JP3386318B2 - Electromagnetic steel sheet with insulating coating that can be manufactured by low-temperature baking, can perform strain relief annealing, and has good solvent resistance - Google Patents
Electromagnetic steel sheet with insulating coating that can be manufactured by low-temperature baking, can perform strain relief annealing, and has good solvent resistanceInfo
- Publication number
- JP3386318B2 JP3386318B2 JP19456396A JP19456396A JP3386318B2 JP 3386318 B2 JP3386318 B2 JP 3386318B2 JP 19456396 A JP19456396 A JP 19456396A JP 19456396 A JP19456396 A JP 19456396A JP 3386318 B2 JP3386318 B2 JP 3386318B2
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Description
【０００１】[0001]
【発明の属する技術分野】本発明は六価クロムのように
有害な化合物を含まず、また、低温焼き付けで製造で
き、歪取り焼鈍が可能で耐溶剤性が良好な絶縁被膜付き
電磁鋼板に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic steel sheet with an insulating coating, which does not contain harmful compounds such as hexavalent chromium, can be manufactured by low temperature baking, can be strain-relieved and has excellent solvent resistance.
【０００２】[0002]
【従来の技術】モータや変圧器等に使用される電磁鋼板
の絶縁被膜は層間抵抗だけでなく、加工成形時及び保管
時の利便さの観点から種々の特性が要求される。また、
打抜加工後に磁気特性を向上させるため７５０〜８５０
℃程度で歪取り焼鈍を行う場合が多く、歪取り焼鈍に耐
える必要がある場合がある。このように、電磁鋼板は多
様に使用されるため、用途に応じて種々の絶縁被膜の開
発が行われている。2. Description of the Related Art Insulating coatings of electromagnetic steel sheets used for motors, transformers and the like are required to have various characteristics in view of not only interlayer resistance but also convenience during processing and storage. Also,
750 to 850 to improve magnetic properties after punching
In many cases, strain relief annealing is performed at about C, and it may be necessary to withstand the strain relief annealing. As described above, since electromagnetic steel sheets are used in various ways, various insulating coatings have been developed depending on the application.
【０００３】絶縁被膜は、溶接性、耐熱性を重視し、
歪取り焼鈍に耐える無機質皮膜、打抜性、溶接性の両
立を目指し歪取り焼鈍に耐える、樹脂含有の半有機質被
膜、特殊用途で歪取り焼鈍不可の有機質被膜の３種に
大別されるが、汎用品として歪取り焼鈍に耐えるのは
、の無機質を含む被膜であり、特に、有機樹脂を含
有したクロム酸塩系絶縁被膜は、１コート１ベークの製
造で無機系絶縁被膜に比較して打抜性を格段に向上させ
ることができるので広く利用されている。例えば、特公
昭６０−３６４７６号公報には、少なくとも１種の２価
金属を含む重クロム酸塩系水溶液に、該水溶液中のＣｒ
Ｏ3 ：１００重量部に対し有機樹脂として酢酸ビニル／
ベオバ比が９０／１０〜４０／６０の比率になる樹脂エ
マルジョンを樹脂固形分で５〜１２０重量部及び有機還
元剤を１０〜６０重量部の割合で配合した処理液を生地
鉄板の表面に塗布し、常法による焼き付け工程を経て得
たものであることを特徴とする電磁鋼板の絶縁被膜形成
法が開示されている。しかしながら、少なくとも１種の
２価金属を含むクロム酸塩系被膜は六価クロムを三価に
還元して不溶化するために比較的高温で焼き付けること
が必要である。また、六価クロムは毒性が高いため、環
境汚染の問題が懸念され、また、廃液処理にコストがか
かる問題がある。The insulation coating places importance on weldability and heat resistance,
It is roughly classified into three types: an inorganic film that resists stress relief annealing, a resin-containing semi-organic film that resists stress relief annealing with the aim of achieving both punchability and weldability, and an organic film that cannot be stress relief annealed for special purposes. As a general-purpose product, it is a film containing an inorganic material that withstands strain relief annealing, and in particular, a chromate-based insulating film containing an organic resin is compared with an inorganic insulating film in the production of one coat and one bake. It is widely used because it can significantly improve punchability. For example, Japanese Patent Publication No. 60-36476 discloses that a dichromate-based aqueous solution containing at least one divalent metal is used, and Cr in the aqueous solution is added.
