JP4610686B2 - Repair coating composition and equipment repair method - Google Patents
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Description
【０００１】
【発明の属する技術分野】
本発明は、鉄構造物、船舶、鋼管等の補修用塗料組成物及びこれを用いた設備補修方法に関するものである。
【０００２】
【従来の技術】
従来の防食塗料は、揺変剤を添加して垂れ限界を高めることは可能であるが、刷毛で塗装する場合、硬化していない塗膜の上に再度塗装しても、刷毛の先端ですでに塗られている塗料を掻き取ってしまうため、乾燥膜厚６０〜８０μm が限界であり、防食性能上要求される乾燥膜厚１２０μm を１回の刷毛塗りで得ることは不可能である。
【０００３】
例えば、特公平１−３７４２６号公報には、エポキシ化合物をアルカノールアミンで変性したポリヒドロキシ化合物、イソシアネート系硬化剤、芳香族系オリゴマー及び鱗片状顔料を配合してなる防食塗料が提案されているが、この防食塗料では１回の刷毛塗りで乾燥膜厚５０μm 程度の塗膜しか形成できなかった。
【０００４】
塗膜歩留りを向上させたハイソリッドタイプの塗料については、従来の防食塗料よりは乾燥膜厚を厚くすることは可能であるが、塗装時の温度の影響を受けやすく、低温時に硬化性不良などの問題がある。それゆえ、設備の補修塗装を行う場合、いずれの塗料を使用しても工程が２日以上にわたることとなり、作業期間の長期化につながっている。
【０００５】
設備稼働率や収益の向上のため、補修期間の短縮、補修費用の削減が求められている。スプレー塗装を行うと、１回の塗装で十分な膜厚を得ることは可能であるが、飛散防止のための養生が必要となり、塗料飛散による歩留り減少など補修費用削減に逆行する。また、刷毛塗りでは必要膜厚を得るには２〜３回の塗装が必要となり、工程の長期化につながる。さらに、一般的な重防食塗料は、十分な下地処理が必要であり、下地処理（ブラスト処理や機械研磨処理等）が困難な高所や狭隘部など不十分な状態での塗装では塗膜の耐久性が著しく低下する。また、十分な下地処理を行うことは、工期が長期化し補修費用の増加につながる。このように、設備補修に使用されている従来の防食塗料では、補修期間の短縮と補修費用の削減を両立させることが困難である。
【０００６】
【発明が解決しようとする課題】
本発明の目的は、補修期間の短縮と補修費用の削減を両立できる補修用塗料組成物、及びいわゆる低ケレン面（不十分な下地処理面）に１回の刷毛塗り及び／ローラー塗装で充分な耐食性をもつ塗膜を形成可能な設備補修方法を提供することにある。
【０００７】
【課題を解決するための手段】
すなわち、本発明は、塗料中に、ポリオール樹脂又はエポキシ樹脂からなる塗料樹脂（固形分）１００重量部に対し、顔料として平均粒径２０〜５００μm、アスペクト比２０以上のマイカ又はタルクからなる鱗片状顔料１５〜５０重量部、酸化チタンからなる着色顔料２０〜８０重量部及び平均吸油量１５〜４０ml／１００gの体質顔料７０〜１５０重量部（但し、顔料の合計は１０５〜２５０重量部である）と、芳香族系オリゴマー４０〜８０重量部、及び硬化剤の有効量を含有し、刷毛塗り及び／又はローラーでウェット・オン・ウェット塗装して乾燥膜厚１００〜２５０μmに塗装するための補修用塗料組成物である。本発明の補修用塗料組成物は、塗料樹脂が、ポリオール樹脂のとき硬化剤をイソシアネート系硬化剤とし、エポキシ樹脂のとき硬化剤をアミン系硬化剤とし、且つ塗料樹脂を含む主剤と硬化剤を含む液の２液型とすることがよい。
【０００８】
また、本発明は、上記の補修用塗料組成物を刷毛塗り及び／又はローラー塗装でウェット・オン・ウェット塗装し、乾燥膜厚１００〜２５０μm の塗膜を形成させることを特徴とする設備補修方法である。
【０００９】
本発明の塗料組成物に用いる塗料樹脂としては、塗料樹脂として公知のポリオール樹脂やエポキシ樹脂などが挙げられる。
【００１０】
ポリオール樹脂としては、１分子中に水酸基を２個以上有し、イソシアネート系硬化剤と反応して架橋塗膜を形成することができる水酸基当量１００〜２０００程度のポリオール樹脂であれば液状、固形を問わず使用できる。このようなポリオール樹脂としては、例えばエポキシ変性ポリオール、ポリエステルポリオール、ポリエーテルポリオール、アクリルポリオール、キレート変性ポリオール、ヒマシ油変性ポリオールなどの１種又は２種以上が挙げられる。これらのポリオール樹脂のうち、防食性の観点からエポキシ変性ポリオールが好ましく、具体的には、エポキシ当量が１８０〜２２００程度のビスフェノール型エポキシ樹脂やフェノールノボラック型エポキシ樹脂とジエタノールアミンやジイソプロパノールアミン等のアルカノールアミン類を付加反応させ得たエポキシ変性ポリオールが挙げられる。性能とコストのバランスから、ビスフェノールＡ型エポキシ樹脂とジエタノールアミン又はジイソプロパノールアミンとを付加反応させて得られたエポキシ変性ポリオールがより好ましい。
