JPH0767779B2 - Manufacturing method of plastic coated steel pipe - Google Patents
Manufacturing method of plastic coated steel pipeInfo
- Publication number
- JPH0767779B2 JPH0767779B2 JP2193843A JP19384390A JPH0767779B2 JP H0767779 B2 JPH0767779 B2 JP H0767779B2 JP 2193843 A JP2193843 A JP 2193843A JP 19384390 A JP19384390 A JP 19384390A JP H0767779 B2 JPH0767779 B2 JP H0767779B2
- Authority
- JP
- Japan
- Prior art keywords
- layer
- steel pipe
- coated steel
- plastic
- anticorrosion
- 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 - Fee Related
Links
- 229910000831 Steel Inorganic materials 0.000 title claims description 31
- 239000010959 steel Substances 0.000 title claims description 31
- 229920003023 plastic Polymers 0.000 title claims description 23
- 239000004033 plastic Substances 0.000 title claims description 23
- 238000004519 manufacturing process Methods 0.000 title description 12
- 239000010410 layer Substances 0.000 claims description 71
- 239000003381 stabilizer Substances 0.000 claims description 13
- 230000002093 peripheral effect Effects 0.000 claims description 10
- 239000003963 antioxidant agent Substances 0.000 claims description 8
- 230000003078 antioxidant effect Effects 0.000 claims description 8
- 239000012790 adhesive layer Substances 0.000 claims description 6
- 238000000151 deposition Methods 0.000 claims description 2
- 238000007765 extrusion coating Methods 0.000 claims 1
- 239000000049 pigment Substances 0.000 description 11
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 7
- 238000004040 coloring Methods 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 238000001125 extrusion Methods 0.000 description 4
- 229920013716 polyethylene resin Polymers 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- IKEHOXWJQXIQAG-UHFFFAOYSA-N 2-tert-butyl-4-methylphenol Chemical compound CC1=CC=C(O)C(C(C)(C)C)=C1 IKEHOXWJQXIQAG-UHFFFAOYSA-N 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 239000012965 benzophenone Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- IEQIEDJGQAUEQZ-UHFFFAOYSA-N phthalocyanine Chemical compound N1C(N=C2C3=CC=CC=C3C(N=C3C4=CC=CC=C4C(=N4)N3)=N2)=C(C=CC=C2)C2=C1N=C1C2=CC=CC=C2C4=N1 IEQIEDJGQAUEQZ-UHFFFAOYSA-N 0.000 description 2
- 239000006223 plastic coating Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- MLXZPCPWJGJKKH-UHFFFAOYSA-N 2-methylphenol propane Chemical compound CCC.CC1=CC=CC=C1O.CC1=CC=CC=C1O MLXZPCPWJGJKKH-UHFFFAOYSA-N 0.000 description 1
- BZVSAXZMNAGMLW-UHFFFAOYSA-N C=C1CC=C(C(=C1)C(C)(C)C)O Chemical compound C=C1CC=C(C(=C1)C(C)(C)C)O BZVSAXZMNAGMLW-UHFFFAOYSA-N 0.000 description 1
- 125000003545 alkoxy group Chemical group 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000003796 beauty Effects 0.000 description 1
- RWCCWEUUXYIKHB-UHFFFAOYSA-N benzophenone Chemical compound C=1C=CC=CC=1C(=O)C1=CC=CC=C1 RWCCWEUUXYIKHB-UHFFFAOYSA-N 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
Landscapes
- Application Of Or Painting With Fluid Materials (AREA)
- Laminated Bodies (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
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の製造方法に関する。The present invention relates to a method for producing a plastic-coated steel pipe.
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が使用されている。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。BACKGROUND ART Conventionally, a plastic-coated steel pipe that has been subjected to a coloring treatment has been used in order to identify the purpose of use and maintain the beauty of the landscape. Coloring treatment of such plastic coated steel pipe, for example,
A coating material in which a coloring pigment is kneaded is melted and extrusion-coated on a 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
性が劣るため、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、一旦着色した被覆原料
は、廃棄しなければならないので、樹脂原料の損失につ
ながる。However, since the colored plastic coating layer has poor weather resistance, it needs to be regularly maintained. Further, since the color pigment is kneaded into the entire coating layer, the manufacturing cost is high. Moreover, in the production of such a plastic-coated steel pipe, when the color is changed, it is necessary to discharge all the coating raw material remaining in the extruder, which requires a lot of labor to clean the inside of the extruder. Further, the coating material once colored must be discarded, resulting in loss of the resin material.
