JP5538602B1 - Method of coating hot-dip galvanized steel sheet surface - Google Patents
Method of coating hot-dip galvanized steel sheet surface Download PDFInfo
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- JP5538602B1 JP5538602B1 JP2013173094A JP2013173094A JP5538602B1 JP 5538602 B1 JP5538602 B1 JP 5538602B1 JP 2013173094 A JP2013173094 A JP 2013173094A JP 2013173094 A JP2013173094 A JP 2013173094A JP 5538602 B1 JP5538602 B1 JP 5538602B1
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- galvanized steel
- steel sheet
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- 238000000576 coating method Methods 0.000 title claims abstract description 61
- 239000011248 coating agent Substances 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 8
- 229910001335 Galvanized steel Inorganic materials 0.000 title claims description 20
- 239000008397 galvanized steel Substances 0.000 title claims description 20
- 239000003973 paint Substances 0.000 claims abstract description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229920000800 acrylic rubber Polymers 0.000 claims abstract description 8
- 229920000058 polyacrylate Polymers 0.000 claims abstract description 8
- 239000002184 metal Substances 0.000 abstract description 18
- 229910052751 metal Inorganic materials 0.000 abstract description 18
- 239000000463 material Substances 0.000 description 9
- 229910000831 Steel Inorganic materials 0.000 description 8
- 239000010959 steel Substances 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 6
- 239000002987 primer (paints) Substances 0.000 description 4
- 229920001971 elastomer Polymers 0.000 description 3
- 239000003822 epoxy resin Substances 0.000 description 3
- 238000010422 painting Methods 0.000 description 3
- 229920000647 polyepoxide Polymers 0.000 description 3
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 2
- 229910000599 Cr alloy Inorganic materials 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 239000004566 building material Substances 0.000 description 2
- 229910052801 chlorine Inorganic materials 0.000 description 2
- 239000000460 chlorine Substances 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000007761 roller coating Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 229910000640 Fe alloy Inorganic materials 0.000 description 1
- 229910000914 Mn alloy Inorganic materials 0.000 description 1
- 241000084978 Rena Species 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 229910007570 Zn-Al Inorganic materials 0.000 description 1
- 229910007567 Zn-Ni Inorganic materials 0.000 description 1
- 229910007614 Zn—Ni Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000013065 commercial product Substances 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
【課題】塗膜の耐久性に優れた金属表面をもたらす、下塗り塗料を用いる金属表面の塗装方法の提供。
【解決手段】本発明の金属表面の塗装方法は、アクリルゴム系の水性塗料を下塗りとして用い、フノリを１〜１０重量％含有させることが好ましい。フノリを含有させることにより、塗膜の付着強度や耐久性により優れたものとなり、屋外で長期にわたって塗膜を良好に維持することができる。本発明はアクリルゴム系の水性塗料を下塗りとして用いることを特徴とする。
【選択図】なしProvided is a method for coating a metal surface using an undercoat that provides a metal surface with excellent durability of the coating film.
The metal surface coating method of the present invention preferably uses an acrylic rubber-based water-based paint as an undercoat and contains 1 to 10% by weight of funori. By including funnel, the adhesion strength and durability of the coating film become superior, and the coating film can be maintained well for a long time outdoors. The present invention is characterized by using an acrylic rubber-based water-based paint as an undercoat.
[Selection figure] None
Description
本発明は、ガードレール等の防護柵や外階段の鉄骨などの金属表面のうち、溶融亜鉛めっき鋼板表面の塗装に適用される溶融亜鉛めっき鋼板表面の塗装方法に関する。 The present invention relates to a method for coating the surface of a hot dip galvanized steel sheet, which is applied to the surface of a hot dip galvanized steel sheet among metal surfaces such as a guard fence such as a guardrail and a steel frame of an outer staircase.
金属表面に塗装を施す場合、塗装系の付着性向上や錆止めなどのために、下塗りを施すのが一般的である。
そして、このような下塗りに用いられる塗料としては、例えば、変性エポキシ樹脂塗料（例えば、特許文献１参照）や塩化ゴム系樹脂塗料などが知られている。
When coating a metal surface, it is common to apply a primer to improve the adhesion of the coating system and prevent rust.
And as a paint used for such undercoat, a modified epoxy resin paint (for example, refer patent document 1), a chlorinated rubber-type resin paint, etc. are known, for example.
