JP2013047377A - Surface-treated weatherproof steel stock - Google Patents
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Abstract
Description
本発明は、橋梁などの鋼材として用いられるさび安定化処理がなされた鋼材に関する。詳しくは、保護性さび形成過程での流れさび等による外観不良がない表面処理耐候性鋼材に関するものである。 The present invention relates to a steel material that has been subjected to rust stabilization treatment and used as a steel material such as a bridge. More specifically, the present invention relates to a surface-treated weathering steel material having no appearance defect due to flow rust or the like in the process of forming a protective rust.
耐候性鋼は、Ｃｕ、Ｎｉ、Ｃｒ、Ｐ、Ｍｏ等の元素が少量含有された低合金鋼であって、大気中に暴露すると、腐食し発さびする過程で保護性の高いさび層（保護性さび）が自然に形成される。そして、前記さび層が形成された後はそれ以降の鋼材の腐食速度は低下し、最終的には腐食が殆ど進行しない特性を持つ鋼材となる。 Weatherproof steel is a low-alloy steel containing a small amount of elements such as Cu, Ni, Cr, P, and Mo. When exposed to the atmosphere, it has a highly protective rust layer (corrosion protection). Natural rust) is formed naturally. And after the said rust layer is formed, the corrosion rate of the steel material after it falls, and finally it becomes a steel material with the characteristic that corrosion hardly progresses.
このような耐候性鋼材は、形鋼、鋼板、鋼管等各種鋼材に適用され、橋梁や鉄塔等の構造物として幅広い用途があるが、次のような問題を有していた。
すなわち、耐候性鋼材を裸使用する場合、鋼材表面に保護性の高いさびが形成されるまで５年以上の長期間を要し、その間、浮きさびや流れさびを生じ、流出したさび汁により周囲環境を汚染し、外観を損なう問題があった。
Such a weather-resistant steel material is applied to various steel materials such as a shape steel, a steel plate, and a steel pipe, and has a wide range of uses as a structure such as a bridge and a steel tower, but has the following problems.
In other words, when weatherproof steel is used barely, it takes a long period of 5 years or more until a highly protective rust is formed on the surface of the steel. There was a problem of polluting the environment and deteriorating the appearance.
これに対して、耐候性鋼の表面にさび安定化処理と称される表面処理を行い、上記の問題を解決した鋼材に関する技術が開示されている。
例えば、特許文献１には、鉄イオンに対し捕捉沈着作用を有する塩を含み、マイナスの固定電荷を持つ樹脂組成物の硬化皮膜が表面に形成された鋼材であって、硬化皮膜の40℃における水蒸気透過率が10〜1000g/m 2 ・dayであることを特徴とするさび安定化処理鋼材が開示されている。
特許文献２には、基体樹脂に、アニオン性官能基を有する化合物と、共役二重結合を有する化合物と、光崩壊性官能基を有する化合物を配合した樹脂組成物と、鉄イオンに対し捕捉沈着作用を有する塩からなるさび安定化処理剤が開示されている。
また、特許文献１、特許文献２いずれも着色顔料として暗褐色の鉄黒／ベンガラが用いられている。
また、特許文献３には、仕上げ用塗料を使用することにより、景観性を付与することが可能な低合金鋼の塗装方法が開示されている。
特許文献４には、下層塗膜と任意の色調を有する上層塗膜とからなる水蒸気透過率が１０〜１０００ｇ／ｍ2・ｄａｙである表面処理耐候性鋼の防食方法が開示されている。
On the other hand, the technique regarding the steel materials which performed the surface treatment called a rust stabilization process on the surface of weathering steel, and solved said problem is disclosed.
For example, Patent Document 1 discloses a steel material that includes a salt having a trapping and depositing action on iron ions and has a cured film of a resin composition having a negative fixed charge formed on the surface thereof. A rust-stabilized steel material having a water vapor permeability of 10 to 1000 g / m 2 · day is disclosed.
Patent Document 2 discloses a resin composition in which a base resin is compounded with a compound having an anionic functional group, a compound having a conjugated double bond, and a compound having a photodegradable functional group, and trapped and deposited on iron ions. A rust stabilizing agent comprising a salt having an action is disclosed.
In both Patent Document 1 and Patent Document 2, dark brown iron black / bengala is used as a coloring pigment.
Patent Document 3 discloses a coating method of low alloy steel that can impart a landscape by using a finish paint.
Patent Document 4 discloses a corrosion prevention method for surface-treated weathering steel having a water vapor transmission rate of 10 to 1000 g / m 2 · day composed of a lower layer coating and an upper layer coating having an arbitrary color tone.
