JP2002212508A - Method for producing powdered coating, powdered coating and anticorrosion-treated steel material - Google Patents
Method for producing powdered coating, powdered coating and anticorrosion-treated steel materialInfo
- Publication number
- JP2002212508A JP2002212508A JP2001008340A JP2001008340A JP2002212508A JP 2002212508 A JP2002212508 A JP 2002212508A JP 2001008340 A JP2001008340 A JP 2001008340A JP 2001008340 A JP2001008340 A JP 2001008340A JP 2002212508 A JP2002212508 A JP 2002212508A
- Authority
- JP
- Japan
- Prior art keywords
- coating
- resin
- powdered coating
- powder
- zinc powder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
- Laminated Bodies (AREA)
- Paints Or Removers (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、防錆被覆されたＰ
Ｃ鋼線、鋼棒、または鉄筋などの鋼材及び被膜の防錆効
果を高めた静電塗装が可能な粉体塗料及びその製造方法
に関する。TECHNICAL FIELD The present invention relates to a rust-proof coated P
TECHNICAL FIELD The present invention relates to a powder coating material capable of electrostatic coating with enhanced rust-preventing effect on steel materials such as C-steel wire, steel rod or reinforcing steel, and a coating film, and a method for producing the same.
【０００２】[0002]
【従来の技術】特公平１−５４１４２号公報及び特許第
２６９１１１３号公報には、ＰＣ鋼より線にエポキシ樹
脂被膜を静電塗装によって形成することが記載されてい
る。樹脂被膜にはピンホールが存在することがあり、塗
装工程の最後にピンホール検査をおこなっているが、全
てを検出することができず、検出漏れがあり、海岸・海
洋構造物また地中構造物などの苛酷な環境下において
は、年月の経過と共にピンホールから塩素や酸などの腐
食成分を含有する水が進入し、腐食が進行して構造物に
重大な被害を与えることがある。2. Description of the Related Art Japanese Patent Publication No. 1-54142 and Japanese Patent No. 2691113 describe that an epoxy resin film is formed on a PC steel stranded wire by electrostatic coating. Pinholes may be present in the resin coating, and pinhole inspection is performed at the end of the painting process, but not all of them can be detected. In a harsh environment such as an object, water containing a corrosive component such as chlorine or acid enters from a pinhole with the passage of time, and corrosion may progress to seriously damage a structure.
【０００３】そこで、樹脂被膜の下塗りとして電気化学
的防錆機能を有する亜鉛メッキを樹脂被膜の下に形成す
ることが特開平１１−１２０８２６号公報に開示されて
いる。Japanese Patent Application Laid-Open No. H11-120826 discloses that zinc plating having an electrochemical rust-preventing function is formed under a resin film as an undercoat of the resin film.
【０００４】また、鋼材の防食塗料として亜鉛粉末を顔
料としたジンクリッチペイントがよく知られており、主
に防食塗装の下塗りとして用いられている。A zinc-rich paint using zinc powder as a pigment is well known as an anticorrosion paint for steel, and is mainly used as an undercoat of the anticorrosion paint.
【０００５】[0005]
【発明が解決しようとする課題】静電塗装の樹脂被膜の
下塗りとしてのジンクリッチペイントは、塗膜強度が十
分でなく、塗膜のヒビ割れ、または、塗膜形成後のダレ
発生のため、厚膜塗装に制限があり、塗膜は最大２５０
μｍ程度である。このために、亜鉛含有量に制限があ
り、使用環境によっては亜鉛の消失速度が大きく、海岸
構造物や地下水が存在する地中構造物などの悪環境では
長期間に渡って防食性能を発揮できない場合がある。The zinc-rich paint used as an undercoat of a resin film for electrostatic coating has insufficient film strength, cracks in the film, or causes dripping after the film is formed. There is a limit to thick film coating, the coating film can be up to 250
It is about μm. For this reason, the zinc content is limited, the rate of zinc loss is large depending on the use environment, and the anticorrosion performance cannot be exhibited for a long time in bad environments such as coastal structures and underground structures where groundwater exists There are cases.
【０００６】そこで、前述のように鋼線に亜鉛メッキに
よる被膜を形成して防錆効果を高めようとしているが、
亜鉛メッキ処理工程において鋼材が４００〜５００℃に
加熱されるため、熱の影響で鋼線の強度が低下するとい
う問題がある。Therefore, as described above, a coating is formed on a steel wire by galvanization to improve the rust prevention effect.
