JP2018001546A - Steel pipe coated with three layers of polyolefin resin having end shape excellent in peel resistance - Google Patents
Steel pipe coated with three layers of polyolefin resin having end shape excellent in peel resistance Download PDFInfo
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- JP2018001546A JP2018001546A JP2016130313A JP2016130313A JP2018001546A JP 2018001546 A JP2018001546 A JP 2018001546A JP 2016130313 A JP2016130313 A JP 2016130313A JP 2016130313 A JP2016130313 A JP 2016130313A JP 2018001546 A JP2018001546 A JP 2018001546A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 146
- 239000010959 steel Substances 0.000 title claims abstract description 146
- 229920005672 polyolefin resin Polymers 0.000 title abstract description 31
- 239000011248 coating agent Substances 0.000 claims abstract description 105
- 238000000576 coating method Methods 0.000 claims abstract description 105
- 229920000098 polyolefin Polymers 0.000 claims abstract description 54
- 239000003822 epoxy resin Substances 0.000 claims abstract description 33
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 33
- 239000010410 layer Substances 0.000 claims description 85
- 239000000843 powder Substances 0.000 claims description 29
- 238000005520 cutting process Methods 0.000 claims description 28
- 239000012790 adhesive layer Substances 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 238000005260 corrosion Methods 0.000 abstract description 20
- 238000011282 treatment Methods 0.000 abstract description 19
- 230000007797 corrosion Effects 0.000 abstract description 16
- 239000002987 primer (paints) Substances 0.000 description 78
- -1 polypropylene Polymers 0.000 description 40
- 229920013716 polyethylene resin Polymers 0.000 description 34
- 239000000853 adhesive Substances 0.000 description 27
- 230000001070 adhesive effect Effects 0.000 description 27
- 229920000573 polyethylene Polymers 0.000 description 23
- 238000000034 method Methods 0.000 description 22
- 230000000052 comparative effect Effects 0.000 description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 19
- 239000004698 Polyethylene Substances 0.000 description 17
- 230000009477 glass transition Effects 0.000 description 15
- 239000004743 Polypropylene Substances 0.000 description 14
- 238000010438 heat treatment Methods 0.000 description 14
- 239000008188 pellet Substances 0.000 description 14
- 229920001155 polypropylene Polymers 0.000 description 14
- 229920005989 resin Polymers 0.000 description 13
- 239000011347 resin Substances 0.000 description 13
- 239000002356 single layer Substances 0.000 description 13
- 238000012545 processing Methods 0.000 description 12
- 239000000049 pigment Substances 0.000 description 11
- 238000005422 blasting Methods 0.000 description 8
- 238000001816 cooling Methods 0.000 description 8
- 238000003466 welding Methods 0.000 description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 7
- 239000001023 inorganic pigment Substances 0.000 description 7
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 7
- 239000000126 substance Substances 0.000 description 7
- 229910000975 Carbon steel Inorganic materials 0.000 description 6
- 229920003355 Novatec® Polymers 0.000 description 6
- 239000002313 adhesive film Substances 0.000 description 6
- 239000010962 carbon steel Substances 0.000 description 6
- 238000004140 cleaning Methods 0.000 description 6
- RLAWWYSOJDYHDC-BZSNNMDCSA-N lisinopril Chemical compound C([C@H](N[C@@H](CCCCN)C(=O)N1[C@@H](CCC1)C(O)=O)C(O)=O)CC1=CC=CC=C1 RLAWWYSOJDYHDC-BZSNNMDCSA-N 0.000 description 6
- 230000001680 brushing effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 229920006223 adhesive resin Polymers 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 229920001577 copolymer Polymers 0.000 description 3
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical group O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000003963 antioxidant agent Substances 0.000 description 2
- IISBACLAFKSPIT-UHFFFAOYSA-N bisphenol A Chemical compound C=1C=C(O)C=CC=1C(C)(C)C1=CC=C(O)C=C1 IISBACLAFKSPIT-UHFFFAOYSA-N 0.000 description 2
- PXKLMJQFEQBVLD-UHFFFAOYSA-N bisphenol F Chemical compound C1=CC(O)=CC=C1CC1=CC=C(O)C=C1 PXKLMJQFEQBVLD-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 239000007888 film coating Substances 0.000 description 2
- 238000009501 film coating Methods 0.000 description 2
- RAXXELZNTBOGNW-UHFFFAOYSA-N imidazole Natural products C1=CNC=N1 RAXXELZNTBOGNW-UHFFFAOYSA-N 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 239000005995 Aluminium silicate Substances 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 1
- 235000012211 aluminium silicate Nutrition 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 1
- 229910000423 chromium oxide Inorganic materials 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 229920003020 cross-linked polyethylene Polymers 0.000 description 1
- 239000004703 cross-linked polyethylene Substances 0.000 description 1
- 238000001723 curing Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- QGBSISYHAICWAH-UHFFFAOYSA-N dicyandiamide Chemical compound NC(N)=NC#N QGBSISYHAICWAH-UHFFFAOYSA-N 0.000 description 1
- 239000003623 enhancer Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000013007 heat curing Methods 0.000 description 1
- 229920001519 homopolymer Polymers 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 229920003986 novolac Polymers 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 239000013615 primer Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 230000009291 secondary effect Effects 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- BIKXLKXABVUSMH-UHFFFAOYSA-N trizinc;diborate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]B([O-])[O-].[O-]B([O-])[O-] BIKXLKXABVUSMH-UHFFFAOYSA-N 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000010456 wollastonite Substances 0.000 description 1
- 229910052882 wollastonite Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- LRXTYHSAJDENHV-UHFFFAOYSA-H zinc phosphate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O LRXTYHSAJDENHV-UHFFFAOYSA-H 0.000 description 1
- 229910000165 zinc phosphate Inorganic materials 0.000 description 1
Landscapes
- Protection Of Pipes Against Damage, Friction, And Corrosion (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
- Laminated Bodies (AREA)
Abstract
Description
石油・ガス等のエネルギー輸送に用いられるラインパイプの防食用外面被覆には通常ポリオレフィン樹脂被覆鋼管が使用されるが、本発明は、この耐剥離性に優れた端部形状を有する3層ポリオレフィン樹脂被覆鋼管に関する。 A polyolefin resin-coated steel pipe is usually used for the outer surface coating for corrosion protection of line pipes used for energy transportation of oil and gas, etc., but the present invention is a three-layer polyolefin resin having an end shape excellent in this peel resistance. It relates to a coated steel pipe.
ラインパイプに用いられる外面ポリオレフィン樹脂被覆鋼管において、長期の防食性と施工時の耐疵性が要求される場合には3層被覆鋼管が用いられる。その構成は防食性の高いエポキシ樹脂プライマー層、接着剤層、ポリオレフィン樹脂層からなる3層構造である。被覆されるポリオレフィン樹脂には、ポリエチレン樹脂とポリプロピレン樹脂があるが、安価で信頼性が高いことから、一般的にはポリエチレン樹脂が、高温用や耐疵性が要求される場合にはポリプロピレン樹脂が使用される。これらの3層被覆鋼管は被覆工場で生産され、現地で溶接接合を行う。 In the outer surface polyolefin resin-coated steel pipe used for the line pipe, a three-layer coated steel pipe is used when long-term corrosion resistance and weathering resistance during construction are required. The structure is a three-layer structure composed of an epoxy resin primer layer, an adhesive layer, and a polyolefin resin layer having high anticorrosion properties. Polyolefin resins to be coated include polyethylene resins and polypropylene resins. However, since they are inexpensive and highly reliable, in general, polyethylene resins are used, and polypropylene resins are used when high temperature and weather resistance are required. used. These three-layer coated steel pipes are produced at the coating plant and welded on site.
通常、外面被覆は、現地での溶接接合時の熱影響による被覆の劣化を考慮して、管端部の被覆を除去しておくため、管端部は鋼材が露出した状態で出荷される。ラインパイプで一般的な3層ポリオレフィン樹脂被覆に行われている鋼管端部の形状を図1に示す。鋼管被覆の一番弱い部分は、当該端部であり、ここから水分が侵入し被覆の剥離を発生させる場合がある。 Normally, the outer surface coating is shipped with the steel material exposed in order to remove the coating at the end of the tube in consideration of the deterioration of the coating due to the thermal effect during welding at the site. FIG. 1 shows the shape of a steel pipe end portion applied to a general three-layer polyolefin resin coating by a line pipe. The weakest part of the steel pipe coating is the end, and moisture may enter from there to cause peeling of the coating.
