JP4435336B2 - How to paint a ship or steel structure - Google Patents

Description

【００３６】
［式中、Ｒ¹ はＨまたはＣＨ₃ であり、
Ｒ² は−ＣＨ₂−または−Ｃ（ＣＨ₃）₂−であり、
ｎは３０〜２００である。］
上記の隣接水酸基を有する多価フェノールカルボン酸多価アルコールエステルは、エチレングリコール、プロピレングリコール、ペンタエリスリトール等の多価アルコールと、カテコール-3- カルボン酸、没食子酸、ピロガロール-4,6-ジカルボン酸等の多価フェノールカルボン酸とのエステル化合物である。
【００３７】
上記の歴青質物質としては、たとえば石炭粉末をコールタールとコールタールピッチの混合物で３００℃以上の高温で膨潤させた、いわゆる膨潤炭などが挙げられる。
特公昭６２−４７９０７号公報に開示されている防食塗料組成物は、
（ｉ）上記一般式においてｎが５〜３０である以外は同じ式で表わされるエポキシ樹脂と、隣接水酸基を有する多価フェノールカルボン酸、隣接水酸基を有する多価フェノール多価アルコールエステルまたは隣接水酸基を有する多核多価フェノールとを溶剤中で反応せしめて得られる高分子量反応生成物（変性エポキシ樹脂）と、
（ii）歴青質物質と、
（iii)ジンククロメートと
を必須成分とする防食塗料組成物である。
【００３８】
上記の隣接水酸基を有する多価フェノールカルボン酸としては、たとえばカテコール-3- カルボン酸、没食子酸、ピロガロール-4,6-ジカルボン酸などが挙げられる。
上記の隣接水酸基を有する多核多価フェノールとしては、たとえばカテコール、ピロガロール、タンニン酸などが挙げられる。
【００３９】
特公平３−４９９４９号公報に開示されている防食塗料は、
（ｉ）上記一般式においてｎが５〜３０である以外は同じ式で表わされるエポキシ樹脂と、隣接水酸基を有する多価フェノールカルボン酸多価アルコールエステルまたは隣接水酸基を有する多核多価フェノールとを溶剤中で反応せしめて得られる高分子量反応生成物（変性エポキシ樹脂）１００重量部と、
（ii）石炭系歴青質物質３０〜６００重量部と、
（iii)重量平均分子量が２００〜５００００である液状合成ゴム０〜５０重量部とを含有してなる防食塗料組成物である。
【００４０】
上記の液状合成ゴムとしては、たとえばブタジエン、クロロプレンおよびネオプレンの中から選ばれた少なくとも一種の共役二重結合を有する化合物の単独または共重合体などが挙げられる。
これらの防食塗料組成物の色調は淡いものが好ましい。何故ならば、淡い色調の防食塗料組成物でタッチアップ塗装すると、鋼板面におけるピット（食孔）、アンダーカット、クラック等の目視による発見が容易となるからである。
【００４１】
これらの防食塗料組成物は、船舶特にタンクの内部表面に塗装する重防食塗料として好適であり、石油備蓄タンク、各種陸上プラント、橋桁の内面、その他の鋼構造物の防食塗料として用いることができる。
上記のような防食塗料で鋼材の表面に発生している錆の上からタッチアップ塗装すると、その錆の範囲の拡大を防止できる。このようなタッチアップ塗装は、船舶外板および船舶タンク、特にウォーターバラストタンク等のバラストタンクの内面塗装に適している。
【００４２】
このタッチアップ塗装は、従来公知のタッチアップ塗装方法にて行なうことができる。
タッチアップ塗装で用いられる防食塗料としては、たとえば中国塗料（株）より「ビスマックス」（変性タールエポキシ樹脂塗料）、「ユメガードＰＵ」（変性エポキシウレタン樹脂塗料）、「ユメガードＰＵ−ＴＵ」（エポキシポリウレタン樹脂塗料）、「スーパーボンデックスＴ」（変性エポキシ樹脂塗料）、「ユメガードＳＸ」（変性エポキシ樹脂）の商品名で市販されている防食塗料を挙げることができる。
【００４３】
［上塗り塗装］
ウォーターブラスト処理後、または上記の防食塗料によるタッチアップ塗装後の上塗り塗装で用いられる上塗り塗料は、上記のジンク系ショッププライマー以外の塗料である。
船舶の場合、その外板は、常に水中（淡水、海水を含む）に浸漬している船底部と、水中に浸漬されない外舷部と、これらの中間に位置し、水中への浸漬と空中暴露とが繰り返される水線部とに大別される。
【００４４】
船舶の水線部は、海水中への浸漬と空中暴露の乾湿交互作用を受ける厳しい環境下に曝されるため、耐候性、耐水性、さらに必要に応じて防汚性が必要とされる。したがって、水線部用上塗り塗料としては、ウレタン系、エポキシ系、アクリル系、塩素化ポリオレフィン系（塩化ゴム系）塗料、または非有機錫系防汚塗料が好ましく、特にエポキシ系塗料、非有機錫系防汚塗料が好ましい。具体的には、イソシアネート架橋型２液型ウレタン樹脂系上塗塗料の「ユニマリン（商品名）」（中国塗料（株）製）、変性ポリアミドアミン架橋型２液型エポキシ樹脂系上塗塗料の「エピコンマリン上塗（商品名）」（中国塗料（株）製）、「エピコンマリンＨＢ（商品名）」（中国塗料（株）製）、塩素化ポリオレフィン系上塗塗料の「ラバックス上塗（商品名）」（中国塗料（株）製）、アクリル樹脂系上塗塗料の「アクリ７００上塗（商品名）」（中国塗料（株）製）等が挙げられる。
【００４５】
上記非有機錫系防汚塗料としては、たとえば特開平１０−２１１４６４号公報に記載されている非有機錫系防汚塗料、すなわち(i) トリアルキルシリルエステル共重合体、あるいは、(ii)ビニル系樹脂の少なくとも１つの側鎖末端部に、金属エステル結合たとえば銅エステル結合を介して有機酸が結合した樹脂たとえば不飽和カルボン酸銅塩成分含有共重合体、(iii) （メタ）アクリル酸ヒドロキシ亜鉛共重合体または（メタ）アクリル酸亜鉛共重合体などの重合性不飽和カルボン酸亜鉛塩成分含有共重合体等が含まれたものが挙げられる。
【００４６】
船舶の外舷部は、強い陽射しや風波に曝されるため、耐候性などが必要とされる。したがって、外舷部用上塗り塗料としては、ウレタン系、エポキシ系、アクリル系、塩素化ポリオレフィン系（塩化ゴム系）塗料が好ましく、特にウレタン系塗料が好ましい。具体的には、「ユニマリン（商品名）」（中国塗料（株）製、イソシアネート架橋型２液型ウレタン樹脂系上塗塗料）、「エピコンマリン上塗（商品名）」、「エピコンマリンＨＢ（商品名）」（中国塗料（株）製、変性ポリアミドアミン架橋型２液型エポキシ樹脂系上塗塗料）、「ラバックス上塗（商品名）」（中国塗料（株）製、塩素化ポリオレフィン系上塗塗料）、「アクリ７００上塗（商品名）」（中国塗料（株）製、アクリル樹脂系上塗塗料）等を挙げることができる。
【００４７】
上記の水線部および外舷部用の各塗料には、通常船舶外板塗料に配合されるような成分、たとえば防汚剤、可塑剤、加水分解調整剤、顔料、溶剤、粘度調整剤、その他の添加剤等が含まれていてもよい。
また、船舶タンク（バラストタンク、カーゴタンク）の内表面における上塗り塗装に用いられる塗料は、上述したタッチアップ塗装で用いられる防食塗料であり、さらには、特願平１０−１８２２９１号明細書において開示されているビスフェノール型エポキシ樹脂系防食塗料組成物およびウレタン樹脂系防食塗料組成物などが挙げられる。これらの防食塗料組成物は、水線部および外舷部用上塗り塗料としても用いることができる。
【００４８】
このビスフェノール型エポキシ樹脂系防食塗料組成物は、（ｉ）エポキシ当量が１５０〜１０００のビスフェノール型エポキシ樹脂、（ii）ポリアミドアミン、ポリアミンまたはこれらの変性物からなるエポキシ樹脂用硬化剤、（iii)着色顔料０．３〜５重量％（固形分）、および（iv）光透過性無機充填剤２５〜５０容積％（充填剤容積濃度）を含有している。
【００４９】
また、ウレタン樹脂系防食塗料組成物は、（ｉ）ポリオールおよび／またはポリチオール、（ii）ポリイソシアネート系硬化剤、（iii)着色顔料０．３〜５重量％（固形分）、および（iv）光透過性無機充填剤２５〜５０容積％（充填剤容積濃度）を含有している。
上記のようなビスフェノール型エポキシ樹脂系およびウレタン樹脂系防食塗料組成物を使用する場合、その防食塗料組成物を、所望の乾燥塗膜厚ｔ₀ μｍでの隠蔽率が０．９４以上１未満であり、乾燥塗膜厚ｔ₀ ／２μｍでの隠蔽率が０．７０〜０．９０（ｔ₀ は、１００〜３００）になるように調整し、該防食塗料組成物の前記タンク内表面に塗装された所望の厚さｔ₀ μｍの乾燥塗膜と、タンク内表面との色差（ΔＥ）を１００とするとき、塗装部のウェット状態の塗膜とタンク内表面との色差（ΔＥ）を観察し、該色差（ΔＥ）が９０以上となるように、防食塗料組成物の塗布量を制御して塗装する。この塗装方法によれば、船舶タンクの内表面に形成する防食塗料の塗装膜厚の管理を容易に行なうことができる。
【００５０】
