JPH06102834B2 - Treatment liquid composition for production of electrical steel sheet having insulating coating - Google Patents
Treatment liquid composition for production of electrical steel sheet having insulating coatingInfo
- Publication number
- JPH06102834B2 JPH06102834B2 JP2266041A JP26604190A JPH06102834B2 JP H06102834 B2 JPH06102834 B2 JP H06102834B2 JP 2266041 A JP2266041 A JP 2266041A JP 26604190 A JP26604190 A JP 26604190A JP H06102834 B2 JPH06102834 B2 JP H06102834B2
- Authority
- JP
- Japan
- Prior art keywords
- treatment liquid
- steel sheet
- insulating coating
- liquid composition
- coating
- 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
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Description
【発明の詳細な説明】 産業上の利用分野 本発明は、絶縁被膜を有する電磁鋼板の製造のための処
理液組成物に関し、詳しくは、電磁鋼板の表面に絶縁被
膜を施す際の作業性及び得られた電磁鋼板のスリツト加
工時の皮膜密着性にすぐれると共に、積層コアーの溶接
時に臭気の少ない絶縁被膜を形成し得る電磁鋼板の製造
のための処理液組成物に関する。Description: TECHNICAL FIELD The present invention relates to a treatment liquid composition for producing an electromagnetic steel sheet having an insulating coating, and more specifically, to workability in applying an insulating coating to the surface of an electromagnetic steel sheet and The present invention relates to a treatment liquid composition for producing an electromagnetic steel sheet which has excellent film adhesion at the time of slitting the obtained electromagnetic steel sheet and can form an insulating film having less odor when welding a laminated core.
従来の技術 家庭用電気製品等のモーター、トランス等の鉄心に用い
られる電磁鋼板には、渦電流損を低減するために、一般
に、絶縁被膜が施されており、通常、これら電磁鋼板
は、所定の形状に打抜いた後、そのまま、又は歪取り焼
鈍を行なつた後、多数を積層し、端面を溶接して、鉄心
に組み立てられる。従つて、このような絶縁被膜は、電
気絶縁性と皮膜密着性にすぐれることは勿論、打抜き
性、耐熱性、耐食性、耐油性、耐溶剤性等にすぐれ、更
に、占積率の高いことが要求される。2. Description of the Related Art Magnetic steel sheets used for iron cores of motors, transformers, etc. of household electric appliances are generally provided with an insulating coating to reduce eddy current loss. After punching into the shape of, or after performing stress relief annealing, a large number of layers are laminated and the end faces are welded to be assembled into an iron core. Therefore, such an insulating coating is not only excellent in electrical insulation and coating adhesion, but also excellent in punchability, heat resistance, corrosion resistance, oil resistance, solvent resistance, etc., and has a high space factor. Is required.
一般に、電磁鋼板に絶縁被膜を形成する方法としては、
クロム酸塩やリン酸塩等の無機物を主成分とする処理液
を塗布した後、焼付けて、無機質皮膜を形成する方法
と、クロム酸塩を主成分とする無機物とアクリル樹脂、
酢酸ビニル樹脂等の合成樹脂のエマルジヨンとの混合物
からなる処理液を塗布した後、焼付けて、有機無期混合
系皮膜を形成する二つの方法に大別される。Generally, as a method of forming an insulating coating on a magnetic steel sheet,
After applying a treatment liquid containing an inorganic substance such as a chromate or a phosphate as a main component, baking it to form an inorganic film, an inorganic substance containing a chromate as a main component and an acrylic resin,
The method is roughly divided into two methods of applying a treatment liquid consisting of a mixture of synthetic resin such as vinyl acetate resin and emulsion, and then baking it to form an organic permanent mixed coating film.
