JP2002260910A - Electromagnetic steel sheet with insulating film of good adhesion - Google Patents
Electromagnetic steel sheet with insulating film of good adhesionInfo
- Publication number
- JP2002260910A JP2002260910A JP2001054325A JP2001054325A JP2002260910A JP 2002260910 A JP2002260910 A JP 2002260910A JP 2001054325 A JP2001054325 A JP 2001054325A JP 2001054325 A JP2001054325 A JP 2001054325A JP 2002260910 A JP2002260910 A JP 2002260910A
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- JP
- Japan
- Prior art keywords
- steel sheet
- electromagnetic steel
- laminated
- insulating coating
- present
- 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.)
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Links
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- Adhesives Or Adhesive Processes (AREA)
- Soft Magnetic Materials (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Laminated Bodies (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、回転器、変圧器等
に用いられる積層鉄芯の材料として用いられる、加熱接
着型の絶縁被膜付き電磁鋼板に関する。また、本発明
は、積層電磁鋼板および積層鉄芯ならびにこれらの製造
方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-bonding type electromagnetic steel sheet with an insulating coating, which is used as a material for a laminated iron core used for a rotator, a transformer and the like. In addition, the present invention relates to a laminated electromagnetic steel sheet and a laminated iron core, and a method for producing the same.
【０００２】[0002]
【従来の技術】従来、回転器、変圧器等の電気機器に使
用される鉄芯は、まず電磁鋼板に渦電流を減少させるた
めの絶縁被膜を施し、それを打ち抜き、またはせん断加
工し、多数積み重ね、更に、溶接、カシメまたは接着剤
により固着させることにより製造されていた。しかしな
がら、溶接により固着させる方法には、鉄芯エッジ部が
短絡され絶縁性が低下するという問題や、熱歪みにより
磁気特性が劣化するという問題があった。また、カシメ
により固着させる方法には、加工歪みにより磁気特性が
劣化するという問題があった。また、接着剤により固着
させる方法には、上述したような磁気特性の劣化の問題
はあまりないが、電磁鋼板１枚毎に接着剤を塗布する必
要があるため作業性が悪いという問題や、絶縁被膜間で
の接着力が十分でないという問題があった。2. Description of the Related Art Conventionally, iron cores used for electric devices such as a rotator and a transformer are coated with an insulating film for reducing eddy current on an electromagnetic steel sheet, and then punched or sheared. They have been manufactured by stacking and then by welding, caulking or gluing. However, the method of fixing by welding has a problem that an iron core edge portion is short-circuited and insulation properties are reduced, and a problem that magnetic properties are deteriorated due to thermal strain. Further, the method of fixing by caulking has a problem that magnetic characteristics are deteriorated due to processing distortion. In the method of fixing with an adhesive, there is not much problem of deterioration of the magnetic characteristics as described above, but it is necessary to apply the adhesive to each magnetic steel sheet, so that the workability is poor, There was a problem that the adhesive force between the coatings was not sufficient.
【０００３】これに対し、特開平２−２０８０３４号公
報には、ガラス転移温度６０℃以上の熱可塑性アクリル
樹脂エマルジョン、エポキシ樹脂エマルジョン等を主成
分とする組成物を塗布し乾燥して得られた鋼板を積層
し、加熱加圧して積層鉄芯を製造する方法が記載されて
いる。この方法は、接着剤を塗布する工程を省略したも
のであり、加工歪みの影響を受けにくく、コイル状に巻
いた場合においてもブロッキングしにくいという利点を
有する。しかしながら、上記方法で製造された電磁鋼板
（以下「従来の加熱接着型電磁鋼板」という。）を加熱
加圧して得られた実際の積層鉄芯においては、接着が不
完全な部分が存在する場合があり、ひどい時には接着不
良による層間はく離（接着面でのはく離）を引き起こす
という問題があった。特に、鉄芯が大きい場合には、被
膜や鋼板の凹凸の影響を受けやすく、問題が顕在化しや
すかった。On the other hand, Japanese Patent Application Laid-Open No. Hei 2-208034 discloses a composition obtained by applying and drying a composition mainly composed of a thermoplastic acrylic resin emulsion or epoxy resin emulsion having a glass transition temperature of 60 ° C. or higher. A method is described in which steel sheets are laminated and heated and pressed to produce a laminated iron core. This method has an advantage that the step of applying the adhesive is omitted, and the method is less susceptible to processing distortion and is less likely to be blocked even when wound in a coil shape. However, in an actual laminated iron core obtained by heating and pressing an electromagnetic steel sheet manufactured by the above method (hereinafter, referred to as “conventional heat-bonded electromagnetic steel sheet”), there is a case where an incompletely bonded portion exists. In severe cases, there is a problem that interlayer delamination (peeling at the bonding surface) is caused by poor bonding. In particular, when the iron core was large, it was easily affected by the unevenness of the coating or the steel plate, and the problem was likely to become apparent.
【０００４】図を用いて説明する。図１は、従来の加熱
接着型電磁鋼板を積層し、加熱加圧して得られる積層鉄
芯１における、接着性樹脂を含有する絶縁被膜２の模式
的な断面図である。接着前において、絶縁被膜２の表面
は外観上全く平坦に見えていても、塗布時の塗布ロール
のローピング等による微妙な畝状の被膜の凹凸が存在し
ており、加熱加圧を行ってもその凹部が接着しない場合
がある。その結果、接着良好部分３と非接着部分４とが
縞状に存在し、完全接着に至らないことが生じうる。こ
れが、積層鉄芯１の積層コアの内外を密封したい場合に
おいては、漏れの原因となる。また、板厚偏差、膜厚偏
差等の理由により加圧不足となった部分においては、絶
縁被膜２同士が十分に貼り付かずに、コア割れを起こす
場合がある。コア割れ部分５は、層間はく離を起こして
いる部分である。実際の製品には、板厚偏差、膜厚偏
差、絶縁被膜の凹凸等がどうしても存在し、一方、加熱
加圧時の圧力も装置の都合上大きくすることができない
ことも多いため、上記問題が生じる可能性は多かれ少な
かれ残ってしまう。A description will be given with reference to the drawings. FIG. 1 is a schematic cross-sectional view of an insulating coating 2 containing an adhesive resin in a laminated iron core 1 obtained by laminating a conventional heat-bonded electromagnetic steel sheet and applying heat and pressure. Before bonding, even if the surface of the insulating coating 2 looks completely flat in appearance, there are fine irregularities of the ridge-shaped coating due to roping of the application roll at the time of application, and even if heating and pressing are performed. The recess may not adhere. As a result, the good adhesion portion 3 and the non-adhesion portion 4 exist in a striped shape, and it may not be completely adhered. This causes leakage when it is desired to seal the inside and outside of the laminated core of the laminated iron core 1. Further, in a portion where the pressurization is insufficient due to a plate thickness deviation, a film thickness deviation, or the like, the insulating coatings 2 may not be sufficiently adhered to each other, resulting in core cracking. The core cracked portion 5 is a portion in which interlayer separation has occurred. In actual products, there are inevitably plate thickness deviation, film thickness deviation, unevenness of the insulating coating, etc.On the other hand, the pressure at the time of heating and pressurization cannot often be increased due to the convenience of the equipment, so the above problem has been raised. The possibilities are more or less left.
【０００５】[0005]
【発明が解決しようとする課題】したがって、本発明
は、表面に接着性樹脂を含有する絶縁被膜を有する電磁
鋼板であって、積層し加熱加圧した場合に、該絶縁被膜
同士が十分に接着しうる電磁鋼板を提供することを目的
とする。また、本発明は、電磁鋼板を２枚以上積層して
なる積層電磁鋼板であって、各電磁鋼板の間の接着性樹
脂を含有する接着層により電磁鋼板同士が十分に接着し
ている積層電磁鋼板、およびその製造方法を提供するこ
とを目的とする。更に、本発明は、電磁鋼板を２枚以上
積層してなる積層鉄芯であって、各電磁鋼板の間の接着
性樹脂を含有する接着層により電磁鋼板同士が十分に接
着している積層鉄芯、およびその製造方法を提供するこ
とを目的とする。SUMMARY OF THE INVENTION Accordingly, the present invention is directed to an electromagnetic steel sheet having an insulating coating containing an adhesive resin on its surface, and when laminated and heated and pressed, the insulating coatings are sufficiently bonded to each other. It is an object of the present invention to provide a magnetic steel sheet that can be used. The present invention is also a laminated electromagnetic steel sheet formed by laminating two or more electromagnetic steel sheets, wherein the electromagnetic steel sheets are sufficiently bonded to each other by an adhesive layer containing an adhesive resin between the respective electromagnetic steel sheets. An object of the present invention is to provide a steel sheet and a method for manufacturing the same. Further, the present invention provides a laminated iron core formed by laminating two or more magnetic steel sheets, wherein the laminated magnetic steel sheets are sufficiently bonded to each other by an adhesive layer containing an adhesive resin between the respective magnetic steel sheets. It is an object to provide a core and a method for producing the core.
