JPH0480029A - Plastic-coated steel pipe and manufacture thereof - Google Patents
Plastic-coated steel pipe and manufacture thereofInfo
- Publication number
- JPH0480029A JPH0480029A JP2193843A JP19384390A JPH0480029A JP H0480029 A JPH0480029 A JP H0480029A JP 2193843 A JP2193843 A JP 2193843A JP 19384390 A JP19384390 A JP 19384390A JP H0480029 A JPH0480029 A JP H0480029A
- Authority
- JP
- Japan
- Prior art keywords
- layer
- steel pipe
- plastic
- coated steel
- colored
- 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.)
- Granted
Links
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
- Laminated Bodies (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、プラスチック被覆鋼管及びその製造方法に関
する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a plastic-coated steel pipe and a method for manufacturing the same.
従来、用途の識別や景観の美観を保つために、着色処理
が施されたプラスチック被覆鋼管か使用されている。こ
のようなプラスチック被覆鋼管の着色処理は、例えば、
着色顔料を練り込んだ被覆材料を溶融して鋼管本体上に
押出被覆し、着色されたプラスチック被覆層を被着させ
ている。Conventionally, colored plastic-coated steel pipes have been used to identify the purpose and to maintain the aesthetic appearance of the landscape. Coloring treatment for such plastic-coated steel pipes includes, for example,
A coating material kneaded with colored pigments is melted and extruded onto the steel pipe body, and a colored plastic coating layer is applied.
しかしながら、着色されたプラスチック被覆層は、耐候
性か劣るため、定期的に保守管理する必要がある。また
、被覆層全体に着色顔料を練り込んでいるので製造コス
トが高い。しかも、このようなプラスチック被覆鋼管の
製造では、色の変更をする場合、押出機内に残留した被
覆原料を全て排出しなければならず、押出機内の清掃に
多くの手間を要する。また、−互着色した被覆原料は、
廃棄しなければならないので、樹脂原料の損失にっなか
る。However, the colored plastic coating layer has poor weather resistance and requires regular maintenance. Furthermore, since the colored pigment is mixed into the entire coating layer, the manufacturing cost is high. Moreover, in the production of such plastic-coated steel pipes, when changing the color, all the coating material remaining in the extruder must be discharged, and cleaning the inside of the extruder requires a lot of effort. In addition, - the mutually colored coated raw materials are
Since it has to be disposed of, there is no loss of resin raw material.
本発明は、かかる点に鑑みてなされたものであり、保守
管理の必要か殆ど無く、且つ製造コストを低減できるプ
ラスチック被覆鋼管及びその製造方法を提供するもので
ある。The present invention has been made in view of these points, and provides a plastic-coated steel pipe and a method for manufacturing the same, which require almost no maintenance and management and can reduce manufacturing costs.
（、？［を解決するための手段］
本発明は、鋼管本体の外周面上に形成された下地層と、
該下地層上に設けられた接着層と、該接着層上に被着さ
れた防食層と、所定の色を有し、且つ、酸化防止剤を０
．１重量％以上、耐候性安定剤を０，３重量％以上含有
して、前記防食層上に融着された着色防食層とを具備す
ることを特徴とするプラスチック被覆鋼管である。(, ? [Means for solving the problem] The present invention provides a base layer formed on the outer peripheral surface of a steel pipe body,
The adhesive layer provided on the base layer and the anticorrosion layer coated on the adhesive layer have a predetermined color and contain no antioxidant.
．． The plastic-coated steel pipe is characterized in that it contains a weathering stabilizer of 0.3% by weight or more and a colored anticorrosion layer fused onto the anticorrosion layer.