上記無機系皮膜を施した電磁鋼板は、打抜き性や耐食性
に劣るほか、皮膜が曲げ密着性にも劣る。これに対し
て、有機無機混合系絶縁被膜を被覆した電磁鋼板は、前
記無機系皮膜を被覆したものに比べて、打抜性や耐食性
にもすぐれ、更に、皮膜の密着性にもすぐれるので、現
在、有機無機混合系絶縁被膜を被覆した電磁鋼板が家庭
電気機器等におけるモーターやトランスの心材として広
く用いられている。The electromagnetic steel sheet coated with the above-mentioned inorganic coating is inferior in punching property and corrosion resistance, and the coating is also inferior in bending adhesion. On the other hand, the electromagnetic steel sheet coated with the organic-inorganic mixed insulating coating is superior in punching property and corrosion resistance to the one coated with the inorganic coating, and further has excellent coating adhesion. At present, magnetic steel sheets coated with an organic-inorganic mixed insulating coating are widely used as core materials for motors and transformers in home electric appliances and the like.
しかし、有機無機混合系絶縁被膜を有する電磁鋼板の製
造においては、絶縁被膜を形成する作業途中でロールコ
ーターの液溜め容器、所謂コーターパン中で処理液の表
面の樹脂が固化し、この固化物がコーターロールを介し
て鋼板表面に付着して、不均一な被膜を形成するのを防
止するために、処理液の交換やロールの清掃とを再々要
し、かくして、生産性が損なわれる問題がある。However, in the production of a magnetic steel sheet having an organic-inorganic mixed insulating coating, the resin on the surface of the treatment liquid is solidified in a liquid container of a roll coater, a so-called coater pan, during the process of forming the insulating coating, and the solidified product is formed. Adheres to the surface of the steel sheet through the coater roll, and in order to prevent the formation of a non-uniform coating, replacement of the treatment liquid and cleaning of the roll are required again, thus reducing the productivity. is there.
更に、モーター、トランス等の積層コアーの溶接時に悪
臭を生じ、作業環境を悪化させる問題もある。Further, there is a problem that a bad odor is generated when welding laminated cores such as motors and transformers, and the working environment is deteriorated.
発明が解決しようとする課題 本発明は、従来の有機無機混合系絶縁被膜を有する電磁
鋼板の製造における上記したような問題を解決するため
になされたものであつて、電磁鋼板の表面に絶縁被膜を
施す際の作業性及び得られた電磁鋼板のスリツト加工時
の被膜密着性にすぐれると共に、積層コアーの溶接時に
臭気の少ない有機無機混合系絶縁被膜を形成し得る電磁
鋼板の製造のための処理液組成物を提供することを目的
とする。DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention The present invention has been made to solve the above problems in the production of a magnetic steel sheet having a conventional organic-inorganic mixed insulating coating, and an insulating coating on the surface of the magnetic steel sheet. For the production of magnetic steel sheet which is excellent in workability at the time of applying and the coating adhesion at the time of slitting of the obtained electromagnetic steel sheet, and which can form an organic-inorganic mixed insulating coating with less odor during welding of laminated core An object is to provide a treatment liquid composition.
課題を解決するための手段 本発明による絶縁被膜を有する電磁鋼板の製造のための
処理液組成物は、クロム酸塩及び重クロム酸塩の少なく
とも１種と合成樹脂のエマルジヨンとを含む絶縁被膜を
有する電磁鋼板の製造のための処理液組成物において、
上記合成樹脂がテレフタル酸系ポリエステル樹脂20〜50
重量％とアクリル系樹脂又はアクリル−スチレン系共重
合樹脂80〜50重量％とからなり、且つ、ガラス転移点が
20〜50℃であることを特徴とする。Means for Solving the Problems A treatment liquid composition for producing an electromagnetic steel sheet having an insulating coating according to the present invention comprises an insulating coating containing at least one of chromate and dichromate and synthetic resin emulsion. In a treatment liquid composition for producing an electromagnetic steel sheet having,
The above synthetic resin is terephthalic acid type polyester resin 20 to 50
% By weight and 80% to 50% by weight of acrylic resin or acrylic-styrene copolymer resin, and has a glass transition point.
It is characterized in that the temperature is 20 to 50 ° C.
