JP2937734B2 - Method for producing surface-coated electrical steel sheet for heat bonding - Google Patents
Method for producing surface-coated electrical steel sheet for heat bondingInfo
- Publication number
- JP2937734B2 JP2937734B2 JP5204394A JP5204394A JP2937734B2 JP 2937734 B2 JP2937734 B2 JP 2937734B2 JP 5204394 A JP5204394 A JP 5204394A JP 5204394 A JP5204394 A JP 5204394A JP 2937734 B2 JP2937734 B2 JP 2937734B2
- Authority
- JP
- Japan
- Prior art keywords
- steel sheet
- resin
- component
- heat bonding
- coated
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Description
【0001】[0001]
【産業上の利用分野】本発明は、打ち抜き、剪断、プレ
ス加工後に加圧および加熱により接着して用いられる表
面被覆電磁鋼板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 a method for producing a surface-coated magnetic steel sheet which is used by being punched, sheared, pressed, bonded after being pressed and heated.
【0002】[0002]
【従来の技術】加圧および加熱によって接着する表面被
覆電磁鋼板に要求される特性としては、加圧・加熱接着
性、耐ブロッキング性、溶接性、打ち抜き性、剪断性、
プレス加工性および耐食性など数多く挙げられる。これ
らの諸要求を満たすために数多くの研究がなされ、加熱
接着用表面被覆電磁鋼板の被膜組成に関して多くの提案
がなされている。例えば、特公昭49−13318号公
報には、熱可塑性エポキシ樹脂とベンゾグアナミン樹脂
からなる被膜を有する接着用電磁鋼板が、特公昭52−
8998号公報には熱可塑性樹脂と熱硬化性樹脂の混合
樹脂(フェノキシ樹脂とメタノール変性メラミン樹脂の
混合樹脂、フェノキシ樹脂とベンゾグアナミン樹脂の混
合樹脂、フェノキシ樹脂、フェノール樹脂およびメラミ
ン樹脂からなる混合樹脂)からなる被膜を有する接着用
表面被覆電磁鋼板が、さらに、特開平2−38042号
公報には、熱可塑性アクリル樹脂、エポキシ樹脂および
エポキシ樹脂硬化剤からなる混合樹脂を被覆した鋼板が
開示されている。2. Description of the Related Art The characteristics required for a surface-coated electromagnetic steel sheet to be bonded by pressing and heating include pressure / heat bonding, blocking resistance, welding, punching, shearing, and the like.
Numerous examples include press workability and corrosion resistance. Numerous studies have been made to satisfy these requirements, and many proposals have been made regarding the coating composition of surface-coated electrical steel sheets for heat bonding. For example, Japanese Patent Publication No. 49-13318 discloses an adhesive magnetic steel sheet having a coating made of a thermoplastic epoxy resin and a benzoguanamine resin.
No. 8998 discloses a mixed resin of a thermoplastic resin and a thermosetting resin (a mixed resin of a phenoxy resin and a methanol-modified melamine resin, a mixed resin of a phenoxy resin and a benzoguanamine resin, a mixed resin of a phenoxy resin, a phenol resin and a melamine resin). JP-A-2-38042 discloses a steel sheet coated with a mixed surface resin composed of a thermoplastic acrylic resin, an epoxy resin and an epoxy resin curing agent. .
【0003】[0003]
【発明が解決しようとする課題】しかしながら、上述し
た方法で得られる接着用表面被覆電磁鋼板は、加圧加熱
接着後の常温における接着強度は良好なものの、高温下
の接着強度は必ずしも十分とはいえないものであった。
あるいは、十分な高温接着強度を得るために、接着時間
を長時間必要とする、もしくは接着後に熱処理する必要
があるなど、作業性に劣るものであった。具体的には、
特公昭49−13318号公報では、実施例から明らか
なように、130℃での接着強度が18kg/cm2 で
あり、しかも接着するために130℃で24時間の加圧
積層時間を要していた。また、特公昭52−8998号
公報では、十分な耐熱接着強度を得るために200℃で
3時間の加圧積層時間を要していた。特開平2−380
42号公報には、高温下での接着強度の記載がないが、
本発明者らの試験によると150℃においては接着性が
発現しなかった。However, the surface-coated electromagnetic steel sheet for bonding obtained by the above-described method has good bonding strength at room temperature after bonding under pressure and heat, but does not always have sufficient bonding strength at high temperatures. It couldn't be said.