そこで、端部の応力を小さくするために、図1に示すように被覆端部を斜めの形状にする事が一般的に行われている。特許文献1では、この斜めの形状を形成するための加工装置が示されており、特許文献2では、斜めの形状をワイヤーブラシで形成するために曲面形状が示されている。
この斜めの形状は、現場溶接接合後に鋼材が露出した部分を架橋ポリエチレンスリーブ(収縮スリーブ)で防食する際に該スリーブと鋼管被覆端部とのなじみを良くし、埋設後の地中の水侵入を防止する働きがある。この関係を図2に示す。
Therefore, in order to reduce the stress at the end, it is common practice to make the coated end at an oblique shape as shown in FIG. In Patent Document 1, a processing apparatus for forming this oblique shape is shown, and in Patent Document 2, a curved surface shape is shown for forming an oblique shape with a wire brush.
This slanted shape improves the familiarity between the sleeve and the steel pipe coating end when the exposed steel part is corroded with a cross-linked polyethylene sleeve (shrinkable sleeve) after on-site welding joining, and the underground water intrusion after embedding There is a function to prevent. This relationship is shown in FIG.
しかしながら、上記対策を持ってしても長期の埋設時には完全に水の侵入を防ぐことはできない。そこで、該スリーブと鋼管被覆端部の接着性をさらに向上させて水の侵入を防止する方法として、鋼管被覆端部にポリオレフィンプライマーを塗布することが特許文献3に提案されている。しかしこの方法は、現場での工程が増える問題がある。 However, even with the above measures, it is not possible to completely prevent water from entering when buried for a long time. Therefore, Patent Document 3 proposes that a polyolefin primer is applied to the steel pipe covering end as a method for further improving the adhesion between the sleeve and the steel pipe covering end to prevent water from entering. However, this method has a problem that the number of processes in the field increases.
鋼管被覆の最も弱い部分は端面であり、端面の部分に水が侵入し鋼面が腐食すると被覆が剥離していく。従って、水の侵入を完全に防止する手段があればこの問題は解決するが、水の分子は小さく、ラインパイプのように数十年間の長期に渡って供用されるインフラにあっては、水の侵入を完全に防ぐことは困難である。
従って、この水の侵入を出来るだけ小さくし、被覆の剥離に至らしめない技術の開発が要望されている。
The weakest part of the steel pipe coating is the end face, and when water penetrates into the end face and the steel surface is corroded, the coating peels off. Therefore, there is a means to completely prevent the intrusion of water, but this problem can be solved. However, in an infrastructure that has been used for a long period of several decades, such as a line pipe, the water molecule is small. It is difficult to completely prevent the intrusion.
Accordingly, there is a demand for the development of a technique that minimizes the penetration of water and does not lead to peeling of the coating.
すなわち、本発明に関する要旨は次の通りである。
(1)鋼管表面からエポキシ樹脂プライマー層、ポリオレフィン接着剤層、ポリオレフィン層が順次積層されたポリオレフィン被覆鋼管において、当該被覆端部のポリオレフィン接着剤層、ポリオレフィン層が鋼管表面と角度45度以下に形成され、当該端部から外側にエポキシ樹脂プライマー層のみ5mm以上塗り残されていることを特徴とする耐剥離性に優れた端部形状を有するポリオレフィン被覆鋼管。
(2)エポキシ樹脂プライマー層が粉体塗料を用いて形成され、その厚みが150〜600μmであることを特徴とする上記(1)に記載の耐剥離性に優れた端部形状を有するポリオレフィン被覆鋼管。
(3)ポリオレフィン被覆が形成されたのち、その端部をまず切削刃によってポリオレフィン接着剤層、ポリオレフィン層を鋼管表面と角度45度以下に形成し、しかるのちにスチールブラシによってエポキシ樹脂プライマー層を5mm以上塗り残すように整えることを特徴とする上記(1)又は(2)に記載の耐剥離性に優れた端部形状を有するポリオレフィン被覆鋼管の製造方法。
That is, the gist of the present invention is as follows.
(1) In a polyolefin-coated steel pipe in which an epoxy resin primer layer, a polyolefin adhesive layer, and a polyolefin layer are sequentially laminated from the surface of the steel pipe, the polyolefin adhesive layer and the polyolefin layer at the coated end are formed at an angle of 45 degrees or less with the steel pipe surface. A polyolefin-coated steel pipe having an end shape excellent in peel resistance, wherein only 5 mm or more of the epoxy resin primer layer is left uncoated from the end portion to the outside.
(2) The polyolefin coating having an end shape excellent in peel resistance according to the above (1), wherein the epoxy resin primer layer is formed using a powder coating material and has a thickness of 150 to 600 μm Steel pipe.
(3) After the polyolefin coating is formed, the end of the polyolefin adhesive layer is first formed with a cutting blade and the polyolefin layer is formed at an angle of 45 degrees or less with the steel pipe surface, and then the epoxy resin primer layer is 5 mm with a steel brush. The method for producing a polyolefin-coated steel pipe having an end shape excellent in peel resistance according to the above (1) or (2), characterized in that it is arranged so that it is left uncoated.
次に、上記本発明の要旨について、その内容を記載する。
3層ポリオレフィン被覆鋼管の管端部の形状を検討した結果、ポリオレフィン被覆の端部よりプライマー部分をはみ出させて長くする事がもっとも簡便で効果が大きい事が分かった。概略を図3に示す。当該プライマー部をはみ出させて5mm上長くする(延長する)事によって、被覆の端部いわゆる鋼面と被覆の端部がプライマー部の端にまで移動する結果、鋼面に水が侵入したとしても剥離するのは当該プライマー部のみであり、被覆の剥離には至らないこととなり、長期の耐久性を有する3層ポリオレフィン被覆を得ることが出来る。
また、延長されたプライマー部には上層のポリオレフィン被覆層がないため、当該層の収縮応力が働かず剥離が起こりにくくなる。
さらに、副次的効果として、現場でポリオレフィン被覆鋼管を溶接後に防食の目的で溶接部分を収縮スリーブで被覆するが、該スリーブと延長されたプライマー部との接着性が向上し、供用中の鋼管被覆への水の侵入をなお一層防止することができる。(図4)
なお、現場でプライマーを塗布すれば一見同様の効果が得られるように考えられるが、ポリオレフィン被覆時に塗布されたプライマー層と現場で塗布したプライマー層とは完全には一体にならないため長年月の間に両層間が剥離し、ここに水が侵入することによって被覆の剥離が発生する可能性がある。
Next, the contents of the gist of the present invention will be described.
As a result of examining the shape of the pipe end of the three-layer polyolefin-coated steel pipe, it was found that it is the simplest and most effective to extend the primer part beyond the end of the polyolefin coating. The outline is shown in FIG. Even if water penetrates into the steel surface as a result of the end portion of the coating so-called steel surface and the end portion of the coating moving to the end of the primer portion by protruding the primer portion and making it 5 mm longer (extend) Only the primer part is peeled off, and the coating is not peeled off, and a three-layer polyolefin coating having long-term durability can be obtained.
In addition, since the extended primer portion does not have an upper polyolefin coating layer, the contraction stress of the layer does not work, and peeling does not easily occur.
Furthermore, as a secondary effect, the welded part is covered with a shrink sleeve for the purpose of corrosion protection after the polyolefin-coated steel pipe is welded on site, but the adhesion between the sleeve and the extended primer part is improved, and the steel pipe in service It is possible to further prevent water from entering the coating. (Fig. 4)
Although it seems that the same effect can be obtained if the primer is applied on site, the primer layer applied at the time of polyolefin coating and the primer layer applied at the site are not completely integrated for many years. There is a possibility that peeling of the coating may occur when both layers are peeled off and water enters here.
延長するプライマーのみの部分には高い防食性と耐加工性が要求されるため、無機顔料が20重量%以上添加され、加熱硬化後のガラス転移温度が95℃以上になるように樹脂成分を調整した粉体状のエポキシ樹脂を塗布して加熱硬化させ、150〜600μmの膜厚となるようにする。
なお、非晶質の固体(例えば、ポリオレフィン樹脂)を加熱した場合、低温では結晶なみに硬く(剛性が大きく)流動性がなかった固体が、ある狭い範囲で急速に剛性と粘度が低下し流動性が増す。このような温度をガラス転移温度という。従って、ガラス転移温度が高いポリオレフィン樹脂ほど、低温(常温)では硬い樹脂となる。
このようにして、無機顔料とガラス転移温度の高温化によって塗膜硬度が確保されることから、上層のポリオレフィン被覆のみを除去するのが容易となる。また、150μm以上の膜厚とすることで、加工後でもピンホールが発生しない膜厚を残存させることが可能で、防食性確保に有効となる。
High corrosion resistance and processing resistance are required for the portion of the primer that extends only, so inorganic pigment is added at 20% by weight or more, and the resin component is adjusted so that the glass transition temperature after heat curing is 95 ° C or higher. The powdered epoxy resin is applied and heat-cured so as to have a film thickness of 150 to 600 μm.