O 3 : Vinyl acetate / as an organic resin with respect to 100 parts by weight
Applying a treatment liquid in which resin emulsion having a Baoba ratio of 90/10 to 40/60 in a resin solid content of 5 to 120 parts by weight and an organic reducing agent in a ratio of 10 to 60 parts by weight is applied to the surface of the base iron plate. However, there is disclosed a method for forming an insulating coating on an electromagnetic steel sheet, which is obtained through a baking process according to a conventional method. However, a chromate-based coating containing at least one divalent metal needs to be baked at a relatively high temperature in order to reduce hexavalent chromium to trivalent and insolubilize it. Further, since hexavalent chromium is highly toxic, there is a concern that it may cause environmental pollution, and that waste liquid treatment may be costly.
【０００４】クロム酸以外を主剤とする技術として、リ
ン酸塩を主剤とする半有機質絶縁被膜も検討されてい
る。しかしながら、リン酸塩は脱水反応を進行させて不
溶化するために塗装後に高温で焼き付けることが必要で
ある。比較的低温で焼き付け可能な絶縁被膜として、連
続焼鈍時の熱を利用して調質圧延前に被膜を形成して歪
取り焼鈍時の焼き付き防止被膜を施す方法が知られてい
る。例えば、特公昭５９−２１９２７号では無機コロイ
ド状物質を主成分とし、水溶性またはエマルジョンタイ
プの樹脂を加えた水溶液を塗布しそのまま調質圧延する
方法が開示されている。A semi-organic insulating coating containing a phosphate as a main component has also been studied as a technique containing a main component other than chromic acid. However, the phosphate salt needs to be baked at a high temperature after coating in order to accelerate the dehydration reaction and make it insoluble. As an insulating coating that can be baked at a relatively low temperature, a method is known in which heat is applied during continuous annealing to form a coating before temper rolling to provide an anti-seizure coating during strain relief annealing. For example, Japanese Examined Patent Publication No. 59-21927 discloses a method in which an aqueous solution containing an inorganic colloidal substance as a main component and a water-soluble or emulsion type resin is applied and then temper rolling is performed as it is.
【０００５】[0005]
【発明が解決しようとする課題】特公昭５９−２１９２
７号公報に記載の方法によれば、無機コロイド状物質は
確かにクロム酸塩系、リン酸塩系皮膜と比較して低温で
焼き付けることが可能である。すなわち、クロム酸塩
系、リン酸塩系はベトツキを防止するため、水溶性物質
を水不溶性にするための造膜反応を進行させる必要があ
るが、無機コロイド状物質はその必要がなく、中でもシ
リカは最も低温で脱水反応が終了するため、低温焼き付
け時には有利である。しかしながら、樹脂／シリカの混
合物を塗布しても調質圧延及び歪取り焼鈍時の焼き付き
防止には効果があるものの、耐溶剤性が劣るという問題
があった。電磁鋼板の加工工程では溶剤洗浄、各種油
（打抜油、絶縁油等）との接触等、有機溶剤に触れる場
合が多く、絶縁被膜には耐溶剤性は必要な性能である。
本発明は上述した問題点を解決すべくなされたもので、
低温焼き付けで製造でき、歪取り焼鈍が可能で、耐溶剤
性にも優れる汎用コートを提供するものである。[Problems to be Solved by the Invention] Japanese Patent Publication No. Sho 59-2192
According to the method described in Japanese Patent Publication No. 7, the inorganic colloidal substance can be baked at a lower temperature than the chromate-based and phosphate-based coatings. That is, since chromate-based and phosphate-based prevent stickiness, it is necessary to proceed with the film-forming reaction for making the water-soluble substance water-insoluble, but the inorganic colloidal substance does not need to do so. Silica is advantageous in low temperature baking because the dehydration reaction is completed at the lowest temperature. However, although application of the resin / silica mixture is effective in preventing seizure during temper rolling and strain relief annealing, it has a problem of poor solvent resistance. In the process of processing electromagnetic steel sheets, it is often exposed to organic solvents such as solvent cleaning and contact with various oils (punching oil, insulating oil, etc.), and the insulating coating requires solvent resistance.