しかしながら、さび安定化処理では、塗膜自体は徐々に保護性さびへと置換していくことから、塗膜の色調は基本的に浮きさびや流れさびを含む保護性さびと同系統の暗褐色に限定されるため、特許文献１、２では、橋梁としての景観性に劣るという問題があった。このような同系統の暗褐色でさび安定化処理された表面処理耐候性鋼材は、特に都市部では適用が難しい。
特許文献３、４は、耐候性鋼を用いた任意の着色が可能な表面処理方法ではあるが、いずれもさび安定化処理機能を有する下層塗膜の上層に別の着色層を形成させるものであり、２度以上の塗装工程を有することから、コスト高とならざるを得ないという課題がある。
However, in the rust stabilization treatment, the coating itself is gradually replaced with protective rust, so the color of the coating is basically dark brown of the same line as the protective rust including floating rust and flow rust. Therefore, in Patent Documents 1 and 2, there is a problem that the scenery as a bridge is inferior. Such a surface-treated weathering steel material that is dark brown and rust-stabilized in the same system is difficult to apply, particularly in urban areas.
Patent Documents 3 and 4 are surface treatment methods capable of arbitrary coloration using weathering steel, but all form another colored layer on the upper layer of the lower layer coating film having a rust stabilization treatment function. There is a problem that it is inevitably expensive because it has two or more coating steps.
本発明は、かかる事情に鑑みてなされたものであって、景観にあった任意の色調（着色）を可能とする表面処理耐候性鋼材を提供することを目的とする。 This invention is made | formed in view of this situation, Comprising: It aims at providing the surface treatment weather-resistant steel material which enables the arbitrary color tones (coloring) which suited the scenery.
上記課題を解決するために、鋭意研究を行った結果、以下の知見を得た。
水酸基価を５０〜７００ｍｇＫＯＨ／ｇに規定することで、鋼材表面に保護性の高いさびが形成されるまでの間、浮きさびや流れさびを生じるのをできるだけ防止する、すなわち、浮きさびや流れさびの発生時間をできるだけ遅らせることが可能となる。その結果、保護性さびと同系統の暗褐色に限定することなく景観にあった任意の色調（着色）を可能とする。所定の比率の顔料を有することで、塗膜の密着性が向上し、２度以上の塗装工程を経ることなく、経済性のある１層処理で行うことが可能となる。
As a result of earnest research to solve the above problems, the following knowledge was obtained.
By limiting the hydroxyl value to 50 to 700 mgKOH / g, it is possible to prevent floating rust and flow rust as much as possible until a highly protective rust is formed on the steel surface, that is, floating rust and flow rust. Can be delayed as much as possible. As a result, any color tone (coloring) suitable for the landscape is possible without being limited to the dark brown of the same system as the protective rust. By having the pigment in a predetermined ratio, the adhesion of the coating film is improved, and it is possible to carry out the economical one-layer process without going through two or more coating steps.
本発明は上記知見に基づくものであり、特徴は以下の通りである。
［１］表面に任意の色調を有する塗膜が形成された表面処理耐候性鋼材であり、前記塗膜は、水蒸気透過率が１０〜１０００ｇ／ｍ2・ｄａｙ、水酸基価が５０〜７００ｍｇＫＯＨ／ｇの樹脂からなり、膜厚が３０〜９０μｍであり、かつ、亜鉛を３〜３０質量％含有し、基体樹脂にアニオン性官能基を有する化合物を配合した樹脂組成物を含有し、固形分あたりの比率が重量比で３０〜８０質量％である顔料を含むことを特徴とする表面処理耐候性鋼材である。
［２］さらに、前記塗膜は、鉄イオンに対し捕捉沈着作用を有するアニオンと対カチオンとからなる少なくとも１種の塩を含有することを特徴とする前記［１］に記載の表面処理耐候性鋼材である。
The present invention is based on the above findings, and features are as follows.
[1] A surface-treated weathering steel material having a coating film having an arbitrary color tone formed on the surface, the coating film having a water vapor transmission rate of 10 to 1000 g / m 2 · day, and a hydroxyl value of 50 to 700 mgKOH / g A resin composition in which the film thickness is 30 to 90 μm, zinc is contained in an amount of 3 to 30% by mass, and the base resin is compounded with a compound having an anionic functional group. A surface-treated weathering steel material comprising a pigment having a ratio of 30 to 80% by weight.