本発明は、かかる点に鑑みてなされたものであり、保守
管理の必要が殆ど無く、且つ製造コストを低減できるプ
ラスチック被覆鋼管の製造方法を提供するものである。The present invention has been made in view of the above points, and provides a method for manufacturing a plastic-coated steel pipe that requires little maintenance and can reduce the manufacturing cost.
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, a step of forming a base layer on the peripheral surface of the steel pipe body, a step of depositing an anticorrosion layer on the peripheral surface of the base layer via an adhesive layer, the outer surface temperature of the anticorrosion layer 70 ℃ With the steps set as above, and having a predetermined color, and 0.1 wt% or more of an antioxidant, 0.3 wt% or more of a weather resistance stabilizer a colored anticorrosion layer is extrusion-coated on the anticorrosion layer and melted. The method for producing a plastic-coated steel pipe is characterized by comprising:
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、外面温度が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。According to the method for producing a plastic-coated steel pipe of the present invention, the colored anticorrosion layer is extrusion-coated on the anticorrosion layer whose outer surface temperature is set to 70 ° C. or higher, and both anticorrosion layers are fused together. This makes it possible to easily manufacture a plastic-coated steel pipe having excellent adhesion between both anticorrosion layers.
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 view showing a main part 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、プライマー等が使
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1.0mmの防食層４が被着されている。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0.4mm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％
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
用することができる。また、耐候性安定剤としては、例
えば、ベンゾフェノン系耐候性安定剤としては２−４−
ジオキソベンゾフェノン、２−４−４′−トリオキシベ
ンゾフェノンを、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′−メトキシベンゾフェノ
ン、２−２′−ジオキシ−４−プトキシベンゾフェノン
等を使用することができる。In the figure, 1 is a steel pipe body. On the outer peripheral surface of the steel pipe body 1, a chromate layer 2 is formed as a base layer. In addition to the chromate layer 2, a primer or the like can be used as the base layer. On the peripheral surface of the chromate layer 2, an anticorrosion layer 4 having a thickness of about 1.0 mm is adhered via an adhesive layer 3. The adhesive layer 3 is made of, for example, an adhesive polyethylene resin. The anticorrosion layer 4 is formed of uncolored polyethylene resin. On the anticorrosion layer 4, a colored anticorrosion layer 5 having a thickness of about 0.4 mm is fused. Colored anticorrosion layer 5 is about 1% by weight
Coloring pigment, about 0.15% by weight antioxidant, about 0.2% by weight
It is made of polyethylene resin containing a weather resistance stabilizer. Examples of the antioxidant include di-ortho-cresol propane and 2-
2′-methylenebis (4-methyl-6-tert-butylphenol) and the like are used as amine stabilizers in NN ′.
-Di-β-naphthol-paraphenylenediamine and the like can be used. Further, as the weather resistance stabilizer, for example, 2-4- as the benzophenone-based weather resistance stabilizer
Dioxobenzophenone, 2-4-4'-trioxybenzophenone, and 2-oxy-4-4'-methoxybenzophenone, 2-2'-dioxy-4-ptoxybenzophenone are used as the alkoxy derivative of benzophenone. be able to.
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。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′−ト
リオキシベンゾフェノンを使用した。また、試験検体２
〜５のグリーン（Ａ）〜（Ｄ）の顔料には、フタロシア
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。With respect to the plastic-coated steel pipe 6 configured in this way, the tensile elongation residual ratio shown below was examined. In this test, a plastic coated steel pipe 6 having a composition shown in Table 1 below and having a colored anticorrosive layer containing a pigment, an antioxidant and a weather resistance stabilizer was used. For the antioxidant of the colored anticorrosion layer, 2-
2'-methylenebis (4-methyl-6-tert-butylphenol), 2-4-4'-trioxybenzophenone was used as the weather resistance stabilizer. Also, test sample 2
~ 5 green (A) ~ (D) pigment, phthalocyanine green, as the test sample 6 black pigment,
Carbon black was used.
