JP2935589B2 - Coating method of polyolefin sprayed heavy corrosion protection coated steel - Google Patents
Coating method of polyolefin sprayed heavy corrosion protection coated steelInfo
- Publication number
- JP2935589B2 JP2935589B2 JP16840191A JP16840191A JP2935589B2 JP 2935589 B2 JP2935589 B2 JP 2935589B2 JP 16840191 A JP16840191 A JP 16840191A JP 16840191 A JP16840191 A JP 16840191A JP 2935589 B2 JP2935589 B2 JP 2935589B2
- Authority
- JP
- Japan
- Prior art keywords
- polyolefin
- coating
- steel material
- sprayed
- 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.)
- Expired - Lifetime
Links
Description
【０００１】[0001]
【産業上の利用分野】本発明は、鋼材の防食被覆の１つ
であるポリオレフィン溶射による重防食被覆鋼材の被覆
方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for coating a heavy corrosion protection coated steel material by polyolefin spraying, which is one of the corrosion protection coatings for steel material.
【０００２】[0002]
【従来の技術】鋼材への防食被覆材料の１つにポリオレ
フィン系樹脂がある。ポリオレフィン系樹脂は他の塗料
系に比べ、塗膜性能、絶縁抵抗を初めとする防食性が遥
かに優れている。そのポリオレフィン系樹脂の鋼材への
被覆方法として押し出し被覆、シート貼り付け、流動浸
漬、静電粉体塗装等があるが、それぞれ次のような制約
がある。押し出し被覆、シート貼り付けは複雑形状物へ
の被覆が不可能、流動浸漬は予熱に高温を要しかつ加熱
炉の大きさ、コスト等により被覆鋼材の寸法が制約され
る。静電粉体塗装は薄膜塗装であり厚膜塗装には適さな
い。以上の理由で、複雑形状物の重防食被覆はウレタン
塗料等で対応している。これらを解決するため、近年プ
ラスチック溶射装置が開発されポリオレフィン系樹脂の
溶射被覆もおこなわれるようになった。2. Description of the Related Art Polyolefin resins are one of the anticorrosion coating materials for steel. Polyolefin-based resins are far superior to other paint systems in coating performance and corrosion resistance, including insulation resistance. There are extrusion coating, sheet sticking, fluid immersion, electrostatic powder coating, and the like as methods for coating the polyolefin-based resin on steel, but each has the following restrictions. Extrusion coating and sheet sticking do not allow coating of complex shapes. Fluid immersion requires high temperatures for preheating, and the size of the coated steel material is limited by the size and cost of the heating furnace. Electrostatic powder coating is a thin film coating and is not suitable for thick film coating. For the above reasons, the heavy-duty anticorrosion coating of a complex-shaped object is supported by urethane paint or the like. In order to solve these problems, a plastic spraying apparatus has recently been developed, and a thermal spray coating of a polyolefin resin has been performed.
【０００３】しかし、溶射被覆は鋼材を予熱しておかな
ければならないという問題があった。それに対して特公
平２−２２７１０号公報のように鋼材の予熱をせずに溶
射被覆を行う方法が開発されたが、押し出し被覆等と比
較して鋼材と被覆材料との密着力がかなり小さい、
溶射時の劣化により被覆材料の引張強度、ＥＳＣＲ（耐
ストレスクラッキング性）等の物性が劣る、という問題
があった。However, the thermal spray coating has a problem that the steel material must be preheated. On the other hand, a method of performing thermal spray coating without preheating the steel material has been developed as in Japanese Patent Publication No. 22710/1990, but the adhesion between the steel material and the coating material is considerably smaller than that of the extrusion coating or the like.
There has been a problem that physical properties such as tensile strength and ESCR (stress cracking resistance) of the coating material are deteriorated due to deterioration during thermal spraying.
