JP2004148163A - Method of repair-painting steel material - Google Patents
Method of repair-painting steel material Download PDFInfo
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- JP2004148163A JP2004148163A JP2002314259A JP2002314259A JP2004148163A JP 2004148163 A JP2004148163 A JP 2004148163A JP 2002314259 A JP2002314259 A JP 2002314259A JP 2002314259 A JP2002314259 A JP 2002314259A JP 2004148163 A JP2004148163 A JP 2004148163A
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- steel material
- rust
- repair
- coating
- stabilizer
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- 239000000463 material Substances 0.000 title claims abstract description 86
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 82
- 239000010959 steel Substances 0.000 title claims abstract description 82
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000010422 painting Methods 0.000 title claims abstract description 20
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims abstract description 89
- 239000003381 stabilizer Substances 0.000 claims abstract description 57
- 229920005989 resin Polymers 0.000 claims abstract description 35
- 239000011347 resin Substances 0.000 claims abstract description 35
- 150000001875 compounds Chemical class 0.000 claims abstract description 21
- 230000005540 biological transmission Effects 0.000 claims abstract description 17
- 239000003973 paint Substances 0.000 claims abstract description 15
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- 230000000087 stabilizing effect Effects 0.000 claims abstract description 4
- 238000000576 coating method Methods 0.000 claims description 80
- 239000011248 coating agent Substances 0.000 claims description 59
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- 239000003125 aqueous solvent Substances 0.000 claims description 11
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- 239000002174 Styrene-butadiene Substances 0.000 description 1
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- 235000004515 gallic acid Nutrition 0.000 description 1
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- 238000007591 painting process Methods 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 150000007965 phenolic acids Chemical class 0.000 description 1
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- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
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Images
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
Description
【０００１】
【発明の属する技術分野】
本発明は、送電用の鉄塔のように、風雨に曝され錆の発生した鉄鋼材料を、現場で補修塗装する方法に関する。
【０００２】
【従来の技術】
送電用の鉄塔のように、風雨に曝され錆の発生しやすい環境にある鉄鋼材料は、亜鉛メッキ等の防食処理がなされている。しかしながら、相当の時間が経過するとメッキが消耗し、鉄部分に水分が浸透し徐々に赤錆が発生する。このような赤錆は、外観の悪さのみならず、鉄鋼材料の強度の低下を招く要因ともなるため、しかるべきタイミングで現場で補修塗装することが必要である。
送電用の鉄塔を例に挙げると、従来、このような補修塗装方法としては、先ず、鉄塔の錆面をケレン処理し、その後鉄塔の処理面に対し下塗り塗装、上塗り塗装を施していた。ケレン処理は、素地の状態に応じて処理が行われるものであるが、一般的に、ディスクサンダー等の動力工具とスクレーパ、ハンマー等の手工具とを併用して、劣化塗膜を除去し、錆部分は金属面まで研ぎ出す３種ケレン程度の処理がなされる。このような素地の調整を十分に行っておかないと、その後下塗り塗装、上塗り塗装を行って形成する防食塗膜の付着性や防食性能を低下させる要因となり、防食塗膜の寿命を縮めてしまう。