【００１１】
また、エポキシ樹脂としては、１分子中にエポキシ基を２個以上有し、アミン系硬化剤と反応して架橋塗膜を形成することができるエポキシ当量が１８０〜２２００程度のエポキシ樹脂であれば、液状樹脂、固形樹脂を問わず使用できる。このようなエポキシ樹脂としては、例えばビスフェノールＡ型エポキシ樹脂、ビスフェノールＦ型エポキシ樹脂、ビスフェノールＡＤ型エポキシ樹脂等のビスフェノール型エポキシ樹脂や、キレート変性エポキシ樹脂や、ダイマー酸変性エポキシ樹脂、プロピレンオキサイド変性エポキシ樹脂、スルフィド含有エポキシ樹脂等の特殊エポキシ樹脂などの１種又は２種以上が挙げられる。なお、無溶剤型塗料の場合は、低粘度化のため各種モノグリシジルエーテル、ジグリシジルエーテル等反応性希釈剤を併用できる。
【００１２】
本発明の塗料組成物には、防食性能を改善するため、更に芳香族系オリゴマーを配合することが好ましい。芳香族系オリゴマーとしては、数平均分子量３００〜６０００、好ましくは３００〜６００、粘度５〜２０００cp（２５℃）又は軟化点常温以下、好ましくは５〜２０cp（２５℃）、不揮発分５０重量％以上で、塗料中の他の配合成分と反応しがたいものや、その変性物などが挙げられる。このような芳香族系オリゴマーとしては、低粘度キシレン樹脂、液状クマロン樹脂、低分子量石油樹脂、イソプロペニルトルエンの液状低重合物、イソプロペニルトルエンとα−メチルスチレンとの共重合物、スチレンオリゴマー、フェノール類で変性されたクマロン樹脂、スチレンオリゴマーなどの１種又は２種以上が挙げられる。芳香族系オリゴマーの配合率は、塗料樹脂１００重量部に対し、１０〜２００重量部、好ましくは４０〜８０重量部がよい。これが１０重量部より少ないと十分な防食性向上効果が得られず、２００重量部を超えると塗膜強度が低下する。
【００１３】
本発明の塗料組成物には、顔料として、鱗片状顔料、体質顔料及び着色顔料の３種類の顔料を特定量含有させることが必要である。
【００１４】
まず、鱗片状顔料としては、例えばマイカ、鱗片状タルク、鱗片状シリカ、ＭＩＯ（雲母状酸化鉄）、ガラスフレーク、フレーク状アルミなどの１種又は２種以上が挙げられる。このうち、ＭＩＯは着色力があり、塗料の色が限定されるので好ましくない。本発明の塗料組成物に用いる鱗片状顔料は、平均粒径２０〜５００μm 、アスペクト比２０以上、好ましくは２５以上である。平均粒径が２０μm より小さいと厚膜塗装性を得ることができず、５００μm を超えると塗料の流動性が低下し、造膜性に劣り、外観が著しく低下するのみならず、塗装欠陥の発生率も上昇する。アスペクト比が２０より低いと通常の体質顔料に近づき、厚膜塗装が困難となる。鱗片状顔料の配合割合は、塗料樹脂１００重量部に対し１５〜５０重量部である。これが１５重量部より少ないと厚膜塗装が困難となり、５０重量部を超えると塗膜の揺変性が過大となり、造膜しにくくなる。
【００１５】
次に、体質顔料としては、例えばタルク、炭酸カルシウム、硫酸バリウム、カオリンクレーなどの１種又は２種以上が挙げられる。本発明においては、体質顔料の平均吸油量を１５〜４０ml／１００g に調整することが必要である。これが１５ml／１００g より少ないと平均粒径が過大となり、平滑な塗膜を形成することが困難になり、４０ml／１００g よりも多いと塗料の粘度が上昇し、塗装性が著しく低下する。体質顔料の配合割合は、塗料樹脂１００重量部に対し７０〜１５０重量部である。
【００１６】
また、着色顔料としては、酸化チタン等の公知の有機又は無機着色顔料を使用することができ、塗料を希望の色調とするには、塗料樹脂１００重量部に対し２０〜８０重量部が必要である。そして、鱗片状顔料、体質顔料及び着色顔料の合計は、塗料樹脂１００重量部に対し１００〜２５０重量部、好ましくは１４０〜２００重量部である。ところで、顔料が、鱗片状顔料、体質顔料及び着色顔料のいずれか２以上に該当する場合は、鱗片状顔料、着色顔料次いで体質顔料の順に優先させる。
【００１７】
本発明の塗料組成物に用いる硬化剤としては、塗料樹脂がポリオール樹脂の場合は、イソシアネート系硬化剤、塗料樹脂がエポキシ樹脂の場合は、アミン系硬化剤を用いるのがよい。
【００１８】
イソシアネート系硬化剤は、イソシアネート基を１分子中に２個以上有する化合物であればよく、汎用型、難黄変型（紫外線暴露下での変色性）、無黄変型（紫外線暴露下での変色性）などを用いることができる。まず、汎用型としては、トリレンジイソシアネート（ＴＤＩと略称する）、ＴＤＩの３量化物であるイソシアヌレート、４，４’−ジフェニルジフェニルメタンジイソシアネート（ＭＤＩと略称する）、ポリメリックジフェニルメタンジイソシアネート（ポリメリックＭＤＩと略称する）などが挙げられる。また、難黄変型としては、キシリレンジイソシアネート（ＸＤＩと略称する）が挙げられる。更に無黄変型としては、ヘキサメチレンジイソシアネート（ＨＤＩと略称する）、イソホロンジイソシアネート、水添ＸＤＩ及び水添ＭＤＩ等が挙げられ、さらに上記イソシアネート類をトリメチロールプロパン（ＴＭＰと略称する）等の多価アルコール、多価フェノール類で変性したアダクトも使用できる。これらのうち、コストと性能のバランスの点から、ＴＤＩのＴＭＰアダクト物及びポリメリックＭＤＩが好ましい。イソシアネート硬化剤の使用量は、イソソアネート基／ポリオール樹脂のヒドロキシル基のモル比で０．３〜１．５、好ましくは０．５〜１．０がよい。
