JP2004204335A - Method of baking coating film by high frequency induction heating - Google Patents
Method of baking coating film by high frequency induction heating Download PDFInfo
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- JP2004204335A JP2004204335A JP2002377833A JP2002377833A JP2004204335A JP 2004204335 A JP2004204335 A JP 2004204335A JP 2002377833 A JP2002377833 A JP 2002377833A JP 2002377833 A JP2002377833 A JP 2002377833A JP 2004204335 A JP2004204335 A JP 2004204335A
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Abstract
Description
【０００１】
【発明の属する技術分野】
この発明は、高周波誘導加熱による塗膜の焼付け方法に関し、特に従来、高周波誘導加熱のみでの塗装焼付けの際に懸念された被膜欠陥の有利な改善を図ろうとするものである。
【０００２】
【従来の技術】
電磁鋼板の表面には、絶縁性をはじめとして、打抜性や耐食性、耐熱性などの諸特性を付与するために、絶縁被膜が被覆される。
従来、かような絶縁被膜の被覆に際しては、熱風炉を用いたガス加熱方式が採用されていたが、最近では、生産能率の向上の観点から、高周波誘導加熱方式が用いられるようになってきた。
しかしながら、上記した高周波誘導加熱方式では、加熱に際して塗装面の内部から加熱されることから、塗料表面の硬化が不十分となり、耐傷つき性や耐汚染性などの被膜特性の劣化を余儀なくされた。また、未蒸発の溶剤に起因してワキと呼ばれる、表面に無数の細かい穴が残る状態が発生し、被膜外観の劣化を招く場合もあった。
【０００３】
上記の問題を解決するものとして、高周波誘導加熱方式と熱風吹き付け方式の両者を併用する方法が提案された（例えば特許文献１）。
【０００４】
【特許文献１】
特開平３−284375号公報（特許請求の範囲）
【０００５】
【発明が解決しようとする課題】
しかしながら、上記した高周波誘導加熱と熱風吹き付けの両者を併用する方法では、設備費が嵩むだけでなく、加熱処理が煩雑になり、さらに高周波誘導加熱のみの場合に比べると処理時間が長いという問題があった。
【０００６】
【課題を解決するための手段】
この発明は、上記の問題を有利に解決するもので、高周波誘導加熱方式のみによって、前述したような被膜特性や被膜外観の劣化を招くことなしに、塗膜を短時間で焼き付けることができる高周波誘導加熱による塗膜の焼付け方法を提案することを目的とする。
【０００７】
さて、発明者らは、上記の課題を達成すべく、高周波誘導加熱に際し、その加熱条件を種々に変化させる広範囲な実験を行い、各場合における被膜特性および被膜外観について調査した。
その結果、処理温度（到達板温）を従来よりも低めに設定した上で、適用周波数および昇温速度を的確に制御してやれば、高周波誘導加熱方式のみによっても、被膜特性や被膜外観の劣化を招くことなしに塗膜を効果的に焼付けできることを新たに見出した。
この発明は、上記の知見に立脚するものである。
【０００８】
すなわち、この発明の要旨構成は次のとおりである。
１．金属板の表面に塗料を塗布したのち、高周波誘導加熱により塗膜を焼き付けるに際し、到達板温が 100〜250 ℃の温度域において、誘導加熱周波数：50 kHz以上、昇温速度：50℃/s以上の条件で焼き付けることを特徴とする高周波誘導加熱による塗膜の焼付け方法。
【０００９】
２．前記金属板が電磁鋼板であり、また前記塗膜が半有機系の絶縁被膜であることを特徴とする上記１記載の高周波誘導加熱による塗膜の焼付け方法。
【００１０】
【発明の実施の形態】
以下、この発明を具体的に説明する。
まず、この発明の基礎となった実験結果について説明する。
図１に、高周波誘導加熱を用いた塗膜の焼付けに際し、到達板温、昇温速度および誘導加熱周波数を種々に変化させた場合における被膜外観および被膜特性について調査した結果を示す。なお、被膜外観としてはワキ等の塗装むらの発生の有無を、また被膜特性としては耐傷つき性の良否について調べた。
同図に示したとおり、到達板温を 100〜250 ℃と低めに設定した上で、鋼板の昇温速度：50℃/s以上、誘導加熱周波数：50 kHz以上の条件で塗膜の焼付けを行えば、ワキ等の塗装むらの発生は全くなく、かつ耐傷つき性の劣化もないことが究明されたのである。
【００１１】
なお、この発明において鋼板の昇温速度の上限は特に制限されることはないが、本発明は誘導加熱のみで加熱されるので、鋼板側（塗膜下層）から加熱されることになり、粉末樹脂やエマルジョン樹脂、ディスパージョン樹脂のように完全溶解ではなく、粒子の形態をもっている樹脂が表層近傍に濃縮されるので、最表層樹脂量が多くなって打抜性が向上する。しかしながら、昇温速度があまりに大きいとこの打抜性の向上効果が不十分となるので、昇温速度の上限は200 ℃/s程度とすることが好ましい。
同様に、誘導加熱周波数についてもその上限は特に制限されることはないが、この誘導加熱周波数があまりに大きいと、インバーターの容量が増大し、設備コストが大きくなるので、誘導加熱周波数の上限は 200 kHz程度とすることが好ましい。
【００１２】
また、この発明における好適塗料としては、次のようなものが挙げられる。
(1) 電磁鋼板用のクロム含有半有機系絶縁被膜
・クロム酸塩水溶液：５〜2000重量部（CrO3換算）
・水性樹脂：100 重量部（樹脂固形分）
・還元剤：５〜100 重量部
・アルミニウム化合物：５〜1000重量部（アルミニウム換算）
ここに
クロム酸塩水溶液：無水クロム酸、クロム酸塩、重クロム酸塩のうちから選んだ少なくとも一種を主剤に用いた水溶液。