【０００３】
上記の送電用鉄塔の補修塗装作業にあたって、以下のような問題点が挙げられる。送電用鉄塔の補修塗装作業は送電を停止して行わなくてはならないが、手作業で行うケレン処理の工程のためにかなりの時間を要し、送電停止時間を長引かせている。また、作業者にとっても身体的負担が大きい。更に、現場で行う作業ゆえ、均一な処理が難しく、仕上がりの不十分な箇所がある。
以上の問題点から、作業の簡易化と時間の短縮が可能で、仕上がりも均一な送電用鉄塔の補修塗装方法が望まれている。
【０００４】
一方、鉄鋼材料、特に耐候性鋼材の不安定錆が形成された表面に対して塗布して安定錆を形成することのできる、キレート変性エポキシ樹脂を含有する耐候性鋼材用塗料組成物が提案されている（特許文献１参照。）
また、鉄鋼材料の補修塗装作業を短時間化し、素地と塗料との密着性を向上させることを目的としてなされた鉄鋼材料の補修塗装施工方法、すなわち、錆の出た鉄鋼材料の表面をケレン処理して清浄にした後、リン酸および／又はその化合物と、ケイ素化合物と、アルコール系溶剤とを含有してなるｐＨ１〜５の下地被膜処理液を用いて下地用の防錆被膜を形成し、これを乾燥させ、次いで鉄鋼材料の表面に錆転換型の防錆塗料を用いて下塗り塗装を施して乾燥させ、最後にその上に上塗り塗装を施して乾燥させる工程からなる方法が提案されている（特許文献２参照。）
【０００５】
【特許文献１】
特開２００１−４０２８０号公報
【特許文献２】
特開２０００−１４０７４６号公報
【０００６】
【発明が解決しようとする課題】
本発明は、上記問題点に鑑みてなされたものであり、その課題は、送電用鉄塔等の構造用の鉄鋼材料に好適に用いることができ、作業の簡易化と時間の短縮が可能で、高い防食効果が得られる鉄鋼材料の補修塗装方法を提供することである。
【０００７】
【課題を解決するための手段】
上記課題を解決するために、請求項１に記載の発明は、錆の出た鉄鋼材料を現場で補修塗装する方法であって、鉄鋼材料の表面の脆い錆を叩いて落とす表面処理工程と、前記表面処理工程後の前記鉄鋼材料表面に錆安定化剤を塗布する錆安定化剤塗布工程と、前記錆安定化剤塗布工程後の前記鉄鋼材料表面に防食用の塗料を塗装する塗装工程とを含み、前記錆安定化塗布工程で使用する錆安定化剤は、キレート形成能を有する化合物を含有する樹脂と水系溶剤とを含んでなる鉄鋼材料の補修塗装方法である。
【０００８】
請求項２に記載の発明は、請求項１に記載の鉄鋼材料の補修塗装方法において、前記錆安定化剤が、キレート形成能を有する化合物としてタンニン酸誘導体を含有する樹脂を含んでなる鉄鋼材料の補修塗装方法である。
請求項３に記載の発明は、請求項１又は２に記載の鉄鋼材料の補修塗装方法において、前記錆安定化剤におけるキレート形成能を有する化合物の含有量が、樹脂全体に対し１〜２０重量％の鉄鋼材料の補修塗装方法である。
請求項４に記載の発明は、請求項１ないし３のいずれかに記載の鉄鋼材料の補修塗装方法において、前記錆安定化剤が、樹脂として塩化ビニリデン樹脂を含有する鉄鋼材料の補修塗装方法である。
請求項５に記載の発明は、請求項１ないし４のいずれかに記載の鉄鋼材料の補修塗装方法において、前記錆安定化剤中の前記キレート形成能を有する化合物を含有する樹脂の含有量が、５〜７０重量％の鉄鋼材料の補修塗装方法である。
【０００９】
請求項６に記載の発明は、請求項１ないし５のいずれかに記載の鉄鋼材料の補修塗装方法において、前記錆安定化剤に含まれる前記水系溶剤が、炭素数２〜１０のグリコールもしくはグリコールエーテルを含有する鉄鋼材料の補修塗装方法である。
請求項７に記載の発明は、請求項６に記載の鉄鋼材料の補修塗装方法において、前記錆安定化剤中の前記水系溶剤に含有されるグリコールもしくはグリコールエーテルの含有量が、前記錆安定化剤に対して１〜５０重量％の鉄鋼材料の補修塗装方法である。
請求項８に記載の発明は、請求項１ないし７のいずれかに記載の鉄鋼材料の補修塗装方法において、前記錆安定化剤塗布工程で前記鉄鋼材料表面に形成される塗膜の膜厚が、１〜５０μｍの鉄鋼材料の補修塗装方法である。
【００１０】
請求項９に記載の発明は、請求項１ないし８のいずれかに記載の鉄鋼材料の補修塗装方法において、前記鉄鋼材料が、送電用の鉄塔である鉄鋼材料の補修塗装方法である。
【００１１】
【発明の実施の形態】
以下に、本発明の実施の形態を説明する。
本発明の鉄鋼材料の補修塗装方法は、以下の工程を含んで鉄鋼材料に防食塗膜を形成する方法である。
１）鉄鋼材料の表面の脆い錆を叩いて落とす表面処理工程。
２）前記表面処理工程後の前記鉄鋼材料表面に錆安定化剤を塗布する錆安定化剤塗布工程。
３）前記錆安定化剤塗布工程後の前記鉄鋼材料表面に防食用の塗料を塗装する塗装工程。
以下、それぞれの工程について説明する。
【００１２】
１）表面処理工程
鉄鋼材料表面の浮き錆や層状の錆等、ハンマー等の手工具によって叩いて落ちる脆い錆を除去する。ケレン処理で使用するワイヤーブラシ、サンドペーパー等は特に必要としない。
【００１３】
２）錆安定化剤塗布工程
従来、ケレン処理により除去していた赤錆（Ｆｅ２Ｏ３）を、本発明の補修塗装方法では、錆安定化剤の塗布により、鉄原子を不動態化し、さらに塗膜を形成することで、その後その上に塗布される塗料との密着性をも得るものである。錆安定化剤の塗布は、刷毛塗り又はスプレー塗布でよく、短時間で効率的に行うことができる。
鉄原子を不動態化するのはキレート形成能を有する化合物であり、錆安定化剤は、これらの化合物を含有する樹脂と水系溶剤とを少なくとも含んでなる。キレート形成能を有する化合物としては、鉄原子とキレートを形成する化合物であればよく、多価フェノール類、フェノールカルボン酸類、クロム錯塩類、フタロシアニン類、ピリジン類等公知の化合物を用いることができる。この中でも、自然素材で環境にも優しい、五倍子タンニン、没食子タンニンを始めとするタンニン酸誘導体が好ましい。五倍子タンニン、没食子タンニン等のタンニン酸誘導体は、１分子中に多数の水酸基を有するため、１個の鉄原子を１分子でキレート化し、さらにネットワーク状の結合を形成することができる。このように、錆面のイオン化した鉄原子を介して互いに結合することで、極めて大きな分子量の有機金属分子となって、鉄鋼材料の表面を安定化させる効果が得られる。尚、タンニン酸誘導体中には、没食子酸、プロトカテキユ酸等の低分子の化合物が含まれていてもよい。
【００１４】