Alternatively, in order to obtain a sufficient high-temperature adhesive strength, the workability is poor, such as requiring a long bonding time or a heat treatment after the bonding. In particular,
In Japanese Patent Publication No. 49-13318, as is clear from the examples, the adhesive strength at 130 ° C. is 18 kg / cm 2 , and a pressure lamination time of 24 hours at 130 ° C. is required for bonding. Was. In Japanese Patent Publication No. 52-8998, a pressure lamination time of 3 hours at 200 ° C. was required to obtain a sufficient heat-resistant adhesive strength. JP-A-2-380
No. 42 does not describe the adhesive strength under high temperature,
According to the test of the present inventors, at 150 ° C., no adhesiveness was exhibited.
【0004】本発明の目的は、トランスやモーターなど
の鉄心として用いられ、表面被膜を絶縁被膜として使用
する電磁鋼板を製造するにあたり、積層接着後に150
℃程度の高温環境下に晒された場合においても十分な接
着強度を発現し、かつ、この接着特性を短時間(1分程
度)の積層接着時間で達成し、さらに、耐ブロッキング
性など接着用表面被覆電磁鋼板に要求される他の特性を
も同時に満足する加熱接着用表面被覆電磁鋼板の製造方
法を提供することを目的とする。An object of the present invention is to manufacture an electromagnetic steel sheet which is used as an iron core of a transformer or a motor and uses a surface film as an insulating film.
It exhibits sufficient adhesive strength even when exposed to a high temperature environment of about ℃, and achieves this adhesive property in a short time (about 1 minute) for lamination, and furthermore, has an adhesive property such as blocking resistance. An object of the present invention is to provide a method for producing a surface-coated electrical steel sheet for heat bonding, which simultaneously satisfies other characteristics required for the surface-coated electrical steel sheet.
【0005】[0005]
【課題を解決するための手段】すなわち、本発明は、電
磁鋼板の少なくとも一方の表面に、(A)ガラス転移点
が80〜150℃で、分子中に、−OH、−COOH、
>NH、−NH2 、および>CH2 よりなる群から選ば
れる活性官能基を少なくとも一種以上含有するアクリル
系樹脂エマルジョン、(B)エポキシ樹脂および/また
はフェノール樹脂の水溶液あるいはエマルジョン、およ
び(C)加熱によりブロック基が解離して前記(A)成
分あるいは前記(A)および(B)の両成分と反応する
水性ブロックイソシアネート化合物を主成分とする水系
混合液を塗布し、前記(A)、(B)成分と前記(C)
成分との反応が焼付後の被膜のゲル化率(硬化度)が1
0〜90%の範囲になるように焼き付けることを特徴と
する加熱接着用表面被覆電磁鋼板の製造方法を提供する
ものである。That is, the present invention provides (A) a glass transition point of at least 80 to 150 ° C. on at least one surface of an electrical steel sheet, wherein —OH, —COOH,
> NH, -NH 2, and> acrylic resin emulsion of the active functional group selected from the group consisting of CH 2 containing at least one or more, (B) an aqueous solution or emulsion of the epoxy resin and / or phenolic resin, and (C) An aqueous mixed solution containing an aqueous blocked isocyanate compound as a main component, which reacts with the component (A) or both the components (A) and (B) by dissociation of the blocking group by heating, is applied. B) Component and the above (C)
The gelation rate (curing degree) of the coating after baking is 1 when the reaction with the components
An object of the present invention is to provide a method for producing a surface-coated magnetic steel sheet for heat bonding, which is baked so as to be in a range of 0 to 90%.
【0006】ここで、A成分およびB成分の固形分重量
比A/Bは50/50〜95/5であるのが好ましく、
焼付後の被膜の乾燥膜厚は0.5〜10μmであるのが
好ましい。Here, the weight ratio A / B of the solid components A and B is preferably 50/50 to 95/5.