【０００４】[0004]
【発明が解決しようとする課題】このようにポリオレフ
ィン樹脂を予熱せずに溶射すると重防食被覆として充分
な性能が得られないという問題があった。まず鋼材とポ
リオレフィン樹脂との密着性の問題であるが、予熱無し
の溶射では予熱有りと比較して、溶射時にポリオレフィ
ン樹脂に与えられる熱量が少なくポリオレフィン樹脂の
濡れ性が不充分になりやすいために密着力が不充分であ
ると考えられる。それに対して、濡れ性の良いポリオレ
フィン樹脂を溶射するという方法が考えられるが、濡れ
性の良いポリオレフィン樹脂は一般に低分子量で物性が
低く、更に溶射時の劣化を考慮すると重防食被覆として
充分な物性を確保できない。As described above, when the polyolefin resin is sprayed without preheating, there is a problem that sufficient performance as a heavy duty anticorrosion coating cannot be obtained. First, there is the problem of adhesion between the steel material and the polyolefin resin.However, in the case of thermal spraying without preheating, the amount of heat given to the polyolefin resin at the time of thermal spraying is smaller than that with preheating, and the wettability of the polyolefin resin tends to be insufficient. It is considered that the adhesion was insufficient. On the other hand, a method of spraying a polyolefin resin with good wettability is conceivable, but a polyolefin resin with good wettability is generally low in molecular weight and has low physical properties. Cannot be secured.
【０００５】以上に対し本発明では、予熱無しの溶射で
も重防食被覆として充分な密着力と物性を持つポリオレ
フィン被覆鋼材を提供することを目的としている。In view of the above, an object of the present invention is to provide a polyolefin-coated steel material having sufficient adhesion and physical properties as a heavy-duty anticorrosive coating even without thermal spraying without preheating.
【０００６】[0006]
【課題を解決するための手段】すなわち本発明は、鋼材
に前処理を施しエポキシ系プライマーもしくはウレタン
系プライマーを塗布し該プライマー層が指触硬化する前
に接着性ポリオレフィン粉体をプライマー層上にエアー
吹き付け等により付着させ、前記プライマー層が硬化後
にプライマー層上に付着させた接着性ポリオレフィン粉
体上にポリオレフィン粉体もしくは接着性ポリオレフィ
ン粉体を溶射することを特徴とするポリオレフィン溶射
重防食被覆鋼材の被覆方法である。In other words, the present invention provides a steel material which is pre-treated and coated with an epoxy-based primer or a urethane-based primer, and the adhesive polyolefin powder is coated on the primer layer before the primer layer hardens to the touch. A polyolefin sprayed heavy corrosion protection coated steel material characterized by spraying a polyolefin powder or an adhesive polyolefin powder onto the adhesive polyolefin powder deposited on the primer layer after the primer layer has been cured by air blowing or the like. Is a coating method.
【０００７】以下、詳細に記述する。The details will be described below.
【０００８】図１は、本発明によって得られるポリオレ
フィン溶射重防食被覆鋼材の被覆構成図である。鋼材１
にグリットブラスト、ショットブラスト、サンドブラス
ト等の前処理を施した後、プライマー層２を膜厚１０〜
１００μｍ形成させる。プライマー層２としては、ポリ
オレフィンと鋼材との密着性の良いものであれば特に限
定はないが、耐水密着性を考慮すると、エポキシ系プラ
イマーもしくはウレタン系プライマーが望ましい。プラ
イマー層２が指触硬化する前に、図２に示すように接着
性ポリオレフィン粉体５をエアー吹き付け等にてプライ
マー層２上に付着させる。この接着性ポリオレフィン粉
体５は、図２に示すようにプライマー層２の上部に微小
な凹凸を生じさせポリオレフィン溶射実施後、自らが形
成する接着性ポリオレフィン層３とプライマー層２との
接触面積を大きくして接着力を高める。また接着性ポリ
オレフィン粉体５はプライマー層２の上部にごく薄く付
着させるのが良く、過剰に付着している粉体はプライマ
ー層２が硬化した後、エアーブロー等にて除去するのが
良い。接着性ポリオレフィン粉体５としては接着性を示
すようにポリオレフィンに充分な変性が施してあれば特
に限定はないが、プライマー層２との濡れ性を考慮する
と一般にはＭＩ（メルトインデックス）が大きい方が接
着力が強くなる。プライマー層２が硬化した後、ポリオ
レフィンを溶射しポリオレフィン溶射層４を形成させ
る。溶射に用いるポリオレフィン粉体としては、溶射火
炎による劣化を防止するために適切な酸化防止剤を含有
し、ポリオレフィン溶射層４を形成した後重防食被覆と
して充分な性能を示すものであれば特に限定はない。ま
た重防食被覆としての性能を満足すればポリオレフィン
溶射層４に接着性ポリオレフィンを用いてもかまわな
い。ポリオレフィン溶射層４を溶射時に、プライマー層
２上に付着しているポリオレフィン粉体５は、溶射火炎
の接触及びポリオレフィン溶射粉体のもつ熱の伝達によ
り溶融しプライマー層２と充分に密着する。また同時に
ポリオレフィン溶射層４とも充分に密着することはいう
までもない。ポリオレフィン溶射層４の溶射条件は特に
限定はないが、空気とプロパンガスとの混合ガスによっ
て炎を燃焼させ、溶射火炎の中に冷却エアーゾーンを設
けた粉体溶射装置（特公昭６３−３１７１９）を用いた
場合、 （ａ）燃焼空気圧／プロパンガス圧＝２．０〜５．０
