JP2571483B2 - Method for forming a conductive layer on an epoxy resin insulating molded article - Google Patents
Method for forming a conductive layer on an epoxy resin insulating molded articleInfo
- Publication number
- JP2571483B2 JP2571483B2 JP3285553A JP28555391A JP2571483B2 JP 2571483 B2 JP2571483 B2 JP 2571483B2 JP 3285553 A JP3285553 A JP 3285553A JP 28555391 A JP28555391 A JP 28555391A JP 2571483 B2 JP2571483 B2 JP 2571483B2
- Authority
- JP
- Japan
- Prior art keywords
- epoxy resin
- paint
- insulator
- insulating
- 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 - Lifetime
Links
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- Insulating Bodies (AREA)
- Processing Of Terminals (AREA)
- Cable Accessories (AREA)
Description
【0001】[0001]
【産業上の利用分野】本発明はエポキシ樹脂組成物によ
り成形した絶縁体表面に導電性層を形成する方法に関す
るものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a conductive layer on the surface of an insulator formed of an epoxy resin composition.
【0002】[0002]
【従来の技術】エポキシ樹脂組成物においては、その優
れた電気的強度、機械的強度、成形性等のために碍管等
の絶縁体の成形に使用されている。2. Description of the Related Art Epoxy resin compositions are used for molding insulators such as porcelain tubes because of their excellent electrical strength, mechanical strength and moldability.
【0003】このエポキシ樹脂組成物においては、熱膨
張収縮率、機械的強度、電気特性、耐熱性等の諸特性の
向上、コストの低減等のために無機質充填材を添加する
ことが多い。[0003] In this epoxy resin composition, an inorganic filler is often added to improve various properties such as thermal expansion / shrinkage rate, mechanical strength, electric properties, heat resistance, etc., and reduce costs.
【0004】上記碍管等の電気絶縁体においては、電界
分布状態の如何によっては、当該絶縁体に作用する電界
分布を調整し、電気ストレスを緩和して電気的強度の向
上を図らなければならないことがある。In an electric insulator such as the above-mentioned porcelain tube, depending on the state of electric field distribution, it is necessary to adjust the electric field distribution acting on the insulator to reduce electric stress and to improve electric strength. There is.
【0005】上記エポキシ樹脂組成物を用いて絶縁体を
成形する場合、通常、注型法を使用している。かかる注
型法ではバリの発生を伴い、このバリ取りのための研削
加工が必要である。また、成形時でのエポキシ樹脂の硬
化収縮、熱収縮による寸法変形に対処するために、成形
後、切削加工により寸法出しを行なわなければならない
こともある。[0005] When molding an insulator using the epoxy resin composition, a casting method is usually used. In such a casting method, burrs are generated, and grinding for removing the burrs is required. Further, in order to cope with dimensional deformation due to curing shrinkage and heat shrinkage of the epoxy resin during molding, it may be necessary to perform dimensioning by cutting after molding.
【0006】従来、エポキシ樹脂成形絶縁体に作用する
電界分布を調整し、電気ストレスを緩和して電気的強度
を向上させるために、絶縁体表面の所定の部位に導電性
塗料を塗布して電極層を形成することが公知である。[0006] Conventionally, in order to adjust the electric field distribution acting on the epoxy resin molded insulator, to reduce the electric stress and to improve the electric strength, a predetermined portion of the surface of the insulator is coated with a conductive paint to form an electrode. It is known to form layers.
【0007】通常、上記電界分布調整電極層と絶縁体と
の界面には、相当に高い電気ストレスが作用し、その界
面が剥離すれば、その界面剥離箇所が電気的弱点とな
り、絶縁破壊がその剥離箇所を起点として進展し、かえ
って電気的強度の低下が惹起されることはよく知られて
いる。Normally, a considerably high electric stress acts on the interface between the electric field distribution adjusting electrode layer and the insulator, and when the interface is separated, the portion where the interface is separated becomes an electrical weak point, and the dielectric breakdown causes the dielectric breakdown. It is well known that the film develops from the peeling point and causes a decrease in electric strength.