【０００６】[0006]
【課題を解決するための手段】本発明者は、上記課題を
解決すべく鋭意研究した結果、絶縁被膜を構成する接着
性樹脂に特定量の発泡剤を含有させておくと、加熱加圧
時に発泡剤が発泡し、絶縁被膜が膨張して非接着部分が
生じないことを見出し、本発明を完成した。Means for Solving the Problems The inventors of the present invention have made intensive studies to solve the above-mentioned problems, and as a result, if a specific amount of a foaming agent is contained in the adhesive resin constituting the insulating film, the heating and pressurizing can be performed. The present inventor has found that the foaming agent foams and the insulating film expands, and no non-adhesive portion is formed, and the present invention has been completed.
【０００７】即ち、本発明は、電磁鋼板の少なくとも一
方の表面に絶縁被膜を設けてなる絶縁被膜付き電磁鋼板
であって、該絶縁被膜が接着性樹脂および発泡剤を含有
し、該発泡剤の含有量が該接着性樹脂１００質量部に対
して０．０１〜２質量部である絶縁被膜付き電磁鋼板を
提供する。図２は、上述した（ａ）従来の加熱接着型電
磁鋼板を積層してなる積層電磁鋼板と、（ｂ）本発明の
絶縁被膜付き電磁鋼板を積層してなる積層電磁鋼板の加
熱加圧前後の状態を示す断面模式図である。なお、本発
明の絶縁被膜付き電磁鋼板はこれに限定されない。電磁
鋼板１１に接着性樹脂被膜（接着性樹脂を含有する絶縁
被膜）１２を設けてなる従来の加熱接着型電磁鋼板１０
は、積層して加熱加圧すると、接着性樹脂被膜１２の凹
凸に起因して、接着良好部分１３と非接着部分１４とが
生じてしまう。これに対して、電磁鋼板２１に接着性樹
脂および発泡剤を含有する絶縁被膜２２を設けてなる本
発明の絶縁被膜付き電磁鋼板２０は、積層して加熱加圧
すると、加熱により発泡剤の一部または全部が発泡して
気泡２３が生じ、これにより絶縁被膜２２が膨張して、
絶縁被膜２２同士の間に隙間を生じさせることなく、接
着するのである。したがって、本発明の絶縁被膜付き電
磁鋼板によれば、積層し加熱加圧した場合に、絶縁被膜
同士が十分に密接に接着しうる。Namely, the present invention is at least on one surface formed by providing an insulating film insulating coating with an electromagnetic steel plate of the electromagnetic steel sheet, the insulating coating contains an adhesive resin and a blowing agent, the blowing agent Provided is an electromagnetic steel sheet with an insulating coating, the content of which is 0.01 to 2 parts by mass with respect to 100 parts by mass of the adhesive resin. FIG. 2 shows before and after heating and pressing of (a) the laminated electromagnetic steel sheet obtained by laminating the conventional heat-bonded electromagnetic steel sheet and (b) the laminated electromagnetic steel sheet obtained by laminating the electromagnetic steel sheet with the insulating coating of the present invention. FIG. 4 is a schematic sectional view showing the state of FIG. In addition, the electromagnetic steel sheet with an insulating coating of the present invention is not limited to this. A conventional heat-bonded electromagnetic steel sheet 10 comprising an electromagnetic steel sheet 11 provided with an adhesive resin film (insulating film containing an adhesive resin) 12
When the layers are laminated and heated and pressed, the good adhesion portion 13 and the non-adhesion portion 14 occur due to the unevenness of the adhesive resin film 12. On the other hand, when the electromagnetic steel sheet 20 with the insulating coating of the present invention in which the insulating steel sheet 22 containing the adhesive resin and the foaming agent is provided on the electromagnetic steel sheet 21 is laminated and heated and pressurized, one sheet of the foaming agent is heated. A part or the whole foams to generate a bubble 23, whereby the insulating coating 22 expands,
The bonding is performed without generating a gap between the insulating coatings 22. Therefore, according to the magnetic steel sheet with the insulating coating of the present invention, the insulating coatings can be sufficiently closely adhered to each other when they are laminated and heated and pressed.
【０００８】また、本発明は、電磁鋼板を２枚以上積層
してなる積層電磁鋼板であって、各電磁鋼板の間に接着
性樹脂を含有する接着層を有し、該接着層が接着層の厚
さより径の小さい気泡を多数有する積層電磁鋼板を提供
する。Further, the present invention is a laminated electromagnetic steel sheet comprising two or more electromagnetic steel sheets, wherein the laminated magnetic steel sheet has an adhesive layer containing an adhesive resin between the respective electromagnetic steel sheets, and the adhesive layer is an adhesive layer. To provide a laminated electromagnetic steel sheet having a large number of air bubbles having a diameter smaller than the thickness of the laminated electromagnetic steel sheet.
【０００９】また、本発明は、電磁鋼板を２枚以上積層
してなる積層鉄芯であって、各電磁鋼板の間に接着性樹
脂を含有する接着層を有し、該接着層が接着層の厚さよ
り径の小さい気泡を多数有する積層鉄芯を提供する。[0009] The present invention is also a laminated iron core formed by laminating two or more electromagnetic steel sheets, having an adhesive layer containing an adhesive resin between the respective electromagnetic steel sheets, wherein the adhesive layer is an adhesive layer. To provide a laminated iron core having a large number of bubbles having a diameter smaller than the thickness of the laminated iron core.
【００１０】また、本発明は、前記絶縁被膜付き電磁鋼
板を前記絶縁被膜同士が接着するように２枚以上積層し
た後、前記発泡剤の分解開始温度以上の温度になるよう
に加熱加圧して、前記発泡剤の一部または全部を発泡さ
せることにより積層電磁鋼板を得ることを特徴とする積
層電磁鋼板の製造方法を提供する。Further, the present invention, the after the insulation coating with an electromagnetic steel sheet wherein the insulating film mutually stacked two or more sheets to adhere, by heating and pressing so that the decomposition start temperature or higher of the blowing agent And a method for producing a laminated electromagnetic steel sheet, characterized in that a laminated electromagnetic steel sheet is obtained by foaming a part or all of the foaming agent.
【００１１】また、本発明は、前記絶縁被膜付き電磁鋼
板を前記絶縁被膜同士が接着するように２枚以上積層し
た後、前記発泡剤の分解開始温度以上の温度になるよう
に加熱加圧して、前記発泡剤の一部または全部を発泡さ
せることにより積層鉄芯を得ることを特徴とする積層鉄
芯の製造方法を提供する。[0011] Further, the present invention provides a method according to the present invention, wherein two or more electromagnetic steel sheets provided with an insulating coating are laminated so that the insulating coatings adhere to each other, and then heated and pressed to a temperature not lower than the decomposition starting temperature of the foaming agent. And a method for manufacturing a laminated iron core, characterized in that a laminated iron core is obtained by foaming a part or all of the foaming agent.
【００１２】[0012]
【発明の実施の形態】以下、本発明について詳細に説明
する。初めに、本発明の絶縁被膜付き電磁鋼板について
説明する。本発明の絶縁被膜付き電磁鋼板は、電磁鋼板
の少なくとも一方の表面に絶縁被膜を設けてなる絶縁被
膜付き電磁鋼板であって、該絶縁被膜が接着性樹脂およ
び発泡剤を含有し、該発泡剤の含有量が該接着性樹脂１
００質量部に対して０．０１〜２質量部であることを特
徴とする。BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail. First, the electrical steel sheet with an insulating coating of the present invention will be described. The electromagnetic steel sheet with an insulating coating of the present invention is an electromagnetic steel sheet with an insulating coating formed by providing an insulating coating on at least one surface of the electromagnetic steel sheet, wherein the insulating coating contains an adhesive resin and a foaming agent, and the foaming agent Of the adhesive resin 1
The amount is 0.01 to 2 parts by mass with respect to 00 parts by mass.