また、陸上鋼構造物における上塗り塗料としては、たとえば油性（アルキッド）系、フタル酸樹脂系、塩素化ポリオレフィン系（塩化ゴム系）、ビニル系、アクリル系、エポキシ系、ウレタン系、シリコーンアルキッド系、アクリルシリコーン系、フッ素樹脂系等の上塗り塗料を挙げることができる。
上記の上塗り塗装は、たとえばエアレススプレー、エアースプレー、刷毛塗り、ローラー塗りなどの常法によればよい。上記各塗料は、シンナー等で適宜濃度に希釈して用いることができる。
【００５１】
船舶または鋼構造物の第２の塗装方法
本発明に係る船舶または鋼構造物の第２の塗装方法では、鋼材を溶接して組み立てた船舶または鋼構造物表面の修繕塗装において、その表面に、水とともに研掃材（Ａ）をブラストするウォーターブラスト処理を行なった後、上塗り塗装する。
【００５２】
この第２の塗装方法におけるウォーターブラスト処理方法、研掃材（Ａ）、腐食抑制剤（Ｂ）および上塗り塗料については、上述した本発明に係る船舶または鋼構造物の第１の塗装方法におけるウォーターブラスト処理方法、研掃材（Ａ）、腐食抑制剤（Ｂ）、上塗り塗料と同様である。
【００５３】
【発明の効果】
本発明に係る船舶または鋼構造物の第１の塗装方法によれば、船舶または鋼構造物を新規に製作する際に、一次表面処理により形成されたプライマー塗膜を損傷させることなく、船舶、鋼構造物の建造中に付着するヒートスケール、スパッター、その他の種々の異物、腐食性物質、プライマー塗膜の劣化部分およびプライマー塗膜の損傷により発生した錆を完全乃至ほぼ完全に容易に除去することが可能で、しかも、粉塵の搬出という後処理を減少あるいは必要とせず、作業環境を改善することができるとともに、上塗り塗料の付着性を阻害させることなく、戻り錆の発生を防止することができる。
【００５４】
また、本発明に係る船舶または鋼構造物の第２の塗装方法によれば、船舶または鋼構造物の表面を修繕塗装する際に、鋼材表面に付着している種々の異物、腐食性物質、錆を完全に乃至ほぼ完全に除去することが容易にでき、しかも、作業環境を改善することができるとともに、上塗り塗料の付着性を阻害させることなく、戻り錆の発生を防止することができる。
【００５５】
本発明は、ウォーターブラスト処理を利用するものであり、従来のサンドブラスト処理あるいはディスクサンダー処理した後に形成された上塗り塗膜の物性と同等の物性を有する上塗り塗膜を形成することができる。
【００５６】
【実施例】
以下に、本発明を実施例により説明するが、本発明は、これらの実施例により何ら限定されるものではない。
【００５７】
【参考例１】
サンドブラスト処理した３００ｍｍ×１５０ｍｍ×３．２ｍｍの鋼板に、無機ジンク系ショッププライマー（商品名 ウェルボンドＨ、中国塗料（株）製）を乾燥膜厚が１５μｍになるように塗装し、１カ月屋外暴露した。このサンドブラスト処理は、研掃材として５号珪砂を用い、エアー圧０．５ＭＰａの条件で行なった。
【００５８】
次いで、この塗装鋼板２枚を突き合わせ溶接した後、直ちに溶接線に無機ジンク系ショッププライマー（商品名 ウェルボンドＨ、中国塗料（株）製）をタッチアップ塗装し、３カ月屋外暴露した。
次いで、この突き合わせ溶接板の表面全体にウォーターブラスト処理を水圧２００ＭＰａの条件で施した後、その表面にタールエポキシ系防食塗料（商品名 ビスコンＨＢ−２００、中国塗料（株）製）を乾燥膜厚が２００μｍとなるように塗装し、２０℃で７日間乾燥させ、防食性試験用試験片を得た。
【００５９】
上記のようにして得られた防食性試験用試験片で、溶接線または発錆部に直角となるような切り傷を鋼板に達するようにカッターナイフで施し、４０℃の３％食塩水中に１８０日間浸漬し、塗膜のフクレの程度をＡＳＴＭＤ７１４−５６、発錆の程度をＡＳＴＭＤ６１０−８５に準じて目視にて下記の評価点数で評価し、付着性を碁盤目テープ法（ＪＩＳＫ５４００、８．５．２に準拠）により下記の評価点数で評価し、さらに切り傷部よりの塗膜下水浸透度を測定した。
【００６０】
これらの結果を第１表に示す。
【００６１】
＜フクレ試験の評価点数＞
１０点：フクレ無し
９点：０．５ｍｍ径のフクレが試験板の全面積の０．２％未満
８点：０．５ｍｍ径のフクレが試験板の全面積の０．５％程度
７点：０．５ｍｍから１ｍｍ径のフクレが試験板の全面積の０．５％程度
６点：１ｍｍから２ｍｍ径のフクレが試験板の全面積の０．５〜１％程度
５点：２ｍｍから３ｍｍ径のフクレが試験板の全面積の１〜５％程度
４点：３ｍｍから５ｍｍ径のフクレが試験板の全面積の５〜１０％程度
３点：３ｍｍから５ｍｍ径のフクレが試験板の全面積の１０〜１５％程度
２点：３ｍｍから５ｍｍ径のフクレが試験板の全面積の１５〜３０％程度
１点：フクレ発錆面積が試験板の全面積の３０％以上
【００６２】
＜発錆試験の評価点数（ＡＳＴＭＤ６１０-８５）＞
１０点：錆無し、あるいは発錆面積が試験板の全面積の０．０３％未満
９点：発錆面積が試験板の全面積の０．０３％以上０．１％未満
８点：発錆面積が試験板の全面積の０．１％以上０．３％未満
７点：発錆面積が試験板の全面積の０．３％以上１％未満
６点：発錆面積が試験板の全面積の１％以上３％未満
５点：発錆面積が試験板の全面積の３％以上１０％未満
４点：発錆面積が試験板の全面積の１０％以上１６％未満
３点：発錆面積が試験板の全面積の１６％以上３３％未満
２点：発錆面積が試験板の全面積の３３％以上５０％未満
１点：発錆面積が試験板の全面積の５０％以上
【００６３】
＜碁盤目試験の評価点数＞
１０点：切り傷１本ごとが、細くて両側が滑らかで、切り傷の交点と正方形の
一目一目に剥がれがない。
９点：切り傷が少し太くなっている。
８点：切り傷の交点にわずかな剥がれがあって、正方形の一目一目に剥がれがなく、欠損部の面積は全正方形面積の５％以内。
７点：切り傷の両側と交点とに剥がれがあり、欠損部の面積は全正方形面積の５％未満。
６点：切り傷の両側と交点とに剥がれがあって、欠損部の面積は全正方形面積の５％以上１５％未満。
５点：切り傷による剥がれの幅は、「６点」よりも広く、欠損部の面積は全正方形面積の１５％以上２５％未満。
４点：切り傷による剥がれの幅が広く、欠損部の面積は全正方形面積の２５％以上３５％未満。
３点：正方形の一目一目に剥がれがあり、その面積は全正方形面積の３５％以内。
２点：切り傷による剥がれは「３点」よりも大きく、欠損部の面積は全正方形面積の３５％以上５０％未満。
１点：切り傷による剥がれは「２点」よりも大きく、その面積は全正方形面積の５０％以上７０％未満。
０点：剥がれの面積は、全正方形面積の７０％以上。
【００６４】
【参考例２】
参考例１において、参考例１のウォーターブラスト処理の代わりに、研掃材（ガーネット粒子９０重量％および亜鉛粒子１０重量％）を添加した水を用いてウォーターブラスト処理を水圧２０ＭＰａの条件で行なった以外は、参考例１と同様にして、防食性試験用試験片を得た。
【００６５】
上記のようにして得られた防食性試験用試験を用い、参考例１と同様にして、塗膜のフクレの程度、発錆の程度、付着性を評価し、さらに切り傷部よりの塗膜下水浸透度を測定した。
【００６６】
これらの結果を第１表に示す。
【００６７】
【参考例３】
サンドブラスト処理した３００ｍｍ×１５０ｍｍ×３．２ｍｍの鋼板に、無機ジンク系ショッププライマー（商品名 ウェルボンドＨ、中国塗料（株）製）を乾燥膜厚が１５μｍになるように塗装し、１カ月屋外暴露した。このサンドブラスト処理は、研掃材として５号珪砂を用い、エアー圧０．５ＭＰａの条件で行なった。
【００６８】
次いで、この塗装鋼板２枚を突き合わせ溶接し、さらに３カ月屋外暴露して溶接部に錆を発生させた。
次いで、この突き合わせ溶接板の表面全体に、ウォーターブラスト処理を水圧２００ＭＰａの条件で施した後、溶接線に機能性防食塗料（商品名 ビスマックス、中国塗料（株）製）をタッチアップ塗装した。
【００６９】
次いで、この突き合わせ溶接板の表面にタールエポキシ系防食塗料（商品名ビスコンＨＢ−２００、中国塗料（株）製）を乾燥膜厚が２００μｍとなるように塗装し、２０℃で７日間乾燥させ、防食性試験用試験片を得た。上記のようにして得られた防食性試験用試験を用い、参考例１と同様にして、塗膜のフクレの程度、発錆の程度、付着性を評価し、さらに切り傷部よりの塗膜下水浸透度を測定した。
【００７０】
これらの結果を第１表に示す。
【００７１】
【比較例１】
サンドブラスト処理した３００ｍｍ×１５０ｍｍ×３．２ｍｍの鋼板に、無機ジンク系ショッププライマー（商品名 ウェルボンドＨ、中国塗料（株）製）を乾燥膜厚が１５μｍになるように塗装し、１カ月屋外暴露した。このサンドブラスト処理は、研掃材として５号珪砂を用い、エアー圧０．５ＭＰａの条件で行なった。
【００７２】
次いで、この塗装鋼板２枚を突き合わせ溶接し、さらに３カ月屋外暴露して溶接部に錆を発生させた。