水性樹脂：内層としては、フェノール樹脂、エポキシ樹脂、ウレタン樹脂、アミノ樹脂、ポリアミド樹脂など。外層としては、アクリル酸、メタクリル酸、クロトン酸、イタコン酸、マレイン酸、フマール酸などのエチレン性不飽和カルボン酸と、これに重合可能な（メタ）アクリル酸メチル、（メタ）アクリル酸エチル等のアクリル酸またはメタクリル酸のアルキルエステルなどのエチレン性不飽和単量体から形成される樹脂。
還元剤：エチレングリコール、ショ糖、グリセリン等の多価有機アルコール類、ぎ酸、酢酸等のカルボン酸など。
アルミニウム化合物：アルミニウムの酸化物、水酸化物、炭酸塩、クロム酸塩など。
【００１３】
(2) 電磁鋼板用のクロムレス半有機系絶縁被膜
無機成分および水性樹脂、その他必要に応じて防錆剤等の添加剤を、水性塗液中の固形分濃度が10〜30質量％の範囲で含有させたもの。
ここに
無機成分：シリカ、アルミナ、酸化チタン、酸化アンチモンなど。
水性樹脂：アクリル樹脂、アルキド樹脂、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、メラミン樹脂など。
【００１４】
次に、この発明の実施に用いて好適な塗料焼付け設備について説明する。
図２に、上記した塗料焼付け設備の好適例を模式で示し、図中番号１は連続焼鈍炉、２は塗液塗装装置、３は塗料焼付け装置、そして４は鋼板冷却装置である。
冷間圧延後の鋼板を、連続焼鈍炉１で所望の焼鈍処理を施したのち、塗液塗装装置２にて鋼板の表面に絶縁塗液を塗布し、ついで塗料焼付け装置３において、この発明に従う焼付け処理を施す。すなわち、鋼板の到達板温を 100〜250 ℃と低めに設定した上で、鋼板の昇温速度：50℃/s以上、誘導加熱周波数：50 kHz以上の条件で塗料の焼付け処理を行う。その後、鋼板冷却装置４を通して鋼板を室温まで冷却する。
【００１５】
【実施例】
常法に従い製造した無方向性電磁鋼板の表面に、焼付け条件を種々に変化させて半有機系の絶縁被膜を被成した。
なお、半有機系絶縁被膜用の塗料は、次のとおりである。
・アクリル樹脂：100 重量部（樹脂固形分）
・重クロム酸マグネシウム： 200 重量部（CrO3換算）
・エチレングリコール：120 重量部
・水酸化アルミニウム：20重量部（アルミニウム換算）
【００１６】
得られた絶縁被膜付き無方向性電磁鋼板におけるワキ発生の有無および耐傷つき性について調べた結果を、表１に示す。
なお、ワキ発生の有無は目視により判断した。
また、耐傷つき性は、フェルトに荷重を付加した状態で被膜表面を往復させ、目視により被膜のキズの程度を判定した。試験条件は、フェルト接触面積：10×10mm、荷重：0.9 kg、20往復とした。評価基準は次のとおりである。
◎：ほとんどキズが認められない
○：擦り跡が判別できる程度
△：地鉄が若干露出
×：剥離し、地鉄が露出
【００１７】
【表１】
以上、主に電磁鋼板の表面に絶縁被膜を被成する場合について説明したが、この発明は、上記の場合だけに限るものではなく、家電製品等に使用される塗装鋼板を製造する場合にも同様に適用できることはいうまでもない。
【００１９】
【発明の効果】
かくして、この発明によれば、鋼板の表面に塗膜を焼き付けるに際し、高周波誘導加熱方式のみによって、被膜特性や被膜外観の劣化を招くことなしに、短時間で焼き付けることができる。
【図面の簡単な説明】
【図１】被膜特性および被膜外観に及ぼす到達板温、昇温速度および誘導加熱周波数の影響を示した図である。
【図２】この発明の実施に用いて好適な塗料焼付け設備の模式図である。
【符号の説明】
１ 連続焼鈍炉
２ 塗液塗装装置
３ 塗料焼付け装置
４ 鋼板冷却装置[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method of baking a coating film by high-frequency induction heating, and more particularly to an advantageous improvement of a coating defect which has been concerned in the past when baking a coating only by high-frequency induction heating.
[0002]
[Prior art]
The surface of the magnetic steel sheet is coated with an insulating film in order to impart various properties such as punching properties, corrosion resistance, and heat resistance, as well as insulating properties.
Conventionally, when applying such an insulating film, a gas heating method using a hot blast stove has been adopted, but recently, from the viewpoint of improving production efficiency, a high-frequency induction heating method has been used. .
However, in the above-described high-frequency induction heating method, since the coating is heated from the inside of the coating surface during the heating, the coating surface hardens insufficiently, and the coating properties such as scratch resistance and stain resistance have to be degraded. In addition, a state called innumerable fine holes left on the surface due to the un-evaporated solvent occurs, and the appearance of the coating film may be deteriorated in some cases.