【００１３】本発明の絶縁被膜付き電磁鋼板に用いられ
る電磁鋼板（電気鉄板）としては、公知のものを用いる
ことができ、無方向性、１方向性、２方向性などいずれ
のものでもよい。電磁鋼板の化学組成は、特に限定され
ない。また、電磁鋼板の板厚は、特に限定されないが、
通常の厚みである０．０５〜１．０ｍｍ程度とするのが
好ましい。As the electromagnetic steel sheet (electric iron sheet) used in the electromagnetic steel sheet with an insulating coating of the present invention, known ones can be used, and any of non-directional, one-way, two-way, etc. may be used. The chemical composition of the electrical steel sheet is not particularly limited. The thickness of the electromagnetic steel sheet is not particularly limited,
The thickness is preferably about 0.05 to 1.0 mm, which is a normal thickness.
【００１４】本発明に用いられる接着性樹脂は、特に限
定されず、アクリル系、エポキシ系、フェノール系、シ
リコーン系等の樹脂を用いることができ、これらを単独
でまたは２種以上の接着性樹脂の混合物として用いるこ
とができる。また、アミン系硬化剤、シリカ等の添加物
を本発明の効果を損なわない範囲で添加することができ
る。本発明に用いられる接着性樹脂は、ガラス転移温度
または軟化温度が６０℃以上であるのが好ましい。ガラ
ス転移温度または軟化温度が６０℃以上であると、良好
な接着強度が得られ、かつ、コイル状に巻き取った場合
においても鋼板同士のブロッキングを抑制することがで
きる。The adhesive resin used in the present invention is not particularly limited, and an acrylic resin, an epoxy resin, a phenol resin, a silicone resin or the like may be used. These resins may be used alone or in combination of two or more. Can be used as a mixture. In addition, additives such as an amine-based curing agent and silica can be added as long as the effects of the present invention are not impaired. The adhesive resin used in the present invention preferably has a glass transition temperature or a softening temperature of 60 ° C. or higher. When the glass transition temperature or the softening temperature is 60 ° C. or higher, good adhesive strength can be obtained, and blocking between steel sheets can be suppressed even when wound up in a coil shape.
【００１５】本発明に用いられる発泡剤は、化学発泡剤
であり、加熱により窒素、二酸化炭素、一酸化炭素、ア
ンモニア、水素等のガスを発生させるものである。発泡
剤としては、有機系発泡剤および無機系発泡剤のいずれ
も用いることができる。有機系発泡剤としては、例え
ば、アゾジカルボンアミド、アゾビスホルムアミド、ア
ゾビスイソブチロニトリル、アゾジカルポン酸バリウム
等のアゾ化合物；Ｎ，Ｎ´−ジニトロソペンタメチレン
テトラミン、Ｎ，Ｎ´−ジニトロソ−Ｎ，Ｎ´−ジメチ
ルテレフタルアミド等のニトロソ化合物；ベンゼンスル
ホニルヒドラジッド、ｐ−トルエンスルホニルヒドラジ
ッド、ｐ，ｐ´−オキシビスベンゼンスルホニルヒドラ
ジッド等のスルホニルヒドラジッド化合物；ｐ−トルエ
ンスルホニルセミカルバジッド等のスルホニルセミカル
バジッド化合物；５−フェニルテトラゾール、５−フェ
ニル−１Ｈ−テトラゾール等のテトラゾール化合物が挙
げられる。無機系発泡剤としては、例えば、重炭酸ナト
リウム、炭酸アンモニウム、重炭酸アンモニウム、亜硝
酸アンモニウム、カルシウムアジド等のアジド化合物；
ホウ水素化ナトリウム；およびこれらに有機酸を添加し
たものが挙げられる。これらの発泡剤は、本発明を損な
わない範囲で、複合させて用いてもよい。The blowing agent used in the present invention is a chemical blowing agent, which generates a gas such as nitrogen, carbon dioxide, carbon monoxide, ammonia and hydrogen by heating. As the foaming agent, any of an organic foaming agent and an inorganic foaming agent can be used. Examples of the organic foaming agent include azodicarbonamide, azodicarbonamide, azobisisobutyronitrile, azo compounds such as barium Azojikarupon acid; N, N'-dinitrosopentamethylenetetramine, N, N'-dinitroso - Nitroso compounds such as N, N'-dimethyl terephthalamide; sulfonyl hydrazide compounds such as benzenesulfonyl hydrazide, p-toluenesulfonyl hydrazide, p, p'-oxybisbenzenesulfonyl hydrazide; p-toluenesulfonyl semicarbazide Sulfonyl semicarbazide compounds; and tetrazole compounds such as 5-phenyltetrazole and 5-phenyl-1H-tetrazole. Examples of the inorganic blowing agent include azide compounds such as sodium bicarbonate, ammonium carbonate, ammonium bicarbonate, ammonium nitrite, and calcium azide;
Sodium borohydride; and those obtained by adding an organic acid thereto. These foaming agents may be used in combination as long as the present invention is not impaired.
【００１６】発泡剤の分解開始温度および分解温度は、
特に限定されない。ここで、本発明における分解開始温
度および分解温度について、図３を用いて説明する。図
３は、発泡剤を昇温速度２℃／分で加熱した場合の温度
とガス発生量との関係を示すグラフである。本発明にお
ける発泡剤の分解開始温度は、昇温速度２℃／分で加熱
した場合にガス発生量が急激に増加し始める温度であ
り、図３における接線ａと接線ｂとの交点の温度であ
る。また、本発明における発泡剤の分解温度は昇温速度
２℃／分で加熱した場合にガス発生量が飽和する温度で
あり、図３における接線ｃと接線ｄとの交点の温度であ
る。The decomposition initiation temperature and decomposition temperature of the foaming agent are as follows:
There is no particular limitation. Here, the decomposition start temperature and the decomposition temperature in the present invention will be described with reference to FIG. FIG. 3 is a graph showing the relationship between the temperature and the amount of gas generated when the blowing agent is heated at a heating rate of 2 ° C./min. The decomposition start temperature of the foaming agent in the present invention is a temperature at which the amount of gas generation starts to rapidly increase when heated at a heating rate of 2 ° C./min, and is the temperature at the intersection of the tangents a and b in FIG. is there. The decomposition temperature of the blowing agent in the present invention is a temperature at which the gas generation amount is saturated when heated at a heating rate of 2 ° C./min, and is the temperature at the intersection of the tangents c and d in FIG.
【００１７】本発明の絶縁被膜付き電磁鋼板の絶縁被膜
における発泡剤の含有量は、接着性樹脂１００質量部に
対して０．０１〜２質量部である。絶縁被膜における発
泡剤の含有量は、絶縁被膜を十分に膨張させる点で、接
着性樹脂１００質量部に対して、０．０１質量部以上で
あり、好ましくは０．０２質量部以上、より好ましくは
０．０５質量部以上、更に好ましくは０．１０質量部以
上である。また、絶縁被膜における発泡剤の含有量は、
被膜の密度を維持して接着強度を維持する点で、接着性
樹脂１００質量部に対して、２質量部以下であり、好ま
しくは１．５質量部以下、より好ましくは１．０質量部
以下である。The content of the foaming agent in the insulating coating of the magnetic steel sheet with the insulating coating of the present invention is 0.01 to 2 parts by mass based on 100 parts by mass of the adhesive resin. The content of the foaming agent in the insulating coating is 0.01 parts by mass or more, preferably 0.02 parts by mass or more, more preferably 0.02 parts by mass, based on 100 parts by mass of the adhesive resin, in that the insulating film is sufficiently expanded. Is at least 0.05 part by mass, more preferably at least 0.10 part by mass. In addition, the content of the foaming agent in the insulating coating,
In terms of maintaining the density of the coating and maintaining the adhesive strength, the amount is 2 parts by mass or less, preferably 1.5 parts by mass or less, more preferably 1.0 part by mass or less with respect to 100 parts by mass of the adhesive resin. It is.