【0008】このため、電界分布調整電極層と絶縁体と
の界面の接着の安定化、乃至は接着強度アップの重要性
が広く認識されている。例えば、絶縁体がフッ素樹脂の
ような難接着性樹脂から成形されている場合、当該絶縁
体と電界分布調整電極層との接着強化のために、絶縁体
表面に接着性向上のための下地処理を施すことが提案さ
れている。For this reason, the importance of stabilizing the bonding at the interface between the electric field distribution adjusting electrode layer and the insulator or increasing the bonding strength is widely recognized. For example, when the insulator is formed from a hardly-adhesive resin such as a fluororesin, the surface of the insulator is subjected to a base treatment for improving the adhesion in order to strengthen the adhesion between the insulator and the electric field distribution adjusting electrode layer. It has been proposed to apply
【0009】しかしながら、エポキシ樹脂においては、
極めて優れた接着性を有し、導電性塗料の塗布により設
けた電界分布調整電極層と絶縁体との間の接着強度が強
固であり、エポキシ樹脂成形絶縁体と電界分布調整電極
層との界面状態が原因で絶縁体の電気的強度の減退が招
来されることは通常、想定されない。However, in epoxy resins,
It has extremely good adhesion, strong adhesion between the electric field distribution adjusting electrode layer provided by applying the conductive paint and the insulator, and the interface between the epoxy resin molded insulator and the electric field distribution adjusting electrode layer. It is not normally assumed that the condition will cause a decrease in the electrical strength of the insulator.
【0010】[0010]
【発明が解決しようとする課題】ところで、エポキシ樹
脂成形絶縁体に導電性塗料の塗布により電極層を形成す
るには、上記した寸法精度、バリ取り等の処理上、切削
面乃至は研削面上に導電性塗料を塗布しなければならな
い。By the way, in order to form an electrode layer by applying a conductive paint to an epoxy resin molded insulator, the above-described processing such as dimensional accuracy, deburring, etc., and a cut surface or a ground surface are required. Must be coated with a conductive paint.
【0011】而るに、本発明者等においては、切削面乃
至は研削面に絶縁塗料の下塗を施したうえで、導電性塗
料を塗布すると、下塗を施すことなく導電性塗料を直接
切削面乃至は研削面に塗布する場合に較べ、絶縁体の電
気的強度を飛躍的に向上できることを実験的に知得し
た。[0011] The inventors of the present invention, however, apply a conductive paint to a cutting surface or a ground surface after applying an undercoat of an insulating paint, and then directly apply the conductive paint to the cutting surface without applying an undercoat. In addition, it has been experimentally found that the electric strength of the insulator can be remarkably improved as compared with the case of coating on a ground surface.
【0012】本発明者等においては、この理由を解明す
るために種々実験を行なったところ、エポキシ樹脂に添
加した無機質充填材(大きいもので、0.1mm程度)
に、その脆性のために絶縁体の切削面乃至は研削面にお
いてヘァークラックが生じ、または、同無機質充填材が
切削面乃至は研削面において欠け、脱落して0.01m
mオーダの尖鋭凹部が生じていることをSEMにより観
察し、このヘァークラック、尖鋭凹部に導電性塗料が侵
入して電極針が形成されることが原因であると推察し得
るに至った。The present inventors conducted various experiments in order to elucidate the reason, and found that the inorganic filler added to the epoxy resin (large, about 0.1 mm ).
In addition, due to its brittleness, hard cracks occur on the cut surface or ground surface of the insulator, or the inorganic filler is chipped on the cut surface or ground surface and falls off by 0.01 m.
It was observed by SEM that a sharp concave portion of the order of m was generated, and it could be inferred that the cause was that the conductive paint entered the hard crack and the sharp concave portion to form an electrode needle.