本発明による絶縁被膜を有する電磁鋼板の製造のための
処理液組成物は、主成分として、クロム酸塩及び重クロ
ム酸塩の少なくとも１種を無機成分として含有し、マグ
ネシウム塩、カルシウム塩、亜鉛塩等が好適に用いられ
る。しかし、無水クロム酸と、マグネシウム、カルシウ
ム、亜鉛等の酸化物又は水酸化物の混合物を用いること
もできる。The treatment liquid composition for producing an electromagnetic steel sheet having an insulating coating according to the present invention contains, as a main component, at least one of chromate and dichromate as an inorganic component, and contains magnesium salt, calcium salt, zinc. Salt or the like is preferably used. However, it is also possible to use a mixture of chromic anhydride and an oxide or hydroxide of magnesium, calcium, zinc or the like.
更に、本発明による処理液組成物は、有機成分として、
テレフタル酸系ポリエステル樹脂20〜50重量％とアクリ
ル系樹脂又はアクリル−スチレン系共重合樹脂80〜50重
量％からなり、且つ、ガラス移転点が20〜55℃である樹
脂の混合物のエマルジヨンを含有する。Furthermore, the treatment liquid composition according to the present invention, as an organic component,
20% to 50% by weight of a terephthalic acid type polyester resin and 80% to 50% by weight of an acrylic resin or an acrylic-styrene type copolymer resin, and containing an emulsion of a mixture of resins having a glass transition point of 20 to 55 ° C. .
樹脂混合物のガラス転移点が20℃よりも低いときは、例
えば、夏期等において、作業雰囲気温度が25℃を越える
ような場合に、コーターパン中の液表面及び泡部分で水
分が蒸発したときに、樹脂が濃化されて、被膜状物又は
塊状物を形成する。このような被膜状物又は塊状物は、
処理液を攪拌しても、容易には再溶解しなてために、前
述したように、ロールコーターのロールに付着堆積した
り、或いはロールを介して電磁鋼板の付着したりして、
絶縁被膜を不均一にし、皮膜の絶縁性能を著しく損な
う。When the glass transition point of the resin mixture is lower than 20 ° C., for example, when the working atmosphere temperature exceeds 25 ° C. in the summer, etc., when the water is evaporated on the liquid surface and the foam portion in the coater pan. , The resin is thickened to form a film or lump. Such a coating or lump,
Even if the treatment liquid is agitated, it is not easily redissolved, and as described above, it is deposited and deposited on the roll of the roll coater, or is attached to the electromagnetic steel sheet through the roll,
Makes the insulation coating non-uniform and significantly impairs the insulation performance of the coating.
しかし、樹脂混合物のガラス転移点が55℃を越えるとき
は、得られる絶縁被膜が硬質となつて、電磁鋼板のその
後のスリツト加工やコアーへの打抜き加工において、被
膜の一部が剥離しやすく作業効率を阻害する。However, when the glass transition temperature of the resin mixture exceeds 55 ° C, the resulting insulating coating becomes hard and part of the coating easily peels off during subsequent slitting of the electrical steel sheet and punching into the core. Hinders efficiency.
また、本発明による処理液組成物において、上記樹脂混
合物中、テレフタル酸系ポリエステル樹脂が20重量％よ
りも少ないときは、溶接時の悪臭の発生を十分に低減さ
せることができず、他方、50重量％を越えるときは、処
理液組成物の経時安定性が劣化する。Further, in the treatment liquid composition according to the present invention, when the terephthalic acid-based polyester resin is less than 20% by weight in the resin mixture, it is not possible to sufficiently reduce the generation of malodor during welding. When it exceeds the weight percentage, the temporal stability of the treatment liquid composition deteriorates.