【００１８】本発明の絶縁被膜付き電磁鋼板は、後述す
る本発明の積層電磁鋼板および本発明の積層鉄芯に好適
に用いられるためには、発泡剤が接着性樹脂中に均一に
分散し、接着後の膜厚より小さい気泡を生成させうるの
が好ましい。In order for the magnetic steel sheet with an insulating coating of the present invention to be suitably used for the laminated magnetic steel sheet of the present invention and the laminated iron core of the present invention, a foaming agent is uniformly dispersed in an adhesive resin. It is preferable that bubbles smaller than the film thickness after bonding can be generated.
【００１９】本発明の絶縁被膜付き電磁鋼板の絶縁被膜
は、上記発泡剤の発泡に関する温度特性を調整するため
に、分解促進剤（発泡助剤）を含有することができる。
分解促進剤としては、特に限定されず、用いられる発泡
剤に応じて公知のものを用いることができる。例えば、
尿素、ステアリン酸、二塩基性フタル酸鉛、二塩基性亜
リン酸鉛、ルイス酸を有する金属化合物が挙げられる。The insulating coating of the magnetic steel sheet with the insulating coating of the present invention may contain a decomposition accelerator (foaming aid) in order to adjust the temperature characteristics relating to the foaming of the foaming agent.
The decomposition accelerator is not particularly limited, and a known one may be used depending on the foaming agent used. For example,
Examples include urea, stearic acid, dibasic lead phthalate, dibasic lead phosphite, and metal compounds having a Lewis acid.
【００２０】本発明の絶縁被膜付き電磁鋼板の絶縁被膜
は、各種性能の一層の向上ために、防錆剤等の添加剤を
含有することができる。この場合、歪取り焼鈍後の性能
を確保するために、絶縁被膜における無機物質の合計量
は、有機物質１００質量部に対して３〜３００質量部と
するのが好ましい。The insulating coating of the magnetic steel sheet with an insulating coating according to the present invention can contain additives such as a rust preventive for further improving various performances. In this case, in order to secure the performance after the strain relief annealing, the total amount of the inorganic substance in the insulating coating is preferably 3 to 300 parts by mass with respect to 100 parts by mass of the organic substance.
【００２１】本発明の絶縁被膜付き電磁鋼板の絶縁被膜
の厚さは、特に限定されないが、十分な層間抵抗を得ら
れる点で、０．０５μｍ以上であるのが好ましく、０．
１μｍ以上であるのがより好ましく、また、占積率（積
層電磁鋼板や積層鉄芯とした場合の全体に対する地鉄の
割合）を高く保つため、２５μｍ以下であるのが好まし
く、１０μｍ以下であるのがより好ましい。The thickness of the insulating coating of the magnetic steel sheet provided with the insulating coating of the present invention is not particularly limited, but is preferably 0.05 μm or more from the viewpoint of obtaining a sufficient interlayer resistance.
The thickness is more preferably 1 μm or more, and is preferably 25 μm or less, and more preferably 10 μm or less, in order to keep the space factor (the ratio of the ground iron to the whole in the case of a laminated electromagnetic steel sheet or a laminated iron core) high. Is more preferred.
【００２２】本発明の絶縁被膜付き電磁鋼板は、製造方
法を特に限定されない。例えば、エマルジョン、ディス
パージョン等の水系の接着性樹脂をロールコーター法、
フローコーター法、スプレー塗装、ナイフコーター法
等、種々の方法で電磁鋼板に塗布し、通常実施されるよ
うな熱風式、赤外式、誘導加熱式等の方法で焼付処理を
行う方法が挙げられる。これらの工程は、電磁鋼板を切
り板状としてから行ってもよいが、コイル状のままで行
った方が生産性が高く、実用的である。また、これらの
工程は、用いられる発泡剤の分解温度以下、好ましくは
分解開始温度以下で行う。これにより、製造工程での発
泡剤の発泡を抑制し、本発明の絶縁被膜付き電磁鋼板を
積層して加熱加圧した場合における発泡性能を担保する
ことができる。したがって、本発明の絶縁被膜付き電磁
鋼板は、発泡剤の少なくとも一部が発泡性能を有してい
る。The method for producing the magnetic steel sheet with an insulating coating of the present invention is not particularly limited. For example, a water-based adhesive resin such as an emulsion or a dispersion is roll-coated by a roll coater method,
A method of applying to a magnetic steel sheet by various methods such as a flow coater method, a spray coating method, a knife coater method and the like, and performing a baking treatment by a method such as a hot air method, an infrared method, or an induction heating method which is usually performed. . These steps may be performed after the electromagnetic steel sheet is cut into a plate shape, but it is more practical and practical to perform the process while keeping the coil shape. In addition, these steps are performed at a temperature equal to or lower than the decomposition temperature of the foaming agent used, and preferably equal to or lower than the decomposition start temperature. Thereby, foaming of the foaming agent in the production process can be suppressed, and the foaming performance when the electromagnetic steel sheets with the insulating coating of the present invention are laminated and heated and pressed can be ensured. Therefore, in the electrical steel sheet with an insulating coating of the present invention, at least a part of the foaming agent has foaming performance.
【００２３】本発明の絶縁被膜付き電磁鋼板は、積層し
加熱加圧した場合に、発泡剤が発泡して絶縁被膜を膨張
させて、絶縁被膜同士の間に隙間を生じることなく十分
に密接に接着しうるので、接着不良による層間はく離を
引き起こすことがない。また、本発明の絶縁被膜付き電
磁鋼板においては、製造の際に、絶縁性が低下したり、
熱歪みや加工歪みにより磁気特性が劣化したりするとい
う問題がなく、また、絶縁被膜形成後に更に接着剤を塗
布する必要がないので、作業性が悪いという問題もな
い。In the magnetic steel sheet with an insulating coating according to the present invention, when laminated and heated and pressed, the foaming agent expands and expands the insulating coating, so that the insulating coating is sufficiently tightly closed without gaps between the insulating coatings. Since they can be bonded, delamination due to poor bonding does not occur. Further, in the magnetic steel sheet with an insulating coating of the present invention, during the production, the insulation is reduced,
There is no problem that the magnetic characteristics are deteriorated by heat distortion or mechanical damage, also, it is not necessary to apply a further bonding agent after the insulating film formation, there is no problem of poor workability.
【００２４】特開平４−２３５２８６号公報には、有機
発泡剤等を配合した重クロム酸水溶液を塗布して得られ
る電気絶縁被膜を有する電磁鋼板が記載されている。こ
の電磁鋼板は、被膜形成時に発泡剤を発泡させ、絶縁被
膜層内に均一な気泡構造を生じさせたものである。しか
し、この電磁鋼板を積層し加熱加圧することにより積層
電磁鋼板を製造する場合には、従来の加熱接着型電磁鋼
板と同様に、被膜表面の凹凸等から生じる接着不良の問
題がある。これに対し、本発明の絶縁被膜付き電磁鋼板
は、被膜形成時等における発泡を抑制し発泡性能を担保
したものであるので、積層して加熱加圧すると、発泡剤
が発泡して絶縁被膜を膨張させて、絶縁被膜同士の間に
隙間を生じることがないので、接着不良の問題がない。Japanese Patent Application Laid-Open No. 4-235286 describes an electromagnetic steel sheet having an electric insulating film obtained by applying an aqueous solution of dichromic acid containing an organic foaming agent and the like. This electromagnetic steel sheet is obtained by foaming a foaming agent at the time of forming a film to generate a uniform cell structure in the insulating film layer. However, when a laminated electromagnetic steel sheet is manufactured by laminating the electromagnetic steel sheets and applying heat and pressure, there is a problem of poor adhesion caused by irregularities on the surface of the coating film as in the case of the conventional heat-bonded electromagnetic steel sheet. On the other hand, since the electromagnetic steel sheet with the insulating coating of the present invention suppresses foaming at the time of forming the coating and secures the foaming performance, when laminated and heated and pressed, the foaming agent foams to form the insulating coating. Since there is no gap between the insulating coatings due to expansion, there is no problem of poor adhesion.