次いで、この突き合わせ溶接板の表面全体に、サンドブラスト処理を施した後、その表面にタールエポキシ系防食塗料（商品名 ビスコンＨＢ−２００、中国塗料（株）製）を乾燥膜厚が２００μｍとなるように塗装し、２０℃で７日間乾燥させ、防食性試験用試験片を得た。このサンドブラスト処理も、研掃材として５号珪砂を用い、エアー圧０．５ＭＰａの条件で行なった。
【００７３】
上記のようにして得られた防食性試験用試験片を用い、参考例１と同様にして、塗膜のフクレの程度、発錆の程度、付着性を評価し、さらに切り傷部よりの塗膜下水浸透度を測定した。これらの結果を第１表に示す。
【００７４】
【比較例２】
比較例１において、突き合わせ溶接板に施したサンドブラスト処理の代わりにウォーターブラスト処理を水圧２００ＭＰａの条件で行なった以外は、比較例１と同様にして、防食性試験用試験片を得た。上記のようにして得られた防食性試験用試験片を用い、参考例１と同様にして、塗膜のフクレの程度、発錆の程度、付着性を評価し、さらに切り傷部よりの塗膜下水浸透度を測定した。
【００７５】
これらの結果を第１表に示す。
【００７６】
【比較例３】
比較例１において、突き合わせ溶接板に施したサンドブラスト処理を行わなかった以外は、比較例１と同様にして、防食性試験用試験片を得た。上記のようにして得られた防食性試験用試験片を用い、参考例１と同様にして、塗膜のフクレの程度、発錆の程度、付着性を評価し、さらに切り傷部よりの塗膜下水浸透度を測定した。
【００７７】
これらの結果を第１表に示す。
【００７８】
【参考例４】
サンドブラスト処理した３００ｍｍ×１５０ｍｍ×３．２ｍｍの鋼板に、無機ジンク系ショッププライマー（商品名 ウェルボンドＨ、中国塗料（株）製）を乾燥膜厚が１５μｍになるように塗装した後、タールエポキシ系防食塗料（商品名 ビスコンＨＢ−２００、中国塗料（株）製）を乾燥膜厚が２００μｍとなるように塗装した。このサンドブラスト処理は、研掃材として５号珪砂を用い、エアー圧０．５ＭＰａの条件で行なった。
【００７９】
次いで、この塗装鋼板の中央部を３０ｍｍ幅に塗膜を剥がし、３カ月間３％食塩水中に浸漬し、部分的に発錆させた。
次いで、この塗装鋼板の発錆部に、研掃材（ガーネット粒子９０重量％および亜鉛粒子１０重量％）を添加した水を用いてウォーターブラスト処理を水圧２０ＭＰａの条件で行なった後、タールエポキシ系防食塗料（商品名 ビスコンＨＢ−２００、中国塗料（株）製）を乾燥膜厚が２００μｍとなるように塗装し、２０℃で７日間乾燥させ、防食性試験用試験片を得た。
【００８０】
上記のようにして得られた防食性試験用試験片を用い、参考例１と同様にして、塗膜のフクレの程度、発錆の程度、付着性を評価し、さらに切り傷部よりの塗膜下水浸透度を測定した。これらの結果を第１表に示す。
【００８１】
【比較例４】
参考例４において、参考例４のウォーターブラスト処理の代わりにウォーターブラスト処理を水圧２００ＭＰａの条件で行なった以外は、参考例４と同様にして、防食性試験用試験片を得た。上記のようにして得られた防食性試験用試験片を用い、参考例１と同様にして、塗膜のフクレの程度、発錆の程度、付着性を評価し、さらに切り傷部よりの塗膜下水浸透度を測定した。
【００８２】
これらの結果を第１表に示す。
【００８３】
【表１】

【００８４】
（本発明による塗膜性能向上および塗装環境改善）
新造船として建造した２５８，０００トンのタンカーの外板部、甲板部、バラストタンク部を下記に示す本発明の塗装方法で施工した場合において、以下の項目における向上度を、下記に示す従来の塗装方法−１（サンド、グリットブラスト処理）、塗装方法−２（パワーツール処理（ワイヤーブラシ、ディスクサンダーによる処理））と比較した。
【００８５】
本発明の塗装方法；
主として溶接線の錆発生部を、ＩＳＯ Ｓａ２．５のグレードに達するまでウォーターブラスト処理し、錆発生部以外の一般部は、埃、ゴミ、その他の塵埃をウォータースウィープブラスト処理にて除去した。このウォーターブラスト処理は、研掃材としてガーネット粒子９０重量％と亜鉛末１０重量％との混合物を、水に対して５容積％の割合で行なった。また、ウォータースウィープブラスト処理は、研掃材を用いずに水のみで行なった。
【００８６】
これらの処理を終えた後、処理表面にタールエポキシ系防食塗料を塗装した。
従来の塗装方法−１；
主として溶接線の錆発生部を、研掃材として銅カラミを使用してＩＳＯ Ｓａ２．５のグレードに達するまでドライブラスト処理し、錆発生部以外の一般部は、埃、ゴミ、その他の塵埃をスウィープブラスト処理にて除去した。これらの処理を終えた後、処理表面にタールエポキシ系防食塗料を塗装した。
【００８７】
従来の塗装方法−２；
主として溶接線の錆発生部をディスクサンダーにより、ＩＳＯ Ｓｔ−３のグレードに達するまで処理し、錆発生部以外の一般部は、埃、ゴミ、その他の塵埃を簡単なディスクサンダー処理にて除去した。これらの処理を終えた後、処理表面にタールエポキシ系防食塗料を塗装した。
【００８８】
なお、向上（改善）度の数値は、本発明の塗装方法を１００として、従来の塗装方法−１および塗装方法−２から算出した。
１．塗膜性能向上
（１）無機亜鉛系ショッププライマーの残存性
各種表面処理による無機亜鉛系ショッププライマーの残存量から算出した（下記の算出式より求めた数値が小さい程、残存性がよくないことを示す）。
【００８９】
算出式；
（表面処理後のショッププライマーの付着量）÷（表面処理前のショッププライマーの付着量)×１００
（２）小さなピットないし孔中の腐食性物質の除去効率性
各種表面処理後のピットないし孔中の腐食性物質の残存量から算出した（下記の算出式より求めた数値が小さい程、除去効率がよくないことを示す）。
【００９０】
算出式；
（表面処理後の一定面積当りのピット及び孔中の腐食性物質除去量）÷（表面処理前の一定面積当りのピット及び孔中の腐食性物質量)×１００
（３）均一な表面処理性
処理表面の錆・塵埃・腐食性物質等の除去グレードから算出した（下記の算出式より求めた数値が小さい程、均一表面処理性がよくないことを示す）。
【００９１】
算出式；
（表面処理後の一定面積当りの錆・塵埃・腐食性物質の除去面積）÷（表面処理前の一定面積当りの錆・塵埃・腐食性物質の専有面積）×１００
（４）表面処理後のターニング性
表面処理後のターニングの程度から算出した（下記の算出式より求めた数値が小さい程、ターニング性がよくないことを示す）。
【００９２】
算出式；
（表面処理後のターニングの発生していない面積）÷（表面処理前のターニングの発生していない面積）×１００
（５）上塗り塗料の付着性
上塗り塗料の付着性を調査することにより算出した（下記の算出式より求めた数値が小さい程、付着性がよくないことを示す）。すなわち経時後の付着性を、前述の碁盤目試験の評価点数にて評価した。
２．塗装作業環境改善
（１）粉塵の飛散性
作業場所周囲の飛散粉塵量を計測することにより算出した（下記の算出式より求めた数値が小さい程、粉塵の飛散が大きいことを示す）。
【００９３】
算出式；
（本発明の塗装方法における飛散粉塵量）÷（従来の塗装方法−１または２における飛散粉塵量）×１００
（２）粉塵の後処理性
表面処理作業終了後の飛散粉塵の単位時間当りの処理面積により算出した（下記の算出式より求めた数値が小さい程、後処理が大きいことを示す）。
【００９４】
算出式；
（従来の方法における粉塵処理面積）÷（本発明における粉塵処理面積）×１００
（３）表面処理作業と清掃作業の同時迅速施工性
表面処理作業と清掃作業のラップ作業時間から算出した（下記の算出式より求めた数値が小さい程、ラップ作業時間が小さいことを示す）。
【００９５】
算出式；
（従来の方法によるラップ時間）÷（本発明によるラップ時間）×１００
（４）処理作業の容易性
防塵対策、防水対策、高圧射出対策等の各種の防護対策から算出した（下記の算出式により求めた数値が小さい程、作業性が悪いことを示す）。
【００９６】
算出式；
（本発明の各種対策工数）÷（従来の各種対策工数）×１００
（５）処理の効率性
各々の単位時間当りの処理面積から算出した（下記の算出式より求めた数値が小さい程、効率性が悪いことを示す）。
【００９７】
算出式；
(従来の方法による一定時間当りの処理面積）÷（本発明による一定時間当りの処理面積)×１００
（６）処理の経済性
装置の維持費、償却費、人件費等から算出した（下記の算出式より求めた数値が小さい程、経済性が劣ることを示す）。
【００９８】
算出式；
(本発明による単位面積当たりの各種費用)÷(従来の方法による単位面積当た りの各種費用)×１００
上記の算出結果を第２表に示す。
【００９９】
【表２】

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for painting a ship or a steel structure.