しかしながら、特に屋外では、風雨や気温の変化などに曝されるため、長期にわたって塗膜を良好に維持することが困難であった。
さらに、金属の熱膨張によって塗膜にわれが生じやすいことも、塗膜の劣化を早める原因であった。
そのため、金属表面に塗装を施した場合、特に屋外において、塗膜を長期にわたって良好に維持することは非常に困難であって、上記の如き従来の塗装方法においても、塗膜の耐久性が十分とは言えなかった。
そして、塗膜の耐久性が十分でないために、頻繁に補修を要することとなり、また、塗膜の劣化により、塗装を施した金属の錆び等も発生させ、金属自体の耐久性にも悪影響を及ぼしかねないものであった。
However, particularly outdoors, it is difficult to maintain a coating film well over a long period of time because it is exposed to wind and rain, changes in temperature, and the like.
Furthermore, the fact that the coating film is easily cracked due to the thermal expansion of the metal has also caused the deterioration of the coating film.
For this reason, it is very difficult to maintain a coating film well over a long period of time, especially when applied to metal surfaces, and the durability of the coating film is sufficient even with the conventional coating methods as described above. I couldn't say that.
And, since the durability of the coating film is not sufficient, frequent repairs are required, and deterioration of the coating film also causes rusting of the coated metal, which adversely affects the durability of the metal itself. It was something that could be affected.
そこで、本発明は、塗膜の耐久性に優れた溶融亜鉛めっき鋼板表面の塗装方法を提供することを目的とする。 Then, an object of this invention is to provide the coating method of the hot dip galvanized steel plate surface excellent in durability of a coating film.
本発明者は、上記課題を解決するために鋭意研究を重ね、その結果、アクリルゴム系の水性塗料を下塗りとして用いることとすれば、極めて高い耐久性を備えた塗膜を形成しうることを見出し、本発明を完成するに至った。 The present inventor has intensively studied to solve the above problems, and as a result, if an acrylic rubber-based water-based paint is used as an undercoat, a coating film having extremely high durability can be formed. The headline and the present invention were completed.
すなわち、本発明にかかる溶融亜鉛めっき鋼板表面の塗装方法は、アクリルゴム系の水性塗料を、下塗りとして溶融亜鉛めっき鋼板の表面に直接塗布することを特徴とする。
以下では、溶融亜鉛めっき鋼板以外の金属表面の塗装方法についての説明も含んでいるが、本発明の対象は、溶融亜鉛めっき鋼板表面の塗装方法である。
That is, the method for coating the surface of a hot dip galvanized steel sheet according to the present invention is characterized in that an acrylic rubber-based water-based paint is directly applied to the surface of the hot dip galvanized steel sheet as an undercoat.
Below, although the description about the coating method of metal surfaces other than a hot dip galvanized steel plate is also included, the object of this invention is the coating method of the hot dip galvanized steel plate surface.
本発明によれば、極めて耐久性に優れた塗膜を形成しうる。 According to the present invention, a coating film having extremely excellent durability can be formed.
以下、本発明にかかる金属表面の塗装方法について詳しく説明するが、本発明の範囲はこれらの説明に拘束されることはなく、以下の例示以外についても、本発明の趣旨を損なわない範囲で適宜変更実施し得る。 Hereinafter, although the coating method of the metal surface concerning this invention is demonstrated in detail, the scope of the present invention is not restrained by these explanations, and other than the following illustrations, the scope of the present invention is not limited. Changes can be made.
〔塗装対象〕
本発明は、金属表面の塗装方法であるが、対象となる金属表面としては特に限定されず、例えば、亜鉛めっき鋼板（特に溶融亜鉛めっき鋼板）、Ｚｎ−Ｎｉ合金めっき鋼板、Ｚｎ−Ｆｅ合金めっき鋼板、Ｚｎ−Ｍｎ合金めっき鋼板、Ｚｎ−Ｃｒ合金めっき鋼板、Ｚｎ−Ａｌ合金めっき鋼板、Ｚｎ−Ｃｏ−Ｃｒ合金めっき鋼板等の亜鉛系めっき鋼板に対して好適に適用することができる。
[For painting]
The present invention is a method for coating a metal surface, but is not particularly limited as a target metal surface. For example, a galvanized steel sheet (particularly a hot dip galvanized steel sheet), a Zn-Ni alloy plated steel sheet, a Zn-Fe alloy plated It can be suitably applied to zinc-based plated steel sheets such as steel sheets, Zn—Mn alloy plated steel sheets, Zn—Cr alloy plated steel sheets, Zn—Al alloy plated steel sheets, Zn—Co—Cr alloy plated steel sheets.
