JP2613726B2 - Manufacturing method of surface coated electrical steel sheet for bonding - Google Patents

Manufacturing method of surface coated electrical steel sheet for bonding

Info

Publication number
JP2613726B2
JP2613726B2 JP34286792A JP34286792A JP2613726B2 JP 2613726 B2 JP2613726 B2 JP 2613726B2 JP 34286792 A JP34286792 A JP 34286792A JP 34286792 A JP34286792 A JP 34286792A JP 2613726 B2 JP2613726 B2 JP 2613726B2
Authority
JP
Japan
Prior art keywords
steel sheet
weight
parts
insulating film
epoxy resin
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
JP34286792A
Other languages
Japanese (ja)
Other versions
JPH06182297A (en
Inventor
和年 竹田
喜久司 広瀬
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nippon Steel Corp filed Critical Nippon Steel Corp
Priority to JP34286792A priority Critical patent/JP2613726B2/en
Publication of JPH06182297A publication Critical patent/JPH06182297A/en
Application granted granted Critical
Publication of JP2613726B2 publication Critical patent/JP2613726B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Application Of Or Painting With Fluid Materials (AREA)
  • Laminated Bodies (AREA)

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【産業上の利用分野】本発明は、打ち抜き又は剪断加工
後、加工及び加熱により接着するための表面被覆電磁鋼
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 for bonding by punching or shearing, followed by processing and heating.

【0002】[0002]

【従来の技術】一般に、無方向性電磁鋼板の表面には、
渦電流損を低減するために鋼板表面に絶縁性の皮膜が形
成されている。そして、無方向性電磁鋼板をモーターや
トランスなどの電気機器などの鉄心に使用する場合は、
打ち抜き又は剪断加工後、積層し、さらに溶接、かし
め、接着剤により固着し、鉄心とするものである。
2. Description of the Related Art Generally, the surface of a non-oriented electrical steel sheet is
In order to reduce eddy current loss, an insulating film is formed on the surface of the steel sheet. And when using non-oriented electrical steel sheet for iron cores such as electric equipment such as motors and transformers,
After punching or shearing, they are laminated, then welded, caulked, and fixed with an adhesive to form an iron core.

【0003】しかし、かしめ又は溶接により固着する方
法では鋼板同士の絶縁性が低下したり、歪により磁気特
性が悪化するといった問題点がある。また、接着剤によ
り固着する方法では、小鉄片1枚毎に接着剤を塗布する
必要があり、それゆえ多大の時間と労力を要することか
ら作業効率が劣るという問題点がある。
[0003] However, the method of fixing by caulking or welding has a problem that the insulating properties between the steel sheets are reduced and the magnetic properties are deteriorated due to strain. Further, in the method of fixing with an adhesive, it is necessary to apply the adhesive to each piece of small iron, and therefore, there is a problem that a large amount of time and labor is required, resulting in poor work efficiency.

【0004】ところで、特公昭52−8999号公報及
び特公昭55−9815号公報などによって加圧及び加
熱により接着性を発揮する絶縁皮膜を用いて鉄心を固着
する技術が提案されている。すなわち、加圧及び加熱に
より接着性を発揮する絶縁皮膜を鋼板段階で塗布乾燥し
た後打ち抜き又は剪断加工し、さらに積層した後、加圧
加熱により固着して鉄心とするものである。
Meanwhile, Japanese Patent Publication No. 52-8999 and Japanese Patent Publication No. 55-9815 have proposed a technique for fixing an iron core using an insulating film exhibiting adhesiveness under pressure and heat. That is, an insulating film exhibiting adhesiveness under pressure and heat is applied and dried at the steel plate stage, punched or sheared, laminated, and then fixed by pressure and heat to form an iron core.