Since the steel material is heated to 400 to 500 ° C. in the galvanizing process, there is a problem that the strength of the steel wire is reduced by the influence of heat.
【０００７】また、鋼線にアルミニウムメッキを施そう
とすると、更にメッキ処理温度は上昇し、７００℃を超
える温度となり、鋼線の強度に対する影響はかなり大き
なものとなり、防錆処理はされているが、肝心の鋼材の
強度が低下するという問題がある。[0007] Further, when an attempt is made to apply aluminum plating to a steel wire, the plating temperature further rises to a temperature exceeding 700 ° C., and the effect on the strength of the steel wire becomes considerably large, so that rust prevention treatment is performed. However, there is a problem that the strength of the important steel material is reduced.
【０００８】この発明は、鋼線や鋼棒に被膜を効率的に
形成することができる静電塗装に適用可能であり、ピン
ホールや傷が生じても防食性能を維持できる塗料を提供
することである。[0008] The present invention is applicable to an electrostatic coating capable of efficiently forming a coating on a steel wire or a steel bar, and provides a coating capable of maintaining the anticorrosion performance even if pinholes or scratches occur. It is.
【０００９】[0009]
【課題を解決するための手段】亜鉛粉末を樹脂バインダ
ーに混合して硬化させ、硬化体を微粉砕することによ
り、静電塗装用の粉体塗料を得た。亜鉛粉末は、５μｍ
以下であることが好ましく、樹脂バインダーとしては、
エポキシ樹脂、ポリエステル樹脂、アクリル樹脂、ウレ
タン樹脂等が使用できる。なかでも、エポキシ樹脂が好
ましい。亜鉛粉末の混合割合は、４０〜６０ｗｔ％が好
ましく、４０ｗｔ％未満では電気化学的防食作用が十分
でなく、また、６０ｗｔ％を超えるとバインダーとして
の樹脂が少なく、静電塗装による被膜形成が旨くいかな
くなる。Means for Solving the Problems Zinc powder was mixed with a resin binder and cured, and the cured product was finely pulverized to obtain a powder coating for electrostatic coating. 5 μm zinc powder
The following is preferable, and as the resin binder,
Epoxy resin, polyester resin, acrylic resin, urethane resin and the like can be used. Of these, epoxy resins are preferred. The mixing ratio of the zinc powder is preferably from 40 to 60 wt%. If the mixing ratio is less than 40 wt%, the electrochemical anticorrosion action is not sufficient. I will not go.
【００１０】亜鉛粉末含有の樹脂硬化体を５０μｍ以下
に粉砕するのが好ましく、大きな粒径の粉体塗料は静電
塗装による被膜形成に好ましくない。亜鉛粉末を含有す
る粉体塗料によって静電塗装をおこなうことにより、メ
ッキに比較して低温である３００℃以下で亜鉛を含む樹
脂被膜を鋼材に形成することができるので、鋼材の強度
を損なうことなく高い防錆効果が得られる。[0010] It is preferable to grind the cured resin containing zinc powder to 50 µm or less, and a powder coating having a large particle size is not preferable for forming a coating film by electrostatic coating. By performing electrostatic coating using a powder coating containing zinc powder, a resin coating containing zinc can be formed on steel at a temperature lower than 300 ° C., which is lower than plating, so that the strength of steel is impaired. High rust prevention effect.
【００１１】[0011]
【実施例１】粒度１〜５μｍの亜鉛粉末４０ｗｔ％とエ
ポキシ樹脂６０ｗｔ％の割合で混合し、ニーダで２７０
〜３００℃で１時間混練りして亜鉛粉末を均一に分散さ
せた。混合体をニーダから取り出して硬化させ、亜鉛粉
末を含有する硬化体を得た。この硬化体をペレタイザー
でペレットにし、更に粉砕機によって粉砕処理し、３０
〜３５μｍの亜鉛粉末を含む静電塗装用粉体塗料を得
た。EXAMPLE 1 A mixture of 40% by weight of zinc powder having a particle size of 1 to 5 μm and 60% by weight of epoxy resin was mixed with a kneader of 270%.
