JP3366693B2 - Anticorrosion coating method - Google Patents
Anticorrosion coating methodInfo
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- JP3366693B2 JP3366693B2 JP18546193A JP18546193A JP3366693B2 JP 3366693 B2 JP3366693 B2 JP 3366693B2 JP 18546193 A JP18546193 A JP 18546193A JP 18546193 A JP18546193 A JP 18546193A JP 3366693 B2 JP3366693 B2 JP 3366693B2
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- monomer
- ester
- paint
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Description
【発明の詳細な説明】
【０００１】
【産業上の利用分野】本発明は、橋梁、タンク、プラン
ト、港湾設備、電力設備等の鉄鋼構造物の塗装において
簡単な素地調整で刷毛又はローラーで下塗り１回／上塗
り１回の２回塗りで厚膜で長期の耐久性塗膜が得られる
防食塗装方法に関するものである。
【０００２】
【従来の技術】従来鉄鋼構造物の塗装は、素地調整や塗
装方法の制約から悪素地面に適性のある油性さび止め塗
料や変性エポキシ樹脂塗料を下塗りとし、各種上塗り塗
料を組み合わせた塗装系が採用されている。すなわち、
通常鉄鋼構造物表面のさび面や旧塗膜を２〜３種ケレン
で素地調整し、油性さび止め塗料２回、合成樹脂調合ペ
イント中塗り塗料１回、同上塗り塗料１回（合計４回で
１２５μｍ）、或いは油性さび止め塗料２回、フェノー
ルＭＩＯ塗料１回、塩化ゴム中塗り塗料１回、同上塗り
塗料１回（合計５回で１８０μｍ）、或いは変性エポキ
シ樹脂塗料２回、塩化ゴム中塗り塗料１回、同上塗り塗
料１回（合計４回で１６５μｍ）、或いは変性エポキシ
樹脂塗料２回、ポリウレタン樹脂中塗り塗料１回、同上
塗り塗料１回（合計４回で１５５μｍ）塗装等の塗装シ
ステムが採用され、鉄鋼構造物の設置環境、耐用年数、
塗装費等を考慮し塗装システムを選択している。いずれ
も下塗り、中塗り、上塗りの３〜４種類の塗料を組み合
せて塗装する手間のかかる、繁雑な塗装システムとなっ
ている。また、鋼材の腐食に関し、塗装塗膜厚と耐用年
数について種々のデータが報告されているが（重防食塗
装の実際（日本鋼構造協会編：山海堂 昭和６３年２月
発行）Ｐ１０８〜１１０）、構造物の設置環境にもよる
が長期の耐用年数を期待するためには１２５〜１６０μ
ｍ以上の膜厚が必要と言われている。従って従来の重防
食システムでは４〜５回の塗り回数で膜厚を確保すると
同時に３〜４種類の塗料を用い各塗料間の層間付着性や
塗装間隔を考慮した塗装システムが採用されている。
【０００３】
【発明が解決しようとする課題】近年、鉄鋼構造物のメ
ンテナンスの施工費の増大、塗装職人の減少、景観や安
全衛生の重視等により、メンテナンスサイクルの長期化
によるトータルコストの削減、すなわち工期の短縮、環
境保全、安全施工、塗り替え周期の延長等が求められて
いる。しかしながら、従来の４〜５回塗りシステムでは
このような市場の要求に応えられないのが現状である。
例えば前記のような従来塗料を厚膜に塗装し塗り回数を
削減した場合、塗装時のたれ、塗膜の硬化不良、或いは
内部応力の増大による割れ、はがれ等の問題が生じ、美
観保持の点でも合成樹脂調合ペイントや塩化ゴム塗料で
は不十分であり耐候性が良いとされるポリウレタン樹脂
塗料でも限界がある。超耐候性のふっ素樹脂塗料では費
用がかかりすぎる。また、ポリウレタン樹脂上塗り塗料
やふっ素樹脂上塗り塗料を用い変性エポキシ樹脂塗料と
の省工程高耐候性塗装システムを組合せた場合でもポリ
オール／イソシアネート硬化の上塗り塗料と変性エポキ
シ樹脂下塗り塗料との塗装間隔は通常１〜７日と短く、
この期間を過ぎると下塗り／上塗り塗膜間の付着性が著
しく低下し、構造物の大型化や工事の長期化に伴い塗装
作業の大きな制約となっている。本発明はこのような現
状の課題を解決すべく２回塗りで長期の耐久性を発揮
し、塗り回数低減や工期の短縮、高耐候性塗装システム
での塗装間隔の延長等、メンテナンスコストの低減や施
工作業性の改善を計る防食塗装方法を提供するものであ
る。
【０００４】
【課題を解決するための手段】本発明は２回塗りで長期
の防食性と美観保持を発揮させるため、悪素地面適性に
優れた厚膜形成可能な下塗り塗料と超耐候性を有しコス