図１は、錆安定化剤の塗布工程における鉄鋼材料の表面状態を模式的に示す図である。図１（ａ）は、塗布前の状態を示し、図１（ｂ）は、塗布後の状態を示す。鉄鋼材料表面に錆安定化剤を塗布すると、図１（ａ）に示す錆面に錆安定化剤が浸透していき、鉄原子を取り込んでキレート化する。図１（ｂ）の鉄鋼材料表面は黒変しており、赤錆の２価の鉄原子はキレート化反応によってイオン状態が変化したことが確認できる。また、錆安定化剤に含まれる水系溶剤が揮発することで、樹脂による塗膜が形成され、その後の塗装に好適な平滑な表面を得ることができる。
【００１５】
上記のキレート形成能を有する化合物の含有量は、樹脂全体に対し、１〜２０重量％であることが好ましい。含有量が１重量％未満では、キレート形成による鉄原子不動態化の効果を十分に得ることができない。また、２０重量％を超えると、過剰となったキレート形成能を有する化合物が残留することになり、耐アルカリ性、耐水性等が低下し、塗膜の形成が不良となる。
【００１６】
樹脂としては、錆安定化剤が水系溶剤を用いることから、水系溶剤に可溶、もしくはエマルジョン形成が容易な樹脂が好ましく、ビニル樹脂、塩化ビニリデン樹脂、アクリル酸樹脂、スチレン−ブタジエン樹脂、エポキシ樹脂、ウレタン樹脂等が挙げられる。
この中でも、特に塩化ビニリデン樹脂が好ましい。塩化ビニリデン樹脂を用いた場合、他の樹脂に比べて、先に示したキレート形成能を有する化合物によるキレート化反応が最も進行しやすいｐＨ２〜４に調整しやすく、好適だからである。加えて、塩化ビニリデン樹脂によって形成される塗膜は、耐水性に優れ、塗膜強度も高く、乾燥性、防食性にも優れている。
尚、必要に応じて、特に塩化ビニリデン樹脂以外の樹脂を用いる場合は、リン酸、リン酸塩、リン酸エステル等のｐＨ調整剤を添加して、ｐＨを調整することができる。ｐＨ調整剤の添加量は、樹脂に対して１〜３０重量％、好ましくは１〜１０重量％の範囲である。
【００１７】
錆安定化剤中に含有される、上記キレート形成能を有する化合物を含有する樹脂の量は、５〜７０重量％であることが好ましい。５重量％未満では、形成される塗膜の膜厚が薄すぎ、塗膜強度を十分に得ることができない。また、防食性にも劣るものになる。７０重量％を超えると、錆安定化剤の粘度が高くなるため、鉄鋼材料の錆面への浸透性が低下し、鉄原子のキレート化反応が良好に進行しなくなる。
【００１８】
錆安定化剤に含まれる水系溶剤としては、水とアルコール系溶剤とを混合して用いることができる。アルコール系溶剤の中には、炭素数２〜１０のグリコールもしくはグリコールエーテルを含有することが好ましい。具体的には、エチレングリコール、エチレングリコールモノメチルエーテル、エチレングリコールジメチルエーテル、エチレングリコールモノ−ｎ−ブチルエーテル、エチレングリコールモノ−ｔ−ブチルエーテル、プロピレングリコール、プロピレングリコールモノメチルエーテル、３−メトキシ−３−メチル−１−ブタノール、ジエチレングリコールジメチルエーテル等が挙げられる。これらのグリコールもしくはグリコールエーテルは、揮発性が高くないことから、タンニン酸等のキレート形成能を有する化合物と錆との接触時間を増加させることができる。
水系溶剤中に含有される上記のグリコールもしくはグリコールエーテルの含有量は、錆安定化剤に対して１〜５０重量％が好ましい。これらの範囲で錆安定化剤を調製することにより、冬場の低温環境から夏場の高温環境に至るあらゆる環境化において、キレート化反応の十分な進行と、良好な塗膜形成が可能となる。
【００１９】
錆安定化剤には、この他に、適宜、消泡剤、レベリング剤を添加して調製する。消泡剤を加えることで、塗膜中の気泡の生成を抑え、レベリング剤によって塗膜の平滑性を向上させることができる。
【００２０】
上記錆安定化剤を刷毛又はスプレーにより鉄鋼材料表面に塗布した後、３０分〜２時間程度放置し、乾燥塗膜を得る。図１にも示したように、時間の経過と共に鉄鋼材料表面の赤錆が黒変するのが目視で確認できる。このようにして得られる乾燥塗膜の膜厚は、１〜５０μｍが好ましい。より好ましくは、１〜２０μｍである。膜厚が１μｍ未満では、薄すぎて十分な塗膜強度を得ることができない。また、防食性も低下する。膜厚が５０μｍを超えると、塗膜の乾燥性に悪影響を及ぼし、短期間の停電工事に対応できなくなる。
【００２１】
３）塗装工程
錆安定化剤による塗膜が形成された鉄鋼材料表面に、防食用の塗料を塗装する。防食用の塗料としては、一般的に使用されているアクリル樹脂、アクリルシリコーン樹脂、ポリウレタン樹脂、変性エポキシ樹脂等の塗料を用いることができる。また、例えば亜鉛成分を含有した錆止め塗料を下塗りし、乾燥した後、上記の塗料を上塗り塗料として重ね塗りしてもよい。塗装・乾燥の後、鉄鋼材料表面に形成される塗膜の総膜厚（錆安定化剤による塗膜も含む）は、２０〜２００μｍとなるようにするのが好ましい。
【００２２】
本発明の鉄鋼材料の補修塗装方法により、従来行っていたケレン処理を省くことができるため、作業時間の大幅な短縮を図ることができる。また、錆安定化剤塗布工程も、刷毛塗り、スプレー塗装等で行うことができる簡易な作業である。さらに、錆安定化剤の塗布により鉄原子を不動態化して、なおかつ形成される塗膜で水分、酸素等の侵入を防ぐため、高い防食効果を得ることができる。
本発明の鉄鋼材料の補修塗装方法は、特に、送電用の鉄塔の補修塗装作業に好適に用いることができる。送電用の鉄塔は、従来、送電を停止して補修塗装作業を行っていたが、この送電停止時間を大幅に短縮できると共に、作業の簡易化により、作業者への身体的負担も大幅に低減することができる。また、仕上がり状態も非常に良好で、高い防食効果を得ることができる。
【００２３】
【実施例】
以下に実施例を示し、本発明をより具体的に説明する。
（実施例１）
＜錆安定化剤の調製＞
五倍子タンニンを含有する塩化ビニリデン樹脂として、旭電化社製アデカレジンＥＰ７７７（商品名）を用い、以下の配合で錆安定化剤を調製した。尚、アデカレジンＥＰ７７７の配合量は、アデカレジンＥＰ７７７中の塩化ビニリデン樹脂含有量が５０重量％であることをもとに算出した。また、それぞれの単位は重量％を示す。
・アデカレジンＥＰ７７７ ７５％
・３−メトキシ−３−メチル−１−ブタノール ５％
・プロピレングリコールモノメチルエーテル ２．４９％
・プロピレングリコール ２％
・水 １５％
・消泡剤 ０．０１％
・レベリング剤 ０．５０％
【００２４】
試験片として、劣化した鉄塔撤去部材（溶融亜鉛メッキ鋼材）を使用した。試験片表面の浮き錆を軽く叩いて落とした後、上記の錆安定化剤を刷毛を用いて塗布した。２時間乾燥させた後、１５μｍの塗膜を得た。その後、試験片表面にアクリルシリコーン樹脂系塗料を塗布し、乾燥させて５０μｍの塗膜を得た。上記試験片について、塗膜の防食性能をＪＩＳ Ｋ ５４００耐塩水噴霧試験に準じて評価した。
【００２５】
（比較例１）