[2] The surface treatment weather resistance according to [1], wherein the coating film further contains at least one salt composed of an anion having a trapping and depositing action on iron ions and a counter cation. It is a steel material.
本発明によれば、景観にあった任意の色調（着色）を可能にする。そして、本発明の表面処理耐候性鋼材は１層の塗膜が形成されているため、経済的である。
客先の要望に応じて任意の着色が可能で、かつ耐候性鋼由来の保護性さびの形成により、長期間の良好な景観の維持が可能となる。
According to the present invention, any color tone (coloring) suitable for the landscape is made possible. The surface-treated weathering steel material of the present invention is economical because a single-layer coating film is formed.
Arbitrary coloring is possible according to the customer's request, and the formation of a protective rust derived from weathering steel makes it possible to maintain a good landscape for a long period of time.
以下、本発明を具体的に説明する。 Hereinafter, the present invention will be specifically described.
本発明の表面処理耐候性鋼材として適用可能な鋼材は特に限定するものではないが、Ｃｕ、Ｎｉ、Ｃｒ、Ｐ、Ｍｏ等の合金元素を少量含む低合金鋼が好ましい。また、処理面はブラスト処理等で表面のスケールやさびを落とした状態が好ましいが、必ずしもこの必要はない。
そして、本発明の表面処理耐候性鋼材は表面に任意の色調を有する塗膜を有している。
前記塗膜は、水蒸気透過率が１０〜１０００ｇ／ｍ2・ｄａｙ、水酸基価が５０〜７００ｍｇＫＯＨ／ｇ、膜厚が３０〜９０μｍであり、かつ、亜鉛を３〜３０質量％含有し、基体樹脂にアニオン性官能基を有する化合物を配合した樹脂組成物を含有し、固形分あたりの比率が重量比で３０〜８０質量％である顔料(上記亜鉛を含む)を含む。好ましくは、鉄イオンに対し捕捉沈着作用を有するアニオンと対カチオンとからなる少なくとも１種の塩を含有する。これらは、本発明における特徴であり、最も重要な要件である。
The steel material applicable as the surface-treated weathering steel material of the present invention is not particularly limited, but a low alloy steel containing a small amount of alloy elements such as Cu, Ni, Cr, P, and Mo is preferable. The treated surface is preferably in a state in which the scale and rust on the surface have been removed by blasting or the like, but this is not always necessary.
And the surface-treated weathering steel material of this invention has the coating film which has arbitrary color tone on the surface.
The coating film has a water vapor transmission rate of 10 to 1000 g / m 2 · day, a hydroxyl value of 50 to 700 mg KOH / g, a film thickness of 30 to 90 μm, and 3 to 30% by mass of zinc. A resin composition containing a compound having an anionic functional group is contained, and a pigment (including the above zinc) having a ratio per solid content of 30 to 80% by mass is included. Preferably, it contains at least one salt composed of an anion having a trapping action on iron ions and a counter cation. These are features in the present invention and are the most important requirements.
水蒸気透過率が１０〜１０００ｇ／ｍ2・ｄａｙ
一般の長期防食を目的とした塗料と比較し、著しく大きな水蒸気透過率であるが、水蒸気透過率をこの範囲内とすることで塗膜下の保護性さびが効率よく生成し、かつ流れさびや塗膜の膨れ、フィルム状の剥離等の外観異常が極めて起こりにくい状態を維持したまま、長期間良好な着色景観を維持しうることが可能となる。すなわち、水蒸気透過率が１０ｇ／ｍ2・ｄａｙ未満では、鋼の界面に充分に水分が供給されない結果、さびの生成自体が起こりにくくなり保護性さびの形成が不十分となる。また、水蒸気透過率が１０００ｇ／ｍ2・ｄａｙ超えでは、鋼の界面に過度に水分が供給される結果、流れさびが発生し、外観不良が発生する。
なお、水蒸気透過率は、４０℃の条件で測定したものとする。また、水蒸気透過率は、硬化被膜を単離して、ＪＩＳ Ｋ ７１２９に規定された方法、あるいはこの方法に準じた方法で測定することができる。
Water vapor transmission rate is 10 to 1000 g / m 2 · day
Compared with general paint for the purpose of long-term anticorrosion, the water vapor transmission rate is remarkably large, but by setting the water vapor transmission rate within this range, protective rust under the coating film is efficiently generated, and flow rust and It is possible to maintain a good colored landscape for a long time while maintaining a state in which appearance abnormalities such as swelling of the coating film and film-like peeling are extremely unlikely to occur. That is, when the water vapor transmission rate is less than 10 g / m 2 · day, water is not sufficiently supplied to the steel interface. As a result, the formation of rust is less likely to occur and the formation of protective rust becomes insufficient. On the other hand, if the water vapor transmission rate exceeds 1000 g / m 2 · day, excessive water is supplied to the steel interface, resulting in flow rust and poor appearance.