トパフォーマンスに優れた厚膜形成可能な上塗り塗料を
組み合わせることにより従来の塗装システムの課題を解
決した。すなわち鉄鋼構造物表面のさび面や旧塗膜、或
いはそれらの混在する素地をディスクサンダー等の電動
工具やスクレーパー、ワイヤーブラシ等の手工具で調整
し、刷毛又はローラー１回塗りで下塗り塗料を１００μ
ｍ程度、上塗り塗料を５０μｍ程度塗付し、合計１５０
μｍ程度の厚膜を確保して長期の防食性と美観を維持し
ようとするものである。
【０００５】本発明は、鉄鋼構造物にエポキシ当量１８
０〜５００のエポキシ樹脂１０〜３５重量部、可撓性エ
ポキシ樹脂２〜１０重量部、非反応性低分子量樹脂７〜
２０重量部、顔料４０〜６０重量部および硬化剤を含有
する下塗り塗料組成物を塗装し、ついで加水分解性アル
コキシシリル基を含有するアクリル酸（エステル）単量
体及び／又はメタクリル酸（エステル）単量体５〜２０
重量％、アクリル酸（エステル）単量体及び／又はメタ
クリル酸（エステル）単量体８０〜９５重量％及びその
他のビニル基を含有する重合性単量体０〜１５重量％を
反応してなる数平均分子量３０００〜６０００、ガラス
転移点１０〜３０℃のアクリルシリコン樹脂２０〜４０
重量部、加水分解性アルコキシシリル基を含有するアク
リル酸（エステル）単量体及び／又はメタクリル酸（エ
ステル）単量体５〜２０重量％とアクリル酸（エステ
ル）単量体及び／又はメタクリル酸（エステル）単量体
８０〜９５重量部％を反応してなる数平均分子量１００
００〜２５０００、ガラス転移点０〜１０℃のアクリル
シリコン樹脂３〜１５重量部、顔料２５〜５０重量部を
含有する上塗り塗料組成物を塗装することを特徴とする
防食塗装方法である。
【０００６】本発明においては、塗料のハイソリッド化
（下塗り塗料の不揮発分を好ましくは８５重量％以上、
上塗り塗料の不揮発分を好ましくは７０重量％以上）が
容易で且つレオロジーコントロールにより刷毛、ローラ
ーで厚膜に塗装できる。厚膜化による前記の問題につい
ては樹脂組成の検討により乾燥性を改善し、旧塗膜への
付着性を向上させ、また下塗り塗料に可撓性を付与する
ことで経時によるさび面や旧塗膜からの割れ、はがれを
防止した。また塗り回数の低減による防食性低下の問題
は、さび面への浸透性、防食性向上、ピンホール発生の
低減、酸素、水分の低透過性の上塗り塗料の使用により
解決した。更に上塗り塗料に耐候性が良好で下塗り塗料
との付着性の良好な上塗り塗料を厚膜に塗装することで
下塗り／上塗り塗装間隔の延長、長期の美観保持、防食
性への寄与を実現した。本発明の、下塗り塗料にはエポ
キシ当量１８０〜５００のビスフェノールＡ型及び／或
いは同Ｆ型及び／或いは同ＡＤ型エポキシ樹脂等のエポ
キシ樹脂を１０〜３５重量部使用し素地、旧塗膜或いは
上塗り塗料との付着性、防食性を発現する。エポキシ当
量が１８０より小さい場合は塗膜の可撓性が著しく低下
し、５００より大きいと乾燥性が低下し、またハイソリ
ッド化できない。その使用量が１０重量部より少ない場
合は防食性が低下し、３５重量部を越すと上塗り塗料と
の付着性が低下する。
【０００７】また、塗膜の可撓性を長期にわたり保持す
るためウレタン変性エポキシ樹脂、ダイマー酸変性エポ
キシ樹脂或いはポリエーテル変性エポキシ樹脂等の可撓
性エポキシ樹脂を２〜１０重量部使用する。使用量が２
重量部より少ない場合は可撓性が発揮されず、１０重量
部を越すと乾燥性が不良で、また上塗り塗料との付着性
が低下する。更にさび面への浸透性、防食性や旧塗膜と
の付着性を上げるため、またハイソリッド化するため、
低分子量で可撓性のあるキシレン樹脂、トルエン樹脂、
ケトン樹脂等の芳香族重合物やシクロペンタジエン等の
石油樹脂等の非反応性低分子量樹脂を７〜２０重量部使
用する。使用量が７重量部より少ない場合はさび面への
浸透性、防食性が不十分で、２０重量部を越えると乾燥
性の低下、上塗り塗膜へのブリードや付着不良を起こ
す。顔料としては酸化チタン、カーボン、弁柄、オーカ
ー等の着色顔料、タルク、クレー、マイカ等の体質顔
料、鉛系、クロム系或いはリン酸系、モリブデン酸系等
の防錆顔料、雲母状酸化鉄、アルミニウム、亜鉛等のリ
ン片状顔料や金属粉等、通常の塗料に使用される顔料が
４０〜６０重量部の範囲で使用できる。使用量が４０重
量部より少ない場合は厚膜に塗り難く上塗り塗料との付
着性も低下する。６０重量部を越すと防食性が低下す
る。また、本発明の下塗り塗料には必要に応じ各種添加
剤、希釈剤、溶剤が使用できる。また本発明の下塗り塗
料には上記成分の硬化剤として通常の２液型エポキシ樹
脂塗料に使用されるポリアミドアミン、芳香族ポリアミ
ン、脂肪族ポリアミン、脂環式ポリアミン等のアミン類
が使用できるが、ハイソリッド化のためには脂肪族ポリ
アミンや脂環式ポリアミンの使用が望ましい。かかる硬
化剤は、使用時に前記成分と混合されるもので、使用量