本発明は、鋼管本体の周面上に下地層を形成する工程と
、該下地層の周面上に接着層を介して防食層を被着させ
る工程と、該防食層の外面温度を７０℃以上に設定する
工程と、所定の色を有し、且つ、酸化防止剤を０，１重
量％以上、耐候性安定剤を０．３重量％以上含有した着
色防食層を前記防食層上に押出被覆して融着させる工程
とを具備することを特徴とするプラスチック被覆鋼管の
製造方法である。The present invention includes a step of forming a base layer on the circumferential surface of a steel pipe body, a step of depositing a corrosion protection layer on the circumference of the base layer via an adhesive layer, and a step of increasing the outer surface temperature of the corrosion protection layer to 70°C. A colored anti-corrosion layer having a predetermined color and containing at least 0.1% by weight of an antioxidant and at least 0.3% by weight of a weathering stabilizer is extruded onto the anti-corrosion layer. This is a method for manufacturing a plastic-coated steel pipe, comprising the steps of coating and fusing.
本発明のプラスチック被覆鋼管によれば、所定の色に着
色され、且つ所定量の酸化防止剤及び耐候性安定剤を含
有する着色防食層か最外層に設けられている。これによ
り、プラスチック被覆の耐候性を高めることかできる。According to the plastic-coated steel pipe of the present invention, the outermost layer is provided with a colored anticorrosion layer that is colored in a predetermined color and contains a predetermined amount of an antioxidant and a weathering stabilizer. This can improve the weather resistance of the plastic coating.
このため、プラスチック被覆鋼管の寿命を大幅に延長で
き、保守管理か容易になる。また、最外層の着色防食層
のみを着色すれば足りるので、必要な着色顔料の量を低
減できる。Therefore, the lifespan of plastic-coated steel pipes can be greatly extended and maintenance management becomes easier. Furthermore, since it is sufficient to color only the outermost colored anticorrosion layer, the amount of necessary colored pigment can be reduced.
また、本発明のプラスチック被覆鋼管の製造方法によれ
ば、着色防食層を、外面温度か７０℃以上に設定された
防食層上に押出被覆して、両防食層同士を一体に融着さ
せている。これにより、両防食層間の密着性に優れたプ
ラスチック被覆鋼管を容易に製造できる。Further, according to the method for manufacturing a plastic-coated steel pipe of the present invention, the colored anti-corrosion layer is extruded and coated on the anti-corrosion layer whose outer surface temperature is set to 70°C or higher, and both anti-corrosion layers are fused together. There is. Thereby, a plastic-coated steel pipe with excellent adhesion between both anti-corrosion layers can be easily manufactured.
以下、本発明の実施例について、図面を参照して詳細に
説明する。Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
第１図は、本発明の一実施例のプラスチック被覆鋼管の
要部を示す説明図である。FIG. 1 is an explanatory diagram showing the main parts of a plastic-coated steel pipe according to an embodiment of the present invention.
図中１は、鋼管本体である。鋼管本体１の外周面上には
、下地層としてクロメート層２が形成されている。下地
層には、クロメート層２以外にも、ブライマー等が使用
できる。クロメート層２の周面上には、接着層３を介し
て厚さ約１．０１の防食層４か被着されている。接着層
３は、例えば、接着性ポリエチレン樹脂で形成されてい
る。また、防食層４は、未着色のポリエチレン樹脂で形
成されている。防食層４上には、厚さ約０．４ｍ＋１の
着色防食層５が融着されている。着色防食層５は、約１
重量％の着色顔料、約０．１５重量％の酸化防止剤、約