The mixture was kneaded at ~ 300 ° C for 1 hour to uniformly disperse the zinc powder. The mixture was removed from the kneader and cured to obtain a cured product containing zinc powder. The cured product is formed into pellets by a pelletizer, and further crushed by a crusher.
A powder coating for electrostatic coating containing zinc powder of ３５35 μm was obtained.
【００１２】[0012]
【実施例２】粒度１〜５μｍの亜鉛粉末５０ｗｔ％とエ
ポキシ樹脂５０ｗｔ％の割合で混合し、実施例１と同様
のプロセスで亜鉛粉末を含む静電塗装用粉体塗料を得
た。Example 2 A mixture of 50 wt% of zinc powder having a particle size of 1 to 5 μm and 50 wt% of epoxy resin was mixed, and a powder coating for electrostatic coating containing zinc powder was obtained in the same process as in Example 1.
【００１３】[0013]
【実施例３】粒度１〜５μｍの亜鉛粉末５０ｗｔ％とア
クリル樹脂５０ｗｔ％の割合で混合し、実施例１と同様
のプロセスで亜鉛粉末を含む静電塗装用粉体塗料を得
た。Example 3 50% by weight of zinc powder having a particle size of 1 to 5 μm and 50% by weight of an acrylic resin were mixed, and a powder coating for electrostatic coating containing zinc powder was obtained in the same process as in Example 1.
【００１４】この粉体塗料を使用して、静電塗装機でＰ
Ｃ鋼線及び鋼板を２８０℃に加熱し、電圧５０ｋｖで静
電塗装した。更に２００℃で後加熱し、５０μｍの塗膜
を得た。[0014] Using this powder coating, P
C steel wire and steel plate were heated to 280 ° C. and electrostatically coated at a voltage of 50 kv. Further heating was performed at 200 ° C. to obtain a 50 μm coating film.
【００１５】塗膜の物性を試験したところ、伸び率
（％）は１３０〜１５０、硬さ（Ｈ）は２〜３であり、
耐熱性試験では２５５℃を超えたところで塗膜が黒色に
変化した。また、耐候性試験及び塩水噴霧試験に対して
異常は認められなかった。When the physical properties of the coating film were tested, the elongation (%) was 130 to 150 and the hardness (H) was 2 to 3,
In the heat resistance test, the coating film turned black when the temperature exceeded 255 ° C. No abnormality was observed in the weather resistance test and the salt spray test.
【００１６】[0016]
【発明の効果】亜鉛粉末を樹脂に混合して硬化させたも
のを粉砕することにより、電気化学的防錆機能を有する
粉体塗料を得ることができる。静電塗装はメッキ処理に
比較して低温で被膜を形成することができ、鋼材に熱影
響を与えることがないので鋼材の強度を損なうことなく
防錆被膜を効率的に形成することができる。被膜形成に
おいて避けられないピンホールや作業中に被膜に傷が生
じても、亜鉛の電気化学的防食作用が長期間に渡って発
揮され、地中や海中など苛酷な環境においても防錆効果
が消失することがない。According to the present invention, a powder coating having an electrochemical rust-preventing function can be obtained by pulverizing a mixture obtained by mixing zinc powder with a resin and curing the mixture. The electrostatic coating can form a film at a lower temperature than the plating process and does not affect the steel material by heat, so that a rust-preventive film can be efficiently formed without impairing the strength of the steel material. Even if pinholes are inevitable in forming the film or if the film is damaged during work, zinc's electrochemical anticorrosion action is exhibited over a long period of time, and the rust prevention effect is maintained even in harsh environments such as underground and underwater. It does not disappear.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｃ０９Ｄ 5/03 Ｃ０９Ｄ 5/03 133/00 133/00 163/00 163/00 167/00 167/00 175/04 175/04 Ｆターム(参考） 4D075 AA01 CA33 DB02 4F100 AB03A AB18B AB18H AK01B AK25B AK41B AK51B AK53B BA02 CA15B DA16 DE01B DE01H GB90 JB02 YY00B 4J038 CG001 CG141 DB001 DD001 DG001 HA066 KA08 MA02 NA03 PA03 PA19 PB05 PC02────────────────────────────────────────────────── ─── of the front page continued (51) Int.Cl. 7 identification mark FI theme Court Bu (reference) C09D 5/03 C09D 5/03 133/00 133/00 163/00 163/00 167/00 167/00 175 / 04 175/04 F term (reference) 4D075 AA01 CA33 DB02 4F100 AB03A AB18B AB18H AK01B AK25B AK41B AK51B AK53B BA02 CA15B DA16 DE01B DE01H GB90 JB02 YY00B 4J038 CG001 CG141 DB03 DD001 DG19 HA03
Claims (5)
させ、硬化体を微粉砕する静電塗装用粉体塗料の製造方
法。1. A method for producing a powder coating for electrostatic coating in which zinc powder is mixed with a resin binder and cured, and the cured product is finely pulverized.