[0002]
TECHNICAL BACKGROUND OF THE INVENTION
Conventionally, in surface treatment of steel structures such as ships or steel structures (except ships) such as towers and bridges by water blasting, the rust prevention treatment and cleaning of the steel surface is performed, and then rusting is again performed in the moisture drying process. If so-called “return rust (turning)” occurs, and normal coating is performed on the return rust, there is a concern that this return rust adversely affects the adhesion of the coating film.
[0003]
Therefore, many techniques for preventing the occurrence of “return rust” by previously adding a rust inhibitor into the water used for water blasting have been proposed.
However, many of the rust inhibitors used in these technologies are alkaline, and when an alkaline rust inhibitor is used, “return rust” does not occur, but those that inhibit the adhesion of the top coat. Many.
[0004]
By the way, for example, steel materials carried into shipyards are subjected to in-house processing and assembly after undergoing a primary surface treatment that combines shot blasting and coating with a primer that is an inorganic zinc-based paint. . After assembling such a steel material, a secondary surface treatment is conventionally applied to the rusted portion of the steel material by a combination of sandblasting or sandering and coating with the same primer as described above.
[0005]
Recently, the performance of the primer in the primary surface treatment has been improved and the rust-free method has been devised to minimize the rusting of the primer damage part. There is little scouring of the parts, and it is mainly used to remove oils and fats, fume, chalk marks, soluble salts (chlorides, sulfides, etc.), dust, etc. that adhere during ship construction.
[0006]
However, the coating on the inner surface of a ship, for example, a water ballast tank, is involved in the safety of the ship, and it is difficult to carry out a repair coating after service, so that the service life is expected to be extended. Therefore, it is necessary to sufficiently perform substrate preparation as a secondary surface treatment, which is a pretreatment, and paint with an appropriate paint when building a new ship. In addition, the defects of the coating film that occur after service are actually generated at the welded seam and sharp edge where it is difficult to adjust the substrate and properly apply.
[0007]
Conventionally, the substrate adjustment is performed by a combination of sandblasting and sanding. However, in these treatments, it is actually difficult to remove corrosive substances existing in small pits or holes and to perform uniform surface treatment. In addition, the work inside the water ballast tank is not only restricted due to its structure, but also requires a harsh labor due to the large area to be painted, and dust scatters in sandblasting and sanding. As a result, the working environment is poor, and post-processing of carrying out dust is necessary.
[0008]
Therefore, when a ship or steel structure is newly produced, heat scale, spatter, and other various materials that adhere during construction of the ship and steel structure without damaging the primer coating formed by the primary surface treatment. It is possible to completely or almost completely remove rust caused by foreign matter, corrosive substances, deteriorated parts of the primer coating, and damage to the primer coating, and reduce or require post-processing of carrying out dust. The method of painting a ship or steel structure, which can improve the working environment, can prevent the occurrence of return rust without impairing the adhesion of the top coating, and the ship or steel structure. When repairing the surface, it is easy to completely or almost completely remove various foreign substances, corrosive substances, and rust adhering to the steel surface. Moreover, it is possible to improve the working environment without the need for post-processing of dust removal, and to prevent the occurrence of return rust without impairing the adhesion of the top coating. The appearance of a painting method is desired.
[0009]
OBJECT OF THE INVENTION
The present invention is intended to solve the problems associated with the prior art as described above, and damages the primer coating formed by the primary surface treatment when a ship or steel structure is newly manufactured. And completely or almost completely eliminate rust caused by heat scale, spatter, various other foreign matters, corrosive substances, deteriorated parts of the primer coating and damage to the primer coating during the construction of ships and steel structures. It can be easily removed, and the work environment can be improved without reducing or necessitating post-processing of dust removal, and the occurrence of return rust can be achieved without impairing the adhesion of the top coat. A ship or steel structure coating method that can be prevented, and various foreign substances adhering to the steel surface when the surface of the ship or steel structure is repaired and painted, It is easy to completely or almost completely remove edible substances and rust, can improve the working environment, and can prevent the occurrence of return rust without impairing the adhesion of the top coat. The object is to provide a method for painting a ship or steel structure.
[0010]
Summary of the Invention
  The first painting method for a ship or steel structure according to the present invention is as follows:
  Ships or steel structures assembled by welding steel materials with zinc-based shop primer on the surfaceRust generation part is treated with water blasting, and general parts other than rust generation part are treated with water sweep blastingApply the top coat after applyingA method of painting a ship or steel structure,
  During the water blast treatment, the abrasive (A) is blasted with water,
  Blast with water only during the water sweep blasting processIt is characterized by that.
[0011]
  In this water blasting treatment, a zinc-based anticorrosive paint is touch-up coated on the damaged part of the coating of the zinc-based shop primer of a ship or steel structure assembled by welding a steel material with a zinc-based shop primer on the surface. After the ship or steel structureRust generation partPreferably applied toThe
  In the water sweep blasting process, zinc-based anticorrosive paint is touch-up coated on the damaged part of the zinc-based shop primer coating on ships or steel structures assembled by welding steel materials with zinc-based shop primer on the surface. After that, it is preferable to apply to general parts other than rust generating parts of ships or steel structures.Yes.
  Also, for ships or steel structures assembled by welding steel materials with zinc-based shop primer on the surface.Rust generation part is treated with water blasting, and general parts other than rust generation part are treated with water sweep blastingAfter applying
  It is also preferable to apply a top coat paint after touch-up coating an anticorrosive paint having affinity with the base material and the top coat paint on the coating film damaged portion, weld seam portion and sharp edge portion of the zinc-based shop primer.
[0012]
In the first coating method for a ship or steel structure according to the present invention, it is preferable to blast the abrasive (A) together with water during the water blast treatment.
As the scouring material (A), a scouring material composed of metal particles (a1) that is baser than iron is preferable, and in particular, metal particles (a1) that are baser than iron and inorganic fine particles (a2) other than metal. Abrasive material consisting of a mixture is preferred.
[0013]
  Moreover, the water containing a corrosion inhibitor (B) can be used in the case of the said water blast process. The water containing the corrosion inhibitor (B) is preferably blasted together with the abrasive (A). The water pressure in the water blast treatment is preferably about 0.1 to 300 MPa.
  Water-only waterSweepThe pressure of blasting is usually 10 to 300 MPa, preferably 150 to 250 MPa, and the pressure of water blasting using the abrasive (A) is usually 0.1 to 300 MPa, preferably 0.3 to 200 MPa. is there.
[0014]
  The second coating method of a ship or steel structure according to the present invention is the surface of a ship or steel structure surface repaired and painted by welding steel materials.Rust generation partWater blasting to blast the abrasive (A) with waterWater sweep blasting that blasts the general part of the surface other than the rust generating part only with waterIt is characterized by top-coating after applying.
  As the scouring material (A), a scouring material composed of metal particles (a1) that is baser than iron is preferable, and in particular, metal particles (a1) that are baser than iron and inorganic fine particles (a2) other than metal. Abrasive material consisting of a mixture is preferred.
[0015]
  Moreover, the water containing a corrosion inhibitor (B) can be used in the case of the said water blast process. The water containing the corrosion inhibitor (B) is preferably blasted together with the abrasive (A).
  The water pressure in the water blast treatment is preferably about 0.1 to 300 MPa. Water-only waterSweepThe pressure of blasting is usually 10 to 300 MPa, preferably 150 to 250 MPa, and the pressure of water blasting using the abrasive (A) is usually 0.1 to 300 MPa, preferably 0.3 to 200 MPa. is there.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the 1st and 2nd coating method of the ship or steel structure which concerns on this invention is demonstrated concretely.
First painting method for ships or steel structures
The first method for painting a ship or steel structure according to the present invention is a coating method applied when a ship or steel structure is newly produced, and is made by welding a steel material having a zinc-based shop primer applied to the surface. In this method, the entire surface of the assembled ship or steel structure is subjected to a water blast treatment and then overcoated.
[0017]
In this coating method, the water blast treatment is performed by touching up the zinc-based anticorrosive paint on the damaged part of the zinc-based shop primer on the surface of the ship or steel structure, It is preferable to carry out over the entire surface. In addition, after water blasting is applied to the entire surface of a ship or steel structure assembled by welding steel materials with a zinc-based shop primer on the surface, the coating-film damaged portion, weld seam portion and It is also preferable to apply a top coating material after touch-up coating, for example, an anticorrosion coating material having affinity with the substrate and the top coating material on the sharp edge portion. The coating film damage of the above zinc-based shop primer is mostly caused by welding or fusing.
[0018]
[Zinc shop primer]
The zinc-based shop primer (zinc-based primary rust-preventive paint) used for applying to the surface of steel in the present invention may be an organic zinc-based primary rust-preventive paint, or an inorganic zinc-based primary rust-preventive paint. Also good. Examples of organic zinc-based primary rust preventive paints include epoxy-based zinc primer, and inorganic zinc primary rust-preventive paints include inorganic binders such as silicate-based binders, especially inorganic zinc using silicate-based binders. It is preferable to use a primary anticorrosive paint. In particular, when an organic zinc-based primary rust preventive paint is used, a coating film having a uniform film thickness and excellent corrosion resistance can be obtained, and the amount of paint to be applied to the surface of the primary rust preventive paint film can be reduced. . In addition, when an inorganic zinc-based primary rust preventive paint is used, a coating film having excellent weldability, a uniform film thickness and excellent corrosion resistance can be obtained. Among these zinc-based shop primers, inorganic zinc-based primary rust preventive paints are particularly preferable.
