JP2006310205A - Cast article for electric insulation and its manufacturing method - Google Patents
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- JP2006310205A JP2006310205A JP2005133779A JP2005133779A JP2006310205A JP 2006310205 A JP2006310205 A JP 2006310205A JP 2005133779 A JP2005133779 A JP 2005133779A JP 2005133779 A JP2005133779 A JP 2005133779A JP 2006310205 A JP2006310205 A JP 2006310205A
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Abstract
Description
この発明は、電気絶縁用注型品およびその製造方法、特に、金属部品を絶縁体であるエポキシ樹脂中に埋め込んで製作する電気絶縁用注型品およびその製造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 an electrical insulation casting product and a manufacturing method thereof, and more particularly to an electrical insulation casting product manufactured by embedding a metal part in an epoxy resin as an insulator and a manufacturing method thereof.
屋外で使用される電気機器は、季節及び昼夜による気温の変化（温度サイクル）に長期間晒されており、金属部品をエポキシ樹脂中に埋め込んで製作した注型品においては、金属部品とエポキシ樹脂の境界面に両者の線膨張係数の違いに起因する応力が発生する。一般に、電気絶縁用注型品には、少なくとも、２０年〜３０年の耐久性が要求されるので、使用年数に相当する温度サイクルの影響で、境界面に繰り返し応力が印加される。この繰り返し応力により、金属部品とエポキシ樹脂の密着力が低下して、境界面における剥離の発生に至ることがある。剥離により形成されたギャップ部では、部分放電が発生して、エポキシ樹脂内に放電ツリーが進展し、最終的には、絶縁物の内部破壊に至る。 Electrical equipment used outdoors is exposed to changes in temperature (temperature cycle) depending on the season and day and night, and in cast products manufactured by embedding metal parts in epoxy resin, metal parts and epoxy resin are used. Stress due to the difference in linear expansion coefficient between the two is generated at the boundary surface. In general, since a cast product for electrical insulation is required to have a durability of at least 20 to 30 years, a stress is repeatedly applied to the boundary surface under the influence of a temperature cycle corresponding to the service life. Due to this repeated stress, the adhesion between the metal part and the epoxy resin may be reduced, leading to the occurrence of peeling at the interface. In the gap portion formed by peeling, partial discharge occurs, a discharge tree develops in the epoxy resin, and eventually the internal breakdown of the insulator occurs.
この剥離発生を抑制する方法として、金属部品とエポキシ樹脂間の密着力を強固にすることが考えられる。密着力強化の具体的方法としては、金属部品の表面粗度を増加させて、エポキシ樹脂の硬化収縮によるアンカー効果を利用する方法が一般的であり、最も良く知られている方法として、サンドブラスト法による金属部品の表面処理がある。サンドブラスト法とは、コンプレッサーで硬い粒子（アルミナ）を吹きかけて、金属部品表面を研磨する方法であり、金属部品表面に微小な凹凸を形成することにより、エポキシ樹脂と金属部品との密着力を向上させる。 As a method for suppressing this occurrence of peeling, it is conceivable to strengthen the adhesion between the metal part and the epoxy resin. As a specific method for strengthening the adhesion, a method of increasing the surface roughness of metal parts and utilizing the anchor effect due to curing shrinkage of the epoxy resin is common, and the most well-known method is the sand blast method. There is surface treatment of metal parts. Sandblasting is a method of polishing hard metal (alumina) with a compressor to polish the surface of metal parts. By forming minute irregularities on the surface of metal parts, the adhesion between epoxy resin and metal parts is improved. Let
サンドブラスト法以外の表面処理法としては、陽極酸化処理が知られている（例えば、特許文献１参照）。
この方法は、希硫酸水溶液中で金属部品に直流電圧を印加して、アルミニウムイオンと酸素イオンの結合による陽極酸化により、金属部品表面に活性な状態の酸化皮膜を形成するものである。硫酸中の陽極酸化皮膜には、硫酸イオンにより表面が多孔性となる。このような陽極酸化処理を施した金属部品にエポキシ樹脂をモールドすることにより、陽極酸化皮膜中の微細孔部にエポキシ樹脂が充填され、良好な密着力が得られる。
An anodizing treatment is known as a surface treatment method other than the sand blast method (see, for example, Patent Document 1).