かかる合成樹脂エマルジヨンを含む処理液組成物によれ
ば、上記したように、溶接時、悪臭が有効に低減され、
また、経時安定性がすぐれるのみならず、絶縁被膜にす
ぐれた打抜き性と耐食性を与える。この後者の観点から
は、エマルジヨン中の樹脂含有量は10〜50重量％の範囲
が好適である。10重量％よりも少ないときは、絶縁被膜
の打抜き性及び耐食性の改善の効果に乏しく、他方、処
理液に50重量％を越えて過多に配合しても、上記改善の
効果が飽和するのみならず、コアーに打抜き、歪取り焼
鈍した後の被膜密着性を損なうので好ましくない。According to the treatment liquid composition containing the synthetic resin emulsion, as described above, the malodor is effectively reduced during welding,
Further, not only the stability over time is excellent, but also the insulating coating is provided with excellent punchability and corrosion resistance. From this latter viewpoint, the resin content in the emulsion is preferably in the range of 10 to 50% by weight. When the amount is less than 10% by weight, the effect of improving the punching property and corrosion resistance of the insulating coating is poor, and on the other hand, even if the amount of the processing solution exceeds 50% by weight, the above-mentioned improving effect is saturated. However, the coating adhesion after punching into the core and strain relief annealing is impaired, which is not preferable.
更に、本発明においては、処理液組成物は、その塗布及
び焼付け時の焼付け時間を短縮するために、グレセリン
やポリエチレングリコール等の多価アルコール等の有機
還元剤を含有し、或いは得られる絶縁被膜の耐熱性を一
層向上させるために、ホウ酸、ホウ酸塩、ケイ酸ゾル、
アルミナゾル等を含有していてもよい。Further, in the present invention, the treatment liquid composition contains an organic reducing agent such as polyhydric alcohol such as glycerin or polyethylene glycol in order to shorten the baking time during coating and baking, or an insulating coating obtained. In order to further improve the heat resistance of boric acid, boric acid salt, silicic acid sol,
It may contain alumina sol or the like.
上記した処理液差生物をロールコーターや溝付きロール
等の適宜手段によつて、電磁鋼板に塗布した後、例え
ば、250〜500℃の温度で10〜180秒程度焼付け、乾燥被
膜量を0.8〜5.0g/m2程度とすることによつて、高性能の
絶縁被膜を有する電磁鋼板を得ることができる。By means of a suitable means such as a roll coater or a grooved roll, the treatment liquid difference organisms described above are applied to magnetic steel sheets, and then baked, for example, at a temperature of 250 to 500 ° C. for about 10 to 180 seconds, and a dry coating amount of 0.8 to By setting it to about 5.0 g / m 2, it is possible to obtain a magnetic steel sheet having a high-performance insulating coating.
発明の効果 以上のように、本発明の処理液組成物によれば、コータ
ーパンでの樹脂の被膜張りや塊状物の生成がなく、絶縁
被膜処理の効率を向上させることができる。また、得ら
れる絶縁被膜は、均一であり、且つ、スリツト加工及び
打抜き加工において、被膜の剥離がなく、以後の作業効
率の向上にも寄与する。EFFECTS OF THE INVENTION As described above, according to the treatment liquid composition of the present invention, there is no resin coating on the coater pan or formation of lumps, and the efficiency of the insulation coating treatment can be improved. Further, the obtained insulating coating is uniform, and there is no peeling of the coating during slitting and punching, which contributes to the improvement of work efficiency thereafter.
更に、溶接時の悪臭の発生が著しく低減されるので、作
業環境を改善する。Further, the generation of malodor during welding is significantly reduced, which improves the working environment.
実施例 以下に実施例を挙げて本発明を説明するが、本発明はこ
れら実施例により何ら限定されるものではない。EXAMPLES The present invention will be described below with reference to examples, but the present invention is not limited to these examples.
尚、以下の実施例において、処理液組成物の性状の観察
は、次のようにして行なつた。In the following examples, the properties of the treatment liquid composition were observed as follows.
処理液の樹脂膜張り 実験用ロールコーター（ロール径220mm、ロール長さ600
mm、３ロール型）を用い、板を通さずに連続運転を行な
つて、液面の被膜発生を目視にて観察し、被膜発生に至
る時間でもつて評価した。○は30時間以上、被膜発生な
し、△は３〜30時間で被膜発生、×は３時間以内に被膜
発生を示す。Resin coating of processing liquid Roll coater for experiment (roll diameter 220mm, roll length 600
mm, 3 roll type), continuous operation was performed without passing through the plate, and the film formation on the liquid surface was visually observed, and the time until the film formation was evaluated. ◯ indicates no film formation for 30 hours or more, Δ indicates film formation in 3 to 30 hours, and x indicates film formation within 3 hours.