０．２重量％の耐候性安定剤を含有するポリエチレン樹
脂で形成されている。酸化防止剤としては、例えば、フ
ェノール系安定剤としては、ジ−オルソ−クレゾールプ
ロパン、２−２゛−メチレンビス（４−メチル−６−タ
ーシャルブチルフェノール）等を、アミン系安定剤とし
てはＮ−Ｎ−ジ−β−ナフトール−パラフェニレンジア
ミン等を使用することかできる。また、耐候性安定剤と
しては、例えば、ヘンシフエノン系耐候性安定剤として
は２−４ジオキソベンゾフエノン、２−４−４’−トリ
オキシヘンシフエノンを、ベンゾフェノンのアルコキシ
誘導体としては２−オキシ−４−４°−メトキシヘンシ
フエノン、２−２’−ジオキシ−４−ブトキシベンゾフ
ェノン等を使用することかできる。1 in the figure is the steel pipe body. A chromate layer 2 is formed on the outer peripheral surface of the steel pipe body 1 as a base layer. In addition to the chromate layer 2, a brimer or the like can be used as the base layer. On the circumferential surface of the chromate layer 2, an anti-corrosion layer 4 having a thickness of about 1.0 mm is applied via an adhesive layer 3. The adhesive layer 3 is made of adhesive polyethylene resin, for example. Moreover, the anticorrosion layer 4 is formed of uncolored polyethylene resin. A colored anti-corrosion layer 5 having a thickness of about 0.4 m+1 is fused onto the anti-corrosion layer 4. The colored anticorrosive layer 5 has a thickness of about 1
It is formed from a polyethylene resin containing % by weight colored pigment, about 0.15% by weight antioxidant, and about 0.2% by weight weathering stabilizer. Examples of antioxidants include phenolic stabilizers such as di-ortho-cresolpropane and 2-2'-methylenebis(4-methyl-6-tert-butylphenol), and amine stabilizers such as N- N-di-β-naphthol-paraphenylenediamine and the like can be used. In addition, examples of weathering stabilizers include 2-4 dioxobenzophenone and 2-4-4'-trioxyhensiphenone as hensifhenone-based weathering stabilizers, and 2-4-dioxobenzophenone and 2-4-4'-trioxyhensiphenone as alkoxy derivatives of benzophenone Oxy-4-4°-methoxyhensiphenone, 2-2'-dioxy-4-butoxybenzophenone, etc. can be used.
このように構成されたプラスチック被覆鋼管６について
以下に示す引張り伸び残率を調べた。なお、この試験で
は、下記第１表に示す組成で、顔料、酸化防止剤、耐候
性安定剤を含有する着色防食層を有するプラスチック被
覆鋼管６を用いた。The tensile elongation retention rate shown below for the plastic-coated steel pipe 6 constructed in this way was investigated. In this test, a plastic-coated steel pipe 6 having a composition shown in Table 1 below and having a colored anticorrosion layer containing a pigment, an antioxidant, and a weatherability stabilizer was used.
着色防食層の酸化防止剤には、２−２−メチレンビス（
４−メチル−６−ターシャルブチルフェノール）、耐候
性安定剤には、２−４−４’−）リオキシヘンゾフエノ
ンを使用した。また、試験検体２〜５のグリーン（Ａ）
〜（Ｄ）の顔料には、フタ口シアニングリーン、試験検
体６のブラックの顔料としては、カーボンブラックを使
用した。The antioxidant for the colored anti-corrosion layer is 2-2-methylenebis(
4-methyl-6-tert-butylphenol) and 2-4-4'-)lyoxyhenzophenone were used as the weathering stabilizer. In addition, green (A) of test specimens 2 to 5
As the pigment for ~(D), lid cyanine green was used, and as the black pigment for test specimen 6, carbon black was used.