In this method, a DC voltage is applied to a metal part in a dilute sulfuric acid aqueous solution, and an active oxide film is formed on the surface of the metal part by anodic oxidation by bonding of aluminum ions and oxygen ions. The surface of the anodized film in sulfuric acid becomes porous due to sulfate ions. By molding an epoxy resin on such an anodized metal part, the fine holes in the anodized film are filled with the epoxy resin, and good adhesion can be obtained.
従来の金属表面処理法の一つであるサンドブラスト法では、金属部品表面に微小な凹凸が形成されるが、この凹凸が電界集中の原因になることがある。電気絶縁用注型品は埋め込まれた金属部品に高電圧が印加され、エポキシ樹脂により絶縁される構造であり、金属部品表面には非常に高い電界が発生する。
サンドブラスト処理を施した金属部品の表面に金属突起部が形成されると、更なる電界集中が起こり、この電界集中部が起点となり、エポキシ樹脂が絶縁破壊する恐れがある。このような理由から、サンドブラスト処理では注型品の電界をあまり高くできないとの問題点があった。
一方、陽極酸化処理の場合、上記電界集中は抑制できる効果があるが、陽極酸化処理で形成された微細孔は汚損されやすく、良好な密着力を得るためには、表面が活性な状態を保っている内に、エポキシ樹脂でモールドすることが必要であり、陽極酸化処理後の金属部品の厳格な管理が必要であるとの問題点があった。
In the sand blasting method, which is one of the conventional metal surface treatment methods, minute irregularities are formed on the surface of a metal part, but the irregularities may cause electric field concentration. The cast product for electrical insulation has a structure in which a high voltage is applied to an embedded metal part and is insulated by an epoxy resin, and a very high electric field is generated on the surface of the metal part.
If metal protrusions are formed on the surface of a metal part that has been sandblasted, further electric field concentration occurs, and this electric field concentration portion is the starting point, and there is a risk that the epoxy resin will break down. For these reasons, there has been a problem that the electric field of the cast product cannot be made very high by sandblasting.
On the other hand, in the case of anodizing treatment, the above-mentioned electric field concentration can be suppressed. However, the micropores formed by anodizing treatment are easily fouled, and in order to obtain good adhesion, the surface remains active. However, it is necessary to mold with an epoxy resin, and there is a problem that strict management of the metal parts after the anodizing treatment is necessary.
この発明は、上述のような課題を解決するためになされたもので、電界集中が起こらず、比較的容易に製造できて、良好な密着力が確保できる電気絶縁用注型品およびその製造方法を得ようとするものである。 The present invention has been made in order to solve the above-described problems, and is a cast product for electrical insulation that can be manufactured relatively easily without a concentration of electric field and can ensure a good adhesion, and a method for manufacturing the same. Is going to get.
この発明に係る電気絶縁用注型品では、アルミニウムで構成される金属部品をエポキシ樹脂によりモールド成形する電気機器用注型品において、エポキシ樹脂と接する金属部品の表面にクロメート皮膜が配置されているものである。 In the cast product for electrical insulation according to the present invention, the chromate film is disposed on the surface of the metal component in contact with the epoxy resin in the cast product for electrical equipment in which the metal component composed of aluminum is molded with the epoxy resin. Is.
また、この発明に係る電気絶縁用注型品の製造方法では、アルミニウムで構成される金属部品をエポキシ樹脂によりモールド成形する電気機器用注型品の製造方法において、アルミニウムで構成される金属部品の表面にクロメート皮膜を形成するクロメート皮膜形成工程と、前記クロメート皮膜形成工程によって表面にクロメート皮膜が配置された金属部品とエポキシ樹脂との間にプライマーが配置されている状態でエポキシ樹脂によりモールド成形する成形工程とを含むものである。 In the method for manufacturing an electrical insulation casting product according to the present invention, in the method for manufacturing an electrical equipment casting product in which a metal component composed of aluminum is molded with an epoxy resin, the metal component composed of aluminum is manufactured. A chromate film forming process for forming a chromate film on the surface, and molding with epoxy resin in a state where a primer is disposed between the epoxy resin and the metal part on which the chromate film is disposed on the surface by the chromate film forming process. A molding process.