The dried film thickness of the film after baking is preferably 0.5 to 10 μm.
【0007】[0007]
【作用】以下に本発明をさらに詳細に説明する。本発明
において用いる基板は電磁鋼板である。この電磁鋼板に
は予め絶縁被覆が施されていてもよい。なお、本発明に
用いる基板として電磁鋼板以外にも軟鋼板、ステンレス
鋼板ならびに、特殊鋼板の熱間圧延板および冷間圧延板
のいずれを使用しても、すなわち基地鋼板を特に限定し
なくても、本発明の効果を得ることができる。またこれ
らの鋼板表面にZn,Ni,SnまたはCrなどの金属
めっきやZn−Ni,Zn−FeまたはZn−Cuなど
の金属合金めっきが施されていても良く、さらに鋼板表
面に直接またはめっき表面にクロメートおよびボンデな
どの化成処理が施されていても良い。以上のように鋼板
表面の被覆の有無を特に限定するものではない。本発明
においては、この電磁鋼板の少なくとも一方の表面に下
記組成の樹脂液を塗布し、これを焼き付けて表面被覆を
形成する。The present invention will be described below in more detail. The substrate used in the present invention is an electromagnetic steel sheet. This electromagnetic steel sheet may be provided with an insulating coating in advance. In addition, as a substrate used in the present invention, in addition to a magnetic steel sheet, a mild steel sheet, a stainless steel sheet, and any of a hot-rolled sheet and a cold-rolled sheet of a special steel sheet, that is, the base steel sheet is not particularly limited. The effect of the present invention can be obtained. Further, the surface of these steel plates may be coated with metal plating such as Zn, Ni, Sn or Cr, or a metal alloy plating such as Zn-Ni, Zn-Fe or Zn-Cu. May be subjected to a chemical conversion treatment such as chromate and bond. As described above, the presence or absence of the coating on the steel sheet surface is not particularly limited. In the present invention, a resin solution having the following composition is applied to at least one surface of the magnetic steel sheet and baked to form a surface coating.
【0008】まず、本発明で用いる水系樹脂混合液につ
いて説明する。 (A)成分であるアクリル系樹脂エマルジョンとして
は、分子中に−OH、−COOH、>NH、−NH2 、
および>CH2 よりなる群から選ばれる活性官能基を含
有するものであればいかなるものも使用できる。具体例
としては、アクリル酸のアルキルエステルモノマー、メ
タクリル酸のアルキルエステルモノマー、スチレンモノ
マーなどの非官能性モノマーと、アクリル酸、メタクリ
ル酸、メタクリル酸ヒドロキシエチル、メタクリル酸ヒ
ドロキシプロピル、メタクリル酸第三ブチリアミノエチ
ルなどの官能性モノマーとのモノマー混合物を、混合の
結果得られるアクリル樹脂のガラス転移点が80〜15
0℃の範囲内になるように適宜組み合わせて、通常の乳
化重合法によって得ることができる。First, the aqueous resin mixture used in the present invention will be described. The acrylic resin emulsion as the component (A), -OH in the molecule, -COOH,> NH, -NH 2 ,
And any containing an active functional group selected from the group consisting of> CH 2 . Specific examples include alkyl ester monomers of acrylic acid, alkyl ester monomers of methacrylic acid, non-functional monomers such as styrene monomers, acrylic acid, methacrylic acid, hydroxyethyl methacrylate, hydroxypropyl methacrylate, tert-butyl methacrylate. The glass transition point of the acrylic resin obtained as a result of mixing the monomer mixture with a functional monomer such as aminoethyl is 80 to 15
It can be obtained by a usual emulsion polymerization method by appropriately combining them so as to be within the range of 0 ° C.