第
表
各種試験検体１〜６に、０〜５０００時間にわたり、ウ
エーザロメーターにより、紫外線を照射し、定時間ごと
に着色防食層の引張り伸び残率（％）を測定した。これ
らの測定結果は、第２図に示す通りである。ここで、第
２図中、特性線Ｉは、試験検体１（ナチュラル）の引張
り伸び残率特性を示す。同様に、特性線■は、試験検体
２ （グリシ（Ａ））、特性線■は、試験検体３ （グ
リーン（Ｂ））、特性線■は、試験検体４ （グリーン
（Ｃ））、特性線■は、試験検体５ （グリーン（Ｄ）
）、特性線■は、試験検体６（ブラック）の引張り伸び
残率特性をそれぞれ示す。Various test specimens 1 to 6 in Table 1 were irradiated with ultraviolet rays using a weatherometer for 0 to 5000 hours, and the residual tensile elongation (%) of the colored anticorrosion layer was measured at regular intervals. The results of these measurements are shown in FIG. Here, in FIG. 2, characteristic line I indicates the tensile elongation retention characteristic of test specimen 1 (natural). Similarly, the characteristic line ■ is the test sample 2 (grid (A)), the characteristic line ■ is the test sample 3 (green (B)), the characteristic line ■ is the test sample 4 (green (C)), the characteristic line ■ is test sample 5 (green (D)
) and characteristic line (■) respectively indicate the tensile elongation retention characteristics of test specimen 6 (black).
第２図から分かる通り、顔料を含まない試験検体１（ナ
チュラル）は、顔料を含有する試験検体２〜６に比較し
て短時間の紫外線照射により、弓張り伸び残率か減衰し
ていることか分かった。As can be seen from Figure 2, test specimen 1 (natural), which does not contain pigment, has a lower arch elongation retention due to short-term ultraviolet irradiation compared to test specimens 2 to 6, which contain pigment. I understand.
また、耐候性安定剤を含有しない試験検体２（グリーン
（Ａ））比較して、耐候性安定剤を含有する試験検体２
〜５（グリーン（Ｂ） （Ｄ））の方が、長時間にわた
り紫外線を照射しても、引張り伸び残率を維持できるこ
と分かった。また、耐候性安定剤の含量か多いほど（試
験検体５（グリーン（Ｄ））、より長時間にわたり引張
り伸び残率を維持できることか確認できた。In addition, compared to test specimen 2 (green (A)) which does not contain a weathering stabilizer, test specimen 2 containing a weathering stabilizer
~5 (Green (B) (D)) was found to be able to maintain tensile elongation retention even after being irradiated with ultraviolet rays for a long time. It was also confirmed that the higher the content of the weathering stabilizer (Test Specimen 5 (Green (D)), the more the tensile elongation retention could be maintained for a longer period of time.
また、黒色の顔料を含有する試験検体６は、耐候性安定
剤を含有していないか、５０００時間以上、はぼ１００
９ｏの引張り伸び残率を維持できることか分かった。In addition, the test specimen 6 containing black pigment did not contain a weathering stabilizer or was tested for more than 5000 hours,
It was found that it was possible to maintain a tensile elongation retention of 9o.
以上説明した如く、プラスチック被覆鋼管６によれば、
所定量の酸化防止剤及び耐候性安定剤を含量する着色防
食層を最外層に有しているので、耐候性を著しく向上さ
せることができる。この結果、プラスチック被覆鋼管６
の寿命を、大幅に延長し、且つ保守管理の手間を軽減で
きる。As explained above, according to the plastic coated steel pipe 6,
Since the outermost layer has a colored anti-corrosion layer containing a predetermined amount of antioxidant and weather resistance stabilizer, weather resistance can be significantly improved. As a result, plastic coated steel pipe 6
It is possible to significantly extend the lifespan of the product and reduce the effort required for maintenance.
また、最外層の着色防食層５のみを着色すれば足りるの
で、必要な着色顔料の量を低減できる。Moreover, since it is sufficient to color only the outermost colored anticorrosive layer 5, the amount of necessary colored pigment can be reduced.
次に、プラスチック被覆鋼管６の製造方法について詳細
に説明する。Next, a method for manufacturing the plastic-coated steel pipe 6 will be described in detail.
次に、クロメート層２の周面上に接着層２を設ける。Next, an adhesive layer 2 is provided on the circumferential surface of the chromate layer 2.