The present invention has been made to solve the above problems,
It is intended to provide a general-purpose coat which can be manufactured by low temperature baking, can be subjected to strain relief annealing, and has excellent solvent resistance.
【０００６】[0006]
【課題を解決するための手段】発明者らは、上記問題点
を解決するべく、まず、樹脂／シリカ系の各種被膜性能
に及ぼす影響因子を詳細に検討した。その結果、耐溶剤
性は樹脂種及びシリカ種両方の影響が強いことをつきと
め、耐溶剤性向上のために樹脂のガラス転移点を規制
し、被膜中のアルカリ金属量を規制することで本発明の
目的を達成しうることを知見した。In order to solve the above problems, the inventors first examined in detail the influencing factors affecting the performance of various resin / silica coating films. As a result, it was found that the solvent resistance is strongly influenced by both the resin species and the silica species, the glass transition point of the resin is regulated to improve the solvent resistance, and the amount of alkali metal in the coating is regulated. It was found that the purpose of can be achieved.
【０００７】すなわち、本発明は、電磁鋼板用絶縁被膜
に関し、樹脂とシリカを含み、樹脂のガラス転移点が３
０〜１５０℃であり、Ｌｉ，Ｎａ，Ｋの中より選ばれる
１種以上のアルカリ金属をＳｉＯ2 １００重量部に対し
てＭ2 Ｏ換算で０．１〜５重量部含むことを特徴とする
低温焼き付けで製造でき、歪取り焼鈍が可能で耐溶剤性
が良好な絶縁被膜付き電磁鋼板を提供する。また、前記
樹脂（固型分）１００重量部に対するシリカがＳｉＯ2
換算で３〜３００重量部であり、前記絶縁被膜の付着量
が乾燥量で０．０５〜４ｇ／ｍ2 であるのが好ましい。That is, the present invention relates to an insulating coating for an electromagnetic steel sheet, which contains a resin and silica and has a glass transition point of 3 or less.
The temperature is 0 to 150 ° C., and 0.1 to 5 parts by weight in terms of M 2 O is contained in one part or more of an alkali metal selected from Li, Na and K based on 100 parts by weight of SiO 2. (EN) Provided is a magnetic steel sheet with an insulating coating, which can be manufactured by low temperature baking, can be subjected to strain relief annealing and has good solvent resistance. Further, silica is SiO 2 based on 100 parts by weight of the resin (solid content).
It is preferably 3 to 300 parts by weight, and the amount of the insulating coating adhered is preferably 0.05 to 4 g / m 2 on a dry basis.
【０００８】[0008]
【作用】以下に本発明をさらに詳細に説明する。本発明
の出発素材としては、電磁鋼板を用いる。絶縁被膜の形
成に用いる処理液中には歪取り焼鈍後の性能を確保する
ためにシリカを配合するが、シリカ自身の耐溶剤性は優
れるものの樹脂と混合した場合はシリカ種によっても耐
溶剤性に差があることがわかった。シリカ種の差を詳細
に検討したところ、アルカリ金属を含有したシリカを使
用することで耐溶剤性の向上に成功した。Ｌｉ，Ｎａ，
Ｋの中より選ばれる１種以上のアルカリ金属で安定化し
たシリカを用い、被膜中の含有量はＳｉＯ2 １００重量
部に対してＭ2 Ｏ（Ｌｉ2 Ｏ，Ｎａ2 Ｏ，Ｋ2 Ｏ）換算
で０．１〜５好ましくは０．１〜３重量部とする。０．
１重量部未満であると樹脂ガラス転移点下限近傍での耐
溶剤性が不足し、５重量部以上ではそれ以上の耐溶剤性
向上効果が望めずに添加が無意味である。コロイダルシ
リカはｐＨの安定領域が存在するが、アルカリ金属量が
少なく中性の不安定領域になる場合は、アンモニア等を
添加してｐＨ調整すればよい。The present invention will be described in more detail below. A magnetic steel sheet is used as the starting material of the present invention. Silica is blended in the processing liquid used to form the insulating coating to ensure performance after strain relief annealing, but silica itself has excellent solvent resistance, but when mixed with a resin, it also has solvent resistance depending on the type of silica. It turns out that there is a difference. When the difference in silica species was examined in detail, the solvent resistance was successfully improved by using silica containing an alkali metal. Li, Na,
Silica stabilized with at least one alkali metal selected from K is used, and the content in the film is M 2 O (Li 2 O, Na 2 O, K 2 O) with respect to 100 parts by weight of SiO 2. It is 0.1-5 parts by weight, preferably 0.1-3 parts by weight in terms of conversion. 0.