実施例１と同様の試験片を用い、試験片の表面を３種ケレン処理した後、アクリルシリコーン樹脂系塗料を塗布し、乾燥させて５０μｍの塗膜を得た。実施例１と同様に、塗膜の防食性能をＪＩＳ Ｋ ５４００耐塩水噴霧試験に準じて評価した。
【００２６】
図２は、塩水噴霧試験を行った試験片の写真である。試験片の中央を境に上半分が実施例１に相当する部分であり、下半分が比較例１に相当する部分である。左の写真は、実施例１が錆安定化剤を塗布した後の状態、比較例１が３種ケレン処理後の状態である。中央の写真は、試験片表面にアクリルシリコーン樹脂系塗料を塗布した状態であり、試験片に実施例１、比較例１の相違は見られず、一様に塗膜が形成されている。右の写真は、塩水噴霧試験７２０時間後の試験片の状態である。試験片には赤錆が発生しているが、比較例１に相当する下半分には表面の広範囲に渡って錆が発生しているのに対し、実施例１に相当する上半分の錆の発生は抑えられている。これは、錆安定化剤の塗布により、赤錆が安定化されて、その後の鉄鋼材料の腐食が抑制されているものであり、従来の３種ケレン処理よりも高い防食効果が得られることが分かる。
【００２７】
【発明の効果】
以上説明してきたように、本発明により、現場での鉄鋼材料の補修塗装作業を簡易化することができ、作業時間も短縮することができる。また、錆安定化剤の塗布により、錆を安定化することで、高い防食効果を得ることができる。特に、送電用鉄塔の補修塗装作業には好適であり、従来行っていたケレン処理を省くことができ、作業時間の大幅な短縮が図れると共に、ケレン処理を含んだ補修塗装方法よりも高い防食効果を得ることができる。
【図面の簡単な説明】
【図１】錆安定化剤の塗布工程における鉄鋼材料の表面状態を模式的に示す図である。
【図２】塩水噴霧試験を行った試験片の写真である。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method of repair-painting a steel material that has been exposed to wind and rain and has rust, such as a power transmission tower, on site.
[0002]
[Prior art]
Like steel towers for power transmission, steel materials that are exposed to the weather and are likely to rust are subjected to anticorrosion treatment such as galvanization. However, after a considerable period of time, the plating is consumed, and moisture penetrates into the iron part, and red rust is gradually generated. Such red rust causes not only poor appearance but also a reduction in the strength of the steel material, so it is necessary to perform repair painting on site at an appropriate timing.
Taking a tower for power transmission as an example, conventionally, as such a repair coating method, first, a rusted surface of the tower is subjected to a kerosene treatment, and then the treated surface of the tower is subjected to undercoating and topcoating. Keren treatment is a treatment that is performed according to the state of the substrate, but in general, using a power tool such as a disc sander and a scraper, a hand tool such as a hammer, to remove the deteriorated coating film, The rusted part is treated with about three kinds of keren to grind to the metal surface. If such adjustment of the base material is not performed sufficiently, it will be a factor that lowers the adhesion and the anticorrosion performance of the anticorrosion coating film formed by performing the undercoating and the overcoating thereafter, and shortens the life of the anticorrosion coating film. .
[0003]
The following problems are involved in the repair painting work of the power transmission tower. The repair painting of the power transmission tower must be performed after the power transmission is stopped, but it takes a considerable amount of time to perform the manual cleaning process, which prolongs the power transmission stoppage time. In addition, the physical burden on the worker is large. Furthermore, since the work is performed on site, uniform processing is difficult, and there are places where the finish is insufficient.