【0009】なお、ガラス転移点が80℃未満の場合に
は、得られる表面塗膜に粘着性が残り、被覆鋼板をコイ
ルとして巻き取る場合や積み重ねる場合などにブロッキ
ング現象が起きやすくなり、それに起因して塗膜が損傷
することがあるので好ましくない。一方、ガラス転移点
が150℃超の場合には、必然的に溶融、軟化する温度
が高くなることから、焼き付け温度を高く設定する必要
を生じ、後述する(C)成分の反応制御が困難になるこ
とがあるほか、積層接着温度の高温化をも必要とするた
め作業性を低下させるので好ましくない。If the glass transition point is lower than 80 ° C., the resulting surface coating film will remain sticky, and a blocking phenomenon will easily occur when the coated steel sheet is wound or stacked as a coil. It is not preferable because the coating film may be damaged. On the other hand, when the glass transition point is higher than 150 ° C., the temperature for melting and softening is inevitably high, so that it is necessary to set the baking temperature high, and it becomes difficult to control the reaction of the component (C) described later. In addition to the above, it is necessary to increase the lamination bonding temperature, which lowers the workability, which is not preferable.
【0010】(B)成分はエポキシ樹脂、フェノール樹
脂のいずれか、あるいは両方であってもよい。樹脂の形
態は水溶液、エマルジョンのいずれであってもよい。エ
ポキシ樹脂は、1分子中に2個以上のエポキシ基を含有
し、常温で液状、好ましくは固体状のものが使用でき
る。例えば、ビスフェノールA型、ハロゲン化ビスフェ
ノールA型、ノボラック型、ポリグリコール型、ビスフ
ェノールF型、エポキシ化油などが挙げられる。エポキ
シ樹脂エマルジョンは、これらのエポキシ樹脂を乳化剤
の存在下で通常の強制乳化法により製造することができ
る。フェノール樹脂は、汎用のノボラック型、レゾール
型などの水溶性フェノール樹脂あるいはフェノール樹脂
エマルジョンを使用することができる。The component (B) may be either an epoxy resin or a phenol resin, or both. The resin may be in the form of an aqueous solution or an emulsion. The epoxy resin contains two or more epoxy groups in one molecule, and can be used in a liquid state at room temperature, preferably in a solid state. For example, bisphenol A type, halogenated bisphenol A type, novolak type, polyglycol type, bisphenol F type, epoxidized oil and the like can be mentioned. The epoxy resin emulsion can be produced by a usual forced emulsification method of these epoxy resins in the presence of an emulsifier. As the phenol resin, a general-purpose novolak-type or resol-type water-soluble phenol resin or a phenol resin emulsion can be used.
【0011】(C)成分である水性ブロックイソシアネ
ート化合物は、焼き付け時および積層接着時の加熱によ
ってブロック基が解離され、(A)成分あるいは(B)
成分の分子中に含まれる活性官能基と反応して架橋結合
を形成するものであればいかなるものも使用できる。た
だし、本発明では、焼き付け時に架橋反応が不完全な状
態(ゲル化率10〜90%)になるように制御すること
を特徴とするため、ブロック基の解離温度が焼き付け温
度よりも著しく低いものは好ましくない。また、積層接
着時に完全に解離して架橋結合を形成することが望まし
い。解離温度の好適範囲は120〜200℃である。ブ
ロック基としては、アルコール類、εカプロラクタム、
フェノール、オキシムなどが使用できる。In the aqueous blocked isocyanate compound (C), the blocking group is dissociated by heating during baking and lamination bonding, and the component (A) or (B)
Any substance can be used as long as it reacts with an active functional group contained in the molecule of the component to form a crosslink. However, in the present invention, since the cross-linking reaction is controlled to be incomplete at the time of baking (gelation rate: 10 to 90%), the dissociation temperature of the block group is significantly lower than the baking temperature. Is not preferred. In addition, it is desirable to completely dissociate to form a cross-linking bond during lamination bonding. The preferred range of the dissociation temperature is 120 to 200 ° C. As the blocking group, alcohols, ε-caprolactam,
Phenol, oxime and the like can be used.
【0012】(C)成分の配合量は、(A)成分および
(B)成分の活性官能基の化学量論量近傍が好ましい。
あまりに過剰に配合した場合には、被覆鋼板を積層接着
して得た中間製品を溶接加工する際などに臭気を発生さ
せることがある。(C)成分配合量の好適範囲は、上記
化学量論量の−50〜+400%である。The amount of component (C) is preferably around the stoichiometric amount of the active functional groups of components (A) and (B).