【0013】上記のように、エポキシ樹脂成形絶縁体に
おいては、その優れた接着性のために電界分布調整電極
層を強固に固着し得ても、その電界分布調整電極層を絶
縁体の切削面乃至は研削面に導電性塗料を塗布すること
によって形成する以上、無機質充填材の当該切削面乃至
は研削面でのヘァ−クラック等への導電性塗料の侵入に
よる電気ストレス集中部位(電極針)の生成があり、電
界分布調整電極層と絶縁体との接着強化のみでは、使用
電圧の高圧化に適正に対処し難い。As described above, in the epoxy resin molded insulator, even if the electric field distribution adjusting electrode layer can be firmly fixed due to its excellent adhesiveness, the electric field distribution adjusting electrode layer can be fixed to the cut surface of the insulator. Or by applying a conductive paint on the ground surface, the concentration of electric stress (electrode needle) due to intrusion of the conductive paint into the cracks or the like on the cut surface or the ground surface of the inorganic filler. Therefore, it is difficult to properly cope with an increase in the working voltage only by strengthening the adhesion between the electric field distribution adjusting electrode layer and the insulator.
【0014】本発明の目的は、上記の知見に基づき、無
機質充填材を添加したエポキシ樹脂組成物の成形絶縁体
と電界分布調整電極層との界面の電気的強度を強化して
エポキシ樹脂組成物絶縁成形体に電界分布調整電極層を
形成できる方法を提供することにある。An object of the present invention is to provide an epoxy resin composition by strengthening the electric strength at the interface between a molded insulator of an epoxy resin composition containing an inorganic filler and an electric field distribution adjusting electrode layer based on the above findings. An object of the present invention is to provide a method capable of forming an electric field distribution adjusting electrode layer on an insulating molded body.
【0015】[0015]
【課題を解決するための手段】本発明のエポキシ樹脂絶
縁成形体に導電性層を形成する方法は、無機質充填材を
添加したエポキシ樹脂組成物により成形した絶縁体の所
定の外面を切削または研削により加工し、その加工面に
絶縁塗料を塗布し、その塗布面上に導電性塗料を塗布す
ることを特徴とする構成である。The method for forming a conductive layer on an epoxy resin insulating molded article according to the present invention comprises cutting or grinding a predetermined outer surface of an insulator molded from an epoxy resin composition to which an inorganic filler has been added. , An insulating paint is applied to the processed surface, and a conductive paint is applied to the applied surface.
【0016】[0016]
【作用】絶縁体表面の切削乃至は研削加工時に生じた無
機質充填材のヘァ−クラックまたは、無機質充填材の欠
け、脱落跡の尖鋭な凹部が絶縁塗料で埋められてしま
い、その上に、導電性塗料が塗布される。従って、導電
性塗料のヘァ−クラックまたは、尖鋭な凹部への侵入を
防止でき、電極針の生成を排除でき、電気針での電気ス
トレス集中に起因する電気破壊を回避できる。The insulating filler has a crack formed on the surface of the insulator or a crack formed on the surface of the insulating filler during chipping or grinding. A paint is applied. Accordingly, it is possible to prevent the conductive paint from penetrating into a hair crack or a sharp concave portion, to eliminate generation of an electrode needle, and to avoid electric breakdown due to concentration of electric stress at the electric needle.
【0017】[0017]
【実施例】以下、図面により本発明の実施例を説明す
る。図1はケーブル端末に装着して使用する絶縁補強体
を示し、1はエポキシ樹脂絶縁成形体を、2は絶縁塗料
の塗布層を、3は導電性塗料の塗布により形成した電界
分布調整用ベルマウス電極をそれぞれ示している。Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an insulation reinforcing body used by attaching to a cable terminal, 1 is an epoxy resin insulation molding, and 2 is an insulating paint.
Of a coating layer, 3 indicates an electric field distribution adjusting bellmouth electrodes formed by coating a conductive paint, respectively.
【0018】このエポキシ樹脂絶縁成形体は、例えばシ
リカ粉末を添加したエポキシ樹脂組成物の注型により成
形し、ベルマウス面11を含め全体を切削加工してあ
る。This epoxy resin insulating molded body is molded by casting an epoxy resin composition to which, for example, silica powder has been added, and the entire body including the bell mouth surface 11 is cut.