[0003]
As a solution to the above problem, a method has been proposed in which both a high-frequency induction heating method and a hot air blowing method are used (for example, Patent Document 1).
[0004]
[Patent Document 1]
JP-A-3-284375 (Claims)
[0005]
[Problems to be solved by the invention]
However, the method of using both the high-frequency induction heating and the hot-air blowing described above not only increases the equipment cost, but also complicates the heating process, and further has a problem that the processing time is longer than when only the high-frequency induction heating is performed. there were.
[0006]
[Means for Solving the Problems]
The present invention advantageously solves the above-mentioned problems, and a high-frequency induction heating method alone can bake a coating film in a short time without causing the deterioration of the coating characteristics and coating appearance as described above. An object of the present invention is to propose a method of baking a coating film by induction heating.
[0007]
By the way, in order to achieve the above-mentioned subject, the inventors conducted a wide range of experiments in which the heating conditions were variously changed during high-frequency induction heating, and investigated the film characteristics and the film appearance in each case.
As a result, if the processing temperature (attained plate temperature) is set lower than before and the applied frequency and heating rate are properly controlled, the deterioration of the coating characteristics and coating appearance can be reduced only by the high-frequency induction heating method. It has been newly found that a coating film can be effectively baked without inviting.
The present invention is based on the above findings.
[0008]
That is, the gist configuration of the present invention is as follows.
1. After applying the paint on the surface of the metal plate, when baking the coating film by high frequency induction heating, in the temperature range where the reached plate temperature is 100 to 250 ° C, induction heating frequency: 50 kHz or more, heating rate: 50 ° C / s A method for baking a coating film by high-frequency induction heating, wherein baking is performed under the above conditions.
[0009]
2. 2. The method for baking a coating film by high-frequency induction heating as described in 1 above, wherein the metal plate is an electromagnetic steel plate, and the coating film is a semi-organic insulating coating.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described specifically.