If it is excessively mixed, an odor may be generated when welding an intermediate product obtained by laminating and bonding coated steel sheets. (C) A preferable range of the compounding amount is -50 to + 400% of the stoichiometric amount.
【0013】本発明で使用する被覆成分は、以上の
(A)、(B)および(C)成分を含むことを必須とす
るが、さらに必要に応じて、成膜助剤や絶縁性を有する
着色顔料、体質顔料、防錆顔料あるいは消泡剤、表面調
整剤、増粘剤、顔料分散剤、防腐剤などの各種添加剤を
配合したものであってもよい。各成分間の架橋反応を促
進するために、他の架橋剤や反応触媒を添加してもよ
い。さらに、樹脂の改質を目的に他の水性樹脂の混合や
共重合など当事者の公知技術を併用してもよい。(A)
〜(C)の各成分は、それぞれ同種の成分を複数用いた
ものであってもよい。It is essential that the coating component used in the present invention contains the above-mentioned components (A), (B) and (C), and if necessary, further has a film-forming aid and an insulating property. It may be a compound containing various additives such as a coloring pigment, an extender pigment, a rust preventive pigment or an antifoaming agent, a surface conditioner, a thickener, a pigment dispersant, and a preservative. Other cross-linking agents or reaction catalysts may be added to promote the cross-linking reaction between the components. Further, a technique known to those skilled in the art such as mixing and copolymerization of another aqueous resin may be used for the purpose of modifying the resin. (A)
Each of the components (C) to (C) may use a plurality of components of the same type.
【0014】なお、各樹脂成分(A)、(B)の混合比
には特に限定はないが、好適な樹脂固形分重量比は、
(A)/(B)=〔(50)/(50)〕〜〔(95)
/(5)〕である。(A)成分が前記範囲より少ないと
架橋密度の低下および高ガラス転移点の樹脂成分の配合
比過少によって凝集力が小さくなるため、高温下での接
着強度が低くなる。逆に(A)成分が前記範囲よりも多
い場合には、高温下での接着強度は向上するものの、
(A)成分の脆性的な機械特性の影響を受け、常温下で
の接着強度が低下することがある。また、(A)、
(B)成分の樹脂固形分は、塗装作業性などの観点か
ら、混合液中20〜60重量%の割合であることが好ま
しい。The mixing ratio of each of the resin components (A) and (B) is not particularly limited.
(A) / (B) = [(50) / (50)] to [(95)
/ (5)]. When the amount of the component (A) is less than the above range, the cohesive strength is reduced due to a decrease in the crosslinking density and an insufficient mixing ratio of the resin component having a high glass transition point, so that the adhesive strength at high temperatures is reduced. Conversely, when the component (A) is more than the above range, the adhesive strength at high temperatures is improved,
Due to the brittle mechanical properties of the component (A), the adhesive strength at room temperature may decrease. (A),
The resin solid content of the component (B) is preferably 20 to 60% by weight in the mixed solution from the viewpoint of coating workability and the like.
【0015】混合液を塗布する方法としては、ロールコ
ーター、カーテンフローコーター、スプレー塗装、スク
イズコーターなどの塗布方法が利用でき、特に限定され
ない。混合液の焼き付け方法としては、熱風乾燥炉、誘
導加熱炉、抵抗加熱炉などの公知の焼き付け炉が利用で
き、特に限定されない。As a method for applying the mixed liquid, a coating method such as a roll coater, a curtain flow coater, a spray coating, and a squeeze coater can be used, and is not particularly limited. As a method of baking the mixed solution, a known baking furnace such as a hot-air drying furnace, an induction heating furnace, or a resistance heating furnace can be used, and is not particularly limited.