【0005】[0005]

【発明が解決しようとする課題】ところが、特公昭52
−8999号公報及び特公昭55−9815号公報に掲
示されている技術では、有機系の絶縁皮膜を鋼板に直接
塗布するものであるから、耐疵付き性が悪く、疵部分か
ら発錆したり、絶縁性が低下するという問題点があっ
た。すなわち、無方向性電磁鋼板を鉄心に加工する場
合、スリット、打ち抜き、積層などの各工程を経て製造
されるのであるが、特公昭52−8999号公報で示さ
れた、鋼板表面に、アクリル系樹脂水エマルジョンと水
溶性フェノール樹脂、水溶性メラミン樹脂との混合液を
均一に塗布乾燥し、塗膜を不完全状態に焼き付ける方法
では、皮膜の硬度が低く、スリッターや打ち抜きの送り
時に疵が付きやすいという問題点があった。
[Problems to be Solved by the Invention] However, Japanese Patent Publication No. Sho 52
In the technology disclosed in Japanese Patent Application Publication No. -8999 and Japanese Patent Publication No. 55-9815, an organic insulating film is directly applied to a steel sheet. In addition, there is a problem that the insulating property is reduced. That is, when a non-oriented electrical steel sheet is processed into an iron core, it is manufactured through various steps such as slitting, punching, and lamination. However, an acrylic-based steel sheet is disclosed in Japanese Patent Publication No. 52-8999. The method of uniformly applying and drying a mixture of a resin water emulsion, a water-soluble phenol resin, and a water-soluble melamine resin, and baking the coating film in an incomplete state, has low hardness of the coating film and causes scratches when sending slitters or punching. There was a problem that it was easy.

【0006】次に、特公昭55−9815号公報によっ
て、アクリル系樹脂エマルジョンに水溶性スチレン−マ
レイン酸共重合物を加えた処理液で鋼板表面に不完全焼
き付け状態の接着性皮膜を形成する方法が示されたが、
近年自動化の発展に伴い、鋼板はガイド上を滑るなどし
てさらに表面に疵が付きやすい状況となっていることか
ら、皮膜の硬度が高くなり、疵付きにくくなったとはい
え、未だ問題が解決したわけではなかった。
Next, according to Japanese Patent Publication No. 55-9815, a method of forming an incompletely baked adhesive film on the surface of a steel sheet with a treatment liquid obtained by adding a water-soluble styrene-maleic acid copolymer to an acrylic resin emulsion. Was shown,
In recent years, with the development of automation, steel sheets are more likely to have scratches on the surface, such as by sliding on guides, so the hardness of the coating has increased and the scratches are less likely to be scratched, but the problem is still solved I didn't.

【0007】また、機械化の進展に伴い、各工程を異な
る工場や場合によっては異なるメーカーで行う場合があ
り、各工程間に長期にわたる保存期間が存在するように
なり、そのため、絶縁皮膜に疵がある状態では、疵部分
から発錆したり、鋼板積層時に絶縁性が低下するといっ
た問題点があった。
[0007] Further, with the progress of mechanization, each process may be performed by a different factory or, depending on the case, by a different maker, and a long storage period exists between the processes. In a certain state, there were problems such as rusting from a flaw portion, and a decrease in insulation when laminating steel sheets.

【0008】本発明は、上記の問題について鋭意研究し
た結果なされたものであり、近年の自動化された工程に
対して鋼板に至る疵が付きにくく、発錆したり、積層時
に絶縁性が低下せず、かつ加熱加圧により優れた接着力
を発揮する接着用絶縁皮膜の製造方法を提供するもので
ある。
The present invention has been made as a result of intensive studies on the above-mentioned problems, and it has been found that, in recent automated processes, the steel plate is hardly flawed, rusts and insulation properties are reduced during lamination. An object of the present invention is to provide a method for producing an adhesive insulating film which exhibits excellent adhesive strength by heating and pressing.