処理液の経時変化 処理液を試験管中で放置し、ゲル化及び分離状況を目視
にて観察し、上記変化が生じるに至つた時間で評価し
た。○は48時間以上、変化なし、△は７〜48時間で変化
あり、×は７時間以内に変化ありを示す。Time-dependent change of treatment liquid The treatment liquid was left in a test tube, and the gelation and separation conditions were visually observed, and the time at which the above change occurred was evaluated. ◯ indicates that there was no change for 48 hours or more, Δ indicates that there was a change within 7 to 48 hours, and x indicates that there was a change within 7 hours.
溶接時の臭気 TIG溶剤時に発生する臭気によつた。○は臭気なし、△
は僅かに臭気あり、×は強い臭気ありを示す。Odor during welding This was due to the odor generated during TIG solvent. ○ has no odor, △
Indicates a slight odor, and x indicates a strong odor.
また、ロールコーターによる処理液の電磁鋼板への塗布
を連続して行なつて、コーターパンでの樹脂被膜張りの
有無を観察すると共に、得られた有機無機混合系絶縁被
膜を有する電磁鋼板について、スリツト加工性、打抜き
性及び溶剤時の臭気発生の有無を次のようにして調べ
た。Further, by continuously performing the application of the treatment liquid to the electromagnetic steel sheet by the roll coater, and observing the presence or absence of resin coating in the coater pan, for the electromagnetic steel sheet having the obtained organic-inorganic mixed insulating coating, The slit workability, the punchability, and the presence or absence of odor generation in the solvent were examined as follows.
スリツト加工性 約14トンのコイルを幅56mmにスリツトしたときに用いた
フエルトへの被膜の付着量で判定した。○は殆ど付着な
し、△は少量の付着が認められる、×は多量の付着が認
められる、を示す。Slit workability It was judged by the amount of coating adhered to the felt used when a coil of about 14 tons was slit to a width of 56 mm. ◯ indicates almost no adhesion, Δ indicates a small amount of adhesion is observed, and x indicates a large amount of adhesion is observed.
打抜性 10mm径スチールダイス（金型SKD−11）にて、打抜き油
を用いて、電磁鋼板を打抜き速度300枚／分で連続打抜
きし、かえり高さ50μｍに達するまでの打抜き枚数で示
す。Punchability 10 mm diameter steel dies (die SKD-11) are used to punch electromagnetic oil steel sheets continuously at a punching speed of 300 sheets / min. The burr height is 50 μm.
実施例１〜４及び比較例１〜４ 重クロム酸マグネシウム120g/l、ホウ酸30g/l、グリセ
リン20g/l及び第１表に示す合成樹脂エマルジヨンを固
形分として30重量％含むように加えて、処理液を調製し
た。Examples 1 to 4 and Comparative Examples 1 to 4 Magnesium dichromate 120 g / l, boric acid 30 g / l, glycerin 20 g / l and synthetic resin emulsion shown in Table 1 were added so as to contain 30% by weight as a solid content. , A treatment solution was prepared.
この処理液を電磁鋼板（板厚0.5mm、50A1000相当）の表
面に溝付きロールを用いて乾燥被膜量1.3〜1.5g/m2とな
るように塗布し、350℃で60秒間焼付けて、絶縁被膜電
磁鋼板を製造し、溶接試験に供した。This treatment liquid is applied to the surface of an electromagnetic steel plate (0.5 mm thickness, 50A1000 equivalent) using a grooved roll so that the dry coating amount is 1.3 to 1.5 g / m 2, and baked at 350 ° C for 60 seconds to insulate. A coated magnetic steel sheet was manufactured and subjected to a welding test.
上記処理液の性状及び溶接試験結果を第１表に示す。Table 1 shows the properties of the treatment liquid and the results of the welding test.