は、およそ３〜２５重量部が好ましい。
【０００８】本発明の上塗り塗料にはハイソリッド（不
揮発分７０重量％以上）で耐候性や可撓性を発揮させる
ため、加水分解性アルコキシシリル基含有のアクリル酸
（エステル）単量体及び／又はメタクリル酸（エステ
ル）単量体５〜２０重量％とアクリル酸（エステル）単
量体及び／又はメタクリル酸（エステル）単量体８０〜
９５重量％及び必要によりその他のビニル基含有重合性
単量体０〜１５重量％を常法により反応してなる数平均
分子量３０００〜６０００、ガラス転移点（理論値）１
０〜３０℃のアクリルシリコン樹脂を２０〜４０重量部
使用する。加水分解性アルコキシシリル基含有のアクリ
ル酸（エステル）単量体及び／又はメタクリル酸（エス
テル）単量体が５重量％より少ない場合耐候性が低く、
２０重量％を越すと可撓性が低下する。アクリルシリコ
ン樹脂の分子量が３０００より小さい場合は耐候性及び
可撓性が低下し、６０００を越すと塗装作業性を考慮し
たハイソリド化が困難になる。また、ガラス転移点が１
０℃より低い場合、耐候性が低下し、３０℃より高いと
可撓性が低下する。アクリルシリコン樹脂の使用量が２
０重量部より少ない場合は塗膜の光沢が低く耐候性も劣
る。４０重量部を越すとたれ易く厚膜塗装が難しくな
る。
【０００９】また、本発明の上塗り塗料においては、前
記アクリルシリコン樹脂による耐候性や可撓性低下を少
なくするため、前記アクリルシリコン樹脂と同様な組成
で数平均分子量１００００〜２５０００、ガラス転移点
（理論値）０〜１０℃のアクリルシリコン樹脂を３〜１
５重量部の範囲で併用する。分子量が１００００より小
さい場合は耐候性や可撓性の改善に効果がなく、２５０
００より大きいとハイソリッド化できない。またガラス
転移点が０℃より低い場合は乾燥性や耐候性が著しく低
下し、１０℃より高いと可撓性の改善ができない。その
使用量が３重量部より少ない場合は効果がなく、１５重
量部を越すとハイソリッド化ができなくなる。
【００１０】本発明の上塗り塗料に使用する顔料は酸化
チタン、カーボン、弁柄、オーカー、シアニンブルー、
シアニングリーン、有機レッド、有機イエロー等の着色
顔料、硫酸バリウム、シリカ、タルク等の体質顔料、そ
の他アルミニウム粉、雲母状酸化鉄、パール顔料等が２
５〜５０重量部の範囲で使用できる。その使用量が２５
重量部より少ない場合は厚膜に塗装できず、５０重量部
を越すと耐候性が低下する。また、必要に応じ各種添加
剤、溶剤を使用できる。上塗り塗料の硬化には錫系、酸
系或いは塩基系触媒を使用する。本発明においては、前
記の下塗り塗料と上塗り塗料を組み合せて塗装するもの
であり、鉄鋼構造物の表面を２〜３種類ケレンの比較的
簡単な素地調整を行い、下塗り塗料は希釈溶剤で適正粘
度に調整し、刷毛又はローラーで、１００μｍ程度塗装
する。勿論エアレス塗装も可能である。次に、通常１日
〜３０日後上塗り塗料を希釈溶剤で適正粘度に調整し、
刷毛又はローラーで５０μｍ程度に塗装することにより
長期の防食性と耐候性を発揮するものである。
【００１１】
【実施例】
（試験例１〜１１） 下塗り塗料の組成と品質
下塗り塗料の組成と品質の関係をみるため表１の組成で
塗料を作成し品質を確認した。塗料粘度は２０〜４０ｐ
ｏｉｓｅ（２０℃）になるよう溶剤配合量を決めた。そ
の結果、表２に示すように試験例３の本発明の下塗り塗
料が良好な品質を示した。
【００１２】
【表１】
【００１３】
【表２】【００１４】（試験例１２〜２４）上塗り塗料の組成と
品質
上塗り塗料の組成と品質の関係をみるため表３の組成で
塗料を作成し品質を確認した。塗料粘度は５〜２０ｐｏ
ｉｓｅ（２０℃）になるよう溶剤配合量を決めた。その
結果、表４に示すように試験例１４の本発明の下塗り塗
料が良好な品質を示した。
【００１５】
【表３】【００１６】
【表４】【００１７】（実施例１）および（比較例１〜４）
上記試験例で作成した試験例３の下塗り塗料と試験例１
４の上塗り塗料からなる本発明の塗装システムと従来の
塗装システムとの品質を比較した。その結果を表５に示
す。
【００１８】
【表５】【００１９】
【発明の効果】本発明によれば、橋梁、タンク、プラン
ト、港湾設備、電力設備等鋼構造物のメンテナンス塗装
において２〜３種ケレン程度の素地調整で刷毛又はロー
ラーで前記下塗り塗料と上塗り塗料の２種類の塗料を各
１回の２回塗りすることで長期の防食性と美観を維持で
きる。従って、従来の３〜４種類の塗料を用いて、それ
らを４〜５回塗装する方法に比し、工費、工期、環境安