【0016】混合液の塗布、焼き付け後の被膜の乾燥膜
厚は、0.5〜10μmが望ましい。膜厚が0.5μm
未満の場合には、接着強度が未達となることがあり、ま
た、膜厚が10μm超の場合には、接着強度が飽和する
ことにより非経済的となるほか、ブロッキングしやすく
なるなどの問題を生じることがある。The dry film thickness of the film after application and baking of the mixture is preferably 0.5 to 10 μm. 0.5 μm thick
If the thickness is less than 10 μm, the adhesive strength may not be achieved. If the thickness is more than 10 μm, the adhesive strength may be saturated, which may be uneconomical and may cause blocking. May occur.
【0017】焼き付け温度は到達板温で150〜450
℃が望ましい。150℃未満では、水性媒体の乾燥が不
十分となって接着時にふくれを生じたり、架橋反応の進
行が不十分となる(ゲル化率が10%未満)ことによっ
て、ブロッキングを生じたり、最終的な架橋反応率の到
達度が不十分となることに起因して接着強度の未達を招
くことがある。450℃超の場合には、焼き付け時に架
橋反応がほぼ完結してしまい(ゲル化率が90%超)、
積層接着時にはもはや溶融せず、接着しなくなることが
ある。焼き付け後の被膜のゲル化率の好適な範囲は30
〜85%、さらに好ましくは50〜80%である。The baking temperature is 150 to 450 in the ultimate plate temperature.
C is desirable. When the temperature is lower than 150 ° C., the aqueous medium is insufficiently dried to cause blistering at the time of adhesion, or the progress of the crosslinking reaction is insufficient (gelation rate is less than 10%), thereby causing blocking or ultimately. Inadequate achievement of a high crosslinking reaction rate may result in insufficient adhesion strength. When the temperature exceeds 450 ° C., the crosslinking reaction is almost completed at the time of baking (gelation rate exceeds 90%),
At the time of lamination bonding, it no longer melts and may not be bonded. The preferred range of the gelation rate of the film after baking is 30.
To 85%, more preferably 50 to 80%.
【0018】[0018]
【実施例】次に、本発明を実施例に基づいて具体的に説
明する。 (実施例1)2枚の電磁鋼板(板厚0.5mm、表面粗
さRa0.18μm)の各接着面に、表1に示す混合物
をロールコーターで塗布し、表2中に記載した到達板温
になるように熱風乾燥炉で60秒間焼き付け、乾燥後の
膜厚を5.0μmとした。剪断接着強度測定用の積層接
着電磁鋼板は、被膜を形成した電磁鋼板の接着面同士を
重ね合わせ、加圧10kg/cm2 で表2中に記載した
加熱温度、加圧時間でプレス接着して作製した。剪断接
着強度の測定は、得られた積層接着電磁鋼板をすぐに2
3℃および150℃の温度下で行なった。剪断接着強度
の結果を表2に示す。また、ブロッキング性の評価とし
て、被膜を形成した電磁鋼板の接着面同士を重ね合わ
せ、加圧200kg/cm2 のまま、80℃2日間エー
ジングさせた後の23℃下の剪断接着強度を測定した。
結果を表2に示す。Next, the present invention will be specifically described based on examples. (Example 1) The mixture shown in Table 1 was applied to each bonding surface of two electromagnetic steel sheets (sheet thickness 0.5 mm, surface roughness Ra 0.18 μm) using a roll coater. The film was baked in a hot air drying oven for 60 seconds so as to become warm, and the film thickness after drying was adjusted to 5.0 μm. The laminated adhesive electromagnetic steel sheet for measuring the shear adhesive strength was prepared by laminating the adhesive surfaces of the electromagnetic steel sheets having the coatings formed thereon, and press-bonding with a pressure of 10 kg / cm 2 at a heating temperature and a pressing time described in Table 2. Produced. The measurement of the shear adhesive strength was carried out by immediately applying the obtained laminated adhesive electromagnetic steel sheet to 2
The test was performed at a temperature of 3 ° C. and 150 ° C. Table 2 shows the results of the shear adhesive strength. In addition, as an evaluation of the blocking property, the adhesive surfaces of the magnetic steel sheets on which the coatings were formed were superimposed on each other, and after being aged at 80 ° C. for 2 days while maintaining the pressure at 200 kg / cm 2 , the shear adhesive strength at 23 ° C. was measured. .