In addition, water vapor permeability shall be measured on 40 degreeC conditions. The water vapor transmission rate can be measured by isolating the cured film and using a method defined in JIS K 7129 or a method according to this method.
水酸基価が５０〜７００ｍｇＫＯＨ／ｇ
この範囲は、一般の長期防食を目的とした塗料と比較し、著しく大きな値である。例えば、同様の目的で使用されるアクリル樹脂では、水酸基価は５〜３０ｍｇＫＯＨ／ｇ程度の値である。水酸基価を、５０〜７００ｍｇＫＯＨ／ｇの範囲内とすることで、さび安定化処理の風化時外観が良くなる。
また、密着性、水蒸気透過性、耐水性も適切な範囲とすることができる。水酸基価が５０ｍｇＫＯＨ／ｇ未満では、塗膜の鋼に対する密着性が低下する結果、フクレなどの外観異常が発生しやすくなる。また、７００ｍｇＫＯＨ／ｇ超えでは、塗膜の耐水性が低下する結果、やはり外観異常が発生しやすくなる。よって、水酸基価は５０〜７００ｍｇＫＯＨ／ｇとする。好ましくは、１００〜３００ｍｇＫＯＨ／ｇである。
Hydroxyl value is 50 to 700 mgKOH / g
This range is a remarkably large value compared with the coating material aiming at general long-term corrosion prevention. For example, an acrylic resin used for the same purpose has a hydroxyl value of about 5 to 30 mgKOH / g. By setting the hydroxyl value within the range of 50 to 700 mgKOH / g, the appearance during weathering of the rust stabilization treatment is improved.
Moreover, adhesiveness, water vapor permeability, and water resistance can also be set to appropriate ranges. When the hydroxyl value is less than 50 mgKOH / g, the adhesion of the coating film to steel decreases, and as a result, appearance abnormalities such as blisters tend to occur. On the other hand, if it exceeds 700 mgKOH / g, the water resistance of the coating film is lowered, and as a result, appearance abnormality is likely to occur. Therefore, the hydroxyl value is 50 to 700 mgKOH / g. Preferably, it is 100-300 mgKOH / g.
膜厚が３０〜９０μｍ
本発明の塗膜は、鋼材表面に処理された状態で屋外環境にさらされることで、紫外線劣化を起こし長期間かけて次第に風化し消滅していくものであり、塗膜の膜厚が９０μｍ超えでは、塗膜風化過程における外観保持機能が低下する。一方、３０μｍ未満では、流れさびを抑制する効果が劣る。
Film thickness is 30 ~ 90μm
The coating film of the present invention is exposed to the outdoor environment in a state where it is treated on the surface of the steel material, which causes UV deterioration and gradually weathers and disappears over a long period of time. The film thickness of the coating film exceeds 90 μm. Then, the external appearance maintenance function in a coating-film weathering process falls. On the other hand, if it is less than 30 μm, the effect of suppressing flow rust is poor.
亜鉛を３〜３０質量％含有
亜鉛は防さび性を有するため、さびの発生および成長を遅らせ、初期の流れさび発生に基づく外観変化を軽減する作用がある。３質量％未満ではさび発生を遅らせる効果が少ない。一方、３０質量％超えでは耐候性鋼由来の保護性さびが形成しにくくなる。
Since zinc containing 3 to 30% by mass of zinc has rust prevention properties, it has the effect of delaying the generation and growth of rust and reducing the appearance change based on the initial generation of flow rust. If it is less than 3% by mass, the effect of delaying the occurrence of rust is small. On the other hand, if it exceeds 30% by mass, it becomes difficult to form protective rust derived from weathering steel.
基体樹脂にアニオン性官能基を有する化合物を配合した樹脂組成物を含有
基体樹脂に、例えば、アニオン性官能基であるフリーのカルボキシル基を含有し、酸価が１０〜１００である樹脂組成物を用いることにより、有害な塩化物イオンの浸透を抑制し、塗膜表面に流れさびが発生しにくくなる。また、保護性さびの形成を補助する効果もある。
A resin composition containing a compound having an anionic functional group in a base resin contains, for example, a free carboxyl group that is an anionic functional group, and a resin composition having an acid value of 10 to 100. By using it, the penetration of harmful chloride ions is suppressed, and flow rust is hardly generated on the surface of the coating film. It also has the effect of assisting the formation of protective rust.