好ましくは３．０〜４．０ （ｂ）冷却空気圧／プロパンガス圧＝２．０〜６．０
好ましくは４．０〜５．５ （ｃ）（燃焼空気圧＋冷却空気圧）／プロパンガス圧＝
５．０〜１０．０ 好ましくは７．０〜９．０ （ｄ）ノズル先端から鋼材までの距離＝３００〜１００
０ｍｍ 好ましくは５００〜８００ｍｍ （ｅ）粉体吐出量＝１００〜３００ｇ／ｍｉｎ の条件を満たすのが望ましい。FIG. 1 is a diagram showing a coating structure of a polyolefin sprayed heavy corrosion protection coated steel material obtained by the present invention. Steel material 1
After pre-treatment such as grit blasting, shot blasting and sand blasting, the primer layer 2 is
100 μm is formed. The primer layer 2 is not particularly limited as long as it has good adhesion between the polyolefin and the steel material, but an epoxy-based primer or a urethane-based primer is preferable in consideration of water-resistant adhesion. Before the primer layer 2 hardens to the touch, an adhesive polyolefin powder 5 is adhered to the primer layer 2 by air blowing or the like as shown in FIG. As shown in FIG. 2, the adhesive polyolefin powder 5 generates fine irregularities on the top of the primer layer 2, and after performing polyolefin spraying, reduces the contact area between the adhesive polyolefin layer 3 and the primer layer 2 formed by itself. Enlarge to increase adhesion. The adhesive polyolefin powder 5 is preferably attached very thinly to the upper part of the primer layer 2, and the excessively attached powder is preferably removed by air blow or the like after the primer layer 2 is cured. The adhesive polyolefin powder 5 is not particularly limited as long as the polyolefin is sufficiently modified so as to exhibit adhesiveness. However, in consideration of wettability with the primer layer 2, in general, the larger the MI (melt index), the better. However, the adhesive strength becomes stronger. After the primer layer 2 is cured, the polyolefin is sprayed to form a polyolefin sprayed layer 4. The polyolefin powder used for thermal spraying is not particularly limited as long as it contains an appropriate antioxidant to prevent deterioration due to thermal spray flame, and shows sufficient performance as a heavy corrosion protection coating after forming polyolefin thermal spray layer 4. There is no. If the performance as a heavy-duty anticorrosion coating is satisfied, an adhesive polyolefin may be used for the polyolefin sprayed layer 4. When the polyolefin sprayed layer 4 is sprayed, the polyolefin powder 5 adhering to the primer layer 2 is melted by the contact of the spray flame and the transfer of the heat of the polyolefin sprayed powder, and adheres sufficiently to the primer layer 2. At the same time, it goes without saying that the polyolefin sprayed layer 4 is sufficiently adhered. The thermal spraying conditions of the polyolefin thermal spray layer 4 are not particularly limited, but a powder thermal spraying apparatus in which a flame is burned by a mixed gas of air and propane gas and a cooling air zone is provided in the thermal spray flame (JP-B-63-31719) (A) Combustion air pressure / propane gas pressure = 2.0 to 5.0
Preferably 3.0-4.0 (b) cooling air pressure / propane gas pressure = 2.0-6.0
Preferably 4.0 to 5.5 (c) (combustion air pressure + cooling air pressure) / propane gas pressure =
5.0 to 10.0, preferably 7.0 to 9.0 (d) Distance from nozzle tip to steel material = 300 to 100
0 mm, preferably 500 to 800 mm (e) It is desirable to satisfy the condition of powder discharge amount = 100 to 300 g / min.