【００１９】
また、アミン系硬化剤としては、例えばポリアミド系硬化剤や、脂肪族若しくは芳香族アミン、又はこれらのマンニッヒ変性、アダクト変性等の変性アミン、ケチミン系硬化剤などの１種又は２種以上が挙げられる。アミン系硬化剤の使用量は、アミン／エポキシ当量で０．５〜１．５、好ましくは０．５〜１．０がよい。これが０．５より少ないと硬化不良のため良好な硬化塗膜を得ることができず、１．５より多いと塗膜表面が白化したり、耐水性が低下する。
【００２０】
本発明の塗料組成物には、上記必須成分の他に、例えば顔料分散剤、消泡剤、レベリング剤、揺変剤（タレ止め剤）、脱水剤等の各種添加剤を配合することができる。揺変剤は、塗装１回当たりの膜厚を大きくし、塗膜のタレを小さくし、更に塗装中の粘度を小さくし作業性を高める目的で添加されるものであり、具体的には酸化ポリエチレンワックス、脂肪酸アミドワックス、有機ベントナイトなどが挙げられる。脱水剤としては、例えばゼオライトなどが挙げられる。これら各種添加剤のうち、揺変剤及び脱水剤を配合すると塗膜性能が向上するので好ましい。また、溶剤としては、例えばトルエン、キシレン等の芳香族系溶剤、メチルエチルケトン、メチルイソブチルケトン等のケトン系溶剤、酢酸エチル、酢酸ブチル等の脂肪族エステル系溶剤、あるいはこれらの混合溶剤などを適宜使用できる。溶剤は、主剤１００重量部に対し１〜５００重量部程度配合するとよい。さらに、塗料組成物の粘度や硬化塗膜の物性を調整するため単官能アルコール類を希釈剤として用いることもできる。
【００２１】
本発明の補修用塗料組成物は、主剤と硬化剤の２液として調製・保存し、使用前に混合すればよい。すなわち、塗料樹脂、顔料、溶剤及び各種添加剤をディスパー、ボールミル等により所定割合で混合分散して主剤液を調製し、硬化剤に溶剤を加えて硬化剤液を調製する。なお、本発明の２液型補修用塗料組成物は、２液とされた塗料組成物及びこれを混合した塗料組成物の両者を含む。
【００２２】
本発明の補修用塗料組成物は、使用時に主剤液と硬化剤液を所定割合に撹袢混合し、被塗物に刷毛塗り及び／又はローラー塗装によりウェット・オン・ウェット塗装し、硬化させることにより、乾燥膜厚み約１００〜２５０μm 程度の塗膜を形成することができる。このように、１回の塗装（ウェット・オン・ウェットでの数回塗り）で乾燥膜厚み約１００〜２５０μm 程度の強固な塗膜を形成することができ、短工期、低ケレン、わずかの養生での補修塗装が可能となり、設備保全の費用を削減することが可能となる。
【００２３】
【実施例】
以下の実施例及び比較例で用いた薬剤は次のとおりである。
アデカレジンEP-6021：エポキシポリオール 旭電化工業（株）製 固形分６０％ 水酸基当量４５０g ／当量
エポトートYD-011-75X：ビスフェノールＡ型エポキシ樹脂 東都化成（株）製 固形分７５％ エポキシ当量４７５
コロネートL：TDI／TMPアダクト 日本ポリウレタン（株）製
サンマイド305-70：ポリアミドアミン 三和化学（株）製
ニカノールLLL：キシレン樹脂 三菱瓦斯化学（株）製 平均分子量（Ｍｎ）３３０〜３５０
タルクSC25：富士タルク工業（株）製 吸油量１５ml／１００g
タルクPK50：富士タルク工業（株）製 吸油量３０ml／１００g
タルクPKS：富士タルク工業（株）製 吸油量４４ml／１００g
タルクMK48：富士タルク工業（株）製 鱗片状タルク アスペクト比２５
SL100：竹原化学（株）製 平均粒径６μm 、吸油量２３ml／１００g
マイカ30C：（株）クラレ製 平均粒径６８０μm 、アスペクト比９０
マイカ80C：（株）クラレ製 平均粒径２３０μm 、アスペクト比６５
マイカ200C：（株）クラレ製 平均粒径８０μm 、アスペクト比４５
マイカ400W：（株）クラレ製 平均粒径１８μm 、アスペクト比３５
【００２４】
実施例１〜５、比較例１〜１０
塗料樹脂、硬化剤、芳香族オリゴマー、顔料（着色顔料、体質顔料、鱗片状顔料）、添加剤及び溶剤を表１（実施例１〜５）、表２（比較例１〜５）及び表３（比較例６〜１０）に示す割合で配合し、これらをボールミルにより分散混合して主剤液と硬化剤液の２液よりなる塗料組成物を調製した。調合した体質顔料の平均吸油量 (ml／１００g)を表１、表２及び表３に示す。
【００２５】