【0009】[0009]

【課題を解決するための手段】上記課題を解決するため
の本発明の手段は、次のとおりである。すなわち、電磁
鋼板表面に無機系絶縁皮膜あるいは有機無機混合系絶縁
皮膜を形成した後、予め潜在性硬化剤を配合したアクリ
ル変成エポキシ樹脂エマルジョン100重量部(樹脂固
形分換算)に対し、熱可塑性アクリル樹脂エマルジョン
10〜300重量部(樹脂固形分換算)を主成分とした
処理液を均一に塗布し、不完全状態に焼き付けることを
特徴とする接着用表面被覆電磁鋼板の製造方法である。
Means of the present invention for solving the above problems are as follows. That is, after an inorganic insulating film or an organic-inorganic mixed insulating film is formed on the surface of an electromagnetic steel sheet, 100 parts by weight (in terms of resin solid content) of an acrylic modified epoxy resin emulsion containing a latent curing agent in advance is added to a thermoplastic acrylic resin. A method for producing a surface-coated electrical steel sheet for bonding, characterized by uniformly applying a treatment liquid containing 10 to 300 parts by weight (in terms of resin solid content) of a resin emulsion as a main component and baking it in an incomplete state.

【0010】以下、本発明の内容を詳細に説明する。本
発明では、まず鋼板表面に無機系絶縁皮膜あるいは、有
機無機混合系絶縁皮膜を形成する。ここでいう無機系絶
縁皮膜とは、りん酸塩又はクロム酸塩又は珪酸塩を主成
分とする皮膜を指し、有機無機混合系絶縁皮膜とは、上
記無機系絶縁皮膜中に有機樹脂を分散あるいは、微細析
出させたものである。これら皮膜の付着量については、
特に限定はしないが、0.2g/m2 〜3.0g/m2
が適当である。すなわち0.2g/m2 以下では、満足
できる耐蝕性が得られず、3.0g/m2 以上では、鋼
板との密着性が十分でないからである。また、皮膜形成
方法についてであるが、本発明においては、特に限定は
なく、無機系絶縁皮膜あるいは有機無機混合系絶縁皮膜
を形成する場合の常法に従い、鋼板表面に処理液をロー
ルコーターやスプレーなどで所定量均一に塗布し、乾燥
炉などで加熱乾燥することが望ましい。
Hereinafter, the contents of the present invention will be described in detail. In the present invention, first, an inorganic insulating film or an organic-inorganic mixed insulating film is formed on a steel sheet surface. Here, the inorganic insulating film refers to a film containing phosphate, chromate, or silicate as a main component, and the organic-inorganic mixed-type insulating film refers to an organic resin dispersed or dispersed in the inorganic insulating film. , Finely precipitated. Regarding the adhesion amount of these films,
Although not particularly limited, 0.2 g / m 2 to 3.0 g / m 2
Is appropriate. That is, if it is 0.2 g / m 2 or less, satisfactory corrosion resistance cannot be obtained, and if it is 3.0 g / m 2 or more, the adhesion to the steel sheet is not sufficient. The method for forming the film is not particularly limited in the present invention, and the treatment liquid is applied to the surface of the steel sheet by a roll coater or spraying according to a conventional method for forming an inorganic insulating film or an organic-inorganic mixed insulating film. It is desirable to apply a predetermined amount uniformly by using a method such as heating and drying in a drying oven or the like.

【0011】次に予め潜在性硬化剤を配合したアクリル
変成エポキシ樹脂エマルジョンとは、エポキシ樹脂に潜
在性硬化剤を配合し混合した後、アクリル樹脂を化学反
応させてエポキシ樹脂−潜在性硬化剤混合系を被覆し、
エマルジョンとしたものである。
An acrylic modified epoxy resin emulsion containing a latent curing agent in advance is a mixture of an epoxy resin with a latent curing agent, followed by a chemical reaction of the acrylic resin to mix the epoxy resin with the latent curing agent. Coating the system,
It was an emulsion.

【0012】ここでいうエポキシ樹脂とは、常温で液体
又は固体のものでモノマー中に2つ以上のエポキシ基を
有する樹脂で、具体的にはビスフェノールA型、ビスフ
ェノールF型、ビスフェノールAD型、ナフタレン型、
フェノールノボラック型、オルソクレゾールノボラック
型、グリシジルエステル型、脂環型などがある。
The term "epoxy resin" as used herein means a resin which is liquid or solid at room temperature and has two or more epoxy groups in a monomer. Specifically, bisphenol A type, bisphenol F type, bisphenol AD type, naphthalene Type,
There are phenol novolak type, orthocresol novolak type, glycidyl ester type, alicyclic type and the like.