[0019]
As an epoxy-type zinc primer, it is preferable that a capacity | capacitance non-volatile content is 25 to 35%, and the zinc weight density | concentration in a coating film is 50 to 90%. In addition, the inorganic zinc-based primary rust preventive paint contains a silicate binder and zinc dust as a rust preventive pigment, has a capacity non-volatile content of 17 to 27%, and a zinc weight concentration in the coating film of 20 to 20%. It is preferably 95%.
[0020]
In the present invention, when a rust preventive paint other than a zinc-based shop primer is used as a shop primer, return rust is likely to occur. However, the zinc-based shop primer as described above, particularly an inorganic zinc-based primary prevention containing a silicate binder. If a primer film made of a rust paint is formed on the surface of a steel material, even if the primer film is damaged, it is difficult for rust to return due to the anticorrosive effect of zinc.
[0021]
There is no restriction | limiting in particular in the coating method of the above zinc type shop primers, A conventionally well-known coating method is employable. The zinc-based shop primer is usually applied after the steel surface is shot blasted to remove the scale.
[Ships and steel structures]
Specific examples of ships in the present invention include passenger ships, cargo ships, tankers and the like, and steel structures other than ships include towers, bridges, offshore structures, oil drilling plants, various types of concrete. Examples include large plant structures.
[0022]
[Zinc-based anti-rust paint for touch-up painting]
Examples of the zinc-based anticorrosive paint used in touch-up coating performed as necessary before the water blast treatment include the same organic or inorganic zinc-based primary anticorrosive paint as that of the above-described zinc-based shop primer. In particular, a primary rust preventive paint using a silicate binder is preferable.
[0023]
The touch-up painting as described above can be performed by employing a conventionally known touch-up painting method. In this specification, so-called stripe coating is also included in touch-up coating as long as coating is performed on rust generated in steel.
In the present invention, by applying the touch-up coating on the rust generated in the steel material with the zinc-based anticorrosive paint, the range of rust is prevented from expanding further due to the electrochemical anticorrosive effect of zinc in the paint. And can be easily cleaned up.
[0024]
[Water blasting]
During the water blast treatment, water is blasted, and it is preferable to blast the abrasive (A) together with water. As such a scouring material (A), metal particles lower than iron (a1), inorganic fine particles other than metal (a2), metal particles lower than iron (a1) and inorganic fine particles other than metal (a2) And a mixture thereof.
[0025]
The metal particles (a1) that are lower than iron mean metal particles that have a higher ionization tendency than iron, and examples thereof include particles such as zinc and aluminum. Among these, zinc particles are preferably used. These metal particles (a1) can be used alone or in combination of two or more. The average particle diameter of the metal particles (a1) which are lower than iron is usually 0.1 to 3000 μm, preferably 1 to 300 μm. When metal particles (a1) that are lower than iron, such as zinc particles, are used as the abrasive (A), the metal particles (a1) adhere to the surface of the steel material that has been subjected to water blast treatment, and return rust due to the electrical corrosion protection effect. Generation of (turning) can be prevented. When a zinc-based shop primer, particularly a zinc-based shop primer containing a silicate binder, is used as the shop primer, the effect of preventing the occurrence of return rust is enhanced.
[0026]
Examples of inorganic fine particles (a2) other than metal include fine particles such as garnet and silica sand. These inorganic fine particles (a2) can be used singly or in combination of two or more. The average particle size of such inorganic fine particles (a2) is usually 50 to 3000 μm, preferably 300 to 1000 μm. The heat scale that adheres to the welding location and the weld line and the scale that is generated by the consumption of the spatter and shop primer cannot be completely removed by blasting using only water, but the abrasive ( When A) is used in combination with inorganic fine particles (a2) other than metals such as garnet and silica sand, heat scale, spatter, and scale can be easily removed completely or almost completely. When the metal particles (a1) which are lower than iron such as zinc particles are used in combination, the return rust can be prevented chemically or electrochemically.
[0027]
When only the metal particles (a1) that are lower than iron are used as the polishing material (A), the metal particles (a1) that are lower than iron are usually 1 to 1000% by volume, preferably 10 to 10% by volume. Used at a rate of 30% by volume.
When only inorganic fine particles (a2) other than metal are used as the polishing material (A), the fine particles (a2) other than metal are usually 1 to 1000% by volume, preferably 10 to 30% by volume, based on water. Used in
[0028]
When using a mixture of metal particles (a1) based from iron and inorganic fine particles (a2) other than metal as the abrasive (A), the metal particles base (a1) from iron are Usually used in a ratio of 1 to 1000% by volume, preferably 10 to 30% by volume, and the inorganic fine particles (a2) other than metal are usually 1 to 1000% by volume, preferably 10 to 30% by volume, based on water. Used in proportions.
[0029]
It is desirable to add the corrosion inhibitor (B) to water during the water blast treatment. This corrosion inhibitor (B) is a chemical that forms a protective film on the metal surface and prevents it from being attacked by a corrosive substance, and a conventionally known corrosion inhibitor can be used. In particular,
Sodium chromate (Na₂CrO_Four), Sodium dichromate (Na₂Cr₂O₇・ 2H₂Chromate such as O), sodium nitrite (NaNO)₂Anode type (anode type) inhibitors such as nitrites, molybdates, tungstates, benzoates, etc .;
Cathode type (cathode type) inhibitors such as polymerized phosphates, phosphonic acids, zinc salts;
Examples thereof include bipolar inhibitors such as amines and surfactants having a polar group and a hydrophobic group having an affinity for metal in the same molecule. These corrosion inhibitors (B) can be used alone or in combination of two or more. Examples of such a combination include a combination of chromate and polymerized phosphate and a combination of polymerized phosphate and zinc salt.
[0030]
The concentration and pH of the corrosion inhibitor (B) added to water cannot be uniquely identified and are appropriately determined depending on the type. For example, sodium chromate is used with an addition concentration of usually 300 to 500 ppm and an alkalinity of pH 8.5 or less. Further, sodium nitrite has an addition concentration of usually about 50 ppm, and is preferably used with an alkaline pH of 9-10.
[0031]
In the case of water blasting of steel, there is concern about the occurrence of return rust, but in the case of ultra-high pressure water blasting, the temperature of the steel that was hit by spraying water, etc. rises, and the drying speed is Return rust hardly occurs due to the fact that it is faster than the case and the effect of the anticorrosion of the zinc-based shop primer used for the primary surface treatment. Therefore, in the present invention, the water blast treatment is preferably performed at a water pressure of about 0.1 to 300 MPa. The pressure of water blast treatment with water alone is usually 10 to 300 MPa, preferably 150 to 250 MPa, and the pressure of water blast treatment with the abrasive (A) is usually 0.1 to 300 MPa, preferably 0.00. 3 to 200 MPa. The amount of water is preferably 5 to 50 liters / minute.
[0032]
The water blast treatment can be performed using a conventionally known water jet gun. Furthermore, if the gun has such a structure that when the water or the water containing the corrosion inhibitor (B) is sprayed from the nozzle of the gun, the granular abrasive (A) can be sprayed together with the water. Any cancer can be used. Further, when the use ratio of the abrasive (A) is large, a high-pressure air jet gun using high-pressure air is also advantageously used.
[0033]
By performing rust prevention treatment with the zinc-based shop primer as described above, water blast treatment, and touch-up coating as required, excellent long-term corrosion resistance can be imparted to ships and steel structures.
[Touch-up painting after water blasting]
Non-tar epoxy resin paints, tar epoxy resin paints, urethane resin paints are used as anticorrosion paints used for touch-up coating on damaged parts, weld seams and sharp edges of zinc shop primer after water blasting. Etc. can be illustrated. Among these anticorrosion paints, tar-based epoxy resin paints having a high affinity with the base and top coat are particularly preferable. Examples of such tar type epoxy resin paints include anticorrosion paint compositions disclosed in Japanese Patent Publication No. Sho 62-36073, Japanese Patent Publication No. Sho 62-47907, and Japanese Patent Publication No. Hei 3-49949. .
[0034]
The anticorrosion coating composition disclosed in Japanese Patent Publication No. 62-36073 is
(I) High molecular weight obtained by reacting an epoxy resin represented by the following general formula (1) with a polyhydric phenol carboxylic acid polyhydric alcohol ester having an adjacent hydroxyl group or a polynuclear polyhydric phenol having an adjacent hydroxyl group in a solvent. A reaction product (modified epoxy resin);
(Ii) a bituminous substance;
(Iii) a polyisocyanate compound having more than one isocyanate group in one molecule;
It is an anticorrosion coating composition using a color developing agent.
[0035]
[Chemical 1]

[0036]
[Wherein R¹Is H or CH_ThreeAnd
R²Is -CH₂-Or -C (CH_Three)₂−
n is 30-200. ]
The polyhydric phenol carboxylic acid polyhydric alcohol ester having an adjacent hydroxyl group includes polyhydric alcohols such as ethylene glycol, propylene glycol, pentaerythritol, catechol-3-carboxylic acid, gallic acid, pyrogallol-4,6-dicarboxylic acid. It is an ester compound with polyhydric phenol carboxylic acid.
[0037]
Examples of the bituminous substance include so-called swollen charcoal obtained by swelling coal powder with a mixture of coal tar and coal tar pitch at a high temperature of 300 ° C. or higher.