次に、第２表に示す組成を有する処理液を電磁鋼板（板
厚0.5mm、板幅914mm、50A1000相当）の表面にロールコ
ーターを用いて乾燥被膜量1.3〜1.5g/m2となるように塗
布し、330℃で60秒間焼付けて、絶縁被膜電磁鋼板を製
造した。ロールコーター周辺の雰囲気温度は26〜32℃で
あつた。Next, a treatment liquid having the composition shown in Table 2 was applied to the surface of the electromagnetic steel plate (plate thickness 0.5 mm, plate width 914 mm, 50A1000 equivalent) using a roll coater so that the dry coating amount was 1.3 to 1.5 g / m 2. And baked at 330 ° C. for 60 seconds to produce an insulating coated electromagnetic steel sheet. The ambient temperature around the roll coater was 26 to 32 ° C.
上記において、処理液の性状、得られた絶縁被膜電磁鋼
板のスリツト加工性、打抜き加工性及び溶接時の臭気の
発生の有無を調べた。結果を第２表に示す。 In the above, the properties of the treatment liquid, the slit workability of the obtained insulating coated electromagnetic steel sheet, the punching workability, and the presence or absence of odor during welding were examined. The results are shown in Table 2.
Claims (2)
１種と合成樹脂のエマルジヨンとを含む絶縁被膜を有す
る電磁鋼板の製造のための処理液組成物において、上記
合成樹脂がテレフタル酸系ポリエステル樹脂20〜50重量
％とアクリル系樹脂又はアクリル−スチレン系共重合樹
脂80〜50重量％とからなり、且つ、ガラス転移点が20〜
55℃であることを特徴とする処理液組成物。1. A treatment liquid composition for producing an electromagnetic steel sheet having an insulating coating containing at least one of chromate and dichromate and an emulsion of synthetic resin, wherein the synthetic resin is terephthalic acid type polyester. Resin 20 to 50% by weight and acrylic resin or acrylic-styrene copolymer resin 80 to 50% by weight, and having a glass transition point of 20 to
A treatment liquid composition, which is at 55 ° C.
が10〜50重量％であることを特徴とする請求項第１項記
載の絶縁被膜を有する処理液組成物。2. The treatment liquid composition having an insulating coating according to claim 1, wherein the synthetic resin emulsion has a synthetic resin content of 10 to 50% by weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2266041A JPH06102834B2 (en) | 1990-10-02 | 1990-10-02 | Treatment liquid composition for production of electrical steel sheet having insulating coating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2266041A JPH06102834B2 (en) | 1990-10-02 | 1990-10-02 | Treatment liquid composition for production of electrical steel sheet having insulating coating |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04141590A JPH04141590A (en) | 1992-05-15 |
| JPH06102834B2 true JPH06102834B2 (en) | 1994-12-14 |
Family
ID=17425574
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2266041A Expired - Lifetime JPH06102834B2 (en) | 1990-10-02 | 1990-10-02 | Treatment liquid composition for production of electrical steel sheet having insulating coating |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06102834B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6222363B2 (en) * | 2015-04-07 | 2017-11-01 | Ｊｆｅスチール株式会社 | Electrical steel sheet with insulation coating |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50122530A (en) * | 1974-03-14 | 1975-09-26 | ||
| JPS5379296A (en) * | 1976-12-23 | 1978-07-13 | Kawasaki Steel Co | Method of forming insulating film on electrical sheet * wherein nasty smell occurs little upon welding and workability for punching is excellent |
| JPH01100280A (en) * | 1987-10-12 | 1989-04-18 | Kawasaki Steel Corp | Electric iron plate having electrical insulating film excellent in various characteristics |
-
1990
- 1990-10-02 JP JP2266041A patent/JPH06102834B2/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50122530A (en) * | 1974-03-14 | 1975-09-26 | ||
| JPS5379296A (en) * | 1976-12-23 | 1978-07-13 | Kawasaki Steel Co | Method of forming insulating film on electrical sheet * wherein nasty smell occurs little upon welding and workability for punching is excellent |
| JPH01100280A (en) * | 1987-10-12 | 1989-04-18 | Kawasaki Steel Corp | Electric iron plate having electrical insulating film excellent in various characteristics |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04141590A (en) | 1992-05-15 |
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