固形分あたりの比率が重量比で３０〜８０質量％である顔料を有する
比率を３０〜８０質量％の範囲内とすることで、保護性さびを最適に形成させることができる。３０質量％未満では塗膜が緻密になり、水蒸気透過率が低くなりすぎる結果、さびの生成自体が起こりにくくなり保護性さびの形成が不十分となる。一方、８０質量％超えでは顔料成分が樹脂成分に対し多くなりすぎる結果、密着性が良好な塗膜が得られなくなる。
Protective rust can be optimally formed by setting the ratio of the pigment having a ratio of solid content of 30 to 80% by mass within a range of 30 to 80% by mass. If it is less than 30% by mass, the coating film becomes dense and the water vapor transmission rate becomes too low. As a result, the formation of rust itself hardly occurs and the formation of protective rust becomes insufficient. On the other hand, if it exceeds 80% by mass, the pigment component becomes too much relative to the resin component, so that a coating film with good adhesion cannot be obtained.
本発明の表面処理耐候性鋼材は表面に任意の色調を有する塗膜を有することができる。顔料としては、特に限定されず、一般の処理剤に含有されうる無機顔料および有機顔料を用いることができる。顔料としては、キナクリロンレッド系、フタロシアニングリーン系、フタロシアニンブルー系、アンスラキノン系イエローなどを用いることができ、他には、バライト、沈降性硫酸バリウム、白亜、沈降性炭酸カルシウム、タルク、シリカ白、アルミナ白、サチン白、グロスホワイト、ベントナイト、ケイ酸カルシウム、沈降性炭酸マグネシウム、ケイ酸アルミニウム、酸化チタン、リトボン、硫化亜鉛、酸化ジルコン、アンチモン白、酸化スズ、カーボンブラック、黒鉛、鉄黒、炭化ケイ素、ベンガラ、モリブデン赤、亜酸化銅、アンバー、合成オーカ、チタン黄、アンチモン黄、バリウム黄、ストロンチウム黄、ビリジアン、亜鉛緑、コバルト緑、エメラルド緑、マンガン緑、紺青、群青、コバルト青、セルリアン青、マンガン青、マンガン紫、濃口コバルト紫、淡口コバルト紫、マルス紫、アルミ粉等が上げられる。
これら顔料を適宜組み合わせ、所定の配合量で用いる。
The surface-treated weathering steel material of the present invention can have a coating film having an arbitrary color tone on the surface. The pigment is not particularly limited, and inorganic pigments and organic pigments that can be contained in general treatment agents can be used. As pigments, quinaclonone red, phthalocyanine green, phthalocyanine blue, anthraquinone yellow, etc. can be used. Others include barite, precipitated barium sulfate, chalk, precipitated calcium carbonate, talc, silica. White, alumina white, satin white, gloss white, bentonite, calcium silicate, precipitated magnesium carbonate, aluminum silicate, titanium oxide, ritbon, zinc sulfide, zircon oxide, antimony white, tin oxide, carbon black, graphite, iron black , Silicon carbide, bengara, molybdenum red, cuprous oxide, amber, synthetic ocher, titanium yellow, antimony yellow, barium yellow, strontium yellow, viridian, zinc green, cobalt green, emerald green, manganese green, bitumen, ultramarine blue, cobalt blue , Cerulean blue, manganese blue, man Down purple, dark soy cobalt violet, pale mouth cobalt violet, Mars violet, aluminum powder, and the like.
These pigments are appropriately combined and used in a predetermined blending amount.