If it is less than 1 part by weight, the solvent resistance in the vicinity of the lower limit of the resin glass transition point is insufficient, and if it is 5 parts by weight or more, no further improvement in solvent resistance can be expected and addition is meaningless. Colloidal silica has a stable pH range. However, when the amount of alkali metal is small and the neutral unstable range is reached, ammonia or the like may be added to adjust the pH.
【０００９】処理液中に配合する樹脂は、水性樹脂（エ
マルジョン、ディスパーション、水溶性）を用いる。シ
リカ中アルカリ金属量及び被膜中アニオン量が規定範囲
であれば、樹脂種によらず耐溶剤性のレベルは向上する
が、樹脂のガラス転移点が３０℃未満であると耐溶剤性
（特にアセトンのように極性の強い溶剤の場合）が不足
する。また、樹脂のガラス転移点が１５０℃超であると
低温焼き付け時の造膜性、被膜密着性が劣るため、樹脂
ガラス転移点は３０〜１５０好ましくは６０〜１５０℃
とする。樹脂１００重量部に対するシリカがＳｉＯ2 換
算で３〜３００重量部であることが好ましい。シリカが
この範囲外でも耐溶剤性は良好であるが、シリカが３重
量部未満であると樹脂分は歪取り焼鈍時には熱分解して
しまうため、被膜残分が少なく焼鈍後の性能（スティキ
ング性等）が不足する。また、シリカが３００重量部超
であると、打抜性が低下し、密着性も低下するからであ
る。好ましくは、３０〜３００重量部である。絶縁被膜
の付着量が０．０５ｇ／ｍ2 未満であると、均一塗布が
困難になり、スティキング性が不足するし、付着量が４
ｇ／ｍ2 超であると、低温乾燥時にふくれが発生するな
ど塗装性が低下するため、絶縁被膜の付着量は０．０５
〜４ｇ／ｍ2 が好ましい。より好ましくは０．１〜２ｇ
／ｍ2 とする。A water-based resin (emulsion, dispersion, water-soluble) is used as the resin to be added to the treatment liquid. If the amount of alkali metal in silica and the amount of anion in the coating are within the specified ranges, the level of solvent resistance is improved regardless of the resin type, but if the glass transition point of the resin is less than 30 ° C, solvent resistance (particularly acetone) In the case of a solvent with strong polarity such as), it is insufficient. If the glass transition point of the resin is higher than 150 ° C, the film-forming property and film adhesion during low temperature baking are poor, so the resin glass transition point is 30 to 150, preferably 60 to 150 ° C.
And Silica is preferably 3 to 300 parts by weight in terms of SiO 2 with respect to 100 parts by weight of the resin. Even if silica is out of this range, the solvent resistance is good, but if the silica content is less than 3 parts by weight, the resin content will be thermally decomposed during stress relief annealing, so there will be little film residue and the performance after annealing (sticking). Sex) is insufficient. Further, if the amount of silica is more than 300 parts by weight, the punching property is deteriorated and the adhesion is also deteriorated. Preferably, it is 30 to 300 parts by weight. If the adhesion amount of the insulating coating is less than 0.05 g / m 2 , uniform coating becomes difficult, sticking property becomes insufficient, and the adhesion amount becomes 4
If it is more than g / m 2 , the coating property will deteriorate due to swelling during low temperature drying, so the amount of insulation film deposited will be 0.05.
~ 4 g / m 2 is preferred. More preferably 0.1-2 g
/ M 2 .