全等の面でも大幅な改善ができる。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of painting steel structures such as bridges, tanks, plants, harbor facilities, power facilities, etc., with a simple base adjustment by brush or roller. The present invention relates to an anticorrosion coating method in which a thick film and a long-lasting durable coating film can be obtained by two coats of one coat / one coat. 2. Description of the Related Art Conventionally, steel structures are coated with an oil-based rust preventive paint or a modified epoxy resin paint which is suitable for rough ground due to restrictions on the base material and the coating method, and various kinds of top coats are combined. A paint system is used. That is,
Normally, the rust surface and the old paint film on the surface of steel structures are adjusted with two or three kinds of kerosene, oil-based rust preventive paint twice, synthetic resin blended paint intermediate paint once, same top paint once (total of 4 coats) 125μm) or 2 times of oil-based rust preventive paint, 1 time of phenol MIO paint, 1 time of chlorinated rubber intermediate paint, 1 time of the same top coat (180μm in total of 5 times), or 2 times of modified epoxy resin paint, 2 times of chlorinated rubber paint Coating system such as paint once, top coat once (total 4 times 165 μm), or modified epoxy resin paint 2 times, polyurethane resin middle coat 1 time, same top coat once (total 4 times 155 μm) The installation environment of steel structures, service life,
The painting system is selected in consideration of the painting cost. All of these are complicated coating systems which require time and effort to apply a combination of three to four types of coatings of undercoating, intermediate coating and topcoating. In addition, various data have been reported on the corrosion of steel materials with respect to the thickness of the coating film and the service life thereof. (Actual application of heavy duty anti-corrosion coating (edited by Japan Steel Structural Association: published by Sankaido February 1988) P108-110) Although it depends on the installation environment of the structure, in order to expect a long service life, 125 to 160 μm is required.