鉄イオンに対し捕捉沈着作用を有するアニオンと対カチオンとからなる少なくとも１種の塩を含有
本発明において塗膜中に含有される鉄イオンに対し捕捉沈着作用を有するアニオンと対カチオンからなる塩とは、腐食反応で生成する鉄イオンと反応し、ある条件下において沈着皮膜を形成しうるアニオンと対カチオンからなる塩のことを指す。かかるアニオンの例としては、リン酸イオン、クロム酸イオン、ベリリウム酸イオン、ケイ酸イオン、チタン酸イオン、バナジン酸イオン、マンガン酸イオン、セレニウム酸イオン、ジルコニウム酸イオン、モリブデン酸イオン、タングステン酸イオン等が挙げられる。これらの中で、リン酸イオンおよび／またはモリブデン酸イオンをアニオンとした塩が含有された塗膜であることがさび安定化過程における流れさび等による外観劣化を効率よく防ぐと共に、皮膜下に効率よく保護性さびを生成しうるので好ましい。具体的な例としては、リン酸亜鉛、リン酸アルミニウム、リン酸アンモニウム、リン酸一水素カルシウム、リン酸カドミウム、リン酸カリウム、リン酸カルシウム、リン酸銀、リン酸クロム、リン酸コバルト、リン酸水銀、リン酸水素アンモニウムナトリウム、リン酸水素ウラニル、リン酸水素ストロンチウム、リン酸水素二アンモニウム、リン酸水素二カリウム、リン酸水素二銀、リン酸水素二ナトリウム、リン酸水素バリウム、リン酸水素マグネシウム、リン酸水素マンガン、リン酸セリウム、リン酸タリウム、リン酸鉄、リン酸銅、リン酸トリウム、リン酸ナトリウム、リン酸鉛、リン酸二水素亜鉛、リン酸二水素カドミウム、リン酸二水素アンモニウム、リン酸二水素カリウム、リン酸二水素カルシウム、リン酸二水素ナトリウム、リン酸二水素バリウム、リン酸二水素マンガン、リン酸二水素リチウム、リン酸ニッケル、リン酸バリウム、リン酸ビスマス、リン酸マグネシウム、リン酸マグネシウムアンモニウム、リン酸マンガン、リン酸リチウム、リンタングステン酸ナトリウム、リンモリブデン酸ナトリウム、リンモリブデン酸アルミニウム、リンモリブデン酸アンモニウム、トリポリリン酸二水素アルミニウム、モリブデン酸ナトリウム、モリブデン酸亜鉛、モリブデン酸アンモニウム、モリブデン酸カリウム、モリブデン酸カルシウム、モリブデン酸鉛等が挙げられる。これら以外に、クロム酸塩、バナジン酸塩、タングステン酸塩等、他の鉄イオンを捕捉沈着しうる塩を添加することも出来る。
Contains at least one salt composed of an anion having a trapping action on iron ions and a counter cation In the present invention, a salt comprising an anion having a trapping action on iron ions contained in the coating film and a counter cation Refers to a salt composed of an anion and a counter cation that can react with iron ions generated by a corrosion reaction and form a deposited film under a certain condition. Examples of such anions include phosphate, chromate, beryllate, silicate, titanate, vanadate, manganate, selenate, zirconate, molybdate, and tungstate ions. Etc. Among these, a coating film containing a salt having phosphate ions and / or molybdate ions as anions effectively prevents appearance deterioration due to flow rust in the rust stabilization process and is effective under the coating. It is preferable because it can generate protective rust well. Specific examples include zinc phosphate, aluminum phosphate, ammonium phosphate, calcium monohydrogen phosphate, cadmium phosphate, potassium phosphate, calcium phosphate, silver phosphate, chromium phosphate, cobalt phosphate, mercury phosphate. , Sodium ammonium hydrogen phosphate, uranyl hydrogen phosphate, strontium hydrogen phosphate, diammonium hydrogen phosphate, dipotassium hydrogen phosphate, disilver hydrogen phosphate, disodium hydrogen phosphate, barium hydrogen phosphate, magnesium hydrogen phosphate , Manganese hydrogen phosphate, cerium phosphate, thallium phosphate, iron phosphate, copper phosphate, thorium phosphate, sodium phosphate, lead phosphate, zinc dihydrogen phosphate, cadmium dihydrogen phosphate, dihydrogen phosphate Ammonium, potassium dihydrogen phosphate, calcium dihydrogen phosphate, sodium dihydrogen phosphate, Barium dihydrogen phosphate, manganese dihydrogen phosphate, lithium dihydrogen phosphate, nickel phosphate, barium phosphate, bismuth phosphate, magnesium phosphate, magnesium ammonium phosphate, manganese phosphate, lithium phosphate, phosphotungstic acid Examples include sodium, sodium phosphomolybdate, aluminum phosphomolybdate, ammonium phosphomolybdate, aluminum dihydrogen phosphate, sodium molybdate, zinc molybdate, ammonium molybdate, potassium molybdate, calcium molybdate, and lead molybdate. . In addition to these, salts capable of capturing and depositing other iron ions, such as chromate, vanadate, and tungstate, can also be added.
これらの鉄イオンに対し捕捉沈着作用を有する塩を添加する場合には、固形分あたりの比率が重量比で５〜１０質量％が好適であり、他の顔料との合計で固形分あたりの比率が重量比で３０〜８０質量％とする。 When adding a salt having a trapping and depositing action to these iron ions, the ratio per solid content is preferably 5 to 10% by weight, and the ratio per solid content in total with other pigments Is 30 to 80% by mass by weight.