【0013】また、エポキシ樹脂に配合される潜在性硬
化剤とは、通常のエポキシ樹脂硬化剤が、混合後速やか
に硬化反応が進行し、数時間から数日の可使時間しか持
たないのに対し、潜在性硬化剤では、数カ月間エポキシ
樹脂との混合中でも安定で、数カ月に及ぶ可使時間を持
つものをいう。このような潜在性硬化剤を用いてエポキ
シ樹脂を硬化させるには、混合系を加熱、加圧、加湿な
どの物理的あるいは化学的刺激を加えることにより、化
学反応が開始し硬化する。通常、硬化させるためには、
所定の温度に加熱するのが一般的である。
A latent curing agent to be added to an epoxy resin means that a curing reaction of a usual epoxy resin curing agent proceeds quickly after mixing, and the potting agent has a pot life of only several hours to several days. On the other hand, a latent curing agent is one that is stable during mixing with an epoxy resin for several months and has a pot life of several months. To cure an epoxy resin using such a latent curing agent, a chemical reaction is initiated and cured by applying a physical or chemical stimulus such as heating, pressurizing, or humidifying the mixed system. Usually, to cure,
Generally, heating to a predetermined temperature is performed.

【0014】具体的な潜在性硬化剤としては、ジシアン
ジアミド、メラミン、有機酸ジヒドラジド、アミンイミ
ド、ケテミン、第三アミン塩、アミダゾール塩、3フッ
化ホウ素アミン塩、マイクロカプセル型硬化剤、モリキ
ュラーシーブ型硬化剤が挙げられる。
Specific latent curing agents include dicyandiamide, melamine, organic acid dihydrazide, amine imide, ketamine, tertiary amine salts, amidazole salts, boron trifluoride amine salts, microcapsule type curing agents, and molecular sieve type Curing agents.

【0015】ここでいうマイクロカプセル型硬化剤と
は、通常の硬化剤をカゼインなどで形成したマイクロカ
プセル中に封入したもので、加熱あるいは加圧によっ
て、マイクロカプセルを破ることによりエポキシ樹脂と
硬化剤が混合し、硬化反応が進行するもでのある。
The term "microcapsule type curing agent" as used herein means an ordinary curing agent encapsulated in a microcapsule formed of casein or the like, and the epoxy resin and the curing agent are broken by heating or pressing to break the microcapsules. Are mixed and the curing reaction proceeds.

【0016】さらに、モレキュラーシーブ型硬化剤と
は、モレキュラーシーブなどの吸着性化合物の表面に硬
化剤を吸着せしめたもので、加熱、加湿することによ
り、吸着分子を放出させ、速やかに硬化反応を進行させ
るものである。
Further, the molecular sieve type curing agent is a substance in which a curing agent is adsorbed on the surface of an adsorptive compound such as a molecular sieve, and by heating and humidifying, adsorbed molecules are released, and the curing reaction is promptly performed. Let it progress.

【0017】また、本発明では、一般的には潜在性硬化
剤に分類されていないが、エポキシ樹脂との混合系が常
温において長期保存が可能であり、加熱することによ
り、硬化反応が進行することから、ブロックイソシアネ
ート、メラミン樹脂、ユリア樹脂、レゾール型フェノー
ル樹脂、アクリル樹脂、ナイロン、キシレン樹脂なども
使用できる。
In the present invention, although not generally classified as a latent curing agent, a mixed system with an epoxy resin can be stored for a long time at room temperature, and the curing reaction proceeds by heating. For this reason, block isocyanates, melamine resins, urea resins, resole-type phenol resins, acrylic resins, nylons, xylene resins and the like can also be used.

【0018】なお、本発明においては、必ずしも完全な
未反応である必要はなく、不完全反応状態が化学的に安
定化するのであれば、多少硬化反応が進行するものでも
よい。
In the present invention, it is not always necessary for the reaction to be completely unreacted, and the curing reaction may proceed to some extent as long as the incompletely reacted state is chemically stabilized.