この発明によれば、電界集中が起こらず、比較的容易に製造できて、良好な密着力が確保できる電気絶縁用注型品およびその製造方法を得ることができる。 According to the present invention, it is possible to obtain a cast product for electrical insulation that can be manufactured relatively easily without causing electric field concentration and that can secure a good adhesion, and a method for manufacturing the same.
実施の形態１．
この発明による実施の形態を図について説明する。図１は、この発明による実施の形態における電気絶縁用注型品の構成を示す断面図である。図２は、この発明による実施の形態における電気絶縁用注型品の強度比較データを示す線図である。
Embodiment 1 FIG.
An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing a configuration of a cast product for electrical insulation according to an embodiment of the present invention. FIG. 2 is a diagram showing strength comparison data of a cast product for electrical insulation according to an embodiment of the present invention.
図１において、金属部品１は、エポキシ樹脂２と接する表面にクロメート皮膜３を備えており、金属部品１とエポキシ樹脂２の間には、プライマー４が配置されている。
In FIG. 1, the metal component 1 includes a
金属をある種の溶液中に浸漬して表面に金属塩皮膜を形成する処理は、化成処理と呼ばれており、この金属を浸漬させる溶液として、クロム酸または重クロム酸塩を主成分として利用したものが、クロメート処理であり、クロメート処理で生成される皮膜がクロメート皮膜である。クロメート処理は代表的な化成処理法で、耐食性付与の後処理法として、また塗装下地用として密着性向上に、極めて有効な方法である。 The process of forming a metal salt film on the surface by immersing a metal in a certain solution is called a chemical conversion treatment. As a solution for immersing this metal, chromic acid or dichromate is used as the main component. This is chromate treatment, and the film produced by the chromate treatment is the chromate film. The chromate treatment is a typical chemical conversion treatment method, and is an extremely effective method for improving the adhesion as a post-treatment method for imparting corrosion resistance and for a coating base.
この発明による実施の形態における電気絶縁用注型品の製作は、以下の手順で行なわれる。
機械加工にて所定の形状に加工された金属部品１は、溶剤を用いた超音波脱脂後、アルカリ溶液による脱脂を行い、塩酸または硫酸に浸漬して、表面不純物を除去後、水洗にて、前工程での付着液を除去する。
クロメート処理は、市販の処理液〔セルメートＡ−４０４：日本マルセル（株）製〕を用いて、３０℃に温度管理したクロメート処理液中に１分間、浸漬する。
その後、水洗にて、クロメート処理液を除去後、熱風乾燥によりにより付着している水分を除去する。
上記の方法で製作された金属部品にエポキシ樹脂を有機溶媒で希釈したプライマーを塗布して、１３０℃／２時間の温度条件で加熱処理後、エポキシ樹脂２をモールドすることにより、電気絶縁用注型品が製造される。
このプライマーは、主剤であるビスフェノール型エポキシ樹脂とノボラック型エポキシ樹脂、および、硬化剤であるイミダゾールの混合物を有機溶剤（トルエンとメチルエチルケトンの混合物）で希釈したものである。また、エポキシ樹脂２は、主剤としての芳香族系エポキシ樹脂と、硬化剤としての酸無水物と、充填材としての電融アルミナ粉砕粒子とを、その組成とするものである。
Production of the cast product for electrical insulation in the embodiment according to the present invention is performed in the following procedure.
The metal part 1 machined into a predetermined shape by machining is degreased with an alkaline solution after ultrasonic degreasing using a solvent, immersed in hydrochloric acid or sulfuric acid to remove surface impurities, and then washed with water. Remove the adhering liquid from the previous step.
In the chromate treatment, a commercially available treatment solution [Celmate A-404: manufactured by Nippon Marcel Co., Ltd.] is used for immersion for 1 minute in a chromate treatment solution temperature-controlled at 30 ° C.
Thereafter, the chromate treatment solution is removed by washing with water, and then the adhering moisture is removed by hot air drying.