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、一定時間ごとに
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IIは、試験検体２
（グリーン（Ａ））、特性線IIIは、試験検体３（グリ
ーン（Ｂ））、特性線IVは、試験検体４（グリーン
（Ｃ））、特性線Vは、試験検体５（グリーン
（Ｄ））、特性線VI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。 The various test specimens 1 to 6 were irradiated with ultraviolet rays by a weatherometer for 0 to 5000 hours, and the tensile elongation residual ratio (%) of the colored anticorrosion layer was measured at regular intervals. The results of these measurements are as shown in FIG. Where the second
In the figure, the characteristic line I shows the tensile elongation residual rate characteristic of the test sample 1 (natural). Similarly, the characteristic line II shows the test sample 2
(Green (A)), characteristic line III is test sample 3 (green (B)), characteristic line IV is test sample 4 (green (C)), characteristic line V is test sample 5 (green (D)) ) And the characteristic line VI show the tensile elongation residual rate characteristics of the test sample 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、引張り伸び残率が減衰し
ていることが分かった。As can be seen from FIG. 2, in the test sample 1 (natural) containing no pigment, the tensile elongation residual ratio is attenuated by irradiation of ultraviolet rays for a shorter time than the test samples 2 to 6 containing pigment. Do you get it.
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が多いほど（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が確認できた。Further, in comparison with the test sample 2 (green (A)) containing no weather resistance stabilizer, the test sample 2 containing a weather resistance stabilizer
It was found that ~ 5 (green (B) and (D)) can maintain the tensile elongation residual ratio even when irradiated with ultraviolet rays for a long time. It was also confirmed that the greater the content of the weather resistance stabilizer (test sample 5 (green (D)), the more the tensile elongation residual rate can be maintained for a longer 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が、5000時間以上、ほぼ100％の引
張り伸び残率を維持できることが分かった。Further, it was found that the test sample 6 containing the black pigment, which does not contain the weather resistance stabilizer, can maintain the tensile elongation residual rate of almost 100% for 5000 hours or more.
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有する着色防
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 described above, according to the plastic-coated steel pipe 6,
Since the outermost layer has the colored anticorrosive layer containing a predetermined amount of the antioxidant and the weather resistance stabilizer, the weather resistance can be remarkably improved. As a result, the plastic coated steel pipe 6
The life of the product can be significantly extended and the maintenance work can be reduced.
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。Further, since it is sufficient to color only the outermost colored anticorrosion layer 5, the amount of the required coloring 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.
まず、鋼管本体１の周面上に、クロメートを塗布・乾燥
してクロメート層２を形成する。First, a chromate layer 2 is formed by coating and drying chromate on the peripheral surface of the steel pipe body 1.
次に、クロメート層２の周面上に接着層２を設ける。Next, the adhesive layer 2 is provided on the peripheral 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。次いで、
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。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。Then, the anticorrosion layer 4 and the colored anticorrosion layer 5 are extrusion-laminated as follows. That is, an uncolored polyethylene resin melted at about 220 ° C. is extrusion-coated on the peripheral surface of the steel pipe body 1 by the first extruder, and the anticorrosion layer 4 is adhered and formed. Next, the anticorrosion layer 4 is formed by the first water-cooling means provided downstream of the first extruder.
And set the outer surface temperature to about 80 ° C. Then
The raw material resin of the colored anticorrosion layer 5 melted at about 220 ° C. is extruded onto the anticorrosion layer 4 by the second extruder provided downstream of the first water cooling means, and the colored anticorrosion layer 5 is fused. After that, 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％のフ
タロシアニングリーンを、酸化防止剤として約0.15重量
％の２−２′−メチレンビス（４−メチレン−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。In this way, the following peel test was performed on the obtained plastic-coated steel pipe 6. This test condition is
Shown in the table. The second layer contains about 1% by weight of phthalocyanine green as a pigment, about 0.15% by weight of 2-2'-methylenebis (4-methylene-6-tert-butylphenol) as an antioxidant, and further stable weather resistance. The agent contained about 0.2% by weight of 2-4-4'-trioxybenzophenone.
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で引き剥がし、第１層
と第２層との界面が剥離したときの界面剥離長（mm）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。 That is, the peeling test is performed on the first to seventh test samples 7 to 12.
The second layer was peeled off from the layer with a constant tensile tension, and the interfacial peeling length (mm) when the interface between the first layer and the second layer was peeled off was measured. 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（mm）を測定した。この試験結果は、第４
図に示す通りであった。Further, after the test specimens 7 to 12 were immersed in warm water of 50 ° C., the interfacial peeling length (mm) was measured in the same manner. This test result is
It was as shown in the figure.