In view of the above problems, there is a demand for a method for repairing and coating a power transmission tower that can simplify the operation and reduce the time, and has a uniform finish.
[0004]
On the other hand, a coating composition for a weather-resistant steel material containing a chelate-modified epoxy resin, which can be applied to a surface of an iron-steel material, particularly a weather-resistant steel material on which unstable rust is formed to form stable rust, has been proposed. (See Patent Document 1).
In addition, the method of repair painting of steel materials was conducted to shorten the time required for repair painting of steel materials and improve the adhesion between the base material and the paint. After cleaning, a rust preventive coating for a base is formed using a base coating treatment solution having a pH of 1 to 5 containing phosphoric acid and / or a compound thereof, a silicon compound, and an alcohol-based solvent, A method has been proposed in which this is dried, followed by applying a base coat using a rust-preventive rust preventive paint on the surface of the steel material and drying, and finally applying a top coat thereon and drying. (See Patent Document 2)
[0005]
[Patent Document 1]
JP 2001-40280 A [Patent Document 2]
JP 2000-140746 A
[Problems to be solved by the invention]
The present invention has been made in view of the above problems, the problem is that it can be suitably used for structural steel materials such as power transmission towers, it is possible to simplify the work and shorten the time, An object of the present invention is to provide a repair coating method for a steel material capable of obtaining a high anticorrosion effect.
[0007]
[Means for Solving the Problems]
In order to solve the above problem, the invention according to claim 1 is a method of repair-painting a rusted steel material on site, and a surface treatment step of hitting and dropping brittle rust on the surface of the steel material, A rust stabilizer application step of applying a rust stabilizer to the steel material surface after the surface treatment step, and a coating step of applying an anticorrosion paint to the steel material surface after the rust stabilizer application step. And a rust stabilizing agent used in the rust stabilizing coating step is a method for repairing and coating a steel material comprising a resin containing a compound having chelating ability and an aqueous solvent.
[0008]
According to a second aspect of the present invention, in the method for repairing and coating a steel material according to the first aspect, the rust stabilizing agent includes a resin containing a tannic acid derivative as a compound having chelate forming ability. Repair painting method.
According to a third aspect of the present invention, in the method for repairing and coating a steel material according to the first or second aspect, the content of the compound having chelating ability in the rust stabilizer is 1 to 20% by weight based on the whole resin. % Is a method of repair painting steel materials.
According to a fourth aspect of the present invention, there is provided the repair and coating method for a steel material according to any one of the first to third aspects, wherein the rust stabilizing agent comprises a vinylidene chloride resin as a resin. is there.
According to a fifth aspect of the present invention, in the method for repairing and coating a steel material according to any one of the first to fourth aspects, the content of the resin containing the chelate-forming compound in the rust stabilizer is reduced. , 5 to 70% by weight of a steel material.
[0009]
According to a sixth aspect of the present invention, in the method for repairing and coating a steel material according to any one of the first to fifth aspects, the aqueous solvent contained in the rust stabilizer comprises a glycol having 2 to 10 carbon atoms or a glycol. This is a repair coating method for steel materials containing ether.
According to a seventh aspect of the present invention, in the repair and coating method for a steel material according to the sixth aspect, the content of glycol or glycol ether contained in the aqueous solvent in the rust stabilizer is reduced. This is a repair coating method for a steel material in an amount of 1 to 50% by weight of the agent.
The invention according to claim 8 is a method for repairing and coating a steel material according to any one of claims 1 to 7, wherein a film thickness of a coating film formed on the surface of the steel material in the rust stabilizing agent applying step is reduced. , A repair coating method for a steel material of 1 to 50 μm.
[0010]
According to a ninth aspect of the present invention, there is provided the method for repairing and coating a steel material according to any one of the first to eighth aspects, wherein the steel material is a steel tower for power transmission.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described.
The repair coating method for a steel material according to the present invention is a method for forming an anticorrosion coating film on a steel material including the following steps.
1) A surface treatment step of hitting and dropping brittle rust on the surface of a steel material.
2) A rust stabilizer application step of applying a rust stabilizer to the surface of the steel material after the surface treatment step.
3) a coating step of applying a corrosion-resistant paint to the surface of the steel material after the rust stabilizer applying step;
Hereinafter, each step will be described.
[0012]
1) Surface treatment step Removes brittle rust that hits with a hand tool such as a hammer, such as floating rust or layered rust on the surface of a steel material. There is no particular need for a wire brush, sandpaper, or the like used in the Keren treatment.
[0013]
2) Rust stabilizing agent coating step In the repair coating method of the present invention, red rust (Fe 2 O 3 ), which has been conventionally removed by a kelen treatment, is passivated by applying a rust stabilizing agent to further passivate iron atoms. By forming a coating film, the adhesiveness with a paint applied thereon is also obtained. The rust stabilizer can be applied by brush coating or spray application, and can be efficiently performed in a short time.
It is compounds having chelating ability that passivate iron atoms, and the rust stabilizer comprises at least a resin containing these compounds and an aqueous solvent. The compound capable of forming a chelate may be any compound capable of forming a chelate with an iron atom, and known compounds such as polyhydric phenols, phenol carboxylic acids, chromium complex salts, phthalocyanines, and pyridines can be used. Among them, tannic acid derivatives such as pentaploid tannin and gallic tannin, which are natural materials and are environmentally friendly, are preferable. Since tannic acid derivatives such as quintuple tannin and gallic tannin have a large number of hydroxyl groups in one molecule, one iron atom can be chelated by one molecule and a network-like bond can be formed. As described above, by bonding to each other via the ionized iron atoms on the rust surface, the metal particles become organometallic molecules having an extremely large molecular weight, and the effect of stabilizing the surface of the steel material can be obtained. The tannic acid derivative may contain low molecular compounds such as gallic acid and protocatechuic acid.