A metal part manufactured by the above method is coated with a primer obtained by diluting an epoxy resin with an organic solvent, heat-treated at a temperature condition of 130 ° C./2 hours, and then molded with an
This primer is obtained by diluting a mixture of a bisphenol type epoxy resin and a novolac type epoxy resin as main components and an imidazole as a curing agent with an organic solvent (a mixture of toluene and methyl ethyl ketone). The
このようにして製造された電気絶縁用注型品について、引張強度を比較すると、図２のうようになる。
従来技術によるサンドブラスト処理では２０ＭＰａ程度の強度であり、この発明によるクロメート処理だけの場合には３０ＭＰａ程度の強度となり、この発明によるクロメート処理にプライマーによる強化策を加えた場合には５０ＭＰａ程度の強度となる。
FIG. 2 shows a comparison of the tensile strengths of the cast products for electrical insulation thus manufactured.
In the conventional sandblasting treatment, the strength is about 20 MPa. In the case of only the chromate treatment according to the present invention, the strength is about 30 MPa. When the strengthening measure by the primer is added to the chromate treatment according to the present invention, the strength is about 50 MPa. Become.
以上のような構成を有する電気絶縁用注型品は、エポキシ樹脂と接する金属部品の表面がクロメート皮膜を備え、金属部品をエポキシ樹脂の間にプライマーを配置することにより、優れた密着性を有しており、長期間に亘る使用により、金属部品とエポキシ樹脂の間に剥離が生じない。
また、クロメート皮膜は、安価に製作でき、一般環境で非常に安定な膜であり、陽極酸化膜のような厳格な管理が不要である。更に金属部品表面に突起が形成されないので、サンドブラスト法の弊害である電界集中が起こらず、注型品の電界を高く設計することが可能となり、機器のコンパクト化が可能となる効果がある。
The cast product for electrical insulation having the above configuration has excellent adhesion by providing a chromate film on the surface of the metal part in contact with the epoxy resin and placing a primer between the metal part and the epoxy resin. Therefore, no peeling occurs between the metal part and the epoxy resin due to the use over a long period of time.
In addition, the chromate film can be manufactured at a low cost and is a very stable film in a general environment, and does not require strict management like an anodized film. Further, since no protrusion is formed on the surface of the metal part, electric field concentration, which is an adverse effect of the sandblasting method, does not occur, and it is possible to design the cast product with a high electric field, thereby making it possible to downsize the device.
この発明の活用例としては、ＳＦ６ガスを絶縁媒体として用いるガス絶縁母線装置（ＧＩＳ）やガス絶縁開閉装置（ＧＣＢ）などのガス絶縁機器の絶縁スペーサや絶縁ロッド等を挙げることができる。 Examples of the use of the present invention include insulating spacers and insulating rods of gas insulating devices such as gas insulating bus devices (GIS) and gas insulating switchgear (GCB) using SF 6 gas as an insulating medium.
この発明による実施の形態によれば、アルミニウムで構成される金属部品１をエポキシ樹脂２中に埋め込んでエポキシ樹脂２によりモールド成形する電気機器用注型品において、エポキシ樹脂２と接する金属部品１の表面にクロメート皮膜３が配置されているようにしたので、電界集中が起こらず、比較的容易に製造できて、良好な密着力が確保できる電気絶縁用注型品を得ることができる。
According to the embodiment of the present invention, in a cast product for an electric device in which a metal part 1 made of aluminum is embedded in an
また、この発明による実施の形態によれば、前項の構成において、表面にクロメート皮膜３が配置された金属部品１とエポキシ樹脂２との間にプライマー４が配置されているようにしたので、電界集中が起こらず、比較的容易に製造できて、更に良好な密着力が確保できる電気絶縁用注型品を得ることができる。
Further, according to the embodiment of the present invention, in the configuration of the preceding paragraph, the
さらに、この発明による実施の形態によれば、アルミニウムで構成される金属部品１をエポキシ樹脂２中に埋め込んでエポキシ樹脂２によりモールド成形する電気機器用注型品の製造方法において、アルミニウムで構成される金属部品１の表面にクロメート皮膜３を形成するクロメート皮膜形成工程と、前記クロメート皮膜形成工程によって表面にクロメート皮膜３が配置された金属部品１とエポキシ樹脂２との間にプライマー４が配置されている状態でエポキシ樹脂２によりモールド成形するモールド成形工程とを含むことを特徴とするので、電界集中が起こらず、陽極酸化膜による場合のような表面処理後の厳格な管理が不要で比較的容易に製造できて、良好な密着力が確保できる電気絶縁用注型品の製造方法を得ることができる。
Furthermore, according to the embodiment of the present invention, in the method for manufacturing a cast product for an electric device in which the metal part 1 made of aluminum is embedded in the