Table 2 shows the results.
【0019】また、焼き付け後および積層接着後の被膜
の硬化度をゲル化率によって評価した。ゲル化率は、焼
き付け後の被覆鋼板あるいは積層接着後に剥離させた被
覆鋼板をソックスレー抽出器により、メチルエチルケト
ンを用いて2時間抽出を行なった後の残量から算出し
た。結果を表2に示す。なお、発明例1の被膜の焼き付
け前のゲル化率は0%、200℃で1時間焼き付けし、
完全に硬化させた場合には98%となり、ゲル化率の算
出法が概ね硬化度に対応していることが確認された。 ゲル化率=抽出後の被膜残重量/抽出前の被膜重量×1
00(%)The degree of cure of the coating after baking and after lamination was evaluated by the gelation rate. The gelation ratio was calculated from the remaining amount after extracting the coated steel sheet after baking or the coated steel sheet peeled off after laminating with methyl ethyl ketone for 2 hours using a Soxhlet extractor. Table 2 shows the results. The gelation ratio of the coating of Invention Example 1 before baking was 0%, and the coating was baked at 200 ° C. for 1 hour.
When it was completely cured, it was 98%, and it was confirmed that the method of calculating the gelation rate generally corresponded to the degree of curing. Gelation rate = residual weight of coating after extraction / weight of coating before extraction x 1
00 (%)
【0020】[0020]
【表1】 [Table 1]
【0021】[0021]
【表2】 [Table 2]
【0022】[0022]
【発明の効果】表2から明らかなように、本発明の加熱
接着用表面被覆電磁鋼板の剪断接着強度は、常温および
高温において高水準なものである。また、耐ブロッキン
グ性にも優れるものである。さらに高接着強度が短時間
の積層接着時間で達成されている。なお、焼き付け温度
の高温化および加熱積層接着時間の長時間化によって、
被膜のゲル化率および高温下での接着強度が増大してい
ることから、積層接着前の樹脂成分は、まだ架橋反応
(ゲル化率)が不完全な状態であることがわかる。As is clear from Table 2, the shear adhesive strength of the surface-coated magnetic steel sheet for heat bonding of the present invention is at a high level at normal temperature and high temperature. Also, it has excellent blocking resistance. Further, high adhesive strength is achieved with a short lamination time. In addition, by raising the baking temperature and prolonging the heating lamination time,
Since the gelation rate of the coating and the adhesive strength at high temperatures are increased, it is understood that the resin component before lamination and bonding is still in an incomplete cross-linking reaction (gelation rate).
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 FI B05D 7/14 B05D 7/14 H B29C 59/00 B29C 59/00 E C09D 133/02 C09D 133/02 163/00 163/00 175/04 175/04 // B32B 15/08 B32B 15/08 G B29K 33:00 63:00 (56)参考文献 特開 昭60−38069(JP,A) 特開 平6−57177(JP,A) 特開 平4−367766(JP,A) 特開 昭62−146985(JP,A) 特開 昭54−103433(JP,A) 特開 平3−157414(JP,A) 特開 平1−158079(JP,A) (58)調査した分野(Int.Cl.6,DB名) B05D 7/24 301 - 303 B05D 3/02 B05D 7/14 B29C 59/00 C09D 133/02 C09D 163/00 C09D 175/04 ──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. 6 Identification code FI B05D 7/14 B05D 7/14 H B29C 59/00 B29C 59/00 E C09D 133/02 C09D 133/02 163/00 163/00 175/04 175/04 // B32B 15/08 B32B 15/08 GB29K 33:00 63:00 (56) References JP-A-60-38069 (JP, A) JP-A-6-57177 (JP, A JP-A-4-367766 (JP, A) JP-A-62-146985 (JP, A) JP-A-54-103433 (JP, A) JP-A-3-157414 (JP, A) 158079 (JP, A) (58) Field surveyed (Int. Cl. 6 , DB name) B05D 7/24 301-303 B05D 3/02 B05D 7/14 B29C 59/00 C09D 133/02 C09D 163/00 C09D 175/04
Claims (3)
OH、−COOH、>NH、−NH2 、および>CH2
よりなる群から選ばれる活性官能基を少なくとも一種以
上含有するアクリル系樹脂エマルジョン、 (B)エポキシ樹脂および/またはフェノール樹脂の水
溶液あるいはエマルジョン、および (C)加熱によりブロック基が解離して前記(A)成分
あるいは前記(A)および(B)の両成分と反応する水
性ブロックイソシアネート化合物を主成分とする水系混
合液を塗布し、前記(A)、(B)成分と前記(C)成
分との反応が焼付後の被膜のゲル化率(硬化度)が10
〜90%の範囲になるように焼き付けることを特徴とす
る加熱接着用表面被覆電磁鋼板の製造方法。(1) At least one surface of an electromagnetic steel sheet has: (A) a glass transition point of 80 to 150 ° C.,
OH, -COOH,> NH, -NH 2, and> CH 2