【００２５】つぎに、本発明の積層電磁鋼板について説
明する。本発明の積層電磁鋼板は、電磁鋼板を２枚以上
積層してなる積層電磁鋼板であって、各電磁鋼板の間に
接着性樹脂を含有する接着層を有し、該接着層が接着層
の厚さより径の小さい気泡を多数有することを特徴とす
る。本発明の積層電磁鋼板は、接着層が十分に強度を有
し、接着不良による層間はく離等の問題がない。Next, the laminated magnetic steel sheet of the present invention will be described. The laminated electromagnetic steel sheet of the present invention is a laminated electromagnetic steel sheet obtained by laminating two or more electromagnetic steel sheets, and has an adhesive layer containing an adhesive resin between each of the electromagnetic steel sheets, and the adhesive layer is an adhesive layer. It is characterized by having a large number of bubbles having a diameter smaller than the thickness. In the laminated electromagnetic steel sheet of the present invention, the adhesive layer has sufficient strength and there is no problem such as delamination due to poor adhesion.
【００２６】本発明の積層電磁鋼板に用いられる電磁鋼
板および接着性樹脂は、上述した本発明の絶縁被膜付き
電磁鋼板に用いられるものと同様である。また、本発明
の積層電磁鋼板の接着層は、本発明の絶縁被膜付き電磁
鋼板の絶縁被膜と同様に、防錆剤等の添加剤を含有する
ことができる。The magnetic steel sheet and the adhesive resin used for the laminated magnetic steel sheet of the present invention are the same as those used for the above-mentioned magnetic steel sheet with an insulating film of the present invention. Further, the adhesive layer of the laminated magnetic steel sheet of the present invention can contain additives such as a rust preventive, like the insulating coating of the magnetic steel sheet with the insulating coating of the present invention.
【００２７】本発明の積層電磁鋼板の接着層の厚さは、
特に限定されないが、十分な層間抵抗を得られる点で、
０．０５μｍ以上であるのが好ましく、０．１μｍ以上
であるのがより好ましく、また、占積率を高く保つた
め、２５μｍ以下であるのが好ましく、１５μｍ以下で
あるのがより好ましい。The thickness of the adhesive layer of the laminated electromagnetic steel sheet of the present invention is as follows:
Although not particularly limited, in that a sufficient interlayer resistance can be obtained,
It is preferably at least 0.05 μm, more preferably at least 0.1 μm, and in order to keep the space factor high, it is preferably at most 25 μm, more preferably at most 15 μm.
【００２８】本発明の積層電磁鋼板の接着層は、接着層
の厚さより径の小さい気泡を多数有する。気泡の径が接
着層の厚さより大きいと、接着強度が弱くなる。The adhesive layer of the laminated electromagnetic steel sheet of the present invention has a large number of air bubbles whose diameter is smaller than the thickness of the adhesive layer. If the diameter of the bubbles is larger than the thickness of the adhesive layer, the adhesive strength will be weak.
【００２９】本発明の積層電磁鋼板は、製造方法を特に
限定されず、例えば、本発明の絶縁被膜付き電磁鋼板を
前記絶縁被膜同士が接着するように２枚以上積層した
後、前記発泡剤の分解開始温度以上の温度になるように
加熱加圧して、前記発泡剤の一部または全部を発泡させ
ることを特徴とする、本発明の積層電磁鋼板の製造方法
が好適に挙げられる。以下、本発明の積層電磁鋼板の製
造方法について説明する。The manufacturing method of the laminated electromagnetic steel sheet of the present invention is not particularly limited. For example, after laminating two or more sheets of the electromagnetic steel sheet with an insulating coating of the present invention so that the insulating coatings adhere to each other, A method for producing a laminated magnetic steel sheet according to the present invention, which is characterized in that a part or all of the foaming agent is foamed by heating and pressurizing to a temperature not lower than the decomposition start temperature. Hereinafter, a method for producing a laminated electromagnetic steel sheet of the present invention will be described.
【００３０】本発明の積層電磁鋼板の製造方法において
は、まず本発明の絶縁被膜付き電磁鋼板を前記絶縁被膜
同士が接着するように２枚以上積層する。ここで、本発
明の絶縁被膜付き電磁鋼板が、両面に絶縁被膜を有して
いる場合は、その両側に他の本発明の絶縁被膜付き電磁
鋼板を積層することができる。したがって、積層する両
端の２枚以外の絶縁被膜付き電磁鋼板を両面に絶縁被膜
を有するものとすることにより、所望の枚数を積層する
ことができる。In the method for manufacturing a laminated magnetic steel sheet according to the present invention, first, two or more sheets of the electromagnetic steel sheet with an insulating coating of the present invention are laminated so that the insulating coatings adhere to each other. Here, when the electrical steel sheet with an insulating coating of the present invention has an insulating coating on both sides, another electrical steel sheet with an insulating coating of the present invention can be laminated on both sides thereof. Therefore, a desired number of electromagnetic steel sheets with insulating coatings on both sides can be stacked by using electromagnetic steel sheets with insulating coatings other than the two sheets at both ends to be stacked.
【００３１】つぎに、前記発泡剤の分解開始温度以上の
温度になるように加熱加圧して、前記発泡剤の一部また
は全部を発泡させる。発泡剤を発泡させ、気泡を多数生
じさせることにより絶縁被膜を膨張させて、絶縁被膜同
士の間に隙間を生じさせることなく接着させることがで
きる。本発明の積層電磁鋼板の製造方法においては、加
熱温度は、用いられる発泡剤の分解開始温度以上であれ
ば特に限定されないが、用いられる接着性樹脂のガラス
転移温度または軟化温度以上であるのが好ましく、ま
た、接着性樹脂の分解温度以下であるのが好ましい。Next, a part or all of the foaming agent is foamed by applying heat and pressure to a temperature not lower than the decomposition start temperature of the foaming agent. By foaming the foaming agent and generating a large number of air bubbles, the insulating coating can be expanded, and the insulating coatings can be bonded to each other without creating a gap. In the method for producing a laminated magnetic steel sheet of the present invention, the heating temperature is not particularly limited as long as it is equal to or higher than the decomposition start temperature of the foaming agent used, but is preferably equal to or higher than the glass transition temperature or softening temperature of the adhesive resin used. Preferably, the temperature is not higher than the decomposition temperature of the adhesive resin.
【００３２】接着圧力は、０．０１ｋｇｆ／ｃｍ
2 （９．８１×１０2 Ｐａ）以上であるのが好ましく、
１ｋｇｆ／ｃｍ2 （９．８１×１０4 Ｐａ）以上である
のがより好ましく、５ｋｇｆ／ｃｍ2 （４．９０×１０
5 Ｐａ）以上であるのが特に好ましく、また、２０００
ｋｇｆ／ｃｍ2 （１．９６１×１０8 Ｐａ）以下である
のが好ましく、１０００ｋｇｆ／ｃｍ2 （９．８１×１
０7 Ｐａ）以下であるのがより好ましく、５００ｋｇｆ
／ｃｍ2 （４．９０×１０7 Ｐａ）以下であるのが特に
好ましい。本発明の積層電磁鋼板の製造方法によれば、
接着性樹脂を含有する絶縁被膜が膨張するため、従来の
加熱接着型電磁鋼板に比べて、より低い接着圧力で十分
な接着状態を実現することができる。加圧時間は、１０
〜１００００秒であるのが好ましい。The bonding pressure is 0.01 kgf / cm
2 (9.81 × 10 2 Pa) or more,
It is more preferably 1 kgf / cm 2 (9.81 × 10 4 Pa) or more, and 5 kgf / cm 2 (4.90 × 10 4 Pa).
5 Pa) or more.
kgf / cm 2 (1.961 × 10 8 Pa) or less, preferably 1000 kgf / cm 2 (9.81 × 1 Pa).
0 7 Pa) or less, more preferably 500 kgf
/ Cm 2 (4.90 × 10 7 Pa) or less. According to the method for producing a laminated magnetic steel sheet of the present invention,
Since the insulating coating containing the adhesive resin expands, a sufficient bonding state can be realized with a lower bonding pressure than that of a conventional heat-bonded electromagnetic steel sheet. Pressurization time is 10
It is preferably from 1 to 10,000 seconds.