表１、表２及び表３に示す主剤液と硬化剤液を充分に混合した後、エナメル刷毛と中毛の羽毛ローラーを用いて、垂直に立てかけた亜鉛メッキ鋼板にウェット・オン・ウェット塗布し、最大付着量を測定した。また、この塗料を乾燥膜厚が２００μm になるように錆鋼板に塗装し、耐食性の促進試験（塩水噴霧試験、複合サイクル試験）を行った。試験結果を表４（実施例１〜５）、表５（比較例１〜５）及び表６（比較例６〜１０）に示す。
なお、錆鋼板は、ブラスト処理した軟鉄板を土に触れないようコンクリート上に立てかけ、２年間屋外で暴露し、発錆させた後、マジックロンで表面の汚れと浮き錆のみを除いたものを使用した。これは実際の設備の補修に際し、低ケレンとなることを想定したものである。
【００２６】
塗装性の評価基準及び耐食性の促進試験方法は次のとおりである。
塗装性評価基準
○ ： 刷毛さばきがなめらかで良好な外観の塗板ができる。
○〜△： 刷毛さばきがやや重い。塗板の外観は良好。
△ ： 刷毛さばきが重く、刷毛目が残る。
△〜×： 刷毛さばきが非常に重く、平滑な塗板ができない。
× ： 塗装不可能
塩水噴霧試験
ＪＩＳ Ｋ５４００（９．２）に準ずる。
複合サイクル試験
日産サイクル（人工海水）法を使用した。
【００２７】
【表１】
【表２】
【表３】
【表４】
【表５】
【表６】
【発明の効果】
本発明によれば、刷毛塗りなどで防食上必要充分な膜厚の塗膜を１回の塗装（ウェット・オン・ウェットでの数回塗り）で形成することができ、さらに低ケレン面での優れた防食性を得ることができる。これにより、設備補修を短工期、低コストで行うことが可能となった。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a coating composition for repairing iron structures, ships, steel pipes, and the like, and a facility repairing method using the same.
[0002]
[Prior art]
Conventional anti-corrosion paints can be added with thixotropic agents to increase the sagging limit. However, when painting with a brush, the tip of the brush can be applied even if it is painted again on an uncured coating. Therefore, the dry film thickness of 60 to 80 μm is the limit, and it is impossible to obtain a dry film thickness of 120 μm required for anticorrosion performance by one brush application.
[0003]
For example, Japanese Patent Publication No. 1-37426 proposes an anticorrosion paint comprising a polyhydroxy compound obtained by modifying an epoxy compound with an alkanolamine, an isocyanate curing agent, an aromatic oligomer and a scaly pigment. With this anticorrosion paint, only a coating film having a dry film thickness of about 50 μm could be formed by one brush application.
[0004]
For high solid type paints with improved coating film yield, it is possible to make the dry film thickness thicker than conventional anti-corrosion paints, but they are more susceptible to temperature during painting, such as poor curability at low temperatures. There is a problem. Therefore, when performing repair painting of equipment, the process takes more than two days regardless of which paint is used, leading to a prolonged work period.