The anticorrosion coating composition disclosed in Japanese Patent Publication No. 62-47907
(I) An epoxy resin represented by the same formula except that n is 5 to 30 in the above general formula, a polyhydric phenol carboxylic acid having an adjacent hydroxyl group, a polyhydric phenol polyhydric alcohol ester having an adjacent hydroxyl group, or an adjacent hydroxyl group A high molecular weight reaction product (modified epoxy resin) obtained by reacting a polynuclear polyhydric phenol with a solvent in a solvent;
(Ii) a bituminous substance;
(Iii) with zinc chromate
Is an anticorrosive coating composition containing as an essential component.
[0038]
Examples of the polyhydric phenol carboxylic acid having an adjacent hydroxyl group include catechol-3-carboxylic acid, gallic acid, pyrogallol-4,6-dicarboxylic acid and the like.
Examples of the polynuclear polyhydric phenol having an adjacent hydroxyl group include catechol, pyrogallol, and tannic acid.
[0039]
The anticorrosion paint disclosed in Japanese Patent Publication No. 3-49949
(I) Solvent containing epoxy resin represented by the same formula except that n is 5 to 30 in the above general formula, and polyhydric phenol carboxylic acid polyhydric alcohol ester having adjacent hydroxyl group or polynuclear polyhydric phenol having adjacent hydroxyl group 100 parts by weight of a high molecular weight reaction product (modified epoxy resin) obtained by reacting in
(Ii) 30 to 600 parts by weight of a coal-based bituminous material;
(Iii) An anticorrosive coating composition comprising 0 to 50 parts by weight of a liquid synthetic rubber having a weight average molecular weight of 200 to 50,000.
[0040]
Examples of the liquid synthetic rubber include a single compound or a copolymer of a compound having at least one conjugated double bond selected from butadiene, chloroprene and neoprene.
The color tone of these anticorrosion coating compositions is preferably light. This is because, when touch-up coating is performed with a light-colored anticorrosion coating composition, visual detection of pits (corrosion holes), undercuts, cracks, and the like on the steel sheet surface is facilitated.
[0041]
These anticorrosion paint compositions are suitable as heavy anticorrosion paints to be applied to the inner surface of ships, particularly tanks, and can be used as anticorrosion paints for oil storage tanks, various land plants, inner surfaces of bridge girders, and other steel structures. .
When the touch-up coating is performed on the rust generated on the surface of the steel material with the anticorrosion paint as described above, the expansion of the rust range can be prevented. Such touch-up coating is suitable for inner coating of ship outer plates and ship tanks, particularly ballast tanks such as water ballast tanks.
[0042]
This touch-up painting can be performed by a conventionally known touch-up painting method.
As anticorrosion paints used in touch-up painting, for example, “Bismax” (modified tar epoxy resin paint), “Yumeguard PU” (modified epoxy urethane resin paint), “Yumeguard PU-TU” (epoxy) from China Paint Co., Ltd. Polyurethane resin paint), “Super Bondex T” (modified epoxy resin paint), “Yumeguard SX” (modified epoxy resin), and commercially available anticorrosive paints.
[0043]
[Top coating]
The top coating used in the top coating after the water blast treatment or after the touch-up coating with the anticorrosion coating is a coating other than the zinc-based shop primer.
In the case of a ship, the outer plate is located between the bottom of the ship that is always immersed in water (including freshwater and seawater) and the outer shell that is not immersed in water, and is immersed in water and exposed to the air. It is roughly divided into a water line part where the process is repeated.
[0044]
Since the waterline part of a ship is exposed to the severe environment which receives the wet and dry interaction of immersion in seawater and exposure in the air, weather resistance, water resistance, and antifouling property are required as needed. Therefore, as the top coat for water line parts, urethane-based, epoxy-based, acrylic-based, chlorinated polyolefin-based (chlorinated rubber-based) paints, or non-organic tin antifouling paints are preferable, especially epoxy-based paints and non-organic tins An antifouling paint is preferred. Specifically, “Unimarine (trade name)” (made by China Paint Co., Ltd.), an isocyanate-crosslinked two-component urethane resin-based topcoat, and “Epicon Marine”, a modified polyamidoamine-crosslinked two-component epoxy resin-based topcoat. "Topcoat (trade name)" (manufactured by China Paint Co., Ltd.), "Epicon Marine HB (trade name)" (manufactured by China Paint Co., Ltd.), "Rabax topcoat (trade name)" of chlorinated polyolefin-based topcoat (China) Paint Co., Ltd.), “Acry 700 Top Coat (trade name)” (manufactured by China Paint Co., Ltd.) and the like, which are acrylic resin-based top coats.
[0045]
Examples of the non-organic tin-based antifouling paint include non-organic tin-based antifouling paints described in JP-A-10-212464, that is, (i) a trialkylsilyl ester copolymer, or (ii) vinyl. A resin containing, for example, an unsaturated carboxylic acid copper salt component, a resin in which an organic acid is bonded to at least one side chain end of the resin via a metal ester bond such as a copper ester bond; Examples include those containing a polymerizable unsaturated carboxylic acid zinc salt component-containing copolymer such as a zinc copolymer or a zinc (meth) acrylate copolymer.
[0046]
Since the outer gutter of a ship is exposed to strong sunlight and wind waves, weather resistance is required. Accordingly, as the top coat for the outer collar portion, urethane-based, epoxy-based, acrylic-based, and chlorinated polyolefin-based (chlorinated rubber-based) coatings are preferable, and urethane-based coatings are particularly preferable. Specifically, “Unimarine (trade name)” (manufactured by China Paint Co., Ltd., isocyanate cross-linked two-component urethane resin-based topcoat), “Epicon Marine topcoat (trade name)”, “Epicon Marine HB (trade name) ) "(Manufactured by China Paint Co., Ltd., modified polyamidoamine cross-linked two-component epoxy resin-based top coat)," Rabax top coat (trade name) "(manufactured by China Paint Co., Ltd., chlorinated polyolefin-based top coat), Acry 700 Topcoat (trade name) "(manufactured by China Paint Co., Ltd., acrylic resin-based topcoat).
[0047]
Each of the paints for the waterline part and the outer part of the paint is a component that is usually blended in a ship outer plate paint, such as an antifouling agent, a plasticizer, a hydrolysis adjusting agent, a pigment, a solvent, a viscosity adjusting agent, Other additives and the like may be included.
The paint used for the top coating on the inner surface of a ship tank (ballast tank, cargo tank) is an anticorrosion paint used in the touch-up coating described above, and further disclosed in Japanese Patent Application No. 10-182291. Examples thereof include bisphenol-type epoxy resin-based anticorrosion coating compositions and urethane resin-based anticorrosion coating compositions. These anticorrosion paint compositions can also be used as top coats for waterline parts and outer parts.
[0048]
This bisphenol-type epoxy resin-based anticorrosive coating composition comprises (i) a bisphenol-type epoxy resin having an epoxy equivalent of 150 to 1000, (ii) a curing agent for epoxy resin comprising polyamidoamine, polyamine or a modified product thereof, (iii) It contains 0.3 to 5% by weight (solid content) of a color pigment, and (iv) 25 to 50% by volume (filler volume concentration) of a light-transmitting inorganic filler.
[0049]
The urethane resin-based anticorrosive coating composition comprises (i) a polyol and / or polythiol, (ii) a polyisocyanate-based curing agent, (iii) 0.3 to 5% by weight (solid content) of a color pigment, and (iv) It contains 25 to 50% by volume of light-transmitting inorganic filler (filler volume concentration).
When using the bisphenol-type epoxy resin-based and urethane resin-based anticorrosive coating composition as described above, the anticorrosive coating composition has a desired dry coating thickness t.₀The concealment rate in μm is 0.94 or more and less than 1, and the dry coating thickness t₀The concealment rate at / 2 μm is 0.70 to 0.90 (t₀The desired thickness t of the anticorrosive coating composition coated on the inner surface of the tank.₀When the color difference (ΔE) between the dry coating film of μm and the tank inner surface is 100, the color difference (ΔE) between the wet coating film and the tank inner surface of the coated part is observed, and the color difference (ΔE) is The coating is carried out while controlling the coating amount of the anticorrosion coating composition so that it becomes 90 or more. According to this coating method, it is possible to easily manage the coating film thickness of the anticorrosive paint formed on the inner surface of the ship tank.
[0050]
In addition, as top coating for land steel structures, for example, oil-based (alkyd), phthalic acid resin-based, chlorinated polyolefin-based (chlorinated rubber-based), vinyl-based, acrylic-based, epoxy-based, urethane-based, silicone-alkyd-based, A top coat such as an acrylic silicone type or a fluororesin type may be used.
The top coating may be performed by a conventional method such as airless spraying, air spraying, brush coating, or roller coating. Each of the above-mentioned paints can be used by diluting to an appropriate concentration with thinner or the like.
[0051]
Second coating method for ships or steel structures
In the second painting method for a ship or steel structure according to the present invention, in the repair painting of the surface of the ship or steel structure assembled by welding steel materials, the surface is blasted with the abrasive (A) together with water. After water blasting, top coat.
[0052]
Regarding the water blasting method, the abrasive (A), the corrosion inhibitor (B), and the top coating in the second coating method, the water in the first coating method for a ship or steel structure according to the present invention described above is used. It is the same as the blasting method, the abrasive (A), the corrosion inhibitor (B), and the top coat.
[0053]
【The invention's effect】
According to the first method for painting a ship or steel structure according to the present invention, when a ship or steel structure is newly produced, the ship, without damaging the primer coating formed by the primary surface treatment, Easily removes heat scale, spatter, various other foreign substances, corrosive substances, deteriorated primer coating and rust caused by primer coating damage during construction of steel structures completely or almost completely. It is possible to improve the working environment without reducing or necessitating post-processing of dust removal, and to prevent the occurrence of return rust without impairing the adhesion of the top coat. it can.