【００３３】本発明の積層電磁鋼板の用途は、特に限定
されないが、積層鉄芯とするのが好ましい態様の一つで
ある。即ち、電磁鋼板を２枚以上積層してなる積層鉄芯
であって、各電磁鋼板の間に接着性樹脂を含有する接着
層を有し、該接着層が接着層の厚さより径の小さい気泡
を多数有する積層鉄芯は、本発明の一態様である。本発
明の積層電磁鋼板は、表面に接着性樹脂層があることを
利用して、更に加熱加圧してブロック化することが好ま
しいが、加熱加圧せずに他の方法（カシメ、溶接）によ
り積層固着して使用してもかまわない。本発明の積層電
磁鋼板は、電磁鋼板を加熱加圧により積層して得られる
ものなので、これを他の方法により積層固着する場合で
も、打抜き、積層回数の手間が少ないという利点があ
る。また、本発明の積層電磁鋼板の製造方法の用途は、
特に限定されないが、本発明の積層鉄芯の製造方法とす
るのが好ましい態様の一つである。即ち、本発明の絶縁
被膜付き電磁鋼板を前記絶縁被膜同士が接着するように
２枚以上積層した後、前記発泡剤の分解開始温度以上の
温度になるように加熱加圧して、前記発泡剤の一部また
は全部を発泡させることにより積層鉄芯を得ることを特
徴とする積層電磁鋼板の製造方法は、本発明の一態様で
ある。The application of the laminated electromagnetic steel sheet of the present invention is not particularly limited, but one of the preferable embodiments is to use a laminated iron core. That is, a laminated iron core formed by laminating two or more electromagnetic steel sheets, having an adhesive layer containing an adhesive resin between each of the electromagnetic steel sheets, and the adhesive layer having a diameter smaller than the thickness of the adhesive layer. Is an embodiment of the present invention. The laminated electromagnetic steel sheet of the present invention is preferably made into a block by further heating and pressurizing, utilizing the presence of the adhesive resin layer on the surface, but by another method (caulking, welding) without heating and pressurizing. It may be used by being fixedly laminated. The laminated electromagnetic steel sheet of the present invention is obtained by laminating electromagnetic steel sheets by heating and pressing. Therefore, even when laminating and fixing the electromagnetic steel sheets by another method, there is an advantage that the labor of punching and laminating is reduced. Further, the use of the manufacturing method of the laminated electromagnetic steel sheet of the present invention,
Although not particularly limited, one of the preferable embodiments is to use the method for producing a laminated iron core of the present invention. That is, after laminating two or more sheets of the electromagnetic steel sheet with an insulating coating of the present invention so that the insulating coatings adhere to each other, heat and pressure to a temperature equal to or higher than the decomposition start temperature of the blowing agent, One embodiment of the present invention is a method for producing a laminated magnetic steel sheet, in which a laminated iron core is obtained by partially or entirely foaming.
【００３４】[0034]
【実施例】以下に実施例を示して本発明を具体的に説明
するが、本発明はこれらに限られるものではない。 （実施例１〜１８および比較例１〜５）大きさ１５０ｍ
ｍ×３００ｍｍ、板厚０．５ｍｍの電磁鋼板（電気鉄
板）に、第１表に示すように、各種の発泡剤を所定の含
有量で含有する各種の水系の接着性樹脂をロールコータ
ーで塗布し、到達板温１８０℃で焼き付け、放冷して、
被膜厚さ５μｍの絶縁被膜を一方の表面に有する絶縁被
膜付き電磁鋼板を得た。つぎに、絶縁被膜付き電磁鋼板
を絶縁被膜同士が接着するように２枚積層した後、ホッ
トプレスを用いて、第１表に示す温度で、圧力１０ｋｇ
ｆ／ｃｍ2 （９．８１×１０5 Ｐａ）、時間１分の条件
で加熱加圧して接着させて、積層電磁鋼板を得た。EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples. (Examples 1 to 18 and Comparative Examples 1 to 5) 150 m in size
As shown in Table 1, various water-based adhesive resins containing various foaming agents at a predetermined content are applied to a magnetic steel sheet (electric iron sheet) having a size of mx 300 mm and a thickness of 0.5 mm using a roll coater. And bake at a plate temperature of 180 ° C, let it cool,
An electromagnetic steel sheet with an insulating coating having an insulating coating with a coating thickness of 5 μm on one surface was obtained. Next, after laminating two magnetic steel sheets with an insulating coating so that the insulating coatings adhere to each other, a hot press was performed at a temperature shown in Table 1 at a pressure of 10 kg.
The laminated electromagnetic steel sheet was obtained by applying heat and pressure under the conditions of f / cm 2 (9.81 × 10 5 Pa) for 1 minute and bonding.
【００３５】得られた各絶縁被膜付き電磁鋼板および各
積層電磁鋼板について、以下のようにして評価を行っ
た。 （１）接着強度 ２枚の絶縁被膜付き電磁鋼板（幅２０ｍｍ×長さ７０ｍ
ｍ）を、先端から１０ｍｍまでの部分で絶縁被膜同士が
接着するように、ずらして積層した後（ラップ部分：幅
２０ｍｍ×長さ１０ｍｍ）、ホットプレスを用いて、２
００℃で、圧力１０ｋｇｆ／ｃｍ2 （９．８１×１０5
Ｐａ）、時間１分の条件で加熱加圧して接着させ、試験
片を得た。この試験片について、引張速度３ｍｍ／ｍｉ
ｎの条件で室温で引張試験を行い、破断したときの最大
応力により接着強度を評価した。Each of the obtained magnetic steel sheets with an insulating coating and each of the laminated magnetic steel sheets was evaluated as follows. (1) Adhesive strength Two electromagnetic steel sheets with insulating coating (width 20 mm x length 70 m
m) is shifted and laminated so that the insulating coatings adhere to each other in a portion from the tip to 10 mm (wrap portion: width 20 mm × length 10 mm).
At 00 ° C., a pressure of 10 kgf / cm 2 (9.81 × 10 5
Pa) for 1 minute under heat and pressure to adhere to obtain a test piece. For this test piece, a tensile rate of 3mm / mi
A tensile test was performed at room temperature under the conditions of n, and the adhesive strength was evaluated based on the maximum stress at the time of breaking.
【００３６】（２）接着面の状態 積層電磁鋼板（５０ｍｍ×５０ｍｍ）について、接着し
た層間にクサビを打ち込んで接着面ではく離させ、接着
面の状態を目視により観察し、以下のように評価した。 ◎：ほぼ全面積が接着 ○：面積の９０％以上が接着 △：面積の７０％以上９０％未満が接着 ×：面積の７０％未満が接着(2) State of Adhesion Surface With respect to the laminated electromagnetic steel sheet (50 mm × 50 mm), a wedge was driven into the bonded layers to peel off the adhesion surface, and the state of the adhesion surface was visually observed and evaluated as follows. . ◎: Almost all area adhered ○: 90% or more of area adhered △: 70% to less than 90% of area adhered ×: Less than 70% of area adhered
【００３７】（３）気密性 上記で得られた一方の表面に絶縁被膜を有する絶縁被膜
付き電磁鋼板２枚と、上記と同様の条件で製造された被
膜厚さ５μｍの絶縁被膜を両方の表面に有する絶縁被膜
付き電磁鋼板３８枚との合計４０枚を、それぞれリング
状（外径１００ｍｍ、内径５０ｍｍ）に打ち抜いた後、
絶縁被膜同士が接着するように積層し、上記と同様の条
件で加熱加圧して、積層鉄芯を得た。つぎに、図４
（ａ）に模式的に示した、上記で得られた各積層鉄芯３
０について、図４（ｂ）に示すようにして気密性試験を
行った。積層鉄芯３０の上面および下面をステンレス製
のシール３１および３２でシールした。ただし、上面の
シール３１には、空気を送るための管３３を取り付け
た。ついで、シール後の積層鉄芯３０を水３４を入れた
容器に浸せきさせ、上面のシール３１に取り付けた管３
３から、圧縮空気を圧力が１ｋｇｆ／ｃｍ2 （９．８１
×１０4 Ｐａ）を保つように注入し、単位時間あたりに
積層鉄芯３０の側面から漏れた空気３５をメスシリンダ
ー３６に溜めて、その量を測定した。なお、いずれの積
層鉄芯３０についての試験においても、積層鉄芯３０と
上下のシール３１および３２との間からは空気は漏れて
いなかった。(3) Airtightness The two magnetic steel sheets provided with an insulating film having an insulating film on one surface obtained above and the insulating film having a coating thickness of 5 μm manufactured under the same conditions as described above were used on both surfaces. After punching out a total of 40 sheets of 38 electromagnetic steel sheets with insulating coatings in the form of a ring (outside diameter 100 mm, inside diameter 50 mm),
The insulating coatings were laminated so as to adhere to each other, and heated and pressed under the same conditions as above to obtain a laminated iron core. Next, FIG.