【００１０】耐溶剤性に関しては、樹脂とシリカ両方の
影響があることがわかったが、シリカ自身の耐溶剤性は
優れていることから、樹脂自身の耐溶剤性をあげること
と樹脂とシリカの架橋を促進することで耐溶剤性を向上
できると考えた。すなわち、樹脂自身の耐溶剤性をあげ
るには、樹脂のガラス転移点をあげることが有効であ
り、ガラス転移点３０℃以上で良好な性能を示すが、３
０℃近傍では溶剤種によっては程度は軽いものの若干侵
される場合があり、この場合、シリカ中にアルカリ金属
を含んでいるものが樹脂単体より優れた耐溶剤性を示
す。このメカニズムについては明らかではないが、アル
カリ金属がシリカと樹脂との架橋を促進する金属架橋剤
として働いているとも考えられる。Regarding the solvent resistance, it has been found that both the resin and silica have an effect, but since the solvent resistance of silica itself is excellent, it is necessary to increase the solvent resistance of the resin itself and that of the resin and silica. It was thought that solvent resistance could be improved by promoting crosslinking. That is, it is effective to raise the glass transition point of the resin in order to increase the solvent resistance of the resin itself, and good performance is exhibited at a glass transition point of 30 ° C. or higher.
In the vicinity of 0 ° C., it may be slightly corroded depending on the type of solvent, but it may be slightly corroded. In this case, silica containing an alkali metal exhibits a higher solvent resistance than the resin alone. Although the mechanism is not clear, it is considered that the alkali metal acts as a metal cross-linking agent that promotes cross-linking between silica and the resin.
【００１１】ここに用いる樹脂組成としては特に規制す
るものではないが、例えば、アクリル樹脂、アルキッド
樹脂、ポリオレフィン樹脂、スチレン樹脂、酢酸ビニル
樹脂、エポキシ樹脂、フェノール樹脂、ウレタン樹脂、
メラミン樹脂等の１種または２種以上の樹脂が好適に適
用できる。樹脂のガラス転移点は３０〜１５０℃になる
ようなモノマー組成をとることが必要である。樹脂ガラ
ス転移点はモノマー組成によって一定で樹脂固有の特性
である。ガラス転移点の測定には種々の方法が利用でき
るが、例えば、ＤＳＣ（示差走査熱量計）、ＴＭＡ（熱
機械分析）、熱膨張等があるが、特に定めるものではな
く、物理的性質が大幅にかわることを利用する方法で確
認可能である。また共重合体のガラス転移点は計算も可
能であるため測定困難な時は組成から計算すればよい。
本特許に適合する樹脂はガラス転移点が３０〜１５０℃
となるならどのような樹脂組成でも適用可能である。樹
脂はガラス転移点を境に性質が大きく変化するため、耐
溶剤性試験を行う環境温度よりガラス転移点が高いこと
が好ましいと考えられる。The resin composition used here is not particularly limited, but for example, acrylic resin, alkyd resin, polyolefin resin, styrene resin, vinyl acetate resin, epoxy resin, phenol resin, urethane resin,
One kind or two or more kinds of resins such as melamine resin can be suitably applied. It is necessary to take a monomer composition such that the glass transition point of the resin is 30 to 150 ° C. The resin glass transition point is constant depending on the monomer composition and is a characteristic peculiar to the resin. Although various methods can be used to measure the glass transition point, for example, there are DSC (differential scanning calorimeter), TMA (thermomechanical analysis), thermal expansion, etc. It can be confirmed by the method of using the change. Further, since the glass transition point of the copolymer can be calculated, it can be calculated from the composition when it is difficult to measure.
Resins compatible with this patent have a glass transition point of 30 to 150 ° C.
If so, any resin composition can be applied. Since the properties of the resin change greatly at the glass transition point, it is considered preferable that the glass transition point is higher than the environmental temperature at which the solvent resistance test is conducted.