【0019】本発明により電界分布調整用ベルマウス電
極3を形成するには、まず、ベルマウス面11に絶縁塗
料を塗布し、上記の切削加工時に無機質充填材に生じた
ヘァ−クラック、無機質充填材の欠け、脱落跡の尖鋭な
凹部を絶縁塗料で埋め、この塗料の固化後、その塗膜上
に導電性塗料を塗布する。In order to form the bell mouth electrode 3 for adjusting the electric field distribution according to the present invention, first, an insulating paint is applied to the bell mouth surface 11, and hair cracks and inorganic filling generated in the inorganic filler during the above-mentioned cutting process. The sharp recesses of the chipped or dropped material are filled with an insulating paint, and after the paint is solidified, a conductive paint is applied on the paint film.
【0020】上記絶縁塗料には、上記エポキシ樹脂組成
物と同レベルの絶縁性能を有する充填材無添加の液状樹
脂、または、溶剤希釈樹脂を使用することが好ましい。It is preferable to use a filler-free liquid resin or a solvent-diluted resin having the same level of insulating performance as the epoxy resin composition for the insulating coating.
【0021】上記導電性塗料の塗布は、上記ベルマウス
面に塗布した絶縁塗料が充分に固化したのちであって、
導電性塗料に溶け込ませないようにして行なう。The conductive paint is applied after the insulating paint applied to the bellmouth surface is sufficiently solidified.
This is performed so as not to dissolve in the conductive paint.
【0022】本発明によれば、エポキシ樹脂組成物で成
形した成形絶縁体の切削面または研削面での無機質充填
材のヘァ−クラック又は無機質充填材の欠け、脱落跡が
絶縁塗料で埋められたうえで、導電性塗料の塗布により
ベルマウス電極層が設けられるから、上記ヘア−クラッ
ク等への導電性塗料の侵入による電極針の形成を排除で
き、エポキシ樹脂絶縁成形体の絶縁強度をよく向上でき
る。このことは次ぎの実施例品と比較例品との耐圧試験
結果からも明らかである。According to the present invention, the hair crack of the inorganic filler or the chipping or falling off of the inorganic filler on the cut surface or the ground surface of the molded insulator molded with the epoxy resin composition is filled with the insulating paint. In addition, since the bellmouth electrode layer is provided by applying a conductive paint, the formation of electrode needles due to the penetration of the conductive paint into the hair cracks and the like can be eliminated, and the insulation strength of the epoxy resin insulating molded body is improved well. it can. This is also evident from the results of the pressure test of the following examples and comparative examples.
【0023】実施例1 エポキシ樹脂組成物には、ビスフェノ−ル系エポキシ樹
脂(100重量部)、酸系硬化剤(20重量部)にシリ
カ粉(200重量部)を充填材として添加したものを使
用し、図2に示すように導体棒4上に上記エポキシ樹脂
組成物を注型し、その中央部を曲面11状に切削加工し
た(t:3mm,I1:100mm,I2:60mm)。常温液状
ビスフェノ−ル系エポキシ樹脂常温硬化タイプアラルダ
イトAY103:100部とHY956:18部とを2
0%のケトン系有機溶剤で希釈して得た絶縁塗料(充填
材無添加)を切削加工面に塗布し、この塗布層を60
℃,3時間で硬化させ、この硬化層2上に導電性塗料を
塗布して電極層3を形成した。Example 1 An epoxy resin composition was prepared by adding a silica powder (200 parts by weight) to a bisphenol-based epoxy resin (100 parts by weight) and an acid-based curing agent (20 parts by weight) as a filler. As shown in FIG. 2, the above-mentioned epoxy resin composition was cast on the conductor rod 4 and the center portion was cut into a curved surface 11 (t: 3 mm, I 1 : 100 mm, I 2 : 60 mm). . Room temperature liquid bisphenol-based epoxy resin Room temperature curing type Araldite AY103: 100 parts and HY956: 18 parts
An insulating paint (no filler added) obtained by diluting with a 0% ketone-based organic solvent is applied to the cut surface, and this applied layer is
The composition was cured at 3 ° C. for 3 hours, and a conductive paint was applied on the cured layer 2 to form an electrode layer 3.