Each laminated iron core 3 obtained above, which is schematically shown in FIG.
For 0, an airtightness test was performed as shown in FIG. The upper and lower surfaces of the laminated iron core 30 were sealed with seals 31 and 32 made of stainless steel. However, a pipe 33 for sending air was attached to the seal 31 on the upper surface. Then, the laminated iron core 30 after sealing is immersed in a container containing water 34, and the pipe 3 attached to the seal 31 on the upper surface is immersed.
3, the pressure of compressed air was 1 kgf / cm 2 (9.81).
× 10 4 Pa), and air 35 leaking from the side surface of the laminated iron core 30 per unit time was collected in a measuring cylinder 36, and the amount was measured. In each of the tests on the laminated iron core 30, no air leaked from between the laminated iron core 30 and the upper and lower seals 31 and 32.
【００３８】接着強度、接着面の状態および気密性の評
価結果を第１表に示す。また、５−フェニルテトラゾー
ルを含有するアクリル系樹脂を用いたもの（実施例１〜
８ならびに比較例２および３）については、接着強度お
よび接着面の状態を図５にも示した。第１表および図５
から明らかなように、本発明の絶縁被膜付き電磁鋼板
（実施例１〜１８）は、積層して加熱加圧して接着させ
て、本発明の積層電磁鋼板や本発明の積層鉄芯とした場
合に、いずれも接着性に優れ、かつ、接着面の状態がよ
いことが分かる。なお、実施例１〜１８の積層電磁鋼板
について、接着層を接着面ではく離させた後に、電子顕
微鏡によりその断面を観察したところ、いずれも接着層
が接着層の厚さより径の小さい気泡を多数有していた。
これに対して、接着性樹脂が発泡剤を含有しない従来の
加熱接着型電磁鋼板（比較例１、４および５）は、接着
性が悪く、非接着部分が多かった。発泡剤の含有量が少
なすぎる場合（比較例２）も同様であった。また、発泡
剤の含有量が多すぎる場合（比較例３）は、接着強度に
劣っていた。Table 1 shows the evaluation results of the bonding strength, the state of the bonding surface, and the airtightness. Further, those using an acrylic resin containing 5-phenyltetrazole (Examples 1 to 5)
8 and Comparative Examples 2 and 3), the adhesive strength and the state of the adhesive surface are also shown in FIG. Table 1 and FIG.
As is clear from the above, when the magnetic steel sheets with insulating coatings of the present invention (Examples 1 to 18) were laminated, heated and pressed and bonded to obtain the laminated magnetic steel sheets of the present invention and the laminated iron core of the present invention In addition, it can be seen that all of them have excellent adhesiveness and the state of the adhesive surface is good. In addition, regarding the laminated electromagnetic steel sheets of Examples 1 to 18, after the adhesive layer was peeled off from the adhesive surface and the cross section thereof was observed by an electron microscope, it was found that all of the adhesive layers had many air bubbles smaller in diameter than the thickness of the adhesive layer. Had.
In contrast, the conventional heat-bonded electromagnetic steel sheets in which the adhesive resin did not contain a foaming agent (Comparative Examples 1, 4 and 5) had poor adhesion and had many non-bonded portions. The same was true when the content of the blowing agent was too small (Comparative Example 2). When the content of the foaming agent was too large (Comparative Example 3), the adhesive strength was poor.
【００３９】[0039]
【表１】 [Table 1]
【００４０】[0040]
【表２】 [Table 2]
【００４１】第１表中、各接着性樹脂の組成は、以下の
通りである。 アクリル系樹脂：アクリル樹脂８５質量％（ガラス転
移温度８０℃）、エポキシ樹脂１５質量％ エポキシ系樹脂：エポキシ樹脂８５質量％（軟化温度
７０℃）、フェノール樹脂１５質量％ アクリル／エポキシ系樹脂：アクリル樹脂４０質量％
（ガラス転移温度８０℃）、エポキシ樹脂３０質量％
（軟化温度７０℃）、フェノール樹脂３０質量％In Table 1, the composition of each adhesive resin is as follows. Acrylic resin: 85% by mass of acrylic resin (glass transition temperature 80 ° C), 15% by mass of epoxy resin Epoxy resin: 85% by mass of epoxy resin (70 ° C of softening temperature), 15% by mass of phenol resin Acrylic / epoxy resin: Acrylic 40% by mass of resin
(Glass transition temperature 80 ° C), epoxy resin 30% by mass
(Softening temperature 70 ° C), phenol resin 30% by mass
【００４２】[0042]
【発明の効果】本発明の絶縁被膜付き電磁鋼板は、積層
し加熱加圧した場合に、絶縁被膜同士が十分に密接に接
着しうる。また、本発明の積層電磁鋼板および本発明の
積層鉄芯は、接着層における接着性に優れる。更に、本
発明の積層電磁鋼板の製造方法および本発明の積層鉄芯
の製造方法によれば、本発明の積層電磁鋼板および本発
明の積層鉄芯を好適に製造することができる。According to the present invention, when laminated and subjected to heating and pressurization, the insulating steel sheets provided with the insulating coating can sufficiently adhere to each other. Further, the laminated electromagnetic steel sheet of the present invention and the laminated iron core of the present invention have excellent adhesiveness in the adhesive layer. Furthermore, according to the method for producing a laminated magnetic steel sheet of the present invention and the method for producing a laminated iron core of the present invention, it is possible to suitably produce the laminated electromagnetic steel sheet of the present invention and the laminated iron core of the present invention.
【図面の簡単な説明】[Brief description of the drawings]
【図１】 従来の加熱接着型電磁鋼板を積層し、加熱加
圧して得られる積層鉄芯における、接着性樹脂を含有す
る絶縁被膜の模式的な断面図である。FIG. 1 is a schematic cross-sectional view of an insulating coating containing an adhesive resin in a laminated iron core obtained by laminating a conventional heat-bonded electromagnetic steel sheet and applying heat and pressure.
【図２】 （ａ）は、従来の加熱接着型電磁鋼板を積層
してなる積層電磁鋼板の加熱加圧前後の状態を示す断面
模式図であり、（ｂ）は、本発明の絶縁被膜付き電磁鋼
板を積層してなる積層電磁鋼板の加熱加圧前後の状態を
示す断面模式図である。FIG. 2A is a schematic cross-sectional view showing a state before and after heating and pressing of a laminated electromagnetic steel sheet formed by laminating a conventional heat-bonded electromagnetic steel sheet, and FIG. FIG. 2 is a schematic cross-sectional view showing a state before and after heating and pressing of a laminated electromagnetic steel sheet formed by laminating electromagnetic steel sheets.
【図３】 発泡剤を昇温速度２℃／分で加熱した場合の
温度とガス発生量との関係を示すグラフである。3 is a graph showing the relationship between the temperature and the amount of gas generated when heating the blowing agent at a heating rate of 2 ° C. / min.
【図４】 （ａ）は、積層鉄芯の模式的な斜視図であ
り、（ｂ）は、積層鉄芯の気密性試験の説明図である。FIG. 4A is a schematic perspective view of a laminated iron core, and FIG. 4B is an explanatory diagram of an airtightness test of the laminated iron core.
【図５】 本発明の実施例および比較例の一部におけ
る、発泡剤含有量と接着強度および接着面の状態のそれ
ぞれとの関係を示す図である。FIG. 5 is a diagram showing the relationship between the content of a foaming agent, the bonding strength, and the state of the bonding surface in each of Examples and Comparative Examples of the present invention.