ポリエステル樹脂、アクリル樹脂、またはウレタン樹脂
のいずれかである静電塗装用粉体塗料の製造方法。2. The method according to claim 1, wherein the resin is an epoxy resin,
A method for producing a powder coating for electrostatic coating, which is a polyester resin, an acrylic resin, or a urethane resin.
０〜６０ｗｔ％含有されている静電塗装用粉体塗料の製
造方法。3. The method according to claim 1, wherein the zinc powder comprises
A method for producing a powder coating for electrostatic coating containing 0 to 60 wt%.
造された静電塗装用粉体塗料。4. A powder coating for electrostatic coating produced by the method according to claim 1.
粉体塗料で静電塗装された鋼材。5. A steel material electrostatically coated with the powder coating obtained by the method according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001008340A JP2002212508A (en) | 2001-01-16 | 2001-01-16 | Method for producing powdered coating, powdered coating and anticorrosion-treated steel material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001008340A JP2002212508A (en) | 2001-01-16 | 2001-01-16 | Method for producing powdered coating, powdered coating and anticorrosion-treated steel material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002212508A true JP2002212508A (en) | 2002-07-31 |
Family
ID=18875972
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001008340A Pending JP2002212508A (en) | 2001-01-16 | 2001-01-16 | Method for producing powdered coating, powdered coating and anticorrosion-treated steel material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2002212508A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007129393A1 (en) * | 2006-04-25 | 2007-11-15 | Togo Seisakusyo Corporation | Anticorrosive metal part and process for producing the same |
| KR100816522B1 (en) | 2006-12-21 | 2008-03-24 | (주)디피아이 홀딩스 | Aqueous anti-corrosive paint and method of forming paint layer using the same |
| EP2014725A1 (en) * | 2007-07-10 | 2009-01-14 | Sika Technology AG | Cathodic corrosion protection for reinforcing ferroconcrete structures |
| JP2010121048A (en) * | 2008-11-20 | 2010-06-03 | Akebono Brake Ind Co Ltd | Powder coating material and powder coating method |
| KR101382488B1 (en) | 2014-01-09 | 2014-04-10 | (주)에스시아이 | Method for manufacturing corrosion inhibition type orsconductive coating agent |
-
2001
- 2001-01-16 JP JP2001008340A patent/JP2002212508A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007129393A1 (en) * | 2006-04-25 | 2007-11-15 | Togo Seisakusyo Corporation | Anticorrosive metal part and process for producing the same |
| JPWO2007129393A1 (en) * | 2006-04-25 | 2009-09-17 | 株式会社東郷製作所 | Rust-proof metal parts and manufacturing method thereof |
| US8080321B2 (en) | 2006-04-25 | 2011-12-20 | Togo Seisakusyo Corporation | Rust-preventive metallic component part |
| KR100816522B1 (en) | 2006-12-21 | 2008-03-24 | (주)디피아이 홀딩스 | Aqueous anti-corrosive paint and method of forming paint layer using the same |
| EP2014725A1 (en) * | 2007-07-10 | 2009-01-14 | Sika Technology AG | Cathodic corrosion protection for reinforcing ferroconcrete structures |
| WO2009007413A1 (en) * | 2007-07-10 | 2009-01-15 | Sika Technology Ag | Cathode corrosion protection for reinforcements of reinforced concrete structures |
| JP2010121048A (en) * | 2008-11-20 | 2010-06-03 | Akebono Brake Ind Co Ltd | Powder coating material and powder coating method |
| KR101382488B1 (en) | 2014-01-09 | 2014-04-10 | (주)에스시아이 | Method for manufacturing corrosion inhibition type orsconductive coating agent |
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