【0024】実施例2 実施例1に対し、絶縁塗料として常温硬化ポリウレタン
リクア塗料(充填材無添加)を使用し、この塗料の塗布
層を80℃,3時間で硬化させた。これ以外は実施例1
に同じとした。Example 2 In contrast to Example 1, a room temperature-cured polyurethane liquid paint (no filler added) was used as an insulating paint, and the coating layer of this paint was cured at 80 ° C. for 3 hours. Other than this, Example 1
And the same.
【0025】実施例3 実施例1に対し、絶縁塗料として、ビスフェノ−ル型エ
ポキシ樹脂(エピコ−ト1004):160部とレゾ−
ル型キシレンフェノ−ル樹脂:160部とをセルソルブ
アセテ−ト:100部とキシレン:120部とブタノ−
ル:60部とで溶解して得た絶縁塗料(充填材無添加)
を使用し、この塗料の塗布層を120℃,3時間で硬化
させた。これ以外は実施例1に同じとした。Example 3 In contrast to Example 1, bisphenol type epoxy resin (Epicoat 1004): 160 parts and a resin were used as insulating coatings.
Xylene phenol resin: 160 parts with cellosolve acetate: 100 parts, xylene: 120 parts with butanol
: Insulating paint obtained by dissolving with 60 parts (no filler added)
The coating layer of this paint was cured at 120 ° C. for 3 hours. Except for this, it was the same as Example 1.
【0026】比較例 実施例1において、絶縁塗料の塗布を省略し、切削加工
面に導電性塗料を直接塗布した。これ以外は実施例1に
同じとした。Comparative Example In Example 1, the application of the insulating paint was omitted, and the conductive paint was directly applied to the cut surface. Except for this, it was the same as Example 1.
【0027】これらの実施例品並びに比較例品につき、
絶縁油中において10KV/1分ステップアップ法で交
流電圧を課電する交流耐電圧試験並びに負極性20KV
/3回ステップアップ法でインパルス電圧を課電するイ
ンパルス耐電圧試験を行なったところ(試料数はそれぞ
れについて5個)、比較例においては、交流破壊電圧が
平均100KV,インパルス破壊電圧が196KVに過
ぎなかったが、実施例品においては、交流破壊電圧が平
均120KV以上(実施例1:平均134KV,実施例
2:平均124KV,実施例3:平均126KV)であ
り、インパルス破壊電圧が250KV以上(実施例1:
平均257KV,実施例2:平均252KV,実施例
3:平均251KV)であって、比較例品よりも一段と
優れていた。なお、各実施例品並びに比較例品につい
て、導電性塗料層を削り、エポキシ樹脂面を表出させ、
SEMにより観察したところ、比較例品ではエポキシ樹
脂の切削加工面のヘァークラック乃至は尖鋭凹部に導電
性塗料が侵入して電極針が形成されいたが、各実施例品
ではヘァークラック乃至は尖鋭凹部が絶縁塗料で埋めら
れて電極針の形成は観られなかった。 従って、絶縁塗料
の代わりに導電性塗料を使用すると、上記耐電圧値は比
較例と実質上変わらないことが明らかである。 With respect to these examples and comparative examples,
AC withstand voltage test to apply AC voltage in insulating oil by 10KV / 1 minute step-up method and negative polarity 20KV
When an impulse withstand voltage test in which an impulse voltage was applied by a step-up method / 3 times was performed (the number of samples was 5 for each), in the comparative example, the AC breakdown voltage was 100 KV on average, and the impulse breakdown voltage was only 196 KV. However, in the example products, the AC breakdown voltage was 120 KV or more on average (Example 1: 134 KV on average, Example 2: 124 KV on average, and Example 3: 126 KV on average), and the impulse breakdown voltage was 250 KV or more (implemented). Example 1:
(Average: 257 KV, Example 2: average 252 KV, Example 3: average 251 KV), which was much better than the comparative example. Note that each of the examples and comparative examples
To remove the conductive paint layer and expose the epoxy resin surface,
Observation by SEM showed that the epoxy resin was
Conduction in hard cracks or sharp recesses on grease-cut surfaces
The electrode needle was formed due to the penetration of the conductive paint.