【０００９】燃焼空気圧、冷却空気圧、プロパンガス圧
のバランスが取れていないと安定した火炎を形成するこ
とができない。またポリオレフィンの酸化劣化を抑える
ために、冷却空気の代わりに窒素等を用いてもかまわな
い。If the combustion air pressure, cooling air pressure, and propane gas pressure are not balanced, a stable flame cannot be formed. Nitrogen or the like may be used in place of the cooling air in order to suppress the oxidative deterioration of the polyolefin.
【００１０】本方法によって得られるポリオレフィン溶
射重防食被覆鋼材は、プライマー層上に付着させた接着
性ポリオレフィン層３により鋼材とポリオレフィンの密
着力を確保しポリオレフィン溶射層４により物性を確保
することにより、鋼材とポリオレフィン層との密着力及
びポリオレフィン層の物性に優れ、重防食被覆として充
分な性能を持つものである。[0010] The polyolefin sprayed heavy corrosion protection coated steel material obtained by the present method is obtained by securing the adhesion between the steel material and the polyolefin by the adhesive polyolefin layer 3 attached on the primer layer and securing the physical properties by the polyolefin sprayed layer 4. It has excellent adhesion between the steel material and the polyolefin layer and physical properties of the polyolefin layer, and has sufficient performance as a heavy-duty anticorrosion coating.
【００１１】[0011]
【実施例】以下、実施例により本発明を具体的に説明す
るが、本発明の範囲は、これらの実施例に限定されるも
のではない。The present invention will be described below in more detail with reference to examples, but the scope of the present invention is not limited to these examples.
【００１２】鋼板（１５０×７５×９ｍｍ）にグリット
ブラスト後、第１表の実施例及び比較例に示すようにエ
ポキシ系プライマーもしくはウレタン系プライマーを膜
厚３０μｍに塗布し、実施例ではプライマーが指触硬化
する前に第１表に示す接着性ポリエチレン粉体をエアー
ガンにて吹き付けて付着させた。また比較例では接着性
ポリエチレン粉体をプライマーに付着させずプライマー
のままとした。プライマーが硬化後、第１表に示す接着
性ポリエチレン粉体を膜厚２．５ｍｍに溶射した。溶射
方法は、空気とプロパンガスとの混合ガスによって炎を
燃焼させ、溶射火炎の中に冷却エアーゾーンを設けた粉
体溶射装置（小野田セメント（株）製、ＣＴ−３００）
を用い、 （１）燃焼空気圧＝１．５ｋｇ／ｃｍ2 （２）プロパン圧＝０．４０〜０．４５ｋｇ／ｃｍ2 （３）冷却空気圧＝１．５０〜２．００ｋｇ／ｃｍ2 （４）粉体吐出量＝２００ｇ／ｍｉｎ （５）ノズル距離＝５００〜７００ｍｍ の条件にて溶射した。After grit blasting on a steel plate (150 × 75 × 9 mm), an epoxy-based primer or a urethane-based primer is applied to a thickness of 30 μm as shown in Examples and Comparative Examples in Table 1, and in this example, the primer is a finger. Before the contact hardening, the adhesive polyethylene powder shown in Table 1 was sprayed with an air gun to adhere. In the comparative example, the adhesive polyethylene powder was not attached to the primer, and was left as it was. After the primer was cured, the adhesive polyethylene powder shown in Table 1 was sprayed to a thickness of 2.5 mm. The thermal spraying method is a powder thermal spraying apparatus in which a flame is burned by a mixed gas of air and propane gas, and a cooling air zone is provided in the thermal spray flame (CT-300, manufactured by Onoda Cement Co., Ltd.).
(1) combustion air pressure = 1.5 kg / cm 2 (2) propane pressure = 0.40-0.45 kg / cm 2 (3) cooling air pressure = 1.50-2.00 kg / cm 2 (4) Powder discharge amount = 200 g / min (5) Nozzle distance = 500 to 700 mm.