【0019】さらに本発明では、上記エポキシ樹脂とエ
ポキシ樹脂硬化剤の混合系にアクリル樹脂を変成させる
ものである。ここでいう変成とは、エポキシ樹脂とエポ
キシ樹脂硬化剤混合物の表面に、化学的にアクリル樹脂
を結合させることをいう。このような変成に供するアク
リル樹脂としては、メタクリル酸、メタクリル酸エステ
ル、アクリル酸、アクリル酸エステル、スチレン、酢酸
ビニルなどの1種もしくは2種以上を重合あるいは、共
重合せしめたものである。しかる後に、上記化合物をエ
マルジョン化するのであるが、エマルジョン化の方法と
しては特に制限はなく、通常の乳化法によりエマルジョ
ンとしたものや、あるいは自己分散型のアクリル樹脂を
用いてもよい。
Further, in the present invention, an acrylic resin is modified into a mixed system of the epoxy resin and the epoxy resin curing agent. The term "modification" used herein means that an acrylic resin is chemically bonded to the surface of a mixture of an epoxy resin and an epoxy resin curing agent. As the acrylic resin to be subjected to such modification, one or two or more of methacrylic acid, methacrylic acid ester, acrylic acid, acrylic acid ester, styrene, vinyl acetate and the like are polymerized or copolymerized. Thereafter, the above compound is emulsified. There is no particular limitation on the method of emulsification, and an emulsion obtained by a normal emulsification method or a self-dispersion type acrylic resin may be used.

【0020】次に本発明で使用する熱可塑性アクリル樹
脂エマルジョンとは、アクリル酸、アクリル酸エステ
ル、メタクリル酸、メタクリル酸エステルなどの重合物
及びこれらにさらに酢酸ビニル、スチレン、ブタジエン
などを共重合させたエマルジョンの1種又は2種以上が
使用できる。エマルジョン化の方法については、上記同
様特に制限はなく、通常の乳化法によりエマルジョンと
したものや、あるいは自己分散型のアクリル樹脂を用い
てもよい。
Next, the thermoplastic acrylic resin emulsion used in the present invention is a polymer such as acrylic acid, acrylic acid ester, methacrylic acid, methacrylic acid ester and the like, and further copolymerized with vinyl acetate, styrene, butadiene and the like. One or more emulsions can be used. The method of emulsification is not particularly limited as described above, and an emulsion obtained by a normal emulsification method or a self-dispersion type acrylic resin may be used.

【0021】なお、本発明における処理液には、上記化
合物以外に成膜助剤、着色顔料、ガラス成形剤、分散性
向上剤、消泡剤などの各種添加剤を配合してもよい。
In the treatment liquid of the present invention, various additives such as a film forming aid, a coloring pigment, a glass forming agent, a dispersibility improver, and an antifoaming agent may be blended in addition to the above compounds.

【0022】また、エポキシ樹脂と潜在性エポキシ樹脂
硬化剤の配合割合は、エポキシ樹脂の種類、硬化剤の種
類により大きく変動するのであるが、通常エポキシ樹脂
100重量部に対し、2〜1000重量部が適当で、さ
らに変成するアクリル樹脂量はエポキシ樹脂100重量
部に対し、5〜300重量部が適当である。
The mixing ratio of the epoxy resin and the latent epoxy resin curing agent greatly varies depending on the type of the epoxy resin and the type of the curing agent. Usually, 2 to 1000 parts by weight based on 100 parts by weight of the epoxy resin. An appropriate amount of the denatured acrylic resin is 5 to 300 parts by weight based on 100 parts by weight of the epoxy resin.

【0023】潜在性硬化剤含有アクリル変成エポキシ樹
脂エマルジョンと熱可塑性アクリル樹脂エマルジョンの
配合比については、前記固形分100重量部に対し、後
記熱可塑性アクリル樹脂エマルジョンが固形分換算で1
0〜300重量部必要である。これは10重量部以下で
は、常温における接着力が低く、300重量部以上で
は、高温時の接着力が確保できないためである。
With respect to the blending ratio of the latent modified hardener-containing acrylic modified epoxy resin emulsion and the thermoplastic acrylic resin emulsion, the thermoplastic acrylic resin emulsion to be described later is converted to a solid content of 1 to 100 parts by weight of the solid content.
0 to 300 parts by weight are required. This is because if the amount is less than 10 parts by weight, the adhesive force at room temperature is low, and if it is more than 300 parts by weight, the adhesive force at a high temperature cannot be secured.