When an amorphous solid (for example, a polyolefin resin) is heated, a solid that is hard (high rigidity) and has no fluidity at low temperatures will rapidly decrease in rigidity and viscosity within a narrow range. Increases nature. Such a temperature is called a glass transition temperature. Therefore, a polyolefin resin having a higher glass transition temperature becomes a harder resin at a low temperature (normal temperature).
Thus, since the coating film hardness is ensured by increasing the temperature of the inorganic pigment and the glass transition temperature, it becomes easy to remove only the upper polyolefin coating. Further, by setting the film thickness to 150 μm or more, it is possible to leave a film thickness that does not generate pinholes even after processing, which is effective for ensuring corrosion resistance.
次に、本発明の被覆鋼管の端部の形成方法について説明する。通常、樹脂被覆鋼管の被覆端部は溶接の熱影響を避けるために、管端部から100mm以上カットし溶接熱影響が被覆に及ばない用に鋼材露出部を設ける。この時、管端被覆端部には在る程度の斜めの形状(テーパー)加工が行われる。 Next, a method for forming the end of the coated steel pipe of the present invention will be described. Usually, in order to avoid the thermal influence of welding, the coated end portion of the resin-coated steel pipe is cut by 100 mm or more from the pipe end portion, and a steel exposed portion is provided so that the influence of the welding heat does not reach the coating. At this time, an oblique shape (tapering) process is performed so as to exist at the tube end covering end.
本発明の3層被覆鋼管では管端部の被覆に切削あるいはブラシ加工を行って、45度以下のテーパー形状のポリオレフィン被覆部とそのテーパー端の延長に5〜50mmのエポキシ樹脂のプライマー層のみを残存させ、プライマー層から鋼管端部までは鋼材を露出させた加工を行う。3層の積層のうちプライマー1層のみを残す加工を行うため、最下層のエポキシ樹脂プライマーには厚みと耐切削・耐ブラシ加工性が必要となる。このため、加工に耐える厚み確保が容易な粉体エポキシ樹脂を塗装する。また、塗料としては、顔料を20重量%以上含有し、硬化後のガラス転移温度が95℃以上の粉体エポキシ樹脂を用いる。このときのプライマー層の厚みは150〜600μmとする。 In the three-layer coated steel pipe of the present invention, the coating of the pipe end is cut or brushed, and a 45 ° or less taper-shaped polyolefin coating and only an epoxy resin primer layer of 5 to 50 mm is extended to the taper end. Processing is performed by leaving the steel material exposed from the primer layer to the end of the steel pipe. In order to perform the process of leaving only one primer layer among the three layers, the lowermost epoxy resin primer needs to have thickness and resistance to cutting and brushing. For this reason, the powder epoxy resin which can ensure the thickness which can be easily processed is applied. Moreover, as a coating material, the powder epoxy resin which contains a pigment 20weight% or more and whose glass transition temperature after hardening is 95 degreeC or more is used. The thickness of the primer layer at this time shall be 150-600 micrometers.
本発明の粉体エポキシ樹脂を用いた3層ポリオレフィン被覆鋼管において、鋼管の被覆両管端部に所定のテーパー加工とプライマー層のみを残存させる加工とを行う処理を行うことにより、現地溶接継ぎ手部の防食性を向上させる(図4)とともに、置き場保管中における被覆端部からの剥離を防止することが出来る。 In the three-layer polyolefin-coated steel pipe using the powder epoxy resin of the present invention, by performing a process of performing a predetermined taper process and a process of leaving only the primer layer on both ends of the pipes of the steel pipe, a local weld joint part is obtained. In addition to improving the anti-corrosion property (FIG. 4), it is possible to prevent peeling from the coated end during storage in the storage area.
以下、本発明につき詳細に説明を行なう。
本発明の3層ポリオレフィン樹脂被覆鋼管本体部分の被覆は既存の方法によって鋼管1の外面にプライマー層5、接着剤層3、ポリオレフィン樹脂層4の順に3層に形成される。
被覆に使用する鋼管に特に制限は無く、普通鋼、あるいは高合金鋼など、どのような鋼種でも適用可能である。また、サイズ、厚みの制約は設備に起因するのみである。鋼管は油等の付着がある場合は事前に除去した後に鋼管表面の錆や汚れを除去し、接着に必要な粗度を確保するためにブラスト処理を行う。ブラスト処理に用いる研掃材としては、一般的には鋼製グリッド・ショット粒を用いる。更に清浄な表面が要求される場合には、アルミナ等のセラミック素材を用いても良い。ブラスト処理後の表面に、鉄粉等の汚れが付着している場合、ブラシ、吸引、液体による洗浄等の処理を行うことができる。
Hereinafter, the present invention will be described in detail.
The coating of the three-layer polyolefin resin-coated steel pipe body portion of the present invention is formed in three layers in the order of the primer layer 5, the adhesive layer 3, and the polyolefin resin layer 4 on the outer surface of the steel pipe 1 by an existing method.
The steel pipe used for the coating is not particularly limited, and any steel type such as ordinary steel or high alloy steel can be applied. In addition, size and thickness restrictions are only attributable to the equipment. If there is adhesion of oil or the like to the steel pipe, it is removed in advance and then the rust and dirt on the surface of the steel pipe are removed and blasting is performed to ensure the roughness required for bonding. As a polishing material used for blasting, steel grid shot grains are generally used. Further, when a clean surface is required, a ceramic material such as alumina may be used. When dirt such as iron powder adheres to the surface after the blast treatment, treatments such as brushing, suction, and washing with liquid can be performed.
次に、洗浄処理、あるいは化成処理を行う。化成処理はリン酸やその他の処理を使用する事が出来るが、特に高い防食性能が要求される場合には、例えば日本パーカーライジング社製のパルクロム100などを用いて塗布型クロメート化成処理を行っても良い。 Next, a cleaning process or a chemical conversion process is performed. For the chemical conversion treatment, phosphoric acid or other treatments can be used. However, when particularly high anticorrosion performance is required, for example, a coating type chromate chemical conversion treatment is performed using, for example, PALCROME 100 manufactured by Nihon Parker Rising Co., Ltd. Also good.
次に、エポキシ樹脂プライマー層について説明する。プライマー層5には本発明の管端被覆構造を得るのに必要な150μm以上の膜厚と加工に対する耐切削性・耐ブラシ加工性が必要である。従来使用されているような液体タイプでは耐切削性・耐ブラシ加工性向上のために無機顔料を多く入れた場合、沈降や粘度の問題が生じる。また、厚膜塗装が難しいこともあって、厚膜塗装が可能な粉体エポキシ樹脂を加熱した鋼管に静電粉体塗装して形成する。 Next, the epoxy resin primer layer will be described. The primer layer 5 is required to have a film thickness of 150 μm or more necessary for obtaining the tube end covering structure of the present invention and cutting resistance and brush resistance to processing. In the liquid type used conventionally, when a large amount of inorganic pigment is added in order to improve cutting resistance and brush resistance, sedimentation and viscosity problems occur. Further, since thick film coating is difficult, a powder epoxy resin capable of thick film coating is formed by electrostatic powder coating on a heated steel pipe.
粉体エポキシ樹脂塗料はビスフェノールA型エポキシ樹脂、ビスフェノールF型エポキシ樹脂を単独、もしくは混合し、更に多官能性のフェノールノボラック型エポキシ樹脂やハロゲン化エポキシ樹脂を組み合わせたものに、フェノール系、アミン系、イミダゾール化合物、ジシアンジアミドといった硬化剤を添加して調整されているものが用いられるが、本発明で必要とされる特性としては切削、あるいはブラシ加工時の膜の耐久性である。そのため、粉体エポキシ樹脂紛体塗料としては無機顔料を20〜50重量%配合する。 Powder epoxy resin paints are bisphenol A type epoxy resin and bisphenol F type epoxy resin, or mixed with polyfunctional phenol novolac type epoxy resin or halogenated epoxy resin. A compound prepared by adding a curing agent such as imidazole compound or dicyandiamide is used. The characteristic required in the present invention is the durability of the film during cutting or brushing. Therefore, 20-50% by weight of an inorganic pigment is blended as the powder epoxy resin powder coating.