An acrylic resin emulsion containing at least one or more active functional groups selected from the group consisting of: (B) an aqueous solution or emulsion of an epoxy resin and / or a phenol resin; and (C) a block group dissociated by heating to form the above (A) )) Or an aqueous mixed solution containing an aqueous blocked isocyanate compound as a main component which reacts with both the components (A) and (B), and coats the components (A) and (B) with the component (C). The gelation rate (curing degree) of the coating after baking is 10
A method for producing a surface-coated electrical steel sheet for heat bonding, characterized in that it is baked so as to be in the range of 90%.
は50/50〜95/5である請求項1に記載の加熱接
着用表面被覆電磁鋼板の製造方法。2. The solid content weight ratio of component A and component B, A / B.
The method for producing a surface-coated electromagnetic steel sheet for heat bonding according to claim 1, wherein the ratio is 50/50 to 95/5.
mである請求項1または2に記載の加熱接着用表面被覆
電磁鋼板の製造方法。3. The dried film thickness after baking is 0.5 to 10 μm.
The method for producing a surface-coated electromagnetic steel sheet for heat bonding according to claim 1 or 2, wherein m is m.
Priority Applications (1)
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JP5204394A JP2937734B2 (en) | 1994-03-23 | 1994-03-23 | Method for producing surface-coated electrical steel sheet for heat bonding |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP5204394A JP2937734B2 (en) | 1994-03-23 | 1994-03-23 | Method for producing surface-coated electrical steel sheet for heat bonding |
Publications (2)
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JPH07256206A JPH07256206A (en) | 1995-10-09 |
JP2937734B2 true JP2937734B2 (en) | 1999-08-23 |
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ID=12903798
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JP5204394A Expired - Fee Related JP2937734B2 (en) | 1994-03-23 | 1994-03-23 | Method for producing surface-coated electrical steel sheet for heat bonding |
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Cited By (1)
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RU2801189C1 (en) * | 2020-06-17 | 2023-08-03 | Ниппон Стил Корпорейшн | Electrical steel sheet coating composition, electrical steel sheet, laminated core and electric motor |
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WO2001074930A1 (en) * | 2000-04-04 | 2001-10-11 | Union Carbide Chemicals & Plastics Technology Corporation | Crosslinkable emulsion polymer compositions |
JP4143090B2 (en) * | 2003-02-03 | 2008-09-03 | 新日本製鐵株式会社 | Surface coated electrical steel sheet for bonding |
JP5469407B2 (en) * | 2009-08-11 | 2014-04-16 | 株式会社神戸製鋼所 | Adhesive resin composition-coated metal plate and method for producing the same |
KR102365884B1 (en) * | 2016-12-22 | 2022-02-21 | 제이에프이 스틸 가부시키가이샤 | Method of manufacturing electrical steel sheet with adhesive insulating coating and method of manufacturing stacked electrical steel sheet |
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1994
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Cited By (1)
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RU2801189C1 (en) * | 2020-06-17 | 2023-08-03 | Ниппон Стил Корпорейшн | Electrical steel sheet coating composition, electrical steel sheet, laminated core and electric motor |
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