本発明のさび安定化処理鋼材の塗膜には、上記以外に、ナフテン酸コバルト、ナフテン酸鉛等の硬化促進剤、増粘剤、その他の無機塩、溶剤、処理剤添加物等を含有することが出来る。 In addition to the above, the coating film of the rust-stabilized steel material of the present invention contains a hardening accelerator such as cobalt naphthenate and lead naphthenate, a thickener, other inorganic salts, a solvent, a processing agent additive, and the like. I can do it.
本発明の表面処理耐候性鋼材の製造方法については、特に制限はなく、従来公知の方法に従えばよいが、好適な製造条件を述べると次のとおりである。
本発明のさび安定化処理鋼材は、鋼材表面のスケールをサンドブラスト、ショットブラスト等で除去した後に、本発明で規定した塗膜を形成しうる処理剤、すなわち前記した成分を含むさび安定化処理剤を塗布し、乾燥して塗膜を形成するのが好ましい。さび安定化処理剤の鋼材表面への塗膜形成方法は、通常の塗料と同様、エアスプレー、エアレススプレー、刷毛塗り等の方法が適用できる。本発明のさび安定化処理鋼材は、一般的な塗料調整法を用いることができ、例えば、塗料に用いられる公知の有機溶剤に上記樹脂成分を溶解させ、そこに上記亜鉛粉および顔料成分を加え，ボールミルなどを用いて分散させることにより得られる。
There is no restriction | limiting in particular about the manufacturing method of the surface treatment weather-resistant steel materials of this invention, Although what is necessary is just to follow a conventionally well-known method, it is as follows when suitable manufacturing conditions are described.
The rust stabilization treatment steel material of the present invention is a rust stabilization treatment agent containing the above-described components, that is, a treatment agent capable of forming a coating film defined by the present invention after removing the scale of the steel material surface by sandblasting, shot blasting, etc. Is preferably applied and dried to form a coating film. As a method of forming a coating film on the steel material surface of the rust stabilizing agent, methods such as air spray, airless spray, and brush coating can be applied as in the case of ordinary paints. The rust-stabilized steel material of the present invention can use a general paint adjusting method. For example, the resin component is dissolved in a known organic solvent used in the paint, and the zinc powder and pigment component are added thereto. It is obtained by dispersing using a ball mill or the like.
JIS G 3114に規定された耐候性鋼材(SMA 400) 試験片（150mm ×70mm×6mm ）をブラスト処理した後に表１に示した成分系の処理剤を所定の膜厚塗布した。なお、基体樹脂としては、アニオン性官能基としてフリーのカルボキシル基を有する酸価が50のエポキシエステル樹脂(ヒマシ油変性エポキシ樹脂とヘキサハイドロフタリックアシッドとの反応生成物)を用いた。 A weathering steel (SMA 400) test piece (150 mm × 70 mm × 6 mm) defined in JIS G 3114 was blasted, and then a component processing agent shown in Table 1 was applied to a predetermined thickness. As the base resin, an epoxy ester resin having a free carboxyl group as an anionic functional group and an acid value of 50 (reaction product of castor oil-modified epoxy resin and hexahydrophthalic acid) was used.
また、着色顔料としては、二酸化チタン、銅フタロシアニン顔料、高塩素化銅フタロシアニン顔料を使用した。なお、表１に記載した以外の成分として、硬化促進剤としてナフテン酸コバルトとナフテン酸鉛を、樹脂と顔料からなる固形分１００質量部に対して、それぞれ０．１質量部、その他処理剤としての物性を調整するための添加剤を適宜添加した。尚表１中の質量％は硬化塗膜中の質量％である。 Further, titanium dioxide, copper phthalocyanine pigment, and highly chlorinated copper phthalocyanine pigment were used as the coloring pigment. In addition, as components other than those described in Table 1, cobalt naphthenate and lead naphthenate as curing accelerators are each 0.1 parts by mass with respect to 100 parts by mass of a solid content composed of a resin and a pigment, and as other processing agents. Additives for adjusting the physical properties were appropriately added. The mass% in Table 1 is the mass% in the cured coating film.