無機顔料はシリカ、酸化チタン、ウォラストナイト、マイカ、タルク、カオリン、酸化クロム、ホウ酸亜鉛、燐酸亜鉛等の顔料、もしくは亜鉛、Al等の金属粉、あるいはセラミック粉等を適宜用いることができる。また、膜の硬度は耐切削性・耐ブラシ加工性には重要であるから、塗膜の硬度を上げるために高いガラス転移温度を持った材料を使用する。具体的にはガラス転移温度としては95℃以上になることが好ましい。 As the inorganic pigment, a pigment such as silica, titanium oxide, wollastonite, mica, talc, kaolin, chromium oxide, zinc borate, and zinc phosphate, metal powder such as zinc and Al, ceramic powder, and the like can be used as appropriate. . Also, since the hardness of the film is important for cutting resistance and brushing resistance, a material having a high glass transition temperature is used to increase the hardness of the coating film. Specifically, the glass transition temperature is preferably 95 ° C. or higher.
粉体エポキシ樹脂塗料は、国内では日本ペイント株式会社、もしくは関西ペイント株式会社から入手可能で、本発明に該当するものを選択して用いる。プライマー層の厚みは150μm以上であれば良いが、厚みが厚くなりすぎると塗膜の内部応力が増加し、昼夜又は季節の移り変わりによる冷熱繰り返しで応力が加わる場合、特に屋外での曝露で剥離し易くなることから150〜600μmが適切である。 The powder epoxy resin paint is available from Nippon Paint Co., Ltd. or Kansai Paint Co., Ltd. in Japan, and the one corresponding to the present invention is selected and used. The thickness of the primer layer should be 150 μm or more, but if the thickness is too thick, the internal stress of the coating will increase, and if stress is applied by repeated cooling and heating due to day and night or changing seasons, it will peel off especially when exposed outdoors. Since it becomes easy, 150-600 micrometers is suitable.
粉体エポキシ樹脂プライマー層5を形成後に、変性ポリオレフィン樹脂接着剤層3を介してポリオレフィン樹脂層4を積層する。変性ポリオレフィン樹脂接着剤は、ポリオレフィン樹脂を無水マレイン酸で変性したもの、あるいはポリオレフィンと無水マレイン酸との共重合体、ポリオレフィンとアクリル酸エステルと、無水マレイン酸との共重合体を用いることができる。 After forming the powder epoxy resin primer layer 5, the polyolefin resin layer 4 is laminated via the modified polyolefin resin adhesive layer 3. As the modified polyolefin resin adhesive, a polyolefin resin modified with maleic anhydride, a copolymer of polyolefin and maleic anhydride, or a copolymer of polyolefin, acrylic ester and maleic anhydride can be used. .
変性ポリオレフィン樹脂接着剤は、粉体あるいはペレットで供給される。ポリエチレン被覆に使用する接着剤としては、例えば三井化学社製のNE060,NE065,NE080、BOREALIS社製のBorcoat ME0420、Lyondell Basell社製のLucalen G3710E等が使用できる。ペレットの場合、接着剤押出機を用いて加熱溶融した樹脂を、Tダイスを用いてプライマー塗布後の鋼管外面に被覆する。中小径鋼管では丸ダイスを用いる場合もある。その他の方法としては、変性ポリオレフィン樹脂接着剤を粉砕して粉体化し、この粉体を塗布する方法もある。これらの方法により、0.1〜0.4mmの接着剤層を形成する。 The modified polyolefin resin adhesive is supplied as powder or pellets. Examples of the adhesive used for the polyethylene coating include NE060, NE065, NE080 manufactured by Mitsui Chemicals, Borcoat ME0420 manufactured by BOREALIS, Lucalen G3710E manufactured by Lyondell Basell, and the like. In the case of pellets, the outer surface of the steel pipe after primer application is coated with a resin that has been heated and melted using an adhesive extruder using a T die. For small and medium diameter steel pipes, round dies may be used. As another method, there is a method in which the modified polyolefin resin adhesive is pulverized and powdered, and this powder is applied. By these methods, an adhesive layer of 0.1 to 0.4 mm is formed.
変性ポリオレフィン接着剤層3の上に被覆するポリオレフィン樹脂は、鋼管被覆用として市販されているものを使用することができる。代表的なポリオレフィンはポリエチレンであり、その他には高温用にポリプロピレンが用いられる。ポリエチレン樹脂としては鋼管被覆用に用いられる銘柄を使用することができる。例えば、国内では日本ポリエチレン社製のNOVATEC ER002S、海外では BOREALIS社製のBorcoat HE3450、Lyondell Basell社製のLupolen 4552Dなどの、鋼管被覆に要求される長期耐久性を有し、カーボンブラックを添加したものが使用可能である。 As the polyolefin resin to be coated on the modified polyolefin adhesive layer 3, those commercially available for coating a steel pipe can be used. A typical polyolefin is polyethylene, and in addition, polypropylene is used for high temperatures. As the polyethylene resin, a brand used for coating a steel pipe can be used. For example, NOVATEC ER002S manufactured by Japan Polyethylene Co., Ltd., Borcoat HE3450 manufactured by BOREALIS Co., Ltd. Can be used.
ポリプロピレン樹脂としては一般的にはホモポリマーよりも低温特性に優れる共重合体が使用され、耐熱性と耐候性対策として、着色顔料、充填強化剤、酸化防止剤、紫外線吸収剤、ヒンダードアミン系の耐候剤等が添加されたもので、低温靭性と高温使用での耐酸化劣化性を兼ね備えたものであることが好ましい。ポリプロピレン樹脂での着色顔料としてカーボンブラックを用いると、高温で酸化防止剤の効果が消失するため、高性能の被覆鋼管品では用いられない。このため、着色顔料の色としては白色が一般的である。ポリプロピレン樹脂は、例えば国内では日本ポリプロピレンのTX1843B、海外ではBOREALIS社製のBorcoat BB108E-1199、LyondellBasell社製のMoplen Coat EP60R/BIANCOといった鋼管被覆用の樹脂が使用出来る。 Polypropylene resins generally use copolymers with better low-temperature properties than homopolymers, and include color pigments, filling enhancers, antioxidants, UV absorbers, and hindered amine-based weather resistance as measures against heat resistance and weather resistance. It is preferable that an agent or the like is added, and has both low temperature toughness and oxidation deterioration resistance at high temperature use. When carbon black is used as a color pigment in a polypropylene resin, the effect of the antioxidant disappears at a high temperature, so that it is not used in a high performance coated steel pipe product. For this reason, the color of the color pigment is generally white. As the polypropylene resin, for example, TX1843B of Japanese polypropylene in Japan, Borcoat BB108E-1199 manufactured by BOREALIS, and Moplen Coat EP60R / BIANCO manufactured by LyondellBasell can be used overseas.
ポリオレフィン樹脂層4は取り扱い時の疵発生を抑制するため、通常2mm以上被覆される。ポリオレフィン樹脂層は厚い程、耐疵性と防食性に優れるが、厚膜になると内部応力が大きくなるため、6mm以下が望ましい。 The polyolefin resin layer 4 is usually coated with 2 mm or more in order to suppress wrinkling during handling. The thicker the polyolefin resin layer, the better the weather resistance and corrosion resistance. However, the thicker the film, the greater the internal stress, so 6 mm or less is desirable.
以下に図3に示す本発明のテーパー形状を有する管端被覆部と、その延長にプライマー層5を有する管端部構造の形成方法の一例を述べる。3層ポリオレフィン樹脂被覆鋼管を製造した後、図5に示すように鋼管を回転させながら、ポリオレフィン被覆部が斜め(テーパー)になるような角度を持ち、かつ、プライマーと接着剤の界面を切削可能とするために鋼管に対して平行な形状の切削刃8を、表面から内部に押し込んで切削加工を実施する。これにより、ポリオレフィン樹脂被覆部には45度以下の一定の角度を有するテーパー断面を形成し、且つプライマーのみを残す加工が可能である。 An example of a method for forming the tube end structure having the tapered shape of the present invention shown in FIG. 3 and the tube end structure having the primer layer 5 as an extension thereof will be described below. After manufacturing a three-layer polyolefin resin-coated steel pipe, the interface between the primer and adhesive can be cut while the steel pipe is rotated as shown in FIG. In order to achieve this, the cutting blade 8 having a shape parallel to the steel pipe is pushed into the inside from the surface to perform cutting. Thereby, it is possible to form a tapered cross section having a constant angle of 45 degrees or less in the polyolefin resin coating portion and leave only the primer.