[0005]
Shortening the repair period and reducing repair costs are required to improve the capacity utilization rate and profits. When spray coating is performed, it is possible to obtain a sufficient film thickness with a single coating, but curing is required to prevent scattering, which goes against reducing repair costs such as a decrease in yield due to paint scattering. Moreover, in brush coating, in order to obtain a required film thickness, the coating of 2 to 3 times is required, leading to a prolonged process. Furthermore, general heavy duty anticorrosion paints require sufficient surface treatment, and the coating of the paint film is insufficient when painting in insufficient places such as high places and narrow spaces where ground treatment (blasting, mechanical polishing, etc.) is difficult. Durability is significantly reduced. In addition, sufficient surface treatment results in a longer construction period and increased repair costs. Thus, it is difficult for the conventional anticorrosive paint used for equipment repair to achieve both reduction of the repair period and reduction of the repair cost.
[0006]
[Problems to be solved by the invention]
An object of the present invention is to provide a coating composition for repair that can achieve both shortening of the repair period and reduction of repair cost, and sufficient brush and / or roller coating on a so-called low-keren surface (insufficient ground surface). An object of the present invention is to provide an equipment repair method capable of forming a coating film having corrosion resistance.
[0007]
[Means for Solving the Problems]
That is, the present invention is a scale-like substance made of mica or talc having an average particle diameter of 20 to 500 μm and an aspect ratio of 20 or more as a pigment with respect to 100 parts by weight of a paint resin (solid content) made of a polyol resin or an epoxy resin. 15 to 50 parts by weight of pigment, 20 to 80 parts by weight of color pigment made of titanium oxide, and 70 to 150 parts by weight of extender pigment having an average oil absorption of 15 to 40 ml / 100 g (however, the total amount of pigments is 105 to 250 parts by weight) And 40 to 80 parts by weight of an aromatic oligomer, and an effective amount of a curing agent , and for repairing to apply a wet-on-wet coating with a brush and / or roller to a dry film thickness of 100 to 250 μm It is a coating composition . The coating composition for repair according to the present invention comprises a curing agent as an isocyanate curing agent when the coating resin is a polyol resin, an amine curing agent as an epoxy resin, and a main agent and a curing agent containing the coating resin. It is good to use the 2 liquid type of the liquid to contain.
[0008]
In addition, the present invention provides a repair method for equipment, characterized in that the above-described repair coating composition is wet-on-wet-painted by brushing and / or roller coating to form a coating film having a dry film thickness of 100 to 250 μm. It is.
[0009]
Examples of the coating resin used in the coating composition of the present invention include known polyol resins and epoxy resins as coating resins.
[0010]
The polyol resin has two or more hydroxyl groups in one molecule and can be liquid or solid as long as the polyol resin has a hydroxyl group equivalent of about 100 to 2,000 which can react with an isocyanate curing agent to form a crosslinked coating film. Can be used regardless. Examples of such a polyol resin include one or more of epoxy-modified polyol, polyester polyol, polyether polyol, acrylic polyol, chelate-modified polyol, castor oil-modified polyol, and the like. Among these polyol resins, an epoxy-modified polyol is preferable from the viewpoint of anticorrosion, and specifically, bisphenol type epoxy resin or phenol novolac type epoxy resin having an epoxy equivalent of about 180 to 2200 and alkanol such as diethanolamine or diisopropanolamine. An epoxy-modified polyol obtained by addition reaction of amines can be mentioned. From the balance between performance and cost, an epoxy-modified polyol obtained by addition reaction of a bisphenol A type epoxy resin and diethanolamine or diisopropanolamine is more preferable.
[0011]
Moreover, as an epoxy resin, if it is an epoxy resin which has two or more epoxy groups in 1 molecule, and the epoxy equivalent which can react with an amine hardening | curing agent and can form a crosslinked coating film is about 180-2200, Any liquid resin or solid resin can be used. Examples of such epoxy resins include bisphenol type epoxy resins such as bisphenol A type epoxy resins, bisphenol F type epoxy resins, and bisphenol AD type epoxy resins, chelate modified epoxy resins, dimer acid modified epoxy resins, and propylene oxide modified epoxy resins. 1 type, or 2 or more types, such as resin and special epoxy resins, such as a sulfide containing epoxy resin, are mentioned. In the case of a solvent-free paint, reactive diluents such as various monoglycidyl ethers and diglycidyl ethers can be used in combination for reducing the viscosity.
[0012]
In order to improve the anticorrosion performance, the coating composition of the present invention preferably further contains an aromatic oligomer. As the aromatic oligomer, the number average molecular weight is 300 to 6000, preferably 300 to 600, the viscosity is 5 to 2000 cp (25 ° C.) or the softening point is normal temperature or less, preferably 5 to 20 cp (25 ° C.), and the nonvolatile content is 50% by weight or more. And those which are difficult to react with other compounding components in the paint, and modified products thereof. Examples of such aromatic oligomers include low viscosity xylene resin, liquid coumarone resin, low molecular weight petroleum resin, liquid low polymer of isopropenyl toluene, copolymer of isopropenyl toluene and α-methylstyrene, styrene oligomer, One type or two or more types of coumarone resins modified with phenols, styrene oligomers and the like can be mentioned. The blending ratio of the aromatic oligomer is 10 to 200 parts by weight, preferably 40 to 80 parts by weight with respect to 100 parts by weight of the coating resin. If the amount is less than 10 parts by weight, a sufficient effect of improving corrosion resistance cannot be obtained, and if it exceeds 200 parts by weight, the coating strength is lowered.