[0014]
FIG. 1 is a diagram schematically illustrating a surface state of a steel material in a step of applying a rust stabilizer. FIG. 1A shows a state before the application, and FIG. 1B shows a state after the application. When a rust stabilizer is applied to the surface of a steel material, the rust stabilizer penetrates into the rust surface shown in FIG. The surface of the steel material shown in FIG. 1B is blackened, and it can be confirmed that the divalent iron atom of red rust has changed its ionic state due to the chelation reaction. In addition, a water-based solvent contained in the rust stabilizer volatilizes, whereby a coating film of a resin is formed, and a smooth surface suitable for subsequent coating can be obtained.
[0015]
The content of the compound having chelating ability is preferably 1 to 20% by weight based on the whole resin. If the content is less than 1% by weight, the effect of iron atom passivation due to chelate formation cannot be sufficiently obtained. On the other hand, if it exceeds 20% by weight, the compound having an excessive chelate-forming ability will remain, and the alkali resistance, water resistance and the like will be reduced, and the formation of a coating film will be poor.
[0016]
As the resin, since the rust stabilizer uses an aqueous solvent, a resin that is soluble in an aqueous solvent or easily forms an emulsion is preferable, and a vinyl resin, a vinylidene chloride resin, an acrylic resin, a styrene-butadiene resin, and an epoxy resin are used. And urethane resins.
Among them, vinylidene chloride resin is particularly preferable. This is because, when a vinylidene chloride resin is used, it is easier to adjust the pH to 2 to 4 where the chelation reaction by the compound having the chelate-forming ability described above proceeds most easily than the other resins, which is preferable. In addition, the coating film formed by the vinylidene chloride resin has excellent water resistance, high coating film strength, and excellent drying properties and corrosion resistance.
If necessary, particularly when a resin other than the vinylidene chloride resin is used, the pH can be adjusted by adding a pH adjuster such as phosphoric acid, a phosphate or a phosphate ester. The amount of the pH adjuster is in the range of 1 to 30% by weight, preferably 1 to 10% by weight, based on the resin.
[0017]
The amount of the resin containing the compound having the chelate-forming ability contained in the rust stabilizer is preferably from 5 to 70% by weight. If the amount is less than 5% by weight, the thickness of the formed coating film is too small, so that sufficient coating film strength cannot be obtained. Further, the anticorrosion property is also poor. If it exceeds 70% by weight, the viscosity of the rust stabilizer increases, so that the permeability of the steel material to the rust surface decreases, and the chelation reaction of iron atoms does not proceed well.
[0018]
As the aqueous solvent contained in the rust stabilizer, water and an alcohol solvent can be mixed and used. It is preferable that the alcohol solvent contains a glycol or glycol ether having 2 to 10 carbon atoms. Specifically, ethylene glycol, ethylene glycol monomethyl ether, ethylene glycol dimethyl ether, ethylene glycol mono-n-butyl ether, ethylene glycol mono-t-butyl ether, propylene glycol, propylene glycol monomethyl ether, 3-methoxy-3-methyl-1 -Butanol, diethylene glycol dimethyl ether and the like. Since these glycols or glycol ethers do not have high volatility, the contact time between rust and a compound capable of forming a chelate such as tannic acid can be increased.
The content of the glycol or glycol ether contained in the aqueous solvent is preferably 1 to 50% by weight based on the rust stabilizer. By preparing the rust stabilizer within these ranges, the chelating reaction can proceed sufficiently and a good coating film can be formed in any environment from a low temperature environment in winter to a high temperature environment in summer.
[0019]
The rust stabilizer is prepared by appropriately adding an antifoaming agent and a leveling agent in addition to the above. By adding an antifoaming agent, the generation of bubbles in the coating film can be suppressed, and the leveling agent can improve the smoothness of the coating film.
[0020]
After the rust stabilizer is applied to the surface of the steel material by brush or spray, it is left for about 30 minutes to 2 hours to obtain a dry coating film. As shown in FIG. 1, it can be visually confirmed that red rust on the surface of the steel material turns black over time. The thickness of the dried coating film thus obtained is preferably 1 to 50 μm. More preferably, it is 1 to 20 μm. If the film thickness is less than 1 μm, it is too thin to obtain sufficient coating film strength. Further, the anticorrosion property is also reduced. When the film thickness exceeds 50 μm, the drying property of the coating film is adversely affected, and it is impossible to cope with short-term power outage work.
[0021]
3) Painting process The anticorrosion paint is applied to the surface of the steel material on which the coating film formed by the rust stabilizer is formed. As the anticorrosion paint, generally used paints such as acrylic resin, acrylic silicone resin, polyurethane resin, and modified epoxy resin can be used. Further, for example, a rust preventive paint containing a zinc component may be undercoated and dried, and then the above paint may be overcoated as a topcoat paint. After coating and drying, the total thickness of the coating film formed on the surface of the steel material (including the coating film formed by the rust stabilizer) is preferably adjusted to 20 to 200 μm.