[0054]
Moreover, according to the 2nd coating method of the ship or steel structure which concerns on this invention, when carrying out repair coating of the surface of a ship or steel structure, the various foreign material adhering to the steel material surface, a corrosive substance, Rust can be removed completely or almost completely, and the working environment can be improved, and the occurrence of return rust can be prevented without impairing the adhesion of the top coat.
[0055]
The present invention utilizes a water blast treatment, and can form a top coat film having physical properties equivalent to those of a top coat film formed after a conventional sand blast treatment or a disk sander treatment.
[0056]
【Example】
EXAMPLES The present invention will be described below with reference to examples, but the present invention is not limited to these examples.
[0057]
[referenceExample 1]
  An inorganic zinc-based shop primer (trade name Wellbond H, manufactured by China Paint Co., Ltd.) is applied to a 300mm x 150mm x 3.2mm steel plate that has been sandblasted and exposed to the outside for one month. did. This sandblasting treatment was performed under the condition of air pressure of 0.5 MPa using No. 5 silica sand as a polishing material.
[0058]
Next, two coated steel sheets were butt-welded, and immediately, an inorganic zinc shop primer (trade name Wellbond H, manufactured by China Paint Co., Ltd.) was touch-up coated on the weld line and exposed outdoors for 3 months.
Next, the entire surface of the butt weld plate is subjected to a water blast treatment under the condition of a water pressure of 200 MPa, and then a tar epoxy anticorrosive paint (trade name: Viscon HB-200, manufactured by China Paint Co., Ltd.) is dried on the surface. Was coated to 200 μm and dried at 20 ° C. for 7 days to obtain a test piece for anticorrosion test.
[0059]
The test piece for anticorrosion test obtained as described above was cut with a cutter knife so as to reach the steel plate at a right angle to the weld line or the rusted portion, and 180 days in 3% saline at 40 ° C. The film was immersed, the degree of swelling of the coating film was visually evaluated according to ASTM D 714-56, the degree of rusting was visually evaluated according to ASTM D 610-85, and the adhesion was determined by the cross-cut tape method (JISK5400, 8.5. 2), and the coating film sewage penetration from the cut portion was measured.
[0060]
These results are shown in Table 1.
[0061]
<Evaluation score of blister test>
10 points: No swelling
9 points: 0.5 mm diameter swelling is less than 0.2% of the total area of the test plate
8 points: 0.5 mm diameter swelling is about 0.5% of the total area of the test plate
7 points: 0.5 mm to 1 mm diameter swelling is about 0.5% of the total area of the test plate
6 points: 1 mm to 2 mm diameter swelling is about 0.5 to 1% of the total area of the test plate
5 points: 2 mm to 3 mm diameter swelling is about 1 to 5% of the total area of the test plate
4 points: 3 to 5 mm diameter swelling is about 5 to 10% of the total area of the test plate
3 points: 3 to 5 mm diameter swelling is about 10 to 15% of the total area of the test plate
2 points: 3 to 5 mm diameter swelling is about 15-30% of the total area of the test plate
1 point: The rust area is 30% or more of the total area of the test plate
[0062]
<Evaluation score of rust test (ASTMD610-85)>
10 points: No rust or rusting area less than 0.03% of total area of test plate
Nine points: Rust area is 0.03% or more and less than 0.1% of the total area of the test plate
8 points: Rust area is 0.1% or more and less than 0.3% of the total area of the test plate
7 points: Rust area is 0.3% to less than 1% of the total area of the test plate
6 points: Rust area is 1% or more and less than 3% of the total area of the test plate
5 points: Rust area is 3% or more and less than 10% of the total area of the test plate
4 points: Rust area is 10% or more and less than 16% of the total area of the test plate
3 points: Rust area is 16% or more and less than 33% of the total area of the test plate
2 points: Rust area is 33% or more and less than 50% of the total area of the test plate
1 point: Rust area is 50% or more of the total area of the test plate
[0063]
<Evaluation score of cross-cut test>
10 points: Each cut is thin and smooth on both sides.
There is no peeling at a glance.
9 points: The cut is slightly thick.
8 points: There is slight peeling at the intersection of cuts, there is no peeling at a glance of the square, and the area of the defect is within 5% of the total square area.
7 points: There is peeling at both sides of the cut and at the intersection, and the area of the defect is less than 5% of the total square area.
6 points: There is peeling on both sides of the cut and the intersection, and the area of the defect is 5% or more and less than 15% of the total square area.
5 points: The width of the peeling due to the cut is wider than “6 points”, and the area of the missing part is 15% or more and less than 25% of the total square area.
4 points: The width of peeling due to cuts is wide, and the area of the missing part is 25% or more and less than 35% of the total square area.
3 points: There is peeling at a glance of the square, and the area is within 35% of the total square area.
2 points: Peeling due to cuts is larger than “3 points”, and the area of the defect is 35% or more and less than 50% of the total square area.
1 point: The peeling due to the cut is larger than “2 points”, and the area is 50% or more and less than 70% of the total square area.
0 point: The area of peeling is 70% or more of the total square area.
[0064]
[referenceExample 2]
  referenceIn Example 1,referenceInstead of the water blast treatment of Example 1, except that the water blast treatment was carried out under the condition of a water pressure of 20 MPa using water to which an abrasive (garnet particles 90% by weight and zinc particles 10% by weight) was added.referenceIn the same manner as in Example 1, a test piece for anticorrosion test was obtained.
[0065]
  Using the test for anticorrosion test obtained as described above,referenceIn the same manner as in Example 1, the degree of swelling of the coating film, the degree of rusting, and the adhesion were evaluated, and the coating film sewage penetration from the cut portion was measured.
[0066]
These results are shown in Table 1.
[0067]
[referenceExample 3]
  An inorganic zinc-based shop primer (trade name Wellbond H, manufactured by China Paint Co., Ltd.) is applied to a 300mm x 150mm x 3.2mm steel plate that has been sandblasted and exposed to the outside for one month. did. This sandblasting treatment was performed under the condition of air pressure of 0.5 MPa using No. 5 silica sand as a polishing material.
[0068]
Subsequently, the two coated steel sheets were butt welded and further exposed outdoors for 3 months to generate rust in the welded portion.
Next, the entire surface of the butt weld plate was subjected to a water blast treatment under the condition of a water pressure of 200 MPa, and then a functional anticorrosive paint (trade name: Bismax, manufactured by China Paint Co., Ltd.) was touched up on the weld line.
[0069]
  Next, a tar epoxy anticorrosive paint (trade name Viscon HB-200, manufactured by China Paint Co., Ltd.) was applied to the surface of the butt weld plate so that the dry film thickness was 200 μm, and dried at 20 ° C. for 7 days. A test piece for anticorrosion test was obtained. Using the test for anticorrosion test obtained as described above,referenceIn the same manner as in Example 1, the degree of swelling of the coating film, the degree of rusting, and the adhesion were evaluated, and the coating film sewage penetration from the cut portion was measured.
[0070]
These results are shown in Table 1.
[0071]
[Comparative Example 1]
An inorganic zinc-based shop primer (trade name Wellbond H, manufactured by China Paint Co., Ltd.) is applied to a 300mm x 150mm x 3.2mm steel plate that has been sandblasted and exposed to the outside for one month. did. This sandblasting treatment was performed under the condition of air pressure of 0.5 MPa using No. 5 silica sand as a polishing material.
[0072]
Subsequently, the two coated steel sheets were butt welded and further exposed outdoors for 3 months to generate rust in the welded portion.
Next, the entire surface of the butt weld plate is subjected to a sandblast treatment, and then a tar epoxy anticorrosive paint (trade name: Viscon HB-200, manufactured by China Paint Co., Ltd.) is applied to the surface so that the dry film thickness becomes 200 μm. And dried at 20 ° C. for 7 days to obtain a test piece for anticorrosion test. This sandblasting process was also performed under the condition of air pressure of 0.5 MPa using No. 5 silica sand as a polishing material.
[0073]
  Using the anticorrosion test specimen obtained as described above,referenceIn the same manner as in Example 1, the degree of swelling of the coating film, the degree of rusting, and the adhesion were evaluated, and the coating film sewage penetration from the cut portion was measured. These results are shown in Table 1.
[0074]
[Comparative Example 2]
  In Comparative Example 1, a test piece for an anticorrosion test was obtained in the same manner as in Comparative Example 1, except that the water blast treatment was performed under the condition of a water pressure of 200 MPa instead of the sand blast treatment applied to the butt weld plate. Using the anticorrosion test specimen obtained as described above,referenceIn the same manner as in Example 1, the degree of swelling of the coating film, the degree of rusting, and the adhesion were evaluated, and the coating film sewage penetration from the cut portion was measured.
[0075]
These results are shown in Table 1.
[0076]
[Comparative Example 3]
  In Comparative Example 1, a test piece for anticorrosion test was obtained in the same manner as in Comparative Example 1 except that the sandblast treatment applied to the butt weld plate was not performed. Using the anticorrosion test specimen obtained as described above,referenceIn the same manner as in Example 1, the degree of swelling of the coating film, the degree of rusting, and the adhesion were evaluated, and the coating film sewage penetration from the cut portion was measured.
[0077]
These results are shown in Table 1.
[0078]
[referenceExample 4]
  After applying an inorganic zinc-based shop primer (trade name Wellbond H, manufactured by China Paint Co., Ltd.) to a sandblasted 300 mm x 150 mm x 3.2 mm steel plate so that the dry film thickness is 15 μm, tar epoxy system An anticorrosion paint (trade name: Viscon HB-200, manufactured by China Paint Co., Ltd.) was applied so that the dry film thickness was 200 μm. This sandblasting treatment was performed under the condition of air pressure of 0.5 MPa using No. 5 silica sand as a polishing material.