[0013]
The coating composition of the present invention needs to contain a specific amount of three kinds of pigments, scaly pigments, extender pigments and colored pigments, as pigments.
[0014]
First, examples of the scaly pigment include one kind or two or more kinds such as mica, scaly talc, scaly silica, MIO (mica-like iron oxide), glass flakes, and flake-like aluminum. Among these, MIO is not preferable because it has coloring power and the color of the paint is limited. The scaly pigment used in the coating composition of the present invention has an average particle size of 20 to 500 μm and an aspect ratio of 20 or more, preferably 25 or more. If the average particle size is less than 20 μm, thick film paintability cannot be obtained, and if it exceeds 500 μm, the fluidity of the paint is lowered, the film-forming property is inferior, the appearance is remarkably lowered, and coating defects are generated. The rate will also rise. If the aspect ratio is lower than 20, it approaches a normal extender pigment, and thick film coating becomes difficult. The blending ratio of the scale-like pigment is 15 to 50 parts by weight with respect to 100 parts by weight of the coating resin. When the amount is less than 15 parts by weight, thick film coating becomes difficult, and when the amount exceeds 50 parts by weight, the thixotropic property of the coating film becomes excessive and film formation becomes difficult.
[0015]
Next, examples of extender pigments include one or more of talc, calcium carbonate, barium sulfate, kaolin clay, and the like. In the present invention, it is necessary to adjust the average oil absorption of the extender pigment to 15 to 40 ml / 100 g. When the amount is less than 15 ml / 100 g, the average particle size becomes excessive, and it becomes difficult to form a smooth coating film. When the amount is more than 40 ml / 100 g, the viscosity of the paint increases and the paintability is remarkably lowered. The blending ratio of the extender pigment is 70 to 150 parts by weight with respect to 100 parts by weight of the coating resin.
[0016]
Further, as the coloring pigment, a known organic or inorganic coloring pigment such as titanium oxide can be used, and 20 to 80 parts by weight is required with respect to 100 parts by weight of the coating resin in order to make the coating have a desired color tone. is there. And the sum total of a scale-like pigment, an extender pigment, and a coloring pigment is 100-250 weight part with respect to 100 weight part of coating resin, Preferably it is 140-200 weight part. By the way, when a pigment corresponds to any two or more of scaly pigments, extender pigments, and colored pigments, priority is given to scaly pigments, colored pigments, and extender pigments in this order.
[0017]
As the curing agent used in the coating composition of the present invention, it is preferable to use an isocyanate curing agent when the coating resin is a polyol resin, and an amine curing agent when the coating resin is an epoxy resin.
[0018]
The isocyanate curing agent may be a compound having two or more isocyanate groups in one molecule, and is a general-purpose type, a hardly yellowing type (discoloring property under UV exposure), or a non-yellowing type (discoloring property under UV exposure). ) Etc. can be used. First, general-purpose types include tolylene diisocyanate (abbreviated as TDI), isocyanurate which is a trimerized product of TDI, 4,4'-diphenyldiphenylmethane diisocyanate (abbreviated as MDI), and polymeric diphenylmethane diisocyanate (abbreviated as polymeric MDI). )). Moreover, xylylene diisocyanate (abbreviated as XDI) is mentioned as the hardly yellowing type. Further, examples of the non-yellowing type include hexamethylene diisocyanate (abbreviated as HDI), isophorone diisocyanate, hydrogenated XDI, and hydrogenated MDI. Further, the isocyanates may be polyvalent such as trimethylolpropane (abbreviated as TMP). Adducts modified with alcohol or polyphenols can also be used. Of these, TDI TMP adducts and polymeric MDI are preferred from the standpoint of balance between cost and performance. The amount of the isocyanate curing agent used is 0.3 to 1.5, preferably 0.5 to 1.0 in terms of a molar ratio of isocyanato group / polyol resin hydroxyl group.
[0019]
Examples of the amine curing agent include one or more of a polyamide curing agent, an aliphatic or aromatic amine, a modified amine such as Mannich modification or adduct modification, a ketimine curing agent, or the like. It is done. The used amount of the amine curing agent is 0.5 to 1.5, preferably 0.5 to 1.0 in terms of amine / epoxy equivalent. When this is less than 0.5, a cured film cannot be obtained because of poor curing, and when it is more than 1.5, the coating surface is whitened or the water resistance is lowered.