[0022]
According to the method for repairing and coating a steel material of the present invention, it is possible to omit the conventional quenching treatment, so that the working time can be significantly reduced. The rust stabilizer application step is also a simple operation that can be performed by brush coating, spray coating, or the like. Further, since the iron atoms are passivated by applying a rust stabilizer and the intrusion of moisture, oxygen and the like in the formed coating film is prevented, a high anticorrosion effect can be obtained.
The repair coating method for steel materials of the present invention can be suitably used particularly for repair coating work on a power transmission tower. In the past, power transmission towers had been used for repair painting work by stopping power transmission.However, this power transmission stoppage time can be greatly reduced, and the simplification of the work significantly reduces the physical burden on workers. can do. The finished state is also very good, and a high anticorrosion effect can be obtained.
[0023]
【Example】
Hereinafter, the present invention will be described more specifically with reference to Examples.
(Example 1)
<Preparation of rust stabilizer>
As a vinylidene chloride resin containing quintuple tannin, Adeka Resin EP777 (trade name) manufactured by Asahi Denka Co., Ltd. was used to prepare a rust stabilizer with the following composition. The blending amount of Adeka Resin EP777 was calculated based on the vinylidene chloride resin content in Adeka Resin EP777 being 50% by weight. Also, each unit indicates% by weight.
・ Adeka Resin EP777 75%
-3-methoxy-3-methyl-1-butanol 5%
・ Propylene glycol monomethyl ether 2.49%
・ Propylene glycol 2%
・ Water 15%
・ Defoamer 0.01%
・ Leveling agent 0.50%
[0024]
A deteriorated steel tower removal member (hot-dip galvanized steel material) was used as a test piece. After the floating rust on the surface of the test piece was lightly tapped and dropped, the above rust stabilizer was applied using a brush. After drying for 2 hours, a coating film of 15 μm was obtained. Thereafter, an acrylic silicone resin-based paint was applied to the surface of the test piece and dried to obtain a 50 μm coating film. With respect to the above test pieces, the anticorrosion performance of the coating film was evaluated according to JIS K 5400 salt spray test.
[0025]
(Comparative Example 1)
Using the same test piece as in Example 1, the surface of the test piece was treated with three types of ketones, and then an acrylic silicone resin-based paint was applied and dried to obtain a 50 μm coating film. As in Example 1, the anticorrosion performance of the coating film was evaluated according to JIS K 5400 salt spray test.
[0026]
FIG. 2 is a photograph of a test piece subjected to a salt spray test. The upper half corresponds to Example 1 and the lower half corresponds to Comparative Example 1 from the center of the test piece. The photograph on the left shows the state of Example 1 after the application of the rust stabilizer, and the state of Comparative Example 1 after the treatment with three kinds of kerosene. The photograph in the center shows a state in which an acrylic silicone resin-based coating material has been applied to the surface of the test piece. No difference between Example 1 and Comparative Example 1 is seen on the test piece, and a uniform coating film is formed. The photograph on the right shows the test piece after 720 hours of the salt spray test. Although red rust was generated on the test piece, the lower half corresponding to Comparative Example 1 had rust over a wide area of the surface, whereas the upper half corresponding to Example 1 had rust generated. Is suppressed. This indicates that red rust is stabilized by the application of the rust stabilizer, and the subsequent corrosion of the steel material is suppressed, and it can be seen that a higher anticorrosion effect can be obtained than in the conventional three-kind treatment. .
[0027]
【The invention's effect】
As described above, according to the present invention, the repair painting work of a steel material on site can be simplified, and the work time can be shortened. In addition, by applying a rust stabilizer to stabilize rust, a high anticorrosion effect can be obtained. In particular, it is suitable for repair painting work of power transmission towers, and can omit the conventional Keren treatment, greatly shortening the work time, and has a higher anticorrosion effect than the repair painting method including Keren treatment Can be obtained.
[Brief description of the drawings]
FIG. 1 is a view schematically showing a surface state of a steel material in a step of applying a rust stabilizer.
FIG. 2 is a photograph of a test piece subjected to a salt spray test.
Claims (9)
鉄鋼材料の表面の脆い錆を叩いて落とす表面処理工程と、
前記表面処理工程後の前記鉄鋼材料表面に錆安定化剤を塗布する錆安定化剤塗布工程と、
前記錆安定化剤塗布工程後の前記鉄鋼材料表面に防食用の塗料を塗装する塗装工程とを含み、
前記錆安定化塗布工程で使用する錆安定化剤は、キレート形成能を有する化合物を含有する樹脂と水系溶剤とを含んでなる
ことを特徴とする鉄鋼材料の補修塗装方法。It is a method of repair painting rusted steel material on site,
A surface treatment step of hitting and dropping brittle rust on the surface of the steel material,
A rust stabilizer applying step of applying a rust stabilizer to the steel material surface after the surface treatment step,
A coating step of coating a corrosion-resistant paint on the surface of the steel material after the rust stabilizer applying step,
A method for repairing and coating steel materials, wherein the rust stabilizing agent used in the rust stabilizing coating step comprises a resin containing a compound capable of forming chelate and an aqueous solvent.
前記錆安定化剤は、キレート形成能を有する化合物としてタンニン酸誘導体を含有する樹脂を含んでなる
ことを特徴とする鉄鋼材料の補修塗装方法。The repair coating method for a steel material according to claim 1,
The repair coating method for a steel material, wherein the rust stabilizer comprises a resin containing a tannic acid derivative as a compound having a chelate forming ability.
ことを特徴とする鉄鋼材料の補修塗装方法。3. The method of repair coating a steel material according to claim 1, wherein the rust stabilizer has a content of a compound having a chelate-forming ability of 1 to 20% by weight based on the whole resin. 4. Repair painting method for steel materials.