〔下塗り〕
本発明の塗装方法においては、アクリル系ゴムの水性塗料を下塗りとする。
アクリル系ゴムの水性塗料は、塗膜が微弾性を有するものであり、例えば、市販品として、エスケー化研社製の「レナフレンド」の主材、日本ペイント社製の「ＤＡＮタイル」の主材などが好ましく挙げられる。なお、これらは、建材用中塗り材として中塗りに用いられるものであって、本来、金属表面の下塗りへの使用が予定されているものではない。
本発明の塗装方法において、上記市販の建材用中塗り材を下塗りに転用する場合には、水で希釈するなど、適宜の調整を施すべきである。
〔undercoat〕
In the coating method of the present invention, an acrylic rubber water-based paint is used as an undercoat.
Aqueous paints based on acrylic rubber have a slightly elastic coating film. For example, as a commercial product, the main material of “Lenafriend” manufactured by SK Kaken Co., Ltd. and the “DAN tile” manufactured by Nippon Paint Co., Ltd. A material etc. are mentioned preferably. These are used as intermediate coating materials for building materials, and are not intended to be used for undercoating on metal surfaces.
In the coating method of the present invention, when the above-mentioned commercially available intermediate coating material for building materials is diverted to an undercoat, appropriate adjustments such as dilution with water should be performed.
前記水性塗料には、フノリを含有させることが好ましい。フノリを含有させることにより、塗膜の付着強度や耐久性により優れたものとなる。
前記フノリの含有量としては、前記水性塗料全量に対して、１重量％以上の割合であることが好ましく、１〜１０重量％の割合であることがより好ましい。
The water-based paint preferably contains funnel. By including funnel, the adhesion strength and durability of the coating film are improved.
The content of the funori is preferably 1% by weight or more, more preferably 1 to 10% by weight, based on the total amount of the water-based paint.
下塗り塗膜の膜厚としては、例えば、乾燥膜厚１５〜２０μｍ程度とすることが好ましい。 The thickness of the undercoat coating film is preferably about 15 to 20 μm, for example.
下塗りの塗装は、特に限定するわけではないが、例えば、刷毛塗り、ローラー塗り、吹付機などにより行うことができる。 The undercoat coating is not particularly limited, and can be performed by, for example, brush coating, roller coating, or spraying machine.
〔中塗り、上塗り〕
下塗り塗膜の上には、中塗りや上塗りが塗装される。微弾性を有する下塗りとの関係で、中塗りや上塗りも弾性塗料であることが望ましい。
このような中塗りや上塗りに用いる塗料としては、特に限定されないが、例えば、フッ素系塗料、ウレタン系塗料（市販品として、例えば、日本ペイント社製の２液ファインウレタン塗料）などが好適に挙げられる。
[Intermediate coating, top coating]
On the undercoat film, an intermediate coat or top coat is applied. It is desirable that the intermediate coating and the top coating are also elastic paints in relation to the undercoat having fine elasticity.
Although it does not specifically limit as a coating material used for such intermediate coating or top coating, For example, a fluorine-type coating material, urethane type coatings (As a commercial item, for example, 2 liquid fine urethane coating made by Nippon Paint Co., Ltd.) etc. are mentioned suitably. It is done.
中塗り塗膜や上塗り塗膜の膜厚としては、特に限定するわけではないが、例えば、乾燥膜厚２０〜２５μｍ程度とすることが好ましい。 The film thickness of the intermediate coating film or the top coating film is not particularly limited, but for example, a dry film thickness of about 20 to 25 μm is preferable.
中塗りや上塗りの塗装は、特に限定するわけではないが、例えば、刷毛塗り、ローラー塗り、吹付機などにより行うことができる。 The intermediate coating or top coating is not particularly limited, but can be performed by, for example, brush coating, roller coating, or spraying.
以下、実施例を用いて、本発明にかかる金属表面の塗装方法について詳しく説明するが、本発明はこれら実施例に限定されるものではない。 Hereinafter, although the coating method of the metal surface concerning this invention is demonstrated in detail using an Example, this invention is not limited to these Examples.