表１に記載した処理剤を塗布した表面処理耐候性鋼材を下記の方法で性能を評価した。
海岸地帯暴露( ３年、南面３０°暴露) による流れさび有無、保護性さび形成の有無および塗膜外観を調査した。
流れさび有無：塗膜表面の外観で評価した。
◎：全く見られない
○：殆ど見られない
△：多少見られる
×：顕著に見られる
保護性さび形成：塗膜を剥がし、塗膜下のさびの状況を調べ、以下の評価をした。
○：緻密なさびが連続的に形成されている
△：さびが形成されているものの、緻密さに欠け、欠陥が多い
×：層状の剥がれやすいさびが形成されている
塗膜外観：塗膜にフクレやフィルム状の塗膜剥離が発生しているかどうか調べた。
○：フクレや剥離が殆ど見られない
△：フクレと剥離が見られ、やや外観が悪い
×：フクレ、剥離が顕著に見られ、外観が極めて悪い
以上により得られた結果を表１に示す。
The performance of the surface-treated weathering steel material coated with the treating agent described in Table 1 was evaluated by the following method.
We investigated the presence or absence of flow rust, the presence or absence of protective rust, and the appearance of the coating film due to coastal zone exposure (3 years, 30 ° south surface exposure).
Flow rust presence / absence: The appearance of the coating film surface was evaluated.
：: not seen at all ◯: hardly seen △: somewhat seen ×: prominent protective rust formation: The coating film was peeled off, the rust condition under the coating film was examined, and the following evaluation was made.
○: Dense rust is continuously formed. Δ: Rust is formed but lacks in density and has many defects. X: Layered rust that is easily peeled is formed Appearance: It was investigated whether bulge or film-like film peeling occurred.
○: Swelling and peeling are hardly seen. Δ: Swelling and peeling are seen, and the appearance is slightly bad. X: Swelling and peeling are noticeably seen and the appearance is extremely bad. Table 1 shows the results obtained.
表1より、本発明の表面処理耐候性鋼材は、海岸環境（厳しい環境を模した促進試験）において、良好な保護性さび形成機能を有し、かつ良好な流れさび防止機能を有し、あるいは更にいずれの試験においても塗膜のフクレやフィルム状剥離が極めて少なく、良好な塗膜外観を保持する。 From Table 1, the surface-treated weathering steel material of the present invention has a good protective rust formation function and a good flow rust prevention function in a coastal environment (accelerated test simulating a severe environment), or Furthermore, in any of the tests, the coating film has no blistering or film-like peeling, and a good coating film appearance is maintained.
Claims (2)
水蒸気透過率が１０〜１０００ｇ／ｍ2・ｄａｙ、水酸基価が５０〜７００ｍｇＫＯＨ／ｇの樹脂からなり、膜厚が３０〜９０μｍであり、かつ、亜鉛を３〜３０質量％含有し、基体樹脂にアニオン性官能基を有する化合物を配合した樹脂組成物を含有し、固形分あたりの比率が重量比で３０〜８０質量％である顔料を含むことを特徴とする表面処理耐候性鋼材。 It is a surface-treated weathering steel material in which a coating film having an arbitrary color tone is formed on the surface,
It consists of a resin having a water vapor transmission rate of 10 to 1000 g / m 2 · day, a hydroxyl value of 50 to 700 mgKOH / g, a film thickness of 30 to 90 μm, and 3 to 30% by mass of zinc. A surface-treated weatherable steel material comprising a resin composition containing a compound having an anionic functional group, and containing a pigment having a weight ratio of 30 to 80% by mass.
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| JP2001081571A (en) * | 1999-09-13 | 2001-03-27 | Nkk Corp | Rust stabilization treated steel and treating method |
| JP2002035686A (en) * | 2000-07-24 | 2002-02-05 | Dainippon Toryo Co Ltd | Method for preventing rusting of weatherable steel |
| JP2003268578A (en) * | 2002-03-15 | 2003-09-25 | Dainippon Toryo Co Ltd | Corrosion inhibition method for weather resistant steel |
| JP2006142157A (en) * | 2004-11-17 | 2006-06-08 | Dainippon Toryo Co Ltd | Corrosion preventing method of weather resistant steel |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2001081571A (en) * | 1999-09-13 | 2001-03-27 | Nkk Corp | Rust stabilization treated steel and treating method |
| JP2002035686A (en) * | 2000-07-24 | 2002-02-05 | Dainippon Toryo Co Ltd | Method for preventing rusting of weatherable steel |
| JP2003268578A (en) * | 2002-03-15 | 2003-09-25 | Dainippon Toryo Co Ltd | Corrosion inhibition method for weather resistant steel |
| JP2006142157A (en) * | 2004-11-17 | 2006-06-08 | Dainippon Toryo Co Ltd | Corrosion preventing method of weather resistant steel |
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