It is said that a film thickness of at least m is required. Therefore, in the conventional heavy-duty anticorrosion system, a coating system is adopted in which the film thickness is secured by 4 to 5 coatings, and at the same time, three to four types of coatings are used and the interlayer adhesion between the coatings and the coating interval are taken into consideration. [0003] In recent years, due to an increase in construction costs for maintenance of steel structures, a decrease in painters, an emphasis on landscapes and health and safety, etc., reduction in total costs due to prolonged maintenance cycles, That is, there is a demand for shortening the construction period, environmental protection, safe construction, extending the repainting cycle, and the like. However, at present, conventional 4-5 coating systems cannot meet such market demands.
For example, when the conventional paint as described above is applied to a thick film and the number of times of application is reduced, problems such as sagging at the time of coating, poor curing of the coating, or cracking due to an increase in internal stress, peeling, etc. occur, and the point of maintaining aesthetic appearance. However, there is a limit to polyurethane resin coatings which are considered to be insufficient with synthetic resin blended paints or chlorinated rubber coatings and have good weather resistance. Super-weather-resistant fluoroplastic coatings are too expensive. Even when a polyurethane resin top coat or fluoro resin top coat is used and a process-saving high weather resistance coating system is combined with a modified epoxy resin paint, the coating interval between the polyol / isocyanate-cured top coat and the modified epoxy resin base coat is usually 1-7 days short,
After this period, the adhesion between the undercoat and the top coat is significantly reduced, and the coating work is greatly restricted due to the enlargement of the structure and the prolonged construction. The present invention achieves long-term durability with two coats in order to solve such current problems, and reduces maintenance costs, such as reducing the number of coats, shortening the construction period, and extending the coating interval in a high weather resistant coating system. And an anticorrosion coating method for improving workability and construction workability. SUMMARY OF THE INVENTION The present invention provides an undercoating material capable of forming a thick film having excellent suitability for a bad ground and a super-weathering resistance in order to exhibit a long-term anticorrosion property and a good appearance by two coats. The problem of the conventional coating system was solved by combining an overcoating material capable of forming a thick film with excellent cost performance. That is, the rust surface and the old paint film on the surface of the steel structure, or the base material in which they are mixed are adjusted with a power tool such as a disc sander, a scraper, or a hand tool such as a wire brush.
m, top coat paint is applied about 50μm, total 150
It is intended to maintain a long-term anticorrosion property and aesthetic appearance by securing a thick film of about μm. [0005] The present invention relates to a steel structure having an epoxy equivalent of 18;
10 to 35 parts by weight of an epoxy resin of 0 to 500, 2 to 10 parts by weight of a flexible epoxy resin, 7 to 7 parts of a non-reactive low molecular weight resin
An undercoat coating composition containing 20 parts by weight, 40 to 60 parts by weight of a pigment and a curing agent is applied, and then an acrylic acid (ester) monomer and / or methacrylic acid (ester) containing a hydrolyzable alkoxysilyl group is applied. Monomer 5-20
% By weight, 80 to 95% by weight of acrylic acid (ester) monomer and / or methacrylic acid (ester) monomer and 0 to 15% by weight of other vinyl group-containing polymerizable monomer. Acrylic silicone resin 20-40 having a number average molecular weight of 3000-6000 and a glass transition point of 10-30 ° C
5 to 20% by weight of an acrylic acid (ester) monomer and / or methacrylic acid (ester) monomer containing a hydrolyzable alkoxysilyl group and an acrylic acid (ester) monomer and / or methacrylic acid (Ester) A number average molecular weight of 100 obtained by reacting 80 to 95 parts by weight of a monomer.