First, the results of an experiment on which the present invention is based will be described.
FIG. 1 shows the results of investigations on the appearance and characteristics of the coating when the ultimate plate temperature, the heating rate, and the induction heating frequency were variously changed during baking of the coating using high-frequency induction heating. The appearance of the coating was examined for the occurrence of uneven coating such as armpits, and the properties of the coating were examined for scratch resistance.
As shown in the figure, after setting the ultimate sheet temperature to a low temperature of 100 to 250 ° C, baking the coating film under the conditions of a temperature increase rate of the steel sheet of 50 ° C / s or more and an induction heating frequency of 50 kHz or more. It has been found that, if carried out, there is no occurrence of uneven coating such as armpits and no deterioration of scratch resistance.
[0011]
In the present invention, the upper limit of the heating rate of the steel sheet is not particularly limited. However, since the present invention is heated only by the induction heating, the steel sheet is heated from the steel sheet side (the lower layer of the coating film). Since the resin in the form of particles is not completely dissolved like the resin, the emulsion resin, and the dispersion resin but concentrated in the vicinity of the surface layer, the amount of the resin in the outermost layer is increased and the punching property is improved. However, if the heating rate is too high, the effect of improving the punching property becomes insufficient, so the upper limit of the heating rate is preferably about 200 ° C./s.
Similarly, the upper limit of the induction heating frequency is not particularly limited, but if the induction heating frequency is too large, the capacity of the inverter increases and the equipment cost increases. It is preferable to set it to about kHz.
[0012]
In addition, the following are examples of suitable paints in the present invention.
(1) Chromium-containing semi-organic insulating coating for magnetic steel sheets / chromate aqueous solution: 5 to 2000 parts by weight (CrO 3 equivalent)
・ Aqueous resin: 100 parts by weight (resin solid content)
・ Reducing agent: 5 to 100 parts by weight ・ Aluminum compound: 5 to 1000 parts by weight (in terms of aluminum)
Here, a chromate aqueous solution: an aqueous solution using at least one selected from chromic anhydride, chromate, and dichromate as a main component.
Aqueous resin: The inner layer is made of phenol resin, epoxy resin, urethane resin, amino resin, polyamide resin, etc. As the outer layer, an ethylenically unsaturated carboxylic acid such as acrylic acid, methacrylic acid, crotonic acid, itaconic acid, maleic acid, fumaric acid, and polymerizable methyl (meth) acrylate, ethyl (meth) acrylate, etc. Resins formed from ethylenically unsaturated monomers such as acrylic acid or alkyl esters of methacrylic acid.
Reducing agents: polyhydric organic alcohols such as ethylene glycol, sucrose and glycerin, and carboxylic acids such as formic acid and acetic acid.
Aluminum compounds: aluminum oxides, hydroxides, carbonates, chromates and the like.
[0013]
(2) Chromium-less semi-organic insulating coating for electrical steel sheet Inorganic component and water-based resin, and other additives such as rust preventive if necessary, when the solid content concentration in the water-based coating solution is in the range of 10 to 30% by mass. What was included.
Here, inorganic components: silica, alumina, titanium oxide, antimony oxide and the like.
Aqueous resin: acrylic resin, alkyd resin, polyolefin resin, styrene resin, vinyl acetate resin, epoxy resin, phenol resin, urethane resin, melamine resin, etc.
[0014]
Next, paint baking equipment suitable for use in carrying out the present invention will be described.
FIG. 2 schematically shows a preferred example of the above-described paint baking equipment. In the drawing, reference numeral 1 denotes a continuous annealing furnace, 2 denotes a coating liquid coating apparatus, 3 denotes a paint baking apparatus, and 4 denotes a steel plate cooling apparatus.
After subjecting the steel sheet after cold rolling to a desired annealing treatment in a continuous annealing furnace 1, an insulating coating liquid is applied to the surface of the steel sheet by a coating liquid coating apparatus 2, and then a
[0015]
【Example】
A semi-organic insulating coating was formed on the surface of a non-oriented electrical steel sheet manufactured according to a conventional method by changing various baking conditions.
The coating materials for the semi-organic insulating coating are as follows.