次いで、図6に示すように回転ワイヤーブラシ9によって被覆を完全に削りとって、管端部から100mm以上の鋼管露出部(カットバック)を形成する。一般的なカットバックの場合、150mmを確保する。最後に図3で形成した延長部のプライマー層の上に接着剤が残存していると現地防食との接着性を阻害するので、必要に応じて、プライマー面をワイヤーブラシ等で研磨して残存接着剤をはぎ取って仕上げる。 Next, as shown in FIG. 6, the coating is completely scraped off by the rotating wire brush 9 to form a steel pipe exposed portion (cutback) of 100 mm or more from the pipe end. In the case of a general cutback, 150 mm is secured. Finally, if adhesive remains on the primer layer of the extension formed in Fig. 3, the adhesion with the local anticorrosion is inhibited, so the primer surface is polished with a wire brush or the like as necessary. Remove the adhesive and finish.
プライマー単層部分はパイプラインの供用中に水の侵入がポリオレフィン被覆部まで到達しない距離があれば良く、最低でも5mmの延長が必要である。また最大長さに特に制約は無いが、長すぎると加工が困難であることと、カットバック距離との関係にもよるが被覆端部の鋼材露出部を標準の150mmとすると、プライマーを50mm以上延長すると現地溶接時に溶接の熱影響を受けやすい100mm以内(溶接部からの距離)となってしまうことから50mmまでとし、5〜50mmを適切な範囲とした。 The primer single layer portion needs to have a distance that prevents water from entering the polyolefin coating portion during service of the pipeline, and it is necessary to extend it by at least 5 mm. There is no particular restriction on the maximum length, but if it is too long, processing is difficult, and depending on the relationship with the cutback distance, if the steel exposed part at the coated end is standard 150 mm, the primer should be 50 mm or more When it is extended, it is within 100 mm (distance from the welded portion) that is easily affected by the heat of welding during field welding.
〔実施例1〜5〕
以下、本発明のポリオレフィンにポリエチレンを使用し、テーパー角度、プライマーの塗装厚みを変えた実施例1〜5を具体的に説明する。
鋼管は200AのJIS G3452の配管用炭素鋼管5.5m長を用いた。鋼管外面にIKK社製のTGD−70番のグリッドブラスト処理を行って除錆したものを用意した。その後、鋼管の表面洗浄処理を行って汚れや鉄粉等を除去した。
鋼管を加熱装置で220℃に加熱後、粉体エポキシ樹脂プライマー(BASEPOX PE50-1081、Arsonsisi社製、顔料添加量27%、ガラス転移温度102℃)を、本発明の膜厚範囲である150〜600μmで静電粉体塗装を実施した後にポリエチレン接着剤として三井化学社製のNE065のペレットを押出機とTダイスを用いてシート状の半溶融状態に成形して巻き付け被覆を行った。次いで、ポリエチレン被覆には日本ポリエチレン社製のNOVATEC ER002Sのペレットを押出機とTダイスを用いてシート状の半溶融状態に成形して巻き付け被覆を行った。接着剤膜厚は0.2mm、ポリエチレン樹脂被覆は3mmになるように調整した。被覆後、水冷を行って3層ポリエチレン樹脂被覆鋼管を製造した。
[Examples 1 to 5]
Hereinafter, Examples 1 to 5 in which polyethylene is used for the polyolefin of the present invention and the taper angle and the primer coating thickness are changed will be specifically described.
As the steel pipe, a 5.5A length of 200A JIS G3452 piping carbon steel pipe was used. The outer surface of the steel pipe was subjected to IGD's TGD-70 grid blasting treatment to remove the rust. Thereafter, the steel pipe was subjected to a surface cleaning treatment to remove dirt, iron powder, and the like.
After heating the steel pipe to 220 ° C. with a heating device, a powder epoxy resin primer (BASEPOX PE50-1081, manufactured by Arsonsisi, pigment addition amount 27%, glass transition temperature 102 ° C.) is a film thickness range of 150 to 150 of the present invention. After carrying out electrostatic powder coating at 600 μm, NE065 pellets manufactured by Mitsui Chemicals Co., Ltd. as a polyethylene adhesive were formed into a sheet-like semi-molten state using an extruder and a T-die, and coated by wrapping. Subsequently, NOVATEC ER002S pellets manufactured by Nippon Polyethylene Co., Ltd. were formed into a sheet-like semi-molten state by using an extruder and a T die, and the polyethylene coating was wound and coated. The adhesive film thickness was adjusted to 0.2 mm, and the polyethylene resin coating was adjusted to 3 mm. After coating, water cooling was performed to produce a three-layer polyethylene resin-coated steel pipe.
作製した3層ポリエチレン樹脂被覆鋼管を回転させ、角度を持った刃と鋼管に平行な刃を兼ね備えた切削刃によってテーパー加工と、延長プライマー層を形成するための接着剤とポリエチレン樹脂被覆の切削加工とを同時に行った。テーパー加工の角度は本発明の範囲となる30度と45度の角度を選定した。この時、ポリエチレン樹脂の被覆端部は鋼管の端部から150mmの位置になるように調整した。その後ワイヤーブラシを用いて鋼管端部から被覆を削り取って鋼面を露出させ、プライマー単層部分を20mmの長さで残存させた。プライマー単層部分についてはワイヤーブラシで表面のみを更に研削し、接着剤が表面に残存しないように仕上げ、実施例1〜5を製造した。 The produced three-layer polyethylene resin-coated steel pipe is rotated and tapered by a cutting blade having an angled blade and a blade parallel to the steel pipe, and cutting of adhesive and polyethylene resin coating to form an extended primer layer And went at the same time. The angles of the taper processing were selected to be 30 ° and 45 ° within the range of the present invention. At this time, the coated end of the polyethylene resin was adjusted to be 150 mm from the end of the steel pipe. Thereafter, the coating was scraped off from the end of the steel pipe using a wire brush to expose the steel surface, and the primer single layer portion was left with a length of 20 mm. About the primer single layer part, only the surface was further ground with a wire brush and finished so that no adhesive remained on the surface, and Examples 1 to 5 were produced.
〔実施例6〜8〕
以下、本発明のポリオレフィンにポリプロピレンを使い、プライマー延長部の長さを変えた場合の実施例6〜8を具体的に説明する。
鋼管は200AのJIS G3452の配管用炭素鋼管5.5m長を用いた。鋼管外面にIKK社製のTGD−70番のグリッドブラスト処理を行って除錆したものを用意した。その後、鋼管の表面洗浄処理を行って汚れや鉄粉等を除去した。
鋼管を加熱装置で220℃に加熱後、粉体エポキシ樹脂プライマー(Scotchkote 226N+、3M社製、顔料添加量44%、ガラス転移温度106℃)を、本発明の膜厚範囲である300μmで静電粉体塗装を実施した後に接着剤として三菱化学のAP−P501のペレットを押出機とTダイスを用いてシート状の半溶融状態に成形して巻き付け被覆を行った。次いで、ポリプロピレン被覆には日本ポリプロピレンのTX1843Bのペレットを押出機とTダイスを用いてシート状の半溶融状態に成形して巻き付け被覆を行った。接着剤膜厚は0.2mm、ポリプロピレン樹脂被覆は3mmになるように調整した。被覆後、水冷を行って3層ポリプロピレン樹脂被覆鋼管を製造した。
[Examples 6 to 8]
Examples 6 to 8 in the case where polypropylene is used for the polyolefin of the present invention and the length of the primer extension portion is changed will be specifically described below.
As the steel pipe, a 5.5A length of 200A JIS G3452 piping carbon steel pipe was used. The outer surface of the steel pipe was subjected to IGD's TGD-70 grid blasting treatment to remove the rust. Thereafter, the steel pipe was subjected to a surface cleaning treatment to remove dirt, iron powder, and the like.
After heating the steel tube to 220 ° C. with a heating device, a powder epoxy resin primer (Scotchkote 226N +, 3M, 44% pigment addition, 106 ° C. glass transition temperature) is electrostatically applied at a film thickness range of 300 μm of the present invention. After powder coating, pellets of Mitsubishi Chemical AP-P501 were formed into a sheet-like semi-molten state using an extruder and a T-die as an adhesive, and were wound and covered. Next, for the polypropylene coating, pellets of Japanese polypropylene TX1843B were formed into a sheet-like semi-molten state using an extruder and a T-die, and then wound and coated. The adhesive film thickness was adjusted to 0.2 mm, and the polypropylene resin coating was adjusted to 3 mm. After coating, water cooling was performed to produce a three-layer polypropylene resin-coated steel pipe.