[0020]
In addition to the above essential components, the coating composition of the present invention may contain various additives such as a pigment dispersant, an antifoaming agent, a leveling agent, a thixotropic agent (sagging agent), and a dehydrating agent. . The thixotropic agent is added for the purpose of increasing the film thickness per coating, reducing the sagging of the coating film, reducing the viscosity during coating, and improving workability. Examples thereof include polyethylene wax, fatty acid amide wax, and organic bentonite. Examples of the dehydrating agent include zeolite. Of these various additives, blending a thixotropic agent and a dehydrating agent is preferable because the coating film performance is improved. As the solvent, for example, an aromatic solvent such as toluene or xylene, a ketone solvent such as methyl ethyl ketone or methyl isobutyl ketone, an aliphatic ester solvent such as ethyl acetate or butyl acetate, or a mixed solvent thereof is appropriately used. it can. About 1 to 500 parts by weight of the solvent may be added to 100 parts by weight of the main agent. Furthermore, monofunctional alcohols can also be used as diluents to adjust the viscosity of the coating composition and the physical properties of the cured coating film.
[0021]
The repair coating composition of the present invention may be prepared and stored as two liquids, a main agent and a curing agent, and mixed before use. That is, a coating resin, a pigment, a solvent, and various additives are mixed and dispersed at a predetermined ratio by a disper, a ball mill, or the like to prepare a main agent liquid, and a solvent is added to the curing agent to prepare a curing agent liquid. The two-component repair coating composition of the present invention includes both a two-component coating composition and a coating composition obtained by mixing the coating composition.
[0022]
The repair coating composition of the present invention is prepared by stirring and mixing the main agent liquid and the curing agent liquid in a predetermined ratio at the time of use, and applying the paint on the object to be coated by brush-on and / or roller-coating and curing. Thus, a coating film having a dry film thickness of about 100 to 250 μm can be formed. Thus, it is possible to form a strong coating film with a dry film thickness of about 100 to 250 μm by one coating (wet-on-wet coating several times). This makes it possible to reduce the cost of equipment maintenance.
[0023]
【Example】
The chemical | medical agent used by the following example and the comparative example is as follows.
Adeka Resin EP-6021: Epoxy polyol Asahi Denka Kogyo Co., Ltd. Solid content 60% Hydroxyl equivalent 450g / Equivalent Epototo YD-011-75X: Bisphenol A type epoxy resin Solid content 75% Epoxy equivalent 475
Coronate L: TDI / TMP adduct Nippon Polyurethane Co., Ltd. Sanmide 305-70: Polyamidoamine Sanwa Chemical Co., Ltd. Nikanol LLL: Xylene Resin Mitsubishi Gas Chemical Co., Ltd. Average Molecular Weight (Mn) 330-350
Talc SC25: Fuji Talc Kogyo Co., Ltd. Oil absorption 15ml / 100g
Talc PK50: Fuji Talc Kogyo Co., Ltd. Oil absorption 30ml / 100g
Talc PKS: Fuji Talc Kogyo Co., Ltd. Oil absorption 44ml / 100g
Talc MK48: Fuji Talc Kogyo Co., Ltd. Scale Talc Aspect Ratio 25
SL100: Takehara Chemical Co., Ltd. average particle size 6μm, oil absorption 23ml / 100g
Mica 30C: Kuraray Co., Ltd. average particle size 680 μm, aspect ratio 90
Mica 80C: Kuraray Co., Ltd. average particle size 230 μm, aspect ratio 65
Mica 200C: Kuraray Co., Ltd. average particle size 80μm, aspect ratio 45
Mica 400W: Kuraray Co., Ltd. average particle size 18μm, aspect ratio 35
[0024]
Examples 1-5, Comparative Examples 1-10
Table 1 (Examples 1 to 5), Table 2 (Comparative Examples 1 to 5), and Table 3 are paint resins, curing agents, aromatic oligomers, pigments (colored pigments, extender pigments, scaly pigments), additives, and solvents. They were blended in the proportions shown in (Comparative Examples 6 to 10), and these were dispersed and mixed by a ball mill to prepare a coating composition comprising two liquids of a main agent liquid and a curing agent liquid. Tables 1, 2, and 3 show the average oil absorption (ml / 100 g) of the prepared extender pigments.
[0025]
After thoroughly mixing the main agent solution and curing agent solution shown in Table 1, Table 2 and Table 3, apply wet-on-wet to the vertically galvanized steel sheet using enamel brush and medium-feather feather roller. The maximum adhesion amount was measured. Further, this paint was applied to a rust steel sheet so that the dry film thickness was 200 μm, and an accelerated corrosion resistance test (a salt spray test, a combined cycle test) was performed. The test results are shown in Table 4 (Examples 1 to 5), Table 5 (Comparative Examples 1 to 5) and Table 6 (Comparative Examples 6 to 10).
The rusted steel plate is a blasted soft iron plate that stands on the concrete so that it does not touch the soil, and is exposed outdoors for 2 years, then rusted, and then only the surface dirt and floating rust are removed with Magiclon. used. This is based on the assumption that the actual equipment will be low-keren.
[0026]
The evaluation criteria for paintability and the accelerated test method for corrosion resistance are as follows.
Paintability evaluation standard ○: A brush with a smooth brush and a good appearance can be obtained.