【0024】このような組成範囲で、無機系あるいは有
機無機混合系絶縁皮膜を施された鋼板表面に対しても優
れた接着力を持つ接着用皮膜を形成できる処理液が得ら
れる。
In such a composition range, a treatment liquid capable of forming an adhesive film having excellent adhesive strength even on the surface of a steel sheet provided with an inorganic or organic / inorganic mixed-type insulating film can be obtained.

【0025】次に、接着用皮膜処理液の塗布、乾燥方法
であるが、まず無機系あるいは有機無機混合系絶縁皮膜
を施された鋼板表面に処理液をロールコーターなどで所
定量塗布し、常温乾燥、又は加熱乾燥するが、本発明で
は不完全に焼き付けることが必須であり、通常は、10
0℃〜300℃の炉温で10秒〜90秒間乾燥するのが
工業的に好ましい。ここでいう不完全焼き付け状態と
は、ベトツキやブロッキングの発生がなく、しかも剪断
加工し、積層した後、加圧加熱することにより、接着す
る状態のことである。
Next, the method of applying and drying the adhesive coating treatment liquid is as follows. First, a predetermined amount of the treatment liquid is applied to the surface of the steel sheet provided with the inorganic or organic / inorganic mixed-type insulating coating using a roll coater or the like, Although drying or heating drying is required, incomplete baking is essential in the present invention.
It is industrially preferable to dry at a furnace temperature of 0 ° C to 300 ° C for 10 seconds to 90 seconds. The incompletely baked state referred to here is a state in which there is no stickiness or blocking, and further, the layers are bonded by shearing, laminating, and then heating under pressure.

【0026】次に電磁鋼板の表面に形成する接着用絶縁
皮膜量は特に限定しないが、4g/m2 〜12g/m2
の範囲が適当である。4g/m2 未満では十分な接着性
が得られず、一方12g/m2 を超えると、占積率が劣
るため好ましくないからである。
Next, the amount of the adhesive insulating film formed on the surface of the magnetic steel sheet is not particularly limited, but is 4 g / m 2 to 12 g / m 2.
Is appropriate. If it is less than 4 g / m 2 , sufficient adhesiveness cannot be obtained, while if it exceeds 12 g / m 2 , the space factor is inferior, which is not preferable.

【0027】本発明においては、電磁鋼板表面に無機系
あるいは有機無機混合系絶縁皮膜を施しているので、疵
が付きにくく、発錆したり、絶縁性が低下することがな
い。さらに、潜在性硬化剤含有アクリル変成エポキシ樹
脂エマルジョンと熱可塑性アクリル樹脂エマルジョンを
所定の割合で配合した処理液を用いて形成した接着用皮
膜により、従来の接着皮膜に比べて格段に優れた接着力
を達成している。
In the present invention, since an inorganic or organic-inorganic mixed insulating film is applied to the surface of the magnetic steel sheet, it is hardly flawed, and rust does not occur and the insulating property does not decrease. Furthermore, due to the adhesive film formed using a treatment liquid that contains a latent curing agent-containing acrylic modified epoxy resin emulsion and a thermoplastic acrylic resin emulsion in a prescribed ratio, the adhesive strength is much better than conventional adhesive films. Have achieved.