次いで、次のように防食層４、着色防食層５を押出積層
する。すなわち、第１の押出機により、約２２０℃で溶
融した未着色のポリエチレン樹脂を鋼管本体１周面上に
押出被覆し、防食層４を被着形成する。次に、第１の押
出機よりも下流に設けた第１の水冷手段により、防食層
４を冷却し、その外面温度を約８０℃に設定する。次い
て、第１の水冷手段によりも下流に設けた第２の押出機
により、約２２０℃に溶融した着色防食層５の原料樹脂
等を防食層４上に押出し、着色防食層５を融着させる。Next, the anti-corrosion layer 4 and the colored anti-corrosion layer 5 are extruded and laminated as follows. That is, an uncolored polyethylene resin melted at about 220° C. is extruded and coated onto one peripheral surface of the steel pipe main body by a first extruder to form the anticorrosive layer 4. Next, the anticorrosive layer 4 is cooled by a first water cooling means provided downstream of the first extruder, and its outer surface temperature is set to about 80°C. Next, a second extruder provided downstream of the first water cooling means extrudes the raw material resin etc. of the colored anti-corrosion layer 5 melted at about 220°C onto the anti-corrosion layer 4, and the colored anti-corrosion layer 5 is fused. let
然る後、第２の押出機よりも下流に設けられた水冷手段
により着色防食層５を冷却する。このようにして、プラ
スチック被覆鋼管６を製造する。Thereafter, the colored anticorrosion layer 5 is cooled by a water cooling means provided downstream of the second extruder. In this way, the plastic coated steel pipe 6 is manufactured.
このようにして、得たプラスチック被覆鋼管６について
以下に示す剥離試験を行った。この試験条件を下記第２
表に示す。なお、第２層は、顔料として約１重量９６の
フタロシアニングリーンを、酸化防止剤として約０．１
５重量％の２−２°−メチレンビス（４−メチル−６−
ターシャルブチルフェノール）を、さらに耐候性安定剤
として、約０．２重量％の２−４−４− トリオキシベ
ンゾフェノンを含有するものにした。The following peel test was conducted on the plastic-coated steel pipe 6 thus obtained. This test condition is described in the second section below.
Shown in the table. The second layer contains about 1% by weight of phthalocyanine green as a pigment and about 0.1% by weight as an antioxidant.
5% by weight of 2-2°-methylenebis(4-methyl-6-
tertiary butylphenol) further contained about 0.2% by weight of 2-4-4-trioxybenzophenone as a weathering stabilizer.
第
つ
表
すなわち、剥離試験は、試験検体７〜１２について、第
１層から第２層を一定の引張り張力て弓き剥がし、第１
層と第２層との界面が剥離したときの界面剥離長（＋ｓ
■）を測定することにより行った。この試験結果は、第
３図に示す通りであった。Table 1: In the peel test, test specimens 7 to 12 were peeled off from the first layer to the second layer with a constant tensile tension.
Interfacial peeling length (+s) when the interface between the layer and the second layer peels off
(2)) was carried out by measuring. The test results were as shown in FIG.
また、試験検体７〜１２を５０℃の温水に浸漬した後、
同様に界面剥離長（＋ｎ ）を測定した。この試験結果
は、第４図に示す通りであった。In addition, after immersing test specimens 7 to 12 in 50°C warm water,
Similarly, the interfacial peeling length (+n) was measured. The test results were as shown in FIG.
第３図、第４図に示すとおり、第２層の膜厚が０．４■
ｌの場合、試験検体１（第１層外面温度６０℃）の界面
剥離長は約５〜１２＋ｓｍであった。すなわち、第１層
と第２層との密着力か弱いのにｚ、ｔ して、試験検体
８．９（第１層外面温度８０．１００℃）では、界面剥
離長か比較的短い。従って、第１層と第２層との密着力
は十分に強いことか分かった。As shown in Figures 3 and 4, the thickness of the second layer is 0.4mm.