〔実施例１〕
縦９ｃｍ×横４．５ｃｍ×厚み０．５ｃｍの溶融亜鉛めっき鋼板に対して、以下の塗装を行った。
すなわち、まず、「レナフレンド」（登録商標。エスケー化研社製）の主材１０ｋｇに、水１０ｋｇを加えて希釈し、ここにフノリ０．５ｋｇを加えて、下塗り用の水性塗料を調製した。
次に、前記亜鉛めっき鋼板に対して、前記水性塗料を刷毛で乾燥膜厚２０μｍとなるように塗装した。
そののち、下塗り塗膜の上に、上塗り用塗料として「ファインウレタン」（日本ペイント社製）を刷毛で乾燥膜厚４０μｍ（２０μｍ×２回）となるように塗装し、試験板を得た。
[Example 1]
The following coating was performed on a hot-dip galvanized steel sheet 9 cm long x 4.5 cm wide x 0.5 cm thick.
That is, first, 10 kg of water was added to 10 kg of the main material of “RENA FRIEND” (registered trademark, manufactured by SK Kaken Co., Ltd.) to dilute, and 0.5 kg of funori was added thereto to prepare an aqueous paint for undercoating. .
Next, the water-based paint was applied to the galvanized steel sheet with a brush so as to have a dry film thickness of 20 μm.
After that, “Fine Urethane” (manufactured by Nippon Paint Co., Ltd.) was applied as a top coating on the undercoating film with a brush so as to have a dry film thickness of 40 μm (20 μm × 2 times) to obtain a test plate.
〔実施例２〕
まず、「ＤＡＮタイル」（登録商標。日本ペイント社製）の主材１０ｋｇに、水１０ｋｇを加えて希釈し、ここにフノリ０．５ｋｇを加えて、下塗り用の水性塗料を調製した。
次に、実施例１と同様の溶融亜鉛めっき鋼板に対して、前記水性塗料を刷毛で乾燥膜厚２０μｍとなるように塗装した。
そののち、下塗り塗膜の上に、上塗り用塗料として「ファインウレタン」（日本ペイント社製）を刷毛で乾燥膜厚４０μｍ（２０μｍ×２回）となるように塗装し、試験板を得た。
[Example 2]
First, 10 kg of water was diluted by adding 10 kg of water to 10 kg of the main material of “DAN tile” (registered trademark, manufactured by Nippon Paint Co., Ltd.), and 0.5 kg of funori was added thereto to prepare an aqueous paint for undercoating.
Next, the water-based paint was applied to the same hot-dip galvanized steel sheet as in Example 1 with a brush so as to have a dry film thickness of 20 μm.
After that, “Fine Urethane” (manufactured by Nippon Paint Co., Ltd.) was applied as a top coating on the undercoating film with a brush so as to have a dry film thickness of 40 μm (20 μm × 2 times) to obtain a test plate.
〔実施例３〕
まず、「ＤＡＮタイル」（登録商標。日本ペイント社製）の主材１０ｋｇに、水１０ｋｇを加えて希釈し、ここにフノリを紙コップ一杯分加えて、下塗り用の水性塗料を調製した。
次に、実施例１と同様の溶融亜鉛めっき鋼板に対して、前記水性塗料を刷毛で乾燥膜厚２０μｍとなるように塗装した。
そののち、下塗り塗膜の上に、上塗り用塗料として「アクリエナメル弾性」（エスケー化研社製）を刷毛で乾燥膜厚４０μｍ（２０μｍ×２回）となるように塗装し、試験板を得た。
Example 3
First, 10 kg of water was added to 10 kg of the main material of “DAN tile” (registered trademark, manufactured by Nippon Paint Co., Ltd.) to dilute, and then a full glass of funori was added thereto to prepare an aqueous paint for undercoating.
Next, the water-based paint was applied to the same hot-dip galvanized steel sheet as in Example 1 with a brush so as to have a dry film thickness of 20 μm.
After that, on the undercoating film, “Acryenamel elasticity” (manufactured by SK Kaken Co., Ltd.) was applied as a top coating with a brush to a dry film thickness of 40 μm (20 μm × 2 times) to obtain a test plate. It was.