【００１２】処理液中に配合するシリカの形状は水に分
散するものならどのような製法のものでもよく、コロイ
ダルシリカ、気相シリカ、凝集タイプシリカ等形状は種
々のものが適用可能である。ただし、シリカ中には耐溶
剤性を一層向上させるために、Ｌｉ，Ｎａ，Ｋの中より
選ばれる１種以上のアルカリ金属を含有させる。コロイ
ダルシリカ表面はアニオンに帯電しているため、アルカ
リ金属で安定化することでアルカリ金属の導入が可能で
あるが、樹脂／シリカブレンド液にアルカリ金属を後添
加してもよい。被膜中の含有量はＳｉＯ2 １００重量部
に対してＬｉ2Ｏ，Ｎａ2 Ｏ，Ｋ2 Ｏ換算で０．１〜５
重量部とする。０．１重量部未満であると樹脂ガラス転
移点下限近傍での耐溶剤性が不足し、５重量部以上では
それ以上の耐溶剤性向上効果が望めずに添加が無意味で
ある。また、特にＮａ，Ｋでは過剰に添加するとシリカ
表面でナトリウムシリケート、カリウムシリケート等の
耐水性が劣る組成が発生しやすく、耐水性に問題が出る
場合がある。従って、被膜中のアルカリ金属含有量はＳ
ｉＯ2 １００重量部に対してＬｉ2 Ｏ，Ｎａ2 Ｏ，Ｋ2
Ｏ換算で０．１〜５重量部とする。The silica compounded in the treatment liquid may have any shape as long as it can be dispersed in water, and various shapes such as colloidal silica, vapor phase silica and agglomerated silica can be applied. However, in order to further improve solvent resistance, silica contains at least one alkali metal selected from Li, Na, and K. Since the surface of the colloidal silica is charged with anions, it is possible to introduce an alkali metal by stabilizing it with an alkali metal, but an alkali metal may be added later to the resin / silica blend liquid. The content in the coating is 0.1 to 5 in terms of Li 2 O, Na 2 O and K 2 O based on 100 parts by weight of SiO 2.
Parts by weight. If it is less than 0.1 parts by weight, the solvent resistance near the lower limit of the resin glass transition point is insufficient, and if it is 5 parts by weight or more, no further improvement in solvent resistance can be expected and addition is meaningless. Further, particularly when Na and K are excessively added, a composition having poor water resistance such as sodium silicate and potassium silicate is likely to occur on the surface of silica, which may cause a problem in water resistance. Therefore, the content of alkali metal in the coating is S
iO Li 2 O with respect to 2 100 parts by weight, Na 2 O, K 2
It is 0.1 to 5 parts by weight in terms of O.
【００１３】以上の薬剤を電磁鋼板上に塗布して焼き付
けることにより被膜を形成させる。絶縁被膜形成方法は
工業的に一般に用いられるロールコーター法、フローコ
ーター、スプレー塗装、ナイフコーター等種々の方法が
適用可能である。焼き付け方法についても通常実施され
るような熱風式、赤外式、誘導加熱式等、特に規制する
ものではなく、被膜中の水分が蒸発する程度の低温加熱
で十分であり、例えば、５０〜２５０℃程度の低い到達
板温で１分以内の短時間焼き付けをすることが可能であ
る。なお、被膜の性能を一層向上させるために、防錆剤
等添加剤を配合してもよい。この場合、歪取り焼鈍後の
性能を確保するために有機物質１００重量部に対する無
機物質の合計量は３〜３００重量部の範囲とすることが
好ましい。本発明の絶縁被膜の付着量は０．０５〜４ｇ
／ｍ2 が好ましい。付着量が０．０５ｇ／ｍ2 未満であ
ると均一塗布が困難になり、スティキング性、耐食性が
不足し、付着量が４ｇ／ｍ2 超であると低温乾燥時にふ
くれが発生するなど塗装性が低下する。A coating is formed by applying the above chemicals on an electromagnetic steel sheet and baking it. Various methods such as a roll coater method, a flow coater, spray coating, and a knife coater which are commonly used in industry can be applied to the method for forming the insulating film. The baking method is not particularly limited, such as hot-air method, infrared method, induction heating method, etc., which are usually carried out, and low-temperature heating such that water in the coating film is evaporated is sufficient, for example, 50 to 250. It is possible to perform baking for a short time within 1 minute at a reached plate temperature as low as ℃. In addition, in order to further improve the performance of the film, an additive such as a rust preventive agent may be added. In this case, it is preferable that the total amount of the inorganic substances with respect to 100 parts by weight of the organic substances is in the range of 3 to 300 parts by weight in order to secure the performance after the strain relief annealing. The amount of the insulating coating film of the present invention is 0.05 to 4 g
/ M 2 is preferred. Deposition amount becomes difficult to uniformly coating is less than 0.05 g / m 2, sticking resistance, corrosion resistance is insufficient, such as the amount of adhesion blistering at low temperature drying to be 4g / m 2 than occurs paintability Is reduced.