作製した3層ポリプロピレン樹脂被覆鋼管を回転させ、角度を持った刃と鋼管に平行な刃を兼ね備えた切削刃によってテーパー加工と、延長プライマー層を形成するための接着剤とポリエチレン樹脂被覆の切削加工とを同時に行った。テーパー加工の角度は本発明の範囲となる45度の角度を選定した。この時、ポリプロピレン樹脂の被覆端部は鋼管の端部から150mmの位置になるように調整した。その後ワイヤーブラシを用いて鋼管端部から被覆を削り取って鋼面を露出させ、プライマー単層部分を調整して本発明の範囲である5〜50mm長さで残存させた。プライマー単層部分についてはワイヤーブラシで表面のみを更に研削し、接着剤が表面に残存しないように仕上げ、実施例6〜8を製造した。 The produced three-layer polypropylene resin-coated steel pipe is rotated and tapered by a cutting blade having an angled blade and a blade parallel to the steel pipe, and an adhesive and polyethylene resin-coated cutting for forming an extended primer layer And went at the same time. The taper processing angle was selected to be 45 degrees within the range of the present invention. At this time, the coated end of the polypropylene resin was adjusted to be 150 mm from the end of the steel pipe. Thereafter, the coating was scraped off from the end of the steel pipe using a wire brush to expose the steel surface, and the primer single layer portion was adjusted to remain at a length of 5 to 50 mm which is the range of the present invention. About the primer single layer part, only the surface was further ground with a wire brush and finished so that no adhesive remained on the surface, and Examples 6 to 8 were produced.
〔比較例1〜3〕
以下、本発明のポリオレフィンにポリエチレンを使用し、テーパーの無い場合を比較例1、プライマー単層部が無いか又は小さい場合を比較例2及び3として具体的に説明する。
鋼管は200AのJIS G3452の配管用炭素鋼管5.5m長を用いた。鋼管外面にIKK社製のTGD−70番のグリッドブラスト処理を行って除錆したものを用意した。その後。鋼管の表面洗浄処理を行って汚れや鉄粉等を除去した。
鋼管を加熱装置で220℃に加熱後、粉体エポキシ樹脂プライマー(BASEPOX PE50-1081、Arsonsisi社製、顔料添加量27%、ガラス転移温度102℃)を、本発明の膜厚範囲である150μmで静電粉体塗装を実施した後にポリエチレン接着剤として三井化学社製のNE065のペレットを押出機とTダイスを用いてシート状の半溶融状態に成形して巻き付け被覆を行った。次いで、ポリエチレン被覆には日本ポリエチレン社製のNOVATEC ER002Sのペレットを押出機とTダイスを用いてシート状の半溶融状態に成形して巻き付け被覆を行った。接着剤膜厚は0.2mm、ポリエチレン樹脂被覆は3mmになるように調整した。被覆後、水冷を行って3層ポリエチレン樹脂被覆鋼管を製造した。
[Comparative Examples 1-3]
Hereinafter, the case where polyethylene is used for the polyolefin of the present invention and there is no taper will be specifically described as Comparative Example 1, and the case where the primer single layer portion is absent or small is referred to as Comparative Examples 2 and 3.
As the steel pipe, a 5.5A length of 200A JIS G3452 piping carbon steel pipe was used. The outer surface of the steel pipe was subjected to IGD's TGD-70 grid blasting treatment to remove the rust. after that. The surface of the steel pipe was cleaned to remove dirt and iron powder.
After heating the steel tube to 220 ° C. with a heating device, a powder epoxy resin primer (BASEPOX PE50-1081, manufactured by Arsonsisi, 27% pigment addition, glass transition temperature 102 ° C.) was used in the film thickness range of 150 μm of the present invention. After performing electrostatic powder coating, pellets of NE065 manufactured by Mitsui Chemicals Co., Ltd. as a polyethylene adhesive were formed into a sheet-like semi-molten state using an extruder and a T-die, and were wound and coated. Subsequently, NOVATEC ER002S pellets manufactured by Nippon Polyethylene Co., Ltd. were formed into a sheet-like semi-molten state by using an extruder and a T die, and the polyethylene coating was wound and coated. The adhesive film thickness was adjusted to 0.2 mm, and the polyethylene resin coating was adjusted to 3 mm. After coating, water cooling was performed to produce a three-layer polyethylene resin-coated steel pipe.
〔比較例1〕
作製した3層ポリエチレン樹脂被覆鋼管を回転させ、90度の角度を持った刃と鋼管に平行な刃を兼ね備えた切削刃による加工と、延長プライマー層を形成するための接着剤とポリエチレン樹脂被覆の切削加工とを同時に行った。この時、ポリエチレン樹脂の被覆端部は鋼管の端部から150mmの位置になるように調整した。その後ワイヤーブラシを用いて鋼管端部から被覆を削り取って鋼面を露出させ、プライマー単層部分を5mmの長さで残存させた。プライマー単層部分についてはワイヤーブラシで表面のみを更に研削し、接着剤が表面に残存しないように仕上げ、比較例1を製造した。
[Comparative Example 1]
The produced three-layer polyethylene resin-coated steel pipe is rotated and processed with a cutting blade having a blade having a 90-degree angle and a blade parallel to the steel pipe, and an adhesive and polyethylene resin-coated for forming an extended primer layer. Cutting was performed at the same time. At this time, the coated end of the polyethylene resin was adjusted to be 150 mm from the end of the steel pipe. Thereafter, the coating was scraped off from the end of the steel pipe using a wire brush to expose the steel surface, and the primer single layer portion was left with a length of 5 mm. About the primer single layer part, only the surface was further ground with a wire brush and finished so that no adhesive remained on the surface, and Comparative Example 1 was produced.
〔比較例2〕
作製した3層ポリエチレン樹脂被覆鋼管を回転させ、45度の角度を持った刃と鋼管に平行な刃を兼ね備えた切削刃によってテーパー加工と、延長プライマー層を形成するための接着剤とポリエチレン樹脂被覆の切削加工とを同時に行った。テーパー加工の角度は本発明の範囲となる45度の角度を選定した。この時、ポリエチレン樹脂の被覆端部は鋼管の端部から150mmの位置になるように調整した。その後ワイヤーブラシを用いて鋼管端部から被覆を削り取って鋼面を露出させ、プライマー単層部分を残さない(0mm)ようにして比較例2を製造した。
[Comparative Example 2]
The produced three-layer polyethylene resin-coated steel pipe is rotated and tapered with a cutting blade having a 45-degree angle blade and a blade parallel to the steel pipe, and an adhesive and a polyethylene resin coating for forming an extended primer layer The cutting process was performed simultaneously. The taper processing angle was selected to be 45 degrees within the range of the present invention. At this time, the coated end of the polyethylene resin was adjusted to be 150 mm from the end of the steel pipe. Thereafter, the coating was scraped off from the end of the steel pipe using a wire brush to expose the steel surface, and Comparative Example 2 was produced so as not to leave the primer single layer portion (0 mm).
〔比較例3〕
作製した3層ポリエチレン樹脂被覆鋼管を回転させ、45度の角度を持った刃と鋼管に平行な刃を兼ね備えた切削刃によってテーパー加工と、延長プライマー層を形成するための接着剤とポリエチレン樹脂被覆の切削加工とを同時に行った。この時、ポリエチレン樹脂の被覆端部は鋼管の端部から150mmの位置になるように調整した。その後ワイヤーブラシを用いて鋼管端部から被覆を削り取って鋼面を露出させ、プライマー単層部分を2mmの長さで残存させて比較例3を製造した。
[Comparative Example 3]
The produced three-layer polyethylene resin-coated steel pipe is rotated and tapered with a cutting blade having a 45-degree angle blade and a blade parallel to the steel pipe, and an adhesive and a polyethylene resin coating for forming an extended primer layer The cutting process was performed simultaneously. At this time, the coated end of the polyethylene resin was adjusted to be 150 mm from the end of the steel pipe. Thereafter, the coating was scraped from the end of the steel pipe using a wire brush to expose the steel surface, and the primer single layer portion was left with a length of 2 mm to produce Comparative Example 3.
〔比較例4〕
以下、本発明のポリオレフィンにポリエチレンを使用し、プライマー部分の厚みが異なる場合として具体的に説明する。
鋼管は200AのJIS G3452の配管用炭素鋼管5.5m長を用いた。鋼管外面にIKK社製のTGD−70番のグリッドブラスト処理を行って除錆したものを用意した。その後、鋼管の表面洗浄処理を行って汚れや鉄粉等を除去した。
鋼管を加熱装置で220℃に加熱後、粉体エポキシ樹脂プライマー(BASEPOX PE50-1081、Arsonsisi社製、顔料添加量27%、ガラス転移温度102℃)を、本発明の膜厚範囲から外れる100μmで静電粉体塗装を実施した後にポリエチレン接着剤として三井化学社製のNE065のペレットを押出機とTダイスを用いてシート状の半溶融状態に成形して巻き付け被覆を行った。次いで、ポリエチレン被覆には日本ポリエチレン社製のNOVATEC ER002Sのペレットを押出機とTダイスを用いてシート状の半溶融状態に成形して巻き付け被覆を行った。接着剤膜厚は0.2mm、ポリエチレン樹脂被覆は3mmになるように調整した。被覆後、水冷を行って3層ポリエチレン樹脂被覆鋼管を製造した。
[Comparative Example 4]
Hereinafter, the case where polyethylene is used for the polyolefin of the present invention and the primer portions have different thicknesses will be specifically described.