In the case of 1, the interfacial peeling length of test specimen 1 (first layer outer surface temperature 60° C.) was about 5 to 12+sm. That is, although the adhesion between the first layer and the second layer is weak, the interfacial peeling length is relatively short in the test specimen 8.9 (first layer outer surface temperature 80.100° C.). Therefore, it was found that the adhesion between the first layer and the second layer was sufficiently strong.
また、第２層の膜厚が０．２ｍＬ１の場合、５０℃の温
水に浸漬する前では、試験検体１０〜１２は、いずれの
界面剥離長も殆、Ｈ’ Ｏｖｈｙａてあった。つまり、
第１層と第２層との密着力は非常に強いことか分かった
。しかしなから、浸漬後では、 試験検体１０（第１層
外面温度６０℃）の界面剥離長は、約２０ｍｍ前後であ
り、第１層と第２層との密着力は非常に弱くなっていた
。しかしながら、試験検体１１．１２（第１層外面温度
８０．１００℃）では、界面剥離長の変化はあまり見ら
れず、密着力の低下は殆どないことか分かった。Moreover, when the film thickness of the second layer was 0.2 mL1, all of the interfacial peeling lengths of test specimens 10 to 12 were almost H' Ovhya before being immersed in 50° C. hot water. In other words,
It was found that the adhesion between the first layer and the second layer was very strong. However, after immersion, the interfacial peeling length of test specimen 10 (first layer outer surface temperature 60°C) was approximately 20 mm, and the adhesion between the first and second layers was extremely weak. . However, in test specimen 11.12 (first layer outer surface temperature 80.100° C.), no significant change in interfacial peeling length was observed, indicating that there was almost no decrease in adhesion.
以上説明した如く、表面温度を約７０℃以上に設定した
防食層（第１層）上に着色防食層（第２層）を融着させ
ることにより、密着強度に優れたプラスチック被覆鋼管
を製造できた。As explained above, by fusing the colored anti-corrosion layer (second layer) on the anti-corrosion layer (first layer) whose surface temperature is set at approximately 70°C or higher, it is possible to manufacture plastic-coated steel pipes with excellent adhesion strength. Ta.
〔発明の効果〕
以上説明した如くに、本発明のプラスチック被覆鋼管に
よれば、耐候性に優れた着色防食層を最外層に設けてい
る。これにより、プラスチック被覆鋼管の耐候性を高め
ることができる。また、最外層の着色防食層のみを着色
すれば足りるので、必要な着色顔料の量を低減できる。[Effects of the Invention] As explained above, according to the plastic-coated steel pipe of the present invention, a colored anti-corrosion layer with excellent weather resistance is provided as the outermost layer. Thereby, the weather resistance of the plastic-coated steel pipe can be improved. Furthermore, since it is sufficient to color only the outermost colored anticorrosion layer, the amount of necessary colored pigment can be reduced.
この結果、プラスチック被覆鋼管の寿命を大幅に延長で
き、且つ保守管理の手間を軽減できると共に、プラスチ
ック被覆鋼管の製造コストを大幅に低減できる。As a result, the life of the plastic-coated steel pipe can be significantly extended, the effort of maintenance management can be reduced, and the manufacturing cost of the plastic-coated steel pipe can be significantly reduced.
また、本発明のプラスチック被覆鋼管の製造方法によれ
ば、所定温度に設定された防食層の周面上に着色防食層
を融着させている。このため、両防食層同士の密着性に
優れたプラスチック被覆鋼管を製造することができる。Further, according to the method for manufacturing a plastic-coated steel pipe of the present invention, a colored anti-corrosion layer is fused onto the circumferential surface of the anti-corrosion layer set at a predetermined temperature. Therefore, a plastic-coated steel pipe with excellent adhesion between both anti-corrosion layers can be manufactured.