〔比較例１〕
実施例１と同様の溶融亜鉛めっき鋼板に対して、下塗り用塗料として、変性エポキシ樹脂塗料である「ハイポン２０デクロ」（日本ペイント社製）を刷毛で乾燥膜厚２０μｍとなるように塗装した。
そののち、下塗り塗膜の上に、上塗り用塗料として「ファインウレタン」（日本ペイント社製）を刷毛で乾燥膜厚４０μｍ（２０μｍ×２回）となるように塗装し、試験板を得た。
[Comparative Example 1]
The same hot-dip galvanized steel sheet as in Example 1 was coated with “Hypon 20 Decro”, a modified epoxy resin paint (manufactured by Nippon Paint Co., Ltd.) as a primer coating so that the dry film thickness was 20 μm.
After that, “Fine Urethane” (manufactured by Nippon Paint Co., Ltd.) was applied as a top coating on the undercoating film with a brush so as to have a dry film thickness of 40 μm (20 μm × 2 times) to obtain a test plate.
〔比較例２〕
実施例１と同様の溶融亜鉛めっき鋼板に対して、下塗り用塗料として、塩素ゴム系塗料である「ハイラバーＥスーパー」（日本ペイント社製）を刷毛で乾燥膜厚２０μｍとなるように塗装した。
そののち、下塗り塗膜の上に、上塗り用塗料として「ファインウレタン」（日本ペイント社製）を刷毛で乾燥膜厚４０μｍ（２０μｍ×２回）となるように塗装し、試験板を得た。
[Comparative Example 2]
The same hot-dip galvanized steel plate as in Example 1 was coated with “Hyrubber E Super” (manufactured by Nippon Paint Co., Ltd.), which is a chlorine rubber-based paint, as a primer coating so that the dry film thickness was 20 μm.
After that, “Fine Urethane” (manufactured by Nippon Paint Co., Ltd.) was applied as a top coating on the undercoating film with a brush so as to have a dry film thickness of 40 μm (20 μm × 2 times) to obtain a test plate.
〔性能評価及び結果〕
上記各試験板について、下記試験を行ったのち、試験後の試験板の状態を撮影した。
すなわち、各試験片について、１００℃以上の湯に５分間つけ、続いて、冷水に５分間つけるという作業を２５回繰り返し、この試験を終えた各試験片を撮影した。
実施例１〜３、比較例１，２のそれぞれについて、順次、各写真を図１〜５に示す。
[Performance evaluation and results]
About each said test board, after performing the following test, the state of the test board after a test was image | photographed.
That is, each test piece was immersed in hot water of 100 ° C. or higher for 5 minutes, and then the operation of applying it to cold water for 5 minutes was repeated 25 times, and each test piece that completed this test was photographed.
For each of Examples 1 to 3 and Comparative Examples 1 and 2, photographs are shown in FIGS.
〔考察〕
図１〜５に見るとおり、実施例１〜３の試験板は、試験後においても、ひび割れがなく平滑であり、良好な外観を維持していた。
これに対し、変性エポキシ樹脂塗料を下塗り用塗料とした比較例１の試験板では、試験後にひび割れが生じている。
また、塩素ゴム系塗料を下塗り用塗料とした比較例２の試験板では、試験後において表面に凹凸が生じた。従って、同じゴム系の塗料でも、アクリルゴム系の塗料を用いることが耐久性向上において重要であることがわかった。
[Discussion]
As seen in FIGS. 1 to 5, the test plates of Examples 1 to 3 were smooth without cracks and maintained a good appearance even after the test.
On the other hand, in the test plate of Comparative Example 1 in which the modified epoxy resin coating was used as a primer coating, cracks occurred after the test.
Further, in the test plate of Comparative Example 2 in which a chlorine rubber-based paint was used as an undercoat paint, the surface was uneven after the test. Accordingly, it has been found that it is important to improve the durability of the same rubber-based paint using an acrylic rubber-based paint.
本発明の金属表面の塗装方法は、金属表面、特にガードレール、橋、外階段などの屋外に置かれた金属の表面塗装に好適に利用することができる。 The method for painting a metal surface according to the present invention can be suitably used for painting a metal surface, particularly a metal surface placed outdoors such as a guardrail, a bridge, or an outer staircase.
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| JP2011020006A (en) * | 2009-07-13 | 2011-02-03 | Mitsubishi Plastics Inc | Rust preventive coating method |
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