The anticorrosion coating method comprises applying a topcoat composition containing 3 to 15 parts by weight of an acrylic silicone resin having a glass transition temperature of 0 to 25000 and a pigment of 25 to 50 parts by weight. In the present invention, the coating composition is made to be a high solid (the non-volatile content of the undercoating composition is preferably 85% by weight or more,
The non-volatile content of the top coat is preferably 70% by weight or more), and a thick film can be applied with a brush or roller by rheological control. Regarding the above-mentioned problem due to thickening, improvement of the drying property by studying the resin composition, improvement of the adhesion to the old coating film, and the provision of flexibility to the undercoating paint allow the rust surface and the old coating to be applied over time. Cracking and peeling from the film were prevented. In addition, the problem of the reduction in the corrosion resistance due to the reduction in the number of coatings was solved by using a topcoat paint having improved permeability to the rust surface, improved corrosion protection, reduced pinhole generation, and low permeability of oxygen and moisture. Furthermore, by applying a thick topcoat having good weather resistance and good adhesion to the undercoat as a topcoat, it is possible to extend the interval between the undercoat / overcoat, maintain the long-term appearance, and contribute to anticorrosion. The undercoat paint of the present invention uses 10 to 35 parts by weight of an epoxy resin such as bisphenol A type and / or F type and / or AD type epoxy resin having an epoxy equivalent of 180 to 500, and is used as a base material, an old paint film or a top coat. Develops adhesion to paint and anti-corrosion properties. When the epoxy equivalent is less than 180, the flexibility of the coating film is remarkably reduced, and when it is more than 500, the drying property is reduced and the high solid cannot be obtained. If the amount is less than 10 parts by weight, the anticorrosion property will be reduced, and if it exceeds 35 parts by weight, the adhesion to the topcoat will be reduced. In order to maintain the flexibility of the coating film for a long period of time, 2 to 10 parts by weight of a flexible epoxy resin such as urethane-modified epoxy resin, dimer acid-modified epoxy resin or polyether-modified epoxy resin is used. 2 used
When the amount is less than 10 parts by weight, the flexibility is not exhibited, and when the amount exceeds 10 parts by weight, the drying property is poor and the adhesion to the top coating material is reduced. Furthermore, in order to increase the permeability to the rust surface, anticorrosion properties and adhesion with the old coating film, and to make it high solid,
Low molecular weight and flexible xylene resin, toluene resin,
A non-reactive low molecular weight resin such as an aromatic polymer such as a ketone resin or a petroleum resin such as cyclopentadiene is used in an amount of 7 to 20 parts by weight. If the amount is less than 7 parts by weight, the permeability to the rust surface and the corrosion resistance are insufficient, and if it exceeds 20 parts by weight, the drying property is reduced, and bleeding and poor adhesion to the top coat are caused. Pigments include coloring pigments such as titanium oxide, carbon, red iron oxide, and ocher; extender pigments such as talc, clay, and mica; rust-preventive pigments such as lead-based, chromium-based or phosphoric acid-based, and molybdic acid-based, and mica-like iron oxide. Pigments used in ordinary paints, such as flaky pigments such as aluminum and zinc and metal powders, can be used in the range of 40 to 60 parts by weight. If the amount is less than 40 parts by weight, it is difficult to apply the composition to a thick film, and the adhesion to the top coating material is reduced. If it exceeds 60 parts by weight, the anticorrosion property is reduced. Various additives, diluents, and solvents can be used in the undercoat paint of the present invention as needed. In the undercoat paint of the present invention, amines such as polyamidoamine, aromatic polyamine, aliphatic polyamine and alicyclic polyamine used in ordinary two-pack type epoxy resin paint can be used as a curing agent of the above components, It is desirable to use an aliphatic polyamine or an alicyclic polyamine for high solidification. Such a curing agent is mixed with the above components at the time of use, and the amount used is preferably about 3 to 25 parts by weight. [0008] In order to exhibit weather resistance and flexibility in a high solid (non-volatile content of 70% by weight or more) in the top coat of the present invention, a hydrolyzable alkoxysilyl group-containing acrylic acid (ester) monomer and / or Alternatively, 5 to 20% by weight of a methacrylic acid (ester) monomer and 80 to 80% of an acrylic acid (ester) monomer and / or a methacrylic acid (ester) monomer
A number average molecular weight of 3,000 to 6,000, a glass transition point (theoretical value) of 1 obtained by reacting 95% by weight and optionally 0 to 15% by weight of other vinyl group-containing polymerizable monomers according to a conventional method.