第１図は、Ｍ−本発明のプラスチック被覆鋼管の一例の
要部を示す説明図、第２図乃至第４図は、本発明の詳細
な説明するための試験結果を示す特性図である。
鋼管本体、
２・・・クロメート層、
３・・・接着層、
４ ・・
防食層、
５・・・着色防食層、
６・・・プラスチ
ク被覆鋼管。FIG. 1 is an explanatory view showing essential parts of an example of the M-plastic coated steel pipe of the present invention, and FIGS. 2 to 4 are characteristic diagrams showing test results for explaining the present invention in detail. Steel pipe body, 2... Chromate layer, 3... Adhesive layer, 4... Anti-corrosion layer, 5... Colored anti-corrosion layer, 6... Plastic coated steel pipe.
Claims (2)
地層上に設けられた接着層と、該接着層上に被着された
防食層と、所定の色を有し、且つ、酸化防止剤を０．１
重量％以上、耐候性安定剤を０．３重量％以上含有して
、前記防食層上に融着された着色防食層とを具備するこ
とを特徴とするプラスチック被覆鋼管。(1) A base layer formed on the outer circumferential surface of the steel pipe body, an adhesive layer provided on the base layer, and an anticorrosion layer coated on the adhesive layer, each having a predetermined color, and , antioxidant 0.1
1. A plastic-coated steel pipe comprising a colored anti-corrosion layer fused onto the anti-corrosion layer, containing a weathering stabilizer in an amount of 0.3 wt % or more.
下地層の周面上に接着層を介して防食層を被着させる工
程と、該防食層の外面温度を７０℃以上に設定する工程
と、所定の色を有し、且つ、酸化防止剤を０．１重量％
以上、耐候性安定剤を０．３重量％以上含有した着色防
食層を前記防食層上に押出被覆して融着させる工程とを
具備することを特徴とするプラスチック被覆鋼管の製造
方法。(2) Forming a base layer on the circumferential surface of the steel pipe body, depositing a corrosion protection layer on the circumference of the base layer via an adhesive layer, and increasing the outer surface temperature of the corrosion protection layer to 70°C or higher. and a predetermined color, and contains 0.1% by weight of antioxidant.
A method for producing a plastic-coated steel pipe, which comprises the steps of extrusion coating and fusing a colored anticorrosion layer containing 0.3% by weight or more of a weathering stabilizer on the anticorrosion layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2193843A JPH0767779B2 (en) | 1990-07-24 | 1990-07-24 | Manufacturing method of plastic coated steel pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2193843A JPH0767779B2 (en) | 1990-07-24 | 1990-07-24 | Manufacturing method of plastic coated steel pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0480029A true JPH0480029A (en) | 1992-03-13 |
| JPH0767779B2 JPH0767779B2 (en) | 1995-07-26 |
Family
ID=16314667
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2193843A Expired - Fee Related JPH0767779B2 (en) | 1990-07-24 | 1990-07-24 | Manufacturing method of plastic coated steel pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0767779B2 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5760144A (en) * | 1980-09-29 | 1982-04-10 | Sanyo Electric Co Ltd | Solar heat collecting apparatus |
| JPS6022622A (en) * | 1984-06-27 | 1985-02-05 | Matsushita Electric Ind Co Ltd | Pen device of recorder |
| JPS60245544A (en) * | 1984-05-22 | 1985-12-05 | 新日本製鐵株式会社 | Steel pipe coated with polypropylene |
-
1990
- 1990-07-24 JP JP2193843A patent/JPH0767779B2/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5760144A (en) * | 1980-09-29 | 1982-04-10 | Sanyo Electric Co Ltd | Solar heat collecting apparatus |
| JPS60245544A (en) * | 1984-05-22 | 1985-12-05 | 新日本製鐵株式会社 | Steel pipe coated with polypropylene |
| JPS6022622A (en) * | 1984-06-27 | 1985-02-05 | Matsushita Electric Ind Co Ltd | Pen device of recorder |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0767779B2 (en) | 1995-07-26 |
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