【００１４】[0014]
【実施例】以下、本発明の効果を実施例に基づいて具体
的に説明する。
（実施例）板厚０．５ｍｍの電磁鋼板の表面に表１に記
載の被膜を形成した。塗布は、ロールコーターで行い、
到達板温１５０℃で焼き付け放冷した後、試験に供し
た。なお、各性能評価法の詳細は以下の通りである。表
１から明らかなように本発明例はいずれも耐溶剤性、打
抜性、歪取り焼鈍前後密着性、スティキング性等に優れ
た絶縁被膜付き電磁鋼板である。なお、表中の実施例は
基本として着眼している性能のみの改善を目指すもので
あるが、その中でもさらに他の各種性能を向上させる例
もあり、他の各種性能について比較例となるものを備考
に示した。EXAMPLES The effects of the present invention will be specifically described below based on examples. (Example) The coating film shown in Table 1 was formed on the surface of an electromagnetic steel plate having a plate thickness of 0.5 mm. Apply with a roll coater,
The plate was baked at an ultimate plate temperature of 150 ° C. and left to cool, and then subjected to the test. The details of each performance evaluation method are as follows. As is clear from Table 1, all the examples of the present invention are magnetic steel sheets with an insulating coating, which are excellent in solvent resistance, punchability, adhesion before and after stress relief annealing, sticking property, and the like. In addition, the examples in the table are intended to improve only the performance that is basically focused on, but there are also examples in which other various performances are further improved, and comparative examples of other various performances are shown. Shown in remarks.
【００１５】耐溶剤性
各種溶剤（ヘキサン、キシレン、メタノール、エタノー
ル、アセトン）を脱脂綿にしみこませ、鋼板を５往復し
た後の外観変化を調査した。
◎：変化なし
○：変化ほとんどなし
△：若干変色
×：変化大Solvent resistance Various solvents (hexane, xylene, methanol, ethanol, acetone) were soaked in absorbent cotton, and the appearance change after the steel plate was reciprocated 5 times was examined. ◎: No change ○: Almost no change △: Slightly discolored ×: Large change
【００１６】打抜性
１５ｍｍφスチールダイスにおいて、かえり高さが５０
μｍに達するまでの打ち抜き数で評価した。
◎：５０万回超
○：３０万〜５０万回
△：１０万〜３０万回未満
×：１０万回未満 With a punchability of 15 mmφ steel die, the burr height is 50
It was evaluated by the number of punches until reaching μm. ◎: Over 500,000 times ○: 300,000-500,000 times △: 100,000-less than 300,000 times ×: Less than 100,000 times
【００１７】密着性
製品板及び歪取り焼鈍板（窒素中７５０℃×２ｈ焼鈍）
で評価した。２０ｍｍφでの１８０°曲げ戻し試験後の
被膜剥離率で評価した。
◎：剥離なし
○：〜剥離２０％未満
△：剥離２０％〜剥離４０％未満
×：剥離４０％〜全面剥離 Adhesion Product plate and strain relief annealed plate (annealed in nitrogen at 750 ° C. for 2 hours)
It was evaluated by. The film peeling rate after the 180 ° bending back test at 20 mmφ was evaluated. ⊚: No peeling ○: Less than 20% peeling Δ: 20% peeling less than 40% peeling ×: 40% peeling-all peeling
【００１８】スティキング性
５０ｍｍ角の鋼板１０枚を重ねて荷重（２００ｇ／ｃｍ
2 ）をかけながら窒素雰囲気下で７５０℃×２時間焼鈍
した後、鋼板上に分銅５００ｇを落下させ、５分割する
ときの落下高さを調査した。
◎：１０ｃｍ未満
○：１０〜１５ｃｍ未満
△：１５〜３０ｃｍ
×：３０ｃｍ超 Sticking property 10 sheets of 50 mm square are stacked and loaded (200 g / cm
After applying 2 ) and annealing in a nitrogen atmosphere at 750 ° C. for 2 hours, 500 g of a weight was dropped on a steel plate and the drop height when dividing into 5 parts was investigated. ◎: Less than 10 cm ○: 10 to less than 15 cm △: 15 to 30 cm ×: more than 30 cm
【００１９】[0019]
【表１】 [Table 1]
【００２０】[0020]
【表２】 [Table 2]
【００２１】[0021]
【発明の効果】本発明は以上説明したように構成されて
いるので、低温焼付で製造でき、歪取り焼鈍が可能で耐
溶剤性も良好であり、その他、電磁鋼板の絶縁被膜とし
て必要な性能を兼ね備えているので、モーター、トラン