20-40 parts by weight of acrylic silicone resin at 0-30 ° C is used. When the acrylic acid (ester) monomer and / or methacrylic acid (ester) monomer containing a hydrolyzable alkoxysilyl group is less than 5% by weight, the weather resistance is low,
If it exceeds 20% by weight, the flexibility is reduced. When the molecular weight of the acrylic silicone resin is smaller than 3000, the weather resistance and flexibility are reduced, and when the molecular weight exceeds 6000, it becomes difficult to form a high solid in consideration of coating workability. In addition, the glass transition point is 1
When the temperature is lower than 0 ° C., the weather resistance decreases, and when the temperature is higher than 30 ° C., the flexibility decreases. The amount of acrylic silicone resin used is 2
If the amount is less than 0 parts by weight, the gloss of the coating film is low and the weather resistance is poor. If the amount exceeds 40 parts by weight, the film is easily sagged and thick film coating becomes difficult. Further, in the top coating composition of the present invention, in order to reduce the deterioration of weather resistance and flexibility due to the acrylic silicone resin, a number average molecular weight of 10,000 to 25,000 and a glass transition point ( Theoretical value) Acrylic silicone resin of 0-10 ° C is 3-1
Use together within the range of 5 parts by weight. If the molecular weight is less than 10,000, there is no effect on the improvement of weather resistance and flexibility,
If it is larger than 00, it cannot be made high solid. When the glass transition point is lower than 0 ° C., the drying property and weather resistance are remarkably reduced. When the glass transition point is higher than 10 ° C., the flexibility cannot be improved. When the amount is less than 3 parts by weight, there is no effect. When the amount exceeds 15 parts by weight, high solidification cannot be achieved. The pigment used in the top coat of the present invention is titanium oxide, carbon, red iron oxide, ocher, cyanine blue,
Coloring pigments such as cyanine green, organic red, and organic yellow; extender pigments such as barium sulfate, silica, and talc; and other aluminum powders, mica-like iron oxide, and pearl pigments.
It can be used in the range of 5 to 50 parts by weight. 25 usage
If the amount is less than 50 parts by weight, the weather resistance deteriorates. Various additives and solvents can be used as needed. A tin-based, acid-based or base-based catalyst is used for curing the top coat. In the present invention, the undercoating paint and the topcoating paint are combined and applied, and the surface of the steel structure is subjected to relatively simple base adjustment of 2 to 3 types of kerosene. And apply about 100 μm with a brush or roller. Of course, airless painting is also possible. Next, usually after 1 to 30 days, the top coat is adjusted to an appropriate viscosity with a diluting solvent,
By coating with a brush or a roller to about 50 μm, long-term corrosion resistance and weather resistance are exhibited. EXAMPLES (Test Examples 1 to 11) Composition and quality of undercoat paint To see the relationship between the composition and quality of undercoat paint, paints were prepared with the compositions shown in Table 1 and the quality was confirmed. Paint viscosity is 20-40p
The amount of the solvent was determined so as to obtain an oil (20 ° C.). As a result, as shown in Table 2, the undercoat paint of the present invention of Test Example 3 showed good quality. [Table 1] [Table 2] (Test Examples 12 to 24) Composition and quality of top coat In order to see the relationship between the composition and quality of the top coat, paints were prepared with the compositions shown in Table 3 and the quality was confirmed. Paint viscosity is 5-20po
The amount of the solvent was determined so that the temperature became 20 ° C. As a result, as shown in Table 4, the undercoat paint of the present invention of Test Example 14 showed good quality. [Table 3] [Table 4] (Example 1) and (Comparative Examples 1 to 4) Undercoat paint of Test Example 3 prepared in the above Test Examples and Test Example 1