[0079]
Next, the coating film was peeled off to a width of 30 mm at the center of the coated steel sheet, and immersed in 3% saline for 3 months to partially rust.
Next, water blasting treatment was performed on the rusted portion of the coated steel sheet using water to which an abrasive (garnet particles 90% by weight and zinc particles 10% by weight) was added. An anticorrosive paint (trade name: Viscon HB-200, manufactured by China Paint Co., Ltd.) was applied to a dry film thickness of 200 μm and dried at 20 ° C. for 7 days to obtain an anticorrosion test specimen.
[0080]
  Using the anticorrosion test specimen obtained as described above,referenceIn the same manner as in Example 1, the degree of swelling of the coating film, the degree of rusting, and the adhesion were evaluated, and the coating film sewage penetration from the cut portion was measured. These results are shown in Table 1.
[0081]
[Comparative Example 4]
  referenceIn Example 4,referenceExcept that the water blast treatment was performed under the condition of a water pressure of 200 MPa instead of the water blast treatment of Example 4,referenceIn the same manner as in Example 4, a test piece for anticorrosion test was obtained. Using the anticorrosion test specimen obtained as described above,referenceIn the same manner as in Example 1, the degree of swelling of the coating film, the degree of rusting, and the adhesion were evaluated, and the coating film sewage penetration from the cut portion was measured.
[0082]
These results are shown in Table 1.
[0083]
[Table 1]

[0084]
(Improvement of paint film performance and paint environment according to the present invention)
When the outer plate part, deck part, and ballast tank part of a 258,000-ton tanker constructed as a new ship are constructed by the painting method of the present invention shown below, the improvement in the following items is shown below. Comparison was made with coating method-1 (sand, grit blast treatment) and coating method-2 (power tool treatment (treatment with wire brush, disc sander)).
[0085]
The coating method of the present invention;
Mainly, the rust generation part of the weld line was subjected to water blast treatment until the grade of ISO Sa2.5 was reached, and general parts other than the rust generation part were removed with dust, dust, and other dusts by water sweep blast treatment. In this water blasting treatment, a mixture of 90% by weight of garnet particles and 10% by weight of zinc powder was used as a polishing material at a ratio of 5% by volume to water. In addition, the water sweep blast treatment was performed only with water without using an abrasive.
[0086]
After finishing these treatments, a tar epoxy anticorrosive paint was applied to the treated surface.
Conventional coating method-1;
Mainly, the rust generation part of the weld line is drive-lasted until it reaches the ISO Sa2.5 grade using copper calami as the polishing material, and the general part other than the rust generation part is free of dust, debris and other dust. Removed by sweep blasting. After finishing these treatments, a tar epoxy anticorrosive paint was applied to the treated surface.
[0087]
Conventional coating method-2;
Mainly, the rust generating part of the weld line is processed with a disk sander until it reaches the ISO St-3 grade, and the general part other than the rust generating part is removed with dust, dust and other dust by a simple disk sander process. . After finishing these treatments, a tar epoxy anticorrosive paint was applied to the treated surface.
[0088]
In addition, the numerical value of the improvement (improvement) degree was calculated from the conventional coating method-1 and the coating method-2 with the coating method of the present invention as 100.
1. Improvement of coating film performance
(1) Residuality of inorganic zinc-based shop primer
It was calculated from the residual amount of inorganic zinc-based shop primer by various surface treatments (the smaller the numerical value obtained from the following calculation formula, the lower the residual property, the better).
[0089]
Calculation formula;
(Amount of shop primer after surface treatment) ÷ (Amount of shop primer before surface treatment) × 100
(2) Removal efficiency of corrosive substances in small pits or holes
It was calculated from the remaining amount of corrosive substances in the pits or holes after various surface treatments (the smaller the value obtained from the following calculation formula, the lower the removal efficiency is).
[0090]
Calculation formula;
(Amount of corrosive substances removed in pits and holes per surface area after surface treatment) ÷ (Amount of corrosive substances in pits and holes per surface area before surface treatment) x 100
(3) Uniform surface treatment
It was calculated from the removal grade of rust, dust, corrosive substances, etc. on the treated surface (the smaller the value obtained from the formula below, the less uniform surface treatability is indicated).
[0091]
Calculation formula;
(Removal area of rust / dust / corrosive substance per fixed area after surface treatment) / (Exclusive area of rust / dust / corrosive substance per fixed area before surface treatment) × 100
(4) Turning property after surface treatment
It was calculated from the degree of turning after the surface treatment (indicating that the smaller the numerical value obtained from the following calculation formula, the better the turning property).
[0092]
Calculation formula;
(Area where no turning occurs after surface treatment) ÷ (Area where no turning occurs before surface treatment) × 100
(5) Adhesion of top coat
It calculated by investigating the adhesiveness of top coat (it shows that adhesiveness is so bad that the numerical value calculated | required from the following formula is small). That is, the adhesiveness after the lapse of time was evaluated by the evaluation score of the aforementioned cross cut test.
2. Improvement of painting work environment
(1) Dust scattering properties
It was calculated by measuring the amount of dust scattered around the work place (the smaller the value obtained from the formula below, the greater the dust scattering).
[0093]
Calculation formula;
(Amount of scattered dust in the coating method of the present invention) ÷ (Amount of scattered dust in the conventional coating method-1 or 2) × 100
(2) Dust aftertreatment
It calculated from the processing area per unit time of the scattered dust after the surface treatment work was completed (the smaller the value obtained from the following calculation formula, the larger the post-treatment).
[0094]
Calculation formula;
(Dust treatment area in the conventional method) ÷ (Dust treatment area in the present invention) × 100
(3) Simultaneous rapid workability of surface treatment and cleaning
It calculated from the lapping work time of the surface treatment work and the cleaning work (indicating that the smaller the numerical value obtained from the following calculation formula, the shorter the lapping work time).
[0095]
Calculation formula;
(Lap time according to the conventional method) ÷ (Lap time according to the present invention) × 100
(4) Ease of processing work
Calculated from various protective measures such as dust-proof measures, waterproof measures, high-pressure injection measures, etc.
[0096]
Calculation formula;
(Various countermeasure man-hours of the present invention) ÷ (conventional countermeasure man-hours) × 100
(5) Processing efficiency
It calculated from the processing area per unit time (it shows that efficiency is so bad that the numerical value calculated | required from the following formula is small).
[0097]
Calculation formula;
(Treatment area per fixed time according to the conventional method) / (Treatment area per fixed time according to the present invention) × 100
(6) Economics of processing
It was calculated from equipment maintenance costs, depreciation costs, personnel costs, etc. (The smaller the value obtained from the formula below, the lower the economic efficiency).
[0098]
Calculation formula;
(Various expenses per unit area according to the present invention) / (Various expenses per unit area according to the conventional method) × 100
The above calculation results are shown in Table 2.
[0099]
[Table 2]

Claims (12)

Rinsed parts of ships or steel structures assembled by welding steel materials with zinc-based shop primer on the surface are subjected to water blasting, and general parts other than rusting parts are subjected to water sweep blasting and then overcoated. A method of painting a ship or a steel structure,
During the water blast treatment, the abrasive (A) is blasted with water,
A ship or steel structure coating method characterized by blasting only with water during the water sweep blasting . After the zinc-based anticorrosion paint is touched up on the coating damage part of the zinc-based shop primer of a ship or steel structure assembled by welding steel materials with a zinc-based shop primer on the surface, the ship or steel structure 2. The coating method according to claim 1, wherein the rust generation part of the object is subjected to the water blasting process , and the general part other than the rust generation part is subjected to a water sweep blasting process . After subjecting the ship or steel structure assembled by welding steel materials with a zinc-based shop primer to the surface, the rust generation part of the steel structure is subjected to the water blast treatment, and the general part other than the rust generation part is subjected to the water sweep blast treatment .
The coating paint damaged part, the weld seam part and the sharp edge part of the zinc-based shop primer are coated with an anti-corrosion paint having affinity with the substrate and the top coat, and then the top coat is applied. The coating method according to 1 or 2. The coating method according to any one of claims 1 to 3, wherein the scouring material (A) is a scouring material composed of metal particles (a1) that are baser than iron. The said scouring material (A) is the scouring material which consists of a mixture of the metal particle (a1) based from iron and inorganic fine particles (a2) other than a metal , The any one of Claims 1-3 characterized by the above-mentioned. the method of coating according to any. The coating method according to any one of claims 1 to 5 , wherein water containing a corrosion inhibitor (B) is used in the water blast treatment. Ri water pressure 0.1~300MPa der in the water blasting,
Water pressure in the water sweep blasting method for coating according to any one of claims 1 to 6, characterized in 10~300MPa der Rukoto. In repair painting of the surface of a ship or steel structure assembled by welding steel materials, water blasting for blasting the abrasive material (A) together with water on the surface rust generation part, general parts other than the rust generation part on the surface A method of painting a ship or steel structure, characterized by applying a water sweep blasting treatment for blasting with water only, followed by overcoating. The coating method according to claim 8 , wherein the scouring material (A) is a scouring material composed of metal particles (a1) that are baser than iron. The coating material according to claim 8 , wherein the scouring material (A) is a scouring material composed of a mixture of metal particles (a1) that are lower than iron and inorganic fine particles (a2) other than metal. Method. The coating method according to any one of claims 8 to 10 , wherein water containing a corrosion inhibitor (B) is used in the water blast treatment. Ri water pressure 0.1~300MPa der in the water blasting,
The water pressure in the water sweep blasting method for coating according to any one of claims 8 to 11, wherein 10~300MPa der Rukoto.