As the steel pipe, a 5.5A length of 200A JIS G3452 piping carbon steel pipe was used. The outer surface of the steel pipe was subjected to IGD's TGD-70 grid blasting treatment to remove the rust. Thereafter, the steel pipe was subjected to a surface cleaning treatment to remove dirt, iron powder, and the like.
After heating the steel tube to 220 ° C. with a heating device, a powder epoxy resin primer (BASEPOX PE50-1081, manufactured by Arsonsisi, 27% pigment addition, glass transition temperature 102 ° C.) is 100 μm outside the film thickness range of the present invention. After performing electrostatic powder coating, pellets of NE065 manufactured by Mitsui Chemicals Co., Ltd. as a polyethylene adhesive were formed into a sheet-like semi-molten state using an extruder and a T-die, and were wound and coated. Subsequently, NOVATEC ER002S pellets manufactured by Nippon Polyethylene Co., Ltd. were formed into a sheet-like semi-molten state by using an extruder and a T die, and the polyethylene coating was wound and coated. The adhesive film thickness was adjusted to 0.2 mm, and the polyethylene resin coating was adjusted to 3 mm. After coating, water cooling was performed to produce a three-layer polyethylene resin-coated steel pipe.
作製した3層ポリエチレン樹脂被覆鋼管を回転させ、45度の角度を持った刃と鋼管に平行な刃を兼ね備えた切削刃によってテーパー加工と、延長プライマー層を形成するための接着剤とポリエチレン樹脂被覆の切削加工とを同時に行った。この時、ポリオレフィン樹脂の被覆端部は鋼管の端部から150mmの位置になるように調整した。その後ワイヤーブラシを用いて鋼管端部から被覆を削り取って鋼面を露出させ、プライマー単層部分を4mmの長さで残存させて比較例4を製造した。 The produced three-layer polyethylene resin-coated steel pipe is rotated and tapered with a cutting blade having a 45-degree angle blade and a blade parallel to the steel pipe, and an adhesive and a polyethylene resin coating for forming an extended primer layer The cutting process was performed simultaneously. At this time, the coated end portion of the polyolefin resin was adjusted to be 150 mm from the end portion of the steel pipe. Thereafter, the coating was scraped off from the end of the steel pipe using a wire brush to expose the steel surface, and the primer single layer portion was left with a length of 4 mm to produce Comparative Example 4.
〔比較例5〕
以下、本発明のポリオレフィンにポリエチレンを使用し、プライマー部分のガラス転移温度が不足した場合として具体的に説明する。
鋼管は200AのJIS G3452の配管用炭素鋼管5.5m長を用いた。鋼管外面にIKK社製のTGD−70番のグリッドブラスト処理を行って除錆したものを用意した。その後、鋼管の表面洗浄処理を行って汚れや鉄粉等を除去した。
鋼管を加熱装置で220℃に加熱後、粉体エポキシ樹脂プライマー(国内試作品、顔料添加量25%、ガラス転移温度91℃)を、本発明の膜厚範囲の150μmで静電粉体塗装を実施した後にポリエチレン接着剤として三井化学社製のNE065のペレットを押出機とTダイスを用いてシート状の半溶融状態に成形して巻き付け被覆を行った。次いで、ポリエチレン被覆には日本ポリエチレン社製のNOVATEC ER002Sのペレットを押出機とTダイスを用いてシート状の半溶融状態に成形して巻き付け被覆を行った。接着剤膜厚は0.2mm、ポリエチレン樹脂被覆は3mmになるように調整した。被覆後、水冷を行って3層ポリエチエン樹脂被覆鋼管を製造した。
[Comparative Example 5]
Hereinafter, the case where polyethylene is used for the polyolefin of the present invention and the glass transition temperature of the primer portion is insufficient will be specifically described.
As the steel pipe, a 5.5A length of 200A JIS G3452 piping carbon steel pipe was used. The outer surface of the steel pipe was subjected to IGD's TGD-70 grid blasting treatment to remove the rust. Thereafter, the steel pipe was subjected to a surface cleaning treatment to remove dirt, iron powder, and the like.
After heating the steel tube to 220 ° C with a heating device, apply the powder epoxy resin primer (domestic prototype, pigment addition amount 25%, glass transition temperature 91 ° C) with electrostatic powder coating at 150 µm in the film thickness range of the present invention. After implementation, NE065 pellets manufactured by Mitsui Chemicals, Inc. as polyethylene adhesive were formed into a sheet-like semi-molten state using an extruder and a T-die, and were wound and covered. Subsequently, NOVATEC ER002S pellets manufactured by Nippon Polyethylene Co., Ltd. were formed into a sheet-like semi-molten state by using an extruder and a T die, and the polyethylene coating was wound and coated. The adhesive film thickness was adjusted to 0.2 mm, and the polyethylene resin coating was adjusted to 3 mm. After coating, water cooling was performed to produce a three-layer polyethylene resin-coated steel pipe.
作製した3層ポリエチレン樹脂被覆鋼管を回転させ、45度の角度を持った刃と鋼管に平行な刃を兼ね備えた切削刃によってテーパー加工と、延長プライマー層を形成するための接着剤とポリエチレン樹脂被覆の切削加工とを同時に行った。この時、ポリエチレン樹脂の被覆端部は鋼管の端部から150mmの位置になるように調整した。その後ワイヤーブラシを用いて鋼管端部から被覆を削り取って鋼面を露出させ、プライマー単層部分を4mmの長さで残存させて比較例5を製造した。 The produced three-layer polyethylene resin-coated steel pipe is rotated and tapered with a cutting blade having a 45-degree angle blade and a blade parallel to the steel pipe, and an adhesive and a polyethylene resin coating for forming an extended primer layer The cutting process was performed simultaneously. At this time, the coated end of the polyethylene resin was adjusted to be 150 mm from the end of the steel pipe. Thereafter, the coating was scraped off from the end of the steel pipe using a wire brush to expose the steel surface, and the primer single layer portion was left with a length of 4 mm to produce Comparative Example 5.
〔比較例6〕
以下、本発明のポリオレフィンにポリエチレンを使用し、プライマー部分の無機顔料の添加が不足した場合として具体的に説明する。
鋼管は200AのJIS G3452の配管用炭素鋼管5.5m長を用いた。鋼管外面にIKK社製のTGD−70番のグリッドブラスト処理を行って除錆したものを用意した。その後、鋼管の表面洗浄処理を行って汚れや鉄粉等を除去した。
鋼管を加熱装置で220℃に加熱後、粉体エポキシ樹脂プライマー(国内試作品、顔料添加量11%、ガラス転移温度101℃)を、本発明の膜厚範囲の150μmで静電粉体塗装を実施した後にポリエチレン接着剤として三井化学社製のNE065のペレットを押出機とTダイスを用いてシート状の半溶融状態に成形して巻き付け被覆を行った。次いで、ポリエチレン被覆には日本ポリエチレン社製のNOVATEC ER002Sのペレットを押出機とTダイスを用いてシート状の半溶融状態に成形して巻き付け被覆を行った。接着剤膜厚は0.2mm、ポリエチレン樹脂被覆は3mmになるように調整した。被覆後、水冷を行って3層ポリエチレン樹脂被覆鋼管を製造した。
[Comparative Example 6]
Hereinafter, the case where polyethylene is used for the polyolefin of the present invention and the addition of the inorganic pigment in the primer portion is insufficient will be specifically described.
As the steel pipe, a 5.5A length of 200A JIS G3452 piping carbon steel pipe was used. The outer surface of the steel pipe was subjected to IGD's TGD-70 grid blasting treatment to remove the rust. Thereafter, the steel pipe was subjected to a surface cleaning treatment to remove dirt, iron powder, and the like.