Then the cracks or sharp recesses are filled with insulating paint
No electrode needle formation was observed. Therefore, insulating paint
When conductive paint is used instead of
It is clear that it is not substantially different from the comparative example.
【0028】[0028]
【発明の効果】本発明のエポキシ樹脂絶縁成形体に導電
性層を形成する方法によれば、導電性塗料の塗布により
電界分布調整電極層を形成する場合、その下地に絶縁塗
料を塗布するだけでエポキシ樹脂絶縁成形体の絶縁強度
を飛躍的に向上でき、切削または研削加工により寸法精
度を保証しつつエポキシ樹脂絶縁成形体の絶縁信頼性の
高揚、縮小化を図ることができる。According to the method for forming a conductive layer on an epoxy resin insulating molded article of the present invention, when an electric field distribution adjusting electrode layer is formed by applying a conductive paint, only an insulating paint is applied to the base. Can dramatically improve the insulation strength of the epoxy resin insulation molded product, and can be precisely dimensioned by cutting or grinding.
It is possible to enhance and reduce the insulation reliability of the epoxy resin insulating molded body while guaranteeing the degree .
【図1】本発明によって電界分布調整電極を形成したエ
ポキシ樹脂成形絶縁体を示す断面図である。FIG. 1 is a sectional view showing an epoxy resin molded insulator on which an electric field distribution adjusting electrode is formed according to the present invention.
【図2】本発明により電界分布調整電極を形成したエポ
キシ樹脂成形絶縁体の耐電圧試験に使用した試料を示す
断面図である。FIG. 2 is a sectional view showing a sample used for a withstand voltage test of an epoxy resin molded insulator on which an electric field distribution adjusting electrode is formed according to the present invention.
1 エポキシ樹脂成形絶縁体 11 切削加工面 2 絶縁塗料塗布層 3 導電性塗料塗布層 DESCRIPTION OF SYMBOLS 1 Epoxy resin molded insulator 11 Cutting surface 2 Insulation paint application layer 3 Conductive paint application layer
Claims (1)
物により成形した絶縁体の所定の外面を切削または研削
により加工し、その加工面に絶縁塗料を塗布し、その塗
布面上に導電性塗料を塗布することを特徴とするエポキ
シ樹脂絶縁成形体に導電性層を形成する方法。An insulator molded from an epoxy resin composition to which an inorganic filler has been added is processed by cutting or grinding a predetermined outer surface, an insulating paint is applied to the worked surface, and a conductive paint is applied on the applied surface. A method for forming a conductive layer on an epoxy resin insulating molded article, characterized by applying a coating.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3285553A JP2571483B2 (en) | 1991-10-04 | 1991-10-04 | Method for forming a conductive layer on an epoxy resin insulating molded article |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3285553A JP2571483B2 (en) | 1991-10-04 | 1991-10-04 | Method for forming a conductive layer on an epoxy resin insulating molded article |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH05101732A JPH05101732A (en) | 1993-04-23 |
JP2571483B2 true JP2571483B2 (en) | 1997-01-16 |
Family
ID=17693035
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3285553A Expired - Lifetime JP2571483B2 (en) | 1991-10-04 | 1991-10-04 | Method for forming a conductive layer on an epoxy resin insulating molded article |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2571483B2 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100483232B1 (en) * | 2002-02-20 | 2005-04-15 | 엘에스전선 주식회사 | The epoxy insulator for cable joint |
CN110459619B (en) * | 2019-06-05 | 2024-07-23 | 南京格兰泽光电科技有限公司 | Selenium antimony sulfide battery pack and preparation method thereof |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS52110768A (en) * | 1976-03-15 | 1977-09-17 | Sumitomo Electric Industries | Epoxy resin cast article |
JPS5471951A (en) * | 1977-11-21 | 1979-06-08 | Agency Of Ind Science & Technol | Binary threshold setting method for picture density |
JPS59224313A (en) * | 1983-06-02 | 1984-12-17 | Origin Electric Co Ltd | Manufacture of moldings |
-
1991
- 1991-10-04 JP JP3285553A patent/JP2571483B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH05101732A (en) | 1993-04-23 |
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