１ 金属部品、２ エポキシ樹脂、３ クロメート皮膜、４ プライマー。
1 Metal parts, 2 Epoxy resin, 3 Chromate film, 4 Primer.
Claims (3)
In a method for manufacturing a cast product for an electrical device in which a metal part made of aluminum is molded with an epoxy resin, a chromate film forming step of forming a chromate film on the surface of the metal part made of aluminum, and the formation of the chromate film A cast product for electrical insulation, comprising a molding step of molding with an epoxy resin in a state where a primer is disposed between a metal component having a chromate film disposed on the surface and an epoxy resin. Manufacturing method.
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| JP2005133779A JP4794207B2 (en) | 2005-05-02 | 2005-05-02 | Casting product for electrical insulation and manufacturing method thereof |
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| JP2005133779A JP4794207B2 (en) | 2005-05-02 | 2005-05-02 | Casting product for electrical insulation and manufacturing method thereof |
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| JP2006310205A true JP2006310205A (en) | 2006-11-09 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010138280A (en) * | 2008-12-11 | 2010-06-24 | Mitsubishi Electric Corp | Primer composition, cast article for electric insulation and method for producing the same |
| EP2575145A1 (en) * | 2011-09-29 | 2013-04-03 | Kabushiki Kaisha Toshiba | Electrical insulating cast article and manufacturing method thereof |
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| JPH0596682A (en) * | 1991-10-09 | 1993-04-20 | Nippon Steel Corp | Polyolefin-covered steel sheet pile having raised pattern and production thereof |
| JPH0714453A (en) * | 1993-06-25 | 1995-01-17 | Toshiba Corp | Cast for electric insulation and its manufacture |
| JPH07246679A (en) * | 1994-01-21 | 1995-09-26 | Nippon Parkerizing Co Ltd | Resin coated aluminum-containing metal composite material excellent in conductivity and production thereof |
| JPH09266617A (en) * | 1996-03-27 | 1997-10-07 | Hitachi Ltd | Gas insulated apparatus |
| JP2000329981A (en) * | 1997-04-15 | 2000-11-30 | Heriosu:Kk | Optical fiber housing metallic pipe and its production |
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2005
- 2005-05-02 JP JP2005133779A patent/JP4794207B2/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0596682A (en) * | 1991-10-09 | 1993-04-20 | Nippon Steel Corp | Polyolefin-covered steel sheet pile having raised pattern and production thereof |
| JPH0714453A (en) * | 1993-06-25 | 1995-01-17 | Toshiba Corp | Cast for electric insulation and its manufacture |
| JPH07246679A (en) * | 1994-01-21 | 1995-09-26 | Nippon Parkerizing Co Ltd | Resin coated aluminum-containing metal composite material excellent in conductivity and production thereof |
| JPH09266617A (en) * | 1996-03-27 | 1997-10-07 | Hitachi Ltd | Gas insulated apparatus |
| JP2000329981A (en) * | 1997-04-15 | 2000-11-30 | Heriosu:Kk | Optical fiber housing metallic pipe and its production |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010138280A (en) * | 2008-12-11 | 2010-06-24 | Mitsubishi Electric Corp | Primer composition, cast article for electric insulation and method for producing the same |
| EP2575145A1 (en) * | 2011-09-29 | 2013-04-03 | Kabushiki Kaisha Toshiba | Electrical insulating cast article and manufacturing method thereof |
| CN103029247A (en) * | 2011-09-29 | 2013-04-10 | 株式会社东芝 | Electrical insulating cast article and manufacturing method thereof |
| JP2013076118A (en) * | 2011-09-29 | 2013-04-25 | Toshiba Corp | Electrical insulating cast article and manufacturing method thereof |
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| Publication number | Publication date |
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| JP4794207B2 (en) | 2011-10-19 |
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