前記錆安定化剤は、樹脂として塩化ビニリデン樹脂を含有する
ことを特徴とする鉄鋼材料の補修塗装方法。The repair coating method for a steel material according to any one of claims 1 to 3,
The method for repairing and coating steel materials, wherein the rust stabilizer contains a vinylidene chloride resin as a resin.
前記錆安定化剤中の前記キレート形成能を有する化合物を含有する樹脂の含有量は、５〜７０重量％である
ことを特徴とする鉄鋼材料の補修塗装方法。The repair coating method for a steel material according to any one of claims 1 to 4,
The repair coating method for a steel material, wherein a content of the resin containing the compound having a chelate forming ability in the rust stabilizer is 5 to 70% by weight.
前記錆安定化剤に含まれる前記水系溶剤は、炭素数２〜１０のグリコールもしくはグリコールエーテルを含有する
ことを特徴とする鉄鋼材料の補修塗装方法。The repair coating method for a steel material according to any one of claims 1 to 5,
The repair coating method for a steel material, wherein the aqueous solvent contained in the rust stabilizer contains glycol or glycol ether having 2 to 10 carbon atoms.
前記錆安定化剤中の前記水系溶剤に含有されるグリコールもしくはグリコールエーテルの含有量は、前記錆安定化剤に対して１〜５０重量％である
ことを特徴とする鉄鋼材料の補修塗装方法。The method for repairing and coating steel materials according to claim 6,
The repair coating method for a steel material, wherein the content of glycol or glycol ether contained in the aqueous solvent in the rust stabilizer is 1 to 50% by weight based on the rust stabilizer.
前記錆安定化剤塗布工程で前記鉄鋼材料表面に形成される塗膜の膜厚は、１〜５０μｍである
ことを特徴とする鉄鋼材料の補修塗装方法。The repair coating method for a steel material according to any one of claims 1 to 7,
The repair coating method for a steel material, wherein a thickness of a coating film formed on the surface of the steel material in the rust stabilizer applying step is 1 to 50 μm.
前記鉄鋼材料は、送電用の鉄塔である
ことを特徴とする鉄鋼材料の補修塗装方法。The repair coating method for a steel material according to any one of claims 1 to 8,
The method for repairing and coating a steel material, wherein the steel material is a power transmission tower.
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| JP2002314259A JP2004148163A (en) | 2002-10-29 | 2002-10-29 | Method of repair-painting steel material |
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|---|---|---|---|
| JP2002314259A JP2004148163A (en) | 2002-10-29 | 2002-10-29 | Method of repair-painting steel material |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007061760A (en) * | 2005-09-01 | 2007-03-15 | Chuden Kogyo Kk | Anticorrosive coating method of power transmission steel tower |
| JP2010185180A (en) * | 2009-02-10 | 2010-08-26 | Nippon Tetto Kogyo Kk | Method for repairing zinc coating of steel structure |
| JP2014169486A (en) * | 2013-03-04 | 2014-09-18 | Plaza Of Legacy:Kk | Rust converting agent for corrosion protection |
| JP2016056411A (en) * | 2014-09-10 | 2016-04-21 | 東京電力株式会社 | Rust treatment agent for galvanized steel and repair method using the same |
| JP2017002117A (en) * | 2015-06-04 | 2017-01-05 | クスノキ化学株式会社 | Antirust primer coating and repair coating construction method using antirust primer coating |
| JP6362203B1 (en) * | 2018-02-19 | 2018-07-25 | 株式会社 Ａｇｕａ Ｊａｐａｎ | Rust conversion method |
| JP2019111488A (en) * | 2017-12-22 | 2019-07-11 | 関西ペイント株式会社 | Anticorrosion coating method for rust surface |
| CN116063908A (en) * | 2023-01-18 | 2023-05-05 | 鞍钢股份有限公司 | Rust layer repairing agent for outdoor service weathering steel and use method thereof |
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2002
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007061760A (en) * | 2005-09-01 | 2007-03-15 | Chuden Kogyo Kk | Anticorrosive coating method of power transmission steel tower |
| JP2010185180A (en) * | 2009-02-10 | 2010-08-26 | Nippon Tetto Kogyo Kk | Method for repairing zinc coating of steel structure |
| JP2014169486A (en) * | 2013-03-04 | 2014-09-18 | Plaza Of Legacy:Kk | Rust converting agent for corrosion protection |
| JP2016056411A (en) * | 2014-09-10 | 2016-04-21 | 東京電力株式会社 | Rust treatment agent for galvanized steel and repair method using the same |
| JP2017002117A (en) * | 2015-06-04 | 2017-01-05 | クスノキ化学株式会社 | Antirust primer coating and repair coating construction method using antirust primer coating |
| JP2019111488A (en) * | 2017-12-22 | 2019-07-11 | 関西ペイント株式会社 | Anticorrosion coating method for rust surface |
| JP6362203B1 (en) * | 2018-02-19 | 2018-07-25 | 株式会社 Ａｇｕａ Ｊａｐａｎ | Rust conversion method |
| CN116063908A (en) * | 2023-01-18 | 2023-05-05 | 鞍钢股份有限公司 | Rust layer repairing agent for outdoor service weathering steel and use method thereof |
| CN116063908B (en) * | 2023-01-18 | 2024-04-16 | 鞍钢股份有限公司 | Rust layer repairing agent for outdoor service weathering steel and use method thereof |
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