１ 積層鉄芯 ２、１２ 接着性樹脂被膜（接着性樹脂を含有する絶縁
被膜） ３、１３ 接着良好部分 ４、１４ 非接着部分 ５ コア割れ部分 １０ 従来の加熱接着型電磁鋼板 １１、２１ 電磁鋼板 ２０ 本発明の絶縁被膜付き電磁鋼板 ２２ 接着性樹脂および発泡剤を含有する絶縁被膜 ２３ 気泡 ３０ 積層鉄芯 ３１ 上面のシール ３２ 下面のシール ３３ 管 ３４ 水 ３５ 漏れた空気 ３６ メスシリンダーDESCRIPTION OF SYMBOLS 1 Laminated iron core 2, 12 Adhesive resin film (insulating film containing adhesive resin) 3, 13 Good adhesion part 4, 14 Non-adhesion part 5 Core cracking part 10 Conventional heat-bonded electromagnetic steel sheet 11, 21 Electromagnetic steel sheet Reference Signs List 20 magnetic steel sheet with insulating coating of the present invention 22 insulating coating containing adhesive resin and foaming agent 23 air bubble 30 laminated iron core 31 upper surface seal 32 lower surface seal 33 tube 34 water 35 leaked air 36 graduated cylinder
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｈ０１Ｆ 27/24 Ｃ０９Ｊ 5/08 // Ｃ０９Ｊ 5/08 201/00 201/00 Ｈ０１Ｆ 27/24 Ｑ (72)発明者 河野 正樹 岡山県倉敷市水島川崎通１丁目（番地な し） 川崎製鉄株式会社水島製鉄所内 (72)発明者 本田 厚人 岡山県倉敷市水島川崎通１丁目（番地な し） 川崎製鉄株式会社水島製鉄所内 Ｆターム(参考） 4D075 CA23 CA47 DA06 DB03 DC19 EA35 4F100 AB03A AB03C AK01B AK25B AK53B BA02 BA03 CA01B DJ01B DJ04B EJ202 EJ422 GB41 JG04B JK06 JL11B YY00B 4J040 DF021 EB021 EC001 EK031 HA196 HA326 HC14 HC18 HC20 HD17 KA37 LA02 LA06 NA19 NA21 PA22 PA30 5E041 AA02 BC05 CA02 CA04 HB11 HB14 NN05 NN18 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) H01F 27/24 C09J 5/08 // C09J 5/08 201/00 201/00 H01F 27/24 Q (72 ) Inventor Masaki Kono 1-chome, Mizushima-Kawasaki-dori, Kurashiki-shi, Okayama Pref. (Without address) Inside Mizushima Works, Kawasaki Steel Co., Ltd. F-term (reference) at Mizushima Works, Ltd. NA21 PA22 PA30 5E041 AA02 BC05 CA02 CA04 HB11 HB14 NN05 NN18
Claims (5)
膜を設けてなる絶縁被膜付き電磁鋼板であって、該絶縁
被膜が接着性樹脂および発泡剤を含有し、該発泡剤の含
有量が該接着性樹脂１００質量部に対して０．０１〜２
質量部である絶縁被膜付き電磁鋼板。1. An electromagnetic steel sheet with an insulating coating comprising an insulating coating on at least one surface of an electromagnetic steel sheet, wherein the insulating coating contains an adhesive resin and a foaming agent, and the content of the foaming agent is 0.01 to 2 with respect to 100 parts by mass of the adhesive resin
Magnetic steel sheet with insulating coating, which is a mass part.
鋼板であって、各電磁鋼板の間に接着性樹脂を含有する
接着層を有し、該接着層が接着層の厚さより径の小さい
気泡を多数有する積層電磁鋼板。2. A laminated electromagnetic steel sheet formed by laminating two or more electromagnetic steel sheets, having an adhesive layer containing an adhesive resin between each of the electromagnetic steel sheets, wherein the adhesive layer has a diameter larger than the thickness of the adhesive layer. Laminated electromagnetic steel sheet with many small bubbles.
であって、各電磁鋼板の間に接着性樹脂を含有する接着
層を有し、該接着層が接着層の厚さより径の小さい気泡
を多数有する積層鉄芯。3. A laminated iron core formed by laminating electromagnetic steel plates or two, have an adhesive layer containing an adhesive resin between the electromagnetic steel plates, diameter adhesive layer than the thickness of the adhesive layer Laminated iron core with many small bubbles.
前記絶縁被膜同士が接着するように２枚以上積層した
後、前記発泡剤の分解開始温度以上の温度になるように
加熱加圧して、前記発泡剤の一部または全部を発泡させ
ることにより積層電磁鋼板を得ることを特徴とする積層
電磁鋼板の製造方法。4. After laminating two or more sheets of the electromagnetic steel sheet with the insulating coating according to claim 1 so that the insulating coatings adhere to each other, heat and pressure are applied so that the temperature becomes equal to or higher than the decomposition start temperature of the foaming agent. Producing a laminated magnetic steel sheet by foaming a part or all of the foaming agent.
前記絶縁被膜同士が接着するように２枚以上積層した
後、前記発泡剤の分解開始温度以上の温度になるように
加熱加圧して、前記発泡剤の一部または全部を発泡させ
ることにより積層鉄芯を得ることを特徴とする積層鉄芯
の製造方法。5. A wherein after claim 1 wherein the insulating coating between the insulation coating with an electromagnetic steel sheet according to the stacked two or more sheets to adhere, heated and pressed so that the decomposition start temperature or higher of the blowing agent And producing a laminated iron core by foaming a part or all of the foaming agent.
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|---|---|---|---|
| JP2001054325A JP4572474B2 (en) | 2001-02-28 | 2001-02-28 | Electrical steel sheet with insulating coating with excellent adhesion |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001054325A JP4572474B2 (en) | 2001-02-28 | 2001-02-28 | Electrical steel sheet with insulating coating with excellent adhesion |
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| Publication Number | Publication Date |
|---|---|
| JP2002260910A true JP2002260910A (en) | 2002-09-13 |
| JP4572474B2 JP4572474B2 (en) | 2010-11-04 |
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|---|---|---|---|
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005031767A1 (en) * | 2003-09-26 | 2005-04-07 | Mitsui Chemicals, Inc. | Laminate of magnetic base material and method for production thereof |
| WO2006043612A1 (en) * | 2004-10-18 | 2006-04-27 | Nippon Steel Corporation | Heat resistant adhesive film and electromagnetic steel sheet with said heat resistant adhesive film, iron core using said electromagnetic steel sheet, and process for manufacturing the same. |
| WO2024053732A1 (en) * | 2022-09-08 | 2024-03-14 | 日本製鉄株式会社 | Laminated core and method for manufacturing laminated core |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04235286A (en) * | 1991-01-08 | 1992-08-24 | Kawasaki Steel Corp | Magnetic steel sheet having electric insulating film of good weldability |
-
2001
- 2001-02-28 JP JP2001054325A patent/JP4572474B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04235286A (en) * | 1991-01-08 | 1992-08-24 | Kawasaki Steel Corp | Magnetic steel sheet having electric insulating film of good weldability |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005031767A1 (en) * | 2003-09-26 | 2005-04-07 | Mitsui Chemicals, Inc. | Laminate of magnetic base material and method for production thereof |
| KR100756329B1 (en) * | 2003-09-26 | 2007-09-06 | 미쓰이 가가쿠 가부시키가이샤 | Laminate of magnetic base material and method for production thereof |
| US7976961B2 (en) | 2003-09-26 | 2011-07-12 | Nakagawa Special Steel Co., Ltd. | Laminate of magnetic substrates and method of manufacturing the same |
| WO2006043612A1 (en) * | 2004-10-18 | 2006-04-27 | Nippon Steel Corporation | Heat resistant adhesive film and electromagnetic steel sheet with said heat resistant adhesive film, iron core using said electromagnetic steel sheet, and process for manufacturing the same. |
| JPWO2006043612A1 (en) * | 2004-10-18 | 2008-05-22 | 新日本製鐵株式会社 | Heat-resistant adhesive coating, electrical steel sheet with heat-resistant adhesive coating coated thereon, iron core using the electrical steel sheet, and manufacturing method thereof |
| KR100921015B1 (en) * | 2004-10-18 | 2009-10-09 | 신닛뽄세이테쯔 카부시키카이샤 | Electromagnetic steel sheet with heat resistant adhesive insulating film |
| JP4860480B2 (en) * | 2004-10-18 | 2012-01-25 | 新日本製鐵株式会社 | Electrical steel sheet with heat-resistant adhesive coating coated with heat-resistant adhesive film, iron core using the electrical steel sheet, and manufacturing method thereof |
| WO2024053732A1 (en) * | 2022-09-08 | 2024-03-14 | 日本製鉄株式会社 | Laminated core and method for manufacturing laminated core |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4572474B2 (en) | 2010-11-04 |
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