【0028】従来の接着用皮膜では、無機系あるいは有
機無機混合系絶縁皮膜を施している鋼板では、十分な接
着力が達成できず、本発明により初めて十分な接着強度
が達成できた理由については、明らかではないが、従来
の接着用皮膜では接着用皮膜と無機系あるいは有機無機
混合系絶縁皮膜や鋼板の線膨張係数の違いにより、加熱
加圧した後、無機系あるいは有機無機混合系絶縁皮膜に
歪みが加わることにより、無機系あるいは有機無機混合
系絶縁皮膜と鋼板との間で、剥離が生じて接着力が低下
するのに対し、本発明により形成された接着用皮膜で
は、エポキシ樹脂に予め硬化剤を配合することにより、
硬化時の体積変化を最小にすることが可能で、さらに柔
軟な熱可塑性アクリル樹脂がエポキシ樹脂の間を埋める
いわゆる島状構造をとるためではないかと推定される。
With the conventional adhesive coating, a steel sheet provided with an inorganic or organic-inorganic mixed type insulating film cannot achieve a sufficient adhesive strength. The reason why the present invention can achieve a sufficient adhesive strength for the first time is as follows. Although it is not clear, in the conventional adhesive coating, due to the difference between the adhesive coating and the inorganic or organic-inorganic mixed insulating coating or the linear expansion coefficient of the steel sheet, after heating and pressing, the inorganic or organic-inorganic mixed insulating coating By applying a strain to the inorganic or organic-inorganic mixed insulating film and the steel sheet, peeling occurs and the adhesive strength decreases, whereas the adhesive film formed according to the present invention uses an epoxy resin. By compounding a curing agent in advance,
It is presumed that the change in volume during curing can be minimized, and that a more flexible thermoplastic acrylic resin forms a so-called island-like structure that fills the space between epoxy resins.

【0029】[0029]

【実施例】次に本発明の実施例及び比較例を説明する。
まず、電磁鋼板(板厚0.5mm、表面粗さRa0.20
μm)の表面に、重クロム酸マグネシウムとアクリル樹
脂エマルジョン及びエチレングリコールを主成分とする
有機無機混合系皮膜用処理液を塗布しゴムロールで絞
り、450℃に設定した乾燥炉で60秒間焼き付け、付
着量を1g/m2 とした。ここで、有機無機混合皮膜を
形成した鋼板と形成しない鋼板の双方に次に記した処理
液を塗布しゴムロールで絞り、150℃に設定した乾燥
炉で60秒間焼き付け、付着量を7g/m2 とした。
Next, examples of the present invention and comparative examples will be described.
First, an electromagnetic steel sheet (sheet thickness 0.5 mm, surface roughness Ra 0.20
μm) is coated with a treatment liquid for an organic-inorganic mixed film containing magnesium dichromate, an acrylic resin emulsion and ethylene glycol as main components, squeezed with a rubber roll, baked in a drying oven set at 450 ° C. for 60 seconds, and adhered. The amount was 1 g / m 2 . Here, the following treatment liquid was applied to both the steel sheet on which the organic-inorganic mixed film was formed and the steel sheet on which the organic-inorganic mixed film was not formed, squeezed with a rubber roll, baked in a drying furnace set at 150 ° C. for 60 seconds, and the adhesion amount was 7 g / m 2. And

【0030】 〔処理液1〕 水 200重量部 20%潜在性硬化剤混合アクリル変成エポキシ樹脂エマルジョン100重量部 50%熱可塑性アクリル樹脂エマルジョン 100重量部[Treatment Solution 1] Water 200 parts by weight 20% latent curing agent mixed acrylic modified epoxy resin emulsion 100 parts by weight 50% thermoplastic acrylic resin emulsion 100 parts by weight

【0031】 〔処理液2〕 水 200重量部 20%潜在性硬化剤混合アクリル変成エポキシ樹脂エマルジョン100重量部 50%熱可塑性アクリル樹脂エマルジョン 50重量部[Treatment Liquid 2] Water 200 parts by weight 20% latent curing agent mixed acrylic modified epoxy resin emulsion 100 parts by weight 50% thermoplastic acrylic resin emulsion 50 parts by weight

【0032】 〔処理液3〕 水 200重量部 20%潜在性硬化剤混合アクリル変成エポキシ樹脂エマルジョン100重量部 50%熱可塑性アクリル樹脂エマルジョン 2重量部[Treatment Liquid 3] Water 200 parts by weight 20% latent curing agent mixed acrylic modified epoxy resin emulsion 100 parts by weight 50% thermoplastic acrylic resin emulsion 2 parts by weight