・ Acrylic resin: 100 parts by weight (resin solid content)
・ Magnesium dichromate: 200 parts by weight (CrO 3 equivalent)
・ Ethylene glycol: 120 parts by weight ・ Aluminum hydroxide: 20 parts by weight (in terms of aluminum)
[0016]
Table 1 shows the results obtained by examining the occurrence of scratches and scratch resistance in the obtained non-oriented electrical steel sheet with an insulating coating.
The occurrence of armpits was visually determined.
The scratch resistance was determined by reciprocating the coating surface while applying a load to the felt, and visually determining the degree of scratches on the coating. The test conditions were a felt contact area: 10 × 10 mm, a load: 0.9 kg, and 20 reciprocations. The evaluation criteria are as follows.
◎: Almost no scratches are observed. ：: Scratches can be discriminated. △: Slightly exposed base iron. X: Peeled off and exposed base iron.
[Table 1]
As described above, mainly the case where the insulating coating is formed on the surface of the magnetic steel sheet has been described.However, the present invention is not limited to the above case, and may be applied to the case of manufacturing a coated steel sheet used for home electric appliances and the like. It goes without saying that the same can be applied.
[0019]
【The invention's effect】
Thus, according to the present invention, when a coating film is baked on the surface of a steel sheet, it can be baked in a short time only by the high-frequency induction heating method without deteriorating the film characteristics and the film appearance.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a view showing the effects of a reached plate temperature, a heating rate, and an induction heating frequency on coating characteristics and coating appearance.
FIG. 2 is a schematic diagram of a paint baking facility suitable for use in the practice of the present invention.
[Explanation of symbols]
Reference Signs List 1 continuous annealing furnace 2 coating
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002377833A JP4096732B2 (en) | 2002-12-26 | 2002-12-26 | Baking method of coating film by high frequency induction heating |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002377833A JP4096732B2 (en) | 2002-12-26 | 2002-12-26 | Baking method of coating film by high frequency induction heating |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2004204335A true JP2004204335A (en) | 2004-07-22 |
| JP4096732B2 JP4096732B2 (en) | 2008-06-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002377833A Expired - Lifetime JP4096732B2 (en) | 2002-12-26 | 2002-12-26 | Baking method of coating film by high frequency induction heating |
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| Country | Link |
|---|---|
| JP (1) | JP4096732B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPWO2013058318A1 (en) * | 2011-10-19 | 2015-04-02 | 古河電気工業株式会社 | Insulating paint, insulated wire, and method of manufacturing insulated wire |
| WO2019107834A1 (en) * | 2017-11-29 | 2019-06-06 | 삼성전자 주식회사 | Conductive member and electronic device comprising same |
| WO2020049854A1 (en) * | 2018-09-03 | 2020-03-12 | Ｊｆｅスチール株式会社 | Electromagnetic steel sheet having insulation coating film attached thereto, and method for producing same |
-
2002
- 2002-12-26 JP JP2002377833A patent/JP4096732B2/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPWO2013058318A1 (en) * | 2011-10-19 | 2015-04-02 | 古河電気工業株式会社 | Insulating paint, insulated wire, and method of manufacturing insulated wire |
| WO2019107834A1 (en) * | 2017-11-29 | 2019-06-06 | 삼성전자 주식회사 | Conductive member and electronic device comprising same |
| WO2020049854A1 (en) * | 2018-09-03 | 2020-03-12 | Ｊｆｅスチール株式会社 | Electromagnetic steel sheet having insulation coating film attached thereto, and method for producing same |
| CN112639165A (en) * | 2018-09-03 | 2021-04-09 | 杰富意钢铁株式会社 | Electromagnetic steel sheet with insulating coating and method for producing same |
| TWI732246B (en) * | 2018-09-03 | 2021-07-01 | 日商Ｊｆｅ鋼鐵股份有限公司 | Electromagnetic steel sheet with insulating coating and manufacturing method thereof |
| EP3808871A4 (en) * | 2018-09-03 | 2021-08-25 | JFE Steel Corporation | Electromagnetic steel sheet having insulation coating film attached thereto, and method for producing same |
| RU2770738C1 (en) * | 2018-09-03 | 2022-04-21 | ДжФЕ СТИЛ КОРПОРЕЙШН | Sheet of electrotechnical steel with an insulating film and method for manufacture thereof |
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