○ to △: Brush judgment is slightly heavy. Appearance of coated plate is good.
Δ: Brush handling is heavy and brush eyes remain.
Δ to ×: Brush handling is very heavy and a smooth coated plate cannot be formed.
X: According to JIS K5400 (9.2), a non-paintable salt spray test.
The combined cycle test Nissan cycle (artificial seawater) method was used.
[0027]
[Table 1]
[Table 2]
[Table 3]
[Table 4]
[Table 5]
[Table 6]
【The invention's effect】
According to the present invention, it is possible to form a coating film having a sufficient film thickness necessary for anticorrosion by brush coating or the like by one coating (coating several times with wet-on-wet), and further with a low keren surface. Excellent anticorrosion properties can be obtained. This makes it possible to repair the equipment at a short construction period and at a low cost.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31855199A JP4610686B2 (en) | 1999-11-09 | 1999-11-09 | Repair coating composition and equipment repair method |
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|---|---|---|---|
| JP31855199A JP4610686B2 (en) | 1999-11-09 | 1999-11-09 | Repair coating composition and equipment repair method |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2010181612A Division JP5153838B2 (en) | 2010-08-16 | 2010-08-16 | Equipment repair method using paint capable of thick film coating |
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| JP2001131468A JP2001131468A (en) | 2001-05-15 |
| JP4610686B2 true JP4610686B2 (en) | 2011-01-12 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| JP4082597B2 (en) | 2003-07-11 | 2008-04-30 | 本田技研工業株式会社 | Fuel cell vehicle |
| DE10394358T5 (en) * | 2003-12-29 | 2007-01-25 | Council Of Scientific & Industrial Research | Inexpensive, alternative oxygen barrier material for the packaging industry |
| JP5712056B2 (en) * | 2011-06-02 | 2015-05-07 | 日塗化学株式会社 | Sealing treatment agent for room temperature sprayed coating and sealing treatment method for room temperature sprayed coating |
| JP6411121B2 (en) * | 2014-08-04 | 2018-10-24 | 日塗化学株式会社 | Repair painting method for steel structures |
| CN104403509A (en) * | 2014-12-29 | 2015-03-11 | 苏州奥莱鑫建材有限公司 | Antiskid-paint-coated floor |
| JP2016186021A (en) * | 2015-03-27 | 2016-10-27 | 大日本塗料株式会社 | Aqueous epoxy resin coating composition, coated body and method for producing coated body |
| CN115286970B (en) * | 2022-06-23 | 2023-06-30 | 南京长江涂料有限公司 | Solvent-free wet-on-wet construction epoxy anti-corrosion primer and preparation method thereof |
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| JPS59228978A (en) * | 1983-06-10 | 1984-12-22 | Suriibondo:Kk | Method for sealing and corrosion-preventing inside surface in broken part of buried conduit or the like |
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| JPH0137426B2 (en) * | 1985-12-05 | 1989-08-07 | Shinnitsutetsu Kagaku Kk | |
| JPH0251572A (en) * | 1988-08-16 | 1990-02-21 | Nichirin Rubber Kogyo Kk | Coating composition and water-resistant coating film |
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| JPS58137471A (en) * | 1982-02-09 | 1983-08-15 | Asahi Glass Co Ltd | Method of finishing repairing coating on old paint film |
| JPS61192372A (en) * | 1985-02-21 | 1986-08-26 | Nippon Steel Corp | Method for submerged painting of steel structure |
| JPS62106970A (en) * | 1985-11-01 | 1987-05-18 | Aisin Chem Co Ltd | Water-based coating composition |
| JPS62158152A (en) * | 1985-12-30 | 1987-07-14 | 武居 二郎 | Composition for protective coating |
| JPH07103353B2 (en) * | 1990-05-22 | 1995-11-08 | 石油公団 | Repair coating method for offshore steel structure |
| JPH07172886A (en) * | 1993-12-21 | 1995-07-11 | Kikusui Kagaku Kogyo Kk | Highly kneadable composition |
| JP3370213B2 (en) * | 1994-12-16 | 2003-01-27 | 関西ペイント株式会社 | One-part type epoxy resin composition, one-part type anticorrosion coating composition, and coating method using the same |
| JP3614516B2 (en) * | 1995-06-28 | 2005-01-26 | 大日本インキ化学工業株式会社 | Epoxy resin composition |
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|---|---|---|---|---|
| JPS59228978A (en) * | 1983-06-10 | 1984-12-22 | Suriibondo:Kk | Method for sealing and corrosion-preventing inside surface in broken part of buried conduit or the like |
| JPH0137426B2 (en) * | 1985-12-05 | 1989-08-07 | Shinnitsutetsu Kagaku Kk | |
| JPH01170670A (en) * | 1987-12-25 | 1989-07-05 | Kawatetsu Techno Res Corp | Heavy corrosion-resistant composition |
| JPH0251572A (en) * | 1988-08-16 | 1990-02-21 | Nichirin Rubber Kogyo Kk | Coating composition and water-resistant coating film |
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