【0033】 〔処理液4〕 水 300重量部 50%アクリル樹脂エマルジョン 50重量部 スチレン−マレイン酸共重合物 25重量部[Treatment Liquid 4] Water 300 parts by weight 50% acrylic resin emulsion 50 parts by weight Styrene-maleic acid copolymer 25 parts by weight

【0034】 〔処理液5〕 水 100重量部 50%アクリル樹脂エマルジョン 100重量部 50%エポキシ樹脂エマルジョン 50重量部 アミン系エポキシ硬化剤 5重量部[Treatment Liquid 5] Water 100 parts by weight 50% acrylic resin emulsion 100 parts by weight 50% epoxy resin emulsion 50 parts by weight Amine epoxy curing agent 5 parts by weight

【0035】以上の処理液と実施例と比較例の関係及び
結果を表1に示す。
Table 1 shows the relationship between the treatment liquid, the examples and the comparative examples, and the results.

【0036】[0036]

【表1】 [Table 1]

【0037】表1からも明らかな如く、本実施例によれ
ば、従来と同等の優れた接着力を有し、さらに疵が付い
た後の耐蝕性と電気絶縁性に優れた接着性の電気絶縁皮
膜を有する電磁鋼板が得られた。
As is clear from Table 1, according to the present embodiment, the adhesive electric power has the same excellent adhesive strength as the conventional one, and further has excellent corrosion resistance and electrical insulation after being flawed. An electromagnetic steel sheet having an insulating film was obtained.

【0038】[0038]

【発明の効果】以上詳述した如く、本発明方法によれ
ば、従来と同等の優れた接着力を有し、さらに疵がつい
た後の耐蝕性と電気絶縁性に優れた接着性の電気絶縁皮
膜を有する電磁鋼板が得られるものである。
As described above in detail, according to the method of the present invention, it has the same excellent adhesive strength as that of the conventional method, and further has the excellent adhesive strength after being flawed. An electromagnetic steel sheet having an insulating film is obtained.

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】 電磁鋼板表面に無機系絶縁皮膜あるいは
有機無機混合系絶縁皮膜を形成した後、予め潜在性硬化
剤を配合したアクリル変成エポキシ樹脂エマルジョン1
00重量部(樹脂固形分換算)に対し、熱可塑性アクリ
ル樹脂エマルジョン10〜300重量部(樹脂固形分換
算)を主成分とした処理液を均一に塗布し、不完全状態
に焼き付けることを特徴とする接着用表面被覆電磁鋼板
の製造方法。
1. An acrylic modified epoxy resin emulsion 1 in which an inorganic insulating film or an organic-inorganic mixed insulating film is formed on the surface of an electromagnetic steel sheet, and a latent curing agent is previously blended.
A processing liquid containing 10 to 300 parts by weight (in terms of resin solids) of a thermoplastic acrylic resin emulsion as a main component is uniformly applied to 00 parts by weight (in terms of resin solids), and baking is performed in an incomplete state. Of manufacturing surface coated electromagnetic steel sheet for bonding.
JP34286792A 1992-12-22 1992-12-22 Manufacturing method of surface coated electrical steel sheet for bonding Expired - Lifetime JP2613726B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP34286792A JP2613726B2 (en) 1992-12-22 1992-12-22 Manufacturing method of surface coated electrical steel sheet for bonding

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP34286792A JP2613726B2 (en) 1992-12-22 1992-12-22 Manufacturing method of surface coated electrical steel sheet for bonding

Publications (2)

Publication Number Publication Date
JPH06182297A JPH06182297A (en) 1994-07-05
JP2613726B2 true JP2613726B2 (en) 1997-05-28

Family

ID=18357117

Family Applications (1)

Application Number Title Priority Date Filing Date
JP34286792A Expired - Lifetime JP2613726B2 (en) 1992-12-22 1992-12-22 Manufacturing method of surface coated electrical steel sheet for bonding

Country Status (1)

Country Link
JP (1) JP2613726B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004070080A1 (en) * 2003-02-03 2004-08-19 Nippon Steel Corporation Flat rolled magnetic steel sheet or strip having its surface coated for bonding

Also Published As

Publication number Publication date
JPH06182297A (en) 1994-07-05

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