After heating the steel tube to 220 ° C with a heating device, apply the powder epoxy resin primer (domestic prototype, pigment addition amount 11%, glass transition temperature 101 ° C) with electrostatic powder coating at the film thickness range of 150μm of the present invention. After implementation, NE065 pellets manufactured by Mitsui Chemicals, Inc. as polyethylene adhesive were formed into a sheet-like semi-molten state using an extruder and a T-die, and were wound and covered. Subsequently, NOVATEC ER002S pellets manufactured by Nippon Polyethylene Co., Ltd. were formed into a sheet-like semi-molten state by using an extruder and a T die, and the polyethylene coating was wound and coated. The adhesive film thickness was adjusted to 0.2 mm, and the polyethylene resin coating was adjusted to 3 mm. After coating, water cooling was performed to produce a three-layer polyethylene resin-coated steel pipe.
作製した3層ポリエチレン樹脂被覆鋼管を回転させ、45度の角度を持った刃と鋼管に平行な刃を兼ね備えた切削刃によってテーパー加工と、延長プライマー層を形成するための接着剤とポリエチレン樹脂被覆の切削加工とを同時に行った。この時、ポリオレフィン樹脂の被覆端部は鋼管の端部から150mmの位置になるように調整した。その後ワイヤーブラシを用いて鋼管端部から被覆を削り取って鋼面を露出させ、プライマー単層部分を4mmの長さで残存させて比較例6を製造した。 The produced three-layer polyethylene resin-coated steel pipe is rotated and tapered with a cutting blade having a 45-degree angle blade and a blade parallel to the steel pipe, and an adhesive and a polyethylene resin coating for forming an extended primer layer The cutting process was performed simultaneously. At this time, the coated end portion of the polyolefin resin was adjusted to be 150 mm from the end portion of the steel pipe. Thereafter, the coating was scraped off from the end of the steel pipe using a wire brush to expose the steel surface, and the primer single layer portion was left with a length of 4 mm to produce Comparative Example 6.
〔実施例、比較例の性能試験結果〕
前記方法で製造した実施例及び比較例の、鋼管の端部仕様の違いと腐食による耐剥離性との関係を確認するため、管端部から500mm長さで切断して屋外に1年間曝露した後、ポリオレフィン被覆端部から被覆をはつって、円周上の8点の剥離長さを測定して平均剥離長さを求めた。
また、現地防食被覆における防食性を評価するため、同様に管端部から500mm長さに鋼管を切断後、これらの鋼管を円周溶接し接合した。その後、現地防食収縮スリーブの内層6、現地防食収縮スリーブの外層7からなるポリエチレン樹脂製収縮スリーブにて現地防食被覆を実施し、腐食評価用の模擬現地継ぎ手部を作製した。現地継ぎ手部の防食性については、促進試験として80℃の塩水に90日間試験体を浸漬した後、継ぎ手部の現地防食被覆を除去しさらに上記と同様にポリオレフィン被覆端部から被覆をはつって、円周上の8点の剥離長さを測定して平均剥離長さを求めた。
[Performance test results of Examples and Comparative Examples]
In order to confirm the relationship between the difference in the end specification of the steel pipe and the peeling resistance due to corrosion in the examples and comparative examples manufactured by the above method, the pipe end was cut at a length of 500 mm and exposed outdoors for one year. Thereafter, the coating was peeled from the polyolefin coating end, and the peeling length at 8 points on the circumference was measured to obtain the average peeling length.
Moreover, in order to evaluate the anticorrosion property in the local anticorrosion coating, the steel pipes were similarly cut to a length of 500 mm from the pipe end portions, and these steel pipes were circumferentially welded and joined. Thereafter, a local anticorrosion coating was carried out using a polyethylene resin shrink sleeve comprising an inner layer 6 of the local anticorrosion shrink sleeve and an outer layer 7 of the local anticorrosion shrink sleeve, and a simulated local joint portion for corrosion evaluation was produced. As for the corrosion resistance of the local joint part, after immersing the specimen for 90 days in salt water at 80 ° C. as an accelerated test, the local anticorrosion coating on the joint part is removed and the coating is applied from the polyolefin coating end as described above. The average peel length was determined by measuring the peel length at 8 points on the circumference.
上記試験結果について実施例、比較例を表1にまとめた。
表1の本発明の実施例の結果からも明らかな様に、ポリオレフィン被覆にテーパー形状加工を行い、その先端にプライマー層のみを残存させた本発明では、被覆の端部の剥離応力が小さいだけで無く、腐食剥離も残存プライマーによって抑制されることから、屋外に1年間曝露しても剥離を生じない。更に、現地防食が2層被覆であっても、プライマーが残存することによって3層となる部分が円周状の両端に出来ることから、腐食因子である水やイオンが鋼材と現地被覆の接着界面に到達しづらいため、促進試験においてもポリオレフィン被覆の端部剥離が発生しなかった。
About the said test result, the Example and the comparative example were put together in Table 1.
As is apparent from the results of Examples of the present invention shown in Table 1, in the present invention in which the polyolefin coating is tapered and only the primer layer is left at the tip, the peeling stress at the end of the coating is small. Moreover, since corrosion peeling is also suppressed by the remaining primer, peeling does not occur even if exposed to the outdoors for one year. Furthermore, even if the local anticorrosion is a two-layer coating, the three-layered part can be formed at both ends of the circumference by the primer remaining, so that water and ions, which are corrosion factors, are bonded to the steel material and the local coating. As a result, it was difficult to reach the end of the polyolefin coating even in the accelerated test.
一方、ポリオレフィン被覆端部がテーパー形状を有しない比較例1の場合には、剥離応力が端部に集中することと、現地防食が角部に十分になじまないといった問題から、防食性に問題が生じる。比較例2及び3のように、本発明に必要なプライマー残存長さが不十分であった場合、屋外曝露では腐食剥離、現地防食では管端シール効果が不十分となって剥離が生じる。
また比較例4〜6の様にプライマーに必要な膜厚や、加工による耐切削性・耐ブラシ加工性(ガラス転移温度及び無機顔料添加量)等が不足すると、プライマー残存部の防食性が低下し、結果としてポリオレフィン被覆の端部剥離が発生する。
On the other hand, in the case of Comparative Example 1 in which the polyolefin-coated end portion does not have a taper shape, there is a problem in the anticorrosion property because the peeling stress is concentrated on the end portion and the local anticorrosion is not sufficiently adapted to the corner portion. Arise. As in Comparative Examples 2 and 3, when the remaining primer length necessary for the present invention is insufficient, corrosion peeling occurs when exposed outdoors, and the pipe end sealing effect is insufficient when exposed to local corrosion, resulting in peeling.
In addition, if the film thickness required for the primer and the cutting resistance and brushing resistance (glass transition temperature and added amount of inorganic pigment) due to processing are insufficient as in Comparative Examples 4 to 6, the corrosion resistance of the remaining primer portion decreases. As a result, end peeling of the polyolefin coating occurs.
以上の結果からも明らかなように、3層ポリオレフィン樹脂被覆鋼管において既存のカットバックとテーパーのみによる端部の被覆仕様では、置き場曝露と、現地被覆を行った後の防食性が十分では無かった。これに対して、本発明のプライマー部を残存させる加工を行う被覆の端部仕様では、屋外曝露で問題となる冷熱繰り返しによる剥離応力が小さく、防食性の高いプライマー部が延長被覆されていることから、曝露によってポリオレフィン被覆端部の剥離が開始する事が無く、更に現地防食においてはシール効果が高いために現地防食部の防食性を大きく向上させることが可能である。 As is clear from the above results, in the existing three-layer polyolefin resin-coated steel pipe, the end cover specifications using only the cutback and taper were not sufficient for exposure to storage and anticorrosion after field coating. . On the other hand, in the end specification of the coating that performs the processing to leave the primer portion of the present invention, the peeling stress due to repeated cooling and heating, which is a problem in outdoor exposure, is small, and the primer portion having high anticorrosion properties is extendedly coated. Therefore, the peeling of the polyolefin coating end does not start due to exposure, and the anticorrosion property of the local anticorrosion part can be greatly improved because the sealing effect is high in the local anticorrosion.
1 鋼管
2 プライマー層
3 接着剤層
4 ポリオレフィン樹脂層
5 延長被覆された粉体エポキシ樹脂塗装によるプライマー層
6 現地防食収縮スリーブの内層
7 現地防食収縮スリーブの外層
8 被覆端部のテーパー加工とプライマー残存部上の被覆を切削除去する形状の切削刃
9 回転ワイヤーブラシ
DESCRIPTION OF SYMBOLS 1 Steel pipe 2 Primer layer 3 Adhesive layer 4 Polyolefin resin layer 5 Primer layer by powder epoxy resin coating with extended coating 6 Inner layer of local anticorrosion shrink sleeve 7 Outer layer of local anticorrosion shrink sleeve 8 Taper processing of coated end and primer remaining Cutting blade 9 shaped to remove the coating on the part 9 Rotating wire brush
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