【００１３】以上の条件にて得られた試験片についてピ
ール強度を測定した。また、６０℃６０日温水浸漬及び
６０℃、６０日塩水浸漬を実施した後の試験片について
もピール強度を測定した。The test pieces obtained under the above conditions were measured for peel strength. Further, the peel strength of the test piece after immersion in warm water at 60 ° C. for 60 days and immersion in salt water at 60 ° C. for 60 days was also measured.
【００１４】表１より、実施例は良好な密着力を示すの
に対し、比較例では密着力が極めて低いことがわかる。
また実施例の中でもプライマー層上に付着させるポリエ
チレン粉体のＭＩが高い方が密着力が高く、より効果的
であることがわかる。From Table 1, it can be seen that the examples show good adhesion, while the comparative examples have extremely low adhesion.
In addition, it can be seen that among the examples, the higher the MI of the polyethylene powder to be adhered on the primer layer, the higher the adhesion, and the more effective it is.
【００１５】[0015]
【表１】 [Table 1]
【００１６】[0016]
【発明の効果】本発明により、予熱無しの溶射でも重防
食被覆として充分な性能を持つポリオレフィン溶射被覆
が可能となり、複雑形状のポリオレフィン被覆鋼材が得
られるようになった。According to the present invention, a polyolefin sprayed coating having sufficient performance as a heavy-duty anticorrosive coating can be obtained even by thermal spraying without preheating, and a polyolefin-coated steel material having a complicated shape can be obtained.
【図１】本発明のポリオレフィン溶射被覆鋼材の被覆方
法によって得られるポリオレフィン溶射被覆鋼材の被覆
構成図。FIG. 1 is a diagram showing the coating configuration of a polyolefin spray-coated steel material obtained by the method for coating a polyolefin spray-coated steel material of the present invention.
【図２】本発明のポリオレフィン溶射被覆鋼材の被覆方
法において接着性ポリオレフィン粉体をプライマー層に
付着させた状態の断面図。FIG. 2 is a cross-sectional view showing a state in which an adhesive polyolefin powder is adhered to a primer layer in the method for coating a polyolefin spray-coated steel material of the present invention.
１…鋼材 ２…プライマー層 ３…接着性ポリオレフィン層 ４…ポリオレフィ
ン溶射層 ５…接着性ポリオレフィン粉体DESCRIPTION OF SYMBOLS 1 ... Steel material 2 ... Primer layer 3 ... Adhesive polyolefin layer 4 ... Polyolefin sprayed layer 5 ... Adhesive polyolefin powder
Claims (1)
ーもしくはウレタン系プライマーを塗布し該プライマー
層が指触硬化する前に接着性ポリオレフィン粉体をプラ
イマー層上にエアー吹き付け等により付着させ、前記プ
ライマー層が硬化後にプライマー層上に付着させた接着
性ポリオレフィン粉体上にポリオレフィン粉体もしくは
接着性ポリオレフィン粉体を溶射することを特徴とする
ポリオレフィン溶射重防食被覆鋼材の被覆方法。1. A steel material is subjected to a pretreatment, an epoxy-based primer or a urethane-based primer is applied, and an adhesive polyolefin powder is adhered to the primer layer by air spraying or the like before the primer layer is cured by finger touch. A method for coating a polyolefin-sprayed heavy corrosion protection-coated steel material, comprising spraying a polyolefin powder or an adhesive polyolefin powder on an adhesive polyolefin powder adhered onto a primer layer after the layer is cured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16840191A JP2935589B2 (en) | 1991-07-09 | 1991-07-09 | Coating method of polyolefin sprayed heavy corrosion protection coated steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16840191A JP2935589B2 (en) | 1991-07-09 | 1991-07-09 | Coating method of polyolefin sprayed heavy corrosion protection coated steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0515835A JPH0515835A (en) | 1993-01-26 |
| JP2935589B2 true JP2935589B2 (en) | 1999-08-16 |
Family
ID=15867439
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16840191A Expired - Lifetime JP2935589B2 (en) | 1991-07-09 | 1991-07-09 | Coating method of polyolefin sprayed heavy corrosion protection coated steel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2935589B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105710020A (en) * | 2016-04-01 | 2016-06-29 | 蚌埠市莱特汽车配件有限公司 | Spraying technology for surface of shell of air filter of automobile |
-
1991
- 1991-07-09 JP JP16840191A patent/JP2935589B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0515835A (en) | 1993-01-26 |
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