The quality of the coating system of the present invention comprising 4 top coats and the quality of a conventional coating system were compared. Table 5 shows the results. [Table 5] According to the present invention, in the maintenance painting of steel structures such as bridges, tanks, plants, harbor facilities, electric power facilities, etc., the base coat is adjusted with a brush or a roller by adjusting the foundation of about 2 to 3 kinds of keren. By applying two types of paints, one each for the top coat and the top coat, it is possible to maintain long-term anticorrosion properties and aesthetic appearance. Therefore, compared with the conventional method of applying 3 to 4 types of paints and coating them 4 to 5 times, it is possible to greatly improve the work cost, the work period, the environmental safety, and the like.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ Ｃ０９Ｄ 133/06 Ｃ０９Ｄ 133/06 163/00 163/00 (58)調査した分野(Int.Cl.7，ＤＢ名) B05D 7/14 B05D 7/24 302 C09D 5/00 C09D 5/08 C09D 133/06 C09D 163/00 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 identification symbol FI C09D 133/06 C09D 133/06 163/00 163/00 (58) Fields surveyed (Int.Cl. 7 , DB name) B05D 7 / 14 B05D 7/24 302 C09D 5/00 C09D 5/08 C09D 133/06 C09D 163/00
Claims (1)
０のエポキシ樹脂１０〜３５重量部、可撓性エポキシ樹
脂２〜１０重量部、非反応性低分子量樹脂７〜２０重量
部、顔料４０〜６０重量部および硬化剤を含有する下塗
り塗料組成物を塗装し、ついで加水分解性アルコキシシ
リル基を含有するアクリル酸（エステル）単量体及び／
又はメタクリル酸（エステル）単量体５〜２０重量％、
アクリル酸（エステル）単量体及び／又はメタクリル酸
（エステル）単量体８０〜９５重量％及びその他のビニ
ル基を含有する重合性単量体０〜１５重量％を反応して
なる数平均分子量３０００〜６０００、ガラス転移点１
０〜３０℃のアクリルシリコン樹脂２０〜４０重量部、
加水分解性アルコキシシリル基を含有するアクリル酸
（エステル）単量体及び／又はメタクリル酸（エステ
ル）単量体５〜２０重量％とアクリル酸（エステル）単
量体及び／又はメタクリル酸（エステル）単量体８０〜
９５重量部％を反応してなる数平均分子量１００００〜
２５０００、ガラス転移点０〜１０℃のアクリルシリコ
ン樹脂３〜１５重量部、顔料２５〜５０重量部を含有す
る上塗り塗料組成物を塗装することを特徴とする防食塗
装方法。(57) [Claims 1] An epoxy equivalent of 180 to 50 for a steel structure.
0 to 10 parts by weight of an epoxy resin, 2 to 10 parts by weight of a flexible epoxy resin, 7 to 20 parts by weight of a non-reactive low molecular weight resin, 40 to 60 parts by weight of a pigment, and a curing agent. Painting, and then an acrylic acid (ester) monomer containing a hydrolyzable alkoxysilyl group and / or
Or 5 to 20% by weight of a methacrylic acid (ester) monomer,
Number average molecular weight obtained by reacting 80 to 95% by weight of an acrylic acid (ester) monomer and / or methacrylic acid (ester) monomer and 0 to 15% by weight of another polymerizable monomer having a vinyl group 3000-6000, glass transition point 1
20-40 parts by weight of acrylic silicone resin at 0-30 ° C,
5 to 20% by weight of acrylic acid (ester) monomer and / or methacrylic acid (ester) monomer containing a hydrolyzable alkoxysilyl group and acrylic acid (ester) monomer and / or methacrylic acid (ester) Monomer 80 ~
A number average molecular weight of 10,000 to 95% by weight
An anticorrosion coating method comprising applying a top coat composition containing 25,000, 3 to 15 parts by weight of an acrylic silicone resin having a glass transition point of 0 to 10 ° C, and 25 to 50 parts by weight of a pigment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18546193A JP3366693B2 (en) | 1993-06-28 | 1993-06-28 | Anticorrosion coating method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18546193A JP3366693B2 (en) | 1993-06-28 | 1993-06-28 | Anticorrosion coating method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH078905A JPH078905A (en) | 1995-01-13 |
| JP3366693B2 true JP3366693B2 (en) | 2003-01-14 |
Family
ID=16171198
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18546193A Expired - Lifetime JP3366693B2 (en) | 1993-06-28 | 1993-06-28 | Anticorrosion coating method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3366693B2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002080787A (en) * | 2000-09-06 | 2002-03-19 | Nippon Paint Co Ltd | Coating composition for determining film thickness and method for producing multilayer coating film |
| JP4891497B2 (en) * | 2001-08-22 | 2012-03-07 | 日鉄防蝕株式会社 | Method of coating polyamide resin-coated steel material and steel material coated by this method |
| US8541061B2 (en) * | 2005-08-26 | 2013-09-24 | Shikoku Research Institute Incorporated | Anticorrosion coating method for zinc-plated steel structure |
| JP5017502B2 (en) * | 2006-06-22 | 2012-09-05 | 関西ペイント販売株式会社 | Coating apparatus and method suitable for thick film coating of high viscosity paint |
| JP4971261B2 (en) * | 2008-07-07 | 2012-07-11 | 大日本塗料株式会社 | Corrosion protection for weathering steel |
| JP5271748B2 (en) * | 2009-02-20 | 2013-08-21 | Ｊｘ日鉱日石エネルギー株式会社 | Coating method and anticorrosion coating |
-
1993
- 1993-06-28 JP JP18546193A patent/JP3366693B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH078905A (en) | 1995-01-13 |
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