ス等の用途をはじめ広く利用することができる。EFFECTS OF THE INVENTION Since the present invention is constructed as described above, it can be manufactured by low-temperature baking, can be strain-relieved and has excellent solvent resistance, and has other performances required as an insulating coating for electromagnetic steel sheets. Since it has both, it can be widely used for applications such as motors and transformers.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭54−31598（ＪＰ，Ａ) 特開 平５−179458（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) C23C 22/00 - 22/86 H01F 1/18 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-54-31598 (JP, A) JP-A-5-179458 (JP, A) (58) Fields investigated (Int.Cl. 7 , DB name) C23C 22/00-22/86 H01F 1/18
Claims (3)
を含み、樹脂のガラス転移点が３０〜１５０℃であり、
Ｌｉ，Ｎａ，Ｋの中より選ばれる１種以上のアルカリ金
属をＳｉＯ2 １００重量部に対してＭ2 Ｏ換算で０．１
〜５重量部含むことを特徴とする低温焼き付けで製造で
き、歪取り焼鈍が可能で耐溶剤性が良好な絶縁被膜付き
電磁鋼板。1. An insulating coating for electromagnetic steel sheet, comprising resin and silica, wherein the resin has a glass transition point of 30 to 150 ° C.
One or more kinds of alkali metals selected from Li, Na and K are added to 0.1 parts by weight of SiO 2 in terms of M 2 O based on 100 parts by weight of SiO 2.
A magnetic steel sheet with an insulating coating, which can be manufactured by low temperature baking, is capable of strain relief annealing, and has good solvent resistance, which is characterized by containing up to 5 parts by weight.
シリカがＳｉＯ2 換算で３〜３００重量部である請求項
１記載の低温焼き付けで製造でき、歪取り焼鈍が可能で
耐溶剤性が良好な絶縁被膜付き電磁鋼板。2. Silica for 100 parts by weight of the resin (solid content) is 3 to 300 parts by weight in terms of SiO 2 , which can be produced by low temperature baking, strain relief annealing is possible, and solvent resistance is high. Magnetic steel sheet with good insulation coating.
〜４ｇ／ｍ2 である請求項１または２に記載の低温焼き
付けで製造でき、歪取り焼鈍が可能で耐溶剤性が良好な
絶縁被膜付き電磁鋼板。3. The amount of the insulating coating adhered is 0.05 on a dry basis.
To 4 g / m 2 and is able to manufacture at a low temperature baking of claim 1 or 2, can be stress relief annealing solvent resistance good insulation coating with electromagnetic steel sheets.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19456396A JP3386318B2 (en) | 1996-07-24 | 1996-07-24 | Electromagnetic steel sheet with insulating coating that can be manufactured by low-temperature baking, can perform strain relief annealing, and has good solvent resistance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19456396A JP3386318B2 (en) | 1996-07-24 | 1996-07-24 | Electromagnetic steel sheet with insulating coating that can be manufactured by low-temperature baking, can perform strain relief annealing, and has good solvent resistance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1036976A JPH1036976A (en) | 1998-02-10 |
| JP3386318B2 true JP3386318B2 (en) | 2003-03-17 |
Family
ID=16326620
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19456396A Expired - Fee Related JP3386318B2 (en) | 1996-07-24 | 1996-07-24 | Electromagnetic steel sheet with insulating coating that can be manufactured by low-temperature baking, can perform strain relief annealing, and has good solvent resistance |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3386318B2 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4660945B2 (en) * | 2001-03-16 | 2011-03-30 | Ｊｆｅスチール株式会社 | Method for producing electrical steel sheet with insulating coating |
| US10526672B2 (en) | 2015-04-07 | 2020-01-07 | Jfe Steel Corporation | Electrical steel sheet with insulating coating |
-
1996
- 1996-07-24 JP JP19456396A patent/JP3386318B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH1036976A (en) | 1998-02-10 |
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