saturated fatty acid group represented by —CO—C _n H _{2n + 1} (where n is an integer of 9 to 13), and they are not necessarily the same. ]

The insulated wire according to claim 4, wherein the tetraester of pentaerythritol is at least one selected from the group consisting of pentaerythritol tetradodecanoate, pentaerythritol tetradecanoate, and pentaerythritol tetratetradecanoate.

The insulated wire according to claim 1, wherein the ester reaction product is a hexaester of dipentaerythritol represented by the following structural formula.

[Wherein R ^{1 to} R ⁶ are saturated fatty acid groups represented by —CO—C _n H _{2n + 1} (where n is an integer of 9 to 13), and they are not necessarily the same. ]

The insulated wire according to claim 6, wherein the hexaester of dipentaerythritol is dipentaerythritol hexadodecanoate.

2. The insulated wire according to claim 1, wherein the paint for forming a baked coating film is a fusible paint mainly composed of a thermoplastic resin.

The insulated wire according to claim 8, wherein the thermoplastic resin is a polyamide resin.

A coating for forming a baked coating film to which an ester reaction product of at least one of pentaerythritol or dipentaerythritol and at least one saturated fatty acid having 10 to 14 carbon atoms is added directly on the conductor or other insulating layer A method for producing an insulated wire having surface lubricity, characterized by being coated and baked through a wire.

The method for producing an insulated wire according to claim 10, wherein the addition amount of the ester reactant is 0.5 to 10 parts by weight with respect to 100 parts by weight of the resin in the paint for forming a baking coating film.

The method for producing an insulated wire according to claim 10, wherein the number of saturated fatty acid groups in the ester reaction product is 3 or more.

The method for producing an insulated wire according to claim 10, wherein the ester reactant is a tetraester of pentaerythritol represented by the following structural formula.

The method for producing an insulated wire according to claim 13, wherein the tetraester of pentaerythritol is at least one selected from the group consisting of pentaerythritol tetradodecanoate, pentaerythritol tetradecanoate, and pentaerythritol tetratetradecanoate. .

The method for producing an insulated wire according to claim 10, wherein the ester reaction product is a hexaester of dipentaerythritol represented by the following structural formula.

The method for manufacturing an insulated wire according to claim 15, wherein the hexaester of dipentaerythritol is dipentaerythritol hexadodecanoate.

The method for manufacturing an insulated wire according to claim 10, wherein the paint for forming a baked coating film is a fusible paint mainly composed of a thermoplastic resin.

The method for manufacturing an insulated wire according to claim 17, wherein the thermoplastic resin is a polyamide resin .

A paint for forming a baked coating film of an insulated wire, comprising an ester reaction product of at least one of pentaerythritol or dipentaerythritol and at least one saturated fatty acid having 10 to 14 carbon atoms.

The paint for baking coating film formation according to claim 19, wherein the content of the ester reaction product is 0.5 to 10 parts by weight with respect to 100 parts by weight of the resin content in the paint.

20. The baking coating film-forming paint according to claim 19, wherein the number of saturated fatty acid groups in the ester reaction product is 3 or more.

The paint for baking coating film according to claim 19, wherein the ester reaction product is a tetraester of pentaerythritol represented by the following structural formula.

23. For baking film formation according to claim 22, wherein the tetraester of pentaerythritol is at least one selected from the group consisting of pentaerythritol tetradodecanoate, pentaerythritol tetradecanoate, and pentaerythritol tetratetradecanoate. paint.

The paint for baking coating film according to claim 19, wherein the ester reaction product is a hexaester of dipentaerythritol represented by the following structural formula.

25. The paint for forming a baking coating film according to claim 24, wherein the hexaester of dipentaerythritol is dipentaerythritol hexadodecanoate.

20. The paint for forming a baked coating film according to claim 19, wherein the paint is a fusible paint mainly composed of a thermoplastic resin.

27. The paint for forming a baked coating film according to claim 26, wherein the thermoplastic resin is a polyamide resin.