第３図、第４図に示すとおり、第２層の膜厚が0.4mmの
場合、試験検体１（第１層外面温度60℃）の界面剥離長
は約５〜12mmであった。すなわち、第１層と第２層との
密着力が弱いのに対して、試験検体８、９（第１層外面
温度80,100℃）では、界面剥離長が比較的短い。従っ
て、第１層と第２層との密着力は十分に強いことが分か
った。As shown in FIGS. 3 and 4, when the film thickness of the second layer was 0.4 mm, the interfacial peeling length of the test sample 1 (first layer outer surface temperature 60 ° C.) was about 5 to 12 mm. That is, the adhesion between the first layer and the second layer is weak, whereas in the test specimens 8 and 9 (first layer outer surface temperature 80, 100 ° C.), the interfacial peeling length is relatively short. 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0.2mm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
殆ど0mmであった。つまり、第１層と第２層との密着力
は非常に強いことが分かった。しかしながら、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が分かっ
た。Further, when the film thickness of the second layer was 0.2 mm, all the interfacial peeling lengths of the test samples 10 to 12 were almost 0 mm before being immersed in the hot water of 50 ° C. That is, it was found that the adhesion between the first layer and the second layer was very strong. However, after immersion, the interfacial peel length of the test sample 10 (first layer outer surface temperature 60 ° C.) was about 20 mm, and the adhesion between the first layer and the second layer was very weak. However, test sample 11,12
It was found that at (first layer outer surface temperature 80, 100 ° C.), the interfacial peeling length did not change so much, and the adhesive strength did not substantially decrease.
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 described above, by fusion-bonding the colored anticorrosion layer (second layer) on the anticorrosion layer (first layer) whose surface temperature is set to about 70 ° C or higher, a plastic-coated steel pipe having excellent adhesion strength can be produced. It was
以上説明した如くに、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。As described above, according to the method for manufacturing a plastic-coated steel pipe of the present invention, the colored anticorrosion layer is fused on the peripheral surface of the anticorrosion layer set to a predetermined temperature. Therefore, it is possible to manufacture a plastic-coated steel pipe having excellent adhesion between both anticorrosion layers.
第１図は、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、本発明の効果を説
明するための試験結果を示す特性図である。 １……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……プラスチック
被覆鋼管。FIG. 1 is an explanatory diagram showing a main part of an example of the plastic-coated steel pipe of the present invention, and FIGS. 2 to 4 are characteristic diagrams showing test results for explaining the effects of the present invention. 1 ... Steel tube body, 2 ... chromate layer, 3 ... adhesive layer,
4 ... Anticorrosion layer, 5 ... Colored anticorrosion layer, 6 ... Plastic coated steel pipe.
フロントページの続き (72)発明者 大槻 博史 東京都千代田区丸の内１丁目１番２号 日 本鋼管株式会社内 (72)発明者 森岡 芳之 東京都千代田区丸の内１丁目１番２号 日 本鋼管株式会社内 (56)参考文献 特開 昭60−245544（ＪＰ，Ａ) 特開 昭63−312597（ＪＰ，Ａ) 特公 昭60−22622（ＪＰ，Ｂ２) 特公 昭57−60144（ＪＰ，Ｂ２)Front page continuation (72) Inventor Hiroshi Otsuki 1-2 1-2 Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd. In-house (56) Reference JP 60-245544 (JP, A) JP 63-312597 (JP, A) JP 60-22226 (JP, B2) JP 57-60144 (JP, B2) )
Claims (1)
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、耐候性安定材を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。1. A step of forming an underlayer on the peripheral surface of a steel pipe body, a step of depositing an anticorrosion layer on the peripheral surface of the underlayer via an adhesive layer, and an outer surface temperature of the anticorrosion layer of 70. With a step of setting at a temperature of ℃ or more, and having a predetermined color, and 0.1% by weight or more of an antioxidant, 0.3% by weight or more of a weather resistant stabilizer is coated by extrusion coating a colored anticorrosion layer on the anticorrosion layer. And a step of fusing the plastic-coated steel pipe.
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 JPH0480029A (en) | 1992-03-13 |
| JPH0767779B2 true 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) |
Family Cites Families (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 |
| JPS6052362B2 (en) * | 1984-06-27 | 1985-11-19 | 松下電器産業株式会社 | recorder pen device |
-
1990
- 1990-07-24 JP JP2193843A patent/JPH0767779B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0480029A (en) | 1992-03-13 |
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